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![Hidetoshi Seto](/assets/img/avatar_default.png)
MCA driver can cause panic if kernel gets a state info with no minstate. This patch adds minstate validation before handling it. Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
682 lines
18 KiB
C
682 lines
18 KiB
C
/*
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* File: mca_drv.c
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* Purpose: Generic MCA handling layer
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*
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* Copyright (C) 2004 FUJITSU LIMITED
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* Copyright (C) Hidetoshi Seto (seto.hidetoshi@jp.fujitsu.com)
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* Copyright (C) 2005 Silicon Graphics, Inc
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* Copyright (C) 2005 Keith Owens <kaos@sgi.com>
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*/
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/kallsyms.h>
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#include <linux/smp_lock.h>
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#include <linux/bootmem.h>
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#include <linux/acpi.h>
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#include <linux/timer.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/smp.h>
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#include <linux/workqueue.h>
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#include <linux/mm.h>
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#include <asm/delay.h>
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#include <asm/machvec.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include <asm/system.h>
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#include <asm/sal.h>
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#include <asm/mca.h>
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#include <asm/irq.h>
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#include <asm/hw_irq.h>
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#include "mca_drv.h"
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/* max size of SAL error record (default) */
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static int sal_rec_max = 10000;
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/* from mca_drv_asm.S */
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extern void *mca_handler_bhhook(void);
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static DEFINE_SPINLOCK(mca_bh_lock);
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typedef enum {
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MCA_IS_LOCAL = 0,
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MCA_IS_GLOBAL = 1
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} mca_type_t;
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#define MAX_PAGE_ISOLATE 1024
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static struct page *page_isolate[MAX_PAGE_ISOLATE];
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static int num_page_isolate = 0;
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typedef enum {
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ISOLATE_NG,
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ISOLATE_OK,
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ISOLATE_NONE
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} isolate_status_t;
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/*
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* This pool keeps pointers to the section part of SAL error record
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*/
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static struct {
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slidx_list_t *buffer; /* section pointer list pool */
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int cur_idx; /* Current index of section pointer list pool */
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int max_idx; /* Maximum index of section pointer list pool */
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} slidx_pool;
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/**
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* mca_page_isolate - isolate a poisoned page in order not to use it later
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* @paddr: poisoned memory location
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*
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* Return value:
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* one of isolate_status_t, ISOLATE_OK/NG/NONE.
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*/
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static isolate_status_t
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mca_page_isolate(unsigned long paddr)
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{
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int i;
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struct page *p;
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/* whether physical address is valid or not */
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if (!ia64_phys_addr_valid(paddr))
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return ISOLATE_NONE;
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if (!pfn_valid(paddr >> PAGE_SHIFT))
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return ISOLATE_NONE;
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/* convert physical address to physical page number */
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p = pfn_to_page(paddr>>PAGE_SHIFT);
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/* check whether a page number have been already registered or not */
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for (i = 0; i < num_page_isolate; i++)
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if (page_isolate[i] == p)
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return ISOLATE_OK; /* already listed */
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/* limitation check */
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if (num_page_isolate == MAX_PAGE_ISOLATE)
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return ISOLATE_NG;
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/* kick pages having attribute 'SLAB' or 'Reserved' */
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if (PageSlab(p) || PageReserved(p))
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return ISOLATE_NG;
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/* add attribute 'Reserved' and register the page */
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get_page(p);
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SetPageReserved(p);
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page_isolate[num_page_isolate++] = p;
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return ISOLATE_OK;
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}
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/**
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* mca_hanlder_bh - Kill the process which occurred memory read error
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* @paddr: poisoned address received from MCA Handler
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*/
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void
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mca_handler_bh(unsigned long paddr)
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{
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printk(KERN_DEBUG "OS_MCA: process [pid: %d](%s) encounters MCA.\n",
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current->pid, current->comm);
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spin_lock(&mca_bh_lock);
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switch (mca_page_isolate(paddr)) {
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case ISOLATE_OK:
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printk(KERN_DEBUG "Page isolation: ( %lx ) success.\n", paddr);
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break;
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case ISOLATE_NG:
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printk(KERN_DEBUG "Page isolation: ( %lx ) failure.\n", paddr);
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break;
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default:
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break;
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}
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spin_unlock(&mca_bh_lock);
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/* This process is about to be killed itself */
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do_exit(SIGKILL);
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}
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/**
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* mca_make_peidx - Make index of processor error section
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* @slpi: pointer to record of processor error section
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* @peidx: pointer to index of processor error section
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*/
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static void
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mca_make_peidx(sal_log_processor_info_t *slpi, peidx_table_t *peidx)
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{
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/*
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* calculate the start address of
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* "struct cpuid_info" and "sal_processor_static_info_t".
