Commit | Line | Data |
---|---|---|
b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
886d51a3 | 3 | * wrapper/vmalloc.h |
6d2a620c MD |
4 | * |
5 | * wrapper around vmalloc_sync_all. Using KALLSYMS to get its address when | |
6 | * available, else we need to have a kernel that exports this function to GPL | |
7 | * modules. | |
8 | * | |
886d51a3 | 9 | * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
6d2a620c MD |
10 | */ |
11 | ||
9f36eaed MJ |
12 | #ifndef _LTTNG_WRAPPER_VMALLOC_H |
13 | #define _LTTNG_WRAPPER_VMALLOC_H | |
14 | ||
5f4c791e | 15 | #include <lttng/kernel-version.h> |
48f5e0b5 | 16 | #include <linux/vmalloc.h> |
533556cd | 17 | #include <linux/slab.h> |
01ab5113 | 18 | #include <linux/mm.h> |
48f5e0b5 | 19 | |
6d2a620c MD |
20 | #ifdef CONFIG_KALLSYMS |
21 | ||
22 | #include <linux/kallsyms.h> | |
5a2f5e92 | 23 | #include <wrapper/kallsyms.h> |
2b3dbafc | 24 | #include <lttng/kernel-version.h> |
6d2a620c | 25 | |
5f4c791e | 26 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,8,0)) |
0dcc94fa MJ |
27 | |
28 | /* | |
29 | * wrapper_vmalloc_sync_mappings was removed in v5.8, the vmalloc mappings | |
30 | * are now synchronized when they are created or torn down. | |
31 | */ | |
32 | static inline | |
33 | void wrapper_vmalloc_sync_mappings(void) | |
34 | {} | |
35 | ||
5f4c791e | 36 | #elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0) \ |
9bfe744a | 37 | || LTTNG_KERNEL_RANGE(5,5,12, 5,6,0) \ |
2b3dbafc OP |
38 | || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0) \ |
39 | || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0) \ | |
40 | || LTTNG_KERNEL_RANGE(4,19,113, 4,20,0) \ | |
41 | || LTTNG_KERNEL_RANGE(4,14,175, 4,15,0) \ | |
42 | || LTTNG_KERNEL_RANGE(4,9,218, 4,10,0) \ | |
57acf405 | 43 | || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0) \ |
2e4c781e SB |
44 | || LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,16,0,0) \ |
45 | || LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0) \ | |
57acf405 MJ |
46 | || LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0) \ |
47 | || LTTNG_RHEL_KERNEL_RANGE(4,18,0,240,0,0, 4,19,0,0,0,0)) | |
263b6c88 MD |
48 | |
49 | static inline | |
50 | void wrapper_vmalloc_sync_mappings(void) | |
51 | { | |
52 | void (*vmalloc_sync_mappings_sym)(void); | |
53 | ||
54 | vmalloc_sync_mappings_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_mappings"); | |
55 | if (vmalloc_sync_mappings_sym) { | |
56 | vmalloc_sync_mappings_sym(); | |
57 | } else { | |
58 | #ifdef CONFIG_X86 | |
59 | /* | |
60 | * Only x86 needs vmalloc_sync_mappings to make sure LTTng does not | |
61 | * trigger recursive page faults. | |
62 | */ | |
63 | printk_once(KERN_WARNING "LTTng: vmalloc_sync_mappings symbol lookup failed.\n"); | |
5a15f70c | 64 | printk_once(KERN_WARNING "LTTng: Page fault handler and NMI tracing might trigger faults.\n"); |
263b6c88 MD |
65 | #endif |
66 | } | |
67 | } | |
68 | ||
3dfec228 MJ |
69 | /* |
70 | * Canary function to check for 'vmalloc_sync_mappings()' at compile time. | |
71 | * | |
72 | * From 'include/linux/vmalloc.h': | |
73 | * | |
74 | * void vmalloc_sync_mappings(void); | |
75 | */ | |
76 | static inline | |
77 | void __canary__vmalloc_sync_mappings(void) | |
78 | { | |
79 | vmalloc_sync_mappings(); | |
80 | } | |
81 | ||
5f4c791e | 82 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) */ |
263b6c88 MD |
83 | |
84 | /* | |
3dfec228 | 85 | * Map vmalloc_sync_mappings to vmalloc_sync_all() on kernels before 5.6. |
