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d61e12af5a
think this should fix anything but it's a good idea regardless. - Drop the lock before calling the construct/destructor for the slab otherwise we can't sleep in a constructor/destructor and for long running functions we may NMI. - Do something braindead, but safe for the console debug logs for now. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@73 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
405 lines
10 KiB
C
405 lines
10 KiB
C
#include <sys/sysmacros.h>
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#include <sys/vmsystm.h>
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#include <sys/vnode.h>
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#include <sys/kmem.h>
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#include <sys/debug.h>
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#include <linux/proc_fs.h>
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#include <linux/kmod.h>
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#include "config.h"
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/*
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* Generic support
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*/
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static char spl_debug_buffer1[1024];
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static char spl_debug_buffer2[1024];
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static spinlock_t spl_debug_lock = SPIN_LOCK_UNLOCKED;
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unsigned long spl_debug_mask = 0;
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unsigned long spl_debug_subsys = 0xff;
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unsigned long spl_hostid = 0;
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char hw_serial[11] = "<none>";
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EXPORT_SYMBOL(spl_debug_mask);
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EXPORT_SYMBOL(spl_debug_subsys);
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EXPORT_SYMBOL(spl_hostid);
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EXPORT_SYMBOL(hw_serial);
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static struct proc_dir_entry *spl_proc_root = NULL;
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static struct proc_dir_entry *spl_proc_debug_mask = NULL;
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static struct proc_dir_entry *spl_proc_debug_subsys = NULL;
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static struct proc_dir_entry *spl_proc_hostid = NULL;
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static struct proc_dir_entry *spl_proc_hw_serial = NULL;
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int p0 = 0;
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EXPORT_SYMBOL(p0);
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vmem_t *zio_alloc_arena = NULL;
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EXPORT_SYMBOL(zio_alloc_arena);
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int
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highbit(unsigned long i)
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{
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register int h = 1;
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if (i == 0)
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return (0);
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#if BITS_PER_LONG == 64
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if (i & 0xffffffff00000000ul) {
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h += 32; i >>= 32;
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}
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#endif
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if (i & 0xffff0000) {
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h += 16; i >>= 16;
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}
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if (i & 0xff00) {
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h += 8; i >>= 8;
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}
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if (i & 0xf0) {
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h += 4; i >>= 4;
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}
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if (i & 0xc) {
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h += 2; i >>= 2;
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}
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if (i & 0x2) {
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h += 1;
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}
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return (h);
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}
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EXPORT_SYMBOL(highbit);
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int
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ddi_strtoul(const char *str, char **nptr, int base, unsigned long *result)
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{
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char *end;
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return (*result = simple_strtoul(str, &end, base));
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}
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EXPORT_SYMBOL(ddi_strtoul);
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/* XXX: Not the most efficient debug function ever. This should be re-done
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* as an internal per-cpu in-memory debug log accessable via /proc/. Not as
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* a shared global buffer everything gets serialize though. That said I'll
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* worry about performance considerations once I've dealt with correctness.
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*/
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void
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__dprintf(const char *file, const char *func, int line, const char *fmt, ...)
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{
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char *sfp;
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struct timeval tv;
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unsigned long flags;
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va_list ap;
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sfp = strrchr(file, '/');
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do_gettimeofday(&tv);
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/* XXX: This is particularly bad for performance, but we need to
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* disable irqs here or two __dprintf()'s may deadlock on each
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* other if one if called from an irq handler. This is yet another
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* reason why we really, really, need an internal debug log.
