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) 1999,2001-2004, 2006 Silicon Graphics, Inc. All Rights Reserved.
7 *
8 * Module to export the system's Firmware Interface Tables, including
9 * PROM revision numbers and banners, in /proc
10 */
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/proc_fs.h>
14 #include <linux/nodemask.h>
15 #include <asm/system.h>
16 #include <asm/io.h>
17 #include <asm/sn/sn_sal.h>
18 #include <asm/sn/sn_cpuid.h>
19 #include <asm/sn/addrs.h>
20
21 MODULE_DESCRIPTION("PROM version reporting for /proc");
22 MODULE_AUTHOR("Chad Talbott");
23 MODULE_LICENSE("GPL");
24
25 /* Standard Intel FIT entry types */
26 #define FIT_ENTRY_FIT_HEADER 0x00 /* FIT header entry */
27 #define FIT_ENTRY_PAL_B 0x01 /* PAL_B entry */
28 /* Entries 0x02 through 0x0D reserved by Intel */
29 #define FIT_ENTRY_PAL_A_PROC 0x0E /* Processor-specific PAL_A entry */
30 #define FIT_ENTRY_PAL_A 0x0F /* PAL_A entry, same as... */
31 #define FIT_ENTRY_PAL_A_GEN 0x0F /* ...Generic PAL_A entry */
32 #define FIT_ENTRY_UNUSED 0x7F /* Unused (reserved by Intel?) */
33 /* OEM-defined entries range from 0x10 to 0x7E. */
34 #define FIT_ENTRY_SAL_A 0x10 /* SAL_A entry */
35 #define FIT_ENTRY_SAL_B 0x11 /* SAL_B entry */
36 #define FIT_ENTRY_SALRUNTIME 0x12 /* SAL runtime entry */
37 #define FIT_ENTRY_EFI 0x1F /* EFI entry */
38 #define FIT_ENTRY_FPSWA 0x20 /* embedded fpswa entry */
39 #define FIT_ENTRY_VMLINUX 0x21 /* embedded vmlinux entry */
40
41 #define FIT_MAJOR_SHIFT (32 + 8)
42 #define FIT_MAJOR_MASK ((1 << 8) - 1)
43 #define FIT_MINOR_SHIFT 32
44 #define FIT_MINOR_MASK ((1 << 8) - 1)
45
46 #define FIT_MAJOR(q) \
47 ((unsigned) ((q) >> FIT_MAJOR_SHIFT) & FIT_MAJOR_MASK)
48 #define FIT_MINOR(q) \
49 ((unsigned) ((q) >> FIT_MINOR_SHIFT) & FIT_MINOR_MASK)
50
51 #define FIT_TYPE_SHIFT (32 + 16)
52 #define FIT_TYPE_MASK ((1 << 7) - 1)
53
54 #define FIT_TYPE(q) \
55 ((unsigned) ((q) >> FIT_TYPE_SHIFT) & FIT_TYPE_MASK)
56
57 struct fit_type_map_t {
58 unsigned char type;
59 const char *name;
60 };
61
62 static const struct fit_type_map_t fit_entry_types[] = {
63 {FIT_ENTRY_FIT_HEADER, "FIT Header"},
64 {FIT_ENTRY_PAL_A_GEN, "Generic PAL_A"},
65 {FIT_ENTRY_PAL_A_PROC, "Processor-specific PAL_A"},
66 {FIT_ENTRY_PAL_A, "PAL_A"},
67 {FIT_ENTRY_PAL_B, "PAL_B"},
68 {FIT_ENTRY_SAL_A, "SAL_A"},
69 {FIT_ENTRY_SAL_B, "SAL_B"},
70 {FIT_ENTRY_SALRUNTIME, "SAL runtime"},
71 {FIT_ENTRY_EFI, "EFI"},
72 {FIT_ENTRY_VMLINUX, "Embedded Linux"},
73 {FIT_ENTRY_FPSWA, "Embedded FPSWA"},
74 {FIT_ENTRY_UNUSED, "Unused"},
75 {0xff, "Error"},
76 };
77
fit_type_name(unsigned char type)78 static const char *fit_type_name(unsigned char type)
79 {
80 struct fit_type_map_t const *mapp;
81
82 for (mapp = fit_entry_types; mapp->type != 0xff; mapp++)
83 if (type == mapp->type)
84 return mapp->name;
85
86 if ((type > FIT_ENTRY_PAL_A) && (type < FIT_ENTRY_UNUSED))
87 return "OEM type";
88 if ((type > FIT_ENTRY_PAL_B) && (type < FIT_ENTRY_PAL_A))
89 return "Reserved";
90
91 return "Unknown type";
92 }
93
94 static int
get_fit_entry(unsigned long nasid,int index,unsigned long * fentry,char * banner,int banlen)95 get_fit_entry(unsigned long nasid, int index, unsigned long *fentry,
96 char *banner, int banlen)
97 {
98 return ia64_sn_get_fit_compt(nasid, index, fentry, banner, banlen);
99 }
100
101
102 /*
103 * These two routines display the FIT table for each node.
