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Date: Wed, 28 Feb 2018 17:07:48 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: David Woodhouse <dwmw@...zon.co.uk>
Cc: chris@...kel.net, jcmvbkbc@...il.com,
linux-xtensa@...ux-xtensa.org, bhelgaas@...gle.com,
linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH] xtensa: Use generic pci_mmap_resource_range()
On Mon, Feb 19, 2018 at 01:02:33PM +0000, David Woodhouse wrote:
> Commit f719582435 ("PCI: Add pci_mmap_resource_range() and use it for
> ARM64") added this generic function with the intent of using it
> everywhere and ultimately killing the old arch-specific implementations.
>
> Let's get on with that eradication...
>
> Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
Applied to pci/resource-mmap for v4.17, thanks!
Xtensa folks, let me know if you have applied this or would like to, and
I'll drop it.
> ---
> arch/xtensa/include/asm/pci.h | 7 ++--
> arch/xtensa/kernel/pci.c | 94 ++++---------------------------------------
> 2 files changed, 12 insertions(+), 89 deletions(-)
>
> diff --git a/arch/xtensa/include/asm/pci.h b/arch/xtensa/include/asm/pci.h
> index 5c83798..d5a8215 100644
> --- a/arch/xtensa/include/asm/pci.h
> +++ b/arch/xtensa/include/asm/pci.h
> @@ -44,9 +44,10 @@ extern struct pci_controller* pcibios_alloc_controller(void);
>
> #define PCI_DMA_BUS_IS_PHYS (1)
>
> -/* Tell drivers/pci/proc.c that we have pci_mmap_page_range() */
> -#define HAVE_PCI_MMAP 1
> -#define arch_can_pci_mmap_io() 1
> +/* Tell PCI code what kind of PCI resource mappings we support */
> +#define HAVE_PCI_MMAP 1
> +#define ARCH_GENERIC_PCI_MMAP_RESOURCE 1
> +#define arch_can_pci_mmap_io() 1
>
> #endif /* __KERNEL__ */
>
> diff --git a/arch/xtensa/kernel/pci.c b/arch/xtensa/kernel/pci.c
> index d981f01..b7c7a60 100644
> --- a/arch/xtensa/kernel/pci.c
> +++ b/arch/xtensa/kernel/pci.c
> @@ -39,7 +39,6 @@
> * pcibios_align_resource
> * pcibios_fixup_bus
> * pci_bus_add_device
> - * pci_mmap_page_range
> */
>
> struct pci_controller* pci_ctrl_head;
> @@ -258,98 +257,21 @@ pci_controller_num(struct pci_dev *dev)
> #endif /* CONFIG_PROC_FS */
>
> /*
> - * Platform support for /proc/bus/pci/X/Y mmap()s,
> - * modelled on the sparc64 implementation by Dave Miller.
> + * Platform support for /proc/bus/pci/X/Y mmap()s.
> * -- paulus.
> */
>
> -/*
> - * Adjust vm_pgoff of VMA such that it is the physical page offset
> - * corresponding to the 32-bit pci bus offset for DEV requested by the user.
> - *
> - * Basically, the user finds the base address for his device which he wishes
> - * to mmap. They read the 32-bit value from the config space base register,
> - * add whatever PAGE_SIZE multiple offset they wish, and feed this into the
> - * offset parameter of mmap on /proc/bus/pci/XXX for that device.
> - *
> - * Returns negative error code on failure, zero on success.
> - */
> -static __inline__ int
> -__pci_mmap_make_offset(struct pci_dev *dev, struct vm_area_struct *vma,
> - enum pci_mmap_state mmap_state)
> +int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma)
> {
> - struct pci_controller *pci_ctrl = (struct pci_controller*) dev->sysdata;
> - unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
> - unsigned long io_offset = 0;
> - int i, res_bit;
> + struct pci_controller *pci_ctrl = (struct pci_controller*) pdev->sysdata;
> + resource_size_t ioaddr = pci_resource_start(pdev, bar);
>
> if (pci_ctrl == 0)
> return -EINVAL; /* should never happen */
>
> - /* If memory, add on the PCI bridge address offset */
> - if (mmap_state == pci_mmap_mem) {
> - res_bit = IORESOURCE_MEM;
> - } else {
> - io_offset = (unsigned long)pci_ctrl->io_space.base;
> - offset += io_offset;
> - res_bit = IORESOURCE_IO;
> - }
> -
> - /*
> - * Check that the offset requested corresponds to one of the
> - * resources of the device.
> - */
> - for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
> - struct resource *rp = &dev->resource[i];
> - int flags = rp->flags;
> -
> - /* treat ROM as memory (should be already) */
> - if (i == PCI_ROM_RESOURCE)
> - flags |= IORESOURCE_MEM;
> -
> - /* Active and same type? */
> - if ((flags & res_bit) == 0)
> - continue;
> -
> - /* In the range of this resource? */
> - if (offset < (rp->start & PAGE_MASK) || offset > rp->end)
> - continue;
> -
> - /* found it! construct the final physical address */
> - if (mmap_state == pci_mmap_io)
> - offset += pci_ctrl->io_space.start - io_offset;
> - vma->vm_pgoff = offset >> PAGE_SHIFT;
> - return 0;
> - }
> -
> - return -EINVAL;
> -}
> + /* Convert to an offset within this PCI controller */
> + ioaddr -= (unsigned long)pci_ctrl->io_space.base;
>
> -/*
> - * Perform the actual remap of the pages for a PCI device mapping, as
> - * appropriate for this architecture. The region in the process to map
> - * is described by vm_start and vm_end members of VMA, the base physical
> - * address is found in vm_pgoff.
> - * The pci device structure is provided so that architectures may make mapping
> - * decisions on a per-device or per-bus basis.
> - *
> - * Returns a negative error code on failure, zero on success.
> - */
> -int pci_mmap_page_range(struct pci_dev *dev, int bar,
> - struct vm_area_struct *vma,
> - enum pci_mmap_state mmap_state,
> - int write_combine)
> -{
> - int ret;
> -
> - ret = __pci_mmap_make_offset(dev, vma, mmap_state);
> - if (ret < 0)
> - return ret;
> -
> - vma->vm_page_prot = pgprot_device(vma->vm_page_prot);
> -
> - ret = io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
> - vma->vm_end - vma->vm_start,vma->vm_page_prot);
> -
> - return ret;
> + vma->vm_pgoff += (ioaddr + pci_ctrl->io_space.start) >> PAGE_SHIFT;
> + return 0;
> }
> --
> 2.7.4
>
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