[PATCH 33/38] drm/i915: Move the global sync optimisation to the timeline
Chris Wilson
chris at chris-wilson.co.uk
Tue Sep 27 08:30:54 UTC 2016
Currently we try to reduce the number of synchronisations (now the
number of requests we need to wait upon) by noting that if we have
earlier waited upon a request, all subsequent requests in the timeline
will be after the wait. This only applies to requests in this timeline,
as other timelines will not be ordered by that waiter.
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 | 9 ------
drivers/gpu/drm/i915/i915_drv.h | 1 -
drivers/gpu/drm/i915/i915_gem_request.c | 18 ++++++++----
drivers/gpu/drm/i915/i915_gem_timeline.h | 1 +
drivers/gpu/drm/i915/i915_gpu_error.c | 48 +++++++++++++++++++-------------
drivers/gpu/drm/i915/intel_engine_cs.c | 2 --
drivers/gpu/drm/i915/intel_ringbuffer.c | 3 --
drivers/gpu/drm/i915/intel_ringbuffer.h | 23 ---------------
8 files changed, 43 insertions(+), 62 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index ea22be16d86e..8ded9d122f4d 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -3209,15 +3209,6 @@ static int i915_semaphore_status(struct seq_file *m, void *unused)
seq_putc(m, '\n');
}
- seq_puts(m, "\nSync seqno:\n");
- for_each_engine(engine, dev_priv) {
- for (j = 0; j < num_rings; j++)
- seq_printf(m, " 0x%08x ",
- engine->semaphore.sync_seqno[j]);
- seq_putc(m, '\n');
- }
- seq_putc(m, '\n');
-
intel_runtime_pm_put(dev_priv);
mutex_unlock(&dev->struct_mutex);
return 0;
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index bc63f4b3727e..97282d31a06d 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -785,7 +785,6 @@ struct drm_i915_error_state {
u32 cpu_ring_tail;
u32 last_seqno;
- u32 semaphore_seqno[I915_NUM_ENGINES - 1];
/* Register state */
u32 start;
diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index a491980a868c..51c8c38ca3d6 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -238,8 +238,9 @@ static int i915_gem_check_wedge(struct drm_i915_private *dev_priv)
static int i915_gem_init_global_seqno(struct drm_i915_private *dev_priv,
u32 seqno)
{
+ struct i915_gem_timeline *timeline;
struct intel_engine_cs *engine;
- int ret;
+ int ret, i;
/* Carefully retire all requests without writing to the rings */
ret = i915_gem_wait_for_idle(dev_priv,
@@ -262,6 +263,14 @@ static int i915_gem_init_global_seqno(struct drm_i915_private *dev_priv,
for_each_engine(engine, dev_priv)
intel_engine_init_global_seqno(engine, seqno);
+ list_for_each_entry(timeline, &dev_priv->gt.timelines, link) {
+ for (i = 0; i < ARRAY_SIZE(timeline->engine); i++) {
+ struct intel_timeline *tl = &timeline->engine[i];
+
+ memset(tl->sync_seqno, 0, sizeof(tl->sync_seqno));
+ }
+ }
+
return 0;
}
@@ -456,7 +465,7 @@ static int
i915_gem_request_await_request(struct drm_i915_gem_request *to,
struct drm_i915_gem_request *from)
{
- int idx, ret;
+ int ret;
GEM_BUG_ON(to == from);
@@ -477,8 +486,7 @@ i915_gem_request_await_request(struct drm_i915_gem_request *to,
return ret < 0 ? ret : 0;
}
- idx = intel_engine_sync_index(from->engine, to->engine);
- if (from->global_seqno <= from->engine->semaphore.sync_seqno[idx])
+ if (from->global_seqno <= to->timeline->sync_seqno[from->engine->id])
return 0;
trace_i915_gem_ring_sync_to(to, from);
@@ -496,7 +504,7 @@ i915_gem_request_await_request(struct drm_i915_gem_request *to,
return ret;
}
- from->engine->semaphore.sync_seqno[idx] = from->global_seqno;
+ to->timeline->sync_seqno[from->engine->id] = from->global_seqno;
return 0;
}
diff --git a/drivers/gpu/drm/i915/i915_gem_timeline.h b/drivers/gpu/drm/i915/i915_gem_timeline.h
index be34c2e5ac85..ec2e56352c4b 100644
--- a/drivers/gpu/drm/i915/i915_gem_timeline.h
+++ b/drivers/gpu/drm/i915/i915_gem_timeline.h
@@ -47,6 +47,7 @@ struct intel_timeline {
* struct_mutex.