263b6c88 | 86 | */ |
6d2a620c | 87 | static inline |
263b6c88 | 88 | void wrapper_vmalloc_sync_mappings(void) |
6d2a620c MD |
89 | { |
90 | void (*vmalloc_sync_all_sym)(void); | |
91 | ||
c539a324 | 92 | vmalloc_sync_all_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_all"); |
6d2a620c MD |
93 | if (vmalloc_sync_all_sym) { |
94 | vmalloc_sync_all_sym(); | |
95 | } else { | |
96 | #ifdef CONFIG_X86 | |
97 | /* | |
98 | * Only x86 needs vmalloc_sync_all to make sure LTTng does not | |
99 | * trigger recursive page faults. | |
100 | */ | |
e36de50d | 101 | printk_once(KERN_WARNING "LTTng: vmalloc_sync_all symbol lookup failed.\n"); |
5a15f70c | 102 | printk_once(KERN_WARNING "LTTng: Page fault handler and NMI tracing might trigger faults.\n"); |
6d2a620c MD |
103 | #endif |
104 | } | |
105 | } | |
263b6c88 | 106 | |
3dfec228 MJ |
107 | /* |
108 | * Canary function to check for 'vmalloc_sync_all()' at compile time. | |
109 | * | |
110 | * From 'include/linux/vmalloc.h': | |
111 | * | |
112 | * void vmalloc_sync_all(void); | |
113 | */ | |
114 | static inline | |
115 | void __canary__vmalloc_sync_all(void) | |
116 | { | |
117 | vmalloc_sync_all(); | |
118 | } | |
119 | ||
5f4c791e | 120 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) */ |
263b6c88 | 121 | |
f740341a | 122 | #else /* CONFIG_KALLSYMS */ |
6d2a620c | 123 | |
5f4c791e | 124 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,8,0)) |
f740341a MJ |
125 | |
126 | /* | |
127 | * wrapper_vmalloc_sync_mappings was removed in v5.8, the vmalloc mappings | |
128 | * are now synchronized when they are created or torn down. | |
129 | */ | |
130 | static inline | |
131 | void wrapper_vmalloc_sync_mappings(void) | |
132 | {} | |
133 | ||
5f4c791e | 134 | #elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0) \ |
9bfe744a | 135 | || LTTNG_KERNEL_RANGE(5,5,12, 5,6,0) \ |
2b3dbafc OP |
136 | || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0) \ |
137 | || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0) \ | |
138 | || LTTNG_KERNEL_RANGE(4,19,113, 4,20,0) \ | |
139 | || LTTNG_KERNEL_RANGE(4,14,175, 4,15,0) \ | |
140 | || LTTNG_KERNEL_RANGE(4,9,218, 4,10,0) \ | |
2e4c781e SB |
141 | || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0)) \ |
142 | || LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,18,0,0) \ | |
143 | || LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0) \ | |
144 | || LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0) | |
263b6c88 | 145 | |
6d2a620c | 146 | static inline |
263b6c88 MD |
147 | void wrapper_vmalloc_sync_mappings(void) |
148 | { | |
149 | return vmalloc_sync_mappings(); | |
150 | } | |
151 | ||
5f4c791e | 152 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) */ |
263b6c88 MD |
153 | |
154 | static inline | |
155 | void wrapper_vmalloc_sync_mappings(void) | |
6d2a620c MD |
156 | { |
157 | return vmalloc_sync_all(); | |
158 | } | |
263b6c88 | 159 | |
5f4c791e | 160 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) */ |
263b6c88 | 161 | |
6d2a620c | 162 | #endif |
b13f3ebe | 163 | |
5f4c791e | 164 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,12,0)) |
48f5e0b5 MJ |
165 | static inline |
166 | void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node) | |
167 | { | |
168 | void *ret; | |
169 | ||
170 | ret = kvmalloc_node(size, flags, node); | |
171 | if (is_vmalloc_addr(ret)) { | |
172 | /* | |
173 | * Make sure we don't trigger recursive page faults in the | |
