[PATCH v3 2/3] drm/amdgpu/mes_userqueue: add MODIFY support for SDMA user queues

Add the SDMA case to the mqd_update dispatcher so an SDMA user queue can
be updated at runtime; until now it was rejected with -EINVAL.

mes_userq_sdma_mqd_update() reads a drm_amdgpu_userq_mqd_sdma_gfx11 from
user space, refreshes the queue props (csa address, queue size and ring
base) and re-inits the MQD, mirroring the compute path. This aligns KGD
user queues with KFD, which already supports updating SDMA queues via
update_mqd_sdma.

Signed-off-by: Jesse Zhang <[email protected]>
---
 drivers/gpu/drm/amd/amdgpu/mes_userqueue.c | 32 ++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/mes_userqueue.c b/drivers/gpu/drm/amd/amdgpu/mes_userqueue.c
index 82bb4369451e..4f6d92031838 100644
--- a/drivers/gpu/drm/amd/amdgpu/mes_userqueue.c
+++ b/drivers/gpu/drm/amd/amdgpu/mes_userqueue.c
@@ -681,6 +681,36 @@ static int mes_userq_mqd_create(struct amdgpu_usermode_queue *queue,
 	return r;
 }
 
+static int mes_userq_sdma_mqd_update(struct amdgpu_usermode_queue *queue,
+				     struct drm_amdgpu_userq_in *args_in)
+{
+	int retval = 0;
+	struct amdgpu_device *adev = queue->userq_mgr->adev;
+	struct amdgpu_mqd_prop *userq_props = queue->userq_prop;
+	struct amdgpu_mqd *mqd_hw_default = &adev->mqds[queue->queue_type];
+	struct drm_amdgpu_userq_mqd_sdma_gfx11 *sdma_mqd_v11;
+
+	if (args_in->mqd_size != sizeof(*sdma_mqd_v11)) {
+		DRM_ERROR("Invalid SDMA IP MQD size\n");
+		return -EINVAL;
+	}
+
+	sdma_mqd_v11 = memdup_user(u64_to_user_ptr(args_in->mqd), args_in->mqd_size);
+	if (IS_ERR(sdma_mqd_v11)) {
+		DRM_ERROR("Failed to read user MQD\n");
+		return -ENOMEM;
+	}
+
+	userq_props->csa_addr = sdma_mqd_v11->csa_va;
+	userq_props->queue_size = args_in->queue_size;
+	userq_props->hqd_base_gpu_addr = args_in->queue_va;
+
+	retval = mqd_hw_default->init_mqd(adev, (void *)queue->mqd.cpu_ptr, userq_props);
+
+	kfree(sdma_mqd_v11);
+	return retval;
+}
+
 static int mes_userq_compute_mqd_update(struct amdgpu_usermode_queue *queue,
 					struct drm_amdgpu_userq_in *args_in)
 {
@@ -723,6 +753,8 @@ static int mes_userq_mqd_update(struct amdgpu_usermode_queue *queue, struct drm_
 	switch (queue->queue_type) {
 	case AMDGPU_HW_IP_COMPUTE:
 		return mes_userq_compute_mqd_update(queue, args_in);
+	case AMDGPU_HW_IP_DMA:
+		return mes_userq_sdma_mqd_update(queue, args_in);
 	default:
 		return -EINVAL;
 	}
-- 
2.49.0