diff options
Diffstat (limited to 'drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c')
| -rw-r--r-- | drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 479 |
1 files changed, 479 insertions, 0 deletions
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c new file mode 100644 index 000000000..d80065c81 --- /dev/null +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c @@ -0,0 +1,479 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2019, The Linux Foundation. All rights reserved. + */ + +#include <linux/acpi.h> +#include <linux/adreno-smmu-priv.h> +#include <linux/delay.h> +#include <linux/of_device.h> +#include <linux/qcom_scm.h> + +#include "arm-smmu.h" +#include "arm-smmu-qcom.h" + +#define QCOM_DUMMY_VAL -1 + +static struct qcom_smmu *to_qcom_smmu(struct arm_smmu_device *smmu) +{ + return container_of(smmu, struct qcom_smmu, smmu); +} + +static void qcom_smmu_tlb_sync(struct arm_smmu_device *smmu, int page, + int sync, int status) +{ + unsigned int spin_cnt, delay; + u32 reg; + + arm_smmu_writel(smmu, page, sync, QCOM_DUMMY_VAL); + for (delay = 1; delay < TLB_LOOP_TIMEOUT; delay *= 2) { + for (spin_cnt = TLB_SPIN_COUNT; spin_cnt > 0; spin_cnt--) { + reg = arm_smmu_readl(smmu, page, status); + if (!(reg & ARM_SMMU_sTLBGSTATUS_GSACTIVE)) + return; + cpu_relax(); + } + udelay(delay); + } + + qcom_smmu_tlb_sync_debug(smmu); +} + +static void qcom_adreno_smmu_write_sctlr(struct arm_smmu_device *smmu, int idx, + u32 reg) +{ + struct qcom_smmu *qsmmu = to_qcom_smmu(smmu); + + /* + * On the GPU device we want to process subsequent transactions after a + * fault to keep the GPU from hanging + */ + reg |= ARM_SMMU_SCTLR_HUPCF; + + if (qsmmu->stall_enabled & BIT(idx)) + reg |= ARM_SMMU_SCTLR_CFCFG; + + arm_smmu_cb_write(smmu, idx, ARM_SMMU_CB_SCTLR, reg); +} + +static void qcom_adreno_smmu_get_fault_info(const void *cookie, + struct adreno_smmu_fault_info *info) +{ + struct arm_smmu_domain *smmu_domain = (void *)cookie; + struct arm_smmu_cfg *cfg = &smmu_domain->cfg; + struct arm_smmu_device *smmu = smmu_domain->smmu; + + info->fsr = arm_smmu_cb_read(smmu, cfg->cbndx, ARM_SMMU_CB_FSR); + info->fsynr0 = arm_smmu_cb_read(smmu, cfg->cbndx, ARM_SMMU_CB_FSYNR0); + info->fsynr1 = arm_smmu_cb_read(smmu, cfg->cbndx, ARM_SMMU_CB_FSYNR1); + info->far = arm_smmu_cb_readq(smmu, cfg->cbndx, ARM_SMMU_CB_FAR); + info->cbfrsynra = arm_smmu_gr1_read(smmu, ARM_SMMU_GR1_CBFRSYNRA(cfg->cbndx)); + info->ttbr0 = arm_smmu_cb_readq(smmu, cfg->cbndx, ARM_SMMU_CB_TTBR0); + info->contextidr = arm_smmu_cb_read(smmu, cfg->cbndx, ARM_SMMU_CB_CONTEXTIDR); +} + +static void qcom_adreno_smmu_set_stall(const void *cookie, bool enabled) +{ + struct arm_smmu_domain *smmu_domain = (void *)cookie; + struct arm_smmu_cfg *cfg = &smmu_domain->cfg; + struct qcom_smmu *qsmmu = to_qcom_smmu(smmu_domain->smmu); + + if (enabled) + qsmmu->stall_enabled |= BIT(cfg->cbndx); + else + qsmmu->stall_enabled &= ~BIT(cfg->cbndx); +} + +static