From: Tirumalesh Chalamarla Date: Fri, 4 Mar 2016 21:56:09 +0000 (-0800) Subject: iommu/arm-smmu: Workaround for ThunderX erratum #27704 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1bd37a6835bef0ecd2138cb42f9088fd890f9939;p=linux-beck.git iommu/arm-smmu: Workaround for ThunderX erratum #27704 Due to erratum #27704, the CN88xx SMMUv2 implementation supports only shared ASID and VMID numberspaces. This patch ensures that ASID and VMIDs are unique across all SMMU instances on affected Cavium systems. Signed-off-by: Tirumalesh Chalamarla Signed-off-by: Akula Geethasowjanya [will: commit message, comments and formatting] Signed-off-by: Will Deacon --- diff --git a/Documentation/arm64/silicon-errata.txt b/Documentation/arm64/silicon-errata.txt index ba4b6acfc545..806f91cdd45d 100644 --- a/Documentation/arm64/silicon-errata.txt +++ b/Documentation/arm64/silicon-errata.txt @@ -57,3 +57,4 @@ stable kernels. | Cavium | ThunderX ITS | #22375, #24313 | CAVIUM_ERRATUM_22375 | | Cavium | ThunderX GICv3 | #23154 | CAVIUM_ERRATUM_23154 | | Cavium | ThunderX Core | #27456 | CAVIUM_ERRATUM_27456 | +| Cavium | ThunderX SMMUv2 | #27704 | N/A | diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.txt b/Documentation/devicetree/bindings/iommu/arm,smmu.txt index 718074501fcb..19fe6f2c83f6 100644 --- a/Documentation/devicetree/bindings/iommu/arm,smmu.txt +++ b/Documentation/devicetree/bindings/iommu/arm,smmu.txt @@ -16,6 +16,7 @@ conditions. "arm,mmu-400" "arm,mmu-401" "arm,mmu-500" + "cavium,smmu-v2" depending on the particular implementation and/or the version of the architecture implemented. diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 25e884a75f6b..e933679a3266 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -334,6 +334,8 @@ struct arm_smmu_device { struct list_head list; struct rb_root masters; + + u32 cavium_id_base; /* Specific to Cavium */ }; struct arm_smmu_cfg { @@ -343,8 +345,8 @@ struct arm_smmu_cfg { }; #define INVALID_IRPTNDX 0xff -#define ARM_SMMU_CB_ASID(cfg) ((cfg)->cbndx) -#define ARM_SMMU_CB_VMID(cfg) ((cfg)->cbndx + 1) +#define ARM_SMMU_CB_ASID(smmu, cfg) ((u16)(smmu)->cavium_id_base + (cfg)->cbndx) +#define ARM_SMMU_CB_VMID(smmu, cfg) ((u16)(smmu)->cavium_id_base + (cfg)->cbndx + 1) enum arm_smmu_domain_stage { ARM_SMMU_DOMAIN_S1 = 0, @@ -372,6 +374,8 @@ struct arm_smmu_option_prop { const char *prop; }; +static atomic_t cavium_smmu_context_count = ATOMIC_INIT(0); + static struct arm_smmu_option_prop arm_smmu_options[] = { { ARM_SMMU_OPT_SECURE_CFG_ACCESS, "calxeda,smmu-secure-config-access" }, { 0, NULL}, @@ -583,11 +587,11 @@ static void arm_smmu_tlb_inv_context(void *cookie) if (stage1) { base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, cfg->cbndx); - writel_relaxed(ARM_SMMU_CB_ASID(cfg), + writel_relaxed(ARM_SMMU_CB_ASID(smmu, cfg), base + ARM_SMMU_CB_S1_TLBIASID); } else { base = ARM_SMMU_GR0(smmu); - writel_relaxed(ARM_SMMU_CB_VMID(cfg), + writel_relaxed(ARM_SMMU_CB_VMID(smmu, cfg), base + ARM_SMMU_GR0_TLBIVMID); } @@ -609,7 +613,7 @@ static void arm_smmu_tlb_inv_range_nosync(unsigned