[igt-dev] [PATCH i-g-t 10/17] igt: Exercise creating context with shared GTT
Chris Wilson
chris at chris-wilson.co.uk
Mon Jul 2 09:07:20 UTC 2018
v2: Test each shared context is its own timeline and allows request
reordering between shared contexts.
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>
Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
---
lib/i915/gem_context.c | 66 +++
lib/i915/gem_context.h | 13 +
tests/Makefile.sources | 1 +
tests/gem_ctx_shared.c | 896 +++++++++++++++++++++++++++++++++++++++
tests/gem_exec_whisper.c | 32 +-
5 files changed, 999 insertions(+), 9 deletions(-)
create mode 100644 tests/gem_ctx_shared.c
diff --git a/lib/i915/gem_context.c b/lib/i915/gem_context.c
index 669bd318c..02cf2ccf3 100644
--- a/lib/i915/gem_context.c
+++ b/lib/i915/gem_context.c
@@ -273,3 +273,69 @@ void gem_context_set_priority(int fd, uint32_t ctx_id, int prio)
{
igt_assert(__gem_context_set_priority(fd, ctx_id, prio) == 0);
}
+
+struct local_i915_gem_context_create_v2 {
+ uint32_t ctx_id;
+ uint32_t flags;
+ 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)
+
+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 bool __gem_context_has(int i915, uint32_t flags)
+{
+ uint32_t ctx;
+
+ __gem_context_create_shared(i915, 0, flags, &ctx);
+ if (ctx)
+ gem_context_destroy(i915, ctx);
+
+ errno = 0;
+ return ctx;
+}
+
+bool gem_contexts_has_shared_gtt(int i915)
+{
+ return __gem_context_has(i915, I915_GEM_CONTEXT_SHARE_GTT);
+}
+
+bool gem_has_queues(int i915)
+{
+ return __gem_context_has(i915, I915_GEM_CONTEXT_SHARE_GTT);
+}
+
+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;
+}
+
+uint32_t gem_queue_create(int i915)
+{
+ return gem_context_create_shared(i915, 0,
+ I915_GEM_CONTEXT_SHARE_GTT |
+ I915_GEM_CONTEXT_SINGLE_TIMELINE);
+}
diff --git a/lib/i915/gem_context.h b/lib/i915/gem_context.h
index aef68dda6..5ed992a70 100644
--- a/lib/i915/gem_context.h
+++ b/lib/i915/gem_context.h
@@ -29,6 +29,19 @@ int __gem_context_create(int fd, uint32_t *ctx_id);
void gem_context_destroy(int fd, uint32_t ctx_id);
int __gem_context_destroy(int fd, uint32_t ctx_id);
+#define I915_GEM_CONTEXT_SHARE_GTT 0x1
+#define I915_GEM_CONTEXT_SINGLE_TIMELINE 0x2
+
+int __gem_context_create_shared(int i915,
+ uint32_t share, unsigned int flags,
+ uint32_t *out);
+uint32_t gem_context_create_shared(int i915,
+ uint32_t share, unsigned int flags);
+uint32_t gem_queue_create(int i915);
+
+bool gem_contexts_has_shared_gtt(int i915);
+bool gem_has_queues(int i915);
+
bool gem_has_contexts(int fd);
void gem_require_contexts(int fd);
void gem_context_require_bannable(int fd);
diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index 54b4a3c21..08a1caf9d 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -56,6 +56,7 @@ TESTS_progs = \
gem_ctx_exec \
gem_ctx_isolation \
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..9d3239f69
--- /dev/null
+++ b/tests/gem_ctx_shared.c
@@ -0,0 +1,896 @@
+/*
+ * 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>
+
+#include "igt_rand.h"
+#include "igt_vgem.h"
+#include "sync_file.h"
+
+#define LO 0
+#define HI 1
+#define NOISE 2
+
+#define MAX_PRIO LOCAL_I915_CONTEXT_MAX_USER_PRIORITY
+#define MIN_PRIO LOCAL_I915_CONTEXT_MIN_USER_PRIORITY
+
+static int priorities[] = {
+ [LO] = MIN_PRIO / 2,
+ [HI] = MAX_PRIO / 2,
+};
+
+#define BUSY_QLEN 8
+#define MAX_ELSP_QLEN 16
+
+IGT_TEST_DESCRIPTION("Test shared contexts.");
+
+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 void disjoint_timelines(int 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,
+ };
+ struct sync_fence_info parent, child;
+ struct sync_file_info sync_file_info = {
+ .num_fences = 1,
+ };
+
+ /*
+ * Each context, although they share a vm, are expected to be
+ * distinct timelines. A request queued to one context should be
+ * independent of any shared contexts.
