drm/amdgpu/gfx9: Implement KGQ ring reset

GFX ring resets work differently on pre-GFX10 hardware since
there is no MQD managed by the scheduler.
For ring reset, you need issue the reset via CP_VMID_RESET
via KIQ or MMIO and submit the following to the gfx ring to
complete the reset:
1. EOP packet with EXEC bit set
2. WAIT_REG_MEM to wait for the fence
3. Clear CP_VMID_RESET to 0
4. EVENT_WRITE ENABLE_LEGACY_PIPELINE
5. EOP packet with EXEC bit set
6. WAIT_REG_MEM to wait for the fence
Once those commands have completed the reset should
be complete and the ring can accept new packets.

Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Tested-by: Jiqian Chen <Jiqian.Chen@amd.com> (v1)
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 89 insertions, 3 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index 0d8e797d59b8..7e9d753f4a80 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -2411,8 +2411,10 @@ static int gfx_v9_0_sw_init(struct amdgpu_ip_block *ip_block)
 		amdgpu_get_soft_full_reset_mask(&adev->gfx.gfx_ring[0]);
 	adev->gfx.compute_supported_reset =
 		amdgpu_get_soft_full_reset_mask(&adev->gfx.compute_ring[0]);
-	if (!amdgpu_sriov_vf(adev) && !adev->debug_disable_gpu_ring_reset)
+	if (!amdgpu_sriov_vf(adev) && !adev->debug_disable_gpu_ring_reset) {
 		adev->gfx.compute_supported_reset |= AMDGPU_RESET_TYPE_PER_QUEUE;
+		adev->gfx.gfx_supported_reset |= AMDGPU_RESET_TYPE_PER_QUEUE;
+	}
 
 	r = amdgpu_gfx_kiq_init(adev, GFX9_MEC_HPD_SIZE, 0);
 	if (r) {
@@ -7172,6 +7174,91 @@ static void gfx_v9_ring_insert_nop(struct amdgpu_ring *ring, uint32_t num_nop)
 	amdgpu_ring_insert_nop(ring, num_nop - 1);
 }
 
