[PATCH v2 4/4] drm/amdgpu/sdma5.2: implement ring reset callback for sdma5.2

[jiadong.zhu at amd.com]

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

Implement sdma queue reset callback via MMIO.

v2: enter/exit safemode for mmio queue reset.

Signed-off-by: Jiadong Zhu <Jiadong.Zhu at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c | 91 ++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c b/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c
index 37534c6f431f..8e8f8be01539 100644
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c
@@ -1424,6 +1424,96 @@ static int sdma_v5_2_wait_for_idle(void *handle)
 	return -ETIMEDOUT;
 }
 
+static int sdma_v5_2_reset_queue(struct amdgpu_ring *ring, unsigned int vmid)
+{
+	struct amdgpu_device *adev = ring->adev;
+	int i, j, r;
+	u32 rb_cntl, ib_cntl, f32_cntl, freeze, cntl, preempt, soft_reset, stat1_reg;
+
+	if (amdgpu_sriov_vf(adev))
+		return -EINVAL;
+
+	for (i = 0; i < adev->sdma.num_instances; i++) {
+		if (ring == &adev->sdma.instance[i].ring)
+			break;
+	}
+
+	if (i == adev->sdma.num_instances) {
+		DRM_ERROR("sdma instance not found\n");
+		return -EINVAL;
+	}
+
+	amdgpu_gfx_rlc_enter_safe_mode(adev, 0);
+
+	/* stop queue */
+	ib_cntl = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_IB_CNTL));
+	ib_cntl = REG_SET_FIELD(ib_cntl, SDMA0_GFX_IB_CNTL, IB_ENABLE, 0);
+	WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_IB_CNTL), ib_cntl);
+
+	rb_cntl = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_CNTL));
+	rb_cntl = REG_SET_FIELD(rb_cntl, SDMA0_GFX_RB_CNTL, RB_ENABLE, 0);
+	WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_RB_CNTL), rb_cntl);
+
+	/*engine stop SDMA1_F32_CNTL.HALT to 1 and SDMAx_FREEZE freeze bit to 1 */
+	freeze = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_FREEZE));
+	freeze = REG_SET_FIELD(freeze, SDMA0_FREEZE, FREEZE, 1);
+	WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_FREEZE), freeze);
+
+	for (j = 0; j < adev->usec_timeout; j++) {
+		freeze = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_FREEZE));
+
+		if (REG_GET_FIELD(freeze, SDMA0_FREEZE, FROZEN) & 1)
+			break;
+		udelay(1);
+	}
+
+
+	if (j == adev->usec_timeout) {
+		stat1_reg = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_STATUS1_REG));
+		if ((stat1_reg & 0x3FF) != 0x3FF) {
+			DRM_ERROR("cannot soft reset as sdma not idle\n");
+			r = -ETIMEDOUT;
+			goto err0;
+		}
+	}
+
+	f32_cntl = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_F32_CNTL));
+	f32_cntl = REG_SET_FIELD(f32_cntl, SDMA0_F32_CNTL, HALT, 1);
+	WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_F32_CNTL), f32_cntl);
+
+	cntl = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_CNTL));
+	cntl = REG_SET_FIELD(cntl, SDMA0_CNTL, UTC_L1_ENABLE, 0);
+	WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_CNTL), cntl);
+
+	/* soft reset SDMA_GFX_PREEMPT.IB_PREEMPT = 0 mmGRBM_SOFT_RESET.SOFT_RESET_SDMA0/1 = 1 */
+	preempt = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_PREEMPT));
+	preempt = REG_SET_FIELD(preempt, SDMA0_GFX_PREEMPT, IB_PREEMPT, 0);
+	WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_GFX_PREEMPT), preempt);
+
+	soft_reset = RREG32_SOC15(GC, 0, mmGRBM_SOFT_RESET);
+	soft_reset |= 1 << GRBM_SOFT_RESET__SOFT_RESET_SDMA0__SHIFT << i;
+
+
+	WREG32_SOC15(GC, 0, mmGRBM_SOFT_RESET, soft_reset);
+
+	udelay(50);
+
+	soft_reset &= ~(1 << GRBM_SOFT_RESET__SOFT_RESET_SDMA0__SHIFT << i);
+
+	WREG32_SOC15(GC, 0, mmGRBM_SOFT_RESET, soft_reset);
+
+	/* unfreeze and unhalt */
+	freeze = RREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_FREEZE));
+	freeze = REG_SET_FIELD(freeze, SDMA0_FREEZE, FREEZE, 0);
+	WREG32(sdma_v5_2_get_reg_offset(adev, i, mmSDMA0_FREEZE), freeze);
+
+	r = sdma_v5_2_gfx_resume_instance(adev, i, true);
+
+err0:
+	amdgpu_gfx_rlc_exit_safe_mode(adev, 0);
+	return r;
+}
+
 static int sdma_v5_2_ring_preempt_ib(struct amdgpu_ring *ring)
 {
 	int i, r = 0;
@@ -1859,6 +1949,7 @@ static const struct amdgpu_ring_funcs sdma_v5_2_ring_funcs = {
 	.emit_reg_write_reg_wait = sdma_v5_2_ring_emit_reg_write_reg_wait,
 	.init_cond_exec = sdma_v5_2_ring_init_cond_exec,
 	.preempt_ib = sdma_v5_2_ring_preempt_ib,
+	.reset = sdma_v5_2_reset_queue,
 };
 
 static void sdma_v5_2_set_ring_funcs(struct amdgpu_device *adev)
-- 
2.25.1