diff mbox series

[v5,1/4] PCI: Introduce pcim_alloc_irq_vectors()

Message ID 20210226155056.1068534-2-zhengdejin5@gmail.com
State New
Headers show
Series Introduce pcim_alloc_irq_vectors() | expand

Commit Message

Dejin Zheng Feb. 26, 2021, 3:50 p.m. UTC
Introduce pcim_alloc_irq_vectors(), a device-managed version of
pci_alloc_irq_vectors(). Introducing this function can simplify
the error handling path in many drivers.

And use pci_free_irq_vectors() to replace some code in pcim_release(),
they are equivalent, and no functional change. It is more explicit
that pcim_alloc_irq_vectors() is a device-managed function.

Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
---
v4 -> v5:
	- Remove the check of enable device in pcim_alloc_irq_vectors()
	  and make it as a static line function.
v3 -> v4:
	- No change
v2 -> v3:
	- Add some commit comments for replace some codes in
	  pcim_release() by pci_free_irq_vectors().
v1 -> v2:
	- Use pci_free_irq_vectors() to replace some code in
	  pcim_release().
	- Modify some commit messages.

 drivers/pci/pci.c   |  5 +----
 include/linux/pci.h | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+), 4 deletions(-)

Comments

Andy Shevchenko Feb. 26, 2021, 4:23 p.m. UTC | #1
On Fri, Feb 26, 2021 at 11:50:53PM +0800, Dejin Zheng wrote:
> Introduce pcim_alloc_irq_vectors(), a device-managed version of
> pci_alloc_irq_vectors(). Introducing this function can simplify
> the error handling path in many drivers.
> 
> And use pci_free_irq_vectors() to replace some code in pcim_release(),
> they are equivalent, and no functional change. It is more explicit
> that pcim_alloc_irq_vectors() is a device-managed function.

Thanks!

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

> Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
> ---
> v4 -> v5:
> 	- Remove the check of enable device in pcim_alloc_irq_vectors()
> 	  and make it as a static line function.
> v3 -> v4:
> 	- No change
> v2 -> v3:
> 	- Add some commit comments for replace some codes in
> 	  pcim_release() by pci_free_irq_vectors().
> v1 -> v2:
> 	- Use pci_free_irq_vectors() to replace some code in
> 	  pcim_release().
> 	- Modify some commit messages.
> 
>  drivers/pci/pci.c   |  5 +----
>  include/linux/pci.h | 24 ++++++++++++++++++++++++
>  2 files changed, 25 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 16a17215f633..fecfdc0add2f 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -1969,10 +1969,7 @@ static void pcim_release(struct device *gendev, void *res)
>  	struct pci_devres *this = res;
>  	int i;
>  
> -	if (dev->msi_enabled)
> -		pci_disable_msi(dev);
> -	if (dev->msix_enabled)
> -		pci_disable_msix(dev);
> +	pci_free_irq_vectors(dev);
>  
>  	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
>  		if (this->region_mask & (1 << i))
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 86c799c97b77..5cafd7d65fd7 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1818,6 +1818,30 @@ pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
>  					      NULL);
>  }
>  
> +/**
> + * pcim_alloc_irq_vectors - a device-managed pci_alloc_irq_vectors()
> + * @dev:		PCI device to operate on
> + * @min_vecs:		minimum number of vectors required (must be >= 1)
> + * @max_vecs:		maximum (desired) number of vectors
> + * @flags:		flags or quirks for the allocation
> + *
> + * Return the number of vectors allocated, (which might be smaller than
> + * @max_vecs) if successful, or a negative error code on error. If less
> + * than @min_vecs interrupt vectors are available for @dev the function
> + * will fail with -ENOSPC.
> + *
> + * It depends on calling pcim_enable_device() to make IRQ resources
> + * manageable.
> + */
> +static inline int
> +pcim_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
> +			unsigned int max_vecs, unsigned int flags)
> +{
> +	if (!pci_is_managed(dev))
> +		return -EINVAL;
> +	return pci_alloc_irq_vectors(dev, min_vecs, max_vecs, flags);
> +}
> +
>  /* Include architecture-dependent settings and functions */
>  
>  #include <asm/pci.h>
> -- 
> 2.25.0
>
Dejin Zheng Feb. 28, 2021, 11:16 a.m. UTC | #2
On Fri, Feb 26, 2021 at 06:23:02PM +0200, Andy Shevchenko wrote:
> On Fri, Feb 26, 2021 at 11:50:53PM +0800, Dejin Zheng wrote:
> > Introduce pcim_alloc_irq_vectors(), a device-managed version of
> > pci_alloc_irq_vectors(). Introducing this function can simplify
> > the error handling path in many drivers.
> > 
> > And use pci_free_irq_vectors() to replace some code in pcim_release(),
> > they are equivalent, and no functional change. It is more explicit
> > that pcim_alloc_irq_vectors() is a device-managed function.
> 
> Thanks!
> 
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
>
Andy, Thanks!

> > Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> > Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
> > ---
> > v4 -> v5:
> > 	- Remove the check of enable device in pcim_alloc_irq_vectors()
> > 	  and make it as a static line function.
> > v3 -> v4:
> > 	- No change
> > v2 -> v3:
> > 	- Add some commit comments for replace some codes in
> > 	  pcim_release() by pci_free_irq_vectors().
> > v1 -> v2:
> > 	- Use pci_free_irq_vectors() to replace some code in
> > 	  pcim_release().
> > 	- Modify some commit messages.
> > 
> >  drivers/pci/pci.c   |  5 +----
> >  include/linux/pci.h | 24 ++++++++++++++++++++++++
> >  2 files changed, 25 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> > index 16a17215f633..fecfdc0add2f 100644
> > --- a/drivers/pci/pci.c
> > +++ b/drivers/pci/pci.c
> > @@ -1969,10 +1969,7 @@ static void pcim_release(struct device *gendev, void *res)
> >  	struct pci_devres *this = res;
> >  	int i;
> >  
> > -	if (dev->msi_enabled)
> > -		pci_disable_msi(dev);
> > -	if (dev->msix_enabled)
> > -		pci_disable_msix(dev);
> > +	pci_free_irq_vectors(dev);
> >  
> >  	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
> >  		if (this->region_mask & (1 << i))
> > diff --git a/include/linux/pci.h b/include/linux/pci.h
> > index 86c799c97b77..5cafd7d65fd7 100644
> > --- a/include/linux/pci.h
> > +++ b/include/linux/pci.h
> > @@ -1818,6 +1818,30 @@ pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
> >  					      NULL);
> >  }
> >  
> > +/**
> > + * pcim_alloc_irq_vectors - a device-managed pci_alloc_irq_vectors()
> > + * @dev:		PCI device to operate on
> > + * @min_vecs:		minimum number of vectors required (must be >= 1)
> > + * @max_vecs:		maximum (desired) number of vectors
> > + * @flags:		flags or quirks for the allocation
> > + *
> > + * Return the number of vectors allocated, (which might be smaller than
> > + * @max_vecs) if successful, or a negative error code on error. If less
> > + * than @min_vecs interrupt vectors are available for @dev the function
> > + * will fail with -ENOSPC.
> > + *
> > + * It depends on calling pcim_enable_device() to make IRQ resources
> > + * manageable.
> > + */
> > +static inline int
> > +pcim_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
> > +			unsigned int max_vecs, unsigned int flags)
> > +{
> > +	if (!pci_is_managed(dev))
> > +		return -EINVAL;
> > +	return pci_alloc_irq_vectors(dev, min_vecs, max_vecs, flags);
> > +}
> > +
> >  /* Include architecture-dependent settings and functions */
> >  
> >  #include <asm/pci.h>
> > -- 
> > 2.25.0
> > 
> 
> -- 
> With Best Regards,
> Andy Shevchenko
> 
>
Bjorn Helgaas March 23, 2021, 10:47 p.m. UTC | #3
[+cc Christoph, Thomas, Alexander, in case you're interested]
[+cc Jonathan, Kurt, Logan: vmd.c and switchtec.c use managed resources
and pci_alloc_irq_vectors()]

On Fri, Feb 26, 2021 at 11:50:53PM +0800, Dejin Zheng wrote:
> Introduce pcim_alloc_irq_vectors(), a device-managed version of
> pci_alloc_irq_vectors(). Introducing this function can simplify
> the error handling path in many drivers.
> 
> And use pci_free_irq_vectors() to replace some code in pcim_release(),
> they are equivalent, and no functional change. It is more explicit
> that pcim_alloc_irq_vectors() is a device-managed function.
> 
> Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>

Acked-by: Bjorn Helgaas <bhelgaas@google.com>

Let me know if you'd like me to take the series.

