#include <linux/mempool.h>
#include <linux/memory.h>
#include <linux/timer.h>
+#include <linux/io.h>
#include <linux/iova.h>
#include <linux/iommu.h>
#include <linux/intel-iommu.h>
struct list_head global; /* link to global list */
u8 bus; /* PCI bus number */
u8 devfn; /* PCI devfn number */
- struct {
- u8 enabled:1;
- u8 qdep;
- } ats; /* ATS state */
+ u8 pasid_supported:3;
+ u8 pasid_enabled:1;
+ u8 pri_supported:1;
+ u8 pri_enabled:1;
+ u8 ats_supported:1;
+ u8 ats_enabled:1;
+ u8 ats_qdep;
struct device *dev; /* it's NULL for PCIe-to-PCI bridge */
struct intel_iommu *iommu; /* IOMMU used by this device */
struct dmar_domain *domain; /* pointer to domain */
static int intel_iommu_strict;
static int intel_iommu_superpage = 1;
static int intel_iommu_ecs = 1;
+static int intel_iommu_pasid28;
+static int iommu_identity_mapping;
+
+#define IDENTMAP_ALL 1
+#define IDENTMAP_GFX 2
+#define IDENTMAP_AZALIA 4
-/* We only actually use ECS when PASID support (on the new bit 40)
- * is also advertised. Some early implementations — the ones with
- * PASID support on bit 28 — have issues even when we *only* use
- * extended root/context tables. */
+/* 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) && \
- ecap_pasid(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)))
int intel_iommu_gfx_mapped;
EXPORT_SYMBOL_GPL(intel_iommu_gfx_mapped);
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;
}
str += strcspn(str, ",");
iommu_support_dev_iotlb (struct dmar_domain *domain, struct intel_iommu *iommu,
u8 bus, u8 devfn)
{
- bool found = false;
struct device_domain_info *info;
- struct pci_dev *pdev;
assert_spin_locked(&device_domain_lock);
- if (!ecap_dev_iotlb_support(iommu->ecap))
- return NULL;
-
if (!iommu->qi)
return NULL;
list_for_each_entry(info, &domain->devices, link)
if (info->iommu == iommu && info->bus == bus &&
info->devfn == devfn) {
- found = true;
+ if (info->ats_supported && info->dev)
+ return info;
break;
}
- if (!found || !info->dev || !dev_is_pci(info->dev))
- return NULL;
-
- pdev = to_pci_dev(info->dev);
-
- if (!pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ATS))
- return NULL;
-
- if (!dmar_find_matched_atsr_unit(pdev))
- return NULL;
-
- return info;
+ return NULL;
}
static void iommu_enable_dev_iotlb(struct device_domain_info *info)
return;
pdev = to_pci_dev(info->dev);
- if (pci_enable_ats(pdev, VTD_PAGE_SHIFT))
- return;
- info->ats.enabled = 1;
- info->ats.qdep = pci_ats_queue_depth(pdev);
+#ifdef CONFIG_INTEL_IOMMU_SVM
+ /* The PCIe spec, in its wisdom, declares that the behaviour of
+ the device if you enable PASID support after ATS support is
+ undefined. So always enable PASID support on devices which
+ have it, even if we can't yet know if we're ever going to
+ use it. */
+ if (info->pasid_supported && !pci_enable_pasid(pdev, info->pasid_supported & ~1))
+ info->pasid_enabled = 1;
+
+ if (info->pri_supported && !pci_reset_pri(pdev) && !pci_enable_pri(pdev, 32))
+ info->pri_enabled = 1;
+#endif
+ if (info->ats_supported && !pci_enable_ats(pdev, VTD_PAGE_SHIFT)) {
+ info->ats_enabled = 1;
+ info->ats_qdep = pci_ats_queue_depth(pdev);
+ }
}
static void iommu_disable_dev_iotlb(struct device_domain_info *info)
{
- if (!info->ats.enabled)
+ struct pci_dev *pdev;
+
+ if (dev_is_pci(info->dev))
return;
- pci_disable_ats(to_pci_dev(info->dev));
- info->ats.enabled = 0;
+ pdev = to_pci_dev(info->dev);
+
+ if (info->ats_enabled) {
+ pci_disable_ats(pdev);
+ info->ats_enabled = 0;
+ }
+#ifdef CONFIG_INTEL_IOMMU_SVM
