diff options
Diffstat (limited to 'drivers/iommu/dmar.c')
| -rw-r--r-- | drivers/iommu/dmar.c | 1311 |
1 files changed, 1311 insertions, 0 deletions
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c new file mode 100644 index 000000000000..35c1e17fce1d --- /dev/null +++ b/drivers/iommu/dmar.c @@ -0,0 +1,1311 @@ +/* + * 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> +#include <linux/irq.h> +#include <linux/interrupt.h> +#include <linux/tboot.h> +#include <linux/dmi.h> +#include <linux/slab.h> +#include <asm/iommu_table.h> + +#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); + +struct acpi_table_header * __initdata dmar_tbl; +static acpi_size dmar_tbl_size; + +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; +} + +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 if (scope->entry_type != ACPI_DMAR_SCOPE_TYPE_IOAPIC) { + 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; + + drhd = (struct acpi_dmar_hardware_unit *)header; + dmaru = kzalloc(sizeof(*dmaru), GFP_KERNEL); + if (!dmaru) + return -ENOMEM; + + dmaru->hdr = header; + dmaru->reg_base_addr = drhd->address; + dmaru->segment = drhd->segment; + 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_ACPI_NUMA +static int __init +dmar_parse_one_rhsa(struct acpi_dmar_header *header) +{ + struct acpi_dmar_rhsa *rhsa; + struct dmar_drhd_unit *drhd; + + rhsa = (struct acpi_dmar_rhsa *)header; + for_each_drhd_unit(drhd) { + if (drhd->reg_base_addr == rhsa->base_address) { + int node = acpi_map_pxm_to_node(rhsa->proximity_domain); + + if (!node_online(node)) + node = -1; + drhd->iommu->node = node; + return 0; + } + } + WARN_TAINT( + 1, TAINT_FIRMWARE_WORKAROUND, + "Your BIOS is broken; RHSA refers to non-existent DMAR unit at %llx\n" + "BIOS vendor: %s; Ver: %s; Product Version: %s\n", + drhd->reg_base_addr, + dmi_get_system_info(DMI_BIOS_VENDOR), + dmi_get_system_info(DMI_BIOS_VERSION), + dmi_get_system_info(DMI_PRODUCT_VERSION)); + + return 0; +} +#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; + struct acpi_dmar_atsr *atsr; + struct acpi_dmar_rhsa *rhsa; + + switch (header->type) { + case ACPI_DMAR_TYPE_HARDWARE_UNIT: + drhd = container_of(header, struct acpi_dmar_hardware_unit, + header); + printk (KERN_INFO PREFIX + "DRHD base: %#016Lx flags: %#x\n", + (unsigned long long)drhd->address, drhd->flags); + break; + case ACPI_DMAR_TYPE_RESERVED_MEMORY: + rmrr = container_of(header, struct acpi_dmar_reserved_memory, + header); + printk (KERN_INFO PREFIX + "RMRR base: %#016Lx end: %#016Lx\n", + (unsigned long long)rmrr->base_address, + (unsigned long long)rmrr->end_address); + break; + case ACPI_DMAR_TYPE_ATSR: + atsr = container_of(header, struct acpi_dmar_atsr, header); + printk(KERN_INFO PREFIX "ATSR flags: %#x\n", atsr->flags); + break; + case ACPI_DMAR_HARDWARE_AFFINITY: + rhsa = container_of(header, struct acpi_dmar_rhsa, header); + printk(KERN_INFO PREFIX "RHSA base: %#016Lx proximity domain: %#x\n", + (unsigned long long)rhsa->base_address, + rhsa->proximity_domain); + 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_with_size(ACPI_SIG_DMAR, 0, + (struct acpi_table_header **)&dmar_tbl, + &dmar_tbl_size); + + 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(); + + /* + * ACPI tables may not be DMA protected by tboot, so use DMAR copy + * SINIT saved in SinitMleData in TXT heap (which is DMA protected) + */ + dmar_tbl = tboot_get_dmar_table(dmar_tbl); + + 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: + ret = dmar_parse_one_rmrr(entry_header); + break; + case