Re: [PATCH v7 0/3] Add support for PCI in AArch64

[Liviu Dudau <Liviu.Dudau@arm.com>]

On Tue, Apr 22, 2014 at 12:50:40PM +0100, Sandeepa Prabhu wrote:
> On 22 April 2014 15:41, Liviu Dudau <Liviu.Dudau@arm.com> wrote:
> > On Tue, Apr 22, 2014 at 09:58:28AM +0100, Sandeepa Prabhu wrote:
> >> On 14 March 2014 21:04, Liviu Dudau <Liviu.Dudau@arm.com> wrote:
> >> > Hi,
> >> >
> >> > This patch adds support for PCI to AArch64. It is based on my v7 patch
> >> > that adds support for creating generic host bridge structure from
> >> > device tree. With that in place, I was able to boot a platform that
> >> > has PCIe host bridge support and use a PCIe network card.
> >> Hi Liviu,
> >>
> >> Are these patches (including your other patchset for device tree host
> >> bridge support ) available on a public git repo I can checkout from?
> >
> > Yes, I have pushed them into git://linux-arm.org/linux-ld.git
> Thanks Liviu,
> Just to understand, is the X-gene PCIe
> (https://lwn.net/Articles/589733/) verified using the same patchset?

Tanmay can confirm, but I belive so.

