diff options
Diffstat (limited to 'drivers/pci/dmar.c')
| -rw-r--r-- | drivers/pci/dmar.c | 811 |
1 files changed, 0 insertions, 811 deletions
diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c deleted file mode 100644 index 26c536b51c5..00000000000 --- a/drivers/pci/dmar.c +++ /dev/null @@ -1,811 +0,0 @@ -/* - * Copyright (c) 2006, Intel Corporation. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * - * This program is distributed in the hope 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. - * - * Copyright (C) 2006-2008 Intel Corporation - * Author: Ashok Raj <ashok.raj@intel.com> - * Author: Shaohua Li <shaohua.li@intel.com> - * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> - * - * This file implements early detection/parsing of Remapping Devices - * reported to OS through BIOS via DMA remapping reporting (DMAR) ACPI - * tables. - * - * These routines are used by both DMA-remapping and Interrupt-remapping - */ - -#include <linux/pci.h> -#include <linux/dmar.h> -#include <linux/iova.h> -#include <linux/intel-iommu.h> -#include <linux/timer.h> - -#undef PREFIX -#define PREFIX "DMAR:" - -/* No locks are needed as DMA remapping hardware unit - * list is constructed at boot time and hotplug of - * these units are not supported by the architecture. - */ -LIST_HEAD(dmar_drhd_units); - -static struct acpi_table_header * __initdata dmar_tbl; - -static void __init dmar_register_drhd_unit(struct dmar_drhd_unit *drhd) -{ - /* - * add INCLUDE_ALL at the tail, so scan the list will find it at - * the very end. - */ - if (drhd->include_all) - list_add_tail(&drhd->list, &dmar_drhd_units); - else - list_add(&drhd->list, &dmar_drhd_units); -} - -static int __init dmar_parse_one_dev_scope(struct acpi_dmar_device_scope *scope, - struct pci_dev **dev, u16 segment) -{ - struct pci_bus *bus; - struct pci_dev *pdev = NULL; - struct acpi_dmar_pci_path *path; - int count; - - bus = pci_find_bus(segment, scope->bus); - path = (struct acpi_dmar_pci_path *)(scope + 1); - count = (scope->length - sizeof(struct acpi_dmar_device_scope)) - / sizeof(struct acpi_dmar_pci_path); - - while (count) { - if (pdev) - pci_dev_put(pdev); - /* - * Some BIOSes list non-exist devices in DMAR table, just - * ignore it - */ - if (!bus) { - printk(KERN_WARNING - PREFIX "Device scope bus [%d] not found\n", - scope->bus); - break; - } - pdev = pci_get_slot(bus, PCI_DEVFN(path->dev, path->fn)); - if (!pdev) { - printk(KERN_WARNING PREFIX - "Device scope device [%04x:%02x:%02x.%02x] not found\n", - segment, bus->number, path->dev, path->fn); - break; - } - path ++; - count --; - bus = pdev->subordinate; - } - if (!pdev) { - printk(KERN_WARNING PREFIX - "Device scope device [%04x:%02x:%02x.