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panfrost: Subdivide fixed-size transient slabs 

The whole purpose of the transient memory model is to make subdivision
stupidly easy, so let's handle that.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
This commit is contained in:
Alyssa Rosenzweig 2019-07-12 13:59:35 -07:00
parent 37097b2f38
commit ee32700f37
3 changed files with 21 additions and 5 deletions
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22
src/gallium/drivers/panfrost/pan_allocate.c
View File

@ -96,8 +96,21 @@ panfrost_allocate_transient(struct panfrost_context *ctx, size_t sz)
unsigned offset = 0;
bool update_offset = false;
if (sz < TRANSIENT_SLAB_SIZE) {
/* First, look for a free slot */
bool has_current = batch->transient_indices.size;
bool fits_in_current = (batch->transient_offset + sz) < TRANSIENT_SLAB_SIZE;
if (likely(has_current && fits_in_current)) {
/* We can reuse the topmost BO, so get it */
unsigned idx = util_dynarray_top(&batch->transient_indices, unsigned);
bo = pan_bo_for_index(screen, idx);
/* Use the specified offset */
offset = batch->transient_offset;
update_offset = true;
} else if (sz < TRANSIENT_SLAB_SIZE) {
/* We can't reuse the topmost BO, but we can get a new one.
* First, look for a free slot */
unsigned count = util_dynarray_num_elements(&screen->transient_bo, void *);
unsigned index = 0;
@ -134,9 +147,8 @@ panfrost_allocate_transient(struct panfrost_context *ctx, size_t sz)
.gpu = bo->gpu + offset,
};
if (update_offset) {
/* TODO: Update the offset */
}
if (update_offset)
batch->transient_offset = offset + sz;
return ret;

1
src/gallium/drivers/panfrost/pan_job.c
View File

@ -42,6 +42,7 @@ panfrost_create_job(struct panfrost_context *ctx)
job->minx = job->miny = ~0;
job->maxx = job->maxy = 0;
job->transient_offset = 0;
util_dynarray_init(&job->headers, job);
util_dynarray_init(&job->gpu_headers, job);

3
src/gallium/drivers/panfrost/pan_job.h
View File

@ -109,6 +109,9 @@ struct panfrost_job {
/* Indices of transient BOs referenced */
struct util_dynarray transient_indices;
/* Within the topmost transient BO, how much has been used? */
unsigned transient_offset;
};
/* Functions for managing the above */