On 1/26/22 16:21, Matthew Auld wrote:
Track the total amount of available visible memory, and also track
per-resource the amount of used visible memory. For now this is useful
for our debug output, and deciding if it is even worth calling into the
buddy allocator. In the future tracking the per-resource visible usage
will be useful for when deciding if we should attempt to evict certain
buffers.
Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
Cc: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_ttm_buddy_manager.c | 55 ++++++++++++++++++-
drivers/gpu/drm/i915/i915_ttm_buddy_manager.h | 8 ++-
drivers/gpu/drm/i915/intel_region_ttm.c | 1 +
3 files changed, 62 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
index 53eb100688a6..6e5842155898 100644
--- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
+++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
@@ -19,6 +19,8 @@ struct i915_ttm_buddy_manager {
struct drm_buddy mm;
struct list_head reserved;
struct mutex lock;
+ unsigned long visible_size;
+ unsigned long visible_avail;
u64 default_page_size;
};
@@ -87,6 +89,13 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
n_pages = size >> ilog2(mm->chunk_size);
mutex_lock(&bman->lock);
+ if (place->lpfn && place->lpfn <= bman->visible_size &&
+ n_pages > bman->visible_avail) {
+ mutex_unlock(&bman->lock);
+ err = -ENOSPC;
+ goto err_free_res;
+ }
+
err = drm_buddy_alloc_blocks(mm, (u64)place->fpfn << PAGE_SHIFT,
(u64)lpfn << PAGE_SHIFT,
(u64)n_pages << PAGE_SHIFT,
@@ -107,6 +116,30 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
mutex_unlock(&bman->lock);
}
+ if (place->lpfn && place->lpfn <= bman->visible_size) {
+ bman_res->used_visible_size = bman_res->base.num_pages;
+ } else {
+ struct drm_buddy_block *block;
+
+ list_for_each_entry(block, &bman_res->blocks, link) {
+ unsigned long start =
+ drm_buddy_block_offset(block) >> PAGE_SHIFT;
+ unsigned long end = start +
+ (drm_buddy_block_size(mm, block) >> PAGE_SHIFT);
+
Move this inside the if statement below? Or perhaps the compiler is
smart enough to figure that out.
+ if (start < bman->visible_size) {
+ bman_res->used_visible_size +=
+ min(end, bman->visible_size) - start;
+ }
+ }
+ }
Reviewed-by: Thomas Hellstrom <thomas.hellstrom@xxxxxxxxxxxxxxx>
