4 #include <linux/scatterlist.h>
8 static void set_pages(struct page **pages, const unsigned *array, unsigned num)
12 assert(num < MAX_PAGES);
13 for (i = 0; i < num; i++)
14 pages[i] = (struct page *)(unsigned long)
15 ((1 + array[i]) * PAGE_SIZE);
18 #define pfn(...) (unsigned []){ __VA_ARGS__ }
22 const unsigned int sgmax = SCATTERLIST_MAX_SEGMENT;
29 unsigned int expected_segments;
31 { -EINVAL, 1, pfn(0), PAGE_SIZE, PAGE_SIZE + 1, 1 },
32 { -EINVAL, 1, pfn(0), PAGE_SIZE, 0, 1 },
33 { -EINVAL, 1, pfn(0), PAGE_SIZE, sgmax + 1, 1 },
34 { 0, 1, pfn(0), PAGE_SIZE, sgmax, 1 },
35 { 0, 1, pfn(0), 1, sgmax, 1 },
36 { 0, 2, pfn(0, 1), 2 * PAGE_SIZE, sgmax, 1 },
37 { 0, 2, pfn(1, 0), 2 * PAGE_SIZE, sgmax, 2 },
38 { 0, 3, pfn(0, 1, 2), 3 * PAGE_SIZE, sgmax, 1 },
39 { 0, 3, pfn(0, 2, 1), 3 * PAGE_SIZE, sgmax, 3 },
40 { 0, 3, pfn(0, 1, 3), 3 * PAGE_SIZE, sgmax, 2 },
41 { 0, 3, pfn(1, 2, 4), 3 * PAGE_SIZE, sgmax, 2 },
42 { 0, 3, pfn(1, 3, 4), 3 * PAGE_SIZE, sgmax, 2 },
43 { 0, 4, pfn(0, 1, 3, 4), 4 * PAGE_SIZE, sgmax, 2 },
44 { 0, 5, pfn(0, 1, 3, 4, 5), 5 * PAGE_SIZE, sgmax, 2 },
45 { 0, 5, pfn(0, 1, 3, 4, 6), 5 * PAGE_SIZE, sgmax, 3 },
46 { 0, 5, pfn(0, 1, 2, 3, 4), 5 * PAGE_SIZE, sgmax, 1 },
47 { 0, 5, pfn(0, 1, 2, 3, 4), 5 * PAGE_SIZE, 2 * PAGE_SIZE, 3 },
48 { 0, 6, pfn(0, 1, 2, 3, 4, 5), 6 * PAGE_SIZE, 2 * PAGE_SIZE, 3 },
49 { 0, 6, pfn(0, 2, 3, 4, 5, 6), 6 * PAGE_SIZE, 2 * PAGE_SIZE, 4 },
50 { 0, 6, pfn(0, 1, 3, 4, 5, 6), 6 * PAGE_SIZE, 2 * PAGE_SIZE, 3 },
51 { 0, 0, NULL, 0, 0, 0 },
55 for (i = 0, test = tests; test->expected_segments; test++, i++) {
56 struct page *pages[MAX_PAGES];
60 set_pages(pages, test->pfn, test->num_pages);
62 ret = __sg_alloc_table_from_pages(&st, pages, test->num_pages,
63 0, test->size, test->max_seg,
65 assert(ret == test->alloc_ret);
70 assert(st.nents == test->expected_segments);
71 assert(st.orig_nents == test->expected_segments);
76 assert(i == (sizeof(tests) / sizeof(tests[0])) - 1);