Re: [PATCH v3 1/7] drm/atomic: Add new iterators over all state, v3.

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Op 17-01-17 om 00:11 schreef Laurent Pinchart:
> Hi Maarten,
>
> Thank you for the patch.
>
> On Monday 16 Jan 2017 10:37:38 Maarten Lankhorst wrote:
>> Add for_each_(old)(new)_(plane,connector,crtc)_in_state iterators to
>> replace the old for_each_xxx_in_state ones. This is useful for >1 flip
>> depth and getting rid of all xxx->state dereferences.
>>
>> This requires extra fixups done when committing a state after
>> duplicating, which in general isn't valid but is used by suspend/resume.
>> To handle these, introduce drm_atomic_helper_commit_duplicated_state
>> which performs those fixups before checking & committing the state.
>>
>> Changes since v1:
>> - Remove nonblock parameter for commit_duplicated_state.
>> Changes since v2:
>> - Use commit_duplicated_state for i915 load detection.
>> - Add WARN_ON(old_state != obj->state) before swapping.
>>
>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
>> ---
>>  drivers/gpu/drm/drm_atomic.c         |  6 +++
>>  drivers/gpu/drm/drm_atomic_helper.c  | 65 +++++++++++++++++++++++++----
>>  drivers/gpu/drm/i915/intel_display.c | 13 +++---
>>  include/drm/drm_atomic.h             | 81 +++++++++++++++++++++++++++++++--
>>  include/drm/drm_atomic_helper.h      |  2 +
>>  5 files changed, 149 insertions(+), 18 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
>> index 6414bcf7f41b..1c1cbf436717 100644
>> --- a/drivers/gpu/drm/drm_atomic.c
>> +++ b/drivers/gpu/drm/drm_atomic.c
>> @@ -275,6 +275,8 @@ drm_atomic_get_crtc_state(struct drm_atomic_state
>> *state, return ERR_PTR(-ENOMEM);
>>
>>  	state->crtcs[index].state = crtc_state;
>> +	state->crtcs[index].old_state = crtc->state;
>> +	state->crtcs[index].new_state = crtc_state;
>>  	state->crtcs[index].ptr = crtc;
>>  	crtc_state->state = state;
>>
>> @@ -691,6 +693,8 @@ drm_atomic_get_plane_state(struct drm_atomic_state
>> *state,
>>
>>  	state->planes[index].state = plane_state;
>>  	state->planes[index].ptr = plane;
>> +	state->planes[index].old_state = plane->state;
>> +	state->planes[index].new_state = plane_state;
>>  	plane_state->state = state;
>>
>>  	DRM_DEBUG_ATOMIC("Added [PLANE:%d:%s] %p state to %p\n",
>> @@ -1031,6 +1035,8 @@ drm_atomic_get_connector_state(struct drm_atomic_state
>> *state,
>>
>>  	drm_connector_reference(connector);
>>  	state->connectors[index].state = connector_state;
>> +	state->connectors[index].old_state = connector->state;
>> +	state->connectors[index].new_state = connector_state;
>>  	state->connectors[index].ptr = connector;
>>  	connector_state->state = state;
>>
>> diff --git a/drivers/gpu/drm/drm_atomic_helper.c
>> b/drivers/gpu/drm/drm_atomic_helper.c index b26e3419027e..d153e8a72921
>> 100644
>> --- a/drivers/gpu/drm/drm_atomic_helper.c
>> +++ b/drivers/gpu/drm/drm_atomic_helper.c
>> @@ -1971,11 +1971,11 @@ void drm_atomic_helper_swap_state(struct
>> drm_atomic_state *state, int i;
>>  	long ret;
>>  	struct drm_connector *connector;
>> -	struct drm_connector_state *conn_state;
>> +	struct drm_connector_state *conn_state, *old_conn_state;
>>  	struct drm_crtc *crtc;
>> -	struct drm_crtc_state *crtc_state;
