[PATCH 42/51] drm/i915: Introduce a global_seqno for each request
Chris Wilson
chris at chris-wilson.co.uk
Mon Oct 3 20:32:25 UTC 2016
Though we will have multiple timelines, we still have a single timeline
of execution. This we can use to provide an execution and retirement order
of requests. This keeps tracking execution of requests simple, and vital
for preserving a single waiter (i.e. so that we can order the waiters so
that only the earliest to wakeup need be woken). To accomplish this we
distinguish the seqno used to order requests per-context (external) and
that used internally for execution.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 2 +-
drivers/gpu/drm/i915/i915_drv.h | 4 ++--
drivers/gpu/drm/i915/i915_gem.c | 4 ++--
drivers/gpu/drm/i915/i915_gem_request.c | 23 ++++++++++++++++-------
drivers/gpu/drm/i915/i915_gem_request.h | 30 +++++++++++++++++++++++++-----
drivers/gpu/drm/i915/i915_gpu_error.c | 2 +-
drivers/gpu/drm/i915/i915_guc_submission.c | 4 ++--
drivers/gpu/drm/i915/i915_trace.h | 8 ++++----
drivers/gpu/drm/i915/intel_breadcrumbs.c | 8 +++++---
drivers/gpu/drm/i915/intel_lrc.c | 4 ++--
drivers/gpu/drm/i915/intel_ringbuffer.c | 14 +++++++-------
11 files changed, 67 insertions(+), 36 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 64098aed6881..7784b6b7981d 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -636,7 +636,7 @@ static void print_request(struct seq_file *m,
rcu_read_lock();
task = pid ? pid_task(pid, PIDTYPE_PID) : NULL;
seq_printf(m, "%s%x [%x:%x] @ %d: %s [%d]\n", prefix,
- rq->fence.seqno, rq->ctx->hw_id, rq->fence.seqno,
+ rq->global_seqno, rq->ctx->hw_id, rq->fence.seqno,
jiffies_to_msecs(jiffies - rq->emitted_jiffies),
task ? task->comm : "<unknown>",
task ? task->pid : -1);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 02cdd418c099..3393e7656c50 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3982,7 +3982,7 @@ __i915_request_irq_complete(struct drm_i915_gem_request *req)
/* Before we do the heavier coherent read of the seqno,
* check the value (hopefully) in the CPU cacheline.
*/
- if (i915_gem_request_completed(req))
+ if (__i915_gem_request_completed(req))
return true;
/* Ensure our read of the seqno is coherent so that we
@@ -4033,7 +4033,7 @@ __i915_request_irq_complete(struct drm_i915_gem_request *req)
wake_up_process(tsk);
rcu_read_unlock();
- if (i915_gem_request_completed(req))
+ if (__i915_gem_request_completed(req))
return true;
}
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 40bb2997e3b0..af6e3641d6c2 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2524,7 +2524,7 @@ i915_gem_find_active_request(struct intel_engine_cs *engine)
* not need an engine->irq_seqno_barrier() before the seqno reads.
*/
list_for_each_entry(request, &engine->timeline->requests, link) {
- if (i915_gem_request_completed(request))
+ if (__i915_gem_request_completed(request))
continue;
if (!i915_sw_fence_done(&request->submit))
@@ -2575,7 +2575,7 @@ static void i915_gem_reset_engine(struct intel_engine_cs *engine)
return;
DRM_DEBUG_DRIVER("resetting %s to restart from tail of request 0x%x\n",
- engine->name, request->fence.seqno);
+ engine->name, request->global_seqno);
/* Setup the CS to resume from the breadcrumb of the hung request */
engine->reset_hw(engine, request);
diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index c7a46f7a4215..403bff6e14cd 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -358,7 +358,7 @@ i915_gem_request_alloc(struct intel_engine_cs *engine,
/* Move the oldest request to the slab-cache (if not in use!) */
req = list_first_entry_or_null(&engine->timeline->requests,
typeof(*req), link);
- if (req && i915_gem_request_completed(req))
+ if (req && __i915_gem_request_completed(req))
i915_gem_request_retire(req);
/* Beware: Dragons be flying overhead.
@@ -369,7 +369,7 @@ i915_gem_request_alloc(struct intel_engine_cs *engine,
* of being read by __i915_gem_active_get_rcu(). As such,
* we have to be very careful when overwriting the contents. During
* the RCU lookup, we change chase the request->engine pointer,
- * read the request->fence.seqno and increment the reference count.
+ * read the request->global_seqno and increment the reference count.