+ *
+ * This information is exposed via the sync_file->name which
+ * includes the fence.context.
+ */
+
+ gem_write(i915, obj.handle, 0, &bbe, sizeof(bbe));
+ gem_execbuf(i915, &execbuf);
+ gem_sync(i915, obj.handle);
+
+ execbuf.flags = I915_EXEC_FENCE_OUT;
+ gem_execbuf_wr(i915, &execbuf);
+ sync_file_info.sync_fence_info = to_user_pointer(&parent);
+ do_ioctl(execbuf.rsvd2 >> 32, SYNC_IOC_FILE_INFO, &sync_file_info);
+ close(execbuf.rsvd2 >> 32);
+
+ execbuf.rsvd1 =
+ gem_context_create_shared(i915, 0, I915_GEM_CONTEXT_SHARE_GTT);
+ gem_execbuf_wr(i915, &execbuf);
+ sync_file_info.sync_fence_info = to_user_pointer(&child);
+ do_ioctl(execbuf.rsvd2 >> 32, SYNC_IOC_FILE_INFO, &sync_file_info);
+ close(execbuf.rsvd2 >> 32);
+ gem_context_destroy(i915, execbuf.rsvd1);
+
+ igt_info("Parent fence: %s %s\n", parent.driver_name, parent.obj_name);
+ igt_info("Child fence: %s %s\n", child.driver_name, child.obj_name);
+
+ /* Driver should be the same, but on different timelines */
+ igt_assert(strcmp(parent.driver_name, child.driver_name) == 0);
+ igt_assert(strcmp(parent.obj_name, child.obj_name) != 0);
+
+ 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 int nop_sync(int i915, uint32_t ctx, unsigned int ring, int64_t timeout)
+{
+ 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,
+ .rsvd1 = ctx,
+ };
+ int err;
+
+ gem_write(i915, obj.handle, 0, &bbe, sizeof(bbe));
+ gem_execbuf(i915, &execbuf);
+ err = gem_wait(i915, obj.handle, &timeout);
+ gem_close(i915, obj.handle);
+
+ return err;
+}
+
+static bool has_single_timeline(int i915)
+{
+ uint32_t ctx;
+
+ __gem_context_create_shared(i915, 0,
+ I915_GEM_CONTEXT_SINGLE_TIMELINE, &ctx);
+ if (ctx)
+ gem_context_destroy(i915, ctx);
+
+ return ctx != 0;
+}
+
+static bool ignore_engine(unsigned engine)
+{
+ if (engine == 0)
+ return true;
+
+ if (engine == I915_EXEC_BSD)
+ return true;
+
+ return false;
+}
+
+static void single_timeline(int 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,
+ };
+ struct sync_fence_info rings[16];
+ struct sync_file_info sync_file_info = {
+ .num_fences = 1,
+ };
+ unsigned int engine;
+ int n;
+
+ igt_require(has_single_timeline(i915));
+
+ gem_write(i915, obj.handle, 0, &bbe, sizeof(bbe));
+ gem_execbuf(i915, &execbuf);
+ gem_sync(i915, obj.handle);
+
+ /*
+ * For a "single timeline" context, each ring is on the common
+ * timeline, unlike a normal context where each ring has an
+ * independent timeline. That is no matter which engine we submit
+ * to, it reports the same timeline name and fence context. However,
+ * the fence context is not reported through the sync_fence_info.
