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drm/xe: Use max wopcm size when validating the preset GuC wopcm size

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When the GuC wopcm base and size registers are populated by BIOS/IFWI,
validate the parameters against the maximum allowed wopcm size.

Bpsec: 44982

Signed-off-by: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Balasubramani Vivekanandan 2023-03-17 22:23:35 +05:30 committed by Rodrigo Vivi
parent 1a653b879d
commit eb230dc47d
1 changed files with 9 additions and 0 deletions
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9
drivers/gpu/drm/xe/xe_wopcm.c
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@ -54,6 +54,8 @@
for MTL, do a proper probe
sooner or later */
#define GEN11_WOPCM_SIZE SZ_2M
#define GEN12_MAX_WOPCM_SIZE SZ_8M
/* 16KB WOPCM (RSVD WOPCM) is reserved from HuC firmware top. */
#define WOPCM_RESERVED_SIZE SZ_16K
@ -221,6 +223,13 @@ int xe_wopcm_init(struct xe_wopcm *wopcm)
if (locked) {
drm_dbg(&xe->drm, "GuC WOPCM is already locked [%uK, %uK)\n",
guc_wopcm_base / SZ_1K, guc_wopcm_size / SZ_1K);
/*
* When the GuC wopcm base and size are preprogrammed by
* BIOS/IFWI, check against the max allowed wopcm size to
* validate if the programmed values align to the wopcm layout.
*/
wopcm->size = GEN12_MAX_WOPCM_SIZE;
goto check;
}