[Intel-gfx] [PATCH 6/8] drm/i915/gt: Pull ring submission resume under its caller forcewake
Chris Wilson
chris at chris-wilson.co.uk
Tue Jan 5 00:54:37 UTC 2021
Take advantage of calling xcs_resume under a forcewake by using direct
mmio access. In particular, we can avoid the sleeping variants to allow
resume to be called from softirq context, required for engine resets.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
.../gpu/drm/i915/gt/intel_ring_submission.c | 98 ++++++++-----------
1 file changed, 43 insertions(+), 55 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_ring_submission.c b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
index 7c31126a1b6d..77aec0a94541 100644
--- a/drivers/gpu/drm/i915/gt/intel_ring_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
@@ -121,31 +121,27 @@ static void set_hwsp(struct intel_engine_cs *engine, u32 offset)
hwsp = RING_HWS_PGA(engine->mmio_base);
}
- intel_uncore_write(engine->uncore, hwsp, offset);
- intel_uncore_posting_read(engine->uncore, hwsp);
+ intel_uncore_write_fw(engine->uncore, hwsp, offset);
+ intel_uncore_posting_read_fw(engine->uncore, hwsp);
}
static void flush_cs_tlb(struct intel_engine_cs *engine)
{
- struct drm_i915_private *dev_priv = engine->i915;
-
- if (!IS_GEN_RANGE(dev_priv, 6, 7))
+ if (!IS_GEN_RANGE(engine->i915, 6, 7))
return;
/* ring should be idle before issuing a sync flush*/
- drm_WARN_ON(&dev_priv->drm,
- (ENGINE_READ(engine, RING_MI_MODE) & MODE_IDLE) == 0);
-
- ENGINE_WRITE(engine, RING_INSTPM,
- _MASKED_BIT_ENABLE(INSTPM_TLB_INVALIDATE |
- INSTPM_SYNC_FLUSH));
- if (intel_wait_for_register(engine->uncore,
- RING_INSTPM(engine->mmio_base),
- INSTPM_SYNC_FLUSH, 0,
- 1000))
- drm_err(&dev_priv->drm,
- "%s: wait for SyncFlush to complete for TLB invalidation timed out\n",
- engine->name);
+ GEM_DEBUG_WARN_ON((ENGINE_READ(engine, RING_MI_MODE) & MODE_IDLE) == 0);
+
+ ENGINE_WRITE_FW(engine, RING_INSTPM,
+ _MASKED_BIT_ENABLE(INSTPM_TLB_INVALIDATE |
+ INSTPM_SYNC_FLUSH));
+ if (__intel_wait_for_register_fw(engine->uncore,
+ RING_INSTPM(engine->mmio_base),
+ INSTPM_SYNC_FLUSH, 0,
+ 2000, 0, NULL))
+ ENGINE_TRACE(engine,
+ "wait for SyncFlush to complete for TLB invalidation timed out\n");
}
static void ring_setup_status_page(struct intel_engine_cs *engine)
@@ -176,13 +172,13 @@ static void set_pp_dir(struct intel_engine_cs *engine)
if (!vm)
return;
- ENGINE_WRITE(engine, RING_PP_DIR_DCLV, PP_DIR_DCLV_2G);
- ENGINE_WRITE(engine, RING_PP_DIR_BASE, pp_dir(vm));
+ ENGINE_WRITE_FW(engine, RING_PP_DIR_DCLV, PP_DIR_DCLV_2G);
+ ENGINE_WRITE_FW(engine, RING_PP_DIR_BASE, pp_dir(vm));
if (INTEL_GEN(engine->i915) >= 7) {
- ENGINE_WRITE(engine,
- RING_MODE_GEN7,
- _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE));
+ ENGINE_WRITE_FW(engine,
+ RING_MODE_GEN7,
+ _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE));
}
}
@@ -190,13 +186,10 @@ static int xcs_resume(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
struct intel_ring *ring = engine->legacy.ring;
- int ret = 0;
ENGINE_TRACE(engine, "ring:{HEAD:%04x, TAIL:%04x}\n",
ring->head, ring->tail);
- intel_uncore_forcewake_get(engine->uncore, FORCEWAKE_ALL);
-
if (HWS_NEEDS_PHYSICAL(dev_priv))
ring_setup_phys_status_page(engine);
else
@@ -204,16 +197,13 @@ static int xcs_resume(struct intel_engine_cs *engine)
intel_breadcrumbs_reset(engine->breadcrumbs);
- /* Enforce ordering by reading HEAD register back */
- ENGINE_POSTING_READ(engine, RING_HEAD);
-
/*
* Initialize the ring. This must happen _after_ we've cleared the ring
* registers with the above sequence (the readback of the HEAD registers
* also enforces ordering), otherwise the hw might lose the new ring
* register values.
*/
- ENGINE_WRITE(engine, RING_START, i915_ggtt_offset(ring->vma));
+ ENGINE_WRITE_FW(engine, RING_START, i915_ggtt_offset(ring->vma));
/* Check that the ring offsets point within the ring! */
GEM_BUG_ON(!intel_ring_offset_valid(ring, ring->head));
@@ -223,46 +213,44 @@ 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(engine, RING_HEAD, ring->head);
- ENGINE_WRITE(engine, RING_TAIL, ring->head);
+ ENGINE_WRITE_FW(engine, RING_HEAD, ring->head);
+ ENGINE_WRITE_FW(engine, RING_TAIL, ring->head);
ENGINE_POSTING_READ(engine, RING_TAIL);
- ENGINE_WRITE(engine, RING_CTL, RING_CTL_SIZE(ring->size) | RING_VALID);
+ ENGINE_WRITE_FW(engine, RING_CTL,
+ RING_CTL_SIZE(ring->size) | RING_VALID);
/* If the head is still not zero, the ring is dead */
- if (intel_wait_for_register(engine->uncore,
- RING_CTL(engine->mmio_base),
- RING_VALID, RING_VALID,
- 50)) {
- 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));
- ret = -EIO;
- goto out;
+ 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;
}
if (INTEL_GEN(dev_priv) > 2)
- ENGINE_WRITE(engine,
- RING_MI_MODE, _MASKED_BIT_DISABLE(STOP_RING));
+ ENGINE_WRITE_FW(engine,
+ RING_MI_MODE, _MASKED_BIT_DISABLE(STOP_RING));
/* Now awake, let it get started */
if (ring->tail != ring->head) {
- ENGINE_WRITE(engine, RING_TAIL, ring->tail);
+ ENGINE_WRITE_FW(engine, RING_TAIL, ring->tail);
ENGINE_POSTING_READ(engine, RING_TAIL);
}
/* Papering over lost _interrupts_ immediately following the restart */
intel_engine_signal_breadcrumbs(engine);
-out:
- intel_uncore_forcewake_put(engine->uncore, FORCEWAKE_ALL);
-
- return ret;
+ return 0;
}
static void sanitize_hwsp(struct intel_engine_cs *engine)
--
2.20.1
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