On Wed, Aug 09, 2017 at 03:53:47PM +0530, Sagar Arun Kamble wrote:
> Teardown of GuC HW/SW state was not properly done in unload path.
> During unload, we can rely on intel_guc_reset_prepare being done
> as part of i915_gem_suspend for disabling GuC interfaces.
> We will have to disable GuC submission prior to suspend as that involves
> communication with GuC to destroy doorbell. So intel_uc_fini_hw has to
> be called as part of i915_gem_suspend during unload as that really
> takes care of finishing the GuC operations. Created new parameter for
> i915_gem_suspend to handle unload/suspend path w.r.t gem and GuC suspend.
> GuC related allocations are cleaned up as part of intel_uc_cleanup_hw.
>
> Cc: Chris Wilson <ch...@chris-wilson.co.uk>
> Cc: Michal Wajdeczko <michal.wajdec...@intel.com>
> Cc: Daniele Ceraolo Spurio <daniele.ceraolospu...@intel.com>
> Signed-off-by: Sagar Arun Kamble <sagar.a.kam...@intel.com>
> ---
> drivers/gpu/drm/i915/i915_drv.c | 8 ++++----
> drivers/gpu/drm/i915/i915_drv.h | 3 ++-
> drivers/gpu/drm/i915/i915_gem.c | 8 ++++++--
> drivers/gpu/drm/i915/intel_guc.c | 13 +++++++++++++
> drivers/gpu/drm/i915/intel_guc.h | 1 +
> drivers/gpu/drm/i915/intel_uc.c | 14 +++++---------
> drivers/gpu/drm/i915/intel_uc.h | 1 +
> 7 files changed, 32 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 218a8e1..c3fb73f 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -599,7 +599,7 @@ static void i915_gem_fini(struct drm_i915_private
> *dev_priv)
> i915_gem_drain_workqueue(dev_priv);
>
> mutex_lock(&dev_priv->drm.struct_mutex);
> - intel_uc_fini_hw(dev_priv);
> + intel_uc_cleanup_hw(dev_priv);
> i915_gem_cleanup_engines(dev_priv);
> i915_gem_contexts_fini(dev_priv);
> i915_gem_cleanup_userptr(dev_priv);
> @@ -680,7 +680,7 @@ static int i915_load_modeset_init(struct drm_device *dev)
> return 0;
>
> cleanup_gem:
> - if (i915_gem_suspend(dev_priv))
> + if (i915_gem_suspend(dev_priv, true))
> DRM_ERROR("failed to idle hardware; continuing to unload!\n");
> i915_gem_fini(dev_priv);
> cleanup_uc:
> @@ -1373,7 +1373,7 @@ void i915_driver_unload(struct drm_device *dev)
>
> i915_driver_unregister(dev_priv);
>
> - if (i915_gem_suspend(dev_priv))
> + if (i915_gem_suspend(dev_priv, true))
> DRM_ERROR("failed to idle hardware; continuing to unload!\n");
>
> intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
> @@ -1518,7 +1518,7 @@ static int i915_drm_suspend(struct drm_device *dev)
>
> pci_save_state(pdev);
>
> - error = i915_gem_suspend(dev_priv);
> + error = i915_gem_suspend(dev_priv, false);
> if (error) {
> dev_err(&pdev->dev,
> "GEM idle failed, resume might fail\n");
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 085647a..dd6a3ff 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -3547,7 +3547,8 @@ void i915_gem_reset_engine(struct intel_engine_cs
> *engine,
> void i915_gem_cleanup_engines(struct drm_i915_private *dev_priv);
> int i915_gem_wait_for_idle(struct drm_i915_private *dev_priv,
> unsigned int flags);
> -int __must_check i915_gem_suspend(struct drm_i915_private *dev_priv);
> +int __must_check i915_gem_suspend(struct drm_i915_private *dev_priv,
> + bool unload);
> void i915_gem_resume(struct drm_i915_private *dev_priv);
> int i915_gem_fault(struct vm_fault *vmf);
> int i915_gem_object_wait(struct drm_i915_gem_object *obj,
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index e118b9a..1b1b9c7 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -4525,7 +4525,7 @@ void i915_gem_sanitize(struct drm_i915_private *i915)
> }
> }
>
> -int i915_gem_suspend(struct drm_i915_private *dev_priv)
> +int i915_gem_suspend(struct drm_i915_private *dev_priv, bool unload)
This extra param is not very intuitive.
