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spf=none smtp.mailfrom=saiprakash.ranjan@codeaurora.org From: Sai Prakash Ranjan To: Will Deacon , Robin Murphy , Joerg Roedel , Jordan Crouse , Rob Clark Subject: [PATCH 2/2] iommu/arm-smmu: Allow client devices to select direct mapping Date: Wed, 22 Jan 2020 17:18:02 +0530 Message-Id: <813cc5b2da10c27db982254b274bf26008a9e6da.1579692800.git.saiprakash.ranjan@codeaurora.org> X-Mailer: git-send-email 2.24.0 In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200122_034832_462216_DDBB0375 X-CRM114-Status: GOOD ( 15.48 ) X-Spam-Score: 0.0 (/) X-Spam-Report: SpamAssassin version 3.4.3 on bombadil.infradead.org summary: Content analysis details: (0.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [104.130.122.25 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sai Prakash Ranjan , Tomasz Figa , Rajendra Nayak , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Stephen Boyd , iommu@lists.linux-foundation.org, Matthias Kaehlcke , Bjorn Andersson , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Jordan Crouse Some client devices want to directly map the IOMMU themselves instead of using the DMA domain. Allow those devices to opt in to direct mapping by way of a list of compatible strings. Signed-off-by: Jordan Crouse Co-developed-by: Sai Prakash Ranjan Signed-off-by: Sai Prakash Ranjan --- drivers/iommu/arm-smmu-qcom.c | 39 +++++++++++++++++++++++++++++++++++ drivers/iommu/arm-smmu.c | 3 +++ drivers/iommu/arm-smmu.h | 5 +++++ 3 files changed, 47 insertions(+) diff --git a/drivers/iommu/arm-smmu-qcom.c b/drivers/iommu/arm-smmu-qcom.c index 64a4ab270ab7..ff746acd1c81 100644 --- a/drivers/iommu/arm-smmu-qcom.c +++ b/drivers/iommu/arm-smmu-qcom.c @@ -3,6 +3,7 @@ * Copyright (c) 2019, The Linux Foundation. All rights reserved. */ +#include #include #include "arm-smmu.h" @@ -11,6 +12,43 @@ struct qcom_smmu { struct arm_smmu_device smmu; }; +static const struct arm_smmu_client_match_data qcom_adreno = { + .direct_mapping = true, +}; + +static const struct arm_smmu_client_match_data qcom_mdss = { + .direct_mapping = true, +}; + +static const struct of_device_id qcom_smmu_client_of_match[] = { + { .compatible = "qcom,adreno", .data = &qcom_adreno }, + { .compatible = "qcom,mdp4", .data = &qcom_mdss }, + { .compatible = "qcom,mdss", .data = &qcom_mdss }, + { .compatible = "qcom,sc7180-mdss", .data = &qcom_mdss }, + { .compatible = "qcom,sdm845-mdss", .data = &qcom_mdss }, + {}, +}; + +static const struct arm_smmu_client_match_data * +qcom_smmu_client_data(struct device *dev) +{ + const struct of_device_id *match = + of_match_device(qcom_smmu_client_of_match, dev); + + return match ? match->data : NULL; +} + +static int qcom_smmu_request_domain(struct device *dev) +{ + const struct arm_smmu_client_match_data *client; + + client = qcom_smmu_client_data(dev); + if (client) + iommu_request_dm_for_dev(dev); + + return 0; +} + static int qcom_sdm845_smmu500_reset(struct arm_smmu_device *smmu) { int ret; @@ -41,6 +79,7 @@ static int qcom_smmu500_reset(struct arm_smmu_device *smmu) } static const struct arm_smmu_impl qcom_smmu_impl = { + .req_domain = qcom_smmu_request_domain, .reset = qcom_smmu500_reset, }; diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 16c4b87af42b..67dd9326247a 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -1448,6 +1448,9 @@ static int arm_smmu_add_device(struct device *dev) device_link_add(dev, smmu->dev, DL_FLAG_PM_RUNTIME | DL_FLAG_AUTOREMOVE_SUPPLIER); + if (smmu->impl && smmu->impl->req_domain) + return smmu->impl->req_domain(dev); + return 0; out_cfg_free: diff --git a/drivers/iommu/arm-smmu.h b/drivers/iommu/arm-smmu.h index 8d1cd54d82a6..059dc9c39f64 100644 --- a/drivers/iommu/arm-smmu.h +++ b/drivers/iommu/arm-smmu.h @@ -244,6 +244,10 @@ enum arm_smmu_arch_version { ARM_SMMU_V2, }; +struct arm_smmu_client_match_data { + bool direct_mapping; +}; + enum arm_smmu_implementation { GENERIC_SMMU, ARM_MMU500, @@ -386,6 +390,7 @@ struct arm_smmu_impl { int (*init_context)(struct arm_smmu_domain *smmu_domain); void (*tlb_sync)(struct arm_smmu_device *smmu, int page, int sync, int status); + int (*req_domain)(struct device *dev); }; static inline void __iomem *arm_smmu_page(struct arm_smmu_device *smmu, int n)