drm/i915: add io_size plumbing

With small LMEM-BAR we need to be able to differentiate between the
total size of LMEM, and how much of it is CPU mappable. The end goal is
to be able to utilize the entire range, even if part of is it not CPU
accessible.

v2: also update intelfb_create

Signed-off-by: Matthew Auld <[e-mail]>
Cc: Thomas Hellström <[e-mail]>
Reviewed-by: Thomas Hellström <[e-mail]>
Acked-by: Nirmoy Das <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/i915/display/intel_fbdev.c

···
 		struct intel_memory_region *mem = obj->mm.region;
 
 		info->apertures->ranges[0].base = mem->io_start;
-		info->apertures->ranges[0].size = mem->total;
+		info->apertures->ranges[0].size = mem->io_size;
 
 		/* Use fbdev's framebuffer from lmem for discrete */
 		info->fix.smem_start =

drivers/gpu/drm/i915/gem/i915_gem_shmem.c

···
 {
 	return intel_memory_region_create(i915, 0,
 					  totalram_pages() << PAGE_SHIFT,
-					  PAGE_SIZE, 0,
+					  PAGE_SIZE, 0, 0,
 					  type, instance,
 					  &shmem_region_ops);
 }

drivers/gpu/drm/i915/gem/i915_gem_stolen.c

···
 
 	/* Exclude the reserved region from driver use */
 	mem->region.end = reserved_base - 1;
+	mem->io_size = resource_size(&mem->region);
 
 	/* It is possible for the reserved area to end before the end of stolen
 	 * memory, so just consider the start. */
···
 
 	if (!io_mapping_init_wc(&mem->iomap,
 				mem->io_start,
-				resource_size(&mem->region)))
+				mem->io_size))
 		return -EIO;
 
 	/*
···
 						I915_GTT_PAGE_SIZE_4K;
 
 	mem = intel_memory_region_create(i915, lmem_base, lmem_size,
-					 min_page_size, io_start,
+					 min_page_size,
+					 io_start, lmem_size,
 					 type, instance,
 					 &i915_region_stolen_lmem_ops);
 	if (IS_ERR(mem))
···
 	mem = intel_memory_region_create(i915,
 					 intel_graphics_stolen_res.start,
 					 resource_size(&intel_graphics_stolen_res),
-					 PAGE_SIZE, 0, type, instance,
+					 PAGE_SIZE, 0, 0, type, instance,
 					 &i915_region_stolen_smem_ops);
 	if (IS_ERR(mem))
 		return mem;

drivers/gpu/drm/i915/gem/i915_gem_ttm.c

···
 
 	mr = intel_memory_region_create(i915, 0,
 					totalram_pages() << PAGE_SHIFT,
-					PAGE_SIZE, 0,
+					PAGE_SIZE, 0, 0,
 					type, instance,
 					&ttm_system_region_ops);
 	if (IS_ERR(mr))

drivers/gpu/drm/i915/gem/selftests/huge_pages.c

···
 	int bit;
 	int err = 0;
 
-	mem = mock_region_create(i915, 0, SZ_2G, I915_GTT_PAGE_SIZE_4K, 0);
+	mem = mock_region_create(i915, 0, SZ_2G, I915_GTT_PAGE_SIZE_4K, 0, 0);
 	if (IS_ERR(mem)) {
 		pr_err("%s failed to create memory region\n", __func__);
 		return PTR_ERR(mem);

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

···
 
 	if (!io_mapping_init_wc(&mem->iomap,
 				mem->io_start,
-				resource_size(&mem->region)))
+				mem->io_size))
 		return -EIO;
 
 	ret = intel_region_ttm_init(mem);
···
 					 lmem_size,
 					 min_page_size,
 					 io_start,
+					 lmem_size,
 					 INTEL_MEMORY_LOCAL,
 					 0,
 					 &intel_region_lmem_ops);
···
 	drm_dbg(&i915->drm, "Local memory: %pR\n", &mem->region);
 	drm_dbg(&i915->drm, "Local memory IO start: %pa\n",
 		&mem->io_start);
+	drm_info(&i915->drm, "Local memory IO size: %pa\n",
+		 &mem->io_size);
 	drm_info(&i915->drm, "Local memory available: %pa\n",
 		 &lmem_size);
 

drivers/gpu/drm/i915/intel_memory_region.c

···
 	resource_size_t last, page;
 	int err;
 