+ if (info->pri_enabled) {
+ pci_disable_pri(pdev);
+ info->pri_enabled = 0;
+ }
+ if (info->pasid_enabled) {
+ pci_disable_pasid(pdev);
+ info->pasid_enabled = 0;
+ }
+#endif
}
static void iommu_flush_dev_iotlb(struct dmar_domain *domain,
spin_lock_irqsave(&device_domain_lock, flags);
list_for_each_entry(info, &domain->devices, link) {
- if (!info->ats.enabled)
+ if (!info->ats_enabled)
continue;
sid = info->bus << 8 | info->devfn;
- qdep = info->ats.qdep;
+ qdep = info->ats_qdep;
qi_flush_dev_iotlb(info->iommu, sid, qdep, addr, mask);
}
spin_unlock_irqrestore(&device_domain_lock, flags);
/* free context mapping */
free_context_table(iommu);
+
+#ifdef CONFIG_INTEL_IOMMU_SVM
+ if (pasid_enabled(iommu)) {
+ if (ecap_prs(iommu->ecap))
+ intel_svm_finish_prq(iommu);
+ intel_svm_free_pasid_tables(iommu);
+ }
+#endif
}
static struct dmar_domain *alloc_domain(int flags)
}
info = iommu_support_dev_iotlb(domain, iommu, bus, devfn);
- translation = info ? CONTEXT_TT_DEV_IOTLB :
- CONTEXT_TT_MULTI_LEVEL;
+ if (info && info->ats_supported)
+ translation = CONTEXT_TT_DEV_IOTLB;
+ else
+ translation = CONTEXT_TT_MULTI_LEVEL;
context_set_address_root(context, virt_to_phys(pgd));
context_set_address_width(context, iommu->agaw);
info->bus = bus;
info->devfn = devfn;
- info->ats.enabled = 0;
- info->ats.qdep = 0;
+ info->ats_supported = info->pasid_supported = info->pri_supported = 0;
+ info->ats_enabled = info->pasid_enabled = info->pri_enabled = 0;
+ info->ats_qdep = 0;
info->dev = dev;
info->domain = domain;
info->iommu = iommu;
+ if (dev && dev_is_pci(dev)) {
+ struct pci_dev *pdev = to_pci_dev(info->dev);
+
+ if (ecap_dev_iotlb_support(iommu->ecap) &&
+ pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ATS) &&
+ dmar_find_matched_atsr_unit(pdev))
+ info->ats_supported = 1;
+
+ if (ecs_enabled(iommu)) {
+ if (pasid_enabled(iommu)) {
+ int features = pci_pasid_features(pdev);
+ if (features >= 0)
+ info->pasid_supported = features | 1;
+ }
+
+ if (info->ats_supported && ecap_prs(iommu->ecap) &&
+ pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI))
+ info->pri_supported = 1;
+ }
+ }
+
spin_lock_irqsave(&device_domain_lock, flags);
if (dev)
found = find_domain(dev);
return domain;
}
-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,
unsigned long long end)
DMA_PTE_READ|DMA_PTE_WRITE);
}
-static int iommu_prepare_identity_map(struct device *dev,
- unsigned long long start,
- unsigned long long end)
+static int domain_prepare_identity_map(struct device *dev,
+ struct dmar_domain *domain,
+ unsigned long long start,
+ unsigned long long end)
{
- struct dmar_domain *domain;
- int ret;
-
- domain = get_domain_for_dev(dev, 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
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;
+ return -EIO;
}
if (end >> 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;
+ return -EIO;
}
- ret = iommu_domain_identity_map(domain, start, end);
- if (ret)
- goto error;
+ return iommu_domain_identity_map(domain, start, end);
+}
- return 0;
+static int iommu_prepare_identity_map(struct device *dev,
+ unsigned long long start,
+ unsigned long long end)
+{
+ struct dmar_domain *domain;
+ int ret;
+
+ domain = get_domain_for_dev(dev, DEFAULT_DOMAIN_ADDRESS_WIDTH);
+ if (!domain)
+ return -ENOMEM;
+
+ ret = domain_prepare_identity_map(dev, domain, start, end);
+ if (ret)
+ domain_exit(domain);
- error:
- domain_exit(domain);
return ret;
}
}
static int copy_context_table(struct intel_iommu *iommu,
