[RFCv2 PATCH 25/36] iommu/arm-smmu-v3: Use shared ASID set
From: Jean-Philippe Brucker <hidden>
Date: 2017-10-06 13:31:52
Also in:
linux-acpi, linux-arm-kernel, linux-iommu, linux-pci
Subsystem:
iommu subsystem, the rest · Maintainers:
Joerg Roedel, Will Deacon, Linus Torvalds
We now have two exclusive sets of ASIDs: private and shared. SMMUv3 allows for contexts to take part in distributed TLB maintenance via the ASET bit. When this bit is 0 for a given context, TLB entries tagged with its ASID are invalidated by broadcast TLB maintenance. Set ASET=0 for process contexts. Signed-off-by: Jean-Philippe Brucker <redacted> --- drivers/iommu/arm-smmu-v3.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index e89e6d1263d9..b7355630526a 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c@@ -1240,7 +1240,8 @@ static void arm_smmu_write_ctx_desc(struct arm_smmu_domain *smmu_domain, CTXDESC_CD_0_ENDI | #endif CTXDESC_CD_0_R | CTXDESC_CD_0_A | - CTXDESC_CD_0_ASET_PRIVATE | + (ssid ? CTXDESC_CD_0_ASET_SHARED : + CTXDESC_CD_0_ASET_PRIVATE) | CTXDESC_CD_0_AA64 | (u64)cd->asid << CTXDESC_CD_0_ASID_SHIFT | CTXDESC_CD_0_V;
--
2.13.3