void qcom_adreno_smmu_resume_translation(const void *cookie, bool terminate) +{ + struct arm_smmu_domain *smmu_domain = (void *)cookie; + struct arm_smmu_cfg *cfg = &smmu_domain->cfg; + struct arm_smmu_device *smmu = smmu_domain->smmu; + u32 reg = 0; + + if (terminate) + reg |= ARM_SMMU_RESUME_TERMINATE; + + arm_smmu_cb_write(smmu, cfg->cbndx, ARM_SMMU_CB_RESUME, reg); +} + +#define QCOM_ADRENO_SMMU_GPU_SID 0 + +static bool qcom_adreno_smmu_is_gpu_device(struct device *dev) +{ + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); + int i; + + /* + * The GPU will always use SID 0 so that is a handy way to uniquely + * identify it and configure it for per-instance pagetables + */ + for (i = 0; i < fwspec->num_ids; i++) { + u16 sid = FIELD_GET(ARM_SMMU_SMR_ID, fwspec->ids[i]); + + if (sid == QCOM_ADRENO_SMMU_GPU_SID) + return true; + } + + return false; +} + +static const struct io_pgtable_cfg *qcom_adreno_smmu_get_ttbr1_cfg( + const void *cookie) +{ + struct arm_smmu_domain *smmu_domain = (void *)cookie; + struct io_pgtable *pgtable = + io_pgtable_ops_to_pgtable(smmu_domain->pgtbl_ops); + return &pgtable->cfg; +} + +/* + * Local implementation to configure TTBR0 with the specified pagetable config. + * The GPU driver will call this to enable TTBR0 when per-instance pagetables + * are active + */ + +static int qcom_adreno_smmu_set_ttbr0_cfg(const void *cookie, + const struct io_pgtable_cfg *pgtbl_cfg) +{ + struct arm_smmu_domain *smmu_domain = (void *)cookie; + struct io_pgtable *pgtable = io_pgtable_ops_to_pgtable(smmu_domain->pgtbl_ops); + struct arm_smmu_cfg *cfg = &smmu_domain->cfg; + struct arm_smmu_cb *cb = &smmu_domain->smmu->cbs[cfg->cbndx]; + + /* The domain must have split pagetables already enabled */ + if (cb->tcr[0] & ARM_SMMU_TCR_EPD1) + return -EINVAL; + + /* If the pagetable config is NULL, disable TTBR0 */ + if (!pgtbl_cfg) { + /* Do nothing if it is already disabled */ + if ((cb->tcr[0] & ARM_SMMU_TCR_EPD0)) + return -EINVAL; + + /* Set TCR to the original configuration */ + cb->tcr[0] = arm_smmu_lpae_tcr(&pgtable->cfg); + cb->ttbr[0] = FIELD_PREP(ARM_SMMU_TTBRn_ASID, cb->cfg->asid); + } else { + u32 tcr = cb->tcr[0]; + + /* Don't call this again if TTBR0 is already enabled */ + if (!(cb->tcr[0] & ARM_SMMU_TCR_EPD0)) + return -EINVAL; + + tcr |= arm_smmu_lpae_tcr(pgtbl_cfg); + tcr &= ~(ARM_SMMU_TCR_EPD0 | ARM_SMMU_TCR_EPD1); + + cb->tcr[0] = tcr; + cb->ttbr[0] = pgtbl_cfg->arm_lpae_s1_cfg.ttbr; + cb->ttbr[0] |= FIELD_PREP(ARM_SMMU_TTBRn_ASID, cb->cfg->asid); + } + + arm_smmu_write_context_bank(smmu_domain->smmu, cb->cfg->cbndx); + + return 0; +} + +static int qcom_adreno_smmu_alloc_context_bank(struct arm_smmu_domain *smmu_domain, + struct arm_smmu_device *smmu, + struct device *dev, int start) +{ + int count; + + /* + * Assign context bank 0 to the GPU device so the GPU hardware can + * switch pagetables + */ + if (qcom_adreno_smmu_is_gpu_device(dev)) { + start = 0; + count = 1; + } else { + start = 1; + count = smmu->num_context_banks; + } + + return __arm_smmu_alloc_bitmap(smmu->context_map, start, count); +} + +static bool qcom_adreno_can_do_ttbr1(struct arm_smmu_device *smmu) +{ + const struct device_node *np = smmu->dev->of_node; + + if (of_device_is_compatible(np, "qcom,msm8996-smmu-v2")) + return false; + + return true; +} + +static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain, + struct io_pgtable_cfg *pgtbl_cfg, struct device *dev) +{ + struct adreno_smmu_priv *priv; + + smmu_domain->cfg.flush_walk_prefer_tlbiasid = true; + + /* Only enable split pagetables for the GPU device (SID 0) */ + if (!qcom_adreno_smmu_is_gpu_device(dev)) + return 0; + + /* + * All targets that use the qcom,adreno-smmu compatible string *should* + * be AARCH64 stage 1 but double check because the arm-smmu code assumes + * that is the case when the TTBR1 quirk is enabled + */ + if (qcom_adreno_can_do_ttbr1(smmu_domain->smmu) && + (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) && + (smmu_domain->cfg.fmt == ARM_SMMU_CTX_FMT_AARCH64)) + pgtbl_cfg->quirks |= IO_PGTABLE_QUIRK_ARM_TTBR1; + + /* + * Initialize private interface with GPU: + */ + + priv = dev_get_drvdata(dev); + priv->cookie = smmu_domain; + priv->get_ttbr1_cfg = qcom_adreno_smmu_get_ttbr1_cfg; + priv->set_ttbr0_cfg = qcom_adreno_smmu_set_ttbr0_cfg; + priv->get_fault_info = qcom_adreno_smmu_get_fault_info; + priv->set_stall = qcom_adreno_smmu_set_stall; + priv->resume_translation = qcom_adreno_smmu_resume_translation; + + return 0; +} + +static const struct of_device_id qcom_smmu_client_of_match[] __maybe_unused = { + { .compatible = "qcom,adreno" }, + { .compatible = "qcom,adreno-gmu" }, + { .compatible = "qcom,mdp4" }, + { .compatible = "qcom,mdss" }, + { .compatible = "qcom,sc7180-mdss" }, + { .compatible = "qcom,sc7180-mss-pil" }, + { .compatible = "qcom,sc7280-mdss" }, + { .compatible = "qcom,sc7280-mss-pil" }, + { .compatible = "qcom,sc8180x-mdss" }, + { .compatible = "qcom,sm8250-mdss" }, + { .compatible = "qcom,sdm845-mdss" }, + { .compatible = "qcom,sdm845-mss-pil" }, + { } +}; + +static int qcom_smmu_init_context(struct arm_smmu_domain *smmu_domain, + struct io_pgtable_cfg *pgtbl_cfg, struct device *dev) +{ + smmu_domain->cfg.flush_walk_prefer_tlbiasid = true; + + return 0; +} + +static int qcom_smmu_cfg_probe(struct arm_smmu_device *smmu) +{ + unsigned int last_s2cr = ARM_SMMU_GR0_S2CR(smmu->num_mapping_groups - 1); + struct qcom_smmu *qsmmu = to_qcom_smmu(smmu); + u32 reg; + u32 smr; + int i; + + /* + * With some firmware versions writes to S2CR of type FAULT are + * ignored, and writing BYPASS will end up written as FAULT in the + * register. Perform a write to S2CR to detect if this is the case and + * if so reserve a context bank to emulate bypass streams. + */ + reg = FIELD_PREP(ARM_SMMU_S2CR_TYPE, S2CR_TYPE_BYPASS) | + FIELD_PREP(ARM_SMMU_S2CR_CBNDX, 