+static void gfx_v9_0_ring_emit_wreg_me(struct amdgpu_ring *ring,
+				       uint32_t reg,
+				       uint32_t val)
+{
+	uint32_t cmd = 0;
+
+	switch (ring->funcs->type) {
+	case AMDGPU_RING_TYPE_KIQ:
+		cmd = (1 << 16); /* no inc addr */
+		break;
+	default:
+		cmd = WR_CONFIRM;
+		break;
+	}
+	amdgpu_ring_write(ring, PACKET3(PACKET3_WRITE_DATA, 3));
+	amdgpu_ring_write(ring, cmd);
+	amdgpu_ring_write(ring, reg);
+	amdgpu_ring_write(ring, 0);
+	amdgpu_ring_write(ring, val);
+}
+
+static int gfx_v9_0_reset_kgq(struct amdgpu_ring *ring,
+			      unsigned int vmid,
+			      struct amdgpu_fence *timedout_fence)
+{
+	struct amdgpu_device *adev = ring->adev;
+	struct amdgpu_kiq *kiq = &adev->gfx.kiq[0];
+	struct amdgpu_ring *kiq_ring = &kiq->ring;
+	unsigned long flags;
+	u32 tmp;
+	int r;
+
+	amdgpu_ring_reset_helper_begin(ring, timedout_fence);
+
+	spin_lock_irqsave(&kiq->ring_lock, flags);
+
+	if (amdgpu_ring_alloc(kiq_ring, 5)) {
+		spin_unlock_irqrestore(&kiq->ring_lock, flags);
+		return -ENOMEM;
+	}
+
+	/* send the reset - 5 */
+	tmp = REG_SET_FIELD(0, CP_VMID_RESET, RESET_REQUEST, 1 << vmid);
+	gfx_v9_0_ring_emit_wreg(kiq_ring,
+				SOC15_REG_OFFSET(GC, 0, mmCP_VMID_RESET), tmp);
+	amdgpu_ring_commit(kiq_ring);
+	r = amdgpu_ring_test_ring(kiq_ring);
+	spin_unlock_irqrestore(&kiq->ring_lock, flags);
+	if (r)
+		return r;
+
+	if (amdgpu_ring_alloc(ring, 8 + 7 + 5 + 2 + 8 + 7))
+		return -ENOMEM;
+	/* emit the fence to finish the reset - 8 */
+	ring->trail_seq++;
+	gfx_v9_0_ring_emit_fence(ring, ring->trail_fence_gpu_addr,
+				 ring->trail_seq, AMDGPU_FENCE_FLAG_EXEC);
+	/* wait for the fence - 7 */
+	gfx_v9_0_wait_reg_mem(ring, 0, 1, 0,
+			      lower_32_bits(ring->trail_fence_gpu_addr),
+			      upper_32_bits(ring->trail_fence_gpu_addr),
+			      ring->trail_seq, 0xffffffff, 4);
+	/* clear mmCP_VMID_RESET - 5 */
+	gfx_v9_0_ring_emit_wreg_me(ring,
+				   SOC15_REG_OFFSET(GC, 0, mmCP_VMID_RESET), 0);
+	/* event write ENABLE_LEGACY_PIPELINE - 2 */
+	gfx_v9_0_ring_emit_event_write(ring, ENABLE_LEGACY_PIPELINE, 0);
+	/* emit a regular fence - 8 */
+	ring->trail_seq++;
+	gfx_v9_0_ring_emit_fence(ring, ring->trail_fence_gpu_addr,
+				 ring->trail_seq, AMDGPU_FENCE_FLAG_EXEC);
+	/* wait for the fence - 7 */
+	gfx_v9_0_wait_reg_mem(ring, 1, 1, 0,
+			      lower_32_bits(ring->trail_fence_gpu_addr),
+			      upper_32_bits(ring->trail_fence_gpu_addr),
+			      ring->trail_seq, 0xffffffff, 4);
+	amdgpu_ring_commit(ring);
+	/* wait for the commands to complete */
+	r = amdgpu_ring_test_ring(ring);
+	if (r)
+		return r;
+
+	return amdgpu_ring_reset_helper_end(ring, timedout_fence);
+}
+
 static int gfx_v9_0_reset_kcq(struct amdgpu_ring *ring,
 			      unsigned int vmid,
 			      struct amdgpu_fence *timedout_fence)
@@ -7450,9 +7537,9 @@ static const struct amdgpu_ring_funcs gfx_v9_0_ring_funcs_gfx = {
 	.emit_wreg = gfx_v9_0_ring_emit_wreg,
 	.emit_reg_wait = gfx_v9_0_ring_emit_reg_wait,
 	.emit_reg_write_reg_wait = gfx_v9_0_ring_emit_reg_write_reg_wait,
-	.soft_recovery = gfx_v9_0_ring_soft_recovery,
 	.emit_mem_sync = gfx_v9_0_emit_mem_sync,
 	.emit_cleaner_shader = gfx_v9_0_ring_emit_cleaner_shader,
+	.reset = gfx_v9_0_reset_kgq,
 	.begin_use = amdgpu_gfx_enforce_isolation_ring_begin_use,
 	.end_use = amdgpu_gfx_enforce_isolation_ring_end_use,
 };
@@ -7551,7 +7638,6 @@ static const struct amdgpu_ring_funcs gfx_v9_0_ring_funcs_compute = {
 	.emit_wreg = gfx_v9_0_ring_emit_wreg,
 	.emit_reg_wait = gfx_v9_0_ring_emit_reg_wait,
 	.emit_reg_write_reg_wait = gfx_v9_0_ring_emit_reg_write_reg_wait,
-	.soft_recovery = gfx_v9_0_ring_soft_recovery,
 	.emit_mem_sync = gfx_v9_0_emit_mem_sync,
 	.emit_wave_limit = gfx_v9_0_emit_wave_limit,
 	.reset = gfx_v9_0_reset_kcq,