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Thu, 30 Apr 2020 07:40:31 -0700 (PDT) Received: from localhost.localdomain ([2001:171b:226e:c200:c43b:ef78:d083:b355]) by smtp.gmail.com with ESMTPSA id n2sm4153286wrt.33.2020.04.30.07.40.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Apr 2020 07:40:31 -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 , Suzuki K Poulose Subject: [PATCH v6 11/25] iommu/arm-smmu-v3: Share process page tables Date: Thu, 30 Apr 2020 16:34:10 +0200 Message-Id: <20200430143424.2787566-12-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 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: With Shared Virtual Addressing (SVA), we need to mirror CPU TTBR, TCR, MAIR and ASIDs in SMMU contexts. Each SMMU has a single ASID space split into two sets, shared and private. Shared ASIDs correspond to those obtained from the arch ASID allocator, and private ASIDs are used for "classic" map/unmap DMA. Cc: Suzuki K Poulose Signed-off-by: Jean-Philippe Brucker Acked-by: Suzuki K Poulose --- drivers/iommu/arm-smmu-v3.c | 156 +++++++++++++++++++++++++++++++++++- 1 file changed, 152 insertions(+), 4 deletions(-) diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index 96ee60002e85e..fb3116045df0f 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include @@ -33,6 +34,8 @@ #include +#include "io-pgtable-arm.h" + /* MMIO registers */ #define ARM_SMMU_IDR0 0x0 #define IDR0_ST_LVL GENMASK(28, 27) @@ -587,6 +590,9 @@ struct arm_smmu_ctx_desc { u64 ttbr; u64 tcr; u64 mair; + + refcount_t refs; + struct mm_struct *mm; }; struct arm_smmu_l1_ctx_desc { @@ -1660,7 +1666,8 @@ static int arm_smmu_write_ctx_desc(struct arm_smmu_domain *smmu_domain, #ifdef __BIG_ENDIAN CTXDESC_CD_0_ENDI | #endif - CTXDESC_CD_0_R | CTXDESC_CD_0_A | CTXDESC_CD_0_ASET | + CTXDESC_CD_0_R | CTXDESC_CD_0_A | + (cd->mm ? 0 : CTXDESC_CD_0_ASET) | CTXDESC_CD_0_AA64 | FIELD_PREP(CTXDESC_CD_0_ASID, cd->asid) | CTXDESC_CD_0_V; @@ -1764,12 +1771,151 @@ static void arm_smmu_free_cd_tables(struct arm_smmu_domain *smmu_domain) cdcfg->cdtab = NULL; } -static void arm_smmu_free_asid(struct arm_smmu_ctx_desc *cd) +static void arm_smmu_init_cd(struct arm_smmu_ctx_desc *cd) { + refcount_set(&cd->refs, 1); +} + +static bool arm_smmu_free_asid(struct arm_smmu_ctx_desc *cd) +{ + bool free; + struct arm_smmu_ctx_desc *old_cd; + if (!cd->asid) - return; + return false; + + xa_lock(&asid_xa); + free = refcount_dec_and_test(&cd->refs); + if (free) { + old_cd = __xa_erase(&asid_xa, cd->asid); + WARN_ON(old_cd != cd); + } + xa_unlock(&asid_xa); + return free; +} + +static struct arm_smmu_ctx_desc *arm_smmu_share_asid(u16 asid) +{ + struct arm_smmu_ctx_desc *cd; - xa_erase(&asid_xa, cd->asid); + cd = xa_load(&asid_xa, asid); + if (!cd) + return NULL; + + if (cd->mm) { + /* All devices bound to this mm use the same cd struct. */ + refcount_inc(&cd->refs); + return