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* [PATCH i-g-t 1/9] i915_drm.h sync
@ 2019-10-24 10:54 ` Chris Wilson
  0 siblings, 0 replies; 20+ messages in thread
From: Chris Wilson @ 2019-10-24 10:54 UTC (permalink / raw)
  To: intel-gfx

Update to commit fef476f3ab47527a00818ddaf4b46b8c09361111 (not upstream!)
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Mon Aug 5 22:55:44 2019 +0100

    drm/i915: Cancel non-persistent contexts on close

for I915_CONTEXT_PARAM_PERSISTENCE
---
 include/drm-uapi/i915_drm.h | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/include/drm-uapi/i915_drm.h b/include/drm-uapi/i915_drm.h
index 761517f15..7badfa0b1 100644
--- a/include/drm-uapi/i915_drm.h
+++ b/include/drm-uapi/i915_drm.h
@@ -521,6 +521,7 @@ typedef struct drm_i915_irq_wait {
 #define   I915_SCHEDULER_CAP_PRIORITY	(1ul << 1)
 #define   I915_SCHEDULER_CAP_PREEMPTION	(1ul << 2)
 #define   I915_SCHEDULER_CAP_SEMAPHORES	(1ul << 3)
+#define   I915_SCHEDULER_CAP_ENGINE_BUSY_STATS	(1ul << 4)
 
 #define I915_PARAM_HUC_STATUS		 42
 
@@ -1564,6 +1565,21 @@ struct drm_i915_gem_context_param {
  *   i915_context_engines_bond (I915_CONTEXT_ENGINES_EXT_BOND)
  */
 #define I915_CONTEXT_PARAM_ENGINES	0xa
+
+/*
+ * I915_CONTEXT_PARAM_PERSISTENCE:
+ *
+ * Allow the context and active rendering to survive the process until
+ * completion. Persistence allows fire-and-forget clients to queue up a
+ * bunch of work, hand the output over to a display server and the quit.
+ * If the context is not marked as persistent, upon closing (either via
+ * an explicit DRM_I915_GEM_CONTEXT_DESTROY or implicitly from file closure
+ * or process termination), the context and any outstanding requests will be
+ * cancelled (and exported fences for cancelled requests marked as -EIO).
+ *
+ * By default, new contexts allow persistence.
+ */
+#define I915_CONTEXT_PARAM_PERSISTENCE	0xb
 /* Must be kept compact -- no holes and well documented */
 
 	__u64 value;
@@ -2032,8 +2048,10 @@ struct drm_i915_query {
  *           (data[X / 8] >> (X % 8)) & 1
  *
  * - the subslice mask for each slice with one bit per subslice telling
- *   whether a subslice is available. The availability of subslice Y in slice
- *   X can be queried with the following formula :
+ *   whether a subslice is available. Gen12 has dual-subslices, which are
+ *   similar to two gen11 subslices. For gen12, this array represents dual-
+ *   subslices. The availability of subslice Y in slice X can be queried
+ *   with the following formula :
  *
  *           (data[subslice_offset +
  *                 X * subslice_stride +
-- 
2.24.0.rc0

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^ permalink raw reply related	[flat|nested] 20+ messages in thread
* [Intel-gfx] [PATCH i-g-t 1/9] i915_drm.h sync
@ 2019-10-24 10:54 ` Chris Wilson
  0 siblings, 0 replies; 20+ messages in thread
From: Chris Wilson @ 2019-10-24 10:54 UTC (permalink / raw)
  To: intel-gfx

Update to commit fef476f3ab47527a00818ddaf4b46b8c09361111 (not upstream!)
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Mon Aug 5 22:55:44 2019 +0100

    drm/i915: Cancel non-persistent contexts on close

for I915_CONTEXT_PARAM_PERSISTENCE
---
 include/drm-uapi/i915_drm.h | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/include/drm-uapi/i915_drm.h b/include/drm-uapi/i915_drm.h
index 761517f15..7badfa0b1 100644
--- a/include/drm-uapi/i915_drm.h
+++ b/include/drm-uapi/i915_drm.h
@@ -521,6 +521,7 @@ typedef struct drm_i915_irq_wait {
 #define   I915_SCHEDULER_CAP_PRIORITY	(1ul << 1)
 #define   I915_SCHEDULER_CAP_PREEMPTION	(1ul << 2)
 #define   I915_SCHEDULER_CAP_SEMAPHORES	(1ul << 3)
+#define   I915_SCHEDULER_CAP_ENGINE_BUSY_STATS	(1ul << 4)
 
 #define I915_PARAM_HUC_STATUS		 42
 
@@ -1564,6 +1565,21 @@ struct drm_i915_gem_context_param {
  *   i915_context_engines_bond (I915_CONTEXT_ENGINES_EXT_BOND)
  */
 #define I915_CONTEXT_PARAM_ENGINES	0xa
+
+/*
+ * I915_CONTEXT_PARAM_PERSISTENCE:
+ *
+ * Allow the context and active rendering to survive the process until
+ * completion. Persistence allows fire-and-forget clients to queue up a
+ * bunch of work, hand the output over to a display server and the quit.
+ * If the context is not marked as persistent, upon closing (either via
+ * an explicit DRM_I915_GEM_CONTEXT_DESTROY or implicitly from file closure
+ * or process termination), the context and any outstanding requests will be
+ * cancelled (and exported fences for cancelled requests marked as -EIO).
+ *
+ * By default, new contexts allow persistence.
+ */
+#define I915_CONTEXT_PARAM_PERSISTENCE	0xb
 /* Must be kept compact -- no holes and well documented */
 
 	__u64 value;
@@ -2032,8 +2048,10 @@ struct drm_i915_query {
  *           (data[X / 8] >> (X % 8)) & 1
  *
  * - the subslice mask for each slice with one bit per subslice telling
- *   whether a subslice is available. The availability of subslice Y in slice
- *   X can be queried with the following formula :
+ *   whether a subslice is available. Gen12 has dual-subslices, which are
+ *   similar to two gen11 subslices. For gen12, this array represents dual-
+ *   subslices. The availability of subslice Y in slice X can be queried
+ *   with the following formula :
  *
  *           (data[subslice_offset +
  *                 X * subslice_stride +
-- 
2.24.0.rc0

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Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

^ permalink raw reply related	[flat|nested] 20+ messages in thread
* [PATCH i-g-t 2/9] lib/i915: Expose I915_CONTEXT_PARAM_PERSISTENCE
@ 2019-10-24 10:54   ` Chris Wilson
  0 siblings, 0 replies; 20+ messages in thread
From: Chris Wilson @ 2019-10-24 10:54 UTC (permalink / raw)
  To: intel-gfx

Expose a new context parameters to opting out of persistent behaviour.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Andi Shyti <andi.shyti@intel.com>
---
 lib/i915/gem_context.c | 37 +++++++++++++++++++++++++++++++++++++
 lib/i915/gem_context.h |  8 ++++++++
 2 files changed, 45 insertions(+)

diff --git a/lib/i915/gem_context.c b/lib/i915/gem_context.c
index 83c5df961..1fae5191f 100644
--- a/lib/i915/gem_context.c
+++ b/lib/i915/gem_context.c
@@ -272,6 +272,43 @@ void gem_context_set_priority(int fd, uint32_t ctx_id, int prio)
 	igt_assert_eq(__gem_context_set_priority(fd, ctx_id, prio), 0);
 }
 
+/**
+ * __gem_context_set_persistence:
+ * @i915: open i915 drm file descriptor
+ * @ctx: i915 context id
+ * @state: desired persistence
+ *
+ * Declare whether this context is allowed to persist after closing until
+ * its requests are complete (persistent=true) or if it should be
+ * immediately reaped on closing and its requests cancelled
+ * (persistent=false).
+ *
+ * Returns: An integer equal to zero for success and negative for failure
+ */
+int __gem_context_set_persistence(int i915, uint32_t ctx, bool state)
+{
+	struct drm_i915_gem_context_param p = {
+		.ctx_id = ctx,
+		.param = I915_CONTEXT_PARAM_PERSISTENCE,
+		.value = state,
+	};
+
+	return __gem_context_set_param(i915, &p);
+}
+
+/**
+ * __gem_context_set_persistence:
+ * @i915: open i915 drm file descriptor
+ * @ctx: i915 context id
+ * @state: desired persistence
+ *
+ * Like __gem_context_set_persistence(), except we assert on failure.
+ */
+void gem_context_set_persistence(int i915, uint32_t ctx, bool state)
+{
+	igt_assert_eq(__gem_context_set_persistence(i915, ctx, state), 0);
+}
+
 int
 __gem_context_clone(int i915,
 		    uint32_t src, unsigned int share,
diff --git a/lib/i915/gem_context.h b/lib/i915/gem_context.h
index 8043c3401..c0d4c9615 100644
--- a/lib/i915/gem_context.h
+++ b/lib/i915/gem_context.h
@@ -24,6 +24,11 @@
 #ifndef GEM_CONTEXT_H
 #define GEM_CONTEXT_H
 
+#include <stdbool.h>
+#include <stdint.h>
+
+struct drm_i915_gem_context_param;
+
 uint32_t gem_context_create(int fd);
 int __gem_context_create(int fd, uint32_t *ctx_id);
 void gem_context_destroy(int fd, uint32_t ctx_id);
@@ -58,6 +63,9 @@ int __gem_context_get_param(int fd, struct drm_i915_gem_context_param *p);
 int __gem_context_set_priority(int fd, uint32_t ctx, int prio);
 void gem_context_set_priority(int fd, uint32_t ctx, int prio);
 
+int __gem_context_set_persistence(int i915, uint32_t ctx, bool state);
+void gem_context_set_persistence(int i915, uint32_t ctx, bool state);
+
 bool gem_context_has_engine(int fd, uint32_t ctx, uint64_t engine);
 
 #endif /* GEM_CONTEXT_H */
-- 
2.24.0.rc0

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https://lists.freedesktop.org/mailman/listinfo/intel-gfx

^ permalink raw reply related	[flat|nested] 20+ messages in thread
* [Intel-gfx] [PATCH i-g-t 2/9] lib/i915: Expose I915_CONTEXT_PARAM_PERSISTENCE
@ 2019-10-24 10:54   ` Chris Wilson
  0 siblings, 0 replies; 20+ messages in thread
From: Chris Wilson @ 2019-10-24 10:54 UTC (permalink / raw)
  To: intel-gfx

Expose a new context parameters to opting out of persistent behaviour.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Andi Shyti <andi.shyti@intel.com>
---
 lib/i915/gem_context.c | 37 +++++++++++++++++++++++++++++++++++++
 lib/i915/gem_context.h |  8 ++++++++
 2 files changed, 45 insertions(+)

diff --git a/lib/i915/gem_context.c b/lib/i915/gem_context.c
index 83c5df961..1fae5191f 100644
--- a/lib/i915/gem_context.c
+++ b/lib/i915/gem_context.c
@@ -272,6 +272,43 @@ void gem_context_set_priority(int fd, uint32_t ctx_id, int prio)
 	igt_assert_eq(__gem_context_set_priority(fd, ctx_id, prio), 0);
 }
 
+/**
+ * __gem_context_set_persistence:
+ * @i915: open i915 drm file descriptor
+ * @ctx: i915 context id
+ * @state: desired persistence
+ *
+ * Declare whether this context is allowed to persist after closing until
+ * its requests are complete (persistent=true) or if it should be
+ * immediately reaped on closing and its requests cancelled
+ * (persistent=false).
+ *
+ * Returns: An integer equal to zero for success and negative for failure
+ */
+int __gem_context_set_persistence(int i915, uint32_t ctx, bool state)
+{
+	struct drm_i915_gem_context_param p = {
+		.ctx_id = ctx,
+		.param = I915_CONTEXT_PARAM_PERSISTENCE,
+		.value = state,
+	};
+
+	return __gem_context_set_param(i915, &p);
+}
+
+/**
+ * __gem_context_set_persistence:
+ * @i915: open i915 drm file descriptor
+ * @ctx: i915 context id
+ * @state: desired persistence
+ *
+ * Like __gem_context_set_persistence(), except we assert on failure.
+ */
+void gem_context_set_persistence(int i915, uint32_t ctx, bool state)
+{
+	igt_assert_eq(__gem_context_set_persistence(i915, ctx, state), 0);
+}
+
 int
 __gem_context_clone(int i915,
 		    uint32_t src, unsigned int share,
diff --git a/lib/i915/gem_context.h b/lib/i915/gem_context.h
index 8043c3401..c0d4c9615 100644
--- a/lib/i915/gem_context.h
+++ b/lib/i915/gem_context.h
@@ -24,6 +24,11 @@
 #ifndef GEM_CONTEXT_H
 #define GEM_CONTEXT_H
 
+#include <stdbool.h>
+#include <stdint.h>
+
+struct drm_i915_gem_context_param;
+
 uint32_t gem_context_create(int fd);
 int __gem_context_create(int fd, uint32_t *ctx_id);
 void gem_context_destroy(int fd, uint32_t ctx_id);
@@ -58,6 +63,9 @@ int __gem_context_get_param(int fd, struct drm_i915_gem_context_param *p);
 int __gem_context_set_priority(int fd, uint32_t ctx, int prio);
 void gem_context_set_priority(int fd, uint32_t ctx, int prio);
 
+int __gem_context_set_persistence(int i915, uint32_t ctx, bool state);
+void gem_context_set_persistence(int i915, uint32_t ctx, bool state);
+
 bool gem_context_has_engine(int fd, uint32_t ctx, uint64_t engine);
 
 #endif /* GEM_CONTEXT_H */
-- 
2.24.0.rc0

_______________________________________________
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Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

^ permalink raw reply related	[flat|nested] 20+ messages in thread
* [PATCH i-g-t 3/9] Add i915/gem_ctx_persistence
@ 2019-10-24 10:54   ` Chris Wilson
  0 siblings, 0 replies; 20+ messages in thread
From: Chris Wilson @ 2019-10-24 10:54 UTC (permalink / raw)
  To: intel-gfx

Sanity test existing persistence and new exciting non-persistent context
behaviour.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Cc: Jon Bloomfield <jon.bloomfield@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Andi Shyti <andi.shyti@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@intel.com>
---
 tests/Makefile.sources           |   3 +
 tests/i915/gem_ctx_persistence.c | 538 +++++++++++++++++++++++++++++++
 tests/meson.build                |   1 +
 3 files changed, 542 insertions(+)
 create mode 100644 tests/i915/gem_ctx_persistence.c

diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index 343be0500..093eb57f3 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -154,6 +154,9 @@ gem_ctx_isolation_SOURCES = i915/gem_ctx_isolation.c
 TESTS_progs += gem_ctx_param
 gem_ctx_param_SOURCES = i915/gem_ctx_param.c
 
+TESTS_progs += gem_ctx_persistence
+gem_ctx_persistence_SOURCES = i915/gem_ctx_persistence.c
+
 TESTS_progs += gem_ctx_shared
 gem_ctx_shared_SOURCES = i915/gem_ctx_shared.c
 
diff --git a/tests/i915/gem_ctx_persistence.c b/tests/i915/gem_ctx_persistence.c
new file mode 100644
index 000000000..2780d53cc
--- /dev/null
+++ b/tests/i915/gem_ctx_persistence.c
@@ -0,0 +1,538 @@
+/*
+ * Copyright © 2019 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 <errno.h>
+#include <sched.h>
+#include <signal.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "drmtest.h" /* gem_quiescent_gpu()! */
+#include "i915/gem_context.h"
+#include "i915/gem_submission.h"
+#include "igt_debugfs.h"
+#include "igt_dummyload.h"
+#include "igt_sysfs.h"
+#include "ioctl_wrappers.h" /* gem_wait()! */
+#include "sw_sync.h"
+
+static bool has_persistence(int i915)
+{
+	struct drm_i915_gem_context_param p = {
+		.param = I915_CONTEXT_PARAM_PERSISTENCE,
+	};
+	uint64_t saved;
+
+	if (__gem_context_get_param(i915, &p))
+		return false;
+
+	saved = p.value;
+	p.value = 0;
+	if (__gem_context_set_param(i915, &p))
+		return false;
+
+	p.value = saved;
+	return __gem_context_set_param(i915, &p) == 0;
+}
+
+static bool __enable_hangcheck(int dir, bool state)
+{
+	return igt_sysfs_set(dir, "enable_hangcheck", state ? "1" : "0");
+}
+
+static void enable_hangcheck(int i915)
+{
+	int dir;
+
+	dir = igt_sysfs_open_parameters(i915);
+	if (dir < 0) /* no parameters, must be default! */
+		return;
+
+	/* If i915.hangcheck is removed, assume the default is good */
+	__enable_hangcheck(dir, true);
+	close(dir);
+}
+
+static void test_idempotent(int i915)
+{
+	struct drm_i915_gem_context_param p = {
+		.param = I915_CONTEXT_PARAM_PERSISTENCE,
+	};
+	int expected;
+
+	/*
+	 * Simple test to verify that we are able to read back the same boolean
+	 * value as we set.
+	 *
+	 * Each time we invert the current value so that at the end of the test,
+	 * if successful, we leave the context in the original state.
+	 */
+
+	gem_context_get_param(i915, &p);
+	expected = !!p.value;
+
+	expected = !expected;
+	p.value = expected;
+	gem_context_set_param(i915, &p);
+	gem_context_get_param(i915, &p);
+	igt_assert_eq(p.value, expected);
+
+	expected = !expected; /* and restores */
+	p.value = expected;
+	gem_context_set_param(i915, &p);
+	gem_context_get_param(i915, &p);
+	igt_assert_eq(p.value, expected);
+}
+
+static void test_persistence(int i915)
+{
+	igt_spin_t *spin;
+	int64_t timeout;
+	uint32_t ctx;
+
+	/*
+	 * Default behaviour are contexts remain alive until their last active
+	 * request is retired -- no early termination.
+	 */
+
+	ctx = gem_context_create(i915);
+	gem_context_set_persistence(i915, ctx, true);
+
+	spin = igt_spin_new(i915, ctx, .flags = IGT_SPIN_FENCE_OUT);
+	gem_context_destroy(i915, ctx);
+
+	timeout = NSEC_PER_SEC / 5;
+	igt_assert_eq(gem_wait(i915, spin->handle, &timeout), -ETIME);
+
+	igt_spin_end(spin);
+
+	timeout = NSEC_PER_SEC / 5;
+	igt_assert_eq(gem_wait(i915, spin->handle, &timeout), 0);
+	igt_assert_eq(sync_fence_status(spin->out_fence), 1);
+
+	igt_spin_free(i915, spin);
+	gem_quiescent_gpu(i915);
+}
+
+static void test_nonpersistent_cleanup(int i915)
+{
+	int64_t timeout = NSEC_PER_SEC / 5;
+	igt_spin_t *spin;
+	uint32_t ctx;
+
+	/*
+	 * A nonpersistent context is terminated immediately upon closure,
+	 * any inflight request is cancelled.
+	 */
+
+	ctx = gem_context_create(i915);
+	gem_context_set_persistence(i915, ctx, false);
+
+	spin = igt_spin_new(i915, ctx, .flags = IGT_SPIN_FENCE_OUT);
+	gem_context_destroy(i915, ctx);
+
+	igt_assert_eq(gem_wait(i915, spin->handle, &timeout), 0);
+	igt_assert_eq(sync_fence_status(spin->out_fence), -EIO);
+
+	igt_spin_free(i915, spin);
+	gem_quiescent_gpu(i915);
+}
+
+static void test_nonpersistent_mixed(int i915)
+{
+	int fence[3];
+
+	/*
+	 * Only a nonpersistent context is terminated immediately upon
+	 * closure, any inflight request is cancelled. If there is also
+	 * an active persistent context closed, it should be unafffected.
+	 */
+
+	for (int i = 0; i < ARRAY_SIZE(fence); i++) {
+		igt_spin_t *spin;
+		uint32_t ctx;
+
+		ctx = gem_context_create(i915);
+		gem_context_set_persistence(i915, ctx, i & 1);
+
+		spin = igt_spin_new(i915, ctx, .flags = IGT_SPIN_FENCE_OUT);
+		gem_context_destroy(i915, ctx);
+
+		fence[i] = spin->out_fence;
+	}
+
+	/* Outer pair of contexts were non-persistent and killed */
+	igt_assert_eq(sync_fence_wait(fence[0], MSEC_PER_SEC / 5), 0);
+	igt_assert_eq(sync_fence_status(fence[0]), -EIO);
+
+	igt_assert_eq(sync_fence_wait(fence[2], MSEC_PER_SEC / 5), 0);
+	igt_assert_eq(sync_fence_status(fence[2]), -EIO);
+
+	/* But the middle context is still running */
+	igt_assert_eq(sync_fence_wait(fence[1], 0), -ETIME);
+
+	gem_quiescent_gpu(i915);
+}
+
+static void test_nonpersistent_hostile(int i915)
+{
+	int64_t timeout = NSEC_PER_SEC / 2;
+	igt_spin_t *spin;
+	uint32_t ctx;
+
+	/*
+	 * If we cannot cleanly cancel the non-persistent context on closure,
+	 * e.g. preemption fails, we are forced to reset the GPU to terminate
+	 * the requests and cleanup the context.
+	 */
+
+	ctx = gem_context_create(i915);
+	gem_context_set_persistence(i915, ctx, false);
+
+	spin = igt_spin_new(i915, ctx, .flags = IGT_SPIN_NO_PREEMPTION);
+	gem_context_destroy(i915, ctx);
+
+	igt_assert_eq(gem_wait(i915, spin->handle, &timeout), 0);
+
+	igt_spin_free(i915, spin);
+	gem_quiescent_gpu(i915);
+}
+
+static void test_nonpersistent_hostile_preempt(int i915)
+{
+	int64_t timeout = NSEC_PER_SEC / 2;
+	igt_spin_t *spin[2];
+	uint32_t ctx;
+
+	/*
+	 * Double plus ungood.
+	 *
+	 * Here we would not be able to cancel the hostile non-persistent
+	 * context and we cannot preempt-to-idle as it is already waiting
+	 * on preemption for itself. Let's hope the kernel can save the
+	 * day with a reset.
+	 */
+
+	igt_require(gem_scheduler_has_preemption(i915));
+
+	ctx = gem_context_create(i915);
+	gem_context_set_persistence(i915, ctx, true);
+	gem_context_set_priority(i915, ctx, 0);
+	spin[0] = igt_spin_new(i915, ctx,
+			       .flags = (IGT_SPIN_NO_PREEMPTION |
+					 IGT_SPIN_POLL_RUN));
+	gem_context_destroy(i915, ctx);
+
+	igt_spin_busywait_until_started(spin[0]);
+
+	ctx = gem_context_create(i915);
+	gem_context_set_persistence(i915, ctx, false);
+	gem_context_set_priority(i915, ctx, 1); /* higher priority than 0 */
+	spin[1] = igt_spin_new(i915, ctx, .flags = IGT_SPIN_NO_PREEMPTION);
+	gem_context_destroy(i915, ctx);
+
+	igt_assert_eq(gem_wait(i915, spin[1]->handle, &timeout), 0);
+
+	igt_spin_free(i915, spin[1]);
+	igt_spin_free(i915, spin[0]);
+	gem_quiescent_gpu(i915);
+}
+
+static void test_nohangcheck_hostile(int i915)
+{
+	int64_t timeout = NSEC_PER_SEC / 2;
+	igt_spin_t *spin;
+	uint32_t ctx;
+	int dir;
+
+	/*
+	 * Even if the user disables hangcheck during their context,
+	 * we forcibly terminate that context.
+	 */
+
+	dir = igt_sysfs_open_parameters(i915);
+	igt_require(dir != -1);
+
+	ctx = gem_context_create(i915);
+
+	igt_require(__enable_hangcheck(dir, false));
+
+	spin = igt_spin_new(i915, ctx, .flags = IGT_SPIN_NO_PREEMPTION);
+	gem_context_destroy(i915, ctx);
+
+	igt_assert_eq(gem_wait(i915, spin->handle, &timeout), 0);
+
+	igt_require(__enable_hangcheck(dir, true));
+
+	igt_spin_free(i915, spin);
+	gem_quiescent_gpu(i915);
+	close(dir);
+}
+
+static void test_nonpersistent_file(int i915)
+{
+	int debugfs = i915;
+	igt_spin_t *spin;
+	uint32_t ctx;
+
+	/*
+	 * A context may live beyond its initial struct file, except if it
+	 * has been made nonpersistent, in which case it must be terminated.
+	 */
+
+	i915 = gem_reopen_driver(i915);
+	gem_quiescent_gpu(i915);
+
+	ctx = gem_context_create(i915);
+	gem_context_set_persistence(i915, ctx, false);
+
+	spin = igt_spin_new(i915, ctx, .flags = IGT_SPIN_FENCE_OUT);
+
+	close(i915);
+	rcu_barrier(debugfs); /* force the delayed fput() */
+
+	igt_assert_eq(sync_fence_wait(spin->out_fence, MSEC_PER_SEC / 5), 0);
+	igt_assert_eq(sync_fence_status(spin->out_fence), -EIO);
+
+	spin->handle = 0;
+	igt_spin_free(-1, spin);
+}
+
+static void sendfd(int socket, int fd)
+{
+	char buf[CMSG_SPACE(sizeof(fd))];
+	struct iovec io = { .iov_base = (char *)"ABC", .iov_len = 3 };
+	struct msghdr msg = {
+		.msg_iov = &io,
+		.msg_iovlen = 1,
+		.msg_control = buf,
+		.msg_controllen = CMSG_LEN(sizeof(fd)),
+	};
+	struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
+
+	cmsg->cmsg_level = SOL_SOCKET;
+	cmsg->cmsg_type = SCM_RIGHTS;
+	cmsg->cmsg_len = msg.msg_controllen;
+	*(int *)CMSG_DATA(cmsg) = fd;
+
+	igt_assert(sendmsg(socket, &msg, 0) != -1);
+}
+
+static int recvfd(int socket)
+{
+	char m_buffer[256], c_buffer[256];
+	struct iovec io = {
+		.iov_base = m_buffer,
+		.iov_len = sizeof(m_buffer),
+	};
+	struct msghdr msg = {
+		.msg_iov = &io,
+		.msg_iovlen = 1,
+		.msg_control = c_buffer,
+		.msg_controllen = sizeof(c_buffer),
+	};
+
+	igt_assert(recvmsg(socket, &msg, 0) != -1);
+	return *(int *)CMSG_DATA(CMSG_FIRSTHDR(&msg));
+}
+
+static void test_nonpersistent_process(int i915)
+{
+	int fence[2], sv[2];
+
+	/*
+	 * If a process dies early, any nonpersistent contexts it had
+	 * open must be terminated too. But any persistent contexts,
+	 * should survive until their requests are complete.
+	 */
+
+	igt_require(socketpair(AF_UNIX, SOCK_DGRAM, 0, sv) == 0);
+
+	igt_fork(child, 1) {
+		i915 = gem_reopen_driver(i915);
+		gem_quiescent_gpu(i915);
+
+		for (int persists = 0; persists <= 1; persists++) {
+			igt_spin_t *spin;
+			uint32_t ctx;
+
+			ctx = gem_context_create(i915);
+			gem_context_set_persistence(i915, ctx, persists);
+
+			spin = igt_spin_new(i915, ctx,
+					    .flags = IGT_SPIN_FENCE_OUT);
+
+			sendfd(sv[0], spin->out_fence);
+
+			igt_list_del(&spin->link); /* prevent autocleanup */
+		}
+	}
+	close(sv[0]);
+	igt_waitchildren();
+
+	fence[0] = recvfd(sv[1]);
+	fence[1] = recvfd(sv[1]);
+	close(sv[1]);
+
+	/* First fence is non-persistent, so should be reset */
+	igt_assert_eq(sync_fence_wait(fence[0], MSEC_PER_SEC / 5), 0);
+	igt_assert_eq(sync_fence_status(fence[0]), -EIO);
+	close(fence[0]);
+
+	/* Second fence is persistent, so should be still spinning */
+	igt_assert_eq(sync_fence_wait(fence[1], 0), -ETIME);
+	close(fence[1]);
+
+	/* We have to manually clean up the orphaned spinner */
+	igt_drop_caches_set(i915, DROP_RESET_ACTIVE);
+
+	gem_quiescent_gpu(i915);
+}
+
+static void sigign(int sig)
+{
+}
+
+static void test_mixed_process(int i915)
+{
+	struct {
+		int sv[2];
+	} p[2];
+
+	/*
+	 * If one process dies early and triggers its nonpersistent
+	 * context are cleaned up, but it should not affect a second process.
+	 */
+
+	gem_quiescent_gpu(i915);
+	for (int i = 0; i < ARRAY_SIZE(p); i++) {
+		igt_require(socketpair(AF_UNIX, SOCK_DGRAM, 0, p[i].sv) == 0);
+
+		igt_fork(child, 1) {
+			igt_spin_t *spin;
+			int pid;
+
+			i915 = gem_reopen_driver(i915);
+			gem_context_set_persistence(i915, 0, i);
+
+			spin = igt_spin_new(i915, .flags = IGT_SPIN_FENCE_OUT);
+			/* prevent autocleanup */
+			igt_list_del(&spin->link);
+
+			sendfd(p[i].sv[0], spin->out_fence);
+
+			/* Wait until we are told to die */
+			pid = getpid();
+			write(p[i].sv[0], &pid, sizeof(pid));
+			signal(SIGINT, sigign);
+			pause();
+		}
+	}
+
+	for (int i = 0; i < ARRAY_SIZE(p); i++) {
+		int fence, pid;
+
+		/* The process is not dead yet, so the context can spin. */
+		fence = recvfd(p[i].sv[1]);
+		igt_assert_eq(sync_fence_wait(fence, 0), -ETIME);
+
+		/* Kill *this* process */
+		read(p[i].sv[1], &pid, sizeof(pid));
+		igt_assert(kill(pid, SIGINT) == 0);
+
+		/*
+		 * A little bit of slack required for the signal to terminate
+		 * the process and for the system to cleanup the fd.
+		 */
+		sched_yield();
+		close(p[i].sv[0]);
+		close(p[i].sv[1]);
+		rcu_barrier(i915);
+
+		if (i == 0) {
+			/* First process is non-persistent, so should be reset */
+			igt_assert_eq(sync_fence_wait(fence,
+						      MSEC_PER_SEC / 5), 0);
+			igt_assert_eq(sync_fence_status(fence), -EIO);
+		} else {
+			/* Second fence is persistent, so still spinning */
+			igt_assert_eq(sync_fence_wait(fence, 0), -ETIME);
+		}
+		close(fence);
+	}
+	igt_waitchildren();
+
+	/* We have to manually clean up the orphaned spinner */
+	igt_drop_caches_set(i915, DROP_RESET_ACTIVE);
+	gem_quiescent_gpu(i915);
+}
+
+igt_main
+{
+	int i915;
+
+	igt_fixture {
+		i915 = drm_open_driver(DRIVER_INTEL);
+		igt_require_gem(i915);
+
+		igt_require(has_persistence(i915));
+		enable_hangcheck(i915);
+	}
+
+	igt_subtest_group {
+		igt_subtest("idempotent")
+			test_idempotent(i915);
+
+		igt_subtest("persistence")
+			test_persistence(i915);
+
+		igt_subtest("cleanup")
+			test_nonpersistent_cleanup(i915);
+
+		igt_subtest("mixed")
+			test_nonpersistent_mixed(i915);
+
+		igt_subtest("hostile")
+			test_nonpersistent_hostile(i915);
+
+		igt_subtest("hostile-preempt")
+			test_nonpersistent_hostile_preempt(i915);
+
+		igt_subtest("hangcheck")
+			test_nohangcheck_hostile(i915);
+
+		igt_subtest("file")
+			test_nonpersistent_file(i915);
+
+		igt_subtest("process")
+			test_nonpersistent_process(i915);
+
+		igt_subtest("mixed-processes")
+			test_mixed_process(i915);
+	}
+
+	igt_fixture {
+		close(i915);
+	}
+}
diff --git a/tests/meson.build b/tests/meson.build
index 7e3f9e0a4..3f3eee277 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -121,6 +121,7 @@ i915_progs = [
 	'gem_ctx_exec',
 	'gem_ctx_isolation',
 	'gem_ctx_param',
+	'gem_ctx_persistence',
 	'gem_ctx_shared',
 	'gem_ctx_switch',
 	'gem_ctx_thrash',
-- 
2.24.0.rc0

