Commit | Line | Data |
---|---|---|
411ed322 MH |
1 | /* |
2 | * zcore module to export memory content and register sets for creating system | |
3 | * dumps on SCSI disks (zfcpdump). The "zcore/mem" debugfs file shows the same | |
4 | * dump format as s390 standalone dumps. | |
5 | * | |
6 | * For more information please refer to Documentation/s390/zfcpdump.txt | |
7 | * | |
a53c8fab | 8 | * Copyright IBM Corp. 2003, 2008 |
411ed322 MH |
9 | * Author(s): Michael Holzheu |
10 | */ | |
11 | ||
17159dc6 MH |
12 | #define KMSG_COMPONENT "zdump" |
13 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
14 | ||
411ed322 | 15 | #include <linux/init.h> |
5a0e3ad6 | 16 | #include <linux/slab.h> |
411ed322 | 17 | #include <linux/miscdevice.h> |
411ed322 | 18 | #include <linux/debugfs.h> |
3948a102 | 19 | #include <linux/module.h> |
50be6345 PH |
20 | #include <linux/memblock.h> |
21 | ||
cbb870c8 | 22 | #include <asm/asm-offsets.h> |
411ed322 MH |
23 | #include <asm/ipl.h> |
24 | #include <asm/sclp.h> | |
25 | #include <asm/setup.h> | |
411ed322 MH |
26 | #include <asm/uaccess.h> |
27 | #include <asm/debug.h> | |
28 | #include <asm/processor.h> | |
29 | #include <asm/irqflags.h> | |
159d1ff8 | 30 | #include <asm/checksum.h> |
bbfed511 | 31 | #include <asm/os_info.h> |
a62bc073 | 32 | #include <asm/switch_to.h> |
763968e2 | 33 | #include "sclp.h" |
411ed322 MH |
34 | |
35 | #define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x) | |
411ed322 | 36 | |
12e0c95e | 37 | #define CHUNK_INFO_SIZE 34 /* 2 16-byte char, each followed by blank */ |
411ed322 MH |
38 | |
39 | enum arch_id { | |
40 | ARCH_S390 = 0, | |
41 | ARCH_S390X = 1, | |
42 | }; | |
43 | ||
099b7651 FM |
44 | struct ipib_info { |
45 | unsigned long ipib; | |
46 | u32 checksum; | |
47 | } __attribute__((packed)); | |
48 | ||
411ed322 MH |
49 | static struct debug_info *zcore_dbf; |
50 | static int hsa_available; | |
51 | static struct dentry *zcore_dir; | |
12e0c95e | 52 | static struct dentry *zcore_memmap_file; |
099b7651 | 53 | static struct dentry *zcore_reipl_file; |
b4b3d128 | 54 | static struct dentry *zcore_hsa_file; |
099b7651 | 55 | static struct ipl_parameter_block *ipl_block; |
411ed322 | 56 | |
019d6bec MS |
57 | static char hsa_buf[PAGE_SIZE] __aligned(PAGE_SIZE); |
58 | ||
411ed322 | 59 | /* |
019d6bec | 60 | * Copy memory from HSA to user memory (not reentrant): |
411ed322 | 61 | * |
019d6bec | 62 | * @dest: User buffer where memory should be copied to |
411ed322 MH |
63 | * @src: Start address within HSA where data should be copied |
64 | * @count: Size of buffer, which should be copied | |
411ed322 | 65 | */ |
019d6bec | 66 | int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count) |
411ed322 | 67 | { |
019d6bec | 68 | unsigned long offset, bytes; |
411ed322 | 69 | |
b4b3d128 MH |
70 | if (!hsa_available) |
71 | return -ENODATA; | |
411ed322 | 72 | |
019d6bec MS |
73 | while (count) { |
74 | if (sclp_sdias_copy(hsa_buf, src / PAGE_SIZE + 2, 1)) { | |
411ed322 MH |
75 | TRACE("sclp_sdias_copy() failed\n"); |
76 | return -EIO; | |
77 | } | |
019d6bec MS |
78 | offset = src % PAGE_SIZE; |
79 | bytes = min(PAGE_SIZE - offset, count); | |
80 | if (copy_to_user(dest, hsa_buf + offset, bytes)) | |
411ed322 | 81 | return -EFAULT; |
019d6bec MS |
82 | src += bytes; |
83 | dest += bytes; | |
84 | count -= bytes; | |
85 | } | |
411ed322 MH |
86 | return 0; |
87 | } | |
88 | ||
df9694c7 MS |
89 | /* |