Can we have two public functions:
int i915_gem_suspend(struct drm_i915_private *dev_priv)
int i915_gem_unload(struct drm_i915_private *dev_priv)
> {
> struct drm_device *dev = &dev_priv->drm;
> int ret;
> @@ -4572,7 +4572,11 @@ int i915_gem_suspend(struct drm_i915_private *dev_priv)
> WARN_ON(dev_priv->gt.awake);
> WARN_ON(!intel_engines_are_idle(dev_priv));
>
> - intel_guc_system_suspend(&dev_priv->guc);
> + /* Handle GuC suspension in case of unloading/system suspend */
> + if (unload)
> + intel_uc_fini_hw(dev_priv);
> + else
> + intel_guc_system_suspend(&dev_priv->guc);
>
> /*
> * Neither the BIOS, ourselves or any other kernel
> diff --git a/drivers/gpu/drm/i915/intel_guc.c
> b/drivers/gpu/drm/i915/intel_guc.c
> index 3777659..f4ddfbb 100644
> --- a/drivers/gpu/drm/i915/intel_guc.c
> +++ b/drivers/gpu/drm/i915/intel_guc.c
> @@ -313,3 +313,16 @@ int intel_guc_system_resume(struct intel_guc *guc)
> */
> return ret;
> }
> +
> +void intel_guc_fini(struct intel_guc *guc)
> +{
> + struct drm_i915_private *dev_priv = guc_to_i915(guc);
> + struct drm_device *dev = &dev_priv->drm;
> +
> + if (i915.enable_guc_submission) {
> + mutex_lock(&dev->struct_mutex);
> + i915_guc_submission_disable(dev_priv);
> + mutex_unlock(&dev->struct_mutex);
> + intel_guc_reset_prepare(&dev_priv->guc);
You can use "guc" param here.
> + }
> +}
> diff --git a/drivers/gpu/drm/i915/intel_guc.h
> b/drivers/gpu/drm/i915/intel_guc.h
> index e9664bf..ed3d202 100644
> --- a/drivers/gpu/drm/i915/intel_guc.h
> +++ b/drivers/gpu/drm/i915/intel_guc.h
> @@ -161,6 +161,7 @@ struct intel_guc {
> int intel_guc_runtime_resume(struct intel_guc *guc);
> int intel_guc_system_suspend(struct intel_guc *guc);
> int intel_guc_system_resume(struct intel_guc *guc);
> +void intel_guc_fini(struct intel_guc *guc);
>
> static inline int intel_guc_send(struct intel_guc *guc, const u32 *action,
> u32 len)
> diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
> index 95af45f..e6b9330 100644
> --- a/drivers/gpu/drm/i915/intel_uc.c
> +++ b/drivers/gpu/drm/i915/intel_uc.c
> @@ -363,20 +363,16 @@ int intel_uc_init_hw(struct drm_i915_private *dev_priv)
>
> void intel_uc_fini_hw(struct drm_i915_private *dev_priv)
> {
> + intel_guc_fini(&dev_priv->guc);
> +}
> +
> +void intel_uc_cleanup_hw(struct drm_i915_private *dev_priv)
I'm little confused with above names.
Is there matching "prepare" function ?
What is the expected order of calls ?
early_init/init/prepare/cleanup/fini ?
> +{
> guc_free_load_err_log(&dev_priv->guc);
>
> if (!i915.enable_guc_loading)
> return;
>
> if (i915.enable_guc_submission)
> - i915_guc_submission_disable(dev_priv);
> -
> - guc_disable_communication(&dev_priv->guc);
> -
> - if (i915.enable_guc_submission) {
> - gen9_disable_guc_interrupts(dev_priv);
> i915_guc_submission_fini(dev_priv);
> - }
> -
> - i915_ggtt_disable_guc(dev_priv);
> }
> diff --git a/drivers/gpu/drm/i915/intel_uc.h b/drivers/gpu/drm/i915/intel_uc.h
> index 13460f8..bfe5639 100644
> --- a/drivers/gpu/drm/i915/intel_uc.h
> +++ b/drivers/gpu/drm/i915/intel_uc.h
> @@ -97,5 +97,6 @@ struct intel_uc_fw {
> void intel_uc_fini_fw(struct drm_i915_private *dev_priv);
> int intel_uc_init_hw(struct drm_i915_private *dev_priv);
> void intel_uc_fini_hw(struct drm_i915_private *dev_priv);
> +void intel_uc_cleanup_hw(struct drm_i915_private *dev_priv);
>
> #endif
> --
> 1.9.1
>
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