_______________________________________________
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^ permalink raw reply related	[flat|nested] 20+ messages in thread
* [Intel-gfx] [PATCH i-g-t 3/9] Add i915/gem_ctx_persistence
@ 2019-10-24 10:54   ` Chris Wilson
  0 siblings, 0 replies; 20+ messages in thread
From: Chris Wilson @ 2019-10-24 10:54 UTC (permalink / raw)
  To: intel-gfx

Sanity test existing persistence and new exciting non-persistent context
behaviour.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Cc: Jon Bloomfield <jon.bloomfield@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Andi Shyti <andi.shyti@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@intel.com>
---
 tests/Makefile.sources           |   3 +
 tests/i915/gem_ctx_persistence.c | 538 +++++++++++++++++++++++++++++++
 tests/meson.build                |   1 +
 3 files changed, 542 insertions(+)
 create mode 100644 tests/i915/gem_ctx_persistence.c

diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index 343be0500..093eb57f3 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -154,6 +154,9 @@ gem_ctx_isolation_SOURCES = i915/gem_ctx_isolation.c
 TESTS_progs += gem_ctx_param
 gem_ctx_param_SOURCES = i915/gem_ctx_param.c
 
+TESTS_progs += gem_ctx_persistence
+gem_ctx_persistence_SOURCES = i915/gem_ctx_persistence.c
+
 TESTS_progs += gem_ctx_shared
 gem_ctx_shared_SOURCES = i915/gem_ctx_shared.c
 
diff --git a/tests/i915/gem_ctx_persistence.c b/tests/i915/gem_ctx_persistence.c
new file mode 100644
index 000000000..2780d53cc
--- /dev/null
+++ b/tests/i915/gem_ctx_persistence.c
@@ -0,0 +1,538 @@
+/*
+ * Copyright © 2019 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 <errno.h>
+#include <sched.h>
+#include <signal.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "drmtest.h" /* gem_quiescent_gpu()! */
+#include "i915/gem_context.h"
+#include "i915/gem_submission.h"
+#include "igt_debugfs.h"
+#include "igt_dummyload.h"
+#include "igt_sysfs.h"
+#include "ioctl_wrappers.h" /* gem_wait()! */
+#include "sw_sync.h"
+
+static bool has_persistence(int i915)
+{
+	struct drm_i915_gem_context_param p = {
+		.param = I915_CONTEXT_PARAM_PERSISTENCE,
+	};
+	uint64_t saved;
+
+	if (__gem_context_get_param(i915, &p))
+		return false;
+
+	saved = p.value;
+	p.value = 0;
+	if (__gem_context_set_param(i915, &p))
+		return false;
+
+	p.value = saved;
+	return __gem_context_set_param(i915, &p) == 0;
+}
+
+static bool __enable_hangcheck(int dir, bool state)
+{
+	return igt_sysfs_set(dir, "enable_hangcheck", state ? "1" : "0");
+}
+
+static void enable_hangcheck(int i915)
+{
+	int dir;
+
+	dir = igt_sysfs_open_parameters(i915);
+	if (dir < 0) /* no parameters, must be default! */
+		return;
+
+	/* If i915.hangcheck is removed, assume the default is good */
+	__enable_hangcheck(dir, true);
+	close(dir);
+}
+
+static void test_idempotent(int i915)
+{
+	struct drm_i915_gem_context_param p = {
+		.param = I915_CONTEXT_PARAM_PERSISTENCE,
+	};
+	int expected;
+
+	/*
+	 * Simple test to verify that we are able to read back the same boolean
+	 * value as we set.
+	 *
+	 * Each time we invert the current value so that at the end of the test,
+	 * if successful, we leave the context in the original state.
+	 */
+
+	gem_context_get_param(i915, &p);
+	expected = !!p.value;
+
+	expected = !expected;
+	p.value = expected;
+	gem_context_set_param(i915, &p);
+	gem_context_get_param(i915, &p);
+	igt_assert_eq(p.value, expected);
+
+	expected = !expected; /* and restores */
+	p.value = expected;
+	gem_context_set_param(i915, &p);
+	gem_context_get_param(i915, &p);
+	igt_assert_eq(p.value, expected);
+}
+
+static void test_persistence(int i915)
+{
+	igt_spin_t *spin;
+	int64_t timeout;
+	uint32_t ctx;
+
+	/*
+	 * Default behaviour are contexts remain alive until their last active
+	 * request is retired -- no early termination.
+	 */
+
+	ctx = gem_context_create(i915);
+	gem_context_set_persistence(i915, ctx, true);
+
+	spin = igt_spin_new(i915, ctx, .flags = IGT_SPIN_FENCE_OUT);
+	gem_context_destroy(i915, ctx);
+
+	timeout = NSEC_PER_SEC / 5;
+	igt_assert_eq(gem_wait(i915, spin->handle, &timeout), -ETIME);
+
+	igt_spin_end(spin);
+
+	timeout = NSEC_PER_SEC / 5;
+	igt_assert_eq(gem_wait(i915, spin->handle, &timeout), 0);
+	igt_assert_eq(sync_fence_status(spin->out_fence), 1);
+
+	igt_spin_free(i915, spin);
+	gem_quiescent_gpu(i915);
+}
+
+static void test_nonpersistent_cleanup(int i915)
+{
+	int64_t timeout = NSEC_PER_SEC / 5;
+	igt_spin_t *spin;
+	uint32_t ctx;
+
+	/*
+	 * A nonpersistent context is terminated immediately upon closure,
+	 * any inflight request is cancelled.
+	 */
+
+	ctx = gem_context_create(i915);
+	gem_context_set_persistence(i915, ctx, false);
+
+	spin = igt_spin_new(i915, ctx, .flags = IGT_SPIN_FENCE_OUT);
+	gem_context_destroy(i915, ctx);
+
+	igt_assert_eq(gem_wait(i915, spin->handle, &timeout), 0);
+	igt_assert_eq(sync_fence_status(spin->out_fence), -EIO);
+
+	igt_spin_free(i915, spin);
+	gem_quiescent_gpu(i915);
+}
+
+static void test_nonpersistent_mixed(int i915)
+{
+	int fence[3];
+
+	/*
+	 * Only a nonpersistent context is terminated immediately upon
+	 * closure, any inflight request is cancelled. If there is also
+	 * an active persistent context closed, it should be unafffected.
+	 */
+
+	for (int i = 0; i < ARRAY_SIZE(fence); i++) {
+		igt_spin_t *spin;
+		uint32_t ctx;
+
+		ctx = gem_context_create(i915);
+		gem_context_set_persistence(i915, ctx, i & 1);
+
+		spin = igt_spin_new(i915, ctx, .flags = IGT_SPIN_FENCE_OUT);
+		gem_context_destroy(i915, ctx);
+
+		fence[i] = spin->out_fence;
+	}
+
+	/* Outer pair of contexts were non-persistent and killed */
+	igt_assert_eq(sync_fence_wait(fence[0], MSEC_PER_SEC / 5), 0);
+	igt_assert_eq(sync_fence_status(fence[0]), -EIO);
+
+	igt_assert_eq(sync_fence_wait(fence[2], MSEC_PER_SEC / 5), 0);
+	igt_assert_eq(sync_fence_status(fence[2]), -EIO);
+
+	/* But the middle context is still running */
+	igt_assert_eq(sync_fence_wait(fence[1], 0), -ETIME);
+
+	gem_quiescent_gpu(i915);
+}
+
+static void test_nonpersistent_hostile(int i915)
+{
+	int64_t timeout = NSEC_PER_SEC / 2;
+	igt_spin_t *spin;
+	uint32_t ctx;
+
+	/*
+	 * If we cannot cleanly cancel the non-persistent context on closure,
+	 * e.g. preemption fails, we are forced to reset the GPU to terminate
+	 * the requests and cleanup the context.
+	 */
+
+	ctx = gem_context_create(i915);
+	gem_context_set_persistence(i915, ctx, false);
+
+	spin = igt_spin_new(i915, ctx, .flags = IGT_SPIN_NO_PREEMPTION);
+	gem_context_destroy(i915, ctx);
+
+	igt_assert_eq(gem_wait(i915, spin->handle, &timeout), 0);
+
+	igt_spin_free(i915, spin);
+	gem_quiescent_gpu(i915);
+}
+
+static void test_nonpersistent_hostile_preempt(int i915)
+{
+	int64_t timeout = NSEC_PER_SEC / 2;
+	igt_spin_t *spin[2];
+	uint32_t ctx;
+
+	/*
+	 * Double plus ungood.
+	 *
+	 * Here we would not be able to cancel the hostile non-persistent
+	 * context and we cannot preempt-to-idle as it is already waiting
+	 * on preemption for itself. Let's hope the kernel can save the
+	 * day with a reset.
+	 */
+
+	igt_require(gem_scheduler_has_preemption(i915));
+
+	ctx = gem_context_create(i915);
+	gem_context_set_persistence(i915, ctx, true);
+	gem_context_set_priority(i915, ctx, 0);
+	spin[0] = igt_spin_new(i915, ctx,
+			       .flags = (IGT_SPIN_NO_PREEMPTION |
+					 IGT_SPIN_POLL_RUN));
+	gem_context_destroy(i915, ctx);
+
+	igt_spin_busywait_until_started(spin[0]);
+
+	ctx = gem_context_create(i915);
+	gem_context_set_persistence(i915, ctx, false);
+	gem_context_set_priority(i915, ctx, 1); /* higher priority than 0 */
+	spin[1] = igt_spin_new(i915, ctx, .flags = IGT_SPIN_NO_PREEMPTION);
+	gem_context_destroy(i915, ctx);
+
+	igt_assert_eq(gem_wait(i915, spin[1]->handle, &timeout), 0);
+
+	igt_spin_free(i915, spin[1]);
+	igt_spin_free(i915, spin[0]);
+	gem_quiescent_gpu(i915);
+}
+
+static void test_nohangcheck_hostile(int i915)
+{
+	int64_t timeout = NSEC_PER_SEC / 2;
+	igt_spin_t *spin;
+	uint32_t ctx;
+	int dir;
+
+	/*
+	 * Even if the user disables hangcheck during their context,
+	 * we forcibly terminate that context.
+	 */
+
+	dir = igt_sysfs_open_parameters(i915);
+	igt_require(dir != -1);
+
+	ctx = gem_context_create(i915);
+
+	igt_require(__enable_hangcheck(dir, false));
+
+	spin = igt_spin_new(i915, ctx, .flags = IGT_SPIN_NO_PREEMPTION);
+	gem_context_destroy(i915, ctx);
+
+	igt_assert_eq(gem_wait(i915, spin->handle, &timeout), 0);
+
+	igt_require(__enable_hangcheck(dir, true));
+
+	igt_spin_free(i915, spin);
+	gem_quiescent_gpu(i915);
+	close(dir);
+}
+
+static void test_nonpersistent_file(int i915)
+{
+	int debugfs = i915;
+	igt_spin_t *spin;
+	uint32_t ctx;
+
+	/*
+	 * A context may live beyond its initial struct file, except if it
+	 * has been made nonpersistent, in which case it must be terminated.
+	 */
+
+	i915 = gem_reopen_driver(i915);
+	gem_quiescent_gpu(i915);
+
+	ctx = gem_context_create(i915);
+	gem_context_set_persistence(i915, ctx, false);
+
+	spin = igt_spin_new(i915, ctx, .flags = IGT_SPIN_FENCE_OUT);
+
+	close(i915);
+	rcu_barrier(debugfs); /* force the delayed fput() */
+
+	igt_assert_eq(sync_fence_wait(spin->out_fence, MSEC_PER_SEC / 5), 0);
+	igt_assert_eq(sync_fence_status(spin->out_fence), -EIO);
+
+	spin->handle = 0;
+	igt_spin_free(-1, spin);
+}
+
+static void sendfd(int socket, int fd)
+{
+	char buf[CMSG_SPACE(sizeof(fd))];
+	struct iovec io = { .iov_base = (char *)"ABC", .iov_len = 3 };
+	struct msghdr msg = {
+		.msg_iov = &io,
+		.msg_iovlen = 1,
+		.msg_control = buf,
+		.msg_controllen = CMSG_LEN(sizeof(fd)),
+	};
+	struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
+
+	cmsg->cmsg_level = SOL_SOCKET;
+	cmsg->cmsg_type = SCM_RIGHTS;
+	cmsg->cmsg_len = msg.msg_controllen;
+	*(int *)CMSG_DATA(cmsg) = fd;
+
+	igt_assert(sendmsg(socket, &msg, 0) != -1);
+}
+
+static int recvfd(int socket)
+{
+	char m_buffer[256], c_buffer[256];
+	struct iovec io = {
+		.iov_base = m_buffer,
+		.iov_len = sizeof(m_buffer),
+	};
+	struct msghdr msg = {
+		.msg_iov = &io,
+		.msg_iovlen = 1,
+		.msg_control = c_buffer,
+		.msg_controllen = sizeof(c_buffer),
+	};
+
+	igt_assert(recvmsg(socket, &msg, 0) != -1);
+	return *(int *)CMSG_DATA(CMSG_FIRSTHDR(&msg));
+}
+
+static void test_nonpersistent_process(int i915)
+{
+	int fence[2], sv[2];
+
+	/*
+	 * If a process dies early, any nonpersistent contexts it had
+	 * open must be terminated too. But any persistent contexts,
+	 * should survive until their requests are complete.
+	 */
+
+	igt_require(socketpair(AF_UNIX, SOCK_DGRAM, 0, sv) == 0);
+
+	igt_fork(child, 1) {
+		i915 = gem_reopen_driver(i915);
+		gem_quiescent_gpu(i915);
+
+		for (int persists = 0; persists <= 1; persists++) {
+			igt_spin_t *spin;
+			uint32_t ctx;
+
+			ctx = gem_context_create(i915);
+			gem_context_set_persistence(i915, ctx, persists);
+
+			spin = igt_spin_new(i915, ctx,
+					    .flags = IGT_SPIN_FENCE_OUT);
+
+			sendfd(sv[0], spin->out_fence);
+
+			igt_list_del(&spin->link); /* prevent autocleanup */
+		}
+	}
+	close(sv[0]);
+	igt_waitchildren();
+
+	fence[0] = recvfd(sv[1]);
+	fence[1] = recvfd(sv[1]);
+	close(sv[1]);
+
+	/* First fence is non-persistent, so should be reset */
+	igt_assert_eq(sync_fence_wait(fence[0], MSEC_PER_SEC / 5), 0);
+	igt_assert_eq(sync_fence_status(fence[0]), -EIO);
+	close(fence[0]);
+
+	/* Second fence is persistent, so should be still spinning */
+	igt_assert_eq(sync_fence_wait(fence[1], 0), -ETIME);
+	close(fence[1]);
+
+	/* We have to manually clean up the orphaned spinner */
+	igt_drop_caches_set(i915, DROP_RESET_ACTIVE);
+
+	gem_quiescent_gpu(i915);
+}
+
+static void sigign(int sig)
+{
+}
+
+static void test_mixed_process(int i915)
+{
+	struct {
+		int sv[2];
+	} p[2];
+
+	/*
+	 * If one process dies early and triggers its nonpersistent
+	 * context are cleaned up, but it should not affect a second process.
+	 */
+
+	gem_quiescent_gpu(i915);
+	for (int i = 0; i < ARRAY_SIZE(p); i++) {
+		igt_require(socketpair(AF_UNIX, SOCK_DGRAM, 0, p[i].sv) == 0);
+
+		igt_fork(child, 1) {
+			igt_spin_t *spin;
+			int pid;
+
+			i915 = gem_reopen_driver(i915);
+			gem_context_set_persistence(i915, 0, i);
+
+			spin = igt_spin_new(i915, .flags = IGT_SPIN_FENCE_OUT);
+			/* prevent autocleanup */
+			igt_list_del(&spin->link);
+
+			sendfd(p[i].sv[0], spin->out_fence);
+
+			/* Wait until we are told to die */
+			pid = getpid();
+			write(p[i].sv[0], &pid, sizeof(pid));
+			signal(SIGINT, sigign);
+			pause();
+		}
+	}
+
+	for (int i = 0; i < ARRAY_SIZE(p); i++) {
+		int fence, pid;
+
+		/* The process is not dead yet, so the context can spin. */
+		fence = recvfd(p[i].sv[1]);
+		igt_assert_eq(sync_fence_wait(fence, 0), -ETIME);
+
+		/* Kill *this* process */
+		read(p[i].sv[1], &pid, sizeof(pid));
+		igt_assert(kill(pid, SIGINT) == 0);
+
+		/*
+		 * A little bit of slack required for the signal to terminate
+		 * the process and for the system to cleanup the fd.
+		 */
+		sched_yield();
+		close(p[i].sv[0]);
+		close(p[i].sv[1]);
+		rcu_barrier(i915);
+
+		if (i == 0) {
+			/* First process is non-persistent, so should be reset */
+			igt_assert_eq(sync_fence_wait(fence,
+						      MSEC_PER_SEC / 5), 0);
+			igt_assert_eq(sync_fence_status(fence), -EIO);
+		} else {
+			/* Second fence is persistent, so still spinning */
+			igt_assert_eq(sync_fence_wait(fence, 0), -ETIME);
+		}
+		close(fence);
+	}
+	igt_waitchildren();
+
+	/* We have to manually clean up the orphaned spinner */
+	igt_drop_caches_set(i915, DROP_RESET_ACTIVE);
+	gem_quiescent_gpu(i915);
+}
+
+igt_main
+{
+	int i915;
+
+	igt_fixture {
+		i915 = drm_open_driver(DRIVER_INTEL);
+		igt_require_gem(i915);
+
+		igt_require(has_persistence(i915));
+		enable_hangcheck(i915);
+	}
+
+	igt_subtest_group {
+		igt_subtest("idempotent")
+			test_idempotent(i915);
+
+		igt_subtest("persistence")
+			test_persistence(i915);
+
+		igt_subtest("cleanup")
+			test_nonpersistent_cleanup(i915);
+
+		igt_subtest("mixed")
+			test_nonpersistent_mixed(i915);
+
+		igt_subtest("hostile")
+			test_nonpersistent_hostile(i915);
+
+		igt_subtest("hostile-preempt")
+			test_nonpersistent_hostile_preempt(i915);
+
+		igt_subtest("hangcheck")
+			test_nohangcheck_hostile(i915);
+
+		igt_subtest("file")
+			test_nonpersistent_file(i915);
+
+		igt_subtest("process")
+			test_nonpersistent_process(i915);
+
+		igt_subtest("mixed-processes")
+			test_mixed_process(i915);
+	}
+
+	igt_fixture {
+		close(i915);
+	}
+}
diff --git a/tests/meson.build b/tests/meson.build
index 7e3f9e0a4..3f3eee277 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -121,6 +121,7 @@ i915_progs = [
 	'gem_ctx_exec',
 	'gem_ctx_isolation',
 	'gem_ctx_param',
+	'gem_ctx_persistence',
 	'gem_ctx_shared',
 	'gem_ctx_switch',
 	'gem_ctx_thrash',
-- 
2.24.0.rc0

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

^ permalink raw reply related	[flat|nested] 20+ messages in thread
* [PATCH i-g-t 4/9] i915: Start putting the mmio_base to wider use
@ 2019-10-24 10:54   ` Chris Wilson
  0 siblings, 0 replies; 20+ messages in thread
From: Chris Wilson @ 2019-10-24 10:54 UTC (permalink / raw)
  To: intel-gfx

Several tests depend upon the implicit engine->mmio_base but have no
means of determining the physical layout. Since the kernel has started
providing this information, start putting it to use.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 lib/i915/gem_engine_topology.c | 84 ++++++++++++++++++++++++++++++++++
 lib/i915/gem_engine_topology.h |  5 ++
 tests/i915/gem_ctx_shared.c    | 38 +++++----------
 tests/i915/gem_exec_latency.c  | 17 ++++---
 4 files changed, 111 insertions(+), 33 deletions(-)

diff --git a/lib/i915/gem_engine_topology.c b/lib/i915/gem_engine_topology.c
index 790d455ff..bd200a4b9 100644
--- a/lib/i915/gem_engine_topology.c
+++ b/lib/i915/gem_engine_topology.c
@@ -21,7 +21,12 @@
  * IN THE SOFTWARE.
  */
 
+#include <fcntl.h>
+#include <unistd.h>
+
 #include "drmtest.h"
+#include "igt_sysfs.h"
+#include "intel_chipset.h"
 #include "ioctl_wrappers.h"
 
 #include "i915/gem_engine_topology.h"
@@ -337,3 +342,82 @@ bool gem_engine_is_equal(const struct intel_execution_engine2 *e1,
 {
 	return e1->class == e2->class && e1->instance == e2->instance;
 }
+
+static int descend(int dir, const char *path)
+{
+	int fd;
+
+	fd = openat(dir, path, O_RDONLY);
+	close(dir);
+
+	return fd;
+}
+
+int gem_engine_property_scanf(int i915, const char *engine, const char *attr,
+			      const char *fmt, ...)
+{
+	FILE *file;
+	va_list ap;
+	int ret;
+	int fd;
+
+	fd = igt_sysfs_open(i915);
+	if (fd < 0)
+		return fd;
+
+	fd = descend(fd, "engine");
+	if (fd < 0)
+		return fd;
+
+	fd = descend(fd, engine);
+	if (fd < 0)
+		return fd;
+
+	fd = descend(fd, attr);
+	if (fd < 0)
+		return fd;
+
+	file = fdopen(fd, "r");
+	if (!file) {
+		close(fd);
+		return -1;
+	}
+
+	va_start(ap, fmt);
+	ret = vfscanf(file, fmt, ap);
+	va_end(ap);
+
+	fclose(file);
+	return ret;
+}
+
+uint32_t gem_engine_mmio_base(int i915, const char *engine)
+{
+	unsigned int mmio = 0;
+
+	if (gem_engine_property_scanf(i915, engine, "mmio_base",
+				      "%x", &mmio) < 0) {
+		int gen = intel_gen(intel_get_drm_devid(i915));
+
+		/* The layout of xcs1+ is unreliable -- hence the property! */
+		if (!strcmp(engine, "rcs0")) {
+			mmio = 0x2000;
+		} else if (!strcmp(engine, "bcs0")) {
+			mmio = 0x22000;
+		} else if (!strcmp(engine, "vcs0")) {
+			if (gen < 6)
+				mmio = 0x4000;
+			else if (gen < 11)
+				mmio = 0x12000;
+			else
+				mmio = 0x1c0000;
+		} else if (!strcmp(engine, "vecs0")) {
+			if (gen < 11)
+				mmio = 0x1a000;
+			else
+				mmio = 0x1c8000;
+		}
+	}
+
+	return mmio;
+}
diff --git a/lib/i915/gem_engine_topology.h b/lib/i915/gem_engine_topology.h
index d98773e06..e728ebd93 100644
--- a/lib/i915/gem_engine_topology.h
+++ b/lib/i915/gem_engine_topology.h
@@ -74,4 +74,9 @@ struct intel_execution_engine2 gem_eb_flags_to_engine(unsigned int flags);
 	     ((e__) = intel_get_current_physical_engine(&i__)); \
 	     intel_next_engine(&i__))
 
+__attribute__((format(scanf, 4, 5)))
+int gem_engine_property_scanf(int i915, const char *engine, const char *attr,
+			      const char *fmt, ...);
+uint32_t gem_engine_mmio_base(int i915, const char *engine);
+
 #endif /* GEM_ENGINE_TOPOLOGY_H */
diff --git a/tests/i915/gem_ctx_shared.c b/tests/i915/gem_ctx_shared.c
index f78524822..594468738 100644
--- a/tests/i915/gem_ctx_shared.c
+++ b/tests/i915/gem_ctx_shared.c
@@ -38,6 +38,7 @@
 
 #include <drm.h>
 
+#include "i915/gem_engine_topology.h"
 #include "igt_rand.h"
 #include "igt_vgem.h"
 #include "sync_file.h"
@@ -558,6 +559,14 @@ static uint32_t store_timestamp(int i915,
 	return obj.handle;
 }
 
+static uint32_t ring_base(int i915, unsigned ring)
+{
+	if (ring == I915_EXEC_DEFAULT)
+		ring = I915_EXEC_RENDER; /* XXX */
+
+	return gem_engine_mmio_base(i915, gem_eb_flags_to_engine(ring).name);
+}
+
 static void independent(int i915, unsigned ring, unsigned flags)
 {
 	const int TIMESTAMP = 1023;
@@ -565,33 +574,8 @@ static void independent(int i915, unsigned ring, unsigned flags)
 	igt_spin_t *spin[MAX_ELSP_QLEN];
 	unsigned int mmio_base;
 
-	/* XXX i915_query()! */
-	switch (ring) {
-	case I915_EXEC_DEFAULT:
-	case I915_EXEC_RENDER:
-		mmio_base = 0x2000;
-		break;
-#if 0
-	case I915_EXEC_BSD:
-		mmio_base = 0x12000;
-		break;
-#endif
-	case I915_EXEC_BLT:
-		mmio_base = 0x22000;
-		break;
-
-#define GEN11_VECS0_BASE 0x1c8000
-#define GEN11_VECS1_BASE 0x1d8000
-	case I915_EXEC_VEBOX:
-		if (intel_gen(intel_get_drm_devid(i915)) >= 11)
-			mmio_base = GEN11_VECS0_BASE;
-		else
-			mmio_base = 0x1a000;
-		break;
-
-	default:
-		igt_skip("mmio base not known\n");
-	}
+	mmio_base = ring_base(i915, ring);
+	igt_require_f(mmio_base, "mmio base not known\n");
 
 	for (int n = 0; n < ARRAY_SIZE(spin); n++) {
 		const struct igt_spin_factory opts = {
diff --git a/tests/i915/gem_exec_latency.c b/tests/i915/gem_exec_latency.c
index 9ddb348c0..ea1eee0aa 100644
--- a/tests/i915/gem_exec_latency.c
+++ b/tests/i915/gem_exec_latency.c
@@ -109,7 +109,7 @@ poll_ring(int fd, unsigned ring, const char *name)
 	igt_spin_free(fd, spin[0]);
 }
 
-#define RCS_TIMESTAMP (0x2000 + 0x358)
+#define TIMESTAMP (0x358)
 static void latency_on_ring(int fd,
 			    unsigned ring, const char *name,
 			    unsigned flags)
@@ -119,6 +119,7 @@ static void latency_on_ring(int fd,
 	struct drm_i915_gem_exec_object2 obj[3];
 	struct drm_i915_gem_relocation_entry reloc;
 	struct drm_i915_gem_execbuffer2 execbuf;
+	const uint32_t mmio_base = gem_engine_mmio_base(fd, name);
 	igt_spin_t *spin = NULL;
 	IGT_CORK_HANDLE(c);
 	volatile uint32_t *reg;
@@ -128,7 +129,8 @@ static void latency_on_ring(int fd,
 	double gpu_latency;
 	int i, j;
 
