diff options
Diffstat (limited to 'drivers/scsi/pmcraid.c')
| -rw-r--r-- | drivers/scsi/pmcraid.c | 5604 |
1 files changed, 5604 insertions, 0 deletions
diff --git a/drivers/scsi/pmcraid.c b/drivers/scsi/pmcraid.c new file mode 100644 index 00000000000..4302f06e4ec --- /dev/null +++ b/drivers/scsi/pmcraid.c @@ -0,0 +1,5604 @@ +/* + * pmcraid.c -- driver for PMC Sierra MaxRAID controller adapters + * + * Written By: PMC Sierra Corporation + * + * Copyright (C) 2008, 2009 PMC Sierra Inc + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, + * USA + * + */ +#include <linux/fs.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/ioport.h> +#include <linux/delay.h> +#include <linux/pci.h> +#include <linux/wait.h> +#include <linux/spinlock.h> +#include <linux/sched.h> +#include <linux/interrupt.h> +#include <linux/blkdev.h> +#include <linux/firmware.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/hdreg.h> +#include <linux/version.h> +#include <linux/io.h> +#include <asm/irq.h> +#include <asm/processor.h> +#include <linux/libata.h> +#include <linux/mutex.h> +#include <scsi/scsi.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_tcq.h> +#include <scsi/scsi_eh.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsicam.h> + +#include "pmcraid.h" + +/* + * Module configuration parameters + */ +static unsigned int pmcraid_debug_log; +static unsigned int pmcraid_disable_aen; +static unsigned int pmcraid_log_level = IOASC_LOG_LEVEL_MUST; + +/* + * Data structures to support multiple adapters by the LLD. + * pmcraid_adapter_count - count of configured adapters + */ +static atomic_t pmcraid_adapter_count = ATOMIC_INIT(0); + +/* + * Supporting user-level control interface through IOCTL commands. + * pmcraid_major - major number to use + * pmcraid_minor - minor number(s) to use + */ +static unsigned int pmcraid_major; +static struct class *pmcraid_class; +DECLARE_BITMAP(pmcraid_minor, PMCRAID_MAX_ADAPTERS); + +/* + * Module parameters + */ +MODULE_AUTHOR("PMC Sierra Corporation, anil_ravindranath@pmc-sierra.com"); +MODULE_DESCRIPTION("PMC Sierra MaxRAID Controller Driver"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(PMCRAID_DRIVER_VERSION); + +module_param_named(log_level, pmcraid_log_level, uint, (S_IRUGO | S_IWUSR)); +MODULE_PARM_DESC(log_level, + "Enables firmware error code logging, default :1 high-severity" + " errors, 2: all errors including high-severity errors," + " 0: disables logging"); + +module_param_named(debug, pmcraid_debug_log, uint, (S_IRUGO | S_IWUSR)); +MODULE_PARM_DESC(debug, + "Enable driver verbose message logging. Set 1 to enable." + "(default: 0)"); + +module_param_named(disable_aen, pmcraid_disable_aen, uint, (S_IRUGO | S_IWUSR)); +MODULE_PARM_DESC(disable_aen, + "Disable driver aen notifications to apps. Set 1 to disable." + "(default: 0)"); + +/* chip specific constants for PMC MaxRAID controllers (same for + * 0x5220 and 0x8010 + */ +static struct pmcraid_chip_details pmcraid_chip_cfg[] = { + { + .ioastatus = 0x0, + .ioarrin = 0x00040, + .mailbox = 0x7FC30, + .global_intr_mask = 0x00034, + .ioa_host_intr = 0x0009C, + .ioa_host_intr_clr = 0x000A0, + .ioa_host_mask = 0x7FC28, + .ioa_host_mask_clr = 0x7FC28, + .host_ioa_intr = 0x00020, + .host_ioa_intr_clr = 0x00020, + .transop_timeout = 300 + } +}; + +/* + * PCI device ids supported by pmcraid driver + */ +static struct pci_device_id pmcraid_pci_table[] __devinitdata = { + { PCI_DEVICE(PCI_VENDOR_ID_PMC, PCI_DEVICE_ID_PMC_MAXRAID), + 0, 0, (kernel_ulong_t)&pmcraid_chip_cfg[0] + }, + {} +}; + +MODULE_DEVICE_TABLE(pci, pmcraid_pci_table); + + + +/** + * pmcraid_slave_alloc - Prepare for commands to a device + * @scsi_dev: scsi device struct + * + * This function is called by mid-layer prior to sending any command to the new + * device. Stores resource entry details of the device in scsi_device struct. + * Queuecommand uses the resource handle and other details to fill up IOARCB + * while sending commands to the device. + * + * Return value: + * 0 on success / -ENXIO if device does not exist + */ +static int pmcraid_slave_alloc(struct scsi_device *scsi_dev) +{ + struct pmcraid_resource_entry *temp, *res = NULL; + struct pmcraid_instance *pinstance; + u8 target, bus, lun; + unsigned long lock_flags; + int rc = -ENXIO; + pinstance = shost_priv(scsi_dev->host); + + /* Driver exposes VSET and GSCSI resources only; all other device types + * are not exposed. Resource list is synchronized using resource lock + * so any traversal or modifications to the list should be done inside + * this lock + */ + spin_lock_irqsave(&pinstance->resource_lock, lock_flags); + list_for_each_entry(temp, &pinstance->used_res_q, queue) { + + /* do not expose VSETs with order-ids >= 240 */ + if (RES_IS_VSET(temp->cfg_entry)) { + target = temp->cfg_entry.unique_flags1; + if (target >= PMCRAID_MAX_VSET_TARGETS) + continue; + bus = PMCRAID_VSET_BUS_ID; + lun = 0; + } else if (RES_IS_GSCSI(temp->cfg_entry)) { + target = RES_TARGET(temp->cfg_entry.resource_address); + bus = PMCRAID_PHYS_BUS_ID; + lun = RES_LUN(temp->cfg_entry.resource_address); + } else { + continue; + } + + if (bus == scsi_dev->channel && + target == scsi_dev->id && + lun == scsi_dev->lun) { + res = temp; + break; + } + } + + if (res) { + res->scsi_dev = scsi_dev; + scsi_dev->hostdata = res; + res->change_detected = 0; + atomic_set(&res->read_failures, 0); + atomic_set(&res->write_failures, 0); + rc = 0; + } + spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags); + return rc; +} + +/** + * pmcraid_slave_configure - Configures a SCSI device + * @scsi_dev: scsi device struct + * + * This fucntion is executed by SCSI mid layer just after a device is first + * scanned (i.e. it has responded to an INQUIRY). For VSET resources, the + * timeout value (default 30s) will be over-written to a higher value (60s) + * and max_sectors value will be over-written to 512. It also sets queue depth + * to host->cmd_per_lun value + * + * Return value: + * 0 on success + */ +static int pmcraid_slave_configure(struct scsi_device *scsi_dev) +{ + struct pmcraid_resource_entry *res = scsi_dev->hostdata; + + if (!res) + return 0; + + /* LLD exposes VSETs and Enclosure devices only */ + if (RES_IS_GSCSI(res->cfg_entry) && + scsi_dev->type != TYPE_ENCLOSURE) + return -ENXIO; + + pmcraid_info("configuring %x:%x:%x:%x\n", + scsi_dev->host->unique_id, + scsi_dev->channel, + scsi_dev->id, + scsi_dev->lun); + + if (RES_IS_GSCSI(res->cfg_entry)) { + scsi_dev->allow_restart = 1; + } else if (RES_IS_VSET(res->cfg_entry)) { + scsi_dev->allow_restart = 1; + blk_queue_rq_timeout(scsi_dev->request_queue, + PMCRAID_VSET_IO_TIMEOUT); + blk_queue_max_sectors(scsi_dev->request_queue, + PMCRAID_VSET_MAX_SECTORS); + } + + if (scsi_dev->tagged_supported && + (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) { + scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth); + scsi_adjust_queue_depth(scsi_dev, MSG_SIMPLE_TAG, + scsi_dev->host->cmd_per_lun); + } else { + scsi_adjust_queue_depth(scsi_dev, 0, + scsi_dev->host->cmd_per_lun); + } + + return 0; +} + +/** + * pmcraid_slave_destroy - Unconfigure a SCSI device before removing it + * + * @scsi_dev: scsi device struct + * + * This is called by mid-layer before removing a device. Pointer assignments + * done in pmcraid_slave_alloc will be reset to NULL here. + * + * Return value + * none + */ +static void pmcraid_slave_destroy(struct scsi_device *scsi_dev) +{ + struct pmcraid_resource_entry *res; + + res = (struct pmcraid_resource_entry *)scsi_dev->hostdata; + + if (res) + res->scsi_dev = NULL; + + scsi_dev->hostdata = NULL; +} + +/** + * pmcraid_change_queue_depth - Change the device's queue depth + * @scsi_dev: scsi device struct + * @depth: depth to set + * + * Return value + * actual depth set + */ +static int pmcraid_change_queue_depth(struct scsi_device *scsi_dev, int depth) +{ + if (depth > PMCRAID_MAX_CMD_PER_LUN) + depth = PMCRAID_MAX_CMD_PER_LUN; + + scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev), depth); + + return scsi_dev->queue_depth; +} + +/** + * pmcraid_change_queue_type - Change the device's queue type + * @scsi_dev: scsi device struct + * @tag: type of tags to use + * + * Return value: + * actual queue type set + */ +static int pmcraid_change_queue_type(struct scsi_device *scsi_dev, int tag) +{ + struct pmcraid_resource_entry *res; + + res = (struct pmcraid_resource_entry *)scsi_dev->hostdata; + + if ((res) && scsi_dev->tagged_supported && + (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) { + scsi_set_tag_type(scsi_dev, tag); + + if (tag) + scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth); + else + scsi_deactivate_tcq(scsi_dev, scsi_dev->queue_depth); + } else + tag = 0; + + return tag; +} + + +/** + * pmcraid_init_cmdblk - initializes a command block + * + * @cmd: pointer to struct pmcraid_cmd to be initialized + * @index: if >=0 first time initialization; otherwise reinitialization + * + * Return Value + * None + */ +void pmcraid_init_cmdblk(struct pmcraid_cmd *cmd, int index) +{ + struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb); + dma_addr_t dma_addr = cmd->ioa_cb_bus_addr; + + if (index >= 0) { + /* first time initialization (called from probe) */ + u32 ioasa_offset = + offsetof(struct pmcraid_control_block, ioasa); + + cmd->index = index; + ioarcb->response_handle = cpu_to_le32(index << 2); + ioarcb->ioarcb_bus_addr = cpu_to_le64(dma_addr); + ioarcb->ioasa_bus_addr = cpu_to_le64(dma_addr + ioasa_offset); + ioarcb->ioasa_len = cpu_to_le16(sizeof(struct pmcraid_ioasa)); + } else { + /* re-initialization of various lengths, called once command is + * processed by IOA + */ + memset(&cmd->ioa_cb->ioarcb.cdb, 0, PMCRAID_MAX_CDB_LEN); + ioarcb->request_flags0 = 0; + ioarcb->request_flags1 = 0; + ioarcb->cmd_timeout = 0; + ioarcb->ioarcb_bus_addr &= (~0x1FULL); + ioarcb->ioadl_bus_addr = 0; + ioarcb->ioadl_length = 0; + ioarcb->data_transfer_length = 0; + ioarcb->add_cmd_param_length = 0; + ioarcb->add_cmd_param_offset = 0; + cmd->ioa_cb->ioasa.ioasc = 0; + cmd->ioa_cb->ioasa.residual_data_length = 0; + cmd->u.time_left = 0; + } + + cmd->cmd_done = NULL; + cmd->scsi_cmd = NULL; + cmd->release = 0; + cmd->completion_req = 0; + cmd->dma_handle = 0; + init_timer(&cmd->timer); +} + +/** + * pmcraid_reinit_cmdblk - reinitialize a command block + * + * @cmd: pointer to struct pmcraid_cmd to be reinitialized + * + * Return Value + * None + */ +static void pmcraid_reinit_cmdblk(struct pmcraid_cmd *cmd) +{ + pmcraid_init_cmdblk(cmd, -1); +} + +/** + * pmcraid_get_free_cmd - get a free cmd block from command block pool + * @pinstance: adapter instance structure + * + * Return Value: + * returns pointer to cmd block or NULL if no blocks are available + */ +static struct pmcraid_cmd *pmcraid_get_free_cmd( + struct pmcraid_instance *pinstance +) +{ + struct pmcraid_cmd *cmd = NULL; + unsigned long lock_flags; + + /* free cmd block list is protected by free_pool_lock */ + spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags); + + if (!list_empty(&pinstance->free_cmd_pool)) { + cmd = list_entry(pinstance->free_cmd_pool.next, + struct pmcraid_cmd, free_list); + list_del(&cmd->free_list); + } + spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags); + + /* Initialize the command block before giving it the caller */ + if (cmd != NULL) + pmcraid_reinit_cmdblk(cmd); + return cmd; +} + +/** + * pmcraid_return_cmd - return a completed command block back into free pool + * @cmd: pointer to the command block + * + * Return Value: + * nothing + */ +void pmcraid_return_cmd(struct pmcraid_cmd *cmd) +{ + struct pmcraid_instance *pinstance = cmd->drv_inst; + unsigned long lock_flags; + + spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags); + list_add_tail(&cmd->free_list, &pinstance->free_cmd_pool); + spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags); +} + +/** + * pmcraid_read_interrupts - reads IOA interrupts + * + * @pinstance: pointer to adapter instance structure + * + * Return value + * interrupts read from IOA + */ +static u32 pmcraid_read_interrupts(struct pmcraid_instance *pinstance) +{ + return ioread32(pinstance->int_regs.ioa_host_interrupt_reg); +} + +/** + * pmcraid_disable_interrupts - Masks and clears all specified interrupts + * + * @pinstance: pointer to per adapter instance structure + * @intrs: interrupts to disable + * + * Return Value + * None + */ +static void pmcraid_disable_interrupts( + struct pmcraid_instance *pinstance, + u32 intrs +) +{ + u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg); + u32 nmask = gmask | GLOBAL_INTERRUPT_MASK; + + iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg); + iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_clr_reg); + iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_mask_reg); + ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg); +} + +/** + * pmcraid_enable_interrupts - Enables specified interrupts + * + * @pinstance: pointer to per adapter instance structure + * @intr: interrupts to enable + * + * Return Value + * None + */ +static void pmcraid_enable_interrupts( + struct pmcraid_instance *pinstance, + u32 intrs +) +{ + u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg); + u32 nmask = gmask & (~GLOBAL_INTERRUPT_MASK); + + iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg); + iowrite32(~intrs, pinstance->int_regs.ioa_host_interrupt_mask_reg); + ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg); + + pmcraid_info("enabled interrupts global mask = %x intr_mask = %x\n", + ioread32(pinstance->int_regs.global_interrupt_mask_reg), + ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg)); +} + +/** + * pmcraid_reset_type - Determine the required reset type + * @pinstance: pointer to adapter instance structure + * + * IOA requires hard reset if any of the following conditions is true. + * 1. If HRRQ valid interrupt is not masked + * 2. IOA reset alert doorbell is set + * 3. If there are any error interrupts + */ +static void pmcraid_reset_type(struct pmcraid_instance *pinstance) +{ + u32 mask; + u32 intrs; + u32 alerts; + + mask = ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg); + intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg); + alerts = ioread32(pinstance->int_regs.host_ioa_interrupt_reg); + + if ((mask & INTRS_HRRQ_VALID) == 0 || + (alerts & DOORBELL_IOA_RESET_ALERT) || + (intrs & PMCRAID_ERROR_INTERRUPTS)) { + pmcraid_info("IOA requires hard reset\n"); + pinstance->ioa_hard_reset = 1; + } + + /* If unit check is active, trigger the dump */ + if (intrs & INTRS_IOA_UNIT_CHECK) + pinstance->ioa_unit_check = 1; +} + +/** + * pmcraid_bist_done - completion function for PCI BIST + * @cmd: pointer to reset command + * Return Value + * none + */ + +static void pmcraid_ioa_reset(struct pmcraid_cmd *); + +static void pmcraid_bist_done(struct pmcraid_cmd *cmd) +{ + struct pmcraid_instance *pinstance = cmd->drv_inst; + unsigned long lock_flags; + int rc; + u16 pci_reg; + + rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg); + + /* If PCI config space can't be accessed wait for another two secs */ + if ((rc != PCIBIOS_SUCCESSFUL || (!(pci_reg & PCI_COMMAND_MEMORY))) && + cmd->u.time_left > 0) { + pmcraid_info("BIST not complete, waiting another 2 secs\n"); + cmd->timer.expires = jiffies + cmd->u.time_left; + cmd->u.time_left = 0; + cmd->timer.data = (unsigned long)cmd; + cmd->timer.function = + (void (*)(unsigned long))pmcraid_bist_done; + add_timer(&cmd->timer); + } else { + cmd->u.time_left = 0; + pmcraid_info("BIST is complete, proceeding with reset\n"); + spin_lock_irqsave(pinstance->host->host_lock, lock_flags); + pmcraid_ioa_reset(cmd); + spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags); + } +} + +/** + * pmcraid_start_bist - starts BIST + * @cmd: pointer to reset cmd + * Return Value + * none + */ +static void pmcraid_start_bist(struct pmcraid_cmd *cmd) +{ + struct pmcraid_instance *pinstance = cmd->drv_inst; + u32 doorbells, intrs; + + /* proceed with bist and wait for 2 seconds */ + iowrite32(DOORBELL_IOA_START_BIST, + pinstance->int_regs.host_ioa_interrupt_reg); + doorbells = ioread32(pinstance->int_regs.host_ioa_interrupt_reg); + intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg); + pmcraid_info("doorbells after start bist: %x intrs: %x \n", + doorbells, intrs); + + cmd->u.time_left = msecs_to_jiffies(PMCRAID_BIST_TIMEOUT); + cmd->timer.data = (unsigned long)cmd; + cmd->timer.expires = jiffies + msecs_to_jiffies(PMCRAID_BIST_TIMEOUT); + cmd->timer.function = (void (*)(unsigned long))pmcraid_bist_done; + add_timer(&cmd->timer); +} + +/** + * pmcraid_reset_alert_done - completion routine for reset_alert + * @cmd: pointer to command block used in reset sequence + * Return value + * None + */ +static void pmcraid_reset_alert_done(struct pmcraid_cmd *cmd) +{ + struct pmcraid_instance *pinstance = cmd->drv_inst; + u32 status = ioread32(pinstance->ioa_status); + unsigned long lock_flags; + + /* if the critical operation in progress bit is set or the wait times + * out, invoke reset engine to proceed with hard reset. If there is + * some more time to wait, restart the timer + */ + if (((status & INTRS_CRITICAL_OP_IN_PROGRESS) == 0) || + cmd->u.time_left <= 0) { + pmcraid_info("critical op is reset proceeding with reset\n"); + spin_lock_irqsave(pinstance->host->host_lock, lock_flags); + pmcraid_ioa_reset(cmd); + spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags); + } else { + pmcraid_info("critical op is not yet reset waiting again\n"); + /* restart timer if some more time is available to wait */ + cmd->u.time_left -= PMCRAID_CHECK_FOR_RESET_TIMEOUT; + cmd->timer.data = (unsigned long)cmd; + cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT; + cmd->timer.function = + (void (*)(unsigned long))pmcraid_reset_alert_done; + add_timer(&cmd->timer); + } +} + +/** + * pmcraid_reset_alert - alerts IOA for a possible reset + * @cmd : command block to be used for reset sequence. + * + * Return Value + * returns 0 if pci config-space is accessible and RESET_DOORBELL is + * successfully written to IOA. Returns non-zero in case pci_config_space + * is not accessible + */ +static void pmcraid_reset_alert(struct pmcraid_cmd *cmd) +{ + struct pmcraid_instance *pinstance = cmd->drv_inst; + u32 doorbells; + int rc; + u16 pci_reg; + + /* If we are able to access IOA PCI config space, alert IOA that we are + * going to reset it soon. This enables IOA to preserv persistent error + * data if any. In case memory space is not accessible, proceed with + * BIST or slot_reset + */ + rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg); + if ((rc == PCIBIOS_SUCCESSFUL) && (pci_reg & PCI_COMMAND_MEMORY)) { + + /* wait for IOA permission i.e until CRITICAL_OPERATION bit is + * reset IOA doesn't generate any interrupts when CRITICAL + * OPERATION bit is reset. A timer is started to wait for this + * bit to be reset. + */ + cmd->u.time_left = PMCRAID_RESET_TIMEOUT; + cmd->timer.data = (unsigned long)cmd; + cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT; + cmd->timer.function = + (void (*)(unsigned long))pmcraid_reset_alert_done; + add_timer(&cmd->timer); + + iowrite32(DOORBELL_IOA_RESET_ALERT, + pinstance->int_regs.host_ioa_interrupt_reg); + doorbells = + ioread32(pinstance->int_regs.host_ioa_interrupt_reg); + pmcraid_info("doorbells after reset alert: %x\n", doorbells); + } else { + pmcraid_info("PCI config is not accessible starting BIST\n"); + pinstance->ioa_state = IOA_STATE_IN_HARD_RESET; + pmcraid_start_bist(cmd); + } +} + +/** + * pmcraid_timeout_handler - Timeout handler for internally generated ops + * + * @cmd : pointer to command structure, that got timedout + * + * This function blocks host requests and initiates an adapter reset. + * + * Return value: + * None + */ +static void pmcraid_timeout_handler(struct pmcraid_cmd *cmd) +{ + struct pmcraid_instance *pinstance = cmd->drv_inst; + unsigned long lock_flags; + + dev_err(&pinstance->pdev->dev, + "Adapter being reset due to command timeout.