drm/i915: Extract "emit write" part of emit breadcrumb functions

Let's separate the "emit" part from touching any internal structures,
this way we can have a generic "emit coherent GGTT write" function.
We would like to reuse this functionality for emitting HWSP write, to
confirm that preempt-to-idle has finished.

v2: Reorder args to match emit_pipe_control, s/render/rcs (Chris)

Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171025200020.16636-8-michal.winiarski@intel.com

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index e821c1e..599c709 100644 (file)
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1794,10 +1794,8 @@ static void gen8_emit_breadcrumb(struct drm_i915_gem_request *request, u32 *cs)
        /* w/a: bit 5 needs to be zero for MI_FLUSH_DW address. */
        BUILD_BUG_ON(I915_GEM_HWS_INDEX_ADDR & (1 << 5));
 
-       *cs++ = (MI_FLUSH_DW + 1) | MI_FLUSH_DW_OP_STOREDW;
-       *cs++ = intel_hws_seqno_address(request->engine) | MI_FLUSH_DW_USE_GTT;
-       *cs++ = 0;
-       *cs++ = request->global_seqno;
+       cs = gen8_emit_ggtt_write(cs, request->global_seqno,
+                                 intel_hws_seqno_address(request->engine));
        *cs++ = MI_USER_INTERRUPT;
        *cs++ = MI_NOOP;
        request->tail = intel_ring_offset(request, cs);
@@ -1807,24 +1805,14 @@ static void gen8_emit_breadcrumb(struct drm_i915_gem_request *request, u32 *cs)
 }
 static const int gen8_emit_breadcrumb_sz = 6 + WA_TAIL_DWORDS;
 
-static void gen8_emit_breadcrumb_render(struct drm_i915_gem_request *request,
+static void gen8_emit_breadcrumb_rcs(struct drm_i915_gem_request *request,
                                        u32 *cs)
 {
        /* We're using qword write, seqno should be aligned to 8 bytes. */
        BUILD_BUG_ON(I915_GEM_HWS_INDEX & 1);
 
-       /* w/a for post sync ops following a GPGPU operation we
-        * need a prior CS_STALL, which is emitted by the flush
-        * following the batch.
-        */
-       *cs++ = GFX_OP_PIPE_CONTROL(6);
-       *cs++ = PIPE_CONTROL_GLOBAL_GTT_IVB | PIPE_CONTROL_CS_STALL |
-               PIPE_CONTROL_QW_WRITE;
-       *cs++ = intel_hws_seqno_address(request->engine);
-       *cs++ = 0;
-       *cs++ = request->global_seqno;
-       /* We're thrashing one dword of HWS. */
-       *cs++ = 0;
+       cs = gen8_emit_ggtt_write_rcs(cs, request->global_seqno,
+                                     intel_hws_seqno_address(request->engine));
        *cs++ = MI_USER_INTERRUPT;
        *cs++ = MI_NOOP;
        request->tail = intel_ring_offset(request, cs);
@@ -1832,7 +1820,7 @@ static void gen8_emit_breadcrumb_render(struct drm_i915_gem_request *request,
 
        gen8_emit_wa_tail(request, cs);
 }
-static const int gen8_emit_breadcrumb_render_sz = 8 + WA_TAIL_DWORDS;
+static const int gen8_emit_breadcrumb_rcs_sz = 8 + WA_TAIL_DWORDS;
 
 static int gen8_init_rcs_context(struct drm_i915_gem_request *req)
 {
@@ -1991,8 +1979,8 @@ int logical_render_ring_init(struct intel_engine_cs *engine)
                engine->init_hw = gen8_init_render_ring;
        engine->init_context = gen8_init_rcs_context;
        engine->emit_flush = gen8_emit_flush_render;
-       engine->emit_breadcrumb = gen8_emit_breadcrumb_render;
-       engine->emit_breadcrumb_sz = gen8_emit_breadcrumb_render_sz;
+       engine->emit_breadcrumb = gen8_emit_breadcrumb_rcs;
+       engine->emit_breadcrumb_sz = gen8_emit_breadcrumb_rcs_sz;
 
        ret = intel_engine_create_scratch(engine, PAGE_SIZE);
        if (ret)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index e5a0d48..c15161e 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -869,6 +869,44 @@ static inline u32 *gen8_emit_pipe_control(u32 *batch, u32 flags, u32 offset)
        return batch + 6;
 }
 
+static inline u32 *
+gen8_emit_ggtt_write_rcs(u32 *cs, u32 value, u32 gtt_offset)
+{
+       /* We're using qword write, offset should be aligned to 8 bytes. */
+       GEM_BUG_ON(!IS_ALIGNED(gtt_offset, 8));
+
+       /* w/a for post sync ops following a GPGPU operation we
+        * need a prior CS_STALL, which is emitted by the flush
+        * following the batch.
+        */
+       *cs++ = GFX_OP_PIPE_CONTROL(6);
+       *cs++ = PIPE_CONTROL_GLOBAL_GTT_IVB | PIPE_CONTROL_CS_STALL |
+               PIPE_CONTROL_QW_WRITE;
+       *cs++ = gtt_offset;
+       *cs++ = 0;
+       *cs++ = value;
+       /* We're thrashing one dword of HWS. */
+       *cs++ = 0;
+
+       return cs;
+}
+
+static inline u32 *
+gen8_emit_ggtt_write(u32 *cs, u32 value, u32 gtt_offset)
+{
+       /* w/a: bit 5 needs to be zero for MI_FLUSH_DW address. */
+       GEM_BUG_ON(gtt_offset & (1 << 5));
+       /* Offset should be aligned to 8 bytes for both (QW/DW) write types */
+       GEM_BUG_ON(!IS_ALIGNED(gtt_offset, 8));
+
+       *cs++ = (MI_FLUSH_DW + 1) | MI_FLUSH_DW_OP_STOREDW;
+       *cs++ = gtt_offset | MI_FLUSH_DW_USE_GTT;
+       *cs++ = 0;
+       *cs++ = value;
+
+       return cs;
+}
+
 bool intel_engine_is_idle(struct intel_engine_cs *engine);
 bool intel_engines_are_idle(struct drm_i915_private *dev_priv);