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)
+{
+#if defined(PCI_IOBASE) && defined(CONFIG_MMU)
+ unsigned long vaddr = (unsigned long)PCI_IOBASE + res->start;
+
+ unmap_kernel_range(vaddr, resource_size(res));
+#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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