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 overly 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
v5: Convert kms_busy to use this api
v6: Add this library to docs
v7: Document global use of batch, reuse defines
Minor code cleanups.
Rename igt_spin_batch and igt_post_spin_batch to
igt_spin_batch_new and igt_spin_batch_free
respectively (Tomeu Vizoso).
Fix error in dependency relocation handling in HSW causing
tests to fail.
v8: Restore correct order of objects in the execbuffer. Batch
object should always be last.
v9 : Add helper to terminate batch manually
v10: Split timeout function. Clarify function names (Chris)
v11: From Chris:
* Add gem_quiescent_gpu exit handler
* Use gem_bo_busy
* Skip spin->handle > 0 checks
* Ensure terminate batch on free
* Remove igt_spin_batch_wait
* Remove single-ring limitation
v12: Hook into gem_quiescent_gpu exit handler to idle the GPU if
the user terminates tests with ^C
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: tomeu@xxxxxxxxxxxxxxx
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@xxxxxxxxxxxxxxx>
---
.../intel-gpu-tools/intel-gpu-tools-docs.xml | 1 +
lib/Makefile.sources | 2 +
lib/drmtest.c | 3 +
lib/igt.h | 1 +
lib/igt_dummyload.c | 302 +++++++++++++++++++++
lib/igt_dummyload.h | 46 ++++
6 files changed, 355 insertions(+)
create mode 100644 lib/igt_dummyload.c
create mode 100644 lib/igt_dummyload.h
diff --git a/docs/reference/intel-gpu-tools/intel-gpu-tools-docs.xml b/docs/reference/intel-gpu-tools/intel-gpu-tools-docs.xml
index c862f2a..55902ab 100644
--- a/docs/reference/intel-gpu-tools/intel-gpu-tools-docs.xml
+++ b/docs/reference/intel-gpu-tools/intel-gpu-tools-docs.xml
@@ -32,6 +32,7 @@
<xi:include href="xml/intel_io.xml"/>
<xi:include href="xml/igt_vc4.xml"/>
<xi:include href="xml/igt_vgem.xml"/>
+ <xi:include href="xml/igt_dummyload.xml"/>
</chapter>
<xi:include href="xml/igt_test_programs.xml"/>
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/drmtest.c b/lib/drmtest.c
index 44abc7e..be1dc93 100644
--- a/lib/drmtest.c
+++ b/lib/drmtest.c
@@ -57,6 +57,7 @@
#include "config.h"
#include "intel_reg.h"
#include "ioctl_wrappers.h"
+#include "igt_dummyload.h"
/**
* SECTION:drmtest
@@ -159,6 +160,8 @@ void gem_quiescent_gpu(int fd)
struct drm_i915_gem_exec_object2 obj;
unsigned ring;
+ igt_terminate_spin_batches();
+
memset(&obj, 0, sizeof(obj));
obj.handle = gem_create(fd, 4096);
gem_write(fd, obj.handle, 0, &bbe, sizeof(&bbe));
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..8270c38
--- /dev/null
+++ b/lib/igt_dummyload.c
@@ -0,0 +1,302 @@
+/*
+ * 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 overly 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 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 const int bo_size = 4096;
+
+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;
+}
+
+/*
+ * Needs to be global. Signal handlers don't accept arguments
+ */
+static uint32_t *batch;
+
+static uint32_t emit_recursive_batch(int fd, int engine,
+ unsigned int 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 int engines[16];
+ unsigned int 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 {
+ gem_require_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, bo_size);
+ batch = gem_mmap__gtt(fd, handle, bo_size, PROT_WRITE);
+ igt_assert(batch);
+ gem_set_domain(fd, handle,
+ I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
+
+ if (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, 256,
+ I915_GEM_DOMAIN_RENDER,
+ I915_GEM_DOMAIN_RENDER);
+ reloc_count++;
+ }
+
+ 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 = engines[i];
+ execbuf.flags &= ~ENGINE_MASK;
+ execbuf.buffer_count = buf_count;
+ gem_execbuf(fd, &execbuf);
+ }
+
+ return handle;
+}
+
+static void exit_batch_handler(int sig, siginfo_t *info, void *spin)
+{
+ *batch = MI_BATCH_BUFFER_END;
+ __sync_synchronize();
+}
+
+int num_spin_objects;
+int spin_objects_sz;
+igt_spin_t **spin_objects;
+
+static void save_spin_batch(igt_spin_t *spin)
+{
+ if (num_spin_objects >= spin_objects_sz) {
+ if (!spin_objects_sz)
+ spin_objects_sz = 4;
+ else
+ spin_objects_sz *= 2;
+
+ spin_objects = realloc(spin_objects,
+ sizeof(igt_spin_t *) * spin_objects_sz);
+ igt_assert(spin_objects);
+ }
+ spin_objects[num_spin_objects++] = spin;
+}
+
+void igt_terminate_spin_batches(void)
+{
+ int i;
+
+ for (i = 0; i < num_spin_objects; i++)
+ igt_spin_batch_end(spin_objects[i]);
+}
+
+/**
+ * igt_spin_batch_new:
+ * @fd: open i915 drm file descriptor
+ * @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. 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_spin_batch_free() for post-processing.
