[Intel-gfx] [PATCH 2/5] drm/i915: Separate out the seqno-barrier from engine->get_seqno
Chris Wilson
chris at chris-wilson.co.uk
Tue Feb 16 11:47:45 UTC 2016
In order to simplify future patches, extract the
lazy_coherency optimisation our of the engine->get_seqno() vfunc into
its own callback.
v2: Rename the barrier to engine->irq_seqno_barrier to try and better
reflect that the barrier is only required after the user interrupt before
reading the seqno (to ensure that the seqno update lands in time as we
do not have strict seqno-irq ordering on all platforms).
Reviewed-by: Dave Gordon <david.s.gordon at intel.com> [#v2]
v3: Comments for hangcheck paranoia. Mika wanted to keep the extra
barrier inside the hangcheck, just in case. I can argue that it doesn't
provide a barrier against anything, but the side-effects of applying the
barrier may prevent a false declaration of a hung GPU.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala at intel.com>
Cc: Dave Gordon <david.s.gordon at intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 6 +++---
drivers/gpu/drm/i915/i915_drv.h | 12 ++++++++----
drivers/gpu/drm/i915/i915_gpu_error.c | 2 +-
drivers/gpu/drm/i915/i915_irq.c | 14 ++++++++++++--
drivers/gpu/drm/i915/i915_trace.h | 2 +-
drivers/gpu/drm/i915/intel_lrc.c | 18 ++++++-----------
drivers/gpu/drm/i915/intel_ringbuffer.c | 34 +++++++++++++++++----------------
drivers/gpu/drm/i915/intel_ringbuffer.h | 4 ++--
8 files changed, 51 insertions(+), 41 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index ec0c2a05eed6..c4df580ed0de 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -600,7 +600,7 @@ static int i915_gem_pageflip_info(struct seq_file *m, void *data)
ring->name,
i915_gem_request_get_seqno(work->flip_queued_req),
dev_priv->next_seqno,
- ring->get_seqno(ring, true),
+ ring->get_seqno(ring),
i915_gem_request_completed(work->flip_queued_req, true));
} else
seq_printf(m, "Flip not associated with any ring\n");
@@ -732,7 +732,7 @@ static void i915_ring_seqno_info(struct seq_file *m,
{
if (ring->get_seqno) {
seq_printf(m, "Current sequence (%s): %x\n",
- ring->name, ring->get_seqno(ring, false));
+ ring->name, ring->get_seqno(ring));
}
}
@@ -1342,8 +1342,8 @@ static int i915_hangcheck_info(struct seq_file *m, void *unused)
intel_runtime_pm_get(dev_priv);
for_each_ring(ring, dev_priv, i) {
- seqno[i] = ring->get_seqno(ring, false);
acthd[i] = intel_ring_get_active_head(ring);
+ seqno[i] = ring->get_seqno(ring);
}
i915_get_extra_instdone(dev, instdone);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 20d9dbd9f9cf..525f39c0551b 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3001,15 +3001,19 @@ i915_seqno_passed(uint32_t seq1, uint32_t seq2)
static inline bool i915_gem_request_started(struct drm_i915_gem_request *req,
bool lazy_coherency)
{
- u32 seqno = req->ring->get_seqno(req->ring, lazy_coherency);
- return i915_seqno_passed(seqno, req->previous_seqno);
+ if (!lazy_coherency && req->ring->irq_seqno_barrier)
+ req->ring->irq_seqno_barrier(req->ring);
+ return i915_seqno_passed(req->ring->get_seqno(req->ring),
+ req->previous_seqno);
}
static inline bool i915_gem_request_completed(struct drm_i915_gem_request *req,
bool lazy_coherency)
{
- u32 seqno = req->ring->get_seqno(req->ring, lazy_coherency);
- return i915_seqno_passed(seqno, req->seqno);
+ if (!lazy_coherency && req->ring->irq_seqno_barrier)
+ req->ring->irq_seqno_barrier(req->ring);
+ return i915_seqno_passed(req->ring->get_seqno(req->ring),
+ req->seqno);
}
int __must_check i915_gem_get_seqno(struct drm_device *dev, u32 *seqno);
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 978c026963b8..33f1e0636a03 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -906,8 +906,8 @@ static void i915_record_ring_state(struct drm_device *dev,
ering->waiting = waitqueue_active(&ring->irq_queue);
ering->instpm = I915_READ(RING_INSTPM(ring->mmio_base));
- ering->seqno = ring->get_seqno(ring, false);
ering->acthd = intel_ring_get_active_head(ring);
+ ering->seqno = ring->get_seqno(ring);
ering->start = I915_READ_START(ring);
ering->head = I915_READ_HEAD(ring);
ering->tail = I915_READ_TAIL(ring);
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 25a89373df63..07bc2cdd6252 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2937,7 +2937,7 @@ static int semaphore_passed(struct intel_engine_cs *ring)
if (signaller->hangcheck.deadlock >= I915_NUM_RINGS)
return -1;
- if (i915_seqno_passed(signaller->get_seqno(signaller, false), seqno))
+ if (i915_seqno_passed(signaller->get_seqno(signaller), seqno))
return 1;
/* cursory check for an unkickable deadlock */
@@ -3101,8 +3101,18 @@ static void i915_hangcheck_elapsed(struct work_struct *work)
semaphore_clear_deadlocks(dev_priv);
- seqno = ring->get_seqno(ring, false);
+ /* We don't strictly need an irq-barrier here, as we are not
+ * serving an interrupt request, be paranoid in case the
+ * barrier has side-effects (such as preventing a broken
+ * cacheline snoop) and so be sure that we can see the seqno
+ * advance. If the seqno should stick, due to a stale
+ * cacheline, we would erroneously declare the GPU hung.
