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i965: Always try to create a logical context 

Always enable use of HW logical contexts to preserve GPU state between
batches when the kernel supports such constructs, continuing to enforce
the required support for gen6+.

At runtime, this effectively removes the BRW_NEW_CONTEXT flag (and the
upload of invariant state) from the start of every batch for any kernel
supporting contexts. So long as the older atoms are correctly listening
to the right flag (NEW_CONTEXT rather than NEW_BATCH) this should
eliminate a few redundant state uploads for the older platforms.

No piglits were harmed on ctg and ilk, both with and without logical
contexts.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Chris Wilson 2017-12-15 13:42:25 +00:00 committed by Kenneth Graunke
parent e17d0ccbbd
commit b5e266765a
1 changed files with 14 additions and 15 deletions
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29
src/mesa/drivers/dri/i965/brw_context.c
View File

@ -989,22 +989,21 @@ brwCreateContext(gl_api api,
intel_batchbuffer_init(brw);
if (devinfo->gen >= 6) {
/* Create a new hardware context. Using a hardware context means that
* our GPU state will be saved/restored on context switch, allowing us
* to assume that the GPU is in the same state we left it in.
*
* This is required for transform feedback buffer offsets, query objects,
* and also allows us to reduce how much state we have to emit.
*/
brw->hw_ctx = brw_create_hw_context(brw->bufmgr);
if (!brw->hw_ctx) {
fprintf(stderr, "Failed to create hardware context.\n");
intelDestroyContext(driContextPriv);
return false;
}
/* Create a new hardware context. Using a hardware context means that
* our GPU state will be saved/restored on context switch, allowing us
* to assume that the GPU is in the same state we left it in.
*
* This is required for transform feedback buffer offsets, query objects,
* and also allows us to reduce how much state we have to emit.
*/
brw->hw_ctx = brw_create_hw_context(brw->bufmgr);
if (!brw->hw_ctx && devinfo->gen >= 6) {
fprintf(stderr, "Failed to create hardware context.\n");
intelDestroyContext(driContextPriv);
return false;
}
if (brw->hw_ctx) {
int hw_priority = GEN_CONTEXT_MEDIUM_PRIORITY;
if (ctx_config->attribute_mask & __DRIVER_CONTEXT_ATTRIB_PRIORITY) {
switch (ctx_config->priority) {