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Tue, 19 Nov 2024 10:33:35 -0800 (PST) Received: from [127.0.1.1] ([178.197.211.167]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-432dac1fb7asm201566805e9.42.2024.11.19.10.33.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Nov 2024 10:33:34 -0800 (PST) From: Krzysztof Kozlowski Subject: [PATCH 0/6] firmware: qcom: scm: Fixes for concurrency Date: Tue, 19 Nov 2024 19:33:16 +0100 Message-Id: <20241119-qcom-scm-missing-barriers-and-all-sort-of-srap-v1-0-7056127007a7@linaro.org> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAOzZPGcC/x3NQQqDMBBG4avIrPuDCUq1VyldTE20AyaxM1IK4 t0bunyb7x1kUSUa3ZqDNH7EpOQa7tLQ9OK8REioTb71nXNuxHsqCTYlJDGTvODJWgU1cA7gdYU V3VFmmPIG9n3ox/baDYOnim4aZ/n+h/fHef4AcxNUboAAAAA= X-Change-ID: 20241119-qcom-scm-missing-barriers-and-all-sort-of-srap-a25d59074882 To: Bjorn Andersson , Konrad Dybcio , Mukesh Ojha , Dmitry Baryshkov , Stephan Gerhold , Bartosz Golaszewski , Kuldeep Singh , Elliot Berman , Andrew Halaney , Avaneesh Kumar Dwivedi , Andy Gross Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Krzysztof Kozlowski X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; 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a=openpgp; fpr=9BD07E0E0C51F8D59677B7541B93437D3B41629B SCM driver looks messy in terms of handling concurrency of probe. The driver exports interface which is guarded by global '__scm' variable but: 1. Lacks proper read barrier (commit adding write barriers mixed up READ_ONCE with a read barrier). 2. Lacks barriers or checks for '__scm' in multiple places. 3. Lacks probe error cleanup. I fixed here few visible things, but this was not tested extensively. I tried only SM8450. ARM32 and SC8280xp/X1E platforms would be useful for testing as well. All the issues here are non-urgent, IOW, they were here for some time (v6.10-rc1 and earlier). Best regards, Krzysztof --- Krzysztof Kozlowski (6): firmware: qcom: scm: Fix missing read barrier in qcom_scm_is_available() firmware: qcom: scm: Fix missing read barrier in qcom_scm_get_tzmem_pool() firmware: qcom: scm: Handle various probe ordering for qcom_scm_assign_mem() [RFC/RFT] firmware: qcom: scm: Cleanup global '__scm' on probe failures firmware: qcom: scm: smc: Handle missing SCM device firmware: qcom: scm: smc: Narrow 'mempool' variable scope drivers/firmware/qcom/qcom_scm-smc.c | 6 +++- drivers/firmware/qcom/qcom_scm.c | 55 +++++++++++++++++++++++++----------- 2 files changed, 44 insertions(+), 17 deletions(-) --- base-commit: 414c97c966b69e4a6ea7b32970fa166b2f9b9ef0 change-id: 20241119-qcom-scm-missing-barriers-and-all-sort-of-srap-a25d59074882 Best regards,