scsi: hisi_sas: Debugfs global register create file and add file operations

This patch create debugfs file for global register and add file
operations.

Signed-off-by: Luo Jiaxing <luojiaxing@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 742f71a8412a..fd85934d241f 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -2544,6 +2544,66 @@ static void hisi_sas_debugfs_snapshot_iost_reg(struct hisi_hba *hisi_hba)
 	}
 }
 
+const char *
+hisi_sas_debugfs_to_reg_name(int off, int base_off,
+			     const struct hisi_sas_debugfs_reg_lu *lu)
+{
+	for (; lu->name; lu++) {
+		if (off == lu->off - base_off)
+			return lu->name;
+	}
+
+	return NULL;
+}
+
+static void hisi_sas_debugfs_print_reg(u32 *regs_val, const void *ptr,
+				       struct seq_file *s)
+{
+	const struct hisi_sas_debugfs_reg *reg = ptr;
+	int i;
+
+	for (i = 0; i < reg->count; i++) {
+		int off = i * 4;
+		const char *name;
+
+		name = hisi_sas_debugfs_to_reg_name(off, reg->base_off,
+						    reg->lu);
+
+		if (name)
+			seq_printf(s, "0x%08x 0x%08x %s\n", off,
+				   le32_to_cpu(regs_val[i]), name);
+		else
+			seq_printf(s, "0x%08x 0x%08x\n", off,
+				   le32_to_cpu(regs_val[i]));
+	}
+}
+
+static int hisi_sas_debugfs_global_show(struct seq_file *s, void *p)
+{
+	struct hisi_hba *hisi_hba = s->private;
+	const struct hisi_sas_hw *hw = hisi_hba->hw;
+	const struct hisi_sas_debugfs_reg *reg_global = hw->debugfs_reg_global;
+
+	hisi_sas_debugfs_print_reg((u32 *)hisi_hba->debugfs_global_reg,
+				   reg_global, s);
+
+	return 0;
+}
+
+static int hisi_sas_debugfs_global_open(struct inode *inode, struct file *filp)
+{
+	return single_open(filp, hisi_sas_debugfs_global_show,
+			   inode->i_private);
+}
+
+static const struct file_operations hisi_sas_debugfs_global_fops = {
+	.open = hisi_sas_debugfs_global_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+	.owner = THIS_MODULE,
+};
+
 static void hisi_sas_debugfs_create_files(struct hisi_hba *hisi_hba)
 {
 	struct dentry *dump_dentry;
@@ -2554,6 +2614,10 @@ static void hisi_sas_debugfs_create_files(struct hisi_hba *hisi_hba)
 		goto fail;
 
 	hisi_hba->debugfs_dump_dentry = dump_dentry;
+
+	if (!debugfs_create_file("global", 0400, dump_dentry, hisi_hba,
+				 &hisi_sas_debugfs_global_fops))
+		goto fail;
 	return;
 fail:
 	debugfs_remove_recursive(hisi_hba->debugfs_dir);