diff options
Diffstat (limited to 'tests/i915')
| -rw-r--r-- | tests/i915/gem_exec_balancer.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/tests/i915/gem_exec_balancer.c b/tests/i915/gem_exec_balancer.c index 69f0100f..da8aff6d 100644 --- a/tests/i915/gem_exec_balancer.c +++ b/tests/i915/gem_exec_balancer.c @@ -714,6 +714,8 @@ static void bonded(int i915, unsigned int flags) gem_context_destroy(i915, master); } +#define VIRTUAL_ENGINE (1u << 0) + static unsigned int offset_in_page(void *addr) { return (uintptr_t)addr & 4095; @@ -1240,6 +1242,120 @@ static void indices(int i915) gem_quiescent_gpu(i915); } +static void __bonded_early(int i915, uint32_t ctx, + const struct i915_engine_class_instance *siblings, + unsigned int count, + unsigned int flags) +{ + I915_DEFINE_CONTEXT_ENGINES_BOND(bonds[count], 1); + uint32_t handle = batch_create(i915); + struct drm_i915_gem_exec_object2 batch = { + .handle = handle, + }; + struct drm_i915_gem_execbuffer2 execbuf = { + .buffers_ptr = to_user_pointer(&batch), + .buffer_count = 1, + .rsvd1 = ctx, + }; + igt_spin_t *spin; + + memset(bonds, 0, sizeof(bonds)); + for (int n = 0; n < ARRAY_SIZE(bonds); n++) { + bonds[n].base.name = I915_CONTEXT_ENGINES_EXT_BOND; + bonds[n].base.next_extension = + n ? to_user_pointer(&bonds[n - 1]) : 0; + + bonds[n].master = siblings[n]; + bonds[n].num_bonds = 1; + bonds[n].engines[0] = siblings[(n + 1) % count]; + } + + set_load_balancer(i915, ctx, siblings, count, + flags & VIRTUAL_ENGINE ? &bonds : NULL); + + /* A: spin forever on engine 1 */ + spin = igt_spin_new(i915, + .ctx = ctx, + .engine = (flags & VIRTUAL_ENGINE) ? 0 : 1, + .flags = IGT_SPIN_NO_PREEMPTION); + + /* B: runs after A on engine 1 */ + execbuf.flags = I915_EXEC_FENCE_OUT; + execbuf.flags |= spin->execbuf.flags & 63; + gem_execbuf_wr(i915, &execbuf); + + /* B': run in parallel with B on engine 2, i.e. not before A! */ + execbuf.flags = I915_EXEC_FENCE_SUBMIT | I915_EXEC_FENCE_OUT; + if(!(flags & VIRTUAL_ENGINE)) + execbuf.flags |= 2; + execbuf.rsvd2 >>= 32; + gem_execbuf_wr(i915, &execbuf); + + /* C: prevent anything running on engine 2 after B' */ + spin->execbuf.flags = execbuf.flags & 63; + gem_execbuf(i915, &spin->execbuf); + + igt_debugfs_dump(i915, "i915_engine_info"); + + /* D: cancel the spinner from engine 2 (new timeline) */ + set_load_balancer(i915, ctx, siblings, count, NULL); + batch.handle = create_semaphore_to_spinner(i915, spin); + execbuf.flags = 0; + if(!(flags & VIRTUAL_ENGINE)) + execbuf.flags |= 2; + gem_execbuf(i915, &execbuf); + gem_close(i915, batch.handle); + + /* If C runs before D, we never cancel the spinner and so hang */ + gem_sync(i915, handle); + + /* Check the bonded pair completed successfully */ + igt_assert_eq(sync_fence_status(execbuf.rsvd2 & 0xffffffff), 1); + igt_assert_eq(sync_fence_status(execbuf.rsvd2 >> 32), 1); + + close(execbuf.rsvd2); + close(execbuf.rsvd2 >> 32); + + gem_close(i915, handle); + igt_spin_free(i915, spin); +} + +static void bonded_early(int i915) +{ + uint32_t ctx; + + /* + * Our goal is to start the bonded payloads at roughly the same time. + * We do not want to start the secondary batch too early as it will + * do nothing but hog the GPU until the first has a chance to execute. + * So if we were to arbitrary delay the first by running it after a + * spinner... + * + * By using a pair of spinners, we can create a bonded hog that when + * set in motion will fully utilize both engines [if the scheduling is + * incorrect]. We then use a third party submitted after the bonded + * pair to cancel the spinner from the GPU -- if it is unable to run, + * the spinner is never cancelled, and the bonded pair will cause a GPU + * hang. + */ + + ctx = gem_context_create(i915); + + for (int class = 0; class < 32; class++) { + struct i915_engine_class_instance *siblings; + unsigned int count; + + siblings = list_engines(i915, 1u << class, &count); + if (count > 1) { + __bonded_early(i915, ctx, siblings, count, 0); + __bonded_early(i915, ctx, siblings, count, VIRTUAL_ENGINE); + } + free(siblings); + } + + gem_context_destroy(i915, ctx); +} + static void busy(int i915) { uint32_t scratch = gem_create(i915, 4096); @@ -1891,6 +2007,9 @@ igt_main igt_subtest("bonded-semaphore") bonded_semaphore(i915); + igt_subtest("bonded-early") + bonded_early(i915); + igt_fixture { igt_stop_hang_detector(); } |