13fe24f37d
http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=3719 When the CPLBs get a miss, we do: - find a victim in the HW table - remove the victim - find the replacement in the software table - put it into the HW table. If we can't find a replacement in the software table, we accidently leave a duplicate in the HW table. This patch ensures that duplicate is marked as not valid. What we should do is find the replacement in the software table, before we find a victim in the HW table - but its too late in the release cycle to do that much restructuring of this code. Rather that duplicate code, connect Hardware Errors (irq5) into trap_c, so user space processes get killed properly. The rest of irq_panic() can be moved into traps.c (later) There is still a small corner case that causes problems when a pheriperal interrupt goes off a single cycle before a user space hardware error. This causes a kernel panic, rather than the user space process being killed. But, this checkin makes things work in 99.9% of the cases, and is a vast improvement from what is there today (which fails 100% of the time). Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
147 lines
4.2 KiB
C
147 lines
4.2 KiB
C
/*
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* File: arch/blackfin/mach-common/irqpanic.c
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* Based on:
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* Author:
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*
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* Created: ?
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* Description: panic kernel with dump information
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*
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* Modified: rgetz - added cache checking code 14Feb06
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* Copyright 2004-2006 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/module.h>
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#include <linux/kernel_stat.h>
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#include <linux/sched.h>
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#include <asm/traps.h>
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#include <asm/blackfin.h>
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#include "../oprofile/op_blackfin.h"
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#ifdef CONFIG_DEBUG_ICACHE_CHECK
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#define L1_ICACHE_START 0xffa10000
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#define L1_ICACHE_END 0xffa13fff
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void irq_panic(int reason, struct pt_regs *regs) __attribute__ ((l1_text));
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#endif
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/*
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* irq_panic - calls panic with string setup
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*/
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asmlinkage void irq_panic(int reason, struct pt_regs *regs)
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{
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#ifdef CONFIG_DEBUG_ICACHE_CHECK
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unsigned int cmd, tag, ca, cache_hi, cache_lo, *pa;
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unsigned short i, j, die;
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unsigned int bad[10][6];
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/* check entire cache for coherency
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* Since printk is in cacheable memory,
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* don't call it until you have checked everything
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*/
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die = 0;
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i = 0;
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/* check icache */
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for (ca = L1_ICACHE_START; ca <= L1_ICACHE_END && i < 10; ca += 32) {
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/* Grab various address bits for the itest_cmd fields */
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cmd = (((ca & 0x3000) << 4) | /* ca[13:12] for SBNK[1:0] */
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((ca & 0x0c00) << 16) | /* ca[11:10] for WAYSEL[1:0] */
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((ca & 0x3f8)) | /* ca[09:03] for SET[4:0] and DW[1:0] */
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0); /* Access Tag, Read access */
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SSYNC();
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bfin_write_ITEST_COMMAND(cmd);
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SSYNC();
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tag = bfin_read_ITEST_DATA0();
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SSYNC();
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/* if tag is marked as valid, check it */
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if (tag & 1) {
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/* The icache is arranged in 4 groups of 64-bits */
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for (j = 0; j < 32; j += 8) {
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cmd = ((((ca + j) & 0x3000) << 4) | /* ca[13:12] for SBNK[1:0] */
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(((ca + j) & 0x0c00) << 16) | /* ca[11:10] for WAYSEL[1:0] */
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(((ca + j) & 0x3f8)) | /* ca[09:03] for SET[4:0] and DW[1:0] */
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4); /* Access Data, Read access */
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SSYNC();
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bfin_write_ITEST_COMMAND(cmd);
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SSYNC();
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cache_hi = bfin_read_ITEST_DATA1();
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cache_lo = bfin_read_ITEST_DATA0();
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pa = ((unsigned int *)((tag & 0xffffcc00) |
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((ca + j) & ~(0xffffcc00))));
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/*
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* Debugging this, enable
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*
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* printk("addr: %08x %08x%08x | %08x%08x\n",
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* ((unsigned int *)((tag & 0xffffcc00) | ((ca+j) & ~(0xffffcc00)))),
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* cache_hi, cache_lo, *(pa+1), *pa);
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*/
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if (cache_hi != *(pa + 1) || cache_lo != *pa) {
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/* Since icache is not working, stay out of it, by not printing */
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die = 1;
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bad[i][0] = (ca + j);
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bad[i][1] = cache_hi;
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bad[i][2] = cache_lo;
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bad[i][3] = ((tag & 0xffffcc00) |
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((ca + j) & ~(0xffffcc00)));
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bad[i][4] = *(pa + 1);
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bad[i][5] = *(pa);
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i++;
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}
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}
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}
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}
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if (die) {
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printk(KERN_EMERG "icache coherency error\n");
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for (j = 0; j <= i; j++) {
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printk(KERN_EMERG
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"cache address : %08x cache value : %08x%08x\n",
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bad[j][0], bad[j][1], bad[j][2]);
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printk(KERN_EMERG
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"physical address: %08x SDRAM value : %08x%08x\n",
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bad[j][3], bad[j][4], bad[j][5]);
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}
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panic("icache coherency error");
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} else {
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printk(KERN_EMERG "icache checked, and OK\n");
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}
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#endif
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}
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#ifdef CONFIG_HARDWARE_PM
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/*
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* call the handler of Performance overflow
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*/
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asmlinkage void pm_overflow(int irq, struct pt_regs *regs)
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{
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pm_overflow_handler(irq, regs);
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}
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#endif
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