\n"); + + /* Command timeouts result in hard reset sequence. The command that got + * timed out may be the one used as part of reset sequence. In this + * case restart reset sequence using the same command block even if + * reset is in progress. Otherwise fail this command and get a free + * command block to restart the reset sequence. + */ + spin_lock_irqsave(pinstance->host->host_lock, lock_flags); + if (!pinstance->ioa_reset_in_progress) { + pinstance->ioa_reset_attempts = 0; + cmd = pmcraid_get_free_cmd(pinstance); + + /* If we are out of command blocks, just return here itself. + * Some other command's timeout handler can do the reset job + */ + if (cmd == NULL) { + spin_unlock_irqrestore(pinstance->host->host_lock, + lock_flags); + pmcraid_err("no free cmnd block for timeout handler\n"); + return; + } + + pinstance->reset_cmd = cmd; + pinstance->ioa_reset_in_progress = 1; + } else { + pmcraid_info("reset is already in progress\n"); + + if (pinstance->reset_cmd != cmd) { + /* This command should have been given to IOA, this + * command will be completed by fail_outstanding_cmds + * anyway + */ + pmcraid_err("cmd is pending but reset in progress\n"); + } + + /* If this command was being used as part of the reset + * sequence, set cmd_done pointer to pmcraid_ioa_reset. This + * causes fail_outstanding_commands not to return the command + * block back to free pool + */ + if (cmd == pinstance->reset_cmd) + cmd->cmd_done = pmcraid_ioa_reset; + + } + + pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT; + scsi_block_requests(pinstance->host); + pmcraid_reset_alert(cmd); + spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags); +} + +/** + * pmcraid_internal_done - completion routine for internally generated cmds + * + * @cmd: command that got response from IOA + * + * Return Value: + * none + */ +static void pmcraid_internal_done(struct pmcraid_cmd *cmd) +{ + pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n", + cmd->ioa_cb->ioarcb.cdb[0], + le32_to_cpu(cmd->ioa_cb->ioasa.ioasc)); + + /* Some of the internal commands are sent with callers blocking for the + * response. Same will be indicated as part of cmd->completion_req + * field. Response path needs to wake up any waiters waiting for cmd + * completion if this flag is set. + */ + if (cmd->completion_req) { + cmd->completion_req = 0; + complete(&cmd->wait_for_completion); + } + + /* most of the internal commands are completed by caller itself, so + * no need to return the command block back to free pool until we are + * required to do so (e.g once done with initialization). + */ + if (cmd->release) { + cmd->release = 0; + pmcraid_return_cmd(cmd); + } +} + +/** + * pmcraid_reinit_cfgtable_done - done function for cfg table reinitialization + * + * @cmd: command that got response from IOA + * + * This routine is called after driver re-reads configuration table due to a + * lost CCN. It returns the command block back to free pool and schedules + * worker thread to add/delete devices into the system. + * + * Return Value: + * none + */ +static void pmcraid_reinit_cfgtable_done(struct pmcraid_cmd *cmd) +{ + pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n", + cmd->ioa_cb->ioarcb.cdb[0], + le32_to_cpu(cmd->ioa_cb->ioasa.ioasc)); + + if (cmd->release) { + cmd->release = 0; + pmcraid_return_cmd(cmd); + } + pmcraid_info("scheduling worker for config table reinitialization\n"); + schedule_work(&cmd->drv_inst->worker_q); +} + +/** + * pmcraid_erp_done - Process completion of SCSI error response from device + * @cmd: pmcraid_command + * + * This function copies the sense buffer into the scsi_cmd struct and completes + * scsi_cmd by calling scsi_done function. + * + * Return value: + * none + */ +static void pmcraid_erp_done(struct pmcraid_cmd *cmd) +{ + struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd; + struct pmcraid_instance *pinstance = cmd->drv_inst; + u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc); + + if (PMCRAID_IOASC_SENSE_KEY(ioasc) > 0) { + scsi_cmd->result |= (DID_ERROR << 16); + pmcraid_err("command CDB[0] = %x failed with IOASC: 0x%08X\n", + cmd->ioa_cb->ioarcb.cdb[0], ioasc); + } + + /* if we had allocated sense buffers for request sense, copy the sense + * release the buffers + */ + if (cmd->sense_buffer != NULL) { + memcpy(scsi_cmd->sense_buffer, + cmd->sense_buffer, + SCSI_SENSE_BUFFERSIZE); + pci_free_consistent(pinstance->pdev, + SCSI_SENSE_BUFFERSIZE, + cmd->sense_buffer, cmd->sense_buffer_dma); + cmd->sense_buffer = NULL; + cmd->sense_buffer_dma = 0; + } + + scsi_dma_unmap(scsi_cmd); + pmcraid_return_cmd(cmd); + scsi_cmd->scsi_done(scsi_cmd); +} + +/** + * pmcraid_fire_command - sends an IOA command to adapter + * + * This function adds the given block into pending command list + * and returns without waiting + * + * @cmd : command to be sent to the device + * + * Return Value + * None + */ +static void _pmcraid_fire_command(struct pmcraid_cmd *cmd) +{ + struct pmcraid_instance *pinstance = cmd->drv_inst; + unsigned long lock_flags; + + /* Add this command block to pending cmd pool. We do this prior to + * writting IOARCB to ioarrin because IOA might complete the command + * by the time we are about to add it to the list. Response handler + * (isr/tasklet) looks for cmb block in the pending pending list. + */ + spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags); + list_add_tail(&cmd->free_list, &pinstance->pending_cmd_pool); + spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags); + atomic_inc(&pinstance->outstanding_cmds); + + /* driver writes lower 32-bit value of IOARCB address only */ + mb(); + iowrite32(le32_to_cpu(cmd->ioa_cb->ioarcb.ioarcb_bus_addr), + pinstance->ioarrin); +} + +/** + * pmcraid_send_cmd - fires a command to IOA + * + * This function also sets up timeout function, and command completion + * function + * + * @cmd: pointer to the command block to be fired to IOA + * @cmd_done: command completion function, called once IOA responds + * @timeout: timeout to wait for this command completion + * @timeout_func: timeout handler + * + * Return value + * none + */ +static void pmcraid_send_cmd( + struct pmcraid_cmd *cmd, + void (*cmd_done) (struct pmcraid_cmd *), + unsigned long timeout, + void (*timeout_func) (struct pmcraid_cmd *) +) +{ + /* initialize done function */ + cmd->cmd_done = cmd_done; + + if (timeout_func) { + /* setup timeout handler */ + cmd->timer.data = (unsigned long)cmd; + cmd->timer.expires = jiffies + timeout; + cmd->timer.function = (void (*)(unsigned long))timeout_func; + add_timer(&cmd->timer); + } + + /* fire the command to IOA */ + _pmcraid_fire_command(cmd); +} + +/** + * pmcraid_ioa_shutdown - sends SHUTDOWN command to ioa + * + * @cmd: pointer to the command block used as part of reset sequence + * + * Return Value + * None + */ +static void pmcraid_ioa_shutdown(struct pmcraid_cmd *cmd) +{ + pmcraid_info("response for Cancel CCN CDB[0] = %x ioasc = %x\n", + cmd->ioa_cb->ioarcb.cdb[0], + le32_to_cpu(cmd->ioa_cb->ioasa.ioasc)); + + /* Note that commands sent during reset require next command to be sent + * to IOA. Hence reinit the done function as well as timeout function + */ + pmcraid_reinit_cmdblk(cmd); + cmd->ioa_cb->ioarcb.request_type = REQ_TYPE_IOACMD; + cmd->ioa_cb->ioarcb.resource_handle = + cpu_to_le32(PMCRAID_IOA_RES_HANDLE); + cmd->ioa_cb->ioarcb.cdb[0] = PMCRAID_IOA_SHUTDOWN; + cmd->ioa_cb->ioarcb.cdb[1] = PMCRAID_SHUTDOWN_NORMAL; + + /* fire shutdown command to hardware. */ + pmcraid_info("firing normal shutdown command (%d) to IOA\n", + le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle)); + + pmcraid_send_cmd(cmd, pmcraid_ioa_reset, + PMCRAID_SHUTDOWN_TIMEOUT, + pmcraid_timeout_handler); +} + +/** + * pmcraid_identify_hrrq - registers host rrq buffers with IOA + * @cmd: pointer to command block to be used for identify hrrq + * + * Return Value + * 0 in case of success, otherwise non-zero failure code + */ + +static void pmcraid_querycfg(struct pmcraid_cmd *); + +static void pmcraid_identify_hrrq(struct pmcraid_cmd *cmd) +{ + struct pmcraid_instance *pinstance = cmd->drv_inst; + struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb; + int index = 0; + __be64 hrrq_addr = cpu_to_be64(pinstance->hrrq_start_bus_addr[index]); + u32 hrrq_size = cpu_to_be32(sizeof(u32) * PMCRAID_MAX_CMD); + + pmcraid_reinit_cmdblk(cmd); + + /* Initialize ioarcb */ + ioarcb->request_type = REQ_TYPE_IOACMD; + ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE); + + /* initialize the hrrq number where IOA will respond to this command */ + ioarcb->hrrq_id = index; + ioarcb->cdb[0] = PMCRAID_IDENTIFY_HRRQ; + ioarcb->cdb[1] = index; + + /* IOA expects 64-bit pci address to be written in B.E format + * (i.e cdb[2]=MSByte..cdb[9]=LSB. + */ + pmcraid_info("HRRQ_IDENTIFY with hrrq:ioarcb => %llx:%llx\n", + hrrq_addr, ioarcb->ioarcb_bus_addr); + + memcpy(&(ioarcb->cdb[2]), &hrrq_addr, sizeof(hrrq_addr)); + memcpy(&(ioarcb->cdb[10]), &hrrq_size, sizeof(hrrq_size)); + + /* Subsequent commands require HRRQ identification to be successful. + * Note that this gets called even during reset from SCSI mid-layer + * or tasklet + */ + pmcraid_send_cmd(cmd, pmcraid_querycfg, + PMCRAID_INTERNAL_TIMEOUT, + pmcraid_timeout_handler); +} + +static void pmcraid_process_ccn(struct pmcraid_cmd *cmd); +static void pmcraid_process_ldn(struct pmcraid_cmd *cmd); + +/** + * pmcraid_send_hcam_cmd - send an initialized command block(HCAM) to IOA + * + * @cmd: initialized command block pointer + * + * Return Value + * none + */ +static void pmcraid_send_hcam_cmd(struct pmcraid_cmd *cmd) +{ + if (cmd->ioa_cb->ioarcb.cdb[1] == PMCRAID_HCAM_CODE_CONFIG_CHANGE) + atomic_set(&(cmd->drv_inst->ccn.ignore), 0); + else + atomic_set(&(cmd->drv_inst->ldn.ignore), 0); + + pmcraid_send_cmd(cmd, cmd->cmd_done, 0, NULL); +} + +/** + * pmcraid_init_hcam - send an initialized command block(HCAM) to IOA + * + * @pinstance: pointer to adapter instance structure + * @type: HCAM type + * + * Return Value + * pointer to initialized pmcraid_cmd structure or NULL + */ +static struct pmcraid_cmd *pmcraid_init_hcam +( + struct pmcraid_instance *pinstance, + u8 type +) +{ + struct pmcraid_cmd *cmd; + struct pmcraid_ioarcb *ioarcb; + struct pmcraid_ioadl_desc *ioadl; + struct pmcraid_hostrcb *hcam; + void (*cmd_done) (struct pmcraid_cmd *); + dma_addr_t dma; + int rcb_size; + + cmd = pmcraid_get_free_cmd(pinstance); + + if (!cmd) { + pmcraid_err("no free command blocks for hcam\n"); + return cmd; + } + + if (type == PMCRAID_HCAM_CODE_CONFIG_CHANGE) { + rcb_size = sizeof(struct pmcraid_hcam_ccn); + cmd_done = pmcraid_process_ccn; + dma = pinstance->ccn.baddr + PMCRAID_AEN_HDR_SIZE; + hcam = &pinstance->ccn; + } else { + rcb_size = sizeof(struct pmcraid_hcam_ldn); + cmd_done = pmcraid_process_ldn; + dma = pinstance->ldn.baddr + PMCRAID_AEN_HDR_SIZE; + hcam = &pinstance->ldn; + } + + /* initialize command pointer used for HCAM registration */ + hcam->cmd = cmd; + + ioarcb = &cmd->ioa_cb->ioarcb; + ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) + + offsetof(struct pmcraid_ioarcb, + add_data.u.ioadl[0])); + ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc)); + ioadl = ioarcb->add_data.u.ioadl; + + /* Initialize ioarcb */ + ioarcb->request_type = REQ_TYPE_HCAM; + ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE); + ioarcb->cdb[0] = PMCRAID_HOST_CONTROLLED_ASYNC; + ioarcb->cdb[1] = type; + ioarcb->cdb[7] = (rcb_size >> 8) & 0xFF; + ioarcb->cdb[8] = (rcb_size) & 0xFF; + + ioarcb->data_transfer_length = cpu_to_le32(rcb_size); + + ioadl[0].flags |= cpu_to_le32(IOADL_FLAGS_READ_LAST); + ioadl[0].data_len = cpu_to_le32(rcb_size); + ioadl[0].address = cpu_to_le32(dma); + + cmd->cmd_done = cmd_done; + return cmd; +} + +/** + * pmcraid_send_hcam - Send an HCAM to IOA + * @pinstance: ioa config struct + * @type: HCAM type + * + * This function will send a Host Controlled Async command to IOA. + * + * Return value: + * none + */ +static void pmcraid_send_hcam(struct pmcraid_instance *pinstance, u8 type) +{ + struct pmcraid_cmd *cmd = pmcraid_init_hcam(pinstance, type); + pmcraid_send_hcam_cmd(cmd); +} + + +/** + * pmcraid_prepare_cancel_cmd - prepares a command block to abort another + * + * @cmd: pointer to cmd that is used as cancelling command + * @cmd_to_cancel: pointer to the command that needs to be cancelled + */ +static void pmcraid_prepare_cancel_cmd( + struct pmcraid_cmd *cmd, + struct pmcraid_cmd *cmd_to_cancel +) +{ + struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb; + __be64 ioarcb_addr = cmd_to_cancel->ioa_cb->ioarcb.ioarcb_bus_addr; + + /* Get the resource handle to where the command to be aborted has been + * sent. + */ + ioarcb->resource_handle = cmd_to_cancel->ioa_cb->ioarcb.resource_handle; + ioarcb->request_type = REQ_TYPE_IOACMD; + memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN); + ioarcb->cdb[0] = PMCRAID_ABORT_CMD; + + /* IOARCB address of the command to be cancelled is given in + * cdb[2]..cdb[9] is Big-Endian format. Note that length bits in + * IOARCB address are not masked. + */ + ioarcb_addr = cpu_to_be64(ioarcb_addr); + memcpy(&(ioarcb->cdb[2]), &ioarcb_addr, sizeof(ioarcb_addr)); +} + +/** + * pmcraid_cancel_hcam - sends ABORT task to abort a given HCAM + * + * @cmd: command to be used as cancelling command + * @type: HCAM type + * @cmd_done: op done function for the cancelling command + */ +static void pmcraid_cancel_hcam( + struct pmcraid_cmd *cmd, + u8 type, + void (*cmd_done) (struct pmcraid_cmd *) +) +{ + struct pmcraid_instance *pinstance; + struct pmcraid_hostrcb *hcam; + + pinstance = cmd->drv_inst; + hcam = (type == PMCRAID_HCAM_CODE_LOG_DATA) ? + &pinstance->ldn : &pinstance->ccn; + + /* prepare for cancelling previous hcam command. If the HCAM is + * currently not pending with IOA, we would have hcam->cmd as non-null + */ + if (hcam->cmd == NULL) + return; + + pmcraid_prepare_cancel_cmd(cmd, hcam->cmd); + + /* writing to IOARRIN must be protected by host_lock, as mid-layer + * schedule queuecommand while we are doing this + */ + pmcraid_send_cmd(cmd, cmd_done, + PMCRAID_INTERNAL_TIMEOUT, + pmcraid_timeout_handler); +} + +/** + * pmcraid_cancel_ccn - cancel CCN HCAM already registered with IOA + * + * @cmd: command block to be used for cancelling the HCAM + */ +static void pmcraid_cancel_ccn(struct pmcraid_cmd *cmd) +{ + pmcraid_info("response for Cancel LDN CDB[0] = %x ioasc = %x\n", + cmd->ioa_cb->ioarcb.cdb[0], + le32_to_cpu(cmd->ioa_cb->ioasa.ioasc)); + + pmcraid_reinit_cmdblk(cmd); + + pmcraid_cancel_hcam(cmd, + PMCRAID_HCAM_CODE_CONFIG_CHANGE, + pmcraid_ioa_shutdown); +} + +/** + * pmcraid_cancel_ldn - cancel LDN HCAM already registered with IOA + * + * @cmd: command block to be used for cancelling the HCAM + */ +static void pmcraid_cancel_ldn(struct pmcraid_cmd *cmd) +{ + pmcraid_cancel_hcam(cmd, + PMCRAID_HCAM_CODE_LOG_DATA, + pmcraid_cancel_ccn); +} + +/** + * pmcraid_expose_resource - check if the resource can be exposed to OS + * + * @cfgte: pointer to configuration table entry of the resource + * + * Return value: + * true if resource can be added to midlayer, false(0) otherwise + */ +static int pmcraid_expose_resource(struct pmcraid_config_table_entry *cfgte) +{ + int retval = 0; + + if (cfgte->resource_type == RES_TYPE_VSET) + retval = ((cfgte->unique_flags1 & 0xFF) < 0xFE); + else if (cfgte->resource_type == RES_TYPE_GSCSI) + retval = (RES_BUS(cfgte->resource_address) != + PMCRAID_VIRTUAL_ENCL_BUS_ID); + return retval; +} + +/* attributes supported by pmcraid_event_family */ +enum { + PMCRAID_AEN_ATTR_UNSPEC, + PMCRAID_AEN_ATTR_EVENT, + __PMCRAID_AEN_ATTR_MAX, +}; +#define PMCRAID_AEN_ATTR_MAX (__PMCRAID_AEN_ATTR_MAX - 1) + +/* commands supported by pmcraid_event_family */ +enum { + PMCRAID_AEN_CMD_UNSPEC, + PMCRAID_AEN_CMD_EVENT, + __PMCRAID_AEN_CMD_MAX, +}; +#define PMCRAID_AEN_CMD_MAX (__PMCRAID_AEN_CMD_MAX - 1) + +static struct genl_family pmcraid_event_family = { + .id = GENL_ID_GENERATE, + .name = "pmcraid", + .version = 1, + .maxattr = PMCRAID_AEN_ATTR_MAX +}; + +/** + * pmcraid_netlink_init - registers pmcraid_event_family + * + * Return value: + * 0 if the pmcraid_event_family is successfully registered + * with netlink generic, non-zero otherwise + */ +static int pmcraid_netlink_init(void) +{ + int result; + + result = genl_register_family(&pmcraid_event_family); + + if (result) + return result; + + pmcraid_info("registered NETLINK GENERIC group: %d\n", + pmcraid_event_family.id); + + return result; +} + +/** + * pmcraid_netlink_release - unregisters pmcraid_event_family + * + * Return value: + * none + */ +static void pmcraid_netlink_release(void) +{ + genl_unregister_family(&pmcraid_event_family); +} + +/** + * pmcraid_notify_aen - sends event msg to user space application + * @pinstance: pointer to adapter instance structure + * @type: HCAM type + * + * Return value: + * 0 if success, error value in case of any failure. + */ +static int pmcraid_notify_aen(struct pmcraid_instance *pinstance, u8 type) +{ + struct sk_buff *skb; + struct pmcraid_aen_msg *aen_msg; + void *msg_header; + int data_size, total_size; + int result; + + + if (type == PMCRAID_HCAM_CODE_LOG_DATA) { + aen_msg = pinstance->ldn.msg; + data_size = pinstance->ldn.hcam->data_len; + } else { + aen_msg = pinstance->ccn.msg; + data_size = pinstance->ccn.hcam->data_len; + } + + data_size += sizeof(struct pmcraid_hcam_hdr); + aen_msg->hostno = (pinstance->host->unique_id << 16 | + MINOR(pinstance->cdev.dev)); + aen_msg->length = data_size; + data_size += sizeof(*aen_msg); + + total_size = nla_total_size(data_size); + skb = genlmsg_new(total_size, GFP_ATOMIC); + + + if (!skb) { + pmcraid_err("Failed to allocate aen data SKB of size: %x\n", + total_size); + return -ENOMEM; + } + + /* add the genetlink message header */ + msg_header = genlmsg_put(skb, 0, 0, + &pmcraid_event_family, 0, + PMCRAID_AEN_CMD_EVENT); + if (!msg_header) { + pmcraid_err("failed to copy command details\n"); + nlmsg_free(skb); + return -ENOMEM; + } + + result = nla_put(skb, PMCRAID_AEN_ATTR_EVENT, data_size, aen_msg); + + if (result) { + pmcraid_err("failed to copy AEN attribute data \n"); + nlmsg_free(skb); + return -EINVAL; + } + + /* send genetlink multicast message to notify appplications */ + result = genlmsg_end(skb, msg_header); + + if (result < 0) { + pmcraid_err("genlmsg_end failed\n"); + nlmsg_free(skb); + return result; + } + + result = + genlmsg_multicast(skb, 0, pmcraid_event_family.id, GFP_ATOMIC); + + /* If there are no listeners, genlmsg_multicast may return non-zero + * value. + */ + if (result) + pmcraid_info("failed to send %s event message %x!