A lot of igt testcases need some GPU workload to make sure a race
window is big enough. Unfortunately having a fixed amount of
workload leads to spurious test failures or overtly long runtimes
on some fast/slow platforms. This library contains functionality
to submit GPU workloads that should consume exactly a specific
amount of time.
v2 : Add recursive batch feature from Chris
v3 : Drop auto-tuned stuff. Add bo dependecy to recursive batch
by adding a dummy reloc to the bo as suggested by Ville.
v4: Fix dependency reloc as write instead of read (Ville).
Fix wrong handling of batchbuffer start on ILK causing
test failure
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@xxxxxxxxxxxxxxx>
---
lib/Makefile.sources | 2 +
lib/igt.h | 1 +
lib/igt_dummyload.c | 276 +++++++++++++++++++++++++++++++++++++++++++++++++++
lib/igt_dummyload.h | 42 ++++++++
4 files changed, 321 insertions(+)
create mode 100644 lib/igt_dummyload.c
create mode 100644 lib/igt_dummyload.h
diff --git a/lib/Makefile.sources b/lib/Makefile.sources
index e8e277b..7fc5ec2 100644
--- a/lib/Makefile.sources
+++ b/lib/Makefile.sources
@@ -75,6 +75,8 @@ lib_source_list = \
igt_draw.h \
igt_pm.c \
igt_pm.h \
+ igt_dummyload.c \
+ igt_dummyload.h \
uwildmat/uwildmat.h \
uwildmat/uwildmat.c \
$(NULL)
diff --git a/lib/igt.h b/lib/igt.h
index d751f24..a0028d5 100644
--- a/lib/igt.h
+++ b/lib/igt.h
@@ -32,6 +32,7 @@
#include "igt_core.h"
#include "igt_debugfs.h"
#include "igt_draw.h"
+#include "igt_dummyload.h"
#include "igt_fb.h"
#include "igt_gt.h"
#include "igt_kms.h"
diff --git a/lib/igt_dummyload.c b/lib/igt_dummyload.c
new file mode 100644
index 0000000..b934fd5
--- /dev/null
+++ b/lib/igt_dummyload.c
@@ -0,0 +1,276 @@
+/*
+ * Copyright © 2016 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 "igt_dummyload.h"
+#include <time.h>
+#include <signal.h>
+#include <sys/syscall.h>
+
+/**
+ * SECTION:igt_dummyload
+ * @short_description: Library for submitting GPU workloads
+ * @title: Dummyload
+ * @include: igt.h
+ *
+ * A lot of igt testcases need some GPU workload to make sure a race window is
+ * big enough. Unfortunately having a fixed amount of workload leads to
+ * spurious test failures or overtly long runtimes on some fast/slow platforms.
+ * This library contains functionality to submit GPU workloads that should
+ * consume exactly a specific amount of time.
+ */
+
+#define NSEC_PER_SEC 1000000000L
+
+#define gettid() syscall(__NR_gettid)
+#define sigev_notify_thread_id _sigev_un._tid
+
+#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
+fill_object(struct drm_i915_gem_exec_object2 *obj, uint32_t gem_handle,
+ struct drm_i915_gem_relocation_entry *relocs, uint32_t count)
+{
+ memset(obj, 0, sizeof(*obj));
+ obj->handle = gem_handle;
+ obj->relocation_count = count;
+ obj->relocs_ptr = (uintptr_t)relocs;
+}
+
+static void
+fill_reloc(struct drm_i915_gem_relocation_entry *reloc,
+ uint32_t gem_handle, uint32_t offset,
+ uint32_t read_domains, uint32_t write_domains)
+{
+ reloc->target_handle = gem_handle;
+ reloc->delta = 0;
+ reloc->offset = offset * sizeof(uint32_t);
+ reloc->presumed_offset = 0;
+ reloc->read_domains = read_domains;
+ reloc->write_domain = write_domains;
+}
+
