From: Qingqing Zhou <quic_qqzhou@xxxxxxxxxxx>
When enabling SHM bridge, QTEE returns 0 and sets error 4 in result to
qcom_scm for unsupported platforms. Currently, tzmem interprets this as
an unknown error rather than recognizing it as an unsupported platform.
Error log:
[ 0.177224] qcom_scm firmware:scm: error (____ptrval____): Failed to enable the TrustZone memory allocator
[ 0.177244] qcom_scm firmware:scm: probe with driver qcom_scm failed with error 4
To address this, modify the function call qcom_scm_shm_bridge_enable()
to remap result to indicate an unsupported error. This way, tzmem will
correctly identify it as an unsupported platform case instead of
reporting it as an error.
Fixes: 178e19c0df1b ("firmware: qcom: scm: add support for SHM bridge operations")
Signed-off-by: Qingqing Zhou <quic_qqzhou@xxxxxxxxxxx>
Co-developed-by: Kuldeep Singh <quic_kuldsing@xxxxxxxxxxx>
Signed-off-by: Kuldeep Singh <quic_kuldsing@xxxxxxxxxxx>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
Reviewed-by: Mukesh Ojha <quic_mojha@xxxxxxxxxxx>
---
v3:
- Split patch series as it's a fix and required for other dependent patches.
v2:
- Link: https://lore.kernel.org/linux-arm-msm/20241014111527.2272428-1-quic_kuldsing@xxxxxxxxxxx/
v1:
- Link: https://lore.kernel.org/linux-arm-msm/20241005140150.4109700-1-quic_kuldsing@xxxxxxxxxxx/
drivers/firmware/qcom/qcom_scm.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
index fba3ac676d1d..478538604225 100644
--- a/drivers/firmware/qcom/qcom_scm.c
+++ b/drivers/firmware/qcom/qcom_scm.c
@@ -112,6 +112,7 @@ enum qcom_scm_qseecom_tz_cmd_info {
};
#define QSEECOM_MAX_APP_NAME_SIZE 64
+#define SHMBRIDGE_RESULT_NOTSUPP 4
/* Each bit configures cold/warm boot address for one of the 4 CPUs */
static const u8 qcom_scm_cpu_cold_bits[QCOM_SCM_BOOT_MAX_CPUS] = {
@@ -1361,6 +1362,8 @@ EXPORT_SYMBOL_GPL(qcom_scm_lmh_dcvsh_available);
int qcom_scm_shm_bridge_enable(void)
{
+ int ret;
+
struct qcom_scm_desc desc = {
.svc = QCOM_SCM_SVC_MP,
.cmd = QCOM_SCM_MP_SHM_BRIDGE_ENABLE,
@@ -1373,7 +1376,15 @@ int qcom_scm_shm_bridge_enable(void)
QCOM_SCM_MP_SHM_BRIDGE_ENABLE))
return -EOPNOTSUPP;
- return qcom_scm_call(__scm->dev, &desc, &res) ?: res.result[0];
+ ret = qcom_scm_call(__scm->dev, &desc, &res);
+
+ if (ret)
+ return ret;
+
+ if (res.result[0] == SHMBRIDGE_RESULT_NOTSUPP)
+ return -EOPNOTSUPP;
+
+ return res.result[0];
}
EXPORT_SYMBOL_GPL(qcom_scm_shm_bridge_enable);
--
2.34.1
