Commit | Line | Data |
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64c349f4 KS |
1 | #include <linux/kernel.h> |
2 | #include <linux/mm.h> | |
3 | #include <linux/slab.h> | |
4 | #include <linux/uaccess.h> | |
5 | #include <linux/ktime.h> | |
6 | #include <linux/debugfs.h> | |
a0ac9b35 | 7 | #include <linux/highmem.h> |
b9dcfdff | 8 | #include "gup_test.h" |
64c349f4 | 9 | |
41c45d37 | 10 | static void put_back_pages(unsigned int cmd, struct page **pages, |
f4f9bda4 | 11 | unsigned long nr_pages, unsigned int gup_test_flags) |
41c45d37 JH |
12 | { |
13 | unsigned long i; | |
14 | ||
15 | switch (cmd) { | |
16 | case GUP_FAST_BENCHMARK: | |
a9bed1e1 | 17 | case GUP_BASIC_TEST: |
41c45d37 JH |
18 | for (i = 0; i < nr_pages; i++) |
19 | put_page(pages[i]); | |
20 | break; | |
21 | ||
22 | case PIN_FAST_BENCHMARK: | |
a9bed1e1 | 23 | case PIN_BASIC_TEST: |
657d4f79 | 24 | case PIN_LONGTERM_BENCHMARK: |
41c45d37 JH |
25 | unpin_user_pages(pages, nr_pages); |
26 | break; | |
f4f9bda4 JH |
27 | case DUMP_USER_PAGES_TEST: |
28 | if (gup_test_flags & GUP_TEST_FLAG_DUMP_PAGES_USE_PIN) { | |
29 | unpin_user_pages(pages, nr_pages); | |
30 | } else { | |
31 | for (i = 0; i < nr_pages; i++) | |
32 | put_page(pages[i]); | |
33 | ||
34 | } | |
35 | break; | |
41c45d37 JH |
36 | } |
37 | } | |
38 | ||
39 | static void verify_dma_pinned(unsigned int cmd, struct page **pages, | |
40 | unsigned long nr_pages) | |
41 | { | |
42 | unsigned long i; | |
43 | struct page *page; | |
44 | ||
45 | switch (cmd) { | |
46 | case PIN_FAST_BENCHMARK: | |
a9bed1e1 | 47 | case PIN_BASIC_TEST: |
657d4f79 | 48 | case PIN_LONGTERM_BENCHMARK: |
41c45d37 JH |
49 | for (i = 0; i < nr_pages; i++) { |
50 | page = pages[i]; | |
51 | if (WARN(!page_maybe_dma_pinned(page), | |
52 | "pages[%lu] is NOT dma-pinned\n", i)) { | |
53 | ||
9c84f229 | 54 | dump_page(page, "gup_test failure"); |
41c45d37 | 55 | break; |
e44605a8 | 56 | } else if (cmd == PIN_LONGTERM_BENCHMARK && |
6077c943 | 57 | WARN(!is_longterm_pinnable_page(page), |
e44605a8 PT |
58 | "pages[%lu] is NOT pinnable but pinned\n", |
59 | i)) { | |
60 | dump_page(page, "gup_test failure"); | |
61 | break; | |
41c45d37 JH |
62 | } |
63 | } | |
64 | break; | |
65 | } | |
66 | } | |
67 | ||
f4f9bda4 JH |
68 | static void dump_pages_test(struct gup_test *gup, struct page **pages, |
69 | unsigned long nr_pages) | |
70 | { | |
71 | unsigned int index_to_dump; | |
72 | unsigned int i; | |
73 | ||
74 | /* | |
75 | * Zero out any user-supplied page index that is out of range. Remember: | |
76 | * .which_pages[] contains a 1-based set of page indices. | |
77 | */ | |
78 | for (i = 0; i < GUP_TEST_MAX_PAGES_TO_DUMP; i++) { | |
79 | if (gup->which_pages[i] > nr_pages) { | |
80 | pr_warn("ZEROING due to out of range: .which_pages[%u]: %u\n", | |
81 | i, gup->which_pages[i]); | |
82 | gup->which_pages[i] = 0; | |
83 | } | |
84 | } | |
85 | ||
86 | for (i = 0; i < GUP_TEST_MAX_PAGES_TO_DUMP; i++) { | |
87 | index_to_dump = gup->which_pages[i]; | |
88 | ||
89 | if (index_to_dump) { | |
90 | index_to_dump--; // Decode from 1-based, to 0-based | |
91 | pr_info("---- page #%u, starting from user virt addr: 0x%llx\n", | |
92 | index_to_dump, gup->addr); | |
93 | dump_page(pages[index_to_dump], | |
94 | "gup_test: dump_pages() test"); | |
95 | } | |
96 | } | |
97 | } | |
98 | ||
9c84f229 JH |
99 | static int __gup_test_ioctl(unsigned int cmd, |