> ---
> v4 -> v5:
> 	- Remove the check of enable device in pcim_alloc_irq_vectors()
> 	  and make it as a static line function.
> v3 -> v4:
> 	- No change
> v2 -> v3:
> 	- Add some commit comments for replace some codes in
> 	  pcim_release() by pci_free_irq_vectors().
> v1 -> v2:
> 	- Use pci_free_irq_vectors() to replace some code in
> 	  pcim_release().
> 	- Modify some commit messages.
> 
>  drivers/pci/pci.c   |  5 +----
>  include/linux/pci.h | 24 ++++++++++++++++++++++++
>  2 files changed, 25 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 16a17215f633..fecfdc0add2f 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -1969,10 +1969,7 @@ static void pcim_release(struct device *gendev, void *res)
>  	struct pci_devres *this = res;
>  	int i;
>  
> -	if (dev->msi_enabled)
> -		pci_disable_msi(dev);
> -	if (dev->msix_enabled)
> -		pci_disable_msix(dev);
> +	pci_free_irq_vectors(dev);
>  
>  	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
>  		if (this->region_mask & (1 << i))
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 86c799c97b77..5cafd7d65fd7 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1818,6 +1818,30 @@ pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
>  					      NULL);
>  }
>  
> +/**
> + * pcim_alloc_irq_vectors - a device-managed pci_alloc_irq_vectors()
> + * @dev:		PCI device to operate on
> + * @min_vecs:		minimum number of vectors required (must be >= 1)
> + * @max_vecs:		maximum (desired) number of vectors
> + * @flags:		flags or quirks for the allocation
> + *
> + * Return the number of vectors allocated, (which might be smaller than
> + * @max_vecs) if successful, or a negative error code on error. If less
> + * than @min_vecs interrupt vectors are available for @dev the function
> + * will fail with -ENOSPC.
> + *
> + * It depends on calling pcim_enable_device() to make IRQ resources
> + * manageable.
> + */
> +static inline int
> +pcim_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
> +			unsigned int max_vecs, unsigned int flags)
> +{
> +	if (!pci_is_managed(dev))
> +		return -EINVAL;
> +	return pci_alloc_irq_vectors(dev, min_vecs, max_vecs, flags);
> +}
> +
>  /* Include architecture-dependent settings and functions */
>  
>  #include <asm/pci.h>
> -- 
> 2.25.0
>
diff mbox series

Patch

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 16a17215f633..fecfdc0add2f 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1969,10 +1969,7 @@  static void pcim_release(struct device *gendev, void *res)
 	struct pci_devres *this = res;
 	int i;
 
-	if (dev->msi_enabled)
-		pci_disable_msi(dev);
-	if (dev->msix_enabled)
-		pci_disable_msix(dev);
+	pci_free_irq_vectors(dev);
 
 	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
 		if (this->region_mask & (1 << i))
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 86c799c97b77..5cafd7d65fd7 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1818,6 +1818,30 @@  pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
 					      NULL);
 }
 
+/**
+ * pcim_alloc_irq_vectors - a device-managed pci_alloc_irq_vectors()
+ * @dev:		PCI device to operate on
+ * @min_vecs:		minimum number of vectors required (must be >= 1)
+ * @max_vecs:		maximum (desired) number of vectors
+ * @flags:		flags or quirks for the allocation
+ *
+ * Return the number of vectors allocated, (which might be smaller than
+ * @max_vecs) if successful, or a negative error code on error. If less
+ * than @min_vecs interrupt vectors are available for @dev the function
+ * will fail with -ENOSPC.
+ *
+ * It depends on calling pcim_enable_device() to make IRQ resources
+ * manageable.
+ */
+static inline int
+pcim_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
+			unsigned int max_vecs, unsigned int flags)
+{
+	if (!pci_is_managed(dev))
+		return -EINVAL;
+	return pci_alloc_irq_vectors(dev, min_vecs, max_vecs, flags);
+}
+
 /* Include architecture-dependent settings and functions */
 
 #include <asm/pci.h>