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Diffstat (limited to 'drivers/pci/intel-iommu.c')
-rw-r--r--drivers/pci/intel-iommu.c416
1 files changed, 250 insertions, 166 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 2314ad7ee5fe..b1e97e682500 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -37,6 +37,8 @@
#include <linux/iommu.h>
#include <linux/intel-iommu.h>
#include <linux/sysdev.h>
+#include <linux/tboot.h>
+#include <linux/dmi.h>
#include <asm/cacheflush.h>
#include <asm/iommu.h>
#include "pci.h"
@@ -46,6 +48,7 @@
#define IS_GFX_DEVICE(pdev) ((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY)
#define IS_ISA_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA)
+#define IS_AZALIA(pdev) ((pdev)->vendor == 0x8086 && (pdev)->device == 0x3a3e)
#define IOAPIC_RANGE_START (0xfee00000)
#define IOAPIC_RANGE_END (0xfeefffff)
@@ -55,8 +58,14 @@
#define MAX_AGAW_WIDTH 64
-#define DOMAIN_MAX_ADDR(gaw) ((((u64)1) << gaw) - 1)
-#define DOMAIN_MAX_PFN(gaw) ((((u64)1) << (gaw-VTD_PAGE_SHIFT)) - 1)
+#define __DOMAIN_MAX_PFN(gaw) ((((uint64_t)1) << (gaw-VTD_PAGE_SHIFT)) - 1)
+#define __DOMAIN_MAX_ADDR(gaw) ((((uint64_t)1) << gaw) - 1)
+
+/* We limit DOMAIN_MAX_PFN to fit in an unsigned long, and DOMAIN_MAX_ADDR
+ to match. That way, we can use 'unsigned long' for PFNs with impunity. */
+#define DOMAIN_MAX_PFN(gaw) ((unsigned long) min_t(uint64_t, \
+ __DOMAIN_MAX_PFN(gaw), (unsigned long)-1))
+#define DOMAIN_MAX_ADDR(gaw) (((uint64_t)__DOMAIN_MAX_PFN(gaw)) << VTD_PAGE_SHIFT)
#define IOVA_PFN(addr) ((addr) >> PAGE_SHIFT)
#define DMA_32BIT_PFN IOVA_PFN(DMA_BIT_MASK(32))
@@ -86,6 +95,7 @@ static inline unsigned long virt_to_dma_pfn(void *p)
/* global iommu list, set NULL for ignored DMAR units */
static struct intel_iommu **g_iommus;
+static void __init check_tylersburg_isoch(void);
static int rwbf_quirk;
/*
@@ -251,7 +261,8 @@ static inline int first_pte_in_page(struct dma_pte *pte)
* 2. It maps to each iommu if successful.
* 3. Each iommu mapps to this domain if successful.
*/
-struct dmar_domain *si_domain;
+static struct dmar_domain *si_domain;
+static int hw_pass_through = 1;
/* devices under the same p2p bridge are owned in one domain */
#define DOMAIN_FLAG_P2P_MULTIPLE_DEVICES (1 << 0)
@@ -727,7 +738,7 @@ static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain,
return NULL;
domain_flush_cache(domain, tmp_page, VTD_PAGE_SIZE);
- pteval = (virt_to_dma_pfn(tmp_page) << VTD_PAGE_SHIFT) | DMA_PTE_READ | DMA_PTE_WRITE;
+ pteval = ((uint64_t)virt_to_dma_pfn(tmp_page) << VTD_PAGE_SHIFT) | DMA_PTE_READ | DMA_PTE_WRITE;
if (cmpxchg64(&pte->val, 0ULL, pteval)) {
/* Someone else set it while we were thinking; use theirs. */
free_pgtable_page(tmp_page);
@@ -777,9 +788,10 @@ static void dma_pte_clear_range(struct dmar_domain *domain,
BUG_ON(addr_width < BITS_PER_LONG && start_pfn >> addr_width);
BUG_ON(addr_width < BITS_PER_LONG && last_pfn >> addr_width);
+ BUG_ON(start_pfn > last_pfn);
/* we don't need lock here; nobody else touches the iova range */
- while (start_pfn <= last_pfn) {
+ do {
first_pte = pte = dma_pfn_level_pte(domain, start_pfn, 1);
if (!pte) {
start_pfn = align_to_level(start_pfn + 1, 2);
@@ -793,7 +805,8 @@ static void dma_pte_clear_range(struct dmar_domain *domain,
domain_flush_cache(domain, first_pte,