-	reg = (volatile uint32_t *)((volatile char *)igt_global_mmio + RCS_TIMESTAMP);
+	igt_require(mmio_base);
+	reg = (volatile uint32_t *)((volatile char *)igt_global_mmio + mmio_base + TIMESTAMP);
 
 	memset(&execbuf, 0, sizeof(execbuf));
 	execbuf.buffers_ptr = to_user_pointer(&obj[1]);
@@ -176,7 +178,7 @@ static void latency_on_ring(int fd,
 		map[i++] = 0x24 << 23 | 1;
 		if (has_64bit_reloc)
 			map[i-1]++;
-		map[i++] = RCS_TIMESTAMP; /* ring local! */
+		map[i++] = mmio_base + TIMESTAMP;
 		map[i++] = offset;
 		if (has_64bit_reloc)
 			map[i++] = offset >> 32;
@@ -266,12 +268,15 @@ static void latency_from_ring(int fd,
 	struct drm_i915_gem_exec_object2 obj[3];
 	struct drm_i915_gem_relocation_entry reloc;
 	struct drm_i915_gem_execbuffer2 execbuf;
+	const uint32_t mmio_base = gem_engine_mmio_base(fd, name);
 	const unsigned int repeats = ring_size / 2;
 	unsigned int other;
 	uint32_t *map, *results;
 	uint32_t ctx[2] = {};
 	int i, j;
 
+	igt_require(mmio_base);
+
 	if (flags & PREEMPT) {
 		ctx[0] = gem_context_create(fd);
 		gem_context_set_priority(fd, ctx[0], -1023);
@@ -352,7 +357,7 @@ static void latency_from_ring(int fd,
 			map[i++] = 0x24 << 23 | 1;
 			if (has_64bit_reloc)
 				map[i-1]++;
-			map[i++] = RCS_TIMESTAMP; /* ring local! */
+			map[i++] = mmio_base + TIMESTAMP;
 			map[i++] = offset;
 			if (has_64bit_reloc)
 				map[i++] = offset >> 32;
@@ -377,7 +382,7 @@ static void latency_from_ring(int fd,
 			map[i++] = 0x24 << 23 | 1;
 			if (has_64bit_reloc)
 				map[i-1]++;
-			map[i++] = RCS_TIMESTAMP; /* ring local! */
+			map[i++] = mmio_base + TIMESTAMP;
 			map[i++] = offset;
 			if (has_64bit_reloc)
 				map[i++] = offset >> 32;
@@ -670,7 +675,7 @@ igt_main
 			ring_size = 1024;
 
 		intel_register_access_init(&mmio_data, intel_get_pci_device(), false, device);
-		rcs_clock = clockrate(device, RCS_TIMESTAMP);
+		rcs_clock = clockrate(device, 0x2000 + TIMESTAMP);
 		igt_info("RCS timestamp clock: %.0fKHz, %.1fns\n",
 			 rcs_clock / 1e3, 1e9 / rcs_clock);
 		rcs_clock = 1e9 / rcs_clock;
-- 
2.24.0.rc0

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

^ permalink raw reply related	[flat|nested] 20+ messages in thread
* [Intel-gfx] [PATCH i-g-t 4/9] i915: Start putting the mmio_base to wider use
@ 2019-10-24 10:54   ` Chris Wilson
  0 siblings, 0 replies; 20+ messages in thread
From: Chris Wilson @ 2019-10-24 10:54 UTC (permalink / raw)
  To: intel-gfx

Several tests depend upon the implicit engine->mmio_base but have no
means of determining the physical layout. Since the kernel has started
providing this information, start putting it to use.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 lib/i915/gem_engine_topology.c | 84 ++++++++++++++++++++++++++++++++++
 lib/i915/gem_engine_topology.h |  5 ++
 tests/i915/gem_ctx_shared.c    | 38 +++++----------
 tests/i915/gem_exec_latency.c  | 17 ++++---
 4 files changed, 111 insertions(+), 33 deletions(-)

diff --git a/lib/i915/gem_engine_topology.c b/lib/i915/gem_engine_topology.c
index 790d455ff..bd200a4b9 100644
--- a/lib/i915/gem_engine_topology.c
+++ b/lib/i915/gem_engine_topology.c
@@ -21,7 +21,12 @@
  * IN THE SOFTWARE.
  */
 
+#include <fcntl.h>
+#include <unistd.h>
+
 #include "drmtest.h"
+#include "igt_sysfs.h"
+#include "intel_chipset.h"
 #include "ioctl_wrappers.h"
 
 #include "i915/gem_engine_topology.h"
@@ -337,3 +342,82 @@ bool gem_engine_is_equal(const struct intel_execution_engine2 *e1,
 {
 	return e1->class == e2->class && e1->instance == e2->instance;
 }
+
+static int descend(int dir, const char *path)
+{
+	int fd;
+
+	fd = openat(dir, path, O_RDONLY);
+	close(dir);
+
+	return fd;
+}
+
+int gem_engine_property_scanf(int i915, const char *engine, const char *attr,
+			      const char *fmt, ...)
+{
+	FILE *file;
+	va_list ap;
+	int ret;
+	int fd;
+
+	fd = igt_sysfs_open(i915);
+	if (fd < 0)
+		return fd;
+
+	fd = descend(fd, "engine");
+	if (fd < 0)
+		return fd;
+
+	fd = descend(fd, engine);
+	if (fd < 0)
+		return fd;
+
+	fd = descend(fd, attr);
+	if (fd < 0)
+		return fd;
+
+	file = fdopen(fd, "r");
+	if (!file) {
+		close(fd);
+		return -1;
+	}
+
+	va_start(ap, fmt);
+	ret = vfscanf(file, fmt, ap);
+	va_end(ap);
+
+	fclose(file);
+	return ret;
+}
+
+uint32_t gem_engine_mmio_base(int i915, const char *engine)
+{
+	unsigned int mmio = 0;
+
+	if (gem_engine_property_scanf(i915, engine, "mmio_base",
+				      "%x", &mmio) < 0) {
+		int gen = intel_gen(intel_get_drm_devid(i915));
+
+		/* The layout of xcs1+ is unreliable -- hence the property! */
+		if (!strcmp(engine, "rcs0")) {
+			mmio = 0x2000;
+		} else if (!strcmp(engine, "bcs0")) {
+			mmio = 0x22000;
+		} else if (!strcmp(engine, "vcs0")) {
+			if (gen < 6)
+				mmio = 0x4000;
+			else if (gen < 11)
+				mmio = 0x12000;
+			else
+				mmio = 0x1c0000;
+		} else if (!strcmp(engine, "vecs0")) {
+			if (gen < 11)
+				mmio = 0x1a000;
+			else
+				mmio = 0x1c8000;
+		}
+	}
+
+	return mmio;
+}
diff --git a/lib/i915/gem_engine_topology.h b/lib/i915/gem_engine_topology.h
index d98773e06..e728ebd93 100644
--- a/lib/i915/gem_engine_topology.h
+++ b/lib/i915/gem_engine_topology.h
@@ -74,4 +74,9 @@ struct intel_execution_engine2 gem_eb_flags_to_engine(unsigned int flags);
 	     ((e__) = intel_get_current_physical_engine(&i__)); \
 	     intel_next_engine(&i__))
 
+__attribute__((format(scanf, 4, 5)))
+int gem_engine_property_scanf(int i915, const char *engine, const char *attr,
+			      const char *fmt, ...);
+uint32_t gem_engine_mmio_base(int i915, const char *engine);
+
 #endif /* GEM_ENGINE_TOPOLOGY_H */
diff --git a/tests/i915/gem_ctx_shared.c b/tests/i915/gem_ctx_shared.c
index f78524822..594468738 100644
--- a/tests/i915/gem_ctx_shared.c
+++ b/tests/i915/gem_ctx_shared.c
@@ -38,6 +38,7 @@
 
 #include <drm.h>
 
+#include "i915/gem_engine_topology.h"
 #include "igt_rand.h"
 #include "igt_vgem.h"
 #include "sync_file.h"
@@ -558,6 +559,14 @@ static uint32_t store_timestamp(int i915,
 	return obj.handle;
 }
 
+static uint32_t ring_base(int i915, unsigned ring)
+{
+	if (ring == I915_EXEC_DEFAULT)
+		ring = I915_EXEC_RENDER; /* XXX */
+
+	return gem_engine_mmio_base(i915, gem_eb_flags_to_engine(ring).name);
+}
+
 static void independent(int i915, unsigned ring, unsigned flags)
 {
 	const int TIMESTAMP = 1023;
@@ -565,33 +574,8 @@ static void independent(int i915, unsigned ring, unsigned flags)
 	igt_spin_t *spin[MAX_ELSP_QLEN];
 	unsigned int mmio_base;
 
-	/* XXX i915_query()! */
-	switch (ring) {
-	case I915_EXEC_DEFAULT:
-	case I915_EXEC_RENDER:
-		mmio_base = 0x2000;
-		break;
-#if 0
-	case I915_EXEC_BSD:
-		mmio_base = 0x12000;
-		break;
-#endif
-	case I915_EXEC_BLT:
-		mmio_base = 0x22000;
-		break;
-
-#define GEN11_VECS0_BASE 0x1c8000
-#define GEN11_VECS1_BASE 0x1d8000
-	case I915_EXEC_VEBOX:
-		if (intel_gen(intel_get_drm_devid(i915)) >= 11)
-			mmio_base = GEN11_VECS0_BASE;
-		else
-			mmio_base = 0x1a000;
-		break;
-
-	default:
-		igt_skip("mmio base not known\n");
-	}
+	mmio_base = ring_base(i915, ring);
+	igt_require_f(mmio_base, "mmio base not known\n");
 
 	for (int n = 0; n < ARRAY_SIZE(spin); n++) {
 		const struct igt_spin_factory opts = {
diff --git a/tests/i915/gem_exec_latency.c b/tests/i915/gem_exec_latency.c
index 9ddb348c0..ea1eee0aa 100644
--- a/tests/i915/gem_exec_latency.c
+++ b/tests/i915/gem_exec_latency.c
@@ -109,7 +109,7 @@ poll_ring(int fd, unsigned ring, const char *name)
 	igt_spin_free(fd, spin[0]);
 }
 
-#define RCS_TIMESTAMP (0x2000 + 0x358)
+#define TIMESTAMP (0x358)
 static void latency_on_ring(int fd,
 			    unsigned ring, const char *name,
 			    unsigned flags)
@@ -119,6 +119,7 @@ static void latency_on_ring(int fd,
 	struct drm_i915_gem_exec_object2 obj[3];
 	struct drm_i915_gem_relocation_entry reloc;
 	struct drm_i915_gem_execbuffer2 execbuf;
+	const uint32_t mmio_base = gem_engine_mmio_base(fd, name);
 	igt_spin_t *spin = NULL;
 	IGT_CORK_HANDLE(c);
 	volatile uint32_t *reg;
@@ -128,7 +129,8 @@ static void latency_on_ring(int fd,
 	double gpu_latency;
 	int i, j;
 
-	reg = (volatile uint32_t *)((volatile char *)igt_global_mmio + RCS_TIMESTAMP);
+	igt_require(mmio_base);
+	reg = (volatile uint32_t *)((volatile char *)igt_global_mmio + mmio_base + TIMESTAMP);
 
 	memset(&execbuf, 0, sizeof(execbuf));
 	execbuf.buffers_ptr = to_user_pointer(&obj[1]);
@@ -176,7 +178,7 @@ static void latency_on_ring(int fd,
 		map[i++] = 0x24 << 23 | 1;
 		if (has_64bit_reloc)
 			map[i-1]++;
-		map[i++] = RCS_TIMESTAMP; /* ring local! */
+		map[i++] = mmio_base + TIMESTAMP;
 		map[i++] = offset;
 		if (has_64bit_reloc)
 			map[i++] = offset >> 32;
@@ -266,12 +268,15 @@ static void latency_from_ring(int fd,
 	struct drm_i915_gem_exec_object2 obj[3];
 	struct drm_i915_gem_relocation_entry reloc;
 	struct drm_i915_gem_execbuffer2 execbuf;
+	const uint32_t mmio_base = gem_engine_mmio_base(fd, name);
 	const unsigned int repeats = ring_size / 2;
 	unsigned int other;
 	uint32_t *map, *results;
 	uint32_t ctx[2] = {};
 	int i, j;
 
+	igt_require(mmio_base);
+
 	if (flags & PREEMPT) {
 		ctx[0] = gem_context_create(fd);
 		gem_context_set_priority(fd, ctx[0], -1023);
@@ -352,7 +357,7 @@ static void latency_from_ring(int fd,
 			map[i++] = 0x24 << 23 | 1;
 			if (has_64bit_reloc)
 				map[i-1]++;
-			map[i++] = RCS_TIMESTAMP; /* ring local! */
+			map[i++] = mmio_base + TIMESTAMP;
 			map[i++] = offset;
 			if (has_64bit_reloc)
 				map[i++] = offset >> 32;
@@ -377,7 +382,7 @@ static void latency_from_ring(int fd,
 			map[i++] = 0x24 << 23 | 1;
 			if (has_64bit_reloc)
 				map[i-1]++;
-			map[i++] = RCS_TIMESTAMP; /* ring local! */
+			map[i++] = mmio_base + TIMESTAMP;
 			map[i++] = offset;
 			if (has_64bit_reloc)
 				map[i++] = offset >> 32;
@@ -670,7 +675,7 @@ igt_main
 			ring_size = 1024;
 
 		intel_register_access_init(&mmio_data, intel_get_pci_device(), false, device);
-		rcs_clock = clockrate(device, RCS_TIMESTAMP);
+		rcs_clock = clockrate(device, 0x2000 + TIMESTAMP);
 		igt_info("RCS timestamp clock: %.0fKHz, %.1fns\n",
 			 rcs_clock / 1e3, 1e9 / rcs_clock);
 		rcs_clock = 1e9 / rcs_clock;
-- 
2.24.0.rc0

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^ permalink raw reply related	[flat|nested] 20+ messages in thread
* [PATCH i-g-t 5/9] i915/gem_ctx_isolation: Check engine relative registers
@ 2019-10-24 10:54   ` Chris Wilson
  0 siblings, 0 replies; 20+ messages in thread
From: Chris Wilson @ 2019-10-24 10:54 UTC (permalink / raw)
  To: intel-gfx

Some of the non-privileged registers are at the same offset on each
engine. We can improve our coverage for unknown HW layout by using the
reported engine->mmio_base for relative offsets.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 tests/i915/gem_ctx_isolation.c | 160 ++++++++++++++++++++-------------
 1 file changed, 99 insertions(+), 61 deletions(-)

diff --git a/tests/i915/gem_ctx_isolation.c b/tests/i915/gem_ctx_isolation.c
index 6aa27133c..5e82c31c2 100644
--- a/tests/i915/gem_ctx_isolation.c
+++ b/tests/i915/gem_ctx_isolation.c
@@ -70,6 +70,7 @@ static const struct named_register {
 	uint32_t ignore_bits;
 	uint32_t write_mask; /* some registers bits do not exist */
 	bool masked;
+	bool relative;
 } nonpriv_registers[] = {
 	{ "NOPID", NOCTX, RCS0, 0x2094 },
 	{ "MI_PREDICATE_RESULT_2", NOCTX, RCS0, 0x23bc },
@@ -150,67 +151,45 @@ static const struct named_register {
 	{ "HALF_SLICE_CHICKEN7", GEN_RANGE(11, 11), RCS0, 0xe194, .masked = true },
 	{ "SAMPLER_MODE", GEN_RANGE(11, 11), RCS0, 0xe18c, .masked = true },
 
-	{ "BCS_GPR", GEN9, BCS0, 0x22600, 32 },
 	{ "BCS_SWCTRL", GEN8, BCS0, 0x22200, .write_mask = 0x3, .masked = true },
 
 	{ "MFC_VDBOX1", NOCTX, VCS0, 0x12800, 64 },
 	{ "MFC_VDBOX2", NOCTX, VCS1, 0x1c800, 64 },
 
-	{ "VCS0_GPR", GEN_RANGE(9, 10), VCS0, 0x12600, 32 },
-	{ "VCS1_GPR", GEN_RANGE(9, 10), VCS1, 0x1c600, 32 },
-	{ "VECS_GPR", GEN_RANGE(9, 10), VECS0, 0x1a600, 32 },
-
-	{ "VCS0_GPR", GEN11, VCS0, 0x1c0600, 32 },
-	{ "VCS1_GPR", GEN11, VCS1, 0x1c4600, 32 },
-	{ "VCS2_GPR", GEN11, VCS2, 0x1d0600, 32 },
-	{ "VCS3_GPR", GEN11, VCS3, 0x1d4600, 32 },
-	{ "VECS_GPR", GEN11, VECS0, 0x1c8600, 32 },
+	{ "xCS_GPR", GEN9, ALL, 0x600, 32, .relative = true },
 
 	{}
 }, ignore_registers[] = {
 	{ "RCS timestamp", GEN6, ~0u, 0x2358 },
 	{ "BCS timestamp", GEN7, ~0u, 0x22358 },
 
-	{ "VCS0 timestamp", GEN_RANGE(7, 10), ~0u, 0x12358 },
-	{ "VCS1 timestamp", GEN_RANGE(7, 10), ~0u, 0x1c358 },
-	{ "VECS timestamp", GEN_RANGE(8, 10), ~0u, 0x1a358 },
-
-	{ "VCS0 timestamp", GEN11, ~0u, 0x1c0358 },
-	{ "VCS1 timestamp", GEN11, ~0u, 0x1c4358 },
-	{ "VCS2 timestamp", GEN11, ~0u, 0x1d0358 },
-	{ "VCS3 timestamp", GEN11, ~0u, 0x1d4358 },
-	{ "VECS timestamp", GEN11, ~0u, 0x1c8358 },
+	{ "xCS timestamp", GEN8, ALL, 0x358, .relative = true },
 
 	/* huc read only */
-	{ "BSD0 0x2000", GEN11, ~0u, 0x1c0000 + 0x2000 },
-	{ "BSD0 0x2000", GEN11, ~0u, 0x1c0000 + 0x2014 },
-	{ "BSD0 0x2000", GEN11, ~0u, 0x1c0000 + 0x23b0 },
-
-	{ "BSD1 0x2000", GEN11, ~0u, 0x1c4000 + 0x2000 },
-	{ "BSD1 0x2000", GEN11, ~0u, 0x1c4000 + 0x2014 },
-	{ "BSD1 0x2000", GEN11, ~0u, 0x1c4000 + 0x23b0 },
-
-	{ "BSD2 0x2000", GEN11, ~0u, 0x1d0000 + 0x2000 },
-	{ "BSD2 0x2000", GEN11, ~0u, 0x1d0000 + 0x2014 },
-	{ "BSD2 0x2000", GEN11, ~0u, 0x1d0000 + 0x23b0 },
-
-	{ "BSD3 0x2000", GEN11, ~0u, 0x1d4000 + 0x2000 },
-	{ "BSD3 0x2000", GEN11, ~0u, 0x1d4000 + 0x2014 },
-	{ "BSD3 0x2000", GEN11, ~0u, 0x1d4000 + 0x23b0 },
+	{ "BSD 0x2000", GEN11, ALL, 0x2000, .relative = true },
+	{ "BSD 0x2014", GEN11, ALL, 0x2014, .relative = true },
+	{ "BSD 0x23b0", GEN11, ALL, 0x23b0, .relative = true },
 
 	{}
 };
 
-static const char *register_name(uint32_t offset, char *buf, size_t len)
+static const char *
+register_name(uint32_t offset, uint32_t mmio_base, char *buf, size_t len)
 {
 	for (const struct named_register *r = nonpriv_registers; r->name; r++) {
 		unsigned int width = r->count ? 4*r->count : 4;
-		if (offset >= r->offset && offset < r->offset + width) {
+		uint32_t base;
+
+		base = r->offset;
+		if (r->relative)
+			base += mmio_base;
+
+		if (offset >= base && offset < base + width) {
 			if (r->count <= 1)
 				return r->name;
 
 			snprintf(buf, len, "%s[%d]",
-				 r->name, (offset - r->offset)/4);
+				 r->name, (offset - base) / 4);
 			return buf;
 		}
 	}
@@ -218,22 +197,35 @@ static const char *register_name(uint32_t offset, char *buf, size_t len)
 	return "unknown";
 }
 
-static const struct named_register *lookup_register(uint32_t offset)
+static const struct named_register *
+lookup_register(uint32_t offset, uint32_t mmio_base)
 {
 	for (const struct named_register *r = nonpriv_registers; r->name; r++) {
 		unsigned int width = r->count ? 4*r->count : 4;
-		if (offset >= r->offset && offset < r->offset + width)
+		uint32_t base;
+
+		base = r->offset;
+		if (r->relative)
+			base += mmio_base;
+
+		if (offset >= base && offset < base + width)
 			return r;
 	}
 
 	return NULL;
 }
 
-static bool ignore_register(uint32_t offset)
+static bool ignore_register(uint32_t offset, uint32_t mmio_base)
 {
 	for (const struct named_register *r = ignore_registers; r->name; r++) {
 		unsigned int width = r->count ? 4*r->count : 4;
-		if (offset >= r->offset && offset < r->offset + width)
+		uint32_t base;
+
+		base = r->offset;
+		if (r->relative)
+			base += mmio_base;
+
+		if (offset >= base && offset < base + width)
 			return true;
 	}
 
@@ -248,6 +240,7 @@ static void tmpl_regs(int fd,
 {
 	const unsigned int gen_bit = 1 << intel_gen(intel_get_drm_devid(fd));
 	const unsigned int engine_bit = ENGINE(e->class, e->instance);
+	const uint32_t mmio_base = gem_engine_mmio_base(fd, e->name);
 	unsigned int regs_size;
 	uint32_t *regs;
 
@@ -259,12 +252,20 @@ static void tmpl_regs(int fd,
 		       I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
 
 	for (const struct named_register *r = nonpriv_registers; r->name; r++) {
+		uint32_t offset;
+
 		if (!(r->engine_mask & engine_bit))
 			continue;
 		if (!(r->gen_mask & gen_bit))
 			continue;
-		for (unsigned count = r->count ?: 1, offset = r->offset;
-		     count--; offset += 4) {
+		if (r->relative && !mmio_base)
+			continue;
+
+		offset = r->offset;
+		if (r->relative)
+			offset += mmio_base;
+
+		for (unsigned count = r->count ?: 1; count--; offset += 4) {
 			uint32_t x = value;
 			if (r->write_mask)
 				x &= r->write_mask;
@@ -284,6 +285,7 @@ static uint32_t read_regs(int fd,
 	const unsigned int gen = intel_gen(intel_get_drm_devid(fd));
 	const unsigned int gen_bit = 1 << gen;
 	const unsigned int engine_bit = ENGINE(e->class, e->instance);
+	const uint32_t mmio_base = gem_engine_mmio_base(fd, e->name);
 	const bool r64b = gen >= 8;
 	struct drm_i915_gem_exec_object2 obj[2];
 	struct drm_i915_gem_relocation_entry *reloc;
@@ -311,13 +313,20 @@ static uint32_t read_regs(int fd,
 
 	n = 0;
 	for (const struct named_register *r = nonpriv_registers; r->name; r++) {
+		uint32_t offset;
+
 		if (!(r->engine_mask & engine_bit))
 			continue;
 		if (!(r->gen_mask & gen_bit))
 			continue;
+		if (r->relative && !mmio_base)
+			continue;
+
+		offset = r->offset;
+		if (r->relative)
+			offset += mmio_base;
 
-		for (unsigned count = r->count ?: 1, offset = r->offset;
-		     count--; offset += 4) {
+		for (unsigned count = r->count ?: 1; count--; offset += 4) {
 			*b++ = 0x24 << 23 | (1 + r64b); /* SRM */
 			*b++ = offset;
 			reloc[n].target_handle = obj[0].handle;
@@ -357,6 +366,7 @@ static void write_regs(int fd,
 {
 	const unsigned int gen_bit = 1 << intel_gen(intel_get_drm_devid(fd));
 	const unsigned int engine_bit = ENGINE(e->class, e->instance);
+	const uint32_t mmio_base = gem_engine_mmio_base(fd, e->name);
 	struct drm_i915_gem_exec_object2 obj;
 	struct drm_i915_gem_execbuffer2 execbuf;
 	unsigned int batch_size;
@@ -372,12 +382,20 @@ static void write_regs(int fd,
 	gem_set_domain(fd, obj.handle,
 		       I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
 	for (const struct named_register *r = nonpriv_registers; r->name; r++) {
+		uint32_t offset;
+
 		if (!(r->engine_mask & engine_bit))
 			continue;
 		if (!(r->gen_mask & gen_bit))
 			continue;
-		for (unsigned count = r->count ?: 1, offset = r->offset;
-		     count--; offset += 4) {
+		if (r->relative && !mmio_base)
+			continue;
+
+		offset = r->offset;
+		if (r->relative)
+			offset += mmio_base;
+
+		for (unsigned count = r->count ?: 1; count--; offset += 4) {
 			uint32_t x = value;
 			if (r->write_mask)
 				x &= r->write_mask;
@@ -410,6 +428,7 @@ static void restore_regs(int fd,
 	const unsigned int gen = intel_gen(intel_get_drm_devid(fd));
 	const unsigned int gen_bit = 1 << gen;
 	const unsigned int engine_bit = ENGINE(e->class, e->instance);
+	const uint32_t mmio_base = gem_engine_mmio_base(fd, e->name);
 	const bool r64b = gen >= 8;
 	struct drm_i915_gem_exec_object2 obj[2];
 	struct drm_i915_gem_execbuffer2 execbuf;
@@ -437,13 +456,20 @@ static void restore_regs(int fd,
 
 	n = 0;
 	for (const struct named_register *r = nonpriv_registers; r->name; r++) {
+		uint32_t offset;
+
 		if (!(r->engine_mask & engine_bit))
 			continue;
 		if (!(r->gen_mask & gen_bit))
 			continue;
+		if (r->relative && !mmio_base)
+			continue;
+
+		offset = r->offset;
+		if (r->relative)
+			offset += mmio_base;
 
-		for (unsigned count = r->count ?: 1, offset = r->offset;
-		     count--; offset += 4) {
+		for (unsigned count = r->count ?: 1; count--; offset += 4) {
 			*b++ = 0x29 << 23 | (1 + r64b); /* LRM */
 			*b++ = offset;
 			reloc[n].target_handle = obj[0].handle;
@@ -479,6 +505,7 @@ static void dump_regs(int fd,
 	const int gen = intel_gen(intel_get_drm_devid(fd));
 	const unsigned int gen_bit = 1 << gen;
 	const unsigned int engine_bit = ENGINE(e->class, e->instance);
+	const uint32_t mmio_base = gem_engine_mmio_base(fd, e->name);
 	unsigned int regs_size;
 	uint32_t *out;
 
@@ -489,26 +516,36 @@ static void dump_regs(int fd,
 	gem_set_domain(fd, regs, I915_GEM_DOMAIN_CPU, 0);
 
 	for (const struct named_register *r = nonpriv_registers; r->name; r++) {
+		uint32_t offset;
+
 		if (!(r->engine_mask & engine_bit))
 			continue;
 		if (!(r->gen_mask & gen_bit))
 			continue;
+		if (r->relative && !mmio_base)
+			continue;
+
+		offset = r->offset;
+		if (r->relative)
+			offset += mmio_base;
 
 		if (r->count <= 1) {
 			igt_debug("0x%04x (%s): 0x%08x\n",
-				  r->offset, r->name, out[r->offset/4]);
+				  offset, r->name, out[offset / 4]);
 		} else {
 			for (unsigned x = 0; x < r->count; x++)
 				igt_debug("0x%04x (%s[%d]): 0x%08x\n",
-					  r->offset+4*x, r->name, x,
-					  out[r->offset/4 + x]);
+					  offset + 4 * x, r->name, x,
+					  out[offset / 4 + x]);
 		}
 	}
 	munmap(out, regs_size);
 }
 
-static void compare_regs(int fd, uint32_t A, uint32_t B, const char *who)
+static void compare_regs(int fd, const struct intel_execution_engine2 *e,
+			 uint32_t A, uint32_t B, const char *who)
 {
+	const uint32_t mmio_base = gem_engine_mmio_base(fd, e->name);
 	unsigned int num_errors;
 	unsigned int regs_size;
 	uint32_t *a, *b;
@@ -532,11 +569,11 @@ static void compare_regs(int fd, uint32_t A, uint32_t B, const char *who)
 		if (a[n] == b[n])
 			continue;
 
-		if (ignore_register(offset))
+		if (ignore_register(offset, mmio_base))
 			continue;
 
 		mask = ~0u;
-		r = lookup_register(offset);
+		r = lookup_register(offset, mmio_base);
 		if (r && r->masked)
 			mask >>= 16;
 		if (r && r->ignore_bits)
@@ -547,7 +584,7 @@ static void compare_regs(int fd, uint32_t A, uint32_t B, const char *who)
 
 		igt_warn("Register 0x%04x (%s): A=%08x B=%08x\n",
 			 offset,
-			 register_name(offset, buf, sizeof(buf)),
+			 register_name(offset, mmio_base, buf, sizeof(buf)),
 			 a[n] & mask, b[n] & mask);
 		num_errors++;
 	}
@@ -638,7 +675,7 @@ static void nonpriv(int fd,
 
 		igt_spin_free(fd, spin);
 
-		compare_regs(fd, tmpl, regs[1], "nonpriv read/writes");
+		compare_regs(fd, e, tmpl, regs[1], "nonpriv read/writes");
 
 		for (int n = 0; n < ARRAY_SIZE(regs); n++)
 			gem_close(fd, regs[n]);
@@ -708,8 +745,9 @@ static void isolation(int fd,
 		igt_spin_free(fd, spin);
 
 		if (!(flags & DIRTY1))
-			compare_regs(fd, regs[0], tmp, "two reads of the same ctx");
-		compare_regs(fd, regs[0], regs[1], "two virgin contexts");
+			compare_regs(fd, e, regs[0], tmp,
+				     "two reads of the same ctx");
+		compare_regs(fd, e, regs[0], regs[1], "two virgin contexts");
 
 		for (int n = 0; n < ARRAY_SIZE(ctx); n++) {
 			gem_close(fd, regs[n]);
@@ -829,13 +867,13 @@ static void preservation(int fd,
 		char buf[80];
 
 		snprintf(buf, sizeof(buf), "dirty %x context\n", values[v]);
-		compare_regs(fd, regs[v][0], regs[v][1], buf);
+		compare_regs(fd, e, regs[v][0], regs[v][1], buf);
 
 		gem_close(fd, regs[v][0]);
 		gem_close(fd, regs[v][1]);
 		gem_context_destroy(fd, ctx[v]);
 	}
-	compare_regs(fd, regs[num_values][0], regs[num_values][1], "clean");
+	compare_regs(fd, e, regs[num_values][0], regs[num_values][1], "clean");
 	gem_context_destroy(fd, ctx[num_values]);
 }
 
