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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 | |
f419315f | 25 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \ |
28926981 | 26 | || LTTNG_KERNEL_RANGE(5,5,12, 5,6,0) \ |
f419315f OP |
27 | || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0) \ |
28 | || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0) \ | |
29 | || LTTNG_KERNEL_RANGE(4,19,113, 4,20,0) \ | |
30 | || LTTNG_KERNEL_RANGE(4,14,175, 4,15,0) \ | |
31 | || LTTNG_KERNEL_RANGE(4,9,218, 4,10,0) \ | |
64d128d7 SB |
32 | || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0)) \ |
33 | || LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,16,0,0) \ | |
34 | || LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0) \ | |
35 | || LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0) | |
ea53823c MD |
36 | |
37 | static inline | |
38 | void wrapper_vmalloc_sync_mappings(void) | |
39 | { | |
40 | void (*vmalloc_sync_mappings_sym)(void); | |
41 | ||
42 | vmalloc_sync_mappings_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_mappings"); | |
43 | if (vmalloc_sync_mappings_sym) { | |
44 | vmalloc_sync_mappings_sym(); | |
45 | } else { | |
46 | #ifdef CONFIG_X86 | |
47 | /* | |
48 | * Only x86 needs vmalloc_sync_mappings to make sure LTTng does not | |
49 | * trigger recursive page faults. | |
50 | */ | |
51 | printk_once(KERN_WARNING "LTTng: vmalloc_sync_mappings symbol lookup failed.\n"); | |
52 | printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n"); | |
53 | #endif | |
54 | } | |
55 | } | |
56 | ||
23cfd7b5 | 57 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */ |
ea53823c MD |
58 | |
59 | /* | |
60 | * Map vmalloc_sync_mappings to vmalloc_sync_all() on kernels before 5.7. | |
61 | */ | |
6d2a620c | 62 | static inline |
ea53823c | 63 | void wrapper_vmalloc_sync_mappings(void) |
6d2a620c MD |
64 | { |
65 | void (*vmalloc_sync_all_sym)(void); | |
66 | ||
c539a324 | 67 | vmalloc_sync_all_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_all"); |
6d2a620c MD |
68 | if (vmalloc_sync_all_sym) { |
69 | vmalloc_sync_all_sym(); | |
70 | } else { | |
71 | #ifdef CONFIG_X86 | |
72 | /* | |
73 | * Only x86 needs vmalloc_sync_all to make sure LTTng does not | |
74 | * trigger recursive page faults. | |
75 | */ | |
e36de50d MD |
76 | printk_once(KERN_WARNING "LTTng: vmalloc_sync_all symbol lookup failed.\n"); |
77 | printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n"); | |
6d2a620c MD |
78 | #endif |
79 | } | |
80 | } | |
ea53823c | 81 | |
23cfd7b5 | 82 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */ |
ea53823c | 83 | |
6d2a620c MD |
84 | #else |
85 | ||
f419315f | 86 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \ |
28926981 | 87 | || LTTNG_KERNEL_RANGE(5,5,12, 5,6,0) \ |
f419315f OP |
88 | || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0) \ |
89 | || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0) \ | |
90 | || LTTNG_KERNEL_RANGE(4,19,113, 4,20,0) \ | |
91 | || LTTNG_KERNEL_RANGE(4,14,175, 4,15,0) \ | |
92 | || LTTNG_KERNEL_RANGE(4,9,218, 4,10,0) \ | |
64d128d7 SB |
93 | || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0)) \ |
94 | || LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,18,0,0) \ | |
95 | || LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0) \ | |
96 | || LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0) | |
ea53823c | 97 | |
6d2a620c | 98 | static inline |
ea53823c MD |
99 | void wrapper_vmalloc_sync_mappings(void) |
100 | { | |
101 | return vmalloc_sync_mappings(); | |
102 | } | |
103 | ||
23cfd7b5 | 104 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */ |
ea53823c MD |
105 | |
106 | static inline | |
107 | void wrapper_vmalloc_sync_mappings(void) | |
6d2a620c MD |
108 | { |
109 | return vmalloc_sync_all(); | |
110 | } | |
ea53823c | 111 | |
23cfd7b5 | 112 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */ |
ea53823c | 113 | |
6d2a620c | 114 | #endif |
b13f3ebe | 115 | |
48f5e0b5 MJ |
116 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0)) |
117 | static inline | |
118 | void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node) | |
119 | { | |
120 | void *ret; | |
121 | ||
122 | ret = kvmalloc_node(size, flags, node); | |
123 | if (is_vmalloc_addr(ret)) { | |
124 | /* | |
125 | * Make sure we don't trigger recursive page faults in the | |
126 | * tracing fast path. | |
127 | */ | |
ea53823c | 128 | wrapper_vmalloc_sync_mappings(); |
48f5e0b5 MJ |
129 | } |
130 | return ret; | |
131 | } | |
132 | ||
133 | static inline | |
134 | void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node) | |
135 | { | |
136 | return lttng_kvmalloc_node(size, flags | __GFP_ZERO, node); | |
137 | } | |
138 | ||
139 | static inline | |
140 | void *lttng_kvmalloc(unsigned long size, gfp_t flags) | |
141 | { | |
142 | return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE); | |
