Re: [Intel-gfx] [PATCH igt] igt/gem_exec_schedule: Exercise "deep" preemption
On Wed, Apr 11, 2018 at 11:13:56AM +0100, Chris Wilson wrote:
> In investigating the issue with having to force preemption within the
> executing ELSP[], we want to trigger preemption between all elements of
> that array. To that end, we issue a series of requests with different
> priorities to fill the in-flight ELSP[] and then demand preemption into
> the middle of that series. One can think of even more complicated
> reordering requirements of ELSP[], trying to switch between every
> possible combination of permutations. Rather than check all 2 billion
> combinations, be content with a few.
>
> v2: Add a different pattern for queued requests. Not only do we need to
> inject a request into the middle of a single context with a queue of
> different priority contexts, but we also want a queue of different
> contexts, as they have different patterns of ELSP[] behaviour.
>
> Signed-off-by: Chris Wilson
> Cc: Mika Kuoppala
> Cc: Michał Winiarski
> ---
> tests/gem_exec_schedule.c | 188 ++
> 1 file changed, 169 insertions(+), 19 deletions(-)
>
> diff --git a/tests/gem_exec_schedule.c b/tests/gem_exec_schedule.c
> index d2f040ab..6ff15b6e 100644
> --- a/tests/gem_exec_schedule.c
> +++ b/tests/gem_exec_schedule.c
[snip]
> @@ -981,12 +1117,26 @@ igt_main
> igt_subtest_f("preempt-contexts-%s",
> e->name)
> preempt(fd, e->exec_id |
> e->flags, NEW_CTX);
>
> - igt_subtest_f("preempt-other-%s",
> e->name)
> - preempt_other(fd, e->exec_id |
> e->flags);
> -
> igt_subtest_f("preempt-self-%s",
> e->name)
> preempt_self(fd, e->exec_id |
> e->flags);
>
> + igt_subtest_f("preempt-other-%s",
> e->name)
> + preempt_other(fd, e->exec_id |
> e->flags, 0);
> +
> + igt_subtest_f("preempt-other-chain-%s",
> e->name)
> + preempt_other(fd, e->exec_id |
> e->flags, CHAIN);
> +
> + igt_subtest_f("preempt-queue-%s",
> e->name)
> + preempt_queue(fd, e->exec_id |
> e->flags, 0);
> +
> + igt_subtest_f("preempt-queue-chain-%s",
> e->name)
> + preempt_queue(fd, e->exec_id |
> e->flags, CHAIN);
> + igt_subtest_f("preempt-contexts-%s",
> e->name)
> + preempt_queue(fd, e->exec_id |
> e->flags, CONTEXTS);
With preempt-queue-contexts.
Reviewed-by: Michał Winiarski
-Michał
> +
> +
> igt_subtest_f("preempt-contexts-chain-%s", e->name)
> + preempt_queue(fd, e->exec_id |
> e->flags, CONTEXTS | CHAIN);
> +
> igt_subtest_group {
> igt_hang_t hang;
>
> --
> 2.17.0
>
___
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[Intel-gfx] [PATCH igt] igt/gem_exec_schedule: Exercise "deep" preemption
In investigating the issue with having to force preemption within the
executing ELSP[], we want to trigger preemption between all elements of
that array. To that end, we issue a series of requests with different
priorities to fill the in-flight ELSP[] and then demand preemption into
the middle of that series. One can think of even more complicated
reordering requirements of ELSP[], trying to switch between every
possible combination of permutations. Rather than check all 2 billion
combinations, be content with a few.
v2: Add a different pattern for queued requests. Not only do we need to
inject a request into the middle of a single context with a queue of
different priority contexts, but we also want a queue of different
contexts, as they have different patterns of ELSP[] behaviour.
