From: Auger Eric <eric.auger@redhat.com>
To: Jean-Philippe Brucker <jean-philippe@linaro.org>,
linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-acpi@vger.kernel.org, devicetree@vger.kernel.org,
iommu@lists.linux-foundation.org
Cc: joro@8bytes.org, robh+dt@kernel.org, mark.rutland@arm.com,
lorenzo.pieralisi@arm.com, guohanjun@huawei.com,
sudeep.holla@arm.com, rjw@rjwysocki.net, lenb@kernel.org,
will@kernel.org, robin.murphy@arm.com, bhelgaas@google.com,
jonathan.cameron@huawei.com, zhangfei.gao@linaro.org
Subject: Re: [PATCH v4 10/13] iommu/arm-smmu-v3: Add second level of context descriptor table
Date: Fri, 20 Dec 2019 08:37:36 +0100 [thread overview]
Message-ID: <d663f79a-d53b-d410-1757-979c50436ce3@redhat.com> (raw)
In-Reply-To: <20191219163033.2608177-11-jean-philippe@linaro.org>
Hi Jean,
On 12/19/19 5:30 PM, Jean-Philippe Brucker wrote:
> The SMMU can support up to 20 bits of SSID. Add a second level of page
> tables to accommodate this. Devices that support more than 1024 SSIDs now
> have a table of 1024 L1 entries (8kB), pointing to tables of 1024 context
> descriptors (64kB), allocated on demand.
>
> Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Thanks
Eric
> ---
> drivers/iommu/arm-smmu-v3.c | 154 +++++++++++++++++++++++++++++++++---
> 1 file changed, 144 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> index b825a5639afc..bf106a7b53eb 100644
> --- a/drivers/iommu/arm-smmu-v3.c
> +++ b/drivers/iommu/arm-smmu-v3.c
> @@ -224,6 +224,7 @@
>
> #define STRTAB_STE_0_S1FMT GENMASK_ULL(5, 4)
> #define STRTAB_STE_0_S1FMT_LINEAR 0
> +#define STRTAB_STE_0_S1FMT_64K_L2 2
> #define STRTAB_STE_0_S1CTXPTR_MASK GENMASK_ULL(51, 6)
> #define STRTAB_STE_0_S1CDMAX GENMASK_ULL(63, 59)
>
> @@ -263,7 +264,20 @@
>
> #define STRTAB_STE_3_S2TTB_MASK GENMASK_ULL(51, 4)
>
> -/* Context descriptor (stage-1 only) */
> +/*
> + * Context descriptors.
> + *
> + * Linear: when less than 1024 SSIDs are supported
> + * 2lvl: at most 1024 L1 entries,
> + * 1024 lazy entries per table.
> + */
> +#define CTXDESC_SPLIT 10
> +#define CTXDESC_L2_ENTRIES (1 << CTXDESC_SPLIT)
> +
> +#define CTXDESC_L1_DESC_DWORDS 1
> +#define CTXDESC_L1_DESC_VALID 1
> +#define CTXDESC_L1_DESC_L2PTR_MASK GENMASK_ULL(51, 12)
> +
> #define CTXDESC_CD_DWORDS 8
> #define CTXDESC_CD_0_TCR_T0SZ GENMASK_ULL(5, 0)
> #define ARM64_TCR_T0SZ GENMASK_ULL(5, 0)
> @@ -575,7 +589,12 @@ struct arm_smmu_cd_table {
> };
>
> struct arm_smmu_s1_cfg {
> - struct arm_smmu_cd_table table;
> + /* Leaf tables or linear table */
> + struct arm_smmu_cd_table *tables;
> + size_t num_tables;
> + /* First level tables, when two levels are used */
> + __le64 *l1ptr;
> + dma_addr_t l1ptr_dma;
> struct arm_smmu_ctx_desc cd;
> u8 s1fmt;
> u8 s1cdmax;
> @@ -1521,9 +1540,48 @@ static void arm_smmu_free_cd_leaf_table(struct arm_smmu_device *smmu,
> {
> size_t size = num_entries * (CTXDESC_CD_DWORDS << 3);
>
> + if (!table->ptr)
> + return;
> dmam_free_coherent(smmu->dev, size, table->ptr, table->ptr_dma);
> }
>
> +static void arm_smmu_write_cd_l1_desc(__le64 *dst,