\n", + type == PMCRAID_HCAM_CODE_LOG_DATA ? "LDN" : "CCN", + result); + return result; +} + +/** + * pmcraid_handle_config_change - Handle a config change from the adapter + * @pinstance: pointer to per adapter instance structure + * + * Return value: + * none + */ +static void pmcraid_handle_config_change(struct pmcraid_instance *pinstance) +{ + struct pmcraid_config_table_entry *cfg_entry; + struct pmcraid_hcam_ccn *ccn_hcam; + struct pmcraid_cmd *cmd; + struct pmcraid_cmd *cfgcmd; + struct pmcraid_resource_entry *res = NULL; + u32 new_entry = 1; + unsigned long lock_flags; + unsigned long host_lock_flags; + int rc; + + ccn_hcam = (struct pmcraid_hcam_ccn *)pinstance->ccn.hcam; + cfg_entry = &ccn_hcam->cfg_entry; + + pmcraid_info + ("CCN(%x): %x type: %x lost: %x flags: %x res: %x:%x:%x:%x\n", + pinstance->ccn.hcam->ilid, + pinstance->ccn.hcam->op_code, + pinstance->ccn.hcam->notification_type, + pinstance->ccn.hcam->notification_lost, + pinstance->ccn.hcam->flags, + pinstance->host->unique_id, + RES_IS_VSET(*cfg_entry) ? PMCRAID_VSET_BUS_ID : + (RES_IS_GSCSI(*cfg_entry) ? PMCRAID_PHYS_BUS_ID : + RES_BUS(cfg_entry->resource_address)), + RES_IS_VSET(*cfg_entry) ? cfg_entry->unique_flags1 : + RES_TARGET(cfg_entry->resource_address), + RES_LUN(cfg_entry->resource_address)); + + + /* If this HCAM indicates a lost notification, read the config table */ + if (pinstance->ccn.hcam->notification_lost) { + cfgcmd = pmcraid_get_free_cmd(pinstance); + if (cfgcmd) { + pmcraid_info("lost CCN, reading config table\b"); + pinstance->reinit_cfg_table = 1; + pmcraid_querycfg(cfgcmd); + } else { + pmcraid_err("lost CCN, no free cmd for querycfg\n"); + } + goto out_notify_apps; + } + + /* If this resource is not going to be added to mid-layer, just notify + * applications and return + */ + if (!pmcraid_expose_resource(cfg_entry)) + goto out_notify_apps; + + spin_lock_irqsave(&pinstance->resource_lock, lock_flags); + list_for_each_entry(res, &pinstance->used_res_q, queue) { + rc = memcmp(&res->cfg_entry.resource_address, + &cfg_entry->resource_address, + sizeof(cfg_entry->resource_address)); + if (!rc) { + new_entry = 0; + break; + } + } + + if (new_entry) { + + /* If there are more number of resources than what driver can + * manage, do not notify the applications about the CCN. Just + * ignore this notifications and re-register the same HCAM + */ + if (list_empty(&pinstance->free_res_q)) { + spin_unlock_irqrestore(&pinstance->resource_lock, + lock_flags); + pmcraid_err("too many resources attached\n"); + spin_lock_irqsave(pinstance->host->host_lock, + host_lock_flags); + pmcraid_send_hcam(pinstance, + PMCRAID_HCAM_CODE_CONFIG_CHANGE); + spin_unlock_irqrestore(pinstance->host->host_lock, + host_lock_flags); + return; + } + + res = list_entry(pinstance->free_res_q.next, + struct pmcraid_resource_entry, queue); + + list_del(&res->queue); + res->scsi_dev = NULL; + res->reset_progress = 0; + list_add_tail(&res->queue, &pinstance->used_res_q); + } + + memcpy(&res->cfg_entry, cfg_entry, + sizeof(struct pmcraid_config_table_entry)); + + if (pinstance->ccn.hcam->notification_type == + NOTIFICATION_TYPE_ENTRY_DELETED) { + if (res->scsi_dev) { + res->change_detected = RES_CHANGE_DEL; + res->cfg_entry.resource_handle = + PMCRAID_INVALID_RES_HANDLE; + schedule_work(&pinstance->worker_q); + } else { + /* This may be one of the non-exposed resources */ + list_move_tail(&res->queue, &pinstance->free_res_q); + } + } else if (!res->scsi_dev) { + res->change_detected = RES_CHANGE_ADD; + schedule_work(&pinstance->worker_q); + } + spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags); + +out_notify_apps: + + /* Notify configuration changes to registered applications.*/ + if (!pmcraid_disable_aen) + pmcraid_notify_aen(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE); + + cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE); + if (cmd) + pmcraid_send_hcam_cmd(cmd); +} + +/** + * pmcraid_get_error_info - return error string for an ioasc + * @ioasc: ioasc code + * Return Value + * none + */ +static struct pmcraid_ioasc_error *pmcraid_get_error_info(u32 ioasc) +{ + int i; + for (i = 0; i < ARRAY_SIZE(pmcraid_ioasc_error_table); i++) { + if (pmcraid_ioasc_error_table[i].ioasc_code == ioasc) + return &pmcraid_ioasc_error_table[i]; + } + return NULL; +} + +/** + * pmcraid_ioasc_logger - log IOASC information based user-settings + * @ioasc: ioasc code + * @cmd: pointer to command that resulted in 'ioasc' + */ +void pmcraid_ioasc_logger(u32 ioasc, struct pmcraid_cmd *cmd) +{ + struct pmcraid_ioasc_error *error_info = pmcraid_get_error_info(ioasc); + + if (error_info == NULL || + cmd->drv_inst->current_log_level < error_info->log_level) + return; + + /* log the error string */ + pmcraid_err("cmd [%d] for resource %x failed with %x(%s)\n", + cmd->ioa_cb->ioarcb.cdb[0], + cmd->ioa_cb->ioarcb.resource_handle, + le32_to_cpu(ioasc), error_info->error_string); +} + +/** + * pmcraid_handle_error_log - Handle a config change (error log) from the IOA + * + * @pinstance: pointer to per adapter instance structure + * + * Return value: + * none + */ +static void pmcraid_handle_error_log(struct pmcraid_instance *pinstance) +{ + struct pmcraid_hcam_ldn *hcam_ldn; + u32 ioasc; + + hcam_ldn = (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam; + + pmcraid_info + ("LDN(%x): %x type: %x lost: %x flags: %x overlay id: %x\n", + pinstance->ldn.hcam->ilid, + pinstance->ldn.hcam->op_code, + pinstance->ldn.hcam->notification_type, + pinstance->ldn.hcam->notification_lost, + pinstance->ldn.hcam->flags, + pinstance->ldn.hcam->overlay_id); + + /* log only the errors, no need to log informational log entries */ + if (pinstance->ldn.hcam->notification_type != + NOTIFICATION_TYPE_ERROR_LOG) + return; + + if (pinstance->ldn.hcam->notification_lost == + HOSTRCB_NOTIFICATIONS_LOST) + dev_err(&pinstance->pdev->dev, "Error notifications lost\n"); + + ioasc = le32_to_cpu(hcam_ldn->error_log.fd_ioasc); + + if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET || + ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER) { + dev_err(&pinstance->pdev->dev, + "UnitAttention due to IOA Bus Reset\n"); + scsi_report_bus_reset( + pinstance->host, + RES_BUS(hcam_ldn->error_log.fd_ra)); + } + + return; +} + +/** + * pmcraid_process_ccn - Op done function for a CCN. + * @cmd: pointer to command struct + * + * This function is the op done function for a configuration + * change notification + * + * Return value: + * none + */ +static void pmcraid_process_ccn(struct pmcraid_cmd *cmd) +{ + struct pmcraid_instance *pinstance = cmd->drv_inst; + u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc); + unsigned long lock_flags; + + pinstance->ccn.cmd = NULL; + pmcraid_return_cmd(cmd); + + /* If driver initiated IOA reset happened while this hcam was pending + * with IOA, or IOA bringdown sequence is in progress, no need to + * re-register the hcam + */ + if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET || + atomic_read(&pinstance->ccn.ignore) == 1) { + return; + } else if (ioasc) { + dev_err(&pinstance->pdev->dev, + "Host RCB (CCN) failed with IOASC: 0x%08X\n", ioasc); + spin_lock_irqsave(pinstance->host->host_lock, lock_flags); + pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE); + spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags); + } else { + pmcraid_handle_config_change(pinstance); + } +} + +/** + * pmcraid_process_ldn - op done function for an LDN + * @cmd: pointer to command block + * + * Return value + * none + */ +static void pmcraid_initiate_reset(struct pmcraid_instance *); + +static void pmcraid_process_ldn(struct pmcraid_cmd *cmd) +{ + struct pmcraid_instance *pinstance = cmd->drv_inst; + struct pmcraid_hcam_ldn *ldn_hcam = + (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam; + u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc); + u32 fd_ioasc = le32_to_cpu(ldn_hcam->error_log.fd_ioasc); + unsigned long lock_flags; + + /* return the command block back to freepool */ + pinstance->ldn.cmd = NULL; + pmcraid_return_cmd(cmd); + + /* If driver initiated IOA reset happened while this hcam was pending + * with IOA, no need to re-register the hcam as reset engine will do it + * once reset sequence is complete + */ + if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET || + atomic_read(&pinstance->ccn.ignore) == 1) { + return; + } else if (!ioasc) { + pmcraid_handle_error_log(pinstance); + if (fd_ioasc == PMCRAID_IOASC_NR_IOA_RESET_REQUIRED) { + spin_lock_irqsave(pinstance->host->host_lock, + lock_flags); + pmcraid_initiate_reset(pinstance); + spin_unlock_irqrestore(pinstance->host->host_lock, + lock_flags); + return; + } + } else { + dev_err(&pinstance->pdev->dev, + "Host RCB(LDN) failed with IOASC: 0x%08X\n", ioasc); + } + /* send netlink message for HCAM notification if enabled */ + if (!pmcraid_disable_aen) + pmcraid_notify_aen(pinstance, PMCRAID_HCAM_CODE_LOG_DATA); + + cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA); + if (cmd) + pmcraid_send_hcam_cmd(cmd); +} + +/** + * pmcraid_register_hcams - register HCAMs for CCN and LDN + * + * @pinstance: pointer per adapter instance structure + * + * Return Value + * none + */ +static void pmcraid_register_hcams(struct pmcraid_instance *pinstance) +{ + pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE); + pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA); +} + +/** + * pmcraid_unregister_hcams - cancel HCAMs registered already + * @cmd: pointer to command used as part of reset sequence + */ +static void pmcraid_unregister_hcams(struct pmcraid_cmd *cmd) +{ + struct pmcraid_instance *pinstance = cmd->drv_inst; + + /* During IOA bringdown, HCAM gets fired and tasklet proceeds with + * handling hcam response though it is not necessary. In order to + * prevent this, set 'ignore', so that bring-down sequence doesn't + * re-send any more hcams + */ + atomic_set(&pinstance->ccn.ignore, 1); + atomic_set(&pinstance->ldn.ignore, 1); + + /* If adapter reset was forced as part of runtime reset sequence, + * start the reset sequence. + */ + if (pinstance->force_ioa_reset && !pinstance->ioa_bringdown) { + pinstance->force_ioa_reset = 0; + pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT; + pmcraid_reset_alert(cmd); + return; + } + + /* Driver tries to cancel HCAMs by sending ABORT TASK for each HCAM + * one after the other. So CCN cancellation will be triggered by + * pmcraid_cancel_ldn itself. + */ + pmcraid_cancel_ldn(cmd); +} + +/** + * pmcraid_reset_enable_ioa - re-enable IOA after a hard reset + * @pinstance: pointer to adapter instance structure + * Return Value + * 1 if TRANSITION_TO_OPERATIONAL is active, otherwise 0 + */ +static void pmcraid_reinit_buffers(struct pmcraid_instance *); + +static int pmcraid_reset_enable_ioa(struct pmcraid_instance *pinstance) +{ + u32 intrs; + + pmcraid_reinit_buffers(pinstance); + intrs = pmcraid_read_interrupts(pinstance); + + pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS); + + if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) { + iowrite32(INTRS_TRANSITION_TO_OPERATIONAL, + pinstance->int_regs.ioa_host_interrupt_mask_reg); + iowrite32(INTRS_TRANSITION_TO_OPERATIONAL, + pinstance->int_regs.ioa_host_interrupt_clr_reg); + return 1; + } else { + return 0; + } +} + +/** + * pmcraid_soft_reset - performs a soft reset and makes IOA become ready + * @cmd : pointer to reset command block + * + * Return Value + * none + */ +static void pmcraid_soft_reset(struct pmcraid_cmd *cmd) +{ + struct pmcraid_instance *pinstance = cmd->drv_inst; + u32 int_reg; + u32 doorbell; + + /* There will be an interrupt when Transition to Operational bit is + * set so tasklet would execute next reset task. The timeout handler + * would re-initiate a reset + */ + cmd->cmd_done = pmcraid_ioa_reset; + cmd->timer.data = (unsigned long)cmd; + cmd->timer.expires = jiffies + + msecs_to_jiffies(PMCRAID_TRANSOP_TIMEOUT); + cmd->timer.function = (void (*)(unsigned long))pmcraid_timeout_handler; + + if (!timer_pending(&cmd->timer)) + add_timer(&cmd->timer); + + /* Enable destructive diagnostics on IOA if it is not yet in + * operational state + */ + doorbell = DOORBELL_RUNTIME_RESET | + DOORBELL_ENABLE_DESTRUCTIVE_DIAGS; + + iowrite32(doorbell, pinstance->int_regs.host_ioa_interrupt_reg); + int_reg = ioread32(pinstance->int_regs.ioa_host_interrupt_reg); + pmcraid_info("Waiting for IOA to become operational %x:%x\n", + ioread32(pinstance->int_regs.host_ioa_interrupt_reg), + int_reg); +} + +/** + * pmcraid_get_dump - retrieves IOA dump in case of Unit Check interrupt + * + * @pinstance: pointer to adapter instance structure + * + * Return Value + * none + */ +static void pmcraid_get_dump(struct pmcraid_instance *pinstance) +{ + pmcraid_info("%s is not yet implemented\n", __func__); +} + +/** + * pmcraid_fail_outstanding_cmds - Fails all outstanding ops. + * @pinstance: pointer to adapter instance structure + * + * This function fails all outstanding ops. If they are submitted to IOA + * already, it sends cancel all messages if IOA is still accepting IOARCBs, + * otherwise just completes the commands and returns the cmd blocks to free + * pool. + * + * Return value: + * none + */ +static void pmcraid_fail_outstanding_cmds(struct pmcraid_instance *pinstance) +{ + struct pmcraid_cmd *cmd, *temp; + unsigned long lock_flags; + + /* pending command list is protected by pending_pool_lock. Its + * traversal must be done as within this lock + */ + spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags); + list_for_each_entry_safe(cmd, temp, &pinstance->pending_cmd_pool, + free_list) { + list_del(&cmd->free_list); + spin_unlock_irqrestore(&pinstance->pending_pool_lock, + lock_flags); + cmd->ioa_cb->ioasa.ioasc = + cpu_to_le32(PMCRAID_IOASC_IOA_WAS_RESET); + cmd->ioa_cb->ioasa.ilid = + cpu_to_be32(PMCRAID_DRIVER_ILID); + + /* In case the command timer is still running */ + del_timer(&cmd->timer); + + /* If this is an IO command, complete it by invoking scsi_done + * function. If this is one of the internal commands other + * than pmcraid_ioa_reset and HCAM commands invoke cmd_done to + * complete it + */ + if (cmd->scsi_cmd) { + + struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd; + __le32 resp = cmd->ioa_cb->ioarcb.response_handle; + + scsi_cmd->result |= DID_ERROR << 16; + + scsi_dma_unmap(scsi_cmd); + pmcraid_return_cmd(cmd); + + + pmcraid_info("failing(%d) CDB[0] = %x result: %x\n", + le32_to_cpu(resp) >> 2, + cmd->ioa_cb->ioarcb.cdb[0], + scsi_cmd->result); + scsi_cmd->scsi_done(scsi_cmd); + } else if (cmd->cmd_done == pmcraid_internal_done || + cmd->cmd_done == pmcraid_erp_done) { + cmd->cmd_done(cmd); + } else if (cmd->cmd_done != pmcraid_ioa_reset) { + pmcraid_return_cmd(cmd); + } + + atomic_dec(&pinstance->outstanding_cmds); + spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags); + } + + spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags); +} + +/** + * pmcraid_ioa_reset - Implementation of IOA reset logic + * + * @cmd: pointer to the cmd block to be used for entire reset process + * + * This function executes most of the steps required for IOA reset. This gets + * called by user threads (modprobe/insmod/rmmod) timer, tasklet and midlayer's + * 'eh_' thread. Access to variables used for controling the reset sequence is + * synchronized using host lock. Various functions called during reset process + * would make use of a single command block, pointer to which is also stored in + * adapter instance structure. + * + * Return Value + * None + */ +static void pmcraid_ioa_reset(struct pmcraid_cmd *cmd) +{ + struct pmcraid_instance *pinstance = cmd->drv_inst; + u8 reset_complete = 0; + + pinstance->ioa_reset_in_progress = 1; + + if (pinstance->reset_cmd != cmd) { + pmcraid_err("reset is called with different command block\n"); + pinstance->reset_cmd = cmd; + } + + pmcraid_info("reset_engine: state = %d, command = %p\n", + pinstance->ioa_state, cmd); + + switch (pinstance->ioa_state) { + + case IOA_STATE_DEAD: + /* If IOA is offline, whatever may be the reset reason, just + * return. callers might be waiting on the reset wait_q, wake + * up them + */ + pmcraid_err("IOA is offline no reset is possible\n"); + reset_complete = 1; + break; + + case IOA_STATE_IN_BRINGDOWN: + /* we enter here, once ioa shutdown command is processed by IOA + * Alert IOA for a possible reset. If reset alert fails, IOA + * goes through hard-reset + */ + pmcraid_disable_interrupts(pinstance, ~0); + pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT; + pmcraid_reset_alert(cmd); + break; + + case IOA_STATE_UNKNOWN: + /* We may be called during probe or resume. Some pre-processing + * is required for prior to reset + */ + scsi_block_requests(pinstance->host); + + /* If asked to reset while IOA was processing responses or + * there are any error responses then IOA may require + * hard-reset. + */ + if (pinstance->ioa_hard_reset == 0) { + if (ioread32(pinstance->ioa_status) & + INTRS_TRANSITION_TO_OPERATIONAL) { + pmcraid_info("sticky bit set, bring-up\n"); + pinstance->ioa_state = IOA_STATE_IN_BRINGUP; + pmcraid_reinit_cmdblk(cmd); + pmcraid_identify_hrrq(cmd); + } else { + pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET; + pmcraid_soft_reset(cmd); + } + } else { + /* Alert IOA of a possible reset and wait for critical + * operation in progress bit to reset + */ + pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT; + pmcraid_reset_alert(cmd); + } + break; + + case IOA_STATE_IN_RESET_ALERT: + /* If critical operation in progress bit is reset or wait gets + * timed out, reset proceeds with starting BIST on the IOA. + * pmcraid_ioa_hard_reset keeps a count of reset attempts. If + * they are 3 or more, reset engine marks IOA dead and returns + */ + pinstance->ioa_state = IOA_STATE_IN_HARD_RESET; + pmcraid_start_bist(cmd); + break; + + case IOA_STATE_IN_HARD_RESET: + pinstance->ioa_reset_attempts++; + + /* retry reset if we haven't reached maximum allowed limit */ + if (pinstance->ioa_reset_attempts > PMCRAID_RESET_ATTEMPTS) { + pinstance->ioa_reset_attempts = 0; + pmcraid_err("IOA didn't respond marking it as dead\n"); + pinstance->ioa_state = IOA_STATE_DEAD; + reset_complete = 1; + break; + } + + /* Once either bist or pci reset is done, restore PCI config + * space. If this fails, proceed with hard reset again + */ + + if (pci_restore_state(pinstance->pdev)) { + pmcraid_info("config-space error resetting again\n"); + pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT; + pmcraid_reset_alert(cmd); + break; + } + + /* fail all pending commands */ + pmcraid_fail_outstanding_cmds(pinstance); + + /* check if unit check is active, if so extract dump */ + if (pinstance->ioa_unit_check) { + pmcraid_info("unit check is active\n"); + pinstance->ioa_unit_check = 0; + pmcraid_get_dump(pinstance); + pinstance->ioa_reset_attempts--; + pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT; + pmcraid_reset_alert(cmd); + break; + } + + /* if the reset reason is to bring-down the ioa, we might be + * done with the reset restore pci_config_space and complete + * the reset + */ + if (pinstance->ioa_bringdown) { + pmcraid_info("bringing down the adapter\n"); + pinstance->ioa_shutdown_type = SHUTDOWN_NONE; + pinstance->ioa_bringdown = 0; + pinstance->ioa_state = IOA_STATE_UNKNOWN; + reset_complete = 1; + } else { + /* bring-up IOA, so proceed with soft reset + * Reinitialize hrrq_buffers and their indices also + * enable interrupts after a pci_restore_state + */ + if (pmcraid_reset_enable_ioa(pinstance)) { + pinstance->ioa_state = IOA_STATE_IN_BRINGUP; + pmcraid_info("bringing up the adapter\n"); + pmcraid_reinit_cmdblk(cmd); + pmcraid_identify_hrrq(cmd); + } else { + pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET; + pmcraid_soft_reset(cmd); + } + } + break; + + case IOA_STATE_IN_SOFT_RESET: + /* TRANSITION TO OPERATIONAL is on so start initialization + * sequence + */ + pmcraid_info("In softreset proceeding with bring-up\n"); + pinstance->ioa_state = IOA_STATE_IN_BRINGUP; + + /* Initialization commands start with HRRQ identification. From + * now on tasklet completes most of the commands as IOA is up + * and intrs are enabled + */ + pmcraid_identify_hrrq(cmd); + break; + + case IOA_STATE_IN_BRINGUP: + /* we are done with bringing up of IOA, change the ioa_state to + * operational and wake up any waiters + */ + pinstance->ioa_state = IOA_STATE_OPERATIONAL; + reset_complete = 1; + break; + + case IOA_STATE_OPERATIONAL: + default: + /* When IOA is operational and a reset is requested, check for + * the reset reason. If reset is to bring down IOA, unregister + * HCAMs and initiate shutdown; if adapter reset is forced then + * restart reset sequence again + */ + if (pinstance->ioa_shutdown_type == SHUTDOWN_NONE && + pinstance->force_ioa_reset == 0) { + reset_complete = 1; + } else { + if (pinstance->ioa_shutdown_type != SHUTDOWN_NONE) + pinstance->ioa_state = IOA_STATE_IN_BRINGDOWN; + pmcraid_reinit_cmdblk(cmd); + pmcraid_unregister_hcams(cmd); + } + break; + } + + /* reset will be completed if ioa_state is either DEAD or UNKNOWN or + * OPERATIONAL. Reset all control variables used during reset, wake up + * any waiting threads and let the SCSI mid-layer send commands. Note + * that host_lock must be held before invoking scsi_report_bus_reset. + */ + if (reset_complete) { + pinstance->ioa_reset_in_progress = 0; + pinstance->ioa_reset_attempts = 0; + pinstance->reset_cmd = NULL; + pinstance->ioa_shutdown_type = SHUTDOWN_NONE; + pinstance->ioa_bringdown = 0; + pmcraid_return_cmd(cmd); + + /* If target state is to bring up the adapter, proceed with + * hcam registration and resource exposure to mid-layer. + */ + if (pinstance->ioa_state == IOA_STATE_OPERATIONAL) + pmcraid_register_hcams(pinstance); + + wake_up_all(&pinstance->reset_wait_q); + } + + return; +} + +/** + * pmcraid_initiate_reset - initiates reset sequence. This is called from + * ISR/tasklet during error interrupts including IOA unit check. If reset + * is already in progress, it just returns, otherwise initiates IOA reset + * to bring IOA up to operational state. + * + * @pinstance: pointer to adapter instance structure + * + * Return value + * none + */ +static void pmcraid_initiate_reset(struct pmcraid_instance *pinstance) +{ + struct pmcraid_cmd *cmd; + + /* If the reset is already in progress, just return, otherwise start + * reset sequence and return + */ + if (!pinstance->ioa_reset_in_progress) { + scsi_block_requests(pinstance->host); + cmd = pmcraid_get_free_cmd(pinstance); + + if (cmd == NULL) { + pmcraid_err("no cmnd blocks for initiate_reset\n"); + return; + } + + pinstance->ioa_shutdown_type = SHUTDOWN_NONE; + pinstance->reset_cmd = cmd; + pinstance->force_ioa_reset = 1; + pmcraid_ioa_reset(cmd); + } +} + +/** + * pmcraid_reset_reload - utility routine for doing IOA reset either to bringup + * or bringdown IOA + * @pinstance: pointer adapter instance structure + * @shutdown_type: shutdown type to be used NONE, NORMAL or ABRREV + * @target_state: expected target state after reset + * + * Note: This command initiates reset and waits for its completion. Hence this + * should not be called from isr/timer/tasklet functions (timeout handlers, + * error response handlers and interrupt handlers). + * + * Return Value + * 1 in case ioa_state is not target_state, 0 otherwise. + */ +static int pmcraid_reset_reload( + struct pmcraid_instance *pinstance, + u8 shutdown_type, + u8 target_state +) +{ + struct pmcraid_cmd *reset_cmd = NULL; + unsigned long lock_flags; + int reset = 1; + + spin_lock_irqsave(pinstance->host->host_lock, lock_flags); + + if (pinstance->ioa_reset_in_progress) { + pmcraid_info("reset_reload: reset is already in progress\n"); + + spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags); + + wait_event(pinstance->reset_wait_q, + !pinstance->ioa_reset_in_progress); + + spin_lock_irqsave(pinstance->host->host_lock, lock_flags); + + if (pinstance->ioa_state == IOA_STATE_DEAD) { + spin_unlock_irqrestore(pinstance->host->host_lock, + lock_flags); + pmcraid_info("reset_reload: IOA is dead\n"); + return reset; + } else if (pinstance->ioa_state == target_state) { + reset = 0; + } + } + + if (reset) { + pmcraid_info("reset_reload: proceeding with reset\n"); + scsi_block_requests(pinstance->host); + reset_cmd = pmcraid_get_free_cmd(pinstance); + + if (reset_cmd == NULL) { + pmcraid_err("no free cmnd for reset_reload\n"); + spin_unlock_irqrestore(pinstance->host->host_lock, + lock_flags); + return reset; + } + + if (shutdown_type == SHUTDOWN_NORMAL) + pinstance->ioa_bringdown = 1; + + pinstance->ioa_shutdown_type = shutdown_type; + pinstance->reset_cmd = reset_cmd; + pinstance->force_ioa_reset = reset; + pmcraid_info("reset_reload: initiating reset\n"); + pmcraid_ioa_reset(reset_cmd); + spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags); + pmcraid_info("reset_reload: waiting for reset to complete\n"); + wait_event(pinstance->reset_wait_q, + !pinstance->ioa_reset_in_progress); + + pmcraid_info("reset_reload: reset is complete !! \n"); + scsi_unblock_requests(pinstance->host); + if (pinstance->ioa_state == target_state) + reset = 0; + } + + return reset; +} + +/** + * pmcraid_reset_bringdown - wrapper over pmcraid_reset_reload to bringdown IOA + * + * @pinstance: pointer to adapter instance structure + * + * Return Value + * whatever is returned from pmcraid_reset_reload + */ +static int pmcraid_reset_bringdown(struct pmcraid_instance *pinstance) +{ + return pmcraid_reset_reload(pinstance, + SHUTDOWN_NORMAL, + IOA_STATE_UNKNOWN); +} + +/** + * pmcraid_reset_bringup - wrapper over pmcraid_reset_reload to bring up IOA + * + * @pinstance: pointer to adapter instance structure + * + * Return Value + * whatever is returned from pmcraid_reset_reload + */ +static int pmcraid_reset_bringup(struct pmcraid_instance *pinstance) +{ + return pmcraid_reset_reload(pinstance, + SHUTDOWN_NONE, + IOA_STATE_OPERATIONAL); +} + +/** + * pmcraid_request_sense - Send request sense to a device + * @cmd: pmcraid command struct + * + * This function sends a request sense to a device as a result of a check + * condition. This method re-uses the same command block that failed earlier. + */ +static void pmcraid_request_sense(struct pmcraid_cmd *cmd) +{ + struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb; + struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl; + + /* allocate DMAable memory for sense buffers */ + cmd->sense_buffer = pci_alloc_consistent(cmd->drv_inst->pdev, + SCSI_SENSE_BUFFERSIZE, + &cmd->sense_buffer_dma); + + if (cmd->sense_buffer == NULL) { + pmcraid_err + ("couldn't allocate sense buffer for request sense\n"); + pmcraid_erp_done(cmd); + return; + } + + /* re-use the command block */ + memset(&cmd->ioa_cb->ioasa, 0, sizeof(struct pmcraid_ioasa)); + memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN); + ioarcb->request_flags0 = (SYNC_COMPLETE | + NO_LINK_DESCS | + INHIBIT_UL_CHECK); + ioarcb->request_type = REQ_TYPE_SCSI; + ioarcb->cdb[0] = REQUEST_SENSE; + ioarcb->cdb[4] = SCSI_SENSE_BUFFERSIZE; + + ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) + + offsetof(struct pmcraid_ioarcb, + add_data.u.ioadl[0])); + ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc)); + + ioarcb->data_transfer_length = cpu_to_le32(SCSI_SENSE_BUFFERSIZE); + + ioadl->address = cpu_to_le64(cmd->sense_buffer_dma); + ioadl->data_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE); + ioadl->flags = cpu_to_le32(IOADL_FLAGS_LAST_DESC); + + /* request sense might be called as part of error response processing + * which runs in tasklets context. It is possible that mid-layer might + * schedule queuecommand during this time, hence, writting to IOARRIN + * must be protect by host_lock + */ + pmcraid_send_cmd(cmd, pmcraid_erp_done, + PMCRAID_REQUEST_SENSE_TIMEOUT, + pmcraid_timeout_handler); +} + +/** + * pmcraid_cancel_all - cancel all outstanding IOARCBs as part of error recovery + * @cmd: command that failed + * @sense: true if request_sense is required after cancel all + * + * This function sends a cancel all to a device to clear the queue. + */ +static void pmcraid_cancel_all(struct pmcraid_cmd *cmd, u32 sense) +{ + struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd; + struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb; + struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata; + void (*cmd_done) (struct pmcraid_cmd *) = sense ? pmcraid_erp_done + : pmcraid_request_sense; + + memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN); + ioarcb->request_flags0 = SYNC_OVERRIDE; + ioarcb->request_type = REQ_TYPE_IOACMD; + ioarcb->cdb[0] = PMCRAID_CANCEL_ALL_REQUESTS; + + if (RES_IS_GSCSI(res->cfg_entry)) + ioarcb->cdb[1] = PMCRAID_SYNC_COMPLETE_AFTER_CANCEL; + + ioarcb->ioadl_bus_addr = 0; + ioarcb->ioadl_length = 0; + ioarcb->data_transfer_length = 0; + ioarcb->ioarcb_bus_addr &= (~0x1FULL); + + /* writing to IOARRIN must be protected by host_lock, as mid-layer + * schedule queuecommand while we are doing this + */ + pmcraid_send_cmd(cmd, cmd_done, + PMCRAID_REQUEST_SENSE_TIMEOUT, + pmcraid_timeout_handler); +} + +/** + * pmcraid_frame_auto_sense: frame fixed format sense information + * + * @cmd: pointer to failing command block + * + * Return value + * none + */ +static void pmcraid_frame_auto_sense(struct pmcraid_cmd *cmd) +{ + u8 *sense_buf = cmd->scsi_cmd->sense_buffer; + struct pmcraid_resource_entry *res = cmd->scsi_cmd->device->hostdata; + struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa; + u32 ioasc = le32_to_cpu(ioasa->ioasc); + u32 failing_lba = 0; + + memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE); + cmd->scsi_cmd->result = SAM_STAT_CHECK_CONDITION; + + if (RES_IS_VSET(res->cfg_entry) && + ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC && + ioasa->u.vset.failing_lba_hi != 0) { + + sense_buf[0] = 0x72; + sense_buf[1] = PMCRAID_IOASC_SENSE_KEY(ioasc); + sense_buf[2] = PMCRAID_IOASC_SENSE_CODE(ioasc); + sense_buf[3] = PMCRAID_IOASC_SENSE_QUAL(ioasc); + + sense_buf[7] = 12; + sense_buf[8] = 0; + sense_buf[9] = 0x0A; + sense_buf[10] = 0x80; + + failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_hi); + + sense_buf[12] = (failing_lba & 0xff000000) >> 24; + sense_buf[13] = (failing_lba & 0x00ff0000) >> 16; + sense_buf[14] = (failing_lba & 0x0000ff00) >> 8; + sense_buf[15] = failing_lba & 0x000000ff; + + failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_lo); + + sense_buf[16] = (failing_lba & 0xff000000) >> 24; + sense_buf[17] = (failing_lba & 0x00ff0000) >> 16; + sense_buf[18] = (failing_lba & 0x0000ff00) >> 8; + sense_buf[19] = failing_lba & 0x000000ff; + } else { + sense_buf[0] = 0x70; + sense_buf[2] = PMCRAID_IOASC_SENSE_KEY(ioasc); + sense_buf[12] = PMCRAID_IOASC_SENSE_CODE(ioasc); + sense_buf[13] = PMCRAID_IOASC_SENSE_QUAL(ioasc); + + if (ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC) { + if (RES_IS_VSET(res->cfg_entry)) + failing_lba = + le32_to_cpu(ioasa->u. + vset.failing_lba_lo); + sense_buf[0] |= 0x80; + sense_buf[3] = (failing_lba >> 24) & 0xff; + sense_buf[4] = (failing_lba >> 16) & 0xff; + sense_buf[5] = (failing_lba >> 8) & 0xff; + sense_buf[6] = failing_lba & 0xff; + } + + sense_buf[7] = 6; /* additional length */ + } +} + +/** + * pmcraid_error_handler - Error response handlers for a SCSI op + * @cmd: pointer to pmcraid_cmd that has failed + * + * This function determines whether or not to initiate ERP on the affected + * device. This is called from a tasklet, which doesn't hold any locks. + * + * Return value: + * 0 it caller can complete the request, otherwise 1 where in error + * handler itself completes the request and returns the command block + * back to free-pool + */ +static int pmcraid_error_handler(struct pmcraid_cmd *cmd) +{ + struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd; + struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata; + struct pmcraid_instance *pinstance = cmd->drv_inst; + struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa; + u32 ioasc = le32_to_cpu(ioasa->ioasc); + u32 masked_ioasc = ioasc & PMCRAID_IOASC_SENSE_MASK; + u32 sense_copied = 0; + + if (!res) { + pmcraid_info("resource pointer is NULL\n"); + return 0; + } + + /* If this was a SCSI read/write command keep count of errors */ + if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_READ_CMD) + atomic_inc(&res->read_failures); + else if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_WRITE_CMD) + atomic_inc(&res->write_failures); + + if (!RES_IS_GSCSI(res->cfg_entry) && + masked_ioasc != PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR) { + pmcraid_frame_auto_sense(cmd); + } + + /* Log IOASC/IOASA information based on user settings */ + pmcraid_ioasc_logger(ioasc, cmd); + + switch (masked_ioasc) { + + case PMCRAID_IOASC_AC_TERMINATED_BY_HOST: + scsi_cmd->result |= (DID_ABORT << 16); + break; + + case PMCRAID_IOASC_IR_INVALID_RESOURCE_HANDLE: + case PMCRAID_IOASC_HW_CANNOT_COMMUNICATE: + scsi_cmd->result |= (DID_NO_CONNECT << 16); + break; + + case PMCRAID_IOASC_NR_SYNC_REQUIRED: + res->sync_reqd = 1; + scsi_cmd->result |= (DID_IMM_RETRY << 16); + break; + + case PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC: + scsi_cmd->result |= (DID_PASSTHROUGH << 16); + break; + + case PMCRAID_IOASC_UA_BUS_WAS_RESET: + case PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER: + if (!res->reset_progress) + scsi_report_bus_reset(pinstance->host, + scsi_cmd->device->channel); + scsi_cmd->result |= (DID_ERROR << 16); + break; + + case PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR: + scsi_cmd->result |= PMCRAID_IOASC_SENSE_STATUS(ioasc); + res->sync_reqd = 1; + + /* if check_condition is not active return with error otherwise + * get/frame the sense buffer + */ + if (PMCRAID_IOASC_SENSE_STATUS(ioasc) != + SAM_STAT_CHECK_CONDITION && + PMCRAID_IOASC_SENSE_STATUS(ioasc) != SAM_STAT_ACA_ACTIVE) + return 0; + + /* If we have auto sense data as part of IOASA pass it to + * mid-layer + */ + if (ioasa->auto_sense_length != 0) { + short sense_len = ioasa->auto_sense_length; + int data_size = min_t(u16, le16_to_cpu(sense_len), + SCSI_SENSE_BUFFERSIZE); + + memcpy(scsi_cmd->sense_buffer, + ioasa->sense_data, + data_size); + sense_copied = 1; + } + + if (RES_IS_GSCSI(res->cfg_entry)) { + pmcraid_cancel_all(cmd, sense_copied); + } else if (sense_copied) { + pmcraid_erp_done(cmd); + return 0; + } else { + pmcraid_request_sense(cmd); + } + + return 1; + + case PMCRAID_IOASC_NR_INIT_CMD_REQUIRED: + break; + + default: + if (PMCRAID_IOASC_SENSE_KEY(ioasc) > RECOVERED_ERROR) + scsi_cmd->result |= (DID_ERROR << 16); + break; + } + return 0; +} + +/** + * pmcraid_reset_device - device reset handler functions + * + * @scsi_cmd: scsi command struct + * @modifier: reset modifier indicating the reset sequence to be performed + * + * This function issues a device reset to the affected device. + * A LUN reset will be sent to the device first. If that does + * not work, a target reset will be sent. + * + * Return value: + * SUCCESS / FAILED + */ +static int pmcraid_reset_device( + struct scsi_cmnd *scsi_cmd, + unsigned long timeout, + u8 modifier +) +{ + struct pmcraid_cmd *cmd; + struct pmcraid_instance *pinstance; + struct pmcraid_resource_entry *res; + struct pmcraid_ioarcb *ioarcb; + unsigned long lock_flags; + u32 ioasc; + + pinstance = + (struct pmcraid_instance *)scsi_cmd->device->host->hostdata; + res = scsi_cmd->device->hostdata; + + if (!res) { + pmcraid_err("reset_device: NULL resource pointer\n"); + return FAILED; + } + + /* If adapter is currently going through reset/reload, return failed. + * This will force the mid-layer to call _eh_bus/host reset, which + * will then go to sleep and wait for the reset to complete + */ + spin_lock_irqsave(pinstance->host->host_lock, lock_flags); + if (pinstance->ioa_reset_in_progress || + pinstance->ioa_state == IOA_STATE_DEAD) { + spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags); + return FAILED; + } + + res->reset_progress = 1; + pmcraid_info("Resetting %s resource with addr %x\n", + ((modifier & RESET_DEVICE_LUN) ? "LUN" : + ((modifier & RESET_DEVICE_TARGET) ? "TARGET" : "BUS")), + le32_to_cpu(res->cfg_entry.resource_address)); + + /* get a free cmd block */ + cmd = pmcraid_get_free_cmd(pinstance); + + if (cmd == NULL) { + spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags); + pmcraid_err("%s: no cmd blocks are available\n", __func__); + return FAILED; + } + + ioarcb = &cmd->ioa_cb->ioarcb; + ioarcb->resource_handle = res->cfg_entry.resource_handle; + ioarcb->request_type = REQ_TYPE_IOACMD; + ioarcb->cdb[0] = PMCRAID_RESET_DEVICE; + + /* Initialize reset modifier bits */ + if (modifier) + modifier = ENABLE_RESET_MODIFIER | modifier; + + ioarcb->cdb[1] = modifier; + + init_completion(&cmd->wait_for_completion); + cmd->completion_req = 1; + + pmcraid_info("cmd(CDB[0] = %x) for %x with index = %d\n", + cmd->ioa_cb->ioarcb.cdb[0], + le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle), + le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2); + + pmcraid_send_cmd(cmd, + pmcraid_internal_done, + timeout, + pmcraid_timeout_handler); + + spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags); + + /* RESET_DEVICE command completes after all pending IOARCBs are + * completed. Once this command is completed, pmcraind_internal_done + * will wake up the 'completion' queue. + */ + wait_for_completion(&cmd->wait_for_completion); + + /* complete the command here itself and return the command block + * to free list + */ + pmcraid_return_cmd(cmd); + res->reset_progress = 0; + ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc); + + /* set the return value based on the returned ioasc */ + return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS; +} + +/** + * _pmcraid_io_done - helper for pmcraid_io_done function + * + * @cmd: pointer to pmcraid command struct + * @reslen: residual data length to be set in the ioasa + * @ioasc: ioasc either returned by IOA or set by driver itself. + * + * This function is invoked by pmcraid_io_done to complete mid-layer + * scsi ops. + * + * Return value: + * 0 if caller is required to return it to free_pool. Returns 1 if + * caller need not worry about freeing command block as error handler + * will take care of that. + */ + +static int _pmcraid_io_done(struct pmcraid_cmd *cmd, int reslen, int ioasc) +{ + struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd; + int rc = 0; + + scsi_set_resid(scsi_cmd, reslen); + + pmcraid_info("response(%d) CDB[0] = %x ioasc:result: %x:%x\n", + le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2, + cmd->ioa_cb->ioarcb.cdb[0], + ioasc, scsi_cmd->result); + + if (PMCRAID_IOASC_SENSE_KEY(ioasc) != 0) + rc = pmcraid_error_handler(cmd); + + if (rc == 0) { + scsi_dma_unmap(scsi_cmd); + scsi_cmd->scsi_done(scsi_cmd); + } + + return rc; +} + +/** + * pmcraid_io_done - SCSI completion function + * + * @cmd: pointer to pmcraid command struct + * + * This function is invoked by tasklet/mid-layer error handler to completing + * the SCSI ops sent from mid-layer. + * + * Return value + * none + */ + +static void pmcraid_io_done(struct pmcraid_cmd *cmd) +{ + u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc); + u32 reslen = le32_to_cpu(cmd->ioa_cb->ioasa.residual_data_length); + + if (_pmcraid_io_done(cmd, reslen, ioasc) == 0) + pmcraid_return_cmd(cmd); +} + +/** + * pmcraid_abort_cmd - Aborts a single IOARCB already submitted to IOA + * + * @cmd: command block of the command to be aborted + * + * Return Value: + * returns pointer to command structure used as cancelling cmd + */ +static struct pmcraid_cmd *pmcraid_abort_cmd(struct pmcraid_cmd *cmd) +{ + struct pmcraid_cmd *cancel_cmd; + struct pmcraid_instance *pinstance; + struct pmcraid_resource_entry *res; + + pinstance = (struct pmcraid_instance *)cmd->drv_inst; + res = cmd->scsi_cmd->device->hostdata; + + cancel_cmd = pmcraid_get_free_cmd(pinstance); + + if (cancel_cmd == NULL) { + pmcraid_err("%s: no cmd blocks are available\n", __func__); + return NULL; + } + + pmcraid_prepare_cancel_cmd(cancel_cmd, cmd); + + pmcraid_info("aborting command CDB[0]= %x with index = %d\n", + cmd->ioa_cb->ioarcb.cdb[0], + cmd->ioa_cb->ioarcb.response_handle >> 2); + + init_completion(&cancel_cmd->wait_for_completion); + cancel_cmd->completion_req = 1; + + pmcraid_info("command (%d) CDB[0] = %x for %x\n", + le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.response_handle) >> 2, + cmd->ioa_cb->ioarcb.cdb[0], + le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.resource_handle)); + + pmcraid_send_cmd(cancel_cmd, + pmcraid_internal_done, + PMCRAID_INTERNAL_TIMEOUT, + pmcraid_timeout_handler); + return cancel_cmd; +} + +/** + * pmcraid_abort_complete - Waits for ABORT TASK completion + * + * @cancel_cmd: command block use as cancelling command + * + * Return Value: + * returns SUCCESS if ABORT TASK has good completion + * otherwise FAILED + */ +static int pmcraid_abort_complete(struct pmcraid_cmd *cancel_cmd) +{ + struct pmcraid_resource_entry *res; + u32 ioasc; + + wait_for_completion(&cancel_cmd->wait_for_completion); + res = cancel_cmd->u.res; + cancel_cmd->u.res = NULL; + ioasc = le32_to_cpu(cancel_cmd->ioa_cb->ioasa.ioasc); + + /* If the abort task is not timed out we will get a Good completion + * as sense_key, otherwise we may get one the following responses + * due to subsquent bus reset or device reset. In case IOASC is + * NR_SYNC_REQUIRED, set sync_reqd flag for the corresponding resource + */ + if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET || + ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED) { + if (ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED) + res->sync_reqd = 1; + ioasc = 0; + } + + /* complete the command here itself */ + pmcraid_return_cmd(cancel_cmd); + return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS; +} + +/** + * pmcraid_eh_abort_handler - entry point for aborting a single task on errors + * + * @scsi_cmd: scsi command struct given by mid-layer. When this is called + * mid-layer ensures that no other commands are queued. This + * never gets called under interrupt, but a separate eh thread. + * + * Return value: + * SUCCESS / FAILED + */ +static int pmcraid_eh_abort_handler(struct scsi_cmnd *scsi_cmd) +{ + struct pmcraid_instance *pinstance; + struct pmcraid_cmd *cmd; + struct pmcraid_resource_entry *res; + unsigned long host_lock_flags; + unsigned long pending_lock_flags; + struct pmcraid_cmd *cancel_cmd = NULL; + int cmd_found = 0; + int rc = FAILED; + + pinstance = + (struct pmcraid_instance *)scsi_cmd->device->host->hostdata; + + dev_err(&pinstance->pdev->dev, + "I/O command timed out, aborting it.