From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- drivers/s390/cio/blacklist.c | 351 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 351 insertions(+) create mode 100644 drivers/s390/cio/blacklist.c (limited to 'drivers/s390/cio/blacklist.c') diff --git a/drivers/s390/cio/blacklist.c b/drivers/s390/cio/blacklist.c new file mode 100644 index 000000000000..4a06c7d0e5e4 --- /dev/null +++ b/drivers/s390/cio/blacklist.c @@ -0,0 +1,351 @@ +/* + * drivers/s390/cio/blacklist.c + * S/390 common I/O routines -- blacklisting of specific devices + * $Revision: 1.33 $ + * + * Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH, + * IBM Corporation + * Author(s): Ingo Adlung (adlung@de.ibm.com) + * Cornelia Huck (cohuck@de.ibm.com) + * Arnd Bergmann (arndb@de.ibm.com) + */ + +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include "blacklist.h" +#include "cio.h" +#include "cio_debug.h" +#include "css.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 to indicate if a devno is blacklisted or not */ +#define __BL_DEV_WORDS (__MAX_SUBCHANNELS + (8*sizeof(long) - 1) / \ + (8*sizeof(long))) +static unsigned long bl_dev[__BL_DEV_WORDS]; +typedef enum {add, free} range_action; + +/* + * Function: blacklist_range + * (Un-)blacklist the devices from-to + */ +static inline void +blacklist_range (range_action action, unsigned int from, unsigned int to) +{ + if (!to) + to = from; + + if (from > to || to > __MAX_SUBCHANNELS) { + printk (KERN_WARNING "Invalid blacklist range " + "0x%04x to 0x%04x, skipping\n", from, to); + return; + } + for (; from <= to; from++) { + if (action == add) + set_bit (from, bl_dev); + else + clear_bit (from, bl_dev); + } +} + +/* + * Function: blacklist_busid + * Get devno/busid from given string. + * Shamelessly grabbed from dasd_devmap.c. + */ +static inline int +blacklist_busid(char **str, int *id0, int *id1, int *devno) +{ + int val, old_style; + char *sav; + + sav = *str; + + /* check for leading '0x' */ + old_style = 0; + if ((*str)[0] == '0' && (*str)[1] == 'x') { + *str += 2; + old_style = 1; + } + if (!isxdigit((*str)[0])) /* We require at least one hex digit */ + goto confused; + val = simple_strtoul(*str, str, 16); + if (old_style || (*str)[0] != '.') { + *id0 = *id1 = 0; + if (val < 0 || val > 0xffff) + goto confused; + *devno = val; + if ((*str)[0] != ',' && (*str)[0] != '-' && + (*str)[0] != '\n' && (*str)[0] != '\0') + goto confused; + return 0; + } + /* New style x.y.z busid */ + if (val < 0 || val > 0xff) + goto confused; + *id0 = val; + (*str)++; + if (!isxdigit((*str)[0])) /* We require at least one hex digit */ + goto confused; + val = simple_strtoul(*str, str, 16); + if (val < 0 || val > 0xff || (*str)++[0] != '.') + goto confused; + *id1 = val; + if (!isxdigit((*str)[0])) /* We require at least one hex digit */ + goto confused; + val = simple_strtoul(*str, str, 16); + if (val < 0 || val > 0xffff) + goto confused; + *devno = val; + if ((*str)[0] != ',' && (*str)[0] != '-' && + (*str)[0] != '\n' && (*str)[0] != '\0') + goto confused; + return 0; +confused: + strsep(str, ",\n"); + printk(KERN_WARNING "Invalid cio_ignore parameter '%s'\n", sav); + return 1; +} + +static inline int +blacklist_parse_parameters (char *str, range_action action) +{ + unsigned int from, to, from_id0, to_id0, from_id1, to_id1; + + while (*str != 0 && *str != '\n') { + range_action ra = action; + while(*str == ',') + str++; + if (*str == '!') { + ra = !action; + ++str; + } + + /* + * Since we have to parse the proc commands and the + * kernel arguments we have to check four cases + */ + if (strncmp(str,"all,",4) == 0 || strcmp(str,"all") == 0 || + strncmp(str,"all\n",4) == 0 || strncmp(str,"all ",4) == 0) { + from = 0; + to = __MAX_SUBCHANNELS; + str += 3; + } else { + int rc; + + rc = blacklist_busid(&str, &from_id0, + &from_id1, &from); + if (rc) + continue; + to = from; + to_id0 = from_id0; + to_id1 = from_id1; + if (*str == '-') { + str++; + rc = blacklist_busid(&str, &to_id0, + &to_id1, &to); + if (rc) + continue; + } + if (*str == '-') { + printk(KERN_WARNING "invalid cio_ignore " + "parameter '%s'\n", + strsep(&str, ",\n")); + continue; + } + if ((from_id0 != to_id0) || (from_id1 != to_id1)) { + printk(KERN_WARNING "invalid cio_ignore range " + "%x.