- struct root_entry __iomem *old_re,
+ struct root_entry *old_re,
struct context_entry **tbl,
int bus, bool ext)
{
int tbl_idx, pos = 0, idx, devfn, ret = 0, did;
- struct context_entry __iomem *old_ce = NULL;
struct context_entry *new_ce = NULL, ce;
+ struct context_entry *old_ce = NULL;
struct root_entry re;
phys_addr_t old_ce_phys;
tbl_idx = ext ? bus * 2 : bus;
- memcpy_fromio(&re, old_re, sizeof(re));
+ memcpy(&re, old_re, sizeof(re));
for (devfn = 0; devfn < 256; devfn++) {
/* First calculate the correct index */
}
ret = -ENOMEM;
- old_ce = ioremap_cache(old_ce_phys, PAGE_SIZE);
+ old_ce = memremap(old_ce_phys, PAGE_SIZE,
+ MEMREMAP_WB);
if (!old_ce)
goto out;
}
/* Now copy the context entry */
- memcpy_fromio(&ce, old_ce + idx, sizeof(ce));
+ memcpy(&ce, old_ce + idx, sizeof(ce));
if (!__context_present(&ce))
continue;
__iommu_flush_cache(iommu, new_ce, VTD_PAGE_SIZE);
out_unmap:
- iounmap(old_ce);
+ memunmap(old_ce);
out:
return ret;
static int copy_translation_tables(struct intel_iommu *iommu)
{
- struct root_entry __iomem *old_rt;
struct context_entry **ctxt_tbls;
+ struct root_entry *old_rt;
phys_addr_t old_rt_phys;
int ctxt_table_entries;
unsigned long flags;
if (!old_rt_phys)
return -EINVAL;
- old_rt = ioremap_cache(old_rt_phys, PAGE_SIZE);
+ old_rt = memremap(old_rt_phys, PAGE_SIZE, MEMREMAP_WB);
if (!old_rt)
return -ENOMEM;
ret = 0;
out_unmap:
- iounmap(old_rt);
+ memunmap(old_rt);
return ret;
}
if (!ecap_pass_through(iommu->ecap))
hw_pass_through = 0;
+#ifdef CONFIG_INTEL_IOMMU_SVM
+ if (pasid_enabled(iommu))
+ intel_svm_alloc_pasid_tables(iommu);
+#endif
}
if (iommu_pass_through)
iommu_flush_write_buffer(iommu);
+#ifdef CONFIG_INTEL_IOMMU_SVM
+ if (pasid_enabled(iommu) && ecap_prs(iommu->ecap)) {
+ ret = intel_svm_enable_prq(iommu);
+ if (ret)
+ goto free_iommu;
+ }
+#endif
ret = dmar_set_interrupt(iommu);
if (ret)
goto free_iommu;
static struct dmar_domain *__get_valid_domain_for_dev(struct device *dev)
{
+ struct dmar_rmrr_unit *rmrr;
struct dmar_domain *domain;
+ struct device *i_dev;
+ int i, ret;
domain = get_domain_for_dev(dev, DEFAULT_DOMAIN_ADDRESS_WIDTH);
if (!domain) {
return NULL;
}
+ /* We have a new domain - setup possible RMRRs for the device */
+ rcu_read_lock();
+ for_each_rmrr_units(rmrr) {
+ for_each_active_dev_scope(rmrr->devices, rmrr->devices_cnt,
+ i, i_dev) {
+ if (i_dev != dev)
+ continue;
+
+ ret = domain_prepare_identity_map(dev, domain,
+ rmrr->base_address,
+ rmrr->end_address);
+ if (ret)
+ dev_err(dev, "Mapping reserved region failed\n");
+ }
+ }
+ rcu_read_unlock();
+
return domain;
}
if (ret)
goto out;
+#ifdef CONFIG_INTEL_IOMMU_SVM
+ if (pasid_enabled(iommu))
+ intel_svm_alloc_pasid_tables(iommu);
+#endif
+
if (dmaru->ignored) {
/*
* we always have to disable PMRs or DMA may fail on this device
intel_iommu_init_qi(iommu);
iommu_flush_write_buffer(iommu);
+
+#ifdef CONFIG_INTEL_IOMMU_SVM
+ if (pasid_enabled(iommu) && ecap_prs(iommu->ecap)) {
+ ret = intel_svm_enable_prq(iommu);
+ if (ret)
+ goto disable_iommu;
+ }
+#endif
ret = dmar_set_interrupt(iommu);
if (ret)
goto disable_iommu;
dev = pci_physfn(dev);
for (bus = dev->bus; bus; bus = bus->parent) {
bridge = bus->self;
- if (!bridge || !pci_is_pcie(bridge) ||
+ /* If it's an integrated device, allow ATS */
+ if (!bridge)
+ return 1;
+ /* Connected via non-PCIe: no ATS */
+ if (!pci_is_pcie(bridge) ||
pci_pcie_type(bridge) == PCI_EXP_TYPE_PCI_BRIDGE)
return 0;
+ /* If we found the root port, look it up in the ATSR */
