[7/7] vfio_pci: Use PCI_STD_NUM_BARS in loops instead of PCI_STD_RESOURCE_END
diff mbox series

Message ID 20190811150802.2418-8-efremov@linux.com
State Superseded
Delegated to: Bjorn Helgaas
Headers show
Series
  • Add definition for the number of standard PCI BARs
Related show

Commit Message

Denis Efremov Aug. 11, 2019, 3:08 p.m. UTC
This patch refactors the loop condition scheme from
'i <= PCI_STD_RESOURCE_END' to 'i < PCI_STD_NUM_BARS'.

Signed-off-by: Denis Efremov <efremov@linux.com>
---
 drivers/vfio/pci/vfio_pci.c         | 4 ++--
 drivers/vfio/pci/vfio_pci_config.c  | 2 +-
 drivers/vfio/pci/vfio_pci_private.h | 4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)

Comments

Bjorn Helgaas Aug. 12, 2019, 8:02 p.m. UTC | #1
On Sun, Aug 11, 2019 at 06:08:04PM +0300, Denis Efremov wrote:
> This patch refactors the loop condition scheme from
> 'i <= PCI_STD_RESOURCE_END' to 'i < PCI_STD_NUM_BARS'.
> 
> Signed-off-by: Denis Efremov <efremov@linux.com>
> ---
>  drivers/vfio/pci/vfio_pci.c         | 4 ++--
>  drivers/vfio/pci/vfio_pci_config.c  | 2 +-
>  drivers/vfio/pci/vfio_pci_private.h | 4 ++--
>  3 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
> index 703948c9fbe1..13f5430e3f3c 100644
> --- a/drivers/vfio/pci/vfio_pci.c
> +++ b/drivers/vfio/pci/vfio_pci.c
> @@ -115,7 +115,7 @@ static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev)
>  
>  	INIT_LIST_HEAD(&vdev->dummy_resources_list);
>  
> -	for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
> +	for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
>  		res = vdev->pdev->resource + bar;

PCI_STD_RESOURCES is indeed 0, but since the original went to the
trouble of avoiding that assumption, I would probably do this:

        for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
                res = vdev->pdev->resource + bar + PCI_STD_RESOURCES;

or maybe even this:

                res = &vdev->pdev->resource[bar + PCI_STD_RESOURCES];

which is more common outside vfio.  But I wouldn't change to using the
&dev->resource[] form if other vfio code that you're *not* changing
uses the dev->resource + bar form.

>  		if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP))
> @@ -399,7 +399,7 @@ static void vfio_pci_disable(struct vfio_pci_device *vdev)
>  
>  	vfio_config_free(vdev);
>  
> -	for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
> +	for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
>  		if (!vdev->barmap[bar])
>  			continue;
>  		pci_iounmap(pdev, vdev->barmap[bar]);
> diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
> index f0891bd8444c..6035a2961160 100644
> --- a/drivers/vfio/pci/vfio_pci_config.c
> +++ b/drivers/vfio/pci/vfio_pci_config.c
> @@ -455,7 +455,7 @@ static void vfio_bar_fixup(struct vfio_pci_device *vdev)
>  
>  	bar = (__le32 *)&vdev->vconfig[PCI_BASE_ADDRESS_0];
>  
> -	for (i = PCI_STD_RESOURCES; i <= PCI_STD_RESOURCE_END; i++, bar++) {
> +	for (i = 0; i < PCI_STD_NUM_BARS; i++, bar++) {
>  		if (!pci_resource_start(pdev, i)) {
>  			*bar = 0; /* Unmapped by host = unimplemented to user */
>  			continue;
> diff --git a/drivers/vfio/pci/vfio_pci_private.h b/drivers/vfio/pci/vfio_pci_private.h
> index ee6ee91718a4..8a2c7607d513 100644
> --- a/drivers/vfio/pci/vfio_pci_private.h
> +++ b/drivers/vfio/pci/vfio_pci_private.h
> @@ -86,8 +86,8 @@ struct vfio_pci_reflck {
>  
>  struct vfio_pci_device {
>  	struct pci_dev		*pdev;
> -	void __iomem		*barmap[PCI_STD_RESOURCE_END + 1];
> -	bool			bar_mmap_supported[PCI_STD_RESOURCE_END + 1];
> +	void __iomem		*barmap[PCI_STD_NUM_BARS];
> +	bool			bar_mmap_supported[PCI_STD_NUM_BARS];
>  	u8			*pci_config_map;
>  	u8			*vconfig;
>  	struct perm_bits	*msi_perm;
> -- 
> 2.21.0
>
Alex Williamson Aug. 12, 2019, 8:52 p.m. UTC | #2
On Mon, 12 Aug 2019 15:02:34 -0500
Bjorn Helgaas <helgaas@kernel.org> wrote:

> On Sun, Aug 11, 2019 at 06:08:04PM +0300, Denis Efremov wrote:
> > This patch refactors the loop condition scheme from
> > 'i <= PCI_STD_RESOURCE_END' to 'i < PCI_STD_NUM_BARS'.
> > 
> > Signed-off-by: Denis Efremov <efremov@linux.com>
> > ---
> >  drivers/vfio/pci/vfio_pci.c         | 4 ++--
> >  drivers/vfio/pci/vfio_pci_config.c  | 2 +-
> >  drivers/vfio/pci/vfio_pci_private.h | 4 ++--
> >  3 files changed, 5 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
> > index 703948c9fbe1..13f5430e3f3c 100644
> > --- a/drivers/vfio/pci/vfio_pci.c
> > +++ b/drivers/vfio/pci/vfio_pci.c
> > @@ -115,7 +115,7 @@ static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev)
> >  
> >  	INIT_LIST_HEAD(&vdev->dummy_resources_list);
> >  
> > -	for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
> > +	for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
> >  		res = vdev->pdev->resource + bar;  
> 
> PCI_STD_RESOURCES is indeed 0, but since the original went to the
> trouble of avoiding that assumption, I would probably do this:
> 
>         for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
>                 res = vdev->pdev->resource + bar + PCI_STD_RESOURCES;
> 
> or maybe even this:
> 
>                 res = &vdev->pdev->resource[bar + PCI_STD_RESOURCES];
> 
> which is more common outside vfio.  But I wouldn't change to using the
> &dev->resource[] form if other vfio code that you're *not* changing
> uses the dev->resource + bar form.

