Commit | Line | Data |
---|---|---|
6f05e69e | 1 | // SPDX-License-Identifier: GPL-1.0+ |
411ed322 MH |
2 | /* |
3 | * zcore module to export memory content and register sets for creating system | |
4 | * dumps on SCSI disks (zfcpdump). The "zcore/mem" debugfs file shows the same | |
5 | * dump format as s390 standalone dumps. | |
6 | * | |
7 | * For more information please refer to Documentation/s390/zfcpdump.txt | |
8 | * | |
a53c8fab | 9 | * Copyright IBM Corp. 2003, 2008 |
411ed322 MH |
10 | * Author(s): Michael Holzheu |
11 | */ | |
12 | ||
17159dc6 MH |
13 | #define KMSG_COMPONENT "zdump" |
14 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
15 | ||
411ed322 | 16 | #include <linux/init.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
411ed322 | 18 | #include <linux/debugfs.h> |
50be6345 PH |
19 | #include <linux/memblock.h> |
20 | ||
cbb870c8 | 21 | #include <asm/asm-offsets.h> |
411ed322 MH |
22 | #include <asm/ipl.h> |
23 | #include <asm/sclp.h> | |
24 | #include <asm/setup.h> | |
7c0f6ba6 | 25 | #include <linux/uaccess.h> |
411ed322 MH |
26 | #include <asm/debug.h> |
27 | #include <asm/processor.h> | |
28 | #include <asm/irqflags.h> | |
159d1ff8 | 29 | #include <asm/checksum.h> |
bbfed511 | 30 | #include <asm/os_info.h> |
a62bc073 | 31 | #include <asm/switch_to.h> |
763968e2 | 32 | #include "sclp.h" |
411ed322 MH |
33 | |
34 | #define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x) | |
411ed322 | 35 | |
12e0c95e | 36 | #define CHUNK_INFO_SIZE 34 /* 2 16-byte char, each followed by blank */ |
411ed322 MH |
37 | |
38 | enum arch_id { | |
39 | ARCH_S390 = 0, | |
40 | ARCH_S390X = 1, | |
41 | }; | |
42 | ||
099b7651 FM |
43 | struct ipib_info { |
44 | unsigned long ipib; | |
45 | u32 checksum; | |
46 | } __attribute__((packed)); | |
47 | ||
411ed322 MH |
48 | static struct debug_info *zcore_dbf; |
49 | static int hsa_available; | |
50 | static struct dentry *zcore_dir; | |
12e0c95e | 51 | static struct dentry *zcore_memmap_file; |
099b7651 | 52 | static struct dentry *zcore_reipl_file; |
b4b3d128 | 53 | static struct dentry *zcore_hsa_file; |
099b7651 | 54 | static struct ipl_parameter_block *ipl_block; |
411ed322 | 55 | |
019d6bec MS |
56 | static char hsa_buf[PAGE_SIZE] __aligned(PAGE_SIZE); |
57 | ||
411ed322 | 58 | /* |
019d6bec | 59 | * Copy memory from HSA to user memory (not reentrant): |
411ed322 | 60 | * |
019d6bec | 61 | * @dest: User buffer where memory should be copied to |
411ed322 MH |
62 | * @src: Start address within HSA where data should be copied |
63 | * @count: Size of buffer, which should be copied | |
411ed322 | 64 | */ |
019d6bec | 65 | int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count) |
411ed322 | 66 | { |
019d6bec | 67 | unsigned long offset, bytes; |
411ed322 | 68 | |
b4b3d128 MH |
69 | if (!hsa_available) |
70 | return -ENODATA; | |
411ed322 | 71 | |
019d6bec MS |
72 | while (count) { |
73 | if (sclp_sdias_copy(hsa_buf, src / PAGE_SIZE + 2, 1)) { | |
411ed322 MH |
74 | TRACE("sclp_sdias_copy() failed\n"); |
75 | return -EIO; | |
76 | } | |
019d6bec MS |
77 | offset = src % PAGE_SIZE; |
78 | bytes = min(PAGE_SIZE - offset, count); | |
79 | if (copy_to_user(dest, hsa_buf + offset, bytes)) | |
411ed322 | 80 | return -EFAULT; |
019d6bec MS |
81 | src += bytes; |
