tests: Add gem_exec_whisper

A more complicated store variant to stress inter-engine dependencies
(i.e. semaphores and sync). We write a control value from one batch into
the next and then execute it. This is repeated a few times with each
execution happening on a different engine (so the kernel has to
serialise operations between engines) until we finally write the value
out into our scratch buffer where we can check the result, just like a
Chinese whisper.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

2 files changed, 227 insertions, 0 deletions

diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index 7432dbbf..70cfb26b 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -41,6 +41,7 @@ TESTS_progs_M = \
 	gem_exec_store \
 	gem_exec_suspend \
 	gem_exec_reloc \
+	gem_exec_whisper \
 	gem_fenced_exec_thrash \
 	gem_fence_thrash \
 	gem_fence_upload \
diff --git a/tests/gem_exec_whisper.c b/tests/gem_exec_whisper.c
new file mode 100644
index 00000000..ff694b9f
--- /dev/null
+++ b/tests/gem_exec_whisper.c
@@ -0,0 +1,226 @@
+/*
+ * Copyright © 2009 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+/** @file gem_exec_whisper.c
+ *
+ * Pass around a value to write into a scratch buffer between lots of batches
+ */
+
+#include "igt.h"
+#include "igt_gt.h"
+
+#define LOCAL_I915_EXEC_NO_RELOC (1<<11)
+#define LOCAL_I915_EXEC_HANDLE_LUT (1<<12)
+
+#define LOCAL_I915_EXEC_BSD_SHIFT      (13)
+#define LOCAL_I915_EXEC_BSD_MASK       (3 << LOCAL_I915_EXEC_BSD_SHIFT)
+
+#define ENGINE_MASK  (I915_EXEC_RING_MASK | LOCAL_I915_EXEC_BSD_MASK)
+
+static void write_seqno(unsigned offset)
+{
+	uint32_t seqno = UINT32_MAX - offset;
+	FILE *file;
+
+	file = igt_debugfs_fopen("i915_next_seqno", "w");
+	igt_assert(file);
+
+	igt_assert(fprintf(file, "0x%x", seqno) > 0);
+	fclose(file);
+
+	igt_debug("next seqno set to: 0x%x\n", seqno);
+}
+
+static void check_bo(int fd, uint32_t handle)
+{
+	uint32_t *map;
+	int i;
+
+	igt_debug("Verifying result\n");
+	map = gem_mmap__cpu(fd, handle, 0, 4096, PROT_READ);
+	gem_set_domain(fd, handle, I915_GEM_DOMAIN_CPU, 0);
+	for (i = 0; i < 1024; i++)
+		igt_assert_eq(map[i], i);
+	munmap(map, 4096);
+}
+
+static int __gem_context_create(int fd, uint32_t *ctx_id)
+{
+	struct drm_i915_gem_context_create arg;
+	int ret = 0;
+
+	memset(&arg, 0, sizeof(arg));
+	if (drmIoctl(fd, DRM_IOCTL_I915_GEM_CONTEXT_CREATE, &arg))
+		ret = -errno;
+
+	*ctx_id = arg.ctx_id;
+	return ret;
+}
+
+static bool ignore_engine(int gen, unsigned engine)
+{
+	return gen == 6 && (engine & ~(3<<13)) == I915_EXEC_BSD;
+}
+
+#define CONTEXTS 0x1
+
+static void whisper(int fd, unsigned flags)
+{
+	const int gen = intel_gen(intel_get_drm_devid(fd));
+	struct drm_i915_gem_exec_object2 batches[1024];
+	struct drm_i915_gem_relocation_entry inter[1024];
+	struct drm_i915_gem_relocation_entry reloc;
+	uint32_t contexts[64];
+	uint32_t scratch;
+	unsigned engines[16];
+	unsigned nengine;
+	unsigned engine;
+	uint32_t batch[16];
+	int i, n, pass, loc;
+
+	nengine = 0;
+	for_each_engine(fd, engine)
+		if (!ignore_engine(gen, engine)) engines[nengine++] = engine;