+
+static uint32_t *batch;
+
+static uint32_t emit_recursive_batch(int fd, int engine, unsigned dep_handle)
+{
+ const int gen = intel_gen(intel_get_drm_devid(fd));
+ struct drm_i915_gem_exec_object2 obj[2];
+ struct drm_i915_gem_relocation_entry relocs[2];
+ struct drm_i915_gem_execbuffer2 execbuf;
+ unsigned engines[16];
+ unsigned nengine, handle;
+ int i = 0, reloc_count = 0, buf_count = 0;
+
+ buf_count = 0;
+ nengine = 0;
+ if (engine < 0) {
+ for_each_engine(fd, engine)
+ if (engine)
+ engines[nengine++] = engine;
+ } else {
+ igt_require(gem_has_ring(fd, engine));
+ engines[nengine++] = engine;
+ }
+ igt_require(nengine);
+
+ memset(&execbuf, 0, sizeof(execbuf));
+ memset(obj, 0, sizeof(obj));
+ memset(relocs, 0, sizeof(relocs));
+
+ execbuf.buffers_ptr = (uintptr_t) obj;
+ handle = gem_create(fd, 4096);
+ batch = gem_mmap__gtt(fd, handle, 4096, PROT_WRITE);
+ gem_set_domain(fd, handle,
+ I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
+
+ if (nengine == 1 && dep_handle > 0) {
+ /* dummy write to dependency */
+ fill_object(&obj[buf_count], dep_handle, NULL, 0);
+ buf_count++;
+
+ fill_reloc(&relocs[reloc_count], dep_handle, i,
+ I915_GEM_DOMAIN_RENDER,
+ I915_GEM_DOMAIN_RENDER);
+ batch[i++] = 0; /* reloc */
+ reloc_count++;
+ batch[i++] = MI_NOOP;
+ }
+
+ if (gen >= 8) {
+ batch[i++] = MI_BATCH_BUFFER_START | 1 << 8 | 1;
+ /* recurse */
+ fill_reloc(&relocs[reloc_count], handle, i,
+ I915_GEM_DOMAIN_COMMAND, 0);
+ batch[i++] = 0;
+ batch[i++] = 0;
+ } else if (gen >= 6) {
+ batch[i++] = MI_BATCH_BUFFER_START | 1 << 8;
+ /* recurse */
+ fill_reloc(&relocs[reloc_count], handle, i,
+ I915_GEM_DOMAIN_COMMAND, 0);
+ batch[i++] = 0;
+ } else {
+ batch[i++] = MI_BATCH_BUFFER_START | 2 << 6 |
+ ((gen < 4) ? 1 : 0);
+ /* recurse */
+ fill_reloc(&relocs[reloc_count], handle, i,
+ I915_GEM_DOMAIN_COMMAND, 0);
+ batch[i++] = 0;
+ if (gen < 4)
+ relocs[reloc_count].delta = 1;
+ }
+ reloc_count++;
+
+ fill_object(&obj[buf_count], handle, relocs, reloc_count);
+ buf_count++;
+
+ for (i = 0; i < nengine; i++) {
+ execbuf.flags &= ~ENGINE_MASK;
+ execbuf.flags = engines[i];
+ execbuf.buffer_count = buf_count;
+ gem_execbuf(fd, &execbuf);
+ }
+
+ return handle;
+}
+
+static void sigiter(int sig, siginfo_t *info, void *arg)
+{
+ *batch = MI_BATCH_BUFFER_END;
+ __sync_synchronize();
+}
+
+static timer_t setup_batch_exit_timer(int64_t ns)
+{
+ timer_t timer;
+ struct sigevent sev;
+ struct sigaction act;
+ struct itimerspec its;
+
+ memset(&sev, 0, sizeof(sev));
+ sev.sigev_notify = SIGEV_SIGNAL | SIGEV_THREAD_ID;
+ sev.sigev_notify_thread_id = gettid();
+ sev.sigev_signo = SIGRTMIN + 1;
+ igt_assert(timer_create(CLOCK_MONOTONIC, &sev, &timer) == 0);
+ igt_assert(timer > 0);
+
+ memset(&act, 0, sizeof(act));
+ act.sa_sigaction = sigiter;
+ act.sa_flags = SA_SIGINFO;
+ igt_assert(sigaction(SIGRTMIN + 1, &act, NULL) == 0);
+
+ memset(&its, 0, sizeof(its));
+ its.it_value.tv_sec = ns / NSEC_PER_SEC;
+ its.it_value.tv_nsec = ns % NSEC_PER_SEC;
+ igt_assert(timer_settime(timer, 0, &its, NULL) == 0);
+
+ return timer;
+}
+
+/**
+ * igt_spin_batch:
+ * @fd: open i915 drm file descriptor
+ * @ns: amount of time in nanoseconds the batch executes after terminating.