(void *)pte - (void *)first_pte);
- }
+
+ } while (start_pfn && start_pfn <= last_pfn);
}
/* free page table pages. last level pte should already be cleared */
@@ -809,6 +822,7 @@ static void dma_pte_free_pagetable(struct dmar_domain *domain,
BUG_ON(addr_width < BITS_PER_LONG && start_pfn >> addr_width);
BUG_ON(addr_width < BITS_PER_LONG && last_pfn >> addr_width);
+ BUG_ON(start_pfn > last_pfn);
/* We don't need lock here; nobody else touches the iova range */
level = 2;
@@ -819,7 +833,7 @@ static void dma_pte_free_pagetable(struct dmar_domain *domain,
if (tmp + level_size(level) - 1 > last_pfn)
return;
- while (tmp + level_size(level) - 1 <= last_pfn) {
+ do {
first_pte = pte = dma_pfn_level_pte(domain, tmp, level);
if (!pte) {
tmp = align_to_level(tmp + 1, level + 1);
@@ -838,7 +852,7 @@ static void dma_pte_free_pagetable(struct dmar_domain *domain,
domain_flush_cache(domain, first_pte,
(void *)pte - (void *)first_pte);
- }
+ } while (tmp && tmp + level_size(level) - 1 <= last_pfn);
level++;
}
/* free pgd */
@@ -1157,6 +1171,8 @@ static int iommu_init_domains(struct intel_iommu *iommu)
pr_debug("Number of Domains supportd <%ld>\n", ndomains);
nlongs = BITS_TO_LONGS(ndomains);
+ spin_lock_init(&iommu->lock);
+
/* TBD: there might be 64K domains,
* consider other allocation for future chip
*/
@@ -1169,12 +1185,9 @@ static int iommu_init_domains(struct intel_iommu *iommu)
GFP_KERNEL);
if (!iommu->domains) {
printk(KERN_ERR "Allocating domain array failed\n");
- kfree(iommu->domain_ids);
return -ENOMEM;
}
- spin_lock_init(&iommu->lock);
-
/*
* if Caching mode is set, then invalid translations are tagged
* with domainid 0. Hence we need to pre-allocate it.
@@ -1194,22 +1207,24 @@ void free_dmar_iommu(struct intel_iommu *iommu)
int i;
unsigned long flags;
- i = find_first_bit(iommu->domain_ids, cap_ndoms(iommu->cap));
- for (; i < cap_ndoms(iommu->cap); ) {
- domain = iommu->domains[i];
- clear_bit(i, iommu->domain_ids);
+ if ((iommu->domains) && (iommu->domain_ids)) {
+ i = find_first_bit(iommu->domain_ids, cap_ndoms(iommu->cap));
+ for (; i < cap_ndoms(iommu->cap); ) {
+ domain = iommu->domains[i];
+ clear_bit(i, iommu->domain_ids);
+
+ spin_lock_irqsave(&domain->iommu_lock, flags);
+ if (--domain->iommu_count == 0) {
+ if (domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE)
+ vm_domain_exit(domain);
+ else
+ domain_exit(domain);
+ }
+ spin_unlock_irqrestore(&domain->iommu_lock, flags);
- spin_lock_irqsave(&domain->iommu_lock, flags);
- if (--domain->iommu_count == 0) {
- if (domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE)
- vm_domain_exit(domain);
- else
- domain_exit(domain);
+ i = find_next_bit(iommu->domain_ids,
+ cap_ndoms(iommu->cap), i+1);
}
- spin_unlock_irqrestore(&domain->iommu_lock, flags);
-
- i = find_next_bit(iommu->domain_ids,
- cap_ndoms(iommu->cap), i+1);
}
if (iommu->gcmd & DMA_GCMD_TE)
@@ -1309,7 +1324,6 @@ static void iommu_detach_domain(struct dmar_domain *domain,
}
static struct iova_domain reserved_iova_list;
-static struct lock_class_key reserved_alloc_key;
static struct lock_class_key reserved_rbtree_key;
static void dmar_init_reserved_ranges(void)
@@ -1320,8 +1334,6 @@ static void dmar_init_reserved_ranges(void)
init_iova_domain(&reserved_iova_list, DMA_32BIT_PFN);
- lockdep_set_class(&reserved_iova_list.iova_alloc_lock,
