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Mon, 24 Feb 2020 10:24:45 -0800 (PST) Received: from localhost.localdomain ([2001:171b:c9a8:fbc0:116c:c27a:3e7f:5eaf]) by smtp.gmail.com with ESMTPSA id n3sm304255wmc.27.2020.02.24.10.24.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Feb 2020 10:24:45 -0800 (PST) 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, robh+dt@kernel.org, mark.rutland@arm.com, 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, yi.l.liu@intel.com, zhangfei.gao@linaro.org, Jean-Philippe Brucker Subject: [PATCH v4 15/26] iommu/arm-smmu-v3: Add SVA feature checking Date: Mon, 24 Feb 2020 19:23:50 +0100 Message-Id: <20200224182401.353359-16-jean-philippe@linaro.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200224182401.353359-1-jean-philippe@linaro.org> References: <20200224182401.353359-1-jean-philippe@linaro.org> MIME-Version: 1.0 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: From: Jean-Philippe Brucker Aggregate all sanity-checks for sharing CPU page tables with the SMMU under a single ARM_SMMU_FEAT_SVA bit. For PCIe SVA, users also need to check FEAT_ATS and FEAT_PRI. For platform SVA, they will most likely have to check FEAT_STALLS. Signed-off-by: Jean-Philippe Brucker --- drivers/iommu/arm-smmu-v3.c | 72 +++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index b72b2fdcd21f..77a846440ba6 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -644,6 +644,7 @@ struct arm_smmu_device { #define ARM_SMMU_FEAT_VAX (1 << 14) #define ARM_SMMU_FEAT_E2H (1 << 15) #define ARM_SMMU_FEAT_BTM (1 << 16) +#define ARM_SMMU_FEAT_SVA (1 << 17) u32 features; #define ARM_SMMU_OPT_SKIP_PREFETCH (1 << 0) @@ -3873,6 +3874,74 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass) return 0; } +static bool arm_smmu_supports_sva(struct arm_smmu_device *smmu) +{ + unsigned long reg, fld; + unsigned long oas; + unsigned long asid_bits; + + u32 feat_mask = ARM_SMMU_FEAT_BTM | ARM_SMMU_FEAT_COHERENCY; + + if ((smmu->features & feat_mask) != feat_mask) + return false; + + if (!(smmu->pgsize_bitmap & PAGE_SIZE)) + return false; + + /* + * Get the smallest PA size of all CPUs (sanitized by cpufeature). We're + * not even pretending to support AArch32 here. + */ + reg = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1); + fld = cpuid_feature_extract_unsigned_field(reg, ID_AA64MMFR0_PARANGE_SHIFT); + switch (fld) { + case 0x0: + oas = 32; + break; + case 0x1: + oas = 36; + break; + case 0x2: + oas = 40; + break; + case 0x3: + oas = 42; + break; + case 0x4: + oas = 44; + break; + case 0x5: + oas = 48; + break; + case 0x6: + oas = 52; + break; + default: + return false; + } + + /* abort if MMU outputs addresses greater than what we support. */ + if (smmu->oas < oas) + return false; + + /* We can support bigger ASIDs than the CPU, but not smaller */ + fld = cpuid_feature_extract_unsigned_field(reg, ID_AA64MMFR0_ASID_SHIFT); + asid_bits = fld ? 16 : 8; + if (smmu->asid_bits < asid_bits) + return false; + + /* + * See max_pinned_asids in arch/arm64/mm/context.c. The following is + * generally the maximum number of bindable processes. + */ + if (IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0)) + asid_bits--; + dev_dbg(smmu->dev, "%d shared contexts\n", (1 << asid_bits) - + num_possible_cpus() - 2); + + return true; +} + static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu) { u32 reg; @@ -4080,6 +4149,9 @@ static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu) smmu->ias = max(smmu->ias, smmu->oas); + if (arm_smmu_supports_sva(smmu)) + smmu->features |= ARM_SMMU_FEAT_SVA; + dev_info(smmu->dev, "ias %lu-bit, oas %lu-bit (features 0x%08x)\n", smmu->ias, smmu->oas, smmu->features); return 0;