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Date:	Fri, 2 Jan 2015 11:55:33 +0000
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Cc:	Arnd Bergmann <arnd@...db.de>, Liviu Dudau <Liviu.Dudau@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Mark Rutland <Mark.Rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"jason@...edaemon.net" <jason@...edaemon.net>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Will Deacon <Will.Deacon@....com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>
Subject: Re: [RFC 2/4] PCI: generic: Add support for ARM64 and MSI(x)

Hi Suravee,

On Mon, Dec 29, 2014 at 07:32:44PM +0000, Suravee Suthikulpanit wrote:
> Hi,
> 
> I am not sure if this thread is still alive. I'm trying to see what I
> can do to help clean up/convert to make the PCI GHC also works for arm64
> w/ zero or minimal ifdefs.
> 
> Please let me know if someone is already working on this. I noticed that
> Lorenzo's patches has already been in 3.19-rc1, and in Bjorn's
> pci/domain branch. Otherwise, I'll try to continue the work based on the
> sample patch from Arnd here.

If I am not mistaken, the only bit missing to remove pci_sys_data (and so
having a generic host controller driver that works on ARM32/64) is generic
MSI management.

I know for certain Marc is working on it, and the solution is WIP,
I think we should prevent adding more churn to pci_sys_data, since
I managed to remove most of the dependencies (domain, mem_offset).

So to sum it up, to have a generic host controller driver for ARM32/64
we just need to work out how to handle the MSI data, patches will be
on the lists shortly to handle that, please review.

