drm/amdgpu/sdma4.4.2: add support for disabling kernel queues

Allow the user to disable kernel queues.  This can be used
to free up vmid resources if kernel queues are not needed.

Set amdgpu.user_queue=2 to disable kernel queues.

Reviewed-by: Kent Russell <kent.russell@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c b/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c
index 88428b88e00fc08be372cc55ac99fdc6de5c5157..777a708528833c7074f783a042bd22f6b5bd77cd 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c
@@ -1359,6 +1359,19 @@ static int sdma_v4_4_2_early_init(struct amdgpu_ip_block *ip_block)
        struct amdgpu_device *adev = ip_block->adev;
        int r;
 
+       switch (amdgpu_user_queue) {
+       case -1:
+       case 0:
+       default:
+               adev->sdma.no_user_submission = false;
+               adev->sdma.disable_uq = true;
+               break;
+       case 2:
+               adev->sdma.no_user_submission = true;
+               adev->sdma.disable_uq = true;
+               break;
+       }
+
        r = sdma_v4_4_2_init_microcode(adev);
        if (r)
                return r;
@@ -1478,6 +1491,7 @@ static int sdma_v4_4_2_sw_init(struct amdgpu_ip_block *ip_block)
                /* doorbell size is 2 dwords, get DWORD offset */
                ring->doorbell_index = adev->doorbell_index.sdma_engine[i] << 1;
                ring->vm_hub = AMDGPU_MMHUB0(aid_id);
+               ring->no_user_submission = adev->sdma.no_user_submission;
 
                sprintf(ring->name, "sdma%d.%d", aid_id,
                                i % adev->sdma.num_inst_per_aid);