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Mon, 27 May 2024 05:56:47 -0700 (PDT) From: Bartosz Golaszewski Date: Mon, 27 May 2024 14:54:53 +0200 Subject: [PATCH v10 03/15] firmware: qcom: scm: enable the TZ mem allocator Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240527-shm-bridge-v10-3-ce7afaa58d3a@linaro.org> References: <20240527-shm-bridge-v10-0-ce7afaa58d3a@linaro.org> In-Reply-To: <20240527-shm-bridge-v10-0-ce7afaa58d3a@linaro.org> To: Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Robert Marko , Das Srinagesh , Bartosz Golaszewski , Maximilian Luz , Catalin Marinas , Will Deacon , Srini Kandagatla , Arnd Bergmann , Elliot Berman , Alex Elder Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kernel@quicinc.com, Andrew Halaney , Deepti Jaggi X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3441; 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a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski Select the TrustZone memory allocator in Kconfig and create a pool of memory shareable with the TrustZone when probing the SCM driver. This will allow a gradual conversion of all relevant SCM calls to using the dedicated allocator. The policy used for the pool is "on-demand" and the initial size is 0 as - depending on the config - it's possible that no SCM calls needing to allocate memory will be called. The sizes of possible allocations also vary substiantially further warranting the "on-demand" approach. Signed-off-by: Bartosz Golaszewski Reviewed-by: Andrew Halaney Tested-by: Andrew Halaney # sc8280xp-lenovo-thinkpad-x13s Tested-by: Deepti Jaggi #sa8775p-ride Reviewed-by: Elliot Berman --- drivers/firmware/qcom/Kconfig | 1 + drivers/firmware/qcom/qcom_scm.c | 22 ++++++++++++++++++++++ 2 files changed, 23 insertions(+) diff --git a/drivers/firmware/qcom/Kconfig b/drivers/firmware/qcom/Kconfig index 3c495f8698e1..4634f8cecc7b 100644 --- a/drivers/firmware/qcom/Kconfig +++ b/drivers/firmware/qcom/Kconfig @@ -7,6 +7,7 @@ menu "Qualcomm firmware drivers" config QCOM_SCM + select QCOM_TZMEM tristate config QCOM_TZMEM diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c index 68f4df7e6c3c..0e7b1813e4a7 100644 --- a/drivers/firmware/qcom/qcom_scm.c +++ b/drivers/firmware/qcom/qcom_scm.c @@ -10,8 +10,10 @@ #include #include #include +#include #include #include +#include #include #include #include @@ -22,9 +24,11 @@ #include #include #include +#include #include #include "qcom_scm.h" +#include "qcom_tzmem.h" static bool download_mode = IS_ENABLED(CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT); module_param(download_mode, bool, 0); @@ -43,6 +47,8 @@ struct qcom_scm { int scm_vote_count; u64 dload_mode_addr; + + struct qcom_tzmem_pool *mempool; }; struct qcom_scm_current_perm_info { @@ -1810,6 +1816,7 @@ static irqreturn_t qcom_scm_irq_handler(int irq, void *data) static int qcom_scm_probe(struct platform_device *pdev) { + struct qcom_tzmem_pool_config pool_config; struct qcom_scm *scm; int irq, ret; @@ -1885,6 +1892,21 @@ static int qcom_scm_probe(struct platform_device *pdev) if (of_property_read_bool(pdev->dev.of_node, "qcom,sdi-enabled")) qcom_scm_disable_sdi(); + ret = qcom_tzmem_enable(__scm->dev); + if (ret) + return dev_err_probe(__scm->dev, ret, + "Failed to enable the TrustZone memory allocator\n"); + + memset(&pool_config, 0, sizeof(pool_config)); + pool_config.initial_size = 0; + pool_config.policy = QCOM_TZMEM_POLICY_ON_DEMAND; + pool_config.max_size = SZ_256K; + + __scm->mempool = devm_qcom_tzmem_pool_new(__scm->dev, &pool_config); + if (IS_ERR(__scm->mempool)) + return dev_err_probe(__scm->dev, PTR_ERR(__scm->mempool), + "Failed to create the SCM memory pool\n"); + /* * Initialize the QSEECOM interface. *