Commit e30f3963 authored by Thomas Hellstrom's avatar Thomas Hellstrom
Browse files

drm/ttm: Fix memory space allocation v2 



In the event that TTM doesn't find a compatible memory type for the
driver's first placement choice (placement without eviction), TTM
returns -EINVAL without trying the driver's second choice.
This causes problems on vmwgfx when VRAM is disabled before first modeset
and during VT switches when fbdev is not enabled.

Fix this by also trying the driver's second choice before returning
-EINVAL.

v2: Also check that man->use_type is true for the driver's second choice.
Fixes a bug where disallowed memory types could be used.

Signed-off-by: default avatarThomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: default avatarBrian Paul <brianp@vmware.com>
Reviewed-by: default avatarSinclair Yeh <syeh@vmware.com>
parent 2e586a7e

drivers/gpu/drm/ttm/ttm_bo.c

+16 −12
Original line number Diff line number Diff line
@@ -882,6 +882,8 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo, 
		if (ret)

			return ret;

		man = &bdev->man[mem_type];

		if (!man->has_type || !man->use_type)

			continue;



		type_ok = ttm_bo_mt_compatible(man, mem_type, place,

						&cur_flags);
@@ -889,6 +891,7 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo, 
		if (!type_ok)

			continue;



		type_found = true;

		cur_flags = ttm_bo_select_caching(man, bo->mem.placement,

						  cur_flags);

		/*
@@ -901,12 +904,10 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo, 
		if (mem_type == TTM_PL_SYSTEM)

			break;



		if (man->has_type && man->use_type) {

			type_found = true;

		ret = (*man->func->get_node)(man, bo, place, mem);

		if (unlikely(ret))

			return ret;

		}

		

		if (mem->mm_node)

			break;

	}
@@ -917,9 +918,6 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo, 
		return 0;

	}



	if (!type_found)

		return -EINVAL;



	for (i = 0; i < placement->num_busy_placement; ++i) {

		const struct ttm_place *place = &placement->busy_placement[i];
@@ -927,11 +925,12 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo, 
		if (ret)

			return ret;

		man = &bdev->man[mem_type];

		if (!man->has_type)

		if (!man->has_type || !man->use_type)

			continue;

		if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))

			continue;



		type_found = true;

		cur_flags = ttm_bo_select_caching(man, bo->mem.placement,

						  cur_flags);

		/*
@@ -957,8 +956,13 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo, 
		if (ret == -ERESTARTSYS)

			has_erestartsys = true;

	}

	ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;

	return ret;



	if (!type_found) {

		printk(KERN_ERR TTM_PFX "No compatible memory type found.\n");

		return -EINVAL;

	}



	return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;

}

EXPORT_SYMBOL(ttm_bo_mem_space);

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