>> +	struct drm_crtc_state *crtc_state, *old_crtc_state;
>>  	struct drm_plane *plane;
>> -	struct drm_plane_state *plane_state;
>> +	struct drm_plane_state *plane_state, *old_plane_state;
>>  	struct drm_crtc_commit *commit;
>>
>>  	if (stall) {
>> @@ -1999,13 +1999,17 @@ void drm_atomic_helper_swap_state(struct
>> drm_atomic_state *state, }
>>  	}
>>
>> -	for_each_connector_in_state(state, connector, conn_state, i) {
>> +	for_each_oldnew_connector_in_state(state, connector, old_conn_state,
>> conn_state, i) {
>> +		WARN_ON(connector->state != old_conn_state);
>> +
>>  		connector->state->state = state;
>>  		swap(state->connectors[i].state, connector->state);
>>  		connector->state->state = NULL;
>>  	}
>>
>> -	for_each_crtc_in_state(state, crtc, crtc_state, i) {
>> +	for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, crtc_state,
>> i) {
>> +		WARN_ON(crtc->state != old_crtc_state);
>> +
>>  		crtc->state->state = state;
>>  		swap(state->crtcs[i].state, crtc->state);
>>  		crtc->state->state = NULL;
>> @@ -2020,7 +2024,9 @@ void drm_atomic_helper_swap_state(struct
>> drm_atomic_state *state, }
>>  	}
>>
>> -	for_each_plane_in_state(state, plane, plane_state, i) {
>> +	for_each_oldnew_plane_in_state(state, plane, old_plane_state,
>> plane_state, i) {
>> +		WARN_ON(plane->state != old_plane_state);
>> +
>>  		plane->state->state = state;
>>  		swap(state->planes[i].state, plane->state);
>>  		plane->state->state = NULL;
>> @@ -2471,7 +2477,7 @@ EXPORT_SYMBOL(drm_atomic_helper_disable_all);
>>   *
>>   * See also:
>>   * drm_atomic_helper_duplicate_state(), drm_atomic_helper_disable_all(),
>> - * drm_atomic_helper_resume()
>> + * drm_atomic_helper_resume(), drm_atomic_helper_commit_duplicated_state()
>>   */
>>  struct drm_atomic_state *drm_atomic_helper_suspend(struct drm_device *dev)
>>  {
>> @@ -2512,6 +2518,47 @@ struct drm_atomic_state
>> *drm_atomic_helper_suspend(struct drm_device *dev)
>> EXPORT_SYMBOL(drm_atomic_helper_suspend);
>>
>>  /**
>> + * drm_atomic_helper_commit_duplicated_state - commit duplicated state
>> + * @state: duplicated atomic state to commit
>> + * @ctx: pointer to acquire_ctx to use for commit.
>> + *
>> + * The state returned by drm_atomic_helper_duplicate_state() and
>> + * drm_atomic_helper_suspend() is partially invalid, and needs to
>> + * be fixed up before commit.
> Can't you fix the state in drm_atomic_helper_suspend() to avoid the need for 
> this function ?
We would have to fix up other areas that duplicate state too, like i915 suspend and load detect. This means moving it to a helper.

It was my original approach, but Daniel preferred this approach.
> Apart from this the patch looks good to me. I don't like the fact that we now 
> have two sets of states though (state and old_state/new_state). I understand 
> that you'd like to address this as part of a separate patch series, which I'm 
> fine with to avoid delaying this one, but I think we should address this 
> sooner rather than latter, or the API will become very confusing. Yes, that 
> means mass-patching drivers I'm afraid. Could you confirm that this is your 
> plan ?
Yes, working on it.
>> + * Returns:
>> + * 0 on success or a negative error code on failure.