+	igt_require(nengine);
+
+	scratch = gem_create(fd, 4096);
+
+	memset(&reloc, 0, sizeof(reloc));
+	reloc.offset = sizeof(uint32_t);
+	reloc.read_domains = I915_GEM_DOMAIN_INSTRUCTION;
+	reloc.write_domain = I915_GEM_DOMAIN_INSTRUCTION;
+
+	i = 0;
+	batch[i] = MI_STORE_DWORD_IMM | (gen < 6 ? 1 << 22 : 0);
+	if (gen >= 8) {
+		batch[++i] = 0;
+		batch[++i] = 0;
+	} else if (gen >= 4) {
+		batch[++i] = 0;
+		batch[++i] = 0;
+		reloc.offset += sizeof(uint32_t);
+	} else {
+		batch[i]--;
+		batch[++i] = 0;
+	}
+	batch[loc = ++i] = 0xc0ffee;
+	batch[++i] = MI_BATCH_BUFFER_END;
+
+	if (flags & CONTEXTS) {
+		igt_require(__gem_context_create(fd, &contexts[0]) == 0);
+		for (n = 1; n < 64; n++)
+			contexts[n] = gem_context_create(fd);
+	}
+
+	memset(batches, 0, sizeof(batches));
+	for (n = 0; n < 1024; n++) {
+		batches[n].handle = gem_create(fd, 4096);
+		inter[n] = reloc;
+		inter[n].delta = sizeof(uint32_t) * loc;
+		batches[n].relocs_ptr = (uintptr_t)&inter[n];
+		batches[n].relocation_count = 1;
+		gem_write(fd, batches[n].handle, 0, batch, sizeof(batch));
+	}
+
+	for (pass = 0; pass < 1024; pass++) {
+		struct drm_i915_gem_exec_object2 tmp[2];
+		struct drm_i915_gem_execbuffer2 execbuf;
+
+		write_seqno(pass);
+
+		memset(&execbuf, 0, sizeof(execbuf));
+		execbuf.buffers_ptr = (uintptr_t)tmp;
+		execbuf.buffer_count = 2;
+		execbuf.flags = 1 << 11 | 1 << 12;
+		if (gen < 6)
+			execbuf.flags |= I915_EXEC_SECURE;
+
+		memset(tmp, 0, sizeof(tmp));
+		tmp[0].handle = scratch;
+		tmp[1].handle = gem_create(fd, 4096);
+		reloc.presumed_offset = 0;
+		reloc.delta = 4*pass;
+		batch[loc] = ~pass;
+		gem_write(fd, tmp[1].handle, 0, batch, sizeof(batch));
+		tmp[1].relocs_ptr = (uintptr_t)&reloc;
+		tmp[1].relocation_count = 1;
+		execbuf.flags &= ~ENGINE_MASK;
+		igt_require(__gem_execbuf(fd, &execbuf) == 0);
+		gem_close(fd, tmp[1].handle);
+
+		batch[loc] = pass;
+		gem_write(fd, batches[0].handle, 0, batch, sizeof(batch));
+		inter[0].presumed_offset = ~0;
+		for (n = 0; n < 1023; n++) {
+			tmp[0] = batches[n+1];
+			tmp[0].relocation_count = 0;
+			tmp[1] = batches[n];
+
+			execbuf.flags &= ~ENGINE_MASK;
+			execbuf.flags |= engines[rand() % nengine];
+			if (flags & CONTEXTS)
+				execbuf.rsvd1 = contexts[rand() % 64];
+			gem_execbuf(fd, &execbuf);
+		}
+		if (flags & CONTEXTS)
+			execbuf.rsvd1 = 0;
+
+		tmp[0].handle = gem_create(fd, 4096);
+		gem_write(fd, tmp[0].handle, 0, batch, sizeof(batch));
+		tmp[1] = batches[n];
+		execbuf.flags &= ~ENGINE_MASK;
+		gem_execbuf(fd, &execbuf);
+
+		tmp[1] = tmp[0];
+		tmp[0].handle = scratch;
+		reloc.presumed_offset = 0;
+		reloc.delta = 4*pass;
+		tmp[1].relocs_ptr = (uintptr_t)&reloc;
+		tmp[1].relocation_count = 1;
+		gem_execbuf(fd, &execbuf);
+		gem_close(fd, tmp[1].handle);
+	}
+
+	check_bo(fd, scratch);
+	gem_close(fd, scratch);
+	for (n = 0; n < 1024; n++)
+		gem_create(fd, batches[n].handle);
+}
+
+igt_main
+{
+	int fd;
+
+	igt_fixture
+		fd = drm_open_driver_master(DRIVER_INTEL);
+
+	igt_subtest("basic")
+		whisper(fd, 0);
+
+	igt_subtest("contexts")
+		whisper(fd, CONTEXTS);
+
+	igt_fixture
+		close(fd);
+}