[Intel-gfx] [PATCH 1/2] drm/i915: Strip out internal priorities
Chris Wilson
chris at chris-wilson.co.uk
Wed Jan 20 12:14:38 UTC 2021
Since we are not using any internal priority levels, and in the next few
patches will introduce a new index for which the optimisation is not so
lear cut, discard the small table within the priolist.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
.../gpu/drm/i915/gt/intel_engine_heartbeat.c | 2 +-
.../drm/i915/gt/intel_execlists_submission.c | 22 ++------
drivers/gpu/drm/i915/gt/selftest_execlists.c | 1 -
drivers/gpu/drm/i915/gt/selftest_lrc.c | 1 -
.../gpu/drm/i915/gt/uc/intel_guc_submission.c | 6 +--
drivers/gpu/drm/i915/i915_priolist_types.h | 8 +--
drivers/gpu/drm/i915/i915_scheduler.c | 51 +++----------------
drivers/gpu/drm/i915/i915_scheduler.h | 16 ++----
8 files changed, 20 insertions(+), 87 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c b/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c
index d7be2b9339f9..1732a42e9075 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c
@@ -125,7 +125,7 @@ static void heartbeat(struct work_struct *wrk)
* low latency and no jitter] the chance to naturally
* complete before being preempted.
*/
- attr.priority = I915_PRIORITY_MASK;
+ attr.priority = 0;
if (rq->sched.attr.priority >= attr.priority)
attr.priority |= I915_USER_PRIORITY(I915_PRIORITY_HEARTBEAT);
if (rq->sched.attr.priority >= attr.priority)
diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index 740ff05fd692..39c31f95d4dc 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -274,22 +274,13 @@ static int effective_prio(const struct i915_request *rq)
static int queue_prio(const struct intel_engine_execlists *execlists)
{
- struct i915_priolist *p;
struct rb_node *rb;
rb = rb_first_cached(&execlists->queue);
if (!rb)
return INT_MIN;
- /*
- * As the priolist[] are inverted, with the highest priority in [0],
- * we have to flip the index value to become priority.
- */
- p = to_priolist(rb);
- if (!I915_USER_PRIORITY_SHIFT)
- return p->priority;
-
- return ((p->priority + 1) << I915_USER_PRIORITY_SHIFT) - ffs(p->used);
+ return to_priolist(rb)->priority;
}
static int virtual_prio(const struct intel_engine_execlists *el)
@@ -1454,9 +1445,8 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
while ((rb = rb_first_cached(&execlists->queue))) {
struct i915_priolist *p = to_priolist(rb);
struct i915_request *rq, *rn;
- int i;
- priolist_for_each_request_consume(rq, rn, p, i) {
+ priolist_for_each_request_consume(rq, rn, p) {
bool merge = true;
/*
@@ -2964,9 +2954,8 @@ static void execlists_reset_cancel(struct intel_engine_cs *engine)
/* Flush the queued requests to the timeline list (for retiring). */
while ((rb = rb_first_cached(&execlists->queue))) {
struct i915_priolist *p = to_priolist(rb);
- int i;
- priolist_for_each_request_consume(rq, rn, p, i) {
+ priolist_for_each_request_consume(rq, rn, p) {
i915_request_mark_eio(rq);
__i915_request_submit(rq);
}
@@ -3240,7 +3229,7 @@ int intel_execlists_submission_setup(struct intel_engine_cs *engine)
static struct list_head *virtual_queue(struct virtual_engine *ve)
{
- return &ve->base.execlists.default_priolist.requests[0];
+ return &ve->base.execlists.default_priolist.requests;
}
static void rcu_virtual_context_destroy(struct work_struct *wrk)
@@ -3836,9 +3825,8 @@ void intel_execlists_show_requests(struct intel_engine_cs *engine,
count = 0;
for (rb = rb_first_cached(&execlists->queue); rb; rb = rb_next(rb)) {
struct i915_priolist *p = rb_entry(rb, typeof(*p), node);
- int i;
- priolist_for_each_request(rq, p, i) {
+ priolist_for_each_request(rq, p) {
if (count++ < max - 1)
