[CC'ing RMK]
On Tue, Jul 28, 2015 at 08:17:18AM +0100, Zhou Wang wrote:
> On 2015/7/25 11:21, Zhou Wang wrote:
> > From: Gabriele Paoloni <gabriele.paoloni@xxxxxxxxxx>
> >
> > This patch is needed in order to unify the PCIe designware framework for ARM and
> > ARM64 architectures. In the PCIe designware unification process we are calling
> > pci_create_root_bus() passing a "sysdata" parameter that is the same for both
> > ARM and ARM64 and is of type "struct pcie_port*". In the ARM case this will
> > cause a problem with the function pcibios_align_resource(); in fact this will
> > cast "dev->sysdata" to "struct pci_sys_data*", whereas designware had passed a
> > "struct pcie_port*" pointer.
> >
> > This patch solves the issue by removing "align_resource" from "pci_sys_data"
> > struct and defining a static global function pointer in "bios32.c"
> >
> > Signed-off-by: Gabriele Paoloni <gabriele.paoloni@xxxxxxxxxx>
>
> Hi Arnd and Rob,
>
> What is your opinion about this patch? Gabriele adds a global pointer in bios32.c
> to store align_resource, so we could remove sys->align_resource in pcibios_align_resource.
>
> As Lorenzo mentioned in v4 series, this is a temporary solution before moving
> align_resource to host bridge structure.
>
> Any comments welcome.
The align_resource() pointer is just used in drivers/pci/host/pci-mvebu.c,
I would like the pci-mvebu.c maintainers to comment on this and test it, I
do not expect it to create any issue and might be a temporary solution to
make progress on ARM/ARM64 consolidation, it is a blocking point.
It would be good if Russell can have a look too, I do not see what
issue this can trigger given that is just used in:
drivers/pci/host/pci-mvebu.c
and a global pointer (not saying it is elegant, but it should work)
might be ok.
So yes, comments very welcome.
Thanks,
Lorenzo
>
> Thanks,
> Zhou
>
> > ---
> > arch/arm/include/asm/mach/pci.h | 5 -----
> > arch/arm/kernel/bios32.c | 12 ++++++++----
> > 2 files changed, 8 insertions(+), 9 deletions(-)
> >
> > diff --git a/arch/arm/include/asm/mach/pci.h b/arch/arm/include/asm/mach/pci.h
> > index 28b9bb3..8a4e4de 100644
> > --- a/arch/arm/include/asm/mach/pci.h
> > +++ b/arch/arm/include/asm/mach/pci.h
> > @@ -58,11 +58,6 @@ struct pci_sys_data {
> > /* IRQ mapping */
> > int (*map_irq)(const struct pci_dev *, u8, u8);
> > /* Resource alignement requirements */
> > - resource_size_t (*align_resource)(struct pci_dev *dev,
> > - const struct resource *res,
> > - resource_size_t start,
> > - resource_size_t size,
> > - resource_size_t align);
> > void *private_data; /* platform controller private data */
> > };
> >
> > diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
> > index fcbbbb1..4cdc64d 100644
> > --- a/arch/arm/kernel/bios32.c
> > +++ b/arch/arm/kernel/bios32.c
> > @@ -17,6 +17,11 @@
> > #include <asm/mach/pci.h>
> >
> > static int debug_pci;
> > +static resource_size_t (*align_resource)(struct pci_dev *dev,
> > + const struct resource *res,
> > + resource_size_t start,
> > + resource_size_t size,
> > + resource_size_t align) = NULL;
> >
> > #ifdef CONFIG_PCI_MSI
> > struct msi_controller *pcibios_msi_controller(struct pci_dev *dev)
> > @@ -468,7 +473,7 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw,
> > sys->busnr = busnr;
> > sys->swizzle = hw->swizzle;
> > sys->map_irq = hw->map_irq;
> > - sys->align_resource = hw->align_resource;
> > + align_resource = hw->align_resource;
> > INIT_LIST_HEAD(&sys->resources);
> >
> > if (hw->private_data)
> > @@ -589,7 +594,6 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
> > resource_size_t size, resource_size_t align)
> > {
> > struct pci_dev *dev = data;
> > - struct pci_sys_data *sys = dev->sysdata;
> > resource_size_t start = res->start;
> >
> > if (res->flags & IORESOURCE_IO && start & 0x300)
> > @@ -597,8 +601,8 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
> >
> > start = (start + align - 1) & ~(align - 1);
> >
> > - if (sys->align_resource)
> > - return sys->align_resource(dev, res, start, size, align);
> > + if (align_resource)
> > + return align_resource(dev, res, start, size, align);
> >
> > return start;
> > }
> >
>
>
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