100 | struct gup_test *gup) | |
64c349f4 KS |
101 | { |
102 | ktime_t start_time, end_time; | |
51896864 | 103 | unsigned long i, nr_pages, addr, next; |
79dbf135 | 104 | long nr; |
64c349f4 | 105 | struct page **pages; |
a7c46c0c | 106 | int ret = 0; |
f3964599 JH |
107 | bool needs_mmap_lock = |
108 | cmd != GUP_FAST_BENCHMARK && cmd != PIN_FAST_BENCHMARK; | |
64c349f4 | 109 | |
4b408c74 DC |
110 | if (gup->size > ULONG_MAX) |
111 | return -EINVAL; | |
112 | ||
64c349f4 | 113 | nr_pages = gup->size / PAGE_SIZE; |
778e1cdd | 114 | pages = kvcalloc(nr_pages, sizeof(void *), GFP_KERNEL); |
64c349f4 KS |
115 | if (!pages) |
116 | return -ENOMEM; | |
117 | ||
f3964599 JH |
118 | if (needs_mmap_lock && mmap_read_lock_killable(current->mm)) { |
119 | ret = -EINTR; | |
120 | goto free_pages; | |
121 | } | |
122 | ||
64c349f4 KS |
123 | i = 0; |
124 | nr = gup->nr_pages_per_call; | |
125 | start_time = ktime_get(); | |
126 | for (addr = gup->addr; addr < gup->addr + gup->size; addr = next) { | |
127 | if (nr != gup->nr_pages_per_call) | |
128 | break; | |
129 | ||
130 | next = addr + nr * PAGE_SIZE; | |
131 | if (next > gup->addr + gup->size) { | |
132 | next = gup->addr + gup->size; | |
133 | nr = (next - addr) / PAGE_SIZE; | |
134 | } | |
135 | ||
714a3a1e KB |
136 | switch (cmd) { |
137 | case GUP_FAST_BENCHMARK: | |
79dbf135 | 138 | nr = get_user_pages_fast(addr, nr, gup->gup_flags, |
714a3a1e KB |
139 | pages + i); |
140 | break; | |
a9bed1e1 | 141 | case GUP_BASIC_TEST: |
79dbf135 | 142 | nr = get_user_pages(addr, nr, gup->gup_flags, pages + i, |
714a3a1e KB |
143 | NULL); |
144 | break; | |
41c45d37 | 145 | case PIN_FAST_BENCHMARK: |
79dbf135 | 146 | nr = pin_user_pages_fast(addr, nr, gup->gup_flags, |
41c45d37 JH |
147 | pages + i); |
148 | break; | |
a9bed1e1 | 149 | case PIN_BASIC_TEST: |
79dbf135 | 150 | nr = pin_user_pages(addr, nr, gup->gup_flags, pages + i, |
41c45d37 JH |
151 | NULL); |
152 | break; | |
657d4f79 BS |
153 | case PIN_LONGTERM_BENCHMARK: |
154 | nr = pin_user_pages(addr, nr, | |
79dbf135 | 155 | gup->gup_flags | FOLL_LONGTERM, |
657d4f79 BS |
156 | pages + i, NULL); |
157 | break; | |
f4f9bda4 | 158 | case DUMP_USER_PAGES_TEST: |
79dbf135 PT |
159 | if (gup->test_flags & GUP_TEST_FLAG_DUMP_PAGES_USE_PIN) |
160 | nr = pin_user_pages(addr, nr, gup->gup_flags, | |
f4f9bda4 JH |
161 | pages + i, NULL); |
162 | else | |
79dbf135 | 163 | nr = get_user_pages(addr, nr, gup->gup_flags, |
f4f9bda4 JH |
164 | pages + i, NULL); |
165 | break; | |
714a3a1e | 166 | default: |
a7c46c0c | 167 | ret = -EINVAL; |
f3964599 | 168 | goto unlock; |
714a3a1e KB |
169 | } |
170 | ||
09e35a4a MT |
171 | if (nr <= 0) |
172 | break; | |
64c349f4 KS |
173 | i += nr; |
174 | } | |
175 | end_time = ktime_get(); | |
176 | ||
41c45d37 JH |
177 | /* Shifting the meaning of nr_pages: now it is actual number pinned: */ |
178 | nr_pages = i; | |
179 | ||
26db3d09 | 180 | gup->get_delta_usec = ktime_us_delta(end_time, start_time); |
64c349f4 KS |
181 | gup->size = addr - gup->addr; |
182 | ||
41c45d37 JH |
183 | /* |
184 | * Take an un-benchmark-timed moment to verify DMA pinned | |
185 | * state: print a warning if any non-dma-pinned pages are found: | |
186 | */ | |
187 | verify_dma_pinned(cmd, pages, nr_pages); | |
188 | ||
f4f9bda4 JH |
189 | if (cmd == DUMP_USER_PAGES_TEST) |
190 | dump_pages_test(gup, pages, nr_pages); | |
