Re: [PATCH v2 3/4] drm/msm/dpu: add helper to get IRQ-related data

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On 2023-07-27 18:04:54, Dmitry Baryshkov wrote:
> In preparation to reworking the IRQ indices, move irq_tbl access to
> separate helper.

I am not seeing the advantage of the helper, but making every function
look up dpu_kms->hw_intr->irq_tbl[irq_idx] only once and storing that in
a local dpu_hw_intr_entry pointer is much tidier.

Maybe I expected it to do extra mutations to irq_idx in 4/4?

> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>

Reviewed-by: Marijn Suijten <marijn.suijten@xxxxxxxxxxxxxx>

> ---
>  .../gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c | 48 +++++++++++++------
>  .../gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h | 12 +++--
>  2 files changed, 41 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
> index eaae7f11f57f..ede7161ae904 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
> @@ -199,6 +199,12 @@ static const struct dpu_intr_reg dpu_intr_set_7xxx[] = {
>  
>  #define DPU_IRQ_MASK(irq_idx)	(BIT(DPU_IRQ_OFFSET(irq_idx)))
>  
> +static inline struct dpu_hw_intr_entry *dpu_core_irq_get_entry(struct dpu_kms *dpu_kms,
> +							       int irq_idx)
> +{
> +	return &dpu_kms->hw_intr->irq_tbl[irq_idx];
> +}
> +
>  /**
>   * dpu_core_irq_callback_handler - dispatch core interrupts
>   * @dpu_kms:		Pointer to DPU's KMS structure
> @@ -206,17 +212,19 @@ static const struct dpu_intr_reg dpu_intr_set_7xxx[] = {
>   */
>  static void dpu_core_irq_callback_handler(struct dpu_kms *dpu_kms, int irq_idx)
>  {
> +	struct dpu_hw_intr_entry *irq_entry = dpu_core_irq_get_entry(dpu_kms, irq_idx);
> +
>  	VERB("irq_idx=%d\n", irq_idx);
>  
> -	if (!dpu_kms->hw_intr->irq_tbl[irq_idx].cb)
> +	if (!irq_entry->cb)
>  		DRM_ERROR("no registered cb, idx:%d\n", irq_idx);
>  
> -	atomic_inc(&dpu_kms->hw_intr->irq_tbl[irq_idx].count);
> +	atomic_inc(&irq_entry->count);
>  
>  	/*
>  	 * Perform registered function callback
>  	 */
> -	dpu_kms->hw_intr->irq_tbl[irq_idx].cb(dpu_kms->hw_intr->irq_tbl[irq_idx].arg);
> +	irq_entry->cb(irq_entry->arg);
>  }
>  
>  irqreturn_t dpu_core_irq(struct msm_kms *kms)
> @@ -509,6 +517,7 @@ int dpu_core_irq_register_callback(struct dpu_kms *dpu_kms, int irq_idx,
>  		void (*irq_cb)(void *arg),
>  		void *irq_arg)
>  {
> +	struct dpu_hw_intr_entry *irq_entry;
>  	unsigned long irq_flags;
>  	int ret;
>  
> @@ -526,15 +535,16 @@ int dpu_core_irq_register_callback(struct dpu_kms *dpu_kms, int irq_idx,
>  
>  	spin_lock_irqsave(&dpu_kms->hw_intr->irq_lock, irq_flags);
>  
> -	if (unlikely(WARN_ON(dpu_kms->hw_intr->irq_tbl[irq_idx].cb))) {
> +	irq_entry = dpu_core_irq_get_entry(dpu_kms, irq_idx);
> +	if (unlikely(WARN_ON(irq_entry->cb))) {
>  		spin_unlock_irqrestore(&dpu_kms->hw_intr->irq_lock, irq_flags);
>  
>  		return -EBUSY;
>  	}
>  
>  	trace_dpu_core_irq_register_callback(irq_idx, irq_cb);
> -	dpu_kms->hw_intr->irq_tbl[irq_idx].arg = irq_arg;
> -	dpu_kms->hw_intr->irq_tbl[irq_idx].cb = irq_cb;
> +	irq_entry->arg = irq_arg;
> +	irq_entry->cb = irq_cb;
>  
>  	ret = dpu_hw_intr_enable_irq_locked(
>  				dpu_kms->hw_intr,
> @@ -551,6 +561,7 @@ int dpu_core_irq_register_callback(struct dpu_kms *dpu_kms, int irq_idx,
>  
>  int dpu_core_irq_unregister_callback(struct dpu_kms *dpu_kms, int irq_idx)
>  {
> +	struct dpu_hw_intr_entry *irq_entry;
>  	unsigned long irq_flags;
>  	int ret;
>  