*
* The reference count is incremented atomically. If it is zero,
* the lookup knows the request is unallocated and complete. Otherwise,
@@ -411,6 +411,7 @@ i915_gem_request_alloc(struct intel_engine_cs *engine,
INIT_LIST_HEAD(&req->active_list);
req->i915 = dev_priv;
req->engine = engine;
+ req->global_seqno = seqno;
req->ctx = i915_gem_context_get(ctx);
/* No zalloc, must clear what we need by hand */
@@ -468,8 +469,15 @@ i915_gem_request_await_request(struct drm_i915_gem_request *to,
return ret < 0 ? ret : 0;
}
+ if (!from->global_seqno) {
+ ret = i915_sw_fence_await_dma_fence(&to->submit,
+ &from->fence, 0,
+ GFP_KERNEL);
+ return ret < 0 ? ret : 0;
+ }
+
idx = intel_engine_sync_index(from->engine, to->engine);
- if (from->fence.seqno <= from->engine->semaphore.sync_seqno[idx])
+ if (from->global_seqno <= from->engine->semaphore.sync_seqno[idx])
return 0;
trace_i915_gem_ring_sync_to(to, from);
@@ -487,7 +495,7 @@ i915_gem_request_await_request(struct drm_i915_gem_request *to,
return ret;
}
- from->engine->semaphore.sync_seqno[idx] = from->fence.seqno;
+ from->engine->semaphore.sync_seqno[idx] = from->global_seqno;
return 0;
}
@@ -759,7 +767,7 @@ bool __i915_spin_request(const struct drm_i915_gem_request *req,
timeout_us += local_clock_us(&cpu);
do {
- if (i915_gem_request_completed(req))
+ if (__i915_gem_request_completed(req))
return true;
if (signal_pending_state(state, current))
@@ -863,6 +871,7 @@ long i915_wait_request(struct drm_i915_gem_request *req,
if (timeout < 0)
goto complete;
}
+ GEM_BUG_ON(!req->global_seqno);
/* Optimistic short spin before touching IRQs */
if (i915_spin_request(req, state, 5))
@@ -872,7 +881,7 @@ long i915_wait_request(struct drm_i915_gem_request *req,
if (flags & I915_WAIT_LOCKED)
add_wait_queue(&req->i915->gpu_error.wait_queue, &reset);
- intel_wait_init(&wait, req->fence.seqno);
+ intel_wait_init(&wait, req->global_seqno);
if (intel_engine_add_wait(req->engine, &wait))
/* In order to check that we haven't missed the interrupt
* as we enabled it, we need to kick ourselves to do a
@@ -948,7 +957,7 @@ static bool engine_retire_requests(struct intel_engine_cs *engine)
list_for_each_entry_safe(request, next,
&engine->timeline->requests, link) {
- if (!i915_gem_request_completed(request))
+ if (!__i915_gem_request_completed(request))
return false;
i915_gem_request_retire(request);
diff --git a/drivers/gpu/drm/i915/i915_gem_request.h b/drivers/gpu/drm/i915/i915_gem_request.h
index 378f523844bb..a067dee73834 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.h
+++ b/drivers/gpu/drm/i915/i915_gem_request.h
@@ -87,6 +87,8 @@ struct drm_i915_gem_request {
struct i915_sw_fence submit;
wait_queue_t submitq;
+ u32 global_seqno;
+
/** GEM sequence number associated with the previous request,
* when the HWS breadcrumb is equal to this the GPU is processing
* this request.
