drm/i915: Enable RC6 immediately

Now that PCU communication is reasonably fast, we do not need to defer
RC6 initialisation to a workqueue.

References: https://bugs.freedesktop.org/show_bug.cgi?id=97017
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 83afdd0..84e4018 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1630,7 +1630,6 @@ static int i915_drm_resume(struct drm_device *dev)
 
        intel_opregion_notify_adapter(dev_priv, PCI_D0);
 
-       intel_autoenable_gt_powersave(dev_priv);
        drm_kms_helper_poll_enable(dev);
 
        enable_rpm_wakeref_asserts(dev_priv);
@@ -1812,7 +1811,8 @@ int i915_reset(struct drm_i915_private *dev_priv)
         * previous concerns that it doesn't respond well to some forms
         * of re-init after reset.
         */
-       intel_autoenable_gt_powersave(dev_priv);
+       if (INTEL_GEN(dev_priv) > 5)
+               intel_enable_gt_powersave(dev_priv);
 
        return 0;
 
@@ -2440,6 +2440,7 @@ static int intel_runtime_resume(struct device *device)
        i915_gem_init_swizzling(dev);
 
        intel_runtime_pm_enable_interrupts(dev_priv);
+       intel_enable_gt_powersave(dev_priv);
 
        /*
         * On VLV/CHV display interrupts are part of the display

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index c97724d..52be86e 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1192,7 +1192,6 @@ struct intel_gen6_power_mgmt {
        bool client_boost;
 
        bool enabled;
-       struct delayed_work autoenable_work;
        unsigned boosts;
 
        /* manual wa residency calculations */

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 40047eb..90b9f46 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4355,8 +4355,6 @@ i915_gem_suspend(struct drm_device *dev)
        struct drm_i915_private *dev_priv = to_i915(dev);
        int ret = 0;
 
-       intel_suspend_gt_powersave(dev_priv);
-
        mutex_lock(&dev->struct_mutex);
 
        /* We have to flush all the executing contexts to main memory so

diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index 60a3a34..b20b004 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -405,7 +405,6 @@ static void i915_gem_mark_busy(const struct intel_engine_cs *engine)
        intel_runtime_pm_get_noresume(dev_priv);
        dev_priv->gt.awake = true;
 
-       intel_enable_gt_powersave(dev_priv);
        i915_update_gfx_val(dev_priv);
        if (INTEL_GEN(dev_priv) >= 6)
                gen6_rps_busy(dev_priv);

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 78beb7e..0011609 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -15502,6 +15502,7 @@ void intel_modeset_init_hw(struct drm_device *dev)
        dev_priv->atomic_cdclk_freq = dev_priv->cdclk_freq;
 
        intel_init_clock_gating(dev);
+       intel_enable_gt_powersave(dev_priv);
 }
 
 /*

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index e74d851..8bb98ec 100644 (file)
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1691,12 +1691,9 @@ void intel_pm_setup(struct drm_device *dev);
 void intel_gpu_ips_init(struct drm_i915_private *dev_priv);
 void intel_gpu_ips_teardown(void);
 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 intel_cleanup_gt_powersave(struct drm_i915_private *dev_priv);
 void gen6_rps_busy(struct drm_i915_private *dev_priv);
 void gen6_rps_reset_ei(struct drm_i915_private *dev_priv);
 void gen6_rps_idle(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 64d628c..45753e1 100644 (file)
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -6526,8 +6526,6 @@ void intel_init_gt_powersave(struct drm_i915_private *dev_priv)
        dev_priv->rps.boost_freq = dev_priv->rps.max_freq;
 
        mutex_unlock(&dev_priv->rps.hw_lock);
-
-       intel_autoenable_gt_powersave(dev_priv);
 }
 
 void intel_cleanup_gt_powersave(struct drm_i915_private *dev_priv)
@@ -6541,31 +6539,10 @@ void intel_cleanup_gt_powersave(struct drm_i915_private *dev_priv)
                intel_runtime_pm_put(dev_priv);
 }
 