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*/
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u64 total_check_num = slpi->valid.num_cache_check
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+ slpi->valid.num_tlb_check
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+ slpi->valid.num_bus_check
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+ slpi->valid.num_reg_file_check
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+ slpi->valid.num_ms_check;
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u64 head_size = sizeof(sal_log_mod_error_info_t) * total_check_num
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+ sizeof(sal_log_processor_info_t);
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u64 mid_size = slpi->valid.cpuid_info * sizeof(struct sal_cpuid_info);
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peidx_head(peidx) = slpi;
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peidx_mid(peidx) = (struct sal_cpuid_info *)
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(slpi->valid.cpuid_info ? ((char*)slpi + head_size) : NULL);
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peidx_bottom(peidx) = (sal_processor_static_info_t *)
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(slpi->valid.psi_static_struct ?
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((char*)slpi + head_size + mid_size) : NULL);
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}
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/**
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* mca_make_slidx - Make index of SAL error record
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* @buffer: pointer to SAL error record
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* @slidx: pointer to index of SAL error record
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*
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* Return value:
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* 1 if record has platform error / 0 if not
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*/
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#define LOG_INDEX_ADD_SECT_PTR(sect, ptr) \
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{slidx_list_t *hl = &slidx_pool.buffer[slidx_pool.cur_idx]; \
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hl->hdr = ptr; \
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list_add(&hl->list, &(sect)); \
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slidx_pool.cur_idx = (slidx_pool.cur_idx + 1)%slidx_pool.max_idx; }
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static int
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mca_make_slidx(void *buffer, slidx_table_t *slidx)
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{
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int platform_err = 0;
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int record_len = ((sal_log_record_header_t*)buffer)->len;
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u32 ercd_pos;
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int sects;
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sal_log_section_hdr_t *sp;
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/*
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* Initialize index referring current record
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*/
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INIT_LIST_HEAD(&(slidx->proc_err));
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INIT_LIST_HEAD(&(slidx->mem_dev_err));
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INIT_LIST_HEAD(&(slidx->sel_dev_err));
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INIT_LIST_HEAD(&(slidx->pci_bus_err));
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INIT_LIST_HEAD(&(slidx->smbios_dev_err));
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INIT_LIST_HEAD(&(slidx->pci_comp_err));
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INIT_LIST_HEAD(&(slidx->plat_specific_err));
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INIT_LIST_HEAD(&(slidx->host_ctlr_err));
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INIT_LIST_HEAD(&(slidx->plat_bus_err));
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INIT_LIST_HEAD(&(slidx->unsupported));
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/*
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* Extract a Record Header
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*/
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slidx->header = buffer;
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/*
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* Extract each section records
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* (arranged from "int ia64_log_platform_info_print()")
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*/
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for (ercd_pos = sizeof(sal_log_record_header_t), sects = 0;
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ercd_pos < record_len; ercd_pos += sp->len, sects++) {
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sp = (sal_log_section_hdr_t *)((char*)buffer + ercd_pos);
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if (!efi_guidcmp(sp->guid, SAL_PROC_DEV_ERR_SECT_GUID)) {
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LOG_INDEX_ADD_SECT_PTR(slidx->proc_err, sp);
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} else if (!efi_guidcmp(sp->guid,
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SAL_PLAT_MEM_DEV_ERR_SECT_GUID)) {
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platform_err = 1;
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LOG_INDEX_ADD_SECT_PTR(slidx->mem_dev_err, sp);
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} else if (!efi_guidcmp(sp->guid,
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SAL_PLAT_SEL_DEV_ERR_SECT_GUID)) {
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platform_err = 1;
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LOG_INDEX_ADD_SECT_PTR(slidx->sel_dev_err, sp);
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} else if (!efi_guidcmp(sp->guid,
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SAL_PLAT_PCI_BUS_ERR_SECT_GUID)) {
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platform_err = 1;
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LOG_INDEX_ADD_SECT_PTR(slidx->pci_bus_err, sp);
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} else if (!efi_guidcmp(sp->guid,
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SAL_PLAT_SMBIOS_DEV_ERR_SECT_GUID)) {
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platform_err = 1;
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LOG_INDEX_ADD_SECT_PTR(slidx->smbios_dev_err, sp);
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} else if (!efi_guidcmp(sp->guid,
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SAL_PLAT_PCI_COMP_ERR_SECT_GUID)) {
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platform_err = 1;
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LOG_INDEX_ADD_SECT_PTR(slidx->pci_comp_err, sp);
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} else if (!efi_guidcmp(sp->guid,
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SAL_PLAT_SPECIFIC_ERR_SECT_GUID)) {
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platform_err = 1;
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LOG_INDEX_ADD_SECT_PTR(slidx->plat_specific_err, sp);
