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drm/i915/gt: Expose timeslice duration to sysfs

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Execlists uses a scheduling quantum (a timeslice) to alternate execution
between ready-to-run contexts of equal priority. This ensures that all
users (though only if they of equal importance) have the opportunity to
run and prevents livelocks where contexts may have implicit ordering due
to userspace semaphores.

The timeslicing mechanism can be compiled out with

	./scripts/config --set-val DRM_I915_TIMESLICE_DURATION 0

The timeslice duration can be adjusted per-engine using,

	/sys/class/drm/card?/engine/*/timeslice_duration_ms

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Steve Carbonari <steven.carbonari@intel.com>
Tested-by: Steve Carbonari <steven.carbonari@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200228131716.3243616-3-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-02-28 13:17:12 +00:00
parent 6e57cc3942
commit 1a2695a746
2 changed files with 49 additions and 0 deletions
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3
drivers/gpu/drm/i915/Kconfig.profile
View File

@ -73,4 +73,7 @@ config DRM_I915_TIMESLICE_DURATION
is scheduled for execution for the timeslice duration, before
switching to the next context.
This is adjustable via
/sys/class/drm/card?/engine/*/timeslice_duration_ms
May be 0 to disable timeslicing.

46
drivers/gpu/drm/i915/gt/sysfs_engines.c
View File

@ -142,6 +142,48 @@ all_caps_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
static struct kobj_attribute all_caps_attr =
__ATTR(known_capabilities, 0444, all_caps_show, NULL);
static ssize_t
timeslice_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct intel_engine_cs *engine = kobj_to_engine(kobj);
unsigned long long duration;
int err;
/*
* Execlists uses a scheduling quantum (a timeslice) to alternate
* execution between ready-to-run contexts of equal priority. This
* ensures that all users (though only if they of equal importance)
* have the opportunity to run and prevents livelocks where contexts
* may have implicit ordering due to userspace semaphores.
*/
err = kstrtoull(buf, 0, &duration);
if (err)
return err;
if (duration > jiffies_to_msecs(MAX_SCHEDULE_TIMEOUT))
return -EINVAL;
WRITE_ONCE(engine->props.timeslice_duration_ms, duration);
if (execlists_active(&engine->execlists))
set_timer_ms(&engine->execlists.timer, duration);
return count;
}
static ssize_t
timeslice_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
struct intel_engine_cs *engine = kobj_to_engine(kobj);
return sprintf(buf, "%lu\n", engine->props.timeslice_duration_ms);
}
static struct kobj_attribute timeslice_duration_attr =
__ATTR(timeslice_duration_ms, 0644, timeslice_show, timeslice_store);
static void kobj_engine_release(struct kobject *kobj)
{
kfree(kobj);
@ -203,6 +245,10 @@ void intel_engines_add_sysfs(struct drm_i915_private *i915)
if (sysfs_create_files(kobj, files))
goto err_object;
if (intel_engine_has_timeslices(engine) &&
sysfs_create_file(kobj, &timeslice_duration_attr.attr))
goto err_engine;
if (0) {
err_object:
kobject_put(kobj);