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drm/amd/pm: Use uploaded size for legacy custom PPTable

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The legacy powerplay path used to allocate hardcode_pp_table from
the original VBIOS PPTable size, copy only the uploaded bytes into it,
and keep soft_pp_table_size unchanged. If a custom PPTable is shorter
than the original table, later code can still treat the stale tail as
valid table data.

Treat the uploaded buffer as the complete custom PPTable: duplicate the
uploaded buffer directly, replace hardcode_pp_table atomically, and set
soft_pp_table_size to the uploaded size.

Signed-off-by: Yang Wang <kevinyang.wang@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Yang Wang 2026-06-23 11:36:20 +08:00 committed by Alex Deucher
parent a17e79d01f
commit 055a40c32f
1 changed files with 8 additions and 13 deletions
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21
drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c
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@ -660,25 +660,20 @@ static int amd_powerplay_reset(void *handle)
static int pp_dpm_set_pp_table(void *handle, const char *buf, size_t size)
{
struct pp_hwmgr *hwmgr = handle;
void *hardcode_pp_table;
int ret = -ENOMEM;
if (!hwmgr || !hwmgr->pm_en)
if (!hwmgr || !hwmgr->pm_en || !buf || !size || size > U32_MAX)
return -EINVAL;
if (size > hwmgr->soft_pp_table_size)
return -EINVAL;
if (!hwmgr->hardcode_pp_table) {
hwmgr->hardcode_pp_table = kmemdup(hwmgr->soft_pp_table,
hwmgr->soft_pp_table_size,
GFP_KERNEL);
if (!hwmgr->hardcode_pp_table)
return ret;
}
memcpy(hwmgr->hardcode_pp_table, buf, size);
hardcode_pp_table = kmemdup(buf, size, GFP_KERNEL);
if (!hardcode_pp_table)
return ret;
kfree(hwmgr->hardcode_pp_table);
hwmgr->hardcode_pp_table = hardcode_pp_table;
hwmgr->soft_pp_table = hwmgr->hardcode_pp_table;
hwmgr->soft_pp_table_size = size;
ret = amd_powerplay_reset(handle);
if (ret)