82 | dest += bytes; | |
83 | count -= bytes; | |
84 | } | |
411ed322 MH |
85 | return 0; |
86 | } | |
87 | ||
df9694c7 MS |
88 | /* |
89 | * Copy memory from HSA to kernel memory (not reentrant): | |
90 | * | |
91 | * @dest: Kernel or user buffer where memory should be copied to | |
92 | * @src: Start address within HSA where data should be copied | |
93 | * @count: Size of buffer, which should be copied | |
94 | */ | |
95 | int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count) | |
411ed322 | 96 | { |
019d6bec MS |
97 | unsigned long offset, bytes; |
98 | ||
99 | if (!hsa_available) | |
100 | return -ENODATA; | |
101 | ||
102 | while (count) { | |
103 | if (sclp_sdias_copy(hsa_buf, src / PAGE_SIZE + 2, 1)) { | |
104 | TRACE("sclp_sdias_copy() failed\n"); | |
105 | return -EIO; | |
106 | } | |
107 | offset = src % PAGE_SIZE; | |
108 | bytes = min(PAGE_SIZE - offset, count); | |
109 | memcpy(dest, hsa_buf + offset, bytes); | |
110 | src += bytes; | |
111 | dest += bytes; | |
112 | count -= bytes; | |
113 | } | |
114 | return 0; | |
411ed322 MH |
115 | } |
116 | ||
ffa52d02 | 117 | static int __init init_cpu_info(void) |
411ed322 | 118 | { |
1a2c5840 | 119 | struct save_area *sa; |
411ed322 MH |
120 | |
121 | /* get info for boot cpu from lowcore, stored in the HSA */ | |
1a2c5840 MS |
122 | sa = save_area_boot_cpu(); |
123 | if (!sa) | |
411ed322 | 124 | return -ENOMEM; |
1a2c5840 | 125 | if (memcpy_hsa_kernel(hsa_buf, __LC_FPREGS_SAVE_AREA, 512) < 0) { |
2a062ab4 | 126 | TRACE("could not copy from HSA\n"); |
411ed322 MH |
127 | return -EIO; |
128 | } | |
1a2c5840 | 129 | save_area_add_regs(sa, hsa_buf); /* vx registers are saved in smp.c */ |
411ed322 MH |
130 | return 0; |
131 | } | |
132 | ||
b4b3d128 MH |
133 | /* |
134 | * Release the HSA | |
135 | */ | |
136 | static void release_hsa(void) | |
137 | { | |
138 | diag308(DIAG308_REL_HSA, NULL); | |
139 | hsa_available = 0; | |
140 | } | |
141 | ||
12e0c95e FM |
142 | static ssize_t zcore_memmap_read(struct file *filp, char __user *buf, |
143 | size_t count, loff_t *ppos) | |
144 | { | |
145 | return simple_read_from_buffer(buf, count, ppos, filp->private_data, | |
50be6345 | 146 | memblock.memory.cnt * CHUNK_INFO_SIZE); |
12e0c95e FM |
147 | } |
148 | ||
149 | static int zcore_memmap_open(struct inode *inode, struct file *filp) | |
150 | { | |
50be6345 | 151 | struct memblock_region *reg; |
12e0c95e | 152 | char *buf; |
50be6345 | 153 | int i = 0; |
12e0c95e | 154 | |
6396bb22 | 155 | buf = kcalloc(memblock.memory.cnt, CHUNK_INFO_SIZE, GFP_KERNEL); |
12e0c95e | 156 | if (!buf) { |
12e0c95e FM |
157 | return -ENOMEM; |
158 | } | |
50be6345 PH |
159 | for_each_memblock(memory, reg) { |
160 | sprintf(buf + (i++ * CHUNK_INFO_SIZE), "%016llx %016llx ", | |
161 | (unsigned long long) reg->base, | |
162 | (unsigned long long) reg->size); | |
12e0c95e | 163 | } |
12e0c95e | 164 | filp->private_data = buf; |
58ea91c0 | 165 | return nonseekable_open(inode, filp); |
12e0c95e FM |
166 | } |
167 | ||
168 | static int zcore_memmap_release(struct inode *inode, struct file *filp) | |
169 | { | |
170 | kfree(filp->private_data); | |
171 | return 0; | |
172 | } | |
173 | ||
174 | static const struct file_operations zcore_memmap_fops = { | |
175 | .owner = THIS_MODULE, | |