show_request(m, rq, "\t\t", 0);
else
diff --git a/drivers/gpu/drm/i915/gt/selftest_execlists.c b/drivers/gpu/drm/i915/gt/selftest_execlists.c
index 264b5ebdb021..6bce45f63f37 100644
--- a/drivers/gpu/drm/i915/gt/selftest_execlists.c
+++ b/drivers/gpu/drm/i915/gt/selftest_execlists.c
@@ -1081,7 +1081,6 @@ create_rewinder(struct intel_context *ce,
intel_ring_advance(rq, cs);
- rq->sched.attr.priority = I915_PRIORITY_MASK;
err = 0;
err:
i915_request_get(rq);
diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c b/drivers/gpu/drm/i915/gt/selftest_lrc.c
index 920979a89413..693a7e2d67c9 100644
--- a/drivers/gpu/drm/i915/gt/selftest_lrc.c
+++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c
@@ -733,7 +733,6 @@ create_timestamp(struct intel_context *ce, void *slot, int idx)
intel_ring_advance(rq, cs);
- rq->sched.attr.priority = I915_PRIORITY_MASK;
err = 0;
err:
i915_request_get(rq);
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 23dc0aeaa0ab..3124d8794d87 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -206,9 +206,8 @@ static void __guc_dequeue(struct intel_engine_cs *engine)
while ((rb = rb_first_cached(&execlists->queue))) {
struct i915_priolist *p = to_priolist(rb);
struct i915_request *rq, *rn;
- int i;
- priolist_for_each_request_consume(rq, rn, p, i) {
+ priolist_for_each_request_consume(rq, rn, p) {
if (last && rq->context != last->context) {
if (port == last_port)
goto done;
@@ -361,9 +360,8 @@ static void guc_reset_cancel(struct intel_engine_cs *engine)
/* Flush the queued requests to the timeline list (for retiring). */
while ((rb = rb_first_cached(&execlists->queue))) {
struct i915_priolist *p = to_priolist(rb);
- int i;
- priolist_for_each_request_consume(rq, rn, p, i) {
+ priolist_for_each_request_consume(rq, rn, p) {
list_del_init(&rq->sched.link);
__i915_request_submit(rq);
dma_fence_set_error(&rq->fence, -EIO);
diff --git a/drivers/gpu/drm/i915/i915_priolist_types.h b/drivers/gpu/drm/i915/i915_priolist_types.h
index 8aa7866ec6b6..9a7657bb002e 100644
--- a/drivers/gpu/drm/i915/i915_priolist_types.h
+++ b/drivers/gpu/drm/i915/i915_priolist_types.h
@@ -27,11 +27,8 @@ enum {
#define I915_USER_PRIORITY_SHIFT 0
#define I915_USER_PRIORITY(x) ((x) << I915_USER_PRIORITY_SHIFT)
-#define I915_PRIORITY_COUNT BIT(I915_USER_PRIORITY_SHIFT)
-#define I915_PRIORITY_MASK (I915_PRIORITY_COUNT - 1)
-
/* Smallest priority value that cannot be bumped. */
-#define I915_PRIORITY_INVALID (INT_MIN | (u8)I915_PRIORITY_MASK)
+#define I915_PRIORITY_INVALID (INT_MIN)
/*
* Requests containing performance queries must not be preempted by
@@ -45,9 +42,8 @@ enum {
#define I915_PRIORITY_BARRIER (I915_PRIORITY_UNPREEMPTABLE - 1)
struct i915_priolist {
- struct list_head requests[I915_PRIORITY_COUNT];
+ struct list_head requests;
struct rb_node node;
- unsigned long used;
int priority;
};
diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c
index 7144239f08df..d9f4cafe5a74 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.c
+++ b/drivers/gpu/drm/i915/i915_scheduler.c
@@ -43,7 +43,7 @@ static inline struct i915_priolist *to_priolist(struct rb_node *rb)
static void assert_priolists(struct intel_engine_execlists * const execlists)
{
struct rb_node *rb;
- long last_prio, i;
+ long last_prio;
if (!IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM))
return;
@@ -57,14 +57,6 @@ static void assert_priolists(struct intel_engine_execlists * const execlists)
GEM_BUG_ON(p->priority > last_prio);
last_prio = p->priority;
-
- GEM_BUG_ON(!p->used);
- for (i = 0; i < ARRAY_SIZE(p->requests); i++) {
- if (list_empty(&p->requests[i]))
- continue;
-
- GEM_BUG_ON(!(p->used & BIT(i)));
- }
}
}
