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sna: gen4+ suffer no penalty for changing tiling 

On gen4, the tiling/fence constraints are fairly lax, only requiring
page alignment of the object and its size, and so we can switch
tiling modes without incurring a GPU stall on active bo.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2012-02-20 16:30:53 +00:00
parent b68b76cf54
commit dbe0580e20
1 changed files with 53 additions and 8 deletions
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61
src/sna/kgem.c
View File

@ -2403,15 +2403,28 @@ search_again:
assert(bo->reusable);
assert(bo->tiling == tiling);
if (bo->pitch < pitch) {
DBG(("tiled and pitch too small: tiling=%d, (want %d), pitch=%d, need %d\n",
bo->tiling, tiling,
bo->pitch, pitch));
continue;
}
if (kgem->gen < 40) {
if (bo->pitch < pitch) {
DBG(("tiled and pitch too small: tiling=%d, (want %d), pitch=%d, need %d\n",
bo->tiling, tiling,
bo->pitch, pitch));
continue;
}
if (bo->pitch * tiled_height > bytes(bo))
continue;
if (bo->pitch * tiled_height > bytes(bo))
continue;
} else {
if (num_pages(bo) < size)
continue;
if (bo->pitch != pitch) {
gem_set_tiling(kgem->fd,
bo->handle,
tiling, pitch);
bo->pitch = pitch;
}
}
kgem_bo_remove_from_active(kgem, bo);
@ -2444,6 +2457,38 @@ search_again:
}
if (--retry && flags & CREATE_EXACT) {
if (kgem->gen >= 40) {
for (i = I915_TILING_NONE; i <= I915_TILING_Y; i++) {
if (i == tiling)
continue;
cache = &kgem->active[bucket][i];
list_for_each_entry(bo, cache, list) {
assert(!bo->purged);
assert(bo->refcnt == 0);
assert(bo->reusable);
if (num_pages(bo) < size)
continue;
if (tiling != gem_set_tiling(kgem->fd,
bo->handle,
tiling, pitch))
continue;
kgem_bo_remove_from_active(kgem, bo);
bo->unique_id = kgem_get_unique_id(kgem);
bo->pitch = pitch;
bo->tiling = tiling;
bo->delta = 0;
DBG((" 1:from active: pitch=%d, tiling=%d, handle=%d, id=%d\n",
bo->pitch, bo->tiling, bo->handle, bo->unique_id));
return kgem_bo_reference(bo);
}
}
}
bucket++;
goto search_again;
}