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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> |
5939591f | 23 | #include <lttng-kernel-version.h> |
6d2a620c | 24 | |
5939591f OP |
25 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \ |
26 | || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0) \ | |
27 | || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0) \ | |
28 | || LTTNG_KERNEL_RANGE(4,19,113, 4,20,0) \ | |
29 | || LTTNG_KERNEL_RANGE(4,14,175, 4,15,0) \ | |
30 | || LTTNG_KERNEL_RANGE(4,9,218, 4,10,0) \ | |
4ad90183 SB |
31 | || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0)) \ |
32 | || LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,16,0,0) \ | |
33 | || LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0) \ | |
34 | || LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0) | |
da0fcb14 MD |
35 | |
36 | static inline | |
37 | void wrapper_vmalloc_sync_mappings(void) | |
38 | { | |
39 | void (*vmalloc_sync_mappings_sym)(void); | |
40 | ||
41 | vmalloc_sync_mappings_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_mappings"); | |
42 | if (vmalloc_sync_mappings_sym) { | |
43 | vmalloc_sync_mappings_sym(); | |
44 | } else { | |
45 | #ifdef CONFIG_X86 | |
46 | /* | |
47 | * Only x86 needs vmalloc_sync_mappings to make sure LTTng does not | |
48 | * trigger recursive page faults. | |
49 | */ | |
50 | printk_once(KERN_WARNING "LTTng: vmalloc_sync_mappings symbol lookup failed.\n"); | |
51 | printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n"); | |
52 | #endif | |
53 | } | |
54 | } | |
55 | ||
da356b32 | 56 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */ |
da0fcb14 MD |
57 | |
58 | /* | |
59 | * Map vmalloc_sync_mappings to vmalloc_sync_all() on kernels before 5.7. | |
60 | */ | |
6d2a620c | 61 | static inline |
da0fcb14 | 62 | void wrapper_vmalloc_sync_mappings(void) |
6d2a620c MD |
63 | { |
64 | void (*vmalloc_sync_all_sym)(void); | |
65 | ||
c539a324 | 66 | vmalloc_sync_all_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_all"); |
6d2a620c MD |
67 | if (vmalloc_sync_all_sym) { |
68 | vmalloc_sync_all_sym(); | |
69 | } else { | |
70 | #ifdef CONFIG_X86 | |
71 | /* | |
72 | * Only x86 needs vmalloc_sync_all to make sure LTTng does not | |
73 | * trigger recursive page faults. | |
74 | */ | |
e36de50d MD |
75 | printk_once(KERN_WARNING "LTTng: vmalloc_sync_all symbol lookup failed.\n"); |
76 | printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n"); | |
6d2a620c MD |
77 | #endif |
78 | } | |
79 | } | |
da0fcb14 | 80 | |
da356b32 | 81 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */ |
da0fcb14 | 82 | |
6d2a620c MD |
83 | #else |
84 | ||
5939591f OP |
85 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \ |
86 | || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0) \ | |
87 | || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0) \ | |
88 | || LTTNG_KERNEL_RANGE(4,19,113, 4,20,0) \ | |
89 | || LTTNG_KERNEL_RANGE(4,14,175, 4,15,0) \ | |
90 | || LTTNG_KERNEL_RANGE(4,9,218, 4,10,0) \ | |
4ad90183 SB |
91 | || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0)) \ |
92 | || LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,18,0,0) \ | |
93 | || LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0) \ | |
94 | || LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0) | |
da0fcb14 | 95 | |
6d2a620c | 96 | static inline |
da0fcb14 MD |
97 | void wrapper_vmalloc_sync_mappings(void) |
98 | { | |
99 | return vmalloc_sync_mappings(); | |
100 | } | |
101 | ||
da356b32 | 102 | #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */ |
da0fcb14 MD |
103 | |
104 | static inline | |
105 | void wrapper_vmalloc_sync_mappings(void) | |
6d2a620c MD |
106 | { |
107 | return vmalloc_sync_all(); | |
108 | } | |
da0fcb14 | 109 | |
da356b32 | 110 | #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */ |
da0fcb14 | 111 | |
6d2a620c | 112 | #endif |
b13f3ebe | 113 | |
48f5e0b5 MJ |
114 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0)) |
115 | static inline | |
116 | void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node) | |
117 | { | |
118 | void *ret; | |
119 | ||
120 | ret = kvmalloc_node(size, flags, node); | |
121 | if (is_vmalloc_addr(ret)) { | |
122 | /* | |
123 | * Make sure we don't trigger recursive page faults in the | |
124 | * tracing fast path. | |
125 | */ | |
da0fcb14 | 126 | wrapper_vmalloc_sync_mappings(); |
48f5e0b5 MJ |
127 | } |
128 | return ret; | |
129 | } | |
130 | ||
131 | static inline | |
132 | void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node) | |
133 | { | |
134 | return lttng_kvmalloc_node(size, flags | __GFP_ZERO, node); | |
135 | } | |
136 | ||
137 | static inline | |
138 | void *lttng_kvmalloc(unsigned long size, gfp_t flags) | |
139 | { | |
140 | return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE); | |
141 | } | |
