drm/i915/xelpmp: Expose media as another GT

Xe_LPM+ platforms have "standalone media."  I.e., the media unit is
designed as an additional GT with its own engine list, GuC, forcewake,
etc.  Let's allow platforms to include media GTs in their device info.

v2:
 - Simplify GSI register handling and split it out to a separate patch
   for ease of review.  (Daniele)

Cc: Aravind Iddamsetty <aravind.iddamsetty@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Aravind Iddamsetty <aravind.iddamsetty@intel.com>
Acked-by: Aravind Iddamsetty <aravind.iddamsetty@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220906234934.3655440-13-matthew.d.roper@intel.com
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

drivers/gpu/drm/i915/Makefile

@@ -123,6 +123,7 @@ gt-y += \
 	gt/intel_ring.o \
 	gt/intel_ring_submission.o \
 	gt/intel_rps.o \
+	gt/intel_sa_media.o \
 	gt/intel_sseu.o \
 	gt/intel_sseu_debugfs.o \
 	gt/intel_timeline.o \

drivers/gpu/drm/i915/gt/intel_gt.c

@@ -30,6 +30,7 @@
 #include "intel_rc6.h"
 #include "intel_renderstate.h"
 #include "intel_rps.h"
+#include "intel_sa_media.h"
 #include "intel_gt_sysfs.h"
 #include "intel_uncore.h"
 #include "shmem_utils.h"
@@ -863,6 +864,11 @@ int intel_gt_probe_all(struct drm_i915_private *i915)
 			ret = intel_gt_tile_setup(gt, phys_addr + gtdef->mapping_base);
 			break;
 
+		case GT_MEDIA:
+			ret = intel_sa_mediagt_setup(gt, phys_addr + gtdef->mapping_base,
+						     gtdef->gsi_offset);
+			break;
+
 		case GT_PRIMARY:
 			/* Primary GT should not appear in extra GT list */
 		default:

drivers/gpu/drm/i915/gt/intel_gt_regs.h

@@ -1578,4 +1578,12 @@
 
 #define GEN12_SFC_DONE(n)			_MMIO(0x1cc000 + (n) * 0x1000)
 
+/*
+ * Standalone Media's non-engine GT registers are located at their regular GT
+ * offsets plus 0x380000.  This extra offset is stored inside the intel_uncore
+ * structure so that the existing code can be used for both GTs without
+ * modification.
+ */
+#define MTL_MEDIA_GSI_BASE			0x380000
+
 #endif /* __INTEL_GT_REGS__ */

drivers/gpu/drm/i915/gt/intel_gt_types.h

@@ -84,6 +84,7 @@ struct gt_defaults {
 enum intel_gt_type {
 	GT_PRIMARY,
 	GT_TILE,
+	GT_MEDIA,
 };
 
 struct intel_gt {

drivers/gpu/drm/i915/gt/intel_sa_media.c

@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2021 Intel Corporation
+ */
+
+#include <drm/drm_managed.h>
+
+#include "i915_drv.h"
+#include "gt/intel_gt.h"
+#include "gt/intel_sa_media.h"
+
+int intel_sa_mediagt_setup(struct intel_gt *gt, phys_addr_t phys_addr,
+			   u32 gsi_offset)
+{
+	struct drm_i915_private *i915 = gt->i915;
+	struct intel_uncore *uncore;
+
+	uncore = drmm_kzalloc(&i915->drm, sizeof(*uncore), GFP_KERNEL);
+	if (!uncore)
+		return -ENOMEM;
+
+	uncore->gsi_offset = gsi_offset;
+
+	intel_gt_common_init_early(gt);
+	intel_uncore_init_early(uncore, gt);
+
+	/*
+	 * Standalone media shares the general MMIO space with the primary
+	 * GT.  We'll re-use the primary GT's mapping.
+	 */
+	uncore->regs = i915->uncore.regs;
+	if (drm_WARN_ON(&i915->drm, uncore->regs == NULL))
+		return -EIO;
+
+	gt->uncore = uncore;
+	gt->phys_addr = phys_addr;
+
+	return 0;
+}

drivers/gpu/drm/i915/gt/intel_sa_media.h

@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2021 Intel Corporation
+ */
+#ifndef __INTEL_SA_MEDIA__
+#define __INTEL_SA_MEDIA__
+
+#include <linux/types.h>
+
+struct intel_gt;
+
+int intel_sa_mediagt_setup(struct intel_gt *gt, phys_addr_t phys_addr,
+			   u32 gsi_offset);
+
+#endif /* __INTEL_SA_MEDIA_H__ */

drivers/gpu/drm/i915/i915_pci.c

@@ -26,6 +26,9 @@
 #include <drm/drm_drv.h>
 #include <drm/i915_pciids.h>
 
+#include "gt/intel_gt_regs.h"
+#include "gt/intel_sa_media.h"
+
 #include "i915_driver.h"
 #include "i915_drv.h"
 #include "i915_pci.h"
@@ -1117,6 +1120,16 @@ static const struct intel_device_info pvc_info = {
 	.display.ver = 14,	\
 	.display.has_cdclk_crawl = 1
 
+static const struct intel_gt_definition xelpmp_extra_gt[] = {
+	{
+		.type = GT_MEDIA,
+		.name = "Standalone Media GT",
+		.gsi_offset = MTL_MEDIA_GSI_BASE,
+		.engine_mask = BIT(VECS0) | BIT(VCS0) | BIT(VCS2),
+	},
+	{}
+};
+
 __maybe_unused
 static const struct intel_device_info mtl_info = {
 	XE_HP_FEATURES,
@@ -1130,6 +1143,7 @@ static const struct intel_device_info mtl_info = {
 	.media.ver = 13,
 	PLATFORM(INTEL_METEORLAKE),
 	.display.has_modular_fia = 1,
+	.extra_gt_list = xelpmp_extra_gt,
 	.has_flat_ccs = 0,
 	.has_snoop = 1,
 	.memory_regions = REGION_SMEM | REGION_STOLEN_LMEM,