[mirror_spl.git] / modules / spl / spl-proc.c

#include <sys/proc.h>

#ifdef DEBUG_SUBSYSTEM
#undef DEBUG_SUBSYSTEM
#endif

#define DEBUG_SUBSYSTEM S_PROC

#ifdef DEBUG_KMEM
static unsigned long table_min = 0;
static unsigned long table_max = ~0;
#endif

#ifdef CONFIG_SYSCTL
static struct ctl_table_header *spl_header = NULL;
static struct proc_dir_entry *proc_sys = NULL;
static struct proc_dir_entry *proc_sys_spl = NULL;
#ifdef DEBUG_MUTEX
static struct proc_dir_entry *proc_sys_spl_mutex = NULL;
static struct proc_dir_entry *proc_sys_spl_mutex_stats = NULL;
#endif
#ifdef DEBUG_KMEM
static struct proc_dir_entry *proc_sys_spl_kmem = NULL;
#endif
#ifdef DEBUG_KSTAT
struct proc_dir_entry *proc_sys_spl_kstat = NULL;
#endif
#endif

#define CTL_SPL		0x87
#define CTL_SPL_DEBUG	0x88
#define CTL_SPL_MUTEX	0x89
#define CTL_SPL_KMEM	0x90
#define CTL_SPL_KSTAT	0x91

enum {
	CTL_VERSION = 1,          /* Version */
	CTL_HOSTID,               /* Host id reported by /usr/bin/hostid */
	CTL_HW_SERIAL,            /* Hardware serial number from hostid */

	CTL_DEBUG_SUBSYS,         /* Debug subsystem */
        CTL_DEBUG_MASK,           /* Debug mask */
        CTL_DEBUG_PRINTK,         /* Force all messages to console */
        CTL_DEBUG_MB,             /* Debug buffer size */
        CTL_DEBUG_BINARY,         /* Include binary data in buffer */
        CTL_DEBUG_CATASTROPHE,    /* Set if we have BUG'd or panic'd */
        CTL_DEBUG_PANIC_ON_BUG,   /* Set if we should panic on BUG */
        CTL_DEBUG_PATH,           /* Dump log location */
        CTL_DEBUG_DUMP,           /* Dump debug buffer to file */
        CTL_DEBUG_FORCE_BUG,      /* Hook to force a BUG */
        CTL_DEBUG_STACK_SIZE,     /* Max observed stack size */

	CTL_CONSOLE_RATELIMIT,    /* Ratelimit console messages */
        CTL_CONSOLE_MAX_DELAY_CS, /* Max delay at which we skip messages */
        CTL_CONSOLE_MIN_DELAY_CS, /* Init delay at which we skip messages */
        CTL_CONSOLE_BACKOFF,      /* Delay increase factor */

#ifdef DEBUG_KMEM
        CTL_KMEM_KMEMUSED,        /* Crrently alloc'd kmem bytes */
        CTL_KMEM_KMEMMAX,         /* Max alloc'd by kmem bytes */
        CTL_KMEM_VMEMUSED,        /* Currently alloc'd vmem bytes */
        CTL_KMEM_VMEMMAX,         /* Max alloc'd by vmem bytes */
#endif

	CTL_MUTEX_STATS,          /* Global mutex statistics */
	CTL_MUTEX_STATS_PER,      /* Per mutex statistics */
	CTL_MUTEX_SPIN_MAX,       /* Maximum mutex spin iterations */
};

static int
proc_copyin_string(char *kbuffer, int kbuffer_size,
                   const char *ubuffer, int ubuffer_size)
{
        int size;

        if (ubuffer_size > kbuffer_size)
                return -EOVERFLOW;

        if (copy_from_user((void *)kbuffer, (void *)ubuffer, ubuffer_size))
                return -EFAULT;

        /* strip trailing whitespace */
        size = strnlen(kbuffer, ubuffer_size);
        while (size-- >= 0)
                if (!isspace(kbuffer[size]))
                        break;

        /* empty string */
        if (size < 0)
                return -EINVAL;

        /* no space to terminate */
        if (size == kbuffer_size)
                return -EOVERFLOW;

        kbuffer[size + 1] = 0;
        return 0;
}

static int
proc_copyout_string(char *ubuffer, int ubuffer_size,
                    const char *kbuffer, char *append)
{
        /* NB if 'append' != NULL, it's a single character to append to the
         * copied out string - usually "\n", for /proc entries and
         * (i.e. a terminating zero byte) for sysctl entries
         */
        int size = MIN(strlen(kbuffer), ubuffer_size);

        if (copy_to_user(ubuffer, kbuffer, size))
                return -EFAULT;

        if (append != NULL && size < ubuffer_size) {
                if (copy_to_user(ubuffer + size, append, 1))
                        return -EFAULT;

                size++;
        }

        return size;
}

static int
proc_dobitmasks(struct ctl_table *table, int write, struct file *filp,
                void __user *buffer, size_t *lenp, loff_t *ppos)
{
        unsigned long *mask = table->data;
        int is_subsys = (mask == &spl_debug_subsys) ? 1 : 0;
        int is_printk = (mask == &spl_debug_printk) ? 1 : 0;
        int size = 512, rc;
        char *str;
        ENTRY;

        str = kmem_alloc(size, KM_SLEEP);
        if (str == NULL)
                RETURN(-ENOMEM);

        if (write) {
                rc = proc_copyin_string(str, size, buffer, *lenp);
                if (rc < 0)
                        RETURN(rc);

                rc = spl_debug_str2mask(mask, str, is_subsys);
                /* Always print BUG/ASSERT to console, so keep this mask */
                if (is_printk)
                        *mask |= D_EMERG;

                *ppos += *lenp;
        } else {
                rc = spl_debug_mask2str(str, size, *mask, is_subsys);
                if (*ppos >= rc)
                        rc = 0;
                else
                        rc = proc_copyout_string(buffer, *lenp,
                                                 str + *ppos, "\n");
                if (rc >= 0) {
                        *lenp = rc;
                        *ppos += rc;
                }
        }

        kmem_free(str, size);
        RETURN(rc);
}

static int
proc_debug_mb(struct ctl_table *table, int write, struct file *filp,
              void __user *buffer, size_t *lenp, loff_t *ppos)
{
        char str[32];
        int rc, len;
        ENTRY;

        if (write) {
                rc = proc_copyin_string(str, sizeof(str), buffer, *lenp);
                if (rc < 0)
                        RETURN(rc);

                rc = spl_debug_set_mb(simple_strtoul(str, NULL, 0));
                *ppos += *lenp;
        } else {
                len = snprintf(str, sizeof(str), "%d", spl_debug_get_mb());
                if (*ppos >= len)
                        rc = 0;
                else
                        rc = proc_copyout_string(buffer, *lenp, str + *ppos, "\n");

                if (rc >= 0) {
                        *lenp = rc;
                        *ppos += rc;
                }
        }

        RETURN(rc);
}

static int
proc_dump_kernel(struct ctl_table *table, int write, struct file *filp,
                 void __user *buffer, size_t *lenp, loff_t *ppos)
{
	ENTRY;

        if (write) {
               spl_debug_dumplog(0);
                *ppos += *lenp;
        } else {
                *lenp = 0;
        }