cd; + } + + /* + * Ouch, ASID is already in use for a private cd. + * TODO: seize it. + */ + return ERR_PTR(-EEXIST); +} + +__maybe_unused +static struct arm_smmu_ctx_desc *arm_smmu_alloc_shared_cd(struct mm_struct *mm) +{ + u16 asid; + int ret = 0; + u64 tcr, par, reg; + struct arm_smmu_ctx_desc *cd; + struct arm_smmu_ctx_desc *old_cd = NULL; + + asid = mm_context_get(mm); + if (!asid) + return ERR_PTR(-ESRCH); + + cd = kzalloc(sizeof(*cd), GFP_KERNEL); + if (!cd) { + ret = -ENOMEM; + goto err_put_context; + } + + arm_smmu_init_cd(cd); + + xa_lock(&asid_xa); + old_cd = arm_smmu_share_asid(asid); + if (!old_cd) { + old_cd = __xa_store(&asid_xa, asid, cd, GFP_ATOMIC); + /* + * Keep error, clear valid pointers. If there was an old entry + * it has been moved already by arm_smmu_share_asid(). + */ + old_cd = ERR_PTR(xa_err(old_cd)); + cd->asid = asid; + } + xa_unlock(&asid_xa); + + if (IS_ERR(old_cd)) { + ret = PTR_ERR(old_cd); + goto err_free_cd; + } else if (old_cd) { + if (WARN_ON(old_cd->mm != mm)) { + ret = -EINVAL; + goto err_free_cd; + } + kfree(cd); + mm_context_put(mm); + return old_cd; + } + + tcr = FIELD_PREP(CTXDESC_CD_0_TCR_T0SZ, 64ULL - VA_BITS) | + FIELD_PREP(CTXDESC_CD_0_TCR_IRGN0, ARM_LPAE_TCR_RGN_WBWA) | + FIELD_PREP(CTXDESC_CD_0_TCR_ORGN0, ARM_LPAE_TCR_RGN_WBWA) | + FIELD_PREP(CTXDESC_CD_0_TCR_SH0, ARM_LPAE_TCR_SH_IS) | + CTXDESC_CD_0_TCR_EPD1 | CTXDESC_CD_0_AA64; + + switch (PAGE_SIZE) { + case SZ_4K: + tcr |= FIELD_PREP(CTXDESC_CD_0_TCR_TG0, ARM_LPAE_TCR_TG0_4K); + break; + case SZ_16K: + tcr |= FIELD_PREP(CTXDESC_CD_0_TCR_TG0, ARM_LPAE_TCR_TG0_16K); + break; + case SZ_64K: + tcr |= FIELD_PREP(CTXDESC_CD_0_TCR_TG0, ARM_LPAE_TCR_TG0_64K); + break; + default: + WARN_ON(1); + ret = -EINVAL; + goto err_free_asid; + } + + reg = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1); + par = cpuid_feature_extract_unsigned_field(reg, ID_AA64MMFR0_PARANGE_SHIFT); + tcr |= FIELD_PREP(CTXDESC_CD_0_TCR_IPS, par); + + cd->ttbr = virt_to_phys(mm->pgd); + cd->tcr = tcr; + /* + * MAIR value is pretty much constant and global, so we can just get it + * from the current CPU register + */ + cd->mair = read_sysreg(mair_el1); + cd->mm = mm; + + return cd; + +err_free_asid: + arm_smmu_free_asid(cd); +err_free_cd: + kfree(cd); +err_put_context: + mm_context_put(mm); + return ERR_PTR(ret); +} + +__maybe_unused +static void arm_smmu_free_shared_cd(struct arm_smmu_ctx_desc *cd) +{ + if (arm_smmu_free_asid(cd)) { + /* Unpin ASID */ + mm_context_put(cd->mm); + kfree(cd); + } } /* Stream table manipulation functions */ @@ -2479,6 +2625,8 @@ static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain, struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg; typeof(&pgtbl_cfg->arm_lpae_s1_cfg.tcr) tcr = &pgtbl_cfg->arm_lpae_s1_cfg.tcr; + arm_smmu_init_cd(&cfg->cd); + ret = xa_alloc(&asid_xa, &asid, &cfg->cd, XA_LIMIT(1, (1 << smmu->asid_bits) - 1), GFP_KERNEL); if (ret)