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-rw-r--r--Documentation/admin-guide/kernel-parameters.txt12
-rw-r--r--drivers/iommu/intel-iommu.c64
-rw-r--r--include/linux/intel-iommu.h1
3 files changed, 24 insertions, 53 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 81d1d5a74728..abe9769a9276 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1682,12 +1682,12 @@
By default, super page will be supported if Intel IOMMU
has the capability. With this option, super page will
not be supported.
- ecs_off [Default Off]
- By default, extended context tables will be supported if
- the hardware advertises that it has support both for the
- extended tables themselves, and also PASID support. With
- this option set, extended tables will not be used even
- on hardware which claims to support them.
+ sm_off [Default Off]
+ By default, scalable mode will be supported if the
+ hardware advertises that it has support for the scalable
+ mode translation. With this option set, scalable mode
+ will not be used even on hardware which claims to support
+ it.
tboot_noforce [Default Off]
Do not force the Intel IOMMU enabled under tboot.
By default, tboot will force Intel IOMMU on, which
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index fdf79baf1d79..2b9784a1887b 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -405,38 +405,16 @@ static int dmar_map_gfx = 1;
static int dmar_forcedac;
static int intel_iommu_strict;
static int intel_iommu_superpage = 1;
-static int intel_iommu_ecs = 1;
-static int intel_iommu_pasid28;
+static int intel_iommu_sm = 1;
static int iommu_identity_mapping;
#define IDENTMAP_ALL 1
#define IDENTMAP_GFX 2
#define IDENTMAP_AZALIA 4
-/* Broadwell and Skylake have broken ECS support — normal so-called "second
- * level" translation of DMA requests-without-PASID doesn't actually happen
- * unless you also set the NESTE bit in an extended context-entry. Which of
- * course means that SVM doesn't work because it's trying to do nested
- * translation of the physical addresses it finds in the process page tables,
- * through the IOVA->phys mapping found in the "second level" page tables.
- *
- * The VT-d specification was retroactively changed to change the definition
- * of the capability bits and pretend that Broadwell/Skylake never happened...
- * but unfortunately the wrong bit was changed. It's ECS which is broken, but
- * for some reason it was the PASID capability bit which was redefined (from
- * bit 28 on BDW/SKL to bit 40 in future).
- *
- * So our test for ECS needs to eschew those implementations which set the old
- * PASID capabiity bit 28, since those are the ones on which ECS is broken.
- * Unless we are working around the 'pasid28' limitations, that is, by putting
- * the device into passthrough mode for normal DMA and thus masking the bug.
- */
-#define ecs_enabled(iommu) (intel_iommu_ecs && ecap_ecs(iommu->ecap) && \
- (intel_iommu_pasid28 || !ecap_broken_pasid(iommu->ecap)))
-/* PASID support is thus enabled if ECS is enabled and *either* of the old
- * or new capability bits are set. */
-#define pasid_enabled(iommu) (ecs_enabled(iommu) && \
- (ecap_pasid(iommu->ecap) || ecap_broken_pasid(iommu->ecap)))
+#define sm_supported(iommu) (intel_iommu_sm && ecap_smts((iommu)->ecap))
+#define pasid_supported(iommu) (sm_supported(iommu) && \
+ ecap_pasid((iommu)->ecap))
int intel_iommu_gfx_mapped;
EXPORT_SYMBOL_GPL(intel_iommu_gfx_mapped);
@@ -516,15 +494,9 @@ static int __init intel_iommu_setup(char *str)
} else if (!strncmp(str, "sp_off", 6)) {
pr_info("Disable supported super page\n");
intel_iommu_superpage = 0;
- } else if (!strncmp(str, "ecs_off", 7)) {
- printk(KERN_INFO