>> + *
>> + * See also:
>> + * drm_atomic_helper_suspend()
>> + */
>> +int drm_atomic_helper_commit_duplicated_state(struct drm_atomic_state
>> *state,
>> +					      struct drm_modeset_acquire_ctx
>> *ctx)
>> +{
>> +	int i;
>> +	struct drm_plane *plane;
>> +	struct drm_plane_state *plane_state;
>> +	struct drm_connector *connector;
>> +	struct drm_connector_state *conn_state;
>> +	struct drm_crtc *crtc;
>> +	struct drm_crtc_state *crtc_state;
>> +
>> +	state->acquire_ctx = ctx;
>> +
>> +	for_each_new_plane_in_state(state, plane, plane_state, i)
>> +		state->planes[i].old_state = plane->state;
>> +
>> +	for_each_new_crtc_in_state(state, crtc, crtc_state, i)
>> +		state->crtcs[i].old_state = crtc->state;
>> +
>> +	for_each_new_connector_in_state(state, connector, conn_state, i)
>> +		state->connectors[i].old_state = connector->state;
>> +
>> +	return drm_atomic_commit(state);
>> +}
>> +EXPORT_SYMBOL(drm_atomic_helper_commit_duplicated_state);
>> +
>> +/**
>>   * drm_atomic_helper_resume - subsystem-level resume helper
>>   * @dev: DRM device
>>   * @state: atomic state to resume to
>> @@ -2534,9 +2581,9 @@ int drm_atomic_helper_resume(struct drm_device *dev,
>>  	int err;
>>
>>  	drm_mode_config_reset(dev);
>> +
>>  	drm_modeset_lock_all(dev);
>> -	state->acquire_ctx = config->acquire_ctx;
>> -	err = drm_atomic_commit(state);
>> +	err = drm_atomic_helper_commit_duplicated_state(state,
>> config->acquire_ctx);
>> 	drm_modeset_unlock_all(dev);
>>
>>  	return err;
>> diff --git a/drivers/gpu/drm/i915/intel_display.c
>> b/drivers/gpu/drm/i915/intel_display.c index f523256ef77c..74da1c380b32
>> 100644
>> --- a/drivers/gpu/drm/i915/intel_display.c
>> +++ b/drivers/gpu/drm/i915/intel_display.c
>> @@ -3488,7 +3488,8 @@ static void intel_update_primary_planes(struct
>> drm_device *dev)
>>
>>  static int
>>  __intel_display_resume(struct drm_device *dev,
>> -		       struct drm_atomic_state *state)
>> +		       struct drm_atomic_state *state,
>> +		       struct drm_modeset_acquire_ctx *ctx)
>>  {
>>  	struct drm_crtc_state *crtc_state;
>>  	struct drm_crtc *crtc;
>> @@ -3512,7 +3513,7 @@ __intel_display_resume(struct drm_device *dev,
>>  	/* ignore any reset values/BIOS leftovers in the WM registers */
>>  	to_intel_atomic_state(state)->skip_intermediate_wm = true;
>>
>> -	ret = drm_atomic_commit(state);
>> +	ret = drm_atomic_helper_commit_duplicated_state(state, ctx);
>>
>>  	WARN_ON(ret == -EDEADLK);
>>  	return ret;
>> @@ -3606,7 +3607,7 @@ void intel_finish_reset(struct drm_i915_private
>> *dev_priv) */
>>  			intel_update_primary_planes(dev);
>>  		} else {
>> -			ret = __intel_display_resume(dev, state);
>> +			ret = __intel_display_resume(dev, state, ctx);
>>  			if (ret)
>>  				DRM_ERROR("Restoring old state failed with 
> %i\n", ret);
>>  		}
>> @@ -3626,7 +3627,7 @@ void intel_finish_reset(struct drm_i915_private
>> *dev_priv) dev_priv->display.hpd_irq_setup(dev_priv);
>>  		spin_unlock_irq(&dev_priv->irq_lock);
>>
>> -		ret = __intel_display_resume(dev, state);
>> +		ret = __intel_display_resume(dev, state, ctx);
>>  		if (ret)
>>  			DRM_ERROR("Restoring old state failed with %i\n", 
> ret);
>> @@ -11327,7 +11328,7 @@ void intel_release_load_detect_pipe(struct
>> drm_connector *connector, if (!state)
>>  		return;
>>
