[PATCH 8/9] drm/i915: Remove redundant intel_autoenable_gt_powersave()
Chris Wilson
chris at chris-wilson.co.uk
Sat Nov 4 19:32:05 UTC 2017
Now that we always execute a context switch upon module load, there is
no need to queue a delayed task for doing so. The purpose of the delayed
task is to enable GT powersaving, for which we need the HW state to be
valid (i.e. having loaded a context and initialised basic state). We
used to defer this operation as historically it was slow (due to slow
register polling, fixed with commit 1758b90e38f5 ("drm/i915: Use a hybrid
scheme for fast register waits")) but now we have a requirement to save
the default HW state.
v2: Load the kernel context (to provide the power context) upon resume.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
---
drivers/gpu/drm/i915/i915_drv.c | 11 +------
drivers/gpu/drm/i915/i915_drv.h | 1 -
drivers/gpu/drm/i915/i915_gem.c | 31 ++++++++++++++-----
drivers/gpu/drm/i915/intel_drv.h | 1 -
drivers/gpu/drm/i915/intel_pm.c | 66 ----------------------------------------
5 files changed, 24 insertions(+), 86 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index fa4839bcdd63..c53989f2a1f2 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1692,8 +1692,6 @@ static int i915_drm_resume(struct drm_device *dev)
intel_csr_ucode_resume(dev_priv);
- i915_gem_resume(dev_priv);
-
i915_restore_state(dev_priv);
intel_pps_unlock_regs_wa(dev_priv);
intel_opregion_setup(dev_priv);
@@ -1714,12 +1712,7 @@ static int i915_drm_resume(struct drm_device *dev)
drm_mode_config_reset(dev);
- mutex_lock(&dev->struct_mutex);
- if (i915_gem_init_hw(dev_priv)) {
- DRM_ERROR("failed to re-initialize GPU, declaring wedged!\n");
- i915_gem_set_wedged(dev_priv);
- }
- mutex_unlock(&dev->struct_mutex);
+ i915_gem_resume(dev_priv);
intel_guc_resume(dev_priv);
@@ -1754,8 +1747,6 @@ static int i915_drm_resume(struct drm_device *dev)
intel_opregion_notify_adapter(dev_priv, PCI_D0);
- intel_autoenable_gt_powersave(dev_priv);
-
enable_rpm_wakeref_asserts(dev_priv);
return 0;
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 593714fe5c5e..466ee055030b 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1388,7 +1388,6 @@ struct intel_gen6_power_mgmt {
struct intel_rps rps;
struct intel_rc6 rc6;
struct intel_llc_pstate llc_pstate;
- struct delayed_work autoenable_work;
};
/* defined intel_pm.c */
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index da560c1b037f..8941910d3602 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4800,23 +4800,38 @@ int i915_gem_suspend(struct drm_i915_private *dev_priv)
return ret;
}
-void i915_gem_resume(struct drm_i915_private *dev_priv)
+void i915_gem_resume(struct drm_i915_private *i915)
{
- struct drm_device *dev = &dev_priv->drm;
+ WARN_ON(i915->gt.awake);
- WARN_ON(dev_priv->gt.awake);
+ mutex_lock(&i915->drm.struct_mutex);
+ intel_uncore_forcewake_get(i915, FORCEWAKE_ALL);
- mutex_lock(&dev->struct_mutex);
- i915_gem_restore_gtt_mappings(dev_priv);
- i915_gem_restore_fences(dev_priv);
+ i915_gem_restore_gtt_mappings(i915);
+ i915_gem_restore_fences(i915);
/* As we didn't flush the kernel context before suspend, we cannot
* guarantee that the context image is complete. So let's just reset
* it and start again.