@@ -163,7 +165,7 @@ void i915_gem_request_retire_upto(struct drm_i915_gem_request *req);
static inline u32
i915_gem_request_get_seqno(struct drm_i915_gem_request *req)
{
- return req ? req->fence.seqno : 0;
+ return req ? req->global_seqno : 0;
}
static inline struct intel_engine_cs *
@@ -248,17 +250,35 @@ static inline bool i915_seqno_passed(u32 seq1, u32 seq2)
}
static inline bool
-i915_gem_request_started(const struct drm_i915_gem_request *req)
+__i915_gem_request_started(const struct drm_i915_gem_request *req)
{
return i915_seqno_passed(intel_engine_get_seqno(req->engine),
req->previous_seqno);
}
static inline bool
-i915_gem_request_completed(const struct drm_i915_gem_request *req)
+i915_gem_request_started(const struct drm_i915_gem_request *req)
+{
+ if (!req->global_seqno)
+ return false;
+
+ return __i915_gem_request_started(req);
+}
+
+static inline bool
+__i915_gem_request_completed(const struct drm_i915_gem_request *req)
{
return i915_seqno_passed(intel_engine_get_seqno(req->engine),
- req->fence.seqno);
+ req->global_seqno);
+}
+
+static inline bool
+i915_gem_request_completed(const struct drm_i915_gem_request *req)
+{
+ if (!req->global_seqno)
+ return false;
+
+ return __i915_gem_request_completed(req);
}
bool __i915_spin_request(const struct drm_i915_gem_request *request,
@@ -266,7 +286,7 @@ bool __i915_spin_request(const struct drm_i915_gem_request *request,
static inline bool i915_spin_request(const struct drm_i915_gem_request *request,
int state, unsigned long timeout_us)
{
- return (i915_gem_request_started(request) &&
+ return (__i915_gem_request_started(request) &&
__i915_spin_request(request, state, timeout_us));
}
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 659f87e167da..ff64dc8263d4 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -1204,7 +1204,7 @@ static void engine_record_requests(struct intel_engine_cs *engine,
}
erq = &ee->requests[count++];
- erq->seqno = request->fence.seqno;
+ erq->seqno = request->global_seqno;
erq->jiffies = request->emitted_jiffies;
erq->head = request->head;
erq->tail = request->tail;
diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index 7aa5f806f9bc..ec785f4dfd34 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -509,7 +509,7 @@ static void guc_wq_item_append(struct i915_guc_client *gc,
wqi->context_desc = (u32)intel_lr_context_descriptor(rq->ctx, engine);
wqi->ring_tail = tail << WQ_RING_TAIL_SHIFT;
- wqi->fence_id = rq->fence.seqno;
+ wqi->fence_id = rq->global_seqno;
kunmap_atomic(base);
}
@@ -604,7 +604,7 @@ static void i915_guc_submit(struct drm_i915_gem_request *rq)
client->b_fail += 1;
guc->submissions[engine_id] += 1;
- guc->last_seqno[engine_id] = rq->fence.seqno;
+ guc->last_seqno[engine_id] = rq->global_seqno;
spin_unlock(&client->wq_lock);
}
diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h
index 178798002a73..4c46f7c00323 100644
--- a/drivers/gpu/drm/i915/i915_trace.h
+++ b/drivers/gpu/drm/i915/i915_trace.h
@@ -466,7 +466,7 @@ TRACE_EVENT(i915_gem_ring_sync_to,
__entry->dev = from->i915->drm.primary->index;
__entry->sync_from = from->engine->id;
__entry->sync_to = to->engine->id;
- __entry->seqno = from->fence.seqno;
+ __entry->seqno = from->global_seqno;
),
TP_printk("dev=%u, sync-from=%u, sync-to=%u, seqno=%u",
@@ -489,7 +489,7 @@ TRACE_EVENT(i915_gem_ring_dispatch,
TP_fast_assign(
__entry->dev = req->i915->drm.primary->index;
__entry->ring = req->engine->id;
- __entry->seqno = req->fence.seqno;
+ __entry->seqno = req->global_seqno;
__entry->flags = flags;
fence_enable_sw_signaling(&req->fence);
),
@@ -534,7 +534,7 @@ DECLARE_EVENT_CLASS(i915_gem_request,
TP_fast_assign(
__entry->dev = req->i915->drm.primary->index;
__entry->ring = req->engine->id;
- __entry->seqno = req->fence.seqno;
+ __entry->seqno = req->global_seqno;
),
TP_printk("dev=%u, ring=%u, seqno=%u",
@@ -596,7 +596,7 @@ TRACE_EVENT(i915_gem_request_wait_begin,
TP_fast_assign(
__entry->dev = req->i915->drm.primary->index;
__entry->ring = req->engine->id;
- __entry->seqno = req->fence.seqno;
+ __entry->seqno = req->global_seqno;
__entry->blocking =
mutex_is_locked(&req->i915->drm.struct_mutex);
),
diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c
index 9bad14d22c95..9ad1028681cf 100644
--- a/drivers/gpu/drm/i915/intel_breadcrumbs.c
+++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c
