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drm/i915/gt: Schedule request retirement when signaler idles 

Very similar to commit 4f88f8747f ("drm/i915/gt: Schedule request
retirement when timeline idles"), but this time instead of coupling into
the execlists CS event interrupt, we couple into the breadcrumb
interrupt and queue a timeline's retirement when the last signaler is
completed. This should allow us to more rapidly park ringbuffer
submission, and so help reduce power consumption on older systems.

v2: Fixup intel_engine_add_retire() to handle concurrent callers

References: 4f88f8747f ("drm/i915/gt: Schedule request retirement when timeline idles")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191219124353.8607-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-12-19 12:43:52 +00:00
parent cabeacd4cc
commit dc93c9b693
3 changed files with 8 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/drm/i915/gt/intel_breadcrumbs.c
View File

@ -29,6 +29,7 @@
#include "i915_drv.h"
#include "i915_trace.h"
#include "intel_gt_pm.h"
#include "intel_gt_requests.h"
static void irq_enable(struct intel_engine_cs *engine)
{
@ -179,8 +180,11 @@ static void signal_irq_work(struct irq_work *work)
if (!list_is_first(pos, &ce->signals)) {
/* Advance the list to the first incomplete request */
__list_del_many(&ce->signals, pos);
if (&ce->signals == pos) /* now empty */
if (&ce->signals == pos) { /* now empty */
list_del_init(&ce->signal_link);
intel_engine_add_retire(ce->engine,
ce->timeline);
}
}
}

7
drivers/gpu/drm/i915/gt/intel_gt_requests.c
View File

@ -62,19 +62,16 @@ static void engine_retire(struct work_struct *work)
static bool add_retire(struct intel_engine_cs *engine,
struct intel_timeline *tl)
{
#define STUB ((struct intel_timeline *)1)
struct intel_timeline *first;
/*
* We open-code a llist here to include the additional tag [BIT(0)]
* so that we know when the timeline is already on a
* retirement queue: either this engine or another.
*
* However, we rely on that a timeline can only be active on a single
* engine at any one time and that add_retire() is called before the
* engine releases the timeline and transferred to another to retire.
*/
if (READ_ONCE(tl->retire)) /* already queued */
if (cmpxchg(&tl->retire, NULL, STUB)) /* already queued */
return false;
intel_timeline_get(tl);

2
drivers/gpu/drm/i915/gt/intel_lrc.c
View File

@ -4511,8 +4511,8 @@ intel_execlists_create_virtual(struct i915_gem_context *ctx,
intel_engine_init_active(&ve->base, ENGINE_VIRTUAL);
intel_engine_init_breadcrumbs(&ve->base);
intel_engine_init_execlists(&ve->base);
intel_engine_init_retire(&ve->base);
ve->base.cops = &virtual_context_ops;
ve->base.request_alloc = execlists_request_alloc;