[Intel-xe] [PATCH 1/3] drm/xe: Remove unused revid from firmware name

[Matt Roper]

On Thu, Mar 23, 2023 at 10:17:52PM -0700, Lucas De Marchi wrote:
> The rev field is always 0 so it ends up never used. In i915 it was
> introduced because of CML: up to rev 5 it reuses the guc and huc
> firmware blobs from KBL. After that there is a specific firmware for
> that platform.  This can be reintroduced later if ever needed.

I doubt we'd ever need the revid again; more likely we'd want a way to
select different firmwares for a given subplatform (which is something I
think we need to add anyway for ADL-N).

Reviewed-by: Matt Roper <matthew.d.roper at intel.com>


Matt

> 
> With the removal of revid the packed attribute in
> uc_fw_platform_requirement, which is there only for reducing the space
> these tables take, can also be removed since it has even more limited
> usefulness: currently there's only padding of 2 bytes. Remove the
> attribute to avoid the unaligned access.
> 
> 	$ pahole -C uc_fw_platform_requirement build64/drivers/gpu/drm/xe/xe_uc_fw.o
> 	struct uc_fw_platform_requirement {
> 		enum xe_platform           p;                    /*     0     4 */
> 		const struct uc_fw_blob    blob;                 /*     4    10 */
> 
> 		/* size: 16, cachelines: 1, members: 2 */
> 		/* padding: 2 */
> 		/* last cacheline: 16 bytes */
> 	};
> 
> Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
> ---
>  drivers/gpu/drm/xe/xe_uc_fw.c | 33 +++++++++++++++------------------
>  1 file changed, 15 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/gpu/drm/xe/xe_uc_fw.c b/drivers/gpu/drm/xe/xe_uc_fw.c
> index e9b30e620fd9..e2c982b37e87 100644
> --- a/drivers/gpu/drm/xe/xe_uc_fw.c
> +++ b/drivers/gpu/drm/xe/xe_uc_fw.c
> @@ -39,21 +39,21 @@ static struct xe_device *uc_fw_to_xe(struct xe_uc_fw *uc_fw)
>  
>  /*
>   * List of required GuC and HuC binaries per-platform.
> - * Must be ordered based on platform + revid, from newer to older.
> + * Must be ordered based on platform, from newer to older.
>   */
>  #define XE_GUC_FIRMWARE_DEFS(fw_def, guc_def) \
> -	fw_def(METEORLAKE,   0, guc_def(mtl,  70, 5, 2)) \
> -	fw_def(ALDERLAKE_P,  0, guc_def(adlp,  70, 5, 2)) \
> -	fw_def(ALDERLAKE_S,  0, guc_def(tgl,  70, 5, 2)) \
> -	fw_def(PVC,          0, guc_def(pvc,  70, 5, 2)) \
> -	fw_def(DG2,          0, guc_def(dg2,  70, 5, 2)) \
> -	fw_def(DG1,          0, guc_def(dg1,  70, 5, 2)) \
> -	fw_def(TIGERLAKE,    0, guc_def(tgl,  70, 5, 2))
> +	fw_def(METEORLAKE,   guc_def(mtl,  70, 5, 2)) \
> +	fw_def(ALDERLAKE_P,  guc_def(adlp,  70, 5, 2)) \
> +	fw_def(ALDERLAKE_S,  guc_def(tgl,  70, 5, 2)) \
> +	fw_def(PVC,          guc_def(pvc,  70, 5, 2)) \
> +	fw_def(DG2,          guc_def(dg2,  70, 5, 2)) \
> +	fw_def(DG1,          guc_def(dg1,  70, 5, 2)) \
> +	fw_def(TIGERLAKE,    guc_def(tgl,  70, 5, 2))
>  
>  #define XE_HUC_FIRMWARE_DEFS(fw_def, huc_def, huc_ver) \
> -	fw_def(ALDERLAKE_S,  0, huc_def(tgl)) \
> -	fw_def(DG1,          0, huc_def(dg1)) \
> -	fw_def(TIGERLAKE,    0, huc_def(tgl))
> +	fw_def(ALDERLAKE_S,	huc_def(tgl)) \
> +	fw_def(DG1,		huc_def(dg1)) \
> +	fw_def(TIGERLAKE,	huc_def(tgl))
>  
>  #define __MAKE_HUC_FW_PATH(prefix_, name_) \
>          "i915/" \
> @@ -82,7 +82,7 @@ static struct xe_device *uc_fw_to_xe(struct xe_uc_fw *uc_fw)
>  
>  
>  /* All blobs need to be declared via MODULE_FIRMWARE() */
> -#define XE_UC_MODULE_FW(platform_, revid_, uc_) \
> +#define XE_UC_MODULE_FW(platform_, uc_) \
>  	MODULE_FIRMWARE(uc_);
>  
>  XE_GUC_FIRMWARE_DEFS(XE_UC_MODULE_FW, MAKE_GUC_FW_PATH)
> @@ -109,16 +109,14 @@ struct __packed uc_fw_blob {
>  	UC_FW_BLOB(major_, minor_, \
>  		   MAKE_HUC_FW_PATH_FULL_VER(prefix_, major_, minor_, bld_num_))
>  
> -struct __packed uc_fw_platform_requirement {
> +struct uc_fw_platform_requirement {
>  	enum xe_platform p;
> -	u8 rev; /* first platform rev using this FW */
>  	const struct uc_fw_blob blob;
>  };
>  
> -#define MAKE_FW_LIST(platform_, revid_, uc_) \
> +#define MAKE_FW_LIST(platform_, uc_) \
>  { \
>  	.p = XE_##platform_, \
> -	.rev = revid_, \
>  	.blob = uc_, \
>  },
>  
> @@ -143,7 +141,6 @@ uc_fw_auto_select(struct xe_device *xe, struct xe_uc_fw *uc_fw)
>  	static const struct uc_fw_platform_requirement *fw_blobs;
>  	enum xe_platform p = xe->info.platform;
>  	u32 fw_count;
> -	u8 rev = xe->info.revid;
>  	int i;
>  
>  	XE_BUG_ON(uc_fw->type >= ARRAY_SIZE(blobs_all));
> @@ -151,7 +148,7 @@ uc_fw_auto_select(struct xe_device *xe, struct xe_uc_fw *uc_fw)
>  	fw_count = blobs_all[uc_fw->type].count;
>  
>  	for (i = 0; i < fw_count && p <= fw_blobs[i].p; i++) {
> -		if (p == fw_blobs[i].p && rev >= fw_blobs[i].rev) {
> +		if (p == fw_blobs[i].p) {
>  			const struct uc_fw_blob *blob = &fw_blobs[i].blob;
>  
>  			uc_fw->path = blob->path;
> -- 
> 2.39.0
> 

-- 
Matt Roper
Graphics Software Engineer
Linux GPU Platform Enablement
Intel Corporation