Thanks,
Lorenzo

> On 10/23/14 08:33, Arnd Bergmann wrote:
> > [...]
> > diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c
> > index 3d2076f59911..3542a7b740e5 100644
> > --- a/drivers/pci/host/pci-host-generic.c
> > +++ b/drivers/pci/host/pci-host-generic.c
> > @@ -40,16 +40,20 @@ struct gen_pci_cfg_windows {
> >
> >   struct gen_pci {
> >       struct pci_host_bridge                  host;
> > +     struct pci_sys_data                     sys;
> >       struct gen_pci_cfg_windows              cfg;
> > -     struct list_head                        resources;
> >   };
> 
> Arnd, based on the patch here, if we are trying to use the
> pci-host-generic driver on arm64, this means that we are going to have
> to introduce struct pci_sys_data for the arm64 as well (e.g move the
> struct from include/asm/mach/pci.h to include/linux/pci.h). Is this also
> your intention?
> 
> Thanks,
> 
> Suravee
> 
> >
> > +static inline struct gen_pci *gen_pci_from_sys(struct pci_sys_data *sys)
> > +{
> > +     return container_of(sys, struct gen_pci, sys);
> > +}
> > +
> >   static void __iomem *gen_pci_map_cfg_bus_cam(struct pci_bus *bus,
> >                                            unsigned int devfn,
> >                                            int where)
> >   {
> > -     struct pci_sys_data *sys = bus->sysdata;
> > -     struct gen_pci *pci = sys->private_data;
> > +     struct gen_pci *pci = gen_pci_from_sys(bus->sysdata);
> >       resource_size_t idx = bus->number - pci->cfg.bus_range.start;
> >
> >       return pci->cfg.win[idx] + ((devfn << 8) | where);
> > @@ -64,8 +68,7 @@ static void __iomem *gen_pci_map_cfg_bus_ecam(struct pci_bus *bus,
> >                                             unsigned int devfn,
> >                                             int where)
> >   {
> > -     struct pci_sys_data *sys = bus->sysdata;
> > -     struct gen_pci *pci = sys->private_data;
> > +     struct gen_pci *pci = gen_pci_from_sys(bus->sysdata);
> >       resource_size_t idx = bus->number - pci->cfg.bus_range.start;
> >
> >       return pci->cfg.win[idx] + ((devfn << 12) | where);
> > @@ -80,8 +83,7 @@ static int gen_pci_config_read(struct pci_bus *bus, unsigned int devfn,
> >                               int where, int size, u32 *val)
> >   {
> >       void __iomem *addr;
> > -     struct pci_sys_data *sys = bus->sysdata;
> > -     struct gen_pci *pci = sys->private_data;
> > +     struct gen_pci *pci = gen_pci_from_sys(bus->sysdata);
> >
> >       addr = pci->cfg.ops->map_bus(bus, devfn, where);
> >
> > @@ -103,8 +105,7 @@ static int gen_pci_config_write(struct pci_bus *bus, unsigned int devfn,
> >                                int where, int size, u32 val)
> >   {
> >       void __iomem *addr;
> > -     struct pci_sys_data *sys = bus->sysdata;
> > -     struct gen_pci *pci = sys->private_data;
> > +     struct gen_pci *pci = gen_pci_from_sys(bus->sysdata);
> >
> >       addr = pci->cfg.ops->map_bus(bus, devfn, where);
> >
> > @@ -181,10 +182,10 @@ static void gen_pci_release_of_pci_ranges(struct gen_pci *pci)
> >   {
> >       struct pci_host_bridge_window *win;
> >
> > -     list_for_each_entry(win, &pci->resources, list)
> > +     list_for_each_entry(win, &pci->sys.resources, list)
> >               release_resource(win->res);
> >
> > -     pci_free_resource_list(&pci->resources);
> > +     pci_free_resource_list(&pci->sys.resources);
> >   }
> >
> >   static int gen_pci_parse_request_of_pci_ranges(struct gen_pci *pci)
> > @@ -237,7 +238,7 @@ static int gen_pci_parse_request_of_pci_ranges(struct gen_pci *pci)
> >               if (err)
> >                       goto out_release_res;
> >
> > -             pci_add_resource_offset(&pci->resources, res, offset);
> > +             pci_add_resource_offset(&pci->sys.resources, res, offset);
> >       }
> >
> >       if (!res_valid) {
> > @@ -306,17 +307,10 @@ static int gen_pci_parse_map_cfg_windows(struct gen_pci *pci)
> >       }
> >
> >       /* Register bus resource */
> > -     pci_add_resource(&pci->resources, bus_range);
> > +     pci_add_resource(&pci->sys.resources, bus_range);
> >       return 0;
> >   }
> >
> > -static int gen_pci_setup(int nr, struct pci_sys_data *sys)
> > -{
> > -     struct gen_pci *pci = sys->private_data;
> > -     list_splice_init(&pci->resources, &sys->resources);
> > -     return 1;
> > -}
> > -
> >   static int gen_pci_probe(struct platform_device *pdev)
> >   {
> >       int err;
> > @@ -326,17 +320,12 @@ static int gen_pci_probe(struct platform_device *pdev)
> >       struct device *dev = &pdev->dev;
> >       struct device_node *np = dev->of_node;
> >       struct gen_pci *pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
> > -     struct hw_pci hw = {
> > -             .nr_controllers = 1,
> > -             .private_data   = (void **)&pci,
> > -             .setup          = gen_pci_setup,
> > -             .map_irq        = of_irq_parse_and_map_pci,
> > -             .ops            = &gen_pci_ops,
> > -     };
> >
> >       if (!pci)
> >               return -ENOMEM;
> >
> > +     pci->sys.map_irq        = of_irq_parse_and_map_pci,
> > +
> >       type = of_get_property(np, "device_type", NULL);
> >       if (!type || strcmp(type, "pci")) {
> >               dev_err(dev, "invalid \"device_type\" %s\n", type);
> > @@ -355,7 +344,7 @@ static int gen_pci_probe(struct platform_device *pdev)
