134 lines
3.7 KiB
C
134 lines
3.7 KiB
C
#include <stdio.h>
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#include <assert.h>
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#include <linux/scatterlist.h>
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#define MAX_PAGES (64)
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struct test {
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int alloc_ret;
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unsigned num_pages;
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unsigned *pfn;
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unsigned *pfn_app;
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unsigned size;
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unsigned int max_seg;
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unsigned int expected_segments;
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};
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static void set_pages(struct page **pages, const unsigned *array, unsigned num)
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{
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unsigned int i;
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assert(num < MAX_PAGES);
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for (i = 0; i < num; i++)
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pages[i] = (struct page *)(unsigned long)
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((1 + array[i]) * PAGE_SIZE);
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}
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#define pfn(...) (unsigned []){ __VA_ARGS__ }
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static void fail(struct test *test, struct sg_table *st, const char *cond)
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{
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unsigned int i;
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fprintf(stderr, "Failed on '%s'!\n\n", cond);
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printf("size = %u, max segment = %u, expected nents = %u\nst->nents = %u, st->orig_nents= %u\n",
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test->size, test->max_seg, test->expected_segments, st->nents,
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st->orig_nents);
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printf("%u input PFNs:", test->num_pages);
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for (i = 0; i < test->num_pages; i++)
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printf(" %x", test->pfn[i]);
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printf("\n");
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exit(1);
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}
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#define VALIDATE(cond, st, test) \
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if (!(cond)) \
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fail((test), (st), #cond);
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int main(void)
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{
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const unsigned int sgmax = UINT_MAX;
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struct test *test, tests[] = {
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{ -EINVAL, 1, pfn(0), NULL, PAGE_SIZE, 0, 1 },
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{ 0, 1, pfn(0), NULL, PAGE_SIZE, PAGE_SIZE + 1, 1 },
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{ 0, 1, pfn(0), NULL, PAGE_SIZE, sgmax, 1 },
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{ 0, 1, pfn(0), NULL, 1, sgmax, 1 },
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{ 0, 2, pfn(0, 1), NULL, 2 * PAGE_SIZE, sgmax, 1 },
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{ 0, 2, pfn(1, 0), NULL, 2 * PAGE_SIZE, sgmax, 2 },
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{ 0, 3, pfn(0, 1, 2), NULL, 3 * PAGE_SIZE, sgmax, 1 },
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{ 0, 3, pfn(0, 1, 2), NULL, 3 * PAGE_SIZE, sgmax, 1 },
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{ 0, 3, pfn(0, 1, 2), pfn(3, 4, 5), 3 * PAGE_SIZE, sgmax, 1 },
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{ 0, 3, pfn(0, 1, 2), pfn(4, 5, 6), 3 * PAGE_SIZE, sgmax, 2 },
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{ 0, 3, pfn(0, 2, 1), NULL, 3 * PAGE_SIZE, sgmax, 3 },
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{ 0, 3, pfn(0, 1, 3), NULL, 3 * PAGE_SIZE, sgmax, 2 },
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{ 0, 3, pfn(1, 2, 4), NULL, 3 * PAGE_SIZE, sgmax, 2 },
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{ 0, 3, pfn(1, 3, 4), NULL, 3 * PAGE_SIZE, sgmax, 2 },
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{ 0, 4, pfn(0, 1, 3, 4), NULL, 4 * PAGE_SIZE, sgmax, 2 },
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{ 0, 5, pfn(0, 1, 3, 4, 5), NULL, 5 * PAGE_SIZE, sgmax, 2 },
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{ 0, 5, pfn(0, 1, 3, 4, 6), NULL, 5 * PAGE_SIZE, sgmax, 3 },
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{ 0, 5, pfn(0, 1, 2, 3, 4), NULL, 5 * PAGE_SIZE, sgmax, 1 },
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{ 0, 5, pfn(0, 1, 2, 3, 4), NULL, 5 * PAGE_SIZE, 2 * PAGE_SIZE,
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3 },
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{ 0, 6, pfn(0, 1, 2, 3, 4, 5), NULL, 6 * PAGE_SIZE,
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2 * PAGE_SIZE, 3 },
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{ 0, 6, pfn(0, 2, 3, 4, 5, 6), NULL, 6 * PAGE_SIZE,
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2 * PAGE_SIZE, 4 },
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{ 0, 6, pfn(0, 1, 3, 4, 5, 6), pfn(7, 8, 9, 10, 11, 12),
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6 * PAGE_SIZE, 12 * PAGE_SIZE, 2 },
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{ 0, 0, NULL, NULL, 0, 0, 0 },
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};
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unsigned int i;
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for (i = 0, test = tests; test->expected_segments; test++, i++) {
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int left_pages = test->pfn_app ? test->num_pages : 0;
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struct sg_append_table append = {};
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struct page *pages[MAX_PAGES];
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int ret;
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set_pages(pages, test->pfn, test->num_pages);
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if (test->pfn_app)
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ret = sg_alloc_append_table_from_pages(
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&append, pages, test->num_pages, 0, test->size,
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test->max_seg, left_pages, GFP_KERNEL);
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else
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ret = sg_alloc_table_from_pages_segment(
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&append.sgt, pages, test->num_pages, 0,
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test->size, test->max_seg, GFP_KERNEL);
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assert(ret == test->alloc_ret);
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if (test->alloc_ret)
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continue;
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if (test->pfn_app) {
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set_pages(pages, test->pfn_app, test->num_pages);
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ret = sg_alloc_append_table_from_pages(
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&append, pages, test->num_pages, 0, test->size,
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test->max_seg, 0, GFP_KERNEL);
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assert(ret == test->alloc_ret);
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}
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VALIDATE(append.sgt.nents == test->expected_segments,
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&append.sgt, test);
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if (!test->pfn_app)
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VALIDATE(append.sgt.orig_nents ==
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test->expected_segments,
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&append.sgt, test);
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if (test->pfn_app)
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sg_free_append_table(&append);
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else
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sg_free_table(&append.sgt);
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}
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assert(i == (sizeof(tests) / sizeof(tests[0])) - 1);
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return 0;
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}
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