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-rw-r--r--arch/mips/sgi-ip27/ip27-berr.c96
1 files changed, 96 insertions, 0 deletions
diff --git a/arch/mips/sgi-ip27/ip27-berr.c b/arch/mips/sgi-ip27/ip27-berr.c
new file mode 100644
index 0000000000..923a63a51c
--- /dev/null
+++ b/arch/mips/sgi-ip27/ip27-berr.c
@@ -0,0 +1,96 @@
+/*
+ * 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
+ * Copyright (C) 2002 Maciej W. Rozycki
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/signal.h> /* for SIGBUS */
+#include <linux/sched.h> /* schow_regs(), force_sig() */
+#include <linux/sched/debug.h>
+#include <linux/sched/signal.h>
+
+#include <asm/ptrace.h>
+#include <asm/sn/addrs.h>
+#include <asm/sn/agent.h>
+#include <asm/sn/arch.h>
+#include <asm/tlbdebug.h>
+#include <asm/traps.h>
+#include <linux/uaccess.h>
+
+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 }
+ };
+ union pi_err_stat0 st0;
+ union pi_err_stat1 st1;
+
+ st0.pi_stat0_word = errst0;
+ st1.pi_stat1_word = errst1;
+
+ if (!st0.pi_stat0_fmt.s0_valid) {
+ pr_info("Hub does not contain valid error information\n");
+ return;
+ }
+
+ pr_info("Hub has valid error information:\n");
+ if (st0.pi_stat0_fmt.s0_ovr_run)
+ pr_info("Overrun is set. Error stack may contain additional "
+ "information.\n");
+ pr_info("Hub error address is %08lx\n",
+ (unsigned long)st0.pi_stat0_fmt.s0_addr);
+ pr_info("Incoming message command 0x%lx\n",
+ (unsigned long)st0.pi_stat0_fmt.s0_cmd);
+ pr_info("Supplemental field of incoming message is 0x%lx\n",
+ (unsigned long)st0.pi_stat0_fmt.s0_supl);
+ pr_info("T5 Rn (for RRB only) is 0x%lx\n",
+ (unsigned long)st0.pi_stat0_fmt.s0_t5_req);
+ pr_info("Error type is %s\n", err_type[st1.pi_stat1_fmt.s1_rw_rb]
+ [st0.pi_stat0_fmt.s0_err_type] ? : "invalid");
+}
+
+int ip27_be_handler(struct pt_regs *regs, int is_fixup)
+{
+ unsigned long errst0, errst1;
+ int data = regs->cp0_cause & 4;
+ int cpu = LOCAL_HUB_L(PI_CPU_NUM);
+
+ if (is_fixup)
+ return MIPS_BE_FIXUP;
+
+ printk("Slice %c got %cbe at 0x%lx\n", 'A' + cpu, data ? 'd' : 'i',
+ regs->cp0_epc);
+ printk("Hub information:\n");
+ printk("ERR_INT_PEND = 0x%06llx\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);
+}
+
+void __init ip27_be_init(void)
+{
+ /* XXX Initialize all the Hub & Bridge error handling here. */
+ int cpu = LOCAL_HUB_L(PI_CPU_NUM);
+ int cpuoff = cpu << 8;
+
+ mips_set_be_handler(ip27_be_handler);
+
+ 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);
+}