90 | * Copy memory from HSA to kernel memory (not reentrant): | |
91 | * | |
92 | * @dest: Kernel or user buffer where memory should be copied to | |
93 | * @src: Start address within HSA where data should be copied | |
94 | * @count: Size of buffer, which should be copied | |
95 | */ | |
96 | int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count) | |
411ed322 | 97 | { |
019d6bec MS |
98 | unsigned long offset, bytes; |
99 | ||
100 | if (!hsa_available) | |
101 | return -ENODATA; | |
102 | ||
103 | while (count) { | |
104 | if (sclp_sdias_copy(hsa_buf, src / PAGE_SIZE + 2, 1)) { | |
105 | TRACE("sclp_sdias_copy() failed\n"); | |
106 | return -EIO; | |
107 | } | |
108 | offset = src % PAGE_SIZE; | |
109 | bytes = min(PAGE_SIZE - offset, count); | |
110 | memcpy(dest, hsa_buf + offset, bytes); | |
111 | src += bytes; | |
112 | dest += bytes; | |
113 | count -= bytes; | |
114 | } | |
115 | return 0; | |
411ed322 MH |
116 | } |
117 | ||
ffa52d02 | 118 | static int __init init_cpu_info(void) |
411ed322 | 119 | { |
1a2c5840 | 120 | struct save_area *sa; |
411ed322 MH |
121 | |
122 | /* get info for boot cpu from lowcore, stored in the HSA */ | |
1a2c5840 MS |
123 | sa = save_area_boot_cpu(); |
124 | if (!sa) | |
411ed322 | 125 | return -ENOMEM; |
1a2c5840 | 126 | if (memcpy_hsa_kernel(hsa_buf, __LC_FPREGS_SAVE_AREA, 512) < 0) { |
2a062ab4 | 127 | TRACE("could not copy from HSA\n"); |
411ed322 MH |
128 | return -EIO; |
129 | } | |
1a2c5840 | 130 | save_area_add_regs(sa, hsa_buf); /* vx registers are saved in smp.c */ |
411ed322 MH |
131 | return 0; |
132 | } | |
133 | ||
b4b3d128 MH |
134 | /* |
135 | * Release the HSA | |
136 | */ | |
137 | static void release_hsa(void) | |
138 | { | |
139 | diag308(DIAG308_REL_HSA, NULL); | |
140 | hsa_available = 0; | |
141 | } | |
142 | ||
12e0c95e FM |
143 | static ssize_t zcore_memmap_read(struct file *filp, char __user *buf, |
144 | size_t count, loff_t *ppos) | |
145 | { | |
146 | return simple_read_from_buffer(buf, count, ppos, filp->private_data, | |
50be6345 | 147 | memblock.memory.cnt * CHUNK_INFO_SIZE); |
12e0c95e FM |
148 | } |
149 | ||
150 | static int zcore_memmap_open(struct inode *inode, struct file *filp) | |
151 | { | |
50be6345 | 152 | struct memblock_region *reg; |
12e0c95e | 153 | char *buf; |
50be6345 | 154 | int i = 0; |
12e0c95e | 155 | |
50be6345 | 156 | buf = kzalloc(memblock.memory.cnt * CHUNK_INFO_SIZE, GFP_KERNEL); |
12e0c95e | 157 | if (!buf) { |
12e0c95e FM |
158 | return -ENOMEM; |
159 | } | |
50be6345 PH |
160 | for_each_memblock(memory, reg) { |
161 | sprintf(buf + (i++ * CHUNK_INFO_SIZE), "%016llx %016llx ", | |
162 | (unsigned long long) reg->base, | |
163 | (unsigned long long) reg->size); | |
12e0c95e | 164 | } |
12e0c95e | 165 | filp->private_data = buf; |
58ea91c0 | 166 | return nonseekable_open(inode, filp); |
12e0c95e FM |
167 | } |
168 | ||
169 | static int zcore_memmap_release(struct inode *inode, struct file *filp) | |
170 | { | |
171 | kfree(filp->private_data); | |
172 | return 0; | |
173 | } | |
174 | ||
175 | static const struct file_operations zcore_memmap_fops = { | |
176 | .owner = THIS_MODULE, | |
177 | .read = zcore_memmap_read, | |
178 | .open = zcore_memmap_open, | |
179 | .release = zcore_memmap_release, | |
6038f373 | 180 | .llseek = no_llseek, |
12e0c95e FM |
181 | }; |
182 | ||
099b7651 FM |
183 | static ssize_t zcore_reipl_write(struct file *filp, const char __user *buf, |
184 | size_t count, loff_t *ppos) | |