> >       pci->cfg.ops = of_id->data;
> >       pci->host.dev.parent = dev;
> >       INIT_LIST_HEAD(&pci->host.windows);
> > -     INIT_LIST_HEAD(&pci->resources);
> > +     INIT_LIST_HEAD(&pci->sys.resources);
> >
> >       /* Parse our PCI ranges and request their resources */
> >       err = gen_pci_parse_request_of_pci_ranges(pci);
> > @@ -369,8 +358,12 @@ static int gen_pci_probe(struct platform_device *pdev)
> >               return err;
> >       }
> >
> > -     pci_common_init_dev(dev, &hw);
> > -     return 0;
> > +     pci_add_flags(PCI_REASSIGN_ALL_RSRC);
> > +     err = pci_init_single(dev, &pci->sys, NULL, &gen_pci_ops);
> > +     if (err)
> > +             gen_pci_release_of_pci_ranges(pci);
> > +
> > +     return err;
> >   }
> >
> >   static struct platform_driver gen_pci_driver = {
> > diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci-mvebu.c
> > index b1315e197ffb..e1381c0699be 100644
> > --- a/drivers/pci/host/pci-mvebu.c
> > +++ b/drivers/pci/host/pci-mvebu.c
> > @@ -99,6 +99,7 @@ struct mvebu_pcie_port;
> >   struct mvebu_pcie {
> >       struct platform_device *pdev;
> >       struct mvebu_pcie_port *ports;
> > +     struct pci_sys_data sysdata;
> >       struct msi_chip *msi;
> >       struct resource io;
> >       char io_name[30];
> > @@ -611,7 +612,7 @@ static int mvebu_sw_pci_bridge_write(struct mvebu_pcie_port *port,
> >
> >   static inline struct mvebu_pcie *sys_to_pcie(struct pci_sys_data *sys)
> >   {
> > -     return sys->private_data;
> > +     return container_of(sys, struct mvebu_pcie, sysdata);
> >   }
> >
> >   static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie,
> > @@ -718,11 +719,26 @@ static struct pci_ops mvebu_pcie_ops = {
> >       .write = mvebu_pcie_wr_conf,
> >   };
> >
> > -static int mvebu_pcie_setup(int nr, struct pci_sys_data *sys)
> > +/* FIXME: move the code around to avoid these */
> > +static struct pci_bus *mvebu_pcie_scan_bus(int nr, struct pci_sys_data *sys);
> > +static void mvebu_pcie_add_bus(struct pci_bus *bus);
> > +static resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev,
> > +                                              const struct resource *res,
> > +                                              resource_size_t start,
> > +                                              resource_size_t size,
> > +                                              resource_size_t align);
> > +
> > +static int mvebu_pcie_enable(struct mvebu_pcie *pcie)
> >   {
> > -     struct mvebu_pcie *pcie = sys_to_pcie(sys);
> >       int i;
> >       int domain = 0;
> > +     struct pci_sys_data *sys = &pcie->sysdata;
> > +
> > +     pcie->sysdata = (struct pci_sys_data) {
> > +             .map_irq        = of_irq_parse_and_map_pci,
> > +             .align_resource = mvebu_pcie_align_resource,
> > +             .add_bus        = mvebu_pcie_add_bus,
> > +     };
> >
> >   #ifdef CONFIG_PCI_DOMAINS
> >       domain = sys->domain;
> > @@ -738,11 +754,13 @@ static int mvebu_pcie_setup(int nr, struct pci_sys_data *sys)
> >       if (request_resource(&iomem_resource, &pcie->mem))
> >               return 0;
> >
> > +     INIT_LIST_HEAD(&sys->resources);
> >       if (resource_size(&pcie->realio) != 0) {
> >               if (request_resource(&ioport_resource, &pcie->realio)) {
> >                       release_resource(&pcie->mem);
> >                       return 0;
> >               }
> > +
> >               pci_add_resource_offset(&sys->resources, &pcie->realio,
> >                                       sys->io_offset);
> >       }
> > @@ -756,7 +774,9 @@ static int mvebu_pcie_setup(int nr, struct pci_sys_data *sys)
> >               mvebu_pcie_setup_hw(port);
> >       }
> >
> > -     return 1;
> > +     pci_add_flags(PCI_REASSIGN_ALL_RSRC);
> > +     return pci_init_single(&pcie->pdev->dev, &pcie->sysdata,
> > +                            mvebu_pcie_scan_bus, &mvebu_pcie_ops);
> >   }
> >
> >   static struct pci_bus *mvebu_pcie_scan_bus(int nr, struct pci_sys_data *sys)
> > @@ -810,24 +830,6 @@ static resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev,
> >               return start;
> >   }
> >
> > -static void mvebu_pcie_enable(struct mvebu_pcie *pcie)
> > -{
> > -     struct hw_pci hw;
> > -
> > -     memset(&hw, 0, sizeof(hw));
> > -
> > -     hw.nr_controllers = 1;
> > -     hw.private_data   = (void **)&pcie;
> > -     hw.setup          = mvebu_pcie_setup;
> > -     hw.scan           = mvebu_pcie_scan_bus;
> > -     hw.map_irq        = of_irq_parse_and_map_pci;
> > -     hw.ops            = &mvebu_pcie_ops;
> > -     hw.align_resource = mvebu_pcie_align_resource;
> > -     hw.add_bus        = mvebu_pcie_add_bus;
> > -
> > -     pci_common_init(&hw);
> > -}
> > -
> >   /*
> >    * Looks up the list of register addresses encoded into the reg =
> >    * <...> property for one that matches the given port/lane. Once
> > @@ -1066,9 +1068,7 @@ static int mvebu_pcie_probe(struct platform_device *pdev)
> >               pci_ioremap_io(i, pcie->io.start + i);
> >
> >       mvebu_pcie_msi_enable(pcie);
> > -     mvebu_pcie_enable(pcie);
> > -
> > -     return 0;
> > +     return mvebu_pcie_enable(pcie);
> >   }
> >
> >   static const struct of_device_id mvebu_pcie_of_match_table[] = {
> >
> 
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