[PATCHv4 2/5] scsi: Export blacklist flags to sysfs

[Hannes Reinecke <hare@suse.de>]

Each scsi device is scanned according to the found blacklist flags,
but this information is never presented to sysfs.
This makes it quite hard to figure out if blacklisting worked as
expected.
With this patch we're exporting an additional attribute 'blacklist'
containing the blacklist flags for this device.

Signed-off-by: Hannes Reinecke <hare@suse.com>
---
 drivers/scsi/Makefile     |  8 +++++++
 drivers/scsi/mktbl.pl     | 26 ++++++++++++++++++++
 drivers/scsi/scsi_scan.c  |  1 +
 drivers/scsi/scsi_sysfs.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 95 insertions(+)
 create mode 100644 drivers/scsi/mktbl.pl

diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index 93dbe58..b25d094 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -191,6 +191,14 @@ clean-files :=	53c700_d.h 53c700_u.h
 
 $(obj)/53c700.o $(MODVERDIR)/$(obj)/53c700.ver: $(obj)/53c700_d.h
 
+$(obj)/scsi_sysfs.o: $(obj)/scsi_devinfo_tbl.c
+
+quiet_cmd_bflags = GEN     $@
+	cmd_bflags = $(PERL) -s $(src)/mktbl.pl BLIST $< > $@
+
+$(obj)/scsi_devinfo_tbl.c: include/scsi/scsi_devinfo.h
+	$(call if_changed,bflags)
+
 # If you want to play with the firmware, uncomment
 # GENERATE_FIRMWARE := 1
 
diff --git a/drivers/scsi/mktbl.pl b/drivers/scsi/mktbl.pl
new file mode 100644
index 0000000..0dc5cdb
--- /dev/null
+++ b/drivers/scsi/mktbl.pl
@@ -0,0 +1,26 @@
+#!/usr/bin/perl
+#
+# Build a mapping table for C definitions.
+#
+# Copyright (c) 2017 Hannes Reinecke, SUSE Linux GmbH.
+# All rights reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public Licence
+# as published by the Free Software Foundation; either version
+# 2 of the Licence, or (at your option) any later version.
+#
+
+my $prf;
+
+$prf = $ARGV[0];
+open IN_FILE, "<$ARGV[1]" || die;
+print "\t/*\n\t * Automatically generated by ", $0, ".\n";
+print "\t * Do not edit.\n\t */\n";
+while (<IN_FILE>) {
+    chomp;
+    if (/^#define ${prf}_([^[:blank:]]*).*/) {
+	print "\t{ ", $prf, "_", $1, ", \"", $1, "\" },\n";
+    }
+}
+close IN_FILE || die;
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index fd88dab..075918b 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -984,6 +984,7 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
 		scsi_attach_vpd(sdev);
 
 	sdev->max_queue_depth = sdev->queue_depth;
+	sdev->sdev_bflags = *bflags;
 
 	/*
 	 * Ok, the device is now all set up, we can
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index e9b78db..dbda738 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -20,6 +20,7 @@
 #include <scsi/scsi_dh.h>
 #include <scsi/scsi_transport.h>
 #include <scsi/scsi_driver.h>
+#include <scsi/scsi_devinfo.h>
 
 #include "scsi_priv.h"
 #include "scsi_logging.h"
@@ -110,6 +111,27 @@ static const char *scsi_access_state_name(unsigned char state)
 }
 #endif
 
+static const struct {
+	unsigned int	value;
+	char		*name;
+} sdev_bflags[] = {
+#include "scsi_devinfo_tbl.c"
+};
+
+static const char *sdev_bflags_name(unsigned int bflags)
+{
+	int i;
+	const char *name = NULL;
+
+	for (i = 0; i < ARRAY_SIZE(sdev_bflags); i++) {
+		if (sdev_bflags[i].value == bflags) {
+			name = sdev_bflags[i].name;
+			break;
+		}
+	}
+	return name;
+}
+
 static int check_set(unsigned long long *val, char *src)
 {
 	char *last;
@@ -955,6 +977,43 @@ static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 }
 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
 
+static ssize_t
+sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
+		    char *buf)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	int i;
+	char *ptr = buf;
+	ssize_t len = 0;
+
+	for (i = 0; i < sizeof(unsigned int) * 8; i++) {
+		unsigned int bflags = (unsigned int)1 << i;
+		ssize_t blen;
+		const char *name = NULL;
+
+		if (!(bflags & sdev->sdev_bflags))
+			continue;
+
+		if (ptr != buf) {
+			blen = snprintf(ptr, 2, " ");
+			ptr += blen;
+			len += blen;
+		}
+		name = sdev_bflags_name(bflags);
+		if (name)
+			blen = snprintf(ptr, strlen(name) + 1,
+					"%s", name);
+		else
+			blen = snprintf(ptr, 67, "INVALID_BIT(%d)", i);
+		ptr += blen;
+		len += blen;
+	}
+	if (len)
+		len += snprintf(ptr, 2, "\n");
+	return len;
+}
+static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
+
 #ifdef CONFIG_SCSI_DH
 static ssize_t
 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
@@ -1140,6 +1199,7 @@ static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
 	&dev_attr_queue_depth.attr,
 	&dev_attr_queue_type.attr,
 	&dev_attr_wwid.attr,
+	&dev_attr_blacklist.attr,
 #ifdef CONFIG_SCSI_DH
 	&dev_attr_dh_state.attr,
 	&dev_attr_access_state.attr,
-- 
1.8.5.6