machine_check.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 */
  4
  5#include <linux/kernel.h>
  6#include <linux/printk.h>
  7#include <linux/ptrace.h>
  8
  9#include <asm/reg.h>
 10#include <asm/cacheflush.h>
 11
 12int machine_check_4xx(struct pt_regs *regs)
 13{
 14	unsigned long reason = regs->esr;
 15
 16	if (reason & ESR_IMCP) {
 17		printk("Instruction");
 18		mtspr(SPRN_ESR, reason & ~ESR_IMCP);
 19	} else
 20		printk("Data");
 21
 22	printk(" machine check in kernel mode.\n");
 23
 24	return 0;
 25}
 26
 27int machine_check_440A(struct pt_regs *regs)
 28{
 29	unsigned long reason = regs->esr;
 30
 31	printk("Machine check in kernel mode.\n");
 32	if (reason & ESR_IMCP){
 33		printk("Instruction Synchronous Machine Check exception\n");
 34		mtspr(SPRN_ESR, reason & ~ESR_IMCP);
 35	}
 36	else {
 37		u32 mcsr = mfspr(SPRN_MCSR);
 38		if (mcsr & MCSR_IB)
 39			printk("Instruction Read PLB Error\n");
 40		if (mcsr & MCSR_DRB)
 41			printk("Data Read PLB Error\n");
 42		if (mcsr & MCSR_DWB)
 43			printk("Data Write PLB Error\n");
 44		if (mcsr & MCSR_TLBP)
 45			printk("TLB Parity Error\n");
 46		if (mcsr & MCSR_ICP){
 47			flush_instruction_cache();
 48			printk("I-Cache Parity Error\n");
 49		}
 50		if (mcsr & MCSR_DCSP)
 51			printk("D-Cache Search Parity Error\n");
 52		if (mcsr & MCSR_DCFP)
 53			printk("D-Cache Flush Parity Error\n");
 54		if (mcsr & MCSR_IMPE)
 55			printk("Machine Check exception is imprecise\n");
 56
 57		/* Clear MCSR */
 58		mtspr(SPRN_MCSR, mcsr);
 59	}
 60	return 0;
 61}
 62
 63#ifdef CONFIG_PPC_47x
 64int machine_check_47x(struct pt_regs *regs)
 65{
 66	unsigned long reason = regs->esr;
 67	u32 mcsr;
 68
 69	printk(KERN_ERR "Machine check in kernel mode.\n");
 70	if (reason & ESR_IMCP) {
 71		printk(KERN_ERR "Instruction Synchronous Machine Check exception\n");
 72		mtspr(SPRN_ESR, reason & ~ESR_IMCP);
 73		return 0;
 74	}
 75	mcsr = mfspr(SPRN_MCSR);
 76	if (mcsr & MCSR_IB)
 77		printk(KERN_ERR "Instruction Read PLB Error\n");
 78	if (mcsr & MCSR_DRB)
 79		printk(KERN_ERR "Data Read PLB Error\n");
 80	if (mcsr & MCSR_DWB)
 81		printk(KERN_ERR "Data Write PLB Error\n");
 82	if (mcsr & MCSR_TLBP)
 83		printk(KERN_ERR "TLB Parity Error\n");
 84	if (mcsr & MCSR_ICP) {
 85		flush_instruction_cache();
 86		printk(KERN_ERR "I-Cache Parity Error\n");
 87	}
 88	if (mcsr & MCSR_DCSP)
 89		printk(KERN_ERR "D-Cache Search Parity Error\n");
 90	if (mcsr & PPC47x_MCSR_GPR)
 91		printk(KERN_ERR "GPR Parity Error\n");
 92	if (mcsr & PPC47x_MCSR_FPR)
 93		printk(KERN_ERR "FPR Parity Error\n");
 94	if (mcsr & PPC47x_MCSR_IPR)
 95		printk(KERN_ERR "Machine Check exception is imprecise\n");
 96
 97	/* Clear MCSR */
 98	mtspr(SPRN_MCSR, mcsr);
 99
100	return 0;
101}
102#endif /* CONFIG_PPC_47x */