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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 | #include <stdio.h> #include <assert.h> #include <linux/scatterlist.h> #define MAX_PAGES (64) struct test { int alloc_ret; unsigned num_pages; unsigned *pfn; unsigned *pfn_app; unsigned size; unsigned int max_seg; unsigned int expected_segments; }; static void set_pages(struct page **pages, const unsigned *array, unsigned num) { unsigned int i; assert(num < MAX_PAGES); for (i = 0; i < num; i++) pages[i] = (struct page *)(unsigned long) ((1 + array[i]) * PAGE_SIZE); } #define pfn(...) (unsigned []){ __VA_ARGS__ } static void fail(struct test *test, struct sg_table *st, const char *cond) { unsigned int i; fprintf(stderr, "Failed on '%s'!\n\n", cond); printf("size = %u, max segment = %u, expected nents = %u\nst->nents = %u, st->orig_nents= %u\n", test->size, test->max_seg, test->expected_segments, st->nents, st->orig_nents); printf("%u input PFNs:", test->num_pages); for (i = 0; i < test->num_pages; i++) printf(" %x", test->pfn[i]); printf("\n"); exit(1); } #define VALIDATE(cond, st, test) \ if (!(cond)) \ fail((test), (st), #cond); int main(void) { const unsigned int sgmax = UINT_MAX; struct test *test, tests[] = { { -EINVAL, 1, pfn(0), NULL, PAGE_SIZE, 0, 1 }, { 0, 1, pfn(0), NULL, PAGE_SIZE, PAGE_SIZE + 1, 1 }, { 0, 1, pfn(0), NULL, PAGE_SIZE, sgmax, 1 }, { 0, 1, pfn(0), NULL, 1, sgmax, 1 }, { 0, 2, pfn(0, 1), NULL, 2 * PAGE_SIZE, sgmax, 1 }, { 0, 2, pfn(1, 0), NULL, 2 * PAGE_SIZE, sgmax, 2 }, { 0, 3, pfn(0, 1, 2), NULL, 3 * PAGE_SIZE, sgmax, 1 }, { 0, 3, pfn(0, 1, 2), NULL, 3 * PAGE_SIZE, sgmax, 1 }, { 0, 3, pfn(0, 1, 2), pfn(3, 4, 5), 3 * PAGE_SIZE, sgmax, 1 }, { 0, 3, pfn(0, 1, 2), pfn(4, 5, 6), 3 * PAGE_SIZE, sgmax, 2 }, { 0, 3, pfn(0, 2, 1), NULL, 3 * PAGE_SIZE, sgmax, 3 }, { 0, 3, pfn(0, 1, 3), NULL, 3 * PAGE_SIZE, sgmax, 2 }, { 0, 3, pfn(1, 2, 4), NULL, 3 * PAGE_SIZE, sgmax, 2 }, { 0, 3, pfn(1, 3, 4), NULL, 3 * PAGE_SIZE, sgmax, 2 }, { 0, 4, pfn(0, 1, 3, 4), NULL, 4 * PAGE_SIZE, sgmax, 2 }, { 0, 5, pfn(0, 1, 3, 4, 5), NULL, 5 * PAGE_SIZE, sgmax, 2 }, { 0, 5, pfn(0, 1, 3, 4, 6), NULL, 5 * PAGE_SIZE, sgmax, 3 }, { 0, 5, pfn(0, 1, 2, 3, 4), NULL, 5 * PAGE_SIZE, sgmax, 1 }, { 0, 5, pfn(0, 1, 2, 3, 4), NULL, 5 * PAGE_SIZE, 2 * PAGE_SIZE, 3 }, { 0, 6, pfn(0, 1, 2, 3, 4, 5), NULL, 6 * PAGE_SIZE, 2 * PAGE_SIZE, 3 }, { 0, 6, pfn(0, 2, 3, 4, 5, 6), NULL, 6 * PAGE_SIZE, 2 * PAGE_SIZE, 4 }, { 0, 6, pfn(0, 1, 3, 4, 5, 6), pfn(7, 8, 9, 10, 11, 12), 6 * PAGE_SIZE, 12 * PAGE_SIZE, 2 }, { 0, 0, NULL, NULL, 0, 0, 0 }, }; unsigned int i; for (i = 0, test = tests; test->expected_segments; test++, i++) { int left_pages = test->pfn_app ? test->num_pages : 0; struct sg_append_table append = {}; struct page *pages[MAX_PAGES]; int ret; set_pages(pages, test->pfn, test->num_pages); if (test->pfn_app) ret = sg_alloc_append_table_from_pages( &append, pages, test->num_pages, 0, test->size, test->max_seg, left_pages, GFP_KERNEL); else ret = sg_alloc_table_from_pages_segment( &append.sgt, pages, test->num_pages, 0, test->size, test->max_seg, GFP_KERNEL); assert(ret == test->alloc_ret); if (test->alloc_ret) continue; if (test->pfn_app) { set_pages(pages, test->pfn_app, test->num_pages); ret = sg_alloc_append_table_from_pages( &append, pages, test->num_pages, 0, test->size, test->max_seg, 0, GFP_KERNEL); assert(ret == test->alloc_ret); } VALIDATE(append.sgt.nents == test->expected_segments, &append.sgt, test); if (!test->pfn_app) VALIDATE(append.sgt.orig_nents == test->expected_segments, &append.sgt, test); if (test->pfn_app) sg_free_append_table(&append); else sg_free_table(&append.sgt); } assert(i == (sizeof(tests) / sizeof(tests[0])) - 1); return 0; } |