> + struct arm_smmu_cd_table *table)
> +{
> + u64 val = (table->ptr_dma & CTXDESC_L1_DESC_L2PTR_MASK) |
> + CTXDESC_L1_DESC_VALID;
> +
> + WRITE_ONCE(*dst, cpu_to_le64(val));
> +}
> +
> +static __le64 *arm_smmu_get_cd_ptr(struct arm_smmu_domain *smmu_domain,
> + u32 ssid)
> +{
> + __le64 *l1ptr;
> + unsigned int idx;
> + struct arm_smmu_cd_table *table;
> + struct arm_smmu_device *smmu = smmu_domain->smmu;
> + struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;
> +
> + if (cfg->s1fmt == STRTAB_STE_0_S1FMT_LINEAR)
> + return cfg->tables[0].ptr + ssid * CTXDESC_CD_DWORDS;
> +
> + idx = ssid >> CTXDESC_SPLIT;
> + table = &cfg->tables[idx];
> + if (!table->ptr) {
> + if (arm_smmu_alloc_cd_leaf_table(smmu, table,
> + CTXDESC_L2_ENTRIES))
> + return NULL;
> +
> + l1ptr = cfg->l1ptr + idx * CTXDESC_L1_DESC_DWORDS;
> + arm_smmu_write_cd_l1_desc(l1ptr, table);
> + /* An invalid L1CD can be cached */
> + arm_smmu_sync_cd(smmu_domain, ssid, false);
> + }
> + idx = ssid & (CTXDESC_L2_ENTRIES - 1);
> + return table->ptr + idx * CTXDESC_CD_DWORDS;
> +}
> +
> static u64 arm_smmu_cpu_tcr_to_cd(u64 tcr)
> {
> u64 val = 0;
> @@ -1556,8 +1614,14 @@ static int arm_smmu_write_ctx_desc(struct arm_smmu_domain *smmu_domain,
> u64 val;
> bool cd_live;
> struct arm_smmu_device *smmu = smmu_domain->smmu;
> - __le64 *cdptr = smmu_domain->s1_cfg.table.ptr + ssid *
> - CTXDESC_CD_DWORDS;
> + __le64 *cdptr;
> +
> + if (WARN_ON(ssid >= (1 << smmu_domain->s1_cfg.s1cdmax)))
> + return -E2BIG;
> +
> + cdptr = arm_smmu_get_cd_ptr(smmu_domain, ssid);
> + if (!cdptr)
> + return -ENOMEM;
>
> val = le64_to_cpu(cdptr[0]);
> cd_live = !!(val & CTXDESC_CD_0_V);
> @@ -1604,20 +1668,87 @@ static int arm_smmu_write_ctx_desc(struct arm_smmu_domain *smmu_domain,
>
> static int arm_smmu_alloc_cd_tables(struct arm_smmu_domain *smmu_domain)
> {
> + int ret;
> + size_t size = 0;
> + size_t max_contexts;
> struct arm_smmu_device *smmu = smmu_domain->smmu;
> struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;
>
> - cfg->s1fmt = STRTAB_STE_0_S1FMT_LINEAR;
> - return arm_smmu_alloc_cd_leaf_table(smmu, &cfg->table,
> - 1 << cfg->s1cdmax);
> + max_contexts = 1 << cfg->s1cdmax;
> +
> + if (!(smmu->features & ARM_SMMU_FEAT_2_LVL_CDTAB) ||
> + max_contexts <= CTXDESC_L2_ENTRIES) {
> + cfg->s1fmt = STRTAB_STE_0_S1FMT_LINEAR;
> + cfg->num_tables = 1;
> + } else {
> + cfg->s1fmt = STRTAB_STE_0_S1FMT_64K_L2;
> + cfg->num_tables = DIV_ROUND_UP(max_contexts,
> + CTXDESC_L2_ENTRIES);
> +
> + size = cfg->num_tables * (CTXDESC_L1_DESC_DWORDS << 3);
> + cfg->l1ptr = dmam_alloc_coherent(smmu->dev, size,
> + &cfg->l1ptr_dma,
> + GFP_KERNEL);
> + if (!cfg->l1ptr) {
> + dev_warn(smmu->dev,
> + "failed to allocate L1 context table\n");
> + return -ENOMEM;
> + }
> + }
> +
> + cfg->tables = devm_kzalloc(smmu->dev, sizeof(struct arm_smmu_cd_table) *
> + cfg->num_tables, GFP_KERNEL);
> + if (!cfg->tables) {
> + ret = -ENOMEM;
> + goto err_free_l1;
> + }
> +
> + /*
> + * Only allocate a leaf table for linear case. With two levels, leaf
> + * tables are allocated lazily.
