Hi Sinan,
On Mon, Mar 07, 2016 at 05:21:49PM -0500, Sinan Kaya wrote:
> The PCI_IOBASE needs to be released after hotplug removal so that it can be
> re-added back by the pci_remap_iospace function during insertion.
>
> Adding unmap function to follow IO remap function.
>
> Signed-off-by: Sinan Kaya <okaya@xxxxxxxxxxxxxx>
> ---
> drivers/pci/pci.c | 25 +++++++++++++++++++++++++
> include/linux/pci.h | 1 +
> 2 files changed, 26 insertions(+)
>
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 3a516c0..f5faed2 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -26,6 +26,7 @@
> #include <linux/device.h>
> #include <linux/pm_runtime.h>
> #include <linux/pci_hotplug.h>
> +#include <linux/vmalloc.h>
> #include <asm-generic/pci-bridge.h>
> #include <asm/setup.h>
> #include <linux/aer.h>
> @@ -3169,6 +3170,30 @@ int __weak pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr)
> #endif
> }
>
> +/**
> + * pci_unmap_iospace - Unmap the memory mapped I/O space
> + * @virt_addr: virtual address to be unmapped
> + * @size: size of the physical address to be unmapped
> + *
> + * Unmap the CPU virtual address @virt_addr from virtual address space.
> + * Only architectures that have memory mapped IO functions defined
> + * (and the PCI_IOBASE value defined) should call this function.
> + */
> +void __weak pci_unmap_iospace(struct resource *res)
Why is this weak? I assume probably because pci_remap_iospace() is
weak, but I don't see any reason why *that* needs to be weak. There's
only one implementation. I think neither one should be weak unless we
have an actual need for that.
> +{
> +#if defined(PCI_IOBASE) && defined(CONFIG_MMU)
> + unsigned long vaddr = (unsigned long)PCI_IOBASE + res->start;
> +
> + unmap_kernel_range(vaddr, resource_size(res));
There really aren't any other generic uses of unmap_kernel_range().
This isn't an unusual scenario, so I would expect this code to use a
pattern that's used elsewhere.
> +#else
> + /*
> + * This architecture does not have memory mapped I/O space,
> + * so this function should never be called.
> + */
> + WARN_ONCE(1, "This architecture does not support memory mapped I/O\n");
> +#endif
> +}
> +
> static void __pci_set_master(struct pci_dev *dev, bool enable)
> {
> u16 old_cmd, cmd;
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 398ae7e..c6e3f0e 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1172,6 +1172,7 @@ int pci_register_io_range(phys_addr_t addr, resource_size_t size);
> unsigned long pci_address_to_pio(phys_addr_t addr);
> phys_addr_t pci_pio_to_address(unsigned long pio);
> int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr);
> +void pci_unmap_iospace(struct resource *res);
>
> static inline pci_bus_addr_t pci_bus_address(struct pci_dev *pdev, int bar)
> {
> --
> 1.8.2.1
>
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