For reasons I cannot explain, except to say this is Sandybridge after
all, call stop_ring() again dring ring resume in order to prevent
mysterious hard hangs.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
---
If this survives the night on my snb-2500, I declare victory.
---
.../gpu/drm/i915/gt/intel_ring_submission.c | 107 +++++++++---------
1 file changed, 55 insertions(+), 52 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_ring_submission.c b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
index 4984ff565424..7eef2c6c1ed0 100644
--- a/drivers/gpu/drm/i915/gt/intel_ring_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
@@ -183,15 +183,35 @@ static void set_pp_dir(struct intel_engine_cs *engine)
}
}
+static bool stop_ring(struct intel_engine_cs *engine)
+{
+ /* Empty the ring by skipping to the end */
+ ENGINE_WRITE_FW(engine, RING_HEAD, ENGINE_READ_FW(engine, RING_TAIL));
+ ENGINE_POSTING_READ(engine, RING_HEAD);
+
+ /* The ring must be empty before it is disabled */
+ ENGINE_WRITE_FW(engine, RING_CTL, 0);
+ ENGINE_POSTING_READ(engine, RING_CTL);
+
+ /* Then reset the disabled ring */
+ ENGINE_WRITE_FW(engine, RING_HEAD, 0);
+ ENGINE_WRITE_FW(engine, RING_TAIL, 0);
+
+ return (ENGINE_READ_FW(engine, RING_HEAD) & HEAD_ADDR) == 0;
+}
+
static int xcs_resume(struct intel_engine_cs *engine)
{
- struct drm_i915_private *dev_priv = engine->i915;
struct intel_ring *ring = engine->legacy.ring;
ENGINE_TRACE(engine, "ring:{HEAD:%04x, TAIL:%04x}\n",
ring->head, ring->tail);
- if (HWS_NEEDS_PHYSICAL(dev_priv))
+ /* Double check the ring is empty & disabled before we resume */
+ if (!stop_ring(engine))
+ goto err;
+
+ if (HWS_NEEDS_PHYSICAL(engine->i915))
ring_setup_phys_status_page(engine);
else
ring_setup_status_page(engine);
@@ -228,21 +248,10 @@ static int xcs_resume(struct intel_engine_cs *engine)
if (__intel_wait_for_register_fw(engine->uncore,
RING_CTL(engine->mmio_base),
RING_VALID, RING_VALID,
- 5000, 0, NULL)) {
- drm_err(&dev_priv->drm,
- "%s initialization failed; "
- "ctl %08x (valid? %d) head %08x [%08x] tail %08x [%08x] start %08x [expected %08x]\n",
- engine->name,
- ENGINE_READ(engine, RING_CTL),
- ENGINE_READ(engine, RING_CTL) & RING_VALID,
- ENGINE_READ(engine, RING_HEAD), ring->head,
- ENGINE_READ(engine, RING_TAIL), ring->tail,
- ENGINE_READ(engine, RING_START),
- i915_ggtt_offset(ring->vma));
- return -EIO;
- }
+ 5000, 0, NULL))
+ goto err;
- if (INTEL_GEN(dev_priv) > 2)
+ if (INTEL_GEN(engine->i915) > 2)
ENGINE_WRITE_FW(engine,
RING_MI_MODE, _MASKED_BIT_DISABLE(STOP_RING));
@@ -255,6 +264,19 @@ static int xcs_resume(struct intel_engine_cs *engine)
/* Papering over lost _interrupts_ immediately following the restart */
intel_engine_signal_breadcrumbs(engine);
return 0;
+
+err:
+ drm_err(&engine->i915->drm,
+ "%s initialization failed; "
+ "ctl %08x (valid? %d) head %08x [%08x] tail %08x [%08x] start %08x [expected %08x]\n",
+ engine->name,
+ ENGINE_READ(engine, RING_CTL),
+ ENGINE_READ(engine, RING_CTL) & RING_VALID,
+ ENGINE_READ(engine, RING_HEAD), ring->head,
+ ENGINE_READ(engine, RING_TAIL), ring->tail,
+ ENGINE_READ(engine, RING_START),
+ i915_ggtt_offset(ring->vma));
+ return -EIO;
}
static void sanitize_hwsp(struct intel_engine_cs *engine)
@@ -290,23 +312,6 @@ static void xcs_sanitize(struct intel_engine_cs *engine)
clflush_cache_range(engine->status_page.addr, PAGE_SIZE);
}
-static bool stop_ring(struct intel_engine_cs *engine)
-{
- /* Empty the ring by skipping to the end */
- ENGINE_WRITE_FW(engine, RING_HEAD, ENGINE_READ_FW(engine, RING_TAIL));
- ENGINE_POSTING_READ(engine, RING_HEAD);
-
- /* The ring must be empty before it is disabled */
- ENGINE_WRITE_FW(engine, RING_CTL, 0);
- ENGINE_POSTING_READ(engine, RING_CTL);
-
- /* Then reset the disabled ring */
- ENGINE_WRITE_FW(engine, RING_HEAD, 0);
- ENGINE_WRITE_FW(engine, RING_TAIL, 0);
-
- return (ENGINE_READ_FW(engine, RING_HEAD) & HEAD_ADDR) == 0;
-}
-
static void reset_prepare(struct intel_engine_cs *engine)
{
/*
@@ -329,25 +334,23 @@ static void reset_prepare(struct intel_engine_cs *engine)
if (!stop_ring(engine)) {
/* G45 ring initialization often fails to reset head to zero */
- drm_dbg(&engine->i915->drm,
- "%s head not reset to zero "
- "ctl %08x head %08x tail %08x start %08x\n",
- engine->name,
- ENGINE_READ_FW(engine, RING_CTL),
- ENGINE_READ_FW(engine, RING_HEAD),
- ENGINE_READ_FW(engine, RING_TAIL),
- ENGINE_READ_FW(engine, RING_START));
- }
-
- if (!stop_ring(engine)) {
- drm_err(&engine->i915->drm,
- "failed to set %s head to zero "
- "ctl %08x head %08x tail %08x start %08x\n",
- engine->name,
- ENGINE_READ_FW(engine, RING_CTL),
- ENGINE_READ_FW(engine, RING_HEAD),
- ENGINE_READ_FW(engine, RING_TAIL),
- ENGINE_READ_FW(engine, RING_START));
+ ENGINE_TRACE(engine,
+ "HEAD not reset to zero, "
+ "{ CTL:%08x, HEAD:%08x, TAIL:%08x, START:%08x }\n",
+ ENGINE_READ_FW(engine, RING_CTL),
+ ENGINE_READ_FW(engine, RING_HEAD),
+ ENGINE_READ_FW(engine, RING_TAIL),
+ ENGINE_READ_FW(engine, RING_START));
+ if (!stop_ring(engine)) {
+ drm_err(&engine->i915->drm,
+ "failed to set %s head to zero "
+ "ctl %08x head %08x tail %08x start %08x\n",
+ engine->name,
+ ENGINE_READ_FW(engine, RING_CTL),
+ ENGINE_READ_FW(engine, RING_HEAD),
+ ENGINE_READ_FW(engine, RING_TAIL),
+ ENGINE_READ_FW(engine, RING_START));
+ }
}
}
--
2.20.1
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