-/**
- * intel_suspend_gt_powersave - suspend PM work and helper threads
- * @dev_priv: i915 device
- *
- * We don't want to disable RC6 or other features here, we just want
- * to make sure any work we've queued has finished and won't bother
- * us while we're suspended.
- */
-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->rps.autoenable_work))
-               intel_runtime_pm_put(dev_priv);
-
-       /* gen6_rps_idle() will be called later to disable interrupts */
-}
-
 void intel_sanitize_gt_powersave(struct drm_i915_private *dev_priv)
 {
        dev_priv->rps.enabled = true; /* force disabling */
        intel_disable_gt_powersave(dev_priv);
-
-       gen6_reset_rps_interrupts(dev_priv);
 }
 
 void intel_disable_gt_powersave(struct drm_i915_private *dev_priv)
@@ -6590,13 +6567,12 @@ void intel_disable_gt_powersave(struct drm_i915_private *dev_priv)
 
        dev_priv->rps.enabled = false;
        mutex_unlock(&dev_priv->rps.hw_lock);
+
+       gen6_reset_rps_interrupts(dev_priv);
 }
 
 void intel_enable_gt_powersave(struct drm_i915_private *dev_priv)
 {
-       /* We shouldn't be disabling as we submit, so this should be less
-        * racy than it appears!
-        */
        if (READ_ONCE(dev_priv->rps.enabled))
                return;
 
@@ -6632,75 +6608,9 @@ void intel_enable_gt_powersave(struct drm_i915_private *dev_priv)
        WARN_ON(dev_priv->rps.efficient_freq < dev_priv->rps.min_freq);
        WARN_ON(dev_priv->rps.efficient_freq > dev_priv->rps.max_freq);
 
-       dev_priv->rps.enabled = true;
        mutex_unlock(&dev_priv->rps.hw_lock);
 }
 
-static void __intel_autoenable_gt_powersave(struct work_struct *work)
-{
-       struct drm_i915_private *dev_priv =
-               container_of(work, typeof(*dev_priv), rps.autoenable_work.work);
-       struct intel_engine_cs *rcs;
-       struct drm_i915_gem_request *req;
-
-       if (READ_ONCE(dev_priv->rps.enabled))
-               goto out;
-
-       rcs = &dev_priv->engine[RCS];
-       if (rcs->last_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.enable_execlists && i915_switch_context(req) == 0)
-               rcs->init_context(req);
-
-       /* Mark the device busy, calling intel_enable_gt_powersave() */
-       i915_add_request_no_flush(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 (READ_ONCE(dev_priv->rps.enabled))
-               return;
-
-       if (IS_IRONLAKE_M(dev_priv)) {
-               ironlake_enable_drps(dev_priv);
-               mutex_lock(&dev_priv->drm.struct_mutex);
-               intel_init_emon(dev_priv);
-               mutex_unlock(&dev_priv->drm.struct_mutex);
-       } 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->rps.autoenable_work,
-                                      round_jiffies_up_relative(HZ)))
-                       intel_runtime_pm_get_noresume(dev_priv);
-       }
-}
-
 static void ibx_init_clock_gating(struct drm_device *dev)
 {
        struct drm_i915_private *dev_priv = to_i915(dev);
@@ -7806,8 +7716,6 @@ void intel_pm_setup(struct drm_device *dev)
        mutex_init(&dev_priv->rps.hw_lock);
        spin_lock_init(&dev_priv->rps.client_lock);
 
-       INIT_DELAYED_WORK(&dev_priv->rps.autoenable_work,
-                         __intel_autoenable_gt_powersave);
        INIT_LIST_HEAD(&dev_priv->rps.clients);
 
        dev_priv->pm.suspended = false;

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 43f8339..2d4bca4 100644 (file)
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -435,7 +435,7 @@ void intel_uncore_sanitize(struct drm_i915_private *dev_priv)
        i915.enable_rc6 = sanitize_rc6_option(dev_priv, i915.enable_rc6);
 
        /* BIOS often leaves RC6 enabled, but disable it for hw init */
-       intel_sanitize_gt_powersave(dev_priv);
+       intel_disable_gt_powersave(dev_priv);
 }
 
 static void __intel_uncore_forcewake_get(struct drm_i915_private *dev_priv,