This is a note to let you know that I've just added the patch titled
drm/amd/pm: avoid large variable on kernel stack
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amd-pm-avoid-large-variable-on-kernel-stack.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 93b69b4c6da579800b4e4ad460173eef30dc35e0
Author: Arnd Bergmann <arnd@xxxxxxxx>
Date: Thu Dec 15 17:36:31 2022 +0100
drm/amd/pm: avoid large variable on kernel stack
[ Upstream commit d118b18fb1da02b41df2da78cb2794b3638d89cd ]
The activity_monitor_external[] array is too big to fit on the
kernel stack, resulting in this warning with clang:
drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu13/smu_v13_0_7_ppt.c:1438:12: error: stack frame size (1040) exceeds limit (1024) in 'smu_v13_0_7_get_power_profile_mode' [-Werror,-Wframe-larger-than]
Use dynamic allocation instead. It should also be possible to
have single element here instead of the array, but this seems
easier.
v2: fix up argument to sizeof() (Alex)
Fixes: 334682ae8151 ("drm/amd/pm: enable workload type change on smu_v13_0_7")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c
index d74debc584f8..39deb06a86ba 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c
@@ -1436,7 +1436,7 @@ static int smu_v13_0_7_get_power_limit(struct smu_context *smu,
static int smu_v13_0_7_get_power_profile_mode(struct smu_context *smu, char *buf)
{
- DpmActivityMonitorCoeffIntExternal_t activity_monitor_external[PP_SMC_POWER_PROFILE_COUNT];
+ DpmActivityMonitorCoeffIntExternal_t *activity_monitor_external;
uint32_t i, j, size = 0;
int16_t workload_type = 0;
int result = 0;
@@ -1444,6 +1444,12 @@ static int smu_v13_0_7_get_power_profile_mode(struct smu_context *smu, char *buf
if (!buf)
return -EINVAL;
+ activity_monitor_external = kcalloc(PP_SMC_POWER_PROFILE_COUNT,
+ sizeof(*activity_monitor_external),
+ GFP_KERNEL);
+ if (!activity_monitor_external)
+ return -ENOMEM;
+
size += sysfs_emit_at(buf, size, " ");
for (i = 0; i <= PP_SMC_POWER_PROFILE_WINDOW3D; i++)
size += sysfs_emit_at(buf, size, "%-14s%s", amdgpu_pp_profile_name[i],
@@ -1456,15 +1462,17 @@ static int smu_v13_0_7_get_power_profile_mode(struct smu_context *smu, char *buf
workload_type = smu_cmn_to_asic_specific_index(smu,
CMN2ASIC_MAPPING_WORKLOAD,
i);
- if (workload_type < 0)
- return -EINVAL;
+ if (workload_type < 0) {
+ result = -EINVAL;
+ goto out;
+ }
result = smu_cmn_update_table(smu,
SMU_TABLE_ACTIVITY_MONITOR_COEFF, workload_type,
(void *)(&activity_monitor_external[i]), false);
if (result) {
dev_err(smu->adev->dev, "[%s] Failed to get activity monitor!", __func__);
- return result;
+ goto out;
}
}
@@ -1492,7 +1500,10 @@ do { \
PRINT_DPM_MONITOR(Fclk_BoosterFreq);
#undef PRINT_DPM_MONITOR
- return size;
+ result = size;
+out:
+ kfree(activity_monitor_external);
+ return result;
}
static int smu_v13_0_7_set_power_profile_mode(struct smu_context *smu, long *input, uint32_t size)