- &reserved_alloc_key);
lockdep_set_class(&reserved_iova_list.iova_rbtree_lock,
&reserved_rbtree_key);
@@ -1924,6 +1936,9 @@ error:
}
static int iommu_identity_mapping;
+#define IDENTMAP_ALL 1
+#define IDENTMAP_GFX 2
+#define IDENTMAP_AZALIA 4
static int iommu_domain_identity_map(struct dmar_domain *domain,
unsigned long long start,
@@ -1958,14 +1973,35 @@ static int iommu_prepare_identity_map(struct pci_dev *pdev,
struct dmar_domain *domain;
int ret;
- printk(KERN_INFO
- "IOMMU: Setting identity map for device %s [0x%Lx - 0x%Lx]\n",
- pci_name(pdev), start, end);
-
domain = get_domain_for_dev(pdev, DEFAULT_DOMAIN_ADDRESS_WIDTH);
if (!domain)
return -ENOMEM;
+ /* For _hardware_ passthrough, don't bother. But for software
+ passthrough, we do it anyway -- it may indicate a memory
+ range which is reserved in E820, so which didn't get set
+ up to start with in si_domain */
+ if (domain == si_domain && hw_pass_through) {
+ printk("Ignoring identity map for HW passthrough device %s [0x%Lx - 0x%Lx]\n",
+ pci_name(pdev), start, end);
+ return 0;
+ }
+
+ printk(KERN_INFO
+ "IOMMU: Setting identity map for device %s [0x%Lx - 0x%Lx]\n",
+ pci_name(pdev), start, end);
+
+ if (end >> agaw_to_width(domain->agaw)) {
+ WARN(1, "Your BIOS is broken; RMRR exceeds permitted address width (%d bits)\n"
+ "BIOS vendor: %s; Ver: %s; Product Version: %s\n",
+ agaw_to_width(domain->agaw),
+ dmi_get_system_info(DMI_BIOS_VENDOR),
+ dmi_get_system_info(DMI_BIOS_VERSION),
+ dmi_get_system_info(DMI_PRODUCT_VERSION));
+ ret = -EIO;
+ goto error;
+ }
+
ret = iommu_domain_identity_map(domain, start, end);
if (ret)
goto error;
@@ -2016,23 +2052,6 @@ static inline void iommu_prepare_isa(void)
}
#endif /* !CONFIG_DMAR_FLPY_WA */
-/* Initialize each context entry as pass through.*/
-static int __init init_context_pass_through(void)
-{
- struct pci_dev *pdev = NULL;
- struct dmar_domain *domain;
- int ret;
-
- for_each_pci_dev(pdev) {
- domain = get_domain_for_dev(pdev, DEFAULT_DOMAIN_ADDRESS_WIDTH);
- ret = domain_context_mapping(domain, pdev,
- CONTEXT_TT_PASS_THROUGH);
- if (ret)
- return ret;
- }
- return 0;
-}
-
static int md_domain_init(struct dmar_domain *domain, int guest_width);
static int __init si_domain_work_fn(unsigned long start_pfn,
@@ -2047,7 +2066,7 @@ static int __init si_domain_work_fn(unsigned long start_pfn,
}
-static int si_domain_init(void)
+static int __init si_domain_init(int hw)
{
struct dmar_drhd_unit *drhd;
struct intel_iommu *iommu;
@@ -2074,6 +2093,9 @@ static int si_domain_init(void)
si_domain->flags = DOMAIN_FLAG_STATIC_IDENTITY;
+ if (hw)
+ return 0;
+
for_each_online_node(nid) {
work_with_active_regions(nid, si_domain_work_fn, &ret);
if (ret)
@@ -2100,15 +2122,23 @@ static int identity_mapping(struct pci_dev *pdev)
}
static int domain_add_dev_info(struct dmar_domain *domain,
- struct pci_dev *pdev)
+ struct pci_dev *pdev,
+ int translation)
{
struct device_domain_info *info;
unsigned long flags;
+ int ret;
info = alloc_devinfo_mem();
if (!info)
return -ENOMEM;
+ ret = domain_context_mapping(domain, pdev, translation);
+ if (ret) {
+ free_devinfo_mem(info);
+ return ret;
+ }
+
info->segment = pci_domain_nr(pdev->bus);
info->bus = pdev->bus->number;
info->devfn = pdev->devfn;
@@ -2126,8 +2156,14 @@ static int domain_add_dev_info(struct dmar_domain *domain,