        RETURN(0);
}

static int
proc_force_bug(struct ctl_table *table, int write, struct file *filp,
               void __user *buffer, size_t *lenp, loff_t *ppos)
{
	ENTRY;

        if (write) {
               CERROR("Crashing due to forced SBUG\n");
               SBUG();
	       /* Unreachable */
        } else {
                *lenp = 0;
	}

	RETURN(0);
}

static int
proc_console_max_delay_cs(struct ctl_table *table, int write, struct file *filp,
                          void __user *buffer, size_t *lenp, loff_t *ppos)
{
        int rc, max_delay_cs;
        struct ctl_table dummy = *table;
        long d;
	ENTRY;

        dummy.data = &max_delay_cs;
        dummy.proc_handler = &proc_dointvec;

        if (write) {
                max_delay_cs = 0;
                rc = proc_dointvec(&dummy, write, filp, buffer, lenp, ppos);
                if (rc < 0)
                        RETURN(rc);

                if (max_delay_cs <= 0)
                        RETURN(-EINVAL);

                d = (max_delay_cs * HZ) / 100;
                if (d == 0 || d < spl_console_min_delay)
                        RETURN(-EINVAL);

                spl_console_max_delay = d;
        } else {
                max_delay_cs = (spl_console_max_delay * 100) / HZ;
                rc = proc_dointvec(&dummy, write, filp, buffer, lenp, ppos);
        }

        RETURN(rc);
}

static int
proc_console_min_delay_cs(struct ctl_table *table, int write, struct file *filp,
                          void __user *buffer, size_t *lenp, loff_t *ppos)
{
        int rc, min_delay_cs;
        struct ctl_table dummy = *table;
        long d;
	ENTRY;

        dummy.data = &min_delay_cs;
        dummy.proc_handler = &proc_dointvec;

        if (write) {
                min_delay_cs = 0;
                rc = proc_dointvec(&dummy, write, filp, buffer, lenp, ppos);
                if (rc < 0)
                        RETURN(rc);

                if (min_delay_cs <= 0)
                        RETURN(-EINVAL);

                d = (min_delay_cs * HZ) / 100;
                if (d == 0 || d > spl_console_max_delay)
                        RETURN(-EINVAL);

                spl_console_min_delay = d;
        } else {
                min_delay_cs = (spl_console_min_delay * 100) / HZ;
                rc = proc_dointvec(&dummy, write, filp, buffer, lenp, ppos);
        }

        RETURN(rc);
}

static int
proc_console_backoff(struct ctl_table *table, int write, struct file *filp,
                     void __user *buffer, size_t *lenp, loff_t *ppos)
{
        int rc, backoff;
        struct ctl_table dummy = *table;
	ENTRY;

        dummy.data = &backoff;
        dummy.proc_handler = &proc_dointvec;

        if (write) {
                backoff = 0;
                rc = proc_dointvec(&dummy, write, filp, buffer, lenp, ppos);
                if (rc < 0)
                        RETURN(rc);

                if (backoff <= 0)
                        RETURN(-EINVAL);

                spl_console_backoff = backoff;
        } else {
                backoff = spl_console_backoff;
                rc = proc_dointvec(&dummy, write, filp, buffer, lenp, ppos);
        }

        RETURN(rc);
}

static int
proc_doatomic64(struct ctl_table *table, int write, struct file *filp,
                void __user *buffer, size_t *lenp, loff_t *ppos)
{
        int rc = 0;
        unsigned long min = 0, max = ~0, val;
        struct ctl_table dummy = *table;
	ENTRY;

        dummy.data = &val;
        dummy.proc_handler = &proc_dointvec;
        dummy.extra1 = &min;
        dummy.extra2 = &max;

        if (write) {
                *ppos += *lenp;
        } else {
                val = atomic_read((atomic64_t *)table->data);
                rc = proc_doulongvec_minmax(&dummy, write, filp,
                                            buffer, lenp, ppos);
        }

        RETURN(rc);
}

static int
proc_dohostid(struct ctl_table *table, int write, struct file *filp,
              void __user *buffer, size_t *lenp, loff_t *ppos)
{
        int len, rc = 0;
        int32_t val;
        char *end, str[32];
	ENTRY;

        if (write) {
		/* We can't use proc_doulongvec_minmax() in the write
		 * case hear because hostid while a hex value has no
		 * leading 0x which confuses the helper function. */
                rc = proc_copyin_string(str, sizeof(str), buffer, *lenp);
                if (rc < 0)
                        RETURN(rc);

                val = simple_strtol(str, &end, 16);
		if (str == end)
			RETURN(-EINVAL);

		spl_hostid = (long)val;
                sprintf(hw_serial, "%u", (val >= 0) ? val : -val);
                *ppos += *lenp;
        } else {
                len = snprintf(str, sizeof(str), "%lx", spl_hostid);
                if (*ppos >= len)
                        rc = 0;
                else
                        rc = proc_copyout_string(buffer, *lenp, str + *ppos, "\n");

                if (rc >= 0) {
                        *lenp = rc;
                        *ppos += rc;
                }
        }

        RETURN(rc);
}

#ifdef DEBUG_MUTEX
static void
mutex_seq_show_headers(struct seq_file *f)
{
        seq_printf(f, "%-36s %-4s %-16s\t"
                   "e_tot\te_nh\te_sp\te_sl\tte_tot\tte_nh\n",
		   "name", "type", "owner");
}

static int
mutex_seq_show(struct seq_file *f, void *p)
{
        kmutex_t *mp = p;
	char t = 'X';
        int i;

	ASSERT(mp->km_magic == KM_MAGIC);

	switch (mp->km_type) {
		case MUTEX_DEFAULT:	t = 'D';	break;
		case MUTEX_SPIN:	t = 'S';	break;
		case MUTEX_ADAPTIVE:	t = 'A';	break;
		default:
			SBUG();
	}
        seq_printf(f, "%-36s %c    ", mp->km_name, t);
	if (mp->km_owner)
                seq_printf(f, "%p\t", mp->km_owner);
	else
                seq_printf(f, "%-16s\t", "<not held>");

        for (i = 0; i < MUTEX_STATS_SIZE; i++)
                seq_printf(f, "%d%c", mp->km_stats[i],
                           (i + 1 == MUTEX_STATS_SIZE) ? '\n' : '\t');

        return 0;
}

static void *
mutex_seq_start(struct seq_file *f, loff_t *pos)
{
        struct list_head *p;
        loff_t n = *pos;
        ENTRY;

	spin_lock(&mutex_stats_lock);
        if (!n)
                mutex_seq_show_headers(f);

        p = mutex_stats_list.next;
        while (n--) {
                p = p->next;
                if (p == &mutex_stats_list)
                        RETURN(NULL);
        }

        RETURN(list_entry(p, kmutex_t, km_list));
}

static void *
mutex_seq_next(struct seq_file *f, void *p, loff_t *pos)
{
	kmutex_t *mp = p;
        ENTRY;