+ * If value is less than 0, execute batch forever.
+ * @engine: Ring to execute batch OR'd with execbuf flags. If value is less
+ * than 0, execute on all available rings.
+ * @dep_handle: handle to a buffer object dependency. If greater than 0, add a
+ * relocation entry to this buffer within the batch.
+ *
+ * Start a recursive batch on a ring that terminates after an exact amount
+ * of time has elapsed. Immediately returns a #igt_spin_t that contains the
+ * batch's handle that can be waited upon. The returned structure must be passed to
+ * igt_post_spin_batch() for post-processing.
+ *
+ * Returns:
+ * Structure with helper internal state for igt_post_spin_batch().
+ */
+igt_spin_t igt_spin_batch(int fd, int64_t ns, int engine, unsigned dep_handle)
+{
+ timer_t timer;
+ uint32_t handle = emit_recursive_batch(fd, engine, dep_handle);
+ int64_t wait_timeout = 0;
+ igt_assert_eq(gem_wait(fd, handle, &wait_timeout), -ETIME);
+
+ if (ns < 1) {
+ if (ns == 0) {
+ *batch = MI_BATCH_BUFFER_END;
+ __sync_synchronize();
+ return (igt_spin_t){ handle, batch, 0};
+ }
+ return (igt_spin_t){ handle, batch, 0 };
+ }
+ timer = setup_batch_exit_timer(ns);
+
+ return (igt_spin_t){ handle, batch, timer };
+}
+
+/**
+ * igt_post_spin_batch:
+ * @fd: open i915 drm file descriptor
+ * @arg: spin batch state from igt_spin_batch()
+ *
+ * This function does the necessary post-processing after starting a recursive
+ * batch with igt_spin_batch().
+ */
+void igt_post_spin_batch(int fd, igt_spin_t arg)
+{
+ if (arg.handle == 0)
+ return;
+
+ if (arg.timer > 0)
+ timer_delete(arg.timer);
+
+ gem_close(fd, arg.handle);
+ munmap(arg.batch, 4096);
+}
+
+
+/**
+ * igt_spin_batch_wait:
+ * @fd: open i915 drm file descriptor
+ * @ns: amount of time in nanoseconds the batch executes after terminating.
+ * If value is less than 0, execute batch forever.
+ * @engine: ring to execute batch OR'd with execbuf flags. If value is less
+ * than 0, execute on all available rings.
+ * @dep_handle: handle to a buffer object dependency. If greater than 0, include
+ * this buffer on the wait dependency
+ *
+ * This is similar to igt_spin_batch(), but waits on the recursive batch to finish
+ * instead of returning right away. The function also does the necessary
+ * post-processing automatically if set to timeout.
+ */
+void igt_spin_batch_wait(int fd, int64_t ns, int engine, unsigned dep_handle)
+{
+ igt_spin_t spin = igt_spin_batch(fd, ns, engine, dep_handle);
+ int64_t wait_timeout = ns + (0.5 * NSEC_PER_SEC);
+ igt_assert_eq(gem_wait(fd, spin.handle, &wait_timeout), 0);
+
+ igt_post_spin_batch(fd, spin);
+}
diff --git a/lib/igt_dummyload.h b/lib/igt_dummyload.h
new file mode 100644
index 0000000..79ead2c
--- /dev/null
+++ b/lib/igt_dummyload.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright © 2016 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.
+ *
+ */
+
+#ifndef __IGT_DUMMYLOAD_H__
+#define __IGT_DUMMYLOAD_H__
+
+typedef struct igt_spin {
+ unsigned handle;
+ uint32_t *batch;
+ timer_t timer;
+} igt_spin_t;
+
+
+igt_spin_t igt_spin_batch(int fd, int64_t ns, int engine, unsigned dep_handle);
+
+void igt_post_spin_batch(int fd, igt_spin_t arg);
+
+void igt_spin_batch_wait(int fd, int64_t ns, int engine, unsigned dep_handle);
+
+
+#endif /* __IGT_DUMMYLOAD_H__ */
--
2.7.0
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