[v3 6/7] drm/amd/amdgpu: Refactor SDMA v5.2 reset logic into stop_queue and restore_queue functions

[Jesse.zhang@amd.com]

From: "Jesse.zhang at amd.com" <Jesse.zhang at amd.com>

This patch refactors the SDMA v5.2 reset logic by splitting the `sdma_v5_2_reset_queue` function into two separate functions: `sdma_v5_2_stop_queue` and `sdma_v5_2_restore_queue`.
This change aligns with the new SDMA reset mechanism, where the reset process is divided into stopping the queue, performing the reset, and restoring the queue.

1. **Split `sdma_v5_2_reset_queue`**:
	- Extracted the queue stopping logic into `sdma_v5_2_stop_queue`.
	- Extracted the queue restoration logic into `sdma_v5_2_restore_queue`.
	- The soft reset step is now handled by the caller (`amdgpu_sdma_reset_engine`).

2. **Update Ring Functions**:
	- Added `stop_queue` and `start_queue` to the `sdma_v5_2_ring_funcs` structure to support the new reset mechanism.

v2: remove the suspend_user_queues param when calling amdgpu_sdma_reset_engine()
v3: Update stop_queue/start_queue function paramters to use ring pointer instead of device/instance(Christian)

Signed-off-by: Jesse Zhang <jesse.zhang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c | 42 +++++++++++++++-----------
 1 file changed, 25 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c b/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c
index 96b02c3e4993..d0b8a4976473 100644
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c
@@ -1439,18 +1439,24 @@ static int sdma_v5_2_wait_for_idle(struct amdgpu_ip_block *ip_block)
 static int sdma_v5_2_reset_queue(struct amdgpu_ring *ring, unsigned int vmid)
 {
 	struct amdgpu_device *adev = ring->adev;
-	int j, r;
-	u32 f32_cntl, freeze, cntl, preempt, soft_reset, stat1_reg;
-	u32 inst_id;
+	u32 inst_id = ring->me;
+
+	return amdgpu_sdma_reset_engine(adev, inst_id);
+}
+
+static int sdma_v5_2_stop_queue(struct amdgpu_ring *ring)
+{
+	int j, r = 0;
+	u32 f32_cntl, freeze, cntl, preempt, stat1_reg;
+	struct amdgpu_device *adev = ring->adev;
+	u32 inst_id = ring->me;
 
 	if (amdgpu_sriov_vf(adev))
 		return -EINVAL;
 
-	inst_id = ring->me;
 	amdgpu_gfx_rlc_enter_safe_mode(adev, 0);
-
 	/* stop queue */
-	sdma_v5_2_gfx_stop(adev, 1 << ring->me);
+	sdma_v5_2_gfx_stop(adev, 1 << inst_id);
 
 	/*engine stop SDMA1_F32_CNTL.HALT to 1 and SDMAx_FREEZE freeze bit to 1 */
 	freeze = RREG32(sdma_v5_2_get_reg_offset(adev, inst_id, mmSDMA0_FREEZE));
@@ -1488,18 +1494,19 @@ static int sdma_v5_2_reset_queue(struct amdgpu_ring *ring, unsigned int vmid)
 	preempt = REG_SET_FIELD(preempt, SDMA0_GFX_PREEMPT, IB_PREEMPT, 0);
 	WREG32(sdma_v5_2_get_reg_offset(adev, inst_id, mmSDMA0_GFX_PREEMPT), preempt);
 
-	soft_reset = RREG32_SOC15(GC, 0, mmGRBM_SOFT_RESET);
-	soft_reset |= 1 << GRBM_SOFT_RESET__SOFT_RESET_SDMA0__SHIFT << inst_id;
-
-
-	WREG32_SOC15(GC, 0, mmGRBM_SOFT_RESET, soft_reset);
-
-	udelay(50);
-
-	soft_reset &= ~(1 << GRBM_SOFT_RESET__SOFT_RESET_SDMA0__SHIFT << inst_id);
+err0:
+	amdgpu_gfx_rlc_exit_safe_mode(adev, 0);
+	return r;
+}
 
-	WREG32_SOC15(GC, 0, mmGRBM_SOFT_RESET, soft_reset);
+static int sdma_v5_2_restore_queue(struct amdgpu_ring *ring)
+{
+	u32 freeze;
+	int r;
+	struct amdgpu_device *adev = ring->adev;
+	u32 inst_id = ring->me;
 
+	amdgpu_gfx_rlc_enter_safe_mode(adev, 0);
 	/* unfreeze and unhalt */
 	freeze = RREG32(sdma_v5_2_get_reg_offset(adev, inst_id, mmSDMA0_FREEZE));
 	freeze = REG_SET_FIELD(freeze, SDMA0_FREEZE, FREEZE, 0);
@@ -1507,7 +1514,6 @@ static int sdma_v5_2_reset_queue(struct amdgpu_ring *ring, unsigned int vmid)
 
 	r = sdma_v5_2_gfx_resume_instance(adev, inst_id, true);
 
-err0:
 	amdgpu_gfx_rlc_exit_safe_mode(adev, 0);
 	return r;
 }
@@ -1947,6 +1953,8 @@ static const struct amdgpu_ring_funcs sdma_v5_2_ring_funcs = {
 	.init_cond_exec = sdma_v5_2_ring_init_cond_exec,
 	.preempt_ib = sdma_v5_2_ring_preempt_ib,
 	.reset = sdma_v5_2_reset_queue,
+	.stop_queue = sdma_v5_2_stop_queue,
+	.start_queue = sdma_v5_2_restore_queue,
 };
 
 static void sdma_v5_2_set_ring_funcs(struct amdgpu_device *adev)
-- 
2.25.1