>> -	ret = drm_atomic_commit(state);
>> +	ret = drm_atomic_helper_commit_duplicated_state(state, ctx);
>>  	if (ret)
>>  		DRM_DEBUG_KMS("Couldn't release load detect pipe: %i\n", ret);
>>  	drm_atomic_state_put(state);
>> @@ -17210,7 +17211,7 @@ void intel_display_resume(struct drm_device *dev)
>>  	}
>>
>>  	if (!ret)
>> -		ret = __intel_display_resume(dev, state);
>> +		ret = __intel_display_resume(dev, state, &ctx);
>>
>>  	drm_modeset_drop_locks(&ctx);
>>  	drm_modeset_acquire_fini(&ctx);
>> diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
>> index f96220ed4004..6062e7f27325 100644
>> --- a/include/drm/drm_atomic.h
>> +++ b/include/drm/drm_atomic.h
>> @@ -137,12 +137,12 @@ struct drm_crtc_commit {
>>
>>  struct __drm_planes_state {
>>  	struct drm_plane *ptr;
>> -	struct drm_plane_state *state;
>> +	struct drm_plane_state *state, *old_state, *new_state;
>>  };
>>
>>  struct __drm_crtcs_state {
>>  	struct drm_crtc *ptr;
>> -	struct drm_crtc_state *state;
>> +	struct drm_crtc_state *state, *old_state, *new_state;
>>  	struct drm_crtc_commit *commit;
>>  	s64 __user *out_fence_ptr;
>>  	unsigned last_vblank_count;
>> @@ -150,7 +150,7 @@ struct __drm_crtcs_state {
>>
>>  struct __drm_connnectors_state {
>>  	struct drm_connector *ptr;
>> -	struct drm_connector_state *state;
>> +	struct drm_connector_state *state, *old_state, *new_state;
>>  };
>>
>>  /**
>> @@ -397,6 +397,31 @@ void drm_state_dump(struct drm_device *dev, struct
>> drm_printer *p); (__i)++)							
> \
>>  		for_each_if (connector)
>>
>> +#define for_each_oldnew_connector_in_state(__state, connector,
>> old_connector_state, new_connector_state, __i) \
>> +	for ((__i) = 0;								
> \
>> +	     (__i) < (__state)->num_connector &&				
> \
>> +	     ((connector) = (__state)->connectors[__i].ptr,			
> \
>> +	     (old_connector_state) = (__state)->connectors[__i].old_state,	
> \
>> +	     (new_connector_state) = (__state)->connectors[__i].new_state, 1); 
> 	\
>> +	     (__i)++)							\
>> +		for_each_if (connector)
>> +
>> +#define for_each_old_connector_in_state(__state, connector,
>> old_connector_state, __i) \ +	for ((__i) = 0;					
> 			\
>> +	     (__i) < (__state)->num_connector &&				
> \
>> +	     ((connector) = (__state)->connectors[__i].ptr,			
> \
>> +	     (old_connector_state) = (__state)->connectors[__i].old_state, 1); 
> 	\
>> +	     (__i)++)							\
>> +		for_each_if (connector)
>> +
>> +#define for_each_new_connector_in_state(__state, connector,
>> new_connector_state, __i) \ +	for ((__i) = 0;					
> 			\
>> +	     (__i) < (__state)->num_connector &&				
> \
>> +	     ((connector) = (__state)->connectors[__i].ptr,			
> \
>> +	     (new_connector_state) = (__state)->connectors[__i].new_state, 1); 
> 	\
>> +	     (__i)++)							\
>> +		for_each_if (connector)
>> +
>>  #define for_each_crtc_in_state(__state, crtc, crtc_state, __i)	\
>>  	for ((__i) = 0;						\
>>  	     (__i) < (__state)->dev->mode_config.num_crtc &&	\
>> @@ -405,6 +430,31 @@ void drm_state_dump(struct drm_device *dev, struct
>> drm_printer *p); (__i)++)						\
>>  		for_each_if (crtc_state)
>>
>> +#define for_each_oldnew_crtc_in_state(__state, crtc, old_crtc_state,
>> new_crtc_state, __i) \ +	for ((__i) = 0;					
> 		\
>> +	     (__i) < (__state)->dev->mode_config.num_crtc &&		\
