[v3,17/26] vfio_pci: Loop using PCI_STD_NUM_BARS
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Message ID 20190916204158.6889-18-efremov@linux.com
State New
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Series
  • Untitled series #174757
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Commit Message

Denis Efremov Sept. 16, 2019, 8:41 p.m. UTC
Refactor loops to use idiomatic C style and avoid the fencepost error
of using "i < PCI_STD_RESOURCE_END" when "i <= PCI_STD_RESOURCE_END"
is required, e.g., commit 2f686f1d9bee ("PCI: Correct PCI_STD_RESOURCE_END
usage").

To iterate through all possible BARs, loop conditions changed to the
*number* of BARs "i < PCI_STD_NUM_BARS", instead of the index of the last
valid BAR "i <= PCI_STD_RESOURCE_END".

Cc: Cornelia Huck <cohuck@redhat.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Denis Efremov <efremov@linux.com>
---
 drivers/vfio/pci/vfio_pci.c         | 11 ++++++----
 drivers/vfio/pci/vfio_pci_config.c  | 32 +++++++++++++++--------------
 drivers/vfio/pci/vfio_pci_private.h |  4 ++--
 3 files changed, 26 insertions(+), 21 deletions(-)

Comments

Andrew Murray Sept. 18, 2019, 9:17 a.m. UTC | #1
On Mon, Sep 16, 2019 at 11:41:49PM +0300, Denis Efremov wrote:
> Refactor loops to use idiomatic C style and avoid the fencepost error
> of using "i < PCI_STD_RESOURCE_END" when "i <= PCI_STD_RESOURCE_END"
> is required, e.g., commit 2f686f1d9bee ("PCI: Correct PCI_STD_RESOURCE_END
> usage").
> 
> To iterate through all possible BARs, loop conditions changed to the
> *number* of BARs "i < PCI_STD_NUM_BARS", instead of the index of the last
> valid BAR "i <= PCI_STD_RESOURCE_END".
> 
> Cc: Cornelia Huck <cohuck@redhat.com>
> Cc: Alex Williamson <alex.williamson@redhat.com>
> Signed-off-by: Denis Efremov <efremov@linux.com>
> ---
>  drivers/vfio/pci/vfio_pci.c         | 11 ++++++----
>  drivers/vfio/pci/vfio_pci_config.c  | 32 +++++++++++++++--------------
>  drivers/vfio/pci/vfio_pci_private.h |  4 ++--
>  3 files changed, 26 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
> index 703948c9fbe1..cb7d220d3246 100644
> --- a/drivers/vfio/pci/vfio_pci.c
> +++ b/drivers/vfio/pci/vfio_pci.c
> @@ -110,13 +110,15 @@ static inline bool vfio_pci_is_vga(struct pci_dev *pdev)
>  static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev)
>  {
>  	struct resource *res;
> -	int bar;
> +	int i;
>  	struct vfio_pci_dummy_resource *dummy_res;
>  
>  	INIT_LIST_HEAD(&vdev->dummy_resources_list);
>  
> -	for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
> -		res = vdev->pdev->resource + bar;
> +	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
> +		int bar = i + PCI_STD_RESOURCES;
> +
> +		res = &vdev->pdev->resource[bar];

Why can't we just drop PCI_STD_RESOURCES and replace it was 0. I understand
the abstraction here, but we don't do it elsewhere across the kernel. Is this
necessary?