%02x] not found\n", - segment, scope->bus, path->dev, path->fn); - *dev = NULL; - return 0; - } - if ((scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT && \ - pdev->subordinate) || (scope->entry_type == \ - ACPI_DMAR_SCOPE_TYPE_BRIDGE && !pdev->subordinate)) { - pci_dev_put(pdev); - printk(KERN_WARNING PREFIX - "Device scope type does not match for %s\n", - pci_name(pdev)); - return -EINVAL; - } - *dev = pdev; - return 0; -} - -static int __init dmar_parse_dev_scope(void *start, void *end, int *cnt, - struct pci_dev ***devices, u16 segment) -{ - struct acpi_dmar_device_scope *scope; - void * tmp = start; - int index; - int ret; - - *cnt = 0; - while (start < end) { - scope = start; - if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT || - scope->entry_type == ACPI_DMAR_SCOPE_TYPE_BRIDGE) - (*cnt)++; - else - printk(KERN_WARNING PREFIX - "Unsupported device scope\n"); - start += scope->length; - } - if (*cnt == 0) - return 0; - - *devices = kcalloc(*cnt, sizeof(struct pci_dev *), GFP_KERNEL); - if (!*devices) - return -ENOMEM; - - start = tmp; - index = 0; - while (start < end) { - scope = start; - if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT || - scope->entry_type == ACPI_DMAR_SCOPE_TYPE_BRIDGE) { - ret = dmar_parse_one_dev_scope(scope, - &(*devices)[index], segment); - if (ret) { - kfree(*devices); - return ret; - } - index ++; - } - start += scope->length; - } - - return 0; -} - -/** - * dmar_parse_one_drhd - parses exactly one DMA remapping hardware definition - * structure which uniquely represent one DMA remapping hardware unit - * present in the platform - */ -static int __init -dmar_parse_one_drhd(struct acpi_dmar_header *header) -{ - struct acpi_dmar_hardware_unit *drhd; - struct dmar_drhd_unit *dmaru; - int ret = 0; - - dmaru = kzalloc(sizeof(*dmaru), GFP_KERNEL); - if (!dmaru) - return -ENOMEM; - - dmaru->hdr = header; - drhd = (struct acpi_dmar_hardware_unit *)header; - dmaru->reg_base_addr = drhd->address; - dmaru->include_all = drhd->flags & 0x1; /* BIT0: INCLUDE_ALL */ - - ret = alloc_iommu(dmaru); - if (ret) { - kfree(dmaru); - return ret; - } - dmar_register_drhd_unit(dmaru); - return 0; -} - -static int __init dmar_parse_dev(struct dmar_drhd_unit *dmaru) -{ - struct acpi_dmar_hardware_unit *drhd; - int ret = 0; - - drhd = (struct acpi_dmar_hardware_unit *) dmaru->hdr; - - if (dmaru->include_all) - return 0; - - ret = dmar_parse_dev_scope((void *)(drhd + 1), - ((void *)drhd) + drhd->header.length, - &dmaru->devices_cnt, &dmaru->devices, - drhd->segment); - if (ret) { - list_del(&dmaru->list); - kfree(dmaru); - } - return ret; -} - -#ifdef CONFIG_DMAR -LIST_HEAD(dmar_rmrr_units); - -static void __init dmar_register_rmrr_unit(struct dmar_rmrr_unit *rmrr) -{ - list_add(&rmrr->list, &dmar_rmrr_units); -} - - -static int __init -dmar_parse_one_rmrr(struct acpi_dmar_header *header) -{ - struct acpi_dmar_reserved_memory *rmrr; - struct dmar_rmrr_unit *rmrru; - - rmrru = kzalloc(sizeof(*rmrru), GFP_KERNEL); - if (!rmrru) - return -ENOMEM; - - rmrru->hdr = header; - rmrr = (struct acpi_dmar_reserved_memory *)header; - rmrru->base_address = rmrr->base_address; - rmrru->end_address = rmrr->end_address; - - dmar_register_rmrr_unit(rmrru); - return 0; -} - -static int __init -rmrr_parse_dev(struct dmar_rmrr_unit *rmrru) -{ - struct acpi_dmar_reserved_memory *rmrr; - int ret; - - rmrr = (struct acpi_dmar_reserved_memory *) rmrru->hdr; - ret = dmar_parse_dev_scope((void *)(rmrr + 1), - ((void *)rmrr) + rmrr->header.length, - &rmrru->devices_cnt, &rmrru->devices, rmrr->segment); - - if (ret || (rmrru->devices_cnt == 