mca_drv.c

linux 内核源代码

/*
 * File:	mca_drv.c
 * Purpose:	Generic MCA handling layer
 *
 * Copyright (C) 2004 FUJITSU LIMITED
 * Copyright (C) Hidetoshi Seto ([e-mail])
 * Copyright (C) 2005 Silicon Graphics, Inc
 * Copyright (C) 2005 Keith Owens <[e-mail]>
 * Copyright (C) 2006 Russ Anderson <[e-mail]>
 */
#include <linux/types.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kallsyms.h>
#include <linux/bootmem.h>
#include <linux/acpi.h>
#include <linux/timer.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/smp.h>
#include <linux/workqueue.h>
#include <linux/mm.h>

#include <asm/delay.h>
#include <asm/machvec.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/sal.h>
#include <asm/mca.h>

#include <asm/irq.h>
#include <asm/hw_irq.h>

#include "mca_drv.h"

/* max size of SAL error record (default) */
static int sal_rec_max = 10000;

/* from mca_drv_asm.S */
extern void *mca_handler_bhhook(void);

static DEFINE_SPINLOCK(mca_bh_lock);

typedef enum {
	MCA_IS_LOCAL  = 0,
	MCA_IS_GLOBAL = 1
} mca_type_t;

#define MAX_PAGE_ISOLATE 1024

static struct page *page_isolate[MAX_PAGE_ISOLATE];
static int num_page_isolate = 0;

typedef enum {
	ISOLATE_NG,
	ISOLATE_OK,
	ISOLATE_NONE
} isolate_status_t;

typedef enum {
	MCA_NOT_RECOVERED = 0,
	MCA_RECOVERED	  = 1
} recovery_status_t;

/*
 *  This pool keeps pointers to the section part of SAL error record
 */
static struct {
	slidx_list_t *buffer; /* section pointer list pool */
	int	     cur_idx; /* Current index of section pointer list pool */
	int	     max_idx; /* Maximum index of section pointer list pool */
} slidx_pool;

static int
fatal_mca(const char *fmt, ...)
{
	va_list args;
	char buf[256];

	va_start(args, fmt);
	vsnprintf(buf, sizeof(buf), fmt, args);
	va_end(args);
	ia64_mca_printk(KERN_ALERT "MCA: %s\n", buf);

	return MCA_NOT_RECOVERED;
}

static int
mca_recovered(const char *fmt, ...)
{
	va_list args;
	char buf[256];

	va_start(args, fmt);
	vsnprintf(buf, sizeof(buf), fmt, args);
	va_end(args);
	ia64_mca_printk(KERN_INFO "MCA: %s\n", buf);

	return MCA_RECOVERED;
}

/**
 * mca_page_isolate - isolate a poisoned page in order not to use it later
 * @paddr:	poisoned memory location
 *
 * Return value:
 *	one of isolate_status_t, ISOLATE_OK/NG/NONE.
 */

static isolate_status_t
mca_page_isolate(unsigned long paddr)
{
	int i;
	struct page *p;

	/* whether physical address is valid or not */
	if (!ia64_phys_addr_valid(paddr))
		return ISOLATE_NONE;

	if (!pfn_valid(paddr >> PAGE_SHIFT))
		return ISOLATE_NONE;

	/* convert physical address to physical page number */
	p = pfn_to_page(paddr>>PAGE_SHIFT);

	/* check whether a page number have been already registered or not */
	for (i = 0; i < num_page_isolate; i++)
		if (page_isolate[i] == p)
			return ISOLATE_OK; /* already listed */

	/* limitation check */
	if (num_page_isolate == MAX_PAGE_ISOLATE)
		return ISOLATE_NG;

	/* kick pages having attribute 'SLAB' or 'Reserved' */
	if (PageSlab(p) || PageReserved(p))
		return ISOLATE_NG;

	/* add attribute 'Reserved' and register the page */
	get_page(p);
	SetPageReserved(p);
	page_isolate[num_page_isolate++] = p;

	return ISOLATE_OK;
}

/**
 * mca_hanlder_bh - Kill the process which occurred memory read error
 * @paddr:	poisoned address received from MCA Handler
 */

void
mca_handler_bh(unsigned long paddr, void *iip, unsigned long ipsr)
{
	ia64_mlogbuf_dump();
	printk(KERN_ERR "OS_MCA: process [cpu %d, pid: %d, uid: %d, "
		"iip: %p, psr: 0x%lx,paddr: 0x%lx](%s) encounters MCA.\n",
		raw_smp_processor_id(), current->pid, current->uid,
		iip, ipsr, paddr, current->comm);

	spin_lock(&mca_bh_lock);
	switch (mca_page_isolate(paddr)) {
	case ISOLATE_OK:
		printk(KERN_DEBUG "Page isolation: ( %lx ) success.\n", paddr);
		break;
	case ISOLATE_NG:
		printk(KERN_CRIT "Page isolation: ( %lx ) failure.\n", paddr);
		break;
	default:
		break;
	}
	spin_unlock(&mca_bh_lock);