Best regards,
Liviu

> 
> ~Sandeepa
> >
> > Best regards,
> > Liviu
> >
> >>
> >> Thanks,
> >> ~Sandeepa
> >>
> >> >
> >> > I have dropped the RFC tag from the subject as I now have the ambitious goal
> >> > of trying to get it mainlined.
> >> >
> >> > Changes from v6:
> >> >   - Guard the pci_domain_nr() inline implementation with #ifdef CONFIG_PCI as
> >> >     to avoid conflict with default empty version present in include/linux/pci.h.
> >> >     Thanks to Jingoo Han for catching this.
> >> >
> >> > Changes from v5:
> >> >   - Removed pcibios_fixup_bridge_ranges() as the week default version is fine.
> >> >   - Removed the ALIGN() call in pcibios_align_resource()
> >> >   - Stopped exporting pcibios_align_resource()
> >> >
> >> > Changes from v4:
> >> >   - Fixed the pci_domain_nr() implementation for arm64. Now we use
> >> >     find_pci_host_bride() to find the host bridge before we retrieve
> >> >     the domain number.
> >> >
> >> > Changes from v3:
> >> >   - Added Acks accumulated so far ;)
> >> >   - Still carrying Catalin's patch for moving the PCI_IO_BASE until it
> >> >     lands in linux-next or mainline, in order to ease applying the series
> >> >
> >> > Changes from v2:
> >> >   - Implement an arch specific version of pci_register_io_range() and
> >> >     pci_address_to_pio().
> >> >   - Return 1 from pci_proc_domain().
> >> >
> >> > Changes from v1:
> >> >   - Added Catalin's patch for moving the PCI_IO_BASE location and extend
> >> >     its size to 16MB
> >> >   - Integrated Arnd's version of pci_ioremap_io that uses a bitmap for
> >> >     keeping track of assigned IO space and returns an io_offset. At the
> >> >     moment the code is added in arch/arm64 but it can be moved in drivers/pci.
> >> >   - Added a fix for the generic ioport_map() function when !CONFIG_GENERIC_IOMAP
> >> >     as suggested by Arnd.
> >> >
> >> > v6 thread here: https://lkml.org/lkml/2014/3/5/41
> >> > v5 thread here: https://lkml.org/lkml/2014/3/4/307
> >> > v4 thread here: https://lkml.org/lkml/2014/3/3/298
> >> > v3 thread here: https://lkml.org/lkml/2014/2/28/211
> >> > v2 thread here: https://lkml.org/lkml/2014/2/27/255
> >> > v1 thread here: https://lkml.org/lkml/2014/2/3/389
> >> >
> >> >
> >> > The API used is different from the one used by ARM architecture. There is
> >> > no pci_common_init_dev() function and no hw_pci structure, as that is no
> >> > longer needed. Once the last signature is added to the legal agreement, I
> >> > will post the host bridge driver code that I am using. Meanwhile, here
> >> > is an example of what the probe function looks like, posted as an example:
> >> >
> >> > static int myhostbridge_probe(struct platform_device *pdev)
> >> > {
> >> >         int err;
> >> >         struct device_node *dev;
> >> >         struct pci_host_bridge *bridge;
> >> >         struct myhostbridge_port *pp;
> >> >         resource_size_t lastbus;
> >> >
> >> >         dev = pdev->dev.of_node;
> >> >
> >> >         if (!of_device_is_available(dev)) {
> >> >                 pr_warn("%s: disabled\n", dev->full_name);
> >> >                 return -ENODEV;
> >> >         }
> >> >
> >> >         pp = kzalloc(sizeof(struct myhostbridge_port), GFP_KERNEL);
> >> >         if (!pp)
> >> >                 return -ENOMEM;
> >> >
> >> >         bridge = of_create_pci_host_bridge(&pdev->dev, &myhostbridge_ops, pp);
> >> >         if (IS_ERR(bridge)) {
> >> >                 err = PTR_ERR(bridge);
> >> >                 goto bridge_create_fail;
> >> >         }
> >> >
> >> >         err = myhostbridge_setup(bridge->bus);
> >> >         if (err)
> >> >                 goto bridge_setup_fail;
> >> >
> >> >         /* We always enable PCI domains and we keep domain 0 backward
> >> >          * compatible in /proc for video cards
> >> >          */
> >> >         pci_add_flags(PCI_ENABLE_PROC_DOMAINS);
> >> >         pci_add_flags(PCI_REASSIGN_ALL_BUS | PCI_REASSIGN_ALL_RSRC);
> >> >
> >> >         lastbus = pci_scan_child_bus(bridge->bus);
> >> >         pci_bus_update_busn_res_end(bridge->bus, lastbus);
> >> >
> >> >         pci_assign_unassigned_bus_resources(bridge->bus);
> >> >
> >> >         pci_bus_add_devices(bridge->bus);
> >> >
> >> >         return 0;
> >> >
> >> > bridge_setup_fail:
> >> >         put_device(&bridge->dev);
> >> >         device_unregister(&bridge->dev);
> >> > bridge_create_fail:
> >> >         kfree(pp);
> >> >         return err;
> >> > }
> >> >
> >> > Best regards,
> >> > Liviu
> >> >
> >> >
> >> > Catalin Marinas (1):
> >> >   arm64: Extend the PCI I/O space to 16MB
> >> >
> >> > Liviu Dudau (2):
> >> >   Fix ioport_map() for !CONFIG_GENERIC_IOMAP cases.
> >> >   arm64: Add architecture support for PCI
> >> >
> >> >  Documentation/arm64/memory.txt |  16 +--
> >> >  arch/arm64/Kconfig             |  19 +++-
> >> >  arch/arm64/include/asm/Kbuild  |   1 +
> >> >  arch/arm64/include/asm/io.h    |   5 +-
> >> >  arch/arm64/include/asm/pci.h   |  51 +++++++++
> >> >  arch/arm64/kernel/Makefile     |   1 +
> >> >  arch/arm64/kernel/pci.c        | 173 +++++++++++++++++++++++++++++++
> >> >  include/asm-generic/io.h       |   2 +-
> >> >  8 files changed, 258 insertions(+), 10 deletions(-)
> >> >  create mode 100644 arch/arm64/include/asm/pci.h
> >> >  create mode 100644 arch/arm64/kernel/pci.c
> >> >
> >> > --
> >> > 1.9.0
> >> >
> >> >
> >> > _______________________________________________
> >> > linux-arm-kernel mailing list
> >> > linux-arm-kernel@lists.infradead.org
> >> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> >>
> >
> > --
> > ====================
> > | I would like to |
> > | fix the world,  |
> > | but they're not |
> > | giving me the   |
> >  \ source code!  /
> >   ---------------
> >     ¯\_(ツ)_/¯
> >
> --
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-- 
====================
| I would like to |
| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
  ---------------
    ¯\_(ツ)_/¯