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@arndb.de>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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 d74debc..39deb06 100644 (file)
--- 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)