        ++*pos;
        RETURN((mp->km_list.next == &mutex_stats_list) ?
	       NULL : list_entry(mp->km_list.next, kmutex_t, km_list));
}

static void
mutex_seq_stop(struct seq_file *f, void *v)
{
	spin_unlock(&mutex_stats_lock);
}

static struct seq_operations mutex_seq_ops = {
        .show  = mutex_seq_show,
        .start = mutex_seq_start,
        .next  = mutex_seq_next,
        .stop  = mutex_seq_stop,
};

static int
proc_mutex_open(struct inode *inode, struct file *filp)
{
        return seq_open(filp, &mutex_seq_ops);
}

static struct file_operations proc_mutex_operations = {
        .open           = proc_mutex_open,
        .read           = seq_read,
        .llseek         = seq_lseek,
        .release        = seq_release,
};
#endif /* DEBUG_MUTEX */

static struct ctl_table spl_debug_table[] = {
        {
                .ctl_name = CTL_DEBUG_SUBSYS,
                .procname = "subsystem",
                .data     = &spl_debug_subsys,
                .maxlen   = sizeof(unsigned long),
                .mode     = 0644,
                .proc_handler = &proc_dobitmasks
        },
        {
                .ctl_name = CTL_DEBUG_MASK,
                .procname = "mask",
                .data     = &spl_debug_mask,
                .maxlen   = sizeof(unsigned long),
                .mode     = 0644,
                .proc_handler = &proc_dobitmasks
        },
        {
                .ctl_name = CTL_DEBUG_PRINTK,
                .procname = "printk",
                .data     = &spl_debug_printk,
                .maxlen   = sizeof(unsigned long),
                .mode     = 0644,
                .proc_handler = &proc_dobitmasks
        },
        {
                .ctl_name = CTL_DEBUG_MB,
                .procname = "mb",
                .mode     = 0644,
                .proc_handler = &proc_debug_mb,
        },
        {
                .ctl_name = CTL_DEBUG_BINARY,
                .procname = "binary",
                .data     = &spl_debug_binary,
                .maxlen   = sizeof(int),
                .mode     = 0644,
                .proc_handler = &proc_dointvec,
        },
        {
                .ctl_name = CTL_DEBUG_CATASTROPHE,
                .procname = "catastrophe",
                .data     = &spl_debug_catastrophe,
                .maxlen   = sizeof(int),
                .mode     = 0444,
                .proc_handler = &proc_dointvec,
        },
        {
                .ctl_name = CTL_DEBUG_PANIC_ON_BUG,
                .procname = "panic_on_bug",
                .data     = &spl_debug_panic_on_bug,
                .maxlen   = sizeof(int),
                .mode     = 0644,
                .proc_handler = &proc_dointvec
        },
        {
                .ctl_name = CTL_DEBUG_PATH,
                .procname = "path",
                .data     = spl_debug_file_path,
                .maxlen   = sizeof(spl_debug_file_path),
                .mode     = 0644,
                .proc_handler = &proc_dostring,
        },
        {
                .ctl_name = CTL_DEBUG_DUMP,
                .procname = "dump",
                .mode     = 0200,
                .proc_handler = &proc_dump_kernel,
        },
        {       .ctl_name = CTL_DEBUG_FORCE_BUG,
                .procname = "force_bug",
                .mode     = 0200,
                .proc_handler = &proc_force_bug,
        },
        {
                .ctl_name = CTL_CONSOLE_RATELIMIT,
                .procname = "console_ratelimit",
                .data     = &spl_console_ratelimit,
                .maxlen   = sizeof(int),
                .mode     = 0644,
                .proc_handler = &proc_dointvec,
        },
        {
                .ctl_name = CTL_CONSOLE_MAX_DELAY_CS,
                .procname = "console_max_delay_centisecs",
                .maxlen   = sizeof(int),
                .mode     = 0644,
                .proc_handler = &proc_console_max_delay_cs,
        },
        {
                .ctl_name = CTL_CONSOLE_MIN_DELAY_CS,
                .procname = "console_min_delay_centisecs",
                .maxlen   = sizeof(int),
                .mode     = 0644,
                .proc_handler = &proc_console_min_delay_cs,
        },
        {
                .ctl_name = CTL_CONSOLE_BACKOFF,
                .procname = "console_backoff",
                .maxlen   = sizeof(int),
                .mode     = 0644,
                .proc_handler = &proc_console_backoff,
        },
        {
                .ctl_name = CTL_DEBUG_STACK_SIZE,
                .procname = "stack_max",
                .data     = &spl_debug_stack,
                .maxlen   = sizeof(int),
                .mode     = 0444,
                .proc_handler = &proc_dointvec,
        },
	{0},
};

#ifdef DEBUG_MUTEX
static struct ctl_table spl_mutex_table[] = {
        {
                .ctl_name = CTL_MUTEX_STATS,
                .procname = "stats",
                .data     = &mutex_stats,
                .maxlen   = sizeof(int) * MUTEX_STATS_SIZE,
                .mode     = 0444,
                .proc_handler = &proc_dointvec,
        },
        {
                .ctl_name = CTL_MUTEX_SPIN_MAX,
                .procname = "spin_max",
                .data     = &mutex_spin_max,
                .maxlen   = sizeof(int),
                .mode     = 0644,
                .proc_handler = &proc_dointvec,
        },
	{0},
};
#endif /* DEBUG_MUTEX */

#ifdef DEBUG_KMEM
static struct ctl_table spl_kmem_table[] = {
        {
                .ctl_name = CTL_KMEM_KMEMUSED,
                .procname = "kmem_used",
                .data     = &kmem_alloc_used,
                .maxlen   = sizeof(atomic64_t),
                .mode     = 0444,
                .proc_handler = &proc_doatomic64,
        },
        {
                .ctl_name = CTL_KMEM_KMEMMAX,
                .procname = "kmem_max",
                .data     = &kmem_alloc_max,
                .maxlen   = sizeof(unsigned long),
                .extra1   = &table_min,
                .extra2   = &table_max,
                .mode     = 0444,
                .proc_handler = &proc_doulongvec_minmax,
        },
        {
                .ctl_name = CTL_KMEM_VMEMUSED,
                .procname = "vmem_used",
                .data     = &vmem_alloc_used,
                .maxlen   = sizeof(atomic64_t),
                .mode     = 0444,
                .proc_handler = &proc_doatomic64,
        },
        {
                .ctl_name = CTL_KMEM_VMEMMAX,
                .procname = "vmem_max",
                .data     = &vmem_alloc_max,
                .maxlen   = sizeof(unsigned long),
                .extra1   = &table_min,
                .extra2   = &table_max,
                .mode     = 0444,
                .proc_handler = &proc_doulongvec_minmax,
        },
	{0},
};
#endif /* DEBUG_KMEM */

