drm/xe: Make xe_mem_region struct

Make a xe_mem_region structure which will be used in the
coming patches. The new structure is used in both xe device
level (xe->mem.vram) and xe_tile level (tile->vram).

Make the definition of xe_mem_region.dpa_base to be the DPA
base of this memory region and change codes according to
this new definition.

v1:
  - rename xe_mem_region.base to dpa_base per conversation with Mike
    Ruhl
Signed-off-by: Oak Zeng <oak.zeng@intel.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_bo.c

@@ -1469,7 +1469,7 @@ uint64_t vram_region_gpu_offset(struct ttm_resource *res)
 	if (res->mem_type == XE_PL_STOLEN)
 		return xe_ttm_stolen_gpu_offset(xe);
 
-	return xe->mem.vram.base + tile->mem.vram.base;
+	return tile->mem.vram.dpa_base;
 }
 
 /**

drivers/gpu/drm/xe/xe_device_types.h

@@ -50,6 +50,44 @@ struct xe_ggtt;
 		 const struct xe_tile * : (const struct xe_device *)((tile__)->xe),	\
 		 struct xe_tile * : (tile__)->xe)
 
+/**
+ * struct xe_mem_region - memory region structure
+ * This is used to describe a memory region in xe
+ * device, such as HBM memory or CXL extension memory.
+ */
+struct xe_mem_region {
+	/** @io_start: IO start address of this VRAM instance */
+	resource_size_t io_start;
+	/**
+	 * @io_size: IO size of this VRAM instance
+	 *
+	 * This represents how much of this VRAM we can access
+	 * via the CPU through the VRAM BAR. This can be smaller
+	 * than @usable_size, in which case only part of VRAM is CPU
+	 * accessible (typically the first 256M). This
+	 * configuration is known as small-bar.
+	 */
+	resource_size_t io_size;
+	/** @dpa_base: This memory regions's DPA (device physical address) base */
+	resource_size_t dpa_base;
+	/**
+	 * @usable_size: usable size of VRAM
+	 *
+	 * Usable size of VRAM excluding reserved portions
+	 * (e.g stolen mem)
+	 */
+	resource_size_t usable_size;
+	/**
+	 * @actual_physical_size: Actual VRAM size
+	 *
+	 * Actual VRAM size including reserved portions
+	 * (e.g stolen mem)
+	 */
+	resource_size_t actual_physical_size;
+	/** @mapping: pointer to VRAM mappable space */
+	void *__iomem mapping;
+};
+
 /**
  * struct xe_tile - hardware tile structure
  *
@@ -107,38 +145,7 @@ struct xe_tile {
 		 * Although VRAM is associated with a specific tile, it can
 		 * still be accessed by all tiles' GTs.
 		 */
-		struct {
-			/** @io_start: IO start address of this VRAM instance */
-			resource_size_t io_start;
-			/**
-			 * @io_size: IO size of this VRAM instance
-			 *
-			 * This represents how much of this VRAM we can access
-			 * via the CPU through the VRAM BAR. This can be smaller
-			 * than @size, in which case only part of VRAM is CPU
-			 * accessible (typically the first 256M). This
-			 * configuration is known as small-bar.
-			 */
-			resource_size_t io_size;
-			/** @base: offset of VRAM starting base */
-			resource_size_t base;
-			/**
-			 * @usable_size: usable size of VRAM
-			 *
-			 * Usable size of VRAM excluding reserved portions
-			 * (e.g stolen mem)
-			 */
-			resource_size_t usable_size;
-			/**
-			 * @actual_physical_size: Actual VRAM size
-			 *
-			 * Actual VRAM size including reserved portions
-			 * (e.g stolen mem)
-			 */
-			resource_size_t actual_physical_size;
-			/** @mapping: pointer to VRAM mappable space */
-			void *__iomem mapping;
-		} vram;
+		struct xe_mem_region vram;
 
 		/** @vram_mgr: VRAM TTM manager */
 		struct xe_ttm_vram_mgr *vram_mgr;
@@ -247,28 +254,7 @@ struct xe_device {
 	/** @mem: memory info for device */
 	struct {
 		/** @vram: VRAM info for device */
-		struct {
-			/** @io_start: IO start address of VRAM */
-			resource_size_t io_start;
-			/**
-			 * @io_size: IO size of VRAM.
-			 *
-			 * This represents how much of VRAM the CPU can access
-			 * via the VRAM BAR.
-			 * On systems that do not support large BAR IO space,
-			 * this can be smaller than the actual memory size, in
-			 * which case only part of VRAM is CPU accessible
-			 * (typically the first 256M).  This configuration is
-			 * known as small-bar.
-			 */
-			resource_size_t io_size;
-			/** @size: Total size of VRAM */
-			resource_size_t size;
-			/** @base: Offset to apply for Device Physical Address control */
-			resource_size_t base;
-			/** @mapping: pointer to VRAM mappable space */
-			void *__iomem mapping;
-		} vram;
+		struct xe_mem_region vram;
 		/** @sys_mgr: system TTM manager */
 		struct ttm_resource_manager sys_mgr;
 	} mem;

drivers/gpu/drm/xe/xe_migrate.c

@@ -264,7 +264,7 @@ static int xe_migrate_prepare_vm(struct xe_tile *tile, struct xe_migrate *m,
 		 * Use 1GB pages, it shouldn't matter the physical amount of
 		 * vram is less, when we don't access it.
 		 */
-		for (pos = 0; pos < xe->mem.vram.size; pos += SZ_1G, ofs += 8)
+		for (pos = 0; pos < xe->mem.vram.actual_physical_size; pos += SZ_1G, ofs += 8)
 			xe_map_wr(xe, &bo->vmap, ofs, u64, pos | flags);
 	}
 

drivers/gpu/drm/xe/xe_mmio.c

@@ -173,7 +173,8 @@ static int xe_determine_lmem_bar_size(struct xe_device *xe)
 	if (!xe->mem.vram.io_size)
 		return -EIO;
 
-	xe->mem.vram.base = 0; /* DPA offset */
+	/* XXX: Need to change when xe link code is ready */
+	xe->mem.vram.dpa_base = 0;
 
 	/* set up a map to the total memory area. */
 	xe->mem.vram.mapping = ioremap_wc(xe->mem.vram.io_start, xe->mem.vram.io_size);
@@ -281,7 +282,7 @@ int xe_mmio_probe_vram(struct xe_device *xe)
 			return -ENODEV;
 		}
 
-		tile->mem.vram.base = tile_offset;
+		tile->mem.vram.dpa_base = xe->mem.vram.dpa_base + tile_offset;
 		tile->mem.vram.usable_size = vram_size;
 		tile->mem.vram.mapping = xe->mem.vram.mapping + tile_offset;
 
@@ -304,10 +305,10 @@ int xe_mmio_probe_vram(struct xe_device *xe)
 		io_size -= min_t(u64, tile_size, io_size);
 	}
 
-	xe->mem.vram.size = total_size;
+	xe->mem.vram.actual_physical_size = total_size;
 
 	drm_info(&xe->drm, "Total VRAM: %pa, %pa\n", &xe->mem.vram.io_start,
-		 &xe->mem.vram.size);
+		 &xe->mem.vram.actual_physical_size);
 	drm_info(&xe->drm, "Available VRAM: %pa, %pa\n", &xe->mem.vram.io_start,
 		 &available_size);