Lu Baolu 1e5ac057b0 iommu/vt-d: Clear PRQ overflow only when PRQ is empty ... [ Upstream commit 28a77185f1 ] It is incorrect to always clear PRO when it's set w/o first checking whether the overflow condition has been cleared. Current code assumes that if an overflow condition occurs it must have been cleared by earlier loop. However since the code runs in a threaded context, the overflow condition could occur even after setting the head to the tail under some extreme condition. To be sane, we should read both head/tail again when seeing a pending PRO and only clear PRO after all pending PRs have been handled. Suggested-by: Kevin Tian <kevin.tian@intel.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Link: https://lore.kernel.org/linux-iommu/MWHPR11MB18862D2EA5BD432BF22D99A48CA09@MWHPR11MB1886.namprd11.prod.outlook.com/ Link: https://lore.kernel.org/r/20210126080730.2232859-2-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-03-17 17:06:23 +01:00
..
debugfs.c	iommu/vt-d: Rename intel-pasid.h to pasid.h	2020-07-24 10:51:21 +02:00
dmar.c	iommu/vt-d: Correctly check addr alignment in qi_flush_dev_iotlb_pasid()	2021-02-03 23:28:50 +01:00
iommu.c	iommu/vt-d: Do not use flush-queue when caching-mode is on	2021-02-07 15:37:13 +01:00
irq_remapping.c	iommu/intel: Fix memleak in intel_irq_remapping_alloc	2021-01-17 14:17:03 +01:00
Kconfig	IOMMU Updates for Linux v5.9	2020-08-11 14:13:24 -07:00
Makefile	iommu/vt-d: Move Kconfig and Makefile bits down into intel directory	2020-07-29 14:14:55 +02:00
pasid.c	drm, iommu: Change type of pasid to u32	2020-09-17 19:21:16 +02:00
pasid.h	iommu/vt-d: Fix status code for Allocate/Free PASID command	2021-03-09 11:11:15 +01:00
svm.c	iommu/vt-d: Clear PRQ overflow only when PRQ is empty	2021-03-17 17:06:23 +01:00
trace.c