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Merge git://git.infradead.org/intel-iommu 

Pull IOMMU fixes from David Woodhouse:
 "Two minor fixes.

  The first fixes the assignment of SR-IOV virtual functions to the
  correct IOMMU unit, and the second fixes the excessively large (and
  physically contiguous) PASID tables used with SVM"

* git://git.infradead.org/intel-iommu:
  iommu/vt-d: Fix PASID table allocation
  iommu/vt-d: Fix IOMMU lookup for SR-IOV Virtual Functions
hifive-unleashed-5.1
Linus Torvalds 2016-11-27 08:24:46 -08:00
parent ff17bf8a0d 9101704429
commit 105ecadc6d
4 changed files with 33 additions and 11 deletions
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4
drivers/iommu/dmar.c
View File

@ -338,7 +338,9 @@ static int dmar_pci_bus_notifier(struct notifier_block *nb,
struct pci_dev *pdev = to_pci_dev(data);
struct dmar_pci_notify_info *info;
/* Only care about add/remove events for physical functions */
/* Only care about add/remove events for physical functions.
* For VFs we actually do the lookup based on the corresponding
* PF in device_to_iommu() anyway. */
if (pdev->is_virtfn)
return NOTIFY_DONE;
if (action != BUS_NOTIFY_ADD_DEVICE &&

13
drivers/iommu/intel-iommu.c
View File

@ -892,7 +892,13 @@ static struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devf
return NULL;
if (dev_is_pci(dev)) {
struct pci_dev *pf_pdev;
pdev = to_pci_dev(dev);
/* VFs aren't listed in scope tables; we need to look up
* the PF instead to find the IOMMU. */
pf_pdev = pci_physfn(pdev);
dev = &pf_pdev->dev;
segment = pci_domain_nr(pdev->bus);
} else if (has_acpi_companion(dev))
dev = &ACPI_COMPANION(dev)->dev;
@ -905,6 +911,13 @@ static struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devf
for_each_active_dev_scope(drhd->devices,
drhd->devices_cnt, i, tmp) {
if (tmp == dev) {
/* For a VF use its original BDF# not that of the PF
* which we used for the IOMMU lookup. Strictly speaking
* we could do this for all PCI devices; we only need to
* get the BDF# from the scope table for ACPI matches. */
if (pdev->is_virtfn)
goto got_pdev;
*bus = drhd->devices[i].bus;
*devfn = drhd->devices[i].devfn;
goto out;

26
drivers/iommu/intel-svm.c
View File

@ -39,10 +39,18 @@ int intel_svm_alloc_pasid_tables(struct intel_iommu *iommu)
struct page *pages;
int order;
order = ecap_pss(iommu->ecap) + 7 - PAGE_SHIFT;
if (order < 0)
order = 0;
/* Start at 2 because it's defined as 2^(1+PSS) */
iommu->pasid_max = 2 << ecap_pss(iommu->ecap);
/* Eventually I'm promised we will get a multi-level PASID table
* and it won't have to be physically contiguous. Until then,
* limit the size because 8MiB contiguous allocations can be hard
* to come by. The limit of 0x20000, which is 1MiB for each of
* the PASID and PASID-state tables, is somewhat arbitrary. */
if (iommu->pasid_max > 0x20000)
iommu->pasid_max = 0x20000;
order = get_order(sizeof(struct pasid_entry) * iommu->pasid_max);
pages = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
if (!pages) {
pr_warn("IOMMU: %s: Failed to allocate PASID table\n",
@ -53,6 +61,8 @@ int intel_svm_alloc_pasid_tables(struct intel_iommu *iommu)
pr_info("%s: Allocated order %d PASID table.\n", iommu->name, order);
if (ecap_dis(iommu->ecap)) {
/* Just making it explicit... */
BUILD_BUG_ON(sizeof(struct pasid_entry) != sizeof(struct pasid_state_entry));
pages = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
if (pages)
iommu->pasid_state_table = page_address(pages);
@ -68,11 +78,7 @@ int intel_svm_alloc_pasid_tables(struct intel_iommu *iommu)
int intel_svm_free_pasid_tables(struct intel_iommu *iommu)
{
int order;
order = ecap_pss(iommu->ecap) + 7 - PAGE_SHIFT;
if (order < 0)
order = 0;
int order = get_order(sizeof(struct pasid_entry) * iommu->pasid_max);
if (iommu->pasid_table) {
free_pages((unsigned long)iommu->pasid_table, order);
@ -371,8 +377,8 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
}
svm->iommu = iommu;
if (pasid_max > 2 << ecap_pss(iommu->ecap))
pasid_max = 2 << ecap_pss(iommu->ecap);
if (pasid_max > iommu->pasid_max)
pasid_max = iommu->pasid_max;
/* Do not use PASID 0 in caching mode (virtualised IOMMU) */
ret = idr_alloc(&iommu->pasid_idr, svm,

1
include/linux/intel-iommu.h
View File

@ -429,6 +429,7 @@ struct intel_iommu {
struct page_req_dsc *prq;
unsigned char prq_name[16]; /* Name for PRQ interrupt */
struct idr pasid_idr;
u32 pasid_max;
#endif
struct q_inval *qi; /* Queued invalidation info */
u32 *iommu_state; /* Store iommu states between suspend and resume.*/