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Sun, 03 Nov 2024 07:37:36 -0800 (PST) Received: from umbar.lan ([192.130.178.90]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-53c7bcce4fbsm1321133e87.128.2024.11.03.07.37.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 03 Nov 2024 07:37:36 -0800 (PST) From: Dmitry Baryshkov Date: Sun, 03 Nov 2024 17:37:30 +0200 Subject: [PATCH 2/2] firmware: qcom: scm: rework QSEECOM allowlist Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241103-rework-qseecom-v1-2-1d75d4eedc1e@linaro.org> References: <20241103-rework-qseecom-v1-0-1d75d4eedc1e@linaro.org> In-Reply-To: <20241103-rework-qseecom-v1-0-1d75d4eedc1e@linaro.org> To: Bjorn Andersson , Konrad Dybcio Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=3375; i=dmitry.baryshkov@linaro.org; h=from:subject:message-id; bh=mae3Gh6or7JrLymWCsMNtNCARjI7LWkDxZrSIGAGP9o=; b=owEBbQGS/pANAwAKAYs8ij4CKSjVAcsmYgBnJ5i6aTmspQrArnd1R8cZ/mcHVMrANrvz+hRkP DOUF8ZUGZ6JATMEAAEKAB0WIQRMcISVXLJjVvC4lX+LPIo+Aiko1QUCZyeYugAKCRCLPIo+Aiko 1Q4tCACoIz60m8eY8oQTgYlihqjtE1IK7qkRW077f6ZGhrrN2zNZxzhRuE1wyZVHUP9pPTnl3pd jd6VBVDKDuO5AY7FGN6zrCV70cISK86X8DwB3PxC27KgmH2xg8EF88icMrEJ03QJUjSlR4044gr AlV1jxJF1BLoYLJKqdjRt81RnHg/nHCRAYEhxXNhH5EX63j2ngpcRYnsH6BpEDiLOy8tvsE2PMb 5ZlSORscXTYBuLU4/CavL4lfrziK3d8ZwA/m6AkGS+Ct/1DC5KKnxxRl2JMwv7sa3qaM8sjQxcz DnXC1IKApNaTEa2TdjsHkuNmofNMOpljE4T0sakdzBVJRehf X-Developer-Key: i=dmitry.baryshkov@linaro.org; a=openpgp; fpr=8F88381DD5C873E4AE487DA5199BF1243632046A Listing individual machines in qcom_scm_qseecom_allowlist doesn't scale. Allow it to function as allow and disallow list at the same time by the means of the match->data and list the SoC families instead of devices. In case a particular device has buggy or incompatible firmware user still can disable QSEECOM by specifying qcom_scm.qseecom=off kernel param and (in the longer term) adding machine-specific entry to the qcom_scm_qseecom_allowlist table. Signed-off-by: Dmitry Baryshkov --- drivers/firmware/qcom/qcom_scm.c | 37 ++++++++++++++++++++----------------- 1 file changed, 20 insertions(+), 17 deletions(-) diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c index 9fed03d0a4b7e5709edf2db9a58b5326301008b4..6f70fbb0ddfbf88542ff2b3ed2bc372c2f3ce9eb 100644 --- a/drivers/firmware/qcom/qcom_scm.c +++ b/drivers/firmware/qcom/qcom_scm.c @@ -1743,28 +1743,23 @@ module_param(qseecom, charp, 0); /* * We do not yet support re-entrant calls via the qseecom interface. To prevent - * any potential issues with this, only allow validated machines for now. Users + * any potential issues with this, only allow validated platforms for now. Users * still can manually enable or disable it via the qcom_scm.qseecom modparam. + * + * To disable QSEECOM for a particular machine, add compatible entry and set + * data to (void *)false. */ static const struct of_device_id qcom_scm_qseecom_allowlist[] __maybe_unused = { - { .compatible = "dell,xps13-9345" }, - { .compatible = "lenovo,flex-5g" }, - { .compatible = "lenovo,thinkpad-t14s" }, - { .compatible = "lenovo,thinkpad-x13s", }, - { .compatible = "lenovo,yoga-slim7x" }, - { .compatible = "microsoft,arcata", }, - { .compatible = "microsoft,romulus13", }, - { .compatible = "microsoft,romulus15", }, - { .compatible = "qcom,sc8180x-primus" }, - { .compatible = "qcom,x1e80100-crd" }, - { .compatible = "qcom,x1e80100-qcp" }, + { .compatible = "qcom,sc8180x", .data = (void *)true }, + { .compatible = "qcom,sc8280xp", .data = (void *)true }, + { .compatible = "qcom,x1e80100", .data = (void *)true }, { } }; static bool qcom_scm_qseecom_machine_is_allowed(struct device *scm_dev) { struct device_node *np; - bool match; + const struct of_device_id *match; if (!strcmp(qseecom, "off")) { dev_info(scm_dev, "qseecom: disabled by modparam\n"); @@ -1783,7 +1778,17 @@ static bool qcom_scm_qseecom_machine_is_allowed(struct device *scm_dev) match = of_match_node(qcom_scm_qseecom_allowlist, np); of_node_put(np); - return match; + if (!match) { + dev_info(scm_dev, "qseecom: untested machine, skipping\n"); + return false; + } + + if (!match->data) { + dev_info(scm_dev, "qseecom: disabled by the allowlist\n"); + return false; + } + + return true; } static void qcom_scm_qseecom_free(void *data) @@ -1817,10 +1822,8 @@ static int qcom_scm_qseecom_init(struct qcom_scm *scm) dev_info(scm->dev, "qseecom: found qseecom with version 0x%x\n", version); - if (!qcom_scm_qseecom_machine_is_allowed(scm->dev)) { - dev_info(scm->dev, "qseecom: untested machine, skipping\n"); + if (!qcom_scm_qseecom_machine_is_allowed(scm->dev)) return 0; - } /* * Set up QSEECOM interface device. All application clients will be