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drm/i915/gvt: grab runtime pm first for forcewake use 

in workload_thread, it should grab runtime pm wakelock and later
uncore forcewake get will check rpm wakelock held successfully.
otherwise, sometimes, rpm wakelock not hold and print call trace below:

 Call Trace:
  intel_uncore_forcewake_get+0x15/0x20 [i915]
  workload_thread+0x5f9/0x16f0 [i915]
  ? __switch_to_asm+0x34/0x70
  ? __switch_to_asm+0x40/0x70
  ? __switch_to_asm+0x34/0x70
  ? __switch_to_asm+0x40/0x70
  ? __switch_to_asm+0x34/0x70
  ? __switch_to+0x85/0x3f0
  ? __switch_to_asm+0x40/0x70
  ? do_wait_intr_irq+0x90/0x90
  kthread+0x121/0x140
  ? intel_vgpu_clean_workloads+0x100/0x100 [i915]
  ? kthread_park+0x90/0x90
  ret_from_fork+0x35/0x40
 --[ end trace 86525f742a02e12c ]--

v2: adapted to use rpm structure.

Fixes: 251d46b087 ("drm/i915/gvt: Pin the per-engine GVT shadow contexts")
Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Xiaolin Zhang <xiaolin.zhang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
alistair/sunxi64-5.4-dsi
Xiaolin Zhang 2019-06-20 10:29:24 -04:00 committed by Zhenyu Wang
parent 7366aeb77c
commit ef5b0b444e
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/i915/gvt/scheduler.c
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@ -990,6 +990,7 @@ static int workload_thread(void *priv)
int ret;
bool need_force_wake = (INTEL_GEN(gvt->dev_priv) >= 9);
DEFINE_WAIT_FUNC(wait, woken_wake_function);
struct intel_runtime_pm *rpm = &gvt->dev_priv->runtime_pm;
kfree(p);
@ -1013,6 +1014,8 @@ static int workload_thread(void *priv)
workload->ring_id, workload,
workload->vgpu->id);
intel_runtime_pm_get(rpm);
gvt_dbg_sched("ring id %d will dispatch workload %p\n",
workload->ring_id, workload);
@ -1042,6 +1045,7 @@ complete:
intel_uncore_forcewake_put(&gvt->dev_priv->uncore,
FORCEWAKE_ALL);
intel_runtime_pm_put_unchecked(rpm);
if (ret && (vgpu_is_vm_unhealthy(ret)))
enter_failsafe_mode(vgpu, GVT_FAILSAFE_GUEST_ERR);
}