Viewing file:  ip27-berr.c (4.77 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1994, 1995, 1996, 1999, 2000 by Ralf Baechle
* Copyright (C) 1999, 2000 by Silicon Graphics
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/module.h>
#include <asm/sn/addrs.h>
#include <asm/sn/arch.h>
#include <asm/sn/sn0/hub.h>
#include <asm/uaccess.h>
extern void dump_tlb_addr(unsigned long addr);
extern void dump_tlb_all(void);
extern asmlinkage void handle_ibe(void);
extern asmlinkage void handle_dbe(void);
extern const struct exception_table_entry __start___dbe_table[];
extern const struct exception_table_entry __stop___dbe_table[];
static inline unsigned long
search_one_table(const struct exception_table_entry *first,
const struct exception_table_entry *last,
unsigned long value)
{
while (first <= last) {
const struct exception_table_entry *mid;
long diff;
mid = (last - first) / 2 + first;
diff = mid->insn - value;
if (diff == 0)
return mid->nextinsn;
else if (diff < 0)
first = mid+1;
else
last = mid-1;
}
return 0;
}
extern spinlock_t modlist_lock;
static inline unsigned long
search_dbe_table(unsigned long addr)
{
unsigned long ret;
#ifndef CONFIG_MODULES
/* There is only the kernel to search. */
ret = search_one_table(__start___dbe_table, __stop___dbe_table-1, addr);
return ret;
#else
unsigned long flags;
/* The kernel is the last "module" -- no need to treat it special. */
struct module *mp;
struct archdata *ap;
spin_lock_irqsave(&modlist_lock, flags);
for (mp = module_list; mp != NULL; mp = mp->next) {
if (!mod_member_present(mp, archdata_end) ||
!mod_archdata_member_present(mp, struct archdata,
dbe_table_end))
continue;
ap = (struct archdata *)(mod->archdata_start);
if (ap->dbe_table_start == NULL ||
!(mp->flags & (MOD_RUNNING | MOD_INITIALIZING)))
continue;
ret = search_one_table(ap->dbe_table_start,
ap->dbe_table_end - 1, addr);
if (ret)
break;
}
spin_unlock_irqrestore(&modlist_lock, flags);
return ret;
#endif
}
void do_ibe(struct pt_regs *regs)
{
printk("Got ibe at 0x%lx\n", regs->cp0_epc);
show_regs(regs);
dump_tlb_addr(regs->cp0_epc);
force_sig(SIGBUS, current);
while(1);
}
static void dump_hub_information(unsigned long errst0, unsigned long errst1)
{
static char *err_type[2][8] = {
{ NULL, "Uncached Partial Read PRERR", "DERR", "Read Timeout",
NULL, NULL, NULL, NULL },
{ "WERR", "Uncached Partial Write", "PWERR", "Write Timeout",
NULL, NULL, NULL, NULL }
};
int wrb = errst1 & PI_ERR_ST1_WRBRRB_MASK;
if (!(errst0 & PI_ERR_ST0_VALID_MASK)) {
printk("Hub does not contain valid error information\n");
return;
}
printk("Hub has valid error information:\n");
if (errst0 & PI_ERR_ST0_OVERRUN_MASK)
printk("Overrun is set. Error stack may contain additional "
"information.\n");
printk("Hub error address is %08lx\n",
(errst0 & PI_ERR_ST0_ADDR_MASK) >> (PI_ERR_ST0_ADDR_SHFT - 3));
printk("Incoming message command 0x%lx\n",
(errst0 & PI_ERR_ST0_CMD_MASK) >> PI_ERR_ST0_CMD_SHFT);
printk("Supplemental field of incoming message is 0x%lx\n",
(errst0 & PI_ERR_ST0_SUPPL_MASK) >> PI_ERR_ST0_SUPPL_SHFT);
printk("T5 Rn (for RRB only) is 0x%lx\n",
(errst0 & PI_ERR_ST0_REQNUM_MASK) >> PI_ERR_ST0_REQNUM_SHFT);
printk("Error type is %s\n", err_type[wrb]
[(errst0 & PI_ERR_ST0_TYPE_MASK) >> PI_ERR_ST0_TYPE_SHFT]
? : "invalid");
}
void do_dbe(struct pt_regs *regs)
{
unsigned long fixup, errst0, errst1;
int cpu = LOCAL_HUB_L(PI_CPU_NUM);
fixup = search_dbe_table(regs->cp0_epc);
if (fixup) {
long new_epc;
new_epc = fixup_exception(dpf_reg, fixup, regs->cp0_epc);
regs->cp0_epc = new_epc;
return;
}
printk("Slice %c got dbe at 0x%lx\n", 'A' + cpu, regs->cp0_epc);
printk("Hub information:\n");
printk("ERR_INT_PEND = 0x%06lx\n", LOCAL_HUB_L(PI_ERR_INT_PEND));
errst0 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS0_B : PI_ERR_STATUS0_A);
errst1 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS1_B : PI_ERR_STATUS1_A);
dump_hub_information(errst0, errst1);
show_regs(regs);
dump_tlb_all();
while(1);
force_sig(SIGBUS, current);
}
void __init
bus_error_init(void)
{
/* XXX Initialize all the Hub & Bridge error handling here. */
int cpu = LOCAL_HUB_L(PI_CPU_NUM);
int cpuoff = cpu << 8;
set_except_vector(6, handle_ibe);
set_except_vector(7, handle_dbe);
LOCAL_HUB_S(PI_ERR_INT_PEND,
cpu ? PI_ERR_CLEAR_ALL_B : PI_ERR_CLEAR_ALL_A);
LOCAL_HUB_S(PI_ERR_INT_MASK_A + cpuoff, 0);
LOCAL_HUB_S(PI_ERR_STACK_ADDR_A + cpuoff, 0);
LOCAL_HUB_S(PI_ERR_STACK_SIZE, 0); /* Disable error stack */
LOCAL_HUB_S(PI_SYSAD_ERRCHK_EN, PI_SYSAD_CHECK_ALL);
}
|