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drm/i915: Support LRC context single submission

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This patch introduces the support of LRC context single submission.
As GVT context may come from different guests, which require different
configuration of render registers. It can't be combined into a dual ELSP
submission combo.

Only GVT-g will create this kinds of GEM context currently.

v8:

- Rename the data member in struct i915_gem_context. (Chris)

v7:

- Fix typos in commit message. (Joonas)

v6:
- Make GVT code as dead code when !CONFIG_DRM_I915_GVT. (Chris)

v5:

- Only compile this feature when CONFIG_DRM_I915_GVT=y. (Tvrtko)

Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1466078825-6662-9-git-send-email-zhi.a.wang@intel.com
This commit is contained in:
Zhi Wang 2016-06-16 08:07:04 -04:00 committed by Chris Wilson
parent 3c7ba6359d
commit 80a9a8db16
2 changed files with 15 additions and 0 deletions
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1
drivers/gpu/drm/i915/i915_drv.h
View File

@ -883,6 +883,7 @@ struct i915_gem_context {
u32 ring_size;
u32 desc_template;
struct atomic_notifier_head status_notifier;
bool execlists_force_single_submission;
struct list_head link;

14
drivers/gpu/drm/i915/intel_lrc.c
View File

@ -444,6 +444,20 @@ static void execlists_context_unqueue(struct intel_engine_cs *engine)
i915_gem_request_unreference(req0);
req0 = cursor;
} else {
if (IS_ENABLED(CONFIG_DRM_I915_GVT)) {
/*
* req0 (after merged) ctx requires single
* submission, stop picking
*/
if (req0->ctx->execlists_force_single_submission)
break;
/*
* req0 ctx doesn't require single submission,
* but next req ctx requires, stop picking
*/
if (cursor->ctx->execlists_force_single_submission)
break;
}
req1 = cursor;
WARN_ON(req1->elsp_submitted);
break;