android_kernel_xiaomi_sm8350/arch/ia64/kernel/mca_drv.c
Russ Anderson b1b901c202 [IA64] MCA recovery improvements
Jack Steiner uncovered some opportunities for improvement in
the MCA recovery code.

  1) Set bsp to save registers on the kernel stack.
  2) Disable interrupts while in the MCA recovery code.
  3) Change the way the user process is killed, to avoid 
     a panic in schedule.

Testing shows that these changes make the recovery code much 
more reliable with the 2.6.12 kernel.

Signed-off-by: Russ Anderson <rja@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
2005-05-03 13:47:42 -07:00

640 lines
18 KiB
C

/*
* File: mca_drv.c
* Purpose: Generic MCA handling layer
*
* Copyright (C) 2004 FUJITSU LIMITED
* Copyright (C) Hidetoshi Seto (seto.hidetoshi@jp.fujitsu.com)
*/
#include <linux/config.h>
#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.c */
static ia64_mca_sal_to_os_state_t *sal_to_os_handoff_state;
static ia64_mca_os_to_sal_state_t *os_to_sal_handoff_state;
/* 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 = 0,
ISOLATE_OK = 1
} isolate_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;
/**
* mca_page_isolate - isolate a poisoned page in order not to use it later
* @paddr: poisoned memory location
*
* Return value:
* ISOLATE_OK / ISOLATE_NG
*/
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_NG;
/* 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 */
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)
{
printk(KERN_DEBUG "OS_MCA: process [pid: %d](%s) encounters MCA.\n",
current->pid, current->comm);
spin_lock(&mca_bh_lock);
if (mca_page_isolate(paddr) == ISOLATE_OK) {
printk(KERN_DEBUG "Page isolation: ( %lx ) success.\n", paddr);
} else {
printk(KERN_DEBUG "Page isolation: ( %lx ) failure.\n", paddr);
}
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
*
* 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)
{
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 (sal_to_os_handoff_state->imsto_rendez_state) {
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
*
* 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)
{
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 0;
/*
* 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.
*/
psr1 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_ipsr);
/*
* Check the privilege level of interrupted context.
* If it is user-mode, then terminate affected process.
*/
if (psr1->cpl != 0) {
smei = peidx_bus_check(peidx, 0);
if (smei->valid.target_identifier) {
/*
* setup for resume to bottom half of MCA,
* "mca_handler_bhhook"
*/
pmsa = (pal_min_state_area_t *)(sal_to_os_handoff_state->pal_min_state | (6ul<<61));
/* pass to bhhook as 1st argument (gr8) */
pmsa->pmsa_gr[8-1] = smei->target_identifier;
/* 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->i = 0;
return 1;
}
}
return 0;
}
/**
* 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
*
* 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)
{
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);
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
*
* 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)
{
pal_processor_state_info_t *psp = (pal_processor_state_info_t*)peidx_psp(peidx);
/*
* We cannot recover errors with other than bus_check.
*/
if (psp->cc || psp->rc || psp->uc)
return 0;
/*
* If there is no bus error, record is weird but we need not to recover.
*/
if (psp->bc == 0 || pbci == NULL)
return 1;
/*
* Sorry, we cannot handle so many.
*/
if (peidx_bus_check_num(peidx) > 1)
return 0;
/*
* Well, here is only one bus error.
*/
if (pbci->ib || pbci->cc)
return 0;
if (pbci->eb && pbci->bsi > 0)
return 0;
if (psp->ci == 0)
return 0;
/*
* 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);
/*
* On account of strange SAL error record, we cannot recover.
*/
return 0;
}
/**
* mca_try_to_recover - Try to recover from MCA
* @rec: pointer to a SAL error record
*
* Return value:
* 1 on Success / 0 on Failure
*/
static int
mca_try_to_recover(void *rec,
ia64_mca_sal_to_os_state_t *sal_to_os_state,
ia64_mca_os_to_sal_state_t *os_to_sal_state)
{
int platform_err;
int n_proc_err;
slidx_table_t slidx;
peidx_table_t peidx;
pal_bus_check_info_t pbci;
/* handoff state from/to mca.c */
sal_to_os_handoff_state = sal_to_os_state;
os_to_sal_handoff_state = os_to_sal_state;
/* 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 0;
else if (n_proc_err == 0) {
/* Weird SAL record ... We need not to recover */
return 1;
}
/* 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))
return 0;
/* Try to recover a processor error */
return recover_from_processor_error(platform_err, &slidx, &peidx, &pbci);
}
/*
* =============================================================================
*/
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");