The patch titled
Subject: arm64/smmu: use TLBI ASID when invalidating entire range
has been added to the -mm mm-unstable branch. Its filename is
arm64-smmu-use-tlbi-asid-when-invalidating-entire-range.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/arm64-smmu-use-tlbi-asid-when-invalidating-entire-range.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Alistair Popple <apopple@xxxxxxxxxx>
Subject: arm64/smmu: use TLBI ASID when invalidating entire range
Date: Tue, 18 Jul 2023 17:56:16 +1000
The ARM SMMU has a specific command for invalidating the TLB for an entire
ASID. Currently this is used for the IO_PGTABLE API but not for ATS when
called from the MMU notifier.
The current implementation of notifiers does not attempt to invalidate
such a large address range, instead walking each VMA and invalidating each
range individually during mmap removal. However in future SMMU TLB
invalidations are going to be sent as part of the normal flush_tlb_*()
kernel calls. To better deal with that add handling to use TLBI ASID when
invalidating the entire address space.
Link: https://lkml.kernel.org/r/b29f31c8cbdb2b7d90443eae522a88218eb639ee.1689666760.git-series.apopple@xxxxxxxxxx
Signed-off-by: Alistair Popple <apopple@xxxxxxxxxx>
Cc: Andrew Donnellan <ajd@xxxxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Frederic Barrat <fbarrat@xxxxxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Kevin Tian <kevin.tian@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Nicolin Chen <nicolinc@xxxxxxxxxx>
Cc: Robin Murphy <robin.murphy@xxxxxxx>
Cc: Sean Christopherson <seanjc@xxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Zhi Wang <zhi.wang.linux@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 16 +++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c~arm64-smmu-use-tlbi-asid-when-invalidating-entire-range
+++ a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
@@ -201,10 +201,20 @@ static void arm_smmu_mm_arch_invalidate_
* range. So do a simple translation here by calculating size correctly.
*/
size = end - start;
+ if (size == ULONG_MAX)
+ size = 0;
+
+ if (!(smmu_domain->smmu->features & ARM_SMMU_FEAT_BTM)) {
+ if (!size)
+ arm_smmu_tlb_inv_asid(smmu_domain->smmu,
+ smmu_mn->cd->asid);
+ else
+ arm_smmu_tlb_inv_range_asid(start, size,
+ smmu_mn->cd->asid,
+ PAGE_SIZE, false,
+ smmu_domain);
+ }
- if (!(smmu_domain->smmu->features & ARM_SMMU_FEAT_BTM))
- arm_smmu_tlb_inv_range_asid(start, size, smmu_mn->cd->asid,
- PAGE_SIZE, false, smmu_domain);
arm_smmu_atc_inv_domain(smmu_domain, mm->pasid, start, size);
}
_
Patches currently in -mm which might be from apopple@xxxxxxxxxx are
mm_notifiers-rename-invalidate_range-notifier.patch
arm64-smmu-use-tlbi-asid-when-invalidating-entire-range.patch
mmu_notifiers-call-arch_invalidate_secondary_tlbs-when-invalidating-tlbs.patch
mmu_notifiers-dont-invalidate-secondary-tlbs-as-part-of-mmu_notifier_invalidate_range_end.patch