0xff) | + FIELD_PREP(ARM_SMMU_S2CR_PRIVCFG, S2CR_PRIVCFG_DEFAULT); + arm_smmu_gr0_write(smmu, last_s2cr, reg); + reg = arm_smmu_gr0_read(smmu, last_s2cr); + if (FIELD_GET(ARM_SMMU_S2CR_TYPE, reg) != S2CR_TYPE_BYPASS) { + qsmmu->bypass_quirk = true; + qsmmu->bypass_cbndx = smmu->num_context_banks - 1; + + set_bit(qsmmu->bypass_cbndx, smmu->context_map); + + arm_smmu_cb_write(smmu, qsmmu->bypass_cbndx, ARM_SMMU_CB_SCTLR, 0); + + reg = FIELD_PREP(ARM_SMMU_CBAR_TYPE, CBAR_TYPE_S1_TRANS_S2_BYPASS); + arm_smmu_gr1_write(smmu, ARM_SMMU_GR1_CBAR(qsmmu->bypass_cbndx), reg); + } + + for (i = 0; i < smmu->num_mapping_groups; i++) { + smr = arm_smmu_gr0_read(smmu, ARM_SMMU_GR0_SMR(i)); + + if (FIELD_GET(ARM_SMMU_SMR_VALID, smr)) { + /* Ignore valid bit for SMR mask extraction. */ + smr &= ~ARM_SMMU_SMR_VALID; + smmu->smrs[i].id = FIELD_GET(ARM_SMMU_SMR_ID, smr); + smmu->smrs[i].mask = FIELD_GET(ARM_SMMU_SMR_MASK, smr); + smmu->smrs[i].valid = true; + + smmu->s2crs[i].type = S2CR_TYPE_BYPASS; + smmu->s2crs[i].privcfg = S2CR_PRIVCFG_DEFAULT; + smmu->s2crs[i].cbndx = 0xff; + } + } + + return 0; +} + +static void qcom_smmu_write_s2cr(struct arm_smmu_device *smmu, int idx) +{ + struct arm_smmu_s2cr *s2cr = smmu->s2crs + idx; + struct qcom_smmu *qsmmu = to_qcom_smmu(smmu); + u32 cbndx = s2cr->cbndx; + u32 type = s2cr->type; + u32 reg; + + if (qsmmu->bypass_quirk) { + if (type == S2CR_TYPE_BYPASS) { + /* + * Firmware with quirky S2CR handling will substitute + * BYPASS writes with FAULT, so point the stream to the + * reserved context bank and ask for translation on the + * stream + */ + type = S2CR_TYPE_TRANS; + cbndx = qsmmu->bypass_cbndx; + } else if (type == S2CR_TYPE_FAULT) { + /* + * Firmware with quirky S2CR handling will ignore FAULT + * writes, so trick it to write FAULT by asking for a + * BYPASS. + */ + type = S2CR_TYPE_BYPASS; + cbndx = 0xff; + } + } + + reg = FIELD_PREP(ARM_SMMU_S2CR_TYPE, type) | + FIELD_PREP(ARM_SMMU_S2CR_CBNDX, cbndx) | + FIELD_PREP(ARM_SMMU_S2CR_PRIVCFG, s2cr->privcfg); + arm_smmu_gr0_write(smmu, ARM_SMMU_GR0_S2CR(idx), reg); +} + +static int qcom_smmu_def_domain_type(struct device *dev) +{ + const struct of_device_id *match = + of_match_device(qcom_smmu_client_of_match, dev); + + return match ? IOMMU_DOMAIN_IDENTITY : 0; +} + +static int qcom_sdm845_smmu500_reset(struct arm_smmu_device *smmu) +{ + int ret; + + /* + * To address performance degradation in non-real time clients, + * such as USB and UFS, turn off wait-for-safe on sdm845 based boards, + * such as MTP and db845, whose firmwares implement secure monitor + * call handlers to turn on/off the wait-for-safe logic. + */ + ret = qcom_scm_qsmmu500_wait_safe_toggle(0); + if (ret) + dev_warn(smmu->dev, "Failed to turn off SAFE logic\n"); + + return ret; +} + +static int qcom_smmu500_reset(struct arm_smmu_device *smmu) +{ + const struct device_node *np = smmu->dev->of_node; + + arm_mmu500_reset(smmu); + + if (of_device_is_compatible(np, "qcom,sdm845-smmu-500")) + return