174 | * tracing fast path. | |
175 | */ | |
263b6c88 | 176 | wrapper_vmalloc_sync_mappings(); |
48f5e0b5 MJ |
177 | } |
178 | return ret; | |
179 | } | |
180 | ||
181 | static inline | |
182 | void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node) | |
183 | { | |
184 | return lttng_kvmalloc_node(size, flags | __GFP_ZERO, node); | |
185 | } | |
186 | ||
187 | static inline | |
188 | void *lttng_kvmalloc(unsigned long size, gfp_t flags) | |
189 | { | |
190 | return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE); | |
191 | } | |
192 | ||
193 | static inline | |
194 | void *lttng_kvzalloc(unsigned long size, gfp_t flags) | |
195 | { | |
196 | return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE); | |
197 | } | |
198 | ||
199 | static inline | |
200 | void lttng_kvfree(const void *addr) | |
201 | { | |
202 | kvfree(addr); | |
203 | } | |
204 | ||
205 | #else | |
206 | ||
207 | #include <linux/slab.h> | |
48f5e0b5 | 208 | |
20eb87c9 MD |
209 | static inline |
210 | void print_vmalloc_node_range_warning(void) | |
211 | { | |
212 | printk_once(KERN_WARNING "LTTng: __vmalloc_node_range symbol lookup failed.\n"); | |
5a15f70c MJ |
213 | printk_once(KERN_WARNING "LTTng: Tracer performance will be degraded on NUMA systems.\n"); |
214 | printk_once(KERN_WARNING "LTTng: Please rebuild your kernel with CONFIG_KALLSYMS enabled.\n"); | |
20eb87c9 MD |
215 | } |
216 | ||
5f4c791e | 217 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,0,0)) |
fd094ddf | 218 | |
48f5e0b5 MJ |
219 | /* |
220 | * kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node. | |
221 | */ | |
222 | static inline | |
20eb87c9 MD |
223 | void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align, |
224 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
225 | pgprot_t prot, unsigned long vm_flags, int node, | |
226 | const void *caller) | |
48f5e0b5 | 227 | { |
48f5e0b5 MJ |
228 | #ifdef CONFIG_KALLSYMS |
229 | /* | |
20eb87c9 | 230 | * If we have KALLSYMS, get * __vmalloc_node_range which is not exported. |
48f5e0b5 | 231 | */ |
20eb87c9 MD |
232 | void *(*lttng__vmalloc_node_range)(unsigned long size, unsigned long align, |
233 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
234 | pgprot_t prot, unsigned long vm_flags, int node, | |
235 | const void *caller); | |
236 | ||
237 | lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range"); | |
238 | if (lttng__vmalloc_node_range) | |
239 | return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot, | |
240 | vm_flags, node, caller); | |
48f5e0b5 | 241 | #endif |
20eb87c9 MD |
242 | if (node != NUMA_NO_NODE) |
243 | print_vmalloc_node_range_warning(); | |
244 | return __vmalloc(size, gfp_mask, prot); | |
48f5e0b5 | 245 | } |
3dfec228 MJ |
246 | |
247 | /* | |
248 | * Canary function to check for '__vmalloc_node_range()' at compile time. | |
249 | * | |
250 | * From 'include/linux/vmalloc.h': | |
251 | * | |
252 | * extern void *__vmalloc_node_range(unsigned long size, unsigned long align, | |
253 | * unsigned long start, unsigned long end, gfp_t gfp_mask, | |
254 | * pgprot_t prot, unsigned long vm_flags, int node, | |
255 | * const void *caller); | |
256 | */ | |
257 | static inline | |
258 | void *__canary____lttng_vmalloc_node_range(unsigned long size, unsigned long align, | |
259 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
260 | pgprot_t prot, unsigned long vm_flags, int node, | |
261 | const void *caller) | |
