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| author | Sinan Kaya <okaya@codeaurora.org> | 2016-06-10 21:55:11 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2016-06-10 15:42:23 -0500 |
| commit | 4d3f13845957a87729a324cce8509fad8826ef52 (patch) | |
| tree | ead7141034421a052ffe6d99bc7f205798cecbbe /drivers/pci/pci.c | |
| parent | 5c3d14f76fccd14f0882fe2a11e19534a11a1674 (diff) | |
| download | linux-4d3f13845957a87729a324cce8509fad8826ef52.tar.bz2 | |
PCI: Add pci_unmap_iospace() to unmap I/O resources
Add pci_unmap_iospace() to undo what pci_remap_iospace() did.
This is needed to support hotplug removal of host bridges that use
pci_remap_iospace().
[bhelgaas: changelog]
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 18 |
1 files changed, 18 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; |