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[2001:14ba:a0c3:3a00:264b:feff:fe8b:be8a]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-32b97f5980bsm17843851fa.7.2025.06.24.15.53.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Jun 2025 15:53:30 -0700 (PDT) From: Dmitry Baryshkov Date: Wed, 25 Jun 2025 01:53:22 +0300 Subject: [PATCH v4 3/8] firmware: qcom: uefisecapp: add support for R/O UEFI vars Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250625-more-qseecom-v4-3-aacca9306cee@oss.qualcomm.com> References: <20250625-more-qseecom-v4-0-aacca9306cee@oss.qualcomm.com> In-Reply-To: <20250625-more-qseecom-v4-0-aacca9306cee@oss.qualcomm.com> To: Bjorn Andersson , Maximilian Luz , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Ard Biesheuvel , Konrad Dybcio Cc: Johan Hovold , Steev Klimaszewski , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-efi@vger.kernel.org, Konrad Dybcio X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=2930; i=dmitry.baryshkov@oss.qualcomm.com; h=from:subject:message-id; bh=TpzKss6UqA2cLICb253kuxKt/G/KQj9NlkXx3BbhyVI=; b=owEBbQGS/pANAwAKAYs8ij4CKSjVAcsmYgBoWyxigvWyn4A+onkiU+AFmVnTp+eG/+F69fK94 JtVCN4LCVmJATMEAAEKAB0WIQRMcISVXLJjVvC4lX+LPIo+Aiko1QUCaFssYgAKCRCLPIo+Aiko 1ZhwB/49S5NGzvatWyOAaoIdQKCjjG9EEZ6OG66sXVZht8tAHyXEhVQmxE27iZqgsflAmoTqgQW 4KIpuExKh2ber1GsFTblUrTDPl0ZT/ICK95AHQsby0oIrKMZ5vHxnoHVTu48YtoPcc0jiywKYM+ UZJYxaMAFAxpv+OlrbddVdJKRWpd0vkf+vrrwnWJi456aKJRpqbQM+HfXwtHNYp5dM8DwTtXMcv 44ZUXjJlRu5tMe1sA/N2Ve2mclA6cMf4bkeJgU0Rj99Rg9NhPivnrL0PONtpck6fl+zjaK/z1Sj 1L3L8j+hcZrmgNJ6SvfMWtwJUx01YJfOwDfj2H2ceocdZUky X-Developer-Key: i=dmitry.baryshkov@oss.qualcomm.com; a=openpgp; fpr=8F88381DD5C873E4AE487DA5199BF1243632046A X-Proofpoint-ORIG-GUID: oPbW-S1MdApJVudAZD46uD5qblx82fhU X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNjI0MDE4MiBTYWx0ZWRfX3Y0J65GUvil6 YV+XNAh+vS7ibhij2CL+P3qMf94ig3sjzZhg/IaGNhb24MrOtwGvrPFtRBKdH8YyQ+57DQyCW4M Ectjz3cc84C0oixWDsOgTqvSpEiiCezYKtfrF2a0Q57iWcI2/x/seARw59kNwZw4Nkz6tdCOpua 3LFG0nGXB8iZ0ov/fVLwFRTWf2ErqcFFKI3qifUviy7tuWzCsETbdy6rc/QvGlUH1iqBpOaZ3zC Iqj/+eJzu285o5FOtR1Llbbdgxmbm6oLlz161qd5CyhPHbeeCI9lGPHYSoBMF3uG8BS+n6ZB24i D7Stcptb6z9JnyAY6c/DL+JC8WgT/B5k8a5hXTiOcW11oDUgo+LFdkwWOP77hMCpW85nR6VA7np kjcwr/p7n9dThibAgglKDRFSVKaBEehsnye4+46JdPB5dQVZ6Jw7jOqLXyC8SVZGCvAYPks0 X-Authority-Analysis: v=2.4 cv=L4kdQ/T8 c=1 sm=1 tr=0 ts=685b2c6c cx=c_pps a=hnmNkyzTK/kJ09Xio7VxxA==:117 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=6IFa9wvqVegA:10 a=EUspDBNiAAAA:8 a=hoImanld2GFzOgiN87EA:9 a=QEXdDO2ut3YA:10 a=PEH46H7Ffwr30OY-TuGO:22 X-Proofpoint-GUID: oPbW-S1MdApJVudAZD46uD5qblx82fhU X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.7,FMLib:17.12.80.40 definitions=2025-06-24_06,2025-06-23_07,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 malwarescore=0 bulkscore=0 clxscore=1015 suspectscore=0 adultscore=0 