#ifdef DEBUG_KSTAT
static struct ctl_table spl_kstat_table[] = {
	{0},
};
#endif /* DEBUG_KSTAT */

static struct ctl_table spl_table[] = {
        /* NB No .strategy entries have been provided since
         * sysctl(8) prefers to go via /proc for portability.
         */
        {
                .ctl_name = CTL_VERSION,
                .procname = "version",
                .data     = spl_version,
                .maxlen   = sizeof(spl_version),
                .mode     = 0444,
                .proc_handler = &proc_dostring,
        },
        {
                .ctl_name = CTL_HOSTID,
                .procname = "hostid",
                .data     = &spl_hostid,
                .maxlen   = sizeof(unsigned long),
                .mode     = 0644,
                .proc_handler = &proc_dohostid,
        },
        {
                .ctl_name = CTL_HW_SERIAL,
                .procname = "hw_serial",
                .data     = hw_serial,
                .maxlen   = sizeof(hw_serial),
                .mode     = 0444,
                .proc_handler = &proc_dostring,
        },
	{
		.ctl_name = CTL_SPL_DEBUG,
		.procname = "debug",
		.mode     = 0555,
		.child    = spl_debug_table,
	},
#ifdef DEBUG_MUTEX
	{
		.ctl_name = CTL_SPL_MUTEX,
		.procname = "mutex",
		.mode     = 0555,
		.child    = spl_mutex_table,
	},
#endif
#ifdef DEBUG_KMEM
	{
		.ctl_name = CTL_SPL_KMEM,
		.procname = "kmem",
		.mode     = 0555,
		.child    = spl_kmem_table,
	},
#endif
#ifdef DEBUG_KSTAT
	{
		.ctl_name = CTL_SPL_KSTAT,
		.procname = "kstat",
		.mode     = 0555,
		.child    = spl_kstat_table,
	},
#endif
        { 0 },
};

static struct ctl_table spl_dir[] = {
        {
                .ctl_name = CTL_SPL,
                .procname = "spl",
                .mode     = 0555,
                .child    = spl_table,
        },
        {0}
};

static int
proc_dir_entry_match(int len, const char *name, struct proc_dir_entry *de)
{
        if (de->namelen != len)
                return 0;

        return !memcmp(name, de->name, len);
}

struct proc_dir_entry *
proc_dir_entry_find(struct proc_dir_entry *root, const char *str)
{
	struct proc_dir_entry *de;

	for (de = root->subdir; de; de = de->next)
		if (proc_dir_entry_match(strlen(str), str, de))
			return de;

	return NULL;
}

int
proc_dir_entries(struct proc_dir_entry *root)
{
	struct proc_dir_entry *de;
	int i = 0;

	for (de = root->subdir; de; de = de->next)
		i++;

	return i;
}

int
proc_init(void)
{
	int rc = 0;
        ENTRY;

#ifdef CONFIG_SYSCTL
        spl_header = register_sysctl_table(spl_dir, 0);
	if (spl_header == NULL)
		RETURN(-EUNATCH);

	proc_sys = proc_dir_entry_find(&proc_root, "sys");
	if (proc_sys == NULL)
		GOTO(out, rc = -EUNATCH);

	proc_sys_spl = proc_dir_entry_find(proc_sys, "spl");
	if (proc_sys_spl == NULL)
		GOTO(out, rc = -EUNATCH);

#ifdef DEBUG_MUTEX
	proc_sys_spl_mutex = proc_dir_entry_find(proc_sys_spl, "mutex");
	if (proc_sys_spl_mutex == NULL)
		GOTO(out, rc = -EUNATCH);

	proc_sys_spl_mutex_stats = create_proc_entry("stats_per", 0444,
						     proc_sys_spl_mutex);
        if (proc_sys_spl_mutex_stats == NULL)
		GOTO(out, rc = -EUNATCH);

        proc_sys_spl_mutex_stats->proc_fops = &proc_mutex_operations;
#endif /* DEBUG_MUTEX */

#ifdef DEBUG_KMEM
        proc_sys_spl_kmem = proc_dir_entry_find(proc_sys_spl, "kmem");
	        if (proc_sys_spl_kmem == NULL)
	                GOTO(out2, rc = -EUNATCH);
#endif /* DEBUG_KMEM */

#ifdef DEBUG_KSTAT
        proc_sys_spl_kstat = proc_dir_entry_find(proc_sys_spl, "kstat");
	        if (proc_sys_spl_kstat == NULL)
	                GOTO(out2, rc = -EUNATCH);
#endif /* DEBUG_KSTAT */

	RETURN(rc);
out2:
        remove_proc_entry("stats_per", proc_sys_spl_mutex);
out:
        unregister_sysctl_table(spl_header);
#endif /* CONFIG_SYSCTL */
        RETURN(rc);
}

void
proc_fini(void)
{
        ENTRY;