\n"); + + res = scsi_cmd->device->hostdata; + + if (res == NULL) + return rc; + + /* If we are currently going through reset/reload, return failed. + * This will force the mid-layer to eventually call + * pmcraid_eh_host_reset which will then go to sleep and wait for the + * reset to complete + */ + spin_lock_irqsave(pinstance->host->host_lock, host_lock_flags); + + if (pinstance->ioa_reset_in_progress || + pinstance->ioa_state == IOA_STATE_DEAD) { + spin_unlock_irqrestore(pinstance->host->host_lock, + host_lock_flags); + return rc; + } + + /* loop over pending cmd list to find cmd corresponding to this + * scsi_cmd. Note that this command might not have been completed + * already. locking: all pending commands are protected with + * pending_pool_lock. + */ + spin_lock_irqsave(&pinstance->pending_pool_lock, pending_lock_flags); + list_for_each_entry(cmd, &pinstance->pending_cmd_pool, free_list) { + + if (cmd->scsi_cmd == scsi_cmd) { + cmd_found = 1; + break; + } + } + + spin_unlock_irqrestore(&pinstance->pending_pool_lock, + pending_lock_flags); + + /* If the command to be aborted was given to IOA and still pending with + * it, send ABORT_TASK to abort this and wait for its completion + */ + if (cmd_found) + cancel_cmd = pmcraid_abort_cmd(cmd); + + spin_unlock_irqrestore(pinstance->host->host_lock, + host_lock_flags); + + if (cancel_cmd) { + cancel_cmd->u.res = cmd->scsi_cmd->device->hostdata; + rc = pmcraid_abort_complete(cancel_cmd); + } + + return cmd_found ? rc : SUCCESS; +} + +/** + * pmcraid_eh_xxxx_reset_handler - bus/target/device reset handler callbacks + * + * @scmd: pointer to scsi_cmd that was sent to the resource to be reset. + * + * All these routines invokve pmcraid_reset_device with appropriate parameters. + * Since these are called from mid-layer EH thread, no other IO will be queued + * to the resource being reset. However, control path (IOCTL) may be active so + * it is necessary to synchronize IOARRIN writes which pmcraid_reset_device + * takes care by locking/unlocking host_lock. + * + * Return value + * SUCCESS or FAILED + */ +static int pmcraid_eh_device_reset_handler(struct scsi_cmnd *scmd) +{ + pmcraid_err("Doing device reset due to an I/O command timeout.\n"); + return pmcraid_reset_device(scmd, + PMCRAID_INTERNAL_TIMEOUT, + RESET_DEVICE_LUN); +} + +static int pmcraid_eh_bus_reset_handler(struct scsi_cmnd *scmd) +{ + pmcraid_err("Doing bus reset due to an I/O command timeout.\n"); + return pmcraid_reset_device(scmd, + PMCRAID_RESET_BUS_TIMEOUT, + RESET_DEVICE_BUS); +} + +static int pmcraid_eh_target_reset_handler(struct scsi_cmnd *scmd) +{ + pmcraid_err("Doing target reset due to an I/O command timeout.\n"); + return pmcraid_reset_device(scmd, + PMCRAID_INTERNAL_TIMEOUT, + RESET_DEVICE_TARGET); +} + +/** + * pmcraid_eh_host_reset_handler - adapter reset handler callback + * + * @scmd: pointer to scsi_cmd that was sent to a resource of adapter + * + * Initiates adapter reset to bring it up to operational state + * + * Return value + * SUCCESS or FAILED + */ +static int pmcraid_eh_host_reset_handler(struct scsi_cmnd *scmd) +{ + unsigned long interval = 10000; /* 10 seconds interval */ + int waits = jiffies_to_msecs(PMCRAID_RESET_HOST_TIMEOUT) / interval; + struct pmcraid_instance *pinstance = + (struct pmcraid_instance *)(scmd->device->host->hostdata); + + + /* wait for an additional 150 seconds just in case firmware could come + * up and if it could complete all the pending commands excluding the + * two HCAM (CCN and LDN). + */ + while (waits--) { + if (atomic_read(&pinstance->outstanding_cmds) <= + PMCRAID_MAX_HCAM_CMD) + return SUCCESS; + msleep(interval); + } + + dev_err(&pinstance->pdev->dev, + "Adapter being reset due to an I/O command timeout.\n"); + return pmcraid_reset_bringup(pinstance) == 0 ? SUCCESS : FAILED; +} + +/** + * pmcraid_task_attributes - Translate SPI Q-Tags to task attributes + * @scsi_cmd: scsi command struct + * + * Return value + * number of tags or 0 if the task is not tagged + */ +static u8 pmcraid_task_attributes(struct scsi_cmnd *scsi_cmd) +{ + char tag[2]; + u8 rc = 0; + + if (scsi_populate_tag_msg(scsi_cmd, tag)) { + switch (tag[0]) { + case MSG_SIMPLE_TAG: + rc = TASK_TAG_SIMPLE; + break; + case MSG_HEAD_TAG: + rc = TASK_TAG_QUEUE_HEAD; + break; + case MSG_ORDERED_TAG: + rc = TASK_TAG_ORDERED; + break; + }; + } + + return rc; +} + + +/** + * pmcraid_init_ioadls - initializes IOADL related fields in IOARCB + * @cmd: pmcraid command struct + * @sgcount: count of scatter-gather elements + * + * Return value + * returns pointer pmcraid_ioadl_desc, initialized to point to internal + * or external IOADLs + */ +struct pmcraid_ioadl_desc * +pmcraid_init_ioadls(struct pmcraid_cmd *cmd, int sgcount) +{ + struct pmcraid_ioadl_desc *ioadl; + struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb; + int ioadl_count = 0; + + if (ioarcb->add_cmd_param_length) + ioadl_count = DIV_ROUND_UP(ioarcb->add_cmd_param_length, 16); + ioarcb->ioadl_length = + sizeof(struct pmcraid_ioadl_desc) * sgcount; + + if ((sgcount + ioadl_count) > (ARRAY_SIZE(ioarcb->add_data.u.ioadl))) { + /* external ioadls start at offset 0x80 from control_block + * structure, re-using 24 out of 27 ioadls part of IOARCB. + * It is necessary to indicate to firmware that driver is + * using ioadls to be treated as external to IOARCB. + */ + ioarcb->ioarcb_bus_addr &= ~(0x1FULL); + ioarcb->ioadl_bus_addr = + cpu_to_le64((cmd->ioa_cb_bus_addr) + + offsetof(struct pmcraid_ioarcb, + add_data.u.ioadl[3])); + ioadl = &ioarcb->add_data.u.ioadl[3]; + } else { + ioarcb->ioadl_bus_addr = + cpu_to_le64((cmd->ioa_cb_bus_addr) + + offsetof(struct pmcraid_ioarcb, + add_data.u.ioadl[ioadl_count])); + + ioadl = &ioarcb->add_data.u.ioadl[ioadl_count]; + ioarcb->ioarcb_bus_addr |= + DIV_ROUND_CLOSEST(sgcount + ioadl_count, 8); + } + + return ioadl; +} + +/** + * pmcraid_build_ioadl - Build a scatter/gather list and map the buffer + * @pinstance: pointer to adapter instance structure + * @cmd: pmcraid command struct + * + * This function is invoked by queuecommand entry point while sending a command + * to firmware. This builds ioadl descriptors and sets up ioarcb fields. + * + * Return value: + * 0 on success or -1 on failure + */ +static int pmcraid_build_ioadl( + struct pmcraid_instance *pinstance, + struct pmcraid_cmd *cmd +) +{ + int i, nseg; + struct scatterlist *sglist; + + struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd; + struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb); + struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl; + + u32 length = scsi_bufflen(scsi_cmd); + + if (!length) + return 0; + + nseg = scsi_dma_map(scsi_cmd); + + if (nseg < 0) { + dev_err(&pinstance->pdev->dev, "scsi_map_dma failed!\n"); + return -1; + } else if (nseg > PMCRAID_MAX_IOADLS) { + scsi_dma_unmap(scsi_cmd); + dev_err(&pinstance->pdev->dev, + "sg count is (%d) more than allowed!\n", nseg); + return -1; + } + + /* Initialize IOARCB data transfer length fields */ + if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE) + ioarcb->request_flags0 |= TRANSFER_DIR_WRITE; + + ioarcb->request_flags0 |= NO_LINK_DESCS; + ioarcb->data_transfer_length = cpu_to_le32(length); + ioadl = pmcraid_init_ioadls(cmd, nseg); + + /* Initialize IOADL descriptor addresses */ + scsi_for_each_sg(scsi_cmd, sglist, nseg, i) { + ioadl[i].data_len = cpu_to_le32(sg_dma_len(sglist)); + ioadl[i].address = cpu_to_le64(sg_dma_address(sglist)); + ioadl[i].flags = 0; + } + /* setup last descriptor */ + ioadl[i - 1].flags = cpu_to_le32(IOADL_FLAGS_LAST_DESC); + + return 0; +} + +/** + * pmcraid_free_sglist - Frees an allocated SG buffer list + * @sglist: scatter/gather list pointer + * + * Free a DMA'able memory previously allocated with pmcraid_alloc_sglist + * + * Return value: + * none + */ +static void pmcraid_free_sglist(struct pmcraid_sglist *sglist) +{ + int i; + + for (i = 0; i < sglist->num_sg; i++) + __free_pages(sg_page(&(sglist->scatterlist[i])), + sglist->order); + + kfree(sglist); +} + +/** + * pmcraid_alloc_sglist - Allocates memory for a SG list + * @buflen: buffer length + * + * Allocates a DMA'able buffer in chunks and assembles a scatter/gather + * list. + * + * Return value + * pointer to sglist / NULL on failure + */ +static struct pmcraid_sglist *pmcraid_alloc_sglist(int buflen) +{ + struct pmcraid_sglist *sglist; + struct scatterlist *scatterlist; + struct page *page; + int num_elem, i, j; + int sg_size; + int order; + int bsize_elem; + + sg_size = buflen / (PMCRAID_MAX_IOADLS - 1); + order = (sg_size > 0) ? get_order(sg_size) : 0; + bsize_elem = PAGE_SIZE * (1 << order); + + /* Determine the actual number of sg entries needed */ + if (buflen % bsize_elem) + num_elem = (buflen / bsize_elem) + 1; + else + num_elem = buflen / bsize_elem; + + /* Allocate a scatter/gather list for the DMA */ + sglist = kzalloc(sizeof(struct pmcraid_sglist) + + (sizeof(struct scatterlist) * (num_elem - 1)), + GFP_KERNEL); + + if (sglist == NULL) + return NULL; + + scatterlist = sglist->scatterlist; + sg_init_table(scatterlist, num_elem); + sglist->order = order; + sglist->num_sg = num_elem; + sg_size = buflen; + + for (i = 0; i < num_elem; i++) { + page = alloc_pages(GFP_KERNEL|GFP_DMA, order); + if (!page) { + for (j = i - 1; j >= 0; j--) + __free_pages(sg_page(&scatterlist[j]), order); + kfree(sglist); + return NULL; + } + + sg_set_page(&scatterlist[i], page, + sg_size < bsize_elem ? sg_size : bsize_elem, 0); + sg_size -= bsize_elem; + } + + return sglist; +} + +/** + * pmcraid_copy_sglist - Copy user buffer to kernel buffer's SG list + * @sglist: scatter/gather list pointer + * @buffer: buffer pointer + * @len: buffer length + * @direction: data transfer direction + * + * Copy a user buffer into a buffer allocated by pmcraid_alloc_sglist + * + * Return value: + * 0 on success / other on failure + */ +static int pmcraid_copy_sglist( + struct pmcraid_sglist *sglist, + unsigned long buffer, + u32 len, + int direction +) +{ + struct scatterlist *scatterlist; + void *kaddr; + int bsize_elem; + int i; + int rc = 0; + + /* Determine the actual number of bytes per element */ + bsize_elem = PAGE_SIZE * (1 << sglist->order); + + scatterlist = sglist->scatterlist; + + for (i = 0; i < (len / bsize_elem); i++, buffer += bsize_elem) { + struct page *page = sg_page(&scatterlist[i]); + + kaddr = kmap(page); + if (direction == DMA_TO_DEVICE) + rc = __copy_from_user(kaddr, + (void *)buffer, + bsize_elem); + else + rc = __copy_to_user((void *)buffer, kaddr, bsize_elem); + + kunmap(page); + + if (rc) { + pmcraid_err("failed to copy user data into sg list\n"); + return -EFAULT; + } + + scatterlist[i].length = bsize_elem; + } + + if (len % bsize_elem) { + struct page *page = sg_page(&scatterlist[i]); + + kaddr = kmap(page); + + if (direction == DMA_TO_DEVICE) + rc = __copy_from_user(kaddr, + (void *)buffer, + len % bsize_elem); + else + rc = __copy_to_user((void *)buffer, + kaddr, + len % bsize_elem); + + kunmap(page); + + scatterlist[i].length = len % bsize_elem; + } + + if (rc) { + pmcraid_err("failed to copy user data into sg list\n"); + rc = -EFAULT; + } + + return rc; +} + +/** + * pmcraid_queuecommand - Queue a mid-layer request + * @scsi_cmd: scsi command struct + * @done: done function + * + * This function queues a request generated by the mid-layer. Midlayer calls + * this routine within host->lock. Some of the functions called by queuecommand + * would use cmd block queue locks (free_pool_lock and pending_pool_lock) + * + * Return value: + * 0 on success + * SCSI_MLQUEUE_DEVICE_BUSY if device is busy + * SCSI_MLQUEUE_HOST_BUSY if host is busy + */ +static int pmcraid_queuecommand( + struct scsi_cmnd *scsi_cmd, + void (*done) (struct scsi_cmnd *) +) +{ + struct pmcraid_instance *pinstance; + struct pmcraid_resource_entry *res; + struct pmcraid_ioarcb *ioarcb; + struct pmcraid_cmd *cmd; + int rc = 0; + + pinstance = + (struct pmcraid_instance *)scsi_cmd->device->host->hostdata; + + scsi_cmd->scsi_done = done; + res = scsi_cmd->device->hostdata; + scsi_cmd->result = (DID_OK << 16); + + /* if adapter is marked as dead, set result to DID_NO_CONNECT complete + * the command + */ + if (pinstance->ioa_state == IOA_STATE_DEAD) { + pmcraid_info("IOA is dead, but queuecommand is scheduled\n"); + scsi_cmd->result = (DID_NO_CONNECT << 16); + scsi_cmd->scsi_done(scsi_cmd); + return 0; + } + + /* If IOA reset is in progress, can't queue the commands */ + if (pinstance->ioa_reset_in_progress) + return SCSI_MLQUEUE_HOST_BUSY; + + /* initialize the command and IOARCB to be sent to IOA */ + cmd = pmcraid_get_free_cmd(pinstance); + + if (cmd == NULL) { + pmcraid_err("free command block is not available\n"); + return SCSI_MLQUEUE_HOST_BUSY; + } + + cmd->scsi_cmd = scsi_cmd; + ioarcb = &(cmd->ioa_cb->ioarcb); + memcpy(ioarcb->cdb, scsi_cmd->cmnd, scsi_cmd->cmd_len); + ioarcb->resource_handle = res->cfg_entry.resource_handle; + ioarcb->request_type = REQ_TYPE_SCSI; + + cmd->cmd_done = pmcraid_io_done; + + if (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry)) { + if (scsi_cmd->underflow == 0) + ioarcb->request_flags0 |= INHIBIT_UL_CHECK; + + if (res->sync_reqd) { + ioarcb->request_flags0 |= SYNC_COMPLETE; + res->sync_reqd = 0; + } + + ioarcb->request_flags0 |= NO_LINK_DESCS; + ioarcb->request_flags1 |= pmcraid_task_attributes(scsi_cmd); + + if (RES_IS_GSCSI(res->cfg_entry)) + ioarcb->request_flags1 |= DELAY_AFTER_RESET; + } + + rc = pmcraid_build_ioadl(pinstance, cmd); + + pmcraid_info("command (%d) CDB[0] = %x for %x:%x:%x:%x\n", + le32_to_cpu(ioarcb->response_handle) >> 2, + scsi_cmd->cmnd[0], pinstance->host->unique_id, + RES_IS_VSET(res->cfg_entry) ? PMCRAID_VSET_BUS_ID : + PMCRAID_PHYS_BUS_ID, + RES_IS_VSET(res->cfg_entry) ? + res->cfg_entry.unique_flags1 : + RES_TARGET(res->cfg_entry.resource_address), + RES_LUN(res->cfg_entry.resource_address)); + + if (likely(rc == 0)) { + _pmcraid_fire_command(cmd); + } else { + pmcraid_err("queuecommand could not build ioadl\n"); + pmcraid_return_cmd(cmd); + rc = SCSI_MLQUEUE_HOST_BUSY; + } + + return rc; +} + +/** + * pmcraid_open -char node "open" entry, allowed only users with admin access + */ +static int pmcraid_chr_open(struct inode *inode, struct file *filep) +{ + struct pmcraid_instance *pinstance; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + /* Populate adapter instance * pointer for use by ioctl */ + pinstance = container_of(inode->i_cdev, struct pmcraid_instance, cdev); + filep->private_data = pinstance; + + return 0; +} + +/** + * pmcraid_release - char node "release" entry point + */ +static int pmcraid_chr_release(struct inode *inode, struct file *filep) +{ + struct pmcraid_instance *pinstance = + ((struct pmcraid_instance *)filep->private_data); + + filep->private_data = NULL; + fasync_helper(-1, filep, 0, &pinstance->aen_queue); + + return 0; +} + +/** + * pmcraid_fasync - Async notifier registration from applications + * + * This function adds the calling process to a driver global queue. When an + * event occurs, SIGIO will be sent to all processes in this queue. + */ +static int pmcraid_chr_fasync(int fd, struct file *filep, int mode) +{ + struct pmcraid_instance *pinstance; + int rc; + + pinstance = (struct pmcraid_instance *)filep->private_data; + mutex_lock(&pinstance->aen_queue_lock); + rc = fasync_helper(fd, filep, mode, &pinstance->aen_queue); + mutex_unlock(&pinstance->aen_queue_lock); + + return rc; +} + + +/** + * pmcraid_build_passthrough_ioadls - builds SG elements for passthrough + * commands sent over IOCTL interface + * + * @cmd : pointer to struct pmcraid_cmd + * @buflen : length of the request buffer + * @direction : data transfer direction + * + * Return value + * 0 on sucess, non-zero error code on failure + */ +static int pmcraid_build_passthrough_ioadls( + struct pmcraid_cmd *cmd, + int buflen, + int direction +) +{ + struct pmcraid_sglist *sglist = NULL; + struct scatterlist *sg = NULL; + struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb; + struct pmcraid_ioadl_desc *ioadl; + int i; + + sglist = pmcraid_alloc_sglist(buflen); + + if (!sglist) { + pmcraid_err("can't allocate memory for passthrough SGls\n"); + return -ENOMEM; + } + + sglist->num_dma_sg = pci_map_sg(cmd->drv_inst->pdev, + sglist->scatterlist, + sglist->num_sg, direction); + + if (!sglist->num_dma_sg || sglist->num_dma_sg > PMCRAID_MAX_IOADLS) { + dev_err(&cmd->drv_inst->pdev->dev, + "Failed to map passthrough buffer!