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iommu/arm-smmu-v3: Hook up ATC invalidation to mm ops

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The invalidate_range() notifier is called for any change to the address
space. Perform the required ATC invalidations.

Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Link: https://lore.kernel.org/r/20201106155048.997886-5-jean-philippe@linaro.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Jean-Philippe Brucker 2020-11-06 16:50:50 +01:00 committed by Will Deacon
parent 32784a9562
commit 2f7e8c553e
3 changed files with 33 additions and 3 deletions
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16
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
View file

@ -177,6 +177,16 @@ static void arm_smmu_free_shared_cd(struct arm_smmu_ctx_desc *cd)
}
}
static void arm_smmu_mm_invalidate_range(struct mmu_notifier *mn,
struct mm_struct *mm,
unsigned long start, unsigned long end)
{
struct arm_smmu_mmu_notifier *smmu_mn = mn_to_smmu(mn);
arm_smmu_atc_inv_domain(smmu_mn->domain, mm->pasid, start,
end - start + 1);
}
static void arm_smmu_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
{
struct arm_smmu_mmu_notifier *smmu_mn = mn_to_smmu(mn);
@ -195,6 +205,7 @@ static void arm_smmu_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
arm_smmu_write_ctx_desc(smmu_domain, mm->pasid, &quiet_cd);
arm_smmu_tlb_inv_asid(smmu_domain->smmu, smmu_mn->cd->asid);
arm_smmu_atc_inv_domain(smmu_domain, mm->pasid, 0, 0);
smmu_mn->cleared = true;
mutex_unlock(&sva_lock);
@ -206,6 +217,7 @@ static void arm_smmu_mmu_notifier_free(struct mmu_notifier *mn)
}
static struct mmu_notifier_ops arm_smmu_mmu_notifier_ops = {
.invalidate_range = arm_smmu_mm_invalidate_range,
.release = arm_smmu_mm_release,
.free_notifier = arm_smmu_mmu_notifier_free,
};
@ -278,8 +290,10 @@ static void arm_smmu_mmu_notifier_put(struct arm_smmu_mmu_notifier *smmu_mn)
* If we went through clear(), we've already invalidated, and no
* new TLB entry can have been formed.
*/
if (!smmu_mn->cleared)
if (!smmu_mn->cleared) {
arm_smmu_tlb_inv_asid(smmu_domain->smmu, cd->asid);
arm_smmu_atc_inv_domain(smmu_domain, mm->pasid, 0, 0);
}
/* Frees smmu_mn */
mmu_notifier_put(&smmu_mn->mn);

18
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
View file

@ -1524,6 +1524,20 @@ arm_smmu_atc_inv_to_cmd(int ssid, unsigned long iova, size_t size,
size_t inval_grain_shift = 12;
unsigned long page_start, page_end;
/*
* ATS and PASID:
*
* If substream_valid is clear, the PCIe TLP is sent without a PASID
* prefix. In that case all ATC entries within the address range are
* invalidated, including those that were requested with a PASID! There
* is no way to invalidate only entries without PASID.
*
* When using STRTAB_STE_1_S1DSS_SSID0 (reserving CD 0 for non-PASID
* traffic), translation requests without PASID create ATC entries
* without PASID, which must be invalidated with substream_valid clear.
* This has the unpleasant side-effect of invalidating all PASID-tagged
* ATC entries within the address range.
*/
*cmd = (struct arm_smmu_cmdq_ent) {
.opcode = CMDQ_OP_ATC_INV,
.substream_valid = !!ssid,
@ -1582,8 +1596,8 @@ static int arm_smmu_atc_inv_master(struct arm_smmu_master *master)
return arm_smmu_cmdq_issue_sync(master->smmu);
}
static int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain,
int ssid, unsigned long iova, size_t size)
int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain, int ssid,
unsigned long iova, size_t size)
{
int i;
unsigned long flags;

2
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
View file

@ -695,6 +695,8 @@ int arm_smmu_write_ctx_desc(struct arm_smmu_domain *smmu_domain, int ssid,
struct arm_smmu_ctx_desc *cd);
void arm_smmu_tlb_inv_asid(struct arm_smmu_device *smmu, u16 asid);
bool arm_smmu_free_asid(struct arm_smmu_ctx_desc *cd);
int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain, int ssid,
unsigned long iova, size_t size);
#ifdef CONFIG_ARM_SMMU_V3_SVA
bool arm_smmu_sva_supported(struct arm_smmu_device *smmu);