Push the sleeping stop_ring() out of the reset resume function to reset
prepare; we are not allowed to sleep in the former.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
.../gpu/drm/i915/gt/intel_ring_submission.c | 97 +++++++------------
1 file changed, 36 insertions(+), 61 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_ring_submission.c
b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
index 8d0964d2d597..44159595d909 100644
--- a/drivers/gpu/drm/i915/gt/intel_ring_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
@@ -157,21 +157,6 @@ static void ring_setup_status_page(struct intel_engine_cs
*engine)
flush_cs_tlb(engine);
}
-static bool stop_ring(struct intel_engine_cs *engine)
-{
- intel_engine_stop_cs(engine);
-
- ENGINE_WRITE(engine, RING_HEAD, ENGINE_READ(engine, RING_TAIL));
-
- ENGINE_WRITE(engine, RING_HEAD, 0);
- ENGINE_WRITE(engine, RING_TAIL, 0);
-
- /* The ring must be empty before it is disabled */
- ENGINE_WRITE(engine, RING_CTL, 0);
-
- return (ENGINE_READ(engine, RING_HEAD) & HEAD_ADDR) == 0;
-}
-
static struct i915_address_space *vm_alias(struct i915_address_space *vm)
{
if (i915_is_ggtt(vm))
@@ -213,31 +198,6 @@ static int xcs_resume(struct intel_engine_cs *engine)
intel_uncore_forcewake_get(engine->uncore, FORCEWAKE_ALL);
- /* WaClearRingBufHeadRegAtInit:ctg,elk */
- if (!stop_ring(engine)) {
- /* G45 ring initialization often fails to reset head to zero */
- drm_dbg(&dev_priv->drm, "%s head not reset to zero "
- "ctl %08x head %08x tail %08x start %08x\n",
- engine->name,
- ENGINE_READ(engine, RING_CTL),
- ENGINE_READ(engine, RING_HEAD),
- ENGINE_READ(engine, RING_TAIL),
- ENGINE_READ(engine, RING_START));
-
- if (!stop_ring(engine)) {
- drm_err(&dev_priv->drm,
- "failed to set %s head to zero "
- "ctl %08x head %08x tail %08x start %08x\n",
- engine->name,
- ENGINE_READ(engine, RING_CTL),
- ENGINE_READ(engine, RING_HEAD),
- ENGINE_READ(engine, RING_TAIL),
- ENGINE_READ(engine, RING_START));
- ret = -EIO;
- goto out;
- }
- }
-
if (HWS_NEEDS_PHYSICAL(dev_priv))
ring_setup_phys_status_page(engine);
else
@@ -339,11 +299,21 @@ 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)
+{
+ ENGINE_WRITE_FW(engine, RING_HEAD, ENGINE_READ_FW(engine, RING_TAIL));
+
+ ENGINE_WRITE_FW(engine, RING_HEAD, 0);
+ ENGINE_WRITE_FW(engine, RING_TAIL, 0);
+
+ /* The ring must be empty before it is disabled */
+ ENGINE_WRITE_FW(engine, RING_CTL, 0);
+
+ return (ENGINE_READ_FW(engine, RING_HEAD) & HEAD_ADDR) == 0;
+}
+
static void reset_prepare(struct intel_engine_cs *engine)
{
- struct intel_uncore *uncore = engine->uncore;
- const u32 base = engine->mmio_base;
-
/*
* We stop engines, otherwise we might get failed reset and a
* dead gpu (on elk). Also as modern gpu as kbl can suffer
@@ -355,30 +325,35 @@ static void reset_prepare(struct intel_engine_cs *engine)
* WaKBLVECSSemaphoreWaitPoll:kbl (on ALL_ENGINES)
*
* WaMediaResetMainRingCleanup:ctg,elk (presumably)
+ * WaClearRingBufHeadRegAtInit:ctg,elk
*
* FIXME: Wa for more modern gens needs to be validated
*/
ENGINE_TRACE(engine, "\n");
+ intel_engine_stop_cs(engine);
- if (intel_engine_stop_cs(engine))
- ENGINE_TRACE(engine, "timed out on STOP_RING\n");
+ 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));
+ }
- intel_uncore_write_fw(uncore,
- RING_HEAD(base),
- intel_uncore_read_fw(uncore, RING_TAIL(base)));
- intel_uncore_posting_read_fw(uncore, RING_HEAD(base)); /* paranoia */
-
- intel_uncore_write_fw(uncore, RING_HEAD(base), 0);
- intel_uncore_write_fw(uncore, RING_TAIL(base), 0);
- intel_uncore_posting_read_fw(uncore, RING_TAIL(base));
-
- /* The ring must be empty before it is disabled */
- intel_uncore_write_fw(uncore, RING_CTL(base), 0);
-
- /* Check acts as a post */
- if (intel_uncore_read_fw(uncore, RING_HEAD(base)))
- ENGINE_TRACE(engine, "ring head [%x] not parked\n",
- intel_uncore_read_fw(uncore, RING_HEAD(base)));
+ 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));
+ }
}
static void reset_rewind(struct intel_engine_cs *engine, bool stalled)
--
2.20.1
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