262 | { | |
263 | return __vmalloc_node_range(size, align, start, end, gfp_mask, prot, | |
264 | vm_flags, node, caller); | |
265 | } | |
48f5e0b5 | 266 | |
5f4c791e | 267 | #elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,6,0)) |
fd094ddf MJ |
268 | |
269 | /* | |
270 | * kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node. | |
271 | */ | |
272 | static inline | |
273 | void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align, | |
274 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
275 | pgprot_t prot, unsigned long vm_flags, int node, | |
276 | const void *caller) | |
277 | { | |
278 | #ifdef CONFIG_KALLSYMS | |
279 | /* | |
280 | * If we have KALLSYMS, get * __vmalloc_node_range which is not exported. | |
281 | */ | |
282 | void *(*lttng__vmalloc_node_range)(unsigned long size, unsigned long align, | |
283 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
284 | pgprot_t prot, int node, const void *caller); | |
285 | ||
286 | lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range"); | |
287 | if (lttng__vmalloc_node_range) | |
288 | return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot, | |
289 | node, caller); | |
290 | #endif | |
291 | if (node != NUMA_NO_NODE) | |
292 | print_vmalloc_node_range_warning(); | |
293 | return __vmalloc(size, gfp_mask, prot); | |
294 | } | |
295 | ||
296 | /* | |
297 | * Canary function to check for '__vmalloc_node_range()' at compile time. | |
298 | * | |
299 | * From 'include/linux/vmalloc.h': | |
300 | * | |
301 | * extern void *__vmalloc_node_range(unsigned long size, unsigned long align, | |
302 | * unsigned long start, unsigned long end, gfp_t gfp_mask, | |
303 | * pgprot_t prot, unsigned long vm_flags, int node, | |
304 | * const void *caller); | |
305 | */ | |
306 | static inline | |
307 | void *__canary____lttng_vmalloc_node_range(unsigned long size, unsigned long align, | |
308 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
309 | pgprot_t prot, int node, const void *caller) | |
310 | { | |
311 | return __vmalloc_node_range(size, align, start, end, gfp_mask, prot, | |
312 | node, caller); | |
313 | } | |
314 | ||
5f4c791e | 315 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,6,0)) */ |
0c8a119a MJ |
316 | |
317 | /* | |
318 | * kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node. | |
319 | */ | |
320 | static inline | |
321 | void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align, | |
322 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
323 | pgprot_t prot, unsigned long vm_flags, int node, | |
324 | void *caller) | |
325 | { | |
326 | #ifdef CONFIG_KALLSYMS | |
327 | /* | |
328 | * If we have KALLSYMS, get * __vmalloc_node_range which is not exported. | |
329 | */ | |
330 | void *(*lttng__vmalloc_node_range)(unsigned long size, unsigned long align, | |
331 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
332 | pgprot_t prot, int node, void *caller); | |
333 | ||
334 | lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range"); | |
335 | if (lttng__vmalloc_node_range) | |
336 | return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot, | |
337 | node, caller); | |
338 | #endif | |
339 | if (node != NUMA_NO_NODE) | |
340 | print_vmalloc_node_range_warning(); | |
341 | return __vmalloc(size, gfp_mask, prot); | |
342 | } | |
343 | ||
344 | /* | |
345 | * Canary function to check for '__vmalloc_node_range()' at compile time. | |
346 | * | |
347 | * From 'include/linux/vmalloc.h': | |
