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iommu/vt-d: Fix dev iotlb pfsid use

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commit 1c48db44924298ad0cb5a6386b88017539be8822 upstream.

PFSID should be used in the invalidation descriptor for flushing
device IOTLBs on SRIOV VFs.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: stable@vger.kernel.org
Cc: "Ashok Raj" <ashok.raj@intel.com>
Cc: "Lu Baolu" <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jacob Pan 2018-06-07 09:57:00 -07:00 • committed by Greg Kroah-Hartman
parent d25b6212cc
commit d792799caa
3 changed files with 21 additions and 7 deletions
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6
drivers/iommu/dmar.c
View file

@ -1315,8 +1315,8 @@ void qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr,
qi_submit_sync(&desc, iommu);
}
void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 qdep,
u64 addr, unsigned mask)
void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid,
u16 qdep, u64 addr, unsigned mask)
{
struct qi_desc desc;
@ -1331,7 +1331,7 @@ void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 qdep,
qdep = 0;
desc.low = QI_DEV_IOTLB_SID(sid) | QI_DEV_IOTLB_QDEP(qdep) |
QI_DIOTLB_TYPE;
QI_DIOTLB_TYPE | QI_DEV_IOTLB_PFSID(pfsid);
qi_submit_sync(&desc, iommu);
}

17
drivers/iommu/intel-iommu.c
View file

@ -1480,6 +1480,20 @@ static void iommu_enable_dev_iotlb(struct device_domain_info *info)
return;
pdev = to_pci_dev(info->dev);
/* For IOMMU that supports device IOTLB throttling (DIT), we assign
* PFSID to the invalidation desc of a VF such that IOMMU HW can gauge
* queue depth at PF level. If DIT is not set, PFSID will be treated as
* reserved, which should be set to 0.
*/
if (!ecap_dit(info->iommu->ecap))
info->pfsid = 0;
else {
struct pci_dev *pf_pdev;
/* pdev will be returned if device is not a vf */
pf_pdev = pci_physfn(pdev);
info->pfsid = PCI_DEVID(pf_pdev->bus->number, pf_pdev->devfn);
}
#ifdef CONFIG_INTEL_IOMMU_SVM
/* The PCIe spec, in its wisdom, declares that the behaviour of
@ -1538,7 +1552,8 @@ static void iommu_flush_dev_iotlb(struct dmar_domain *domain,
sid = info->bus << 8 | info->devfn;
qdep = info->ats_qdep;
qi_flush_dev_iotlb(info->iommu, sid, qdep, addr, mask);
qi_flush_dev_iotlb(info->iommu, sid, info->pfsid,
qdep, addr, mask);
}
spin_unlock_irqrestore(&device_domain_lock, flags);
}

5
include/linux/intel-iommu.h
View file

@ -466,9 +466,8 @@ extern void qi_flush_context(struct intel_iommu *iommu, u16 did, u16 sid,
u8 fm, u64 type);
extern void qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr,
unsigned int size_order, u64 type);
extern void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 qdep,
u64 addr, unsigned mask);
extern void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid,
u16 qdep, u64 addr, unsigned mask);
extern int qi_submit_sync(struct qi_desc *desc, struct intel_iommu *iommu);
extern int dmar_ir_support(void);