diff options
Diffstat (limited to 'drivers/scsi/megaraid/megaraid_sas.c')
| -rw-r--r-- | drivers/scsi/megaraid/megaraid_sas.c | 152 |
1 files changed, 146 insertions, 6 deletions
diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c index 08c3d4315eb..499f994f503 100644 --- a/drivers/scsi/megaraid/megaraid_sas.c +++ b/drivers/scsi/megaraid/megaraid_sas.c @@ -47,6 +47,14 @@ #include <scsi/scsi_host.h> #include "megaraid_sas.h" +/* + * poll_mode_io:1- schedule complete completion from q cmd + */ +static unsigned int poll_mode_io; +module_param_named(poll_mode_io, poll_mode_io, int, 0); +MODULE_PARM_DESC(poll_mode_io, + "Complete cmds from IO path, (default=0)"); + MODULE_LICENSE("GPL"); MODULE_VERSION(MEGASAS_VERSION); MODULE_AUTHOR("megaraidlinux@lsi.com"); @@ -860,6 +868,12 @@ megasas_queue_command(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd *)) atomic_inc(&instance->fw_outstanding); instance->instancet->fire_cmd(cmd->frame_phys_addr ,cmd->frame_count-1,instance->reg_set); + /* + * Check if we have pend cmds to be completed + */ + if (poll_mode_io && atomic_read(&instance->fw_outstanding)) + tasklet_schedule(&instance->isr_tasklet); + return 0; @@ -1892,6 +1906,47 @@ fail_fw_init: } /** + * megasas_start_timer - Initializes a timer object + * @instance: Adapter soft state + * @timer: timer object to be initialized + * @fn: timer function + * @interval: time interval between timer function call + */ +static inline void +megasas_start_timer(struct megasas_instance *instance, + struct timer_list *timer, + void *fn, unsigned long interval) +{ + init_timer(timer); + timer->expires = jiffies + interval; + timer->data = (unsigned long)instance; + timer->function = fn; + add_timer(timer); +} + +/** + * megasas_io_completion_timer - Timer fn + * @instance_addr: Address of adapter soft state + * + * Schedules tasklet for cmd completion + * if poll_mode_io is set + */ +static void +megasas_io_completion_timer(unsigned long instance_addr) +{ + struct megasas_instance *instance = + (struct megasas_instance *)instance_addr; + + if (atomic_read(&instance->fw_outstanding)) + tasklet_schedule(&instance->isr_tasklet); + + /* Restart timer */ + if (poll_mode_io) + mod_timer(&instance->io_completion_timer, + jiffies + MEGASAS_COMPLETION_TIMER_INTERVAL); +} + +/** * megasas_init_mfi - Initializes the FW * @instance: Adapter soft state * @@ -2017,8 +2072,14 @@ static int megasas_init_mfi(struct megasas_instance *instance) * Setup tasklet for cmd completion */ - tasklet_init(&instance->isr_tasklet, megasas_complete_cmd_dpc, - (unsigned long)instance); + tasklet_init(&instance->isr_tasklet, megasas_complete_cmd_dpc, + (unsigned long)instance); + + /* Initialize the cmd completion timer */ + if (poll_mode_io) + megasas_start_timer(instance, &instance->io_completion_timer, + megasas_io_completion_timer, + MEGASAS_COMPLETION_TIMER_INTERVAL); return 0; fail_fw_init: @@ -2578,8 +2639,8 @@ static void megasas_shutdown_controller(struct megasas_instance *instance, } /** - * megasas_suspend - driver suspend entry point - * @pdev: PCI device structure + * megasas_suspend - driver suspend entry point + * @pdev: PCI device structure * @state: PCI power state to suspend routine */ static int __devinit @@ -2591,6 +2652,9 @@ megasas_suspend(struct pci_dev *pdev, pm_message_t state) instance = pci_get_drvdata(pdev); host = instance->host; + if (poll_mode_io) + del_timer_sync(&instance->io_completion_timer); + megasas_flush_cache(instance); megasas_shutdown_controller(instance, MR_DCMD_HIBERNATE_SHUTDOWN); tasklet_kill(&instance->isr_tasklet); @@ -2677,6 +2741,11 @@ megasas_resume(struct pci_dev *pdev) if (megasas_start_aen(instance)) printk(KERN_ERR "megasas: Start AEN failed\n"); + /* Initialize the cmd completion timer */ + if (poll_mode_io) + megasas_start_timer(instance, &instance->io_completion_timer, + megasas_io_completion_timer, + MEGASAS_COMPLETION_TIMER_INTERVAL); return 0; fail_irq: @@ -2715,6 +2784,9 @@ static void megasas_detach_one(struct pci_dev *pdev) instance = pci_get_drvdata(pdev); host = instance->host; + if (poll_mode_io) + del_timer_sync(&instance->io_completion_timer); + scsi_remove_host(instance->host); megasas_flush_cache(instance); megasas_shutdown_controller(instance, MR_DCMD_CTRL_SHUTDOWN); @@ -3188,7 +3260,7 @@ static DRIVER_ATTR(release_date, S_IRUGO, megasas_sysfs_show_release_date, static ssize_t megasas_sysfs_show_dbg_lvl(struct device_driver *dd, char *buf) { - return sprintf(buf,"%u",megasas_dbg_lvl); + return sprintf(buf, "%u\n", megasas_dbg_lvl); } static ssize_t @@ -3203,7 +3275,65 @@ megasas_sysfs_set_dbg_lvl(struct device_driver *dd, const char *buf, size_t coun } static DRIVER_ATTR(dbg_lvl, S_IRUGO|S_IWUGO, megasas_sysfs_show_dbg_lvl, - megasas_sysfs_set_dbg_lvl); + megasas_sysfs_set_dbg_lvl); + +static ssize_t +megasas_sysfs_show_poll_mode_io(struct device_driver *dd, char *buf) +{ + return sprintf(buf, "%u\n", poll_mode_io); +} + +static ssize_t +megasas_sysfs_set_poll_mode_io(struct device_driver *dd, + const char *buf, size_t count) +{ + int retval = count; + int tmp = poll_mode_io; + int i; + struct megasas_instance *instance; + + if (sscanf(buf, "%u", &poll_mode_io) < 1) { + printk(KERN_ERR "megasas: could not set poll_mode_io\n"); + retval = -EINVAL; + } + + /* + * Check if poll_mode_io is already set or is same as previous value + */ + if ((tmp && poll_mode_io) || (tmp == poll_mode_io)) + goto out; + + if (poll_mode_io) { + /* + * Start timers for all adapters + */ + for (i = 0; i < megasas_mgmt_info.max_index; i++) { + instance = megasas_mgmt_info.instance[i]; + if (instance) { + megasas_start_timer(instance, + &instance->io_completion_timer, + megasas_io_completion_timer, + MEGASAS_COMPLETION_TIMER_INTERVAL); + } + } + } else { + /* + * Delete timers for all adapters + */ + for (i = 0; i < megasas_mgmt_info.max_index; i++) { + instance = megasas_mgmt_info.instance[i]; + if (instance) + del_timer_sync(&instance->io_completion_timer); + } + } + +out: + return retval; +} + +static DRIVER_ATTR(poll_mode_io, S_IRUGO|S_IWUGO, + megasas_sysfs_show_poll_mode_io, + megasas_sysfs_set_poll_mode_io); /** * megasas_init - Driver load entry point @@ -3254,8 +3384,16 @@ static int __init megasas_init(void) &driver_attr_dbg_lvl); if (rval) goto err_dcf_dbg_lvl; + rval = driver_create_file(&megasas_pci_driver.driver, + &driver_attr_poll_mode_io); + if (rval) + goto err_dcf_poll_mode_io; return rval; + +err_dcf_poll_mode_io: + driver_remove_file(&megasas_pci_driver.driver, + &driver_attr_dbg_lvl); err_dcf_dbg_lvl: driver_remove_file(&megasas_pci_driver.driver, &driver_attr_release_date); @@ -3274,6 +3412,8 @@ err_pcidrv: static void __exit megasas_exit(void) { driver_remove_file(&megasas_pci_driver.driver, + &driver_attr_poll_mode_io); + driver_remove_file(&megasas_pci_driver.driver, &driver_attr_dbg_lvl); driver_remove_file(&megasas_pci_driver.driver, &driver_attr_release_date); |