scsi: hisi_sas: Enable debugfs support by default

mainline inclusion
from mainline-master
commit 1dbe61bf
category: bugfix
bugzilla: 175270
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1dbe61bf7d760547d16ccf057572e641a653ad4a

------------------------------------------------------------------------

Add a config option to enable debugfs support by default. And if debugfs
support is enabled by default, dump count default value is increased to 50
as generally users want something bigger than the current default in that
situation.

Link: https://lore.kernel.org/r/1611659068-131975-4-git-send-email-john.garry@huawei.comSigned-off-by: NLuo Jiaxing <luojiaxing@huawei.com>
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: NOuyangdelong <ouyangdelong@huawei.com>
Signed-off-by: NNifujia <nifujia1@hisilicon.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/scsi/hisi_sas/Kconfig

@@ -18,3 +18,9 @@ config SCSI_HISI_SAS_PCI
 	depends on ACPI
 	help
 		This driver supports HiSilicon's SAS HBA based on PCI device
+
+config SCSI_HISI_SAS_DEBUGFS_DEFAULT_ENABLE
+	bool "HiSilicon SAS debugging default enable"
+	depends on SCSI_HISI_SAS
+	help
+		Set Y to default enable DEBUGFS for SCSI_HISI_SAS

drivers/scsi/hisi_sas/hisi_sas_main.c

@@ -2722,12 +2722,21 @@ int hisi_sas_remove(struct platform_device *pdev)
 }
 EXPORT_SYMBOL_GPL(hisi_sas_remove);
 
+#if IS_ENABLED(CONFIG_SCSI_HISI_SAS_DEBUGFS_DEFAULT_ENABLE)
+#define DEBUGFS_ENABLE_DEFAULT  "enabled"
+bool hisi_sas_debugfs_enable = true;
+u32 hisi_sas_debugfs_dump_count = 50;
+#else
+#define DEBUGFS_ENABLE_DEFAULT "disabled"
 bool hisi_sas_debugfs_enable;
+u32 hisi_sas_debugfs_dump_count = 1;
+#endif
+
 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)");
+MODULE_PARM_DESC(hisi_sas_debugfs_enable,
+		 "Enable driver debugfs (default "DEBUGFS_ENABLE_DEFAULT")");
 
-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");