static int iommu_should_identity_map(struct pci_dev *pdev, int startup)
{
- if (iommu_identity_mapping == 2)
- return IS_GFX_DEVICE(pdev);
+ if ((iommu_identity_mapping & IDENTMAP_AZALIA) && IS_AZALIA(pdev))
+ return 1;
+
+ if ((iommu_identity_mapping & IDENTMAP_GFX) && IS_GFX_DEVICE(pdev))
+ return 1;
+
+ if (!(iommu_identity_mapping & IDENTMAP_ALL))
+ return 0;
/*
* We want to start off with all devices in the 1:1 domain, and
@@ -2165,27 +2201,25 @@ static int iommu_should_identity_map(struct pci_dev *pdev, int startup)
return 1;
}
-static int iommu_prepare_static_identity_mapping(void)
+static int __init iommu_prepare_static_identity_mapping(int hw)
{
struct pci_dev *pdev = NULL;
int ret;
- ret = si_domain_init();
+ ret = si_domain_init(hw);
if (ret)
return -EFAULT;
for_each_pci_dev(pdev) {
if (iommu_should_identity_map(pdev, 1)) {
- printk(KERN_INFO "IOMMU: identity mapping for device %s\n",
- pci_name(pdev));
+ printk(KERN_INFO "IOMMU: %s identity mapping for device %s\n",
+ hw ? "hardware" : "software", pci_name(pdev));
- ret = domain_context_mapping(si_domain, pdev,
+ ret = domain_add_dev_info(si_domain, pdev,
+ hw ? CONTEXT_TT_PASS_THROUGH :
CONTEXT_TT_MULTI_LEVEL);
if (ret)
return ret;
- ret = domain_add_dev_info(si_domain, pdev);
- if (ret)
- return ret;
}
}
@@ -2199,14 +2233,6 @@ int __init init_dmars(void)
struct pci_dev *pdev;
struct intel_iommu *iommu;
int i, ret;
- int pass_through = 1;
-
- /*
- * In case pass through can not be enabled, iommu tries to use identity
- * mapping.
- */
- if (iommu_pass_through)
- iommu_identity_mapping = 1;
/*
* for each drhd
@@ -2234,7 +2260,6 @@ int __init init_dmars(void)
deferred_flush = kzalloc(g_num_of_iommus *
sizeof(struct deferred_flush_tables), GFP_KERNEL);
if (!deferred_flush) {
- kfree(g_iommus);
ret = -ENOMEM;
goto error;
}
@@ -2261,14 +2286,8 @@ int __init init_dmars(void)
goto error;
}
if (!ecap_pass_through(iommu->ecap))
- pass_through = 0;
+ hw_pass_through = 0;
}
- if (iommu_pass_through)
- if (!pass_through) {
- printk(KERN_INFO
- "Pass Through is not supported by hardware.\n");
- iommu_pass_through = 0;
- }
/*
* Start from the sane iommu hardware state.
@@ -2323,64 +2342,60 @@ int __init init_dmars(void)
}
}
+ if (iommu_pass_through)
+ iommu_identity_mapping |= IDENTMAP_ALL;
+
+#ifdef CONFIG_DMAR_BROKEN_GFX_WA
+ iommu_identity_mapping |= IDENTMAP_GFX;
+#endif
+
+ check_tylersburg_isoch();
+
/*
- * If pass through is set and enabled, context entries of all pci
- * devices are intialized by pass through translation type.
+ * If pass through is not set or not enabled, setup context entries for
+ * identity mappings for rmrr, gfx, and isa and may fall back to static
+ * identity mapping if iommu_identity_mapping is set.
*/
- if (iommu_pass_through) {
- ret = init_context_pass_through();
+ if (iommu_identity_mapping) {
+ ret = iommu_prepare_static_identity_mapping(hw_pass_through);
if (ret) {
- printk(KERN_ERR "IOMMU: Pass through init failed.\n");
- iommu_pass_through = 0;
+ printk(KERN_CRIT "Failed to setup IOMMU pass-through\n");
+ goto error;
}
}
-
/*
- * If pass through is not set or not enabled, setup context entries for
- * identity mappings for rmrr, gfx, and isa and may fall back to static
- * identity mapping if iommu_identity_mapping is set.