long iova, size_t size, if (!IS_ENABLED(CONFIG_64BIT) || smmu->version == ARM_SMMU_V1) { iova &= ~12UL; - iova |= ARM_SMMU_CB_ASID(cfg); + iova |= ARM_SMMU_CB_ASID(smmu, cfg); do { writel_relaxed(iova, reg); iova += granule; @@ -617,7 +621,7 @@ static void arm_smmu_tlb_inv_range_nosync(unsigned long iova, size_t size, #ifdef CONFIG_64BIT } else { iova >>= 12; - iova |= (u64)ARM_SMMU_CB_ASID(cfg) << 48; + iova |= (u64)ARM_SMMU_CB_ASID(smmu, cfg) << 48; do { writeq_relaxed(iova, reg); iova += granule >> 12; @@ -637,7 +641,7 @@ static void arm_smmu_tlb_inv_range_nosync(unsigned long iova, size_t size, #endif } else { reg = ARM_SMMU_GR0(smmu) + ARM_SMMU_GR0_TLBIVMID; - writel_relaxed(ARM_SMMU_CB_VMID(cfg), reg); + writel_relaxed(ARM_SMMU_CB_VMID(smmu, cfg), reg); } } @@ -746,7 +750,7 @@ static void arm_smmu_init_context_bank(struct arm_smmu_domain *smmu_domain, #endif /* 16-bit VMIDs live in CBA2R */ if (smmu->features & ARM_SMMU_FEAT_VMID16) - reg |= ARM_SMMU_CB_VMID(cfg) << CBA2R_VMID_SHIFT; + reg |= ARM_SMMU_CB_VMID(smmu, cfg) << CBA2R_VMID_SHIFT; writel_relaxed(reg, gr1_base + ARM_SMMU_GR1_CBA2R(cfg->cbndx)); } @@ -765,7 +769,7 @@ static void arm_smmu_init_context_bank(struct arm_smmu_domain *smmu_domain, (CBAR_S1_MEMATTR_WB << CBAR_S1_MEMATTR_SHIFT); } else if (!(smmu->features & ARM_SMMU_FEAT_VMID16)) { /* 8-bit VMIDs live in CBAR */ - reg |= ARM_SMMU_CB_VMID(cfg) << CBAR_VMID_SHIFT; + reg |= ARM_SMMU_CB_VMID(smmu, cfg) << CBAR_VMID_SHIFT; } writel_relaxed(reg, gr1_base + ARM_SMMU_GR1_CBAR(cfg->cbndx)); @@ -773,11 +777,11 @@ static void arm_smmu_init_context_bank(struct arm_smmu_domain *smmu_domain, if (stage1) { reg64 = pgtbl_cfg->arm_lpae_s1_cfg.ttbr[0]; - reg64 |= ((u64)ARM_SMMU_CB_ASID(cfg)) << TTBRn_ASID_SHIFT; + reg64 |= ((u64)ARM_SMMU_CB_ASID(smmu, cfg)) << TTBRn_ASID_SHIFT; smmu_writeq(reg64, cb_base + ARM_SMMU_CB_TTBR0); reg64 = pgtbl_cfg->arm_lpae_s1_cfg.ttbr[1]; - reg64 |= ((u64)ARM_SMMU_CB_ASID(cfg)) << TTBRn_ASID_SHIFT; + reg64 |= ((u64)ARM_SMMU_CB_ASID(smmu, cfg)) << TTBRn_ASID_SHIFT; smmu_writeq(reg64, cb_base + ARM_SMMU_CB_TTBR1); } else { reg64 = pgtbl_cfg->arm_lpae_s2_cfg.vttbr; @@ -1737,6 +1741,7 @@ static const struct of_device_id arm_smmu_of_match[] = { { .compatible = "arm,mmu-400", .data = (void *)ARM_SMMU_V1 }, { .compatible = "arm,mmu-401", .data = (void *)ARM_SMMU_V1 }, { .compatible = "arm,mmu-500", .data = (void *)ARM_SMMU_V2 }, + { .compatible = "cavium,smmu-v2", .data = (void *)ARM_SMMU_V2 }, { }, }; MODULE_DEVICE_TABLE(of, arm_smmu_of_match); @@ -1847,6 +1852,18 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev) } } + /* + * Cavium CN88xx erratum #27704. + * Ensure ASID and VMID allocation is unique across all SMMUs in + * the system. + */ + if (of_device_is_compatible(dev->of_node, "cavium,smmu-v2")) { + smmu->cavium_id_base = + atomic_add_return(smmu->num_context_banks, + &cavium_smmu_context_count); + smmu->cavium_id_base -= smmu->num_context_banks; + } + INIT_LIST_HEAD(&smmu->list); spin_lock(&arm_smmu_devices_lock); list_add(&smmu->list, &arm_smmu_devices);