scsi: hisi_sas: Add debugfs file structure for port

Create a file structure which was used to save the memory address and phy
pointer for port at debugfs. This structure is bound to the corresponding
debugfs file, it can help callback function of debugfs file to get what it
need.

Link: https://lore.kernel.org/r/1571926105-74636-10-git-send-email-john.garry@huawei.comSigned-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>

drivers/scsi/hisi_sas/hisi_sas.h

@@ -338,6 +338,11 @@ struct hisi_sas_debugfs_regs {
 	u32 *data;
 };
 
+struct hisi_sas_debugfs_port {
+	struct hisi_sas_phy *phy;
+	u32 *data;
+};
+
 struct hisi_hba {
 	/* This must be the first element, used by SHOST_TO_SAS_HA */
 	struct sas_ha_struct *p;
@@ -420,7 +425,7 @@ struct hisi_hba {
 	/* debugfs memories */
 	/* Put Global AXI and RAS Register into register array */
 	struct hisi_sas_debugfs_regs debugfs_regs[DEBUGFS_REGS_NUM];
-	u32 *debugfs_port_reg[HISI_SAS_MAX_PHYS];
+	struct hisi_sas_debugfs_port debugfs_port_reg[HISI_SAS_MAX_PHYS];
 	struct hisi_sas_debugfs_cq debugfs_cq[HISI_SAS_MAX_QUEUES];
 	struct hisi_sas_debugfs_dq debugfs_dq[HISI_SAS_MAX_QUEUES];
 	struct hisi_sas_iost *debugfs_iost;

drivers/scsi/hisi_sas/hisi_sas_main.c

@@ -2732,7 +2732,7 @@ static void hisi_sas_debugfs_snapshot_port_reg(struct hisi_hba *hisi_hba)
 	u32 *databuf;
 
 	for (phy_cnt = 0; phy_cnt < hisi_hba->n_phy; phy_cnt++) {
-		databuf = (u32 *)hisi_hba->debugfs_port_reg[phy_cnt];
+		databuf = hisi_hba->debugfs_port_reg[phy_cnt].data;
 		for (i = 0; i < port->count; i++, databuf++) {
 			offset = port->base_off + 4 * i;
 			*databuf = port->read_port_reg(hisi_hba, phy_cnt,
@@ -2933,13 +2933,13 @@ static const struct file_operations hisi_sas_debugfs_ras_fops = {
 
 static int hisi_sas_debugfs_port_show(struct seq_file *s, void *p)
 {
-	struct hisi_sas_phy *phy = s->private;
+	struct hisi_sas_debugfs_port *port = s->private;
+	struct hisi_sas_phy *phy = port->phy;
 	struct hisi_hba *hisi_hba = phy->hisi_hba;
 	const struct hisi_sas_hw *hw = hisi_hba->hw;
 	const struct hisi_sas_debugfs_reg *reg_port = hw->debugfs_reg_port;
-	u32 *databuf = hisi_hba->debugfs_port_reg[phy->sas_phy.id];
 
-	hisi_sas_debugfs_print_reg(databuf, reg_port, s);
+	hisi_sas_debugfs_print_reg(port->data, reg_port, s);
 
 	return 0;
 }
@@ -3221,7 +3221,8 @@ static void hisi_sas_debugfs_create_files(struct hisi_hba *hisi_hba)
 	for (p = 0; p < hisi_hba->n_phy; p++) {
 		snprintf(name, 256, "%d", p);
 
-		debugfs_create_file(name, 0400, dentry, &hisi_hba->phy[p],
+		debugfs_create_file(name, 0400, dentry,
+				    &hisi_hba->debugfs_port_reg[p],
 				    &hisi_sas_debugfs_port_fops);
 	}
 
@@ -3727,7 +3728,7 @@ static void hisi_sas_debugfs_release(struct hisi_hba *hisi_hba)
 		devm_kfree(dev, hisi_hba->debugfs_regs[i].data);
 
 	for (i = 0; i < hisi_hba->n_phy; i++)
-		devm_kfree(dev, hisi_hba->debugfs_port_reg[i]);
+		devm_kfree(dev, hisi_hba->debugfs_port_reg[i].data);
 }
 
 static int hisi_sas_debugfs_alloc(struct hisi_hba *hisi_hba)
@@ -3750,11 +3751,13 @@ static int hisi_sas_debugfs_alloc(struct hisi_hba *hisi_hba)
 
 	sz = hw->debugfs_reg_port->count * 4;
 	for (p = 0; p < hisi_hba->n_phy; p++) {
-		hisi_hba->debugfs_port_reg[p] =
-			devm_kmalloc(dev, sz, GFP_KERNEL);
+		struct hisi_sas_debugfs_port *port =
+				&hisi_hba->debugfs_port_reg[p];
 
-		if (!hisi_hba->debugfs_port_reg[p])
+		port->data = devm_kmalloc(dev, sz, GFP_KERNEL);
+		if (!port->data)
 			goto fail;
+		port->phy = &hisi_hba->phy[p];
 	}
 
 	sz = hw->complete_hdr_size * HISI_SAS_QUEUE_SLOTS;