+ * For each rmrr
+ * for each dev attached to rmrr
+ * do
+ * locate drhd for dev, alloc domain for dev
+ * allocate free domain
+ * allocate page table entries for rmrr
+ * if context not allocated for bus
+ * allocate and init context
+ * set present in root table for this bus
+ * init context with domain, translation etc
+ * endfor
+ * endfor
*/
- if (!iommu_pass_through) {
-#ifdef CONFIG_DMAR_BROKEN_GFX_WA
- if (!iommu_identity_mapping)
- iommu_identity_mapping = 2;
-#endif
- if (iommu_identity_mapping)
- iommu_prepare_static_identity_mapping();
- /*
- * For each rmrr
- * for each dev attached to rmrr
- * do
- * locate drhd for dev, alloc domain for dev
- * allocate free domain
- * allocate page table entries for rmrr
- * if context not allocated for bus
- * allocate and init context
- * set present in root table for this bus
- * init context with domain, translation etc
- * endfor
- * endfor
- */
- printk(KERN_INFO "IOMMU: Setting RMRR:\n");
- for_each_rmrr_units(rmrr) {
- for (i = 0; i < rmrr->devices_cnt; i++) {
- pdev = rmrr->devices[i];
- /*
- * some BIOS lists non-exist devices in DMAR
- * table.
- */
- if (!pdev)
- continue;
- ret = iommu_prepare_rmrr_dev(rmrr, pdev);
- if (ret)
- printk(KERN_ERR
- "IOMMU: mapping reserved region failed\n");
- }
+ printk(KERN_INFO "IOMMU: Setting RMRR:\n");
+ for_each_rmrr_units(rmrr) {
+ for (i = 0; i < rmrr->devices_cnt; i++) {
+ pdev = rmrr->devices[i];
+ /*
+ * some BIOS lists non-exist devices in DMAR
+ * table.
+ */
+ if (!pdev)
+ continue;
+ ret = iommu_prepare_rmrr_dev(rmrr, pdev);
+ if (ret)
+ printk(KERN_ERR
+ "IOMMU: mapping reserved region failed\n");
}
-
- iommu_prepare_isa();
}
+ iommu_prepare_isa();
+
/*
* for each drhd
* enable fault log
@@ -2403,11 +2418,12 @@ int __init init_dmars(void)
iommu->flush.flush_context(iommu, 0, 0, 0, DMA_CCMD_GLOBAL_INVL);
iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
- iommu_disable_protect_mem_regions(iommu);
ret = iommu_enable_translation(iommu);
if (ret)
goto error;
+
+ iommu_disable_protect_mem_regions(iommu);
}
return 0;
@@ -2454,8 +2470,7 @@ static struct iova *intel_alloc_iova(struct device *dev,
return iova;
}
-static struct dmar_domain *
-get_valid_domain_for_dev(struct pci_dev *pdev)
+static struct dmar_domain *__get_valid_domain_for_dev(struct pci_dev *pdev)
{
struct dmar_domain *domain;
int ret;
@@ -2483,6 +2498,18 @@ get_valid_domain_for_dev(struct pci_dev *pdev)
return domain;
}
+static inline struct dmar_domain *get_valid_domain_for_dev(struct pci_dev *dev)
+{
+ struct device_domain_info *info;
+
+ /* No lock here, assumes no domain exit in normal case */
+ info = dev->dev.archdata.iommu;
+ if (likely(info))
+ return info->domain;
+
+ return __get_valid_domain_for_dev(dev);
+}
+
static int iommu_dummy(struct pci_dev *pdev)
{
return pdev->dev.archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO;
@@ -2525,10 +2552,10 @@ static int iommu_no_mapping(struct device *dev)
*/
if (iommu_should_identity_map(pdev, 0)) {
int ret;
- ret = domain_add_dev_info(si_domain, pdev);
- if (ret)
- return 0;
- ret = domain_context_mapping(si_domain, pdev, CONTEXT_TT_MULTI_LEVEL);
+ ret = domain_add_dev_info(si_domain, pdev,
+ hw_pass_through ?