+ */
+ execbuf.rsvd1 =
+ gem_context_create_shared(i915, 0,
+ I915_GEM_CONTEXT_SINGLE_TIMELINE);
+ execbuf.flags = I915_EXEC_FENCE_OUT;
+ n = 0;
+ for_each_engine(i915, engine) {
+ gem_execbuf_wr(i915, &execbuf);
+ sync_file_info.sync_fence_info = to_user_pointer(&rings[n]);
+ do_ioctl(execbuf.rsvd2 >> 32, SYNC_IOC_FILE_INFO, &sync_file_info);
+ close(execbuf.rsvd2 >> 32);
+
+ igt_info("ring[%d] fence: %s %s\n",
+ n, rings[n].driver_name, rings[n].obj_name);
+ n++;
+ }
+ gem_sync(i915, obj.handle);
+ gem_close(i915, obj.handle);
+
+ for (int i = 1; i < n; i++) {
+ igt_assert(!strcmp(rings[0].driver_name, rings[i].driver_name));
+ igt_assert(!strcmp(rings[0].obj_name, rings[i].obj_name));
+ }
+}
+
+static void exec_single_timeline(int i915, unsigned int ring)
+{
+ unsigned int other;
+ igt_spin_t *spin;
+ uint32_t ctx;
+
+ gem_require_ring(i915, ring);
+ igt_require(has_single_timeline(i915));
+
+ /*
+ * On an ordinary context, a blockage on one ring doesn't prevent
+ * execution on an other.
+ */
+ ctx = 0;
+ spin = NULL;
+ for_each_engine(i915, other) {
+ if (other == ring || ignore_engine(other))
+ continue;
+
+ if (spin == NULL) {
+ spin = __igt_spin_batch_new(i915, ctx, other, 0);
+ } else {
+ struct drm_i915_gem_exec_object2 obj = {
+ .handle = spin->handle,
+ };
+ struct drm_i915_gem_execbuffer2 execbuf = {
+ .buffers_ptr = to_user_pointer(&obj),
+ .buffer_count = 1,
+ .flags = other,
+ .rsvd1 = ctx,
+ };
+ gem_execbuf(i915, &execbuf);
+ }
+ }
+ igt_require(spin);
+ igt_assert_eq(nop_sync(i915, ctx, ring, NSEC_PER_SEC), 0);
+ igt_spin_batch_free(i915, spin);
+
+ /*
+ * But if we create a context with just a single shared timeline,
+ * then it will block waiting for the earlier requests on the
+ * other engines.
+ */
+ ctx = gem_context_create_shared(i915, 0,
+ I915_GEM_CONTEXT_SINGLE_TIMELINE);
+ spin = NULL;
+ for_each_engine(i915, other) {
+ if (other == ring || ignore_engine(other))
+ continue;
+
+ if (spin == NULL) {
+ spin = __igt_spin_batch_new(i915, ctx, other, 0);
+ } else {
+ struct drm_i915_gem_exec_object2 obj = {
+ .handle = spin->handle,
+ };
+ struct drm_i915_gem_execbuffer2 execbuf = {
+ .buffers_ptr = to_user_pointer(&obj),
+ .buffer_count = 1,
+ .flags = other,
+ .rsvd1 = ctx,
+ };
+ gem_execbuf(i915, &execbuf);
+ }
+ }
+ igt_assert(spin);
+ igt_assert_eq(nop_sync(i915, ctx, ring, NSEC_PER_SEC), -ETIME);
+ igt_spin_batch_free(i915, spin);