I don't think we have any other instances like that, so the latter form
is fine with me if it's more broadly used.  I do spot one use of [bar]
in drivers/vfio/pci/vfio_pci_rdwr.c that could also take on this form
to void the same assumption though.  Thanks,

Alex

> >  		if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP))
> > @@ -399,7 +399,7 @@ static void vfio_pci_disable(struct vfio_pci_device *vdev)
> >  
> >  	vfio_config_free(vdev);
> >  
> > -	for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
> > +	for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
> >  		if (!vdev->barmap[bar])
> >  			continue;
> >  		pci_iounmap(pdev, vdev->barmap[bar]);
> > diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
> > index f0891bd8444c..6035a2961160 100644
> > --- a/drivers/vfio/pci/vfio_pci_config.c
> > +++ b/drivers/vfio/pci/vfio_pci_config.c
> > @@ -455,7 +455,7 @@ static void vfio_bar_fixup(struct vfio_pci_device *vdev)
> >  
> >  	bar = (__le32 *)&vdev->vconfig[PCI_BASE_ADDRESS_0];
> >  
> > -	for (i = PCI_STD_RESOURCES; i <= PCI_STD_RESOURCE_END; i++, bar++) {
> > +	for (i = 0; i < PCI_STD_NUM_BARS; i++, bar++) {
> >  		if (!pci_resource_start(pdev, i)) {
> >  			*bar = 0; /* Unmapped by host = unimplemented to user */
> >  			continue;
> > diff --git a/drivers/vfio/pci/vfio_pci_private.h b/drivers/vfio/pci/vfio_pci_private.h
> > index ee6ee91718a4..8a2c7607d513 100644
> > --- a/drivers/vfio/pci/vfio_pci_private.h
> > +++ b/drivers/vfio/pci/vfio_pci_private.h
> > @@ -86,8 +86,8 @@ struct vfio_pci_reflck {
> >  
> >  struct vfio_pci_device {
> >  	struct pci_dev		*pdev;
> > -	void __iomem		*barmap[PCI_STD_RESOURCE_END + 1];
> > -	bool			bar_mmap_supported[PCI_STD_RESOURCE_END + 1];
> > +	void __iomem		*barmap[PCI_STD_NUM_BARS];
> > +	bool			bar_mmap_supported[PCI_STD_NUM_BARS];
> >  	u8			*pci_config_map;
> >  	u8			*vconfig;
> >  	struct perm_bits	*msi_perm;
> > -- 
> > 2.21.0
> >

Patch
diff mbox series

diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 703948c9fbe1..13f5430e3f3c 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -115,7 +115,7 @@  static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev)
 
 	INIT_LIST_HEAD(&vdev->dummy_resources_list);
 
-	for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
+	for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
 		res = vdev->pdev->resource + bar;
 
 		if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP))
@@ -399,7 +399,7 @@  static void vfio_pci_disable(struct vfio_pci_device *vdev)
 
 	vfio_config_free(vdev);
 
-	for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
+	for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
 		if (!vdev->barmap[bar])
 			continue;
 		pci_iounmap(pdev, vdev->barmap[bar]);
diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
index f0891bd8444c..6035a2961160 100644
--- a/drivers/vfio/pci/vfio_pci_config.c
+++ b/drivers/vfio/pci/vfio_pci_config.c
@@ -455,7 +455,7 @@  static void vfio_bar_fixup(struct vfio_pci_device *vdev)
 
 	bar = (__le32 *)&vdev->vconfig[PCI_BASE_ADDRESS_0];
 
-	for (i = PCI_STD_RESOURCES; i <= PCI_STD_RESOURCE_END; i++, bar++) {
+	for (i = 0; i < PCI_STD_NUM_BARS; i++, bar++) {
 		if (!pci_resource_start(pdev, i)) {
 			*bar = 0; /* Unmapped by host = unimplemented to user */
 			continue;
diff --git a/drivers/vfio/pci/vfio_pci_private.h b/drivers/vfio/pci/vfio_pci_private.h
index ee6ee91718a4..8a2c7607d513 100644
--- a/drivers/vfio/pci/vfio_pci_private.h
+++ b/drivers/vfio/pci/vfio_pci_private.h
@@ -86,8 +86,8 @@  struct vfio_pci_reflck {
 
 struct vfio_pci_device {
 	struct pci_dev		*pdev;
-	void __iomem		*barmap[PCI_STD_RESOURCE_END + 1];
-	bool			bar_mmap_supported[PCI_STD_RESOURCE_END + 1];
+	void __iomem		*barmap[PCI_STD_NUM_BARS];
+	bool			bar_mmap_supported[PCI_STD_NUM_BARS];
 	u8			*pci_config_map;
 	u8			*vconfig;
 	struct perm_bits	*msi_perm;