linux-kernel - Re: [Patch v2 3/4] PCI: Introduce helpers to manage pci_dev->irq and pci_dev->irq

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Date:	Fri, 5 Jun 2015 16:20:47 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: [Patch v2 3/4] PCI: Introduce helpers to manage pci_dev->irq and
 pci_dev->irq_managed

I'm on a campaign to squeeze more useful information into changelog
subjects.  "Add" means the same as "Introduce" but leaves more space for
other useful information.

On Tue, Jun 02, 2015 at 10:49:18AM +0800, Jiang Liu wrote:
> Introduce three helpers to manage pci_dev->irq and pci_dev->irq_managed,
> which helps to improve maintenance.
> 
> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
> ---
>  arch/x86/pci/intel_mid_pci.c |    4 ++--
>  arch/x86/pci/irq.c           |   10 ++++------
>  drivers/acpi/pci_irq.c       |   10 ++++------
>  include/linux/pci.h          |   17 +++++++++++++++++
>  4 files changed, 27 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/x86/pci/intel_mid_pci.c b/arch/x86/pci/intel_mid_pci.c
> index fb7a1f96d80c..22aaefb4f1ca 100644
> --- a/arch/x86/pci/intel_mid_pci.c
> +++ b/arch/x86/pci/intel_mid_pci.c
> @@ -211,7 +211,7 @@ static int intel_mid_pci_irq_enable(struct pci_dev *dev)
>  	struct irq_alloc_info info;
>  	int polarity;
>  
> -	if (dev->irq_managed && dev->irq > 0)
> +	if (pci_has_managed_irq(dev))
>  		return 0;
>  
>  	if (intel_mid_identify_cpu() == INTEL_MID_CPU_CHIP_TANGIER)
> @@ -234,7 +234,7 @@ static int intel_mid_pci_irq_enable(struct pci_dev *dev)
>  
>  static void intel_mid_pci_irq_disable(struct pci_dev *dev)
>  {
> -	if (dev->irq_managed && dev->irq > 0) {
> +	if (pci_has_managed_irq(dev)) {
>  		mp_unmap_irq(dev->irq);
>  		dev->irq_managed = 0;
>  		/*
> diff --git a/arch/x86/pci/irq.c b/arch/x86/pci/irq.c
> index 72108f0b66b1..32e70343e6fd 100644
> --- a/arch/x86/pci/irq.c
> +++ b/arch/x86/pci/irq.c
> @@ -1202,7 +1202,7 @@ static int pirq_enable_irq(struct pci_dev *dev)
>  			struct pci_dev *temp_dev;
>  			int irq;
>  
> -			if (dev->irq_managed && dev->irq > 0)
> +			if (pci_has_managed_irq(dev))
>  				return 0;
>  
>  			irq = IO_APIC_get_PCI_irq_vector(dev->bus->number,
> @@ -1230,8 +1230,7 @@ static int pirq_enable_irq(struct pci_dev *dev)
>  			}
>  			dev = temp_dev;
>  			if (irq >= 0) {
> -				dev->irq_managed = 1;
> -				dev->irq = irq;
> +				pci_set_managed_irq(dev, irq);
>  				dev_info(&dev->dev, "PCI->APIC IRQ transform: "
>  					 "INT %c -> IRQ %d\n", 'A' + pin - 1, irq);
>  				return 0;
> @@ -1259,9 +1258,8 @@ static int pirq_enable_irq(struct pci_dev *dev)
>  
>  static void pirq_disable_irq(struct pci_dev *dev)
>  {
> -	if (io_apic_assign_pci_irqs && dev->irq_managed && dev->irq) {
> +	if (io_apic_assign_pci_irqs && pci_has_managed_irq(dev)) {
>  		mp_unmap_irq(dev->irq);
> -		dev->irq = 0;
> -		dev->irq_managed = 0;
> +		pci_reset_managed_irq(dev);
>  	}
>  }
> diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
> index e7f718d6918a..9d6343d02f7e 100644
> --- a/drivers/acpi/pci_irq.c
> +++ b/drivers/acpi/pci_irq.c
> @@ -413,7 +413,7 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
>  		return 0;
>  	}
>  
> -	if (dev->irq_managed && dev->irq > 0)
> +	if (pci_has_managed_irq(dev))
>  		return 0;
>  
>  	entry = acpi_pci_irq_lookup(dev, pin);
> @@ -458,8 +458,7 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
>  		kfree(entry);
>  		return rc;
>  	}
> -	dev->irq = rc;
> -	dev->irq_managed = 1;
> +	pci_set_managed_irq(dev, rc);
>  
>  	if (link)
>  		snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
> @@ -482,7 +481,7 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
>  	u8 pin;
>  
>  	pin = dev->pin;
> -	if (!pin || !dev->irq_managed || dev->irq <= 0)
> +	if (!pin || !pci_has_managed_irq(dev))
>  		return;
>  
>  	entry = acpi_pci_irq_lookup(dev, pin);
> @@ -504,7 +503,6 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
>  	dev_dbg(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
>  	if (gsi >= 0) {
>  		acpi_unregister_gsi(gsi);
> -		dev->irq_managed = 0;
> -		dev->irq = 0;
> +		pci_reset_managed_irq(dev);
>  	}
>  }
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index f50d16a04abc..4bc640eef76f 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -958,6 +958,23 @@ static inline int pci_is_managed(struct pci_dev *pdev)
>  	return pdev->is_managed;
>  }
>  
> +static inline void pci_set_managed_irq(struct pci_dev *pdev, unsigned int irq)
> +{
> +	pdev->irq = irq;
> +	pdev->irq_managed = 1;
> +}
> +
> +static inline void pci_reset_managed_irq(struct pci_dev *pdev)
> +{
> +	pdev->irq = 0;
> +	pdev->irq_managed = 0;
> +}
> +
> +static inline bool pci_has_managed_irq(struct pci_dev *pdev)
> +{
> +	return pdev->irq_managed && pdev->irq > 0;
> +}
> +
>  void pci_disable_device(struct pci_dev *dev);
>  
>  extern unsigned int pcibios_max_latency;
> -- 
> 1.7.10.4
> 
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