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} else if (!efi_guidcmp(sp->guid,
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SAL_PLAT_HOST_CTLR_ERR_SECT_GUID)) {
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platform_err = 1;
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LOG_INDEX_ADD_SECT_PTR(slidx->host_ctlr_err, sp);
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} else if (!efi_guidcmp(sp->guid,
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SAL_PLAT_BUS_ERR_SECT_GUID)) {
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platform_err = 1;
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LOG_INDEX_ADD_SECT_PTR(slidx->plat_bus_err, sp);
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} else {
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LOG_INDEX_ADD_SECT_PTR(slidx->unsupported, sp);
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}
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}
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slidx->n_sections = sects;
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return platform_err;
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}
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/**
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* init_record_index_pools - Initialize pool of lists for SAL record index
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*
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* Return value:
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* 0 on Success / -ENOMEM on Failure
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*/
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static int
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init_record_index_pools(void)
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{
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int i;
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int rec_max_size; /* Maximum size of SAL error records */
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int sect_min_size; /* Minimum size of SAL error sections */
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/* minimum size table of each section */
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static int sal_log_sect_min_sizes[] = {
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sizeof(sal_log_processor_info_t)
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+ sizeof(sal_processor_static_info_t),
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sizeof(sal_log_mem_dev_err_info_t),
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sizeof(sal_log_sel_dev_err_info_t),
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sizeof(sal_log_pci_bus_err_info_t),
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sizeof(sal_log_smbios_dev_err_info_t),
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sizeof(sal_log_pci_comp_err_info_t),
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sizeof(sal_log_plat_specific_err_info_t),
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sizeof(sal_log_host_ctlr_err_info_t),
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sizeof(sal_log_plat_bus_err_info_t),
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};
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/*
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* MCA handler cannot allocate new memory on flight,
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* so we preallocate enough memory to handle a SAL record.
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*
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* Initialize a handling set of slidx_pool:
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* 1. Pick up the max size of SAL error records
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* 2. Pick up the min size of SAL error sections
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* 3. Allocate the pool as enough to 2 SAL records
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* (now we can estimate the maxinum of section in a record.)
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*/
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/* - 1 - */
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rec_max_size = sal_rec_max;
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/* - 2 - */
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sect_min_size = sal_log_sect_min_sizes[0];
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for (i = 1; i < sizeof sal_log_sect_min_sizes/sizeof(size_t); i++)
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if (sect_min_size > sal_log_sect_min_sizes[i])
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sect_min_size = sal_log_sect_min_sizes[i];
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/* - 3 - */
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slidx_pool.max_idx = (rec_max_size/sect_min_size) * 2 + 1;
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slidx_pool.buffer = (slidx_list_t *)
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kmalloc(slidx_pool.max_idx * sizeof(slidx_list_t), GFP_KERNEL);
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return slidx_pool.buffer ? 0 : -ENOMEM;
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}
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/*****************************************************************************
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* Recovery functions *
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*****************************************************************************/
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/**
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* is_mca_global - Check whether this MCA is global or not
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* @peidx: pointer of index of processor error section
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* @pbci: pointer to pal_bus_check_info_t
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* @sos: pointer to hand off struct between SAL and OS
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*
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* Return value:
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* MCA_IS_LOCAL / MCA_IS_GLOBAL
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*/
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static mca_type_t
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is_mca_global(peidx_table_t *peidx, pal_bus_check_info_t *pbci,
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struct ia64_sal_os_state *sos)
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{
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pal_processor_state_info_t *psp =
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(pal_processor_state_info_t*)peidx_psp(peidx);
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/*
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* PAL can request a rendezvous, if the MCA has a global scope.
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* If "rz_always" flag is set, SAL requests MCA rendezvous
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* in spite of global MCA.
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* Therefore it is local MCA when rendezvous has not been requested.
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* Failed to rendezvous, the system must be down.