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*/
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spin_lock_irqsave(&spl_debug_lock, flags);
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memset(spl_debug_buffer1, 0, 1024);
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memset(spl_debug_buffer2, 0, 1024);
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snprintf(spl_debug_buffer1, 1023,
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"spl: %lu.%06lu:%d:%u:%s:%d:%s(): ",
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tv.tv_sec, tv.tv_usec, current->pid,
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smp_processor_id(),
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sfp == NULL ? file : sfp + 1,
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line, func);
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va_start(ap, fmt);
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vsnprintf(spl_debug_buffer2, 1023, fmt, ap);
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va_end(ap);
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printk("%s%s", spl_debug_buffer1, spl_debug_buffer2);
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spin_unlock_irqrestore(&spl_debug_lock, flags);
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}
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EXPORT_SYMBOL(__dprintf);
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static int
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spl_proc_rd_generic_ul(char *page, char **start, off_t off,
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int count, int *eof, unsigned long val)
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{
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*start = page;
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*eof = 1;
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if (off || count > PAGE_SIZE)
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return 0;
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return snprintf(page, PAGE_SIZE, "0x%lx\n", val & 0xffffffff);
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}
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static int
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spl_proc_rd_debug_mask(char *page, char **start, off_t off,
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int count, int *eof, void *data)
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{
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int rc;
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spin_lock(&spl_debug_lock);
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rc = spl_proc_rd_generic_ul(page, start, off, count,
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eof, spl_debug_mask);
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spin_unlock(&spl_debug_lock);
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return rc;
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}
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static int
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spl_proc_rd_debug_subsys(char *page, char **start, off_t off,
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int count, int *eof, void *data)
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{
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int rc;
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spin_lock(&spl_debug_lock);
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rc = spl_proc_rd_generic_ul(page, start, off, count,
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eof, spl_debug_subsys);
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spin_unlock(&spl_debug_lock);
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return rc;
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}
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static int
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spl_proc_rd_hostid(char *page, char **start, off_t off,
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int count, int *eof, void *data)
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{
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*start = page;
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*eof = 1;
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if (off || count > PAGE_SIZE)
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return 0;
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return snprintf(page, PAGE_SIZE, "%lx\n", spl_hostid & 0xffffffff);
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}
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static int
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spl_proc_rd_hw_serial(char *page, char **start, off_t off,
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int count, int *eof, void *data)
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{
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*start = page;
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*eof = 1;
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if (off || count > PAGE_SIZE)
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return 0;
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strncpy(page, hw_serial, 11);
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return strlen(page);
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}
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static int
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spl_proc_wr_generic_ul(const char *ubuf, unsigned long count,
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unsigned long *val, int base)
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{
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char *end, kbuf[32];
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if (count >= sizeof(kbuf))
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return -EOVERFLOW;
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if (copy_from_user(kbuf, ubuf, count))
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return -EFAULT;
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kbuf[count] = '\0';
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*val = (int)simple_strtoul(kbuf, &end, base);
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if (kbuf == end)
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return -EINVAL;
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return 0;
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}
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static int
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spl_proc_wr_debug_mask(struct file *file, const char *ubuf,
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unsigned long count, void *data, int mode)
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{
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unsigned long val;
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int rc;
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rc = spl_proc_wr_generic_ul(ubuf, count, &val, 16);
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if (rc)
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return rc;
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spin_lock(&spl_debug_lock);
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spl_debug_mask = val;
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spin_unlock(&spl_debug_lock);
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return count;
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}
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static int
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spl_proc_wr_debug_subsys(struct file *file, const char *ubuf,
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unsigned long count, void *data, int mode)
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{
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unsigned long val;
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int rc;
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rc = spl_proc_wr_generic_ul(ubuf, count, &val, 16);
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if (rc)
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return rc;
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spin_lock(&spl_debug_lock);
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spl_debug_subsys = val;
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spin_unlock(&spl_debug_lock);
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return count;
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}
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static int
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spl_proc_wr_hostid(struct file *file, const char *ubuf,
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unsigned long count, void *data, int mode)
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{
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unsigned long val;
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int rc;
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rc = spl_proc_wr_generic_ul(ubuf, count, &val, 16);
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if (rc)
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return rc;
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spl_hostid = val;
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sprintf(hw_serial, "%lu\n", ((long)val >= 0) ? val : -val);
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return count;
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}