+ */
+ if (ring->irq_seqno_barrier)
+ ring->irq_seqno_barrier(ring);
+
acthd = intel_ring_get_active_head(ring);
+ seqno = ring->get_seqno(ring);
if (ring->hangcheck.seqno == seqno) {
if (ring_idle(ring, seqno)) {
diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h
index 52b2d409945d..cfb5f78a6e84 100644
--- a/drivers/gpu/drm/i915/i915_trace.h
+++ b/drivers/gpu/drm/i915/i915_trace.h
@@ -573,7 +573,7 @@ TRACE_EVENT(i915_gem_request_notify,
TP_fast_assign(
__entry->dev = ring->dev->primary->index;
__entry->ring = ring->id;
- __entry->seqno = ring->get_seqno(ring, false);
+ __entry->seqno = ring->get_seqno(ring);
),
TP_printk("dev=%u, ring=%u, seqno=%u",
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 3a03646e343d..0e833d470c5e 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1837,7 +1837,7 @@ static int gen8_emit_flush_render(struct drm_i915_gem_request *request,
return 0;
}
-static u32 gen8_get_seqno(struct intel_engine_cs *ring, bool lazy_coherency)
+static u32 gen8_get_seqno(struct intel_engine_cs *ring)
{
return intel_read_status_page(ring, I915_GEM_HWS_INDEX);
}
@@ -1847,9 +1847,8 @@ static void gen8_set_seqno(struct intel_engine_cs *ring, u32 seqno)
intel_write_status_page(ring, I915_GEM_HWS_INDEX, seqno);
}
-static u32 bxt_a_get_seqno(struct intel_engine_cs *ring, bool lazy_coherency)
+static void bxt_seqno_barrier(struct intel_engine_cs *ring)
{
-
/*
* On BXT A steppings there is a HW coherency issue whereby the
* MI_STORE_DATA_IMM storing the completed request's seqno
@@ -1860,11 +1859,7 @@ static u32 bxt_a_get_seqno(struct intel_engine_cs *ring, bool lazy_coherency)
* bxt_a_set_seqno(), where we also do a clflush after the write. So
* this clflush in practice becomes an invalidate operation.
*/
-
- if (!lazy_coherency)
- intel_flush_status_page(ring, I915_GEM_HWS_INDEX);
-
- return intel_read_status_page(ring, I915_GEM_HWS_INDEX);
+ intel_flush_status_page(ring, I915_GEM_HWS_INDEX);
}
static void bxt_a_set_seqno(struct intel_engine_cs *ring, u32 seqno)
@@ -2034,12 +2029,11 @@ logical_ring_default_vfuncs(struct drm_device *dev,
ring->irq_get = gen8_logical_ring_get_irq;
ring->irq_put = gen8_logical_ring_put_irq;
ring->emit_bb_start = gen8_emit_bb_start;
+ ring->get_seqno = gen8_get_seqno;
+ ring->set_seqno = gen8_set_seqno;
if (IS_BXT_REVID(dev, 0, BXT_REVID_A1)) {
- ring->get_seqno = bxt_a_get_seqno;
+ ring->irq_seqno_barrier = bxt_seqno_barrier;
ring->set_seqno = bxt_a_set_seqno;
- } else {
- ring->get_seqno = gen8_get_seqno;
- ring->set_seqno = gen8_set_seqno;
}
}
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index abac0560d075..573203618dfe 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1548,8 +1548,8 @@ pc_render_add_request(struct drm_i915_gem_request *req)
return 0;
}
-static u32
-gen6_ring_get_seqno(struct intel_engine_cs *ring, bool lazy_coherency)
+static void
+gen6_seqno_barrier(struct intel_engine_cs *ring)
{
/* Workaround to force correct ordering between irq and seqno writes on
* ivb (and maybe also on snb) by reading from a CS register (like
@@ -1563,16 +1563,12 @@ gen6_ring_get_seqno(struct intel_engine_cs *ring, bool lazy_coherency)
* batch i.e. much more frequent than a delay when waiting for the
* interrupt (with the same net latency).