ACPI_DMAR_TYPE_ATSR: + ret = dmar_parse_one_atsr(entry_header); + break; + case ACPI_DMAR_HARDWARE_AFFINITY: +#ifdef CONFIG_ACPI_NUMA + ret = dmar_parse_one_rhsa(entry_header); +#endif + break; + default: + printk(KERN_WARNING PREFIX + "Unknown DMAR structure type %d\n", + entry_header->type); + ret = 0; /* for forward compatibility */ + break; + } + if (ret) + break; + + entry_header = ((void *)entry_header + entry_header->length); + } + return ret; +} + +static 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; + + dev = pci_physfn(dev); + + 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) +{ + static int dmar_dev_scope_initialized; + struct dmar_drhd_unit *drhd, *drhd_n; + int ret = -ENODEV; + + if (dmar_dev_scope_initialized) + return dmar_dev_scope_initialized; + + if (list_empty(&dmar_drhd_units)) + goto fail; + + list_for_each_entry_safe(drhd, drhd_n, &dmar_drhd_units, list) { + ret = dmar_parse_dev(drhd); + if (ret) + goto fail; + } + + ret = dmar_parse_rmrr_atsr_dev(); + if (ret) + goto fail; + + dmar_dev_scope_initialized = 1; + return 0; + +fail: + dmar_dev_scope_initialized = ret; + 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; + } + + return 0; +} + +static void warn_invalid_dmar(u64 addr, const char *message) +{ + WARN_TAINT_ONCE( + 1, TAINT_FIRMWARE_WORKAROUND, + "Your BIOS is broken; DMAR reported at address %llx%s!\n" + "BIOS vendor: %s; Ver: %s; Product Version: %s\n", + addr, message, + dmi_get_system_info(DMI_BIOS_VENDOR), + dmi_get_system_info(DMI_BIOS_VERSION), + dmi_get_system_info(DMI_PRODUCT_VERSION)); +} + +int __init check_zero_address(void) +{ + struct acpi_table_dmar *dmar; + struct acpi_dmar_header *entry_header; + struct acpi_dmar_hardware_unit *drhd; + + dmar = (struct acpi_table_dmar *)dmar_tbl; + 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"); + return 0; + } + + if (entry_header->type == ACPI_DMAR_TYPE_HARDWARE_UNIT) { + void __iomem *addr; + u64 cap, ecap; + + drhd = (void *)entry_header; + if (!drhd->address) { + warn_invalid_dmar(0, ""); + goto failed; + } + + addr = early_ioremap(drhd->address, VTD_PAGE_SIZE); + if (!addr ) { + printk("IOMMU: can't validate: %llx\n", drhd->address); + goto failed; + } + cap = dmar_readq(addr + DMAR_CAP_REG); + ecap = dmar_readq(addr + DMAR_ECAP_REG); + early_iounmap(addr, VTD_PAGE_SIZE); + if (cap == (uint64_t)-1 && ecap == (uint64_t)-1) { + warn_invalid_dmar(drhd->address, + " returns all ones"); + goto failed; + } + } + + entry_header = ((void *)entry_header + entry_header->length); + } + return 1; + +failed: + return 0; +} + +int __init detect_intel_iommu(void) +{ + int ret; + + ret = dmar_table_detect(); + if (ret) + ret = check_zero_address(); + { + struct acpi_table_dmar *dmar; + + dmar = (struct acpi_table_dmar *) dmar_tbl; + + if (ret && intr_remapping_enabled && cpu_has_x2apic && + dmar->flags & 0x1) + printk(KERN_INFO + "Queued invalidation will be enabled to support x2apic and Intr-remapping.\n"); + + if (ret && !no_iommu && !iommu_detected && !dmar_disabled) { + iommu_detected = 1; + /* Make sure ACS will be enabled */ + pci_request_acs(); + } + +#ifdef CONFIG_X86 + if (ret) + x86_init.iommu.iommu_init = intel_iommu_init; +#endif + } + early_acpi_os_unmap_memory(dmar_tbl, dmar_tbl_size); + dmar_tbl = NULL; + + return ret ? 