@@ -504,9 +504,11 @@ void intel_engine_enable_signaling(struct drm_i915_gem_request *request)
/* locked by fence_enable_sw_signaling() */
assert_spin_locked(&request->lock);
+ if (!request->global_seqno)
+ return;
request->signaling.wait.tsk = b->signaler;
- request->signaling.wait.seqno = request->fence.seqno;
+ request->signaling.wait.seqno = request->global_seqno;
i915_gem_request_get(request);
spin_lock(&b->lock);
@@ -530,8 +532,8 @@ void intel_engine_enable_signaling(struct drm_i915_gem_request *request)
p = &b->signals.rb_node;
while (*p) {
parent = *p;
- if (i915_seqno_passed(request->fence.seqno,
- to_signaler(parent)->fence.seqno)) {
+ if (i915_seqno_passed(request->global_seqno,
+ to_signaler(parent)->global_seqno)) {
p = &parent->rb_right;
first = false;
} else {
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index db37747e23a0..8925dc6d3d1e 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1581,7 +1581,7 @@ static int gen8_emit_request(struct drm_i915_gem_request *request)
intel_hws_seqno_address(request->engine) |
MI_FLUSH_DW_USE_GTT);
intel_ring_emit(ring, 0);
- intel_ring_emit(ring, request->fence.seqno);
+ intel_ring_emit(ring, request->global_seqno);
intel_ring_emit(ring, MI_USER_INTERRUPT);
intel_ring_emit(ring, MI_NOOP);
return intel_logical_ring_advance(request);
@@ -1610,7 +1610,7 @@ static int gen8_emit_request_render(struct drm_i915_gem_request *request)
PIPE_CONTROL_QW_WRITE));
intel_ring_emit(ring, intel_hws_seqno_address(request->engine));
intel_ring_emit(ring, 0);
- intel_ring_emit(ring, i915_gem_request_get_seqno(request));
+ intel_ring_emit(ring, request->global_seqno);
/* We're thrashing one dword of HWS. */
intel_ring_emit(ring, 0);
intel_ring_emit(ring, MI_USER_INTERRUPT);
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 17ae849e20bd..7af9705d32c4 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1240,7 +1240,7 @@ static int gen8_rcs_signal(struct drm_i915_gem_request *req)
PIPE_CONTROL_CS_STALL);
intel_ring_emit(ring, lower_32_bits(gtt_offset));
intel_ring_emit(ring, upper_32_bits(gtt_offset));
- intel_ring_emit(ring, req->fence.seqno);
+ intel_ring_emit(ring, req->global_seqno);
intel_ring_emit(ring, 0);
intel_ring_emit(ring,
MI_SEMAPHORE_SIGNAL |
@@ -1276,7 +1276,7 @@ static int gen8_xcs_signal(struct drm_i915_gem_request *req)
lower_32_bits(gtt_offset) |
MI_FLUSH_DW_USE_GTT);
intel_ring_emit(ring, upper_32_bits(gtt_offset));
- intel_ring_emit(ring, req->fence.seqno);
+ intel_ring_emit(ring, req->global_seqno);
intel_ring_emit(ring,
MI_SEMAPHORE_SIGNAL |
MI_SEMAPHORE_TARGET(waiter->hw_id));
@@ -1309,7 +1309,7 @@ static int gen6_signal(struct drm_i915_gem_request *req)
if (i915_mmio_reg_valid(mbox_reg)) {
intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
intel_ring_emit_reg(ring, mbox_reg);
- intel_ring_emit(ring, req->fence.seqno);
+ intel_ring_emit(ring, req->global_seqno);
}
}
@@ -1340,7 +1340,7 @@ static int i9xx_emit_request(struct drm_i915_gem_request *req)
intel_ring_emit(ring, MI_STORE_DWORD_INDEX);
intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
- intel_ring_emit(ring, req->fence.seqno);
+ intel_ring_emit(ring, req->global_seqno);
intel_ring_emit(ring, MI_USER_INTERRUPT);
intel_ring_advance(ring);
@@ -1390,7 +1390,7 @@ static int gen8_render_emit_request(struct drm_i915_gem_request *req)
PIPE_CONTROL_QW_WRITE));
intel_ring_emit(ring, intel_hws_seqno_address(engine));
intel_ring_emit(ring, 0);
- intel_ring_emit(ring, i915_gem_request_get_seqno(req));
+ intel_ring_emit(ring, req->global_seqno);
/* We're thrashing one dword of HWS. */
intel_ring_emit(ring, 0);
intel_ring_emit(ring, MI_USER_INTERRUPT);
@@ -1428,7 +1428,7 @@ gen8_ring_sync_to(struct drm_i915_gem_request *req,
MI_SEMAPHORE_WAIT |
MI_SEMAPHORE_GLOBAL_GTT |
MI_SEMAPHORE_SAD_GTE_SDD);
- intel_ring_emit(ring, signal->fence.seqno);
+ intel_ring_emit(ring, signal->global_seqno);
intel_ring_emit(ring, lower_32_bits(offset));
intel_ring_emit(ring, upper_32_bits(offset));
intel_ring_advance(ring);
@@ -1466,7 +1466,7 @@ gen6_ring_sync_to(struct drm_i915_gem_request *req,
* seqno is >= the last seqno executed. However for hardware the
* comparison is strictly greater than.
*/
- intel_ring_emit(ring, signal->fence.seqno - 1);
+ intel_ring_emit(ring, signal->global_seqno - 1);
intel_ring_emit(ring, 0);
intel_ring_emit(ring, MI_NOOP);
intel_ring_advance(ring);
--
2.9.3
More information about the Intel-gfx-trybot
mailing list