linux-kernel - [PATCH v9 4/4] drm/amdgpu: add support of debugfs for mqd information

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Message-Id: <20250701164948.8105-5-sunil.khatri@amd.com>
Date: Tue,  1 Jul 2025 22:19:48 +0530
From: Sunil Khatri <sunil.khatri@....com>
To: Christian König <christian.koenig@....com>,
        dri-devel@...ts.freedesktop.org
Cc: amd-gfx@...ts.freedesktop.org, simona@...ll.ch, tzimmermann@...e.de,
        tursulin@...ulin.net, phasta@...nel.org, dakr@...nel.org,
        linux-kernel@...r.kernel.org, Oded Gabbay <ogabbay@...nel.org>,
        Jeff Hugo <jeff.hugo@....qualcomm.com>,
        Sunil Khatri <sunil.khatri@....com>
Subject: [PATCH v9 4/4] drm/amdgpu: add support of debugfs for mqd information

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.khatri@....com>
Reviewed-by: Christian König <christian.koenig@....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