348 | * | |
349 | * extern void *__vmalloc_node_range(unsigned long size, unsigned long align, | |
350 | * unsigned long start, unsigned long end, gfp_t gfp_mask, | |
351 | * pgprot_t prot, unsigned long vm_flags, int node, | |
352 | * void *caller); | |
353 | */ | |
354 | static inline | |
355 | void *__canary____lttng_vmalloc_node_range(unsigned long size, unsigned long align, | |
356 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
357 | pgprot_t prot, int node, void *caller) | |
358 | { | |
359 | return __vmalloc_node_range(size, align, start, end, gfp_mask, prot, | |
360 | node, caller); | |
361 | } | |
362 | ||
fd094ddf MJ |
363 | #endif |
364 | ||
48f5e0b5 MJ |
365 | /** |
366 | * lttng_kvmalloc_node - attempt to allocate physically contiguous memory, but upon | |
367 | * failure, fall back to non-contiguous (vmalloc) allocation. | |
368 | * @size: size of the request. | |
369 | * @flags: gfp mask for the allocation - must be compatible with GFP_KERNEL. | |
370 | * | |
371 | * Uses kmalloc to get the memory but if the allocation fails then falls back | |
372 | * to the vmalloc allocator. Use lttng_kvfree to free the memory. | |
373 | * | |
374 | * Reclaim modifiers - __GFP_NORETRY, __GFP_REPEAT and __GFP_NOFAIL are not supported | |
375 | */ | |
376 | static inline | |
377 | void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node) | |
378 | { | |
379 | void *ret; | |
380 | ||
381 | /* | |
382 | * vmalloc uses GFP_KERNEL for some internal allocations (e.g page tables) | |
383 | * so the given set of flags has to be compatible. | |
384 | */ | |
385 | WARN_ON_ONCE((flags & GFP_KERNEL) != GFP_KERNEL); | |
386 | ||
387 | /* | |
388 | * If the allocation fits in a single page, do not fallback. | |
389 | */ | |
390 | if (size <= PAGE_SIZE) { | |
391 | return kmalloc_node(size, flags, node); | |
392 | } | |
393 | ||
394 | /* | |
395 | * Make sure that larger requests are not too disruptive - no OOM | |
396 | * killer and no allocation failure warnings as we have a fallback | |
397 | */ | |
398 | ret = kmalloc_node(size, flags | __GFP_NOWARN | __GFP_NORETRY, node); | |
399 | if (!ret) { | |
20eb87c9 MD |
400 | ret = __lttng_vmalloc_node_range(size, 1, |
401 | VMALLOC_START, VMALLOC_END, | |
402 | flags | __GFP_HIGHMEM, PAGE_KERNEL, 0, | |
403 | node, __builtin_return_address(0)); | |
48f5e0b5 MJ |
404 | /* |
405 | * Make sure we don't trigger recursive page faults in the | |
406 | * tracing fast path. | |
407 | */ | |
f3e4ba5d | 408 | wrapper_vmalloc_sync_mappings(); |
48f5e0b5 MJ |
409 | } |
410 | return ret; | |
411 | } | |
412 | ||
413 | static inline | |
414 | void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node) | |
415 | { | |
416 | return lttng_kvmalloc_node(size, flags | __GFP_ZERO, node); | |
417 | } | |
418 | ||
419 | static inline | |
420 | void *lttng_kvmalloc(unsigned long size, gfp_t flags) | |
421 | { | |
422 | return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE); | |
423 | } | |
424 | ||
425 | static inline | |
426 | void *lttng_kvzalloc(unsigned long size, gfp_t flags) | |
427 | { | |
428 | return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE); | |
429 | } | |
430 | ||
431 | static inline | |
432 | void lttng_kvfree(const void *addr) | |
433 | { | |
434 | if (is_vmalloc_addr(addr)) { | |
435 | vfree(addr); | |
436 | } else { | |
437 | kfree(addr); | |
438 | } | |
439 | } | |
440 | #endif | |
441 | ||
a90917c3 | 442 | #endif /* _LTTNG_WRAPPER_VMALLOC_H */ |