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SubjectRe: [RFC 2/4] PCI: generic: Add support for ARM64 and MSI(x)
On Wed, Oct 22, 2014 at 09:52:19PM +0100, Arnd Bergmann wrote:
> On Wednesday 22 October 2014 16:59:14 Lorenzo Pieralisi wrote:
> > On Wed, Oct 01, 2014 at 10:38:45AM +0100, Arnd Bergmann wrote:
> >
> > [...]
> >
> > > The arm32 implementations of pci_domain_nr/pci_proc_domain can probably be
> > > removed if we change the arm32 pcibios_init_hw function to call the new
> > > interfaces that set the domain number.
> >
> > I wished, but it is a bit more complicated than I thought unfortunately,
> > mostly because some drivers, eg cns3xxx set the domain numbers
> > statically in pci_sys_data and this sets a chain of dependency that is
> > not easy to untangle. I think cns3xxx is the only legacy driver that "uses"
> > the domain number (in pci_sys_data) in a way that clashes with the
> > generic domain_nr implementation, I need to give it more thought.
>
> Just had a look at that driver, shouldn't be too hard to change, see below.

I like this!

One thing though ...

>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
>
> diff --git a/arch/arm/mach-cns3xxx/pcie.c b/arch/arm/mach-cns3xxx/pcie.c
> index 45d6bd09e6ef..aa4b9d7c52fd 100644
> --- a/arch/arm/mach-cns3xxx/pcie.c
> +++ b/arch/arm/mach-cns3xxx/pcie.c
> @@ -30,18 +30,15 @@ struct cns3xxx_pcie {
> unsigned int irqs[2];
> struct resource res_io;
> struct resource res_mem;
> - struct hw_pci hw_pci;
> -
> + int port;
> bool linked;
> };
>
> -static struct cns3xxx_pcie cns3xxx_pcie[]; /* forward decl. */
> -
> static struct cns3xxx_pcie *sysdata_to_cnspci(void *sysdata)
> {
> struct pci_sys_data *root = sysdata;
>
> - return &cns3xxx_pcie[root->domain];
> + return root->private_data;
> }
>
> static struct cns3xxx_pcie *pdev_to_cnspci(const struct pci_dev *dev)
> @@ -192,13 +189,7 @@ static struct cns3xxx_pcie cns3xxx_pcie[] = {
> .flags = IORESOURCE_MEM,
> },
> .irqs = { IRQ_CNS3XXX_PCIE0_RC, IRQ_CNS3XXX_PCIE0_DEVICE, },
> - .hw_pci = {
> - .domain = 0,
> - .nr_controllers = 1,
> - .ops = &cns3xxx_pcie_ops,
> - .setup = cns3xxx_pci_setup,
> - .map_irq = cns3xxx_pcie_map_irq,
> - },
> + .port = 0,
> },
> [1] = {
> .host_regs = (void __iomem *)CNS3XXX_PCIE1_HOST_BASE_VIRT,
> @@ -217,19 +208,13 @@ static struct cns3xxx_pcie cns3xxx_pcie[] = {
> .flags = IORESOURCE_MEM,
> },
> .irqs = { IRQ_CNS3XXX_PCIE1_RC, IRQ_CNS3XXX_PCIE1_DEVICE, },
> - .hw_pci = {
> - .domain = 1,
> - .nr_controllers = 1,
> - .ops = &cns3xxx_pcie_ops,
> - .setup = cns3xxx_pci_setup,
> - .map_irq = cns3xxx_pcie_map_irq,
> - },
> + .port = 1,
> },
> };
>
> static void __init cns3xxx_pcie_check_link(struct cns3xxx_pcie *cnspci)
> {
> - int port = cnspci->hw_pci.domain;
> + int port = cnspci->port;
> u32 reg;
> unsigned long time;
>
> @@ -260,9 +245,10 @@ static void __init cns3xxx_pcie_check_link(struct cns3xxx_pcie *cnspci)
>
> static void __init cns3xxx_pcie_hw_init(struct cns3xxx_pcie *cnspci)
> {
> - int port = cnspci->hw_pci.domain;
> + int port = cnspci->port;
> struct pci_sys_data sd = {
> .domain = port,
> + .private_data = cnspci,
> };
> struct pci_bus bus = {
> .number = 0,
> @@ -323,6 +309,14 @@ static int cns3xxx_pcie_abort_handler(unsigned long addr, unsigned int fsr,
> void __init cns3xxx_pcie_init_late(void)
> {
> int i;
> + void *private_data;
> + struct hw_pci hw_pci = {
> + .nr_controllers = 1,
> + .ops = &cns3xxx_pcie_ops,
> + .setup = cns3xxx_pci_setup,
> + .map_irq = cns3xxx_pcie_map_irq,
> + .private_data = &private_data,
> + };
>
> pcibios_min_io = 0;
> pcibios_min_mem = 0;
> @@ -335,7 +329,9 @@ void __init cns3xxx_pcie_init_late(void)
> cns3xxx_pwr_soft_rst(0x1 << PM_SOFT_RST_REG_OFFST_PCIE(i));
> cns3xxx_pcie_check_link(&cns3xxx_pcie[i]);
> cns3xxx_pcie_hw_init(&cns3xxx_pcie[i]);
> - pci_common_init(&cns3xxx_pcie[i].hw_pci);
> + hw_pci->domain = i;
> + private_data = &cns3xxx_pcie[i];

Is this dance with pointers absolutely necessary? Does gcc though dishes at you
for doing hw_pci->private_data = &cns3xxx_pcie[i] directly?

Best regards,
Liviu

> + pci_common_init(&hw_pci);
> }
>
> pci_assign_unassigned_resources();
>
>
>
>

--
====================
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---------------
¯\_(ツ)_/¯

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