Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 429 insertions, 0 deletions

diff --git a/drivers/s390/cio/blacklist.c b/drivers/s390/cio/blacklist.c
new file mode 100644
index 000000000..93695d535
--- /dev/null
+++ b/drivers/s390/cio/blacklist.c
@@ -0,0 +1,429 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *   S/390 common I/O routines -- blacklisting of specific devices
+ *
+ *    Copyright IBM Corp. 1999, 2013
+ *    Author(s): Ingo Adlung (adlung@de.ibm.com)
+ *		 Cornelia Huck (cornelia.huck@de.ibm.com)
+ *		 Arnd Bergmann (arndb@de.ibm.com)
+ */
+
+#define KMSG_COMPONENT "cio"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/init.h>
+#include <linux/vmalloc.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/ctype.h>
+#include <linux/device.h>
+
+#include <linux/uaccess.h>
+#include <asm/cio.h>
+#include <asm/ipl.h>
+
+#include "blacklist.h"
+#include "cio.h"
+#include "cio_debug.h"
+#include "css.h"
+#include "device.h"
+
+/*
+ * "Blacklisting" of certain devices:
+ * Device numbers given in the commandline as cio_ignore=... won't be known
+ * to Linux.
+ *
+ * These can be single devices or ranges of devices
+ */
+
+/* 65536 bits for each set to indicate if a devno is blacklisted or not */
+#define __BL_DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
+			 (8*sizeof(long)))
+static unsigned long bl_dev[__MAX_SSID + 1][__BL_DEV_WORDS];
+typedef enum {add, free} range_action;
+
+/*
+ * Function: blacklist_range
+ * (Un-)blacklist the devices from-to
+ */
+static int blacklist_range(range_action action, unsigned int from_ssid,
+			   unsigned int to_ssid, unsigned int from,
+			   unsigned int to, int msgtrigger)
+{
+	if ((from_ssid > to_ssid) || ((from_ssid == to_ssid) && (from > to))) {
+		if (msgtrigger)
+			pr_warn("0.%x.%04x to 0.%x.%04x is not a valid range for cio_ignore\n",
+				from_ssid, from, to_ssid, to);
+
+		return 1;
+	}
+
+	while ((from_ssid < to_ssid) || ((from_ssid == to_ssid) &&
+	       (from <= to))) {
+		if (action == add)
+			set_bit(from, bl_dev[from_ssid]);
+		else
+			clear_bit(from, bl_dev[from_ssid]);
+		from++;
+		if (from > __MAX_SUBCHANNEL) {
+			from_ssid++;
+			from = 0;
+		}
+	}
+
+	return 0;
+}
+
+static int pure_hex(char **cp, unsigned int *val, int min_digit,
+		    int max_digit, int max_val)
+{
+	int diff;
+
+	diff = 0;
+	*val = 0;
+
+	while (diff <= max_digit) {
+		int value = hex_to_bin(**cp);
+
+		if (value < 0)
+			break;
+		*val = *val * 16 + value;
+		(*cp)++;
+		diff++;
+	}
+
+	if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
+		return 1;
+
+	return 0;
+}
+
+static int parse_busid(char *str, unsigned int *cssid, unsigned int *ssid,
+		       unsigned int *devno, int msgtrigger)
+{
+	char *str_work;
+	int val, rc, ret;
+
+	rc = 1;
+
+	if (*str == '\0')
+		goto out;
+
+	/* old style */
+	str_work = str;
+	val = simple_strtoul(str, &str_work, 16);
+
+	if (*str_work == '\0') {
+		if (val <= __MAX_SUBCHANNEL) {
+			*devno = val;
+			*ssid = 0;
+			*cssid = 0;
+			rc = 0;
+		}
+		goto out;
+	}
+
+	/* new style */
+	str_work = str;
+	ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
+	if (ret || (str_work[0] != '.'))
+		goto out;
+	str_work++;
+	ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
+	if (ret || (str_work[0] != '.'))
