diff options
| author | Tomasz Nowicki <tn@semihalf.com> | 2016-05-30 17:14:16 +0200 |
|---|---|---|
| committer | Graeme Gregory <graeme.gregory@linaro.org> | 2016-06-07 14:09:23 +0100 |
| commit | ac169620d457d49a057cf55af3d8ed1f747acd61 (patch) | |
| tree | ead7141034421a052ffe6d99bc7f205798cecbbe | |
| parent | 8fa48f17825f0831a3bb9bf4753b59494b7a02b6 (diff) | |
pci: Add new function to unmap IO resources.
We need to release I/O resources so that the same I/O resources
can be allocated again (pci_remap_iospace), like in PCI hotplug removal
scenario. Therefore this patch implements new pci_unmap_iospace call which
unmaps I/O space as the symmetry to pci_remap_iospace.
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
| -rw-r--r-- | drivers/pci/pci.c | 18 | ||||
| -rw-r--r-- | include/linux/pci.h | 1 |
2 files changed, 19 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index c8b4dbdd1bdd..eb431b5c3685 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -25,6 +25,7 @@ #include <linux/device.h> #include <linux/pm_runtime.h> #include <linux/pci_hotplug.h> +#include <linux/vmalloc.h> #include <asm/setup.h> #include <linux/aer.h> #include "pci.h" @@ -3165,6 +3166,23 @@ 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 + * @res: resource to be unmapped + * + * Unmap the CPU virtual address @res from virtual address space. + * Only architectures that have memory mapped IO functions defined + * (and the PCI_IOBASE value defined) should call this function. + */ +void pci_unmap_iospace(struct resource *res) +{ +#if defined(PCI_IOBASE) && defined(CONFIG_MMU) + unsigned long vaddr = (unsigned long)PCI_IOBASE + res->start; + + unmap_kernel_range(vaddr, resource_size(res)); +#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 b67e4df20801..12349deb688c 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1167,6 +1167,7 @@ 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) { |