	/* This process is about to be killed itself */
	do_exit(SIGKILL);
}

/**
 * mca_make_peidx - Make index of processor error section
 * @slpi:	pointer to record of processor error section
 * @peidx:	pointer to index of processor error section
 */

static void
mca_make_peidx(sal_log_processor_info_t *slpi, peidx_table_t *peidx)
{
	/*
	 * calculate the start address of
	 *   "struct cpuid_info" and "sal_processor_static_info_t".
	 */
	u64 total_check_num = slpi->valid.num_cache_check
				+ slpi->valid.num_tlb_check
				+ slpi->valid.num_bus_check
				+ slpi->valid.num_reg_file_check
				+ slpi->valid.num_ms_check;
	u64 head_size =	sizeof(sal_log_mod_error_info_t) * total_check_num
			+ sizeof(sal_log_processor_info_t);
	u64 mid_size  = slpi->valid.cpuid_info * sizeof(struct sal_cpuid_info);

	peidx_head(peidx)   = slpi;
	peidx_mid(peidx)    = (struct sal_cpuid_info *)
		(slpi->valid.cpuid_info ? ((char*)slpi + head_size) : NULL);
	peidx_bottom(peidx) = (sal_processor_static_info_t *)
		(slpi->valid.psi_static_struct ?
			((char*)slpi + head_size + mid_size) : NULL);
}

/**
 * mca_make_slidx -  Make index of SAL error record
 * @buffer:	pointer to SAL error record
 * @slidx:	pointer to index of SAL error record
 *
 * Return value:
 *	1 if record has platform error / 0 if not
 */
#define LOG_INDEX_ADD_SECT_PTR(sect, ptr) \
	{slidx_list_t *hl = &slidx_pool.buffer[slidx_pool.cur_idx]; \
	hl->hdr = ptr; \
	list_add(&hl->list, &(sect)); \
	slidx_pool.cur_idx = (slidx_pool.cur_idx + 1)%slidx_pool.max_idx; }

static int
mca_make_slidx(void *buffer, slidx_table_t *slidx)
{
	int platform_err = 0;
	int record_len = ((sal_log_record_header_t*)buffer)->len;
	u32 ercd_pos;
	int sects;
	sal_log_section_hdr_t *sp;

	/*
	 * Initialize index referring current record
	 */
	INIT_LIST_HEAD(&(slidx->proc_err));
	INIT_LIST_HEAD(&(slidx->mem_dev_err));
	INIT_LIST_HEAD(&(slidx->sel_dev_err));
	INIT_LIST_HEAD(&(slidx->pci_bus_err));
	INIT_LIST_HEAD(&(slidx->smbios_dev_err));
	INIT_LIST_HEAD(&(slidx->pci_comp_err));
	INIT_LIST_HEAD(&(slidx->plat_specific_err));
	INIT_LIST_HEAD(&(slidx->host_ctlr_err));
	INIT_LIST_HEAD(&(slidx->plat_bus_err));
	INIT_LIST_HEAD(&(slidx->unsupported));

	/*
	 * Extract a Record Header
	 */
	slidx->header = buffer;

	/*
	 * Extract each section records
	 * (arranged from "int ia64_log_platform_info_print()")
	 */
	for (ercd_pos = sizeof(sal_log_record_header_t), sects = 0;
		ercd_pos < record_len; ercd_pos += sp->len, sects++) {
		sp = (sal_log_section_hdr_t *)((char*)buffer + ercd_pos);
		if (!efi_guidcmp(sp->guid, SAL_PROC_DEV_ERR_SECT_GUID)) {
			LOG_INDEX_ADD_SECT_PTR(slidx->proc_err, sp);
		} else if (!efi_guidcmp(sp->guid,
				SAL_PLAT_MEM_DEV_ERR_SECT_GUID)) {
			platform_err = 1;
			LOG_INDEX_ADD_SECT_PTR(slidx->mem_dev_err, sp);
		} else if (!efi_guidcmp(sp->guid,
				SAL_PLAT_SEL_DEV_ERR_SECT_GUID)) {
			platform_err = 1;
			LOG_INDEX_ADD_SECT_PTR(slidx->sel_dev_err, sp);
		} else if (!efi_guidcmp(sp->guid,
				SAL_PLAT_PCI_BUS_ERR_SECT_GUID)) {
			platform_err = 1;
			LOG_INDEX_ADD_SECT_PTR(slidx->pci_bus_err, sp);
		} else if (!efi_guidcmp(sp->guid,
				SAL_PLAT_SMBIOS_DEV_ERR_SECT_GUID)) {
			platform_err = 1;
			LOG_INDEX_ADD_SECT_PTR(slidx->smbios_dev_err, sp);
		} else if (!efi_guidcmp(sp->guid,
				SAL_PLAT_PCI_COMP_ERR_SECT_GUID)) {
			platform_err = 1;
			LOG_INDEX_ADD_SECT_PTR(slidx->pci_comp_err, sp);
		} else if (!efi_guidcmp(sp->guid,
				SAL_PLAT_SPECIFIC_ERR_SECT_GUID)) {
			platform_err = 1;
			LOG_INDEX_ADD_SECT_PTR(slidx->plat_specific_err, sp);
		} else if (!efi_guidcmp(sp->guid,
				SAL_PLAT_HOST_CTLR_ERR_SECT_GUID)) {
			platform_err = 1;
			LOG_INDEX_ADD_SECT_PTR(slidx->host_ctlr_err, sp);
		} else if (!efi_guidcmp(sp->guid,
				SAL_PLAT_BUS_ERR_SECT_GUID)) {
			platform_err = 1;
			LOG_INDEX_ADD_SECT_PTR(slidx->plat_bus_err, sp);
		} else {
			LOG_INDEX_ADD_SECT_PTR(slidx->unsupported, sp);
		}
	}
	slidx->n_sections = sects;

