Re: [Freedreno] [DPU PATCH 1/4] drm/msm/dpu: add atomic private object to dpu kms

[Jeykumar Sankaran <jsanka@codeaurora.org>]

On 2018-06-13 09:29, Jordan Crouse wrote:
> On Tue, Jun 12, 2018 at 06:17:44PM -0700, Jeykumar Sankaran wrote:
>> Subclass drm private state for DPU for handling driver
>> specific data. Adds atomic private object and private object
>> lock to dpu kms. Provides helper function to retrieve DPU
>> private data from current atomic state.
>> 
>> Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>
>> ---
>>  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 66
> +++++++++++++++++++++++++++++++++
>>  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h | 15 ++++++++
>>  2 files changed, 81 insertions(+)
>> 
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
>> index fe614c0..a4ab783 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
>> @@ -1076,6 +1076,10 @@ static void dpu_kms_destroy(struct msm_kms 
>> *kms)
>> 
>>  	dpu_kms = to_dpu_kms(kms);
>>  	_dpu_kms_hw_destroy(dpu_kms);
>> +
>> +	drm_atomic_private_obj_fini(&dpu_kms->priv_obj);
>> +	drm_modeset_lock_fini(&dpu_kms->priv_obj_lock);
>> +
>>  }
>> 
>>  static void dpu_kms_preclose(struct msm_kms *kms, struct drm_file
> *file)
>> @@ -1618,10 +1622,59 @@ static int dpu_kms_hw_init(struct msm_kms 
>> *kms)
>>  	return rc;
>>  }
>> 
>> +struct dpu_private_state *dpu_get_private_state(struct 
>> drm_atomic_state
> *state)
>> +{
>> +	struct msm_drm_private *priv = state->dev->dev_private;
>> +	struct dpu_kms *dpu_kms = to_dpu_kms(priv->kms);
>> +	struct drm_private_state *priv_state;
>> +	int rc = 0;
>> +
>> +	rc = drm_modeset_lock(&dpu_kms->priv_obj_lock,
> state->acquire_ctx);
>> +	if (rc)
>> +		return ERR_PTR(rc);
>> +
>> +	priv_state = drm_atomic_get_private_obj_state(state,
>> +			&dpu_kms->priv_obj);
>> +	if (!priv_state)
>> +		return NULL;
> 
> I'll have to see later when this function is used, but I generally 
> don't
> like it
> when functions return both ERR_PTR and NULL on error but I'm leaving 
> open
> the
> possibility that this could NULL for legitimate reasons. If not, please
> convert
> to a ERR_PTR.
> 
I see drm_atomic_get_private_obj_state returns ERR_PTR(-ENOMEM) on error 
cases. So I should
be good with IS_ERR/ERR_PTR.
>> +	return to_dpu_private_state(priv_state);
>> +}
>> +
>> +static struct drm_private_state *
>> +dpu_private_obj_duplicate_state(struct drm_private_obj *obj)
>> +{
>> +	struct dpu_private_state *dpu_priv_state;
>> +
>> +	dpu_priv_state = kmemdup(obj->state,
>> +			sizeof(*dpu_priv_state), GFP_KERNEL);
>> +	if (!dpu_priv_state)
>> +		return NULL;
>> +
>> +	__drm_atomic_helper_private_obj_duplicate_state(obj,
>> +			&dpu_priv_state->base);
>> +
>> +	return &dpu_priv_state->base;
>> +}
>> +
>> +static void dpu_private_obj_destroy_state(struct drm_private_obj 
>> *obj,
>> +				      struct drm_private_state *state)
>> +{
>> +	struct dpu_private_state *dpu_priv_state =
> to_dpu_private_state(state);
>> +
>> +	kfree(dpu_priv_state);
>> +}
>> +
>> +static const struct drm_private_state_funcs priv_obj_funcs = {
>> +	.atomic_duplicate_state = dpu_private_obj_duplicate_state,
>> +	.atomic_destroy_state = dpu_private_obj_destroy_state,
>> +};
>> +
>>  struct msm_kms *dpu_kms_init(struct drm_device *dev)
>>  {
>>  	struct msm_drm_private *priv;
>>  	struct dpu_kms *dpu_kms;
>> +	struct dpu_private_state *dpu_priv_state;
>>  	int irq;
>> 
>>  	if (!dev || !dev->dev_private) {
>> @@ -1639,6 +1692,19 @@ struct msm_kms *dpu_kms_init(struct drm_device
> *dev)
>>  	}
>>  	dpu_kms->base.irq = irq;
>> 
>> +	/* Initialize private obj's */
>> +	drm_modeset_lock_init(&dpu_kms->priv_obj_lock);
>> +
>> +	dpu_priv_state = kzalloc(sizeof(*dpu_priv_state), GFP_KERNEL);
>> +	if (!dpu_priv_state) {
>> +		DPU_ERROR("failed to allocate dpu priv obj\n");
> 
> We don't need an error message on memory failure - you will have no
> problem
> identifying when this went boom if it goes boom.
> 
Will remove
>> +		return ERR_PTR(-ENOMEM);
>> +	}
>> +
>> +	drm_atomic_private_obj_init(&dpu_kms->priv_obj,
>> +				    &dpu_priv_state->base,
>> +				    &priv_obj_funcs);
>> +
>>  	return &dpu_kms->base;
>>  }
>> 
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
>> index 046e6f7..924d8967 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
>> @@ -190,6 +190,9 @@ struct dpu_kms {
>>  	struct dpu_hw_vbif *hw_vbif[VBIF_MAX];
>>  	struct dpu_hw_mdp *hw_mdp;
>> 
>> +	struct drm_modeset_lock priv_obj_lock;
>> +	struct drm_private_obj priv_obj;
>> +
>>  	bool has_danger_ctrl;
>> 
>>  	struct platform_device *pdev;
>> @@ -197,12 +200,24 @@ struct dpu_kms {
>>  	struct dss_module_power mp;
>>  };
>> 
>> +struct dpu_private_state {
>> +	struct drm_private_state base;
>> +};
>> +
>>  struct vsync_info {
>>  	u32 frame_count;
>>  	u32 line_count;
>>  };
>> 
>>  #define to_dpu_kms(x) container_of(x, struct dpu_kms, base)
>> +#define to_dpu_private_state(x) container_of(x, struct
> dpu_private_state, base)
>> +
>> +/**
>> + * dpu_get_private_state - get dpu private state from atomic state
>> + * @state: drm atomic state
>> + * Return: pointer to dpu private state object
>> + */
>> +struct dpu_private_state *dpu_get_private_state(struct 
>> drm_atomic_state
> *state);
>> 
>>  /**
>>   * dpu_is_custom_client - whether or not to enable non-standard
> customizations
>> --

-- 
Jeykumar S
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