[RFC 2/4] PCI: generic: Add support for ARM64 and MSI(x)

Suravee Suthikulpanit
2014-12-29T19:32:44Z

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.

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[] = {
>