[Intel-gfx] [PATCH igt] igt: Exercise creating context with shared GTT
Chris Wilson
chris at chris-wilson.co.uk
Fri Dec 15 13:30:40 UTC 2017
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
---
tests/Makefile.sources | 1 +
tests/gem_ctx_shared.c | 294 +++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 295 insertions(+)
create mode 100644 tests/gem_ctx_shared.c
diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index e4e06d01d..48b3f4625 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -58,6 +58,7 @@ TESTS_progs = \
gem_ctx_create \
gem_ctx_exec \
gem_ctx_param \
+ gem_ctx_shared \
gem_ctx_switch \
gem_ctx_thrash \
gem_double_irq_loop \
diff --git a/tests/gem_ctx_shared.c b/tests/gem_ctx_shared.c
new file mode 100644
index 000000000..2262fda47
--- /dev/null
+++ b/tests/gem_ctx_shared.c
@@ -0,0 +1,294 @@
+/*
+ * Copyright © 2017 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.
+ *
+ */
+
+#include "igt.h"
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+
+#include <drm.h>
+
+IGT_TEST_DESCRIPTION("Test shared contexts.");
+
+struct local_i915_gem_context_create_v2 {
+ uint32_t ctx_id;
+ uint32_t flags;
+#define I915_GEM_CONTEXT_SHARE_GTT 0x1
+ uint32_t share_ctx;
+ uint32_t pad;
+};
+
+#define LOCAL_IOCTL_I915_GEM_CONTEXT_CREATE DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_CONTEXT_CREATE, struct local_i915_gem_context_create_v2)
+
+static int
+__gem_context_create_shared(int i915, uint32_t share, unsigned int flags,
+ uint32_t *out)
+{
+ struct local_i915_gem_context_create_v2 arg = {
+ .flags = flags,
+ .share_ctx = share,
+ };
+ int err = 0;
+
+ if (igt_ioctl(i915, LOCAL_IOCTL_I915_GEM_CONTEXT_CREATE, &arg))
+ err = -errno;
+
+ *out = arg.ctx_id;
+
+ errno = 0;
+ return err;
+}
+
+static uint32_t
+gem_context_create_shared(int i915, uint32_t share, unsigned int flags)
+{
+ uint32_t ctx;
+
+ igt_assert_eq(__gem_context_create_shared(i915, share, flags, &ctx), 0);
+
+ return ctx;
+}
+
+static void create_shared_gtt(int i915, unsigned int flags)
+#define DETACHED 0x1
+{
+ const uint32_t bbe = MI_BATCH_BUFFER_END;
+ struct drm_i915_gem_exec_object2 obj = {
+ .handle = gem_create(i915, 4096),
+ };
+ struct drm_i915_gem_execbuffer2 execbuf = {
+ .buffers_ptr = to_user_pointer(&obj),
+ .buffer_count = 1,
+ };
+ uint32_t parent, child;
+
+ gem_write(i915, obj.handle, 0, &bbe, sizeof(bbe));
+ gem_execbuf(i915, &execbuf);
+ gem_sync(i915, obj.handle);
+
+ child = flags & DETACHED ? gem_context_create(i915) : 0;
+ igt_until_timeout(2) {
+ parent = flags & DETACHED ? child : 0;
+ child = gem_context_create_shared(i915, parent,
+ I915_GEM_CONTEXT_SHARE_GTT);
+ execbuf.rsvd1 = child;
+ gem_execbuf(i915, &execbuf);
+
+ if (flags & DETACHED) {
+ gem_context_destroy(i915, parent);
+ gem_execbuf(i915, &execbuf);
+ } else {
+ parent = child;
+ gem_context_destroy(i915, parent);
+ }
+
+ execbuf.rsvd1 = parent;
+ igt_assert_eq(__gem_execbuf(i915, &execbuf), -ENOENT);
+ igt_assert_eq(__gem_context_create_shared(i915, parent,
+ I915_GEM_CONTEXT_SHARE_GTT,
+ &parent), -ENOENT);
+ }
+ if (flags & DETACHED)
+ gem_context_destroy(i915, child);
+
+ gem_sync(i915, obj.handle);
+ gem_close(i915, obj.handle);
+}
+
+static int reopen_driver(int fd)
+{
+ char path[256];
+
+ snprintf(path, sizeof(path), "/proc/self/fd/%d", fd);
+ fd = open(path, O_RDWR);
+ igt_assert_lte(0, fd);
+
+ return fd;
+}
+
+static void exhaust_shared_gtt(int i915, unsigned int flags)
+#define EXHAUST_LRC 0x1
+{
+ i915 = reopen_driver(i915);
+
+ igt_fork(pid, 1) {