185 | { | |
186 | if (ipl_block) { | |
187 | diag308(DIAG308_SET, ipl_block); | |
0599eead | 188 | diag308(DIAG308_LOAD_CLEAR, NULL); |
099b7651 FM |
189 | } |
190 | return count; | |
191 | } | |
192 | ||
193 | static int zcore_reipl_open(struct inode *inode, struct file *filp) | |
194 | { | |
58ea91c0 | 195 | return nonseekable_open(inode, filp); |
099b7651 FM |
196 | } |
197 | ||
198 | static int zcore_reipl_release(struct inode *inode, struct file *filp) | |
199 | { | |
200 | return 0; | |
201 | } | |
202 | ||
203 | static const struct file_operations zcore_reipl_fops = { | |
204 | .owner = THIS_MODULE, | |
205 | .write = zcore_reipl_write, | |
206 | .open = zcore_reipl_open, | |
207 | .release = zcore_reipl_release, | |
6038f373 | 208 | .llseek = no_llseek, |
099b7651 FM |
209 | }; |
210 | ||
b4b3d128 MH |
211 | static ssize_t zcore_hsa_read(struct file *filp, char __user *buf, |
212 | size_t count, loff_t *ppos) | |
213 | { | |
214 | static char str[18]; | |
215 | ||
216 | if (hsa_available) | |
37c5f6c8 | 217 | snprintf(str, sizeof(str), "%lx\n", sclp.hsa_size); |
b4b3d128 MH |
218 | else |
219 | snprintf(str, sizeof(str), "0\n"); | |
220 | return simple_read_from_buffer(buf, count, ppos, str, strlen(str)); | |
221 | } | |
222 | ||
223 | static ssize_t zcore_hsa_write(struct file *filp, const char __user *buf, | |
224 | size_t count, loff_t *ppos) | |
225 | { | |
226 | char value; | |
227 | ||
228 | if (*ppos != 0) | |
229 | return -EPIPE; | |
230 | if (copy_from_user(&value, buf, 1)) | |
231 | return -EFAULT; | |
232 | if (value != '0') | |
233 | return -EINVAL; | |
234 | release_hsa(); | |
235 | return count; | |
236 | } | |
237 | ||
238 | static const struct file_operations zcore_hsa_fops = { | |
239 | .owner = THIS_MODULE, | |
240 | .write = zcore_hsa_write, | |
241 | .read = zcore_hsa_read, | |
242 | .open = nonseekable_open, | |
243 | .llseek = no_llseek, | |
244 | }; | |
245 | ||
411ed322 MH |
246 | static int __init check_sdias(void) |
247 | { | |
37c5f6c8 | 248 | if (!sclp.hsa_size) { |
2a062ab4 | 249 | TRACE("Could not determine HSA size\n"); |
e657d8fe | 250 | return -ENODEV; |
411ed322 MH |
251 | } |
252 | return 0; | |
253 | } | |
254 | ||
099b7651 FM |
255 | /* |
256 | * Provide IPL parameter information block from either HSA or memory | |
257 | * for future reipl | |
258 | */ | |
259 | static int __init zcore_reipl_init(void) | |
260 | { | |
261 | struct ipib_info ipib_info; | |
262 | int rc; | |
263 | ||
264 | rc = memcpy_hsa_kernel(&ipib_info, __LC_DUMP_REIPL, sizeof(ipib_info)); | |
265 | if (rc) | |
266 | return rc; | |
267 | if (ipib_info.ipib == 0) | |
268 | return 0; | |
269 | ipl_block = (void *) __get_free_page(GFP_KERNEL); | |
270 | if (!ipl_block) | |
271 | return -ENOMEM; | |
37c5f6c8 | 272 | if (ipib_info.ipib < sclp.hsa_size) |
099b7651 FM |
273 | rc = memcpy_hsa_kernel(ipl_block, ipib_info.ipib, PAGE_SIZE); |
274 | else | |
92fe3132 | 275 | rc = memcpy_real(ipl_block, (void *) ipib_info.ipib, PAGE_SIZE); |
76ef964c | 276 | if (rc || csum_partial(ipl_block, ipl_block->hdr.len, 0) != |
159d1ff8 | 277 | ipib_info.checksum) { |
099b7651 FM |
278 | TRACE("Checksum does not match\n"); |
279 | free_page((unsigned long) ipl_block); | |
280 | ipl_block = NULL; | |
281 | } | |
282 | return 0; | |
283 | } | |
284 | ||
411ed322 MH |
285 | static int __init zcore_init(void) |
286 | { | |
287 | unsigned char arch; | |
288 | int rc; | |
289 | ||
