drm/xe: Add sysfs entry to report per tile memory size

Add sysfs entry to read per tile physical memory
including stolen memory.

V5:
  - rename var name and make it part of vram struct - Lucas
V4:
  - %s/addr_range/physical_vram_size_byes, make it
    user readable name - Joonas/Aravind
  - Display in bytes - Joonas/Aravind
V3:
  - Exclude DG1, replace sysfs_create_file/files - Aravind
V2:
  - Use DEVICE_ATTR_RO - Aravind
  - Dont put kobj on sysfs_file_create fail - Himal
  - Skip addr_range sysfs create for non dgfx - Himal
Reviewed-by: Aravind Iddamsetty <aravind.iddamsetty@intel.com>
Signed-off-by: Tejas Upadhyay <tejas.upadhyay@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_device_types.h

@@ -124,6 +124,11 @@ struct xe_tile {
 			resource_size_t base;
 			/** @size: size of VRAM. */
 			resource_size_t size;
+			/**
+			 * @actual_physical_size: Actual VRAM size
+			 * including stolen mem for tile
+			 */
+			resource_size_t actual_physical_size;
 			/** @mapping: pointer to VRAM mappable space */
 			void *__iomem mapping;
 		} vram;

drivers/gpu/drm/xe/xe_mmio.c

@@ -277,6 +277,7 @@ int xe_mmio_probe_vram(struct xe_device *xe)
 		if (err)
 			return err;
 
+		tile->mem.vram.actual_physical_size = tile_size;
 		tile->mem.vram.io_start = xe->mem.vram.io_start + tile_offset;
 		tile->mem.vram.io_size = min_t(u64, vram_size, io_size);
 

drivers/gpu/drm/xe/xe_tile_sysfs.c

@@ -20,6 +20,20 @@ static const struct kobj_type xe_tile_sysfs_kobj_type = {
 	.sysfs_ops = &kobj_sysfs_ops,
 };
 
+static ssize_t
+physical_vram_size_bytes_show(struct device *kdev, struct device_attribute *attr,
+			      char *buf)
+{
+	struct xe_tile *tile = kobj_to_tile(&kdev->kobj);
+
+	return sysfs_emit(buf, "%llu\n", tile->mem.vram.actual_physical_size);
+}
+
+static DEVICE_ATTR_RO(physical_vram_size_bytes);
+
+static const struct attribute *physical_memsize_attr =
+	&dev_attr_physical_vram_size_bytes.attr;
+
 static void tile_sysfs_fini(struct drm_device *drm, void *arg)
 {
 	struct xe_tile *tile = arg;
@@ -50,6 +64,11 @@ void xe_tile_sysfs_init(struct xe_tile *tile)
 
 	tile->sysfs = &kt->base;
 
+	if (IS_DGFX(xe) && xe->info.platform != XE_DG1 &&
+	    sysfs_create_file(tile->sysfs, physical_memsize_attr))
+		drm_warn(&xe->drm,
+			 "Sysfs creation to read addr_range per tile failed\n");
+
 	err = drmm_add_action_or_reset(&xe->drm, tile_sysfs_fini, tile);
 	if (err) {
 		drm_warn(&xe->drm, "%s: drmm_add_action_or_reset failed, err: %d\n",