RDMA/hns: Add write support to debugfs

Add write support to debugfs.

Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
Link: https://patch.msgid.link/20260507012148.1079712-3-huangjunxian6@hisilicon.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

2 files changed, 21 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/hns/hns_roce_debugfs.c b/drivers/infiniband/hw/hns/hns_roce_debugfs.c
index db32c5897640..724d5ad90bfe 100644
--- a/drivers/infiniband/hw/hns/hns_roce_debugfs.c
+++ b/drivers/infiniband/hw/hns/hns_roce_debugfs.c
@@ -18,11 +18,31 @@ static int hns_debugfs_seqfile_open(struct inode *inode, struct file *f)
 	return single_open(f, seqfile->read, seqfile->data);
 }
 
+static ssize_t hns_debugfs_seqfile_write(struct file *file,
+					 const char __user *buffer,
+					 size_t count, loff_t *ppos)
+{
+	struct hns_debugfs_seqfile *seqfile = file_inode(file)->i_private;
+	char buf[16] = {};
+
+	if (!seqfile->write)
+		return -EOPNOTSUPP;
+
+	if (count >= sizeof(buf))
+		return -EINVAL;
+
+	if (copy_from_user(buf, buffer, count))
+		return -EFAULT;
+
+	return seqfile->write(buf, count, seqfile->data);
+}
+
 static const struct file_operations hns_debugfs_seqfile_fops = {
 	.owner = THIS_MODULE,
 	.open = hns_debugfs_seqfile_open,
 	.release = single_release,
 	.read = seq_read,
+	.write = hns_debugfs_seqfile_write,
 	.llseek = seq_lseek
 };
 
diff --git a/drivers/infiniband/hw/hns/hns_roce_debugfs.h b/drivers/infiniband/hw/hns/hns_roce_debugfs.h
index 98e87bd3161e..4e77dea0fbf6 100644
--- a/drivers/infiniband/hw/hns/hns_roce_debugfs.h
+++ b/drivers/infiniband/hw/hns/hns_roce_debugfs.h
@@ -9,6 +9,7 @@
 /* debugfs seqfile */
 struct hns_debugfs_seqfile {
 	int (*read)(struct seq_file *seq, void *data);
+	ssize_t (*write)(char *buf, size_t count, void *data);
 	void *data;
 };