Thanks,

Andrew Murray

>  
>  		if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP))
>  			goto no_mmap;
> @@ -399,7 +401,8 @@ 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 (i = 0; i < PCI_STD_NUM_BARS; i++) {
> +		bar = i + PCI_STD_RESOURCES;
>  		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..90c0b80f8acf 100644
> --- a/drivers/vfio/pci/vfio_pci_config.c
> +++ b/drivers/vfio/pci/vfio_pci_config.c
> @@ -450,30 +450,32 @@ static void vfio_bar_fixup(struct vfio_pci_device *vdev)
>  {
>  	struct pci_dev *pdev = vdev->pdev;
>  	int i;
> -	__le32 *bar;
> +	__le32 *vbar;
>  	u64 mask;
>  
> -	bar = (__le32 *)&vdev->vconfig[PCI_BASE_ADDRESS_0];
> +	vbar = (__le32 *)&vdev->vconfig[PCI_BASE_ADDRESS_0];
>  
> -	for (i = PCI_STD_RESOURCES; i <= PCI_STD_RESOURCE_END; i++, bar++) {
> -		if (!pci_resource_start(pdev, i)) {
> -			*bar = 0; /* Unmapped by host = unimplemented to user */
> +	for (i = 0; i < PCI_STD_NUM_BARS; i++, vbar++) {
> +		int bar = i + PCI_STD_RESOURCES;
> +
> +		if (!pci_resource_start(pdev, bar)) {
> +			*vbar = 0; /* Unmapped by host = unimplemented to user */
>  			continue;
>  		}
>  
> -		mask = ~(pci_resource_len(pdev, i) - 1);
> +		mask = ~(pci_resource_len(pdev, bar) - 1);
>  
> -		*bar &= cpu_to_le32((u32)mask);
> -		*bar |= vfio_generate_bar_flags(pdev, i);
> +		*vbar &= cpu_to_le32((u32)mask);
> +		*vbar |= vfio_generate_bar_flags(pdev, bar);
>  
> -		if (*bar & cpu_to_le32(PCI_BASE_ADDRESS_MEM_TYPE_64)) {
> -			bar++;
> -			*bar &= cpu_to_le32((u32)(mask >> 32));
> +		if (*vbar & cpu_to_le32(PCI_BASE_ADDRESS_MEM_TYPE_64)) {
> +			vbar++;
> +			*vbar &= cpu_to_le32((u32)(mask >> 32));
>  			i++;
>  		}
>  	}
>  
> -	bar = (__le32 *)&vdev->vconfig[PCI_ROM_ADDRESS];
> +	vbar = (__le32 *)&vdev->vconfig[PCI_ROM_ADDRESS];
>  
>  	/*
>  	 * NB. REGION_INFO will have reported zero size if we weren't able
> @@ -483,14 +485,14 @@ static void vfio_bar_fixup(struct vfio_pci_device *vdev)
>  	if (pci_resource_start(pdev, PCI_ROM_RESOURCE)) {
>  		mask = ~(pci_resource_len(pdev, PCI_ROM_RESOURCE) - 1);
>  		mask |= PCI_ROM_ADDRESS_ENABLE;
> -		*bar &= cpu_to_le32((u32)mask);
> +		*vbar &= cpu_to_le32((u32)mask);
>  	} else if (pdev->resource[PCI_ROM_RESOURCE].flags &
>  					IORESOURCE_ROM_SHADOW) {
>  		mask = ~(0x20000 - 1);
>  		mask |= PCI_ROM_ADDRESS_ENABLE;
> -		*bar &= cpu_to_le32((u32)mask);
> +		*vbar &= cpu_to_le32((u32)mask);
>  	} else
> -		*bar = 0;
> +		*vbar = 0;
>  
>  	vdev->bardirty = false;
>  }
> 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
>
Denis Efremov Sept. 18, 2019, 2:31 p.m. UTC | #2
On 9/18/19 12:17 PM, Andrew Murray wrote:
> On Mon, Sep 16, 2019 at 11:41:49PM +0300, Denis Efremov wrote:
>> Refactor loops to use idiomatic C style and avoid the fencepost error
>> of using "i < PCI_STD_RESOURCE_END" when "i <= PCI_STD_RESOURCE_END"
>> is required, e.g., commit 2f686f1d9bee ("PCI: Correct PCI_STD_RESOURCE_END
>> usage").
>>
>> To iterate through all possible BARs, loop conditions changed to the
>> *number* of BARs "i < PCI_STD_NUM_BARS", instead of the index of the last
>> valid BAR "i <= PCI_STD_RESOURCE_END".
>>
>> Cc: Cornelia Huck <cohuck@redhat.com>
>> Cc: Alex Williamson <alex.williamson@redhat.com>
>> Signed-off-by: Denis Efremov <efremov@linux.com>
>> ---
>>  drivers/vfio/pci/vfio_pci.c         | 11 ++++++----
>>  drivers/vfio/pci/vfio_pci_config.c  | 32 +++++++++++++++--------------
>>  drivers/vfio/pci/vfio_pci_private.h |  4 ++--
>>  3 files changed, 26 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
>> index 703948c9fbe1..cb7d220d3246 100644
>> --- a/drivers/vfio/pci/vfio_pci.c
>> +++ b/drivers/vfio/pci/vfio_pci.c
>> @@ -110,13 +110,15 @@ static inline bool vfio_pci_is_vga(struct pci_dev *pdev)
>>  static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev)
>>  {
>>  	struct resource *res;
>> -	int bar;
>> +	int i;
>>  	struct vfio_pci_dummy_resource *dummy_res;
>>  
>>  	INIT_LIST_HEAD(&vdev->dummy_resources_list);
>>  
>> -	for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
>> -		res = vdev->pdev->resource + bar;
>> +	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
>> +		int bar = i + PCI_STD_RESOURCES;
>> +
>> +		res = &vdev->pdev->resource[bar];
> 
> Why can't we just drop PCI_STD_RESOURCES and replace it was 0. I understand
> the abstraction here, but we don't do it elsewhere across the kernel. Is this
> necessary?