+}
+
+static void store_dword(int i915, uint32_t ctx, unsigned ring,
+ uint32_t target, uint32_t offset, uint32_t value,
+ uint32_t cork, unsigned write_domain)
+{
+ const int gen = intel_gen(intel_get_drm_devid(i915));
+ struct drm_i915_gem_exec_object2 obj[3];
+ struct drm_i915_gem_relocation_entry reloc;
+ struct drm_i915_gem_execbuffer2 execbuf;
+ uint32_t batch[16];
+ int i;
+
+ memset(&execbuf, 0, sizeof(execbuf));
+ execbuf.buffers_ptr = to_user_pointer(obj + !cork);
+ execbuf.buffer_count = 2 + !!cork;
+ execbuf.flags = ring;
+ if (gen < 6)
+ execbuf.flags |= I915_EXEC_SECURE;
+ execbuf.rsvd1 = ctx;
+
+ memset(obj, 0, sizeof(obj));
+ obj[0].handle = cork;
+ obj[1].handle = target;
+ obj[2].handle = gem_create(i915, 4096);
+
+ memset(&reloc, 0, sizeof(reloc));
+ reloc.target_handle = obj[1].handle;
+ reloc.presumed_offset = 0;
+ reloc.offset = sizeof(uint32_t);
+ reloc.delta = offset;
+ reloc.read_domains = I915_GEM_DOMAIN_INSTRUCTION;
+ reloc.write_domain = write_domain;
+ obj[2].relocs_ptr = to_user_pointer(&reloc);
+ obj[2].relocation_count = 1;
+
+ i = 0;
+ batch[i] = MI_STORE_DWORD_IMM | (gen < 6 ? 1 << 22 : 0);
+ if (gen >= 8) {
+ batch[++i] = offset;
+ batch[++i] = 0;
+ } else if (gen >= 4) {
+ batch[++i] = 0;
+ batch[++i] = offset;
+ reloc.offset += sizeof(uint32_t);
+ } else {
+ batch[i]--;
+ batch[++i] = offset;
+ }
+ batch[++i] = value;
+ batch[++i] = MI_BATCH_BUFFER_END;
+ gem_write(i915, obj[2].handle, 0, batch, sizeof(batch));
+ gem_execbuf(i915, &execbuf);
+ gem_close(i915, obj[2].handle);
+}
+
+struct cork {
+ int device;
+ uint32_t handle;
+ uint32_t fence;
+};
+
+static void plug(int i915, struct cork *c)
+{
+ struct vgem_bo bo;
+ int dmabuf;
+
+ c->device = drm_open_driver(DRIVER_VGEM);
+
+ bo.width = bo.height = 1;
+ bo.bpp = 4;
+ vgem_create(c->device, &bo);
+ c->fence = vgem_fence_attach(c->device, &bo, VGEM_FENCE_WRITE);
+
+ dmabuf = prime_handle_to_fd(c->device, bo.handle);
+ c->handle = prime_fd_to_handle(i915, dmabuf);
+ close(dmabuf);
+}
+
+static void unplug(struct cork *c)
+{
+ vgem_fence_signal(c->device, c->fence);
+ close(c->device);
+}
+
+static uint32_t create_highest_priority(int i915)
+{
+ uint32_t ctx = gem_context_create(i915);
+
+ /*
+ * If there is no priority support, all contexts will have equal
+ * priority (and therefore the max user priority), so no context
+ * can overtake us, and we effectively can form a plug.
