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iommu/arm-smmu-v3: Hook up ATC invalidation to mm ops
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>
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32784a9562
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2f7e8c553e
3 changed files with 33 additions and 3 deletions
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@ -177,6 +177,16 @@ static void arm_smmu_free_shared_cd(struct arm_smmu_ctx_desc *cd)
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}
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}
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static void arm_smmu_mm_invalidate_range(struct mmu_notifier *mn,
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struct mm_struct *mm,
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unsigned long start, unsigned long end)
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{
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struct arm_smmu_mmu_notifier *smmu_mn = mn_to_smmu(mn);
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arm_smmu_atc_inv_domain(smmu_mn->domain, mm->pasid, start,
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end - start + 1);
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}
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static void arm_smmu_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
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{
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struct arm_smmu_mmu_notifier *smmu_mn = mn_to_smmu(mn);
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@ -195,6 +205,7 @@ static void arm_smmu_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
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arm_smmu_write_ctx_desc(smmu_domain, mm->pasid, &quiet_cd);
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arm_smmu_tlb_inv_asid(smmu_domain->smmu, smmu_mn->cd->asid);
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arm_smmu_atc_inv_domain(smmu_domain, mm->pasid, 0, 0);
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smmu_mn->cleared = true;
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mutex_unlock(&sva_lock);
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@ -206,6 +217,7 @@ static void arm_smmu_mmu_notifier_free(struct mmu_notifier *mn)
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}
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static struct mmu_notifier_ops arm_smmu_mmu_notifier_ops = {
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.invalidate_range = arm_smmu_mm_invalidate_range,
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.release = arm_smmu_mm_release,
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.free_notifier = arm_smmu_mmu_notifier_free,
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};
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@ -278,8 +290,10 @@ static void arm_smmu_mmu_notifier_put(struct arm_smmu_mmu_notifier *smmu_mn)
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* If we went through clear(), we've already invalidated, and no
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* new TLB entry can have been formed.
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*/
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if (!smmu_mn->cleared)
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if (!smmu_mn->cleared) {
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arm_smmu_tlb_inv_asid(smmu_domain->smmu, cd->asid);
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arm_smmu_atc_inv_domain(smmu_domain, mm->pasid, 0, 0);
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}
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/* Frees smmu_mn */
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mmu_notifier_put(&smmu_mn->mn);
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@ -1524,6 +1524,20 @@ arm_smmu_atc_inv_to_cmd(int ssid, unsigned long iova, size_t size,
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size_t inval_grain_shift = 12;
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unsigned long page_start, page_end;
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/*
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* ATS and PASID:
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*
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* If substream_valid is clear, the PCIe TLP is sent without a PASID
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* prefix. In that case all ATC entries within the address range are
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* invalidated, including those that were requested with a PASID! There
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* is no way to invalidate only entries without PASID.
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*
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* When using STRTAB_STE_1_S1DSS_SSID0 (reserving CD 0 for non-PASID
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* traffic), translation requests without PASID create ATC entries
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* without PASID, which must be invalidated with substream_valid clear.
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* This has the unpleasant side-effect of invalidating all PASID-tagged
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* ATC entries within the address range.
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*/
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*cmd = (struct arm_smmu_cmdq_ent) {
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.opcode = CMDQ_OP_ATC_INV,
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.substream_valid = !!ssid,
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@ -1582,8 +1596,8 @@ static int arm_smmu_atc_inv_master(struct arm_smmu_master *master)
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return arm_smmu_cmdq_issue_sync(master->smmu);
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}
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static int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain,
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int ssid, unsigned long iova, size_t size)
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int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain, int ssid,
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unsigned long iova, size_t size)
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{
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int i;
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unsigned long flags;
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@ -695,6 +695,8 @@ int arm_smmu_write_ctx_desc(struct arm_smmu_domain *smmu_domain, int ssid,
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struct arm_smmu_ctx_desc *cd);
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void arm_smmu_tlb_inv_asid(struct arm_smmu_device *smmu, u16 asid);
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bool arm_smmu_free_asid(struct arm_smmu_ctx_desc *cd);
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int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain, int ssid,
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unsigned long iova, size_t size);
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#ifdef CONFIG_ARM_SMMU_V3_SVA
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bool arm_smmu_sva_supported(struct arm_smmu_device *smmu);
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