[PATCH v10 4/4] drm/amdgpu: add support of debugfs for mqd information

[Sunil Khatri]

Add debugfs support for mqd for each queue of the client.

The address exposed to debugfs could be used to dump
the mqd.

Signed-off-by: Sunil Khatri <sunil.kha...@amd.com>
Reviewed-by: Christian König <christian.koe...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c | 52 +++++++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_userq.h |  1 +
 2 files changed, 53 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c
index 295e7186e156..115d53bc9a8d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c
@@ -318,6 +318,9 @@ amdgpu_userq_destroy(struct drm_file *filp, int queue_id)
                amdgpu_bo_unreserve(queue->db_obj.obj);
        }
        amdgpu_bo_unref(&queue->db_obj.obj);
+
+       debugfs_remove_recursive(queue->debugfs_queue);
+
        r = amdgpu_userq_unmap_helper(uq_mgr, queue);
        amdgpu_userq_cleanup(uq_mgr, queue, queue_id);
        mutex_unlock(&uq_mgr->userq_mutex);
@@ -343,6 +346,46 @@ static int amdgpu_userq_priority_permit(struct drm_file 
*filp,
        return -EACCES;
 }
 
+#if defined(CONFIG_DEBUG_FS)
+static int amdgpu_mqd_info_read(struct seq_file *m, void *unused)
+{
+       struct amdgpu_usermode_queue *queue = m->private;
+       struct amdgpu_bo *bo;
+       int r;
+
+       if (!queue || !queue->mqd.obj)
+               return -EINVAL;
+
+       bo = amdgpu_bo_ref(queue->mqd.obj);
+       r = amdgpu_bo_reserve(bo, true);
+       if (r) {
+               amdgpu_bo_unref(&bo);
+               return -EINVAL;
+       }
+
+       seq_printf(m, "queue_type %d\n", queue->queue_type);
+       seq_printf(m, "mqd_gpu_address: 0x%llx\n", 
amdgpu_bo_gpu_offset(queue->mqd.obj));
+
+       amdgpu_bo_unreserve(bo);
+       amdgpu_bo_unref(&bo);
+
+       return 0;
+}
+
+static int amdgpu_mqd_info_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, amdgpu_mqd_info_read, inode->i_private);
+}
+
+static const struct file_operations amdgpu_mqd_info_fops = {
+       .owner = THIS_MODULE,
+       .open = amdgpu_mqd_info_open,
+       .read = seq_read,
+       .llseek = seq_lseek,
+       .release = single_release,
+};
+#endif
+
 static int
 amdgpu_userq_create(struct drm_file *filp, union drm_amdgpu_userq *args)
 {
@@ -352,6 +395,7 @@ amdgpu_userq_create(struct drm_file *filp, union 
drm_amdgpu_userq *args)
        const struct amdgpu_userq_funcs *uq_funcs;
        struct amdgpu_usermode_queue *queue;
        struct amdgpu_db_info db_info;
+       char *queue_name;
        bool skip_map_queue;
        uint64_t index;
        int qid, r = 0;
@@ -475,6 +519,14 @@ amdgpu_userq_create(struct drm_file *filp, union 
drm_amdgpu_userq *args)
                }
        }
 
+       queue_name = kasprintf(GFP_KERNEL, "queue-%d", qid);
+       if (!queue_name)
+               return -ENOMEM;
+
+       /* Queue dentry per client to hold MQD information   */
+       queue->debugfs_queue = debugfs_create_dir(queue_name, 
filp->debugfs_client);
+       debugfs_create_file("mqd_info", 0444, queue->debugfs_queue, queue, 
&amdgpu_mqd_info_fops);
+       kfree(queue_name);
 
        args->out.queue_id = qid;
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_userq.h 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_userq.h
index ec040c2fd6c9..b1ca91b7cda4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_userq.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_userq.h
@@ -65,6 +65,7 @@ struct amdgpu_usermode_queue {
        struct dma_fence        *last_fence;
        u32                     xcp_id;
        int                     priority;
+       struct dentry           *debugfs_queue;
 };
 
 struct amdgpu_userq_funcs {
-- 
2.34.1