104 */
dump_fit_entry(char * page,unsigned long * fentry)105 static int dump_fit_entry(char *page, unsigned long *fentry)
106 {
107 unsigned type;
108
109 type = FIT_TYPE(fentry[1]);
110 return sprintf(page, "%02x %-25s %x.%02x %016lx %u\n",
111 type,
112 fit_type_name(type),
113 FIT_MAJOR(fentry[1]), FIT_MINOR(fentry[1]),
114 fentry[0],
115 /* mult by sixteen to get size in bytes */
116 (unsigned)(fentry[1] & 0xffffff) * 16);
117 }
118
119
120 /*
121 * We assume that the fit table will be small enough that we can print
122 * the whole thing into one page. (This is true for our default 16kB
123 * pages -- each entry is about 60 chars wide when printed.) I read
124 * somewhere that the maximum size of the FIT is 128 entries, so we're
125 * OK except for 4kB pages (and no one is going to do that on SN
126 * anyway).
127 */
128 static int
dump_fit(char * page,unsigned long nasid)129 dump_fit(char *page, unsigned long nasid)
130 {
131 unsigned long fentry[2];
132 int index;
133 char *p;
134
135 p = page;
136 for (index=0;;index++) {
137 BUG_ON(index * 60 > PAGE_SIZE);
138 if (get_fit_entry(nasid, index, fentry, NULL, 0))
139 break;
140 p += dump_fit_entry(p, fentry);
141 }
142
143 return p - page;
144 }
145
146 static int
dump_version(char * page,unsigned long nasid)147 dump_version(char *page, unsigned long nasid)
148 {
149 unsigned long fentry[2];
150 char banner[128];
151 int index;
152 int len;
153
154 for (index = 0; ; index++) {
155 if (get_fit_entry(nasid, index, fentry, banner,
156 sizeof(banner)))
157 return 0;
158 if (FIT_TYPE(fentry[1]) == FIT_ENTRY_SAL_A)
159 break;
160 }
161
162 len = sprintf(page, "%x.%02x\n", FIT_MAJOR(fentry[1]),
163 FIT_MINOR(fentry[1]));
164 page += len;
165
166 if (banner[0])
167 len += snprintf(page, PAGE_SIZE-len, "%s\n", banner);
168
169 return len;
170 }
171
172 /* same as in proc_misc.c */
173 static int
proc_calc_metrics(char * page,char ** start,off_t off,int count,int * eof,int len)174 proc_calc_metrics(char *page, char **start, off_t off, int count, int *eof,
175 int len)
176 {
177 if (len <= off + count)
178 *eof = 1;
179 *start = page + off;
180 len -= off;
181 if (len > count)
182 len = count;
183 if (len < 0)
184 len = 0;
185 return len;
186 }
187
188 static int
read_version_entry(char * page,char ** start,off_t off,int count,int * eof,void * data)189 read_version_entry(char *page, char **start, off_t off, int count, int *eof,
190 void *data)
191 {
192 int len;
193
194 /* data holds the NASID of the node */
195 len = dump_version(page, (unsigned long)data);
196 len = proc_calc_metrics(page, start, off, count, eof, len);
197 return len;
198 }
199
200 static int
read_fit_entry(char * page,char ** start,off_t off,int count,int * eof,void * data)201 read_fit_entry(char *page, char **start, off_t off, int count, int *eof,
202 void *data)
203 {
204 int len;
205
206 /* data holds the NASID of the node */
207 len = dump_fit(page, (unsigned long)data);
208 len = proc_calc_metrics(page, start, off, count, eof, len);
209
210 return len;
211 }
212
213 /* module entry points */
214 int __init prominfo_init(void);
215 void __exit prominfo_exit(void);
216
217 module_init(prominfo_init);
218 module_exit(prominfo_exit);
219
220 static struct proc_dir_entry **proc_entries;
221 static struct proc_dir_entry *sgi_prominfo_entry;
222
223 #define NODE_NAME_LEN 11
224
prominfo_init(void)225 int __init prominfo_init(void)
226 {
227 struct proc_dir_entry **entp;
228 cnodeid_t cnodeid;
229 unsigned long nasid;
230 int size;
231 char name[NODE_NAME_LEN];
232
233 if (!ia64_platform_is("sn2"))
234 return 0;
235
236 size = num_online_nodes() * sizeof(struct proc_dir_entry *);
237 proc_entries = kzalloc(size, GFP_KERNEL);
238 if (!proc_entries)
239 return -ENOMEM;
240
241 sgi_prominfo_entry = proc_mkdir("sgi_prominfo", NULL);
242
243 entp = proc_entries;
244 for_each_online_node(cnodeid) {
245 sprintf(name, "node%d", cnodeid);
246 *entp = proc_mkdir(name, sgi_prominfo_entry);
247 nasid = cnodeid_to_nasid(cnodeid);
248 create_proc_read_entry("fit", 0, *entp, read_fit_entry,
249 (void *)nasid);
250 create_proc_read_entry("version", 0, *entp,
251 read_version_entry, (void *)nasid);
252 entp++;
253 }
254
255 return 0;
256 }
257
prominfo_exit(void)258 void __exit prominfo_exit(void)
259 {
260 struct proc_dir_entry **entp;
261 unsigned int cnodeid;
262 char name[NODE_NAME_LEN];
263
264 entp = proc_entries;
265 for_each_online_node(cnodeid) {
266 remove_proc_entry("fit", *entp);
267 remove_proc_entry("version", *entp);
268 sprintf(name, "node%d", cnodeid);
269 remove_proc_entry(name, sgi_prominfo_entry);
270 entp++;
271 }
272 remove_proc_entry("sgi_prominfo", NULL);
273 kfree(proc_entries);
274 }
275