-- 
2.24.0.rc0

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* [Intel-gfx] [PATCH i-g-t 5/9] i915/gem_ctx_isolation: Check engine relative registers
@ 2019-10-24 10:54   ` Chris Wilson
  0 siblings, 0 replies; 20+ messages in thread
From: Chris Wilson @ 2019-10-24 10:54 UTC (permalink / raw)
  To: intel-gfx

Some of the non-privileged registers are at the same offset on each
engine. We can improve our coverage for unknown HW layout by using the
reported engine->mmio_base for relative offsets.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 tests/i915/gem_ctx_isolation.c | 160 ++++++++++++++++++++-------------
 1 file changed, 99 insertions(+), 61 deletions(-)

diff --git a/tests/i915/gem_ctx_isolation.c b/tests/i915/gem_ctx_isolation.c
index 6aa27133c..5e82c31c2 100644
--- a/tests/i915/gem_ctx_isolation.c
+++ b/tests/i915/gem_ctx_isolation.c
@@ -70,6 +70,7 @@ static const struct named_register {
 	uint32_t ignore_bits;
 	uint32_t write_mask; /* some registers bits do not exist */
 	bool masked;
+	bool relative;
 } nonpriv_registers[] = {
 	{ "NOPID", NOCTX, RCS0, 0x2094 },
 	{ "MI_PREDICATE_RESULT_2", NOCTX, RCS0, 0x23bc },
@@ -150,67 +151,45 @@ static const struct named_register {
 	{ "HALF_SLICE_CHICKEN7", GEN_RANGE(11, 11), RCS0, 0xe194, .masked = true },
 	{ "SAMPLER_MODE", GEN_RANGE(11, 11), RCS0, 0xe18c, .masked = true },
 
-	{ "BCS_GPR", GEN9, BCS0, 0x22600, 32 },
 	{ "BCS_SWCTRL", GEN8, BCS0, 0x22200, .write_mask = 0x3, .masked = true },
 
 	{ "MFC_VDBOX1", NOCTX, VCS0, 0x12800, 64 },
 	{ "MFC_VDBOX2", NOCTX, VCS1, 0x1c800, 64 },
 
-	{ "VCS0_GPR", GEN_RANGE(9, 10), VCS0, 0x12600, 32 },
-	{ "VCS1_GPR", GEN_RANGE(9, 10), VCS1, 0x1c600, 32 },
-	{ "VECS_GPR", GEN_RANGE(9, 10), VECS0, 0x1a600, 32 },
-
-	{ "VCS0_GPR", GEN11, VCS0, 0x1c0600, 32 },
-	{ "VCS1_GPR", GEN11, VCS1, 0x1c4600, 32 },
-	{ "VCS2_GPR", GEN11, VCS2, 0x1d0600, 32 },
-	{ "VCS3_GPR", GEN11, VCS3, 0x1d4600, 32 },
-	{ "VECS_GPR", GEN11, VECS0, 0x1c8600, 32 },
+	{ "xCS_GPR", GEN9, ALL, 0x600, 32, .relative = true },
 
 	{}
 }, ignore_registers[] = {
 	{ "RCS timestamp", GEN6, ~0u, 0x2358 },
 	{ "BCS timestamp", GEN7, ~0u, 0x22358 },
 
-	{ "VCS0 timestamp", GEN_RANGE(7, 10), ~0u, 0x12358 },
-	{ "VCS1 timestamp", GEN_RANGE(7, 10), ~0u, 0x1c358 },
-	{ "VECS timestamp", GEN_RANGE(8, 10), ~0u, 0x1a358 },
-
-	{ "VCS0 timestamp", GEN11, ~0u, 0x1c0358 },
-	{ "VCS1 timestamp", GEN11, ~0u, 0x1c4358 },
-	{ "VCS2 timestamp", GEN11, ~0u, 0x1d0358 },
-	{ "VCS3 timestamp", GEN11, ~0u, 0x1d4358 },
-	{ "VECS timestamp", GEN11, ~0u, 0x1c8358 },
+	{ "xCS timestamp", GEN8, ALL, 0x358, .relative = true },
 
 	/* huc read only */
-	{ "BSD0 0x2000", GEN11, ~0u, 0x1c0000 + 0x2000 },
-	{ "BSD0 0x2000", GEN11, ~0u, 0x1c0000 + 0x2014 },
-	{ "BSD0 0x2000", GEN11, ~0u, 0x1c0000 + 0x23b0 },
-
-	{ "BSD1 0x2000", GEN11, ~0u, 0x1c4000 + 0x2000 },
-	{ "BSD1 0x2000", GEN11, ~0u, 0x1c4000 + 0x2014 },
-	{ "BSD1 0x2000", GEN11, ~0u, 0x1c4000 + 0x23b0 },
-
-	{ "BSD2 0x2000", GEN11, ~0u, 0x1d0000 + 0x2000 },
-	{ "BSD2 0x2000", GEN11, ~0u, 0x1d0000 + 0x2014 },
-	{ "BSD2 0x2000", GEN11, ~0u, 0x1d0000 + 0x23b0 },
-
-	{ "BSD3 0x2000", GEN11, ~0u, 0x1d4000 + 0x2000 },
-	{ "BSD3 0x2000", GEN11, ~0u, 0x1d4000 + 0x2014 },
-	{ "BSD3 0x2000", GEN11, ~0u, 0x1d4000 + 0x23b0 },
+	{ "BSD 0x2000", GEN11, ALL, 0x2000, .relative = true },
+	{ "BSD 0x2014", GEN11, ALL, 0x2014, .relative = true },
+	{ "BSD 0x23b0", GEN11, ALL, 0x23b0, .relative = true },
 
 	{}
 };
 
-static const char *register_name(uint32_t offset, char *buf, size_t len)
+static const char *
+register_name(uint32_t offset, uint32_t mmio_base, char *buf, size_t len)
 {
 	for (const struct named_register *r = nonpriv_registers; r->name; r++) {
 		unsigned int width = r->count ? 4*r->count : 4;
-		if (offset >= r->offset && offset < r->offset + width) {
+		uint32_t base;
+
+		base = r->offset;
+		if (r->relative)
+			base += mmio_base;
+
+		if (offset >= base && offset < base + width) {
 			if (r->count <= 1)
 				return r->name;
 
 			snprintf(buf, len, "%s[%d]",
-				 r->name, (offset - r->offset)/4);
+				 r->name, (offset - base) / 4);
 			return buf;
 		}
 	}
@@ -218,22 +197,35 @@ static const char *register_name(uint32_t offset, char *buf, size_t len)
 	return "unknown";
 }
 
-static const struct named_register *lookup_register(uint32_t offset)
+static const struct named_register *
+lookup_register(uint32_t offset, uint32_t mmio_base)
 {
 	for (const struct named_register *r = nonpriv_registers; r->name; r++) {
 		unsigned int width = r->count ? 4*r->count : 4;
-		if (offset >= r->offset && offset < r->offset + width)
+		uint32_t base;
+
+		base = r->offset;
+		if (r->relative)
+			base += mmio_base;
+
+		if (offset >= base && offset < base + width)
 			return r;
 	}
 
 	return NULL;
 }
 
-static bool ignore_register(uint32_t offset)
+static bool ignore_register(uint32_t offset, uint32_t mmio_base)
 {
 	for (const struct named_register *r = ignore_registers; r->name; r++) {
 		unsigned int width = r->count ? 4*r->count : 4;
-		if (offset >= r->offset && offset < r->offset + width)
+		uint32_t base;
+
+		base = r->offset;
+		if (r->relative)
+			base += mmio_base;
+
+		if (offset >= base && offset < base + width)
 			return true;
 	}
 
@@ -248,6 +240,7 @@ static void tmpl_regs(int fd,
 {
 	const unsigned int gen_bit = 1 << intel_gen(intel_get_drm_devid(fd));
 	const unsigned int engine_bit = ENGINE(e->class, e->instance);
+	const uint32_t mmio_base = gem_engine_mmio_base(fd, e->name);
 	unsigned int regs_size;
 	uint32_t *regs;
 
@@ -259,12 +252,20 @@ static void tmpl_regs(int fd,
 		       I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
 
 	for (const struct named_register *r = nonpriv_registers; r->name; r++) {
+		uint32_t offset;
+
 		if (!(r->engine_mask & engine_bit))
 			continue;
 		if (!(r->gen_mask & gen_bit))
 			continue;
-		for (unsigned count = r->count ?: 1, offset = r->offset;
-		     count--; offset += 4) {
+		if (r->relative && !mmio_base)
+			continue;
+
+		offset = r->offset;
+		if (r->relative)
+			offset += mmio_base;
+
+		for (unsigned count = r->count ?: 1; count--; offset += 4) {
 			uint32_t x = value;
 			if (r->write_mask)
 				x &= r->write_mask;
@@ -284,6 +285,7 @@ static uint32_t read_regs(int fd,
 	const unsigned int gen = intel_gen(intel_get_drm_devid(fd));
 	const unsigned int gen_bit = 1 << gen;
 	const unsigned int engine_bit = ENGINE(e->class, e->instance);
+	const uint32_t mmio_base = gem_engine_mmio_base(fd, e->name);
 	const bool r64b = gen >= 8;
 	struct drm_i915_gem_exec_object2 obj[2];
 	struct drm_i915_gem_relocation_entry *reloc;
@@ -311,13 +313,20 @@ static uint32_t read_regs(int fd,
 
 	n = 0;
 	for (const struct named_register *r = nonpriv_registers; r->name; r++) {
+		uint32_t offset;
+
 		if (!(r->engine_mask & engine_bit))
 			continue;
 		if (!(r->gen_mask & gen_bit))
 			continue;
+		if (r->relative && !mmio_base)
+			continue;
+
+		offset = r->offset;
+		if (r->relative)
+			offset += mmio_base;
 
-		for (unsigned count = r->count ?: 1, offset = r->offset;
-		     count--; offset += 4) {
+		for (unsigned count = r->count ?: 1; count--; offset += 4) {
 			*b++ = 0x24 << 23 | (1 + r64b); /* SRM */
 			*b++ = offset;
 			reloc[n].target_handle = obj[0].handle;
@@ -357,6 +366,7 @@ static void write_regs(int fd,
 {
 	const unsigned int gen_bit = 1 << intel_gen(intel_get_drm_devid(fd));
 	const unsigned int engine_bit = ENGINE(e->class, e->instance);
+	const uint32_t mmio_base = gem_engine_mmio_base(fd, e->name);
 	struct drm_i915_gem_exec_object2 obj;
 	struct drm_i915_gem_execbuffer2 execbuf;
 	unsigned int batch_size;
@@ -372,12 +382,20 @@ static void write_regs(int fd,
 	gem_set_domain(fd, obj.handle,
 		       I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
 	for (const struct named_register *r = nonpriv_registers; r->name; r++) {
+		uint32_t offset;
+
 		if (!(r->engine_mask & engine_bit))
 			continue;
 		if (!(r->gen_mask & gen_bit))
 			continue;
-		for (unsigned count = r->count ?: 1, offset = r->offset;
-		     count--; offset += 4) {
+		if (r->relative && !mmio_base)
+			continue;
+
+		offset = r->offset;
+		if (r->relative)
+			offset += mmio_base;
+
+		for (unsigned count = r->count ?: 1; count--; offset += 4) {
 			uint32_t x = value;
 			if (r->write_mask)
 				x &= r->write_mask;
@@ -410,6 +428,7 @@ static void restore_regs(int fd,
 	const unsigned int gen = intel_gen(intel_get_drm_devid(fd));
 	const unsigned int gen_bit = 1 << gen;
 	const unsigned int engine_bit = ENGINE(e->class, e->instance);
+	const uint32_t mmio_base = gem_engine_mmio_base(fd, e->name);
 	const bool r64b = gen >= 8;
 	struct drm_i915_gem_exec_object2 obj[2];
 	struct drm_i915_gem_execbuffer2 execbuf;
@@ -437,13 +456,20 @@ static void restore_regs(int fd,
 
 	n = 0;
 	for (const struct named_register *r = nonpriv_registers; r->name; r++) {
+		uint32_t offset;
+
 		if (!(r->engine_mask & engine_bit))
 			continue;
 		if (!(r->gen_mask & gen_bit))
 			continue;
+		if (r->relative && !mmio_base)
+			continue;
+
+		offset = r->offset;
+		if (r->relative)
+			offset += mmio_base;
 
-		for (unsigned count = r->count ?: 1, offset = r->offset;
-		     count--; offset += 4) {
+		for (unsigned count = r->count ?: 1; count--; offset += 4) {
 			*b++ = 0x29 << 23 | (1 + r64b); /* LRM */
 			*b++ = offset;
 			reloc[n].target_handle = obj[0].handle;
@@ -479,6 +505,7 @@ static void dump_regs(int fd,
 	const int gen = intel_gen(intel_get_drm_devid(fd));
 	const unsigned int gen_bit = 1 << gen;
 	const unsigned int engine_bit = ENGINE(e->class, e->instance);
+	const uint32_t mmio_base = gem_engine_mmio_base(fd, e->name);
 	unsigned int regs_size;
 	uint32_t *out;
 
@@ -489,26 +516,36 @@ static void dump_regs(int fd,
 	gem_set_domain(fd, regs, I915_GEM_DOMAIN_CPU, 0);
 
 	for (const struct named_register *r = nonpriv_registers; r->name; r++) {
+		uint32_t offset;
+
 		if (!(r->engine_mask & engine_bit))
 			continue;
 		if (!(r->gen_mask & gen_bit))
 			continue;
+		if (r->relative && !mmio_base)
+			continue;
+
+		offset = r->offset;
+		if (r->relative)
+			offset += mmio_base;
 
 		if (r->count <= 1) {
 			igt_debug("0x%04x (%s): 0x%08x\n",
-				  r->offset, r->name, out[r->offset/4]);
+				  offset, r->name, out[offset / 4]);
 		} else {
 			for (unsigned x = 0; x < r->count; x++)
 				igt_debug("0x%04x (%s[%d]): 0x%08x\n",
-					  r->offset+4*x, r->name, x,
-					  out[r->offset/4 + x]);
+					  offset + 4 * x, r->name, x,
+					  out[offset / 4 + x]);
 		}
 	}
 	munmap(out, regs_size);
 }
 
-static void compare_regs(int fd, uint32_t A, uint32_t B, const char *who)
+static void compare_regs(int fd, const struct intel_execution_engine2 *e,
+			 uint32_t A, uint32_t B, const char *who)
 {
+	const uint32_t mmio_base = gem_engine_mmio_base(fd, e->name);
 	unsigned int num_errors;
 	unsigned int regs_size;
 	uint32_t *a, *b;
@@ -532,11 +569,11 @@ static void compare_regs(int fd, uint32_t A, uint32_t B, const char *who)
 		if (a[n] == b[n])
 			continue;
 
-		if (ignore_register(offset))
+		if (ignore_register(offset, mmio_base))
 			continue;
 
 		mask = ~0u;
-		r = lookup_register(offset);
+		r = lookup_register(offset, mmio_base);
 		if (r && r->masked)
 			mask >>= 16;
 		if (r && r->ignore_bits)
@@ -547,7 +584,7 @@ static void compare_regs(int fd, uint32_t A, uint32_t B, const char *who)
 
 		igt_warn("Register 0x%04x (%s): A=%08x B=%08x\n",
 			 offset,
-			 register_name(offset, buf, sizeof(buf)),
+			 register_name(offset, mmio_base, buf, sizeof(buf)),
 			 a[n] & mask, b[n] & mask);
 		num_errors++;
 	}
@@ -638,7 +675,7 @@ static void nonpriv(int fd,
 
 		igt_spin_free(fd, spin);
 
-		compare_regs(fd, tmpl, regs[1], "nonpriv read/writes");
+		compare_regs(fd, e, tmpl, regs[1], "nonpriv read/writes");
 
 		for (int n = 0; n < ARRAY_SIZE(regs); n++)
 			gem_close(fd, regs[n]);
@@ -708,8 +745,9 @@ static void isolation(int fd,
 		igt_spin_free(fd, spin);
 
 		if (!(flags & DIRTY1))
-			compare_regs(fd, regs[0], tmp, "two reads of the same ctx");
-		compare_regs(fd, regs[0], regs[1], "two virgin contexts");
+			compare_regs(fd, e, regs[0], tmp,
+				     "two reads of the same ctx");
+		compare_regs(fd, e, regs[0], regs[1], "two virgin contexts");
 
 		for (int n = 0; n < ARRAY_SIZE(ctx); n++) {
 			gem_close(fd, regs[n]);
@@ -829,13 +867,13 @@ static void preservation(int fd,
 		char buf[80];
 
 		snprintf(buf, sizeof(buf), "dirty %x context\n", values[v]);
-		compare_regs(fd, regs[v][0], regs[v][1], buf);
+		compare_regs(fd, e, regs[v][0], regs[v][1], buf);
 
 		gem_close(fd, regs[v][0]);
 		gem_close(fd, regs[v][1]);
 		gem_context_destroy(fd, ctx[v]);
 	}
-	compare_regs(fd, regs[num_values][0], regs[num_values][1], "clean");
+	compare_regs(fd, e, regs[num_values][0], regs[num_values][1], "clean");
 	gem_context_destroy(fd, ctx[num_values]);
 }
 
-- 
2.24.0.rc0

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^ permalink raw reply related	[flat|nested] 20+ messages in thread
* [PATCH i-g-t 6/9] i915: Exercise preemption timeout controls in sysfs
@ 2019-10-24 10:54   ` Chris Wilson
  0 siblings, 0 replies; 20+ messages in thread
From: Chris Wilson @ 2019-10-24 10:54 UTC (permalink / raw)
  To: intel-gfx

We [will] expose various per-engine scheduling controls. One of which,
'preempt_timeout_ms', defines how we wait for a preemption request to be
honoured by the currently executing context. If it fails to relieve the
GPU within the required timeout, the engine is reset and the miscreant
forcibly evicted.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 lib/i915/gem_context.c             |  41 ++++
 lib/i915/gem_context.h             |   2 +
 tests/Makefile.sources             |   1 +
 tests/i915/sysfs_preempt_timeout.c | 353 +++++++++++++++++++++++++++++
 tests/meson.build                  |   1 +
 5 files changed, 398 insertions(+)
 create mode 100644 tests/i915/sysfs_preempt_timeout.c

diff --git a/lib/i915/gem_context.c b/lib/i915/gem_context.c
index 1fae5191f..aa083c2f0 100644
--- a/lib/i915/gem_context.c
+++ b/lib/i915/gem_context.c
@@ -403,3 +403,44 @@ bool gem_context_has_engine(int fd, uint32_t ctx, uint64_t engine)
 
 	return __gem_execbuf(fd, &execbuf) == -ENOENT;
 }
+
+static int create_ext_ioctl(int i915,
+			    struct drm_i915_gem_context_create_ext *arg)
+{
+	int err;
+
+	err = 0;
+	if (igt_ioctl(i915, DRM_IOCTL_I915_GEM_CONTEXT_CREATE_EXT, arg)) {
+		err = -errno;
+		igt_assume(err);
+	}
+
+	errno = 0;
+	return err;
+}
+
+uint32_t gem_context_create_for_engine(int i915, unsigned int class, unsigned int inst)
+{
+	I915_DEFINE_CONTEXT_PARAM_ENGINES(engines, 1) = {
+		.engines = { { .engine_class = class, .engine_instance = inst } }
+	};
+	struct drm_i915_gem_context_create_ext_setparam p_engines = {
+		.base = {
+			.name = I915_CONTEXT_CREATE_EXT_SETPARAM,
+			.next_extension = 0, /* end of chain */
+		},
+		.param = {
+			.param = I915_CONTEXT_PARAM_ENGINES,
+			.value = to_user_pointer(&engines),
+			.size = sizeof(engines),
+		},
+	};
+	struct drm_i915_gem_context_create_ext create = {
+		.flags = I915_CONTEXT_CREATE_FLAGS_USE_EXTENSIONS,
+		.extensions = to_user_pointer(&p_engines),
+	};
+
+	igt_assert_eq(create_ext_ioctl(i915, &create), 0);
+	igt_assert_neq(create.ctx_id, 0);
+	return create.ctx_id;
+}
diff --git a/lib/i915/gem_context.h b/lib/i915/gem_context.h
index c0d4c9615..9e0a083f0 100644
--- a/lib/i915/gem_context.h
+++ b/lib/i915/gem_context.h
@@ -34,6 +34,8 @@ 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);
 
+uint32_t gem_context_create_for_engine(int fd, unsigned int class, unsigned int inst);
+
 int __gem_context_clone(int i915,
 			uint32_t src, unsigned int share,
 			unsigned int flags,
diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index 093eb57f3..c9901af18 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -98,6 +98,7 @@ TESTS_progs = \
 	tools_test \
 	vgem_basic \
 	vgem_slow \
+	i915/sysfs_preempt_timeout \
 	$(NULL)
 
 TESTS_progs += gem_bad_reloc
diff --git a/tests/i915/sysfs_preempt_timeout.c b/tests/i915/sysfs_preempt_timeout.c
new file mode 100644
index 000000000..9bdd8199b
--- /dev/null
+++ b/tests/i915/sysfs_preempt_timeout.c
@@ -0,0 +1,353 @@
+/*
+ * Copyright © 2019 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 <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "drmtest.h" /* gem_quiescent_gpu()! */
+#include "i915/gem_engine_topology.h"
+#include "igt_dummyload.h"
+#include "igt_sysfs.h"
+#include "ioctl_wrappers.h" /* igt_require_gem()! */
+#include "sw_sync.h"
+
+#include "igt_debugfs.h"
+
+static bool __enable_hangcheck(int dir, bool state)
+{
+	return igt_sysfs_set(dir, "enable_hangcheck", state ? "1" : "0");
+}
+
+static bool enable_hangcheck(int i915, bool state)
+{
+	bool success;
+	int dir;
+
+	dir = igt_sysfs_open_parameters(i915);
+	if (dir < 0) /* no parameters, must be default! */
+		return false;
+
+	success = __enable_hangcheck(dir, state);
+	close(dir);
+
+	return success;
+}
+
+static void set_preempt_timeout(int engine, unsigned int value)
+{
+	unsigned int delay;
+
+	igt_sysfs_printf(engine, "preempt_timeout_ms", "%u", value);
+	igt_sysfs_scanf(engine, "preempt_timeout_ms", "%u", &delay);
+	igt_assert_eq(delay, value);
+}
+
+static void test_idempotent(int i915, int engine)
+{
+	unsigned int delays[] = { 0, 1, 1000, 1234, 654321 };
+	unsigned int saved;
+
+	/* Quick test that store/show reports the same values */
+
+	igt_assert(igt_sysfs_scanf(engine, "preempt_timeout_ms", "%u", &saved) == 1);
+	igt_debug("Initial preempt_timeout_ms:%u\n", saved);
+
+	for (int i = 0; i < ARRAY_SIZE(delays); i++)
+		set_preempt_timeout(engine, delays[i]);
+
+	set_preempt_timeout(engine, saved);
+}
+
+static void test_invalid(int i915, int engine)
+{
+	unsigned int saved, delay;
+
+	/* Quick test that values that are not representable are rejected */
+
+	igt_assert(igt_sysfs_scanf(engine, "preempt_timeout_ms", "%u", &saved) == 1);
+	igt_debug("Initial preempt_timeout_ms:%u\n", saved);
+
+	igt_sysfs_printf(engine, "preempt_timeout_ms", PRIu64, -1);
+	igt_sysfs_scanf(engine, "preempt_timeout_ms", "%u", &delay);
+	igt_assert_eq(delay, saved);
+
+	igt_sysfs_printf(engine, "preempt_timeout_ms", "%d", -1);
+	igt_sysfs_scanf(engine, "preempt_timeout_ms", "%u", &delay);
+	igt_assert_eq(delay, saved);
+
+	igt_sysfs_printf(engine, "preempt_timeout_ms", PRIu64, 40ull << 32);
+	igt_sysfs_scanf(engine, "preempt_timeout_ms", "%u", &delay);
+	igt_assert_eq(delay, saved);
+}
+
+static void set_unbannable(int i915, uint32_t ctx)
+{
+	struct drm_i915_gem_context_param p = {
+		.ctx_id = ctx,
+		.param = I915_CONTEXT_PARAM_BANNABLE,
+	};
+
+	igt_assert_eq(__gem_context_set_param(i915, &p), 0);
+}
+
+static uint32_t create_context(int i915, unsigned int class, unsigned int inst, int prio)
+{
+	uint32_t ctx;
+
+	ctx = gem_context_create_for_engine(i915, class, inst);
+	set_unbannable(i915, ctx);
+	gem_context_set_priority(i915, ctx, prio);
+
+	return ctx;
+}
+
+static uint64_t __test_timeout(int i915, int engine, unsigned int timeout)
+{
+	unsigned int class, inst;
+	struct timespec ts = {};
+	igt_spin_t *spin[2];
+	uint64_t elapsed;
+	uint32_t ctx[2];
+
+	igt_assert(igt_sysfs_scanf(engine, "class", "%u", &class) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "instance", "%u", &inst) == 1);
+
+	set_preempt_timeout(engine, timeout);
+
+	ctx[0] = create_context(i915, class, inst, -1023);
+	spin[0] = igt_spin_new(i915, ctx[0],
+			       .flags = (IGT_SPIN_NO_PREEMPTION |
+					 IGT_SPIN_POLL_RUN |
+					 IGT_SPIN_FENCE_OUT));
+	igt_spin_busywait_until_started(spin[0]);
+
+	ctx[1] = create_context(i915, class, inst, 1023);
+	igt_nsec_elapsed(&ts);
+	spin[1] = igt_spin_new(i915, ctx[1], .flags = IGT_SPIN_POLL_RUN);
+	igt_spin_busywait_until_started(spin[1]);
+	elapsed = igt_nsec_elapsed(&ts);
+
+	igt_spin_free(i915, spin[1]);
+
+	igt_assert_eq(sync_fence_wait(spin[0]->out_fence, 1), 0);
+	igt_assert_eq(sync_fence_status(spin[0]->out_fence), -EIO);
+
+	igt_spin_free(i915, spin[0]);
+
+	gem_context_destroy(i915, ctx[1]);
+	gem_context_destroy(i915, ctx[0]);
+	gem_quiescent_gpu(i915);
+
+	return elapsed;
+}
+
+static void test_timeout(int i915, int engine)
+{
+	int delays[] = { 1, 50, 100, 500 };
+	unsigned int saved;
+
+	/*
+	 * Send down some non-preemptable workloads and then request a
+	 * switch to a higher priority context. The HW will not be able to
+	 * respond, so the kernel will be forced to reset the hog. This
+	 * timeout should match our specification, and so we can measure
+	 * the delay from requesting the preemption to its completion.
+	 */
+
+	igt_assert(igt_sysfs_scanf(engine, "preempt_timeout_ms", "%u", &saved) == 1);
+	igt_debug("Initial preempt_timeout_ms:%u\n", saved);
+
+	gem_quiescent_gpu(i915);
+	igt_require(enable_hangcheck(i915, false));
+
+	for (int i = 0; i < ARRAY_SIZE(delays); i++) {
+		uint64_t elapsed;
+
+		elapsed = __test_timeout(i915, engine, delays[i]);
+		igt_info("preempt_timeout_ms:%d, elapsed=%.3fms\n",
+			 delays[i], elapsed * 1e-6);
+
+		/*
+		 * We need to give a couple of jiffies slack for the scheduler timeouts
+		 * and then a little more slack fr the overhead in submitting and
+		 * measuring. 50ms should cover all of our sins and be useful
+		 * tolerance.
+		 */
+		igt_assert_f(elapsed / 1000 / 1000 < delays[i] + 50,
+			     "Forced preemption timeout exceeded request!\n");
+	}
+
+	igt_assert(enable_hangcheck(i915, true));
+	gem_quiescent_gpu(i915);
+	set_preempt_timeout(engine, saved);
+}
+
+static void test_off(int i915, int engine)
+{
+	unsigned int class, inst;
+	igt_spin_t *spin[2];
+	unsigned int saved;
+	uint32_t ctx[2];
+
+	/*
+	 * We support setting the timeout to 0 to disable the reset on
+	 * preemption failure. Having established that we can do forced
+	 * preemption on demand, we use the same setup (non-preeemptable hog
+	 * followed by a high priority context) and verify that the hog is
+	 * never reset. Never is a long time, so we settle for 150s.
+	 */
+
+	igt_assert(igt_sysfs_scanf(engine, "preempt_timeout_ms", "%u", &saved) == 1);
+	igt_debug("Initial preempt_timeout_ms:%u\n", saved);
+
+	gem_quiescent_gpu(i915);
+	igt_require(enable_hangcheck(i915, false));
+
+	igt_assert(igt_sysfs_scanf(engine, "class", "%u", &class) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "instance", "%u", &inst) == 1);
+
+	set_preempt_timeout(engine, 0);
+
+	ctx[0] = create_context(i915, class, inst, -1023);
+	spin[0] = igt_spin_new(i915, ctx[0],
+			       .flags = (IGT_SPIN_NO_PREEMPTION |
+					 IGT_SPIN_POLL_RUN |
+					 IGT_SPIN_FENCE_OUT));
+	igt_spin_busywait_until_started(spin[0]);
+
+	ctx[1] = create_context(i915, class, inst, 1023);
+	spin[1] = igt_spin_new(i915, ctx[1], .flags = IGT_SPIN_POLL_RUN);
+
+	for (int i = 0; i < 150; i++) {
+		igt_assert_eq(sync_fence_status(spin[0]->out_fence), 0);
+		sleep(1);
+	}
+
+	set_preempt_timeout(engine, 1);
+
+	igt_spin_busywait_until_started(spin[1]);
+	igt_spin_free(i915, spin[1]);
+
+	igt_assert_eq(sync_fence_wait(spin[0]->out_fence, 1), 0);
+	igt_assert_eq(sync_fence_status(spin[0]->out_fence), -EIO);
+
+	igt_spin_free(i915, spin[0]);
+
+	gem_context_destroy(i915, ctx[1]);
+	gem_context_destroy(i915, ctx[0]);
+
+	igt_assert(enable_hangcheck(i915, true));
+	gem_quiescent_gpu(i915);
+
+	set_preempt_timeout(engine, saved);
+}
+
+#if 0
+static void each_engines(int fd)
+{
+	struct dirent *de;
+	DIR *dir;
+
+	dir = fdopendir(fd);
+	while (dir && (de = readdir(dir))) {
+		int engine = openat(engines, de->d_name, O_RDONLY);
+		char *name;
+
+		name = igt_sysfs_get(engine, "name");
+		if (!name)
+			continue;
+
+		igt_subtest_group {
+			igt_fixture {
+				igt_require(fstatat(engine,
+							"preempt_timeout_ms",
+							&st, 0) == 0);
+			}
+		}
+	}
+	closedir(dir);
+}
+#endif
+
+igt_main
+{
+	const struct intel_execution_engine2 *it;
+	int i915 = -1, engines = -1;
+
+	igt_fixture {
+		int sys;
+
+		i915 = drm_open_driver(DRIVER_INTEL);
+		igt_require_gem(i915);
+
+		sys = igt_sysfs_open(i915);
+		igt_require(sys != -1);
+
+		engines = openat(sys, "engine", O_RDONLY);
+		igt_require(engines != -1);
+
+		close(sys);
+	}
+
+	__for_each_static_engine(it) {
+		igt_subtest_group {
+			int engine = -1;
+			char *name = NULL;
+
+			igt_fixture {
+				struct stat st;
+
+				engine = openat(engines, it->name, O_RDONLY);
+				igt_require(fstatat(engine,
+						    "preempt_timeout_ms",
+						    &st, 0) == 0);
+
+				name = igt_sysfs_get(engine, "name");
+			}
+			if (!name)
+				continue;
+
+			igt_subtest_f("%s-idempotent", name)
+				test_idempotent(i915, engine);
+			igt_subtest_f("%s-invalid", name)
+				test_invalid(i915, engine);
+			igt_subtest_f("%s-timeout", name)
+				test_timeout(i915, engine);
+			igt_subtest_f("%s-off", name)
+				test_off(i915, engine);
+
+			free(name);
+			close(engine);
+		}
+	}
+
+	igt_fixture {
+		close(engines);
+		close(i915);
+	}
+}
diff --git a/tests/meson.build b/tests/meson.build
index 3f3eee277..507434942 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -238,6 +238,7 @@ i915_progs = [
 	'i915_query',
 	'i915_selftest',
 	'i915_suspend',
+	'sysfs_preempt_timeout',
 ]
 
 test_deps = [ igt_deps ]
-- 
2.24.0.rc0

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^ permalink raw reply related	[flat|nested] 20+ messages in thread
* [Intel-gfx] [PATCH i-g-t 6/9] i915: Exercise preemption timeout controls in sysfs
@ 2019-10-24 10:54   ` Chris Wilson
  0 siblings, 0 replies; 20+ messages in thread
From: Chris Wilson @ 2019-10-24 10:54 UTC (permalink / raw)
  To: intel-gfx

