[igt-dev] [PATCH i-g-t v13 15/16] Verify protected surfaces are dma buffer sharable

[Alan Previn <alan.previn.teres.alexis@intel.com>]

Verify we can export a protected surface from
protected context A into protected context B (with
different client driver handles) and protected
rendering is successful even after prior file
handle is closed (i.e. pxp specific refcounting
works).

Signed-off-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 tests/i915/gem_pxp.c | 102 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)

diff --git a/tests/i915/gem_pxp.c b/tests/i915/gem_pxp.c
index 0ccba6aa..2848e487 100644
--- a/tests/i915/gem_pxp.c
+++ b/tests/i915/gem_pxp.c
@@ -621,6 +621,106 @@ static void test_render_pxp_protsrc_to_protdest(int i915)
 	buf_ops_destroy(bops);
 }
 
+static int export_handle(int fd, uint32_t handle, int *outfd)
+{
+	struct drm_prime_handle args;
+	int ret;
+
+	args.handle = handle;
+	args.flags = DRM_CLOEXEC;
+	args.fd = -1;
+
+	ret = drmIoctl(fd, DRM_IOCTL_PRIME_HANDLE_TO_FD, &args);
+	if (ret)
+		ret = errno;
+	*outfd = args.fd;
+
+	return ret;
+}
+
+static void test_pxp_dmabuffshare_refcnt(void)
+{
+	uint32_t ctx[2], sbo[2], dbo[2];
+	struct intel_buf *sbuf[2], *dbuf[2];
+	struct buf_ops *bops[2];
+	struct intel_bb *ibb[2];
+	int fd[2], dmabuf_fd = 0, ret, n, num_matches = 0;
+	uint32_t encrypted[2][TSTSURF_SIZE/TSTSURF_BYTESPP];
+
+	/* First, create the client driver handles and
+	 * protected dest buffer (is exported via dma-buff
+	 * from first handle and imported to the second).
+	 */
+	for (n = 0; n < 2; ++n) {
+		fd[n] = drm_open_driver(DRIVER_INTEL);
+		igt_require(fd[n]);
+		if (n == 0) {
+			dbo[0] = alloc_and_fill_dest_buff(fd[0], true, TSTSURF_SIZE,
+							  TSTSURF_INITCOLOR1);
+		} else {
+			ret = export_handle(fd[0], dbo[0], &dmabuf_fd);
+			igt_assert(ret == 0);
+			dbo[1] = prime_fd_to_handle(fd[1], dmabuf_fd);
+			igt_assert(dbo[1]);
+		}
+	}
+	/* Repeat twice: Create a full set of assets to perform
+	 * a protected 3D session but using the same dest buffer
+	 * from above.
+	 */
+	for (n = 0; n < 2; ++n) {
+		ret = create_ctx_with_params(fd[n], true, true, true, false, &ctx[n]);
+		igt_assert_eq(ret, 0);
+		igt_assert_eq(get_ctx_protected_param(fd[n], ctx[n]), 1);
+		ibb[n] = intel_bb_create_with_context(fd[n], ctx[n], 4096);
+		intel_bb_set_pxp(ibb[n], true, DISPLAY_APPTYPE,
+				 I915_PROTECTED_CONTENT_DEFAULT_SESSION);
+
+		bops[n] = buf_ops_create(fd[n]);
+		if (n == 1)
+			fill_bo_content(fd[1], dbo[1], TSTSURF_SIZE, TSTSURF_INITCOLOR2);
+
+		dbuf[n] = intel_buf_create_using_handle(bops[n], dbo[n], TSTSURF_WIDTH,
+							TSTSURF_HEIGHT,	TSTSURF_BYTESPP*8, 0,
+							I915_TILING_NONE, 0);
+		intel_buf_set_pxp(dbuf[n], true);
+
+		sbo[n] = alloc_and_fill_dest_buff(fd[n], false, TSTSURF_SIZE, TSTSURF_FILLCOLOR1);
+		sbuf[n] = intel_buf_create_using_handle(bops[n], sbo[n], TSTSURF_WIDTH,
+							TSTSURF_HEIGHT, TSTSURF_BYTESPP*8, 0,
+							I915_TILING_NONE, 0);
+
+		gen12_render_copyfunc(ibb[n], sbuf[n], 0, 0, TSTSURF_WIDTH, TSTSURF_HEIGHT,
+				      dbuf[n], 0, 0);
+		gem_sync(fd[n], dbo[n]);
+
+		assert_bo_content_check(fd[n], dbo[n], COMPARE_COLOR_UNREADIBLE, TSTSURF_SIZE,
+					TSTSURF_FILLCOLOR1, NULL, 0);
+		assert_bo_content_check(fd[n], dbo[n], COPY_BUFFER, TSTSURF_SIZE, 0, encrypted[n],
+					TSTSURF_SIZE);
+
+		/* free up all assets except the dest buffer to
+		 * verify dma buff refcounting is performed on
+		 * the protected dest buffer on the 2nd loop with
+		 * successful reuse in another protected render.
+		 */
+		intel_bb_destroy(ibb[n]);
+		intel_buf_destroy(sbuf[n]);
+		intel_buf_destroy(dbuf[n]);
+		gem_close(fd[n], sbo[n]);
+		gem_close(fd[n], dbo[n]);
+		gem_context_destroy(fd[n], ctx[n]);
+		close(fd[n]);
+	}
+
+	/* Verify that encrypted output across loops were equal */
+	for (n = 0; n < (TSTSURF_SIZE/4); ++n)
+		if (encrypted[0][n] == encrypted[1][n])
+			++num_matches;
+	igt_assert(num_matches == (TSTSURF_SIZE/4));
+}
+
+
 static void init_powermgt_resources(int i915, struct powermgt_data *pm)
 {
 	pm->debugfsdir = igt_debugfs_dir(i915);
@@ -989,6 +1089,8 @@ igt_main
 			test_render_pxp_src_to_protdest(i915);
 		igt_subtest("protected-encrypted-src-copy-not-readible")
 			test_render_pxp_protsrc_to_protdest(i915);
+		igt_subtest("dmabuf-shared-protected-dst-is-context-refcounted")
+			test_pxp_dmabuffshare_refcnt();
 	}
 	igt_subtest_group {
 		igt_fixture {
-- 
2.25.1