1 : -ENODEV; +} + + +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; + int msagaw = 0; + + if (!drhd->reg_base_addr) { + warn_invalid_dmar(0, ""); + return -EINVAL; + } + + iommu = kzalloc(sizeof(*iommu), GFP_KERNEL); + if (!iommu) + return -ENOMEM; + + iommu->seq_id = iommu_allocated++; + sprintf (iommu->name, "dmar%d", iommu->seq_id); + + 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); + + if (iommu->cap == (uint64_t)-1 && iommu->ecap == (uint64_t)-1) { + warn_invalid_dmar(drhd->reg_base_addr, " returns all ones"); + goto err_unmap; + } + + 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 err_unmap; + } + msagaw = iommu_calculate_max_sagaw(iommu); + if (msagaw < 0) { + printk(KERN_ERR + "Cannot get a valid max agaw for iommu (seq_id = %d)\n", + iommu->seq_id); + goto err_unmap; + } + iommu->agaw = agaw; + iommu->msagaw = msagaw; + + iommu->node = -1; + + /* 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_info("IOMMU %d: reg_base_addr %llx ver %d:%d cap %llx ecap %llx\n", + iommu->seq_id, + (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); + + raw_spin_lock_init(&iommu->register_lock); + + drhd->iommu = iommu; + return 0; + + err_unmap: + iounmap(iommu->reg); + error: + kfree(iommu); + return -1; +} + +void free_iommu(struct intel_iommu *iommu) +{ + if (!iommu) + return; + + free_dmar_iommu(iommu); + + 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_ABORT) { + 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, tail; + struct q_inval *qi = iommu->qi; + int wait_index = (index + 1) % QI_LENGTH; + + if (qi->desc_status[wait_index] == QI_ABORT) + return -EAGAIN; + + 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 >> DMAR_IQ_SHIFT) == index) { + printk(KERN_ERR "VT-d detected invalid descriptor: " + "low=%llx, high=%llx\n", + (unsigned long long)qi->desc[index].low, + (unsigned long long)qi->desc[index].high); + 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; + } + } + + /* + * If ITE happens, all pending wait_desc commands are aborted. + * No new descriptors are fetched until the ITE is cleared. + */ + if (fault & DMA_FSTS_ITE) { + head = readl(iommu->reg + DMAR_IQH_REG); + head = ((head >> DMAR_IQ_SHIFT) - 1 + QI_LENGTH) % QI_LENGTH; + head |= 1; + tail = readl(iommu->reg + DMAR_IQT_REG); + tail = ((tail >> DMAR_IQ_SHIFT) - 1 + QI_LENGTH) % QI_LENGTH; + + writel(DMA_FSTS_ITE, iommu->reg + DMAR_FSTS_REG); + + do { + if (qi->desc_status[head] == QI_IN_USE) + qi->desc_status[head] = QI_ABORT; + head = (head - 2 + QI_LENGTH) % QI_LENGTH; + } while (head != tail); + + if (qi->desc_status[wait_index] == QI_ABORT) + return -EAGAIN; + } + + if (fault & DMA_FSTS_ICE) + writel(DMA_FSTS_ICE, iommu->reg + DMAR_FSTS_REG); + + 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; + 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; + +restart: + rc = 0; + + raw_spin_lock_irqsave(&qi->q_lock, flags); + while (qi->free_cnt < 3) { + raw_spin_unlock_irqrestore(&qi->q_lock, flags); + cpu_relax(); + raw_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 << DMAR_IQ_SHIFT, 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) + break; + + raw_spin_unlock(&qi->q_lock); + cpu_relax(); + raw_spin_lock(&qi->q_lock); + } + + qi->desc_status[index] = QI_DONE; + + reclaim_free_desc(qi); + raw_spin_unlock_irqrestore(&qi->q_lock, flags); + + if (rc == -EAGAIN) + goto restart; + + 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); +} + +void qi_flush_context(struct intel_iommu *iommu, u16 did, u16 sid, u8 fm, + u64 type) +{ + struct qi_desc desc; + + desc.low = QI_CC_FM(fm) | QI_CC_SID(sid) | QI_CC_DID(did) + | QI_CC_GRAN(type) | QI_CC_TYPE; + desc.high = 0; + + qi_submit_sync(&desc, iommu); +} + +void qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr, + unsigned