+ CONTEXT_TT_PASS_THROUGH :
+ CONTEXT_TT_MULTI_LEVEL);
if (!ret) {
printk(KERN_INFO "64bit %s uses identity mapping\n",
pci_name(pdev));
@@ -2637,10 +2664,9 @@ static void flush_unmaps(void)
unsigned long mask;
struct iova *iova = deferred_flush[i].iova[j];
- mask = (iova->pfn_hi - iova->pfn_lo + 1) << PAGE_SHIFT;
- mask = ilog2(mask >> VTD_PAGE_SHIFT);
+ mask = ilog2(mm_to_dma_pfn(iova->pfn_hi - iova->pfn_lo + 1));
iommu_flush_dev_iotlb(deferred_flush[i].domain[j],
- iova->pfn_lo << PAGE_SHIFT, mask);
+ (uint64_t)iova->pfn_lo << PAGE_SHIFT, mask);
__free_iova(&deferred_flush[i].domain[j]->iovad, iova);
}
deferred_flush[i].next = 0;
@@ -2733,12 +2759,6 @@ static void intel_unmap_page(struct device *dev, dma_addr_t dev_addr,
}
}
-static void intel_unmap_single(struct device *dev, dma_addr_t dev_addr, size_t size,
- int dir)
-{
- intel_unmap_page(dev, dev_addr, size, dir, NULL);
-}
-
static void *intel_alloc_coherent(struct device *hwdev, size_t size,
dma_addr_t *dma_handle, gfp_t flags)
{
@@ -2771,7 +2791,7 @@ static void intel_free_coherent(struct device *hwdev, size_t size, void *vaddr,
size = PAGE_ALIGN(size);
order = get_order(size);
- intel_unmap_single(hwdev, dma_handle, size, DMA_BIDIRECTIONAL);
+ intel_unmap_page(hwdev, dma_handle, size, DMA_BIDIRECTIONAL, NULL);
free_pages((unsigned long)vaddr, order);
}
@@ -2807,11 +2827,18 @@ static void intel_unmap_sg(struct device *hwdev, struct scatterlist *sglist,
/* free page tables */
dma_pte_free_pagetable(domain, start_pfn, last_pfn);
- iommu_flush_iotlb_psi(iommu, domain->id, start_pfn,
- (last_pfn - start_pfn + 1));
-
- /* free iova */
- __free_iova(&domain->iovad, iova);
+ if (intel_iommu_strict) {
+ iommu_flush_iotlb_psi(iommu, domain->id, start_pfn,
+ last_pfn - start_pfn + 1);
+ /* free iova */
+ __free_iova(&domain->iovad, iova);
+ } else {
+ add_unmap(domain, iova);
+ /*
+ * queue up the release of the unmap to save the 1/6th of the
+ * cpu used up by the iotlb flush operation...
+ */
+ }
}
static int intel_nontranslate_map_sg(struct device *hddev,
@@ -3055,8 +3082,8 @@ static int init_iommu_hw(void)
DMA_CCMD_GLOBAL_INVL);
iommu->flush.flush_iotlb(iommu, 0, 0, 0,
DMA_TLB_GLOBAL_FLUSH);
- iommu_disable_protect_mem_regions(iommu);
iommu_enable_translation(iommu);
+ iommu_disable_protect_mem_regions(iommu);
}
return 0;
@@ -3183,18 +3210,28 @@ static int __init init_iommu_sysfs(void)
int __init intel_iommu_init(void)
{
int ret = 0;
+ int force_on = 0;
+
+ /* VT-d is required for a TXT/tboot launch, so enforce that */
+ force_on = tboot_force_iommu();
- if (dmar_table_init())
+ if (dmar_table_init()) {
+ if (force_on)
+ panic("tboot: Failed to initialize DMAR table\n");
return -ENODEV;
+ }
- if (dmar_dev_scope_init())
+ if (dmar_dev_scope_init()) {
+ if (force_on)
+ panic("tboot: Failed to initialize DMAR device scope\n");
return -ENODEV;
+ }
/*
* Check the need for DMA-remapping initialization now.
* Above initialization will also be used by Interrupt-remapping.
