Commit | Line | Data |
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9f36eaed MJ |
1 | /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1) |
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 | ||
2d042821 | 15 | #include <lttng-kernel-version.h> |
48f5e0b5 | 16 | #include <linux/vmalloc.h> |
01ab5113 | 17 | #include <linux/mm.h> |
48f5e0b5 | 18 | |
6d2a620c MD |
19 | #ifdef CONFIG_KALLSYMS |
20 | ||
21 | #include <linux/kallsyms.h> | |
5a2f5e92 | 22 | #include <wrapper/kallsyms.h> |
f419315f | 23 | #include <lttng-kernel-version.h> |
6d2a620c | 24 | |
2d042821 | 25 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,8,0)) |
11441f8f MJ |
26 | |
27 | /* | |
28 | * wrapper_vmalloc_sync_mappings was removed in v5.8, the vmalloc mappings | |
29 | * are now synchronized when they are created or torn down. | |
30 | */ | |
31 | static inline | |
32 | void wrapper_vmalloc_sync_mappings(void) | |
33 | {} | |
34 | ||
2d042821 | 35 | #elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0) \ |
28926981 | 36 | || LTTNG_KERNEL_RANGE(5,5,12, 5,6,0) \ |
f419315f OP |
37 | || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0) \ |
38 | || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0) \ | |
39 | || LTTNG_KERNEL_RANGE(4,19,113, 4,20,0) \ | |
40 | || LTTNG_KERNEL_RANGE(4,14,175, 4,15,0) \ | |
41 | || LTTNG_KERNEL_RANGE(4,9,218, 4,10,0) \ | |
78f56ae3 | 42 | || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0) \ |
64d128d7 SB |
43 | || LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,16,0,0) \ |
44 | || LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0) \ | |
78f56ae3 MJ |
45 | || LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0) \ |
46 | || LTTNG_RHEL_KERNEL_RANGE(4,18,0,240,0,0, 4,19,0,0,0,0)) | |
ea53823c MD |
47 | |
48 | static inline | |
49 | void wrapper_vmalloc_sync_mappings(void) | |
50 | { | |
51 | void (*vmalloc_sync_mappings_sym)(void); | |
52 | ||
53 | vmalloc_sync_mappings_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_mappings"); | |
54 | if (vmalloc_sync_mappings_sym) { | |
55 | vmalloc_sync_mappings_sym(); | |
56 | } else { | |
57 | #ifdef CONFIG_X86 | |
58 | /* | |
59 | * Only x86 needs vmalloc_sync_mappings to make sure LTTng does not | |
60 | * trigger recursive page faults. | |
61 | */ | |
62 | printk_once(KERN_WARNING "LTTng: vmalloc_sync_mappings symbol lookup failed.\n"); | |
63 | printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n"); | |
64 | #endif | |
65 | } | |
66 | } | |
67 | ||
60c64030 MJ |
68 | /* |
69 | * Canary function to check for 'vmalloc_sync_mappings()' at compile time. | |
70 | * | |
71 | * From 'include/linux/vmalloc.h': | |
72 | * | |
73 | * void vmalloc_sync_mappings(void); | |
74 | */ | |
75 | static inline | |
76 | void __canary__vmalloc_sync_mappings(void) | |
77 | { | |
78 | vmalloc_sync_mappings(); | |
79 | } | |
80 | ||
2d042821 | 81 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) */ |
ea53823c MD |
82 | |
83 | /* | |
60c64030 | 84 | * Map vmalloc_sync_mappings to vmalloc_sync_all() on kernels before 5.6. |
ea53823c | 85 | */ |
6d2a620c | 86 | static inline |
ea53823c | 87 | void wrapper_vmalloc_sync_mappings(void) |
6d2a620c MD |
88 | { |
89 | void (*vmalloc_sync_all_sym)(void); | |
90 | ||
c539a324 | 91 | vmalloc_sync_all_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_all"); |
6d2a620c MD |
92 | if (vmalloc_sync_all_sym) { |
93 | vmalloc_sync_all_sym(); | |
94 | } else { | |
95 | #ifdef CONFIG_X86 | |
96 | /* | |
97 | * Only x86 needs vmalloc_sync_all to make sure LTTng does not | |
98 | * trigger recursive page faults. | |
99 | */ | |
e36de50d MD |
100 | printk_once(KERN_WARNING "LTTng: vmalloc_sync_all symbol lookup failed.\n"); |
101 | printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n"); | |
6d2a620c MD |
102 | #endif |
103 | } | |
104 | } | |
ea53823c | 105 | |
60c64030 MJ |
106 | /* |
107 | * Canary function to check for 'vmalloc_sync_all()' at compile time. | |
108 | * | |
109 | * From 'include/linux/vmalloc.h': | |
110 | * | |
111 | * void vmalloc_sync_all(void); | |
112 | */ | |
113 | static inline | |
114 | void __canary__vmalloc_sync_all(void) | |
115 | { | |
116 | vmalloc_sync_all(); | |
117 | } | |