\n"); + pmcraid_free_sglist(sglist); + return -EIO; + } + + cmd->sglist = sglist; + ioarcb->request_flags0 |= NO_LINK_DESCS; + + ioadl = pmcraid_init_ioadls(cmd, sglist->num_dma_sg); + + /* Initialize IOADL descriptor addresses */ + for_each_sg(sglist->scatterlist, sg, sglist->num_dma_sg, i) { + ioadl[i].data_len = cpu_to_le32(sg_dma_len(sg)); + ioadl[i].address = cpu_to_le64(sg_dma_address(sg)); + ioadl[i].flags = 0; + } + + /* setup the last descriptor */ + ioadl[i - 1].flags = cpu_to_le32(IOADL_FLAGS_LAST_DESC); + + return 0; +} + + +/** + * pmcraid_release_passthrough_ioadls - release passthrough ioadls + * + * @cmd: pointer to struct pmcraid_cmd for which ioadls were allocated + * @buflen: size of the request buffer + * @direction: data transfer direction + * + * Return value + * 0 on sucess, non-zero error code on failure + */ +static void pmcraid_release_passthrough_ioadls( + struct pmcraid_cmd *cmd, + int buflen, + int direction +) +{ + struct pmcraid_sglist *sglist = cmd->sglist; + + if (buflen > 0) { + pci_unmap_sg(cmd->drv_inst->pdev, + sglist->scatterlist, + sglist->num_sg, + direction); + pmcraid_free_sglist(sglist); + cmd->sglist = NULL; + } +} + +/** + * pmcraid_ioctl_passthrough - handling passthrough IOCTL commands + * + * @pinstance: pointer to adapter instance structure + * @cmd: ioctl code + * @arg: pointer to pmcraid_passthrough_buffer user buffer + * + * Return value + * 0 on sucess, non-zero error code on failure + */ +static long pmcraid_ioctl_passthrough( + struct pmcraid_instance *pinstance, + unsigned int ioctl_cmd, + unsigned int buflen, + unsigned long arg +) +{ + struct pmcraid_passthrough_ioctl_buffer *buffer; + struct pmcraid_ioarcb *ioarcb; + struct pmcraid_cmd *cmd; + struct pmcraid_cmd *cancel_cmd; + unsigned long request_buffer; + unsigned long request_offset; + unsigned long lock_flags; + int request_size; + int buffer_size; + u8 access, direction; + int rc = 0; + + /* If IOA reset is in progress, wait 10 secs for reset to complete */ + if (pinstance->ioa_reset_in_progress) { + rc = wait_event_interruptible_timeout( + pinstance->reset_wait_q, + !pinstance->ioa_reset_in_progress, + msecs_to_jiffies(10000)); + + if (!rc) + return -ETIMEDOUT; + else if (rc < 0) + return -ERESTARTSYS; + } + + /* If adapter is not in operational state, return error */ + if (pinstance->ioa_state != IOA_STATE_OPERATIONAL) { + pmcraid_err("IOA is not operational\n"); + return -ENOTTY; + } + + buffer_size = sizeof(struct pmcraid_passthrough_ioctl_buffer); + buffer = kmalloc(buffer_size, GFP_KERNEL); + + if (!buffer) { + pmcraid_err("no memory for passthrough buffer\n"); + return -ENOMEM; + } + + request_offset = + offsetof(struct pmcraid_passthrough_ioctl_buffer, request_buffer); + + request_buffer = arg + request_offset; + + rc = __copy_from_user(buffer, + (struct pmcraid_passthrough_ioctl_buffer *) arg, + sizeof(struct pmcraid_passthrough_ioctl_buffer)); + if (rc) { + pmcraid_err("ioctl: can't copy passthrough buffer\n"); + rc = -EFAULT; + goto out_free_buffer; + } + + request_size = buffer->ioarcb.data_transfer_length; + + if (buffer->ioarcb.request_flags0 & TRANSFER_DIR_WRITE) { + access = VERIFY_READ; + direction = DMA_TO_DEVICE; + } else { + access = VERIFY_WRITE; + direction = DMA_FROM_DEVICE; + } + + if (request_size > 0) { + rc = access_ok(access, arg, request_offset + request_size); + + if (!rc) { + rc = -EFAULT; + goto out_free_buffer; + } + } + + /* check if we have any additional command parameters */ + if (buffer->ioarcb.add_cmd_param_length > PMCRAID_ADD_CMD_PARAM_LEN) { + rc = -EINVAL; + goto out_free_buffer; + } + + cmd = pmcraid_get_free_cmd(pinstance); + + if (!cmd) { + pmcraid_err("free command block is not available\n"); + rc = -ENOMEM; + goto out_free_buffer; + } + + cmd->scsi_cmd = NULL; + ioarcb = &(cmd->ioa_cb->ioarcb); + + /* Copy the user-provided IOARCB stuff field by field */ + ioarcb->resource_handle = buffer->ioarcb.resource_handle; + ioarcb->data_transfer_length = buffer->ioarcb.data_transfer_length; + ioarcb->cmd_timeout = buffer->ioarcb.cmd_timeout; + ioarcb->request_type = buffer->ioarcb.request_type; + ioarcb->request_flags0 = buffer->ioarcb.request_flags0; + ioarcb->request_flags1 = buffer->ioarcb.request_flags1; + memcpy(ioarcb->cdb, buffer->ioarcb.cdb, PMCRAID_MAX_CDB_LEN); + + if (buffer->ioarcb.add_cmd_param_length) { + ioarcb->add_cmd_param_length = + buffer->ioarcb.add_cmd_param_length; + ioarcb->add_cmd_param_offset = + buffer->ioarcb.add_cmd_param_offset; + memcpy(ioarcb->add_data.u.add_cmd_params, + buffer->ioarcb.add_data.u.add_cmd_params, + buffer->ioarcb.add_cmd_param_length); + } + + if (request_size) { + rc = pmcraid_build_passthrough_ioadls(cmd, + request_size, + direction); + if (rc) { + pmcraid_err("couldn't build passthrough ioadls\n"); + goto out_free_buffer; + } + } + + /* If data is being written into the device, copy the data from user + * buffers + */ + if (direction == DMA_TO_DEVICE && request_size > 0) { + rc = pmcraid_copy_sglist(cmd->sglist, + request_buffer, + request_size, + direction); + if (rc) { + pmcraid_err("failed to copy user buffer\n"); + goto out_free_sglist; + } + } + + /* passthrough ioctl is a blocking command so, put the user to sleep + * until timeout. Note that a timeout value of 0 means, do timeout. + */ + cmd->cmd_done = pmcraid_internal_done; + init_completion(&cmd->wait_for_completion); + cmd->completion_req = 1; + + pmcraid_info("command(%d) (CDB[0] = %x) for %x\n", + le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2, + cmd->ioa_cb->ioarcb.cdb[0], + le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle)); + + spin_lock_irqsave(pinstance->host->host_lock, lock_flags); + _pmcraid_fire_command(cmd); + spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags); + + /* If command timeout is specified put caller to wait till that time, + * otherwise it would be blocking wait. If command gets timed out, it + * will be aborted. + */ + if (buffer->ioarcb.cmd_timeout == 0) { + wait_for_completion(&cmd->wait_for_completion); + } else if (!wait_for_completion_timeout( + &cmd->wait_for_completion, + msecs_to_jiffies(buffer->ioarcb.cmd_timeout * 1000))) { + + pmcraid_info("aborting cmd %d (CDB[0] = %x) due to timeout\n", + le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle >> 2), + cmd->ioa_cb->ioarcb.cdb[0]); + + rc = -ETIMEDOUT; + spin_lock_irqsave(pinstance->host->host_lock, lock_flags); + cancel_cmd = pmcraid_abort_cmd(cmd); + spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags); + + if (cancel_cmd) { + wait_for_completion(&cancel_cmd->wait_for_completion); + pmcraid_return_cmd(cancel_cmd); + } + + goto out_free_sglist; + } + + /* If the command failed for any reason, copy entire IOASA buffer and + * return IOCTL success. If copying IOASA to user-buffer fails, return + * EFAULT + */ + if (le32_to_cpu(cmd->ioa_cb->ioasa.ioasc)) { + + void *ioasa = + (void *)(arg + + offsetof(struct pmcraid_passthrough_ioctl_buffer, ioasa)); + + pmcraid_info("command failed with %x\n", + le32_to_cpu(cmd->ioa_cb->ioasa.ioasc)); + if (copy_to_user(ioasa, &cmd->ioa_cb->ioasa, + sizeof(struct pmcraid_ioasa))) { + pmcraid_err("failed to copy ioasa buffer to user\n"); + rc = -EFAULT; + } + } + /* If the data transfer was from device, copy the data onto user + * buffers + */ + else if (direction == DMA_FROM_DEVICE && request_size > 0) { + rc = pmcraid_copy_sglist(cmd->sglist, + request_buffer, + request_size, + direction); + if (rc) { + pmcraid_err("failed to copy user buffer\n"); + rc = -EFAULT; + } + } + +out_free_sglist: + pmcraid_release_passthrough_ioadls(cmd, request_size, direction); + pmcraid_return_cmd(cmd); + +out_free_buffer: + kfree(buffer); + + return rc; +} + + + + +/** + * pmcraid_ioctl_driver - ioctl handler for commands handled by driver itself + * + * @pinstance: pointer to adapter instance structure + * @cmd: ioctl command passed in + * @buflen: length of user_buffer + * @user_buffer: user buffer pointer + * + * Return Value + * 0 in case of success, otherwise appropriate error code + */ +static long pmcraid_ioctl_driver( + struct pmcraid_instance *pinstance, + unsigned int cmd, + unsigned int buflen, + void __user *user_buffer +) +{ + int rc = -ENOSYS; + + if (!access_ok(VERIFY_READ, user_buffer, _IOC_SIZE(cmd))) { + pmcraid_err("ioctl_driver: access fault in request buffer \n"); + return -EFAULT; + } + + switch (cmd) { + case PMCRAID_IOCTL_RESET_ADAPTER: + pmcraid_reset_bringup(pinstance); + rc = 0; + break; + + default: + break; + } + + return rc; +} + +/** + * pmcraid_check_ioctl_buffer - check for proper access to user buffer + * + * @cmd: ioctl command + * @arg: user buffer + * @hdr: pointer to kernel memory for pmcraid_ioctl_header + * + * Return Value + * negetive error code if there are access issues, otherwise zero. + * Upon success, returns ioctl header copied out of user buffer. + */ + +static int pmcraid_check_ioctl_buffer( + int cmd, + void __user *arg, + struct pmcraid_ioctl_header *hdr +) +{ + int rc = 0; + int access = VERIFY_READ; + + if (copy_from_user(hdr, arg, sizeof(struct pmcraid_ioctl_header))) { + pmcraid_err("couldn't copy ioctl header from user buffer\n"); + return -EFAULT; + } + + /* check for valid driver signature */ + rc = memcmp(hdr->signature, + PMCRAID_IOCTL_SIGNATURE, + sizeof(hdr->signature)); + if (rc) { + pmcraid_err("signature verification failed\n"); + return -EINVAL; + } + + /* buffer length can't be negetive */ + if (hdr->buffer_length < 0) { + pmcraid_err("ioctl: invalid buffer length specified\n"); + return -EINVAL; + } + + /* check for appropriate buffer access */ + if ((_IOC_DIR(cmd) & _IOC_READ) == _IOC_READ) + access = VERIFY_WRITE; + + rc = access_ok(access, + (arg + sizeof(struct pmcraid_ioctl_header)), + hdr->buffer_length); + if (!rc) { + pmcraid_err("access failed for user buffer of size %d\n", + hdr->buffer_length); + return -EFAULT; + } + + return 0; +} + +/** + * pmcraid_ioctl - char node ioctl entry point + */ +static long pmcraid_chr_ioctl( + struct file *filep, + unsigned int cmd, + unsigned long arg +) +{ + struct pmcraid_instance *pinstance = NULL; + struct pmcraid_ioctl_header *hdr = NULL; + int retval = -ENOTTY; + + hdr = kmalloc(GFP_KERNEL, sizeof(struct pmcraid_ioctl_header)); + + if (!hdr) { + pmcraid_err("faile to allocate memory for ioctl header\n"); + return -ENOMEM; + } + + retval = pmcraid_check_ioctl_buffer(cmd, (void *)arg, hdr); + + if (retval) { + pmcraid_info("chr_ioctl: header check failed\n"); + kfree(hdr); + return retval; + } + + pinstance = (struct pmcraid_instance *)filep->private_data; + + if (!pinstance) { + pmcraid_info("adapter instance is not found\n"); + kfree(hdr); + return -ENOTTY; + } + + switch (_IOC_TYPE(cmd)) { + + case PMCRAID_PASSTHROUGH_IOCTL: + /* If ioctl code is to download microcode, we need to block + * mid-layer requests. + */ + if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE) + scsi_block_requests(pinstance->host); + + retval = pmcraid_ioctl_passthrough(pinstance, + cmd, + hdr->buffer_length, + arg); + + if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE) + scsi_unblock_requests(pinstance->host); + break; + + case PMCRAID_DRIVER_IOCTL: + arg += sizeof(struct pmcraid_ioctl_header); + retval = pmcraid_ioctl_driver(pinstance, + cmd, + hdr->buffer_length, + (void __user *)arg); + break; + + default: + retval = -ENOTTY; + break; + } + + kfree(hdr); + + return retval; +} + +/** + * File operations structure for management interface + */ +static const struct file_operations pmcraid_fops = { + .owner = THIS_MODULE, + .open = pmcraid_chr_open, + .release = pmcraid_chr_release, + .fasync = pmcraid_chr_fasync, + .unlocked_ioctl = pmcraid_chr_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = pmcraid_chr_ioctl, +#endif +}; + + + + +/** + * pmcraid_show_log_level - Display adapter's error logging level + * @dev: class device struct + * @buf: buffer + * + * Return value: + * number of bytes printed to buffer + */ +static ssize_t pmcraid_show_log_level( + struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct pmcraid_instance *pinstance = + (struct pmcraid_instance *)shost->hostdata; + return snprintf(buf, PAGE_SIZE, "%d\n", pinstance->current_log_level); +} + +/** + * pmcraid_store_log_level - Change the adapter's error logging level + * @dev: class device struct + * @buf: buffer + * @count: not used + * + * Return value: + * number of bytes printed to buffer + */ +static ssize_t pmcraid_store_log_level( + struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t count +) +{ + struct Scsi_Host *shost; + struct pmcraid_instance *pinstance; + unsigned long val; + + if (strict_strtoul(buf, 10, &val)) + return -EINVAL; + /* log-level should be from 0 to 2 */ + if (val > 2) + return -EINVAL; + + shost = class_to_shost(dev); + pinstance = (struct pmcraid_instance *)shost->hostdata; + pinstance->current_log_level = val; + + return strlen(buf); +} + +static struct device_attribute pmcraid_log_level_attr = { + .attr = { + .name = "log_level", + .mode = S_IRUGO | S_IWUSR, + }, + .show = pmcraid_show_log_level, + .store = pmcraid_store_log_level, +}; + +/** + * pmcraid_show_drv_version - Display driver version + * @dev: class device struct + * @buf: buffer + * + * Return value: + * number of bytes printed to buffer + */ +static ssize_t pmcraid_show_drv_version( + struct device *dev, + struct device_attribute *attr, + char *buf +) +{ + return snprintf(buf, PAGE_SIZE, "version: %s, build date: %s\n", + PMCRAID_DRIVER_VERSION, PMCRAID_DRIVER_DATE); +} + +static struct device_attribute pmcraid_driver_version_attr = { + .attr = { + .name = "drv_version", + .mode = S_IRUGO, + }, + .show = pmcraid_show_drv_version, +}; + +/** + * pmcraid_show_io_adapter_id - Display driver assigned adapter id + * @dev: class device struct + * @buf: buffer + * + * Return value: + * number of bytes printed to buffer + */ +static ssize_t pmcraid_show_adapter_id( + struct device *dev, + struct device_attribute *attr, + char *buf +) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct pmcraid_instance *pinstance = + (struct pmcraid_instance *)shost->hostdata; + u32 adapter_id = (pinstance->pdev->bus->number << 8) | + pinstance->pdev->devfn; + u32 aen_group = pmcraid_event_family.id; + + return snprintf(buf, PAGE_SIZE, + "adapter id: %d\nminor: %d\naen group: %d\n", + adapter_id, MINOR(pinstance->cdev.dev), aen_group); +} + +static struct device_attribute pmcraid_adapter_id_attr = { + .attr = { + .name = "adapter_id", + .mode = S_IRUGO | S_IWUSR, + }, + .show = pmcraid_show_adapter_id, +}; + +static struct device_attribute *pmcraid_host_attrs[] = { + &pmcraid_log_level_attr, + &pmcraid_driver_version_attr, + &pmcraid_adapter_id_attr, + NULL, +}; + + +/* host template structure for pmcraid driver */ +static struct scsi_host_template pmcraid_host_template = { + .module = THIS_MODULE, + .name = PMCRAID_DRIVER_NAME, + .queuecommand = pmcraid_queuecommand, + .eh_abort_handler = pmcraid_eh_abort_handler, + .eh_bus_reset_handler = pmcraid_eh_bus_reset_handler, + .eh_target_reset_handler = pmcraid_eh_target_reset_handler, + .eh_device_reset_handler = pmcraid_eh_device_reset_handler, + .eh_host_reset_handler = pmcraid_eh_host_reset_handler, + + .slave_alloc = pmcraid_slave_alloc, + .slave_configure = pmcraid_slave_configure, + .slave_destroy = pmcraid_slave_destroy, + .change_queue_depth = pmcraid_change_queue_depth, + .change_queue_type = pmcraid_change_queue_type, + .can_queue = PMCRAID_MAX_IO_CMD, + .this_id = -1, + .sg_tablesize = PMCRAID_MAX_IOADLS, + .max_sectors = PMCRAID_IOA_MAX_SECTORS, + .cmd_per_lun = PMCRAID_MAX_CMD_PER_LUN, + .use_clustering = ENABLE_CLUSTERING, + .shost_attrs = pmcraid_host_attrs, + .proc_name = PMCRAID_DRIVER_NAME +}; + +/** + * pmcraid_isr_common - Common interrupt handler routine + * + * @pinstance: pointer to adapter instance + * @intrs: active interrupts (contents of ioa_host_interrupt register) + * @hrrq_id: Host RRQ index + * + * Return Value + * none + */ +static void pmcraid_isr_common( + struct pmcraid_instance *pinstance, + u32 intrs, + int hrrq_id +) +{ + u32 intrs_clear = + (intrs & INTRS_CRITICAL_OP_IN_PROGRESS) ? intrs + : INTRS_HRRQ_VALID; + iowrite32(intrs_clear, + pinstance->int_regs.ioa_host_interrupt_clr_reg); + intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg); + + /* hrrq valid bit was set, schedule tasklet to handle the response */ + if (intrs_clear == INTRS_HRRQ_VALID) + tasklet_schedule(&(pinstance->isr_tasklet[hrrq_id])); +} + +/** + * pmcraid_isr - implements interrupt handling routine + * + * @irq: interrupt vector number + * @dev_id: pointer hrrq_vector + * + * Return Value + * IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored + */ +static irqreturn_t pmcraid_isr(int irq, void *dev_id) +{ + struct pmcraid_isr_param *hrrq_vector; + struct pmcraid_instance *pinstance; + unsigned long lock_flags; + u32 intrs; + + /* In case of legacy interrupt mode where interrupts are shared across + * isrs, it may be possible that the current interrupt is not from IOA + */ + if (!dev_id) { + printk(KERN_INFO "%s(): NULL host pointer\n", __func__); + return IRQ_NONE; + } + + hrrq_vector = (struct pmcraid_isr_param *)dev_id; + pinstance = hrrq_vector->drv_inst; + + /* Acquire the lock (currently host_lock) while processing interrupts. + * This interval is small as most of the response processing is done by + * tasklet without the lock. + */ + spin_lock_irqsave(pinstance->host->host_lock, lock_flags); + intrs = pmcraid_read_interrupts(pinstance); + + if (unlikely((intrs & PMCRAID_PCI_INTERRUPTS) == 0)) { + spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags); + return IRQ_NONE; + } + + /* Any error interrupts including unit_check, initiate IOA reset. + * In case of unit check indicate to reset_sequence that IOA unit + * checked and prepare for a dump during reset sequence + */ + if (intrs & PMCRAID_ERROR_INTERRUPTS) { + + if (intrs & INTRS_IOA_UNIT_CHECK) + pinstance->ioa_unit_check = 1; + + iowrite32(intrs, + pinstance->int_regs.ioa_host_interrupt_clr_reg); + pmcraid_err("ISR: error interrupts: %x initiating reset\n", + intrs); + intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg); + pmcraid_initiate_reset(pinstance); + } else { + pmcraid_isr_common(pinstance, intrs, hrrq_vector->hrrq_id); + } + + spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags); + + return IRQ_HANDLED; +} + + +/** + * pmcraid_worker_function - worker thread function + * + * @workp: pointer to struct work queue + * + * Return Value + * None + */ + +static void pmcraid_worker_function(struct work_struct *workp) +{ + struct pmcraid_instance *pinstance; + struct pmcraid_resource_entry *res; + struct pmcraid_resource_entry *temp; + struct scsi_device *sdev; + unsigned long lock_flags; + unsigned long host_lock_flags; + u8 bus, target, lun; + + pinstance = container_of(workp, struct pmcraid_instance, worker_q); + /* add resources only after host is added into system */ + if (!atomic_read(&pinstance->expose_resources)) + return; + + spin_lock_irqsave(&pinstance->resource_lock, lock_flags); + list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue) { + + if (res->change_detected == RES_CHANGE_DEL && res->scsi_dev) { + sdev = res->scsi_dev; + + /* host_lock must be held before calling + * scsi_device_get + */ + spin_lock_irqsave(pinstance->host->host_lock, + host_lock_flags); + if (!scsi_device_get(sdev)) { + spin_unlock_irqrestore( + pinstance->host->host_lock, + host_lock_flags); + pmcraid_info("deleting %x from midlayer\n", + res->cfg_entry.resource_address); + list_move_tail(&res->queue, + &pinstance->free_res_q); + spin_unlock_irqrestore( + &pinstance->resource_lock, + lock_flags); + scsi_remove_device(sdev); + scsi_device_put(sdev); + spin_lock_irqsave(&pinstance->resource_lock, + lock_flags); + res->change_detected = 0; + } else { + spin_unlock_irqrestore( + pinstance->host->host_lock, + host_lock_flags); + } + } + } + + list_for_each_entry(res, &pinstance->used_res_q, queue) { + + if (res->change_detected == RES_CHANGE_ADD) { + + if (!pmcraid_expose_resource(&res->cfg_entry)) + continue; + + if (RES_IS_VSET(res->cfg_entry)) { + bus = PMCRAID_VSET_BUS_ID; + target = res->cfg_entry.unique_flags1; + lun = PMCRAID_VSET_LUN_ID; + } else { + bus = PMCRAID_PHYS_BUS_ID; + target = + RES_TARGET( + res->cfg_entry.resource_address); + lun = RES_LUN(res->cfg_entry.resource_address); + } + + res->change_detected = 