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drm/i915: Split out parking from the idle worker for reuse

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We will want to park GEM before disengaging the drive^W^W^W unwedging.
Since we already do the work for idling, expose the guts as a new
function that we can then reuse.

v2: Just skip if already parked; makes it more forgiving to use by
future callers.
v3: Extract mark_busy, rename it to i915_gem_unpark and place it next to
i915_gem_park so that we can evaluate it for symmetry more easily.
Calling GEM from inside i915_request looks to be a bit of a layering
violation, for the moment I am imaging them as being notify_cb.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> #v1
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180406155144.27791-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2018-04-06 16:51:44 +01:00
parent 29991d533f
commit e4d2006f8f
3 changed files with 103 additions and 77 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
drivers/gpu/drm/i915/i915_request.c
View File

@@ -255,47 +255,6 @@ int i915_gem_set_global_seqno(struct drm_device *dev, u32 seqno)
return reset_all_global_seqno(i915, seqno - 1);
}
static void mark_busy(struct drm_i915_private *i915)
{
if (i915->gt.awake)
return;
GEM_BUG_ON(!i915->gt.active_requests);
intel_runtime_pm_get_noresume(i915);
/*
* It seems that the DMC likes to transition between the DC states a lot
* when there are no connected displays (no active power domains) during
* command submission.
*
* This activity has negative impact on the performance of the chip with
* huge latencies observed in the interrupt handler and elsewhere.
*
* Work around it by grabbing a GT IRQ power domain whilst there is any
* GT activity, preventing any DC state transitions.
*/
intel_display_power_get(i915, POWER_DOMAIN_GT_IRQ);
i915->gt.awake = true;
if (unlikely(++i915->gt.epoch == 0)) /* keep 0 as invalid */
i915->gt.epoch = 1;
intel_enable_gt_powersave(i915);
i915_update_gfx_val(i915);
if (INTEL_GEN(i915) >= 6)
gen6_rps_busy(i915);
i915_pmu_gt_unparked(i915);
intel_engines_unpark(i915);
i915_queue_hangcheck(i915);
queue_delayed_work(i915->wq,
&i915->gt.retire_work,
round_jiffies_up_relative(HZ));
}
static int reserve_engine(struct intel_engine_cs *engine)
{
struct drm_i915_private *i915 = engine->i915;
@@ -313,7 +272,7 @@ static int reserve_engine(struct intel_engine_cs *engine)
}
if (!i915->gt.active_requests++)
mark_busy(i915);
i915_gem_unpark(i915);
return 0;
}
@@ -322,13 +281,8 @@ static void unreserve_engine(struct intel_engine_cs *engine)
{
struct drm_i915_private *i915 = engine->i915;
if (!--i915->gt.active_requests) {
/* Cancel the mark_busy() from our reserve_engine() */
GEM_BUG_ON(!i915->gt.awake);
mod_delayed_work(i915->wq,
&i915->gt.idle_work,
msecs_to_jiffies(100));
}
if (!--i915->gt.active_requests)
i915_gem_park(i915);
GEM_BUG_ON(!engine->timeline->inflight_seqnos);
engine->timeline->inflight_seqnos--;