drm/i915: Prepare more multi-GT initialization

We're going to introduce an additional intel_gt for MTL's media unit
soon.  Let's provide a bit more multi-GT initialization framework in
preparation for that.  The initialization will pull the list of GTs for
a platform from the device info structure.  Although necessary for the
immediate MTL media enabling, this same framework will also be used
farther down the road when we enable remote tiles on xehpsdv and pvc.

v2:
 - Re-add missing test for !HAS_EXTRA_GT_LIST in intel_gt_probe_all().

v3:
 - Move intel_gt_definition struct to intel_gt_types.h.  (Jani)
 - Drop gtdef->setup().  For now we'll just use a switch() based on GT
   type since we don't have too many different handlers for the
   foreseeable future.  (Jani)

Cc: Aravind Iddamsetty <aravind.iddamsetty@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Reviewed-by: Aravind Iddamsetty <aravind.iddamsetty@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220906234934.3655440-6-matthew.d.roper@intel.comSigned-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

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

@@ -736,7 +736,7 @@ static intel_engine_mask_t init_engine_mask(struct intel_gt *gt)
 	u16 vdbox_mask;
 	u16 vebox_mask;
 
-	info->engine_mask = INTEL_INFO(i915)->platform_engine_mask;
+	GEM_BUG_ON(!info->engine_mask);
 
 	if (GRAPHICS_VER(i915) < 11)
 		return info->engine_mask;

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

@@ -806,8 +806,10 @@ int intel_gt_probe_all(struct drm_i915_private *i915)
 {
 	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
 	struct intel_gt *gt = &i915->gt0;
+	const struct intel_gt_definition *gtdef;
 	phys_addr_t phys_addr;
 	unsigned int mmio_bar;
+	unsigned int i;
 	int ret;
 
 	mmio_bar = GRAPHICS_VER(i915) == 2 ? 1 : 0;
@@ -818,14 +820,69 @@ int intel_gt_probe_all(struct drm_i915_private *i915)
 	 * and it has been already initialized early during probe
 	 * in i915_driver_probe()
 	 */
+	gt->i915 = i915;
+	gt->name = "Primary GT";
+	gt->info.engine_mask = INTEL_INFO(i915)->platform_engine_mask;
+
+	drm_dbg(&i915->drm, "Setting up %s\n", gt->name);
 	ret = intel_gt_tile_setup(gt, phys_addr);
 	if (ret)
 		return ret;
 
 	i915->gt[0] = gt;
 
-	/* TODO: add more tiles */
+	if (!HAS_EXTRA_GT_LIST(i915))
+		return 0;
+
+	for (i = 1, gtdef = &INTEL_INFO(i915)->extra_gt_list[i - 1];
+	     gtdef->name != NULL;
+	     i++, gtdef = &INTEL_INFO(i915)->extra_gt_list[i - 1]) {
+		gt = drmm_kzalloc(&i915->drm, sizeof(*gt), GFP_KERNEL);
+		if (!gt) {
+			ret = -ENOMEM;
+			goto err;
+		}
+
+		gt->i915 = i915;
+		gt->name = gtdef->name;
+		gt->type = gtdef->type;
+		gt->info.engine_mask = gtdef->engine_mask;
+		gt->info.id = i;
+
+		drm_dbg(&i915->drm, "Setting up %s\n", gt->name);
+		if (GEM_WARN_ON(range_overflows_t(resource_size_t,
+						  gtdef->mapping_base,
+						  SZ_16M,
+						  pci_resource_len(pdev, mmio_bar)))) {
+			ret = -ENODEV;
+			goto err;
+		}
+
+		switch (gtdef->type) {
+		case GT_TILE:
+			ret = intel_gt_tile_setup(gt, phys_addr + gtdef->mapping_base);
+			break;
+
+		case GT_PRIMARY:
+			/* Primary GT should not appear in extra GT list */
+		default:
+			MISSING_CASE(gtdef->type);
+			ret = -ENODEV;
+		}
+
+		if (ret)
+			goto err;
+
+		i915->gt[i] = gt;
+	}
+
 	return 0;
+
+err:
+	i915_probe_error(i915, "Failed to initialize %s! (%d)\n", gtdef->name, ret);
+	intel_gt_release_all(i915);
+
+	return ret;
 }
 
 int intel_gt_tiles_init(struct drm_i915_private *i915)

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

@@ -54,7 +54,6 @@ void intel_gt_driver_register(struct intel_gt *gt);
 void intel_gt_driver_unregister(struct intel_gt *gt);
 void intel_gt_driver_remove(struct intel_gt *gt);
 void intel_gt_driver_release(struct intel_gt *gt);
-
 void intel_gt_driver_late_release_all(struct drm_i915_private *i915);
 
 int intel_gt_wait_for_idle(struct intel_gt *gt, long timeout);

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

@@ -81,8 +81,16 @@ struct gt_defaults {
 	u32 max_freq;
 };
 
+enum intel_gt_type {
+	GT_PRIMARY,
+	GT_TILE,
+};
+
 struct intel_gt {
 	struct drm_i915_private *i915;
+	const char *name;
+	enum intel_gt_type type;
+
 	struct intel_uncore *uncore;
 	struct i915_ggtt *ggtt;
 
@@ -262,6 +270,13 @@ struct intel_gt {
 	struct kobject *sysfs_defaults;
 };
 
+struct intel_gt_definition {
+	enum intel_gt_type type;
+	char *name;
+	u32 mapping_base;
+	intel_engine_mask_t engine_mask;
+};
+
 enum intel_gt_scratch_field {
 	/* 8 bytes */
 	INTEL_GT_SCRATCH_FIELD_DEFAULT = 0,

drivers/gpu/drm/i915/i915_drv.h

@@ -1369,6 +1369,8 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 #define HAS_REGION(i915, i) (INTEL_INFO(i915)->memory_regions & (i))
 #define HAS_LMEM(i915) HAS_REGION(i915, REGION_LMEM)
 
+#define HAS_EXTRA_GT_LIST(dev_priv)   (INTEL_INFO(dev_priv)->extra_gt_list)
+
 /*
  * Platform has the dedicated compression control state for each lmem surfaces
  * stored in lmem to support the 3D and media compression formats.

drivers/gpu/drm/i915/intel_device_info.h

@@ -37,6 +37,7 @@
 
 struct drm_printer;
 struct drm_i915_private;
+struct intel_gt_definition;
 
 /* Keep in gen based order, and chronological order within a gen */
 enum intel_platform {
@@ -222,6 +223,8 @@ struct intel_device_info {
 
 	u32 display_mmio_offset;
 
+	const struct intel_gt_definition *extra_gt_list;
+
 	u8 gt; /* GT number, 0 if undefined */
 
 #define DEFINE_FLAG(name) u8 name:1

drivers/gpu/drm/i915/selftests/mock_gem_device.c

@@ -115,6 +115,7 @@ static struct dev_pm_domain pm_domain = {
 static void mock_gt_probe(struct drm_i915_private *i915)
 {
 	i915->gt[0] = &i915->gt0;
+	i915->gt[0]->name = "Mock GT";
 }
 
 struct drm_i915_private *mock_gem_device(void)