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
25 struct timer_list sn_cpei_timer;
26 void 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 */
31 static DEFINE_MUTEX(sn_oemdata_mutex);
32 static u8 **sn_oemdata;
33 static 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 */
print_hook(const char * fmt,...)47 static 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
sn_cpei_handler(int irq,void * devid,struct pt_regs * regs)62 static 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
sn_cpei_timer_handler(unsigned long dummy)75 static 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
sn_init_cpei_timer(void)81 void 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
89 static int
sn_platform_plat_specific_err_print(const u8 * sect_header,u8 ** oemdata,u64 * oemdata_size)90 sn_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 */
sn_salinfo_platform_oemdata(const u8 * sect_header,u8 ** oemdata,u64 * oemdata_size)119 int 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
sn_salinfo_init(void)139 static 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
146 module_init(sn_salinfo_init)
147