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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) | |
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9 | #define GUP_LONGTERM_BENCHMARK _IOWR('g', 2, struct gup_benchmark) |
10 | #define GUP_BENCHMARK _IOWR('g', 3, struct gup_benchmark) | |
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11 | |
12 | struct gup_benchmark { | |
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13 | __u64 get_delta_usec; |
14 | __u64 put_delta_usec; | |
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15 | __u64 addr; |
16 | __u64 size; | |
17 | __u32 nr_pages_per_call; | |
18 | __u32 flags; | |
26db3d09 | 19 | __u64 expansion[10]; /* For future use */ |
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20 | }; |
21 | ||
22 | static int __gup_benchmark_ioctl(unsigned int cmd, | |
23 | struct gup_benchmark *gup) | |
24 | { | |
25 | ktime_t start_time, end_time; | |
51896864 Y |
26 | unsigned long i, nr_pages, addr, next; |
27 | int nr; | |
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28 | struct page **pages; |
29 | ||
4b408c74 DC |
30 | if (gup->size > ULONG_MAX) |
31 | return -EINVAL; | |
32 | ||
64c349f4 | 33 | nr_pages = gup->size / PAGE_SIZE; |
778e1cdd | 34 | pages = kvcalloc(nr_pages, sizeof(void *), GFP_KERNEL); |
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35 | if (!pages) |
36 | return -ENOMEM; | |
37 | ||
38 | i = 0; | |
39 | nr = gup->nr_pages_per_call; | |
40 | start_time = ktime_get(); | |
41 | for (addr = gup->addr; addr < gup->addr + gup->size; addr = next) { | |
42 | if (nr != gup->nr_pages_per_call) | |
43 | break; | |
44 | ||
45 | next = addr + nr * PAGE_SIZE; | |
46 | if (next > gup->addr + gup->size) { | |
47 | next = gup->addr + gup->size; | |
48 | nr = (next - addr) / PAGE_SIZE; | |
49 | } | |
50 | ||
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51 | switch (cmd) { |
52 | case GUP_FAST_BENCHMARK: | |
53 | nr = get_user_pages_fast(addr, nr, gup->flags & 1, | |
54 | pages + i); | |
55 | break; | |
56 | case GUP_LONGTERM_BENCHMARK: | |
57 | nr = get_user_pages_longterm(addr, nr, gup->flags & 1, | |
58 | pages + i, NULL); | |
59 | break; | |
60 | case GUP_BENCHMARK: | |
61 | nr = get_user_pages(addr, nr, gup->flags & 1, pages + i, | |
62 | NULL); | |
63 | break; | |
64 | default: | |
65 | return -1; | |
66 | } | |
67 | ||
09e35a4a MT |
68 | if (nr <= 0) |
69 | break; | |
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70 | i += nr; |
71 | } | |
72 | end_time = ktime_get(); | |
73 | ||
26db3d09 | 74 | gup->get_delta_usec = ktime_us_delta(end_time, start_time); |
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75 | gup->size = addr - gup->addr; |
76 | ||
26db3d09 | 77 | start_time = ktime_get(); |
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78 | for (i = 0; i < nr_pages; i++) { |
79 | if (!pages[i]) | |
80 | break; | |
81 | put_page(pages[i]); | |
82 | } | |
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83 | end_time = ktime_get(); |
84 | gup->put_delta_usec = ktime_us_delta(end_time, start_time); | |
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85 | |
86 | kvfree(pages); | |
87 | return 0; | |
88 | } | |
89 | ||
90 | static long gup_benchmark_ioctl(struct file *filep, unsigned int cmd, | |
91 | unsigned long arg) | |
92 | { | |
93 | struct gup_benchmark gup; | |
94 | int ret; | |
95 | ||
714a3a1e KB |
96 | switch (cmd) { |
97 | case GUP_FAST_BENCHMARK: | |
98 | case GUP_LONGTERM_BENCHMARK: | |
99 | case GUP_BENCHMARK: | |
100 | break; | |
101 | default: | |
64c349f4 | 102 | return -EINVAL; |
714a3a1e | 103 | } |
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104 | |
105 | if (copy_from_user(&gup, (void __user *)arg, sizeof(gup))) | |
106 | return -EFAULT; | |
107 | ||
108 | ret = __gup_benchmark_ioctl(cmd, &gup); | |
109 | if (ret) | |
110 | return ret; | |
111 | ||
112 | if (copy_to_user((void __user *)arg, &gup, sizeof(gup))) | |
113 | return -EFAULT; | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | static const struct file_operations gup_benchmark_fops = { | |
119 | .open = nonseekable_open, | |
120 | .unlocked_ioctl = gup_benchmark_ioctl, | |
121 | }; | |
122 | ||
123 | static int gup_benchmark_init(void) | |
124 | { | |
125 | void *ret; | |
126 | ||
127 | ret = debugfs_create_file_unsafe("gup_benchmark", 0600, NULL, NULL, | |
128 | &gup_benchmark_fops); | |
129 | if (!ret) | |
130 | pr_warn("Failed to create gup_benchmark in debugfs"); | |
131 | ||
132 | return 0; | |
133 | } | |
134 | ||
135 | late_initcall(gup_benchmark_init); |