	return platform_err;
}

/**
 * init_record_index_pools - Initialize pool of lists for SAL record index
 *
 * Return value:
 *	0 on Success / -ENOMEM on Failure
 */
static int
init_record_index_pools(void)
{
	int i;
	int rec_max_size;  /* Maximum size of SAL error records */
	int sect_min_size; /* Minimum size of SAL error sections */
	/* minimum size table of each section */
	static int sal_log_sect_min_sizes[] = {
		sizeof(sal_log_processor_info_t)
		+ sizeof(sal_processor_static_info_t),
		sizeof(sal_log_mem_dev_err_info_t),
		sizeof(sal_log_sel_dev_err_info_t),
		sizeof(sal_log_pci_bus_err_info_t),
		sizeof(sal_log_smbios_dev_err_info_t),
		sizeof(sal_log_pci_comp_err_info_t),
		sizeof(sal_log_plat_specific_err_info_t),
		sizeof(sal_log_host_ctlr_err_info_t),
		sizeof(sal_log_plat_bus_err_info_t),
	};

	/*
	 * MCA handler cannot allocate new memory on flight,
	 * so we preallocate enough memory to handle a SAL record.
	 *
	 * Initialize a handling set of slidx_pool:
	 *   1. Pick up the max size of SAL error records
	 *   2. Pick up the min size of SAL error sections
	 *   3. Allocate the pool as enough to 2 SAL records
	 *     (now we can estimate the maxinum of section in a record.)
	 */

	/* - 1 - */
	rec_max_size = sal_rec_max;

	/* - 2 - */
	sect_min_size = sal_log_sect_min_sizes[0];
	for (i = 1; i < sizeof sal_log_sect_min_sizes/sizeof(size_t); i++)
		if (sect_min_size > sal_log_sect_min_sizes[i])
			sect_min_size = sal_log_sect_min_sizes[i];

	/* - 3 - */
	slidx_pool.max_idx = (rec_max_size/sect_min_size) * 2 + 1;
	slidx_pool.buffer = (slidx_list_t *)
		kmalloc(slidx_pool.max_idx * sizeof(slidx_list_t), GFP_KERNEL);

	return slidx_pool.buffer ? 0 : -ENOMEM;
}


/*****************************************************************************
 * Recovery functions                                                        *
 *****************************************************************************/

/**
 * is_mca_global - Check whether this MCA is global or not
 * @peidx:	pointer of index of processor error section
 * @pbci:	pointer to pal_bus_check_info_t
 * @sos:	pointer to hand off struct between SAL and OS
 *
 * Return value:
 *	MCA_IS_LOCAL / MCA_IS_GLOBAL
 */

static mca_type_t
is_mca_global(peidx_table_t *peidx, pal_bus_check_info_t *pbci,
	      struct ia64_sal_os_state *sos)
{
	pal_processor_state_info_t *psp =
		(pal_processor_state_info_t*)peidx_psp(peidx);

	/*
	 * PAL can request a rendezvous, if the MCA has a global scope.
	 * If "rz_always" flag is set, SAL requests MCA rendezvous
	 * in spite of global MCA.
	 * Therefore it is local MCA when rendezvous has not been requested.
	 * Failed to rendezvous, the system must be down.
	 */
	switch (sos->rv_rc) {
		case -1: /* SAL rendezvous unsuccessful */
			return MCA_IS_GLOBAL;
		case  0: /* SAL rendezvous not required */
			return MCA_IS_LOCAL;
		case  1: /* SAL rendezvous successful int */
		case  2: /* SAL rendezvous successful int with init */
		default:
			break;
	}

	/*
	 * If One or more Cache/TLB/Reg_File/Uarch_Check is here,