+		goto out;
+	str_work++;
+	ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
+	if (ret || (str_work[0] != '\0'))
+		goto out;
+
+	rc = 0;
+out:
+	if (rc && msgtrigger)
+		pr_warn("%s is not a valid device for the cio_ignore kernel parameter\n",
+			str);
+
+	return rc;
+}
+
+static int blacklist_parse_parameters(char *str, range_action action,
+				      int msgtrigger)
+{
+	unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
+	int rc, totalrc;
+	char *parm;
+	range_action ra;
+
+	totalrc = 0;
+
+	while ((parm = strsep(&str, ","))) {
+		rc = 0;
+		ra = action;
+		if (*parm == '!') {
+			if (ra == add)
+				ra = free;
+			else
+				ra = add;
+			parm++;
+		}
+		if (strcmp(parm, "all") == 0) {
+			from_cssid = 0;
+			from_ssid = 0;
+			from = 0;
+			to_cssid = __MAX_CSSID;
+			to_ssid = __MAX_SSID;
+			to = __MAX_SUBCHANNEL;
+		} else if (strcmp(parm, "ipldev") == 0) {
+			if (ipl_info.type == IPL_TYPE_CCW) {
+				from_cssid = 0;
+				from_ssid = ipl_info.data.ccw.dev_id.ssid;
+				from = ipl_info.data.ccw.dev_id.devno;
+			} else if (ipl_info.type == IPL_TYPE_FCP ||
+				   ipl_info.type == IPL_TYPE_FCP_DUMP) {
+				from_cssid = 0;
+				from_ssid = ipl_info.data.fcp.dev_id.ssid;
+				from = ipl_info.data.fcp.dev_id.devno;
+			} else {
+				continue;
+			}
+			to_cssid = from_cssid;
+			to_ssid = from_ssid;
+			to = from;
+		} else if (strcmp(parm, "condev") == 0) {
+			if (console_devno == -1)
+				continue;
+
+			from_cssid = to_cssid = 0;
+			from_ssid = to_ssid = 0;
+			from = to = console_devno;
+		} else {
+			rc = parse_busid(strsep(&parm, "-"), &from_cssid,
+					 &from_ssid, &from, msgtrigger);
+			if (!rc) {
+				if (parm != NULL)
+					rc = parse_busid(parm, &to_cssid,
+							 &to_ssid, &to,
+							 msgtrigger);
+				else {
+					to_cssid = from_cssid;
+					to_ssid = from_ssid;
+					to = from;
+				}
+			}
+		}
+		if (!rc) {
+			rc = blacklist_range(ra, from_ssid, to_ssid, from, to,
+					     msgtrigger);
+			if (rc)
+				totalrc = -EINVAL;
+		} else
+			totalrc = -EINVAL;
+	}
+
+	return totalrc;
+}
+
+static int __init
+blacklist_setup (char *str)
+{
+	CIO_MSG_EVENT(6, "Reading blacklist parameters\n");
+	if (blacklist_parse_parameters(str, add, 1))
+		return 0;
+	return 1;
+}
+
+__setup ("cio_ignore=", blacklist_setup);
+
+/* Checking if devices are blacklisted */
+
+/*
+ * Function: is_blacklisted
+ * Returns 1 if the given devicenumber can be found in the blacklist,
+ * otherwise 0.
+ * Used by validate_subchannel()
+ */
+int
+is_blacklisted (int ssid, int devno)
+{
+	return test_bit (devno, bl_dev[ssid]);
+}
+
+#ifdef CONFIG_PROC_FS
+/*
+ * Function: blacklist_parse_proc_parameters
+ * parse the stuff which is piped to /proc/cio_ignore
+ */
+static int blacklist_parse_proc_parameters(char *buf)
+{
+	int rc;
+	char *parm;
+
+	parm = strsep(&buf, " ");
+
+	if (strcmp("free", parm) == 0) {
+		rc = blacklist_parse_parameters(buf, free, 0);
+		/*
+		 * Evaluate the subchannels without an online device. This way,
+		 * no path-verification will be triggered on those subchannels
+		 * and it avoids unnecessary delays.