143 | } | |
144 | ||
145 | static inline | |
146 | void *lttng_kvzalloc(unsigned long size, gfp_t flags) | |
147 | { | |
148 | return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE); | |
149 | } | |
150 | ||
151 | static inline | |
152 | void lttng_kvfree(const void *addr) | |
153 | { | |
154 | kvfree(addr); | |
155 | } | |
156 | ||
157 | #else | |
158 | ||
159 | #include <linux/slab.h> | |
48f5e0b5 | 160 | |
20eb87c9 MD |
161 | static inline |
162 | void print_vmalloc_node_range_warning(void) | |
163 | { | |
164 | printk_once(KERN_WARNING "LTTng: __vmalloc_node_range symbol lookup failed.\n"); | |
165 | printk_once(KERN_WARNING "Tracer performance will be degraded on NUMA systems.\n"); | |
166 | printk_once(KERN_WARNING "Please rebuild your kernel with CONFIG_KALLSYMS enabled.\n"); | |
167 | } | |
168 | ||
48f5e0b5 MJ |
169 | /* |
170 | * kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node. | |
171 | */ | |
172 | static inline | |
20eb87c9 MD |
173 | void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align, |
174 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
175 | pgprot_t prot, unsigned long vm_flags, int node, | |
176 | const void *caller) | |
48f5e0b5 | 177 | { |
48f5e0b5 MJ |
178 | #ifdef CONFIG_KALLSYMS |
179 | /* | |
20eb87c9 | 180 | * If we have KALLSYMS, get * __vmalloc_node_range which is not exported. |
48f5e0b5 | 181 | */ |
20eb87c9 MD |
182 | void *(*lttng__vmalloc_node_range)(unsigned long size, unsigned long align, |
183 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
184 | pgprot_t prot, unsigned long vm_flags, int node, | |
185 | const void *caller); | |
186 | ||
187 | lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range"); | |
188 | if (lttng__vmalloc_node_range) | |
189 | return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot, | |
190 | vm_flags, node, caller); | |
48f5e0b5 | 191 | #endif |
20eb87c9 MD |
192 | if (node != NUMA_NO_NODE) |
193 | print_vmalloc_node_range_warning(); | |
194 | return __vmalloc(size, gfp_mask, prot); | |
48f5e0b5 MJ |
195 | } |
196 | ||
197 | /** | |
198 | * lttng_kvmalloc_node - attempt to allocate physically contiguous memory, but upon | |
199 | * failure, fall back to non-contiguous (vmalloc) allocation. | |
200 | * @size: size of the request. | |
201 | * @flags: gfp mask for the allocation - must be compatible with GFP_KERNEL. | |
202 | * | |
203 | * Uses kmalloc to get the memory but if the allocation fails then falls back | |
204 | * to the vmalloc allocator. Use lttng_kvfree to free the memory. | |
205 | * | |
206 | * Reclaim modifiers - __GFP_NORETRY, __GFP_REPEAT and __GFP_NOFAIL are not supported | |
207 | */ | |
208 | static inline | |
209 | void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node) | |
210 | { | |
211 | void *ret; | |
212 | ||
213 | /* | |
214 | * vmalloc uses GFP_KERNEL for some internal allocations (e.g page tables) | |
215 | * so the given set of flags has to be compatible. | |
216 | */ | |
217 | WARN_ON_ONCE((flags & GFP_KERNEL) != GFP_KERNEL); | |
218 | ||
219 | /* | |
220 | * If the allocation fits in a single page, do not fallback. | |
221 | */ | |
222 | if (size <= PAGE_SIZE) { | |
223 | return kmalloc_node(size, flags, node); | |
224 | } | |
225 | ||
226 | /* | |
227 | * Make sure that larger requests are not too disruptive - no OOM | |
228 | * killer and no allocation failure warnings as we have a fallback | |
229 | */ | |
230 | ret = kmalloc_node(size, flags | __GFP_NOWARN | __GFP_NORETRY, node); | |
231 | if (!ret) { | |
20eb87c9 MD |
232 | ret = __lttng_vmalloc_node_range(size, 1, |
233 | VMALLOC_START, VMALLOC_END, | |
234 | flags | __GFP_HIGHMEM, PAGE_KERNEL, 0, | |
235 | node, __builtin_return_address(0)); | |
48f5e0b5 MJ |
236 | /* |
237 | * Make sure we don't trigger recursive page faults in the | |
238 | * tracing fast path. | |
239 | */ | |
4d1817c1 | 240 | wrapper_vmalloc_sync_mappings(); |
48f5e0b5 MJ |
241 | } |
242 | return ret; | |
243 | } | |
244 | ||
245 | static inline | |
246 | void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node) | |
247 | { | |
248 | return lttng_kvmalloc_node(size, flags | __GFP_ZERO, node); | |
249 | } | |
250 | ||
251 | static inline | |
252 | void *lttng_kvmalloc(unsigned long size, gfp_t flags) | |
253 | { | |
254 | return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE); | |
255 | } | |
256 | ||
257 | static inline | |
258 | void *lttng_kvzalloc(unsigned long size, gfp_t flags) | |
259 | { | |
260 | return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE); | |
261 | } | |
262 | ||
263 | static inline | |
264 | void lttng_kvfree(const void *addr) | |
265 | { | |
266 | if (is_vmalloc_addr(addr)) { | |
267 | vfree(addr); | |
268 | } else { | |
269 | kfree(addr); | |
270 | } | |
271 | } | |
272 | #endif | |
273 | ||
a90917c3 | 274 | #endif /* _LTTNG_WRAPPER_VMALLOC_H */ |