1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (c) 2000-2006 Silicon Graphics, Inc.  All Rights Reserved.
7 */
8
9#include <linux/types.h>
10#include <linux/kernel.h>
11#include <linux/timer.h>
12#include <linux/vmalloc.h>
13#include <linux/mutex.h>
14#include <asm/mca.h>
15#include <asm/sal.h>
16#include <asm/sn/sn_sal.h>
17
18/*
19 * Interval for calling SAL to poll for errors that do NOT cause error
20 * interrupts. SAL will raise a CPEI if any errors are present that
21 * need to be logged.
22 */
23#define CPEI_INTERVAL	(5*HZ)
24
25struct timer_list sn_cpei_timer;
26void sn_init_cpei_timer(void);
27
28/* Printing oemdata from mca uses data that is not passed through SAL, it is
29 * global.  Only one user at a time.
30 */
31static DEFINE_MUTEX(sn_oemdata_mutex);
32static u8 **sn_oemdata;
33static u64 *sn_oemdata_size, sn_oemdata_bufsize;
34
35/*
36 * print_hook
37 *
38 * This function is the callback routine that SAL calls to log error
39 * info for platform errors.  buf is appended to sn_oemdata, resizing as
40 * required.
41 * Note: this is a SAL to OS callback, running under the same rules as the SAL
42 * code.  SAL calls are run with preempt disabled so this routine must not
43 * sleep.  vmalloc can sleep so print_hook cannot resize the output buffer
44 * itself, instead it must set the required size and return to let the caller
45 * resize the buffer then redrive the SAL call.
46 */
47static int print_hook(const char *fmt, ...)
48{
49	char buf[400];
50	int len;
51	va_list args;
52	va_start(args, fmt);
53	vsnprintf(buf, sizeof(buf), fmt, args);
54	va_end(args);
55	len = strlen(buf);
56	if (*sn_oemdata_size + len <= sn_oemdata_bufsize)
57		memcpy(*sn_oemdata + *sn_oemdata_size, buf, len);
58	*sn_oemdata_size += len;
59	return 0;
60}
61
62static void sn_cpei_handler(int irq, void *devid, struct pt_regs *regs)
63{
64	/*
65	 * this function's sole purpose is to call SAL when we receive
66	 * a CE interrupt from SHUB or when the timer routine decides
67	 * we need to call SAL to check for CEs.
68	 */
69
70	/* CALL SAL_LOG_CE */
71
72	ia64_sn_plat_cpei_handler();
73}
74
75static void sn_cpei_timer_handler(unsigned long dummy)
76{
77	sn_cpei_handler(-1, NULL, NULL);
78	mod_timer(&sn_cpei_timer, jiffies + CPEI_INTERVAL);
79}
80
81void sn_init_cpei_timer(void)
82{
83	init_timer(&sn_cpei_timer);
84	sn_cpei_timer.expires = jiffies + CPEI_INTERVAL;
85	sn_cpei_timer.function = sn_cpei_timer_handler;
86	add_timer(&sn_cpei_timer);
87}
88
89static int
90sn_platform_plat_specific_err_print(const u8 * sect_header, u8 ** oemdata,
91				    u64 * oemdata_size)
92{
93	mutex_lock(&sn_oemdata_mutex);
94	sn_oemdata = oemdata;
95	sn_oemdata_size = oemdata_size;
96	sn_oemdata_bufsize = 0;
97	*sn_oemdata_size = PAGE_SIZE;	/* first guess at how much data will be generated */
98	while (*sn_oemdata_size > sn_oemdata_bufsize) {
99		u8 *newbuf = vmalloc(*sn_oemdata_size);
100		if (!newbuf) {
101			mutex_unlock(&sn_oemdata_mutex);
102			printk(KERN_ERR "%s: unable to extend sn_oemdata\n",
103			       __func__);
104			return 1;
105		}
106		vfree(*sn_oemdata);
107		*sn_oemdata = newbuf;
108		sn_oemdata_bufsize = *sn_oemdata_size;
109		*sn_oemdata_size = 0;
110		ia64_sn_plat_specific_err_print(print_hook, (char *)sect_header);
111	}
112	mutex_unlock(&sn_oemdata_mutex);
113	return 0;
114}
115
116/* Callback when userspace salinfo wants to decode oem data via the platform
117 * kernel and/or prom.
118 */
119int sn_salinfo_platform_oemdata(const u8 *sect_header, u8 **oemdata, u64 *oemdata_size)
120{
121	efi_guid_t guid = *(efi_guid_t *)sect_header;
122	int valid = 0;
123	*oemdata_size = 0;
124	vfree(*oemdata);
125	*oemdata = NULL;
126	if (efi_guidcmp(guid, SAL_PLAT_SPECIFIC_ERR_SECT_GUID) == 0) {
127		sal_log_plat_specific_err_info_t *psei = (sal_log_plat_specific_err_info_t *)sect_header;
128		valid = psei->valid.oem_data;
129	} else if (efi_guidcmp(guid, SAL_PLAT_MEM_DEV_ERR_SECT_GUID) == 0) {
130		sal_log_mem_dev_err_info_t *mdei = (sal_log_mem_dev_err_info_t *)sect_header;
131		valid = mdei->valid.oem_data;
132	}
133	if (valid)
134		return sn_platform_plat_specific_err_print(sect_header, oemdata, oemdata_size);
135	else
136		return 0;
137}
138
139static int __init sn_salinfo_init(void)
140{
141	if (ia64_platform_is("sn2"))
142		salinfo_platform_oemdata = &sn_salinfo_platform_oemdata;
143	return 0;
144}
145
146module_init(sn_salinfo_init)
147