32709d8ae6
When SAL calls back into the OS, the OS code is running with preempt disabled so it cannot call sleeping functions. Signed-off-by: Keith Owens <kaos@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
144 lines
4.0 KiB
C
144 lines
4.0 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/timer.h>
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#include <linux/vmalloc.h>
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#include <asm/mca.h>
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#include <asm/sal.h>
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#include <asm/sn/sn_sal.h>
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/*
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* Interval for calling SAL to poll for errors that do NOT cause error
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* interrupts. SAL will raise a CPEI if any errors are present that
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* need to be logged.
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*/
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#define CPEI_INTERVAL (5*HZ)
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struct timer_list sn_cpei_timer;
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void sn_init_cpei_timer(void);
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/* Printing oemdata from mca uses data that is not passed through SAL, it is
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* global. Only one user at a time.
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*/
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static DECLARE_MUTEX(sn_oemdata_mutex);
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static u8 **sn_oemdata;
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static u64 *sn_oemdata_size, sn_oemdata_bufsize;
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/*
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* print_hook
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*
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* This function is the callback routine that SAL calls to log error
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* info for platform errors. buf is appended to sn_oemdata, resizing as
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* required.
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* Note: this is a SAL to OS callback, running under the same rules as the SAL
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* code. SAL calls are run with preempt disabled so this routine must not
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* sleep. vmalloc can sleep so print_hook cannot resize the output buffer
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* itself, instead it must set the required size and return to let the caller
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* resize the buffer then redrive the SAL call.
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*/
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static int print_hook(const char *fmt, ...)
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{
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char buf[400];
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int len;
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va_list args;
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va_start(args, fmt);
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vsnprintf(buf, sizeof(buf), fmt, args);
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va_end(args);
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len = strlen(buf);
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if (*sn_oemdata_size + len <= sn_oemdata_bufsize)
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memcpy(*sn_oemdata + *sn_oemdata_size, buf, len);
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*sn_oemdata_size += len;
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return 0;
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}
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static void sn_cpei_handler(int irq, void *devid, struct pt_regs *regs)
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{
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/*
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* this function's sole purpose is to call SAL when we receive
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* a CE interrupt from SHUB or when the timer routine decides
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* we need to call SAL to check for CEs.
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*/
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/* CALL SAL_LOG_CE */
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ia64_sn_plat_cpei_handler();
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}
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static void sn_cpei_timer_handler(unsigned long dummy)
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{
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sn_cpei_handler(-1, NULL, NULL);
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mod_timer(&sn_cpei_timer, jiffies + CPEI_INTERVAL);
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}
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void sn_init_cpei_timer(void)
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{
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init_timer(&sn_cpei_timer);
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sn_cpei_timer.expires = jiffies + CPEI_INTERVAL;
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sn_cpei_timer.function = sn_cpei_timer_handler;
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add_timer(&sn_cpei_timer);
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}
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static int
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sn_platform_plat_specific_err_print(const u8 * sect_header, u8 ** oemdata,
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u64 * oemdata_size)
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{
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down(&sn_oemdata_mutex);
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sn_oemdata = oemdata;
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sn_oemdata_size = oemdata_size;
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sn_oemdata_bufsize = 0;
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*sn_oemdata_size = PAGE_SIZE; /* first guess at how much data will be generated */
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while (*sn_oemdata_size > sn_oemdata_bufsize) {
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u8 *newbuf = vmalloc(*sn_oemdata_size);
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if (!newbuf) {
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printk(KERN_ERR "%s: unable to extend sn_oemdata\n",
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__FUNCTION__);
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return 1;
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}
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vfree(*sn_oemdata);
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*sn_oemdata = newbuf;
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sn_oemdata_bufsize = *sn_oemdata_size;
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*sn_oemdata_size = 0;
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ia64_sn_plat_specific_err_print(print_hook, (char *)sect_header);
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}
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up(&sn_oemdata_mutex);
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return 0;
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}
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/* Callback when userspace salinfo wants to decode oem data via the platform
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* kernel and/or prom.
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*/
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int sn_salinfo_platform_oemdata(const u8 *sect_header, u8 **oemdata, u64 *oemdata_size)
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{
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efi_guid_t guid = *(efi_guid_t *)sect_header;
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int valid = 0;
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*oemdata_size = 0;
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vfree(*oemdata);
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*oemdata = NULL;
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if (efi_guidcmp(guid, SAL_PLAT_SPECIFIC_ERR_SECT_GUID) == 0) {
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sal_log_plat_specific_err_info_t *psei = (sal_log_plat_specific_err_info_t *)sect_header;
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valid = psei->valid.oem_data;
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} else if (efi_guidcmp(guid, SAL_PLAT_MEM_DEV_ERR_SECT_GUID) == 0) {
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sal_log_mem_dev_err_info_t *mdei = (sal_log_mem_dev_err_info_t *)sect_header;
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valid = mdei->valid.oem_data;
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}
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if (valid)
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return sn_platform_plat_specific_err_print(sect_header, oemdata, oemdata_size);
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else
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return 0;
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}
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static int __init sn_salinfo_init(void)
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{
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salinfo_platform_oemdata = &sn_salinfo_platform_oemdata;
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return 0;
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}
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module_init(sn_salinfo_init)
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