[PATCH 12/46] drm/i915: Extract request rewinding from execlists
Chris Wilson
chris at chris-wilson.co.uk
Sat Jan 30 12:52:03 UTC 2021
In the process of preparing to reuse the request submission logic for
other backends, lift it out of the execlists backend.
While this operates on the common structs, we do have a bit of backend
knowledge, which is harmless for !lrc but still unsightly.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/gt/intel_engine.h | 3 -
.../drm/i915/gt/intel_execlists_submission.c | 58 ++-----------------
drivers/gpu/drm/i915/gt/intel_lrc_reg.h | 3 +
drivers/gpu/drm/i915/gt/selftest_execlists.c | 2 +-
.../gpu/drm/i915/gt/uc/intel_guc_submission.c | 3 +-
drivers/gpu/drm/i915/i915_scheduler.c | 44 ++++++++++++++
drivers/gpu/drm/i915/i915_scheduler.h | 3 +
7 files changed, 56 insertions(+), 60 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
index 47ee8578e511..20974415e7d8 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine.h
@@ -136,9 +136,6 @@ execlists_active_unlock_bh(struct intel_engine_execlists *execlists)
local_bh_enable(); /* restore softirq, and kick ksoftirqd! */
}
-struct i915_request *
-execlists_unwind_incomplete_requests(struct intel_engine_execlists *execlists);
-
static inline u32
intel_read_status_page(const struct intel_engine_cs *engine, int reg)
{
diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index 50866fba8c27..78524f594327 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -359,56 +359,6 @@ assert_priority_queue(const struct i915_request *prev,
return rq_prio(prev) >= rq_prio(next);
}
-static struct i915_request *
-__unwind_incomplete_requests(struct intel_engine_cs *engine)
-{
- struct i915_request *rq, *rn, *active = NULL;
- struct list_head *pl;
- int prio = I915_PRIORITY_INVALID;
-
- lockdep_assert_held(&engine->active.lock);
-
- list_for_each_entry_safe_reverse(rq, rn,
- &engine->active.requests,
- sched.link) {
- if (__i915_request_is_complete(rq)) {
- list_del_init(&rq->sched.link);
- continue;
- }
-
- __i915_request_unsubmit(rq);
-
- GEM_BUG_ON(rq_prio(rq) == I915_PRIORITY_INVALID);
- if (rq_prio(rq) != prio) {
- prio = rq_prio(rq);
- pl = i915_sched_lookup_priolist(engine, prio);
- }
- GEM_BUG_ON(RB_EMPTY_ROOT(&engine->execlists.queue.rb_root));
-
- list_move(&rq->sched.link, pl);
- set_bit(I915_FENCE_FLAG_PQUEUE, &rq->fence.flags);
-
- /* Check in case we rollback so far we wrap [size/2] */
- if (intel_ring_direction(rq->ring,
- rq->tail,
- rq->ring->tail + 8) > 0)
- rq->context->lrc.desc |= CTX_DESC_FORCE_RESTORE;
-
- active = rq;
- }
-
- return active;
-}
-
-struct i915_request *
-execlists_unwind_incomplete_requests(struct intel_engine_execlists *execlists)
-{
- struct intel_engine_cs *engine =
- container_of(execlists, typeof(*engine), execlists);
-
- return __unwind_incomplete_requests(engine);
-}
-
static void
execlists_context_status_change(struct i915_request *rq, unsigned long status)
{
@@ -1080,7 +1030,7 @@ static void defer_active(struct intel_engine_cs *engine)
{
struct i915_request *rq;
- rq = __unwind_incomplete_requests(engine);
+ rq = __i915_sched_rewind_requests(engine);
if (!rq)
return;
@@ -1292,7 +1242,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
* the preemption, some of the unwound requests may
* complete!
*/
- __unwind_incomplete_requests(engine);
+ __i915_sched_rewind_requests(engine);
last = NULL;
} else if (timeslice_expired(engine, last)) {
@@ -2288,7 +2238,7 @@ static void execlists_capture(struct intel_engine_cs *engine)
* which we return it to the queue for signaling.
*
* By removing them from the execlists queue, we also remove the
- * requests from being processed by __unwind_incomplete_requests()
+ * requests from being processed by __intel_engine_rewind_requests()
* during the intel_engine_reset(), and so they will *not* be replayed
* afterwards.
