[PATCH 30/53] drm/amdgpu/gfx9.4.3: implement reset_hw_queue for gfx9.4.3

[Alex Deucher]

From: Jiadong Zhu <Jiadong.Zhu at amd.com>

Using mmio to do queue reset. Enter safe mode
before writing mmio registers.

v2: set register instance offset according to xcc id.

Signed-off-by: Jiadong Zhu <Jiadong.Zhu at amd.com>
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c | 36 +++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c
index a0ff18dd4acf..221a7e1725c9 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c
@@ -71,6 +71,8 @@ static void gfx_v9_4_3_set_gds_init(struct amdgpu_device *adev);
 static void gfx_v9_4_3_set_rlc_funcs(struct amdgpu_device *adev);
 static int gfx_v9_4_3_get_cu_info(struct amdgpu_device *adev,
 				struct amdgpu_cu_info *cu_info);
+static void gfx_v9_4_3_xcc_set_safe_mode(struct amdgpu_device *adev, int xcc_id);
+static void gfx_v9_4_3_xcc_unset_safe_mode(struct amdgpu_device *adev, int xcc_id);
 
 static void gfx_v9_4_3_kiq_set_resources(struct amdgpu_ring *kiq_ring,
 				uint64_t queue_mask)
@@ -182,12 +184,46 @@ static void gfx_v9_4_3_kiq_invalidate_tlbs(struct amdgpu_ring *kiq_ring,
 			PACKET3_INVALIDATE_TLBS_FLUSH_TYPE(flush_type));
 }
 
+static void gfx_v9_4_3_kiq_reset_hw_queue(struct amdgpu_ring *kiq_ring, uint32_t queue_type,
+					  uint32_t me_id, uint32_t pipe_id, uint32_t queue_id,
+					  uint32_t xcc_id, uint32_t vmid)
+{
+	struct amdgpu_device *adev = kiq_ring->adev;
+	unsigned i;
+
+	/* enter save mode */
+	gfx_v9_4_3_xcc_set_safe_mode(adev, xcc_id);
+	mutex_lock(&adev->srbm_mutex);
+	soc15_grbm_select(adev, me_id, pipe_id, queue_id, 0, xcc_id);
+
+	if (queue_type == AMDGPU_RING_TYPE_COMPUTE) {
+		WREG32_SOC15(GC, GET_INST(GC, xcc_id), regCP_HQD_DEQUEUE_REQUEST, 0x2);
+		WREG32_SOC15(GC, GET_INST(GC, xcc_id), regSPI_COMPUTE_QUEUE_RESET, 0x1);
+		/* wait till dequeue take effects */
+		for (i = 0; i < adev->usec_timeout; i++) {
+			if (!(RREG32_SOC15(GC, GET_INST(GC, xcc_id), regCP_HQD_ACTIVE) & 1))
+				break;
+			udelay(1);
+		}
+		if (i >= adev->usec_timeout)
+			dev_err(adev->dev, "fail to wait on hqd deactive\n");
+	} else {
+		dev_err(adev->dev, "reset queue_type(%d) not supported\n\n", queue_type);
+	}
+
+	soc15_grbm_select(adev, 0, 0, 0, 0, 0);
+	mutex_unlock(&adev->srbm_mutex);
+	/* exit safe mode */
+	gfx_v9_4_3_xcc_unset_safe_mode(adev, xcc_id);
+}
+
 static const struct kiq_pm4_funcs gfx_v9_4_3_kiq_pm4_funcs = {
 	.kiq_set_resources = gfx_v9_4_3_kiq_set_resources,
 	.kiq_map_queues = gfx_v9_4_3_kiq_map_queues,
 	.kiq_unmap_queues = gfx_v9_4_3_kiq_unmap_queues,
 	.kiq_query_status = gfx_v9_4_3_kiq_query_status,
 	.kiq_invalidate_tlbs = gfx_v9_4_3_kiq_invalidate_tlbs,
+	.kiq_reset_hw_queue = gfx_v9_4_3_kiq_reset_hw_queue,
 	.set_resources_size = 8,
 	.map_queues_size = 7,
 	.unmap_queues_size = 6,
-- 
2.45.2