tools/testing/scatterlist: Test dynamic __sg_alloc_table_from_pages

Add few cases to test the dynamic allocation flow of
__sg_alloc_table_from_pages.

Link: https://lore.kernel.org/r/20201115120650.139277-1-leon@kernel.org
Signed-off-by: Maor Gottlieb <maorg@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

1 files changed, 41 insertions, 23 deletions

diff --git a/tools/testing/scatterlist/main.c b/tools/testing/scatterlist/main.c
index f561aed7c657..2d27e47bbf2f 100644
--- a/tools/testing/scatterlist/main.c
+++ b/tools/testing/scatterlist/main.c
@@ -9,6 +9,7 @@ struct test {
 	int alloc_ret;
 	unsigned num_pages;
 	unsigned *pfn;
+	unsigned *pfn_app;
 	unsigned size;
 	unsigned int max_seg;
 	unsigned int expected_segments;
@@ -52,31 +53,39 @@ 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 },
+		{ -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, 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 page *pages[MAX_PAGES];
 		struct sg_table st;
 		struct scatterlist *sg;
@@ -84,14 +93,23 @@ int main(void)
 		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);
+				test->size, test->max_seg, NULL, left_pages, GFP_KERNEL);
 		assert(PTR_ERR_OR_ZERO(sg) == test->alloc_ret);
 
 		if (test->alloc_ret)
 			continue;
 
+		if (test->pfn_app) {
+			set_pages(pages, test->pfn_app, test->num_pages);
+			sg = __sg_alloc_table_from_pages(&st, pages, test->num_pages, 0,
+					test->size, test->max_seg, sg, 0, GFP_KERNEL);
+
+			assert(PTR_ERR_OR_ZERO(sg) == test->alloc_ret);
+		}
+
 		VALIDATE(st.nents == test->expected_segments, &st, test);
-		VALIDATE(st.orig_nents == test->expected_segments, &st, test);
+		if (!test->pfn_app)
+			VALIDATE(st.orig_nents == test->expected_segments, &st, test);
 
 		sg_free_table(&st);
 	}