#ifdef CONFIG_SYSCTL
        ASSERT(spl_header != NULL);
        remove_proc_entry("stats_per", proc_sys_spl_mutex);
        unregister_sysctl_table(spl_header);
#endif
        EXIT;
}
Commit	Line	Data
04a479f7	1	#include <sys/proc.h>
57d1b188	2
	3	#ifdef DEBUG_SUBSYSTEM
	4	#undef DEBUG_SUBSYSTEM
	5	#endif
	6
	7	#define DEBUG_SUBSYSTEM S_PROC
	8
404992e3	9	#ifdef DEBUG_KMEM
57d1b188	10	static unsigned long table_min = 0;
57d1b188	11	static unsigned long table_max = ~0;
404992e3	12	#endif
	13
	14	#ifdef CONFIG_SYSCTL
	15	static struct ctl_table_header *spl_header = NULL;
	16	static struct proc_dir_entry *proc_sys = NULL;
	17	static struct proc_dir_entry *proc_sys_spl = NULL;
	18	#ifdef DEBUG_MUTEX
	19	static struct proc_dir_entry *proc_sys_spl_mutex = NULL;
	20	static struct proc_dir_entry *proc_sys_spl_mutex_stats = NULL;
	21	#endif
04a479f7	22	#ifdef DEBUG_KMEM
	23	static struct proc_dir_entry *proc_sys_spl_kmem = NULL;
	24	#endif
	25	#ifdef DEBUG_KSTAT
	26	struct proc_dir_entry *proc_sys_spl_kstat = NULL;
	27	#endif
404992e3	28	#endif
57d1b188	29
9ab1ac14	30	#define CTL_SPL 0x87
	31	#define CTL_SPL_DEBUG 0x88
	32	#define CTL_SPL_MUTEX 0x89
	33	#define CTL_SPL_KMEM 0x90
04a479f7	34	#define CTL_SPL_KSTAT 0x91
9ab1ac14	35
57d1b188	36	enum {
3561541c	37	CTL_VERSION = 1, /* Version */
9ab1ac14	38	CTL_HOSTID, /* Host id reported by /usr/bin/hostid */
	39	CTL_HW_SERIAL, /* Hardware serial number from hostid */
	40
	41	CTL_DEBUG_SUBSYS, /* Debug subsystem */
57d1b188	42	CTL_DEBUG_MASK, /* Debug mask */
	43	CTL_DEBUG_PRINTK, /* Force all messages to console */
	44	CTL_DEBUG_MB, /* Debug buffer size */
	45	CTL_DEBUG_BINARY, /* Include binary data in buffer */
	46	CTL_DEBUG_CATASTROPHE, /* Set if we have BUG'd or panic'd */
	47	CTL_DEBUG_PANIC_ON_BUG, /* Set if we should panic on BUG */
	48	CTL_DEBUG_PATH, /* Dump log location */
	49	CTL_DEBUG_DUMP, /* Dump debug buffer to file */
	50	CTL_DEBUG_FORCE_BUG, /* Hook to force a BUG */
9ab1ac14	51	CTL_DEBUG_STACK_SIZE, /* Max observed stack size */
	52
	53	CTL_CONSOLE_RATELIMIT, /* Ratelimit console messages */
57d1b188	54	CTL_CONSOLE_MAX_DELAY_CS, /* Max delay at which we skip messages */
	55	CTL_CONSOLE_MIN_DELAY_CS, /* Init delay at which we skip messages */
	56	CTL_CONSOLE_BACKOFF, /* Delay increase factor */
9ab1ac14	57
57d1b188	58	#ifdef DEBUG_KMEM
	59	CTL_KMEM_KMEMUSED, /* Crrently alloc'd kmem bytes */
	60	CTL_KMEM_KMEMMAX, /* Max alloc'd by kmem bytes */
	61	CTL_KMEM_VMEMUSED, /* Currently alloc'd vmem bytes */
	62	CTL_KMEM_VMEMMAX, /* Max alloc'd by vmem bytes */
	63	#endif
9ab1ac14	64
	65	CTL_MUTEX_STATS, /* Global mutex statistics */
	66	CTL_MUTEX_STATS_PER, /* Per mutex statistics */
	67	CTL_MUTEX_SPIN_MAX, /* Maximum mutex spin iterations */
57d1b188	68	};
	69
	70	static int
	71	proc_copyin_string(char *kbuffer, int kbuffer_size,
	72	const char *ubuffer, int ubuffer_size)
	73	{
	74	int size;
	75
	76	if (ubuffer_size > kbuffer_size)
	77	return -EOVERFLOW;
	78
	79	if (copy_from_user((void )kbuffer, (void )ubuffer, ubuffer_size))
	80	return -EFAULT;
	81
	82	/* strip trailing whitespace */
	83	size = strnlen(kbuffer, ubuffer_size);
	84	while (size-- >= 0)
	85	if (!isspace(kbuffer[size]))
	86	break;
	87
	88	/* empty string */
	89	if (size < 0)
	90	return -EINVAL;
	91
	92	/* no space to terminate */
	93	if (size == kbuffer_size)
	94	return -EOVERFLOW;
	95
	96	kbuffer[size + 1] = 0;
	97	return 0;
	98	}
	99
	100	static int
	101	proc_copyout_string(char *ubuffer, int ubuffer_size,
	102	const char kbuffer, char append)
	103	{
	104	/* NB if 'append' != NULL, it's a single character to append to the
	105	* copied out string - usually "\n", for /proc entries and
	106	* (i.e. a terminating zero byte) for sysctl entries
	107	*/
	108	int size = MIN(strlen(kbuffer), ubuffer_size);
	109
	110	if (copy_to_user(ubuffer, kbuffer, size))
	111	return -EFAULT;
	112
	113	if (append != NULL && size < ubuffer_size) {
	114	if (copy_to_user(ubuffer + size, append, 1))
	115	return -EFAULT;
	116
	117	size++;
	118	}
	119
	120	return size;
	121	}
	122
	123	static int
	124	proc_dobitmasks(struct ctl_table table, int write, struct file filp,
	125	void __user buffer, size_t lenp, loff_t *ppos)
	126	{
	127	unsigned long *mask = table->data;
	128	int is_subsys = (mask == &spl_debug_subsys) ? 1 : 0;
	129	int is_printk = (mask == &spl_debug_printk) ? 1 : 0;
	130	int size = 512, rc;
	131	char *str;
132	ENTRY;
133
134	str = kmem_alloc(size, KM_SLEEP);
135	if (str == NULL)
136	RETURN(-ENOMEM);
137
138	if (write) {
139	rc = proc_copyin_string(str, size, buffer, *lenp);
140	if (rc < 0)
141	RETURN(rc);
142
143	rc = spl_debug_str2mask(mask, str, is_subsys);
144	/* Always print BUG/ASSERT to console, so keep this mask */
145	if (is_printk)
146	*mask \|= D_EMERG;
147
148	ppos += lenp;
149	} else {
150	rc = spl_debug_mask2str(str, size, *mask, is_subsys);
151	if (*ppos >= rc)
152	rc = 0;
153	else
154	rc = proc_copyout_string(buffer, *lenp,
155	str + *ppos, "\n");
156	if (rc >= 0) {
157	*lenp = rc;
158	*ppos += rc;
159	}
160	}
161
162	kmem_free(str, size);
163	RETURN(rc);
164	}
165
166	static int
167	proc_debug_mb(struct ctl_table table, int write, struct file filp,
168	void __user buffer, size_t lenp, loff_t *ppos)
169	{
170	char str[32];
171	int rc, len;
172	ENTRY;
173
174	if (write) {
175	rc = proc_copyin_string(str, sizeof(str), buffer, *lenp);
176	if (rc < 0)
177	RETURN(rc);
178
179	rc = spl_debug_set_mb(simple_strtoul(str, NULL, 0));
