[PATCH 02/11] drm/amdgpu/gfx6: Fixup emitting SWITCH_BUFFER packets

["Timur Kristóf" <timur.kristof@gmail.com>]

Implement the emit_switch_buffer() function instead of emitting
them duing emit_ib, emit_pipeline_sync and emit_vm_flush.

Note that it isn't necessary to emit these in both
emit_pipeline_sync() and emit_vm_flush() because
amdgpu_vm_flush() already calls these when calling
either of those functions.

Fixes: 2cd46ad22383 ("drm/amdgpu: add graphic pipeline implementation for si v8")
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c | 38 ++++++++++-----------------
 1 file changed, 14 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c
index 6d7baee04372..1a9866e40912 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c
@@ -1926,12 +1926,6 @@ static void gfx_v6_0_ring_emit_ib(struct amdgpu_ring *ring,
 	unsigned vmid = AMDGPU_JOB_GET_VMID(job);
 	u32 header, control = 0;
 
-	/* insert SWITCH_BUFFER packet before first IB in the ring frame */
-	if (flags & AMDGPU_HAVE_CTX_SWITCH) {
-		amdgpu_ring_write(ring, PACKET3(PACKET3_SWITCH_BUFFER, 0));
-		amdgpu_ring_write(ring, 0);
-	}
-
 	if (ib->flags & AMDGPU_IB_FLAG_CE)
 		header = PACKET3(PACKET3_INDIRECT_BUFFER_CONST, 2);
 	else
@@ -2366,14 +2360,6 @@ static void gfx_v6_0_ring_emit_pipeline_sync(struct amdgpu_ring *ring)
 	amdgpu_ring_write(ring, seq);
 	amdgpu_ring_write(ring, 0xffffffff);
 	amdgpu_ring_write(ring, 4); /* poll interval */
-
-	if (usepfp) {
-		/* synce CE with ME to prevent CE fetch CEIB before context switch done */
-		amdgpu_ring_write(ring, PACKET3(PACKET3_SWITCH_BUFFER, 0));
-		amdgpu_ring_write(ring, 0);
-		amdgpu_ring_write(ring, PACKET3(PACKET3_SWITCH_BUFFER, 0));
-		amdgpu_ring_write(ring, 0);
-	}
 }
 
 static void gfx_v6_0_ring_emit_vm_flush(struct amdgpu_ring *ring,
@@ -2397,12 +2383,6 @@ static void gfx_v6_0_ring_emit_vm_flush(struct amdgpu_ring *ring,
 		/* sync PFP to ME, otherwise we might get invalid PFP reads */
 		amdgpu_ring_write(ring, PACKET3(PACKET3_PFP_SYNC_ME, 0));
 		amdgpu_ring_write(ring, 0x0);
-
-		/* synce CE with ME to prevent CE fetch CEIB before context switch done */
-		amdgpu_ring_write(ring, PACKET3(PACKET3_SWITCH_BUFFER, 0));
-		amdgpu_ring_write(ring, 0);
-		amdgpu_ring_write(ring, PACKET3(PACKET3_SWITCH_BUFFER, 0));
-		amdgpu_ring_write(ring, 0);
 	}
 }
 
@@ -2998,6 +2978,12 @@ static uint64_t gfx_v6_0_get_gpu_clock_counter(struct amdgpu_device *adev)
 	return clock;
 }
 
+static void gfx_v6_0_ring_emit_sb(struct amdgpu_ring *ring)
+{
+	amdgpu_ring_write(ring, PACKET3(PACKET3_SWITCH_BUFFER, 0));
+	amdgpu_ring_write(ring, 0);
+}
+
 static void gfx_v6_ring_emit_cntxcntl(struct amdgpu_ring *ring, uint32_t flags)
 {
 	u32 dw2 = 0x80000000; /* set load_enable otherwise this package is just NOPs */
@@ -3541,11 +3527,12 @@ static const struct amdgpu_ring_funcs gfx_v6_0_ring_funcs_gfx = {
 	.emit_frame_size =
 		5 + 5 + /* hdp flush / invalidate */
 		14 + 14 + 14 + /* gfx_v6_0_ring_emit_fence x3 for user fence, vm fence */
-		7 + 4 + /* gfx_v6_0_ring_emit_pipeline_sync */
-		SI_FLUSH_GPU_TLB_NUM_WREG * 5 + 7 + 6 + /* gfx_v6_0_ring_emit_vm_flush */
+		7 + /* gfx_v6_0_ring_emit_pipeline_sync */
+		SI_FLUSH_GPU_TLB_NUM_WREG * 5 + 7 + 2 + /* gfx_v6_0_ring_emit_vm_flush */
+		3 * 2 + /* gfx_v6_0_ring_emit_sb x3 (from amdgpu_vm_flush, amdgpu_ib_schedule) */
 		3 + 2 + 2 + /* gfx_v6_ring_emit_cntxcntl including VGT flush */
 		5, /* SURFACE_SYNC */
-	.emit_ib_size = 6, /* gfx_v6_0_ring_emit_ib */
+	.emit_ib_size = 4, /* gfx_v6_0_ring_emit_ib */
 	.emit_ib = gfx_v6_0_ring_emit_ib,
 	.emit_fence = gfx_v6_0_ring_emit_fence,
 	.emit_pipeline_sync = gfx_v6_0_ring_emit_pipeline_sync,
@@ -3553,6 +3540,7 @@ static const struct amdgpu_ring_funcs gfx_v6_0_ring_funcs_gfx = {
 	.test_ring = gfx_v6_0_ring_test_ring,
 	.test_ib = gfx_v6_0_ring_test_ib,
 	.insert_nop = amdgpu_ring_insert_nop,
+	.emit_switch_buffer = gfx_v6_0_ring_emit_sb,
 	.emit_cntxcntl = gfx_v6_ring_emit_cntxcntl,
 	.emit_wreg = gfx_v6_0_ring_emit_wreg,
 	.emit_mem_sync = gfx_v6_0_emit_mem_sync,
@@ -3570,8 +3558,9 @@ static const struct amdgpu_ring_funcs gfx_v6_0_ring_funcs_compute = {
 		7 + /* gfx_v6_0_ring_emit_pipeline_sync */
 		SI_FLUSH_GPU_TLB_NUM_WREG * 5 + 7 + /* gfx_v6_0_ring_emit_vm_flush */
 		14 + 14 + 14 + /* gfx_v6_0_ring_emit_fence x3 for user fence, vm fence */
+		3 * 2 + /* gfx_v6_0_ring_emit_sb x3 (from amdgpu_vm_flush, amdgpu_ib_schedule) */
 		5, /* SURFACE_SYNC */
-	.emit_ib_size = 6, /* gfx_v6_0_ring_emit_ib */
+	.emit_ib_size = 4, /* gfx_v6_0_ring_emit_ib */
 	.emit_ib = gfx_v6_0_ring_emit_ib,
 	.emit_fence = gfx_v6_0_ring_emit_fence,
 	.emit_pipeline_sync = gfx_v6_0_ring_emit_pipeline_sync,
@@ -3579,6 +3568,7 @@ static const struct amdgpu_ring_funcs gfx_v6_0_ring_funcs_compute = {
 	.test_ring = gfx_v6_0_ring_test_ring,
 	.test_ib = gfx_v6_0_ring_test_ib,
 	.insert_nop = amdgpu_ring_insert_nop,
+	.emit_switch_buffer = gfx_v6_0_ring_emit_sb,
 	.emit_wreg = gfx_v6_0_ring_emit_wreg,
 	.emit_mem_sync = gfx_v6_0_emit_mem_sync,
 };
-- 
2.55.0