>> +	     ((crtc) = (__state)->crtcs[__i].ptr,			\
>> +	     (old_crtc_state) = (__state)->crtcs[__i].old_state,	\
>> +	     (new_crtc_state) = (__state)->crtcs[__i].new_state, 1);	\
>> +	     (__i)++)							\
>> +		for_each_if (crtc)
>> +
>> +#define for_each_old_crtc_in_state(__state, crtc, old_crtc_state, __i)	
> \
>> +	for ((__i) = 0;							\
>> +	     (__i) < (__state)->dev->mode_config.num_crtc &&		\
>> +	     ((crtc) = (__state)->crtcs[__i].ptr,			\
>> +	     (old_crtc_state) = (__state)->crtcs[__i].old_state, 1);	\
>> +	     (__i)++)							\
>> +		for_each_if (crtc)
>> +
>> +#define for_each_new_crtc_in_state(__state, crtc, new_crtc_state, __i)	
> \
>> +	for ((__i) = 0;							\
>> +	     (__i) < (__state)->dev->mode_config.num_crtc &&		\
>> +	     ((crtc) = (__state)->crtcs[__i].ptr,			\
>> +	     (new_crtc_state) = (__state)->crtcs[__i].new_state, 1);	\
>> +	     (__i)++)							\
>> +		for_each_if (crtc)
>> +
>>  #define for_each_plane_in_state(__state, plane, plane_state, __i)		
> \
>>  	for ((__i) = 0;							\
>>  	     (__i) < (__state)->dev->mode_config.num_total_plane &&	\
>> @@ -413,6 +463,31 @@ void drm_state_dump(struct drm_device *dev, struct
>> drm_printer *p); (__i)++)							
> \
>>  		for_each_if (plane_state)
>>
>> +#define for_each_oldnew_plane_in_state(__state, plane, old_plane_state,
>> new_plane_state, __i) \ +	for ((__i) = 0;					
> 		\
>> +	     (__i) < (__state)->dev->mode_config.num_total_plane &&	\
>> +	     ((plane) = (__state)->planes[__i].ptr,			\
>> +	     (old_plane_state) = (__state)->planes[__i].old_state,	\
>> +	     (new_plane_state) = (__state)->planes[__i].new_state, 1);	\
>> +	     (__i)++)							\
>> +		for_each_if (plane)
>> +
>> +#define for_each_old_plane_in_state(__state, plane, old_plane_state, __i) \
>> +	for ((__i) = 0;							\
>> +	     (__i) < (__state)->dev->mode_config.num_total_plane &&	\
>> +	     ((plane) = (__state)->planes[__i].ptr,			\
>> +	     (old_plane_state) = (__state)->planes[__i].old_state, 1);	\
>> +	     (__i)++)							\
>> +		for_each_if (plane)
>> +
>> +#define for_each_new_plane_in_state(__state, plane, new_plane_state, __i) \
>> +	for ((__i) = 0;							\
>> +	     (__i) < (__state)->dev->mode_config.num_total_plane &&	\
>> +	     ((plane) = (__state)->planes[__i].ptr,			\
>> +	     (new_plane_state) = (__state)->planes[__i].new_state, 1);	\
>> +	     (__i)++)							\
>> +		for_each_if (plane)
>> +
>>  /**
>>   * drm_atomic_crtc_needs_modeset - compute combined modeset need
>>   * @state: &drm_crtc_state for the CRTC
>> diff --git a/include/drm/drm_atomic_helper.h
>> b/include/drm/drm_atomic_helper.h index 9afcd3810785..2c4549e98c16 100644
>> --- a/include/drm/drm_atomic_helper.h
>> +++ b/include/drm/drm_atomic_helper.h
>> @@ -105,6 +105,8 @@ int __drm_atomic_helper_set_config(struct drm_mode_set
>> *set, int drm_atomic_helper_disable_all(struct drm_device *dev,
>>  				  struct drm_modeset_acquire_ctx *ctx);
>>  struct drm_atomic_state *drm_atomic_helper_suspend(struct drm_device *dev);
>> +int drm_atomic_helper_commit_duplicated_state(struct drm_atomic_state
>> *state,
>> +					      struct drm_modeset_acquire_ctx
>> *ctx);
>>  int drm_atomic_helper_resume(struct drm_device *dev,
>>  			     struct drm_atomic_state *state);


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