0)) { - list_del(&rmrru->list); - kfree(rmrru); - } - return ret; -} -#endif - -static void __init -dmar_table_print_dmar_entry(struct acpi_dmar_header *header) -{ - struct acpi_dmar_hardware_unit *drhd; - struct acpi_dmar_reserved_memory *rmrr; - - switch (header->type) { - case ACPI_DMAR_TYPE_HARDWARE_UNIT: - drhd = (struct acpi_dmar_hardware_unit *)header; - printk (KERN_INFO PREFIX - "DRHD (flags: 0x%08x)base: 0x%016Lx\n", - drhd->flags, (unsigned long long)drhd->address); - break; - case ACPI_DMAR_TYPE_RESERVED_MEMORY: - rmrr = (struct acpi_dmar_reserved_memory *)header; - - printk (KERN_INFO PREFIX - "RMRR base: 0x%016Lx end: 0x%016Lx\n", - (unsigned long long)rmrr->base_address, - (unsigned long long)rmrr->end_address); - break; - } -} - -/** - * dmar_table_detect - checks to see if the platform supports DMAR devices - */ -static int __init dmar_table_detect(void) -{ - acpi_status status = AE_OK; - - /* if we could find DMAR table, then there are DMAR devices */ - status = acpi_get_table(ACPI_SIG_DMAR, 0, - (struct acpi_table_header **)&dmar_tbl); - - if (ACPI_SUCCESS(status) && !dmar_tbl) { - printk (KERN_WARNING PREFIX "Unable to map DMAR\n"); - status = AE_NOT_FOUND; - } - - return (ACPI_SUCCESS(status) ? 1 : 0); -} - -/** - * parse_dmar_table - parses the DMA reporting table - */ -static int __init -parse_dmar_table(void) -{ - struct acpi_table_dmar *dmar; - struct acpi_dmar_header *entry_header; - int ret = 0; - - /* - * Do it again, earlier dmar_tbl mapping could be mapped with - * fixed map. - */ - dmar_table_detect(); - - dmar = (struct acpi_table_dmar *)dmar_tbl; - if (!dmar) - return -ENODEV; - - if (dmar->width < PAGE_SHIFT - 1) { - printk(KERN_WARNING PREFIX "Invalid DMAR haw\n"); - return -EINVAL; - } - - printk (KERN_INFO PREFIX "Host address width %d\n", - dmar->width + 1); - - entry_header = (struct acpi_dmar_header *)(dmar + 1); - while (((unsigned long)entry_header) < - (((unsigned long)dmar) + dmar_tbl->length)) { - /* Avoid looping forever on bad ACPI tables */ - if (entry_header->length == 0) { - printk(KERN_WARNING PREFIX - "Invalid 0-length structure\n"); - ret = -EINVAL; - break; - } - - dmar_table_print_dmar_entry(entry_header); - - switch (entry_header->type) { - case ACPI_DMAR_TYPE_HARDWARE_UNIT: - ret = dmar_parse_one_drhd(entry_header); - break; - case ACPI_DMAR_TYPE_RESERVED_MEMORY: -#ifdef CONFIG_DMAR - ret = dmar_parse_one_rmrr(entry_header); -#endif - break; - default: - printk(KERN_WARNING PREFIX - "Unknown DMAR structure type\n"); - ret = 0; /* for forward compatibility */ - break; - } - if (ret) - break; - - entry_header = ((void *)entry_header + entry_header->length); - } - return ret; -} - -int dmar_pci_device_match(struct pci_dev *devices[], int cnt, - struct pci_dev *dev) -{ - int index; - - while (dev) { - for (index = 0; index < cnt; index++) - if (dev == devices[index]) - return 1; - - /* Check our parent */ - dev = dev->bus->self; - } - - return 0; -} - -struct dmar_drhd_unit * -dmar_find_matched_drhd_unit(struct pci_dev *dev) -{ - struct dmar_drhd_unit *dmaru = NULL; - struct acpi_dmar_hardware_unit *drhd; - - list_for_each_entry(dmaru, &dmar_drhd_units, list) { - drhd = container_of(dmaru->hdr, - struct acpi_dmar_hardware_unit, - header); - - if (dmaru->include_all && - drhd->segment == pci_domain_nr(dev->bus)) - return dmaru; - - if (dmar_pci_device_match(dmaru->devices, - dmaru->devices_cnt, dev)) - return dmaru; - } - - return NULL; -} - -int __init dmar_dev_scope_init(void) -{ - struct dmar_drhd_unit *drhd, *drhd_n; - int ret = -ENODEV; - - list_for_each_entry_safe(drhd, drhd_n, &dmar_drhd_units, list) { - ret = dmar_parse_dev(drhd); - if (ret) - return ret; - } - -#ifdef CONFIG_DMAR - { - struct dmar_rmrr_unit *rmrr, *rmrr_n; - list_for_each_entry_safe(rmrr, rmrr_n, &dmar_rmrr_units, list) { - ret = rmrr_parse_dev(rmrr); - if (ret) - return ret; - } - } -#endif - - return ret; -} - - -int __init dmar_table_init(void) -{ - static int dmar_table_initialized; - int ret; - - if (dmar_table_initialized) - return 0; - - dmar_table_initialized = 1; - - ret = parse_dmar_table(); - if (ret) { - if (ret != -ENODEV) - printk(KERN_INFO PREFIX "parse DMAR table failure.\n"); - return ret; - } - - if (list_empty(&dmar_drhd_units)) { - printk(KERN_INFO PREFIX "No DMAR devices found\n"); - return -ENODEV; - } - -#ifdef CONFIG_DMAR - if (list_empty(&dmar_rmrr_units)) - printk(KERN_INFO PREFIX "No RMRR found\n"); -#endif - -#ifdef CONFIG_INTR_REMAP - parse_ioapics_under_ir(); -#endif - return 0; -} - -void __init detect_intel_iommu(void) -{ - int ret; - - ret = dmar_table_detect(); - - { -#ifdef CONFIG_INTR_REMAP - struct acpi_table_dmar *dmar; - /* - * for now we will disable dma-remapping when interrupt - * remapping is enabled. - * When support for queued invalidation for IOTLB invalidation - * is added, we will not need this any more. - */ - dmar = (struct acpi_table_dmar *) dmar_tbl; - if (ret && cpu_has_x2apic && dmar->flags & 0x1) - printk(KERN_INFO - "Queued invalidation will be enabled to support " - "x2apic and Intr-remapping.\n"); -#endif -#ifdef CONFIG_DMAR - if (ret && !no_iommu && !iommu_detected && !swiotlb && - !dmar_disabled) - iommu_detected = 1; -#endif - } - dmar_tbl = NULL; -} - - -int alloc_iommu(struct dmar_drhd_unit *drhd) -{ - struct intel_iommu *iommu; - int map_size; - u32 ver; - static int iommu_allocated = 0; - int agaw = 0; - - iommu = kzalloc(sizeof(*iommu), GFP_KERNEL); - if (!iommu) - return -ENOMEM; - - iommu->seq_id = iommu_allocated++; - - iommu->reg = ioremap(drhd->reg_base_addr, VTD_PAGE_SIZE); - if (!iommu->reg) { - printk(KERN_ERR "IOMMU: can't map the region\n"); - goto error; - } - iommu->cap = dmar_readq(iommu->reg + DMAR_CAP_REG); - iommu->ecap = dmar_readq(iommu->reg + DMAR_ECAP_REG); - -#ifdef CONFIG_DMAR - agaw = iommu_calculate_agaw(iommu); - if (agaw < 0) { - printk(KERN_ERR - "Cannot get a valid agaw for iommu (seq_id = %d)\n", - iommu->seq_id); - goto error; - } -#endif - iommu->agaw = agaw; - - /* the registers might be more than one page */ - map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap), - cap_max_fault_reg_offset(iommu->cap)); - map_size = VTD_PAGE_ALIGN(map_size); - if (map_size > VTD_PAGE_SIZE) { - iounmap(iommu->reg); - iommu->reg = ioremap(drhd->reg_base_addr, map_size); - if (!iommu->reg) { - printk(KERN_ERR "IOMMU: can't map the region\n"); - goto error; - } - } - - ver = readl(iommu->reg + DMAR_VER_REG); - pr_debug("IOMMU %llx: ver %d:%d cap %llx ecap %llx\n", - (unsigned long long)drhd->reg_base_addr, - DMAR_VER_MAJOR(ver), DMAR_VER_MINOR(ver), - (unsigned long long)iommu->cap, - (unsigned long long)iommu->ecap); - - spin_lock_init(&iommu->register_lock); - - drhd->iommu = iommu; - return 0; -error: - kfree(iommu); - return -1; -} - -void free_iommu(struct intel_iommu *iommu) -{ - if (!iommu) - return; - -#ifdef CONFIG_DMAR - free_dmar_iommu(iommu); -#endif - - if (iommu->reg) - iounmap(iommu->reg); - kfree(iommu); -} - -/* - * Reclaim all the submitted descriptors which have completed its work. - */ -static inline void reclaim_free_desc(struct q_inval *qi) -{ - while (qi->desc_status[qi->free_tail] == QI_DONE) { - qi->desc_status[qi->free_tail] = QI_FREE; - qi->free_tail = (qi->free_tail + 1) % QI_LENGTH; - qi->free_cnt++; - } -} - -static int qi_check_fault(struct intel_iommu *iommu, int index) -{ - u32 fault; - int head; - struct q_inval *qi = iommu->qi; - int wait_index = (index + 1) % QI_LENGTH; - - fault = readl(iommu->reg + DMAR_FSTS_REG); - - /* - * If IQE happens, the head points to the descriptor associated - * with the error. No new descriptors are fetched until the IQE - * is cleared. - */ - if (fault & DMA_FSTS_IQE) { - head = readl(iommu->reg + DMAR_IQH_REG); - if ((head >> 4) == index) { - memcpy(&qi->desc[index], &qi->desc[wait_index], - sizeof(struct qi_desc)); - __iommu_flush_cache(iommu, &qi->desc[index], - sizeof(struct qi_desc)); - writel(DMA_FSTS_IQE, iommu->reg + DMAR_FSTS_REG); - return -EINVAL; - } - } - - return 0; -} - -/* - * Submit the queued invalidation descriptor to the remapping - * hardware unit and wait for its completion. - */ -int qi_submit_sync(struct qi_desc *desc, struct intel_iommu *iommu) -{ - int rc = 0; - struct q_inval *qi = iommu->qi; - struct qi_desc *hw, wait_desc; - int wait_index, index; - unsigned long flags; - - if (!qi) - return 0; - - hw = qi->desc; - - spin_lock_irqsave(&qi->q_lock, flags); - while (qi->free_cnt < 3) { - spin_unlock_irqrestore(&qi->q_lock, flags); - cpu_relax(); - spin_lock_irqsave(&qi->q_lock, flags); - } - - index = qi->free_head; - wait_index = (index + 1) % QI_LENGTH; - - qi->desc_status[index] = qi->desc_status[wait_index] = QI_IN_USE; - - hw[index] = *desc; - - wait_desc.low = QI_IWD_STATUS_DATA(QI_DONE) | - QI_IWD_STATUS_WRITE | QI_IWD_TYPE; - wait_desc.high = virt_to_phys(&qi->desc_status[wait_index]); - - hw[wait_index] = wait_desc; - - __iommu_flush_cache(iommu, &hw[index], sizeof(struct qi_desc)); - __iommu_flush_cache(iommu, &hw[wait_index], sizeof(struct qi_desc)); - - qi->free_head = (qi->free_head + 2) % QI_LENGTH; - qi->free_cnt -= 2; - - /* - * update the HW tail register indicating the presence of - * new descriptors. - */ - writel(qi->free_head << 4, iommu->reg + DMAR_IQT_REG); - - while (qi->desc_status[wait_index] != QI_DONE) { - /* - * We will leave the interrupts disabled, to prevent interrupt - * context to queue another cmd while a cmd is already submitted - * and waiting for completion on this