> + */
> + if (cfg->s1fmt == STRTAB_STE_0_S1FMT_LINEAR) {
> + ret = arm_smmu_alloc_cd_leaf_table(smmu, &cfg->tables[0],
> + max_contexts);
> + if (ret)
> + goto err_free_tables;
> + }
> +
> + return 0;
> +
> +err_free_tables:
> + devm_kfree(smmu->dev, cfg->tables);
> + cfg->tables = NULL;
> +err_free_l1:
> + if (cfg->l1ptr) {
> + dmam_free_coherent(smmu->dev, size, cfg->l1ptr, cfg->l1ptr_dma);
> + cfg->l1ptr = NULL;
> + cfg->l1ptr_dma = 0;
> + }
> + return ret;
> }
>
> static void arm_smmu_free_cd_tables(struct arm_smmu_domain *smmu_domain)
> {
> + int i;
> struct arm_smmu_device *smmu = smmu_domain->smmu;
> struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;
> + size_t num_leaf_entries = 1 << cfg->s1cdmax;
> + struct arm_smmu_cd_table *table = cfg->tables;
> +
> + if (cfg->l1ptr) {
> + size_t size = cfg->num_tables * (CTXDESC_L1_DESC_DWORDS << 3);
>
> - arm_smmu_free_cd_leaf_table(smmu, &cfg->table, 1 << cfg->s1cdmax);
> + dmam_free_coherent(smmu->dev, size, cfg->l1ptr, cfg->l1ptr_dma);
> + cfg->l1ptr = NULL;
> + cfg->l1ptr_dma = 0;
> + num_leaf_entries = CTXDESC_L2_ENTRIES;
> + }
> +
> + for (i = 0; i < cfg->num_tables; i++, table++)
> + arm_smmu_free_cd_leaf_table(smmu, table, num_leaf_entries);
> + devm_kfree(smmu->dev, cfg->tables);
> + cfg->tables = NULL;
> }
>
> /* Stream table manipulation functions */
> @@ -1737,6 +1868,9 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_master *master, u32 sid,
> }
>
> if (s1_cfg) {
> + dma_addr_t ptr_dma = s1_cfg->l1ptr ? s1_cfg->l1ptr_dma :
> + s1_cfg->tables[0].ptr_dma;
> +
> BUG_ON(ste_live);
> dst[1] = cpu_to_le64(
> FIELD_PREP(STRTAB_STE_1_S1DSS, STRTAB_STE_1_S1DSS_SSID0) |
> @@ -1749,7 +1883,7 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_master *master, u32 sid,
> !(smmu->features & ARM_SMMU_FEAT_STALL_FORCE))
> dst[1] |= cpu_to_le64(STRTAB_STE_1_S1STALLD);
>
> - val |= (s1_cfg->table.ptr_dma & STRTAB_STE_0_S1CTXPTR_MASK) |
> + val |= (ptr_dma & STRTAB_STE_0_S1CTXPTR_MASK) |
> FIELD_PREP(STRTAB_STE_0_CFG, STRTAB_STE_0_CFG_S1_TRANS) |
> FIELD_PREP(STRTAB_STE_0_S1CDMAX, s1_cfg->s1cdmax) |
> FIELD_PREP(STRTAB_STE_0_S1FMT, s1_cfg->s1fmt);
> @@ -2265,7 +2399,7 @@ static void arm_smmu_domain_free(struct iommu_domain *domain)
> if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
> struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;
>
> - if (cfg->table.ptr) {
> + if (cfg->tables) {
> arm_smmu_free_cd_tables(smmu_domain);
> arm_smmu_bitmap_free(smmu->asid_map, cfg->cd.asid);
