RE: [PATCH v2] drm/amdgpu: fix GRBM read timeout when do mes_self_test

["Zhang, Yifan" <Yifan1.Zhang@xxxxxxx>]

[AMD Official Use Only - General]

This patch is :

Reviewed-by: Yifan Zhang <yifan1.zhang@xxxxxxx>

-----Original Message-----
From: Huang, Tim <Tim.Huang@xxxxxxx>
Sent: Wednesday, November 1, 2023 4:53 PM
To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: Deucher, Alexander <Alexander.Deucher@xxxxxxx>; Zhang, Yifan <Yifan1.Zhang@xxxxxxx>; Xiao, Jack <Jack.Xiao@xxxxxxx>; Huang, Tim <Tim.Huang@xxxxxxx>
Subject: [PATCH v2] drm/amdgpu: fix GRBM read timeout when do mes_self_test

Use a proper MEID to make sure the CP_HQD_* and CP_GFX_HQD_* registers can be touched when initialize the compute and gfx mqd in mes_self_test.
Otherwise, we expect no response from CP and an GRBM eventual timeout.

Signed-off-by: Tim Huang <Tim.Huang@xxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c
index 70fe3b39c004..45280fb0e00c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c
@@ -556,8 +556,20 @@ static void amdgpu_mes_queue_init_mqd(struct amdgpu_device *adev,
        mqd_prop.hqd_queue_priority = p->hqd_queue_priority;
        mqd_prop.hqd_active = false;

+       if (p->queue_type == AMDGPU_RING_TYPE_GFX ||
+           p->queue_type == AMDGPU_RING_TYPE_COMPUTE) {
+               mutex_lock(&adev->srbm_mutex);
+               amdgpu_gfx_select_me_pipe_q(adev, p->ring->me, p->ring->pipe, 0, 0, 0);
+       }
+
        mqd_mgr->init_mqd(adev, q->mqd_cpu_ptr, &mqd_prop);

+       if (p->queue_type == AMDGPU_RING_TYPE_GFX ||
+           p->queue_type == AMDGPU_RING_TYPE_COMPUTE) {
+               amdgpu_gfx_select_me_pipe_q(adev, 0, 0, 0, 0, 0);
+               mutex_unlock(&adev->srbm_mutex);
+       }
+
        amdgpu_bo_unreserve(q->mqd_obj);
 }

@@ -993,9 +1005,13 @@ int amdgpu_mes_add_ring(struct amdgpu_device *adev, int gang_id,
        switch (queue_type) {
        case AMDGPU_RING_TYPE_GFX:
                ring->funcs = adev->gfx.gfx_ring[0].funcs;
+               ring->me = adev->gfx.gfx_ring[0].me;
+               ring->pipe = adev->gfx.gfx_ring[0].pipe;
                break;
        case AMDGPU_RING_TYPE_COMPUTE:
                ring->funcs = adev->gfx.compute_ring[0].funcs;
+               ring->me = adev->gfx.compute_ring[0].me;
+               ring->pipe = adev->gfx.compute_ring[0].pipe;
                break;
        case AMDGPU_RING_TYPE_SDMA:
                ring->funcs = adev->sdma.instance[0].ring.funcs;
--
2.39.2