Commit | Line | Data |
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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> |
45fe4e1a | 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) \ | |
05355f0b | 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) \ | |
05355f0b 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 | |
116a8cdb | 162 | #endif /* CONFIG_KALLSYMS */ |
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 | ||
116a8cdb | 205 | #else /* >= LTTNG_KERNEL_VERSION(4,12,0) */ |
48f5e0b5 MJ |
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 | ||
48f5e0b5 MJ |
217 | /* |
218 | * kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node. | |
219 | */ | |
220 | static inline | |
20eb87c9 MD |
221 | void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align, |
222 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
223 | pgprot_t prot, unsigned long vm_flags, int node, | |
224 | const void *caller) | |
48f5e0b5 | 225 | { |
48f5e0b5 MJ |
226 | #ifdef CONFIG_KALLSYMS |
227 | /* | |
20eb87c9 | 228 | * If we have KALLSYMS, get * __vmalloc_node_range which is not exported. |
48f5e0b5 | 229 | */ |
20eb87c9 MD |
230 | void *(*lttng__vmalloc_node_range)(unsigned long size, unsigned long align, |
231 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
232 | pgprot_t prot, unsigned long vm_flags, int node, | |
233 | const void *caller); | |
234 | ||
235 | lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range"); | |
236 | if (lttng__vmalloc_node_range) | |
237 | return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot, | |
238 | vm_flags, node, caller); | |
48f5e0b5 | 239 | #endif |
20eb87c9 MD |
240 | if (node != NUMA_NO_NODE) |
241 | print_vmalloc_node_range_warning(); | |
242 | return __vmalloc(size, gfp_mask, prot); | |
48f5e0b5 | 243 | } |
3dfec228 MJ |
244 | |
245 | /* | |
246 | * Canary function to check for '__vmalloc_node_range()' at compile time. | |
247 | * | |
248 | * From 'include/linux/vmalloc.h': | |
249 | * | |
250 | * extern void *__vmalloc_node_range(unsigned long size, unsigned long align, | |
251 | * unsigned long start, unsigned long end, gfp_t gfp_mask, | |
252 | * pgprot_t prot, unsigned long vm_flags, int node, | |
253 | * const void *caller); | |
254 | */ | |
255 | static inline | |
256 | void *__canary____lttng_vmalloc_node_range(unsigned long size, unsigned long align, | |
257 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
258 | pgprot_t prot, unsigned long vm_flags, int node, | |
259 | const void *caller) | |
260 | { | |
261 | return __vmalloc_node_range(size, align, start, end, gfp_mask, prot, | |
262 | vm_flags, node, caller); | |
263 | } | |
48f5e0b5 MJ |
264 | |
265 | /** | |
266 | * lttng_kvmalloc_node - attempt to allocate physically contiguous memory, but upon | |
267 | * failure, fall back to non-contiguous (vmalloc) allocation. | |
268 | * @size: size of the request. | |
269 | * @flags: gfp mask for the allocation - must be compatible with GFP_KERNEL. | |
270 | * | |
271 | * Uses kmalloc to get the memory but if the allocation fails then falls back | |
272 | * to the vmalloc allocator. Use lttng_kvfree to free the memory. | |
273 | * | |
274 | * Reclaim modifiers - __GFP_NORETRY, __GFP_REPEAT and __GFP_NOFAIL are not supported | |
275 | */ | |
276 | static inline | |
277 | void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node) | |
278 | { | |
279 | void *ret; | |
280 | ||
281 | /* | |
282 | * vmalloc uses GFP_KERNEL for some internal allocations (e.g page tables) | |
283 | * so the given set of flags has to be compatible. | |
284 | */ | |
285 | WARN_ON_ONCE((flags & GFP_KERNEL) != GFP_KERNEL); | |
286 | ||
287 | /* | |
288 | * If the allocation fits in a single page, do not fallback. | |
289 | */ | |
290 | if (size <= PAGE_SIZE) { | |
291 | return kmalloc_node(size, flags, node); | |
292 | } | |
293 | ||
294 | /* | |
295 | * Make sure that larger requests are not too disruptive - no OOM | |
296 | * killer and no allocation failure warnings as we have a fallback | |
297 | */ | |
298 | ret = kmalloc_node(size, flags | __GFP_NOWARN | __GFP_NORETRY, node); | |
299 | if (!ret) { | |
20eb87c9 MD |
300 | ret = __lttng_vmalloc_node_range(size, 1, |
301 | VMALLOC_START, VMALLOC_END, | |
302 | flags | __GFP_HIGHMEM, PAGE_KERNEL, 0, | |
303 | node, __builtin_return_address(0)); | |
48f5e0b5 MJ |
304 | /* |
305 | * Make sure we don't trigger recursive page faults in the | |
306 | * tracing fast path. | |
307 | */ | |
f3e4ba5d | 308 | wrapper_vmalloc_sync_mappings(); |
48f5e0b5 MJ |
309 | } |
310 | return ret; | |
311 | } | |
312 | ||
313 | static inline | |
314 | void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node) | |
315 | { | |
316 | return lttng_kvmalloc_node(size, flags | __GFP_ZERO, node); | |
317 | } | |
318 | ||
319 | static inline | |
320 | void *lttng_kvmalloc(unsigned long size, gfp_t flags) | |
321 | { | |
322 | return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE); | |
323 | } | |
324 | ||
325 | static inline | |
326 | void *lttng_kvzalloc(unsigned long size, gfp_t flags) | |
327 | { | |
328 | return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE); | |
329 | } | |
330 | ||
331 | static inline | |
332 | void lttng_kvfree(const void *addr) | |
333 | { | |
334 | if (is_vmalloc_addr(addr)) { | |
335 | vfree(addr); | |
336 | } else { | |
337 | kfree(addr); | |
338 | } | |
339 | } | |
116a8cdb | 340 | #endif /* >= LTTNG_KERNEL_VERSION(4,12,0) */ |
48f5e0b5 | 341 | |
a90917c3 | 342 | #endif /* _LTTNG_WRAPPER_VMALLOC_H */ |