+		 */
+		css_schedule_eval_cond(CSS_EVAL_NOT_ONLINE, 0);
+	} else if (strcmp("add", parm) == 0)
+		rc = blacklist_parse_parameters(buf, add, 0);
+	else if (strcmp("purge", parm) == 0)
+		return ccw_purge_blacklisted();
+	else
+		return -EINVAL;
+
+
+	return rc;
+}
+
+/* Iterator struct for all devices. */
+struct ccwdev_iter {
+	int devno;
+	int ssid;
+	int in_range;
+};
+
+static void *
+cio_ignore_proc_seq_start(struct seq_file *s, loff_t *offset)
+{
+	struct ccwdev_iter *iter = s->private;
+
+	if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1))
+		return NULL;
+	memset(iter, 0, sizeof(*iter));
+	iter->ssid = *offset / (__MAX_SUBCHANNEL + 1);
+	iter->devno = *offset % (__MAX_SUBCHANNEL + 1);
+	return iter;
+}
+
+static void
+cio_ignore_proc_seq_stop(struct seq_file *s, void *it)
+{
+}
+
+static void *
+cio_ignore_proc_seq_next(struct seq_file *s, void *it, loff_t *offset)
+{
+	struct ccwdev_iter *iter;
+	loff_t p = *offset;
+
+	(*offset)++;
+	if (p >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1))
+		return NULL;
+	iter = it;
+	if (iter->devno == __MAX_SUBCHANNEL) {
+		iter->devno = 0;
+		iter->ssid++;
+		if (iter->ssid > __MAX_SSID)
+			return NULL;
+	} else
+		iter->devno++;
+	return iter;
+}
+
+static int
+cio_ignore_proc_seq_show(struct seq_file *s, void *it)
+{
+	struct ccwdev_iter *iter;
+
+	iter = it;
+	if (!is_blacklisted(iter->ssid, iter->devno))
+		/* Not blacklisted, nothing to output. */
+		return 0;
+	if (!iter->in_range) {
+		/* First device in range. */
+		if ((iter->devno == __MAX_SUBCHANNEL) ||
+		    !is_blacklisted(iter->ssid, iter->devno + 1)) {
+			/* Singular device. */
+			seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno);
+			return 0;
+		}
+		iter->in_range = 1;
+		seq_printf(s, "0.%x.%04x-", iter->ssid, iter->devno);
+		return 0;
+	}
+	if ((iter->devno == __MAX_SUBCHANNEL) ||
+	    !is_blacklisted(iter->ssid, iter->devno + 1)) {
+		/* Last device in range. */
+		iter->in_range = 0;
+		seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno);
+	}
+	return 0;
+}
+
+static ssize_t
+cio_ignore_write(struct file *file, const char __user *user_buf,
+		 size_t user_len, loff_t *offset)
+{
+	char *buf;
+	ssize_t rc, ret, i;
+
+	if (*offset)
+		return -EINVAL;
+	if (user_len > 65536)
+		user_len = 65536;
+	buf = vzalloc(user_len + 1); /* maybe better use the stack? */
+	if (buf == NULL)
+		return -ENOMEM;
+
+	if (strncpy_from_user (buf, user_buf, user_len) < 0) {
+		rc = -EFAULT;
+		goto out_free;
+	}
+
+	i = user_len - 1;
+	while ((i >= 0) && (isspace(buf[i]) || (buf[i] == 0))) {
+		buf[i] = '\0';
+		i--;
+	}
+	ret = blacklist_parse_proc_parameters(buf);
+	if (ret)
+		rc = ret;
+	else
+		rc = user_len;
+
+out_free:
+	vfree (buf);
+	return rc;
+}
+
+static const struct seq_operations cio_ignore_proc_seq_ops = {
+	.start = cio_ignore_proc_seq_start,
+	.stop  = cio_ignore_proc_seq_stop,
+	.next  = cio_ignore_proc_seq_next,
+	.show  = cio_ignore_proc_seq_show,
+};
+
+static int
+cio_ignore_proc_open(struct inode *inode, struct file *file)
+{
+	return seq_open_private(file, &cio_ignore_proc_seq_ops,
+				sizeof(struct ccwdev_iter));
+}
+
+static const struct proc_ops cio_ignore_proc_ops = {
+	.proc_open	= cio_ignore_proc_open,
+	.proc_read	= seq_read,
+	.proc_lseek	= seq_lseek,
+	.proc_release	= seq_release_private,
+	.proc_write	= cio_ignore_write,
+};
+
+static int
+cio_ignore_proc_init (void)
+{
+	struct proc_dir_entry *entry;
+
+	entry = proc_create("cio_ignore", S_IFREG | S_IRUGO | S_IWUSR, NULL,
+			    &cio_ignore_proc_ops);
+	if (!entry)
+		return -ENOENT;
+	return 0;
+}
+
+__initcall (cio_ignore_proc_init);
+
+#endif /* CONFIG_PROC_FS */