176 | .read = zcore_memmap_read, | |
177 | .open = zcore_memmap_open, | |
178 | .release = zcore_memmap_release, | |
6038f373 | 179 | .llseek = no_llseek, |
12e0c95e FM |
180 | }; |
181 | ||
099b7651 FM |
182 | static ssize_t zcore_reipl_write(struct file *filp, const char __user *buf, |
183 | size_t count, loff_t *ppos) | |
184 | { | |
185 | if (ipl_block) { | |
186 | diag308(DIAG308_SET, ipl_block); | |
0599eead | 187 | diag308(DIAG308_LOAD_CLEAR, NULL); |
099b7651 FM |
188 | } |
189 | return count; | |
190 | } | |
191 | ||
192 | static int zcore_reipl_open(struct inode *inode, struct file *filp) | |
193 | { | |
58ea91c0 | 194 | return nonseekable_open(inode, filp); |
099b7651 FM |
195 | } |
196 | ||
197 | static int zcore_reipl_release(struct inode *inode, struct file *filp) | |
198 | { | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static const struct file_operations zcore_reipl_fops = { | |
203 | .owner = THIS_MODULE, | |
204 | .write = zcore_reipl_write, | |
205 | .open = zcore_reipl_open, | |
206 | .release = zcore_reipl_release, | |
6038f373 | 207 | .llseek = no_llseek, |
099b7651 FM |
208 | }; |
209 | ||
b4b3d128 MH |
210 | static ssize_t zcore_hsa_read(struct file *filp, char __user *buf, |
211 | size_t count, loff_t *ppos) | |
212 | { | |
213 | static char str[18]; | |
214 | ||
215 | if (hsa_available) | |
37c5f6c8 | 216 | snprintf(str, sizeof(str), "%lx\n", sclp.hsa_size); |
b4b3d128 MH |
217 | else |
218 | snprintf(str, sizeof(str), "0\n"); | |
219 | return simple_read_from_buffer(buf, count, ppos, str, strlen(str)); | |
220 | } | |
221 | ||
222 | static ssize_t zcore_hsa_write(struct file *filp, const char __user *buf, | |
223 | size_t count, loff_t *ppos) | |
224 | { | |
225 | char value; | |
226 | ||
227 | if (*ppos != 0) | |
228 | return -EPIPE; | |
229 | if (copy_from_user(&value, buf, 1)) | |
230 | return -EFAULT; | |
231 | if (value != '0') | |
232 | return -EINVAL; | |
233 | release_hsa(); | |
234 | return count; | |
235 | } | |
236 | ||
237 | static const struct file_operations zcore_hsa_fops = { | |
238 | .owner = THIS_MODULE, | |
239 | .write = zcore_hsa_write, | |
240 | .read = zcore_hsa_read, | |
241 | .open = nonseekable_open, | |
242 | .llseek = no_llseek, | |
243 | }; | |
244 | ||
411ed322 MH |
245 | static int __init check_sdias(void) |
246 | { | |
37c5f6c8 | 247 | if (!sclp.hsa_size) { |
2a062ab4 | 248 | TRACE("Could not determine HSA size\n"); |
e657d8fe | 249 | return -ENODEV; |
411ed322 MH |
250 | } |
251 | return 0; | |
252 | } | |
253 | ||
099b7651 FM |
254 | /* |
255 | * Provide IPL parameter information block from either HSA or memory | |
256 | * for future reipl | |
257 | */ | |
258 | static int __init zcore_reipl_init(void) | |
259 | { | |
260 | struct ipib_info ipib_info; | |
261 | int rc; | |
262 | ||
263 | rc = memcpy_hsa_kernel(&ipib_info, __LC_DUMP_REIPL, sizeof(ipib_info)); | |
264 | if (rc) | |
265 | return rc; | |
266 | if (ipib_info.ipib == 0) | |
267 | return 0; | |
268 | ipl_block = (void *) __get_free_page(GFP_KERNEL); | |
269 | if (!ipl_block) | |
270 | return -ENOMEM; | |
37c5f6c8 | 271 | if (ipib_info.ipib < sclp.hsa_size) |
099b7651 FM |
272 | rc = memcpy_hsa_kernel(ipl_block, ipib_info.ipib, PAGE_SIZE); |
273 | else | |