*
@@ -2879,7 +2829,7 @@ static void execlists_reset_rewind(struct intel_engine_cs *engine, bool stalled)
/* Push back any incomplete requests for replay after the reset. */
rcu_read_lock();
spin_lock_irqsave(&engine->active.lock, flags);
- __unwind_incomplete_requests(engine);
+ __i915_sched_rewind_requests(engine);
spin_unlock_irqrestore(&engine->active.lock, flags);
rcu_read_unlock();
}
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc_reg.h b/drivers/gpu/drm/i915/gt/intel_lrc_reg.h
index 41e5350a7a05..364656bedec7 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc_reg.h
+++ b/drivers/gpu/drm/i915/gt/intel_lrc_reg.h
@@ -92,4 +92,7 @@
/* in Gen12 ID 0x7FF is reserved to indicate idle */
#define GEN12_MAX_CONTEXT_HW_ID (GEN11_MAX_CONTEXT_HW_ID - 1)
+#define CTX_DESC_RELOAD_PD BIT_ULL(1)
+#define CTX_DESC_FORCE_RESTORE BIT_ULL(2)
+
#endif /* _INTEL_LRC_REG_H_ */
diff --git a/drivers/gpu/drm/i915/gt/selftest_execlists.c b/drivers/gpu/drm/i915/gt/selftest_execlists.c
index 7d4366f0c5ba..840a9f53550b 100644
--- a/drivers/gpu/drm/i915/gt/selftest_execlists.c
+++ b/drivers/gpu/drm/i915/gt/selftest_execlists.c
@@ -4582,7 +4582,7 @@ static int reset_virtual_engine(struct intel_gt *gt,
/* Fake a preemption event; failed of course */
spin_lock_irq(&engine->active.lock);
- __unwind_incomplete_requests(engine);
+ __i915_sched_rewind_requests(engine);
spin_unlock_irq(&engine->active.lock);
GEM_BUG_ON(rq->engine != engine);
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index d5d6345876d4..7e88a7993e14 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -306,14 +306,13 @@ static void guc_reset_state(struct intel_context *ce,
static void guc_reset_rewind(struct intel_engine_cs *engine, bool stalled)
{
- struct intel_engine_execlists * const execlists = &engine->execlists;
struct i915_request *rq;
unsigned long flags;
spin_lock_irqsave(&engine->active.lock, flags);
/* Push back any incomplete requests for replay after the reset. */
- rq = execlists_unwind_incomplete_requests(execlists);
+ rq = __i915_sched_rewind_requests(engine);
if (!rq)
goto out_unlock;
diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c
index 5e99f9779309..9fcfbf303ce0 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.c
+++ b/drivers/gpu/drm/i915/i915_scheduler.c
@@ -6,6 +6,9 @@
#include <linux/mutex.h>
+#include "gt/intel_ring.h"
+#include "gt/intel_lrc_reg.h"
+
#include "i915_drv.h"
#include "i915_globals.h"
#include "i915_request.h"
@@ -542,6 +545,47 @@ void i915_request_enqueue(struct i915_request *rq)
tasklet_hi_schedule(&engine->execlists.tasklet);
}
+struct i915_request *
+__i915_sched_rewind_requests(struct intel_engine_cs *engine)
+{
+ struct i915_request *rq, *rn, *active = NULL;
+ struct list_head *pl;
+ int prio = I915_PRIORITY_INVALID;
+
+ lockdep_assert_held(&engine->active.lock);
+
+ list_for_each_entry_safe_reverse(rq, rn,
+ &engine->active.requests,
+ sched.link) {
+ if (__i915_request_is_complete(rq)) {
+ list_del_init(&rq->sched.link);
+ continue;
+ }
+
+ __i915_request_unsubmit(rq);
+
+ GEM_BUG_ON(rq_prio(rq) == I915_PRIORITY_INVALID);
+ if (rq_prio(rq) != prio) {
+ prio = rq_prio(rq);
+ pl = i915_sched_lookup_priolist(engine, prio);
+ }
+ GEM_BUG_ON(RB_EMPTY_ROOT(&engine->execlists.queue.rb_root));
+
+ list_move(&rq->sched.link, pl);
+ set_bit(I915_FENCE_FLAG_PQUEUE, &rq->fence.flags);
+
+ /* Check in case we rollback so far we wrap [size/2] */
+ if (intel_ring_direction(rq->ring,
+ rq->tail,
+ rq->ring->tail + 8) > 0)
+ rq->context->lrc.desc |= CTX_DESC_FORCE_RESTORE;
+
+ active = rq;
+ }
+
+ return active;
+}
+
void i915_sched_node_init(struct i915_sched_node *node)
{
spin_lock_init(&node->lock);
diff --git a/drivers/gpu/drm/i915/i915_scheduler.h b/drivers/gpu/drm/i915/i915_scheduler.h
index 89d998f226e0..d3984f65b3a6 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.h
+++ b/drivers/gpu/drm/i915/i915_scheduler.h
@@ -42,6 +42,9 @@ void i915_request_set_priority(struct i915_request *request, int prio);
void i915_request_enqueue(struct i915_request *request);
+struct i915_request *
+__i915_sched_rewind_requests(struct intel_engine_cs *engine);
+
struct list_head *
i915_sched_lookup_priolist(struct intel_engine_cs *engine, int prio);
--
2.20.1
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