> }
>
next prev parent reply other threads:[~2019-12-20 7:37 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-19 16:30 [PATCH v4 00/13] iommu: Add PASID support to Arm SMMUv3 Jean-Philippe Brucker
2019-12-19 16:30 ` [PATCH v4 01/13] iommu/arm-smmu-v3: Drop __GFP_ZERO flag from DMA allocation Jean-Philippe Brucker
2019-12-19 16:30 ` [PATCH v4 02/13] dt-bindings: document PASID property for IOMMU masters Jean-Philippe Brucker
2019-12-19 16:30 ` [PATCH v4 03/13] iommu/arm-smmu-v3: Parse PASID devicetree property of platform devices Jean-Philippe Brucker
2019-12-19 16:30 ` [PATCH v4 04/13] ACPI/IORT: Parse SSID property of named component node Jean-Philippe Brucker
2019-12-19 16:30 ` [PATCH v4 05/13] iommu/arm-smmu-v3: Prepare arm_smmu_s1_cfg for SSID support Jean-Philippe Brucker
2019-12-19 16:30 ` [PATCH v4 06/13] iommu/arm-smmu-v3: Add context descriptor tables allocators Jean-Philippe Brucker
2020-01-14 11:06 ` Will Deacon
2020-01-14 11:52 ` Jean-Philippe Brucker
2020-01-14 11:56 ` Will Deacon
2019-12-19 16:30 ` [PATCH v4 07/13] iommu/arm-smmu-v3: Add support for Substream IDs Jean-Philippe Brucker
2020-01-14 12:38 ` Will Deacon
2020-01-14 16:30 ` Jean-Philippe Brucker
2019-12-19 16:30 ` [PATCH v4 08/13] iommu/arm-smmu-v3: Propagate ssid_bits Jean-Philippe Brucker
2019-12-19 16:30 ` [PATCH v4 09/13] iommu/arm-smmu-v3: Prepare for handling arm_smmu_write_ctx_desc() failure Jean-Philippe Brucker
2020-01-14 12:42 ` Will Deacon
2020-01-14 16:31 ` Jean-Philippe Brucker
2019-12-19 16:30 ` [PATCH v4 10/13] iommu/arm-smmu-v3: Add second level of context descriptor table Jean-Philippe Brucker
2019-12-20 7:37 ` Auger Eric [this message]
2020-01-14 15:04 ` Will Deacon
2020-01-15 9:45 ` Jean-Philippe Brucker
2019-12-19 16:30 ` [PATCH v4 11/13] iommu/arm-smmu-v3: Improve add_device() error handling Jean-Philippe Brucker
2020-01-14 15:25 ` Will Deacon
2020-01-15 16:17 ` Will Deacon
2020-01-15 17:44 ` Robin Murphy
2019-12-19 16:30 ` [PATCH v4 12/13] PCI/ATS: Add PASID stubs Jean-Philippe Brucker
2019-12-19 16:30 ` [PATCH v4 13/13] iommu/arm-smmu-v3: Add support for PCI PASID Jean-Philippe Brucker
2019-12-20 7:37 ` Auger Eric
2020-01-14 12:45 ` Will Deacon
2020-01-15 7:57 ` Jean-Philippe Brucker
2020-01-09 14:36 ` [PATCH v4 00/13] iommu: Add PASID support to Arm SMMUv3 Jean-Philippe Brucker
2020-01-09 14:41 ` Will Deacon
2020-01-10 7:15 ` Jean-Philippe Brucker
2020-01-14 15:40 ` Will Deacon
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