From: Yanfei Xu Date: Wed, 9 Aug 2023 12:48:04 +0000 (+0800) Subject: iommu/vt-d: Fix to flush cache of PASID directory table X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a793bbfd1a175b6301cf9db0668cbc3f8c82b13c;p=linux iommu/vt-d: Fix to flush cache of PASID directory table [ Upstream commit 8a3b8e63f8371c1247b7aa24ff9c5312f1a6948b ] Even the PCI devices don't support pasid capability, PASID table is mandatory for a PCI device in scalable mode. However flushing cache of pasid directory table for these devices are not taken after pasid table is allocated as the "size" of table is zero. Fix it by calculating the size by page order. Found this when reading the code, no real problem encountered for now. Fixes: 194b3348bdbb ("iommu/vt-d: Fix PASID directory pointer coherency") Suggested-by: Lu Baolu Signed-off-by: Yanfei Xu Link: https://lore.kernel.org/r/20230616081045.721873-1-yanfei.xu@intel.com Signed-off-by: Lu Baolu Signed-off-by: Joerg Roedel Signed-off-by: Sasha Levin --- diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c index c5d479770e12..49fc5a038a14 100644 --- a/drivers/iommu/intel/pasid.c +++ b/drivers/iommu/intel/pasid.c @@ -129,7 +129,7 @@ int intel_pasid_alloc_table(struct device *dev) info->pasid_table = pasid_table; if (!ecap_coherent(info->iommu->ecap)) - clflush_cache_range(pasid_table->table, size); + clflush_cache_range(pasid_table->table, (1 << order) * PAGE_SIZE); return 0; }