[PATCH v2 4/6] drm/i915: Implement intersect/compatible functions
Arunpravin Paneer Selvam
arunpravin.paneerselvam at amd.com
Thu Jul 28 14:36:21 UTC 2022
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 at amd.com>
>> Signed-off-by: Arunpravin Paneer Selvam
>> <Arunpravin.PaneerSelvam at amd.com>
>> ---
>> 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,
>> };
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