191 | ||
26db3d09 | 192 | start_time = ktime_get(); |
41c45d37 | 193 | |
79dbf135 | 194 | put_back_pages(cmd, pages, nr_pages, gup->test_flags); |
41c45d37 | 195 | |
26db3d09 KB |
196 | end_time = ktime_get(); |
197 | gup->put_delta_usec = ktime_us_delta(end_time, start_time); | |
64c349f4 | 198 | |
f3964599 JH |
199 | unlock: |
200 | if (needs_mmap_lock) | |
201 | mmap_read_unlock(current->mm); | |
202 | free_pages: | |
64c349f4 | 203 | kvfree(pages); |
a7c46c0c | 204 | return ret; |
64c349f4 KS |
205 | } |
206 | ||
c77369b4 DH |
207 | static DEFINE_MUTEX(pin_longterm_test_mutex); |
208 | static struct page **pin_longterm_test_pages; | |
209 | static unsigned long pin_longterm_test_nr_pages; | |
210 | ||
211 | static inline void pin_longterm_test_stop(void) | |
212 | { | |
213 | if (pin_longterm_test_pages) { | |
214 | if (pin_longterm_test_nr_pages) | |
215 | unpin_user_pages(pin_longterm_test_pages, | |
216 | pin_longterm_test_nr_pages); | |
61b963b5 | 217 | kvfree(pin_longterm_test_pages); |
c77369b4 DH |
218 | pin_longterm_test_pages = NULL; |
219 | pin_longterm_test_nr_pages = 0; | |
220 | } | |
221 | } | |
222 | ||
223 | static inline int pin_longterm_test_start(unsigned long arg) | |
224 | { | |
225 | long nr_pages, cur_pages, addr, remaining_pages; | |
226 | int gup_flags = FOLL_LONGTERM; | |
227 | struct pin_longterm_test args; | |
228 | struct page **pages; | |
229 | int ret = 0; | |
230 | bool fast; | |
231 | ||
232 | if (pin_longterm_test_pages) | |
233 | return -EINVAL; | |
234 | ||
235 | if (copy_from_user(&args, (void __user *)arg, sizeof(args))) | |
236 | return -EFAULT; | |
237 | ||
238 | if (args.flags & | |
239 | ~(PIN_LONGTERM_TEST_FLAG_USE_WRITE|PIN_LONGTERM_TEST_FLAG_USE_FAST)) | |
240 | return -EINVAL; | |
241 | if (!IS_ALIGNED(args.addr | args.size, PAGE_SIZE)) | |
242 | return -EINVAL; | |
243 | if (args.size > LONG_MAX) | |
244 | return -EINVAL; | |
245 | nr_pages = args.size / PAGE_SIZE; | |
246 | if (!nr_pages) | |
247 | return -EINVAL; | |
248 | ||
249 | pages = kvcalloc(nr_pages, sizeof(void *), GFP_KERNEL); | |
250 | if (!pages) | |
251 | return -ENOMEM; | |
252 | ||
253 | if (args.flags & PIN_LONGTERM_TEST_FLAG_USE_WRITE) | |
254 | gup_flags |= FOLL_WRITE; | |
255 | fast = !!(args.flags & PIN_LONGTERM_TEST_FLAG_USE_FAST); | |
256 | ||
257 | if (!fast && mmap_read_lock_killable(current->mm)) { | |
61b963b5 | 258 | kvfree(pages); |
c77369b4 DH |
259 | return -EINTR; |
260 | } | |
261 | ||
262 | pin_longterm_test_pages = pages; | |
263 | pin_longterm_test_nr_pages = 0; | |
264 | ||
265 | while (nr_pages - pin_longterm_test_nr_pages) { | |
266 | remaining_pages = nr_pages - pin_longterm_test_nr_pages; | |
267 | addr = args.addr + pin_longterm_test_nr_pages * PAGE_SIZE; | |
268 | ||
269 | if (fast) | |
270 | cur_pages = pin_user_pages_fast(addr, remaining_pages, | |
271 | gup_flags, pages); | |
272 | else | |
273 | cur_pages = pin_user_pages(addr, remaining_pages, | |
274 | gup_flags, pages, NULL); | |
275 | if (cur_pages < 0) { | |
276 | pin_longterm_test_stop(); | |
277 | ret = cur_pages; | |
278 | break; | |
279 | } | |
280 | pin_longterm_test_nr_pages += cur_pages; | |
281 | pages += cur_pages; | |
282 | } | |
283 | ||
284 | if (!fast) | |
285 | mmap_read_unlock(current->mm); | |
286 | return ret; | |
287 | } | |
288 | ||
289 | static inline int pin_longterm_test_read(unsigned long arg) | |