There was a discussion about this particular case:
https://lkml.org/lkml/2019/8/12/999

It was decided to save the original style for vfio drivers.

> 
> Thanks,
> 
> Andrew Murray
> 
>>  
>>  		if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP))
>>  			goto no_mmap;
>> @@ -399,7 +401,8 @@ 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 (i = 0; i < PCI_STD_NUM_BARS; i++) {
>> +		bar = i + PCI_STD_RESOURCES;
>>  		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..90c0b80f8acf 100644
>> --- a/drivers/vfio/pci/vfio_pci_config.c
>> +++ b/drivers/vfio/pci/vfio_pci_config.c
>> @@ -450,30 +450,32 @@ static void vfio_bar_fixup(struct vfio_pci_device *vdev)
>>  {
>>  	struct pci_dev *pdev = vdev->pdev;
>>  	int i;
>> -	__le32 *bar;
>> +	__le32 *vbar;
>>  	u64 mask;
>>  
>> -	bar = (__le32 *)&vdev->vconfig[PCI_BASE_ADDRESS_0];
>> +	vbar = (__le32 *)&vdev->vconfig[PCI_BASE_ADDRESS_0];
>>  
>> -	for (i = PCI_STD_RESOURCES; i <= PCI_STD_RESOURCE_END; i++, bar++) {
>> -		if (!pci_resource_start(pdev, i)) {
>> -			*bar = 0; /* Unmapped by host = unimplemented to user */
>> +	for (i = 0; i < PCI_STD_NUM_BARS; i++, vbar++) {
>> +		int bar = i + PCI_STD_RESOURCES;
>> +
>> +		if (!pci_resource_start(pdev, bar)) {
>> +			*vbar = 0; /* Unmapped by host = unimplemented to user */
>>  			continue;
>>  		}
>>  
>> -		mask = ~(pci_resource_len(pdev, i) - 1);
>> +		mask = ~(pci_resource_len(pdev, bar) - 1);
>>  
>> -		*bar &= cpu_to_le32((u32)mask);
>> -		*bar |= vfio_generate_bar_flags(pdev, i);
>> +		*vbar &= cpu_to_le32((u32)mask);
>> +		*vbar |= vfio_generate_bar_flags(pdev, bar);
>>  
>> -		if (*bar & cpu_to_le32(PCI_BASE_ADDRESS_MEM_TYPE_64)) {
>> -			bar++;
>> -			*bar &= cpu_to_le32((u32)(mask >> 32));
>> +		if (*vbar & cpu_to_le32(PCI_BASE_ADDRESS_MEM_TYPE_64)) {
>> +			vbar++;
>> +			*vbar &= cpu_to_le32((u32)(mask >> 32));
>>  			i++;
>>  		}
>>  	}
>>  
>> -	bar = (__le32 *)&vdev->vconfig[PCI_ROM_ADDRESS];
>> +	vbar = (__le32 *)&vdev->vconfig[PCI_ROM_ADDRESS];
>>  
>>  	/*
>>  	 * NB. REGION_INFO will have reported zero size if we weren't able
>> @@ -483,14 +485,14 @@ static void vfio_bar_fixup(struct vfio_pci_device *vdev)
>>  	if (pci_resource_start(pdev, PCI_ROM_RESOURCE)) {
>>  		mask = ~(pci_resource_len(pdev, PCI_ROM_RESOURCE) - 1);
>>  		mask |= PCI_ROM_ADDRESS_ENABLE;
>> -		*bar &= cpu_to_le32((u32)mask);
>> +		*vbar &= cpu_to_le32((u32)mask);
>>  	} else if (pdev->resource[PCI_ROM_RESOURCE].flags &
>>  					IORESOURCE_ROM_SHADOW) {