+ */
+ __gem_context_set_priority(i915, ctx, MAX_PRIO);
+
+ return ctx;
+}
+
+static void unplug_show_queue(int i915, struct cork *c, unsigned int engine)
+{
+ igt_spin_t *spin[BUSY_QLEN];
+
+ for (int n = 0; n < ARRAY_SIZE(spin); n++) {
+ uint32_t ctx = create_highest_priority(i915);
+ spin[n] = __igt_spin_batch_new(i915, ctx, engine, 0);
+ gem_context_destroy(i915, ctx);
+ }
+
+ unplug(c); /* batches will now be queued on the engine */
+ igt_debugfs_dump(i915, "i915_engine_info");
+
+ for (int n = 0; n < ARRAY_SIZE(spin); n++)
+ igt_spin_batch_free(i915, spin[n]);
+}
+
+static uint32_t store_timestamp(int i915, uint32_t ctx, unsigned ring)
+{
+ const bool r64b = intel_gen(intel_get_drm_devid(i915)) >= 8;
+ struct drm_i915_gem_exec_object2 obj = {
+ .handle = gem_create(i915, 4096),
+ .relocation_count = 1,
+ };
+ struct drm_i915_gem_relocation_entry reloc = {
+ .target_handle = obj.handle,
+ .offset = 2 * sizeof(uint32_t),
+ .delta = 4092,
+ .read_domains = I915_GEM_DOMAIN_INSTRUCTION,
+ };
+ struct drm_i915_gem_execbuffer2 execbuf = {
+ .buffers_ptr = to_user_pointer(&obj),
+ .buffer_count = 1,
+ .flags = ring,
+ .rsvd1 = ctx,
+ };
+ uint32_t batch[] = {
+ 0x24 << 23 | (1 + r64b), /* SRM */
+ 0x2358,
+ 4092,
+ 0,
+ MI_BATCH_BUFFER_END
+ };
+
+ igt_require(intel_gen(intel_get_drm_devid(i915)) >= 7);
+
+ gem_write(i915, obj.handle, 0, batch, sizeof(batch));
+ obj.relocs_ptr = to_user_pointer(&reloc);
+
+ gem_execbuf(i915, &execbuf);
+
+ return obj.handle;
+}
+
+static void independent(int i915, unsigned ring, unsigned flags)
+{
+ uint32_t handle[2];
+ igt_spin_t *spin;
+
+ spin = igt_spin_batch_new(i915, 0, ring, 0);
+ for (int i = 0; i < 16; i++){
+ struct drm_i915_gem_exec_object2 obj = {
+ .handle = spin->handle
+ };
+ struct drm_i915_gem_execbuffer2 eb = {
+ .buffer_count = 1,
+ .buffers_ptr = to_user_pointer(&obj),
+ .flags = ring,
+ .rsvd1 = gem_context_create(i915),
+ };
+ gem_context_set_priority(i915, eb.rsvd1, MAX_PRIO);
+ gem_execbuf(i915, &eb);
+ gem_context_destroy(i915, eb.rsvd1);
+ }
+
+ for (int i = LO; i <= HI; i++) {
+ uint32_t ctx = gem_queue_create(i915);
+ gem_context_set_priority(i915, ctx, priorities[i]);
+ handle[i] = store_timestamp(i915, ctx, ring);
+ gem_context_destroy(i915, ctx);
+ }
+
+ igt_spin_batch_free(i915, spin);
+
+ for (int i = LO; i <= HI; i++) {
+ uint32_t *ptr;
+
+ ptr = gem_mmap__gtt(i915, handle[i], 4096, PROT_READ);
+ gem_set_domain(i915, handle[i], /* no write hazard lies! */
+ I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
+ gem_close(i915, handle[i]);
+
+ handle[i] = ptr[1023];
+ munmap(ptr, 4096);
+
+ igt_debug("ctx[%d] .prio=%d, timestamp=%u\n",
+ i, priorities[i], handle[i]);
+ }
+
+ igt_assert((int32_t)(handle[HI] - handle[LO]) < 0);
+}
+
+static void reorder(int i915, unsigned ring, unsigned flags)
+#define EQUAL 1
+{
+ struct cork cork;
+ uint32_t scratch;
+ uint32_t *ptr;
+ uint32_t ctx[2];
+
+ ctx[LO] = gem_queue_create(i915);
+ gem_context_set_priority(i915, ctx[LO], MIN_PRIO);
+
+ ctx[HI] = gem_queue_create(i915);
+ gem_context_set_priority(i915, ctx[HI], flags & EQUAL ? MIN_PRIO : 0);
+
+ scratch = gem_create(i915, 4096);
+ plug(i915, &cork);
+
+ /* We expect the high priority context to be executed first, and
+ * so the final result will be value from the low priority context.
