linux-kernel - [PATCH v2 15/18] scsi: hisi_sas: Add module parameter for debugfs dump count

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Date:   Thu, 24 Oct 2019 22:08:22 +0800
From:   John Garry <john.garry@...wei.com>
To:     <jejb@...ux.vnet.ibm.com>, <martin.petersen@...cle.com>
CC:     <linux-scsi@...r.kernel.org>, <linuxarm@...wei.com>,
        <linux-kernel@...r.kernel.org>,
        Luo Jiaxing <luojiaxing@...wei.com>,
        "John Garry" <john.garry@...wei.com>
Subject: [PATCH v2 15/18] scsi: hisi_sas: Add module parameter for debugfs dump count

From: Luo Jiaxing <luojiaxing@...wei.com>

We still only use dump index #0 however.

Signed-off-by: Luo Jiaxing <luojiaxing@...wei.com>
Signed-off-by: John Garry <john.garry@...wei.com>
---
 drivers/scsi/hisi_sas/hisi_sas.h      |  1 +
 drivers/scsi/hisi_sas/hisi_sas_main.c | 16 +++++++++++++---
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h
index b4c6bec4b92c..bdd4aa7ed730 100644
--- a/drivers/scsi/hisi_sas/hisi_sas.h
+++ b/drivers/scsi/hisi_sas/hisi_sas.h
@@ -598,6 +598,7 @@ struct hisi_sas_slot_dif_buf_table {
 extern struct scsi_transport_template *hisi_sas_stt;
 
 extern bool hisi_sas_debugfs_enable;
+extern u32 hisi_sas_debugfs_dump_count;
 extern struct dentry *hisi_sas_debugfs_dir;
 
 extern void hisi_sas_stop_phys(struct hisi_hba *hisi_hba);
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index b599595ea095..5b3cee67bb24 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -3819,7 +3819,7 @@ static int hisi_sas_debugfs_alloc(struct hisi_hba *hisi_hba, int dump_index)
 
 	return 0;
 fail:
-	for (i = 0; i < HISI_SAS_MAX_DEBUGFS_DUMP; i++)
+	for (i = 0; i < hisi_sas_debugfs_dump_count; i++)
 		hisi_sas_debugfs_release(hisi_hba, i);
 	return -ENOMEM;
 }
@@ -3870,7 +3870,7 @@ void hisi_sas_debugfs_init(struct hisi_hba *hisi_hba)
 	hisi_hba->debugfs_dump_dentry =
 			debugfs_create_dir("dump", hisi_hba->debugfs_dir);
 
-	for (i = 0; i < HISI_SAS_MAX_DEBUGFS_DUMP; i++) {
+	for (i = 0; i < hisi_sas_debugfs_dump_count; i++) {
 		if (hisi_sas_debugfs_alloc(hisi_hba, i)) {
 			debugfs_remove_recursive(hisi_hba->debugfs_dir);
 			dev_dbg(dev, "failed to init debugfs!\n");
@@ -3909,14 +3909,24 @@ EXPORT_SYMBOL_GPL(hisi_sas_debugfs_enable);
 module_param_named(debugfs_enable, hisi_sas_debugfs_enable, bool, 0444);
 MODULE_PARM_DESC(hisi_sas_debugfs_enable, "Enable driver debugfs (default disabled)");
 
+u32 hisi_sas_debugfs_dump_count = 1;
+EXPORT_SYMBOL_GPL(hisi_sas_debugfs_dump_count);
+module_param_named(debugfs_dump_count, hisi_sas_debugfs_dump_count, uint, 0444);
+MODULE_PARM_DESC(hisi_sas_debugfs_dump_count, "Number of debugfs dumps to allow");
+
 static __init int hisi_sas_init(void)
 {
 	hisi_sas_stt = sas_domain_attach_transport(&hisi_sas_transport_ops);
 	if (!hisi_sas_stt)
 		return -ENOMEM;
 
-	if (hisi_sas_debugfs_enable)
+	if (hisi_sas_debugfs_enable) {
 		hisi_sas_debugfs_dir = debugfs_create_dir("hisi_sas", NULL);
+		if (hisi_sas_debugfs_dump_count > HISI_SAS_MAX_DEBUGFS_DUMP) {
+			pr_info("hisi_sas: Limiting debugfs dump count\n");
+			hisi_sas_debugfs_dump_count = HISI_SAS_MAX_DEBUGFS_DUMP;
+		}
+	}
 
 	return 0;
 }
-- 
2.17.1