+ const uint32_t bbe = MI_BATCH_BUFFER_END;
+ struct drm_i915_gem_exec_object2 obj = {
+ .handle = gem_create(i915, 4096)
+ };
+ struct drm_i915_gem_execbuffer2 execbuf = {
+ .buffers_ptr = to_user_pointer(&obj),
+ .buffer_count = 1,
+ };
+ uint32_t parent, child;
+ unsigned long count = 0;
+ int err;
+
+ gem_write(i915, obj.handle, 0, &bbe, sizeof(bbe));
+
+ child = 0;
+ for (;;) {
+ parent = child;
+ err = __gem_context_create_shared(i915, parent,
+ I915_GEM_CONTEXT_SHARE_GTT,
+ &child);
+ if (err)
+ break;
+
+ if (flags & EXHAUST_LRC) {
+ execbuf.rsvd1 = child;
+ err = __gem_execbuf(i915, &execbuf);
+ if (err)
+ break;
+ }
+
+ count++;
+ }
+ gem_sync(i915, obj.handle);
+
+ igt_info("Created %lu shared contexts, before %d (%s)\n",
+ count, err, strerror(-err));
+ }
+ close(i915);
+ igt_waitchildren();
+}
+
+static void exec_shared_gtt(int i915, unsigned int ring)
+{
+ const int gen = intel_gen(intel_get_drm_devid(i915));
+ const uint32_t bbe = MI_BATCH_BUFFER_END;
+ struct drm_i915_gem_exec_object2 obj = {
+ .handle = gem_create(i915, 4096)
+ };
+ struct drm_i915_gem_execbuffer2 execbuf = {
+ .buffers_ptr = to_user_pointer(&obj),
+ .buffer_count = 1,
+ .flags = ring,
+ };
+ uint32_t scratch = obj.handle;
+ uint32_t batch[16];
+ int i;
+
+ gem_require_ring(i915, ring);
+ igt_require(gem_can_store_dword(i915, ring));
+
+ /* Load object into place in the GTT */
+ gem_write(i915, obj.handle, 0, &bbe, sizeof(bbe));
+ gem_execbuf(i915, &execbuf);
+
+ /* Presume nothing causes an eviction in the meantime */
+
+ obj.handle = gem_create(i915, 4096);
+
+ i = 0;
+ batch[i] = MI_STORE_DWORD_IMM | (gen < 6 ? 1 << 22 : 0);
+ if (gen >= 8) {
+ batch[++i] = obj.offset;
+ batch[++i] = 0;
+ } else if (gen >= 4) {
+ batch[++i] = 0;
+ batch[++i] = obj.offset;
+ } else {
+ batch[i]--;
+ batch[++i] = obj.offset;
+ }
+ batch[++i] = 0xc0ffee;
+ batch[++i] = MI_BATCH_BUFFER_END;
+ gem_write(i915, obj.handle, 0, batch, sizeof(batch));
+
+ obj.offset += 4096; /* make sure we don't cause an eviction! */
+ obj.flags |= EXEC_OBJECT_PINNED;
+ execbuf.rsvd1 = gem_context_create_shared(i915, 0,
+ I915_GEM_CONTEXT_SHARE_GTT);
+ if (gen > 3 && gen < 6)
+ execbuf.flags |= I915_EXEC_SECURE;
+
+ gem_execbuf(i915, &execbuf);
+ gem_context_destroy(i915, execbuf.rsvd1);
+ gem_sync(i915, obj.handle); /* write hazard lies */
+ gem_close(i915, obj.handle);
+
+ gem_read(i915, scratch, 0, batch, sizeof(uint32_t));
+ gem_close(i915, scratch);
+
+ igt_assert_eq_u32(*batch, 0xc0ffee);
+}
+
+static bool has_share_gtt(int i915)
+{
+ uint32_t ctx;
+
+ __gem_context_create_shared(i915, 0, I915_GEM_CONTEXT_SHARE_GTT, &ctx);
+ if (ctx)
+ gem_context_destroy(i915, ctx);
+
+ return ctx != 0;
+}
+
+igt_main
+{
+ const struct intel_execution_engine *e;
+ int i915;
+
+ igt_fixture {
+ i915 = drm_open_driver(DRIVER_INTEL);
+ igt_require_gem(i915);
+ }
+
+ igt_subtest_group {
+ igt_fixture {
+ igt_require(has_share_gtt(i915));
+ igt_fork_hang_detector(i915);
+ }
+
+ igt_subtest("create-shared-gtt")
+ create_shared_gtt(i915, 0);
+
+ igt_subtest("detached-shared-gtt")
+ create_shared_gtt(i915, DETACHED);
+
+ igt_subtest("exhaust-shared-gtt")
+ exhaust_shared_gtt(i915, 0);
+
+ igt_subtest("exhaust-shared-gtt-lrc")
+ exhaust_shared_gtt(i915, EXHAUST_LRC);
+
+ for (e = intel_execution_engines; e->name; e++) {
+ igt_subtest_f("exec-shared-gtt-%s", e->name)
+ exec_shared_gtt(i915, e->exec_id | e->flags);
+ }
+
+ igt_fixture {
+ igt_stop_hang_detector();
+ }
+ }
+}
--
2.15.1
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