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Re: [RFC PATCH 1/3] of/pci: dma-ranges to account highest possible host bridge dma_mask

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On Mon, Mar 27, 2017 at 8:16 PM, Rob Herring <robh@kernel.org> wrote:
> On Sat, Mar 25, 2017 at 12:31 AM, Oza Pawandeep <oza.oza@broadcom.com> wrote:
>> it is possible that PCI device supports 64-bit DMA addressing,
>> and thus it's driver sets device's dma_mask to DMA_BIT_MASK(64),
>> however PCI host bridge may have limitations on the inbound
>> transaction addressing. As an example, consider NVME SSD device
>> connected to iproc-PCIe controller.
>>
>> Currently, the IOMMU DMA ops only considers PCI device dma_mask
>> when allocating an IOVA. This is particularly problematic on
>> ARM/ARM64 SOCs where the IOMMU (i.e. SMMU) translates IOVA to
>> PA for in-bound transactions only after PCI Host has forwarded
>> these transactions on SOC IO bus. This means on such ARM/ARM64
>> SOCs the IOVA of in-bound transactions has to honor the addressing
>> restrictions of the PCI Host.
>>
>> current pcie frmework and of framework integration assumes dma-ranges
>> in a way where memory-mapped devices define their dma-ranges.
>> dma-ranges: (child-bus-address, parent-bus-address, length).
>>
>> but iproc based SOCs and even Rcar based SOCs has PCI world dma-ranges.
>> dma-ranges = <0x43000000 0x00 0x00 0x00 0x00 0x80 0x00>;
>
> If you implement a common function, then I expect to see other users
> converted to use it. There's also PCI hosts in arch/powerpc that parse
> dma-ranges.

the common function should be similar to what
of_pci_get_host_bridge_resources is doing right now.
it parses ranges property right now.

the new function would look look following.

of_pci_get_dma_ranges(struct device_node *dev, struct list_head *resources)
where resources would return the dma-ranges.

but right now if you see the patch, of_dma_configure calls the new
function, which actually returns the largest possible size.
so this new function has to be generic in a way where other PCI hosts
can use it. but certainly iproc(Broadcom SOC) , rcar based SOCs can
use it for sure.

although having powerpc using it;  is a separate exercise, since I do
not have any access to other PCI hosts such as powerpc. but we can
workout with them on thsi forum if required.

so overall, of_pci_get_dma_ranges has to serve following 2 purposes.

1) it has to return largest possible size to of_dma_configure to
generate largest possible dma_mask.

2) it also has to return resources (dma-ranges) parsed, to the users.

so to address above needs

of_pci_get_dma_ranges(struct device_node *dev, struct list_head
*resources, u64 *size)

dev -> device node.
resources -> dma-ranges in allocated list.
size -> highest possible size to generate possible dma_mask for
of_dma_configure.

let em know how this sounds.

Regards,
Oza.

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[RFC PATCH 1/3] of/pci: dma-ranges to account highest possible host bridge dma_mask Oza Pawandeep <oza.oza@broadcom.com> - 2017-03-25 06:40 +0100
  [RFC PATCH 3/3] of: fix node traversing in of_dma_get_range Oza Pawandeep <oza.oza@broadcom.com> - 2017-03-25 06:40 +0100
    Re: [RFC PATCH 3/3] of: fix node traversing in of_dma_get_range Rob Herring <robh@kernel.org> - 2017-03-27 16:40 +0200
      Re: [RFC PATCH 3/3] of: fix node traversing in of_dma_get_range Robin Murphy <robin.murphy@arm.com> - 2017-03-27 16:50 +0200
        Re: [RFC PATCH 3/3] of: fix node traversing in of_dma_get_range Oza Oza <oza.oza@broadcom.com> - 2017-03-28 07:00 +0200
  Re: [RFC PATCH 1/3] of/pci: dma-ranges to account highest possible  host bridge dma_mask Rob Herring <robh@kernel.org> - 2017-03-27 17:20 +0200
    Re: [RFC PATCH 1/3] of/pci: dma-ranges to account highest possible  host bridge dma_mask Oza Oza <oza.oza@broadcom.com> - 2017-03-28 07:30 +0200
      Re: [RFC PATCH 1/3] of/pci: dma-ranges to account highest possible  host bridge dma_mask Rob Herring <robh@kernel.org> - 2017-03-28 16:20 +0200
        Re: [RFC PATCH 1/3] of/pci: dma-ranges to account highest possible  host bridge dma_mask Oza Oza <oza.oza@broadcom.com> - 2017-03-30 12:20 +0200
      Re: [RFC PATCH 1/3] of/pci: dma-ranges to account highest possible  host bridge dma_mask Robin Murphy <robin.murphy@arm.com> - 2017-03-28 16:40 +0200
        Re: [RFC PATCH 1/3] of/pci: dma-ranges to account highest possible  host bridge dma_mask Oza Oza <oza.oza@broadcom.com> - 2017-03-29 06:50 +0200
          Re: [RFC PATCH 1/3] of/pci: dma-ranges to account highest possible  host bridge dma_mask Oza Oza <oza.oza@broadcom.com> - 2017-03-30 05:30 +0200

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