arch: fix ioport mapping on mips,sh

Kevin Cernekee reported that recent cleanup
 that replaced pci_iomap with a generic function
 failed to take into account the differences
 in io port handling on mips and sh architectures.
 
 Rather than revert the changes reintroducing the
 code duplication, this patchset fixes this
 by adding ability for architectures to override
 ioport mapping for pci devices.
 
 Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

arch: fix ioport mapping on mips,sh

Kevin Cernekee reported that recent cleanup that replaced pci_iomap with
a generic function failed to take into account the differences in io
port handling on mips and sh architectures.

Rather than revert the changes reintroducing the code duplication, this
patchset fixes this by adding ability for architectures to override
ioport mapping for pci devices.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  sh: use the the PCI channels's io_map_base
  mips: use the the PCI controller's io_map_base
  lib: add NO_GENERIC_PCI_IOPORT_MAP

arch/mips/Kconfig

@@ -2356,6 +2356,7 @@ config PCI
 	depends on HW_HAS_PCI
 	select PCI_DOMAINS
 	select GENERIC_PCI_IOMAP
+	select NO_GENERIC_PCI_IOPORT_MAP
 	help
 	  Find out whether you have a PCI motherboard. PCI is the name of a
 	  bus system, i.e. the way the CPU talks to the other stuff inside

arch/mips/lib/iomap-pci.c

@@ -10,8 +10,8 @@
 #include <linux/module.h>
 #include <asm/io.h>
 
-static void __iomem *ioport_map_pci(struct pci_dev *dev,
-                                     unsigned long port, unsigned int nr)
+void __iomem *__pci_ioport_map(struct pci_dev *dev,
+			       unsigned long port, unsigned int nr)
 {
 	struct pci_controller *ctrl = dev->bus->sysdata;
 	unsigned long base = ctrl->io_map_base;

arch/sh/Kconfig

@@ -859,6 +859,7 @@ config PCI
 	depends on SYS_SUPPORTS_PCI
 	select PCI_DOMAINS
 	select GENERIC_PCI_IOMAP
+	select NO_GENERIC_PCI_IOPORT_MAP
 	help
 	  Find out whether you have a PCI motherboard. PCI is the name of a
 	  bus system, i.e. the way the CPU talks to the other stuff inside

arch/sh/drivers/pci/pci.c

@@ -356,8 +356,8 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
 
 #ifndef CONFIG_GENERIC_IOMAP
 
-static void __iomem *ioport_map_pci(struct pci_dev *dev,
-				    unsigned long port, unsigned int nr)
+void __iomem *__pci_ioport_map(struct pci_dev *dev,
+			       unsigned long port, unsigned int nr)
 {
 	struct pci_channel *chan = dev->sysdata;
 

include/asm-generic/pci_iomap.h

@@ -15,6 +15,16 @@ struct pci_dev;
 #ifdef CONFIG_PCI
 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
+/* Create a virtual mapping cookie for a port on a given PCI device.
+ * Do not call this directly, it exists to make it easier for architectures
+ * to override */
+#ifdef CONFIG_NO_GENERIC_PCI_IOPORT_MAP
+extern void __iomem *__pci_ioport_map(struct pci_dev *dev, unsigned long port,
+				      unsigned int nr);
+#else
+#define __pci_ioport_map(dev, port, nr) ioport_map((port), (nr))
+#endif
+
 #else
 static inline void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max)
 {

lib/Kconfig

@@ -19,6 +19,9 @@ config RATIONAL
 config GENERIC_FIND_FIRST_BIT
 	bool
 
+config NO_GENERIC_PCI_IOPORT_MAP
+	bool
+
 config GENERIC_PCI_IOMAP
 	bool
 

lib/pci_iomap.c

@@ -34,7 +34,7 @@ void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
 	if (maxlen && len > maxlen)
 		len = maxlen;
 	if (flags & IORESOURCE_IO)
-		return ioport_map(start, len);
+		return __pci_ioport_map(dev, start, len);
 	if (flags & IORESOURCE_MEM) {
 		if (flags & IORESOURCE_CACHEABLE)
 			return ioremap(start, len);