180	ppos += lenp;
181	} else {
182	len = snprintf(str, sizeof(str), "%d", spl_debug_get_mb());
183	if (*ppos >= len)
184	rc = 0;
185	else
186	rc = proc_copyout_string(buffer, lenp, str + ppos, "\n");
187
188	if (rc >= 0) {
189	*lenp = rc;
190	*ppos += rc;
191	}
192	}
193
194	RETURN(rc);
195	}
196
197	static int
198	proc_dump_kernel(struct ctl_table table, int write, struct file filp,
199	void __user buffer, size_t lenp, loff_t *ppos)
200	{
201	ENTRY;
202
203	if (write) {
7fea96c0	204	spl_debug_dumplog(0);
57d1b188	205	ppos += lenp;
	206	} else {
	207	*lenp = 0;
	208	}
	209
	210	RETURN(0);
	211	}
	212
	213	static int
	214	proc_force_bug(struct ctl_table table, int write, struct file filp,
	215	void __user buffer, size_t lenp, loff_t *ppos)
	216	{
	217	ENTRY;
	218
	219	if (write) {
2fae1b3d	220	CERROR("Crashing due to forced SBUG\n");
2fae1b3d	221	SBUG();
57d1b188	222	/* Unreachable */
	223	} else {
	224	*lenp = 0;
	225	}
	226
	227	RETURN(0);
	228	}
	229
	230	static int
	231	proc_console_max_delay_cs(struct ctl_table table, int write, struct file filp,
	232	void __user buffer, size_t lenp, loff_t *ppos)
	233	{
	234	int rc, max_delay_cs;
	235	struct ctl_table dummy = *table;
	236	long d;
	237	ENTRY;
	238
	239	dummy.data = &max_delay_cs;
	240	dummy.proc_handler = &proc_dointvec;
	241
	242	if (write) {
	243	max_delay_cs = 0;
	244	rc = proc_dointvec(&dummy, write, filp, buffer, lenp, ppos);
	245	if (rc < 0)
	246	RETURN(rc);
	247
	248	if (max_delay_cs <= 0)
	249	RETURN(-EINVAL);
	250
	251	d = (max_delay_cs * HZ) / 100;
	252	if (d == 0 \|\| d < spl_console_min_delay)
	253	RETURN(-EINVAL);
	254
	255	spl_console_max_delay = d;
	256	} else {
	257	max_delay_cs = (spl_console_max_delay * 100) / HZ;
	258	rc = proc_dointvec(&dummy, write, filp, buffer, lenp, ppos);
	259	}
	260
	261	RETURN(rc);
	262	}
	263
	264	static int
	265	proc_console_min_delay_cs(struct ctl_table table, int write, struct file filp,
	266	void __user buffer, size_t lenp, loff_t *ppos)
	267	{
	268	int rc, min_delay_cs;
	269	struct ctl_table dummy = *table;
	270	long d;
	271	ENTRY;
	272
	273	dummy.data = &min_delay_cs;
	274	dummy.proc_handler = &proc_dointvec;
	275
	276	if (write) {
	277	min_delay_cs = 0;
	278	rc = proc_dointvec(&dummy, write, filp, buffer, lenp, ppos);
	279	if (rc < 0)
	280	RETURN(rc);
	281
	282	if (min_delay_cs <= 0)
	283	RETURN(-EINVAL);
	284
	285	d = (min_delay_cs * HZ) / 100;
286	if (d == 0 \|\| d > spl_console_max_delay)
287	RETURN(-EINVAL);
288
289	spl_console_min_delay = d;
290	} else {
291	min_delay_cs = (spl_console_min_delay * 100) / HZ;
292	rc = proc_dointvec(&dummy, write, filp, buffer, lenp, ppos);
293	}
294
295	RETURN(rc);
296	}
297
298	static int
299	proc_console_backoff(struct ctl_table table, int write, struct file filp,
300	void __user buffer, size_t lenp, loff_t *ppos)
301	{
302	int rc, backoff;
303	struct ctl_table dummy = *table;
304	ENTRY;
305
306	dummy.data = &backoff;
307	dummy.proc_handler = &proc_dointvec;
308
309	if (write) {
310	backoff = 0;
311	rc = proc_dointvec(&dummy, write, filp, buffer, lenp, ppos);
312	if (rc < 0)
313	RETURN(rc);
314
315	if (backoff <= 0)
316	RETURN(-EINVAL);
317
318	spl_console_backoff = backoff;
319	} else {
320	backoff = spl_console_backoff;
321	rc = proc_dointvec(&dummy, write, filp, buffer, lenp, ppos);
322	}
323
324	RETURN(rc);
325	}
326
327	static int
328	proc_doatomic64(struct ctl_table table, int write, struct file filp,
329	void __user buffer, size_t lenp, loff_t *ppos)
330	{
331	int rc = 0;
332	unsigned long min = 0, max = ~0, val;
333	struct ctl_table dummy = *table;
334	ENTRY;
335
336	dummy.data = &val;
337	dummy.proc_handler = &proc_dointvec;
338	dummy.extra1 = &min;
339	dummy.extra2 = &max;
340
341	if (write) {
342	ppos += lenp;
343	} else {
344	val = atomic_read((atomic64_t *)table->data);
345	rc = proc_doulongvec_minmax(&dummy, write, filp,
346	buffer, lenp, ppos);
347	}
348
349	RETURN(rc);
350	}
351
352	static int
353	proc_dohostid(struct ctl_table table, int write, struct file filp,
354	void __user buffer, size_t lenp, loff_t *ppos)
355	{
356	int len, rc = 0;
937879f1	357	int32_t val;
57d1b188	358	char *end, str[32];
	359	ENTRY;
	360
	361	if (write) {
	362	/* We can't use proc_doulongvec_minmax() in the write
	363	* case hear because hostid while a hex value has no
	364	* leading 0x which confuses the helper function. */
	365	rc = proc_copyin_string(str, sizeof(str), buffer, *lenp);
	366	if (rc < 0)
	367	RETURN(rc);
	368
937879f1	369	val = simple_strtol(str, &end, 16);
57d1b188	370	if (str == end)
	371	RETURN(-EINVAL);
	372
937879f1	373	spl_hostid = (long)val;
937879f1	374	sprintf(hw_serial, "%u", (val >= 0) ? val : -val);
57d1b188	375	ppos += lenp;
	376	} else {
	377	len = snprintf(str, sizeof(str), "%lx", spl_hostid);
	378	if (*ppos >= len)
	379	rc = 0;
	380	else
	381	rc = proc_copyout_string(buffer, lenp, str + ppos, "\n");
	382
	383	if (rc >= 0) {
	384	*lenp = rc;
	385	*ppos += rc;
	386	}
	387	}
	388
	389	RETURN(rc);
	390	}
	391
9ab1ac14	392	#ifdef DEBUG_MUTEX
	393	static void
	394	mutex_seq_show_headers(struct seq_file *f)
	395	{
	396	seq_printf(f, "%-36s %-4s %-16s\t"
	397	"e_tot\te_nh\te_sp\te_sl\tte_tot\tte_nh\n",
	398	"name", "type", "owner");
	399	}
	400
	401	static int
	402	mutex_seq_show(struct seq_file f, void p)
	403	{
	404	kmutex_t *mp = p;
	405	char t = 'X';
	406	int i;
	407
	408	ASSERT(mp->km_magic == KM_MAGIC);
	409
	410	switch (mp->km_type) {
	411	case MUTEX_DEFAULT: t = 'D'; break;