int size_order, u64 type) +{ + u8 dw = 0, dr = 0; + + struct qi_desc desc; + int ih = 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); + + qi_submit_sync(&desc, iommu); +} + +void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 qdep, + u64 addr, unsigned mask) +{ + struct qi_desc desc; + + if (mask) { + BUG_ON(addr & ((1 << (VTD_PAGE_SHIFT + mask)) - 1)); + addr |= (1 << (VTD_PAGE_SHIFT + mask - 1)) - 1; + desc.high = QI_DEV_IOTLB_ADDR(addr) | QI_DEV_IOTLB_SIZE; + } else + desc.high = QI_DEV_IOTLB_ADDR(addr); + + if (qdep >= QI_DEV_IOTLB_MAX_INVS) + qdep = 0; + + desc.low = QI_DEV_IOTLB_SID(sid) | QI_DEV_IOTLB_QDEP(qdep) | + QI_DIOTLB_TYPE; + + qi_submit_sync(&desc, iommu); +} + +/* + * Disable Queued Invalidation interface. + */ +void dmar_disable_qi(struct intel_iommu *iommu) +{ + unsigned long flags; + u32 sts; + cycles_t start_time = get_cycles(); + + if (!ecap_qis(iommu->ecap)) + return; + + raw_spin_lock_irqsave(&iommu->register_lock, flags); + + sts = dmar_readq(iommu->reg + DMAR_GSTS_REG); + if (!(sts & DMA_GSTS_QIES)) + goto end; + + /* + * Give a chance to HW to complete the pending invalidation requests. + */ + while ((readl(iommu->reg + DMAR_IQT_REG) != + readl(iommu->reg + DMAR_IQH_REG)) && + (DMAR_OPERATION_TIMEOUT > (get_cycles() - start_time))) + cpu_relax(); + + iommu->gcmd &= ~DMA_GCMD_QIE; + writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); + + IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, + !(sts & DMA_GSTS_QIES), sts); +end: + raw_spin_unlock_irqrestore(&iommu->register_lock, flags); +} + +/* + * Enable queued invalidation. + */ +static void __dmar_enable_qi(struct intel_iommu *iommu) +{ + u32 sts; + unsigned long flags; + struct q_inval *qi = iommu->qi; + + qi->free_head = qi->free_tail = 0; + qi->free_cnt = QI_LENGTH; + + raw_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)); + + iommu->gcmd |= DMA_GCMD_QIE; + writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); + + /* Make sure hardware complete it */ + IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, (sts & DMA_GSTS_QIES), sts); + + raw_spin_unlock_irqrestore(&iommu->register_lock, flags); +} + +/* + * 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) +{ + struct q_inval *qi; + struct page *desc_page; + + 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_ATOMIC); + if (!iommu->qi) + return -ENOMEM; + + qi = iommu->qi; + + + desc_page = alloc_pages_node(iommu->node, GFP_ATOMIC | __GFP_ZERO, 0); + if (!desc_page) { + kfree(qi); + iommu->qi = 0; + return -ENOMEM; + } + + qi->desc = page_address(desc_page); + + qi->desc_status = kmalloc(QI_LENGTH * sizeof(int), GFP_ATOMIC); + 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; + + raw_spin_lock_init(&qi->q_lock); + + __dmar_enable_qi(iommu); + + return 0; +} + +/* iommu interrupt handling. Most stuff are MSI-like. */ + +enum faulttype { + DMA_REMAP, + INTR_REMAP, + UNKNOWN, +}; + +static const char *dma_remap_fault_reasons[] = +{ + "Software", + "Present bit in root entry is clear", + "Present bit in context entry is clear", + "Invalid context entry", + "Access beyond MGAW", + "PTE Write access is not set", + "PTE Read access is not set", + "Next page table ptr is invalid", + "Root table address invalid", + "Context table ptr is invalid", + "non-zero reserved fields in RTP", + "non-zero reserved fields in CTP", + "non-zero reserved fields in PTE", +}; + +static const char *intr_remap_fault_reasons[] = +{ + "Detected reserved fields in the decoded interrupt-remapped