+ */
+ store_dword(i915, ctx[LO], ring, scratch, 0, ctx[LO], cork.handle, 0);
+ store_dword(i915, ctx[HI], ring, scratch, 0, ctx[HI], cork.handle, 0);
+
+ unplug_show_queue(i915, &cork, ring);
+
+ gem_context_destroy(i915, ctx[LO]);
+ gem_context_destroy(i915, ctx[HI]);
+
+ ptr = gem_mmap__gtt(i915, scratch, 4096, PROT_READ);
+ gem_set_domain(i915, scratch, /* no write hazard lies! */
+ I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
+ gem_close(i915, scratch);
+
+ if (flags & EQUAL) /* equal priority, result will be fifo */
+ igt_assert_eq_u32(ptr[0], ctx[HI]);
+ else
+ igt_assert_eq_u32(ptr[0], ctx[LO]);
+ munmap(ptr, 4096);
+}
+
+static void promotion(int i915, unsigned ring)
+{
+ struct cork cork;
+ uint32_t result, dep;
+ uint32_t *ptr;
+ uint32_t ctx[3];
+
+ ctx[LO] = gem_queue_create(i915);
+ gem_context_set_priority(i915, ctx[LO], MIN_PRIO);
+
+ ctx[HI] = gem_queue_create(i915);
+ gem_context_set_priority(i915, ctx[HI], 0);
+
+ ctx[NOISE] = gem_queue_create(i915);
+ gem_context_set_priority(i915, ctx[NOISE], MIN_PRIO/2);
+
+ result = gem_create(i915, 4096);
+ dep = gem_create(i915, 4096);
+
+ plug(i915, &cork);
+
+ /* Expect that HI promotes LO, so the order will be LO, HI, NOISE.
+ *
+ * fifo would be NOISE, LO, HI.
+ * strict priority would be HI, NOISE, LO
+ */
+ store_dword(i915, ctx[NOISE], ring, result, 0, ctx[NOISE], cork.handle, 0);
+ store_dword(i915, ctx[LO], ring, result, 0, ctx[LO], cork.handle, 0);
+
+ /* link LO <-> HI via a dependency on another buffer */
+ store_dword(i915, ctx[LO], ring, dep, 0, ctx[LO], 0, I915_GEM_DOMAIN_INSTRUCTION);
+ store_dword(i915, ctx[HI], ring, dep, 0, ctx[HI], 0, 0);
+
+ store_dword(i915, ctx[HI], ring, result, 0, ctx[HI], 0, 0);
+
+ unplug_show_queue(i915, &cork, ring);
+
+ gem_context_destroy(i915, ctx[NOISE]);
+ gem_context_destroy(i915, ctx[LO]);
+ gem_context_destroy(i915, ctx[HI]);
+
+ ptr = gem_mmap__gtt(i915, dep, 4096, PROT_READ);
+ gem_set_domain(i915, dep, /* no write hazard lies! */
+ I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
+ gem_close(i915, dep);
+
+ igt_assert_eq_u32(ptr[0], ctx[HI]);
+ munmap(ptr, 4096);
+
+ ptr = gem_mmap__gtt(i915, result, 4096, PROT_READ);
+ gem_set_domain(i915, result, /* no write hazard lies! */
+ I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
+ gem_close(i915, result);
+
+ igt_assert_eq_u32(ptr[0], ctx[NOISE]);
+ munmap(ptr, 4096);
+}
+
+static void smoketest(int i915, unsigned ring, unsigned timeout)
+{
+ const int ncpus = sysconf(_SC_NPROCESSORS_ONLN);
+ unsigned engines[16];
+ unsigned nengine;
+ unsigned engine;
+ uint32_t scratch;
+ uint32_t *ptr;
+
+ nengine = 0;
+ for_each_engine(i915, engine) {
+ if (ignore_engine(engine))
+ continue;
+
+ engines[nengine++] = engine;
+ }
+ igt_require(nengine);
+
+ scratch = gem_create(i915, 4096);
+ igt_fork(child, ncpus) {
+ unsigned long count = 0;
+ uint32_t ctx;
+
+ hars_petruska_f54_1_random_perturb(child);
+
+ ctx = gem_queue_create(i915);
+ igt_until_timeout(timeout) {
+ int prio;
+
+ prio = hars_petruska_f54_1_random_unsafe_max(MAX_PRIO - MIN_PRIO) + MIN_PRIO;
+ gem_context_set_priority(i915, ctx, prio);
+
+ engine = engines[hars_petruska_f54_1_random_unsafe_max(nengine)];
+ store_dword(i915, ctx, engine, scratch,
+ 8*child + 0, ~child,
+ 0, 0);
+ for (unsigned int step = 0; step < 8; step++)
+ store_dword(i915, ctx, engine, scratch,
+ 8*child + 4, count++,
+ 0, 0);
+ }
+ gem_context_destroy(i915, ctx);
+ }
+ igt_waitchildren();
+
+ ptr = gem_mmap__gtt(i915, scratch, 4096, PROT_READ);
+ gem_set_domain(i915, scratch, /* no write hazard lies! */
+ I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
+ gem_close(i915, scratch);
+
+ for (unsigned n = 0; n < ncpus; n++) {
+ igt_assert_eq_u32(ptr[2*n], ~n);
+ /*
+ * Note this count is approximate due to unconstrained
+ * ordering of the dword writes between engines.