-	if (resource_size(&mem->region) < PAGE_SIZE)
+	if (mem->io_size < PAGE_SIZE)
 		return 0;
 
-	last = resource_size(&mem->region) - PAGE_SIZE;
+	last = mem->io_size - PAGE_SIZE;
 
 	/*
 	 * Quick test to check read/write access to the iomap (backing store).
···
 			   resource_size_t size,
 			   resource_size_t min_page_size,
 			   resource_size_t io_start,
+			   resource_size_t io_size,
 			   u16 type,
 			   u16 instance,
 			   const struct intel_memory_region_ops *ops)
···
 	mem->i915 = i915;
 	mem->region = (struct resource)DEFINE_RES_MEM(start, size);
 	mem->io_start = io_start;
+	mem->io_size = io_size;
 	mem->min_page_size = min_page_size;
 	mem->ops = ops;
 	mem->total = size;

drivers/gpu/drm/i915/intel_memory_region.h

···
 	struct resource region;
 
 	resource_size_t io_start;
+	resource_size_t io_size;
 	resource_size_t min_page_size;
 	resource_size_t total;
 	resource_size_t avail;
···
 			   resource_size_t size,
 			   resource_size_t min_page_size,
 			   resource_size_t io_start,
+			   resource_size_t io_size,
 			   u16 type,
 			   u16 instance,
 			   const struct intel_memory_region_ops *ops);

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

···
 	if (!order)
 		return 0;
 
-	mem = mock_region_create(i915, 0, SZ_2G, I915_GTT_PAGE_SIZE_4K, 0);
+	mem = mock_region_create(i915, 0, SZ_2G, I915_GTT_PAGE_SIZE_4K, 0, 0);
 	if (IS_ERR(mem)) {
 		pr_err("failed to create memory region\n");
 		err = PTR_ERR(mem);
···
 	 */
 
 	size = (SZ_4G - 1) & PAGE_MASK;
-	mem = mock_region_create(i915, 0, size, PAGE_SIZE, 0);
+	mem = mock_region_create(i915, 0, size, PAGE_SIZE, 0, 0);
 	if (IS_ERR(mem))
 		return PTR_ERR(mem);
 
···
 	 */
 
 	size = SZ_8G;
-	mem = mock_region_create(i915, 0, size, PAGE_SIZE, 0);
+	mem = mock_region_create(i915, 0, size, PAGE_SIZE, 0, 0);
 	if (IS_ERR(mem))
 		return PTR_ERR(mem);
 
···
 	if (!i915)
 		return -ENOMEM;
 
-	mem = mock_region_create(i915, 0, SZ_2G, I915_GTT_PAGE_SIZE_4K, 0);
+	mem = mock_region_create(i915, 0, SZ_2G, I915_GTT_PAGE_SIZE_4K, 0, 0);
 	if (IS_ERR(mem)) {
 		pr_err("failed to create memory region\n");
 		err = PTR_ERR(mem);

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

···
 		   resource_size_t start,
 		   resource_size_t size,
 		   resource_size_t min_page_size,
-		   resource_size_t io_start)
+		   resource_size_t io_start,
+		   resource_size_t io_size)
 {
 	int instance = ida_alloc_max(&i915->selftest.mock_region_instances,
 				     TTM_NUM_MEM_TYPES - TTM_PL_PRIV - 1,
···
 		return ERR_PTR(instance);
 
 	return intel_memory_region_create(i915, start, size, min_page_size,
-					  io_start, INTEL_MEMORY_MOCK, instance,
+					  io_start, io_size,
+					  INTEL_MEMORY_MOCK, instance,
 					  &mock_region_ops);
 }

drivers/gpu/drm/i915/selftests/mock_region.h

···
 		   resource_size_t start,
 		   resource_size_t size,
 		   resource_size_t min_page_size,
-		   resource_size_t io_start);
+		   resource_size_t io_start,
+		   resource_size_t io_size);
 
 #endif /* !__MOCK_REGION_H */