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author | Chris Wilson <chris@chris-wilson.co.uk> | 2018-10-01 15:47:55 +0100 |
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committer | Chris Wilson <chris@chris-wilson.co.uk> | 2018-10-01 20:34:24 +0100 |
commit | e9eaf82d97a2b05460ff5ef6a3e07446f7d049fe (patch) | |
tree | 438f33d4ca7e450b661260806a97f4a2d0ad9bbd /drivers/gpu/drm/i915/i915_scheduler.h | |
parent | e2f3496e93be3238de2e2e6bfc83b3a83c084ce5 (diff) | |
download | linux-stable-e9eaf82d97a2b05460ff5ef6a3e07446f7d049fe.tar.gz linux-stable-e9eaf82d97a2b05460ff5ef6a3e07446f7d049fe.tar.bz2 linux-stable-e9eaf82d97a2b05460ff5ef6a3e07446f7d049fe.zip |
drm/i915: Priority boost for waiting clients
Latency is in the eye of the beholder. In the case where a client stops
and waits for the gpu, give that request chain a small priority boost
(not so that it overtakes higher priority clients, to preserve the
external ordering) so that ideally the wait completes earlier.
v2: Tvrtko recommends to keep the boost-from-user-stall as small as
possible and to allow new client flows to be preferred for interactivity
over stalls.
Testcase: igt/gem_sync/switch-default
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181001144755.7978-3-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/i915_scheduler.h')
-rw-r--r-- | drivers/gpu/drm/i915/i915_scheduler.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/i915_scheduler.h b/drivers/gpu/drm/i915/i915_scheduler.h index 68d84a45ad7f..dbe9cb7ecd82 100644 --- a/drivers/gpu/drm/i915/i915_scheduler.h +++ b/drivers/gpu/drm/i915/i915_scheduler.h @@ -24,13 +24,14 @@ enum { I915_PRIORITY_INVALID = INT_MIN }; -#define I915_USER_PRIORITY_SHIFT 1 +#define I915_USER_PRIORITY_SHIFT 2 #define I915_USER_PRIORITY(x) ((x) << I915_USER_PRIORITY_SHIFT) #define I915_PRIORITY_COUNT BIT(I915_USER_PRIORITY_SHIFT) #define I915_PRIORITY_MASK (I915_PRIORITY_COUNT - 1) -#define I915_PRIORITY_NEWCLIENT ((u8)BIT(0)) +#define I915_PRIORITY_WAIT ((u8)BIT(0)) +#define I915_PRIORITY_NEWCLIENT ((u8)BIT(1)) struct i915_sched_attr { /** @@ -99,6 +100,8 @@ void i915_sched_node_fini(struct drm_i915_private *i915, void i915_schedule(struct i915_request *request, const struct i915_sched_attr *attr); +void i915_schedule_bump_priority(struct i915_request *rq, unsigned int bump); + struct list_head * i915_sched_lookup_priolist(struct intel_engine_cs *engine, int prio); |