Hi Matthew,
On 7/26/2022 4:11 PM, Matthew Auld wrote:
On 25/07/2022 12:42, Arunpravin Paneer Selvam wrote:
Implemented a new intersect and compatible callback function
fetching start offset from drm buddy allocator.
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Arunpravin Paneer Selvam
<Arunpravin.PaneerSelvam@xxxxxxx>
---
drivers/gpu/drm/i915/i915_ttm_buddy_manager.c | 43 +++++++++++++++++++
1 file changed, 43 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
index a5109548abc0..b5801c05bd41 100644
--- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
+++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
@@ -178,6 +178,47 @@ static void i915_ttm_buddy_man_free(struct
ttm_resource_manager *man,
kfree(bman_res);
}
+static bool i915_ttm_buddy_man_intersect(struct
ttm_resource_manager *man,
+ struct ttm_resource *res,
+ const struct ttm_place *place,
+ size_t size)
+{
+ struct i915_ttm_buddy_resource *bman_res =
to_ttm_buddy_resource(res);
+ u32 start, num_pages = PFN_UP(size);
+ struct drm_buddy_block *block;
+
+ /* Check each drm buddy block individually */
+ list_for_each_entry(block, &bman_res->blocks, link) {
+ start = drm_buddy_block_offset(block) >> PAGE_SHIFT;
+ /* Don't evict BOs outside of the requested placement range */
+ if (place->fpfn >= (start + num_pages) ||
+ (place->lpfn && place->lpfn <= start))
+ return false;
+ }
+
+ return true;
+}
This looks like a nice idea. We should be able to clean up
i915_ttm_eviction_valuable() a fair bit I think, if we now call
ttm_bo_eviction_valuable() at the end (like in amdgpu), and move the
bits that are specific to buddy_man here?
So something like:
if (!place->fpfn && !place->lpfn)
return true;
if (!place->fpfn &&
place->lpfn == i915_buddy_man_visible_size(man))
return bman_res->used_visible_size > 0;
/* Check each drm buddy block individually */
....
modified in v3
+
+static bool i915_ttm_buddy_man_compatible(struct
ttm_resource_manager *man,
+ struct ttm_resource *res,
+ const struct ttm_place *place,
+ size_t size)
Is it not possible to derive the size from res->num_pages?
I think it is possible, I will check with Christian for any specific
case that might
require ttm_buffer_object->base.size
+{
+ struct i915_ttm_buddy_resource *bman_res =
to_ttm_buddy_resource(res);
+ u32 start, num_pages = PFN_UP(size);
+ struct drm_buddy_block *block;
+
+ /* Check each drm buddy block individually */
+ list_for_each_entry(block, &bman_res->blocks, link) {
+ start = drm_buddy_block_offset(block) >> PAGE_SHIFT;
+ if (start < place->fpfn ||
+ (place->lpfn && (start + num_pages) > place->lpfn))
+ return false;
+ }
if (!place->fpfn && !place->lpfn)
return true;
if (!place->fpfn &&
place->lpfn == i915_buddy_man_visible_size(man))
return bman_res->used_visible_size == res->num_pages;
/* Check each drm buddy block individually */
...
modified in v3
+
+ return true;
+}
+
static void i915_ttm_buddy_man_debug(struct ttm_resource_manager *man,
struct drm_printer *printer)
{
@@ -205,6 +246,8 @@ static void i915_ttm_buddy_man_debug(struct
ttm_resource_manager *man,
static const struct ttm_resource_manager_func
i915_ttm_buddy_manager_func = {
.alloc = i915_ttm_buddy_man_alloc,
.free = i915_ttm_buddy_man_free,
+ .intersect = i915_ttm_buddy_man_intersect,
s/intersect/intersects/ ?
okay.
+ .compatible = i915_ttm_buddy_man_compatible,
.debug = i915_ttm_buddy_man_debug,
};
