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Subject[PATCH] drm/amd/pm: avoid large variable on kernel stack
Date
From: Arnd Bergmann <arnd@arndb.de>

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.

Fixes: 334682ae8151 ("drm/amd/pm: enable workload type change on smu_v13_0_7")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
.../drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c | 21 ++++++++++++++-----
1 file changed, 16 insertions(+), 5 deletions(-)

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 c270f94a1b86..7eba854e09ec 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
@@ -1439,7 +1439,7 @@ 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;
@@ -1447,6 +1447,12 @@ static int smu_v13_0_7_get_power_profile_mode(struct smu_context *smu, char *buf
if (!buf)
return -EINVAL;

+ activity_monitor_external = kcalloc(sizeof(activity_monitor_external),
+ PP_SMC_POWER_PROFILE_COUNT,
+ 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],
@@ -1459,15 +1465,17 @@ 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;
}
}

@@ -1495,7 +1503,10 @@ 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)
--
2.35.1
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