diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2016-08-05 10:14:11 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2016-08-05 10:54:37 +0100 |
| commit | dcff85c8443e7ad6abda897678d2fd5a950a64ad (patch) | |
| tree | c987564351548f418b3d66c536c83f04fe283479 /drivers/gpu/drm/i915/i915_irq.c | |
| parent | 90f4fcd56bda1f52381bbd5034e8fb32688e779b (diff) | |
drm/i915: Enable i915_gem_wait_for_idle() without holding struct_mutex
The principal motivation for this was to try and eliminate the
struct_mutex from i915_gem_suspend - but we still need to hold the mutex
current for the i915_gem_context_lost(). (The issue there is that there
may be an indirect lockdep cycle between cpu_hotplug (i.e. suspend) and
struct_mutex via the stop_machine().) For the moment, enabling last
request tracking for the engine, allows us to do busyness checking and
waiting without requiring the struct_mutex - which is useful in its own
right.
As a side-effect of having a robust means for tracking engine busyness,
we can replace our other busyness heuristic, that of comparing against
the last submitted seqno. For paranoid reasons, we have a semi-ordered
check of that seqno inside the hangchecker, which we can now improve to
an ordered check of the engine's busyness (removing a locked xchg in the
process).
v2: Pass along "bool interruptible" as being unlocked we cannot rely on
i915->mm.interruptible being stable or even under our control.
v3: Replace check Ironlake i915_gpu_busy() with the common precalculated value
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1470388464-28458-6-git-send-email-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/i915_irq.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_irq.c | 9 |
1 files changed, 1 insertions, 8 deletions
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index e58650096426..006a855877ad 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -2805,13 +2805,6 @@ static void gen8_disable_vblank(struct drm_device *dev, unsigned int pipe) } static bool -ring_idle(struct intel_engine_cs *engine, u32 seqno) -{ - return i915_seqno_passed(seqno, - READ_ONCE(engine->last_submitted_seqno)); -} - -static bool ipehr_is_semaphore_wait(struct intel_engine_cs *engine, u32 ipehr) { if (INTEL_GEN(engine->i915) >= 8) { @@ -3131,7 +3124,7 @@ static void i915_hangcheck_elapsed(struct work_struct *work) user_interrupts = 0; if (engine->hangcheck.seqno == seqno) { - if (ring_idle(engine, seqno)) { + if (!intel_engine_is_active(engine)) { engine->hangcheck.action = HANGCHECK_IDLE; if (busy) { /* Safeguard against driver failure */ |