For legacy ringbuffer mode, we need the new ordered breadcrumb emission
tried and tested on execlists in order to avoid the dreaded "missed
interrupt" syndrome. A secondary advantage of the execlists method is
that it writes to an arbitrary address, useful if one wants to write a
breadcrumb elsewhere.
This fix is taken from commit 7c17d377374dd (drm/i915: Use ordered seqno
write interrupt generation on gen8+ execlists).
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuopp...@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahti...@linux.intel.com>
---
drivers/gpu/drm/i915/intel_lrc.c | 10 +++-------
drivers/gpu/drm/i915/intel_ringbuffer.c | 32 ++++++++++++++++++++++++++++++--
drivers/gpu/drm/i915/intel_ringbuffer.h | 5 +++++
3 files changed, 38 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index ec2522243b5e..b2a9072c5753 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1767,11 +1767,6 @@ static void bxt_a_set_seqno(struct intel_engine_cs
*engine, u32 seqno)
*/
#define WA_TAIL_DWORDS 2
-static inline u32 hws_seqno_address(struct intel_engine_cs *engine)
-{
- return engine->status_page.gfx_addr + I915_GEM_HWS_INDEX_ADDR;
-}
-
static int gen8_emit_request(struct drm_i915_gem_request *request)
{
struct intel_ringbuffer *ringbuf = request->ringbuf;
@@ -1787,7 +1782,7 @@ static int gen8_emit_request(struct drm_i915_gem_request
*request)
intel_logical_ring_emit(ringbuf,
(MI_FLUSH_DW + 1) | MI_FLUSH_DW_OP_STOREDW);
intel_logical_ring_emit(ringbuf,
- hws_seqno_address(request->engine) |
+ intel_hws_seqno_address(request->engine) |
MI_FLUSH_DW_USE_GTT);
intel_logical_ring_emit(ringbuf, 0);
intel_logical_ring_emit(ringbuf, i915_gem_request_get_seqno(request));
@@ -1817,7 +1812,8 @@ static int gen8_emit_request_render(struct
drm_i915_gem_request *request)
(PIPE_CONTROL_GLOBAL_GTT_IVB |
PIPE_CONTROL_CS_STALL |
PIPE_CONTROL_QW_WRITE));
- intel_logical_ring_emit(ringbuf, hws_seqno_address(request->engine));
+ intel_logical_ring_emit(ringbuf,
+ intel_hws_seqno_address(request->engine));
intel_logical_ring_emit(ringbuf, 0);
intel_logical_ring_emit(ringbuf, i915_gem_request_get_seqno(request));
/* We're thrashing one dword of HWS. */
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c
b/drivers/gpu/drm/i915/intel_ringbuffer.c
index c7637ceec1f4..c1472d62b663 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1430,6 +1430,35 @@ gen6_add_request(struct drm_i915_gem_request *req)
return 0;
}
+static int
+gen8_render_add_request(struct drm_i915_gem_request *req)
+{
+ struct intel_engine_cs *engine = req->engine;
+ int ret;
+
+ if (engine->semaphore.signal)
+ ret = engine->semaphore.signal(req, 8);
+ else
+ ret = intel_ring_begin(req, 8);
+ if (ret)
+ return ret;
+
+ intel_ring_emit(engine, GFX_OP_PIPE_CONTROL(6));
+ intel_ring_emit(engine, (PIPE_CONTROL_GLOBAL_GTT_IVB |
+ PIPE_CONTROL_CS_STALL |
+ PIPE_CONTROL_QW_WRITE));
+ intel_ring_emit(engine, intel_hws_seqno_address(req->engine));
+ intel_ring_emit(engine, 0);
+ intel_ring_emit(engine, i915_gem_request_get_seqno(req));
+ /* We're thrashing one dword of HWS. */
+ intel_ring_emit(engine, 0);
+ intel_ring_emit(engine, MI_USER_INTERRUPT);
+ intel_ring_emit(engine, MI_NOOP);
+ __intel_ring_advance(engine);
+
+ return 0;
+}
+
static inline bool i915_gem_has_seqno_wrapped(struct drm_device *dev,
u32 seqno)
{
@@ -2751,12 +2780,11 @@ int intel_init_render_ring_buffer(struct drm_device
*dev)
}
engine->init_context = intel_rcs_ctx_init;
- engine->add_request = gen6_add_request;
+ engine->add_request = gen8_render_add_request;
engine->flush = gen8_render_ring_flush;
engine->irq_get = gen8_ring_get_irq;
engine->irq_put = gen8_ring_put_irq;
engine->irq_enable_mask = GT_RENDER_USER_INTERRUPT;
- engine->irq_seqno_barrier = gen6_seqno_barrier;
engine->get_seqno = ring_get_seqno;
engine->set_seqno = ring_set_seqno;
if (i915_semaphore_is_enabled(dev)) {
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h
b/drivers/gpu/drm/i915/intel_ringbuffer.h
index d7082124eee3..55b0438b2fa1 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -489,4 +489,9 @@ static inline u32 intel_ring_get_tail(struct
intel_ringbuffer *ringbuf)
*/
#define MIN_SPACE_FOR_ADD_REQUEST 336
+static inline u32 intel_hws_seqno_address(struct intel_engine_cs *engine)
+{
+ return engine->status_page.gfx_addr + I915_GEM_HWS_INDEX_ADDR;
+}
+
#endif /* _INTEL_RINGBUFFER_H_ */
--
2.8.1
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