scsi: hisi_sas: Add debugfs file structure for DQ

Create a file structure which was used to save the memory address and DQ
pointer for DQ 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/1571926105-74636-8-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

@@ -328,6 +328,11 @@ struct hisi_sas_debugfs_cq {
 	void *complete_hdr;
 };
 
+struct hisi_sas_debugfs_dq {
+	struct hisi_sas_dq *dq;
+	struct hisi_sas_cmd_hdr *hdr;
+};
+
 struct hisi_hba {
 	/* This must be the first element, used by SHOST_TO_SAS_HA */
 	struct sas_ha_struct *p;
@@ -412,7 +417,7 @@ struct hisi_hba {
 	u32 *debugfs_regs[DEBUGFS_REGS_NUM];
 	u32 *debugfs_port_reg[HISI_SAS_MAX_PHYS];
 	struct hisi_sas_debugfs_cq debugfs_cq[HISI_SAS_MAX_QUEUES];
-	struct hisi_sas_cmd_hdr	*debugfs_cmd_hdr[HISI_SAS_MAX_QUEUES];
+	struct hisi_sas_debugfs_dq debugfs_dq[HISI_SAS_MAX_QUEUES];
 	struct hisi_sas_iost *debugfs_iost;
 	struct hisi_sas_itct *debugfs_itct;
 	u64 *debugfs_iost_cache;

drivers/scsi/hisi_sas/hisi_sas_main.c

@@ -2711,10 +2711,10 @@ static void hisi_sas_debugfs_snapshot_dq_reg(struct hisi_hba *hisi_hba)
 	int i;
 
 	for (i = 0; i < hisi_hba->queue_count; i++) {
-		struct hisi_sas_cmd_hdr	*debugfs_cmd_hdr, *cmd_hdr;
+		struct hisi_sas_cmd_hdr *debugfs_cmd_hdr, *cmd_hdr;
 		int j;
 
-		debugfs_cmd_hdr = hisi_hba->debugfs_cmd_hdr[i];
+		debugfs_cmd_hdr = hisi_hba->debugfs_dq[i].hdr;
 		cmd_hdr = hisi_hba->cmd_hdr[i];
 
 		for (j = 0; j < HISI_SAS_QUEUE_SLOTS; j++)
@@ -3024,9 +3024,8 @@ static const struct file_operations hisi_sas_debugfs_cq_fops = {
 
 static void hisi_sas_dq_show_slot(struct seq_file *s, int slot, void *dq_ptr)
 {
-	struct hisi_sas_dq *dq = dq_ptr;
-	struct hisi_hba *hisi_hba = dq->hisi_hba;
-	void *cmd_queue = hisi_hba->debugfs_cmd_hdr[dq->id];
+	struct hisi_sas_debugfs_dq *debugfs_dq = dq_ptr;
+	void *cmd_queue = debugfs_dq->hdr;
 	__le32 *cmd_hdr = cmd_queue +
 		sizeof(struct hisi_sas_cmd_hdr) * slot;
 
@@ -3237,7 +3236,8 @@ static void hisi_sas_debugfs_create_files(struct hisi_hba *hisi_hba)
 	for (d = 0; d < hisi_hba->queue_count; d++) {
 		snprintf(name, 256, "%d", d);
 
-		debugfs_create_file(name, 0400, dentry, &hisi_hba->dq[d],
+		debugfs_create_file(name, 0400, dentry,
+				    &hisi_hba->debugfs_dq[d],
 				    &hisi_sas_debugfs_dq_fops);
 	}
 
@@ -3712,7 +3712,7 @@ static void hisi_sas_debugfs_release(struct hisi_hba *hisi_hba)
 	devm_kfree(dev, hisi_hba->debugfs_iost);
 
 	for (i = 0; i < hisi_hba->queue_count; i++)
-		devm_kfree(dev, hisi_hba->debugfs_cmd_hdr[i]);
+		devm_kfree(dev, hisi_hba->debugfs_dq[i].hdr);
 
 	for (i = 0; i < hisi_hba->queue_count; i++)
 		devm_kfree(dev, hisi_hba->debugfs_cq[i].complete_hdr);
@@ -3774,11 +3774,13 @@ static int hisi_sas_debugfs_alloc(struct hisi_hba *hisi_hba)
 
 	sz = sizeof(struct hisi_sas_cmd_hdr) * HISI_SAS_QUEUE_SLOTS;
 	for (d = 0; d < hisi_hba->queue_count; d++) {
-		hisi_hba->debugfs_cmd_hdr[d] =
-			devm_kmalloc(dev, sz, GFP_KERNEL);
+		struct hisi_sas_debugfs_dq *dq =
+				&hisi_hba->debugfs_dq[d];
 
-		if (!hisi_hba->debugfs_cmd_hdr[d])
+		dq->hdr = devm_kmalloc(dev, sz, GFP_KERNEL);
+		if (!dq->hdr)
 			goto fail;
+		dq->dq = &hisi_hba->dq[d];
 	}
 
 	sz = HISI_SAS_MAX_COMMANDS * sizeof(struct hisi_sas_iost);