scsi: hisi_sas: Add debugfs file structure for IOST

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

Link: https://lore.kernel.org/r/1571926105-74636-11-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

@@ -343,6 +343,10 @@ struct hisi_sas_debugfs_port {
 	u32 *data;
 };
 
+struct hisi_sas_debugfs_iost {
+	struct hisi_sas_iost *iost;
+};
+
 struct hisi_hba {
 	/* This must be the first element, used by SHOST_TO_SAS_HA */
 	struct sas_ha_struct *p;
@@ -428,7 +432,7 @@ struct hisi_hba {
 	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;
+	struct hisi_sas_debugfs_iost debugfs_iost;
 	struct hisi_sas_itct *debugfs_itct;
 	u64 *debugfs_iost_cache;
 	u64 debugfs_timestamp;

drivers/scsi/hisi_sas/hisi_sas_main.c

@@ -2801,7 +2801,7 @@ static void hisi_sas_debugfs_snapshot_iost_reg(struct hisi_hba *hisi_hba)
 {
 	int max_command_entries = HISI_SAS_MAX_COMMANDS;
 	void *cachebuf = hisi_hba->debugfs_iost_cache;
-	void *databuf = hisi_hba->debugfs_iost;
+	void *databuf = hisi_hba->debugfs_iost.iost;
 	struct hisi_sas_iost *iost;
 	int i;
 
@@ -3060,14 +3060,14 @@ static const struct file_operations hisi_sas_debugfs_dq_fops = {
 
 static int hisi_sas_debugfs_iost_show(struct seq_file *s, void *p)
 {
-	struct hisi_hba *hisi_hba = s->private;
-	struct hisi_sas_iost *debugfs_iost = hisi_hba->debugfs_iost;
+	struct hisi_sas_debugfs_iost *debugfs_iost = s->private;
+	struct hisi_sas_iost *iost = debugfs_iost->iost;
 	int i, max_command_entries = HISI_SAS_MAX_COMMANDS;
 
-	for (i = 0; i < max_command_entries; i++, debugfs_iost++) {
-		__le64 *iost = &debugfs_iost->qw0;
+	for (i = 0; i < max_command_entries; i++, iost++) {
+		__le64 *data = &iost->qw0;
 
-		hisi_sas_show_row_64(s, i, sizeof(*debugfs_iost), iost);
+		hisi_sas_show_row_64(s, i, sizeof(*iost), data);
 	}
 
 	return 0;
@@ -3246,7 +3246,8 @@ static void hisi_sas_debugfs_create_files(struct hisi_hba *hisi_hba)
 				    &hisi_sas_debugfs_dq_fops);
 	}
 
-	debugfs_create_file("iost", 0400, dump_dentry, hisi_hba,
+	debugfs_create_file("iost", 0400, dump_dentry,
+			    &hisi_hba->debugfs_iost,
 			    &hisi_sas_debugfs_iost_fops);
 
 	debugfs_create_file("iost_cache", 0400, dump_dentry, hisi_hba,
@@ -3716,7 +3717,7 @@ static void hisi_sas_debugfs_release(struct hisi_hba *hisi_hba)
 
 	devm_kfree(dev, hisi_hba->debugfs_iost_cache);
 	devm_kfree(dev, hisi_hba->debugfs_itct_cache);
-	devm_kfree(dev, hisi_hba->debugfs_iost);
+	devm_kfree(dev, hisi_hba->debugfs_iost.iost);
 
 	for (i = 0; i < hisi_hba->queue_count; i++)
 		devm_kfree(dev, hisi_hba->debugfs_dq[i].hdr);
@@ -3784,8 +3785,8 @@ static int hisi_sas_debugfs_alloc(struct hisi_hba *hisi_hba)
 
 	sz = HISI_SAS_MAX_COMMANDS * sizeof(struct hisi_sas_iost);
 
-	hisi_hba->debugfs_iost = devm_kmalloc(dev, sz, GFP_KERNEL);
-	if (!hisi_hba->debugfs_iost)
+	hisi_hba->debugfs_iost.iost = devm_kmalloc(dev, sz, GFP_KERNEL);
+	if (!hisi_hba->debugfs_iost.iost)
 		goto fail;
 
 	sz = HISI_SAS_IOST_ITCT_CACHE_NUM *