+ *
+ * Returns:
+ * Structure with helper internal state for igt_spin_batch_free().
+ */
+igt_spin_t *
+igt_spin_batch_new(int fd, int engine, unsigned int dep_handle)
+{
+ igt_spin_t *spin = calloc(1, sizeof(struct igt_spin));
+ uint32_t handle = emit_recursive_batch(fd, engine, dep_handle);
+
+ igt_assert(gem_bo_busy(fd, handle));
+ spin->handle = handle;
+ spin->batch = batch;
+ spin->timer = NULL;
+ save_spin_batch(spin);
+
+ return spin;
+}
+
+/**
+ * igt_spin_batch_set_timeout:
+ * @spin: spin batch state from igt_spin_batch_new()
+ * @ns: amount of time in nanoseconds the batch continues to execute
+ * before finishing.
+ *
+ * Specify a timeout. This ends the recursive batch associated with @spin after
+ * the timeout has elapsed.
+ */
+void igt_spin_batch_set_timeout(igt_spin_t *spin, int64_t ns)
+{
+ timer_t timer;
+ struct sigevent sev;
+ struct sigaction act;
+ struct itimerspec its;
+
+ igt_assert(ns > 0);
+ if (!spin)
+ return;
+
+ 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 = exit_batch_handler;
+ 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);
+
+ spin->timer = timer;
+}
+
+/**
+ * igt_spin_batch_end:
+ * @spin: spin batch state from igt_spin_batch_new()
+ *
+ * End the recursive batch associated with @spin manually.
+ */
+void igt_spin_batch_end(igt_spin_t *spin)
+{
+ if (!spin)
+ return;
+
+ *spin->batch = MI_BATCH_BUFFER_END;
+ __sync_synchronize();
+}
+
+/**
+ * igt_spin_batch_free:
+ * @fd: open i915 drm file descriptor
+ * @spin: spin batch state from igt_spin_batch_new()
+ *
+ * This function does the necessary post-processing after starting a recursive
+ * batch with igt_spin_batch_new().
+ */
+void igt_spin_batch_free(int fd, igt_spin_t *spin)
+{
+ if (!spin)
+ return;
+
+ if (spin->timer > 0)
+ timer_delete(spin->timer);
+
+ igt_spin_batch_end(spin);
+ munmap(spin->batch, bo_size);
+ gem_close(fd, spin->handle);
+ free(spin);
+
+ num_spin_objects--;
+}
diff --git a/lib/igt_dummyload.h b/lib/igt_dummyload.h
new file mode 100644
index 0000000..a53a241
--- /dev/null
+++ b/lib/igt_dummyload.h
@@ -0,0 +1,46 @@
+/*
+ * 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 int handle;
+ uint32_t *batch;
+ timer_t timer;
+} igt_spin_t;
+
+
+igt_spin_t *
+igt_spin_batch_new(int fd, int engine, unsigned int dep_handle);
+
+void igt_spin_batch_set_timeout(igt_spin_t *spin, int64_t ns);
+
+void igt_spin_batch_end(igt_spin_t *spin);
+
+void igt_spin_batch_free(int fd, igt_spin_t *spin);
+
+void igt_terminate_spin_batches(void);
+
+#endif /* __IGT_DUMMYLOAD_H__ */
--
2.7.4
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