request", + "Interrupt index exceeded the interrupt-remapping table size", + "Present field in the IRTE entry is clear", + "Error accessing interrupt-remapping table pointed by IRTA_REG", + "Detected reserved fields in the IRTE entry", + "Blocked a compatibility format interrupt request", + "Blocked an interrupt request due to source-id verification failure", +}; + +#define MAX_FAULT_REASON_IDX (ARRAY_SIZE(fault_reason_strings) - 1) + +const char *dmar_get_fault_reason(u8 fault_reason, int *fault_type) +{ + if (fault_reason >= 0x20 && (fault_reason <= 0x20 + + ARRAY_SIZE(intr_remap_fault_reasons))) { + *fault_type = INTR_REMAP; + return intr_remap_fault_reasons[fault_reason - 0x20]; + } else if (fault_reason < ARRAY_SIZE(dma_remap_fault_reasons)) { + *fault_type = DMA_REMAP; + return dma_remap_fault_reasons[fault_reason]; + } else { + *fault_type = UNKNOWN; + return "Unknown"; + } +} + +void dmar_msi_unmask(struct irq_data *data) +{ + struct intel_iommu *iommu = irq_data_get_irq_handler_data(data); + unsigned long flag; + + /* unmask it */ + raw_spin_lock_irqsave(&iommu->register_lock, flag); + writel(0, iommu->reg + DMAR_FECTL_REG); + /* Read a reg to force flush the post write */ + readl(iommu->reg + DMAR_FECTL_REG); + raw_spin_unlock_irqrestore(&iommu->register_lock, flag); +} + +void dmar_msi_mask(struct irq_data *data) +{ + unsigned long flag; + struct intel_iommu *iommu = irq_data_get_irq_handler_data(data); + + /* mask it */ + raw_spin_lock_irqsave(&iommu->register_lock, flag); + writel(DMA_FECTL_IM, iommu->reg + DMAR_FECTL_REG); + /* Read a reg to force flush the post write */ + readl(iommu->reg + DMAR_FECTL_REG); + raw_spin_unlock_irqrestore(&iommu->register_lock, flag); +} + +void dmar_msi_write(int irq, struct msi_msg *msg) +{ + struct intel_iommu *iommu = irq_get_handler_data(irq); + unsigned long flag; + + raw_spin_lock_irqsave(&iommu->register_lock, flag); + writel(msg->data, iommu->reg + DMAR_FEDATA_REG); + writel(msg->address_lo, iommu->reg + DMAR_FEADDR_REG); + writel(msg->address_hi, iommu->reg + DMAR_FEUADDR_REG); + raw_spin_unlock_irqrestore(&iommu->register_lock, flag); +} + +void dmar_msi_read(int irq, struct msi_msg *msg) +{ + struct intel_iommu *iommu = irq_get_handler_data(irq); + unsigned long flag; + + raw_spin_lock_irqsave(&iommu->register_lock, flag); + msg->data = readl(iommu->reg + DMAR_FEDATA_REG); + msg->address_lo = readl(iommu->reg + DMAR_FEADDR_REG); + msg->address_hi = readl(iommu->reg + DMAR_FEUADDR_REG); + raw_spin_unlock_irqrestore(&iommu->register_lock, flag); +} + +static int dmar_fault_do_one(struct intel_iommu *iommu, int type, + u8 fault_reason, u16 source_id, unsigned long long addr) +{ + const char *reason; + int fault_type; + + reason = dmar_get_fault_reason(fault_reason, &fault_type); + + if (fault_type == INTR_REMAP) + printk(KERN_ERR "INTR-REMAP: Request device [[%02x:%02x.%d] " + "fault index %llx\n" + "INTR-REMAP:[fault reason %02d] %s\n", + (source_id >> 8), PCI_SLOT(source_id & 0xFF), + PCI_FUNC(source_id & 0xFF), addr >> 48, + fault_reason, reason); + else + printk(KERN_ERR + "DMAR:[%s] Request device [%02x:%02x.%d] " + "fault addr %llx \n" + "DMAR:[fault reason %02d] %s\n", + (type ? "DMA Read" : "DMA Write"), + (source_id >> 8), PCI_SLOT(source_id & 0xFF), + PCI_FUNC(source_id & 0xFF), addr, fault_reason, reason); + return 0; +} + +#define PRIMARY_FAULT_REG_LEN (16) +irqreturn_t dmar_fault(int irq, void *dev_id) +{ + struct intel_iommu *iommu = dev_id; + int reg, fault_index; + u32 fault_status; + unsigned long flag; + + raw_spin_lock_irqsave(&iommu->register_lock, flag); + fault_status = readl(iommu->reg + DMAR_FSTS_REG); + if (fault_status) + printk(KERN_ERR "DRHD: handling fault status reg %x\n", + fault_status); + + /* TBD: ignore advanced fault log currently */ + if (!