linux-kernel - Re: [PATCH v11 04/60] sparc/PCI: Use correct offset for bus address to resource

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Date:	Fri, 06 May 2016 08:02:54 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Yinghai Lu <yinghai@...nel.org>,
	Bjorn Helgaas <helgaas@...nel.org>,
	David Miller <davem@...emloft.net>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Wei Yang <weiyang@...ux.vnet.ibm.com>, TJ <linux@....tj>,
	Yijing Wang <wangyijing@...wei.com>,
	Khalid Aziz <khalid.aziz@...cle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH v11 04/60] sparc/PCI: Use correct offset for bus address
 to resource

On Thu, 2016-05-05 at 08:53 -0700, Yinghai Lu wrote:
> For powerpc io port, we still need extra offset from resource address
> to final address.
> 
>      resource_size_t offset =
>          ((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT;
> 
> +    if (mmap_state == pci_mmap_io) {
> +        struct pci_controller *hose = pci_bus_to_host(dev->bus);
> +
> +        /* hose should never be NULL */
> +        offset += hose->io_base_phys -
> +              ((unsigned long)hose->io_base_virt - _IO_BASE);
> +    }
> 
>      vma->vm_pgoff = offset >> PAGE_SHIFT;
> 
> but sparc does not need that trick.

I'm not sure how sparc handles IO space but on powerpc, the IO resource
is not a physical address, it's a virtual address (coming from
ioremap). 

Cheers,
Ben.