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panfrost: Recycle fixed-size transient BOs

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The usual case. We use the bitset to mark freedom and seize it.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
This commit is contained in:
Alyssa Rosenzweig 2019-07-12 13:05:14 -07:00
parent 0f5ad9efcc
commit 37097b2f38
2 changed files with 26 additions and 3 deletions
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21
src/gallium/drivers/panfrost/pan_allocate.c
View file

@ -97,12 +97,27 @@ panfrost_allocate_transient(struct panfrost_context *ctx, size_t sz)
bool update_offset = false;
if (sz < TRANSIENT_SLAB_SIZE) {
/* TODO: Lookup free */
/* First, look for a free slot */
unsigned count = util_dynarray_num_elements(&screen->transient_bo, void *);
unsigned index = 0;
if (!bo)
unsigned free = __bitset_ffs(
screen->free_transient,
count / BITSET_WORDBITS);
if (likely(free)) {
/* Use this one */
index = free - 1;
/* It's ours, so no longer free */
BITSET_CLEAR(screen->free_transient, index);
/* Grab the BO */
bo = pan_bo_for_index(screen, index);
} else {
/* Otherwise, create a new BO */
bo = panfrost_create_slab(screen, &index);
}
/* Remember we created this */
util_dynarray_append(&batch->transient_indices, unsigned, index);

8
src/gallium/drivers/panfrost/pan_job.c
View file

@ -61,6 +61,14 @@ panfrost_free_job(struct panfrost_context *ctx, struct panfrost_job *job)
panfrost_bo_unreference(ctx->base.screen, bo);
}
/* Free up the transient BOs we're sitting on */
struct panfrost_screen *screen = pan_screen(ctx->base.screen);
util_dynarray_foreach(&job->transient_indices, unsigned, index) {
/* Mark it free */
BITSET_SET(screen->free_transient, *index);
}
_mesa_hash_table_remove_key(ctx->jobs, &job->key);
if (ctx->job == job)