(fault_status & DMA_FSTS_PPF)) + goto clear_rest; + + fault_index = dma_fsts_fault_record_index(fault_status); + reg = cap_fault_reg_offset(iommu->cap); + while (1) { + u8 fault_reason; + u16 source_id; + u64 guest_addr; + int type; + u32 data; + + /* highest 32 bits */ + data = readl(iommu->reg + reg + + fault_index * PRIMARY_FAULT_REG_LEN + 12); + if (!(data & DMA_FRCD_F)) + break; + + fault_reason = dma_frcd_fault_reason(data); + type = dma_frcd_type(data); + + data = readl(iommu->reg + reg + + fault_index * PRIMARY_FAULT_REG_LEN + 8); + source_id = dma_frcd_source_id(data); + + guest_addr = dmar_readq(iommu->reg + reg + + fault_index * PRIMARY_FAULT_REG_LEN); + guest_addr = dma_frcd_page_addr(guest_addr); + /* clear the fault */ + writel(DMA_FRCD_F, iommu->reg + reg + + fault_index * PRIMARY_FAULT_REG_LEN + 12); + + raw_spin_unlock_irqrestore(&iommu->register_lock, flag); + + dmar_fault_do_one(iommu, type, fault_reason, + source_id, guest_addr); + + fault_index++; + if (fault_index >= cap_num_fault_regs(iommu->cap)) + fault_index = 0; + raw_spin_lock_irqsave(&iommu->register_lock, flag); + } +clear_rest: + /* clear all the other faults */ + fault_status = readl(iommu->reg + DMAR_FSTS_REG); + writel(fault_status, iommu->reg + DMAR_FSTS_REG); + + raw_spin_unlock_irqrestore(&iommu->register_lock, flag); + return IRQ_HANDLED; +} + +int dmar_set_interrupt(struct intel_iommu *iommu) +{ + int irq, ret; + + /* + * Check if the fault interrupt is already initialized. + */ + if (iommu->irq) + return 0; + + irq = create_irq(); + if (!irq) { + printk(KERN_ERR "IOMMU: no free vectors\n"); + return -EINVAL; + } + + irq_set_handler_data(irq, iommu); + iommu->irq = irq; + + ret = arch_setup_dmar_msi(irq); + if (ret) { + irq_set_handler_data(irq, NULL); + iommu->irq = 0; + destroy_irq(irq); + return ret; + } + + ret = request_irq(irq, dmar_fault, IRQF_NO_THREAD, iommu->name, iommu); + if (ret) + printk(KERN_ERR "IOMMU: can't request irq\n"); + return ret; +} + +int __init enable_drhd_fault_handling(void) +{ + struct dmar_drhd_unit *drhd; + + /* + * Enable fault control interrupt. + */ + for_each_drhd_unit(drhd) { + int ret; + struct intel_iommu *iommu = drhd->iommu; + ret = dmar_set_interrupt(iommu); + + if (ret) { + printk(KERN_ERR "DRHD %Lx: failed to enable fault, " + " interrupt, ret %d\n", + (unsigned long long)drhd->reg_base_addr, ret); + return -1; + } + + /* + * Clear any previous faults. + */ + dmar_fault(iommu->irq, iommu); + } + + return 0; +} + +/* + * Re-enable Queued Invalidation interface. + */ +int dmar_reenable_qi(struct intel_iommu *iommu) +{ + if (!ecap_qis(iommu->ecap)) + return -ENOENT; + + if (!iommu->qi) + return -ENOENT; + + /* + * First disable queued invalidation. + */ + dmar_disable_qi(iommu); + /* + * Then enable queued invalidation again. Since there is no pending + * invalidation requests now, it's safe to re-enable queued + * invalidation. + */ + __dmar_enable_qi(iommu); + + return 0; +} + +/* + * Check interrupt remapping support in DMAR table description. + */ +int __init dmar_ir_support(void) +{ + struct acpi_table_dmar *dmar; + dmar = (struct acpi_table_dmar *)dmar_tbl; + if (!dmar) + return 0; + return dmar->flags & 0x1; +} +IOMMU_INIT_POST(detect_intel_iommu); |
