Messages in this thread Patch in this message |  | | From | Lu Baolu <> | Subject | [PATCH 2/3] iommu/vt-d: Drop stop marker messages | Date | Sat, 16 Apr 2022 20:30:48 +0800 |
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The VT-d driver explicitly drains the pending page requests when a CPU page table (represented by a mm struct) is unbound from a PASID according to the procedures defined in the VT-d spec. Hence, there's no need to report the stop-marker message in prq_event_thread(). The stop marker messages do not need a response. This drops stop marker messages silently if any of them is found in the page request queue.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Jacob Pan <jacob.jun.pan@linux.intel.com> --- drivers/iommu/intel/svm.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c index d88af37c20ef..d1c42dfae6ca 100644 --- a/drivers/iommu/intel/svm.c +++ b/drivers/iommu/intel/svm.c @@ -758,6 +758,10 @@ static irqreturn_t prq_event_thread(int irq, void *d) goto bad_req; } + /* Drop Stop Marker message. No need for a response. */ + if (unlikely(req->lpig && !req->rd_req && !req->wr_req)) + goto prq_advance; + if (!svm || svm->pasid != req->pasid) { /* * It can't go away, because the driver is not permitted -- 2.25.1
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