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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/testing/scatterlist/main.c | |
parent | Initial commit. (diff) | |
download | linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/testing/scatterlist/main.c')
-rw-r--r-- | tools/testing/scatterlist/main.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/tools/testing/scatterlist/main.c b/tools/testing/scatterlist/main.c new file mode 100644 index 000000000..f561aed7c --- /dev/null +++ b/tools/testing/scatterlist/main.c @@ -0,0 +1,102 @@ +#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 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 = SCATTERLIST_MAX_SEGMENT; + struct test *test, tests[] = { + { -EINVAL, 1, pfn(0), PAGE_SIZE, 0, 1 }, + { 0, 1, pfn(0), PAGE_SIZE, PAGE_SIZE + 1, 1 }, + { 0, 1, pfn(0), PAGE_SIZE, sgmax + 1, 1 }, + { 0, 1, pfn(0), PAGE_SIZE, sgmax, 1 }, + { 0, 1, pfn(0), 1, sgmax, 1 }, + { 0, 2, pfn(0, 1), 2 * PAGE_SIZE, sgmax, 1 }, + { 0, 2, pfn(1, 0), 2 * PAGE_SIZE, sgmax, 2 }, + { 0, 3, pfn(0, 1, 2), 3 * PAGE_SIZE, sgmax, 1 }, + { 0, 3, pfn(0, 2, 1), 3 * PAGE_SIZE, sgmax, 3 }, + { 0, 3, pfn(0, 1, 3), 3 * PAGE_SIZE, sgmax, 2 }, + { 0, 3, pfn(1, 2, 4), 3 * PAGE_SIZE, sgmax, 2 }, + { 0, 3, pfn(1, 3, 4), 3 * PAGE_SIZE, sgmax, 2 }, + { 0, 4, pfn(0, 1, 3, 4), 4 * PAGE_SIZE, sgmax, 2 }, + { 0, 5, pfn(0, 1, 3, 4, 5), 5 * PAGE_SIZE, sgmax, 2 }, + { 0, 5, pfn(0, 1, 3, 4, 6), 5 * PAGE_SIZE, sgmax, 3 }, + { 0, 5, pfn(0, 1, 2, 3, 4), 5 * PAGE_SIZE, sgmax, 1 }, + { 0, 5, pfn(0, 1, 2, 3, 4), 5 * PAGE_SIZE, 2 * PAGE_SIZE, 3 }, + { 0, 6, pfn(0, 1, 2, 3, 4, 5), 6 * PAGE_SIZE, 2 * PAGE_SIZE, 3 }, + { 0, 6, pfn(0, 2, 3, 4, 5, 6), 6 * PAGE_SIZE, 2 * PAGE_SIZE, 4 }, + { 0, 6, pfn(0, 1, 3, 4, 5, 6), 6 * PAGE_SIZE, 2 * PAGE_SIZE, 3 }, + { 0, 0, NULL, 0, 0, 0 }, + }; + unsigned int i; + + for (i = 0, test = tests; test->expected_segments; test++, i++) { + struct page *pages[MAX_PAGES]; + struct sg_table st; + struct scatterlist *sg; + + set_pages(pages, test->pfn, test->num_pages); + + sg = __sg_alloc_table_from_pages(&st, pages, test->num_pages, 0, + test->size, test->max_seg, NULL, 0, GFP_KERNEL); + assert(PTR_ERR_OR_ZERO(sg) == test->alloc_ret); + + if (test->alloc_ret) + continue; + + VALIDATE(st.nents == test->expected_segments, &st, test); + VALIDATE(st.orig_nents == test->expected_segments, &st, test); + + sg_free_table(&st); + } + + assert(i == (sizeof(tests) / sizeof(tests[0])) - 1); + + return 0; +} |