118 | ||
2d042821 | 119 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) */ |
ea53823c | 120 | |
dd1f3ed0 | 121 | #else /* CONFIG_KALLSYMS */ |
6d2a620c | 122 | |
2d042821 | 123 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,8,0)) |
dd1f3ed0 MJ |
124 | |
125 | /* | |
126 | * wrapper_vmalloc_sync_mappings was removed in v5.8, the vmalloc mappings | |
127 | * are now synchronized when they are created or torn down. | |
128 | */ | |
129 | static inline | |
130 | void wrapper_vmalloc_sync_mappings(void) | |
131 | {} | |
132 | ||
2d042821 | 133 | #elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0) \ |
28926981 | 134 | || LTTNG_KERNEL_RANGE(5,5,12, 5,6,0) \ |
f419315f OP |
135 | || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0) \ |
136 | || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0) \ | |
137 | || LTTNG_KERNEL_RANGE(4,19,113, 4,20,0) \ | |
138 | || LTTNG_KERNEL_RANGE(4,14,175, 4,15,0) \ | |
139 | || LTTNG_KERNEL_RANGE(4,9,218, 4,10,0) \ | |
64d128d7 SB |
140 | || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0)) \ |
141 | || LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,18,0,0) \ | |
142 | || LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0) \ | |
143 | || LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0) | |
ea53823c | 144 | |
6d2a620c | 145 | static inline |
ea53823c MD |
146 | void wrapper_vmalloc_sync_mappings(void) |
147 | { | |
148 | return vmalloc_sync_mappings(); | |
149 | } | |
150 | ||
2d042821 | 151 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) */ |
ea53823c MD |
152 | |
153 | static inline | |
154 | void wrapper_vmalloc_sync_mappings(void) | |
6d2a620c MD |
155 | { |
156 | return vmalloc_sync_all(); | |
157 | } | |
ea53823c | 158 | |
2d042821 | 159 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0)) */ |
ea53823c | 160 | |
6d2a620c | 161 | #endif |
b13f3ebe | 162 | |
2d042821 | 163 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,12,0)) |
48f5e0b5 MJ |
164 | static inline |
165 | void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node) | |
166 | { | |
167 | void *ret; | |
168 | ||
169 | ret = kvmalloc_node(size, flags, node); | |
170 | if (is_vmalloc_addr(ret)) { | |
171 | /* | |
172 | * Make sure we don't trigger recursive page faults in the | |
173 | * tracing fast path. | |
174 | */ | |
ea53823c | 175 | wrapper_vmalloc_sync_mappings(); |
48f5e0b5 MJ |
176 | } |
177 | return ret; | |
178 | } | |
179 | ||
180 | static inline | |
181 | void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node) | |
182 | { | |
183 | return lttng_kvmalloc_node(size, flags | __GFP_ZERO, node); | |
184 | } | |
185 | ||
186 | static inline | |
187 | void *lttng_kvmalloc(unsigned long size, gfp_t flags) | |
188 | { | |
189 | return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE); | |
190 | } | |
191 | ||
192 | static inline | |
193 | void *lttng_kvzalloc(unsigned long size, gfp_t flags) | |
194 | { | |
195 | return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE); | |
196 | } | |
197 | ||
198 | static inline | |
199 | void lttng_kvfree(const void *addr) | |
200 | { | |
201 | kvfree(addr); | |
202 | } | |
203 | ||
204 | #else | |
205 | ||
206 | #include <linux/slab.h> | |
48f5e0b5 | 207 | |
20eb87c9 MD |
208 | static inline |
209 | void print_vmalloc_node_range_warning(void) | |
210 | { | |
211 | printk_once(KERN_WARNING "LTTng: __vmalloc_node_range symbol lookup failed.\n"); | |
212 | printk_once(KERN_WARNING "Tracer performance will be degraded on NUMA systems.\n"); | |
213 | printk_once(KERN_WARNING "Please rebuild your kernel with CONFIG_KALLSYMS enabled.\n"); | |
214 | } | |
215 | ||
2d042821 | 216 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,0,0)) |
73ca2ce7 | 217 | |
48f5e0b5 MJ |
218 | /* |
219 | * kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node. | |
220 | */ | |
221 | static inline | |
20eb87c9 MD |
222 | void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align, |
223 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
224 | pgprot_t prot, unsigned long vm_flags, int node, | |
225 | const void *caller) | |
48f5e0b5 | 226 | { |
48f5e0b5 MJ |
227 | #ifdef CONFIG_KALLSYMS |
228 | /* | |