	412	case MUTEX_SPIN: t = 'S'; break;
	413	case MUTEX_ADAPTIVE: t = 'A'; break;
	414	default:
	415	SBUG();
	416	}
	417	seq_printf(f, "%-36s %c ", mp->km_name, t);
	418	if (mp->km_owner)
	419	seq_printf(f, "%p\t", mp->km_owner);
	420	else
	421	seq_printf(f, "%-16s\t", "<not held>");
	422
	423	for (i = 0; i < MUTEX_STATS_SIZE; i++)
	424	seq_printf(f, "%d%c", mp->km_stats[i],
	425	(i + 1 == MUTEX_STATS_SIZE) ? '\n' : '\t');
	426
	427	return 0;
	428	}
	429
	430	static void *
	431	mutex_seq_start(struct seq_file f, loff_t pos)
	432	{
	433	struct list_head *p;
	434	loff_t n = *pos;
	435	ENTRY;
	436
404992e3	437	spin_lock(&mutex_stats_lock);
9ab1ac14	438	if (!n)
	439	mutex_seq_show_headers(f);
	440
	441	p = mutex_stats_list.next;
	442	while (n--) {
	443	p = p->next;
	444	if (p == &mutex_stats_list)
	445	RETURN(NULL);
	446	}
	447
	448	RETURN(list_entry(p, kmutex_t, km_list));
	449	}
	450
	451	static void *
	452	mutex_seq_next(struct seq_file f, void p, loff_t *pos)
	453	{
	454	kmutex_t *mp = p;
	455	ENTRY;
	456
	457	++*pos;
	458	RETURN((mp->km_list.next == &mutex_stats_list) ?
	459	NULL : list_entry(mp->km_list.next, kmutex_t, km_list));
	460	}
	461
	462	static void
	463	mutex_seq_stop(struct seq_file f, void v)
	464	{
404992e3	465	spin_unlock(&mutex_stats_lock);
9ab1ac14	466	}
	467
	468	static struct seq_operations mutex_seq_ops = {
	469	.show = mutex_seq_show,
	470	.start = mutex_seq_start,
	471	.next = mutex_seq_next,
	472	.stop = mutex_seq_stop,
	473	};
	474
	475	static int
	476	proc_mutex_open(struct inode inode, struct file filp)
	477	{
	478	return seq_open(filp, &mutex_seq_ops);
	479	}
	480
	481	static struct file_operations proc_mutex_operations = {
	482	.open = proc_mutex_open,
	483	.read = seq_read,
	484	.llseek = seq_lseek,
	485	.release = seq_release,
	486	};
	487	#endif /* DEBUG_MUTEX */
	488
	489	static struct ctl_table spl_debug_table[] = {
57d1b188	490	{
57d1b188	491	.ctl_name = CTL_DEBUG_SUBSYS,
9ab1ac14	492	.procname = "subsystem",
57d1b188	493	.data = &spl_debug_subsys,
	494	.maxlen = sizeof(unsigned long),
	495	.mode = 0644,
	496	.proc_handler = &proc_dobitmasks
	497	},
	498	{
	499	.ctl_name = CTL_DEBUG_MASK,
9ab1ac14	500	.procname = "mask",
57d1b188	501	.data = &spl_debug_mask,
	502	.maxlen = sizeof(unsigned long),
	503	.mode = 0644,
	504	.proc_handler = &proc_dobitmasks
	505	},
	506	{
	507	.ctl_name = CTL_DEBUG_PRINTK,
9ab1ac14	508	.procname = "printk",
57d1b188	509	.data = &spl_debug_printk,
	510	.maxlen = sizeof(unsigned long),
	511	.mode = 0644,
	512	.proc_handler = &proc_dobitmasks
	513	},
	514	{
	515	.ctl_name = CTL_DEBUG_MB,
9ab1ac14	516	.procname = "mb",
57d1b188	517	.mode = 0644,
	518	.proc_handler = &proc_debug_mb,
	519	},
	520	{
	521	.ctl_name = CTL_DEBUG_BINARY,
9ab1ac14	522	.procname = "binary",
57d1b188	523	.data = &spl_debug_binary,
	524	.maxlen = sizeof(int),
	525	.mode = 0644,
	526	.proc_handler = &proc_dointvec,
	527	},
	528	{
	529	.ctl_name = CTL_DEBUG_CATASTROPHE,
	530	.procname = "catastrophe",
	531	.data = &spl_debug_catastrophe,
	532	.maxlen = sizeof(int),
	533	.mode = 0444,
	534	.proc_handler = &proc_dointvec,
	535	},
	536	{
	537	.ctl_name = CTL_DEBUG_PANIC_ON_BUG,
	538	.procname = "panic_on_bug",
	539	.data = &spl_debug_panic_on_bug,
	540	.maxlen = sizeof(int),
	541	.mode = 0644,
	542	.proc_handler = &proc_dointvec
	543	},
	544	{
	545	.ctl_name = CTL_DEBUG_PATH,
9ab1ac14	546	.procname = "path",
57d1b188	547	.data = spl_debug_file_path,
	548	.maxlen = sizeof(spl_debug_file_path),
	549	.mode = 0644,
	550	.proc_handler = &proc_dostring,
	551	},
	552	{
	553	.ctl_name = CTL_DEBUG_DUMP,
9ab1ac14	554	.procname = "dump",
57d1b188	555	.mode = 0200,
	556	.proc_handler = &proc_dump_kernel,
	557	},
	558	{ .ctl_name = CTL_DEBUG_FORCE_BUG,
	559	.procname = "force_bug",
	560	.mode = 0200,
	561	.proc_handler = &proc_force_bug,
	562	},
	563	{
	564	.ctl_name = CTL_CONSOLE_RATELIMIT,
	565	.procname = "console_ratelimit",
	566	.data = &spl_console_ratelimit,
	567	.maxlen = sizeof(int),
	568	.mode = 0644,
	569	.proc_handler = &proc_dointvec,
	570	},
	571	{
	572	.ctl_name = CTL_CONSOLE_MAX_DELAY_CS,
	573	.procname = "console_max_delay_centisecs",
	574	.maxlen = sizeof(int),
	575	.mode = 0644,
	576	.proc_handler = &proc_console_max_delay_cs,
	577	},
	578	{
	579	.ctl_name = CTL_CONSOLE_MIN_DELAY_CS,
	580	.procname = "console_min_delay_centisecs",
	581	.maxlen = sizeof(int),
	582	.mode = 0644,
	583	.proc_handler = &proc_console_min_delay_cs,
	584	},
	585	{
	586	.ctl_name = CTL_CONSOLE_BACKOFF,
	587	.procname = "console_backoff",
	588	.maxlen = sizeof(int),
	589	.mode = 0644,
	590	.proc_handler = &proc_console_backoff,
	591	},
	592	{
9ab1ac14	593	.ctl_name = CTL_DEBUG_STACK_SIZE,
57d1b188	594	.procname = "stack_max",
	595	.data = &spl_debug_stack,
	596	.maxlen = sizeof(int),
	597	.mode = 0444,
	598	.proc_handler = &proc_dointvec,
	599	},
9ab1ac14	600	{0},
	601	};
	602
	603	#ifdef DEBUG_MUTEX
	604	static struct ctl_table spl_mutex_table[] = {
	605	{
	606	.ctl_name = CTL_MUTEX_STATS,
	607	.procname = "stats",
	608	.data = &mutex_stats,
	609	.maxlen = sizeof(int) * MUTEX_STATS_SIZE,
	610	.mode = 0444,
	611	.proc_handler = &proc_dointvec,
	612	},
	613	{
	614	.ctl_name = CTL_MUTEX_SPIN_MAX,
	615	.procname = "spin_max",
	616	.data = &mutex_spin_max,
	617	.maxlen = sizeof(int),
	618	.mode = 0644,
	619	.proc_handler = &proc_dointvec,
	620	},
	621	{0},
	622	};
	623	#endif /* DEBUG_MUTEX */
	624
57d1b188	625	#ifdef DEBUG_KMEM