>>  		mask = ~(0x20000 - 1);
>>  		mask |= PCI_ROM_ADDRESS_ENABLE;
>> -		*bar &= cpu_to_le32((u32)mask);
>> +		*vbar &= cpu_to_le32((u32)mask);
>>  	} else
>> -		*bar = 0;
>> +		*vbar = 0;
>>  
>>  	vdev->bardirty = false;
>>  }
>> 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
>>
Andrew Murray Sept. 19, 2019, 8 a.m. UTC | #3
On Wed, Sep 18, 2019 at 05:31:33PM +0300, Denis Efremov wrote:
> On 9/18/19 12:17 PM, Andrew Murray wrote:
> > On Mon, Sep 16, 2019 at 11:41:49PM +0300, Denis Efremov wrote:
> >> Refactor loops to use idiomatic C style and avoid the fencepost error
> >> of using "i < PCI_STD_RESOURCE_END" when "i <= PCI_STD_RESOURCE_END"
> >> is required, e.g., commit 2f686f1d9bee ("PCI: Correct PCI_STD_RESOURCE_END
> >> usage").
> >>
> >> To iterate through all possible BARs, loop conditions changed to the
> >> *number* of BARs "i < PCI_STD_NUM_BARS", instead of the index of the last
> >> valid BAR "i <= PCI_STD_RESOURCE_END".
> >>
> >> Cc: Cornelia Huck <cohuck@redhat.com>
> >> Cc: Alex Williamson <alex.williamson@redhat.com>
> >> Signed-off-by: Denis Efremov <efremov@linux.com>
> >> ---
> >>  drivers/vfio/pci/vfio_pci.c         | 11 ++++++----
> >>  drivers/vfio/pci/vfio_pci_config.c  | 32 +++++++++++++++--------------
> >>  drivers/vfio/pci/vfio_pci_private.h |  4 ++--
> >>  3 files changed, 26 insertions(+), 21 deletions(-)
> >>
> >> diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
> >> index 703948c9fbe1..cb7d220d3246 100644
> >> --- a/drivers/vfio/pci/vfio_pci.c
> >> +++ b/drivers/vfio/pci/vfio_pci.c
> >> @@ -110,13 +110,15 @@ static inline bool vfio_pci_is_vga(struct pci_dev *pdev)
> >>  static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev)
> >>  {
> >>  	struct resource *res;
> >> -	int bar;
> >> +	int i;
> >>  	struct vfio_pci_dummy_resource *dummy_res;
> >>  
> >>  	INIT_LIST_HEAD(&vdev->dummy_resources_list);
> >>  
> >> -	for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
> >> -		res = vdev->pdev->resource + bar;
> >> +	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
> >> +		int bar = i + PCI_STD_RESOURCES;
> >> +
> >> +		res = &vdev->pdev->resource[bar];
> > 
> > Why can't we just drop PCI_STD_RESOURCES and replace it was 0. I understand
> > the abstraction here, but we don't do it elsewhere across the kernel. Is this
> > necessary?
> 
> There was a discussion about this particular case:
> https://lkml.org/lkml/2019/8/12/999
> 
> It was decided to save the original style for vfio drivers.

OK no problem.

