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#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 = UINT_MAX;
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;
}
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