20eb87c9 | 229 | * If we have KALLSYMS, get * __vmalloc_node_range which is not exported. |
48f5e0b5 | 230 | */ |
20eb87c9 MD |
231 | void *(*lttng__vmalloc_node_range)(unsigned long size, unsigned long align, |
232 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
233 | pgprot_t prot, unsigned long vm_flags, int node, | |
234 | const void *caller); | |
235 | ||
236 | lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range"); | |
237 | if (lttng__vmalloc_node_range) | |
238 | return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot, | |
239 | vm_flags, node, caller); | |
48f5e0b5 | 240 | #endif |
20eb87c9 MD |
241 | if (node != NUMA_NO_NODE) |
242 | print_vmalloc_node_range_warning(); | |
243 | return __vmalloc(size, gfp_mask, prot); | |
48f5e0b5 | 244 | } |
60c64030 MJ |
245 | |
246 | /* | |
247 | * Canary function to check for '__vmalloc_node_range()' at compile time. | |
248 | * | |
249 | * From 'include/linux/vmalloc.h': | |
250 | * | |
251 | * extern void *__vmalloc_node_range(unsigned long size, unsigned long align, | |
252 | * unsigned long start, unsigned long end, gfp_t gfp_mask, | |
253 | * pgprot_t prot, unsigned long vm_flags, int node, | |
254 | * const void *caller); | |
255 | */ | |
256 | static inline | |
257 | void *__canary____lttng_vmalloc_node_range(unsigned long size, unsigned long align, | |
258 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
259 | pgprot_t prot, unsigned long vm_flags, int node, | |
260 | const void *caller) | |
261 | { | |
262 | return __vmalloc_node_range(size, align, start, end, gfp_mask, prot, | |
263 | vm_flags, node, caller); | |
264 | } | |
48f5e0b5 | 265 | |
2d042821 | 266 | #elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,6,0)) |
73ca2ce7 MJ |
267 | |
268 | /* | |
269 | * kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node. | |
270 | */ | |
271 | static inline | |
272 | void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align, | |
273 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
274 | pgprot_t prot, unsigned long vm_flags, int node, | |
275 | const void *caller) | |
276 | { | |
277 | #ifdef CONFIG_KALLSYMS | |
278 | /* | |
279 | * If we have KALLSYMS, get * __vmalloc_node_range which is not exported. | |
280 | */ | |
281 | void *(*lttng__vmalloc_node_range)(unsigned long size, unsigned long align, | |
282 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
283 | pgprot_t prot, int node, const void *caller); | |
284 | ||
285 | lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range"); | |
286 | if (lttng__vmalloc_node_range) | |
287 | return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot, | |
288 | node, caller); | |
289 | #endif | |
290 | if (node != NUMA_NO_NODE) | |
291 | print_vmalloc_node_range_warning(); | |
292 | return __vmalloc(size, gfp_mask, prot); | |
293 | } | |
294 | ||
295 | /* | |
296 | * Canary function to check for '__vmalloc_node_range()' at compile time. | |
297 | * | |
298 | * From 'include/linux/vmalloc.h': | |
299 | * | |
300 | * extern void *__vmalloc_node_range(unsigned long size, unsigned long align, | |
301 | * unsigned long start, unsigned long end, gfp_t gfp_mask, | |
302 | * pgprot_t prot, unsigned long vm_flags, int node, | |
303 | * const void *caller); | |
304 | */ | |
305 | static inline | |
306 | void *__canary____lttng_vmalloc_node_range(unsigned long size, unsigned long align, | |
307 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
308 | pgprot_t prot, int node, const void *caller) | |
309 | { | |
310 | return __vmalloc_node_range(size, align, start, end, gfp_mask, prot, | |
311 | node, caller); | |
312 | } | |
313 | ||
2d042821 | 314 | #else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,6,0)) */ |
117efcba MJ |
315 | |
316 | /* | |
317 | * kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node. | |
318 | */ | |
319 | static inline | |
320 | void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align, | |
321 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
322 | pgprot_t prot, unsigned long vm_flags, int node, | |
323 | void *caller) | |
324 | { | |
325 | #ifdef CONFIG_KALLSYMS | |
326 | /* | |
327 | * If we have KALLSYMS, get * __vmalloc_node_range which is not exported. | |
328 | */ | |