We [will] expose various per-engine scheduling controls. One of which,
'preempt_timeout_ms', defines how we wait for a preemption request to be
honoured by the currently executing context. If it fails to relieve the
GPU within the required timeout, the engine is reset and the miscreant
forcibly evicted.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 lib/i915/gem_context.c             |  41 ++++
 lib/i915/gem_context.h             |   2 +
 tests/Makefile.sources             |   1 +
 tests/i915/sysfs_preempt_timeout.c | 353 +++++++++++++++++++++++++++++
 tests/meson.build                  |   1 +
 5 files changed, 398 insertions(+)
 create mode 100644 tests/i915/sysfs_preempt_timeout.c

diff --git a/lib/i915/gem_context.c b/lib/i915/gem_context.c
index 1fae5191f..aa083c2f0 100644
--- a/lib/i915/gem_context.c
+++ b/lib/i915/gem_context.c
@@ -403,3 +403,44 @@ bool gem_context_has_engine(int fd, uint32_t ctx, uint64_t engine)
 
 	return __gem_execbuf(fd, &execbuf) == -ENOENT;
 }
+
+static int create_ext_ioctl(int i915,
+			    struct drm_i915_gem_context_create_ext *arg)
+{
+	int err;
+
+	err = 0;
+	if (igt_ioctl(i915, DRM_IOCTL_I915_GEM_CONTEXT_CREATE_EXT, arg)) {
+		err = -errno;
+		igt_assume(err);
+	}
+
+	errno = 0;
+	return err;
+}
+
+uint32_t gem_context_create_for_engine(int i915, unsigned int class, unsigned int inst)
+{
+	I915_DEFINE_CONTEXT_PARAM_ENGINES(engines, 1) = {
+		.engines = { { .engine_class = class, .engine_instance = inst } }
+	};
+	struct drm_i915_gem_context_create_ext_setparam p_engines = {
+		.base = {
+			.name = I915_CONTEXT_CREATE_EXT_SETPARAM,
+			.next_extension = 0, /* end of chain */
+		},
+		.param = {
+			.param = I915_CONTEXT_PARAM_ENGINES,
+			.value = to_user_pointer(&engines),
+			.size = sizeof(engines),
+		},
+	};
+	struct drm_i915_gem_context_create_ext create = {
+		.flags = I915_CONTEXT_CREATE_FLAGS_USE_EXTENSIONS,
+		.extensions = to_user_pointer(&p_engines),
+	};
+
+	igt_assert_eq(create_ext_ioctl(i915, &create), 0);
+	igt_assert_neq(create.ctx_id, 0);
+	return create.ctx_id;
+}
diff --git a/lib/i915/gem_context.h b/lib/i915/gem_context.h
index c0d4c9615..9e0a083f0 100644
--- a/lib/i915/gem_context.h
+++ b/lib/i915/gem_context.h
@@ -34,6 +34,8 @@ 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);
 
+uint32_t gem_context_create_for_engine(int fd, unsigned int class, unsigned int inst);
+
 int __gem_context_clone(int i915,
 			uint32_t src, unsigned int share,
 			unsigned int flags,
diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index 093eb57f3..c9901af18 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -98,6 +98,7 @@ TESTS_progs = \
 	tools_test \
 	vgem_basic \
 	vgem_slow \
+	i915/sysfs_preempt_timeout \
 	$(NULL)
 
 TESTS_progs += gem_bad_reloc
diff --git a/tests/i915/sysfs_preempt_timeout.c b/tests/i915/sysfs_preempt_timeout.c
new file mode 100644
index 000000000..9bdd8199b
--- /dev/null
+++ b/tests/i915/sysfs_preempt_timeout.c
@@ -0,0 +1,353 @@
+/*
+ * Copyright © 2019 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 <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "drmtest.h" /* gem_quiescent_gpu()! */
+#include "i915/gem_engine_topology.h"
+#include "igt_dummyload.h"
+#include "igt_sysfs.h"
+#include "ioctl_wrappers.h" /* igt_require_gem()! */
+#include "sw_sync.h"
+
+#include "igt_debugfs.h"
+
+static bool __enable_hangcheck(int dir, bool state)
+{
+	return igt_sysfs_set(dir, "enable_hangcheck", state ? "1" : "0");
+}
+
+static bool enable_hangcheck(int i915, bool state)
+{
+	bool success;
+	int dir;
+
+	dir = igt_sysfs_open_parameters(i915);
+	if (dir < 0) /* no parameters, must be default! */
+		return false;
+
+	success = __enable_hangcheck(dir, state);
+	close(dir);
+
+	return success;
+}
+
+static void set_preempt_timeout(int engine, unsigned int value)
+{
+	unsigned int delay;
+
+	igt_sysfs_printf(engine, "preempt_timeout_ms", "%u", value);
+	igt_sysfs_scanf(engine, "preempt_timeout_ms", "%u", &delay);
+	igt_assert_eq(delay, value);
+}
+
+static void test_idempotent(int i915, int engine)
+{
+	unsigned int delays[] = { 0, 1, 1000, 1234, 654321 };
+	unsigned int saved;
+
+	/* Quick test that store/show reports the same values */
+
+	igt_assert(igt_sysfs_scanf(engine, "preempt_timeout_ms", "%u", &saved) == 1);
+	igt_debug("Initial preempt_timeout_ms:%u\n", saved);
+
+	for (int i = 0; i < ARRAY_SIZE(delays); i++)
+		set_preempt_timeout(engine, delays[i]);
+
+	set_preempt_timeout(engine, saved);
+}
+
+static void test_invalid(int i915, int engine)
+{
+	unsigned int saved, delay;
+
+	/* Quick test that values that are not representable are rejected */
+
+	igt_assert(igt_sysfs_scanf(engine, "preempt_timeout_ms", "%u", &saved) == 1);
+	igt_debug("Initial preempt_timeout_ms:%u\n", saved);
+
+	igt_sysfs_printf(engine, "preempt_timeout_ms", PRIu64, -1);
+	igt_sysfs_scanf(engine, "preempt_timeout_ms", "%u", &delay);
+	igt_assert_eq(delay, saved);
+
+	igt_sysfs_printf(engine, "preempt_timeout_ms", "%d", -1);
+	igt_sysfs_scanf(engine, "preempt_timeout_ms", "%u", &delay);
+	igt_assert_eq(delay, saved);
+
+	igt_sysfs_printf(engine, "preempt_timeout_ms", PRIu64, 40ull << 32);
+	igt_sysfs_scanf(engine, "preempt_timeout_ms", "%u", &delay);
+	igt_assert_eq(delay, saved);
+}
+
+static void set_unbannable(int i915, uint32_t ctx)
+{
+	struct drm_i915_gem_context_param p = {
+		.ctx_id = ctx,
+		.param = I915_CONTEXT_PARAM_BANNABLE,
+	};
+
+	igt_assert_eq(__gem_context_set_param(i915, &p), 0);
+}
+
+static uint32_t create_context(int i915, unsigned int class, unsigned int inst, int prio)
+{
+	uint32_t ctx;
+
+	ctx = gem_context_create_for_engine(i915, class, inst);
+	set_unbannable(i915, ctx);
+	gem_context_set_priority(i915, ctx, prio);
+
+	return ctx;
+}
+
+static uint64_t __test_timeout(int i915, int engine, unsigned int timeout)
+{
+	unsigned int class, inst;
+	struct timespec ts = {};
+	igt_spin_t *spin[2];
+	uint64_t elapsed;
+	uint32_t ctx[2];
+
+	igt_assert(igt_sysfs_scanf(engine, "class", "%u", &class) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "instance", "%u", &inst) == 1);
+
+	set_preempt_timeout(engine, timeout);
+
+	ctx[0] = create_context(i915, class, inst, -1023);
+	spin[0] = igt_spin_new(i915, ctx[0],
+			       .flags = (IGT_SPIN_NO_PREEMPTION |
+					 IGT_SPIN_POLL_RUN |
+					 IGT_SPIN_FENCE_OUT));
+	igt_spin_busywait_until_started(spin[0]);
+
+	ctx[1] = create_context(i915, class, inst, 1023);
+	igt_nsec_elapsed(&ts);
+	spin[1] = igt_spin_new(i915, ctx[1], .flags = IGT_SPIN_POLL_RUN);
+	igt_spin_busywait_until_started(spin[1]);
+	elapsed = igt_nsec_elapsed(&ts);
+
+	igt_spin_free(i915, spin[1]);
+
+	igt_assert_eq(sync_fence_wait(spin[0]->out_fence, 1), 0);
+	igt_assert_eq(sync_fence_status(spin[0]->out_fence), -EIO);
+
+	igt_spin_free(i915, spin[0]);
+
+	gem_context_destroy(i915, ctx[1]);
+	gem_context_destroy(i915, ctx[0]);
+	gem_quiescent_gpu(i915);
+
+	return elapsed;
+}
+
+static void test_timeout(int i915, int engine)
+{
+	int delays[] = { 1, 50, 100, 500 };
+	unsigned int saved;
+
+	/*
+	 * Send down some non-preemptable workloads and then request a
+	 * switch to a higher priority context. The HW will not be able to
+	 * respond, so the kernel will be forced to reset the hog. This
+	 * timeout should match our specification, and so we can measure
+	 * the delay from requesting the preemption to its completion.
+	 */
+
+	igt_assert(igt_sysfs_scanf(engine, "preempt_timeout_ms", "%u", &saved) == 1);
+	igt_debug("Initial preempt_timeout_ms:%u\n", saved);
+
+	gem_quiescent_gpu(i915);
+	igt_require(enable_hangcheck(i915, false));
+
+	for (int i = 0; i < ARRAY_SIZE(delays); i++) {
+		uint64_t elapsed;
+
+		elapsed = __test_timeout(i915, engine, delays[i]);
+		igt_info("preempt_timeout_ms:%d, elapsed=%.3fms\n",
+			 delays[i], elapsed * 1e-6);
+
+		/*
+		 * We need to give a couple of jiffies slack for the scheduler timeouts
+		 * and then a little more slack fr the overhead in submitting and
+		 * measuring. 50ms should cover all of our sins and be useful
+		 * tolerance.
+		 */
+		igt_assert_f(elapsed / 1000 / 1000 < delays[i] + 50,
+			     "Forced preemption timeout exceeded request!\n");
+	}
+
+	igt_assert(enable_hangcheck(i915, true));
+	gem_quiescent_gpu(i915);
+	set_preempt_timeout(engine, saved);
+}
+
+static void test_off(int i915, int engine)
+{
+	unsigned int class, inst;
+	igt_spin_t *spin[2];
+	unsigned int saved;
+	uint32_t ctx[2];
+
+	/*
+	 * We support setting the timeout to 0 to disable the reset on
+	 * preemption failure. Having established that we can do forced
+	 * preemption on demand, we use the same setup (non-preeemptable hog
+	 * followed by a high priority context) and verify that the hog is
+	 * never reset. Never is a long time, so we settle for 150s.
+	 */
+
+	igt_assert(igt_sysfs_scanf(engine, "preempt_timeout_ms", "%u", &saved) == 1);
+	igt_debug("Initial preempt_timeout_ms:%u\n", saved);
+
+	gem_quiescent_gpu(i915);
+	igt_require(enable_hangcheck(i915, false));
+
+	igt_assert(igt_sysfs_scanf(engine, "class", "%u", &class) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "instance", "%u", &inst) == 1);
+
+	set_preempt_timeout(engine, 0);
+
+	ctx[0] = create_context(i915, class, inst, -1023);
+	spin[0] = igt_spin_new(i915, ctx[0],
+			       .flags = (IGT_SPIN_NO_PREEMPTION |
+					 IGT_SPIN_POLL_RUN |
+					 IGT_SPIN_FENCE_OUT));
+	igt_spin_busywait_until_started(spin[0]);
+
+	ctx[1] = create_context(i915, class, inst, 1023);
+	spin[1] = igt_spin_new(i915, ctx[1], .flags = IGT_SPIN_POLL_RUN);
+
+	for (int i = 0; i < 150; i++) {
+		igt_assert_eq(sync_fence_status(spin[0]->out_fence), 0);
+		sleep(1);
+	}
+
+	set_preempt_timeout(engine, 1);
+
+	igt_spin_busywait_until_started(spin[1]);
+	igt_spin_free(i915, spin[1]);
+
+	igt_assert_eq(sync_fence_wait(spin[0]->out_fence, 1), 0);
+	igt_assert_eq(sync_fence_status(spin[0]->out_fence), -EIO);
+
+	igt_spin_free(i915, spin[0]);
+
+	gem_context_destroy(i915, ctx[1]);
+	gem_context_destroy(i915, ctx[0]);
+
+	igt_assert(enable_hangcheck(i915, true));
+	gem_quiescent_gpu(i915);
+
+	set_preempt_timeout(engine, saved);
+}
+
+#if 0
+static void each_engines(int fd)
+{
+	struct dirent *de;
+	DIR *dir;
+
+	dir = fdopendir(fd);
+	while (dir && (de = readdir(dir))) {
+		int engine = openat(engines, de->d_name, O_RDONLY);
+		char *name;
+
+		name = igt_sysfs_get(engine, "name");
+		if (!name)
+			continue;
+
+		igt_subtest_group {
+			igt_fixture {
+				igt_require(fstatat(engine,
+							"preempt_timeout_ms",
+							&st, 0) == 0);
+			}
+		}
+	}
+	closedir(dir);
+}
+#endif
+
+igt_main
+{
+	const struct intel_execution_engine2 *it;
+	int i915 = -1, engines = -1;
+
+	igt_fixture {
+		int sys;
+
+		i915 = drm_open_driver(DRIVER_INTEL);
+		igt_require_gem(i915);
+
+		sys = igt_sysfs_open(i915);
+		igt_require(sys != -1);
+
+		engines = openat(sys, "engine", O_RDONLY);
+		igt_require(engines != -1);
+
+		close(sys);
+	}
+
+	__for_each_static_engine(it) {
+		igt_subtest_group {
+			int engine = -1;
+			char *name = NULL;
+
+			igt_fixture {
+				struct stat st;
+
+				engine = openat(engines, it->name, O_RDONLY);
+				igt_require(fstatat(engine,
+						    "preempt_timeout_ms",
+						    &st, 0) == 0);
+
+				name = igt_sysfs_get(engine, "name");
+			}
+			if (!name)
+				continue;
+
+			igt_subtest_f("%s-idempotent", name)
+				test_idempotent(i915, engine);
+			igt_subtest_f("%s-invalid", name)
+				test_invalid(i915, engine);
+			igt_subtest_f("%s-timeout", name)
+				test_timeout(i915, engine);
+			igt_subtest_f("%s-off", name)
+				test_off(i915, engine);
+
+			free(name);
+			close(engine);
+		}
+	}
+
+	igt_fixture {
+		close(engines);
+		close(i915);
+	}
+}
diff --git a/tests/meson.build b/tests/meson.build
index 3f3eee277..507434942 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -238,6 +238,7 @@ i915_progs = [
 	'i915_query',
 	'i915_selftest',
 	'i915_suspend',
+	'sysfs_preempt_timeout',
 ]
 
 test_deps = [ igt_deps ]
-- 
2.24.0.rc0

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^ permalink raw reply related	[flat|nested] 20+ messages in thread
* [PATCH i-g-t 7/9] i915: Exercise sysfs heartbeat controls
@ 2019-10-24 10:54   ` Chris Wilson
  0 siblings, 0 replies; 20+ messages in thread
From: Chris Wilson @ 2019-10-24 10:54 UTC (permalink / raw)
  To: intel-gfx

We [will] expose various per-engine scheduling controls. One of which,
'heartbeat_duration_ms', defines how often we send a heartbeat down the
engine to check upon the health of the engine. If a heartbeat does not
complete within the interval (or two), the engine is declared hung.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 tests/Makefile.sources                |   1 +
 tests/i915/sysfs_heartbeat_interval.c | 476 ++++++++++++++++++++++++++
 tests/meson.build                     |   1 +
 3 files changed, 478 insertions(+)
 create mode 100644 tests/i915/sysfs_heartbeat_interval.c

diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index c9901af18..74fd8be5b 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -98,6 +98,7 @@ TESTS_progs = \
 	tools_test \
 	vgem_basic \
 	vgem_slow \
+	i915/sysfs_heartbeat_interval \
 	i915/sysfs_preempt_timeout \
 	$(NULL)
 
diff --git a/tests/i915/sysfs_heartbeat_interval.c b/tests/i915/sysfs_heartbeat_interval.c
new file mode 100644
index 000000000..196076fd1
--- /dev/null
+++ b/tests/i915/sysfs_heartbeat_interval.c
@@ -0,0 +1,476 @@
+/*
+ * Copyright © 2019 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 <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <signal.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "drmtest.h" /* gem_quiescent_gpu()! */
+#include "i915/gem_engine_topology.h"
+#include "igt_dummyload.h"
+#include "igt_sysfs.h"
+#include "ioctl_wrappers.h" /* igt_require_gem()! */
+#include "sw_sync.h"
+
+#include "igt_debugfs.h"
+
+static bool __enable_hangcheck(int dir, bool state)
+{
+	return igt_sysfs_set(dir, "enable_hangcheck", state ? "1" : "0");
+}
+
+static void enable_hangcheck(int i915, bool state)
+{
+	int dir;
+
+	dir = igt_sysfs_open_parameters(i915);
+	if (dir < 0) /* no parameters, must be default! */
+		return;
+
+	__enable_hangcheck(dir, state);
+	close(dir);
+}
+
+static void set_heartbeat(int engine, unsigned int value)
+{
+	unsigned int delay = ~value;
+
+	igt_sysfs_printf(engine, "heartbeat_interval_ms", "%u", value);
+	igt_sysfs_scanf(engine, "heartbeat_interval_ms", "%u", &delay);
+	igt_assert_eq(delay, value);
+}
+
+static void test_idempotent(int i915, int engine)
+{
+	unsigned int delays[] = { 1, 1000, 5000, 50000, 123456789 };
+	unsigned int saved;
+
+	/* Quick test that the property reports the values we set */
+
+	igt_assert(igt_sysfs_scanf(engine, "heartbeat_interval_ms", "%u", &saved) == 1);
+	igt_debug("Initial heartbeat_interval_ms:%u\n", saved);
+
+	for (int i = 0; i < ARRAY_SIZE(delays); i++)
+		set_heartbeat(engine, delays[i]);
+
+	set_heartbeat(engine, saved);
+}
+
+static void test_invalid(int i915, int engine)
+{
+	unsigned int saved, delay;
+
+	/* Quick test that we reject any unrepresentable intervals */
+
+	igt_assert(igt_sysfs_scanf(engine, "heartbeat_interval_ms", "%u", &saved) == 1);
+	igt_debug("Initial heartbeat_interval_ms:%u\n", saved);
+
+	igt_sysfs_printf(engine, "heartbeat_interval_ms", PRIu64, -1);
+	igt_sysfs_scanf(engine, "heartbeat_interval_ms", "%u", &delay);
+	igt_assert_eq(delay, saved);
+
+	igt_sysfs_printf(engine, "heartbeat_interval_ms", PRIu64, 10ull << 32);
+	igt_sysfs_scanf(engine, "heartbeat_interval_ms", "%u", &delay);
+	igt_assert_eq(delay, saved);
+}
+
+static void set_unbannable(int i915, uint32_t ctx)
+{
+	struct drm_i915_gem_context_param p = {
+		.ctx_id = ctx,
+		.param = I915_CONTEXT_PARAM_BANNABLE,
+	};
+
+	igt_assert_eq(__gem_context_set_param(i915, &p), 0);
+}
+
+static uint32_t create_context(int i915, unsigned int class, unsigned int inst, int prio)
+{
+	uint32_t ctx;
+
+	ctx = gem_context_create_for_engine(i915, class, inst);
+	set_unbannable(i915, ctx);
+	gem_context_set_priority(i915, ctx, prio);
+
+	return ctx;
+}
+
+static uint64_t __test_timeout(int i915, int engine, unsigned int timeout)
+{
+	unsigned int class, inst;
+	struct timespec ts = {};
+	igt_spin_t *spin[2];
+	uint64_t elapsed;
+	uint32_t ctx[2];
+
+	igt_assert(igt_sysfs_scanf(engine, "class", "%u", &class) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "instance", "%u", &inst) == 1);
+
+	set_heartbeat(engine, timeout);
+
+	ctx[0] = create_context(i915, class, inst, 1023);
+	spin[0] = igt_spin_new(i915, ctx[0],
+			       .flags = (IGT_SPIN_NO_PREEMPTION |
+					 IGT_SPIN_POLL_RUN |
+					 IGT_SPIN_FENCE_OUT));
+	igt_spin_busywait_until_started(spin[0]);
+
+	ctx[1] = create_context(i915, class, inst, -1023);
+	igt_nsec_elapsed(&ts);
+	spin[1] = igt_spin_new(i915, ctx[1], .flags = IGT_SPIN_POLL_RUN);
+	igt_spin_busywait_until_started(spin[1]);
+	elapsed = igt_nsec_elapsed(&ts);
+
+	igt_spin_free(i915, spin[1]);
+
+	igt_assert_eq(sync_fence_wait(spin[0]->out_fence, 1), 0);
+	igt_assert_eq(sync_fence_status(spin[0]->out_fence), -EIO);
+
+	igt_spin_free(i915, spin[0]);
+
+	gem_context_destroy(i915, ctx[1]);
+	gem_context_destroy(i915, ctx[0]);
+	gem_quiescent_gpu(i915);
+
+	return elapsed;
+}
+
+static void test_precise(int i915, int engine)
+{
+	int delays[] = { 1, 50, 100, 500 };
+	unsigned int saved;
+
+	/*
+	 * The heartbeat interval defines how long the kernel waits between
+	 * checking on the status of the engines. It first sends down a
+	 * heartbeat pulse, waits the interval and sees if the system managed
+	 * to complete the pulse. If not, it gives a priority bump to the pulse
+	 * and waits again. This is repeated until the priority cannot be bumped
+	 * any more, and the system is declared hung.
+	 *
+	 * If we combine the preemptive pulse with forced preemption, we instead
+	 * get a much faster hang detection. Thus in combination we can measure
+	 * the system response time to reseting a hog as a measure of the
+	 * heartbeat interval, and so confirm it matches our specification.
+	 */
+
+	igt_require(igt_sysfs_printf(engine, "preempt_timeout_ms", "%u", 1) == 1);
+
+	igt_assert(igt_sysfs_scanf(engine, "heartbeat_interval_ms", "%u", &saved) == 1);
+	igt_debug("Initial heartbeat_interval_ms:%u\n", saved);
+	gem_quiescent_gpu(i915);
+
+	for (int i = 0; i < ARRAY_SIZE(delays); i++) {
+		uint64_t elapsed;
+
+		elapsed = __test_timeout(i915, engine, delays[i]);
+		igt_info("heartbeat_interval_ms:%d, elapsed=%.3fms[%d]\n",
+			 delays[i], elapsed * 1e-6,
+				(int)(elapsed / 1000 / 1000)
+			 );
+
+		/*
+		 * It takes a couple of missed heartbeats before we start
+		 * terminating hogs, and a little bit of jiffie slack for
+		 * scheduling at each step. 150ms should cover all of our
+		 * sins and be useful tolerance.
+		 */
+		igt_assert_f(elapsed / 1000 / 1000 < 3 * delays[i] + 150,
+			     "Heartbeat interval (and CPR) exceeded request!\n");
+	}
+
+	gem_quiescent_gpu(i915);
+	set_heartbeat(engine, saved);
+}
+
+static void test_nopreempt(int i915, int engine)
+{
+	int delays[] = { 1, 50, 100, 500 };
+	unsigned int saved;
+
+	/*
+	 * The same principle as test_precise(), except that forced preemption
+	 * is disabled (or simply not supported by the platform). This time,
+	 * it waits until the system misses a few heartbeat before doing a
+	 * per-engine/full-gpu reset. As such it is less precise, but we
+	 * can still estimate an upper bound for our specified heartbeat
+	 * interval and verify the system conforms.
+	 */
+
+	/* Test heartbeats with forced preemption  disabled */
+	igt_sysfs_printf(engine, "preempt_timeout_ms", "%u", 0);
+
+	igt_assert(igt_sysfs_scanf(engine, "heartbeat_interval_ms", "%u", &saved) == 1);
+	igt_debug("Initial heartbeat_interval_ms:%u\n", saved);
+	gem_quiescent_gpu(i915);
+
+	for (int i = 0; i < ARRAY_SIZE(delays); i++) {
+		uint64_t elapsed;
+
+		elapsed = __test_timeout(i915, engine, delays[i]);
+		igt_info("heartbeat_interval_ms:%d, elapsed=%.3fms[%d]\n",
+			 delays[i], elapsed * 1e-6,
+				(int)(elapsed / 1000 / 1000)
+			 );
+
+		/*
+		 * It takes a several missed heartbeats before we start
+		 * terminating hogs, and a little bit of jiffie slack for
+		 * scheduling at each step. 250ms should cover all of our
+		 * sins and be useful tolerance.
+		 */
+		igt_assert_f(elapsed / 1000 / 1000 < 5 * delays[i] + 150,
+			     "Heartbeat interval (and CPR) exceeded request!\n");
+	}
+
+	gem_quiescent_gpu(i915);
+	set_heartbeat(engine, saved);
+}
+
+static void client(int i915, int engine, int *ctl, int duration, int expect)
+{
+	unsigned int class, inst;
+	unsigned long count = 0;
+	uint32_t ctx;
+
+	igt_assert(igt_sysfs_scanf(engine, "class", "%u", &class) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "instance", "%u", &inst) == 1);
+
+	ctx = create_context(i915, class, inst, 0);
+
+	while (!READ_ONCE(*ctl)) {
+		igt_spin_t *spin;
+
+		spin = igt_spin_new(i915, ctx,
+				    .flags = (IGT_SPIN_NO_PREEMPTION |
+					      IGT_SPIN_POLL_RUN |
+					      IGT_SPIN_FENCE_OUT));
+		igt_spin_busywait_until_started(spin);
+
+		igt_spin_set_timeout(spin, (uint64_t)duration * 1000 * 1000);
+		sync_fence_wait(spin->out_fence, -1);
+
+		igt_assert_eq(sync_fence_status(spin->out_fence), expect);
+		count++;
+	}
+
+	gem_context_destroy(i915, ctx);
+	igt_info("%s client completed %lu spins\n",
+		 expect < 0 ? "Bad" : "Good", count);
+}
+
+static void sigign(int sig)
+{
+}
+
+static void wait_until(int duration)
+{
+	signal(SIGCHLD, sigign);
+	sleep(duration);
+	signal(SIGCHLD, SIG_IGN);
+}
+
+static void __test_mixed(int i915, int engine,
+			 int heartbeat,
+			 int good,
+			 int bad,
+			 int duration)
+{
+	unsigned int saved;
+	int *shared;
+
+	/*
+	 * Given two clients of which one is a hog, be sure we cleanly
+	 * terminate the hog leaving the good client to run.
+	 */
+
+	igt_assert(igt_sysfs_scanf(engine, "heartbeat_interval_ms", "%u", &saved) == 1);
+	igt_debug("Initial heartbeat_interval_ms:%u\n", saved);
+	gem_quiescent_gpu(i915);
+
+	shared = mmap(NULL, 4096, PROT_WRITE, MAP_SHARED | MAP_ANON, -1, 0);
+	igt_assert(shared != MAP_FAILED);
+
+	set_heartbeat(engine, heartbeat);
+
+	igt_fork(child, 1) /* good client */
+		client(i915, engine, shared, good, 1);
+	igt_fork(child, 1) /* bad client */
+		client(i915, engine, shared, bad, -EIO);
+
+	wait_until(duration);
+
+	*shared = true;
+	igt_waitchildren();
+	munmap(shared, 4096);
+
+	gem_quiescent_gpu(i915);
+	set_heartbeat(engine, saved);
+}
+
+static void test_mixed(int i915, int engine)
+{
+	/*
+	 * Hogs rarely run alone. Our hang detection must carefully wean
+	 * out the hogs from the innocent clients. Thus we run a mixed workload
+	 * with non-preemptable hogs that exceed the heartbeat, and quicker
+	 * innocents. We inspect the fence status of each to verify that
+	 * only the hogs are reset.
+	 */
+	igt_sysfs_printf(engine, "preempt_timeout_ms", "%u", 1);
+	__test_mixed(i915, engine, 10, 10, 100, 5);
+}
+
+static void test_long(int i915, int engine)
+{
+	/*
+	 * Some clients relish being hogs, and demand that the system
+	 * never do hangchecking. Never is hard to test, so instead we
+	 * run over a day and verify that only the super hogs are reset.
+	 */
+	igt_sysfs_printf(engine, "preempt_timeout_ms", "%u", 0);
+	__test_mixed(i915, engine,
+		     60 * 1000, /* 60s */
+		     60 * 1000, /* 60s */
+		     300 * 1000, /* 5min */
+		     24 * 3600 /* 24hours */);
+}
+
+static void test_off(int i915, int engine)
+{
+	unsigned int class, inst;
+	unsigned int saved;
+	igt_spin_t *spin;
+	uint32_t ctx;
+
+	/*
+	 * Some other clients request that there is never any interruption
+	 * or jitter in their workload and so demand that the kernel never
+	 * sends a heartbeat to steal precious cycles from their workload.
+	 * Turn off the heartbeat and check that the workload is uninterrupted
+	 * for 150s.
+	 */
+
+	igt_assert(igt_sysfs_scanf(engine, "heartbeat_interval_ms", "%u", &saved) == 1);
+	igt_debug("Initial heartbeat_interval_ms:%u\n", saved);
+	gem_quiescent_gpu(i915);
+
+	igt_assert(igt_sysfs_scanf(engine, "class", "%u", &class) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "instance", "%u", &inst) == 1);
+
+	set_heartbeat(engine, 0);
+
+	ctx = create_context(i915, class, inst, 0);
+
+	spin = igt_spin_new(i915, ctx,
+			    .flags = (IGT_SPIN_POLL_RUN |
+				      IGT_SPIN_NO_PREEMPTION |
+				      IGT_SPIN_FENCE_OUT));
+	igt_spin_busywait_until_started(spin);
+
+	for (int i = 0; i < 150; i++) {
+		igt_assert_eq(sync_fence_status(spin->out_fence), 0);
+		sleep(1);
+	}
+
+	set_heartbeat(engine, 1);
+
+	igt_assert_eq(sync_fence_wait(spin->out_fence, 250), 0);
+	igt_assert_eq(sync_fence_status(spin->out_fence), -EIO);
+
+	igt_spin_free(i915, spin);
+
+	gem_quiescent_gpu(i915);
+	set_heartbeat(engine, saved);
+}
+
+igt_main
+{
+	const struct intel_execution_engine2 *it;
+	int i915 = -1, engines = -1;
+
+	igt_fixture {
+		int sys;
+
+		i915 = drm_open_driver(DRIVER_INTEL);
+		igt_require_gem(i915);
+
+		sys = igt_sysfs_open(i915);
+		igt_require(sys != -1);
+
+		engines = openat(sys, "engine", O_RDONLY);
+		igt_require(engines != -1);
+		close(sys);
+
+		enable_hangcheck(i915, true);
+	}
+
+	__for_each_static_engine(it) {
+		igt_subtest_group {
+			int engine = -1;
+			char *name = NULL;
+
+			igt_fixture {
+				struct stat st;
+
+				engine = openat(engines, it->name, O_RDONLY);
+				igt_require(fstatat(engine,
+						    "heartbeat_interval_ms",
+						    &st, 0) == 0);
+				name = igt_sysfs_get(engine, "name");
+			}
+			if (!name)
+				continue;
+
+			igt_subtest_f("%s-idempotent", name)
+				test_idempotent(i915, engine);
+			igt_subtest_f("%s-invalid", name)
+				test_invalid(i915, engine);
+
+			igt_subtest_f("%s-precise", name)
+				test_precise(i915, engine);
+			igt_subtest_f("%s-nopreempt", name)
+				test_nopreempt(i915, engine);
+			igt_subtest_f("%s-mixed", name)
+				test_mixed(i915, engine);
+			igt_subtest_f("%s-off", name)
+				test_off(i915, engine);
+			igt_subtest_f("%s-long", name)
+				test_long(i915, engine);
+
+			free(name);
+			close(engine);
+		}
+	}
+
+	igt_fixture {
+		close(engines);
+		close(i915);
+	}
+}
diff --git a/tests/meson.build b/tests/meson.build
index 507434942..9eeab530d 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -238,6 +238,7 @@ i915_progs = [
 	'i915_query',
 	'i915_selftest',
 	'i915_suspend',
+	'sysfs_heartbeat_interval',
 	'sysfs_preempt_timeout',
 ]
 
