drm/ttm: Rework validation & memory space allocation (V3)

This change allow driver to pass sorted memory placement,
from most prefered placement to least prefered placement.
In order to avoid long function prototype a structure is
used to gather memory placement informations such as range
restriction (if you need a buffer to be in given range).
Range restriction is determined by fpfn & lpfn which are
the first page and last page number btw which allocation
can happen. If those fields are set to 0 ttm will assume
buffer can be put anywhere in the address space (thus it
avoids putting a burden on the driver to always properly
set those fields).

This patch also factor few functions like evicting first
entry of lru list or getting a memory space. This avoid
code duplication.

V2: Change API to use placement flags and array instead
    of packing placement order into a quadword.
V3: Make sure we set the appropriate mem.placement flag
    when validating or allocation memory space.

[Pending Thomas Hellstrom further review but okay
from preliminary review so far].

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 5 insertions, 15 deletions

diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 7a39ab9..fa5c9e5 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -242,12 +242,6 @@ struct ttm_mem_type_manager {
 /**
  * struct ttm_bo_driver
  *
- * @mem_type_prio: Priority array of memory types to place a buffer object in
- * if it fits without evicting buffers from any of these memory types.
- * @mem_busy_prio: Priority array of memory types to place a buffer object in
- * if it needs to evict buffers to make room.
- * @num_mem_type_prio: Number of elements in the @mem_type_prio array.
- * @num_mem_busy_prio: Number of elements in the @num_mem_busy_prio array.
  * @create_ttm_backend_entry: Callback to create a struct ttm_backend.
  * @invalidate_caches: Callback to invalidate read caches when a buffer object
  * has been evicted.
@@ -265,11 +259,6 @@ struct ttm_mem_type_manager {
  */
 
 struct ttm_bo_driver {
-	const uint32_t *mem_type_prio;
-	const uint32_t *mem_busy_prio;
-	uint32_t num_mem_type_prio;
-	uint32_t num_mem_busy_prio;
-
 	/**
 	 * struct ttm_bo_driver member create_ttm_backend_entry
 	 *
@@ -306,7 +295,8 @@ struct ttm_bo_driver {
 	 * finished, they'll end up in bo->mem.flags
 	 */
 
-	 uint32_t(*evict_flags) (struct ttm_buffer_object *bo);
+	 void(*evict_flags) (struct ttm_buffer_object *bo,
+				struct ttm_placement *placement);
 	/**
 	 * struct ttm_bo_driver member move:
 	 *
@@ -651,9 +641,9 @@ extern bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev,
  * -ERESTART: An interruptible sleep was interrupted by a signal.
  */
 extern int ttm_bo_mem_space(struct ttm_buffer_object *bo,
-			    uint32_t proposed_placement,
-			    struct ttm_mem_reg *mem,
-			    bool interruptible, bool no_wait);
+				struct ttm_placement *placement,
+				struct ttm_mem_reg *mem,
+				bool interruptible, bool no_wait);
 /**
  * ttm_bo_wait_for_cpu
  *