On 01/02/2021 08:56, Chris Wilson wrote:
Let userspace know if they can trust timeslicing by including it as part
of the I915_PARAM_HAS_SCHEDULER::I915_SCHEDULER_CAP_TIMESLICING
v2: Only declare timeslicing if we can safely preempt userspace.
Fixes: 8ee36e048c98 ("drm/i915/execlists: Minimalistic timeslicing")
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_engine_user.c | 26 +++++++++++++++------
include/uapi/drm/i915_drm.h | 1 +
2 files changed, 20 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_user.c b/drivers/gpu/drm/i915/gt/intel_engine_user.c
index 64eccdf32a22..50911fbe6368 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_user.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_user.c
@@ -90,13 +90,17 @@ static void sort_engines(struct drm_i915_private *i915,
static void set_scheduler_caps(struct drm_i915_private *i915)
{
static const struct {
- u8 engine;
- u8 sched;
- } map[] = {
+ u8 flag;
+ u8 cap;
+ } engine_map[] = {
#define MAP(x, y) { ilog2(I915_ENGINE_##x), ilog2(I915_SCHEDULER_CAP_##y) }
MAP(HAS_PREEMPTION, PREEMPTION),
MAP(HAS_SEMAPHORES, SEMAPHORES),
MAP(SUPPORTS_STATS, ENGINE_BUSY_STATS),
+#undef MAP
+ }, sched_map[] = {
+#define MAP(x, y) { ilog2(I915_SCHED_##x), ilog2(I915_SCHEDULER_CAP_##y) }
+ MAP(HAS_TIMESLICES_BIT, TIMESLICING),
#undef MAP
};
struct intel_engine_cs *engine;
@@ -105,6 +109,7 @@ static void set_scheduler_caps(struct drm_i915_private *i915)
enabled = 0;
disabled = 0;
for_each_uabi_engine(engine, i915) { /* all engines must agree! */
+ struct i915_sched *se = intel_engine_get_scheduler(engine);
int i;
if (intel_engine_has_scheduler(engine))
@@ -114,11 +119,18 @@ static void set_scheduler_caps(struct drm_i915_private *i915)
disabled |= (I915_SCHEDULER_CAP_ENABLED |
I915_SCHEDULER_CAP_PRIORITY);
- for (i = 0; i < ARRAY_SIZE(map); i++) {
- if (engine->flags & BIT(map[i].engine))
- enabled |= BIT(map[i].sched);
+ for (i = 0; i < ARRAY_SIZE(engine_map); i++) {
+ if (engine->flags & BIT(engine_map[i].flag))
+ enabled |= BIT(engine_map[i].cap);
else
- disabled |= BIT(map[i].sched);
+ disabled |= BIT(engine_map[i].cap);
+ }
+
+ for (i = 0; i < ARRAY_SIZE(sched_map); i++) {
+ if (se->flags & BIT(sched_map[i].flag))
+ enabled |= BIT(sched_map[i].cap);
+ else
+ disabled |= BIT(sched_map[i].cap);
}
}
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 1987e2ea79a3..cda0f391d965 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -524,6 +524,7 @@ typedef struct drm_i915_irq_wait {
#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_SCHEDULER_CAP_TIMESLICING (1ul << 5)
#define I915_PARAM_HUC_STATUS 42
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Regards,
Tvrtko
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