-- 
2.24.0.rc0

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^ permalink raw reply related	[flat|nested] 20+ messages in thread
* [Intel-gfx] [PATCH i-g-t 7/9] i915: Exercise sysfs heartbeat controls
@ 2019-10-24 10:54   ` Chris Wilson
  0 siblings, 0 replies; 20+ messages in thread
From: Chris Wilson @ 2019-10-24 10:54 UTC (permalink / raw)
  To: intel-gfx

We [will] expose various per-engine scheduling controls. One of which,
'heartbeat_duration_ms', defines how often we send a heartbeat down the
engine to check upon the health of the engine. If a heartbeat does not
complete within the interval (or two), the engine is declared hung.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 tests/Makefile.sources                |   1 +
 tests/i915/sysfs_heartbeat_interval.c | 476 ++++++++++++++++++++++++++
 tests/meson.build                     |   1 +
 3 files changed, 478 insertions(+)
 create mode 100644 tests/i915/sysfs_heartbeat_interval.c

diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index c9901af18..74fd8be5b 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -98,6 +98,7 @@ TESTS_progs = \
 	tools_test \
 	vgem_basic \
 	vgem_slow \
+	i915/sysfs_heartbeat_interval \
 	i915/sysfs_preempt_timeout \
 	$(NULL)
 
diff --git a/tests/i915/sysfs_heartbeat_interval.c b/tests/i915/sysfs_heartbeat_interval.c
new file mode 100644
index 000000000..196076fd1
--- /dev/null
+++ b/tests/i915/sysfs_heartbeat_interval.c
@@ -0,0 +1,476 @@
+/*
+ * Copyright © 2019 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 <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <signal.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "drmtest.h" /* gem_quiescent_gpu()! */
+#include "i915/gem_engine_topology.h"
+#include "igt_dummyload.h"
+#include "igt_sysfs.h"
+#include "ioctl_wrappers.h" /* igt_require_gem()! */
+#include "sw_sync.h"
+
+#include "igt_debugfs.h"
+
+static bool __enable_hangcheck(int dir, bool state)
+{
+	return igt_sysfs_set(dir, "enable_hangcheck", state ? "1" : "0");
+}
+
+static void enable_hangcheck(int i915, bool state)
+{
+	int dir;
+
+	dir = igt_sysfs_open_parameters(i915);
+	if (dir < 0) /* no parameters, must be default! */
+		return;
+
+	__enable_hangcheck(dir, state);
+	close(dir);
+}
+
+static void set_heartbeat(int engine, unsigned int value)
+{
+	unsigned int delay = ~value;
+
+	igt_sysfs_printf(engine, "heartbeat_interval_ms", "%u", value);
+	igt_sysfs_scanf(engine, "heartbeat_interval_ms", "%u", &delay);
+	igt_assert_eq(delay, value);
+}
+
+static void test_idempotent(int i915, int engine)
+{
+	unsigned int delays[] = { 1, 1000, 5000, 50000, 123456789 };
+	unsigned int saved;
+
+	/* Quick test that the property reports the values we set */
+
+	igt_assert(igt_sysfs_scanf(engine, "heartbeat_interval_ms", "%u", &saved) == 1);
+	igt_debug("Initial heartbeat_interval_ms:%u\n", saved);
+
+	for (int i = 0; i < ARRAY_SIZE(delays); i++)
+		set_heartbeat(engine, delays[i]);
+
+	set_heartbeat(engine, saved);
+}
+
+static void test_invalid(int i915, int engine)
+{
+	unsigned int saved, delay;
+
+	/* Quick test that we reject any unrepresentable intervals */
+
+	igt_assert(igt_sysfs_scanf(engine, "heartbeat_interval_ms", "%u", &saved) == 1);
+	igt_debug("Initial heartbeat_interval_ms:%u\n", saved);
+
+	igt_sysfs_printf(engine, "heartbeat_interval_ms", PRIu64, -1);
+	igt_sysfs_scanf(engine, "heartbeat_interval_ms", "%u", &delay);
+	igt_assert_eq(delay, saved);
+
+	igt_sysfs_printf(engine, "heartbeat_interval_ms", PRIu64, 10ull << 32);
+	igt_sysfs_scanf(engine, "heartbeat_interval_ms", "%u", &delay);
+	igt_assert_eq(delay, saved);
+}
+
+static void set_unbannable(int i915, uint32_t ctx)
+{
+	struct drm_i915_gem_context_param p = {
+		.ctx_id = ctx,
+		.param = I915_CONTEXT_PARAM_BANNABLE,
+	};
+
+	igt_assert_eq(__gem_context_set_param(i915, &p), 0);
+}
+
+static uint32_t create_context(int i915, unsigned int class, unsigned int inst, int prio)
+{
+	uint32_t ctx;
+
+	ctx = gem_context_create_for_engine(i915, class, inst);
+	set_unbannable(i915, ctx);
+	gem_context_set_priority(i915, ctx, prio);
+
+	return ctx;
+}
+
+static uint64_t __test_timeout(int i915, int engine, unsigned int timeout)
+{
+	unsigned int class, inst;
+	struct timespec ts = {};
+	igt_spin_t *spin[2];
+	uint64_t elapsed;
+	uint32_t ctx[2];
+
+	igt_assert(igt_sysfs_scanf(engine, "class", "%u", &class) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "instance", "%u", &inst) == 1);
+
+	set_heartbeat(engine, timeout);
+
+	ctx[0] = create_context(i915, class, inst, 1023);
+	spin[0] = igt_spin_new(i915, ctx[0],
+			       .flags = (IGT_SPIN_NO_PREEMPTION |
+					 IGT_SPIN_POLL_RUN |
+					 IGT_SPIN_FENCE_OUT));
+	igt_spin_busywait_until_started(spin[0]);
+
+	ctx[1] = create_context(i915, class, inst, -1023);
+	igt_nsec_elapsed(&ts);
+	spin[1] = igt_spin_new(i915, ctx[1], .flags = IGT_SPIN_POLL_RUN);
+	igt_spin_busywait_until_started(spin[1]);
+	elapsed = igt_nsec_elapsed(&ts);
+
+	igt_spin_free(i915, spin[1]);
+
+	igt_assert_eq(sync_fence_wait(spin[0]->out_fence, 1), 0);
+	igt_assert_eq(sync_fence_status(spin[0]->out_fence), -EIO);
+
+	igt_spin_free(i915, spin[0]);
+
+	gem_context_destroy(i915, ctx[1]);
+	gem_context_destroy(i915, ctx[0]);
+	gem_quiescent_gpu(i915);
+
+	return elapsed;
+}
+
+static void test_precise(int i915, int engine)
+{
+	int delays[] = { 1, 50, 100, 500 };
+	unsigned int saved;
+
+	/*
+	 * The heartbeat interval defines how long the kernel waits between
+	 * checking on the status of the engines. It first sends down a
+	 * heartbeat pulse, waits the interval and sees if the system managed
+	 * to complete the pulse. If not, it gives a priority bump to the pulse
+	 * and waits again. This is repeated until the priority cannot be bumped
+	 * any more, and the system is declared hung.
+	 *
+	 * If we combine the preemptive pulse with forced preemption, we instead
+	 * get a much faster hang detection. Thus in combination we can measure
+	 * the system response time to reseting a hog as a measure of the
+	 * heartbeat interval, and so confirm it matches our specification.
+	 */
+
+	igt_require(igt_sysfs_printf(engine, "preempt_timeout_ms", "%u", 1) == 1);
+
+	igt_assert(igt_sysfs_scanf(engine, "heartbeat_interval_ms", "%u", &saved) == 1);
+	igt_debug("Initial heartbeat_interval_ms:%u\n", saved);
+	gem_quiescent_gpu(i915);
+
+	for (int i = 0; i < ARRAY_SIZE(delays); i++) {
+		uint64_t elapsed;
+
+		elapsed = __test_timeout(i915, engine, delays[i]);
+		igt_info("heartbeat_interval_ms:%d, elapsed=%.3fms[%d]\n",
+			 delays[i], elapsed * 1e-6,
+				(int)(elapsed / 1000 / 1000)
+			 );
+
+		/*
+		 * It takes a couple of missed heartbeats before we start
+		 * terminating hogs, and a little bit of jiffie slack for
+		 * scheduling at each step. 150ms should cover all of our
+		 * sins and be useful tolerance.
+		 */
+		igt_assert_f(elapsed / 1000 / 1000 < 3 * delays[i] + 150,
+			     "Heartbeat interval (and CPR) exceeded request!\n");
+	}
+
+	gem_quiescent_gpu(i915);
+	set_heartbeat(engine, saved);
+}
+
+static void test_nopreempt(int i915, int engine)
+{
+	int delays[] = { 1, 50, 100, 500 };
+	unsigned int saved;
+
+	/*
+	 * The same principle as test_precise(), except that forced preemption
+	 * is disabled (or simply not supported by the platform). This time,
+	 * it waits until the system misses a few heartbeat before doing a
+	 * per-engine/full-gpu reset. As such it is less precise, but we
+	 * can still estimate an upper bound for our specified heartbeat
+	 * interval and verify the system conforms.
+	 */
+
+	/* Test heartbeats with forced preemption  disabled */
+	igt_sysfs_printf(engine, "preempt_timeout_ms", "%u", 0);
+
+	igt_assert(igt_sysfs_scanf(engine, "heartbeat_interval_ms", "%u", &saved) == 1);
+	igt_debug("Initial heartbeat_interval_ms:%u\n", saved);
+	gem_quiescent_gpu(i915);
+
+	for (int i = 0; i < ARRAY_SIZE(delays); i++) {
+		uint64_t elapsed;
+
+		elapsed = __test_timeout(i915, engine, delays[i]);
+		igt_info("heartbeat_interval_ms:%d, elapsed=%.3fms[%d]\n",
+			 delays[i], elapsed * 1e-6,
+				(int)(elapsed / 1000 / 1000)
+			 );
+
+		/*
+		 * It takes a several missed heartbeats before we start
+		 * terminating hogs, and a little bit of jiffie slack for
+		 * scheduling at each step. 250ms should cover all of our
+		 * sins and be useful tolerance.
+		 */
+		igt_assert_f(elapsed / 1000 / 1000 < 5 * delays[i] + 150,
+			     "Heartbeat interval (and CPR) exceeded request!\n");
+	}
+
+	gem_quiescent_gpu(i915);
+	set_heartbeat(engine, saved);
+}
+
+static void client(int i915, int engine, int *ctl, int duration, int expect)
+{
+	unsigned int class, inst;
+	unsigned long count = 0;
+	uint32_t ctx;
+
+	igt_assert(igt_sysfs_scanf(engine, "class", "%u", &class) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "instance", "%u", &inst) == 1);
+
+	ctx = create_context(i915, class, inst, 0);
+
+	while (!READ_ONCE(*ctl)) {
+		igt_spin_t *spin;
+
+		spin = igt_spin_new(i915, ctx,
+				    .flags = (IGT_SPIN_NO_PREEMPTION |
+					      IGT_SPIN_POLL_RUN |
+					      IGT_SPIN_FENCE_OUT));
+		igt_spin_busywait_until_started(spin);
+
+		igt_spin_set_timeout(spin, (uint64_t)duration * 1000 * 1000);
+		sync_fence_wait(spin->out_fence, -1);
+
+		igt_assert_eq(sync_fence_status(spin->out_fence), expect);
+		count++;
+	}
+
+	gem_context_destroy(i915, ctx);
+	igt_info("%s client completed %lu spins\n",
+		 expect < 0 ? "Bad" : "Good", count);
+}
+
+static void sigign(int sig)
+{
+}
+
+static void wait_until(int duration)
+{
+	signal(SIGCHLD, sigign);
+	sleep(duration);
+	signal(SIGCHLD, SIG_IGN);
+}
+
+static void __test_mixed(int i915, int engine,
+			 int heartbeat,
+			 int good,
+			 int bad,
+			 int duration)
+{
+	unsigned int saved;
+	int *shared;
+
+	/*
+	 * Given two clients of which one is a hog, be sure we cleanly
+	 * terminate the hog leaving the good client to run.
+	 */
+
+	igt_assert(igt_sysfs_scanf(engine, "heartbeat_interval_ms", "%u", &saved) == 1);
+	igt_debug("Initial heartbeat_interval_ms:%u\n", saved);
+	gem_quiescent_gpu(i915);
+
+	shared = mmap(NULL, 4096, PROT_WRITE, MAP_SHARED | MAP_ANON, -1, 0);
+	igt_assert(shared != MAP_FAILED);
+
+	set_heartbeat(engine, heartbeat);
+
+	igt_fork(child, 1) /* good client */
+		client(i915, engine, shared, good, 1);
+	igt_fork(child, 1) /* bad client */
+		client(i915, engine, shared, bad, -EIO);
+
+	wait_until(duration);
+
+	*shared = true;
+	igt_waitchildren();
+	munmap(shared, 4096);
+
+	gem_quiescent_gpu(i915);
+	set_heartbeat(engine, saved);
+}
+
+static void test_mixed(int i915, int engine)
+{
+	/*
+	 * Hogs rarely run alone. Our hang detection must carefully wean
+	 * out the hogs from the innocent clients. Thus we run a mixed workload
+	 * with non-preemptable hogs that exceed the heartbeat, and quicker
+	 * innocents. We inspect the fence status of each to verify that
+	 * only the hogs are reset.
+	 */
+	igt_sysfs_printf(engine, "preempt_timeout_ms", "%u", 1);
+	__test_mixed(i915, engine, 10, 10, 100, 5);
+}
+
+static void test_long(int i915, int engine)
+{
+	/*
+	 * Some clients relish being hogs, and demand that the system
+	 * never do hangchecking. Never is hard to test, so instead we
+	 * run over a day and verify that only the super hogs are reset.
+	 */
+	igt_sysfs_printf(engine, "preempt_timeout_ms", "%u", 0);
+	__test_mixed(i915, engine,
+		     60 * 1000, /* 60s */
+		     60 * 1000, /* 60s */
+		     300 * 1000, /* 5min */
+		     24 * 3600 /* 24hours */);
+}
+
+static void test_off(int i915, int engine)
+{
+	unsigned int class, inst;
+	unsigned int saved;
+	igt_spin_t *spin;
+	uint32_t ctx;
+
+	/*
+	 * Some other clients request that there is never any interruption
+	 * or jitter in their workload and so demand that the kernel never
+	 * sends a heartbeat to steal precious cycles from their workload.
+	 * Turn off the heartbeat and check that the workload is uninterrupted
+	 * for 150s.
+	 */
+
+	igt_assert(igt_sysfs_scanf(engine, "heartbeat_interval_ms", "%u", &saved) == 1);
+	igt_debug("Initial heartbeat_interval_ms:%u\n", saved);
+	gem_quiescent_gpu(i915);
+
+	igt_assert(igt_sysfs_scanf(engine, "class", "%u", &class) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "instance", "%u", &inst) == 1);
+
+	set_heartbeat(engine, 0);
+
+	ctx = create_context(i915, class, inst, 0);
+
+	spin = igt_spin_new(i915, ctx,
+			    .flags = (IGT_SPIN_POLL_RUN |
+				      IGT_SPIN_NO_PREEMPTION |
+				      IGT_SPIN_FENCE_OUT));
+	igt_spin_busywait_until_started(spin);
+
+	for (int i = 0; i < 150; i++) {
+		igt_assert_eq(sync_fence_status(spin->out_fence), 0);
+		sleep(1);
+	}
+
+	set_heartbeat(engine, 1);
+
+	igt_assert_eq(sync_fence_wait(spin->out_fence, 250), 0);
+	igt_assert_eq(sync_fence_status(spin->out_fence), -EIO);
+
+	igt_spin_free(i915, spin);
+
+	gem_quiescent_gpu(i915);
+	set_heartbeat(engine, saved);
+}
+
+igt_main
+{
+	const struct intel_execution_engine2 *it;
+	int i915 = -1, engines = -1;
+
+	igt_fixture {
+		int sys;
+
+		i915 = drm_open_driver(DRIVER_INTEL);
+		igt_require_gem(i915);
+
+		sys = igt_sysfs_open(i915);
+		igt_require(sys != -1);
+
+		engines = openat(sys, "engine", O_RDONLY);
+		igt_require(engines != -1);
+		close(sys);
+
+		enable_hangcheck(i915, true);
+	}
+
+	__for_each_static_engine(it) {
+		igt_subtest_group {
+			int engine = -1;
+			char *name = NULL;
+
+			igt_fixture {
+				struct stat st;
+
+				engine = openat(engines, it->name, O_RDONLY);
+				igt_require(fstatat(engine,
+						    "heartbeat_interval_ms",
+						    &st, 0) == 0);
+				name = igt_sysfs_get(engine, "name");
+			}
+			if (!name)
+				continue;
+
+			igt_subtest_f("%s-idempotent", name)
+				test_idempotent(i915, engine);
+			igt_subtest_f("%s-invalid", name)
+				test_invalid(i915, engine);
+
+			igt_subtest_f("%s-precise", name)
+				test_precise(i915, engine);
+			igt_subtest_f("%s-nopreempt", name)
+				test_nopreempt(i915, engine);
+			igt_subtest_f("%s-mixed", name)
+				test_mixed(i915, engine);
+			igt_subtest_f("%s-off", name)
+				test_off(i915, engine);
+			igt_subtest_f("%s-long", name)
+				test_long(i915, engine);
+
+			free(name);
+			close(engine);
+		}
+	}
+
+	igt_fixture {
+		close(engines);
+		close(i915);
+	}
+}
diff --git a/tests/meson.build b/tests/meson.build
index 507434942..9eeab530d 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -238,6 +238,7 @@ i915_progs = [
 	'i915_query',
 	'i915_selftest',
 	'i915_suspend',
+	'sysfs_heartbeat_interval',
 	'sysfs_preempt_timeout',
 ]
 
-- 
2.24.0.rc0

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^ permalink raw reply related	[flat|nested] 20+ messages in thread
* [PATCH i-g-t 8/9] i915: Exercise timeslice sysfs property
@ 2019-10-24 10:54   ` Chris Wilson
  0 siblings, 0 replies; 20+ messages in thread
From: Chris Wilson @ 2019-10-24 10:54 UTC (permalink / raw)
  To: intel-gfx

We [will] expose various per-engine scheduling controls. One of which,
'timeslice_duration_ms', defines the scheduling quantum. If a context
exhausts its timeslice, it will be preempted in favour of running one of
its compatriots.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 tests/Makefile.sources                |   1 +
 tests/i915/sysfs_timeslice_duration.c | 517 ++++++++++++++++++++++++++
 tests/meson.build                     |   1 +
 3 files changed, 519 insertions(+)
 create mode 100644 tests/i915/sysfs_timeslice_duration.c

diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index 74fd8be5b..b22d63265 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -100,6 +100,7 @@ TESTS_progs = \
 	vgem_slow \
 	i915/sysfs_heartbeat_interval \
 	i915/sysfs_preempt_timeout \
+	i915/sysfs_timeslice_duration \
 	$(NULL)
 