%x.%04x-%x.%x.%04x\n", + from_id0, from_id1, from, + to_id0, to_id1, to); + continue; + } + } + /* FIXME: ignoring id0 and id1 here. */ + pr_debug("blacklist_setup: adding range " + "from 0.0.%04x to 0.0.%04x\n", from, to); + blacklist_range (ra, from, to); + } + return 1; +} + +/* Parsing the commandline for blacklist parameters, e.g. to blacklist + * bus ids 0.0.1234, 0.0.1235 and 0.0.1236, you could use any of: + * - cio_ignore=1234-1236 + * - cio_ignore=0x1234-0x1235,1236 + * - cio_ignore=0x1234,1235-1236 + * - cio_ignore=1236 cio_ignore=1234-0x1236 + * - cio_ignore=1234 cio_ignore=1236 cio_ignore=0x1235 + * - cio_ignore=0.0.1234-0.0.1236 + * - cio_ignore=0.0.1234,0x1235,1236 + * - ... + */ +static int __init +blacklist_setup (char *str) +{ + CIO_MSG_EVENT(6, "Reading blacklist parameters\n"); + return blacklist_parse_parameters (str, add); +} + +__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 devno) +{ + return test_bit (devno, bl_dev); +} + +#ifdef CONFIG_PROC_FS +/* + * Function: s390_redo_validation + * Look for no longer blacklisted devices + * FIXME: there must be a better way to do this */ +static inline void +s390_redo_validation (void) +{ + unsigned int irq; + + CIO_TRACE_EVENT (0, "redoval"); + for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) { + int ret; + struct subchannel *sch; + + sch = get_subchannel_by_schid(irq); + if (sch) { + /* Already known. */ + put_device(&sch->dev); + continue; + } + ret = css_probe_device(irq); + if (ret == -ENXIO) + break; /* We're through. */ + if (ret == -ENOMEM) + /* + * Stop validation for now. Bad, but no need for a + * panic. + */ + break; + } +} + +/* + * Function: blacklist_parse_proc_parameters + * parse the stuff which is piped to /proc/cio_ignore + */ +static inline void +blacklist_parse_proc_parameters (char *buf) +{ + if (strncmp (buf, "free ", 5) == 0) { + blacklist_parse_parameters (buf + 5, free); + } else if (strncmp (buf, "add ", 4) == 0) { + /* + * We don't need to check for known devices since + * css_probe_device will handle this correctly. + */ + blacklist_parse_parameters (buf + 4, add); + } else { + printk (KERN_WARNING "cio_ignore: Parse error; \n" + KERN_WARNING "try using 'free all|," + ",...'\n" + KERN_WARNING "or 'add ," + ",...'\n"); + return; + } + + s390_redo_validation (); +} + +/* FIXME: These should be real bus ids and not home-grown ones! */ +static int cio_ignore_read (char *page, char **start, off_t off, + int count, int *eof, void *data) +{ + const unsigned int entry_size = 18; /* "0.0.ABCD-0.0.EFGH\n" */ + long devno; + int len; + + len = 0; + for (devno = off; /* abuse the page variable + * as counter, see fs/proc/generic.c */ + devno <= __MAX_SUBCHANNELS && len + entry_size < count; devno++) { + if (!test_bit(devno, bl_dev)) + continue; + len += sprintf(page + len, "0.0.%04lx", devno); + if (test_bit(devno + 1, bl_dev)) { /* print range */ + while (++devno < __MAX_SUBCHANNELS) + if (!test_bit(devno, bl_dev)) + break; + len += sprintf(page + len, "-0.0.%04lx", --devno); + } + len += sprintf(page + len, "\n"); + } + + if (devno <= __MAX_SUBCHANNELS) + *eof = 1; + *start = (char *) (devno - off); /* number of checked entries */ + return len; +} + +static int cio_ignore_write(struct file *file, const char __user *user_buf, + unsigned long user_len, void *data) +{ + char *buf; + + if (user_len > 65536) + user_len = 65536; + buf = vmalloc (user_len + 1); /* maybe better use the stack? */ + if (buf == NULL) + return -ENOMEM; + if (strncpy_from_user (buf, user_buf, user_len) < 0) { + vfree (buf); + return -EFAULT; + } + buf[user_len] = '\0'; + + blacklist_parse_proc_parameters (buf); + + vfree (buf); + return user_len; +} + +static int +cio_ignore_proc_init (void) +{ + struct proc_dir_entry *entry; + + entry = create_proc_entry ("cio_ignore", S_IFREG | S_IRUGO | S_IWUSR, + &proc_root); + if (!entry) + return 0; + + entry->read_proc = cio_ignore_read; + entry->write_proc = cio_ignore_write; + + return 1; +} + +__initcall (cio_ignore_proc_init); + +#endif /* CONFIG_PROC_FS */ -- cgit v1.2.2