*/
- dev_priv->gt.resume(dev_priv);
+ i915->gt.resume(i915);
- mutex_unlock(&dev->struct_mutex);
+ if (i915_gem_init_hw(i915))
+ goto err_wedged;
+
+ /* Always reload a context for powersaving. */
+ if (i915_gem_switch_to_kernel_context(i915))
+ goto err_wedged;
+
+out_unlock:
+ intel_uncore_forcewake_put(i915, FORCEWAKE_ALL);
+ mutex_unlock(&i915->drm.struct_mutex);
+ return;
+
+err_wedged:
+ DRM_ERROR("failed to re-initialize GPU, declaring wedged!\n");
+ i915_gem_set_wedged(i915);
+ goto out_unlock;
}
void i915_gem_init_swizzling(struct drm_i915_private *dev_priv)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 00b488688042..76b12fb1a35f 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1881,7 +1881,6 @@ void intel_init_gt_powersave(struct drm_i915_private *dev_priv);
void intel_cleanup_gt_powersave(struct drm_i915_private *dev_priv);
void intel_sanitize_gt_powersave(struct drm_i915_private *dev_priv);
void intel_enable_gt_powersave(struct drm_i915_private *dev_priv);
-void intel_autoenable_gt_powersave(struct drm_i915_private *dev_priv);
void intel_disable_gt_powersave(struct drm_i915_private *dev_priv);
void intel_suspend_gt_powersave(struct drm_i915_private *dev_priv);
void gen6_rps_busy(struct drm_i915_private *dev_priv);
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 6e1358d4e764..308439dd89d4 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -7941,8 +7941,6 @@ void intel_init_gt_powersave(struct drm_i915_private *dev_priv)
rps->boost_freq = rps->max_freq;
mutex_unlock(&dev_priv->pcu_lock);
-
- intel_autoenable_gt_powersave(dev_priv);
}
void intel_cleanup_gt_powersave(struct drm_i915_private *dev_priv)
@@ -7967,9 +7965,6 @@ void intel_suspend_gt_powersave(struct drm_i915_private *dev_priv)
if (INTEL_GEN(dev_priv) < 6)
return;
- if (cancel_delayed_work_sync(&dev_priv->gt_pm.autoenable_work))
- intel_runtime_pm_put(dev_priv);
-
/* gen6_rps_idle() will be called later to disable interrupts */
}
@@ -8128,65 +8123,6 @@ void intel_enable_gt_powersave(struct drm_i915_private *dev_priv)
mutex_unlock(&dev_priv->pcu_lock);
}
-static void __intel_autoenable_gt_powersave(struct work_struct *work)
-{
- struct drm_i915_private *dev_priv =
- container_of(work,
- typeof(*dev_priv),
- gt_pm.autoenable_work.work);
- struct intel_engine_cs *rcs;
- struct drm_i915_gem_request *req;
-
- rcs = dev_priv->engine[RCS];
- if (rcs->last_retired_context)
- goto out;
-
- if (!rcs->init_context)
- goto out;
-
- mutex_lock(&dev_priv->drm.struct_mutex);
-
- req = i915_gem_request_alloc(rcs, dev_priv->kernel_context);
- if (IS_ERR(req))
- goto unlock;
-
- if (!i915_modparams.enable_execlists && i915_switch_context(req) == 0)
- rcs->init_context(req);
-
- /* Mark the device busy, calling intel_enable_gt_powersave() */
- i915_add_request(req);
-
-unlock:
- mutex_unlock(&dev_priv->drm.struct_mutex);
-out:
- intel_runtime_pm_put(dev_priv);
-}
-
-void intel_autoenable_gt_powersave(struct drm_i915_private *dev_priv)
-{
- if (IS_IRONLAKE_M(dev_priv)) {
- ironlake_enable_drps(dev_priv);
- intel_init_emon(dev_priv);
- } else if (INTEL_INFO(dev_priv)->gen >= 6) {
- /*
- * PCU communication is slow and this doesn't need to be
- * done at any specific time, so do this out of our fast path
- * to make resume and init faster.
- *
- * We depend on the HW RC6 power context save/restore
- * mechanism when entering D3 through runtime PM suspend. So
- * disable RPM until RPS/RC6 is properly setup. We can only
- * get here via the driver load/system resume/runtime resume
- * paths, so the _noresume version is enough (and in case of
- * runtime resume it's necessary).
- */
- if (queue_delayed_work(dev_priv->wq,
- &dev_priv->gt_pm.autoenable_work,
- round_jiffies_up_relative(HZ)))
- intel_runtime_pm_get_noresume(dev_priv);
- }
-}
-
static void ibx_init_clock_gating(struct drm_i915_private *dev_priv)
{
/*
@@ -9443,8 +9379,6 @@ void intel_pm_setup(struct drm_i915_private *dev_priv)
{
mutex_init(&dev_priv->pcu_lock);
- INIT_DELAYED_WORK(&dev_priv->gt_pm.autoenable_work,
- __intel_autoenable_gt_powersave);
atomic_set(&dev_priv->gt_pm.rps.num_waiters, 0);
dev_priv->runtime_pm.suspended = false;
--
2.15.0
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