*/
- if (no_iommu || (swiotlb && !iommu_pass_through) || dmar_disabled)
+ if (no_iommu || swiotlb || dmar_disabled)
return -ENODEV;
iommu_init_mempool();
@@ -3204,6 +3241,8 @@ int __init intel_iommu_init(void)
ret = init_dmars();
if (ret) {
+ if (force_on)
+ panic("tboot: Failed to initialize DMARs\n");
printk(KERN_ERR "IOMMU: dmar init failed\n");
put_iova_domain(&reserved_iova_list);
iommu_exit_mempool();
@@ -3214,14 +3253,7 @@ int __init intel_iommu_init(void)
init_timer(&unmap_timer);
force_iommu = 1;
-
- if (!iommu_pass_through) {
- printk(KERN_INFO
- "Multi-level page-table translation for DMAR.\n");
- dma_ops = &intel_dma_ops;
- } else
- printk(KERN_INFO
- "DMAR: Pass through translation for DMAR.\n");
+ dma_ops = &intel_dma_ops;
init_iommu_sysfs();
@@ -3504,7 +3536,6 @@ static int intel_iommu_attach_device(struct iommu_domain *domain,
struct intel_iommu *iommu;
int addr_width;
u64 end;
- int ret;
/* normally pdev is not mapped */
if (unlikely(domain_context_mapped(pdev))) {
@@ -3536,12 +3567,7 @@ static int intel_iommu_attach_device(struct iommu_domain *domain,
return -EFAULT;
}
- ret = domain_add_dev_info(dmar_domain, pdev);
- if (ret)
- return ret;
-
- ret = domain_context_mapping(dmar_domain, pdev, CONTEXT_TT_MULTI_LEVEL);
- return ret;
+ return domain_add_dev_info(dmar_domain, pdev, CONTEXT_TT_MULTI_LEVEL);
}
static void intel_iommu_detach_device(struct iommu_domain *domain,
@@ -3658,3 +3684,61 @@ static void __devinit quirk_iommu_rwbf(struct pci_dev *dev)
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2a40, quirk_iommu_rwbf);
+
+/* On Tylersburg chipsets, some BIOSes have been known to enable the
+ ISOCH DMAR unit for the Azalia sound device, but not give it any
+ TLB entries, which causes it to deadlock. Check for that. We do
+ this in a function called from init_dmars(), instead of in a PCI
+ quirk, because we don't want to print the obnoxious "BIOS broken"
+ message if VT-d is actually disabled.
+*/
+static void __init check_tylersburg_isoch(void)
+{
+ struct pci_dev *pdev;
+ uint32_t vtisochctrl;
+
+ /* If there's no Azalia in the system anyway, forget it. */
+ pdev = pci_get_device(PCI_VENDOR_ID_INTEL, 0x3a3e, NULL);
+ if (!pdev)
+ return;
+ pci_dev_put(pdev);
+
+ /* System Management Registers. Might be hidden, in which case
+ we can't do the sanity check. But that's OK, because the
+ known-broken BIOSes _don't_ actually hide it, so far. */
+ pdev = pci_get_device(PCI_VENDOR_ID_INTEL, 0x342e, NULL);
+ if (!pdev)
+ return;
+
+ if (pci_read_config_dword(pdev, 0x188, &vtisochctrl)) {
+ pci_dev_put(pdev);
+ return;
+ }
+
+ pci_dev_put(pdev);
+
+ /* If Azalia DMA is routed to the non-isoch DMAR unit, fine. */
+ if (vtisochctrl & 1)
+ return;
+
+ /* Drop all bits other than the number of TLB entries */
+ vtisochctrl &= 0x1c;
+
+ /* If we have the recommended number of TLB entries (16), fine. */
+ if (vtisochctrl == 0x10)
+ return;
+
+ /* Zero TLB entries? You get to ride the short bus to school. */
+ if (!vtisochctrl) {
+ WARN(1, "Your BIOS is broken; DMA routed to ISOCH DMAR unit but no TLB space.\n"
+ "BIOS vendor: %s; Ver: %s; Product Version: %s\n",
+ dmi_get_system_info(DMI_BIOS_VENDOR),
+ dmi_get_system_info(DMI_BIOS_VERSION),
+ dmi_get_system_info(DMI_PRODUCT_VERSION));
+ iommu_identity_mapping |= IDENTMAP_AZALIA;
+ return;
+ }
+
+ printk(KERN_WARNING "DMAR: Recommended TLB entries for ISOCH unit is 16; your BIOS set %d\n",
+ vtisochctrl);
+}
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-07-09 05:21:21 +0200