*/
struct i915_gem_active last_request;
+ u32 sync_seqno[I915_NUM_ENGINES];
struct i915_gem_timeline *common;
};
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 5656b24e4419..a02eed4bd050 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -402,17 +402,13 @@ static void error_print_engine(struct drm_i915_error_state_buf *m,
if (INTEL_GEN(m->i915) >= 6) {
err_printf(m, " RC PSMI: 0x%08x\n", ee->rc_psmi);
err_printf(m, " FAULT_REG: 0x%08x\n", ee->fault_reg);
- err_printf(m, " SYNC_0: 0x%08x [last synced 0x%08x]\n",
- ee->semaphore_mboxes[0],
- ee->semaphore_seqno[0]);
- err_printf(m, " SYNC_1: 0x%08x [last synced 0x%08x]\n",
- ee->semaphore_mboxes[1],
- ee->semaphore_seqno[1]);
- if (HAS_VEBOX(m->i915)) {
- err_printf(m, " SYNC_2: 0x%08x [last synced 0x%08x]\n",
- ee->semaphore_mboxes[2],
- ee->semaphore_seqno[2]);
- }
+ err_printf(m, " SYNC_0: 0x%08x\n",
+ ee->semaphore_mboxes[0]);
+ err_printf(m, " SYNC_1: 0x%08x\n",
+ ee->semaphore_mboxes[1]);
+ if (HAS_VEBOX(m->i915))
+ err_printf(m, " SYNC_2: 0x%08x\n",
+ ee->semaphore_mboxes[2]);
}
if (USES_PPGTT(m->i915)) {
err_printf(m, " GFX_MODE: 0x%08x\n", ee->vm_info.gfx_mode);
@@ -951,6 +947,26 @@ static void i915_gem_record_fences(struct drm_i915_private *dev_priv,
}
}
+static inline u32
+gen8_engine_sync_index(struct intel_engine_cs *engine,
+ struct intel_engine_cs *other)
+{
+ int idx;
+
+ /*
+ * rcs -> 0 = vcs, 1 = bcs, 2 = vecs, 3 = vcs2;
+ * vcs -> 0 = bcs, 1 = vecs, 2 = vcs2, 3 = rcs;
+ * bcs -> 0 = vecs, 1 = vcs2. 2 = rcs, 3 = vcs;
+ * vecs -> 0 = vcs2, 1 = rcs, 2 = vcs, 3 = bcs;
+ * vcs2 -> 0 = rcs, 1 = vcs, 2 = bcs, 3 = vecs;
+ */
+
+ idx = (other - engine) - 1;
+ if (idx < 0)
+ idx += I915_NUM_ENGINES;
+
+ return idx;
+}
static void gen8_record_semaphore_state(struct drm_i915_error_state *error,
struct intel_engine_cs *engine,
@@ -974,10 +990,9 @@ static void gen8_record_semaphore_state(struct drm_i915_error_state *error,
signal_offset =
(GEN8_SIGNAL_OFFSET(engine, id) & (PAGE_SIZE - 1)) / 4;
tmp = error->semaphore->pages[0];
- idx = intel_engine_sync_index(engine, to);
+ idx = gen8_engine_sync_index(engine, to);
ee->semaphore_mboxes[idx] = tmp[signal_offset];
- ee->semaphore_seqno[idx] = engine->semaphore.sync_seqno[idx];
}
}
@@ -988,14 +1003,9 @@ static void gen6_record_semaphore_state(struct intel_engine_cs *engine,
ee->semaphore_mboxes[0] = I915_READ(RING_SYNC_0(engine->mmio_base));
ee->semaphore_mboxes[1] = I915_READ(RING_SYNC_1(engine->mmio_base));
- ee->semaphore_seqno[0] = engine->semaphore.sync_seqno[0];
- ee->semaphore_seqno[1] = engine->semaphore.sync_seqno[1];
-
- if (HAS_VEBOX(dev_priv)) {
+ if (HAS_VEBOX(dev_priv))
ee->semaphore_mboxes[2] =
I915_READ(RING_SYNC_2(engine->mmio_base));
- ee->semaphore_seqno[2] = engine->semaphore.sync_seqno[2];
- }
}
static void error_record_engine_waiters(struct intel_engine_cs *engine,
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 1e23d171349f..2c8883d0b892 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -191,8 +191,6 @@ void intel_engine_init_global_seqno(struct intel_engine_cs *engine, u32 seqno)
I915_NUM_ENGINES * gen8_semaphore_seqno_size);
kunmap(page);
}
- memset(engine->semaphore.sync_seqno, 0,
- sizeof(engine->semaphore.sync_seqno));
intel_write_status_page(engine, I915_GEM_HWS_INDEX, seqno);
if (engine->irq_seqno_barrier)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 70b973e375c8..2d2a2b568982 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2003,9 +2003,6 @@ static int intel_init_ring_buffer(struct intel_engine_cs *engine)
intel_engine_setup_common(engine);
- memset(engine->semaphore.sync_seqno, 0,
- sizeof(engine->semaphore.sync_seqno));
-
ret = intel_engine_init_common(engine);
if (ret)
goto error;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 2b6ab15bc2a5..e08870e5328b 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -314,8 +314,6 @@ struct intel_engine_cs {
* ie. transpose of f(x, y)
*/
struct {
- u32 sync_seqno[I915_NUM_ENGINES-1];
-
union {
#define GEN6_SEMAPHORE_LAST VECS_HW
#define GEN6_NUM_SEMAPHORES (GEN6_SEMAPHORE_LAST + 1)
@@ -391,27 +389,6 @@ intel_engine_flag(const struct intel_engine_cs *engine)
return 1 << engine->id;
}
-static inline u32
-intel_engine_sync_index(struct intel_engine_cs *engine,
- struct intel_engine_cs *other)
-{
- int idx;
-
- /*
- * rcs -> 0 = vcs, 1 = bcs, 2 = vecs, 3 = vcs2;
- * vcs -> 0 = bcs, 1 = vecs, 2 = vcs2, 3 = rcs;
- * bcs -> 0 = vecs, 1 = vcs2. 2 = rcs, 3 = vcs;
- * vecs -> 0 = vcs2, 1 = rcs, 2 = vcs, 3 = bcs;
- * vcs2 -> 0 = rcs, 1 = vcs, 2 = bcs, 3 = vecs;
- */
-
- idx = (other - engine) - 1;
- if (idx < 0)
- idx += I915_NUM_ENGINES;
-
- return idx;
-}
-
static inline void
intel_flush_status_page(struct intel_engine_cs *engine, int reg)
{
--
2.9.3
More information about the Intel-gfx-trybot
mailing list