+ *
+ * Take the result with a pinch of salt.
+ */
+ igt_info("Child[%d] completed %u cycles\n", n, ptr[2*n+1]);
+ }
+ munmap(ptr, 4096);
+}
+
+igt_main
+{
+ const struct intel_execution_engine *e;
+ int i915 = -1;
+
+ igt_fixture {
+ i915 = drm_open_driver(DRIVER_INTEL);
+ igt_require_gem(i915);
+ }
+
+ igt_subtest_group {
+ igt_fixture {
+ igt_require(gem_contexts_has_shared_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("disjoint-timelines")
+ disjoint_timelines(i915);
+
+ igt_subtest("single-timeline")
+ single_timeline(i915);
+
+ 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);
+
+ if (!ignore_engine(e->exec_id | e->flags)) {
+ igt_subtest_f("exec-single-timeline-%s",
+ e->name)
+ exec_single_timeline(i915,
+ e->exec_id | e->flags);
+ }
+
+ /*
+ * Check that the shared contexts operate independently,
+ * that is requests on one ("queue") can be scheduled
+ * around another queue. We only check the basics here,
+ * enough to reduce the queue into just another context,
+ * and so rely on gem_exec_schedule to prove the rest.
+ */
+ igt_subtest_group {
+ igt_fixture {
+ gem_require_ring(i915, e->exec_id | e->flags);
+ igt_require(gem_can_store_dword(i915, e->exec_id) | e->flags);
+ igt_require(gem_scheduler_enabled(i915));
+ igt_require(gem_scheduler_has_ctx_priority(i915));
+ }
+
+ igt_subtest_f("Q-independent-%s", e->name)
+ independent(i915, e->exec_id | e->flags, 0);
+
+ igt_subtest_f("Q-in-order-%s", e->name)
+ reorder(i915, e->exec_id | e->flags, EQUAL);
+
+ igt_subtest_f("Q-out-order-%s", e->name)
+ reorder(i915, e->exec_id | e->flags, 0);
+
+ igt_subtest_f("Q-promotion-%s", e->name)
+ promotion(i915, e->exec_id | e->flags);
+
+ igt_subtest_f("Q-smoketest-%s", e->name)
+ smoketest(i915, e->exec_id | e->flags, 5);
+ }
+ }
+
+ igt_subtest("Q-smoketest-all") {
+ igt_require(gem_scheduler_enabled(i915));
+ igt_require(gem_scheduler_has_ctx_priority(i915));
+ smoketest(i915, -1, 30);
+ }
+
+ igt_fixture {
+ igt_stop_hang_detector();
+ }
+ }
+}
diff --git a/tests/gem_exec_whisper.c b/tests/gem_exec_whisper.c
index 81303f847..a41614a7b 100644
--- a/tests/gem_exec_whisper.c
+++ b/tests/gem_exec_whisper.c
@@ -87,6 +87,7 @@ static void verify_reloc(int fd, uint32_t handle,
#define HANG 0x20
#define SYNC 0x40
#define PRIORITY 0x80
+#define QUEUES 0x100
struct hang {
struct drm_i915_gem_exec_object2 obj;
@@ -171,7 +172,7 @@ static void ctx_set_random_priority(int fd, uint32_t ctx)
{
int prio = hars_petruska_f54_1_random_unsafe_max(1024) - 512;