Thanks,

Andrew Murray

> 
> > 
> > Thanks,
> > 
> > Andrew Murray
> > 
> >>  
> >>  		if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP))
> >>  			goto no_mmap;
> >> @@ -399,7 +401,8 @@ 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 (i = 0; i < PCI_STD_NUM_BARS; i++) {
> >> +		bar = i + PCI_STD_RESOURCES;
> >>  		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..90c0b80f8acf 100644
> >> --- a/drivers/vfio/pci/vfio_pci_config.c
> >> +++ b/drivers/vfio/pci/vfio_pci_config.c
> >> @@ -450,30 +450,32 @@ static void vfio_bar_fixup(struct vfio_pci_device *vdev)
> >>  {
> >>  	struct pci_dev *pdev = vdev->pdev;
> >>  	int i;
> >> -	__le32 *bar;
> >> +	__le32 *vbar;
> >>  	u64 mask;
> >>  
> >> -	bar = (__le32 *)&vdev->vconfig[PCI_BASE_ADDRESS_0];
> >> +	vbar = (__le32 *)&vdev->vconfig[PCI_BASE_ADDRESS_0];
> >>  
> >> -	for (i = PCI_STD_RESOURCES; i <= PCI_STD_RESOURCE_END; i++, bar++) {
> >> -		if (!pci_resource_start(pdev, i)) {
> >> -			*bar = 0; /* Unmapped by host = unimplemented to user */
> >> +	for (i = 0; i < PCI_STD_NUM_BARS; i++, vbar++) {
> >> +		int bar = i + PCI_STD_RESOURCES;
> >> +
> >> +		if (!pci_resource_start(pdev, bar)) {
> >> +			*vbar = 0; /* Unmapped by host = unimplemented to user */
> >>  			continue;
> >>  		}
> >>  
> >> -		mask = ~(pci_resource_len(pdev, i) - 1);
> >> +		mask = ~(pci_resource_len(pdev, bar) - 1);
> >>  
> >> -		*bar &= cpu_to_le32((u32)mask);
> >> -		*bar |= vfio_generate_bar_flags(pdev, i);
> >> +		*vbar &= cpu_to_le32((u32)mask);
> >> +		*vbar |= vfio_generate_bar_flags(pdev, bar);
> >>  
> >> -		if (*bar & cpu_to_le32(PCI_BASE_ADDRESS_MEM_TYPE_64)) {
> >> -			bar++;
> >> -			*bar &= cpu_to_le32((u32)(mask >> 32));
> >> +		if (*vbar & cpu_to_le32(PCI_BASE_ADDRESS_MEM_TYPE_64)) {
> >> +			vbar++;
> >> +			*vbar &= cpu_to_le32((u32)(mask >> 32));
> >>  			i++;
> >>  		}
> >>  	}
> >>  
> >> -	bar = (__le32 *)&vdev->vconfig[PCI_ROM_ADDRESS];
> >> +	vbar = (__le32 *)&vdev->vconfig[PCI_ROM_ADDRESS];
> >>  
> >>  	/*
> >>  	 * NB. REGION_INFO will have reported zero size if we weren't able
> >> @@ -483,14 +485,14 @@ static void vfio_bar_fixup(struct vfio_pci_device *vdev)
> >>  	if (pci_resource_start(pdev, PCI_ROM_RESOURCE)) {
> >>  		mask = ~(pci_resource_len(pdev, PCI_ROM_RESOURCE) - 1);
> >>  		mask |= PCI_ROM_ADDRESS_ENABLE;
> >> -		*bar &= cpu_to_le32((u32)mask);
> >> +		*vbar &= cpu_to_le32((u32)mask);
> >>  	} else if (pdev->resource[PCI_ROM_RESOURCE].flags &
> >>  					IORESOURCE_ROM_SHADOW) {
> >>  		mask = ~(0x20000 - 1);
> >>  		mask |= PCI_ROM_ADDRESS_ENABLE;
> >> -		*bar &= cpu_to_le32((u32)mask);
> >> +		*vbar &= cpu_to_le32((u32)mask);
> >>  	} else
> >> -		*bar = 0;
> >> +		*vbar = 0;
> >>  
> >>  	vdev->bardirty = false;
> >>  }
> >> 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..cb7d220d3246 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -110,13 +110,15 @@  static inline bool vfio_pci_is_vga(struct pci_dev *pdev)
 static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev)
 {
 	struct resource *res;
-	int bar;
+	int i;
 	struct vfio_pci_dummy_resource *dummy_res;
 
 	INIT_LIST_HEAD(&vdev->dummy_resources_list);
 
-	for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
-		res = vdev->pdev->resource + bar;
+	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
+		int bar = i + PCI_STD_RESOURCES;
+
+		res = &vdev->pdev->resource[bar];
 
 		if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP))
 			goto no_mmap;
@@ -399,7 +401,8 @@  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 (i = 0; i < PCI_STD_NUM_BARS; i++) {
+		bar = i + PCI_STD_RESOURCES;
 		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..90c0b80f8acf 100644
--- a/drivers/vfio/pci/vfio_pci_config.c
+++ b/drivers/vfio/pci/vfio_pci_config.c
@@ -450,30 +450,32 @@  static void vfio_bar_fixup(struct vfio_pci_device *vdev)
 {
 	struct pci_dev *pdev = vdev->pdev;
 	int i;
-	__le32 *bar;
+	__le32 *vbar;
 	u64 mask;
 
-	bar = (__le32 *)&vdev->vconfig[PCI_BASE_ADDRESS_0];
+	vbar = (__le32 *)&vdev->vconfig[PCI_BASE_ADDRESS_0];
 
-	for (i = PCI_STD_RESOURCES; i <= PCI_STD_RESOURCE_END; i++, bar++) {
-		if (!pci_resource_start(pdev, i)) {
-			*bar = 0; /* Unmapped by host = unimplemented to user */
+	for (i = 0; i < PCI_STD_NUM_BARS; i++, vbar++) {
+		int bar = i + PCI_STD_RESOURCES;
+
+		if (!pci_resource_start(pdev, bar)) {
+			*vbar = 0; /* Unmapped by host = unimplemented to user */
 			continue;
 		}
 
-		mask = ~(pci_resource_len(pdev, i) - 1);
+		mask = ~(pci_resource_len(pdev, bar) - 1);
 
-		*bar &= cpu_to_le32((u32)mask);
-		*bar |= vfio_generate_bar_flags(pdev, i);
+		*vbar &= cpu_to_le32((u32)mask);
+		*vbar |= vfio_generate_bar_flags(pdev, bar);
 
-		if (*bar & cpu_to_le32(PCI_BASE_ADDRESS_MEM_TYPE_64)) {
-			bar++;
-			*bar &= cpu_to_le32((u32)(mask >> 32));
+		if (*vbar & cpu_to_le32(PCI_BASE_ADDRESS_MEM_TYPE_64)) {
+			vbar++;
+			*vbar &= cpu_to_le32((u32)(mask >> 32));
 			i++;
 		}
 	}
 
-	bar = (__le32 *)&vdev->vconfig[PCI_ROM_ADDRESS];
+	vbar = (__le32 *)&vdev->vconfig[PCI_ROM_ADDRESS];
 
 	/*
 	 * NB. REGION_INFO will have reported zero size if we weren't able
@@ -483,14 +485,14 @@  static void vfio_bar_fixup(struct vfio_pci_device *vdev)
 	if (pci_resource_start(pdev, PCI_ROM_RESOURCE)) {
 		mask = ~(pci_resource_len(pdev, PCI_ROM_RESOURCE) - 1);
 		mask |= PCI_ROM_ADDRESS_ENABLE;
-		*bar &= cpu_to_le32((u32)mask);
+		*vbar &= cpu_to_le32((u32)mask);
 	} else if (pdev->resource[PCI_ROM_RESOURCE].flags &
 					IORESOURCE_ROM_SHADOW) {
 		mask = ~(0x20000 - 1);
 		mask |= PCI_ROM_ADDRESS_ENABLE;
-		*bar &= cpu_to_le32((u32)mask);
+		*vbar &= cpu_to_le32((u32)mask);
 	} else
-		*bar = 0;
+		*vbar = 0;
 
 	vdev->bardirty = false;
 }
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;