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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> | |
7 | ||
8 | #define GUP_FAST_BENCHMARK _IOWR('g', 1, struct gup_benchmark) | |
714a3a1e KB |
9 | #define GUP_LONGTERM_BENCHMARK _IOWR('g', 2, struct gup_benchmark) |
10 | #define GUP_BENCHMARK _IOWR('g', 3, struct gup_benchmark) | |
41c45d37 JH |
11 | #define PIN_FAST_BENCHMARK _IOWR('g', 4, struct gup_benchmark) |
12 | #define PIN_BENCHMARK _IOWR('g', 5, struct gup_benchmark) | |
64c349f4 KS |
13 | |
14 | struct gup_benchmark { | |
26db3d09 KB |
15 | __u64 get_delta_usec; |
16 | __u64 put_delta_usec; | |
64c349f4 KS |
17 | __u64 addr; |
18 | __u64 size; | |
19 | __u32 nr_pages_per_call; | |
20 | __u32 flags; | |
26db3d09 | 21 | __u64 expansion[10]; /* For future use */ |
64c349f4 KS |
22 | }; |
23 | ||
41c45d37 JH |
24 | static void put_back_pages(unsigned int cmd, struct page **pages, |
25 | unsigned long nr_pages) | |
26 | { | |
27 | unsigned long i; | |
28 | ||
29 | switch (cmd) { | |
30 | case GUP_FAST_BENCHMARK: | |
31 | case GUP_LONGTERM_BENCHMARK: | |
32 | case GUP_BENCHMARK: | |
33 | for (i = 0; i < nr_pages; i++) | |
34 | put_page(pages[i]); | |
35 | break; | |
36 | ||
37 | case PIN_FAST_BENCHMARK: | |
38 | case PIN_BENCHMARK: | |
39 | unpin_user_pages(pages, nr_pages); | |
40 | break; | |
41 | } | |
42 | } | |
43 | ||
44 | static void verify_dma_pinned(unsigned int cmd, struct page **pages, | |
45 | unsigned long nr_pages) | |
46 | { | |
47 | unsigned long i; | |
48 | struct page *page; | |
49 | ||
50 | switch (cmd) { | |
51 | case PIN_FAST_BENCHMARK: | |
52 | case PIN_BENCHMARK: | |
53 | for (i = 0; i < nr_pages; i++) { | |
54 | page = pages[i]; | |
55 | if (WARN(!page_maybe_dma_pinned(page), | |
56 | "pages[%lu] is NOT dma-pinned\n", i)) { | |
57 | ||
58 | dump_page(page, "gup_benchmark failure"); | |
59 | break; | |
60 | } | |
61 | } | |
62 | break; | |
63 | } | |
64 | } | |
65 | ||
64c349f4 KS |
66 | static int __gup_benchmark_ioctl(unsigned int cmd, |
67 | struct gup_benchmark *gup) | |
68 | { | |
69 | ktime_t start_time, end_time; | |
51896864 Y |
70 | unsigned long i, nr_pages, addr, next; |
71 | int nr; | |
64c349f4 | 72 | struct page **pages; |
a7c46c0c | 73 | int ret = 0; |
64c349f4 | 74 | |
4b408c74 DC |
75 | if (gup->size > ULONG_MAX) |
76 | return -EINVAL; | |
77 | ||
64c349f4 | 78 | nr_pages = gup->size / PAGE_SIZE; |
778e1cdd | 79 | pages = kvcalloc(nr_pages, sizeof(void *), GFP_KERNEL); |
64c349f4 KS |
80 | if (!pages) |
81 | return -ENOMEM; | |
82 | ||
83 | i = 0; | |
84 | nr = gup->nr_pages_per_call; | |
85 | start_time = ktime_get(); | |
86 | for (addr = gup->addr; addr < gup->addr + gup->size; addr = next) { | |
87 | if (nr != gup->nr_pages_per_call) | |
88 | break; | |
89 | ||
90 | next = addr + nr * PAGE_SIZE; | |
91 | if (next > gup->addr + gup->size) { | |
92 | next = gup->addr + gup->size; | |
93 | nr = (next - addr) / PAGE_SIZE; | |
94 | } | |
95 | ||
bdffe23e JH |
96 | /* Filter out most gup flags: only allow a tiny subset here: */ |
97 | gup->flags &= FOLL_WRITE; | |
98 | ||
714a3a1e KB |
99 | switch (cmd) { |
100 | case GUP_FAST_BENCHMARK: | |
bdffe23e | 101 | nr = get_user_pages_fast(addr, nr, gup->flags, |