142 | ||
143 | static inline | |
144 | void *lttng_kvzalloc(unsigned long size, gfp_t flags) | |
145 | { | |
146 | return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE); | |
147 | } | |
148 | ||
149 | static inline | |
150 | void lttng_kvfree(const void *addr) | |
151 | { | |
152 | kvfree(addr); | |
153 | } | |
154 | ||
155 | #else | |
156 | ||
157 | #include <linux/slab.h> | |
48f5e0b5 | 158 | |
20eb87c9 MD |
159 | static inline |
160 | void print_vmalloc_node_range_warning(void) | |
161 | { | |
162 | printk_once(KERN_WARNING "LTTng: __vmalloc_node_range symbol lookup failed.\n"); | |
163 | printk_once(KERN_WARNING "Tracer performance will be degraded on NUMA systems.\n"); | |
164 | printk_once(KERN_WARNING "Please rebuild your kernel with CONFIG_KALLSYMS enabled.\n"); | |
165 | } | |
166 | ||
48f5e0b5 MJ |
167 | /* |
168 | * kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node. | |
169 | */ | |
170 | static inline | |
20eb87c9 MD |
171 | void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align, |
172 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
173 | pgprot_t prot, unsigned long vm_flags, int node, | |
174 | const void *caller) | |
48f5e0b5 | 175 | { |
48f5e0b5 MJ |
176 | #ifdef CONFIG_KALLSYMS |
177 | /* | |
20eb87c9 | 178 | * If we have KALLSYMS, get * __vmalloc_node_range which is not exported. |
48f5e0b5 | 179 | */ |
20eb87c9 MD |
180 | void *(*lttng__vmalloc_node_range)(unsigned long size, unsigned long align, |
181 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
182 | pgprot_t prot, unsigned long vm_flags, int node, | |
183 | const void *caller); | |
184 | ||
185 | lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range"); | |
186 | if (lttng__vmalloc_node_range) | |
187 | return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot, | |
188 | vm_flags, node, caller); | |
48f5e0b5 | 189 | #endif |
20eb87c9 MD |
190 | if (node != NUMA_NO_NODE) |
191 | print_vmalloc_node_range_warning(); | |
192 | return __vmalloc(size, gfp_mask, prot); | |
48f5e0b5 MJ |
193 | } |
194 | ||
195 | /** | |
196 | * lttng_kvmalloc_node - attempt to allocate physically contiguous memory, but upon | |
197 | * failure, fall back to non-contiguous (vmalloc) allocation. | |
198 | * @size: size of the request. | |
199 | * @flags: gfp mask for the allocation - must be compatible with GFP_KERNEL. | |
200 | * | |
201 | * Uses kmalloc to get the memory but if the allocation fails then falls back | |
202 | * to the vmalloc allocator. Use lttng_kvfree to free the memory. | |
203 | * | |
204 | * Reclaim modifiers - __GFP_NORETRY, __GFP_REPEAT and __GFP_NOFAIL are not supported | |
205 | */ | |
206 | static inline | |
207 | void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node) | |
208 | { | |
209 | void *ret; | |
210 | ||
211 | /* | |
212 | * vmalloc uses GFP_KERNEL for some internal allocations (e.g page tables) | |
213 | * so the given set of flags has to be compatible. | |
214 | */ | |
215 | WARN_ON_ONCE((flags & GFP_KERNEL) != GFP_KERNEL); | |
216 | ||
217 | /* | |
218 | * If the allocation fits in a single page, do not fallback. | |
219 | */ | |
220 | if (size <= PAGE_SIZE) { | |
221 | return kmalloc_node(size, flags, node); | |
222 | } | |
223 | ||
224 | /* | |
225 | * Make sure that larger requests are not too disruptive - no OOM | |
226 | * killer and no allocation failure warnings as we have a fallback | |
227 | */ | |
228 | ret = kmalloc_node(size, flags | __GFP_NOWARN | __GFP_NORETRY, node); | |
229 | if (!ret) { | |
20eb87c9 MD |
230 | ret = __lttng_vmalloc_node_range(size, 1, |
231 | VMALLOC_START, VMALLOC_END, | |
232 | flags | __GFP_HIGHMEM, PAGE_KERNEL, 0, | |
233 | node, __builtin_return_address(0)); | |
48f5e0b5 MJ |
234 | /* |
235 | * Make sure we don't trigger recursive page faults in the | |
236 | * tracing fast path. | |
237 | */ | |
c1ba644f | 238 | wrapper_vmalloc_sync_mappings(); |
48f5e0b5 MJ |
239 | } |
240 | return ret; | |
241 | } | |
242 | ||
243 | static inline | |
244 | void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node) | |
245 | { | |
246 | return lttng_kvmalloc_node(size, flags | __GFP_ZERO, node); | |
247 | } | |
248 | ||
249 | static inline | |
250 | void *lttng_kvmalloc(unsigned long size, gfp_t flags) | |
251 | { | |
252 | return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE); | |
253 | } | |
254 | ||
255 | static inline | |
256 | void *lttng_kvzalloc(unsigned long size, gfp_t flags) | |
257 | { | |
258 | return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE); | |
259 | } | |
260 | ||
261 | static inline | |
262 | void lttng_kvfree(const void *addr) | |
263 | { | |
264 | if (is_vmalloc_addr(addr)) { | |
265 | vfree(addr); | |
266 | } else { | |
267 | kfree(addr); | |
268 | } | |
269 | } | |
270 | #endif | |
271 | ||
a90917c3 | 272 | #endif /* _LTTNG_WRAPPER_VMALLOC_H */ |