Commit 99b47aad authored by Matthew Brost's avatar Matthew Brost Committed by John Harrison
Browse files

drm/i915/guc: Implement parallel context pin / unpin functions 



Parallel contexts are perma-pinned by the upper layers which makes the
backend implementation rather simple. The parent pins the guc_id and
children increment the parent's pin count on pin to ensure all the
contexts are unpinned before we disable scheduling with the GuC / or
deregister the context.

v2:
 (Daniel Vetter)
  - Perma-pin parallel contexts

Signed-off-by: default avatarMatthew Brost <matthew.brost@intel.com>
Reviewed-by: default avatarJohn Harrison <John.C.Harrison@Intel.com>
Signed-off-by: default avatarJohn Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211014172005.27155-12-matthew.brost@intel.com
parent 09c5e3a5

drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c

+70 −0
Original line number Diff line number Diff line
@@ -2584,6 +2584,76 @@ static const struct intel_context_ops virtual_guc_context_ops = { 
	.get_sibling = guc_virtual_get_sibling,

};



/* Future patches will use this function */

__maybe_unused

static int guc_parent_context_pin(struct intel_context *ce, void *vaddr)

{

	struct intel_engine_cs *engine = guc_virtual_get_sibling(ce->engine, 0);

	struct intel_guc *guc = ce_to_guc(ce);

	int ret;



	GEM_BUG_ON(!intel_context_is_parent(ce));

	GEM_BUG_ON(!intel_engine_is_virtual(ce->engine));



	ret = pin_guc_id(guc, ce);

	if (unlikely(ret < 0))

		return ret;



	return __guc_context_pin(ce, engine, vaddr);

}



/* Future patches will use this function */

__maybe_unused

static int guc_child_context_pin(struct intel_context *ce, void *vaddr)

{

	struct intel_engine_cs *engine = guc_virtual_get_sibling(ce->engine, 0);



	GEM_BUG_ON(!intel_context_is_child(ce));

	GEM_BUG_ON(!intel_engine_is_virtual(ce->engine));



	__intel_context_pin(ce->parallel.parent);

	return __guc_context_pin(ce, engine, vaddr);

}



/* Future patches will use this function */

__maybe_unused

static void guc_parent_context_unpin(struct intel_context *ce)

{

	struct intel_guc *guc = ce_to_guc(ce);



	GEM_BUG_ON(context_enabled(ce));

	GEM_BUG_ON(intel_context_is_barrier(ce));

	GEM_BUG_ON(!intel_context_is_parent(ce));

	GEM_BUG_ON(!intel_engine_is_virtual(ce->engine));



	unpin_guc_id(guc, ce);

	lrc_unpin(ce);

}



/* Future patches will use this function */

__maybe_unused

static void guc_child_context_unpin(struct intel_context *ce)

{

	GEM_BUG_ON(context_enabled(ce));

	GEM_BUG_ON(intel_context_is_barrier(ce));

	GEM_BUG_ON(!intel_context_is_child(ce));

	GEM_BUG_ON(!intel_engine_is_virtual(ce->engine));



	lrc_unpin(ce);

}



/* Future patches will use this function */

__maybe_unused

static void guc_child_context_post_unpin(struct intel_context *ce)

{

	GEM_BUG_ON(!intel_context_is_child(ce));

	GEM_BUG_ON(!intel_context_is_pinned(ce->parallel.parent));

	GEM_BUG_ON(!intel_engine_is_virtual(ce->engine));



	lrc_post_unpin(ce);

	intel_context_unpin(ce->parallel.parent);

}



static bool

guc_irq_enable_breadcrumbs(struct intel_breadcrumbs *b)

{