 TESTS_progs += gem_bad_reloc
diff --git a/tests/i915/sysfs_timeslice_duration.c b/tests/i915/sysfs_timeslice_duration.c
new file mode 100644
index 000000000..f10b3a839
--- /dev/null
+++ b/tests/i915/sysfs_timeslice_duration.c
@@ -0,0 +1,517 @@
+/*
+ * Copyright © 2019 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 <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "drmtest.h" /* gem_quiescent_gpu()! */
+#include "i915/gem_engine_topology.h"
+#include "i915/gem_mman.h"
+#include "igt_dummyload.h"
+#include "igt_sysfs.h"
+#include "ioctl_wrappers.h" /* igt_require_gem()! */
+#include "intel_chipset.h"
+#include "intel_reg.h"
+#include "sw_sync.h"
+
+#define MI_SEMAPHORE_WAIT		(0x1c << 23)
+#define   MI_SEMAPHORE_POLL             (1 << 15)
+#define   MI_SEMAPHORE_SAD_GT_SDD       (0 << 12)
+#define   MI_SEMAPHORE_SAD_GTE_SDD      (1 << 12)
+#define   MI_SEMAPHORE_SAD_LT_SDD       (2 << 12)
+#define   MI_SEMAPHORE_SAD_LTE_SDD      (3 << 12)
+#define   MI_SEMAPHORE_SAD_EQ_SDD       (4 << 12)
+#define   MI_SEMAPHORE_SAD_NEQ_SDD      (5 << 12)
+
+static bool __enable_hangcheck(int dir, bool state)
+{
+	return igt_sysfs_set(dir, "enable_hangcheck", state ? "1" : "0");
+}
+
+static bool enable_hangcheck(int i915, bool state)
+{
+	bool success;
+	int dir;
+
+	dir = igt_sysfs_open_parameters(i915);
+	if (dir < 0) /* no parameters, must be default! */
+		return false;
+
+	success = __enable_hangcheck(dir, state);
+	close(dir);
+
+	return success;
+}
+
+static void set_timeslice(int engine, unsigned int value)
+{
+	unsigned int delay;
+
+	igt_sysfs_printf(engine, "timeslice_duration_ms", "%u", value);
+	igt_sysfs_scanf(engine, "timeslice_duration_ms", "%u", &delay);
+	igt_assert_eq(delay, value);
+}
+
+static void test_idempotent(int i915, int engine)
+{
+	const unsigned int delays[] = { 0, 1, 1234, 654321 };
+	unsigned int saved;
+
+	/* Quick test to verify the kernel reports the same values as we write */
+
+	igt_assert(igt_sysfs_scanf(engine, "timeslice_duration_ms", "%u", &saved) == 1);
+	igt_debug("Initial timeslice_duration_ms:%u\n", saved);
+
+	for (int i = 0; i < ARRAY_SIZE(delays); i++)
+		set_timeslice(engine, delays[i]);
+
+	set_timeslice(engine, saved);
+}
+
+static void test_invalid(int i915, int engine)
+{
+	unsigned int saved, delay;
+
+	/* Quick test that non-representable delays are rejected */
+
+	igt_assert(igt_sysfs_scanf(engine, "timeslice_duration_ms", "%u", &saved) == 1);
+	igt_debug("Initial timeslice_duration_ms:%u\n", saved);
+
+	igt_sysfs_printf(engine, "timeslice_duration_ms", PRIu64, -1);
+	igt_sysfs_scanf(engine, "timeslice_duration_ms", "%u", &delay);
+	igt_assert_eq(delay, saved);
+
+	igt_sysfs_printf(engine, "timeslice_duration_ms", "%d", -1);
+	igt_sysfs_scanf(engine, "timeslice_duration_ms", "%u", &delay);
+	igt_assert_eq(delay, saved);
+
+	igt_sysfs_printf(engine, "timeslice_duration_ms", PRIu64, 123ull << 32);
+	igt_sysfs_scanf(engine, "timeslice_duration_ms", "%u", &delay);
+	igt_assert_eq(delay, saved);
+}
+
+static void set_unbannable(int i915, uint32_t ctx)
+{
+	struct drm_i915_gem_context_param p = {
+		.ctx_id = ctx,
+		.param = I915_CONTEXT_PARAM_BANNABLE,
+	};
+
+	igt_assert_eq(__gem_context_set_param(i915, &p), 0);
+}
+
+static uint32_t create_context(int i915, unsigned int class, unsigned int inst, int prio)
+{
+	uint32_t ctx;
+
+	ctx = gem_context_create_for_engine(i915, class, inst);
+	set_unbannable(i915, ctx);
+	gem_context_set_priority(i915, ctx, prio);
+
+	return ctx;
+}
+
+static int cmp_u32(const void *_a, const void *_b)
+{
+	const uint32_t *a = _a, *b = _b;
+
+	return *a - *b;
+}
+
+static double clockrate(int i915)
+{
+	int freq;
+	drm_i915_getparam_t gp = {
+		.value = &freq,
+		.param = I915_PARAM_CS_TIMESTAMP_FREQUENCY,
+	};
+
+	igt_require(igt_ioctl(i915, DRM_IOCTL_I915_GETPARAM, &gp) == 0);
+	return 1e9 / freq;
+}
+
+static uint64_t __test_duration(int i915, int engine, unsigned int timeout)
+{
+	struct drm_i915_gem_exec_object2 obj[3] = {
+		{
+			.handle = gem_create(i915, 4096),
+			.offset = 0,
+			.flags = EXEC_OBJECT_PINNED,
+		},
+		{
+			.handle = gem_create(i915, 4096),
+			.offset = 4096,
+			.flags = EXEC_OBJECT_PINNED,
+		},
+		{ gem_create(i915, 4096) }
+	};
+	struct drm_i915_gem_execbuffer2 eb = {
+		.buffer_count = ARRAY_SIZE(obj),
+		.buffers_ptr = to_user_pointer(obj),
+	};
+	const int gen = intel_gen(intel_get_drm_devid(i915));
+	double duration = clockrate(i915);
+	unsigned int class, inst, mmio;
+	uint32_t *cs, *map;
+	uint32_t ctx[2];
+	int start;
+	int i;
+
+	igt_require(gem_scheduler_has_preemption(i915));
+	igt_require(gen >= 8); /* MI_SEMAPHORE_WAIT */
+
+	igt_assert(igt_sysfs_scanf(engine, "class", "%u", &class) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "instance", "%u", &inst) == 1);
+	igt_require(igt_sysfs_scanf(engine, "mmio_base", "%x", &mmio) == 1);
+
+	set_timeslice(engine, timeout);
+
+	ctx[0] = create_context(i915, class, inst, 0);
+	ctx[1] = create_context(i915, class, inst, 0);
+
+	map = gem_mmap__cpu(i915, obj[2].handle, 0, 4096, PROT_WRITE);
+
+	cs = map;
+	for (i = 0; i < 10; i++) {
+		*cs++ = MI_SEMAPHORE_WAIT |
+			MI_SEMAPHORE_POLL |
+			MI_SEMAPHORE_SAD_NEQ_SDD |
+			(4 - 2 + (gen >= 12));
+		*cs++ = 0;
+		*cs++ = obj[0].offset + sizeof(uint32_t) * i;
+		*cs++ = 0;
+		if (gen >= 12)
+			*cs++ = 0;
+
+		*cs++ = 0x24 << 23 | 2; /* SRM */
+		*cs++ = mmio + 0x358;
+		*cs++ = obj[1].offset + sizeof(uint32_t) * i;
+		*cs++ = 0;
+
+		*cs++ = MI_STORE_DWORD_IMM;
+		*cs++ = obj[0].offset +
+			4096 - sizeof(uint32_t) * i - sizeof(uint32_t);
+		*cs++ = 0;
+		*cs++ = 1;
+	}
+	*cs++ = MI_BATCH_BUFFER_END;
+
+	cs += 16 - ((cs - map) & 15);
+	start = (cs - map) * sizeof(*cs);
+	for (i = 0; i < 10; i++) {
+		*cs++ = MI_STORE_DWORD_IMM;
+		*cs++ = obj[0].offset + sizeof(uint32_t) * i;
+		*cs++ = 0;
+		*cs++ = 1;
+
+		*cs++ = MI_SEMAPHORE_WAIT |
+			MI_SEMAPHORE_POLL |
+			MI_SEMAPHORE_SAD_NEQ_SDD |
+			(4 - 2 + (gen >= 12));
+		*cs++ = 0;
+		*cs++ = obj[0].offset +
+			4096 - sizeof(uint32_t) * i - sizeof(uint32_t);
+		*cs++ = 0;
+		if (gen >= 12)
+			*cs++ = 0;
+	}
+	*cs++ = MI_BATCH_BUFFER_END;
+	igt_assert(cs - map < 4096 / sizeof(*cs));
+	munmap(map, 4096);
+
+	eb.rsvd1 = ctx[0];
+	gem_execbuf(i915, &eb);
+
+	eb.rsvd1 = ctx[1];
+	eb.batch_start_offset = start;
+	gem_execbuf(i915, &eb);
+
+	gem_sync(i915, obj[2].handle);
+
+	gem_set_domain(i915, obj[1].handle,
+		       I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
+	map = gem_mmap__cpu(i915, obj[1].handle, 0, 4096, PROT_WRITE);
+	for (i = 0; i < 9; i++)
+		map[i] = map[i + 1] - map[i];
+	qsort(map, 9, sizeof(*map), cmp_u32);
+	duration *= map[4] / 2; /* 2 sema-waits between timestamp updates */
+	munmap(map, 4096);
+
+	for (i = 0; i < ARRAY_SIZE(ctx); i++)
+		gem_context_destroy(i915, ctx[i]);
+
+	for (i = 0; i < ARRAY_SIZE(obj); i++)
+		gem_close(i915, obj[i].handle);
+
+	return duration;
+}
+
+static void test_duration(int i915, int engine)
+{
+	int delays[] = { 1, 50, 100, 500 };
+	unsigned int saved;
+
+	/*
+	 * Timeslicing at its very basic level is sharing the GPU by
+	 * running one context for interval before running another. After
+	 * each interval the running context is swapped for another runnable
+	 * context.
+	 *
+	 * We can measure this directly by watching the xCS_TIMESTAMP and
+	 * recording its value every time we switch into the context, using
+	 * a couple of semaphores to busyspin for the timeslice.
+	 */
+
+	igt_assert(igt_sysfs_scanf(engine, "timeslice_duration_ms", "%u", &saved) == 1);
+	igt_debug("Initial timeslice_duration_ms:%u\n", saved);
+
+	gem_quiescent_gpu(i915);
+
+	for (int i = 0; i < ARRAY_SIZE(delays); i++) {
+		uint64_t elapsed;
+
+		elapsed = __test_duration(i915, engine, delays[i]);
+		igt_info("timeslice_duration_ms:%d, elapsed=%.3fms\n",
+			 delays[i], elapsed * 1e-6);
+
+		/*
+		 * We need to give a couple of jiffies slack for the scheduler timeouts
+		 * and then a little more slack fr the overhead in submitting and
+		 * measuring. 50ms should cover all of our sins and be useful
+		 * tolerance.
+		 */
+		igt_assert_f(elapsed / 1000 / 1000 < delays[i] + 50,
+			     "Timeslice exceeded request!\n");
+	}
+
+	gem_quiescent_gpu(i915);
+	set_timeslice(engine, saved);
+}
+
+static uint64_t __test_timeout(int i915, int engine, unsigned int timeout)
+{
+	unsigned int class, inst;
+	struct timespec ts = {};
+	igt_spin_t *spin[2];
+	uint64_t elapsed;
+	uint32_t ctx[2];
+
+	igt_assert(igt_sysfs_scanf(engine, "class", "%u", &class) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "instance", "%u", &inst) == 1);
+
+	set_timeslice(engine, timeout);
+
+	ctx[0] = create_context(i915, class, inst, 0);
+	spin[0] = igt_spin_new(i915, ctx[0],
+			       .flags = (IGT_SPIN_NO_PREEMPTION |
+					 IGT_SPIN_POLL_RUN |
+					 IGT_SPIN_FENCE_OUT));
+	igt_spin_busywait_until_started(spin[0]);
+
+	ctx[1] = create_context(i915, class, inst, 0);
+	igt_nsec_elapsed(&ts);
+	spin[1] = igt_spin_new(i915, ctx[1], .flags = IGT_SPIN_POLL_RUN);
+	igt_spin_busywait_until_started(spin[1]);
+	elapsed = igt_nsec_elapsed(&ts);
+
+	igt_spin_free(i915, spin[1]);
+
+	igt_assert_eq(sync_fence_wait(spin[0]->out_fence, 1), 0);
+	igt_assert_eq(sync_fence_status(spin[0]->out_fence), -EIO);
+
+	igt_spin_free(i915, spin[0]);
+
+	gem_context_destroy(i915, ctx[1]);
+	gem_context_destroy(i915, ctx[0]);
+	gem_quiescent_gpu(i915);
+
+	return elapsed;
+}
+
+static void test_timeout(int i915, int engine)
+{
+	int delays[] = { 1, 50, 100, 500 };
+	unsigned int saved;
+
+	/*
+	 * Timeslicing requires us to preempt the running context in order to
+	 * switch into its contemporary. If we couple a unpreemptable hog
+	 * with a fast forced reset, we can measure the timeslice by how long
+	 * it takes for the hog to be reset and the high priority context
+	 * to complete.
+	 */
+
+	igt_require(igt_sysfs_printf(engine, "preempt_timeout_ms", "%u", 1) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "timeslice_duration_ms", "%u", &saved) == 1);
+	igt_debug("Initial timeslice_duration_ms:%u\n", saved);
+
+	gem_quiescent_gpu(i915);
+	igt_require(enable_hangcheck(i915, false));
+
+	for (int i = 0; i < ARRAY_SIZE(delays); i++) {
+		uint64_t elapsed;
+
+		elapsed = __test_timeout(i915, engine, delays[i]);
+		igt_info("timeslice_duration_ms:%d, elapsed=%.3fms\n",
+			 delays[i], elapsed * 1e-6);
+
+		/*
+		 * We need to give a couple of jiffies slack for the scheduler timeouts
+		 * and then a little more slack fr the overhead in submitting and
+		 * measuring. 50ms should cover all of our sins and be useful
+		 * tolerance.
+		 */
+		igt_assert_f(elapsed / 1000 / 1000 < delays[i] + 50,
+			     "Timeslice exceeded request!\n");
+	}
+
+	igt_assert(enable_hangcheck(i915, true));
+	gem_quiescent_gpu(i915);
+	set_timeslice(engine, saved);
+}
+
+static void test_off(int i915, int engine)
+{
+	unsigned int class, inst;
+	unsigned int saved;
+	igt_spin_t *spin[2];
+	uint32_t ctx[2];
+
+	/*
+	 * As always, there are some who must run uninterrupted and simply do
+	 * not want to share the GPU even for a microsecond. Those greedy
+	 * clients can disable timeslicing entirely, and so set the timeslice
+	 * to 0. We test that a hog is not preempted within the 150s of
+	 * our boredom threshold.
+	 */
+
+	igt_require(igt_sysfs_printf(engine, "preempt_timeout_ms", "%u", 1) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "timeslice_duration_ms", "%u", &saved) == 1);
+	igt_debug("Initial timeslice_duration_ms:%u\n", saved);
+
+	gem_quiescent_gpu(i915);
+	igt_require(enable_hangcheck(i915, false));
+
+	igt_assert(igt_sysfs_scanf(engine, "class", "%u", &class) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "instance", "%u", &inst) == 1);
+
+	set_timeslice(engine, 0);
+
+	ctx[0] = create_context(i915, class, inst, 0);
+	spin[0] = igt_spin_new(i915, ctx[0],
+			       .flags = (IGT_SPIN_NO_PREEMPTION |
+					 IGT_SPIN_POLL_RUN |
+					 IGT_SPIN_FENCE_OUT));
+	igt_spin_busywait_until_started(spin[0]);
+
+	ctx[1] = create_context(i915, class, inst, 0);
+	spin[1] = igt_spin_new(i915, ctx[1], .flags = IGT_SPIN_POLL_RUN);
+
+	for (int i = 0; i < 150; i++) {
+		igt_assert_eq(sync_fence_status(spin[0]->out_fence), 0);
+		sleep(1);
+	}
+
+	set_timeslice(engine, 1);
+
+	igt_spin_busywait_until_started(spin[1]);
+	igt_spin_free(i915, spin[1]);
+
+	igt_assert_eq(sync_fence_wait(spin[0]->out_fence, 1), 0);
+	igt_assert_eq(sync_fence_status(spin[0]->out_fence), -EIO);
+
+	igt_spin_free(i915, spin[0]);
+
+	gem_context_destroy(i915, ctx[1]);
+	gem_context_destroy(i915, ctx[0]);
+
+	igt_assert(enable_hangcheck(i915, true));
+	gem_quiescent_gpu(i915);
+
+	set_timeslice(engine, saved);
+}
+
+igt_main
+{
+	const struct intel_execution_engine2 *it;
+	int i915 = -1, engines = -1;
+
+	igt_fixture {
+		int sys;
+
+		i915 = drm_open_driver(DRIVER_INTEL);
+		igt_require_gem(i915);
+
+		sys = igt_sysfs_open(i915);
+		igt_require(sys != -1);
+
+		engines = openat(sys, "engine", O_RDONLY);
+		igt_require(engines != -1);
+
+		close(sys);
+	}
+
+	__for_each_static_engine(it) {
+		igt_subtest_group {
+			int engine = -1;
+			char *name = NULL;
+
+			igt_fixture {
+				struct stat st;
+
+				engine = openat(engines, it->name, O_RDONLY);
+				igt_require(fstatat(engine,
+							"timeslice_duration_ms",
+							&st, 0) == 0);
+
+				name = igt_sysfs_get(engine, "name");
+			}
+			if (!name)
+				continue;
+
+			igt_subtest_f("%s-idempotent", name)
+				test_idempotent(i915, engine);
+			igt_subtest_f("%s-invalid", name)
+				test_invalid(i915, engine);
+			igt_subtest_f("%s-duration", name)
+				test_duration(i915, engine);
+			igt_subtest_f("%s-timeout", name)
+				test_timeout(i915, engine);
+			igt_subtest_f("%s-off", name)
+				test_off(i915, engine);
+
+			free(name);
+			close(engine);
+		}
+	}
+
+	igt_fixture {
+		close(engines);
+		close(i915);
+	}
+}
diff --git a/tests/meson.build b/tests/meson.build
index 9eeab530d..f151c0a5e 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -240,6 +240,7 @@ i915_progs = [
 	'i915_suspend',
 	'sysfs_heartbeat_interval',
 	'sysfs_preempt_timeout',
+	'sysfs_timeslice_duration',
 ]
 
 test_deps = [ igt_deps ]
-- 
2.24.0.rc0

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^ permalink raw reply related	[flat|nested] 20+ messages in thread
* [Intel-gfx] [PATCH i-g-t 8/9] i915: Exercise timeslice sysfs property
@ 2019-10-24 10:54   ` Chris Wilson
  0 siblings, 0 replies; 20+ messages in thread
From: Chris Wilson @ 2019-10-24 10:54 UTC (permalink / raw)
  To: intel-gfx

We [will] expose various per-engine scheduling controls. One of which,
'timeslice_duration_ms', defines the scheduling quantum. If a context
exhausts its timeslice, it will be preempted in favour of running one of
its compatriots.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 tests/Makefile.sources                |   1 +
 tests/i915/sysfs_timeslice_duration.c | 517 ++++++++++++++++++++++++++
 tests/meson.build                     |   1 +
 3 files changed, 519 insertions(+)
 create mode 100644 tests/i915/sysfs_timeslice_duration.c

diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index 74fd8be5b..b22d63265 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -100,6 +100,7 @@ TESTS_progs = \
 	vgem_slow \
 	i915/sysfs_heartbeat_interval \
 	i915/sysfs_preempt_timeout \
+	i915/sysfs_timeslice_duration \
 	$(NULL)
 
 TESTS_progs += gem_bad_reloc
diff --git a/tests/i915/sysfs_timeslice_duration.c b/tests/i915/sysfs_timeslice_duration.c
new file mode 100644
index 000000000..f10b3a839
--- /dev/null
+++ b/tests/i915/sysfs_timeslice_duration.c
@@ -0,0 +1,517 @@
+/*
+ * Copyright © 2019 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 <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "drmtest.h" /* gem_quiescent_gpu()! */
+#include "i915/gem_engine_topology.h"
+#include "i915/gem_mman.h"
+#include "igt_dummyload.h"
+#include "igt_sysfs.h"
+#include "ioctl_wrappers.h" /* igt_require_gem()! */
+#include "intel_chipset.h"
+#include "intel_reg.h"
+#include "sw_sync.h"
+
+#define MI_SEMAPHORE_WAIT		(0x1c << 23)
+#define   MI_SEMAPHORE_POLL             (1 << 15)
+#define   MI_SEMAPHORE_SAD_GT_SDD       (0 << 12)
+#define   MI_SEMAPHORE_SAD_GTE_SDD      (1 << 12)
+#define   MI_SEMAPHORE_SAD_LT_SDD       (2 << 12)
+#define   MI_SEMAPHORE_SAD_LTE_SDD      (3 << 12)
+#define   MI_SEMAPHORE_SAD_EQ_SDD       (4 << 12)
+#define   MI_SEMAPHORE_SAD_NEQ_SDD      (5 << 12)
+
+static bool __enable_hangcheck(int dir, bool state)
+{
+	return igt_sysfs_set(dir, "enable_hangcheck", state ? "1" : "0");
+}
+
+static bool enable_hangcheck(int i915, bool state)
+{
+	bool success;
+	int dir;
+
+	dir = igt_sysfs_open_parameters(i915);
+	if (dir < 0) /* no parameters, must be default! */
+		return false;
+
+	success = __enable_hangcheck(dir, state);
+	close(dir);
+
+	return success;
+}
+
+static void set_timeslice(int engine, unsigned int value)
+{
+	unsigned int delay;
+
+	igt_sysfs_printf(engine, "timeslice_duration_ms", "%u", value);
+	igt_sysfs_scanf(engine, "timeslice_duration_ms", "%u", &delay);
+	igt_assert_eq(delay, value);
+}
+
+static void test_idempotent(int i915, int engine)
+{
+	const unsigned int delays[] = { 0, 1, 1234, 654321 };
+	unsigned int saved;
+
+	/* Quick test to verify the kernel reports the same values as we write */
+
+	igt_assert(igt_sysfs_scanf(engine, "timeslice_duration_ms", "%u", &saved) == 1);
+	igt_debug("Initial timeslice_duration_ms:%u\n", saved);
+
+	for (int i = 0; i < ARRAY_SIZE(delays); i++)
+		set_timeslice(engine, delays[i]);
+
+	set_timeslice(engine, saved);
+}
+
+static void test_invalid(int i915, int engine)
+{
+	unsigned int saved, delay;
+
+	/* Quick test that non-representable delays are rejected */
+
+	igt_assert(igt_sysfs_scanf(engine, "timeslice_duration_ms", "%u", &saved) == 1);
+	igt_debug("Initial timeslice_duration_ms:%u\n", saved);
+
+	igt_sysfs_printf(engine, "timeslice_duration_ms", PRIu64, -1);
+	igt_sysfs_scanf(engine, "timeslice_duration_ms", "%u", &delay);
+	igt_assert_eq(delay, saved);
+
+	igt_sysfs_printf(engine, "timeslice_duration_ms", "%d", -1);
+	igt_sysfs_scanf(engine, "timeslice_duration_ms", "%u", &delay);
+	igt_assert_eq(delay, saved);
+
+	igt_sysfs_printf(engine, "timeslice_duration_ms", PRIu64, 123ull << 32);
+	igt_sysfs_scanf(engine, "timeslice_duration_ms", "%u", &delay);
+	igt_assert_eq(delay, saved);
+}
+
+static void set_unbannable(int i915, uint32_t ctx)
+{
+	struct drm_i915_gem_context_param p = {
+		.ctx_id = ctx,
+		.param = I915_CONTEXT_PARAM_BANNABLE,
+	};
+
+	igt_assert_eq(__gem_context_set_param(i915, &p), 0);
+}
+
+static uint32_t create_context(int i915, unsigned int class, unsigned int inst, int prio)
+{
+	uint32_t ctx;
+
+	ctx = gem_context_create_for_engine(i915, class, inst);
+	set_unbannable(i915, ctx);
+	gem_context_set_priority(i915, ctx, prio);
+
+	return ctx;
+}
+
+static int cmp_u32(const void *_a, const void *_b)
+{
+	const uint32_t *a = _a, *b = _b;
+
+	return *a - *b;
+}
+
+static double clockrate(int i915)
+{
+	int freq;
+	drm_i915_getparam_t gp = {
+		.value = &freq,
+		.param = I915_PARAM_CS_TIMESTAMP_FREQUENCY,
+	};
+
+	igt_require(igt_ioctl(i915, DRM_IOCTL_I915_GETPARAM, &gp) == 0);
+	return 1e9 / freq;
+}
+
+static uint64_t __test_duration(int i915, int engine, unsigned int timeout)
+{
+	struct drm_i915_gem_exec_object2 obj[3] = {
+		{
+			.handle = gem_create(i915, 4096),
+			.offset = 0,
+			.flags = EXEC_OBJECT_PINNED,
+		},
+		{
+			.handle = gem_create(i915, 4096),
+			.offset = 4096,
+			.flags = EXEC_OBJECT_PINNED,
+		},
+		{ gem_create(i915, 4096) }
+	};
+	struct drm_i915_gem_execbuffer2 eb = {
+		.buffer_count = ARRAY_SIZE(obj),
+		.buffers_ptr = to_user_pointer(obj),
+	};
+	const int gen = intel_gen(intel_get_drm_devid(i915));
+	double duration = clockrate(i915);
+	unsigned int class, inst, mmio;
+	uint32_t *cs, *map;
+	uint32_t ctx[2];
+	int start;
+	int i;
+
+	igt_require(gem_scheduler_has_preemption(i915));
+	igt_require(gen >= 8); /* MI_SEMAPHORE_WAIT */
+
+	igt_assert(igt_sysfs_scanf(engine, "class", "%u", &class) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "instance", "%u", &inst) == 1);
+	igt_require(igt_sysfs_scanf(engine, "mmio_base", "%x", &mmio) == 1);
+
+	set_timeslice(engine, timeout);
+
+	ctx[0] = create_context(i915, class, inst, 0);
+	ctx[1] = create_context(i915, class, inst, 0);
+
+	map = gem_mmap__cpu(i915, obj[2].handle, 0, 4096, PROT_WRITE);
+
+	cs = map;
+	for (i = 0; i < 10; i++) {
+		*cs++ = MI_SEMAPHORE_WAIT |
+			MI_SEMAPHORE_POLL |
+			MI_SEMAPHORE_SAD_NEQ_SDD |
+			(4 - 2 + (gen >= 12));
+		*cs++ = 0;
+		*cs++ = obj[0].offset + sizeof(uint32_t) * i;
+		*cs++ = 0;
+		if (gen >= 12)
+			*cs++ = 0;
+
+		*cs++ = 0x24 << 23 | 2; /* SRM */
+		*cs++ = mmio + 0x358;
+		*cs++ = obj[1].offset + sizeof(uint32_t) * i;
+		*cs++ = 0;
+
+		*cs++ = MI_STORE_DWORD_IMM;
+		*cs++ = obj[0].offset +
+			4096 - sizeof(uint32_t) * i - sizeof(uint32_t);
+		*cs++ = 0;
+		*cs++ = 1;
+	}
+	*cs++ = MI_BATCH_BUFFER_END;
+
+	cs += 16 - ((cs - map) & 15);
+	start = (cs - map) * sizeof(*cs);
+	for (i = 0; i < 10; i++) {
+		*cs++ = MI_STORE_DWORD_IMM;
+		*cs++ = obj[0].offset + sizeof(uint32_t) * i;
+		*cs++ = 0;
+		*cs++ = 1;
+
+		*cs++ = MI_SEMAPHORE_WAIT |
+			MI_SEMAPHORE_POLL |
+			MI_SEMAPHORE_SAD_NEQ_SDD |
+			(4 - 2 + (gen >= 12));
+		*cs++ = 0;
+		*cs++ = obj[0].offset +
+			4096 - sizeof(uint32_t) * i - sizeof(uint32_t);
+		*cs++ = 0;
+		if (gen >= 12)
+			*cs++ = 0;
+	}
+	*cs++ = MI_BATCH_BUFFER_END;
+	igt_assert(cs - map < 4096 / sizeof(*cs));
+	munmap(map, 4096);
+
+	eb.rsvd1 = ctx[0];
+	gem_execbuf(i915, &eb);
+
+	eb.rsvd1 = ctx[1];
+	eb.batch_start_offset = start;
+	gem_execbuf(i915, &eb);
+
+	gem_sync(i915, obj[2].handle);
+
+	gem_set_domain(i915, obj[1].handle,
+		       I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
+	map = gem_mmap__cpu(i915, obj[1].handle, 0, 4096, PROT_WRITE);
+	for (i = 0; i < 9; i++)
+		map[i] = map[i + 1] - map[i];
+	qsort(map, 9, sizeof(*map), cmp_u32);
+	duration *= map[4] / 2; /* 2 sema-waits between timestamp updates */
+	munmap(map, 4096);
+
+	for (i = 0; i < ARRAY_SIZE(ctx); i++)
+		gem_context_destroy(i915, ctx[i]);
+
+	for (i = 0; i < ARRAY_SIZE(obj); i++)
+		gem_close(i915, obj[i].handle);
+
+	return duration;
+}
+
+static void test_duration(int i915, int engine)
+{
+	int delays[] = { 1, 50, 100, 500 };
+	unsigned int saved;
+
+	/*
+	 * Timeslicing at its very basic level is sharing the GPU by
+	 * running one context for interval before running another. After
+	 * each interval the running context is swapped for another runnable
+	 * context.
+	 *
+	 * We can measure this directly by watching the xCS_TIMESTAMP and
+	 * recording its value every time we switch into the context, using
+	 * a couple of semaphores to busyspin for the timeslice.
+	 */
+
+	igt_assert(igt_sysfs_scanf(engine, "timeslice_duration_ms", "%u", &saved) == 1);
+	igt_debug("Initial timeslice_duration_ms:%u\n", saved);
+
+	gem_quiescent_gpu(i915);
+
+	for (int i = 0; i < ARRAY_SIZE(delays); i++) {
+		uint64_t elapsed;
+
+		elapsed = __test_duration(i915, engine, delays[i]);
+		igt_info("timeslice_duration_ms:%d, elapsed=%.3fms\n",
+			 delays[i], elapsed * 1e-6);
+
+		/*
+		 * We need to give a couple of jiffies slack for the scheduler timeouts
+		 * and then a little more slack fr the overhead in submitting and
+		 * measuring. 50ms should cover all of our sins and be useful
+		 * tolerance.
+		 */
+		igt_assert_f(elapsed / 1000 / 1000 < delays[i] + 50,
+			     "Timeslice exceeded request!\n");
+	}
+
+	gem_quiescent_gpu(i915);
+	set_timeslice(engine, saved);
+}
+
+static uint64_t __test_timeout(int i915, int engine, unsigned int timeout)
+{
+	unsigned int class, inst;
+	struct timespec ts = {};
+	igt_spin_t *spin[2];
+	uint64_t elapsed;
+	uint32_t ctx[2];
+
+	igt_assert(igt_sysfs_scanf(engine, "class", "%u", &class) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "instance", "%u", &inst) == 1);
+
+	set_timeslice(engine, timeout);
+
+	ctx[0] = create_context(i915, class, inst, 0);
+	spin[0] = igt_spin_new(i915, ctx[0],
+			       .flags = (IGT_SPIN_NO_PREEMPTION |
+					 IGT_SPIN_POLL_RUN |
+					 IGT_SPIN_FENCE_OUT));
+	igt_spin_busywait_until_started(spin[0]);
+
+	ctx[1] = create_context(i915, class, inst, 0);
+	igt_nsec_elapsed(&ts);
+	spin[1] = igt_spin_new(i915, ctx[1], .flags = IGT_SPIN_POLL_RUN);
+	igt_spin_busywait_until_started(spin[1]);
+	elapsed = igt_nsec_elapsed(&ts);
+
+	igt_spin_free(i915, spin[1]);
+
+	igt_assert_eq(sync_fence_wait(spin[0]->out_fence, 1), 0);
+	igt_assert_eq(sync_fence_status(spin[0]->out_fence), -EIO);
+
+	igt_spin_free(i915, spin[0]);
+
+	gem_context_destroy(i915, ctx[1]);
+	gem_context_destroy(i915, ctx[0]);
+	gem_quiescent_gpu(i915);
+
+	return elapsed;
+}
+
+static void test_timeout(int i915, int engine)
+{
+	int delays[] = { 1, 50, 100, 500 };
+	unsigned int saved;
+
+	/*
+	 * Timeslicing requires us to preempt the running context in order to
+	 * switch into its contemporary. If we couple a unpreemptable hog
+	 * with a fast forced reset, we can measure the timeslice by how long
+	 * it takes for the hog to be reset and the high priority context
+	 * to complete.
+	 */
+
+	igt_require(igt_sysfs_printf(engine, "preempt_timeout_ms", "%u", 1) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "timeslice_duration_ms", "%u", &saved) == 1);
+	igt_debug("Initial timeslice_duration_ms:%u\n", saved);
+
+	gem_quiescent_gpu(i915);
+	igt_require(enable_hangcheck(i915, false));
+
+	for (int i = 0; i < ARRAY_SIZE(delays); i++) {
+		uint64_t elapsed;
+
+		elapsed = __test_timeout(i915, engine, delays[i]);
+		igt_info("timeslice_duration_ms:%d, elapsed=%.3fms\n",
+			 delays[i], elapsed * 1e-6);
+
+		/*
+		 * We need to give a couple of jiffies slack for the scheduler timeouts
+		 * and then a little more slack fr the overhead in submitting and
+		 * measuring. 50ms should cover all of our sins and be useful
+		 * tolerance.
+		 */
+		igt_assert_f(elapsed / 1000 / 1000 < delays[i] + 50,
+			     "Timeslice exceeded request!\n");
+	}
+
+	igt_assert(enable_hangcheck(i915, true));
+	gem_quiescent_gpu(i915);
+	set_timeslice(engine, saved);
+}
+
+static void test_off(int i915, int engine)
+{
+	unsigned int class, inst;
+	unsigned int saved;
+	igt_spin_t *spin[2];
+	uint32_t ctx[2];
+
+	/*
+	 * As always, there are some who must run uninterrupted and simply do
+	 * not want to share the GPU even for a microsecond. Those greedy
+	 * clients can disable timeslicing entirely, and so set the timeslice
+	 * to 0. We test that a hog is not preempted within the 150s of
+	 * our boredom threshold.
+	 */
+
+	igt_require(igt_sysfs_printf(engine, "preempt_timeout_ms", "%u", 1) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "timeslice_duration_ms", "%u", &saved) == 1);
+	igt_debug("Initial timeslice_duration_ms:%u\n", saved);
+
+	gem_quiescent_gpu(i915);
+	igt_require(enable_hangcheck(i915, false));
+
+	igt_assert(igt_sysfs_scanf(engine, "class", "%u", &class) == 1);
+	igt_assert(igt_sysfs_scanf(engine, "instance", "%u", &inst) == 1);
+
+	set_timeslice(engine, 0);
+
+	ctx[0] = create_context(i915, class, inst, 0);
+	spin[0] = igt_spin_new(i915, ctx[0],
+			       .flags = (IGT_SPIN_NO_PREEMPTION |
+					 IGT_SPIN_POLL_RUN |
+					 IGT_SPIN_FENCE_OUT));
+	igt_spin_busywait_until_started(spin[0]);
+
+	ctx[1] = create_context(i915, class, inst, 0);
+	spin[1] = igt_spin_new(i915, ctx[1], .flags = IGT_SPIN_POLL_RUN);
+
+	for (int i = 0; i < 150; i++) {
+		igt_assert_eq(sync_fence_status(spin[0]->out_fence), 0);
+		sleep(1);
+	}
+
+	set_timeslice(engine, 1);
+
+	igt_spin_busywait_until_started(spin[1]);
+	igt_spin_free(i915, spin[1]);
+
+	igt_assert_eq(sync_fence_wait(spin[0]->out_fence, 1), 0);
+	igt_assert_eq(sync_fence_status(spin[0]->out_fence), -EIO);
+
+	igt_spin_free(i915, spin[0]);
+
+	gem_context_destroy(i915, ctx[1]);
+	gem_context_destroy(i915, ctx[0]);
+
+	igt_assert(enable_hangcheck(i915, true));
+	gem_quiescent_gpu(i915);
+
+	set_timeslice(engine, saved);
+}
+
+igt_main
+{
+	const struct intel_execution_engine2 *it;
+	int i915 = -1, engines = -1;
+
+	igt_fixture {
+		int sys;
+
+		i915 = drm_open_driver(DRIVER_INTEL);
+		igt_require_gem(i915);
+
+		sys = igt_sysfs_open(i915);
+		igt_require(sys != -1);
+
+		engines = openat(sys, "engine", O_RDONLY);
+		igt_require(engines != -1);
+
+		close(sys);
+	}
+
+	__for_each_static_engine(it) {
+		igt_subtest_group {
+			int engine = -1;
+			char *name = NULL;
+
+			igt_fixture {
+				struct stat st;
+
+				engine = openat(engines, it->name, O_RDONLY);
+				igt_require(fstatat(engine,
+							"timeslice_duration_ms",
+							&st, 0) == 0);
+
+				name = igt_sysfs_get(engine, "name");
+			}
+			if (!name)
+				continue;
+
+			igt_subtest_f("%s-idempotent", name)
+				test_idempotent(i915, engine);
+			igt_subtest_f("%s-invalid", name)
+				test_invalid(i915, engine);
+			igt_subtest_f("%s-duration", name)
+				test_duration(i915, engine);
+			igt_subtest_f("%s-timeout", name)
+				test_timeout(i915, engine);
+			igt_subtest_f("%s-off", name)
+				test_off(i915, engine);
+
+			free(name);
+			close(engine);
+		}
+	}
+
+	igt_fixture {
+		close(engines);
+		close(i915);
+	}
+}
diff --git a/tests/meson.build b/tests/meson.build
index 9eeab530d..f151c0a5e 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -240,6 +240,7 @@ i915_progs = [
 	'i915_suspend',
 	'sysfs_heartbeat_interval',
 	'sysfs_preempt_timeout',
+	'sysfs_timeslice_duration',
 ]
 
