From: Sinan Kaya <okaya@codeaurora.org>
Date: Fri, 10 Jun 2016 19:55:11 +0000 (+0200)
Subject: UPSTREAM: PCI: Add pci_unmap_iospace() to unmap I/O resources
X-Git-Tag: firefly_0821_release~314
X-Git-Url: http://plrg.eecs.uci.edu/git/?p=firefly-linux-kernel-4.4.55.git;a=commitdiff_plain;h=3694d7d0d05c328973cf1b88b4f7a54db6303d76;ds=sidebyside

UPSTREAM: 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().

Change-Id: Iee5d778cb8ddfedab59c55c227a8c60825786854
[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>
(cherry picked from 4d3f13845957a87729a324cce8509fad8826ef5)
Conflicts:
	drivers/pci/pci.c
---

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index e311a9bf2c90..b767915dcb4e 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -25,7 +25,7 @@
 #include <linux/device.h>
 #include <linux/pm_runtime.h>
 #include <linux/pci_hotplug.h>
-#include <asm-generic/pci-bridge.h>
+#include <linux/vmalloc.h>
 #include <asm/setup.h>
 #include <linux/aer.h>
 #include "pci.h"
@@ -3057,6 +3057,23 @@ 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 c51d2798643c..f6c1d9719338 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1156,6 +1156,7 @@ int __must_check pci_bus_alloc_resource(struct pci_bus *bus,
 
 
 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)
 {