@@ -75,13 +67,10 @@ i915_sched_lookup_priolist(struct intel_engine_cs *engine, int prio)
struct i915_priolist *p;
struct rb_node **parent, *rb;
bool first = true;
- int idx, i;
lockdep_assert_held(&engine->active.lock);
assert_priolists(execlists);
- /* buckets sorted from highest [in slot 0] to lowest priority */
- idx = I915_PRIORITY_COUNT - (prio & I915_PRIORITY_MASK) - 1;
prio >>= I915_USER_PRIORITY_SHIFT;
if (unlikely(execlists->no_priolist))
prio = I915_PRIORITY_NORMAL;
@@ -99,7 +88,7 @@ i915_sched_lookup_priolist(struct intel_engine_cs *engine, int prio)
parent = &rb->rb_right;
first = false;
} else {
- goto out;
+ return &p->requests;
}
}
@@ -125,15 +114,12 @@ i915_sched_lookup_priolist(struct intel_engine_cs *engine, int prio)
}
p->priority = prio;
- for (i = 0; i < ARRAY_SIZE(p->requests); i++)
- INIT_LIST_HEAD(&p->requests[i]);
+ INIT_LIST_HEAD(&p->requests);
+
rb_link_node(&p->node, rb, parent);
rb_insert_color_cached(&p->node, &execlists->queue, first);
- p->used = 0;
-out:
- p->used |= BIT(idx);
- return &p->requests[idx];
+ return &p->requests;
}
void __i915_priolist_free(struct i915_priolist *p)
@@ -363,30 +349,6 @@ void i915_schedule(struct i915_request *rq, const struct i915_sched_attr *attr)
spin_unlock_irq(&schedule_lock);
}
-static void __bump_priority(struct i915_sched_node *node, unsigned int bump)
-{
- struct i915_sched_attr attr = node->attr;
-
- if (attr.priority & bump)
- return;
-
- attr.priority |= bump;
- __i915_schedule(node, &attr);
-}
-
-void i915_schedule_bump_priority(struct i915_request *rq, unsigned int bump)
-{
- unsigned long flags;
-
- GEM_BUG_ON(bump & ~I915_PRIORITY_MASK);
- if (READ_ONCE(rq->sched.attr.priority) & bump)
- return;
-
- spin_lock_irqsave(&schedule_lock, flags);
- __bump_priority(&rq->sched, bump);
- spin_unlock_irqrestore(&schedule_lock, flags);
-}
-
void i915_sched_node_init(struct i915_sched_node *node)
{
INIT_LIST_HEAD(&node->signalers_list);
@@ -553,8 +515,7 @@ int __init i915_global_scheduler_init(void)
if (!global.slab_dependencies)
return -ENOMEM;
- global.slab_priorities = KMEM_CACHE(i915_priolist,
- SLAB_HWCACHE_ALIGN);
+ global.slab_priorities = KMEM_CACHE(i915_priolist, 0);
if (!global.slab_priorities)
goto err_priorities;
diff --git a/drivers/gpu/drm/i915/i915_scheduler.h b/drivers/gpu/drm/i915/i915_scheduler.h
index 4501e5ac2637..858a0938f47a 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.h
+++ b/drivers/gpu/drm/i915/i915_scheduler.h
@@ -15,17 +15,11 @@
struct drm_printer;
-#define priolist_for_each_request(it, plist, idx) \
- for (idx = 0; idx < ARRAY_SIZE((plist)->requests); idx++) \
- list_for_each_entry(it, &(plist)->requests[idx], sched.link)
+#define priolist_for_each_request(it, plist) \
+ list_for_each_entry(it, &(plist)->requests, sched.link)
-#define priolist_for_each_request_consume(it, n, plist, idx) \
- for (; \
- (plist)->used ? (idx = __ffs((plist)->used)), 1 : 0; \
- (plist)->used &= ~BIT(idx)) \
- list_for_each_entry_safe(it, n, \
- &(plist)->requests[idx], \
- sched.link)
+#define priolist_for_each_request_consume(it, n, plist) \
+ list_for_each_entry_safe(it, n, &(plist)->requests, sched.link)
void i915_sched_node_init(struct i915_sched_node *node);
void i915_sched_node_reinit(struct i915_sched_node *node);
@@ -44,8 +38,6 @@ void i915_sched_node_fini(struct i915_sched_node *node);
void i915_schedule(struct i915_request *request,
const struct i915_sched_attr *attr);
-void i915_schedule_bump_priority(struct i915_request *rq, unsigned int bump);
-
struct list_head *
i915_sched_lookup_priolist(struct intel_engine_cs *engine, int prio);
--
2.20.1
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