drm/xe: Track whether platform has LLC

Some driver initialization is conditional on the presence of an LLC.
Add an extra feature flag to support this.
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://lore.kernel.org/r/20230410183910.2696628-2-matthew.d.roper@intel.comSigned-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_device_types.h

@@ -92,6 +92,8 @@ struct xe_device {
 		u8 has_flat_ccs:1;
 		/** @has_4tile: Whether tile-4 tiling is supported */
 		u8 has_4tile:1;
+		/** @has_llc: Device has a shared CPU+GPU last level cache */
+		u8 has_llc:1;
 		/** @has_range_tlb_invalidation: Has range based TLB invalidations */
 		u8 has_range_tlb_invalidation:1;
 		/** @has_link_copy_engines: Whether the platform has link copy engines */

drivers/gpu/drm/xe/xe_pci.c

@@ -55,6 +55,7 @@ struct xe_device_desc {
 	 * should eventually move entirely into the display code's own logic.
 	 */
 	u8 has_4tile:1;
+	u8 has_llc:1;
 };
 
 #define PLATFORM(x)		\
@@ -172,6 +173,7 @@ static const struct xe_device_desc tgl_desc = {
 	.graphics = &graphics_xelp,
 	.media = &media_xem,
 	PLATFORM(XE_TIGERLAKE),
+	.has_llc = 1,
 	.require_force_probe = true,
 };
 
@@ -179,6 +181,7 @@ static const struct xe_device_desc adl_s_desc = {
 	.graphics = &graphics_xelp,
 	.media = &media_xem,
 	PLATFORM(XE_ALDERLAKE_S),
+	.has_llc = 1,
 	.require_force_probe = true,
 };
 
@@ -188,6 +191,7 @@ static const struct xe_device_desc adl_p_desc = {
 	.graphics = &graphics_xelp,
 	.media = &media_xem,
 	PLATFORM(XE_ALDERLAKE_P),
+	.has_llc = 1,
 	.require_force_probe = true,
 	.subplatforms = (const struct xe_subplatform_desc[]) {
 		{ XE_SUBPLATFORM_ADLP_RPLU, "RPLU", adlp_rplu_ids },
@@ -491,6 +495,7 @@ static int xe_info_init(struct xe_device *xe,
 	xe->info.graphics_name = graphics_desc->name;
 	xe->info.media_name = media_desc ? media_desc->name : "none";
 	xe->info.has_4tile = desc->has_4tile;
+	xe->info.has_llc = desc->has_llc;
 
 	xe->info.dma_mask_size = graphics_desc->dma_mask_size;
 	xe->info.vram_flags = graphics_desc->vram_flags;