9ab1ac14	626	static struct ctl_table spl_kmem_table[] = {
57d1b188	627	{
	628	.ctl_name = CTL_KMEM_KMEMUSED,
	629	.procname = "kmem_used",
	630	.data = &kmem_alloc_used,
	631	.maxlen = sizeof(atomic64_t),
	632	.mode = 0444,
	633	.proc_handler = &proc_doatomic64,
	634	},
	635	{
	636	.ctl_name = CTL_KMEM_KMEMMAX,
	637	.procname = "kmem_max",
	638	.data = &kmem_alloc_max,
	639	.maxlen = sizeof(unsigned long),
	640	.extra1 = &table_min,
	641	.extra2 = &table_max,
	642	.mode = 0444,
	643	.proc_handler = &proc_doulongvec_minmax,
	644	},
	645	{
	646	.ctl_name = CTL_KMEM_VMEMUSED,
	647	.procname = "vmem_used",
	648	.data = &vmem_alloc_used,
	649	.maxlen = sizeof(atomic64_t),
	650	.mode = 0444,
	651	.proc_handler = &proc_doatomic64,
	652	},
	653	{
	654	.ctl_name = CTL_KMEM_VMEMMAX,
	655	.procname = "vmem_max",
	656	.data = &vmem_alloc_max,
	657	.maxlen = sizeof(unsigned long),
	658	.extra1 = &table_min,
	659	.extra2 = &table_max,
	660	.mode = 0444,
	661	.proc_handler = &proc_doulongvec_minmax,
	662	},
9ab1ac14	663	{0},
9ab1ac14	664	};
04a479f7	665	#endif /* DEBUG_KMEM */
	666
	667	#ifdef DEBUG_KSTAT
	668	static struct ctl_table spl_kstat_table[] = {
	669	{0},
	670	};
	671	#endif /* DEBUG_KSTAT */
9ab1ac14	672
	673	static struct ctl_table spl_table[] = {
	674	/* NB No .strategy entries have been provided since
	675	* sysctl(8) prefers to go via /proc for portability.
	676	*/
	677	{
	678	.ctl_name = CTL_VERSION,
	679	.procname = "version",
	680	.data = spl_version,
	681	.maxlen = sizeof(spl_version),
	682	.mode = 0444,
	683	.proc_handler = &proc_dostring,
	684	},
57d1b188	685	{
	686	.ctl_name = CTL_HOSTID,
	687	.procname = "hostid",
	688	.data = &spl_hostid,
	689	.maxlen = sizeof(unsigned long),
	690	.mode = 0644,
	691	.proc_handler = &proc_dohostid,
	692	},
	693	{
	694	.ctl_name = CTL_HW_SERIAL,
	695	.procname = "hw_serial",
937879f1	696	.data = hw_serial,
937879f1	697	.maxlen = sizeof(hw_serial),
57d1b188	698	.mode = 0444,
	699	.proc_handler = &proc_dostring,
	700	},
9ab1ac14	701	{
	702	.ctl_name = CTL_SPL_DEBUG,
	703	.procname = "debug",
	704	.mode = 0555,
	705	.child = spl_debug_table,
	706	},
	707	#ifdef DEBUG_MUTEX
	708	{
	709	.ctl_name = CTL_SPL_MUTEX,
	710	.procname = "mutex",
	711	.mode = 0555,
	712	.child = spl_mutex_table,
	713	},
	714	#endif
	715	#ifdef DEBUG_KMEM
	716	{
	717	.ctl_name = CTL_SPL_KMEM,
	718	.procname = "kmem",
	719	.mode = 0555,
	720	.child = spl_kmem_table,
	721	},
04a479f7	722	#endif
	723	#ifdef DEBUG_KSTAT
	724	{
	725	.ctl_name = CTL_SPL_KSTAT,
	726	.procname = "kstat",
	727	.mode = 0555,
	728	.child = spl_kstat_table,
	729	},
9ab1ac14	730	#endif
57d1b188	731	{ 0 },
	732	};
	733
9ab1ac14	734	static struct ctl_table spl_dir[] = {
57d1b188	735	{
	736	.ctl_name = CTL_SPL,
	737	.procname = "spl",
	738	.mode = 0555,
	739	.child = spl_table,
	740	},
	741	{0}
	742	};
	743
404992e3	744	static int
	745	proc_dir_entry_match(int len, const char name, struct proc_dir_entry de)
	746	{
	747	if (de->namelen != len)
	748	return 0;
	749
	750	return !memcmp(name, de->name, len);
	751	}
	752
04a479f7	753	struct proc_dir_entry *
404992e3	754	proc_dir_entry_find(struct proc_dir_entry root, const char str)
	755	{
	756	struct proc_dir_entry *de;
	757
	758	for (de = root->subdir; de; de = de->next)
	759	if (proc_dir_entry_match(strlen(str), str, de))
	760	return de;
	761
	762	return NULL;
	763	}
	764
04a479f7	765	int
	766	proc_dir_entries(struct proc_dir_entry *root)
	767	{
	768	struct proc_dir_entry *de;
	769	int i = 0;
	770
	771	for (de = root->subdir; de; de = de->next)
	772	i++;
	773
	774	return i;
	775	}
	776
57d1b188	777	int
	778	proc_init(void)
	779	{
404992e3	780	int rc = 0;
57d1b188	781	ENTRY;
	782
	783	#ifdef CONFIG_SYSCTL
9ab1ac14	784	spl_header = register_sysctl_table(spl_dir, 0);
57d1b188	785	if (spl_header == NULL)
57d1b188	786	RETURN(-EUNATCH);
9ab1ac14	787
404992e3	788	proc_sys = proc_dir_entry_find(&proc_root, "sys");
	789	if (proc_sys == NULL)
	790	GOTO(out, rc = -EUNATCH);
	791
	792	proc_sys_spl = proc_dir_entry_find(proc_sys, "spl");
	793	if (proc_sys_spl == NULL)
	794	GOTO(out, rc = -EUNATCH);
	795
9ab1ac14	796	#ifdef DEBUG_MUTEX
404992e3	797	proc_sys_spl_mutex = proc_dir_entry_find(proc_sys_spl, "mutex");
	798	if (proc_sys_spl_mutex == NULL)
	799	GOTO(out, rc = -EUNATCH);
	800
	801	proc_sys_spl_mutex_stats = create_proc_entry("stats_per", 0444,
	802	proc_sys_spl_mutex);
	803	if (proc_sys_spl_mutex_stats == NULL)
	804	GOTO(out, rc = -EUNATCH);
	805
	806	proc_sys_spl_mutex_stats->proc_fops = &proc_mutex_operations;
9ab1ac14	807	#endif /* DEBUG_MUTEX */
04a479f7	808
	809	#ifdef DEBUG_KMEM
	810	proc_sys_spl_kmem = proc_dir_entry_find(proc_sys_spl, "kmem");
	811	if (proc_sys_spl_kmem == NULL)
	812	GOTO(out2, rc = -EUNATCH);
	813	#endif /* DEBUG_KMEM */
	814
	815	#ifdef DEBUG_KSTAT
	816	proc_sys_spl_kstat = proc_dir_entry_find(proc_sys_spl, "kstat");
	817	if (proc_sys_spl_kstat == NULL)
	818	GOTO(out2, rc = -EUNATCH);
	819	#endif /* DEBUG_KSTAT */
	820
404992e3	821	RETURN(rc);
04a479f7	822	out2:
04a479f7	823	remove_proc_entry("stats_per", proc_sys_spl_mutex);
404992e3	824	out:
	825	unregister_sysctl_table(spl_header);
	826	#endif /* CONFIG_SYSCTL */
	827	RETURN(rc);
57d1b188	828	}
	829
	830	void
	831	proc_fini(void)
	832	{
	833	ENTRY;
	834
	835	#ifdef CONFIG_SYSCTL
	836	ASSERT(spl_header != NULL);
404992e3	837	remove_proc_entry("stats_per", proc_sys_spl_mutex);
57d1b188	838	unregister_sysctl_table(spl_header);
	839	#endif
	840	EXIT;
	841	}