92fe3132 | 274 | rc = memcpy_real(ipl_block, (void *) ipib_info.ipib, PAGE_SIZE); |
90b3baa2 | 275 | if (rc || (__force u32)csum_partial(ipl_block, ipl_block->hdr.len, 0) != |
159d1ff8 | 276 | ipib_info.checksum) { |
099b7651 FM |
277 | TRACE("Checksum does not match\n"); |
278 | free_page((unsigned long) ipl_block); | |
279 | ipl_block = NULL; | |
280 | } | |
281 | return 0; | |
282 | } | |
283 | ||
411ed322 MH |
284 | static int __init zcore_init(void) |
285 | { | |
286 | unsigned char arch; | |
287 | int rc; | |
288 | ||
289 | if (ipl_info.type != IPL_TYPE_FCP_DUMP) | |
290 | return -ENODATA; | |
3f25dc4f MH |
291 | if (OLDMEM_BASE) |
292 | return -ENODATA; | |
411ed322 MH |
293 | |
294 | zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long)); | |
295 | debug_register_view(zcore_dbf, &debug_sprintf_view); | |
296 | debug_set_level(zcore_dbf, 6); | |
297 | ||
298 | TRACE("devno: %x\n", ipl_info.data.fcp.dev_id.devno); | |
299 | TRACE("wwpn: %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn); | |
300 | TRACE("lun: %llx\n", (unsigned long long) ipl_info.data.fcp.lun); | |
301 | ||
763968e2 | 302 | rc = sclp_sdias_init(); |
411ed322 MH |
303 | if (rc) |
304 | goto fail; | |
305 | ||
306 | rc = check_sdias(); | |
2a062ab4 | 307 | if (rc) |
411ed322 | 308 | goto fail; |
b4b3d128 | 309 | hsa_available = 1; |
411ed322 MH |
310 | |
311 | rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1); | |
2a062ab4 | 312 | if (rc) |
411ed322 | 313 | goto fail; |
411ed322 | 314 | |
f64ca217 HC |
315 | if (arch == ARCH_S390) { |
316 | pr_alert("The 64-bit dump tool cannot be used for a " | |
317 | "32-bit system\n"); | |
318 | rc = -EINVAL; | |
319 | goto fail; | |
320 | } | |
411ed322 | 321 | |
68962269 | 322 | pr_alert("The dump process started for a 64-bit operating system\n"); |
ffa52d02 | 323 | rc = init_cpu_info(); |
2a062ab4 | 324 | if (rc) |
411ed322 | 325 | goto fail; |
411ed322 | 326 | |
099b7651 FM |
327 | rc = zcore_reipl_init(); |
328 | if (rc) | |
329 | goto fail; | |
330 | ||
411ed322 MH |
331 | zcore_dir = debugfs_create_dir("zcore" , NULL); |
332 | if (!zcore_dir) { | |
333 | rc = -ENOMEM; | |
334 | goto fail; | |
335 | } | |
12e0c95e FM |
336 | zcore_memmap_file = debugfs_create_file("memmap", S_IRUSR, zcore_dir, |
337 | NULL, &zcore_memmap_fops); | |
338 | if (!zcore_memmap_file) { | |
339 | rc = -ENOMEM; | |
ffa52d02 | 340 | goto fail_dir; |
411ed322 | 341 | } |
099b7651 FM |
342 | zcore_reipl_file = debugfs_create_file("reipl", S_IRUSR, zcore_dir, |
343 | NULL, &zcore_reipl_fops); | |
344 | if (!zcore_reipl_file) { | |
345 | rc = -ENOMEM; | |
346 | goto fail_memmap_file; | |
347 | } | |
b4b3d128 MH |
348 | zcore_hsa_file = debugfs_create_file("hsa", S_IRUSR|S_IWUSR, zcore_dir, |
349 | NULL, &zcore_hsa_fops); | |
350 | if (!zcore_hsa_file) { | |
351 | rc = -ENOMEM; | |
352 | goto fail_reipl_file; | |
353 | } | |
411ed322 MH |
354 | return 0; |
355 | ||
b4b3d128 MH |
356 | fail_reipl_file: |
357 | debugfs_remove(zcore_reipl_file); | |
099b7651 FM |
358 | fail_memmap_file: |
359 | debugfs_remove(zcore_memmap_file); | |
12e0c95e FM |
360 | fail_dir: |
361 | debugfs_remove(zcore_dir); | |
411ed322 MH |
362 | fail: |
363 | diag308(DIAG308_REL_HSA, NULL); | |
364 | return rc; | |
365 | } | |
411ed322 | 366 | subsys_initcall(zcore_init); |