0; + spin_unlock_irqrestore(&pinstance->resource_lock, + lock_flags); + scsi_add_device(pinstance->host, bus, target, lun); + spin_lock_irqsave(&pinstance->resource_lock, + lock_flags); + } + } + + spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags); +} + +/** + * pmcraid_tasklet_function - Tasklet function + * + * @instance: pointer to msix param structure + * + * Return Value + * None + */ +void pmcraid_tasklet_function(unsigned long instance) +{ + struct pmcraid_isr_param *hrrq_vector; + struct pmcraid_instance *pinstance; + unsigned long hrrq_lock_flags; + unsigned long pending_lock_flags; + unsigned long host_lock_flags; + spinlock_t *lockp; /* hrrq buffer lock */ + int id; + u32 intrs; + __le32 resp; + + hrrq_vector = (struct pmcraid_isr_param *)instance; + pinstance = hrrq_vector->drv_inst; + id = hrrq_vector->hrrq_id; + lockp = &(pinstance->hrrq_lock[id]); + intrs = pmcraid_read_interrupts(pinstance); + + /* If interrupts was as part of the ioa initialization, clear and mask + * it. Delete the timer and wakeup the reset engine to proceed with + * reset sequence + */ + if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) { + iowrite32(INTRS_TRANSITION_TO_OPERATIONAL, + pinstance->int_regs.ioa_host_interrupt_mask_reg); + iowrite32(INTRS_TRANSITION_TO_OPERATIONAL, + pinstance->int_regs.ioa_host_interrupt_clr_reg); + + if (pinstance->reset_cmd != NULL) { + del_timer(&pinstance->reset_cmd->timer); + spin_lock_irqsave(pinstance->host->host_lock, + host_lock_flags); + pinstance->reset_cmd->cmd_done(pinstance->reset_cmd); + spin_unlock_irqrestore(pinstance->host->host_lock, + host_lock_flags); + } + return; + } + + /* loop through each of the commands responded by IOA. Each HRRQ buf is + * protected by its own lock. Traversals must be done within this lock + * as there may be multiple tasklets running on multiple CPUs. Note + * that the lock is held just for picking up the response handle and + * manipulating hrrq_curr/toggle_bit values. + */ + spin_lock_irqsave(lockp, hrrq_lock_flags); + + resp = le32_to_cpu(*(pinstance->hrrq_curr[id])); + + while ((resp & HRRQ_TOGGLE_BIT) == + pinstance->host_toggle_bit[id]) { + + int cmd_index = resp >> 2; + struct pmcraid_cmd *cmd = NULL; + + if (cmd_index < PMCRAID_MAX_CMD) { + cmd = pinstance->cmd_list[cmd_index]; + } else { + /* In case of invalid response handle, initiate IOA + * reset sequence. + */ + spin_unlock_irqrestore(lockp, hrrq_lock_flags); + + pmcraid_err("Invalid response %d initiating reset\n", + cmd_index); + + spin_lock_irqsave(pinstance->host->host_lock, + host_lock_flags); + pmcraid_initiate_reset(pinstance); + spin_unlock_irqrestore(pinstance->host->host_lock, + host_lock_flags); + + spin_lock_irqsave(lockp, hrrq_lock_flags); + break; + } + + if (pinstance->hrrq_curr[id] < pinstance->hrrq_end[id]) { + pinstance->hrrq_curr[id]++; + } else { + pinstance->hrrq_curr[id] = pinstance->hrrq_start[id]; + pinstance->host_toggle_bit[id] ^= 1u; + } + + spin_unlock_irqrestore(lockp, hrrq_lock_flags); + + spin_lock_irqsave(&pinstance->pending_pool_lock, + pending_lock_flags); + list_del(&cmd->free_list); + spin_unlock_irqrestore(&pinstance->pending_pool_lock, + pending_lock_flags); + del_timer(&cmd->timer); + atomic_dec(&pinstance->outstanding_cmds); + + if (cmd->cmd_done == pmcraid_ioa_reset) { + spin_lock_irqsave(pinstance->host->host_lock, + host_lock_flags); + cmd->cmd_done(cmd); + spin_unlock_irqrestore(pinstance->host->host_lock, + host_lock_flags); + } else if (cmd->cmd_done != NULL) { + cmd->cmd_done(cmd); + } + /* loop over until we are done with all responses */ + spin_lock_irqsave(lockp, hrrq_lock_flags); + resp = le32_to_cpu(*(pinstance->hrrq_curr[id])); + } + + spin_unlock_irqrestore(lockp, hrrq_lock_flags); +} + +/** + * pmcraid_unregister_interrupt_handler - de-register interrupts handlers + * @pinstance: pointer to adapter instance structure + * + * This routine un-registers registered interrupt handler and + * also frees irqs/vectors. + * + * Retun Value + * None + */ +static +void pmcraid_unregister_interrupt_handler(struct pmcraid_instance *pinstance) +{ + free_irq(pinstance->pdev->irq, &(pinstance->hrrq_vector[0])); +} + +/** + * pmcraid_register_interrupt_handler - registers interrupt handler + * @pinstance: pointer to per-adapter instance structure + * + * Return Value + * 0 on success, non-zero error code otherwise. + */ +static int +pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance) +{ + struct pci_dev *pdev = pinstance->pdev; + + pinstance->hrrq_vector[0].hrrq_id = 0; + pinstance->hrrq_vector[0].drv_inst = pinstance; + pinstance->hrrq_vector[0].vector = 0; + pinstance->num_hrrq = 1; + return request_irq(pdev->irq, pmcraid_isr, IRQF_SHARED, + PMCRAID_DRIVER_NAME, &pinstance->hrrq_vector[0]); +} + +/** + * pmcraid_release_cmd_blocks - release buufers allocated for command blocks + * @pinstance: per adapter instance structure pointer + * @max_index: number of buffer blocks to release + * + * Return Value + * None + */ +static void +pmcraid_release_cmd_blocks(struct pmcraid_instance *pinstance, int max_index) +{ + int i; + for (i = 0; i < max_index; i++) { + kmem_cache_free(pinstance->cmd_cachep, pinstance->cmd_list[i]); + pinstance->cmd_list[i] = NULL; + } + kmem_cache_destroy(pinstance->cmd_cachep); + pinstance->cmd_cachep = NULL; +} + +/** + * pmcraid_release_control_blocks - releases buffers alloced for control blocks + * @pinstance: pointer to per adapter instance structure + * @max_index: number of buffers (from 0 onwards) to release + * + * This function assumes that the command blocks for which control blocks are + * linked are not released. + * + * Return Value + * None + */ +static void +pmcraid_release_control_blocks( + struct pmcraid_instance *pinstance, + int max_index +) +{ + int i; + + if (pinstance->control_pool == NULL) + return; + + for (i = 0; i < max_index; i++) { + pci_pool_free(pinstance->control_pool, + pinstance->cmd_list[i]->ioa_cb, + pinstance->cmd_list[i]->ioa_cb_bus_addr); + pinstance->cmd_list[i]->ioa_cb = NULL; + pinstance->cmd_list[i]->ioa_cb_bus_addr = 0; + } + pci_pool_destroy(pinstance->control_pool); + pinstance->control_pool = NULL; +} + +/** + * pmcraid_allocate_cmd_blocks - allocate memory for cmd block structures + * @pinstance - pointer to per adapter instance structure + * + * Allocates memory for command blocks using kernel slab allocator. + * + * Return Value + * 0 in case of success; -ENOMEM in case of failure + */ +static int __devinit +pmcraid_allocate_cmd_blocks(struct pmcraid_instance *pinstance) +{ + int i; + + sprintf(pinstance->cmd_pool_name, "pmcraid_cmd_pool_%d", + pinstance->host->unique_id); + + + pinstance->cmd_cachep = kmem_cache_create( + pinstance->cmd_pool_name, + sizeof(struct pmcraid_cmd), 0, + SLAB_HWCACHE_ALIGN, NULL); + if (!pinstance->cmd_cachep) + return -ENOMEM; + + for (i = 0; i < PMCRAID_MAX_CMD; i++) { + pinstance->cmd_list[i] = + kmem_cache_alloc(pinstance->cmd_cachep, GFP_KERNEL); + if (!pinstance->cmd_list[i]) { + pmcraid_release_cmd_blocks(pinstance, i); + return -ENOMEM; + } + } + return 0; +} + +/** + * pmcraid_allocate_control_blocks - allocates memory control blocks + * @pinstance : pointer to per adapter instance structure + * + * This function allocates PCI memory for DMAable buffers like IOARCB, IOADLs + * and IOASAs. This is called after command blocks are already allocated. + * + * Return Value + * 0 in case it can allocate all control blocks, otherwise -ENOMEM + */ +static int __devinit +pmcraid_allocate_control_blocks(struct pmcraid_instance *pinstance) +{ + int i; + + sprintf(pinstance->ctl_pool_name, "pmcraid_control_pool_%d", + pinstance->host->unique_id); + + pinstance->control_pool = + pci_pool_create(pinstance->ctl_pool_name, + pinstance->pdev, + sizeof(struct pmcraid_control_block), + PMCRAID_IOARCB_ALIGNMENT, 0); + + if (!pinstance->control_pool) + return -ENOMEM; + + for (i = 0; i < PMCRAID_MAX_CMD; i++) { + pinstance->cmd_list[i]->ioa_cb = + pci_pool_alloc( + pinstance->control_pool, + GFP_KERNEL, + &(pinstance->cmd_list[i]->ioa_cb_bus_addr)); + + if (!pinstance->cmd_list[i]->ioa_cb) { + pmcraid_release_control_blocks(pinstance, i); + return -ENOMEM; + } + memset(pinstance->cmd_list[i]->ioa_cb, 0, + sizeof(struct pmcraid_control_block)); + } + return 0; +} + +/** + * pmcraid_release_host_rrqs - release memory allocated for hrrq buffer(s) + * @pinstance: pointer to per adapter instance structure + * @maxindex: size of hrrq buffer pointer array + * + * Return Value + * None + */ +static void +pmcraid_release_host_rrqs(struct pmcraid_instance *pinstance, int maxindex) +{ + int i; + for (i = 0; i < maxindex; i++) { + + pci_free_consistent(pinstance->pdev, + HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD, + pinstance->hrrq_start[i], + pinstance->hrrq_start_bus_addr[i]); + + /* reset pointers and toggle bit to zeros */ + pinstance->hrrq_start[i] = NULL; + pinstance->hrrq_start_bus_addr[i] = 0; + pinstance->host_toggle_bit[i] = 0; + } +} + +/** + * pmcraid_allocate_host_rrqs - Allocate and initialize host RRQ buffers + * @pinstance: pointer to per adapter instance structure + * + * Return value + * 0 hrrq buffers are allocated, -ENOMEM otherwise. + */ +static int __devinit +pmcraid_allocate_host_rrqs(struct pmcraid_instance *pinstance) +{ + int i; + int buf_count = PMCRAID_MAX_CMD / pinstance->num_hrrq; + + for (i = 0; i < pinstance->num_hrrq; i++) { + int buffer_size = HRRQ_ENTRY_SIZE * buf_count; + + pinstance->hrrq_start[i] = + pci_alloc_consistent( + pinstance->pdev, + buffer_size, + &(pinstance->hrrq_start_bus_addr[i])); + + if (pinstance->hrrq_start[i] == 0) { + pmcraid_err("could not allocate host rrq: %d\n", i); + pmcraid_release_host_rrqs(pinstance, i); + return -ENOMEM; + } + + memset(pinstance->hrrq_start[i], 0, buffer_size); + pinstance->hrrq_curr[i] = pinstance->hrrq_start[i]; + pinstance->hrrq_end[i] = + pinstance->hrrq_start[i] + buf_count - 1; + pinstance->host_toggle_bit[i] = 1; + spin_lock_init(&pinstance->hrrq_lock[i]); + } + return 0; +} + +/** + * pmcraid_release_hcams - release HCAM buffers + * + * @pinstance: pointer to per adapter instance structure + * + * Return value + * none + */ +static void pmcraid_release_hcams(struct pmcraid_instance *pinstance) +{ + if (pinstance->ccn.msg != NULL) { + pci_free_consistent(pinstance->pdev, + PMCRAID_AEN_HDR_SIZE + + sizeof(struct pmcraid_hcam_ccn), + pinstance->ccn.msg, + pinstance->ccn.baddr); + + pinstance->ccn.msg = NULL; + pinstance->ccn.hcam = NULL; + pinstance->ccn.baddr = 0; + } + + if (pinstance->ldn.msg != NULL) { + pci_free_consistent(pinstance->pdev, + PMCRAID_AEN_HDR_SIZE + + sizeof(struct pmcraid_hcam_ldn), + pinstance->ldn.msg, + pinstance->ldn.baddr); + + pinstance->ldn.msg = NULL; + pinstance->ldn.hcam = NULL; + pinstance->ldn.baddr = 0; + } +} + +/** + * pmcraid_allocate_hcams - allocates HCAM buffers + * @pinstance : pointer to per adapter instance structure + * + * Return Value: + * 0 in case of successful allocation, non-zero otherwise + */ +static int pmcraid_allocate_hcams(struct pmcraid_instance *pinstance) +{ + pinstance->ccn.msg = pci_alloc_consistent( + pinstance->pdev, + PMCRAID_AEN_HDR_SIZE + + sizeof(struct pmcraid_hcam_ccn), + &(pinstance->ccn.baddr)); + + pinstance->ldn.msg = pci_alloc_consistent( + pinstance->pdev, + PMCRAID_AEN_HDR_SIZE + + sizeof(struct pmcraid_hcam_ldn), + &(pinstance->ldn.baddr)); + + if (pinstance->ldn.msg == NULL || pinstance->ccn.msg == NULL) { + pmcraid_release_hcams(pinstance); + } else { + pinstance->ccn.hcam = + (void *)pinstance->ccn.msg + PMCRAID_AEN_HDR_SIZE; + pinstance->ldn.hcam = + (void *)pinstance->ldn.msg + PMCRAID_AEN_HDR_SIZE; + + atomic_set(&pinstance->ccn.ignore, 0); + atomic_set(&pinstance->ldn.ignore, 0); + } + + return (pinstance->ldn.msg == NULL) ? -ENOMEM : 0; +} + +/** + * pmcraid_release_config_buffers - release config.table buffers + * @pinstance: pointer to per adapter instance structure + * + * Return Value + * none + */ +static void pmcraid_release_config_buffers(struct pmcraid_instance *pinstance) +{ + if (pinstance->cfg_table != NULL && + pinstance->cfg_table_bus_addr != 0) { + pci_free_consistent(pinstance->pdev, + sizeof(struct pmcraid_config_table), + pinstance->cfg_table, + pinstance->cfg_table_bus_addr); + pinstance->cfg_table = NULL; + pinstance->cfg_table_bus_addr = 0; + } + + if (pinstance->res_entries != NULL) { + int i; + + for (i = 0; i < PMCRAID_MAX_RESOURCES; i++) + list_del(&pinstance->res_entries[i].queue); + kfree(pinstance->res_entries); + pinstance->res_entries = NULL; + } + + pmcraid_release_hcams(pinstance); +} + +/** + * pmcraid_allocate_config_buffers - allocates DMAable memory for config table + * @pinstance : pointer to per adapter instance structure + * + * Return Value + * 0 for successful allocation, -ENOMEM for any failure + */ +static int __devinit +pmcraid_allocate_config_buffers(struct pmcraid_instance *pinstance) +{ + int i; + + pinstance->res_entries = + kzalloc(sizeof(struct pmcraid_resource_entry) * + PMCRAID_MAX_RESOURCES, GFP_KERNEL); + + if (NULL == pinstance->res_entries) { + pmcraid_err("failed to allocate memory for resource table\n"); + return -ENOMEM; + } + + for (i = 0; i < PMCRAID_MAX_RESOURCES; i++) + list_add_tail(&pinstance->res_entries[i].queue, + &pinstance->free_res_q); + + pinstance->cfg_table = + pci_alloc_consistent(pinstance->pdev, + sizeof(struct pmcraid_config_table), + &pinstance->cfg_table_bus_addr); + + if (NULL == pinstance->cfg_table) { + pmcraid_err("couldn't alloc DMA memory for config table\n"); + pmcraid_release_config_buffers(pinstance); + return -ENOMEM; + } + + if (pmcraid_allocate_hcams(pinstance)) { + pmcraid_err("could not alloc DMA memory for HCAMS\n"); + pmcraid_release_config_buffers(pinstance); + return -ENOMEM; + } + + return 0; +} + +/** + * pmcraid_init_tasklets - registers tasklets for response handling + * + * @pinstance: pointer adapter instance structure + * + * Return value + * none + */ +static void pmcraid_init_tasklets(struct pmcraid_instance *pinstance) +{ + int i; + for (i = 0; i < pinstance->num_hrrq; i++) + tasklet_init(&pinstance->isr_tasklet[i], + pmcraid_tasklet_function, + (unsigned long)&pinstance->hrrq_vector[i]); +} + +/** + * pmcraid_kill_tasklets - destroys tasklets registered for response handling + * + * @pinstance: pointer to adapter instance structure + * + * Return value + * none + */ +static void pmcraid_kill_tasklets(struct pmcraid_instance *pinstance) +{ + int i; + for (i = 0; i < pinstance->num_hrrq; i++) + tasklet_kill(&pinstance->isr_tasklet[i]); +} + +/** + * pmcraid_init_buffers - allocates memory and initializes various structures + * @pinstance: pointer to per adapter instance structure + * + * This routine pre-allocates memory based on the type of block as below: + * cmdblocks(PMCRAID_MAX_CMD): kernel memory using kernel's slab_allocator, + * IOARCBs(PMCRAID_MAX_CMD) : DMAable memory, using pci pool allocator + * config-table entries : DMAable memory using pci_alloc_consistent + * HostRRQs : DMAable memory, using pci_alloc_consistent + * + * Return Value + * 0 in case all of the blocks are allocated, -ENOMEM otherwise. + */ +static int __devinit pmcraid_init_buffers(struct pmcraid_instance *pinstance) +{ + int i; + + if (pmcraid_allocate_host_rrqs(pinstance)) { + pmcraid_err("couldn't allocate memory for %d host rrqs\n", + pinstance->num_hrrq); + return -ENOMEM; + } + + if (pmcraid_allocate_config_buffers(pinstance)) { + pmcraid_err("couldn't allocate memory for config buffers\n"); + pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq); + return -ENOMEM; + } + + if (pmcraid_allocate_cmd_blocks(pinstance)) { + pmcraid_err("couldn't allocate memory for cmd blocks \n"); + pmcraid_release_config_buffers(pinstance); + pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq); + return -ENOMEM; + } + + if (pmcraid_allocate_control_blocks(pinstance)) { + pmcraid_err("couldn't allocate memory control blocks \n"); + pmcraid_release_config_buffers(pinstance); + pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD); + pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq); + return -ENOMEM; + } + + /* Initialize all the command blocks and add them to free pool. No + * need to lock (free_pool_lock) as this is done in initialization + * itself + */ + for (i = 0; i < PMCRAID_MAX_CMD; i++) { + struct pmcraid_cmd *cmdp = pinstance->cmd_list[i]; + pmcraid_init_cmdblk(cmdp, i); + cmdp->drv_inst = pinstance; + list_add_tail(&cmdp->free_list, &pinstance->free_cmd_pool); + } + + return 0; +} + +/** + * pmcraid_reinit_buffers - resets various buffer pointers + * @pinstance: pointer to adapter instance + * Return value + * none + */ +static void pmcraid_reinit_buffers(struct pmcraid_instance *pinstance) +{ + int i; + int buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD; + + for (i = 0; i < pinstance->num_hrrq; i++) { + memset(pinstance->hrrq_start[i], 0, buffer_size); + pinstance->hrrq_curr[i] = pinstance->hrrq_start[i]; + pinstance->hrrq_end[i] = + pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1; + pinstance->host_toggle_bit[i] = 1; + } +} + +/** + * pmcraid_init_instance - initialize per instance data structure + * @pdev: pointer to pci device structure + * @host: pointer to Scsi_Host structure + * @mapped_pci_addr: memory mapped IOA configuration registers + * + * Return Value + * 0 on success, non-zero in case of any failure + */ +static int __devinit pmcraid_init_instance( + struct pci_dev *pdev, + struct Scsi_Host *host, + void __iomem *mapped_pci_addr +) +{ + struct pmcraid_instance *pinstance = + (struct pmcraid_instance *)host->hostdata; + + pinstance->host = host; + pinstance->pdev = pdev; + + /* Initialize register addresses */ + pinstance->mapped_dma_addr = mapped_pci_addr; + + /* Initialize chip-specific details */ + { + struct pmcraid_chip_details *chip_cfg = pinstance->chip_cfg; + struct pmcraid_interrupts *pint_regs = &pinstance->int_regs; + + pinstance->ioarrin = mapped_pci_addr + chip_cfg->ioarrin; + + pint_regs->ioa_host_interrupt_reg = + mapped_pci_addr + chip_cfg->ioa_host_intr; + pint_regs->ioa_host_interrupt_clr_reg = + mapped_pci_addr + chip_cfg->ioa_host_intr_clr; + pint_regs->host_ioa_interrupt_reg = + mapped_pci_addr + chip_cfg->host_ioa_intr; + pint_regs->host_ioa_interrupt_clr_reg = + mapped_pci_addr + chip_cfg->host_ioa_intr_clr; + + /* Current version of firmware exposes interrupt mask set + * and mask clr registers through memory mapped bar0. + */ + pinstance->mailbox = mapped_pci_addr + chip_cfg->mailbox; + pinstance->ioa_status = mapped_pci_addr + chip_cfg->ioastatus; + pint_regs->ioa_host_interrupt_mask_reg = + mapped_pci_addr + chip_cfg->ioa_host_mask; + pint_regs->ioa_host_interrupt_mask_clr_reg = + mapped_pci_addr + chip_cfg->ioa_host_mask_clr; + pint_regs->global_interrupt_mask_reg = + mapped_pci_addr + chip_cfg->global_intr_mask; + }; + + pinstance->ioa_reset_attempts = 0; + init_waitqueue_head(&pinstance->reset_wait_q); + + atomic_set(&pinstance->outstanding_cmds, 0); + atomic_set(&pinstance->expose_resources, 0); + + INIT_LIST_HEAD(&pinstance->free_res_q); + INIT_LIST_HEAD(&pinstance->used_res_q); + INIT_LIST_HEAD(&pinstance->free_cmd_pool); + INIT_LIST_HEAD(&pinstance->pending_cmd_pool); + + spin_lock_init(&pinstance->free_pool_lock); + spin_lock_init(&pinstance->pending_pool_lock); + spin_lock_init(&pinstance->resource_lock); + mutex_init(&pinstance->aen_queue_lock); + + /* Work-queue (Shared) for deferred processing error handling */ + INIT_WORK(&pinstance->worker_q, pmcraid_worker_function); + + /* Initialize the default log_level */ + pinstance->current_log_level = pmcraid_log_level; + + /* Setup variables required for reset engine */ + pinstance->ioa_state = IOA_STATE_UNKNOWN; + pinstance->reset_cmd = NULL; + return 0; +} + +/** + * pmcraid_release_buffers - release per-adapter buffers allocated + * + * @pinstance: pointer to adapter soft state + * + * Return Value + * none + */ +static void pmcraid_release_buffers(struct pmcraid_instance *pinstance) +{ + pmcraid_release_config_buffers(pinstance); + pmcraid_release_control_blocks(pinstance, PMCRAID_MAX_CMD); + pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD); + pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq); + +} + +/** + * pmcraid_shutdown - shutdown adapter controller. + * @pdev: pci device struct + * + * Issues an adapter shutdown to the card waits for its completion + * + * Return value + * none + */ +static void pmcraid_shutdown(struct pci_dev *pdev) +{ + struct pmcraid_instance *pinstance = pci_get_drvdata(pdev); + pmcraid_reset_bringdown(pinstance); +} + + +/** + * pmcraid_get_minor - returns unused minor number from minor number bitmap + */ +static unsigned short pmcraid_get_minor(void) +{ + int minor; + + minor = find_first_zero_bit(pmcraid_minor, sizeof(pmcraid_minor)); + __set_bit(minor, pmcraid_minor); + return minor; +} + +/** + * pmcraid_release_minor - releases given minor back to minor number bitmap + */ +static void pmcraid_release_minor(unsigned short minor) +{ + __clear_bit(minor, pmcraid_minor); +} + +/** + * pmcraid_setup_chrdev - allocates a minor number and registers a char device + * + * @pinstance: pointer to adapter instance for which to register device + * + * Return value + * 0 in case of success, otherwise non-zero + */ +static int pmcraid_setup_chrdev(struct pmcraid_instance *pinstance) +{ + int minor; + int error; + + minor = pmcraid_get_minor(); + cdev_init(&pinstance->cdev, &pmcraid_fops); + pinstance->cdev.owner = THIS_MODULE; + + error = cdev_add(&pinstance->cdev, MKDEV(pmcraid_major, minor), 1); + + if (error) + pmcraid_release_minor(minor); + else + device_create(pmcraid_class, NULL, MKDEV(pmcraid_major, minor), + NULL, "pmcsas%u", minor); + return error; +} + +/** + * pmcraid_release_chrdev - unregisters per-adapter management interface + * + * @pinstance: pointer to adapter instance structure + * + * Return value + * none + */ +static void pmcraid_release_chrdev(struct pmcraid_instance *pinstance) +{ + pmcraid_release_minor(MINOR(pinstance->cdev.dev)); + device_destroy(pmcraid_class, + MKDEV(pmcraid_major, MINOR(pinstance->cdev.dev))); + cdev_del(&pinstance->cdev); +} + +/** + * pmcraid_remove - IOA hot plug remove entry point + * @pdev: pci device struct + * + * Return value + * none + */ +static void __devexit pmcraid_remove(struct pci_dev *pdev) +{ + struct pmcraid_instance *pinstance = pci_get_drvdata(pdev); + + /* remove the management interface (/dev file) for this device */ + pmcraid_release_chrdev(pinstance); + + /* remove host template from scsi midlayer */ + scsi_remove_host(pinstance->host); + + /* block requests from mid-layer */ + scsi_block_requests(pinstance->host); + + /* initiate shutdown adapter */ + pmcraid_shutdown(pdev); + + pmcraid_disable_interrupts(pinstance, ~0); + flush_scheduled_work(); + + pmcraid_kill_tasklets(pinstance); + pmcraid_unregister_interrupt_handler(pinstance); + pmcraid_release_buffers(pinstance); + iounmap(pinstance->mapped_dma_addr); + pci_release_regions(pdev); + scsi_host_put(pinstance->host); + pci_disable_device(pdev); + + return; +} + +#ifdef CONFIG_PM +/** + * pmcraid_suspend - driver suspend entry point for power management + * @pdev: PCI device structure + * @state: PCI power state to suspend routine + * + * Return Value - 0 always + */ +static int pmcraid_suspend(struct pci_dev *pdev, pm_message_t state) +{ + struct pmcraid_instance *pinstance = pci_get_drvdata(pdev); + + pmcraid_shutdown(pdev); + pmcraid_disable_interrupts(pinstance, ~0); + pmcraid_kill_tasklets(pinstance); + pci_set_drvdata(pinstance->pdev, pinstance); + pmcraid_unregister_interrupt_handler(pinstance); + pci_save_state(pdev); + pci_disable_device(pdev); + pci_set_power_state(pdev, pci_choose_state(pdev, state)); + + return 0; +} + +/** + * pmcraid_resume - driver resume entry point PCI power management + * @pdev: PCI device structure + * + * Return Value - 0 in case of success. Error code in case of any failure + */ +static int pmcraid_resume(struct pci_dev *pdev) +{ + struct pmcraid_instance *pinstance = pci_get_drvdata(pdev); + struct Scsi_Host *host = pinstance->host; + int rc; + int hrrqs; + + pci_set_power_state(pdev, PCI_D0); + pci_enable_wake(pdev, PCI_D0, 0); + pci_restore_state(pdev); + + rc = pci_enable_device(pdev); + + if (rc) { + pmcraid_err("pmcraid: Enable device failed\n"); + return rc; + } + + pci_set_master(pdev); + + if ((sizeof(dma_addr_t) == 4) || + pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) + rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); + + if (rc == 0) + rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); + + if (rc != 0) { + dev_err(&pdev->dev, "Failed to set PCI DMA mask\n"); + goto disable_device; + } + + atomic_set(&pinstance->outstanding_cmds, 0); + hrrqs = pinstance->num_hrrq; + rc = pmcraid_register_interrupt_handler(pinstance); + + if (rc) { + pmcraid_err("resume: couldn't register interrupt handlers\n"); + rc = -ENODEV; + goto release_host; + } + + pmcraid_init_tasklets(pinstance); + pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS); + + /* Start with hard reset sequence which brings up IOA to operational + * state as well as completes the reset sequence. + */ + pinstance->ioa_hard_reset = 1; + + /* Start IOA firmware initialization and bring card to Operational + * state. + */ + if (pmcraid_reset_bringup(pinstance)) { + pmcraid_err("couldn't initialize IOA \n"); + rc = -ENODEV; + goto release_tasklets; + } + + return 0; + +release_tasklets: + pmcraid_kill_tasklets(pinstance); + pmcraid_unregister_interrupt_handler(pinstance); + +release_host: + scsi_host_put(host); + +disable_device: + pci_disable_device(pdev); + + return rc; +} + +#else + +#define pmcraid_suspend NULL +#define pmcraid_resume NULL + +#endif /* CONFIG_PM */ + +/** + * pmcraid_complete_ioa_reset - Called by either timer or tasklet during + * completion of the ioa reset + * @cmd: pointer to reset command block + */ +static void pmcraid_complete_ioa_reset(struct pmcraid_cmd *cmd) +{ + struct pmcraid_instance *pinstance = cmd->drv_inst; + unsigned long flags; + + spin_lock_irqsave(pinstance->host->host_lock, flags); + pmcraid_ioa_reset(cmd); + spin_unlock_irqrestore(pinstance->host->host_lock, flags); + scsi_unblock_requests(pinstance->host); + schedule_work(&pinstance->worker_q); +} + +/** + * pmcraid_set_supported_devs - sends SET SUPPORTED DEVICES to IOAFP + * + * @cmd: pointer to pmcraid_cmd structure + * + * Return Value + * 0 for success or non-zero for failure cases + */ +static void pmcraid_set_supported_devs(struct pmcraid_cmd *cmd) +{ + struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb; + void (*cmd_done) (struct pmcraid_cmd *) = pmcraid_complete_ioa_reset; + + pmcraid_reinit_cmdblk(cmd); + + ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE); + ioarcb->request_type = REQ_TYPE_IOACMD; + ioarcb->cdb[0] = PMCRAID_SET_SUPPORTED_DEVICES; + ioarcb->cdb[1] = ALL_DEVICES_SUPPORTED; + + /* If this was called as part of resource table reinitialization due to + * lost CCN, it is enough to return the command block back to free pool + * as part of set_supported_devs completion function. + */ + if (cmd->drv_inst->reinit_cfg_table) { + cmd->drv_inst->reinit_cfg_table = 0; + cmd->release = 1; + cmd_done = pmcraid_reinit_cfgtable_done; + } + + /* we will be done with the reset sequence after set supported devices, + * setup the done function to return the command block back to free + * pool + */ + pmcraid_send_cmd(cmd, + cmd_done, + PMCRAID_SET_SUP_DEV_TIMEOUT, + pmcraid_timeout_handler); + return; +} + +/** + * pmcraid_init_res_table - Initialize the resource table + * @cmd: pointer to pmcraid command struct + * + * This function looks through the existing resource table, comparing + * it with the config table. This function will take care of old/new + * devices and schedule adding/removing them from the mid-layer + * as appropriate. + * + * Return value + * None + */ +static void pmcraid_init_res_table(struct pmcraid_cmd *cmd) +{ + struct pmcraid_instance *pinstance = cmd->drv_inst; + struct pmcraid_resource_entry *res, *temp; + struct pmcraid_config_table_entry *cfgte; + unsigned long lock_flags; + int found, rc, i; + LIST_HEAD(old_res); + + if (pinstance->cfg_table->flags & MICROCODE_UPDATE_REQUIRED) + dev_err(&pinstance->pdev->dev, "Require microcode download\n"); + + /* resource list is protected by pinstance->resource_lock. + * init_res_table can be called from probe (user-thread) or runtime + * reset (timer/tasklet) + */ + spin_lock_irqsave(&pinstance->resource_lock, lock_flags); + + list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue) + list_move_tail(&res->queue, &old_res); + + for (i = 0; i < pinstance->cfg_table->num_entries; i++) { + cfgte = &pinstance->cfg_table->entries[i]; + + if (!pmcraid_expose_resource(cfgte)) + continue; + + found = 0; + + /* If this entry was already detected and initialized */ + list_for_each_entry_safe(res, temp, &old_res, queue) { + + rc = memcmp(&res->cfg_entry.resource_address, + &cfgte->resource_address, + sizeof(cfgte->resource_address)); + if (!rc) { + list_move_tail(&res->queue, + &pinstance->used_res_q); + found = 1; + break; + } + } + + /* If this is new entry, initialize it and add it the queue */ + if (!found) { + + if (list_empty(&pinstance->free_res_q)) { + dev_err(&pinstance->pdev->dev, + "Too many devices attached\n"); + break; + } + + found = 1; + res = list_entry(pinstance->free_res_q.next, + struct pmcraid_resource_entry, queue); + + res->scsi_dev = NULL; + res->change_detected = RES_CHANGE_ADD; + res->reset_progress = 0; + list_move_tail(&res->queue, &pinstance->used_res_q); + } + + /* copy new configuration table entry details into driver + * maintained resource entry + */ + if (found) { + memcpy(&res->cfg_entry, cfgte, + sizeof(struct pmcraid_config_table_entry)); + pmcraid_info("New res type:%x, vset:%x, addr:%x:\n", + res->cfg_entry.resource_type, + res->cfg_entry.unique_flags1, + le32_to_cpu(res->cfg_entry.resource_address)); + } + } + + /* Detect any deleted entries, mark them for deletion from mid-layer */ + list_for_each_entry_safe(res, temp, &old_res, queue) { + + if (res->scsi_dev) { + res->change_detected = RES_CHANGE_DEL; + res->cfg_entry.resource_handle = + PMCRAID_INVALID_RES_HANDLE; + list_move_tail(&res->queue, &pinstance->used_res_q); + } else { + list_move_tail(&res->queue, &pinstance->free_res_q); + } + } + + /* release the resource list lock */ + spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags); + pmcraid_set_supported_devs(cmd); +} + +/** + * pmcraid_querycfg - Send a Query IOA Config to the adapter. + * @cmd: pointer pmcraid_cmd struct + * + * This function sends a Query IOA Configuration command to the adapter to + * retrieve the IOA configuration table. + * + * Return value: + * none + */ +static void pmcraid_querycfg(struct pmcraid_cmd *cmd) +{ + struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb; + struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl; + struct pmcraid_instance *pinstance = cmd->drv_inst; + int cfg_table_size = cpu_to_be32(sizeof(struct pmcraid_config_table)); + + ioarcb->request_type = REQ_TYPE_IOACMD; + ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE); + + ioarcb->cdb[0] = PMCRAID_QUERY_IOA_CONFIG; + + /* firmware requires 4-byte length field, specified in B.E format */ + memcpy(&(ioarcb->cdb[10]), &cfg_table_size, sizeof(cfg_table_size)); + + /* Since entire config table can be described by single IOADL, it can + * be part of IOARCB itself + */ + ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) + + offsetof(struct pmcraid_ioarcb, + add_data.u.ioadl[0])); + ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc)); + ioarcb->ioarcb_bus_addr &= ~(0x1FULL); + + ioarcb->request_flags0 |= NO_LINK_DESCS; + ioarcb->data_transfer_length = + cpu_to_le32(sizeof(struct pmcraid_config_table)); + + ioadl = &(ioarcb->add_data.u.ioadl[0]); + ioadl->flags = cpu_to_le32(IOADL_FLAGS_LAST_DESC); + ioadl->address = cpu_to_le64(pinstance->cfg_table_bus_addr); + ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_config_table)); + + pmcraid_send_cmd(cmd, pmcraid_init_res_table, + PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler); +} + + +/** + * pmcraid_probe - PCI probe entry pointer for PMC MaxRaid controller driver + * @pdev: pointer to pci device structure + * @dev_id: pointer to device ids structure + * + * Return Value + * returns 0 if the device is claimed and successfully configured. + * returns non-zero error code in case of any failure + */ +static int __devinit pmcraid_probe( + struct pci_dev *pdev, + const struct pci_device_id *dev_id +) +{ + struct pmcraid_instance *pinstance; + struct Scsi_Host *host; + void __iomem *mapped_pci_addr; + int rc = PCIBIOS_SUCCESSFUL; + + if (atomic_read(&pmcraid_adapter_count) >= PMCRAID_MAX_ADAPTERS) { + pmcraid_err + ("maximum number(%d) of supported adapters reached\n", + atomic_read(&pmcraid_adapter_count)); + return -ENOMEM; + } + + atomic_inc(&pmcraid_adapter_count); + rc = pci_enable_device(pdev); + + if (rc) { + dev_err(&pdev->dev, "Cannot enable adapter\n"); + atomic_dec(&pmcraid_adapter_count); + return rc; + } + + dev_info(&pdev->dev, + "Found new IOA(%x:%x), Total IOA count: %d\n", + pdev->vendor, pdev->device, + atomic_read(&pmcraid_adapter_count)); + + rc = pci_request_regions(pdev, PMCRAID_DRIVER_NAME); + + if (rc < 0) { + dev_err(&pdev->dev, + "Couldn't register memory range of registers\n"); + goto out_disable_device; + } + + mapped_pci_addr = pci_iomap(pdev, 0, 0); + + if (!mapped_pci_addr) { + dev_err(&pdev->dev, "Couldn't map PCI registers memory\n"); + rc = -ENOMEM; + goto out_release_regions; + } + + pci_set_master(pdev); + + /* Firmware requires the system bus address of IOARCB to be within + * 32-bit addressable range though it has 64-bit IOARRIN register. + * However, firmware supports 64-bit streaming DMA buffers, whereas + * coherent buffers are to be 32-bit. Since pci_alloc_consistent always + * returns memory within 4GB (if not, change this logic), coherent + * buffers are within firmware acceptible address ranges. + */ + if ((sizeof(dma_addr_t) == 4) || + pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) + rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); + + /* firmware expects 32-bit DMA addresses for IOARRIN register; set 32 + * bit mask for pci_alloc_consistent to return addresses within 4GB + */ + if (rc == 0) + rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); + + if (rc != 0) { + dev_err(&pdev->dev, "Failed to set PCI DMA mask\n"); + goto cleanup_nomem; + } + + host = scsi_host_alloc(&pmcraid_host_template, + sizeof(struct pmcraid_instance)); + + if (!host) { + dev_err(&pdev->dev, "scsi_host_alloc failed!\n"); + rc = -ENOMEM; + goto cleanup_nomem; + } + + host->max_id = PMCRAID_MAX_NUM_TARGETS_PER_BUS; + host->max_lun = PMCRAID_MAX_NUM_LUNS_PER_TARGET; + host->unique_id = host->host_no; + host->max_channel = PMCRAID_MAX_BUS_TO_SCAN; + host->max_cmd_len = PMCRAID_MAX_CDB_LEN; + + /* zero out entire instance structure */ + pinstance = (struct pmcraid_instance *)host->hostdata; + memset(pinstance, 0, sizeof(*pinstance)); + + pinstance->chip_cfg = + (struct pmcraid_chip_details *)(dev_id->driver_data); + + rc = pmcraid_init_instance(pdev, host, mapped_pci_addr); + + if (rc < 0) { + dev_err(&pdev->dev, "failed to initialize adapter instance\n"); + goto out_scsi_host_put; + } + + pci_set_drvdata(pdev, pinstance); + + /* Save PCI config-space for use following the reset */ + rc = pci_save_state(pinstance->pdev); + + if (rc != 0) { + dev_err(&pdev->dev, "Failed to save PCI config space\n"); + goto out_scsi_host_put; + } + + pmcraid_disable_interrupts(pinstance, ~0); + + rc = pmcraid_register_interrupt_handler(pinstance); + + if (rc) { + pmcraid_err("couldn't register interrupt handler\n"); + goto out_scsi_host_put; + } + + pmcraid_init_tasklets(pinstance); + + /* allocate verious buffers used by LLD.*/ + rc = pmcraid_init_buffers(pinstance); + + if (rc) { + pmcraid_err("couldn't allocate memory blocks\n"); + goto out_unregister_isr; + } + + /* check the reset type required */ + pmcraid_reset_type(pinstance); + + pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS); + + /* Start IOA firmware initialization and bring card to Operational + * state. + */ + pmcraid_info("starting IOA initialization sequence\n"); + if (pmcraid_reset_bringup(pinstance)) { + pmcraid_err("couldn't initialize IOA \n"); + rc = 1; + goto out_release_bufs; + } + + /* Add adapter instance into mid-layer list */ + rc = scsi_add_host(pinstance->host, &pdev->dev); + if (rc != 0) { + pmcraid_err("couldn't add host into mid-layer: %d\n", rc); + goto out_release_bufs; + } + + scsi_scan_host(pinstance->host); + + rc = pmcraid_setup_chrdev(pinstance); + + if (rc != 0) { + pmcraid_err("couldn't create mgmt interface, error: %x\n", + rc); + goto out_remove_host; + } + + /* Schedule worker thread to handle CCN and take care of adding and + * removing devices to OS + */ + atomic_set(&pinstance->expose_resources, 1); + schedule_work(&pinstance->worker_q); + return rc; + +out_remove_host: + scsi_remove_host(host); + +out_release_bufs: + pmcraid_release_buffers(pinstance); + +out_unregister_isr: + pmcraid_kill_tasklets(pinstance); + pmcraid_unregister_interrupt_handler(pinstance); + +out_scsi_host_put: + scsi_host_put(host); + +cleanup_nomem: + iounmap(mapped_pci_addr); + +out_release_regions: + pci_release_regions(pdev); + +out_disable_device: + atomic_dec(&pmcraid_adapter_count); + pci_set_drvdata(pdev, NULL); + pci_disable_device(pdev); + return -ENODEV; +} + +/* + * PCI driver structure of pcmraid driver + */ +static struct pci_driver pmcraid_driver = { + .name = PMCRAID_DRIVER_NAME, + .id_table = pmcraid_pci_table, + .probe = pmcraid_probe, + .remove = pmcraid_remove, + .suspend = pmcraid_suspend, + .resume = pmcraid_resume, + .shutdown = pmcraid_shutdown +}; + + +/** + * pmcraid_init - module load entry point + */ +static int __init pmcraid_init(void) +{ + dev_t dev; + int error; + + pmcraid_info("%s Device Driver version: %s %s\n", + PMCRAID_DRIVER_NAME, + PMCRAID_DRIVER_VERSION, PMCRAID_DRIVER_DATE); + + error = alloc_chrdev_region(&dev, 0, + PMCRAID_MAX_ADAPTERS, + PMCRAID_DEVFILE); + + if (error) { + pmcraid_err("failed to get a major number for adapters\n"); + goto out_init; + } + + pmcraid_major = MAJOR(dev); + pmcraid_class = class_create(THIS_MODULE, PMCRAID_DEVFILE); + + if (IS_ERR(pmcraid_class)) { + error = PTR_ERR(pmcraid_class); + pmcraid_err("failed to register with with sysfs, error = %x\n", + error); + goto out_unreg_chrdev; + } + + + error = pmcraid_netlink_init(); + + if (error) + goto out_unreg_chrdev; + + error = pci_register_driver(&pmcraid_driver); + + if (error == 0) + goto out_init; + + pmcraid_err("failed to register pmcraid driver, error = %x\n", + error); + class_destroy(pmcraid_class); + pmcraid_netlink_release(); + +out_unreg_chrdev: + unregister_chrdev_region(MKDEV(pmcraid_major, 0), PMCRAID_MAX_ADAPTERS); +out_init: + return error; +} + +/** + * pmcraid_exit - module unload entry point + */ +static void __exit pmcraid_exit(void) +{ + pmcraid_netlink_release(); + class_destroy(pmcraid_class); + unregister_chrdev_region(MKDEV(pmcraid_major, 0), + PMCRAID_MAX_ADAPTERS); + pci_unregister_driver(&pmcraid_driver); +} + +module_init(pmcraid_init); +module_exit(pmcraid_exit); |