qcom_sdm845_smmu500_reset(smmu); + + return 0; +} + +static const struct arm_smmu_impl qcom_smmu_impl = { + .init_context = qcom_smmu_init_context, + .cfg_probe = qcom_smmu_cfg_probe, + .def_domain_type = qcom_smmu_def_domain_type, + .reset = qcom_smmu500_reset, + .write_s2cr = qcom_smmu_write_s2cr, + .tlb_sync = qcom_smmu_tlb_sync, +}; + +static const struct arm_smmu_impl qcom_adreno_smmu_impl = { + .init_context = qcom_adreno_smmu_init_context, + .def_domain_type = qcom_smmu_def_domain_type, + .reset = qcom_smmu500_reset, + .alloc_context_bank = qcom_adreno_smmu_alloc_context_bank, + .write_sctlr = qcom_adreno_smmu_write_sctlr, + .tlb_sync = qcom_smmu_tlb_sync, +}; + +static struct arm_smmu_device *qcom_smmu_create(struct arm_smmu_device *smmu, + const struct arm_smmu_impl *impl) +{ + struct qcom_smmu *qsmmu; + + /* Check to make sure qcom_scm has finished probing */ + if (!qcom_scm_is_available()) + return ERR_PTR(-EPROBE_DEFER); + + qsmmu = devm_krealloc(smmu->dev, smmu, sizeof(*qsmmu), GFP_KERNEL); + if (!qsmmu) + return ERR_PTR(-ENOMEM); + + qsmmu->smmu.impl = impl; + qsmmu->cfg = qcom_smmu_impl_data(smmu); + + return &qsmmu->smmu; +} + +static const struct of_device_id __maybe_unused qcom_smmu_impl_of_match[] = { + { .compatible = "qcom,msm8998-smmu-v2" }, + { .compatible = "qcom,qcm2290-smmu-500" }, + { .compatible = "qcom,sc7180-smmu-500" }, + { .compatible = "qcom,sc7280-smmu-500" }, + { .compatible = "qcom,sc8180x-smmu-500" }, + { .compatible = "qcom,sc8280xp-smmu-500" }, + { .compatible = "qcom,sdm630-smmu-v2" }, + { .compatible = "qcom,sdm845-smmu-500" }, + { .compatible = "qcom,sm6125-smmu-500" }, + { .compatible = "qcom,sm6350-smmu-500" }, + { .compatible = "qcom,sm6375-smmu-500" }, + { .compatible = "qcom,sm8150-smmu-500" }, + { .compatible = "qcom,sm8250-smmu-500" }, + { .compatible = "qcom,sm8350-smmu-500" }, + { .compatible = "qcom,sm8450-smmu-500" }, + { } +}; + +#ifdef CONFIG_ACPI +static struct acpi_platform_list qcom_acpi_platlist[] = { + { "LENOVO", "CB-01 ", 0x8180, ACPI_SIG_IORT, equal, "QCOM SMMU" }, + { "QCOM ", "QCOMEDK2", 0x8180, ACPI_SIG_IORT, equal, "QCOM SMMU" }, + { } +}; +#endif + +struct arm_smmu_device *qcom_smmu_impl_init(struct arm_smmu_device *smmu) +{ + const struct device_node *np = smmu->dev->of_node; + +#ifdef CONFIG_ACPI + if (np == NULL) { + /* Match platform for ACPI boot */ + if (acpi_match_platform_list(qcom_acpi_platlist) >= 0) + return qcom_smmu_create(smmu, &qcom_smmu_impl); + } +#endif + + /* + * Do not change this order of implementation, i.e., first adreno + * smmu impl and then apss smmu since we can have both implementing + * arm,mmu-500 in which case we will miss setting adreno smmu specific + * features if the order is changed. + */ + if (of_device_is_compatible(np, "qcom,adreno-smmu")) + return qcom_smmu_create(smmu, &qcom_adreno_smmu_impl); + + if (of_match_node(qcom_smmu_impl_of_match, np)) + return qcom_smmu_create(smmu, &qcom_smmu_impl); + + return smmu; +} |