 test_deps = [ igt_deps ]
-- 
2.24.0.rc0

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^ permalink raw reply related	[flat|nested] 20+ messages in thread
* [PATCH i-g-t 9/9] i915: Exercise I915_CONTEXT_PARAM_RINGSIZE
@ 2019-10-24 10:54   ` Chris Wilson
  0 siblings, 0 replies; 20+ messages in thread
From: Chris Wilson @ 2019-10-24 10:54 UTC (permalink / raw)
  To: intel-gfx

I915_CONTEXT_PARAM_RINGSIZE specifies how large to create the command
ringbuffer for logical ring contects. This directly affects the number
of batches userspace can submit before blocking waiting for space.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 tests/Makefile.sources        |   3 +
 tests/i915/gem_ctx_ringsize.c | 296 ++++++++++++++++++++++++++++++++++
 tests/meson.build             |   1 +
 3 files changed, 300 insertions(+)
 create mode 100644 tests/i915/gem_ctx_ringsize.c

diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index b22d63265..eb802d189 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -160,6 +160,9 @@ gem_ctx_param_SOURCES = i915/gem_ctx_param.c
 TESTS_progs += gem_ctx_persistence
 gem_ctx_persistence_SOURCES = i915/gem_ctx_persistence.c
 
+TESTS_progs += gem_ctx_ringsize
+gem_ctx_ringsize_SOURCES = i915/gem_ctx_ringsize.c
+
 TESTS_progs += gem_ctx_shared
 gem_ctx_shared_SOURCES = i915/gem_ctx_shared.c
 
diff --git a/tests/i915/gem_ctx_ringsize.c b/tests/i915/gem_ctx_ringsize.c
new file mode 100644
index 000000000..1450e8f0d
--- /dev/null
+++ b/tests/i915/gem_ctx_ringsize.c
@@ -0,0 +1,296 @@
+/*
+ * Copyright © 2019 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 <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "drmtest.h" /* gem_quiescent_gpu()! */
+#include "i915/gem_context.h"
+#include "i915/gem_engine_topology.h"
+#include "ioctl_wrappers.h" /* gem_wait()! */
+#include "sw_sync.h"
+
+#define I915_CONTEXT_PARAM_RINGSIZE 0xc
+
+static bool has_ringsize(int i915)
+{
+	struct drm_i915_gem_context_param p = {
+		.param = I915_CONTEXT_PARAM_RINGSIZE,
+	};
+
+	return __gem_context_get_param(i915, &p) == 0;
+}
+
+static void test_idempotent(int i915)
+{
+	struct drm_i915_gem_context_param p = {
+		.param = I915_CONTEXT_PARAM_RINGSIZE,
+	};
+	uint32_t saved;
+
+	/*
+	 * Simple test to verify that we are able to read back the same
+	 * value as we set.
+	 */
+
+	gem_context_get_param(i915, &p);
+	saved = p.value;
+
+	for (uint32_t x = 1 << 12; x <= 128 << 12; x <<= 1) {
+		p.value = x;
+		gem_context_set_param(i915, &p);
+		gem_context_get_param(i915, &p);
+		igt_assert_eq_u32(p.value, x);
+	}
+
+	p.value = saved;
+	gem_context_set_param(i915, &p);
+}
+
+static void test_invalid(int i915)
+{
+	struct drm_i915_gem_context_param p = {
+		.param = I915_CONTEXT_PARAM_RINGSIZE,
+	};
+	uint64_t invalid[] = {
+		0, 1, 4095, 4097, 8191, 8193,
+		/* upper limit may be HW dependent, atm it is 512KiB */
+		(512 << 10) - 1, (512 << 10) + 1,
+		-1, -1u
+	};
+	uint32_t saved;
+
+	gem_context_get_param(i915, &p);
+	saved = p.value;
+
+	for (int i = 0; i < ARRAY_SIZE(invalid); i++) {
+		p.value = invalid[i];
+		igt_assert_eq(__gem_context_set_param(i915, &p), -EINVAL);
+		gem_context_get_param(i915, &p);
+		igt_assert_eq_u64(p.value, saved);
+	}
+}
+
+static int create_ext_ioctl(int i915,
+			    struct drm_i915_gem_context_create_ext *arg)
+{
+	int err;
+
+	err = 0;
+	if (igt_ioctl(i915, DRM_IOCTL_I915_GEM_CONTEXT_CREATE_EXT, arg)) {
+		err = -errno;
+		igt_assume(err);
+	}
+
+	errno = 0;
+	return err;
+}
+
+static void test_create(int i915)
+{
+	struct drm_i915_gem_context_create_ext_setparam p = {
+		.base = {
+			.name = I915_CONTEXT_CREATE_EXT_SETPARAM,
+			.next_extension = 0, /* end of chain */
+		},
+		.param = {
+			.param = I915_CONTEXT_PARAM_RINGSIZE,
+			.value = 512 << 10,
+		}
+	};
+	struct drm_i915_gem_context_create_ext create = {
+		.flags = I915_CONTEXT_CREATE_FLAGS_USE_EXTENSIONS,
+		.extensions = to_user_pointer(&p),
+	};
+
+	igt_assert_eq(create_ext_ioctl(i915, &create),  0);
+
+	p.param.ctx_id = create.ctx_id;
+	p.param.value = 0;
+	gem_context_get_param(i915, &p.param);
+	igt_assert_eq(p.param.value, 512 << 10);
+
+	gem_context_destroy(i915, create.ctx_id);
+}
+
+static void test_clone(int i915)
+{
+	struct drm_i915_gem_context_create_ext_setparam p = {
+		.base = {
+			.name = I915_CONTEXT_CREATE_EXT_SETPARAM,
+			.next_extension = 0, /* end of chain */
+		},
+		.param = {
+			.param = I915_CONTEXT_PARAM_RINGSIZE,
+			.value = 512 << 10,
+		}
+	};
+	struct drm_i915_gem_context_create_ext create = {
+		.flags = I915_CONTEXT_CREATE_FLAGS_USE_EXTENSIONS,
+		.extensions = to_user_pointer(&p),
+	};
+
+	igt_assert_eq(create_ext_ioctl(i915, &create),  0);
+
+	p.param.ctx_id = gem_context_clone(i915, create.ctx_id,
+					   I915_CONTEXT_CLONE_ENGINES, 0);
+	igt_assert_neq(p.param.ctx_id, create.ctx_id);
+	gem_context_destroy(i915, create.ctx_id);
+
+	p.param.value = 0;
+	gem_context_get_param(i915, &p.param);
+	igt_assert_eq(p.param.value, 512 << 10);
+
+	gem_context_destroy(i915, p.param.ctx_id);
+}
+
+static int __execbuf(int i915, struct drm_i915_gem_execbuffer2 *execbuf)
+{
+	int err;
+
+	err = 0;
+	if (ioctl(i915, DRM_IOCTL_I915_GEM_EXECBUFFER2, execbuf))
+		err = -errno;
+
+	errno = 0;
+	return err;
+}
+
+static uint32_t __batch_create(int i915, uint32_t offset)
+{
+	const uint32_t bbe = 0xa << 23;
+	uint32_t handle;
+
+	handle = gem_create(i915, ALIGN(offset + sizeof(bbe), 4096));
+	gem_write(i915, handle, offset, &bbe, sizeof(bbe));
+
+	return handle;
+}
+
+static uint32_t batch_create(int i915)
+{
+	return __batch_create(i915, 0);
+}
+
+static unsigned int measure_inflight(int i915, unsigned int engine)
+{
+	IGT_CORK_FENCE(cork);
+	struct drm_i915_gem_exec_object2 obj = {
+		.handle = batch_create(i915)
+	};
+	struct drm_i915_gem_execbuffer2 execbuf = {
+		.buffers_ptr = to_user_pointer(&obj),
+		.buffer_count = 1,
+		.flags = engine | I915_EXEC_FENCE_IN,
+		.rsvd2 = igt_cork_plug(&cork, i915),
+	};
+	unsigned int count;
+
+	fcntl(i915, F_SETFL, fcntl(i915, F_GETFL) | O_NONBLOCK);
+
+	gem_execbuf(i915, &execbuf);
+	for (count = 1; __execbuf(i915, &execbuf) == 0; count++)
+		;
+	close(execbuf.rsvd2);
+
+	fcntl(i915, F_SETFL, fcntl(i915, F_GETFL) & ~O_NONBLOCK);
+
+	igt_cork_unplug(&cork);
+	gem_close(i915, obj.handle);
+
+	return count;
+}
+
+static void test_resize(int i915,
+			const struct intel_execution_engine2 *e,
+			unsigned int flags)
+#define IDLE (1 << 0)
+{
+	struct drm_i915_gem_context_param p = {
+		.param = I915_CONTEXT_PARAM_RINGSIZE,
+	};
+	unsigned int prev[2] = {};
+	uint32_t saved;
+
+	gem_context_get_param(i915, &p);
+	saved = p.value;
+
+	gem_quiescent_gpu(i915);
+	for (p.value = 1 << 12; p.value <= 128 << 12; p.value <<= 1) {
+		unsigned int count;
+
+		gem_context_set_param(i915, &p);
+
+		count = measure_inflight(i915, e->flags);
+		igt_info("%s: %llx -> %d\n", e->name, p.value, count);
+		igt_assert(count > 3 * (prev[1] - prev[0]) / 4 + prev[1]);
+		if (flags & IDLE)
+			gem_quiescent_gpu(i915);
+
+		prev[0] = prev[1];
+		prev[1] = count;
+	}
+	gem_quiescent_gpu(i915);
+
+	p.value = saved;
+	gem_context_set_param(i915, &p);
+}
+
+igt_main
+{
+	const struct intel_execution_engine2 *e;
+	int i915;
+
+	igt_fixture {
+		i915 = drm_open_driver(DRIVER_INTEL);
+		igt_require_gem(i915);
+
+		igt_require(has_ringsize(i915));
+	}
+
+	igt_subtest("idempotent")
+		test_idempotent(i915);
+
+	igt_subtest("invalid")
+		test_invalid(i915);
+
+	igt_subtest("create")
+		test_create(i915);
+	igt_subtest("clone")
+		test_clone(i915);
+
+	__for_each_physical_engine(i915, e) {
+		igt_subtest_f("%s-idle", e->name)
+			test_resize(i915, e, IDLE);
+		igt_subtest_f("%s-active", e->name)
+			test_resize(i915, e, 0);
+	}
+
+	igt_fixture {
+		close(i915);
+	}
+}
diff --git a/tests/meson.build b/tests/meson.build
index f151c0a5e..9a2039a22 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -122,6 +122,7 @@ i915_progs = [
 	'gem_ctx_isolation',
 	'gem_ctx_param',
 	'gem_ctx_persistence',
+	'gem_ctx_ringsize',
 	'gem_ctx_shared',
 	'gem_ctx_switch',
 	'gem_ctx_thrash',
-- 
2.24.0.rc0

_______________________________________________
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Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

^ permalink raw reply related	[flat|nested] 20+ messages in thread
* [Intel-gfx] [PATCH i-g-t 9/9] i915: Exercise I915_CONTEXT_PARAM_RINGSIZE
@ 2019-10-24 10:54   ` Chris Wilson
  0 siblings, 0 replies; 20+ messages in thread
From: Chris Wilson @ 2019-10-24 10:54 UTC (permalink / raw)
  To: intel-gfx

I915_CONTEXT_PARAM_RINGSIZE specifies how large to create the command
ringbuffer for logical ring contects. This directly affects the number
of batches userspace can submit before blocking waiting for space.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 tests/Makefile.sources        |   3 +
 tests/i915/gem_ctx_ringsize.c | 296 ++++++++++++++++++++++++++++++++++
 tests/meson.build             |   1 +
 3 files changed, 300 insertions(+)
 create mode 100644 tests/i915/gem_ctx_ringsize.c

diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index b22d63265..eb802d189 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -160,6 +160,9 @@ gem_ctx_param_SOURCES = i915/gem_ctx_param.c
 TESTS_progs += gem_ctx_persistence
 gem_ctx_persistence_SOURCES = i915/gem_ctx_persistence.c
 
+TESTS_progs += gem_ctx_ringsize
+gem_ctx_ringsize_SOURCES = i915/gem_ctx_ringsize.c
+
 TESTS_progs += gem_ctx_shared
 gem_ctx_shared_SOURCES = i915/gem_ctx_shared.c
 
diff --git a/tests/i915/gem_ctx_ringsize.c b/tests/i915/gem_ctx_ringsize.c
new file mode 100644
index 000000000..1450e8f0d
--- /dev/null
+++ b/tests/i915/gem_ctx_ringsize.c
@@ -0,0 +1,296 @@
+/*
+ * Copyright © 2019 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 <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "drmtest.h" /* gem_quiescent_gpu()! */
+#include "i915/gem_context.h"
+#include "i915/gem_engine_topology.h"
+#include "ioctl_wrappers.h" /* gem_wait()! */
+#include "sw_sync.h"
+
+#define I915_CONTEXT_PARAM_RINGSIZE 0xc
+
+static bool has_ringsize(int i915)
+{
+	struct drm_i915_gem_context_param p = {
+		.param = I915_CONTEXT_PARAM_RINGSIZE,
+	};
+
+	return __gem_context_get_param(i915, &p) == 0;
+}
+
+static void test_idempotent(int i915)
+{
+	struct drm_i915_gem_context_param p = {
+		.param = I915_CONTEXT_PARAM_RINGSIZE,
+	};
+	uint32_t saved;
+
+	/*
+	 * Simple test to verify that we are able to read back the same
+	 * value as we set.
+	 */
+
+	gem_context_get_param(i915, &p);
+	saved = p.value;
+
+	for (uint32_t x = 1 << 12; x <= 128 << 12; x <<= 1) {
+		p.value = x;
+		gem_context_set_param(i915, &p);
+		gem_context_get_param(i915, &p);
+		igt_assert_eq_u32(p.value, x);
+	}
+
+	p.value = saved;
+	gem_context_set_param(i915, &p);
+}
+
+static void test_invalid(int i915)
+{
+	struct drm_i915_gem_context_param p = {
+		.param = I915_CONTEXT_PARAM_RINGSIZE,
+	};
+	uint64_t invalid[] = {
+		0, 1, 4095, 4097, 8191, 8193,
+		/* upper limit may be HW dependent, atm it is 512KiB */
+		(512 << 10) - 1, (512 << 10) + 1,
+		-1, -1u
+	};
+	uint32_t saved;
+
+	gem_context_get_param(i915, &p);
+	saved = p.value;
+
+	for (int i = 0; i < ARRAY_SIZE(invalid); i++) {
+		p.value = invalid[i];
+		igt_assert_eq(__gem_context_set_param(i915, &p), -EINVAL);
+		gem_context_get_param(i915, &p);
+		igt_assert_eq_u64(p.value, saved);
+	}
+}
+
+static int create_ext_ioctl(int i915,
+			    struct drm_i915_gem_context_create_ext *arg)
+{
+	int err;
+
+	err = 0;
+	if (igt_ioctl(i915, DRM_IOCTL_I915_GEM_CONTEXT_CREATE_EXT, arg)) {
+		err = -errno;
+		igt_assume(err);
+	}
+
+	errno = 0;
+	return err;
+}
+
+static void test_create(int i915)
+{
+	struct drm_i915_gem_context_create_ext_setparam p = {
+		.base = {
+			.name = I915_CONTEXT_CREATE_EXT_SETPARAM,
+			.next_extension = 0, /* end of chain */
+		},
+		.param = {
+			.param = I915_CONTEXT_PARAM_RINGSIZE,
+			.value = 512 << 10,
+		}
+	};
+	struct drm_i915_gem_context_create_ext create = {
+		.flags = I915_CONTEXT_CREATE_FLAGS_USE_EXTENSIONS,
+		.extensions = to_user_pointer(&p),
+	};
+
+	igt_assert_eq(create_ext_ioctl(i915, &create),  0);
+
+	p.param.ctx_id = create.ctx_id;
+	p.param.value = 0;
+	gem_context_get_param(i915, &p.param);
+	igt_assert_eq(p.param.value, 512 << 10);
+
+	gem_context_destroy(i915, create.ctx_id);
+}
+
+static void test_clone(int i915)
+{
+	struct drm_i915_gem_context_create_ext_setparam p = {
+		.base = {
+			.name = I915_CONTEXT_CREATE_EXT_SETPARAM,
+			.next_extension = 0, /* end of chain */
+		},
+		.param = {
+			.param = I915_CONTEXT_PARAM_RINGSIZE,
+			.value = 512 << 10,
+		}
+	};
+	struct drm_i915_gem_context_create_ext create = {
+		.flags = I915_CONTEXT_CREATE_FLAGS_USE_EXTENSIONS,
+		.extensions = to_user_pointer(&p),
+	};
+
+	igt_assert_eq(create_ext_ioctl(i915, &create),  0);
+
+	p.param.ctx_id = gem_context_clone(i915, create.ctx_id,
+					   I915_CONTEXT_CLONE_ENGINES, 0);
+	igt_assert_neq(p.param.ctx_id, create.ctx_id);
+	gem_context_destroy(i915, create.ctx_id);
+
+	p.param.value = 0;
+	gem_context_get_param(i915, &p.param);
+	igt_assert_eq(p.param.value, 512 << 10);
+
+	gem_context_destroy(i915, p.param.ctx_id);
+}
+
+static int __execbuf(int i915, struct drm_i915_gem_execbuffer2 *execbuf)
+{
+	int err;
+
+	err = 0;
+	if (ioctl(i915, DRM_IOCTL_I915_GEM_EXECBUFFER2, execbuf))
+		err = -errno;
+
+	errno = 0;
+	return err;
+}
+
+static uint32_t __batch_create(int i915, uint32_t offset)
+{
+	const uint32_t bbe = 0xa << 23;
+	uint32_t handle;
+
+	handle = gem_create(i915, ALIGN(offset + sizeof(bbe), 4096));
+	gem_write(i915, handle, offset, &bbe, sizeof(bbe));
+
+	return handle;
+}
+
+static uint32_t batch_create(int i915)
+{
+	return __batch_create(i915, 0);
+}
+
+static unsigned int measure_inflight(int i915, unsigned int engine)
+{
+	IGT_CORK_FENCE(cork);
+	struct drm_i915_gem_exec_object2 obj = {
+		.handle = batch_create(i915)
+	};
+	struct drm_i915_gem_execbuffer2 execbuf = {
+		.buffers_ptr = to_user_pointer(&obj),
+		.buffer_count = 1,
+		.flags = engine | I915_EXEC_FENCE_IN,
+		.rsvd2 = igt_cork_plug(&cork, i915),
+	};
+	unsigned int count;
+
+	fcntl(i915, F_SETFL, fcntl(i915, F_GETFL) | O_NONBLOCK);
+
+	gem_execbuf(i915, &execbuf);
+	for (count = 1; __execbuf(i915, &execbuf) == 0; count++)
+		;
+	close(execbuf.rsvd2);
+
+	fcntl(i915, F_SETFL, fcntl(i915, F_GETFL) & ~O_NONBLOCK);
+
+	igt_cork_unplug(&cork);
+	gem_close(i915, obj.handle);
+
+	return count;
+}
+
+static void test_resize(int i915,
+			const struct intel_execution_engine2 *e,
+			unsigned int flags)
+#define IDLE (1 << 0)
+{
+	struct drm_i915_gem_context_param p = {
+		.param = I915_CONTEXT_PARAM_RINGSIZE,
+	};
+	unsigned int prev[2] = {};
+	uint32_t saved;
+
+	gem_context_get_param(i915, &p);
+	saved = p.value;
+
+	gem_quiescent_gpu(i915);
+	for (p.value = 1 << 12; p.value <= 128 << 12; p.value <<= 1) {
+		unsigned int count;
+
+		gem_context_set_param(i915, &p);
+
+		count = measure_inflight(i915, e->flags);
+		igt_info("%s: %llx -> %d\n", e->name, p.value, count);
+		igt_assert(count > 3 * (prev[1] - prev[0]) / 4 + prev[1]);
+		if (flags & IDLE)
+			gem_quiescent_gpu(i915);
+
+		prev[0] = prev[1];
+		prev[1] = count;
+	}
+	gem_quiescent_gpu(i915);
+
+	p.value = saved;
+	gem_context_set_param(i915, &p);
+}
+
+igt_main
+{
+	const struct intel_execution_engine2 *e;
+	int i915;
+
+	igt_fixture {
+		i915 = drm_open_driver(DRIVER_INTEL);
+		igt_require_gem(i915);
+
+		igt_require(has_ringsize(i915));
+	}
+
+	igt_subtest("idempotent")
+		test_idempotent(i915);
+
+	igt_subtest("invalid")
+		test_invalid(i915);
+
+	igt_subtest("create")
+		test_create(i915);
+	igt_subtest("clone")
+		test_clone(i915);
+
+	__for_each_physical_engine(i915, e) {
+		igt_subtest_f("%s-idle", e->name)
+			test_resize(i915, e, IDLE);
+		igt_subtest_f("%s-active", e->name)
+			test_resize(i915, e, 0);
+	}
+
+	igt_fixture {
+		close(i915);
+	}
+}
diff --git a/tests/meson.build b/tests/meson.build
index f151c0a5e..9a2039a22 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -122,6 +122,7 @@ i915_progs = [
 	'gem_ctx_isolation',
 	'gem_ctx_param',
 	'gem_ctx_persistence',
+	'gem_ctx_ringsize',
 	'gem_ctx_shared',
 	'gem_ctx_switch',
 	'gem_ctx_thrash',
-- 
2.24.0.rc0

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

^ permalink raw reply related	[flat|nested] 20+ messages in thread
* ✗ GitLab.Pipeline: warning for series starting with [1/9] i915_drm.h sync
@ 2019-10-24 12:45   ` Patchwork
  0 siblings, 0 replies; 20+ messages in thread
From: Patchwork @ 2019-10-24 12:45 UTC (permalink / raw)
  To: Chris Wilson; +Cc: intel-gfx

== Series Details ==

Series: series starting with [1/9] i915_drm.h sync
URL   : https://patchwork.freedesktop.org/series/68508/
State : warning

== Summary ==

Did not get list of undocumented tests for this run, something is wrong!

Other than that, pipeline status: FAILED.

see https://gitlab.freedesktop.org/gfx-ci/igt-ci-tags/pipelines/73090 for more details

== Logs ==

For more details see: https://gitlab.freedesktop.org/gfx-ci/igt-ci-tags/pipelines/73090
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

^ permalink raw reply	[flat|nested] 20+ messages in thread
* [Intel-gfx] ✗ GitLab.Pipeline: warning for series starting with [1/9] i915_drm.h sync
@ 2019-10-24 12:45   ` Patchwork
  0 siblings, 0 replies; 20+ messages in thread
From: Patchwork @ 2019-10-24 12:45 UTC (permalink / raw)
  To: Chris Wilson; +Cc: intel-gfx

== Series Details ==

Series: series starting with [1/9] i915_drm.h sync
URL   : https://patchwork.freedesktop.org/series/68508/
State : warning

== Summary ==

Did not get list of undocumented tests for this run, something is wrong!

Other than that, pipeline status: FAILED.

see https://gitlab.freedesktop.org/gfx-ci/igt-ci-tags/pipelines/73090 for more details

== Logs ==

For more details see: https://gitlab.freedesktop.org/gfx-ci/igt-ci-tags/pipelines/73090
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

^ permalink raw reply	[flat|nested] 20+ messages in thread
end of thread, other threads:[~2019-10-24 12:45 UTC | newest]

Thread overview: 20+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-10-24 10:54 [PATCH i-g-t 1/9] i915_drm.h sync Chris Wilson
2019-10-24 10:54 ` [Intel-gfx] " Chris Wilson
2019-10-24 10:54 ` [PATCH i-g-t 2/9] lib/i915: Expose I915_CONTEXT_PARAM_PERSISTENCE Chris Wilson
2019-10-24 10:54   ` [Intel-gfx] " Chris Wilson
2019-10-24 10:54 ` [PATCH i-g-t 3/9] Add i915/gem_ctx_persistence Chris Wilson
2019-10-24 10:54   ` [Intel-gfx] " Chris Wilson
2019-10-24 10:54 ` [PATCH i-g-t 4/9] i915: Start putting the mmio_base to wider use Chris Wilson
2019-10-24 10:54   ` [Intel-gfx] " Chris Wilson
2019-10-24 10:54 ` [PATCH i-g-t 5/9] i915/gem_ctx_isolation: Check engine relative registers Chris Wilson
2019-10-24 10:54   ` [Intel-gfx] " Chris Wilson
2019-10-24 10:54 ` [PATCH i-g-t 6/9] i915: Exercise preemption timeout controls in sysfs Chris Wilson
2019-10-24 10:54   ` [Intel-gfx] " Chris Wilson
2019-10-24 10:54 ` [PATCH i-g-t 7/9] i915: Exercise sysfs heartbeat controls Chris Wilson
2019-10-24 10:54   ` [Intel-gfx] " Chris Wilson
2019-10-24 10:54 ` [PATCH i-g-t 8/9] i915: Exercise timeslice sysfs property Chris Wilson
2019-10-24 10:54   ` [Intel-gfx] " Chris Wilson
2019-10-24 10:54 ` [PATCH i-g-t 9/9] i915: Exercise I915_CONTEXT_PARAM_RINGSIZE Chris Wilson
2019-10-24 10:54   ` [Intel-gfx] " Chris Wilson
2019-10-24 12:45 ` ✗ GitLab.Pipeline: warning for series starting with [1/9] i915_drm.h sync Patchwork
2019-10-24 12:45   ` [Intel-gfx] " Patchwork

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