gem_context_set_priority(fd, ctx, prio);
-};
+}
static void whisper(int fd, unsigned engine, unsigned flags)
{
@@ -223,6 +224,9 @@ static void whisper(int fd, unsigned engine, unsigned flags)
if (flags & CONTEXTS)
gem_require_contexts(fd);
+ if (flags & QUEUES)
+ igt_require(gem_has_queues(fd));
+
if (flags & HANG)
init_hang(&hang);
@@ -284,6 +288,10 @@ static void whisper(int fd, unsigned engine, unsigned flags)
for (n = 0; n < 64; n++)
contexts[n] = gem_context_create(fd);
}
+ if (flags & QUEUES) {
+ for (n = 0; n < 64; n++)
+ contexts[n] = gem_queue_create(fd);
+ }
if (flags & FDS) {
for (n = 0; n < 64; n++)
fds[n] = drm_open_driver(DRIVER_INTEL);
@@ -396,7 +404,7 @@ static void whisper(int fd, unsigned engine, unsigned flags)
execbuf.flags &= ~ENGINE_MASK;
execbuf.flags |= engines[rand() % nengine];
}
- if (flags & CONTEXTS) {
+ if (flags & (CONTEXTS | QUEUES)) {
execbuf.rsvd1 = contexts[rand() % 64];
if (flags & PRIORITY)
ctx_set_random_priority(this_fd, execbuf.rsvd1);
@@ -475,7 +483,7 @@ static void whisper(int fd, unsigned engine, unsigned flags)
for (n = 0; n < 64; n++)
close(fds[n]);
}
- if (flags & CONTEXTS) {
+ if (flags & (CONTEXTS | QUEUES)) {
for (n = 0; n < 64; n++)
gem_context_destroy(fd, contexts[n]);
}
@@ -507,18 +515,24 @@ igt_main
{ "chain-forked", CHAIN | FORKED },
{ "chain-interruptible", CHAIN | INTERRUPTIBLE },
{ "chain-sync", CHAIN | SYNC },
- { "contexts", CONTEXTS },
- { "contexts-interruptible", CONTEXTS | INTERRUPTIBLE},
- { "contexts-forked", CONTEXTS | FORKED},
- { "contexts-priority", CONTEXTS | FORKED | PRIORITY },
- { "contexts-chain", CONTEXTS | CHAIN },
- { "contexts-sync", CONTEXTS | SYNC },
{ "fds", FDS },
{ "fds-interruptible", FDS | INTERRUPTIBLE},
{ "fds-forked", FDS | FORKED},
{ "fds-priority", FDS | FORKED | PRIORITY },
{ "fds-chain", FDS | CHAIN},
{ "fds-sync", FDS | SYNC},
+ { "contexts", CONTEXTS },
+ { "contexts-interruptible", CONTEXTS | INTERRUPTIBLE},
+ { "contexts-forked", CONTEXTS | FORKED},
+ { "contexts-priority", CONTEXTS | FORKED | PRIORITY },
+ { "contexts-chain", CONTEXTS | CHAIN },
+ { "contexts-sync", CONTEXTS | SYNC },
+ { "queues", QUEUES },
+ { "queues-interruptible", QUEUES | INTERRUPTIBLE},
+ { "queues-forked", QUEUES | FORKED},
+ { "queues-priority", QUEUES | FORKED | PRIORITY },
+ { "queues-chain", QUEUES | CHAIN },
+ { "queues-sync", QUEUES | SYNC },
{ NULL }
};
int fd;
--
2.18.0
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