290 | { | |
291 | __u64 user_addr; | |
292 | unsigned long i; | |
293 | ||
294 | if (!pin_longterm_test_pages) | |
295 | return -EINVAL; | |
296 | ||
297 | if (copy_from_user(&user_addr, (void __user *)arg, sizeof(user_addr))) | |
298 | return -EFAULT; | |
299 | ||
300 | for (i = 0; i < pin_longterm_test_nr_pages; i++) { | |
a0ac9b35 DH |
301 | void *addr = kmap_local_page(pin_longterm_test_pages[i]); |
302 | unsigned long ret; | |
c77369b4 | 303 | |
a0ac9b35 DH |
304 | ret = copy_to_user((void __user *)(unsigned long)user_addr, addr, |
305 | PAGE_SIZE); | |
306 | kunmap_local(addr); | |
307 | if (ret) | |
c77369b4 DH |
308 | return -EFAULT; |
309 | user_addr += PAGE_SIZE; | |
310 | } | |
311 | return 0; | |
312 | } | |
313 | ||
314 | static long pin_longterm_test_ioctl(struct file *filep, unsigned int cmd, | |
315 | unsigned long arg) | |
316 | { | |
317 | int ret = -EINVAL; | |
318 | ||
319 | if (mutex_lock_killable(&pin_longterm_test_mutex)) | |
320 | return -EINTR; | |
321 | ||
322 | switch (cmd) { | |
323 | case PIN_LONGTERM_TEST_START: | |
324 | ret = pin_longterm_test_start(arg); | |
325 | break; | |
326 | case PIN_LONGTERM_TEST_STOP: | |
327 | pin_longterm_test_stop(); | |
328 | ret = 0; | |
329 | break; | |
330 | case PIN_LONGTERM_TEST_READ: | |
331 | ret = pin_longterm_test_read(arg); | |
332 | break; | |
333 | } | |
334 | ||
335 | mutex_unlock(&pin_longterm_test_mutex); | |
336 | return ret; | |
337 | } | |
338 | ||
9c84f229 | 339 | static long gup_test_ioctl(struct file *filep, unsigned int cmd, |
64c349f4 KS |
340 | unsigned long arg) |
341 | { | |
9c84f229 | 342 | struct gup_test gup; |
64c349f4 KS |
343 | int ret; |
344 | ||
714a3a1e KB |
345 | switch (cmd) { |
346 | case GUP_FAST_BENCHMARK: | |
41c45d37 | 347 | case PIN_FAST_BENCHMARK: |
657d4f79 | 348 | case PIN_LONGTERM_BENCHMARK: |
a9bed1e1 JH |
349 | case GUP_BASIC_TEST: |
350 | case PIN_BASIC_TEST: | |
f4f9bda4 | 351 | case DUMP_USER_PAGES_TEST: |
714a3a1e | 352 | break; |
c77369b4 DH |
353 | case PIN_LONGTERM_TEST_START: |
354 | case PIN_LONGTERM_TEST_STOP: | |
355 | case PIN_LONGTERM_TEST_READ: | |
356 | return pin_longterm_test_ioctl(filep, cmd, arg); | |
714a3a1e | 357 | default: |
64c349f4 | 358 | return -EINVAL; |
714a3a1e | 359 | } |
64c349f4 KS |
360 | |
361 | if (copy_from_user(&gup, (void __user *)arg, sizeof(gup))) | |
362 | return -EFAULT; | |
363 | ||
9c84f229 | 364 | ret = __gup_test_ioctl(cmd, &gup); |
64c349f4 KS |
365 | if (ret) |
366 | return ret; | |
367 | ||
368 | if (copy_to_user((void __user *)arg, &gup, sizeof(gup))) | |
369 | return -EFAULT; | |
370 | ||
371 | return 0; | |
372 | } | |
373 | ||
c77369b4 DH |
374 | static int gup_test_release(struct inode *inode, struct file *file) |
375 | { | |
376 | pin_longterm_test_stop(); | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
9c84f229 | 381 | static const struct file_operations gup_test_fops = { |
64c349f4 | 382 | .open = nonseekable_open, |
9c84f229 | 383 | .unlocked_ioctl = gup_test_ioctl, |
c77369b4 | 384 | .release = gup_test_release, |
64c349f4 KS |
385 | }; |
386 | ||
afaa7888 | 387 | static int __init gup_test_init(void) |
64c349f4 | 388 | { |
9c84f229 JH |
389 | debugfs_create_file_unsafe("gup_test", 0600, NULL, NULL, |
390 | &gup_test_fops); | |
64c349f4 KS |
391 | |
392 | return 0; | |
393 | } | |
394 | ||
9c84f229 | 395 | late_initcall(gup_test_init); |