Signed-off-by: Chris Wilson
Cc: Mika Kuoppala
Cc: Michał Winiarski
---
tests/gem_exec_schedule.c | 188 ++
1 file changed, 169 insertions(+), 19 deletions(-)
diff --git a/tests/gem_exec_schedule.c b/tests/gem_exec_schedule.c
index d2f040ab..6ff15b6e 100644
--- a/tests/gem_exec_schedule.c
+++ b/tests/gem_exec_schedule.c
@@ -373,13 +373,78 @@ static void preempt(int fd, unsigned ring, unsigned flags)
gem_close(fd, result);
}
-static void preempt_other(int fd, unsigned ring)
+#define CHAIN 0x1
+#define CONTEXTS 0x2
+
+static igt_spin_t *__noise(int fd, uint32_t ctx, int prio, igt_spin_t *spin)
+{
+ unsigned other;
+
+ gem_context_set_priority(fd, ctx, prio);
+
+ for_each_physical_engine(fd, other) {
+ if (spin == NULL) {
+ spin = __igt_spin_batch_new(fd, ctx, other, 0);
+ } else {
+ struct drm_i915_gem_exec_object2 obj = {
+ .handle = spin->handle,
+ };
+ struct drm_i915_gem_execbuffer2 eb = {
+ .buffer_count = 1,
+ .buffers_ptr = to_user_pointer(&obj),
+ .rsvd1 = ctx,
+ .flags = other,
+ };
+ gem_execbuf(fd, &eb);
+ }
+ }
+
+ return spin;
+}
+
+static void __preempt_other(int fd,
+ uint32_t *ctx,
+ unsigned int target, unsigned int primary,
+ unsigned flags)
{
uint32_t result = gem_create(fd, 4096);
uint32_t *ptr = gem_mmap__gtt(fd, result, 4096, PROT_READ);
- igt_spin_t *spin[MAX_ENGINES];
- unsigned int other;
- unsigned int n, i;
+ unsigned int n, i, other;
+
+ n = 0;
+ store_dword(fd, ctx[LO], primary,
+ result, (n + 1)*sizeof(uint32_t), n + 1,
+ 0, I915_GEM_DOMAIN_RENDER);
+ n++;
+
+ if (flags & CHAIN) {
+ for_each_physical_engine(fd, other) {
+ store_dword(fd, ctx[LO], other,
+ result, (n + 1)*sizeof(uint32_t), n + 1,
+ 0, I915_GEM_DOMAIN_RENDER);
+ n++;
+ }
+ }
+
+ store_dword(fd, ctx[HI], target,
+ result, (n + 1)*sizeof(uint32_t), n + 1,
+ 0, I915_GEM_DOMAIN_RENDER);
+
+ igt_debugfs_dump(fd, "i915_engine_info");
+ gem_set_domain(fd, result, I915_GEM_DOMAIN_GTT, 0);
+
+ n++;
+ for (i = 0; i <= n; i++)
+ igt_assert_eq_u32(ptr[i], i);
+
+ munmap(ptr, 4096);
+ gem_close(fd, result);
+}
+
+static void preempt_other(int fd, unsigned ring, unsigned int flags)
+{
+ unsigned int primary;
+ igt_spin_t *spin = NULL;
uint32_t ctx[3];
/* On each engine, insert
@@ -396,36 +461,97 @@ static void preempt_other(int fd, unsigned ring)
gem_context_set_priority(fd, ctx[LO], MIN_PRIO);
ctx[NOISE] = gem_context_create(fd);
+ spin = __noise(fd, ctx[NOISE], 0, NULL);
ctx[HI] = gem_context_create(fd);
gem_context_set_priority(fd, ctx[HI], MAX_PRIO);
+ for_each_physical_engine(fd, primary) {
+ igt_debug("Primary engine: %s\n", e__->name);
+ __preempt_other(fd, ctx, ring, primary, flags);
+
+ }
+
+ igt_assert(gem_bo_busy(fd, spin->handle));
+ igt_spin_batch_free(fd, spin);
+
+ gem_context_destroy(fd, ctx[LO]);
+ gem_context_destroy(fd, ctx[NOISE]);
+ gem_context_destroy(fd, ctx[HI]);
+}
+
+static void __preempt_queue(int fd,
+ unsigned target, unsigned primary,
+ unsigned depth, unsigned flags)
+{
+ uint32_t result = gem_create(fd, 4096);
+ uint32_t *ptr = gem_mmap__gtt(fd, result, 4096, PROT_READ);
+ igt_spin_t *above = NULL, *below = NULL;
+ unsigned int other, n, i;
+ int prio = MAX_PRIO;
+ uint32_t ctx[3] =
[Intel-gfx] [PATCH igt] igt/gem_exec_schedule: Exercise "deep" preemption
In investigating the issue with having to force preemption within the
executing ELSP[], we want to trigger preemption between all elements of
that array. To that end, we issue a series of requests with different
priorities to fill the in-flight ELSP[] and then demand preemption into
the middle of that series. One can think of even more complicated
reordering requirements of ELSP[], trying to switch between every
possible combination of permutations. Rather than check all 2 billion
combinations, be content with a few.