290 | if (ipl_info.type != IPL_TYPE_FCP_DUMP) | |
291 | return -ENODATA; | |
3f25dc4f MH |
292 | if (OLDMEM_BASE) |
293 | return -ENODATA; | |
411ed322 MH |
294 | |
295 | zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long)); | |
296 | debug_register_view(zcore_dbf, &debug_sprintf_view); | |
297 | debug_set_level(zcore_dbf, 6); | |
298 | ||
299 | TRACE("devno: %x\n", ipl_info.data.fcp.dev_id.devno); | |
300 | TRACE("wwpn: %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn); | |
301 | TRACE("lun: %llx\n", (unsigned long long) ipl_info.data.fcp.lun); | |
302 | ||
763968e2 | 303 | rc = sclp_sdias_init(); |
411ed322 MH |
304 | if (rc) |
305 | goto fail; | |
306 | ||
307 | rc = check_sdias(); | |
2a062ab4 | 308 | if (rc) |
411ed322 | 309 | goto fail; |
b4b3d128 | 310 | hsa_available = 1; |
411ed322 MH |
311 | |
312 | rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1); | |
2a062ab4 | 313 | if (rc) |
411ed322 | 314 | goto fail; |
411ed322 | 315 | |
f64ca217 HC |
316 | if (arch == ARCH_S390) { |
317 | pr_alert("The 64-bit dump tool cannot be used for a " | |
318 | "32-bit system\n"); | |
319 | rc = -EINVAL; | |
320 | goto fail; | |
321 | } | |
411ed322 | 322 | |
ffa52d02 MS |
323 | pr_alert("DETECTED 'S390X (64 bit) OS'\n"); |
324 | rc = init_cpu_info(); | |
2a062ab4 | 325 | if (rc) |
411ed322 | 326 | goto fail; |
411ed322 | 327 | |
099b7651 FM |
328 | rc = zcore_reipl_init(); |
329 | if (rc) | |
330 | goto fail; | |
331 | ||
411ed322 MH |
332 | zcore_dir = debugfs_create_dir("zcore" , NULL); |
333 | if (!zcore_dir) { | |
334 | rc = -ENOMEM; | |
335 | goto fail; | |
336 | } | |
12e0c95e FM |
337 | zcore_memmap_file = debugfs_create_file("memmap", S_IRUSR, zcore_dir, |
338 | NULL, &zcore_memmap_fops); | |
339 | if (!zcore_memmap_file) { | |
340 | rc = -ENOMEM; | |
ffa52d02 | 341 | goto fail_dir; |
411ed322 | 342 | } |
099b7651 FM |
343 | zcore_reipl_file = debugfs_create_file("reipl", S_IRUSR, zcore_dir, |
344 | NULL, &zcore_reipl_fops); | |
345 | if (!zcore_reipl_file) { | |
346 | rc = -ENOMEM; | |
347 | goto fail_memmap_file; | |
348 | } | |
b4b3d128 MH |
349 | zcore_hsa_file = debugfs_create_file("hsa", S_IRUSR|S_IWUSR, zcore_dir, |
350 | NULL, &zcore_hsa_fops); | |
351 | if (!zcore_hsa_file) { | |
352 | rc = -ENOMEM; | |
353 | goto fail_reipl_file; | |
354 | } | |
411ed322 MH |
355 | return 0; |
356 | ||
b4b3d128 MH |
357 | fail_reipl_file: |
358 | debugfs_remove(zcore_reipl_file); | |
099b7651 FM |
359 | fail_memmap_file: |
360 | debugfs_remove(zcore_memmap_file); | |
12e0c95e FM |
361 | fail_dir: |
362 | debugfs_remove(zcore_dir); | |
411ed322 MH |
363 | fail: |
364 | diag308(DIAG308_REL_HSA, NULL); | |
365 | return rc; | |
366 | } | |
367 | ||
411ed322 MH |
368 | static void __exit zcore_exit(void) |
369 | { | |
370 | debug_unregister(zcore_dbf); | |
763968e2 | 371 | sclp_sdias_exit(); |
099b7651 | 372 | free_page((unsigned long) ipl_block); |
b4b3d128 | 373 | debugfs_remove(zcore_hsa_file); |
099b7651 FM |
374 | debugfs_remove(zcore_reipl_file); |
375 | debugfs_remove(zcore_memmap_file); | |
099b7651 | 376 | debugfs_remove(zcore_dir); |
411ed322 MH |
377 | diag308(DIAG308_REL_HSA, NULL); |
378 | } | |
379 | ||
099b7651 | 380 | MODULE_AUTHOR("Copyright IBM Corp. 2003,2008"); |
411ed322 MH |
381 | MODULE_DESCRIPTION("zcore module for zfcpdump support"); |
382 | MODULE_LICENSE("GPL"); | |
383 | ||
384 | subsys_initcall(zcore_init); | |
385 | module_exit(zcore_exit); |