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*/
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switch (sos->rv_rc) {
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case -1: /* SAL rendezvous unsuccessful */
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return MCA_IS_GLOBAL;
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case 0: /* SAL rendezvous not required */
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return MCA_IS_LOCAL;
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case 1: /* SAL rendezvous successful int */
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case 2: /* SAL rendezvous successful int with init */
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default:
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break;
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}
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/*
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* If One or more Cache/TLB/Reg_File/Uarch_Check is here,
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* it would be a local MCA. (i.e. processor internal error)
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*/
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if (psp->tc || psp->cc || psp->rc || psp->uc)
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return MCA_IS_LOCAL;
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/*
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* Bus_Check structure with Bus_Check.ib (internal bus error) flag set
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* would be a global MCA. (e.g. a system bus address parity error)
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*/
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if (!pbci || pbci->ib)
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return MCA_IS_GLOBAL;
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/*
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* Bus_Check structure with Bus_Check.eb (external bus error) flag set
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* could be either a local MCA or a global MCA.
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*
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* Referring Bus_Check.bsi:
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* 0: Unknown/unclassified
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* 1: BERR#
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* 2: BINIT#
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* 3: Hard Fail
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* (FIXME: Are these SGI specific or generic bsi values?)
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*/
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if (pbci->eb)
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switch (pbci->bsi) {
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case 0:
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/* e.g. a load from poisoned memory */
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return MCA_IS_LOCAL;
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case 1:
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case 2:
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case 3:
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return MCA_IS_GLOBAL;
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}
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return MCA_IS_GLOBAL;
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}
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/**
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* recover_from_read_error - Try to recover the errors which type are "read"s.
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* @slidx: pointer of index of SAL error record
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* @peidx: pointer of index of processor error section
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* @pbci: pointer of pal_bus_check_info
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* @sos: pointer to hand off struct between SAL and OS
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*
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* Return value:
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* 1 on Success / 0 on Failure
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*/
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static int
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recover_from_read_error(slidx_table_t *slidx,
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peidx_table_t *peidx, pal_bus_check_info_t *pbci,
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struct ia64_sal_os_state *sos)
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{
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sal_log_mod_error_info_t *smei;
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pal_min_state_area_t *pmsa;
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struct ia64_psr *psr1, *psr2;
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ia64_fptr_t *mca_hdlr_bh = (ia64_fptr_t*)mca_handler_bhhook;
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/* Is target address valid? */
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if (!pbci->tv)
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return 0;
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/*
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* cpu read or memory-mapped io read
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*
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* offending process affected process OS MCA do
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* kernel mode kernel mode down system
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* kernel mode user mode kill the process
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* user mode kernel mode down system (*)
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* user mode user mode kill the process
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*
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* (*) You could terminate offending user-mode process
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* if (pbci->pv && pbci->pl != 0) *and* if you sure
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* the process not have any locks of kernel.
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*/
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/* Is minstate valid? */
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if (!peidx_bottom(peidx) || !(peidx_bottom(peidx)->valid.minstate))
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return 0;
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psr1 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_ipsr);
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/*
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* Check the privilege level of interrupted context.
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* If it is user-mode, then terminate affected process.
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*/
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if (psr1->cpl != 0) {
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smei = peidx_bus_check(peidx, 0);
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if (smei->valid.target_identifier) {
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/*
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* setup for resume to bottom half of MCA,
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* "mca_handler_bhhook"
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*/
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pmsa = sos->pal_min_state;
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/* pass to bhhook as 1st argument (gr8) */
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pmsa->pmsa_gr[8-1] = smei->target_identifier;
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/* set interrupted return address (but no use) */
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pmsa->pmsa_br0 = pmsa->pmsa_iip;
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/* change resume address to bottom half */
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pmsa->pmsa_iip = mca_hdlr_bh->fp;
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pmsa->pmsa_gr[1-1] = mca_hdlr_bh->gp;
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/* set cpl with kernel mode */
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psr2 = (struct ia64_psr *)&pmsa->pmsa_ipsr;
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psr2->cpl = 0;
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psr2->ri = 0;
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psr2->i = 0;
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return 1;
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}
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}
|
|
|
|
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
|
|
* @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 1;
|
|
|
|
/*
|
|
* The error was not contained. Software must be reset.
|
|
*/
|
|
if (psp->us || psp->ci == 0)
|
|
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;
|
|
|
|
/*
|
|
* 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 0;
|
|
}
|
|
|
|
/**
|
|
* 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 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, sos))
|
|
return 0;
|
|
|
|
/* 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");
|