if (pci_pcie_type(bridge) == PCI_EXP_TYPE_ROOT_PORT)
break;
}
- if (!bridge)
- return 0;
rcu_read_lock();
list_for_each_entry_rcu(atsru, &dmar_atsr_units, list) {
iommu_device_unlink(iommu->iommu_dev, dev);
}
+#ifdef CONFIG_INTEL_IOMMU_SVM
+int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct intel_svm_dev *sdev)
+{
+ struct device_domain_info *info;
+ struct context_entry *context;
+ struct dmar_domain *domain;
+ unsigned long flags;
+ u64 ctx_lo;
+ int ret;
+
+ domain = get_valid_domain_for_dev(sdev->dev);
+ if (!domain)
+ return -EINVAL;
+
+ spin_lock_irqsave(&device_domain_lock, flags);
+ spin_lock(&iommu->lock);
+
+ ret = -EINVAL;
+ info = sdev->dev->archdata.iommu;
+ if (!info || !info->pasid_supported)
+ goto out;
+
+ context = iommu_context_addr(iommu, info->bus, info->devfn, 0);
+ if (WARN_ON(!context))
+ goto out;
+
+ ctx_lo = context[0].lo;
+
+ sdev->did = domain->iommu_did[iommu->seq_id];
+ sdev->sid = PCI_DEVID(info->bus, info->devfn);
+
+ if (!(ctx_lo & CONTEXT_PASIDE)) {
+ context[1].hi = (u64)virt_to_phys(iommu->pasid_state_table);
+ context[1].lo = (u64)virt_to_phys(iommu->pasid_table) | ecap_pss(iommu->ecap);
+ wmb();
+ /* CONTEXT_TT_MULTI_LEVEL and CONTEXT_TT_DEV_IOTLB are both
+ * extended to permit requests-with-PASID if the PASIDE bit
+ * is set. which makes sense. For CONTEXT_TT_PASS_THROUGH,
+ * however, the PASIDE bit is ignored and requests-with-PASID
+ * are unconditionally blocked. Which makes less sense.
+ * So convert from CONTEXT_TT_PASS_THROUGH to one of the new
+ * "guest mode" translation types depending on whether ATS
+ * is available or not. Annoyingly, we can't use the new
+ * modes *unless* PASIDE is set. */
+ if ((ctx_lo & CONTEXT_TT_MASK) == (CONTEXT_TT_PASS_THROUGH << 2)) {
+ ctx_lo &= ~CONTEXT_TT_MASK;
+ if (info->ats_supported)
+ ctx_lo |= CONTEXT_TT_PT_PASID_DEV_IOTLB << 2;
+ else
+ ctx_lo |= CONTEXT_TT_PT_PASID << 2;
+ }
+ ctx_lo |= CONTEXT_PASIDE;
+ if (iommu->pasid_state_table)
+ ctx_lo |= CONTEXT_DINVE;
+ if (info->pri_supported)
+ ctx_lo |= CONTEXT_PRS;
+ context[0].lo = ctx_lo;
+ wmb();
+ iommu->flush.flush_context(iommu, sdev->did, sdev->sid,
+ DMA_CCMD_MASK_NOBIT,
+ DMA_CCMD_DEVICE_INVL);
+ }
+
+ /* Enable PASID support in the device, if it wasn't already */
+ if (!info->pasid_enabled)
+ iommu_enable_dev_iotlb(info);
+
+ if (info->ats_enabled) {
+ sdev->dev_iotlb = 1;
+ sdev->qdep = info->ats_qdep;
+ if (sdev->qdep >= QI_DEV_EIOTLB_MAX_INVS)
+ sdev->qdep = 0;
+ }
+ ret = 0;
+
+ out:
+ spin_unlock(&iommu->lock);
+ spin_unlock_irqrestore(&device_domain_lock, flags);
+
+ return ret;
+}
+
+struct intel_iommu *intel_svm_device_to_iommu(struct device *dev)
+{
+ struct intel_iommu *iommu;
+ u8 bus, devfn;
+
+ if (iommu_dummy(dev)) {
+ dev_warn(dev,
+ "No IOMMU translation for device; cannot enable SVM\n");
+ return NULL;
+ }
+
+ iommu = device_to_iommu(dev, &bus, &devfn);
+ if ((!iommu)) {
+ dev_err(dev, "No IOMMU for device; cannot enable SVM\n");
+ return NULL;
+ }
+
+ if (!iommu->pasid_table) {
+ dev_err(dev, "PASID not enabled on IOMMU; cannot enable SVM\n");
+ return NULL;
+ }
+
+ return iommu;
+}
+#endif /* CONFIG_INTEL_IOMMU_SVM */
+
static const struct iommu_ops intel_iommu_ops = {
.capable = intel_iommu_capable,
.domain_alloc = intel_iommu_domain_alloc,
.iova_to_phys = intel_iommu_iova_to_phys,
.add_device = intel_iommu_add_device,
.remove_device = intel_iommu_remove_device,
+ .device_group = pci_device_group,
.pgsize_bitmap = INTEL_IOMMU_PGSIZES,
};
projects / karo-tx-linux.git / blobdiff