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iommu/vt-d: Report prq to io-pgfault framework

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Let the IO page fault requests get handled through the io-pgfault
framework.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20210520031531.712333-1-baolu.lu@linux.intel.com
Link: https://lore.kernel.org/r/20210610020115.1637656-12-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2021-06-10 10:01:03 +08:00 committed by Joerg Roedel
parent 4c82b88696
commit d5b9e4bfe0
2 changed files with 17 additions and 81 deletions
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14
drivers/iommu/intel/iommu.c
View File

@ -5343,6 +5343,7 @@ static int intel_iommu_enable_sva(struct device *dev)
{
struct device_domain_info *info = get_domain_info(dev);
struct intel_iommu *iommu = info->iommu;
int ret;
if (!info || !iommu || dmar_disabled)
return -EINVAL;
@ -5356,15 +5357,24 @@ static int intel_iommu_enable_sva(struct device *dev)
if (!info->pasid_enabled || !info->pri_enabled || !info->ats_enabled)
return -EINVAL;
return iopf_queue_add_device(iommu->iopf_queue, dev);
ret = iopf_queue_add_device(iommu->iopf_queue, dev);
if (!ret)
ret = iommu_register_device_fault_handler(dev, iommu_queue_iopf, dev);
return ret;
}
static int intel_iommu_disable_sva(struct device *dev)
{
struct device_domain_info *info = get_domain_info(dev);
struct intel_iommu *iommu = info->iommu;
int ret;
return iopf_queue_remove_device(iommu->iopf_queue, dev);
ret = iommu_unregister_device_fault_handler(dev);
if (!ret)
ret = iopf_queue_remove_device(iommu->iopf_queue, dev);
return ret;
}
/*

84
drivers/iommu/intel/svm.c
View File

@ -724,22 +724,6 @@ struct page_req_dsc {
#define PRQ_RING_MASK ((0x1000 << PRQ_ORDER) - 0x20)
static bool access_error(struct vm_area_struct *vma, struct page_req_dsc *req)
{
unsigned long requested = 0;
if (req->exe_req)
requested |= VM_EXEC;
if (req->rd_req)
requested |= VM_READ;
if (req->wr_req)
requested |= VM_WRITE;
return (requested & ~vma->vm_flags) != 0;
}
static bool is_canonical_address(u64 addr)
{
int shift = 64 - (__VIRTUAL_MASK_SHIFT + 1);
@ -809,6 +793,8 @@ prq_retry:
goto prq_retry;
}
iopf_queue_flush_dev(dev);
/*
* Perform steps described in VT-d spec CH7.10 to drain page
* requests and responses in hardware.
@ -924,61 +910,6 @@ static void handle_bad_prq_event(struct intel_iommu *iommu,
qi_submit_sync(iommu, &desc, 1, 0);
}
static void handle_single_prq_event(struct intel_iommu *iommu,
struct mm_struct *mm,
struct page_req_dsc *req)
{
u64 address = (u64)req->addr << VTD_PAGE_SHIFT;
int result = QI_RESP_INVALID;
struct vm_area_struct *vma;
struct qi_desc desc;
unsigned int flags;
vm_fault_t ret;
/* If the mm is already defunct, don't handle faults. */
if (!mmget_not_zero(mm))
goto response;
mmap_read_lock(mm);
vma = find_extend_vma(mm, address);
if (!vma || address < vma->vm_start)
goto invalid;
if (access_error(vma, req))
goto invalid;
flags = FAULT_FLAG_USER | FAULT_FLAG_REMOTE;
if (req->wr_req)
flags |= FAULT_FLAG_WRITE;
ret = handle_mm_fault(vma, address, flags, NULL);
if (!(ret & VM_FAULT_ERROR))
result = QI_RESP_SUCCESS;
invalid:
mmap_read_unlock(mm);
mmput(mm);
response:
if (!(req->lpig || req->priv_data_present))
return;
desc.qw0 = QI_PGRP_PASID(req->pasid) |
QI_PGRP_DID(req->rid) |
QI_PGRP_PASID_P(req->pasid_present) |
QI_PGRP_PDP(req->priv_data_present) |
QI_PGRP_RESP_CODE(result) |
QI_PGRP_RESP_TYPE;
desc.qw1 = QI_PGRP_IDX(req->prg_index) |
QI_PGRP_LPIG(req->lpig);
desc.qw2 = 0;
desc.qw3 = 0;
if (req->priv_data_present)
memcpy(&desc.qw2, req->priv_data, sizeof(req->priv_data));
qi_submit_sync(iommu, &desc, 1, 0);
}
static irqreturn_t prq_event_thread(int irq, void *d)
{
struct intel_svm_dev *sdev = NULL;
@ -1049,14 +980,8 @@ bad_req:
* If prq is to be handled outside iommu driver via receiver of
* the fault notifiers, we skip the page response here.
*/
if (svm->flags & SVM_FLAG_GUEST_MODE) {
if (!intel_svm_prq_report(sdev->dev, req))
goto prq_advance;
else
goto bad_req;
}
handle_single_prq_event(iommu, svm->mm, req);
if (intel_svm_prq_report(sdev->dev, req))
handle_bad_prq_event(iommu, req, QI_RESP_INVALID);
prq_advance:
head = (head + sizeof(*req)) & PRQ_RING_MASK;
}
@ -1073,6 +998,7 @@ prq_advance:
head = dmar_readq(iommu->reg + DMAR_PQH_REG) & PRQ_RING_MASK;
tail = dmar_readq(iommu->reg + DMAR_PQT_REG) & PRQ_RING_MASK;
if (head == tail) {
iopf_queue_discard_partial(iommu->iopf_queue);
writel(DMA_PRS_PRO, iommu->reg + DMAR_PRS_REG);
pr_info_ratelimited("IOMMU: %s: PRQ overflow cleared",
iommu->name);