> @@ -569,8 +580,9 @@ int dpu_core_irq_unregister_callback(struct dpu_kms *dpu_kms, int irq_idx)
>  		DPU_ERROR("Fail to disable IRQ for irq_idx:%d: %d\n",
>  					irq_idx, ret);
>  
> -	dpu_kms->hw_intr->irq_tbl[irq_idx].cb = NULL;
> -	dpu_kms->hw_intr->irq_tbl[irq_idx].arg = NULL;
> +	irq_entry = dpu_core_irq_get_entry(dpu_kms, irq_idx);
> +	irq_entry->cb = NULL;
> +	irq_entry->arg = NULL;
>  
>  	spin_unlock_irqrestore(&dpu_kms->hw_intr->irq_lock, irq_flags);
>  
> @@ -583,14 +595,16 @@ int dpu_core_irq_unregister_callback(struct dpu_kms *dpu_kms, int irq_idx)
>  static int dpu_debugfs_core_irq_show(struct seq_file *s, void *v)
>  {
>  	struct dpu_kms *dpu_kms = s->private;
> +	struct dpu_hw_intr_entry *irq_entry;
>  	unsigned long irq_flags;
>  	int i, irq_count;
>  	void *cb;
>  
>  	for (i = 0; i < dpu_kms->hw_intr->total_irqs; i++) {
>  		spin_lock_irqsave(&dpu_kms->hw_intr->irq_lock, irq_flags);
> -		irq_count = atomic_read(&dpu_kms->hw_intr->irq_tbl[i].count);
> -		cb = dpu_kms->hw_intr->irq_tbl[i].cb;
> +		irq_entry = dpu_core_irq_get_entry(dpu_kms, i);
> +		irq_count = atomic_read(&irq_entry->count);
> +		cb = irq_entry->cb;
>  		spin_unlock_irqrestore(&dpu_kms->hw_intr->irq_lock, irq_flags);
>  
>  		if (irq_count || cb)
> @@ -613,6 +627,7 @@ void dpu_debugfs_core_irq_init(struct dpu_kms *dpu_kms,
>  void dpu_core_irq_preinstall(struct msm_kms *kms)
>  {
>  	struct dpu_kms *dpu_kms = to_dpu_kms(kms);
> +	struct dpu_hw_intr_entry *irq_entry;
>  	int i;
>  
>  	pm_runtime_get_sync(&dpu_kms->pdev->dev);
> @@ -620,22 +635,27 @@ void dpu_core_irq_preinstall(struct msm_kms *kms)
>  	dpu_disable_all_irqs(dpu_kms);
>  	pm_runtime_put_sync(&dpu_kms->pdev->dev);
>  
> -	for (i = 0; i < dpu_kms->hw_intr->total_irqs; i++)
> -		atomic_set(&dpu_kms->hw_intr->irq_tbl[i].count, 0);
> +	for (i = 0; i < dpu_kms->hw_intr->total_irqs; i++) {
> +		irq_entry = dpu_core_irq_get_entry(dpu_kms, i);
> +		atomic_set(&irq_entry->count, 0);
> +	}
>  }
>  
>  void dpu_core_irq_uninstall(struct msm_kms *kms)
>  {
>  	struct dpu_kms *dpu_kms = to_dpu_kms(kms);
> +	struct dpu_hw_intr_entry *irq_entry;
>  	int i;
>  
>  	if (!dpu_kms->hw_intr)
>  		return;
>  
>  	pm_runtime_get_sync(&dpu_kms->pdev->dev);
> -	for (i = 0; i < dpu_kms->hw_intr->total_irqs; i++)
> -		if (dpu_kms->hw_intr->irq_tbl[i].cb)
> +	for (i = 0; i < dpu_kms->hw_intr->total_irqs; i++) {
> +		irq_entry = dpu_core_irq_get_entry(dpu_kms, i);
> +		if (irq_entry->cb)
>  			DPU_ERROR("irq_idx=%d still enabled/registered\n", i);
> +	}
>  
>  	dpu_clear_irqs(dpu_kms);
>  	dpu_disable_all_irqs(dpu_kms);
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
> index 3a988a4e4f33..59bde8ab50c8 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
> @@ -40,6 +40,12 @@ enum dpu_hw_intr_reg {
>  #define DPU_IRQ_REG(irq_idx)		((irq_idx) / 32)
>  #define DPU_IRQ_OFFSET(irq_idx)		((irq_idx) % 32)
>  
> +struct dpu_hw_intr_entry {
> +	void (*cb)(void *arg);
> +	void *arg;
> +	atomic_t count;
> +};
> +
>  /**
>   * struct dpu_hw_intr: hw interrupts handling data structure
>   * @hw:               virtual address mapping
> @@ -59,11 +65,7 @@ struct dpu_hw_intr {
>  	unsigned long irq_mask;
>  	const struct dpu_intr_reg *intr_set;
>  
> -	struct {
> -		void (*cb)(void *arg);
> -		void *arg;
> -		atomic_t count;
> -	} irq_tbl[];
> +	struct dpu_hw_intr_entry irq_tbl[];
>  };
>  
>  /**
> -- 
> 2.39.2
> 



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