drm/xe: Reinstate media GT support

Now that tiles and GTs are handled separately and other prerequisite
changes are in place, we're ready to re-enable the media GT.
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://lore.kernel.org/r/20230601215244.678611-31-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/regs/xe_gt_regs.h

@@ -8,6 +8,14 @@
 
 #include "regs/xe_reg_defs.h"
 
+/*
+ * The GSI register range [0x0 - 0x40000) is replicated at a higher offset
+ * for the media GT.  xe_mmio and xe_gt_mcr functions will automatically
+ * translate offsets by MEDIA_GT_GSI_OFFSET when operating on the media GT.
+ */
+#define MEDIA_GT_GSI_OFFSET				0x380000
+#define MEDIA_GT_GSI_LENGTH				0x40000
+
 /* RPM unit config (Gen8+) */
 #define RPM_CONFIG0					XE_REG(0xd00)
 #define   RPM_CONFIG0_CRYSTAL_CLOCK_FREQ_MASK		REG_GENMASK(5, 3)

drivers/gpu/drm/xe/xe_pci.c

@@ -545,7 +545,31 @@ static int xe_info_init(struct xe_device *xe,
 		if (MEDIA_VER(xe) < 13 && media_desc)
 			gt->info.__engine_mask |= media_desc->hw_engine_mask;
 
-		/* TODO: Init media GT, if present */
+		if (MEDIA_VER(xe) < 13 || !media_desc)
+			continue;
+
+		/*
+		 * Allocate and setup media GT for platforms with standalone
+		 * media.
+		 */
+		tile->media_gt = xe_gt_alloc(tile);
+		if (IS_ERR(tile->media_gt))
+			return PTR_ERR(tile->media_gt);
+
+		gt = tile->media_gt;
+		gt->info.type = XE_GT_TYPE_MEDIA;
+		gt->info.__engine_mask = media_desc->hw_engine_mask;
+		gt->mmio.adj_offset = MEDIA_GT_GSI_OFFSET;
+		gt->mmio.adj_limit = MEDIA_GT_GSI_LENGTH;
+
+		/*
+		 * FIXME: At the moment multi-tile and standalone media are
+		 * mutually exclusive on current platforms.  We'll need to
+		 * come up with a better way to number GTs if we ever wind
+		 * up with platforms that support both together.
+		 */
+		drm_WARN_ON(&xe->drm, id != 0);
+		gt->info.id = 1;
 	}
 
 	return 0;