714a3a1e KB |
102 | pages + i); |
103 | break; | |
104 | case GUP_LONGTERM_BENCHMARK: | |
932f4a63 | 105 | nr = get_user_pages(addr, nr, |
bdffe23e | 106 | gup->flags | FOLL_LONGTERM, |
932f4a63 | 107 | pages + i, NULL); |
714a3a1e KB |
108 | break; |
109 | case GUP_BENCHMARK: | |
bdffe23e | 110 | nr = get_user_pages(addr, nr, gup->flags, pages + i, |
714a3a1e KB |
111 | NULL); |
112 | break; | |
41c45d37 JH |
113 | case PIN_FAST_BENCHMARK: |
114 | nr = pin_user_pages_fast(addr, nr, gup->flags, | |
115 | pages + i); | |
116 | break; | |
117 | case PIN_BENCHMARK: | |
118 | nr = pin_user_pages(addr, nr, gup->flags, pages + i, | |
119 | NULL); | |
120 | break; | |
714a3a1e | 121 | default: |
a7c46c0c NE |
122 | kvfree(pages); |
123 | ret = -EINVAL; | |
124 | goto out; | |
714a3a1e KB |
125 | } |
126 | ||
09e35a4a MT |
127 | if (nr <= 0) |
128 | break; | |
64c349f4 KS |
129 | i += nr; |
130 | } | |
131 | end_time = ktime_get(); | |
132 | ||
41c45d37 JH |
133 | /* Shifting the meaning of nr_pages: now it is actual number pinned: */ |
134 | nr_pages = i; | |
135 | ||
26db3d09 | 136 | gup->get_delta_usec = ktime_us_delta(end_time, start_time); |
64c349f4 KS |
137 | gup->size = addr - gup->addr; |
138 | ||
41c45d37 JH |
139 | /* |
140 | * Take an un-benchmark-timed moment to verify DMA pinned | |
141 | * state: print a warning if any non-dma-pinned pages are found: | |
142 | */ | |
143 | verify_dma_pinned(cmd, pages, nr_pages); | |
144 | ||
26db3d09 | 145 | start_time = ktime_get(); |
41c45d37 JH |
146 | |
147 | put_back_pages(cmd, pages, nr_pages); | |
148 | ||
26db3d09 KB |
149 | end_time = ktime_get(); |
150 | gup->put_delta_usec = ktime_us_delta(end_time, start_time); | |
64c349f4 KS |
151 | |
152 | kvfree(pages); | |
a7c46c0c NE |
153 | out: |
154 | return ret; | |
64c349f4 KS |
155 | } |
156 | ||
157 | static long gup_benchmark_ioctl(struct file *filep, unsigned int cmd, | |
158 | unsigned long arg) | |
159 | { | |
160 | struct gup_benchmark gup; | |
161 | int ret; | |
162 | ||
714a3a1e KB |
163 | switch (cmd) { |
164 | case GUP_FAST_BENCHMARK: | |
165 | case GUP_LONGTERM_BENCHMARK: | |
166 | case GUP_BENCHMARK: | |
41c45d37 JH |
167 | case PIN_FAST_BENCHMARK: |
168 | case PIN_BENCHMARK: | |
714a3a1e KB |
169 | break; |
170 | default: | |
64c349f4 | 171 | return -EINVAL; |
714a3a1e | 172 | } |
64c349f4 KS |
173 | |
174 | if (copy_from_user(&gup, (void __user *)arg, sizeof(gup))) | |
175 | return -EFAULT; | |
176 | ||
177 | ret = __gup_benchmark_ioctl(cmd, &gup); | |
178 | if (ret) | |
179 | return ret; | |
180 | ||
181 | if (copy_to_user((void __user *)arg, &gup, sizeof(gup))) | |
182 | return -EFAULT; | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | static const struct file_operations gup_benchmark_fops = { | |
188 | .open = nonseekable_open, | |
189 | .unlocked_ioctl = gup_benchmark_ioctl, | |
190 | }; | |
191 | ||
192 | static int gup_benchmark_init(void) | |
193 | { | |
d9f7979c GKH |
194 | debugfs_create_file_unsafe("gup_benchmark", 0600, NULL, NULL, |
195 | &gup_benchmark_fops); | |
64c349f4 KS |
196 | |
197 | return 0; | |
198 | } | |
199 | ||
200 | late_initcall(gup_benchmark_init); |