cpu. This is to avoid - * a deadlock where the interrupt context can wait indefinitely - * for free slots in the queue. - */ - rc = qi_check_fault(iommu, index); - if (rc) - goto out; - - spin_unlock(&qi->q_lock); - cpu_relax(); - spin_lock(&qi->q_lock); - } -out: - qi->desc_status[index] = qi->desc_status[wait_index] = QI_DONE; - - reclaim_free_desc(qi); - spin_unlock_irqrestore(&qi->q_lock, flags); - - return rc; -} - -/* - * Flush the global interrupt entry cache. - */ -void qi_global_iec(struct intel_iommu *iommu) -{ - struct qi_desc desc; - - desc.low = QI_IEC_TYPE; - desc.high = 0; - - /* should never fail */ - qi_submit_sync(&desc, iommu); -} - -int qi_flush_context(struct intel_iommu *iommu, u16 did, u16 sid, u8 fm, - u64 type, int non_present_entry_flush) -{ - struct qi_desc desc; - - if (non_present_entry_flush) { - if (!cap_caching_mode(iommu->cap)) - return 1; - else - did = 0; - } - - desc.low = QI_CC_FM(fm) | QI_CC_SID(sid) | QI_CC_DID(did) - | QI_CC_GRAN(type) | QI_CC_TYPE; - desc.high = 0; - - return qi_submit_sync(&desc, iommu); -} - -int qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr, - unsigned int size_order, u64 type, - int non_present_entry_flush) -{ - u8 dw = 0, dr = 0; - - struct qi_desc desc; - int ih = 0; - - if (non_present_entry_flush) { - if (!cap_caching_mode(iommu->cap)) - return 1; - else - did = 0; - } - - if (cap_write_drain(iommu->cap)) - dw = 1; - - if (cap_read_drain(iommu->cap)) - dr = 1; - - desc.low = QI_IOTLB_DID(did) | QI_IOTLB_DR(dr) | QI_IOTLB_DW(dw) - | QI_IOTLB_GRAN(type) | QI_IOTLB_TYPE; - desc.high = QI_IOTLB_ADDR(addr) | QI_IOTLB_IH(ih) - | QI_IOTLB_AM(size_order); - - return qi_submit_sync(&desc, iommu); -} - -/* - * Enable Queued Invalidation interface. This is a must to support - * interrupt-remapping. Also used by DMA-remapping, which replaces - * register based IOTLB invalidation. - */ -int dmar_enable_qi(struct intel_iommu *iommu) -{ - u32 cmd, sts; - unsigned long flags; - struct q_inval *qi; - - if (!ecap_qis(iommu->ecap)) - return -ENOENT; - - /* - * queued invalidation is already setup and enabled. - */ - if (iommu->qi) - return 0; - - iommu->qi = kmalloc(sizeof(*qi), GFP_KERNEL); - if (!iommu->qi) - return -ENOMEM; - - qi = iommu->qi; - - qi->desc = (void *)(get_zeroed_page(GFP_KERNEL)); - if (!qi->desc) { - kfree(qi); - iommu->qi = 0; - return -ENOMEM; - } - - qi->desc_status = kmalloc(QI_LENGTH * sizeof(int), GFP_KERNEL); - if (!qi->desc_status) { - free_page((unsigned long) qi->desc); - kfree(qi); - iommu->qi = 0; - return -ENOMEM; - } - - qi->free_head = qi->free_tail = 0; - qi->free_cnt = QI_LENGTH; - - spin_lock_init(&qi->q_lock); - - spin_lock_irqsave(&iommu->register_lock, flags); - /* write zero to the tail reg */ - writel(0, iommu->reg + DMAR_IQT_REG); - - dmar_writeq(iommu->reg + DMAR_IQA_REG, virt_to_phys(qi->desc)); - - cmd = iommu->gcmd | DMA_GCMD_QIE; - iommu->gcmd |= DMA_GCMD_QIE; - writel(cmd, iommu->reg + DMAR_GCMD_REG); - - /* Make sure hardware complete it */ - IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, (sts & DMA_GSTS_QIES), sts); - spin_unlock_irqrestore(&iommu->register_lock, flags); - - return 0; -} |