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 | ||
48f5e0b5 MJ |
15 | #include <linux/version.h> |
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 | |
11441f8f MJ |
25 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,8,0)) |
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 | ||
35 | #elif (LINUX_VERSION_CODE >= 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) \ | |
64d128d7 SB |
42 | || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0)) \ |
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) \ | |
45 | || LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0) | |
ea53823c MD |
46 | |
47 | static inline | |
48 | void wrapper_vmalloc_sync_mappings(void) | |
49 | { | |
50 | void (*vmalloc_sync_mappings_sym)(void); | |
51 | ||
52 | vmalloc_sync_mappings_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_mappings"); | |
53 | if (vmalloc_sync_mappings_sym) { | |
54 | vmalloc_sync_mappings_sym(); | |
55 | } else { | |
56 | #ifdef CONFIG_X86 | |
57 | /* | |
58 | * Only x86 needs vmalloc_sync_mappings to make sure LTTng does not | |
59 | * trigger recursive page faults. | |
60 | */ | |
61 | printk_once(KERN_WARNING "LTTng: vmalloc_sync_mappings symbol lookup failed.\n"); | |
62 | printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n"); | |
63 | #endif | |
64 | } | |
65 | } | |
66 | ||
23cfd7b5 | 67 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */ |
ea53823c MD |
68 | |
69 | /* | |
70 | * Map vmalloc_sync_mappings to vmalloc_sync_all() on kernels before 5.7. | |
71 | */ | |
6d2a620c | 72 | static inline |
ea53823c | 73 | void wrapper_vmalloc_sync_mappings(void) |
6d2a620c MD |
74 | { |
75 | void (*vmalloc_sync_all_sym)(void); | |
76 | ||
c539a324 | 77 | vmalloc_sync_all_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_all"); |
6d2a620c MD |
78 | if (vmalloc_sync_all_sym) { |
79 | vmalloc_sync_all_sym(); | |
80 | } else { | |
81 | #ifdef CONFIG_X86 | |
82 | /* | |
83 | * Only x86 needs vmalloc_sync_all to make sure LTTng does not | |
84 | * trigger recursive page faults. | |
85 | */ | |
e36de50d MD |
86 | printk_once(KERN_WARNING "LTTng: vmalloc_sync_all symbol lookup failed.\n"); |
87 | printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n"); | |
6d2a620c MD |
88 | #endif |
89 | } | |
90 | } | |
ea53823c | 91 | |
23cfd7b5 | 92 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */ |
ea53823c | 93 | |
6d2a620c MD |
94 | #else |
95 | ||
f419315f | 96 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \ |
28926981 | 97 | || LTTNG_KERNEL_RANGE(5,5,12, 5,6,0) \ |
f419315f OP |
98 | || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0) \ |
99 | || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0) \ | |
100 | || LTTNG_KERNEL_RANGE(4,19,113, 4,20,0) \ | |
101 | || LTTNG_KERNEL_RANGE(4,14,175, 4,15,0) \ | |
102 | || LTTNG_KERNEL_RANGE(4,9,218, 4,10,0) \ | |
64d128d7 SB |
103 | || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0)) \ |
104 | || LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,18,0,0) \ | |
105 | || LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0) \ | |
106 | || LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0) | |
ea53823c | 107 | |
6d2a620c | 108 | static inline |
ea53823c MD |
109 | void wrapper_vmalloc_sync_mappings(void) |
110 | { | |
111 | return vmalloc_sync_mappings(); | |
112 | } | |
113 | ||
23cfd7b5 | 114 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */ |
ea53823c MD |
115 | |
116 | static inline | |
117 | void wrapper_vmalloc_sync_mappings(void) | |
6d2a620c MD |
118 | { |
119 | return vmalloc_sync_all(); | |
120 | } | |
ea53823c | 121 | |
23cfd7b5 | 122 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */ |
ea53823c | 123 | |
6d2a620c | 124 | #endif |
b13f3ebe | 125 | |
48f5e0b5 MJ |
126 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0)) |
127 | static inline | |
128 | void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node) | |
129 | { | |
130 | void *ret; | |
131 | ||
132 | ret = kvmalloc_node(size, flags, node); | |
133 | if (is_vmalloc_addr(ret)) { | |
134 | /* | |
135 | * Make sure we don't trigger recursive page faults in the | |
136 | * tracing fast path. | |
137 | */ | |
ea53823c | 138 | wrapper_vmalloc_sync_mappings(); |
48f5e0b5 MJ |
139 | } |
140 | return ret; | |
141 | } | |
142 | ||
143 | static inline | |
144 | void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node) | |
145 | { | |
146 | return lttng_kvmalloc_node(size, flags | __GFP_ZERO, node); | |
147 | } | |
148 | ||
149 | static inline | |
150 | void *lttng_kvmalloc(unsigned long size, gfp_t flags) | |
151 | { | |
152 | return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE); | |
153 | } | |
154 | ||
155 | static inline | |
156 | void *lttng_kvzalloc(unsigned long size, gfp_t flags) | |