- "Intel-IOMMU: disable extended context table support\n");
- intel_iommu_ecs = 0;
- } else if (!strncmp(str, "pasid28", 7)) {
- printk(KERN_INFO
- "Intel-IOMMU: enable pre-production PASID support\n");
- intel_iommu_pasid28 = 1;
- iommu_identity_mapping |= IDENTMAP_GFX;
+ } else if (!strncmp(str, "sm_off", 6)) {
+ pr_info("Intel-IOMMU: disable scalable mode support\n");
+ intel_iommu_sm = 0;
} else if (!strncmp(str, "tboot_noforce", 13)) {
printk(KERN_INFO
"Intel-IOMMU: not forcing on after tboot. This could expose security risk for tboot\n");
@@ -771,7 +743,7 @@ struct context_entry *iommu_context_addr(struct intel_iommu *iommu, u8 bus,
u64 *entry;
entry = &root->lo;
- if (ecs_enabled(iommu)) {
+ if (sm_supported(iommu)) {
if (devfn >= 0x80) {
devfn -= 0x80;
entry = &root->hi;
@@ -913,7 +885,7 @@ static void free_context_table(struct intel_iommu *iommu)
if (context)
free_pgtable_page(context);
- if (!ecs_enabled(iommu))
+ if (!sm_supported(iommu))
continue;
context = iommu_context_addr(iommu, i, 0x80, 0);
@@ -1265,8 +1237,6 @@ static void iommu_set_root_entry(struct intel_iommu *iommu)
unsigned long flag;
addr = virt_to_phys(iommu->root_entry);
- if (ecs_enabled(iommu))
- addr |= DMA_RTADDR_RTT;
raw_spin_lock_irqsave(&iommu->register_lock, flag);
dmar_writeq(iommu->reg + DMAR_RTADDR_REG, addr);
@@ -1755,7 +1725,7 @@ static void free_dmar_iommu(struct intel_iommu *iommu)
free_context_table(iommu);
#ifdef CONFIG_INTEL_IOMMU_SVM
- if (pasid_enabled(iommu)) {
+ if (pasid_supported(iommu)) {
if (ecap_prs(iommu->ecap))
intel_svm_finish_prq(iommu);
intel_svm_exit(iommu);
@@ -2464,8 +2434,8 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
dmar_find_matched_atsr_unit(pdev))
info->ats_supported = 1;
- if (ecs_enabled(iommu)) {
- if (pasid_enabled(iommu)) {
+ if (sm_supported(iommu)) {
+ if (pasid_supported(iommu)) {
int features = pci_pasid_features(pdev);
if (features >= 0)
info->pasid_supported = features | 1;
@@ -3277,7 +3247,7 @@ static int __init init_dmars(void)
* We need to ensure the system pasid table is no bigger
* than the smallest supported.
*/
- if (pasid_enabled(iommu)) {
+ if (pasid_supported(iommu)) {
u32 temp = 2 << ecap_pss(iommu->ecap);
intel_pasid_max_id = min_t(u32, temp,
@@ -3338,7 +3308,7 @@ static int __init init_dmars(void)
if (!ecap_pass_through(iommu->ecap))
hw_pass_through = 0;
#ifdef CONFIG_INTEL_IOMMU_SVM
- if (pasid_enabled(iommu))
+ if (pasid_supported(iommu))
intel_svm_init(iommu);
#endif
}
@@ -3442,7 +3412,7 @@ domains_done:
iommu_flush_write_buffer(iommu);
#ifdef CONFIG_INTEL_IOMMU_SVM
- if (pasid_enabled(iommu) && ecap_prs(iommu->ecap)) {
+ if (pasid_supported(iommu) && ecap_prs(iommu->ecap)) {
ret = intel_svm_enable_prq(iommu);
if (ret)
goto free_iommu;
@@ -4331,7 +4301,7 @@ static int intel_iommu_add(struct dmar_drhd_unit *dmaru)
goto out;
#ifdef CONFIG_INTEL_IOMMU_SVM
- if (pasid_enabled(iommu))
+ if (pasid_supported(iommu))
intel_svm_init(iommu);
#endif
@@ -4348,7 +4318,7 @@ static int intel_iommu_add(struct dmar_drhd_unit *dmaru)
iommu_flush_write_buffer(iommu);
#ifdef CONFIG_INTEL_IOMMU_SVM
- if (pasid_enabled(iommu) && ecap_prs(iommu->ecap)) {
+ if (pasid_supported(iommu) && ecap_prs(iommu->ecap)) {
ret = intel_svm_enable_prq(iommu);
if (ret)
goto disable_iommu;
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index a58bc05d6798..8c9b6063d275 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -177,6 +177,7 @@
* Extended Capability Register
*/
+#define ecap_smts(e) (((e) >> 43) & 0x1)
#define ecap_dit(e) ((e >> 41) & 0x1)
#define ecap_pasid(e) ((e >> 40) & 0x1)
#define ecap_pss(e) ((e >> 35) & 0x1f)
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-15 21:34:38 +0100