*/
- if (!lazy_coherency) {
- struct drm_i915_private *dev_priv = ring->dev->dev_private;
- POSTING_READ_FW(RING_ACTHD(ring->mmio_base));
- }
-
- return intel_read_status_page(ring, I915_GEM_HWS_INDEX);
+ struct drm_i915_private *dev_priv = to_i915(ring->dev);
+ POSTING_READ_FW(RING_ACTHD(ring->mmio_base));
}
static u32
-ring_get_seqno(struct intel_engine_cs *ring, bool lazy_coherency)
+ring_get_seqno(struct intel_engine_cs *ring)
{
return intel_read_status_page(ring, I915_GEM_HWS_INDEX);
}
@@ -1584,7 +1580,7 @@ ring_set_seqno(struct intel_engine_cs *ring, u32 seqno)
}
static u32
-pc_render_get_seqno(struct intel_engine_cs *ring, bool lazy_coherency)
+pc_render_get_seqno(struct intel_engine_cs *ring)
{
return ring->scratch.cpu_page[0];
}
@@ -2783,7 +2779,8 @@ int intel_init_render_ring_buffer(struct drm_device *dev)
ring->irq_get = gen8_ring_get_irq;
ring->irq_put = gen8_ring_put_irq;
ring->irq_enable_mask = GT_RENDER_USER_INTERRUPT;
- ring->get_seqno = gen6_ring_get_seqno;
+ ring->irq_seqno_barrier = gen6_seqno_barrier;
+ ring->get_seqno = ring_get_seqno;
ring->set_seqno = ring_set_seqno;
if (i915_semaphore_is_enabled(dev)) {
WARN_ON(!dev_priv->semaphore_obj);
@@ -2800,7 +2797,8 @@ int intel_init_render_ring_buffer(struct drm_device *dev)
ring->irq_get = gen6_ring_get_irq;
ring->irq_put = gen6_ring_put_irq;
ring->irq_enable_mask = GT_RENDER_USER_INTERRUPT;
- ring->get_seqno = gen6_ring_get_seqno;
+ ring->irq_seqno_barrier = gen6_seqno_barrier;
+ ring->get_seqno = ring_get_seqno;
ring->set_seqno = ring_set_seqno;
if (i915_semaphore_is_enabled(dev)) {
ring->semaphore.sync_to = gen6_ring_sync;
@@ -2915,7 +2913,8 @@ int intel_init_bsd_ring_buffer(struct drm_device *dev)
ring->write_tail = gen6_bsd_ring_write_tail;
ring->flush = gen6_bsd_ring_flush;
ring->add_request = gen6_add_request;
- ring->get_seqno = gen6_ring_get_seqno;
+ ring->irq_seqno_barrier = gen6_seqno_barrier;
+ ring->get_seqno = ring_get_seqno;
ring->set_seqno = ring_set_seqno;
if (INTEL_INFO(dev)->gen >= 8) {
ring->irq_enable_mask =
@@ -2988,7 +2987,8 @@ int intel_init_bsd2_ring_buffer(struct drm_device *dev)
ring->mmio_base = GEN8_BSD2_RING_BASE;
ring->flush = gen6_bsd_ring_flush;
ring->add_request = gen6_add_request;
- ring->get_seqno = gen6_ring_get_seqno;
+ ring->irq_seqno_barrier = gen6_seqno_barrier;
+ ring->get_seqno = ring_get_seqno;
ring->set_seqno = ring_set_seqno;
ring->irq_enable_mask =
GT_RENDER_USER_INTERRUPT << GEN8_VCS2_IRQ_SHIFT;
@@ -3019,7 +3019,8 @@ int intel_init_blt_ring_buffer(struct drm_device *dev)
ring->write_tail = ring_write_tail;
ring->flush = gen6_ring_flush;
ring->add_request = gen6_add_request;
- ring->get_seqno = gen6_ring_get_seqno;
+ ring->irq_seqno_barrier = gen6_seqno_barrier;
+ ring->get_seqno = ring_get_seqno;
ring->set_seqno = ring_set_seqno;
if (INTEL_INFO(dev)->gen >= 8) {
ring->irq_enable_mask =
@@ -3077,7 +3078,8 @@ int intel_init_vebox_ring_buffer(struct drm_device *dev)
ring->write_tail = ring_write_tail;
ring->flush = gen6_ring_flush;
ring->add_request = gen6_add_request;
- ring->get_seqno = gen6_ring_get_seqno;
+ ring->irq_seqno_barrier = gen6_seqno_barrier;
+ ring->get_seqno = ring_get_seqno;
ring->set_seqno = ring_set_seqno;
if (INTEL_INFO(dev)->gen >= 8) {
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 566b0ae10ce0..4cea04491392 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -196,8 +196,8 @@ struct intel_engine_cs {
* seen value is good enough. Note that the seqno will always be
* monotonic, even if not coherent.
*/
- u32 (*get_seqno)(struct intel_engine_cs *ring,
- bool lazy_coherency);
+ void (*irq_seqno_barrier)(struct intel_engine_cs *ring);
+ u32 (*get_seqno)(struct intel_engine_cs *ring);
void (*set_seqno)(struct intel_engine_cs *ring,
u32 seqno);
int (*dispatch_execbuffer)(struct drm_i915_gem_request *req,
--
2.7.0
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