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Fri, 1 Mar 2019 19:38:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1551469129; bh=vtUz/70hS+YlPCP+DnDk5nDj0CmNlWrNaq3raVA+i8s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lEuGW7wu7BqP8FrW5iTzDW4Alv3uOFxfNDgQCT7ilgx+mmdBDx0434MoRUYYjtzNN 2HvaFNt5z9WcRtGuBUTAzhZbVIFU90kJIgkP7bV0m/Wnx+DhXUIdTRVmAYFNgkMAN0 b/sdzrl8XMXsW4p4Ytu2JRhONhp/DKAsoqAP4xDA= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org A573B61340 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=jcrouse@codeaurora.org From: Jordan Crouse To: freedreno@lists.freedesktop.org Subject: [RFC PATCH v1 05/15] iommu/arm-smmu: Add auxiliary domain support for arm-smmuv2 Date: Fri, 1 Mar 2019 12:38:27 -0700 Message-Id: <1551469117-3404-6-git-send-email-jcrouse@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1551469117-3404-1-git-send-email-jcrouse@codeaurora.org> References: <1551469117-3404-1-git-send-email-jcrouse@codeaurora.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190301_113851_930838_C6E0C2E7 X-CRM114-Status: GOOD ( 25.19 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jean-philippe.brucker@arm.com, linux-arm-msm@vger.kernel.org, Joerg Roedel , Will Deacon , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, dianders@chromimum.org, hoegsberg@google.com, Robin Murphy , linux-arm-kernel@lists.infradead.org, baolu.lu@linux.intel.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Support the new auxiliary domain API for arm-smmuv2 to initialize and support multiple pagetables for a SMMU device. Since the smmu-v2 hardware doesn't have any built in support for switching the pagetable base it is left as an exercise to the caller to actually use the pagetable; aux domains in the IOMMU driver are only preoccupied with creating and managing the pagetable memory. Following is a pseudo code example of how a domain can be created /* Check to see if aux domains are supported */ if (iommu_dev_has_feature(dev, IOMMU_DEV_FEAT_AUX)) { iommu = iommu_domain_alloc(...); if (iommu_aux_attach_device(domain, dev)) return FAIL; /* Save the base address of the pagetable for use by the driver iommu_domain_get_attr(domain, DOMAIN_ATTR_PTBASE, &ptbase); } After this 'domain' can be used like any other iommu domain to map and unmap iova addresses in the pagetable. The driver/hardware can be used to switch the pagetable according to its own specific implementation. Signed-off-by: Jordan Crouse --- drivers/iommu/arm-smmu.c | 135 ++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 111 insertions(+), 24 deletions(-) diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 05eb126..b7b508e 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -263,6 +263,8 @@ struct arm_smmu_domain { spinlock_t cb_lock; /* Serialises ATS1* ops and TLB syncs */ u32 attributes; struct iommu_domain domain; + bool is_aux; + u64 ttbr0; }; struct arm_smmu_option_prop { @@ -874,6 +876,12 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain, if (!(smmu->features & ARM_SMMU_FEAT_TRANS_S2)) smmu_domain->stage = ARM_SMMU_DOMAIN_S1; + /* Aux domains can only be created for stage-1 tables */ + if (smmu_domain->is_aux && smmu_domain->stage != ARM_SMMU_DOMAIN_S1) { + ret = -EINVAL; + goto out_unlock; + } + /* * Choosing a suitable context format is even more fiddly. Until we * grow some way for the caller to express a preference, and/or move @@ -920,7 +928,10 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain, ias = min(ias, 32UL); oas = min(oas, 32UL); } - smmu_domain->tlb_ops = &arm_smmu_s1_tlb_ops; + + /* aux domains shouldn't touch hardware so no TLB ops */ + if (!smmu_domain->is_aux) + smmu_domain->tlb_ops = &arm_smmu_s1_tlb_ops; break; case ARM_SMMU_DOMAIN_NESTED: /* @@ -939,32 +950,42 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain, ias = min(ias, 40UL); oas = min(oas, 40UL); } - if (smmu->version == ARM_SMMU_V2) - smmu_domain->tlb_ops = &arm_smmu_s2_tlb_ops_v2; - else - smmu_domain->tlb_ops = &arm_smmu_s2_tlb_ops_v1; + + if (!smmu_domain->is_aux) { + if (smmu->version == ARM_SMMU_V2) + smmu_domain->tlb_ops = &arm_smmu_s2_tlb_ops_v2; + else + smmu_domain->tlb_ops = &arm_smmu_s2_tlb_ops_v1; + } break; default: ret = -EINVAL; goto out_unlock; } - ret = __arm_smmu_alloc_bitmap(smmu->context_map, start, - smmu->num_context_banks); - if (ret < 0) - goto out_unlock; - cfg->cbndx = ret; - if (smmu->version < ARM_SMMU_V2) { - cfg->irptndx = atomic_inc_return(&smmu->irptndx); - cfg->irptndx %= smmu->num_context_irqs; - } else { - cfg->irptndx = cfg->cbndx; - } + /* + * Aux domains will use the same context bank assigned to the master + * domain for the device + */ + if (!smmu_domain->is_aux) { + ret = __arm_smmu_alloc_bitmap(smmu->context_map, start, + smmu->num_context_banks); + if (ret < 0) + goto out_unlock; - if (smmu_domain->stage == ARM_SMMU_DOMAIN_S2) - cfg->vmid = cfg->cbndx + 1 + smmu->cavium_id_base; - else - cfg->asid = cfg->cbndx + smmu->cavium_id_base; + cfg->cbndx = ret; + if (smmu->version < ARM_SMMU_V2) { + cfg->irptndx = atomic_inc_return(&smmu->irptndx); + cfg->irptndx %= smmu->num_context_irqs; + } else { + cfg->irptndx = cfg->cbndx; + } + + if (smmu_domain->stage == ARM_SMMU_DOMAIN_S2) + cfg->vmid = cfg->cbndx + 1 + smmu->cavium_id_base; + else + cfg->asid = cfg->cbndx + smmu->cavium_id_base; + } pgtbl_cfg = (struct io_pgtable_cfg) { .pgsize_bitmap = smmu->pgsize_bitmap, @@ -987,16 +1008,26 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain, goto out_clear_smmu; } + /* Cache the TTBR0 for the aux domain */ + smmu_domain->ttbr0 = pgtbl_cfg.arm_lpae_s1_cfg.ttbr[0]; + /* Update the domain's page sizes to reflect the page table format */ domain->pgsize_bitmap = pgtbl_cfg.pgsize_bitmap; domain->geometry.aperture_end = (1UL << ias) - 1; domain->geometry.force_aperture = true; + pgtbl_ops[1] = NULL; + + /* + * aux domains don't use split tables or program the hardware so we're + * done setting it up + */ + if (smmu_domain->is_aux) + goto end; + /* Initialise the context bank with our page table cfg */ arm_smmu_init_context_bank(smmu_domain, &pgtbl_cfg); - pgtbl_ops[1] = NULL; - if (split_tables) { /* FIXME: I think it is safe to reuse pgtbl_cfg here */ pgtbl_ops[1] = alloc_io_pgtable_ops(fmt, &pgtbl_cfg, @@ -1018,13 +1049,15 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain, */ irq = smmu->irqs[smmu->num_global_irqs + cfg->irptndx]; ret = devm_request_irq(smmu->dev, irq, arm_smmu_context_fault, - IRQF_SHARED, "arm-smmu-context-fault", domain); + IRQF_SHARED, "arm-smmu-context-fault", + domain); if (ret < 0) { dev_err(smmu->dev, "failed to request context IRQ %d (%u)\n", cfg->irptndx, irq); cfg->irptndx = INVALID_IRPTNDX; } +end: mutex_unlock(&smmu_domain->init_mutex); /* Publish page table ops for map/unmap */ @@ -1050,6 +1083,12 @@ static void arm_smmu_destroy_domain_context(struct iommu_domain *domain) if (!smmu || domain->type == IOMMU_DOMAIN_IDENTITY) return; + /* All we need to do for aux devices is destroy the pagetable */ + if (smmu_domain->is_aux) { + free_io_pgtable_ops(smmu_domain->pgtbl_ops[0]); + return; + } + ret = arm_smmu_rpm_get(smmu); if (ret < 0) return; @@ -1330,6 +1369,39 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain, return 0; } +static bool arm_smmu_dev_has_feat(struct device *dev, + enum iommu_dev_features feat) +{ + /* + * FIXME: Should we do some hardware checking here, like to be sure this + * is a stage 1 and such? + */ + + /* Always allow aux domains */ + if (feat == IOMMU_DEV_FEAT_AUX) + return true; + + return false; +} + +/* FIXME: Add stubs for dev_enable_feat and dev_disable_feat? */ + +/* Set up a new aux domain and create a new pagetable with the same + * characteristics as the master + */ +static int arm_smmu_aux_attach_dev(struct iommu_domain *domain, + struct device *dev) +{ + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); + struct arm_smmu_device *smmu = fwspec_smmu(fwspec); + struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain); + + smmu_domain->is_aux = true; + + /* No power is needed because aux domain doesn't touch the hardware */ + return arm_smmu_init_domain_context(domain, smmu); +} + static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) { int ret; @@ -1342,6 +1414,8 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) return -ENXIO; } + /* FIXME: Reject unmanged domains since those should be aux? */ + /* * FIXME: The arch/arm DMA API code tries to attach devices to its own * domains between of_xlate() and add_device() - we have no way to cope @@ -1388,7 +1462,13 @@ arm_smmu_get_pgtbl_ops(struct iommu_domain *domain, unsigned long iova) { struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain); struct arm_smmu_cfg *cfg = &smmu_domain->cfg; - struct arm_smmu_cb *cb = &smmu_domain->smmu->cbs[cfg->cbndx]; + struct arm_smmu_cb *cb; + + /* quick escape for domains that don't have split pagetables enabled */ + if (!smmu_domain->pgtbl_ops[1]) + return smmu_domain->pgtbl_ops[0]; + + cb = &smmu_domain->smmu->cbs[cfg->cbndx]; if (iova & cb->split_table_mask) return smmu_domain->pgtbl_ops[1]; @@ -1700,6 +1780,11 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain, !!(smmu_domain->attributes & (1 << DOMAIN_ATTR_SPLIT_TABLES)); return 0; + case DOMAIN_ATTR_PTBASE: + if (!smmu_domain->is_aux) + return -ENODEV; + *((u64 *)data) = smmu_domain->ttbr0; + return 0; default: return -ENODEV; } @@ -1810,7 +1895,9 @@ static struct iommu_ops arm_smmu_ops = { .capable = arm_smmu_capable, .domain_alloc = arm_smmu_domain_alloc, .domain_free = arm_smmu_domain_free, + .dev_has_feat = arm_smmu_dev_has_feat, .attach_dev = arm_smmu_attach_dev, + .aux_attach_dev = arm_smmu_aux_attach_dev, .map = arm_smmu_map, .unmap = arm_smmu_unmap, .flush_iotlb_all = arm_smmu_flush_iotlb_all,