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linux/arch/ia64/kernel/mca_drv.c
Hidetoshi Seto 43ed3baf62 [IA64] printing support for MCA/INIT 
Printing message to console from MCA/INIT handler is useful,
however doing oops_in_progress = 1 in them exactly makes
something in kernel wrong. Especially it sounds ugly if
system goes wrong after returning from recoverable MCA.

This patch adds ia64_mca_printk() function that collects
messages into temporary-not-so-large message buffer during
in MCA/INIT environment and print them out later, after
returning to normal context or when handlers determine to
down the system.

Also this print function is exported for use in extensional
MCA handler. It would be useful to describe detail about
recovery.

NOTE:
I don't think it is sane thing if temporary message buffer
is enlarged enough to hold whole stack dumps from INIT, so
buffering is disabled during stack dump from INIT-monarch
(= default_monarch_init_process). please fix it in future.

Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Acked-by: Russ Anderson <rja@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
2006-09-26 14:44:37 -07:00

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/*
* File: mca_drv.c
* Purpose: Generic MCA handling layer
*
* Copyright (C) 2004 FUJITSU LIMITED
* Copyright (C) Hidetoshi Seto (seto.hidetoshi@jp.fujitsu.com)
* Copyright (C) 2005 Silicon Graphics, Inc
* Copyright (C) 2005 Keith Owens <kaos@sgi.com>
* Copyright (C) 2006 Russ Anderson <rja@sgi.com>
*/
#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/smp_lock.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,
* it would be a local MCA. (i.e. processor internal error)
*/
if (psp->tc || psp->cc || psp->rc || psp->uc)
return MCA_IS_LOCAL;
/*
* Bus_Check structure with Bus_Check.ib (internal bus error) flag set
* would be a global MCA. (e.g. a system bus address parity error)
*/
if (!pbci || pbci->ib)
return MCA_IS_GLOBAL;
/*
* Bus_Check structure with Bus_Check.eb (external bus error) flag set
* could be either a local MCA or a global MCA.
*
* Referring Bus_Check.bsi:
* 0: Unknown/unclassified
* 1: BERR#
* 2: BINIT#
* 3: Hard Fail
* (FIXME: Are these SGI specific or generic bsi values?)
*/
if (pbci->eb)
switch (pbci->bsi) {
case 0:
/* e.g. a load from poisoned memory */
return MCA_IS_LOCAL;
case 1:
case 2:
case 3:
return MCA_IS_GLOBAL;
}
return MCA_IS_GLOBAL;
}
/**
* recover_from_read_error - Try to recover the errors which type are "read"s.
* @slidx: pointer of index of SAL error record
* @peidx: pointer of index of processor error section
* @pbci: pointer of pal_bus_check_info
* @sos: pointer to hand off struct between SAL and OS
*
* Return value:
* 1 on Success / 0 on Failure
*/
static int
recover_from_read_error(slidx_table_t *slidx,
peidx_table_t *peidx, pal_bus_check_info_t *pbci,
struct ia64_sal_os_state *sos)
{
sal_log_mod_error_info_t *smei;
pal_min_state_area_t *pmsa;
struct ia64_psr *psr1, *psr2;
ia64_fptr_t *mca_hdlr_bh = (ia64_fptr_t*)mca_handler_bhhook;
/* Is target address valid? */
if (!pbci->tv)
return fatal_mca("target address not valid");
/*
* cpu read or memory-mapped io read
*
* offending process affected process OS MCA do
* kernel mode kernel mode down system
* kernel mode user mode kill the process
* user mode kernel mode down system (*)
* user mode user mode kill the process
*
* (*) You could terminate offending user-mode process
* if (pbci->pv && pbci->pl != 0) *and* if you sure
* the process not have any locks of kernel.
*/
/* Is minstate valid? */
if (!peidx_bottom(peidx) || !(peidx_bottom(peidx)->valid.minstate))
return fatal_mca("minstate not valid");
psr1 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_ipsr);
psr2 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_xpsr);
/*
* Check the privilege level of interrupted context.
* If it is user-mode, then terminate affected process.
*/
pmsa = sos->pal_min_state;
if (psr1->cpl != 0 ||
((psr2->cpl != 0) && mca_recover_range(pmsa->pmsa_iip))) {
smei = peidx_bus_check(peidx, 0);
if (smei->valid.target_identifier) {
/*
* setup for resume to bottom half of MCA,
* "mca_handler_bhhook"
*/
/* pass to bhhook as argument (gr8, ...) */
pmsa->pmsa_gr[8-1] = smei->target_identifier;
pmsa->pmsa_gr[9-1] = pmsa->pmsa_iip;
pmsa->pmsa_gr[10-1] = pmsa->pmsa_ipsr;
/* set interrupted return address (but no use) */
pmsa->pmsa_br0 = pmsa->pmsa_iip;
/* change resume address to bottom half */
pmsa->pmsa_iip = mca_hdlr_bh->fp;
pmsa->pmsa_gr[1-1] = mca_hdlr_bh->gp;
/* set cpl with kernel mode */
psr2 = (struct ia64_psr *)&pmsa->pmsa_ipsr;
psr2->cpl = 0;
psr2->ri = 0;
psr2->bn = 1;
psr2->i = 0;
return mca_recovered("user memory corruption. "
"kill affected process - recovered.");
}
}
return fatal_mca("kernel context not recovered, iip 0x%lx\n",
pmsa->pmsa_iip);
}
/**
* recover_from_platform_error - Recover from platform error.
* @slidx: pointer of index of SAL error record
* @peidx: pointer of index of processor error section
* @pbci: pointer of pal_bus_check_info
* @sos: pointer to hand off struct between SAL and OS
*
* Return value:
* 1 on Success / 0 on Failure