priorityscore=1501 impostorscore=0 lowpriorityscore=0 spamscore=0 phishscore=0 mlxlogscore=999 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2506240182 For some platforms (e.g. Lenovo Yoga C630) we don't yet know a way to update variables in the permanent storage. However being able to read the vars is still useful as it allows us to get e.g. RTC offset. Add a quirk for QSEECOM specifying that UEFI variables for this platform should be registered in read-only mode. Reviewed-by: Konrad Dybcio Signed-off-by: Dmitry Baryshkov --- drivers/firmware/qcom/qcom_qseecom_uefisecapp.c | 18 +++++++++++++++++- include/linux/firmware/qcom/qcom_qseecom.h | 2 ++ 2 files changed, 19 insertions(+), 1 deletion(-) diff --git a/drivers/firmware/qcom/qcom_qseecom_uefisecapp.c b/drivers/firmware/qcom/qcom_qseecom_uefisecapp.c index 98a463e9774bf04f2deb0f7fa1318bd0d2edfa49..05f700dcb8cf3189f640237ff0e045564abb8264 100644 --- a/drivers/firmware/qcom/qcom_qseecom_uefisecapp.c +++ b/drivers/firmware/qcom/qcom_qseecom_uefisecapp.c @@ -792,6 +792,12 @@ static efi_status_t qcuefi_query_variable_info(u32 attr, u64 *storage_space, u64 return status; } +static const struct efivar_operations qcom_efivars_ro_ops = { + .get_variable = qcuefi_get_variable, + .get_next_variable = qcuefi_get_next_variable, + .query_variable_info = qcuefi_query_variable_info, +}; + static const struct efivar_operations qcom_efivar_ops = { .get_variable = qcuefi_get_variable, .set_variable = qcuefi_set_variable, @@ -804,7 +810,9 @@ static const struct efivar_operations qcom_efivar_ops = { static int qcom_uefisecapp_probe(struct auxiliary_device *aux_dev, const struct auxiliary_device_id *aux_dev_id) { + unsigned long *quirks = aux_dev->dev.platform_data; struct qcom_tzmem_pool_config pool_config; + const struct efivar_operations *ops; struct qcuefi_client *qcuefi; int status; @@ -829,7 +837,15 @@ static int qcom_uefisecapp_probe(struct auxiliary_device *aux_dev, if (status) return status; - status = efivars_register(&qcuefi->efivars, &qcom_efivar_ops); + if (quirks && + *quirks & QCOM_QSEECOM_QUIRK_RO_UEFIVARS) { + dev_dbg(&aux_dev->dev, "R/O UEFI vars implementation\n"); + ops = &qcom_efivars_ro_ops; + } else { + ops = &qcom_efivar_ops; + } + + status = efivars_register(&qcuefi->efivars, ops); if (status) qcuefi_set_reference(NULL); diff --git a/include/linux/firmware/qcom/qcom_qseecom.h b/include/linux/firmware/qcom/qcom_qseecom.h index 3387897bf36843cccd0bd933dd562390bf674b14..8d6d660e854fdb0fabbef10ab5ee6ff23ad79826 100644 --- a/include/linux/firmware/qcom/qcom_qseecom.h +++ b/include/linux/firmware/qcom/qcom_qseecom.h @@ -51,4 +51,6 @@ static inline int qcom_qseecom_app_send(struct qseecom_client *client, return qcom_scm_qseecom_app_send(client->app_id, req, req_size, rsp, rsp_size); } +#define QCOM_QSEECOM_QUIRK_RO_UEFIVARS BIT(0) + #endif /* __QCOM_QSEECOM_H */