mips/sgi-ip27/ip27-berr.c

0001 /*
0002  * This file is subject to the terms and conditions of the GNU General Public
0003  * License.  See the file "COPYING" in the main directory of this archive
0004  * for more details.
0005  *
0006  * Copyright (C) 1994, 1995, 1996, 1999, 2000 by Ralf Baechle
0007  * Copyright (C) 1999, 2000 by Silicon Graphics
0008  * Copyright (C) 2002  Maciej W. Rozycki
0009  */
0010 #include <linux/init.h>
0011 #include <linux/kernel.h>
0012 #include <linux/signal.h>   /* for SIGBUS */
0013 #include <linux/sched.h>    /* schow_regs(), force_sig() */
0014 #include <linux/sched/debug.h>
0015 #include <linux/sched/signal.h>
0016
0017 #include <asm/ptrace.h>
0018 #include <asm/sn/addrs.h>
0019 #include <asm/sn/agent.h>
0020 #include <asm/sn/arch.h>
0021 #include <asm/tlbdebug.h>
0022 #include <asm/traps.h>
0023 #include <linux/uaccess.h>
0024
0025 static void dump_hub_information(unsigned long errst0, unsigned long errst1)
0026 {
0027     static char *err_type[2][8] = {
0028         { NULL, "Uncached Partial Read PRERR", "DERR", "Read Timeout",
0029           NULL, NULL, NULL, NULL },
0030         { "WERR", "Uncached Partial Write", "PWERR", "Write Timeout",
0031           NULL, NULL, NULL, NULL }
0032     };
0033     union pi_err_stat0 st0;
0034     union pi_err_stat1 st1;
0035
0036     st0.pi_stat0_word = errst0;
0037     st1.pi_stat1_word = errst1;
0038
0039     if (!st0.pi_stat0_fmt.s0_valid) {
0040         pr_info("Hub does not contain valid error information\n");
0041         return;
0042     }
0043
0044     pr_info("Hub has valid error information:\n");
0045     if (st0.pi_stat0_fmt.s0_ovr_run)
0046         pr_info("Overrun is set. Error stack may contain additional "
0047                "information.\n");
0048     pr_info("Hub error address is %08lx\n",
0049         (unsigned long)st0.pi_stat0_fmt.s0_addr);
0050     pr_info("Incoming message command 0x%lx\n",
0051         (unsigned long)st0.pi_stat0_fmt.s0_cmd);
0052     pr_info("Supplemental field of incoming message is 0x%lx\n",
0053         (unsigned long)st0.pi_stat0_fmt.s0_supl);
0054     pr_info("T5 Rn (for RRB only) is 0x%lx\n",
0055         (unsigned long)st0.pi_stat0_fmt.s0_t5_req);
0056     pr_info("Error type is %s\n", err_type[st1.pi_stat1_fmt.s1_rw_rb]
0057            [st0.pi_stat0_fmt.s0_err_type] ? : "invalid");
0058 }
0059
0060 int ip27_be_handler(struct pt_regs *regs, int is_fixup)
0061 {
0062     unsigned long errst0, errst1;
0063     int data = regs->cp0_cause & 4;
0064     int cpu = LOCAL_HUB_L(PI_CPU_NUM);
0065
0066     if (is_fixup)
0067         return MIPS_BE_FIXUP;
0068
0069     printk("Slice %c got %cbe at 0x%lx\n", 'A' + cpu, data ? 'd' : 'i',
0070            regs->cp0_epc);
0071     printk("Hub information:\n");
0072     printk("ERR_INT_PEND = 0x%06llx\n", LOCAL_HUB_L(PI_ERR_INT_PEND));
0073     errst0 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS0_B : PI_ERR_STATUS0_A);
0074     errst1 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS1_B : PI_ERR_STATUS1_A);
0075     dump_hub_information(errst0, errst1);
0076     show_regs(regs);
0077     dump_tlb_all();
0078     while(1);
0079     force_sig(SIGBUS);
0080 }
0081
0082 void __init ip27_be_init(void)
0083 {
0084     /* XXX Initialize all the Hub & Bridge error handling here.  */
0085     int cpu = LOCAL_HUB_L(PI_CPU_NUM);
0086     int cpuoff = cpu << 8;
0087
0088     mips_set_be_handler(ip27_be_handler);
0089
0090     LOCAL_HUB_S(PI_ERR_INT_PEND,
0091             cpu ? PI_ERR_CLEAR_ALL_B : PI_ERR_CLEAR_ALL_A);
0092     LOCAL_HUB_S(PI_ERR_INT_MASK_A + cpuoff, 0);
0093     LOCAL_HUB_S(PI_ERR_STACK_ADDR_A + cpuoff, 0);
0094     LOCAL_HUB_S(PI_ERR_STACK_SIZE, 0);  /* Disable error stack */
0095     LOCAL_HUB_S(PI_SYSAD_ERRCHK_EN, PI_SYSAD_CHECK_ALL);
0096 }