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Thu, 30 Apr 2020 07:40:40 -0700 (PDT) Received: from localhost.localdomain ([2001:171b:226e:c200:c43b:ef78:d083:b355]) by smtp.gmail.com with ESMTPSA id n2sm4153286wrt.33.2020.04.30.07.40.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Apr 2020 07:40:39 -0700 (PDT) From: Jean-Philippe Brucker To: iommu@lists.linux-foundation.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, linux-mm@kvack.org Cc: joro@8bytes.org, catalin.marinas@arm.com, will@kernel.org, robin.murphy@arm.com, kevin.tian@intel.com, baolu.lu@linux.intel.com, Jonathan.Cameron@huawei.com, jacob.jun.pan@linux.intel.com, christian.koenig@amd.com, felix.kuehling@amd.com, zhangfei.gao@linaro.org, jgg@ziepe.ca, xuzaibo@huawei.com, fenghua.yu@intel.com, hch@infradead.org, Jean-Philippe Brucker Subject: [PATCH v6 18/25] iommu/arm-smmu-v3: Hook up ATC invalidation to mm ops Date: Thu, 30 Apr 2020 16:34:17 +0200 Message-Id: <20200430143424.2787566-19-jean-philippe@linaro.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200430143424.2787566-1-jean-philippe@linaro.org> References: <20200430143424.2787566-1-jean-philippe@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The invalidate_range() notifier is called for any change to the address space. Perform the required ATC invalidations. Signed-off-by: Jean-Philippe Brucker --- drivers/iommu/arm-smmu-v3.c | 56 ++++++++++++++++++++++++++++++------- 1 file changed, 46 insertions(+), 10 deletions(-) diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index 00e5b69bb81a5..c65937d953b5f 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -742,7 +742,7 @@ struct arm_smmu_mmu_notifier { struct arm_smmu_ctx_desc *cd; bool cleared; refcount_t refs; - struct arm_smmu_domain *domain; + struct arm_smmu_domain __rcu *domain; }; =20 #define mn_to_smmu(mn) container_of(mn, struct arm_smmu_mmu_notifier, mn= ) @@ -2396,6 +2396,20 @@ arm_smmu_atc_inv_to_cmd(int ssid, unsigned long io= va, size_t size, size_t inval_grain_shift =3D 12; unsigned long page_start, page_end; =20 + /* + * 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 =3D (struct arm_smmu_cmdq_ent) { .opcode =3D CMDQ_OP_ATC_INV, .substream_valid =3D !!ssid, @@ -2439,12 +2453,12 @@ arm_smmu_atc_inv_to_cmd(int ssid, unsigned long i= ova, size_t size, cmd->atc.size =3D log2_span; } =20 -static int arm_smmu_atc_inv_master(struct arm_smmu_master *master) +static int arm_smmu_atc_inv_master(struct arm_smmu_master *master, int s= sid) { int i; struct arm_smmu_cmdq_ent cmd; =20 - arm_smmu_atc_inv_to_cmd(0, 0, 0, &cmd); + arm_smmu_atc_inv_to_cmd(ssid, 0, 0, &cmd); =20 for (i =3D 0; i < master->num_sids; i++) { cmd.atc.sid =3D master->sids[i]; @@ -2958,7 +2972,7 @@ static void arm_smmu_disable_ats(struct arm_smmu_ma= ster *master) * ATC invalidation via the SMMU. */ wmb(); - arm_smmu_atc_inv_master(master); + arm_smmu_atc_inv_master(master, 0); atomic_dec(&smmu_domain->nr_ats_masters); } =20 @@ -3187,7 +3201,22 @@ static void arm_smmu_mm_invalidate_range(struct mm= u_notifier *mn, struct mm_struct *mm, unsigned long start, unsigned long end) { - /* TODO: invalidate ATS */ + struct arm_smmu_mmu_notifier *smmu_mn =3D mn_to_smmu(mn); + struct arm_smmu_domain *smmu_domain; + + rcu_read_lock(); + smmu_domain =3D rcu_dereference(smmu_mn->domain); + if (smmu_domain) { + /* + * Ensure that mm->pasid is valid. Pairs with the + * smp_store_release() from rcu_assign_pointer() in + * __arm_smmu_sva_bind() + */ + smp_rmb(); + arm_smmu_atc_inv_domain(smmu_domain, mm->pasid, start, + end - start + 1); + } + rcu_read_unlock(); } =20 static void arm_smmu_mm_release(struct mmu_notifier *mn, struct mm_struc= t *mm) @@ -3201,7 +3230,8 @@ static void arm_smmu_mm_release(struct mmu_notifier= *mn, struct mm_struct *mm) return; } =20 - smmu_domain =3D smmu_mn->domain; + smmu_domain =3D rcu_dereference_protected(smmu_mn->domain, + lockdep_is_held(&arm_smmu_sva_lock)); =20 /* * DMA may still be running. Keep the cd valid but disable @@ -3210,7 +3240,7 @@ static void arm_smmu_mm_release(struct mmu_notifier= *mn, struct mm_struct *mm) arm_smmu_write_ctx_desc(smmu_domain, mm->pasid, &invalid_cd); =20 arm_smmu_tlb_inv_asid(smmu_domain->smmu, smmu_mn->cd->asid); - /* TODO: invalidate ATS */ + arm_smmu_atc_inv_domain(smmu_domain, mm->pasid, 0, 0); =20 smmu_mn->cleared =3D true; mutex_unlock(&arm_smmu_sva_lock); @@ -3251,7 +3281,8 @@ __arm_smmu_sva_bind(struct device *dev, struct mm_s= truct *mm) return ERR_CAST(mn); =20 smmu_mn =3D mn_to_smmu(mn); - if (smmu_mn->domain) + if (rcu_dereference_protected(smmu_mn->domain, + lockdep_is_held(&arm_smmu_sva_lock))) refcount_inc(&smmu_mn->refs); =20 bond =3D kzalloc(sizeof(*bond), GFP_KERNEL); @@ -3277,7 +3308,11 @@ __arm_smmu_sva_bind(struct device *dev, struct mm_= struct *mm) =20 bond->sva.dev =3D dev; list_add(&bond->list, &master->bonds); - smmu_mn->domain =3D smmu_domain; + /* + * Initialize domain last, since the invalidate() notifier assumes a + * valid mm->pasid after fetching a valid domain. + */ + rcu_assign_pointer(smmu_mn->domain, smmu_domain); return &bond->sva; =20 err_free_pasid: @@ -3318,7 +3353,8 @@ static void __arm_smmu_sva_unbind(struct iommu_sva = *handle) if (!smmu_mn->cleared) { arm_smmu_tlb_inv_asid(smmu_domain->smmu, smmu_mn->cd->asid); - /* TODO: invalidate ATS */ + arm_smmu_atc_inv_domain(smmu_domain, bond->mm->pasid, + 0, 0); } } =20 --=20 2.26.2