Signed-off-by: Chris Wilson
Cc: Mika Kuoppala
Cc: Michał Winiarski
---
tests/gem_exec_schedule.c | 172 +-
1 file changed, 153 insertions(+), 19 deletions(-)
diff --git a/tests/gem_exec_schedule.c b/tests/gem_exec_schedule.c
index 8a69ab5c..87fe4572 100644
--- a/tests/gem_exec_schedule.c
+++ b/tests/gem_exec_schedule.c
@@ -373,13 +373,77 @@ static void preempt(int fd, unsigned ring, unsigned flags)
gem_close(fd, result);
}
-static void preempt_other(int fd, unsigned ring)
+#define CHAIN 0x1
+
+static igt_spin_t *__noise(int fd, uint32_t ctx, int prio, igt_spin_t *spin)
+{
+ unsigned other;
+
+ gem_context_set_priority(fd, ctx, prio);
+
+ for_each_physical_engine(fd, other) {
+ if (spin == NULL) {
+ spin = __igt_spin_batch_new(fd, ctx, other, 0);
+ } else {
+ struct drm_i915_gem_exec_object2 obj = {
+ .handle = spin->handle,
+ };
+ struct drm_i915_gem_execbuffer2 eb = {
+ .buffer_count = 1,
+ .buffers_ptr = to_user_pointer(&obj),
+ .rsvd1 = ctx,
+ .flags = other,
+ };
+ gem_execbuf(fd, &eb);
+ }
+ }
+
+ return spin;
+}
+
+static void __preempt_other(int fd,
+ uint32_t *ctx,
+ unsigned int target, unsigned int primary,
+ unsigned flags)
{
uint32_t result = gem_create(fd, 4096);
uint32_t *ptr = gem_mmap__gtt(fd, result, 4096, PROT_READ);
- igt_spin_t *spin[MAX_ENGINES];
- unsigned int other;
- unsigned int n, i;
+ unsigned int n, i, other;
+
+ n = 0;
+ store_dword(fd, ctx[LO], primary,
+ result, (n + 1)*sizeof(uint32_t), n + 1,
+ 0, I915_GEM_DOMAIN_RENDER);
+ n++;
+
+ if (flags & CHAIN) {
+ for_each_physical_engine(fd, other) {
+ store_dword(fd, ctx[LO], other,
+ result, (n + 1)*sizeof(uint32_t), n + 1,
+ 0, I915_GEM_DOMAIN_RENDER);
+ n++;
+ }
+ }
+
+ store_dword(fd, ctx[HI], target,
+ result, (n + 1)*sizeof(uint32_t), n + 1,
+ 0, I915_GEM_DOMAIN_RENDER);
+
+ igt_debugfs_dump(fd, "i915_engine_info");
+ gem_set_domain(fd, result, I915_GEM_DOMAIN_GTT, 0);
+
+ n++;
+ for (i = 0; i <= n; i++)
+ igt_assert_eq_u32(ptr[i], i);
+
+ munmap(ptr, 4096);
+ gem_close(fd, result);
+}
+
+static void preempt_other(int fd, unsigned ring, unsigned int flags)
+{
+ unsigned int primary;
+ igt_spin_t *spin = NULL;
uint32_t ctx[3];
/* On each engine, insert
@@ -396,36 +460,87 @@ static void preempt_other(int fd, unsigned ring)
gem_context_set_priority(fd, ctx[LO], MIN_PRIO);
ctx[NOISE] = gem_context_create(fd);
+ spin = __noise(fd, ctx[NOISE], 0, NULL);
ctx[HI] = gem_context_create(fd);
gem_context_set_priority(fd, ctx[HI], MAX_PRIO);
+ for_each_physical_engine(fd, primary) {
+ igt_debug("Primary engine: %s\n", e__->name);
+ __preempt_other(fd, ctx, ring, primary, flags);
+
+ }
+
+ igt_assert(gem_bo_busy(fd, spin->handle));
+ igt_spin_batch_free(fd, spin);
+
+ gem_context_destroy(fd, ctx[LO]);
+ gem_context_destroy(fd, ctx[NOISE]);
+ gem_context_destroy(fd, ctx[HI]);
+}
+
+static void __preempt_queue(int fd,
+ unsigned target, unsigned primary,
+ unsigned depth, unsigned flags)
+{
+ uint32_t result = gem_create(fd, 4096);
+ uint32_t *ptr = gem_mmap__gtt(fd, result, 4096, PROT_READ);
+ igt_spin_t *above = NULL, *below = NULL;
+ unsigned int other, n, i;
+ int prio = MAX_PRIO;
+ uint32_t ctx[3] = {
+ gem_context_create(fd),
+ gem_context_create(fd),
+ gem_context_create(fd),
+ };
+
+ for (n = 0; n < depth; n++)
+ above = __noise(fd, ctx[NOISE], prio--, above);
+
+ gem_context_set_priority(fd, ctx[HI], pr