329 | void *(*lttng__vmalloc_node_range)(unsigned long size, unsigned long align, | |
330 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
331 | pgprot_t prot, int node, void *caller); | |
332 | ||
333 | lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range"); | |
334 | if (lttng__vmalloc_node_range) | |
335 | return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot, | |
336 | node, caller); | |
337 | #endif | |
338 | if (node != NUMA_NO_NODE) | |
339 | print_vmalloc_node_range_warning(); | |
340 | return __vmalloc(size, gfp_mask, prot); | |
341 | } | |
342 | ||
343 | /* | |
344 | * Canary function to check for '__vmalloc_node_range()' at compile time. | |
345 | * | |
346 | * From 'include/linux/vmalloc.h': | |
347 | * | |
348 | * extern void *__vmalloc_node_range(unsigned long size, unsigned long align, | |
349 | * unsigned long start, unsigned long end, gfp_t gfp_mask, | |
350 | * pgprot_t prot, unsigned long vm_flags, int node, | |
351 | * void *caller); | |
352 | */ | |
353 | static inline | |
354 | void *__canary____lttng_vmalloc_node_range(unsigned long size, unsigned long align, | |
355 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
356 | pgprot_t prot, int node, void *caller) | |
357 | { | |
358 | return __vmalloc_node_range(size, align, start, end, gfp_mask, prot, | |
359 | node, caller); | |
360 | } | |
361 | ||
73ca2ce7 MJ |
362 | #endif |
363 | ||
48f5e0b5 MJ |
364 | /** |
365 | * lttng_kvmalloc_node - attempt to allocate physically contiguous memory, but upon | |
366 | * failure, fall back to non-contiguous (vmalloc) allocation. | |
367 | * @size: size of the request. | |
368 | * @flags: gfp mask for the allocation - must be compatible with GFP_KERNEL. | |
369 | * | |
370 | * Uses kmalloc to get the memory but if the allocation fails then falls back | |
371 | * to the vmalloc allocator. Use lttng_kvfree to free the memory. | |
372 | * | |
373 | * Reclaim modifiers - __GFP_NORETRY, __GFP_REPEAT and __GFP_NOFAIL are not supported | |
374 | */ | |
375 | static inline | |
376 | void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node) | |
377 | { | |
378 | void *ret; | |
379 | ||
380 | /* | |
381 | * vmalloc uses GFP_KERNEL for some internal allocations (e.g page tables) | |
382 | * so the given set of flags has to be compatible. | |
383 | */ | |
384 | WARN_ON_ONCE((flags & GFP_KERNEL) != GFP_KERNEL); | |
385 | ||
386 | /* | |
387 | * If the allocation fits in a single page, do not fallback. | |
388 | */ | |
389 | if (size <= PAGE_SIZE) { | |
390 | return kmalloc_node(size, flags, node); | |
391 | } | |
392 | ||
393 | /* | |
394 | * Make sure that larger requests are not too disruptive - no OOM | |
395 | * killer and no allocation failure warnings as we have a fallback | |
396 | */ | |
397 | ret = kmalloc_node(size, flags | __GFP_NOWARN | __GFP_NORETRY, node); | |
398 | if (!ret) { | |
20eb87c9 MD |
399 | ret = __lttng_vmalloc_node_range(size, 1, |
400 | VMALLOC_START, VMALLOC_END, | |
401 | flags | __GFP_HIGHMEM, PAGE_KERNEL, 0, | |
402 | node, __builtin_return_address(0)); | |
48f5e0b5 MJ |
403 | /* |
404 | * Make sure we don't trigger recursive page faults in the | |
405 | * tracing fast path. | |
406 | */ | |
4d1817c1 | 407 | wrapper_vmalloc_sync_mappings(); |
48f5e0b5 MJ |
408 | } |
409 | return ret; | |
410 | } | |
411 | ||
412 | static inline | |
413 | void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node) | |
414 | { | |
415 | return lttng_kvmalloc_node(size, flags | __GFP_ZERO, node); | |
416 | } | |
417 | ||
418 | static inline | |
419 | void *lttng_kvmalloc(unsigned long size, gfp_t flags) | |
420 | { | |
421 | return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE); | |
422 | } | |
423 | ||
424 | static inline | |
425 | void *lttng_kvzalloc(unsigned long size, gfp_t flags) | |
426 | { | |
427 | return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE); | |
428 | } | |
429 | ||
430 | static inline | |
431 | void lttng_kvfree(const void *addr) | |
432 | { | |
433 | if (is_vmalloc_addr(addr)) { | |
434 | vfree(addr); | |
435 | } else { | |
436 | kfree(addr); | |
437 | } | |
438 | } | |
439 | #endif | |
440 | ||
a90917c3 | 441 | #endif /* _LTTNG_WRAPPER_VMALLOC_H */ |