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path: root/drivers/gpu/drm/i915/gt/intel_ring_submission.c
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Diffstat (limited to 'drivers/gpu/drm/i915/gt/intel_ring_submission.c')
-rw-r--r--drivers/gpu/drm/i915/gt/intel_ring_submission.c82
1 files changed, 58 insertions, 24 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_ring_submission.c b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
index 92085ffd23de..a876a34455f1 100644
--- a/drivers/gpu/drm/i915/gt/intel_ring_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
@@ -26,6 +26,7 @@
#include "shmem_utils.h"
#include "intel_engine_heartbeat.h"
#include "intel_engine_pm.h"
+#include "intel_gt_print.h"
/* Rough estimate of the typical request size, performing a flush,
* set-context and then emitting the batch.
@@ -192,6 +193,7 @@ static bool stop_ring(struct intel_engine_cs *engine)
static int xcs_resume(struct intel_engine_cs *engine)
{
struct intel_ring *ring = engine->legacy.ring;
+ ktime_t kt;
ENGINE_TRACE(engine, "ring:{HEAD:%04x, TAIL:%04x}\n",
ring->head, ring->tail);
@@ -229,10 +231,33 @@ static int xcs_resume(struct intel_engine_cs *engine)
set_pp_dir(engine);
- /* First wake the ring up to an empty/idle ring */
- ENGINE_WRITE_FW(engine, RING_HEAD, ring->head);
+ /*
+ * First wake the ring up to an empty/idle ring.
+ * Use 50ms of delay to let the engine write successfully
+ * for all platforms. Experimented with different values and
+ * determined that 50ms works best based on testing.
+ */
+ for ((kt) = ktime_get() + (50 * NSEC_PER_MSEC);
+ ktime_before(ktime_get(), (kt)); cpu_relax()) {
+ /*
+ * In case of resets fails because engine resumes from
+ * incorrect RING_HEAD and then GPU may be then fed
+ * to invalid instructions, which may lead to unrecoverable
+ * hang. So at first write doesn't succeed then try again.
+ */
+ ENGINE_WRITE_FW(engine, RING_HEAD, ring->head);
+ if (ENGINE_READ_FW(engine, RING_HEAD) == ring->head)
+ break;
+ }
+
ENGINE_WRITE_FW(engine, RING_TAIL, ring->head);
- ENGINE_POSTING_READ(engine, RING_TAIL);
+ if (ENGINE_READ_FW(engine, RING_HEAD) != ENGINE_READ_FW(engine, RING_TAIL)) {
+ ENGINE_TRACE(engine, "failed to reset empty ring: [%x, %x]: %x\n",
+ ENGINE_READ_FW(engine, RING_HEAD),
+ ENGINE_READ_FW(engine, RING_TAIL),
+ ring->head);
+ goto err;
+ }
ENGINE_WRITE_FW(engine, RING_CTL,
RING_CTL_SIZE(ring->size) | RING_VALID);
@@ -241,12 +266,16 @@ 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))
+ 5000, 0, NULL)) {
+ ENGINE_TRACE(engine, "failed to restart\n");
goto err;
+ }
- if (GRAPHICS_VER(engine->i915) > 2)
+ if (GRAPHICS_VER(engine->i915) > 2) {
ENGINE_WRITE_FW(engine,
RING_MI_MODE, _MASKED_BIT_DISABLE(STOP_RING));
+ ENGINE_POSTING_READ(engine, RING_MI_MODE);
+ }
/* Now awake, let it get started */
if (ring->tail != ring->head) {
@@ -259,16 +288,16 @@ static int xcs_resume(struct intel_engine_cs *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));
+ gt_err(engine->gt, "%s initialization failed\n", engine->name);
+ ENGINE_TRACE(engine,
+ "ctl %08x (valid? %d) head %08x [%08x] tail %08x [%08x] start %08x [expected %08x]\n",
+ 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));
+ GEM_TRACE_DUMP();
return -EIO;
}
@@ -336,7 +365,13 @@ static void reset_prepare(struct intel_engine_cs *engine)
ENGINE_READ_FW(engine, RING_HEAD),
ENGINE_READ_FW(engine, RING_TAIL),
ENGINE_READ_FW(engine, RING_START));
- if (!stop_ring(engine)) {
+ /*
+ * Sometimes engine head failed to set to zero even after writing into it.
+ * Use wait_for_atomic() with 20ms delay to let engine resumes from
+ * correct RING_HEAD. Experimented different values and determined
+ * that 20ms works best based on testing.
+ */
+ if (wait_for_atomic((!stop_ring(engine) == 0), 20)) {
drm_err(&engine->i915->drm,
"failed to set %s head to zero "
"ctl %08x head %08x tail %08x start %08x\n",
@@ -474,8 +509,7 @@ static int ring_context_init_default_state(struct intel_context *ce,
if (IS_ERR(vaddr))
return PTR_ERR(vaddr);
- shmem_read(ce->engine->default_state, 0,
- vaddr, ce->engine->context_size);
+ shmem_read(ce->default_state, 0, vaddr, ce->engine->context_size);
i915_gem_object_flush_map(obj);
__i915_gem_object_release_map(obj);
@@ -491,7 +525,7 @@ static int ring_context_pre_pin(struct intel_context *ce,
struct i915_address_space *vm;
int err = 0;
- if (ce->engine->default_state &&
+ if (ce->default_state &&
!test_bit(CONTEXT_VALID_BIT, &ce->flags)) {
err = ring_context_init_default_state(ce, ww);
if (err)
@@ -570,6 +604,9 @@ static int ring_context_alloc(struct intel_context *ce)
{
struct intel_engine_cs *engine = ce->engine;
+ if (!intel_context_has_own_state(ce))
+ ce->default_state = engine->default_state;
+
/* One ringbuffer to rule them all */
GEM_BUG_ON(!engine->legacy.ring);
ce->ring = engine->legacy.ring;
@@ -1088,9 +1125,6 @@ static void setup_irq(struct intel_engine_cs *engine)
} else if (GRAPHICS_VER(i915) >= 5) {
engine->irq_enable = gen5_irq_enable;
engine->irq_disable = gen5_irq_disable;
- } else if (GRAPHICS_VER(i915) >= 3) {
- engine->irq_enable = gen3_irq_enable;
- engine->irq_disable = gen3_irq_disable;
} else {
engine->irq_enable = gen2_irq_enable;
engine->irq_disable = gen2_irq_disable;
@@ -1144,7 +1178,7 @@ static void setup_common(struct intel_engine_cs *engine)
* equivalent to our next initial bread so we can elide
* engine->emit_init_breadcrumb().
*/
- engine->emit_fini_breadcrumb = gen3_emit_breadcrumb;
+ engine->emit_fini_breadcrumb = gen2_emit_breadcrumb;
if (GRAPHICS_VER(i915) == 5)
engine->emit_fini_breadcrumb = gen5_emit_breadcrumb;
@@ -1157,7 +1191,7 @@ static void setup_common(struct intel_engine_cs *engine)
else if (IS_I830(i915) || IS_I845G(i915))
engine->emit_bb_start = i830_emit_bb_start;
else
- engine->emit_bb_start = gen3_emit_bb_start;
+ engine->emit_bb_start = gen2_emit_bb_start;
}
static void setup_rcs(struct intel_engine_cs *engine)
generated by cgit (git 2.34.1) at 2025-07-23 23:06:15 +0000