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dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=vivek.gautam@codeaurora.org From: Vivek Gautam To: will.deacon@arm.com, robin.murphy@arm.com, joro@8bytes.org, iommu@lists.linux-foundation.org Subject: [PATCH 2/2] iommu/arm-smmu: Add support for non-coherent page table mappings Date: Thu, 17 Jan 2019 14:57:18 +0530 Message-Id: <20190117092718.1396-3-vivek.gautam@codeaurora.org> X-Mailer: git-send-email 2.16.1.72.g5be1f00a9a70 In-Reply-To: <20190117092718.1396-1-vivek.gautam@codeaurora.org> References: <20190117092718.1396-1-vivek.gautam@codeaurora.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190117_012740_227624_D1D365B6 X-CRM114-Status: GOOD ( 12.65 ) 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: Vivek Gautam , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, tfiga@chromium.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Adding a device tree option for arm smmu to enable non-cacheable memory for page tables. We already enable a smmu feature for coherent walk based on whether the smmu device is dma-coherent or not. Have an option to enable non-cacheable page table memory to force set it for particular smmu devices. Signed-off-by: Vivek Gautam --- drivers/iommu/arm-smmu.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index af18a7e7f917..7ebbcf1b2eb3 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -188,6 +188,7 @@ struct arm_smmu_device { u32 features; #define ARM_SMMU_OPT_SECURE_CFG_ACCESS (1 << 0) +#define ARM_SMMU_OPT_PGTBL_NON_COHERENT (1 << 1) u32 options; enum arm_smmu_arch_version version; enum arm_smmu_implementation model; @@ -273,6 +274,7 @@ static bool using_legacy_binding, using_generic_binding; static struct arm_smmu_option_prop arm_smmu_options[] = { { ARM_SMMU_OPT_SECURE_CFG_ACCESS, "calxeda,smmu-secure-config-access" }, + { ARM_SMMU_OPT_PGTBL_NON_COHERENT, "arm,smmu-pgtable-non-coherent" }, { 0, NULL}, }; @@ -902,6 +904,11 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain, if (smmu_domain->non_strict) pgtbl_cfg.quirks |= IO_PGTABLE_QUIRK_NON_STRICT; + /* Non coherent page table mappings only for Stage-1 */ + if (smmu->options & ARM_SMMU_OPT_PGTBL_NON_COHERENT && + smmu_domain->stage == ARM_SMMU_DOMAIN_S1) + pgtbl_cfg.quirks |= IO_PGTABLE_QUIRK_NON_COHERENT; + smmu_domain->smmu = smmu; pgtbl_ops = alloc_io_pgtable_ops(fmt, &pgtbl_cfg, smmu_domain); if (!pgtbl_ops) { -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel