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| Started by | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> |
|---|---|
| First post | 2017-05-03 18:00 +0200 |
| Last post | 2017-05-03 18:10 +0200 |
| Articles | 2 — 2 participants |
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Re: [PATCH] ARM64/PCI: Allow userspace to mmap PCI resources Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2017-05-03 18:00 +0200
RE: [PATCH] ARM64/PCI: Allow userspace to mmap PCI resources Bharat Bhushan <bharat.bhushan@nxp.com> - 2017-05-03 18:10 +0200
| From | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> |
|---|---|
| Date | 2017-05-03 18:00 +0200 |
| Subject | Re: [PATCH] ARM64/PCI: Allow userspace to mmap PCI resources |
| Message-ID | <tD4R4-7ok-3@gated-at.bofh.it> |
On Wed, May 03, 2017 at 09:18:58PM +0530, Bharat Bhushan wrote:
> This patch allows user-space to mmap PCI resources. This
> patch is inline to arm32 bit implementation.
>
> Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
> ---
> arch/arm64/include/asm/pci.h | 4 ++++
> arch/arm64/kernel/pci.c | 19 +++++++++++++++++++
> 2 files changed, 23 insertions(+)
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/arch/arm64/include/asm/pci.h?id=f719582435afe9c7985206e42d804ea6aa315d33
>
> diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h
> index b9a7ba9..8a18915 100644
> --- a/arch/arm64/include/asm/pci.h
> +++ b/arch/arm64/include/asm/pci.h
> @@ -31,6 +31,10 @@ static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
> return -ENODEV;
> }
>
> +#define HAVE_PCI_MMAP
> +extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
> + enum pci_mmap_state mmap_state,
> + int write_combine);
> static inline int pci_proc_domain(struct pci_bus *bus)
> {
> return 1;
> diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
> index ce20f4c..2e45a83 100644
> --- a/arch/arm64/kernel/pci.c
> +++ b/arch/arm64/kernel/pci.c
> @@ -97,6 +97,25 @@ int pcibios_check_service_irqs(struct pci_dev *dev, int *irqs, int mask)
> return count;
> }
>
> +int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
> + enum pci_mmap_state mmap_state, int write_combine)
> +{
> + if (mmap_state == pci_mmap_io)
> + return -EINVAL;
> +
> + /*
> + * Mark this as IO
> + */
> + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
> +
> + if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
> + vma->vm_end - vma->vm_start,
> + vma->vm_page_prot))
> + return -EAGAIN;
> +
> + return 0;
> +}
> +
> /*
> * raw_pci_read/write - Platform-specific PCI config space access.
> */
> --
> 1.9.3
>
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| From | Bharat Bhushan <bharat.bhushan@nxp.com> |
|---|---|
| Date | 2017-05-03 18:10 +0200 |
| Message-ID | <tD50K-7GP-25@gated-at.bofh.it> |
| In reply to | #1635087 |
> -----Original Message-----
> From: Lorenzo Pieralisi [mailto:lorenzo.pieralisi@arm.com]
> Sent: Wednesday, May 03, 2017 9:29 PM
> To: Bharat Bhushan <bharat.bhushan@nxp.com>
> Cc: catalin.marinas@arm.com; will.deacon@arm.com;
> bhelgaas@google.com; linux-arm-kernel@lists.infradead.org; linux-
> kernel@vger.kernel.org
> Subject: Re: [PATCH] ARM64/PCI: Allow userspace to mmap PCI resources
>
> On Wed, May 03, 2017 at 09:18:58PM +0530, Bharat Bhushan wrote:
> > This patch allows user-space to mmap PCI resources. This patch is
> > inline to arm32 bit implementation.
> >
> > Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
> > ---
> > arch/arm64/include/asm/pci.h | 4 ++++
> > arch/arm64/kernel/pci.c | 19 +++++++++++++++++++
> > 2 files changed, 23 insertions(+)
>
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-
> next.git/commit/arch/arm64/include/asm/pci.h?id=f719582435afe9c7985206
> e42d804ea6aa315d33
Oh, I missed this patch series,
Thanks
-Bharat
>
> >
> > diff --git a/arch/arm64/include/asm/pci.h
> > b/arch/arm64/include/asm/pci.h index b9a7ba9..8a18915 100644
> > --- a/arch/arm64/include/asm/pci.h
> > +++ b/arch/arm64/include/asm/pci.h
> > @@ -31,6 +31,10 @@ static inline int pci_get_legacy_ide_irq(struct pci_dev
> *dev, int channel)
> > return -ENODEV;
> > }
> >
> > +#define HAVE_PCI_MMAP
> > +extern int pci_mmap_page_range(struct pci_dev *dev, struct
> vm_area_struct *vma,
> > + enum pci_mmap_state mmap_state,
> > + int write_combine);
> > static inline int pci_proc_domain(struct pci_bus *bus) {
> > return 1;
> > diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c index
> > ce20f4c..2e45a83 100644
> > --- a/arch/arm64/kernel/pci.c
> > +++ b/arch/arm64/kernel/pci.c
> > @@ -97,6 +97,25 @@ int pcibios_check_service_irqs(struct pci_dev *dev,
> int *irqs, int mask)
> > return count;
> > }
> >
> > +int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct
> *vma,
> > + enum pci_mmap_state mmap_state, int
> write_combine) {
> > + if (mmap_state == pci_mmap_io)
> > + return -EINVAL;
> > +
> > + /*
> > + * Mark this as IO
> > + */
> > + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
> > +
> > + if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
> > + vma->vm_end - vma->vm_start,
> > + vma->vm_page_prot))
> > + return -EAGAIN;
> > +
> > + return 0;
> > +}
> > +
> > /*
> > * raw_pci_read/write - Platform-specific PCI config space access.
> > */
> > --
> > 1.9.3
> >
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