157 | { | |
158 | return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE); | |
159 | } | |
160 | ||
161 | static inline | |
162 | void lttng_kvfree(const void *addr) | |
163 | { | |
164 | kvfree(addr); | |
165 | } | |
166 | ||
167 | #else | |
168 | ||
169 | #include <linux/slab.h> | |
48f5e0b5 | 170 | |
20eb87c9 MD |
171 | static inline |
172 | void print_vmalloc_node_range_warning(void) | |
173 | { | |
174 | printk_once(KERN_WARNING "LTTng: __vmalloc_node_range symbol lookup failed.\n"); | |
175 | printk_once(KERN_WARNING "Tracer performance will be degraded on NUMA systems.\n"); | |
176 | printk_once(KERN_WARNING "Please rebuild your kernel with CONFIG_KALLSYMS enabled.\n"); | |
177 | } | |
178 | ||
48f5e0b5 MJ |
179 | /* |
180 | * kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node. | |
181 | */ | |
182 | static inline | |
20eb87c9 MD |
183 | void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align, |
184 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
185 | pgprot_t prot, unsigned long vm_flags, int node, | |
186 | const void *caller) | |
48f5e0b5 | 187 | { |
48f5e0b5 MJ |
188 | #ifdef CONFIG_KALLSYMS |
189 | /* | |
20eb87c9 | 190 | * If we have KALLSYMS, get * __vmalloc_node_range which is not exported. |
48f5e0b5 | 191 | */ |
20eb87c9 MD |
192 | void *(*lttng__vmalloc_node_range)(unsigned long size, unsigned long align, |
193 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
194 | pgprot_t prot, unsigned long vm_flags, int node, | |
195 | const void *caller); | |
196 | ||
197 | lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range"); | |
198 | if (lttng__vmalloc_node_range) | |
199 | return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot, | |
200 | vm_flags, node, caller); | |
48f5e0b5 | 201 | #endif |
20eb87c9 MD |
202 | if (node != NUMA_NO_NODE) |
203 | print_vmalloc_node_range_warning(); | |
204 | return __vmalloc(size, gfp_mask, prot); | |
48f5e0b5 MJ |
205 | } |
206 | ||
207 | /** | |
208 | * lttng_kvmalloc_node - attempt to allocate physically contiguous memory, but upon | |
209 | * failure, fall back to non-contiguous (vmalloc) allocation. | |
210 | * @size: size of the request. | |
211 | * @flags: gfp mask for the allocation - must be compatible with GFP_KERNEL. | |
212 | * | |
213 | * Uses kmalloc to get the memory but if the allocation fails then falls back | |
214 | * to the vmalloc allocator. Use lttng_kvfree to free the memory. | |
215 | * | |
216 | * Reclaim modifiers - __GFP_NORETRY, __GFP_REPEAT and __GFP_NOFAIL are not supported | |
217 | */ | |
218 | static inline | |
219 | void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node) | |
220 | { | |
221 | void *ret; | |
222 | ||
223 | /* | |
224 | * vmalloc uses GFP_KERNEL for some internal allocations (e.g page tables) | |
225 | * so the given set of flags has to be compatible. | |
226 | */ | |
227 | WARN_ON_ONCE((flags & GFP_KERNEL) != GFP_KERNEL); | |
228 | ||
229 | /* | |
230 | * If the allocation fits in a single page, do not fallback. | |
231 | */ | |
232 | if (size <= PAGE_SIZE) { | |
233 | return kmalloc_node(size, flags, node); | |
234 | } | |
235 | ||
236 | /* | |
237 | * Make sure that larger requests are not too disruptive - no OOM | |
238 | * killer and no allocation failure warnings as we have a fallback | |
239 | */ | |
240 | ret = kmalloc_node(size, flags | __GFP_NOWARN | __GFP_NORETRY, node); | |
241 | if (!ret) { | |
20eb87c9 MD |
242 | ret = __lttng_vmalloc_node_range(size, 1, |
243 | VMALLOC_START, VMALLOC_END, | |
244 | flags | __GFP_HIGHMEM, PAGE_KERNEL, 0, | |
245 | node, __builtin_return_address(0)); | |
48f5e0b5 MJ |
246 | /* |
247 | * Make sure we don't trigger recursive page faults in the | |
248 | * tracing fast path. | |
249 | */ | |
4d1817c1 | 250 | wrapper_vmalloc_sync_mappings(); |
48f5e0b5 MJ |
251 | } |
252 | return ret; | |
253 | } | |
254 | ||
255 | static inline | |
256 | void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node) | |
257 | { | |
258 | return lttng_kvmalloc_node(size, flags | __GFP_ZERO, node); | |
259 | } | |
260 | ||
261 | static inline | |
262 | void *lttng_kvmalloc(unsigned long size, gfp_t flags) | |
263 | { | |
264 | return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE); | |
265 | } | |
266 | ||
267 | static inline | |
268 | void *lttng_kvzalloc(unsigned long size, gfp_t flags) | |
269 | { | |
270 | return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE); | |
271 | } | |
272 | ||
273 | static inline | |
274 | void lttng_kvfree(const void *addr) | |
275 | { | |
276 | if (is_vmalloc_addr(addr)) { | |
277 | vfree(addr); | |
278 | } else { | |
279 | kfree(addr); | |
280 | } | |
281 | } | |
282 | #endif | |
283 | ||
a90917c3 | 284 | #endif /* _LTTNG_WRAPPER_VMALLOC_H */ |