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static struct proc_dir_entry *
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spl_register_proc_entry(const char *name, mode_t mode,
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struct proc_dir_entry *parent, void *data,
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void *read_proc, void *write_proc)
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{
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struct proc_dir_entry *entry;
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entry = create_proc_entry(name, mode, parent);
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if (!entry)
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return ERR_PTR(-EINVAL);
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entry->data = data;
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entry->read_proc = read_proc;
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entry->write_proc = write_proc;
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return entry;
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} /* register_proc_entry() */
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void spl_set_debug_mask(unsigned long mask) {
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spin_lock(&spl_debug_lock);
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spl_debug_mask = mask;
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spin_unlock(&spl_debug_lock);
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}
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EXPORT_SYMBOL(spl_set_debug_mask);
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void spl_set_debug_subsys(unsigned long mask) {
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spin_lock(&spl_debug_lock);
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spl_debug_subsys = mask;
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spin_unlock(&spl_debug_lock);
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}
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EXPORT_SYMBOL(spl_set_debug_subsys);
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static int __init spl_init(void)
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{
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int rc = 0;
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char sh_path[] = "/bin/sh";
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char *argv[] = { sh_path,
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"-c",
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"/usr/bin/hostid >/proc/spl/hostid",
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NULL };
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char *envp[] = { "HOME=/",
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"TERM=linux",
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"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
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NULL };
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spl_proc_root = proc_mkdir("spl", NULL);
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if (!spl_proc_root) {
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printk("spl: Error unable to create /proc/spl/ directory\n");
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return -EINVAL;
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}
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spl_proc_debug_mask = spl_register_proc_entry("debug_mask", 0644,
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spl_proc_root, NULL,
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spl_proc_rd_debug_mask,
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spl_proc_wr_debug_mask);
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if (IS_ERR(spl_proc_debug_mask)) {
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rc = PTR_ERR(spl_proc_debug_mask);
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goto out;
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}
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spl_proc_debug_subsys = spl_register_proc_entry("debug_subsys", 0644,
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spl_proc_root, NULL,
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spl_proc_rd_debug_subsys,
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spl_proc_wr_debug_subsys);
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if (IS_ERR(spl_proc_debug_subsys)) {
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rc = PTR_ERR(spl_proc_debug_subsys);
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goto out2;
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}
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spl_proc_hostid = spl_register_proc_entry("hostid", 0644,
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spl_proc_root, NULL,
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spl_proc_rd_hostid,
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spl_proc_wr_hostid);
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if (IS_ERR(spl_proc_hostid)) {
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rc = PTR_ERR(spl_proc_hostid);
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goto out3;
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}
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spl_proc_hw_serial = spl_register_proc_entry("hw_serial", 0444,
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spl_proc_root, NULL,
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spl_proc_rd_hw_serial,
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NULL);
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if (IS_ERR(spl_proc_hw_serial)) {
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rc = PTR_ERR(spl_proc_hw_serial);
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goto out4;
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}
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if ((rc = kmem_init()))
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goto out4;
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if ((rc = vn_init()))
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goto out4;
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/* Doing address resolution in the kernel is tricky and just
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* not a good idea in general. So to set the proper 'hw_serial'
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* use the usermodehelper support to ask '/bin/sh' to run
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* '/usr/bin/hostid' and redirect the result to /proc/spl/hostid
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* for us to use. It's a horific solution but it will do.
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*/
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if ((rc = call_usermodehelper(sh_path, argv, envp, 1)))
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goto out4;
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printk("spl: Loaded Solaris Porting Layer v%s\n", VERSION);
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return 0;
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out4:
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if (spl_proc_hw_serial)
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remove_proc_entry("hw_serial", spl_proc_root);
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out3:
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if (spl_proc_hostid)
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remove_proc_entry("hostid", spl_proc_root);
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out2:
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if (spl_proc_debug_mask)
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remove_proc_entry("debug_mask", spl_proc_root);
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if (spl_proc_debug_subsys)
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remove_proc_entry("debug_subsys", spl_proc_root);
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out:
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remove_proc_entry("spl", NULL);
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return rc;
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}
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static void spl_fini(void)
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{
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vn_fini();
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kmem_fini();
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remove_proc_entry("hw_serial", spl_proc_root);
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remove_proc_entry("hostid", spl_proc_root);
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remove_proc_entry("debug_subsys", spl_proc_root);
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remove_proc_entry("debug_mask", spl_proc_root);
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remove_proc_entry("spl", NULL);
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return;
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}
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module_init(spl_init);
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module_exit(spl_fini);
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MODULE_AUTHOR("Lawrence Livermore National Labs");
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MODULE_DESCRIPTION("Solaris Porting Layer");
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MODULE_LICENSE("GPL");
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