*/
static int
recover_from_platform_error(slidx_table_t *slidx, peidx_table_t *peidx,
pal_bus_check_info_t *pbci,
struct ia64_sal_os_state *sos)
{
int status = 0;
pal_processor_state_info_t *psp =
(pal_processor_state_info_t*)peidx_psp(peidx);
if (psp->bc && pbci->eb && pbci->bsi == 0) {
switch(pbci->type) {
case 1: /* partial read */
case 3: /* full line(cpu) read */
case 9: /* I/O space read */
status = recover_from_read_error(slidx, peidx, pbci,
sos);
break;
case 0: /* unknown */
case 2: /* partial write */
case 4: /* full line write */
case 5: /* implicit or explicit write-back operation */
case 6: /* snoop probe */
case 7: /* incoming or outgoing ptc.g */
case 8: /* write coalescing transactions */
case 10: /* I/O space write */
case 11: /* inter-processor interrupt message(IPI) */
case 12: /* interrupt acknowledge or
external task priority cycle */
default:
break;
}
}
return status;
}
/**
* recover_from_processor_error
* @platform: whether there are some platform error section or not
* @slidx: pointer of index of SAL error record
* @peidx: pointer of index of processor error section
* @pbci: pointer of pal_bus_check_info
* @sos: pointer to hand off struct between SAL and OS
*
* Return value:
* 1 on Success / 0 on Failure
*/
/*
* Later we try to recover when below all conditions are satisfied.
* 1. Only one processor error section is exist.
* 2. BUS_CHECK is exist and the others are not exist.(Except TLB_CHECK)
* 3. The entry of BUS_CHECK_INFO is 1.
* 4. "External bus error" flag is set and the others are not set.
*/
static int
recover_from_processor_error(int platform, slidx_table_t *slidx,
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);
/*
* Processor recovery status must key off of the PAL recovery
* status in the Processor State Parameter.
*/
/*
* The machine check is corrected.
*/
if (psp->cm == 1)
return mca_recovered("machine check is already corrected.");
/*
* The error was not contained. Software must be reset.
*/
if (psp->us || psp->ci == 0)
return fatal_mca("error not contained");
/*
* The cache check and bus check bits have four possible states
* cc bc
* 0 0 Weird record, not recovered
* 1 0 Cache error, not recovered
* 0 1 I/O error, attempt recovery
* 1 1 Memory error, attempt recovery
*/
if (psp->bc == 0 || pbci == NULL)
return fatal_mca("No bus check");
/*
* Sorry, we cannot handle so many.
*/
if (peidx_bus_check_num(peidx) > 1)
return fatal_mca("Too many bus checks");
/*
* Well, here is only one bus error.
*/
if (pbci->ib)
return fatal_mca("Internal Bus error");
if (pbci->cc)
return fatal_mca("Cache-cache error");
if (pbci->eb && pbci->bsi > 0)
return fatal_mca("External bus check fatal status");
/*
* This is a local MCA and estimated as recoverble external bus error.
* (e.g. a load from poisoned memory)
* This means "there are some platform errors".
*/
if (platform)
return recover_from_platform_error(slidx, peidx, pbci, sos);
/*
* On account of strange SAL error record, we cannot recover.
*/
return fatal_mca("Strange SAL record");
}
/**
* mca_try_to_recover - Try to recover from MCA
* @rec: pointer to a SAL error record
* @sos: pointer to hand off struct between SAL and OS
*
* Return value:
* 1 on Success / 0 on Failure
*/
static int
mca_try_to_recover(void *rec, struct ia64_sal_os_state *sos)
{
int platform_err;
int n_proc_err;
slidx_table_t slidx;
peidx_table_t peidx;
pal_bus_check_info_t pbci;
/* Make index of SAL error record */
platform_err = mca_make_slidx(rec, &slidx);
/* Count processor error sections */
n_proc_err = slidx_count(&slidx, proc_err);
/* Now, OS can recover when there is one processor error section */
if (n_proc_err > 1)
return fatal_mca("Too Many Errors");
else if (n_proc_err == 0)
/* Weird SAL record ... We can't do anything */
return fatal_mca("Weird SAL record");
/* Make index of processor error section */
mca_make_peidx((sal_log_processor_info_t*)
slidx_first_entry(&slidx.proc_err)->hdr, &peidx);
/* Extract Processor BUS_CHECK[0] */
*((u64*)&pbci) = peidx_check_info(&peidx, bus_check, 0);
/* Check whether MCA is global or not */
if (is_mca_global(&peidx, &pbci, sos))
return fatal_mca("global MCA");
/* Try to recover a processor error */
return recover_from_processor_error(platform_err, &slidx, &peidx,
&pbci, sos);
}
/*
* =============================================================================
*/
int __init mca_external_handler_init(void)
{
if (init_record_index_pools())
return -ENOMEM;
/* register external mca handlers */
if (ia64_reg_MCA_extension(mca_try_to_recover)) {
printk(KERN_ERR "ia64_reg_MCA_extension failed.\n");
kfree(slidx_pool.buffer);
return -EFAULT;
}
return 0;
}
void __exit mca_external_handler_exit(void)
{
/* unregister external mca handlers */
ia64_unreg_MCA_extension();
kfree(slidx_pool.buffer);
}
module_init(mca_external_handler_init);
module_exit(mca_external_handler_exit);
module_param(sal_rec_max, int, 0644);
MODULE_PARM_DESC(sal_rec_max, "Max size of SAL error record");
MODULE_DESCRIPTION("ia64 platform dependent mca handler driver");
MODULE_LICENSE("GPL");
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