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

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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: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211014172005.27155-12-matthew.brost@intel.com
This commit is contained in:
Matthew Brost 2021-10-14 10:19:51 -07:00 committed by John Harrison
parent 09c5e3a5e5
commit 99b47aaddf
1 changed files with 70 additions and 0 deletions
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70
drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
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@ -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)
{