[PATCH] Export OF device path for PCI devices

Here's a new version of the patch according to our discussion.

This allows the platform to add its own platform files to the
sysfs PCI device node through a "pcibios_add_platform_entries()"
call.

I added an empty pcibios_add_platform_entries() inline to all
archs that apparently have PCI and implemented the OF stuff for
ppc and ppc64. The name is still "devspec" for now, I doubt
it will conflict and that's consistent with our use of the
"devspec" name in other places.

arch/ppc/kernel/pci.c

@@ -1022,8 +1022,31 @@ pci_create_OF_bus_map(void)
 		prom_add_property(find_path_device("/"), of_prop);
 	}
 }
+
+static ssize_t pci_show_devspec(struct device *dev, char *buf)
+{
+	struct pci_dev *pdev;
+	struct device_node *np;
+
+	pdev = to_pci_dev (dev);
+	np = pci_device_to_OF_node(pdev);
+	if (np == NULL || np->full_name == NULL)
+		return 0;
+	return sprintf(buf, "%s", np->full_name);
+}
+static DEVICE_ATTR(devspec, S_IRUGO, pci_show_devspec, NULL);
+
 #endif /* CONFIG_PPC_OF */
 
+/* Add sysfs properties */
+void pcibios_add_platform_entries(struct pci_dev *dev)
+{
+#ifdef CONFIG_PPC_OF
+	device_create_file(&pdev->dev, &dev_attr_devspec);
+#endif /* CONFIG_PPC_OF */
+}
+
+
 #ifdef CONFIG_PPC_PMAC
 /*
  * This set of routines checks for PCI<->PCI bridges that have closed

arch/ppc64/kernel/pci.c

@@ -540,3 +540,25 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
 
 	return ret;
 }
+
+#ifdef CONFIG_PPC_PSERIES
+static ssize_t pci_show_devspec(struct device *dev, char *buf)
+{
+	struct pci_dev *pdev;
+	struct device_node *np;
+
+	pdev = to_pci_dev (dev);
+	np = pci_device_to_OF_node(pdev);
+	if (np == NULL || np->full_name == NULL)
+		return 0;
+	return sprintf(buf, "%s", np->full_name);
+}
+static DEVICE_ATTR(devspec, S_IRUGO, pci_show_devspec, NULL);
+#endif /* CONFIG_PPC_PSERIES */
+
+void pcibios_add_platform_entries(struct pci_dev *pdev)
+{
+#ifdef CONFIG_PPC_PSERIES
+	device_create_file(&pdev->dev, &dev_attr_devspec);
+#endif /* CONFIG_PPC_PSERIES */
+}

drivers/pci/pci-sysfs.c

@@ -180,4 +180,7 @@ void pci_create_sysfs_dev_files (struct pci_dev *pdev)
 	device_create_file (dev, &dev_attr_irq);
 	device_create_file (dev, &dev_attr_resource);
 	sysfs_create_bin_file(&dev->kobj, &pci_config_attr);
+
+	/* add platform-specific attributes */
+	pcibios_add_platform_entries(pdev);
 }

include/asm-alpha/pci.h

@@ -208,6 +208,10 @@ static inline int pci_name_bus(char *name, struct pci_bus *bus)
 	return 0;
 }
 
+static inline void pcibios_add_platform_entries(struct pci_dev *dev)
+{
+}
+
 #endif /* __KERNEL__ */
 
 /* Values for the `which' argument to sys_pciconfig_iobase.  */

include/asm-arm/pci.h

@@ -186,6 +186,10 @@ extern void
 pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
 			 struct resource *res);
 
+static inline void pcibios_add_platform_entries(struct pci_dev *dev)
+{
+}
+
 #endif /* __KERNEL__ */
  
 #endif

include/asm-h8300/pci.h

@@ -22,4 +22,8 @@ extern inline void pcibios_penalize_isa_irq(int irq)
 
 #define PCI_DMA_BUS_IS_PHYS	(1)
 
+static inline void pcibios_add_platform_entries(struct pci_dev *dev)
+{
+}
+
 #endif /* _ASM_H8300_PCI_H */

include/asm-i386/pci.h

@@ -89,6 +89,11 @@ pci_dac_dma_sync_single(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len,
 extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
 			       enum pci_mmap_state mmap_state, int write_combine);
 
+
+static inline void pcibios_add_platform_entries(struct pci_dev *dev)
+{
+}
+
 #endif /* __KERNEL__ */
 
 /* implement the pci_ DMA API in terms of the generic device dma_ one */

include/asm-ia64/pci.h

@@ -112,6 +112,10 @@ static inline int pci_name_bus(char *name, struct pci_bus *bus)
 	return 0;
 }
 
+static inline void pcibios_add_platform_entries(struct pci_dev *dev)
+{
+}
+
 /* generic pci stuff */
 #include <asm-generic/pci.h>
 

include/asm-m68k/pci.h

@@ -54,4 +54,8 @@ static inline void pcibios_penalize_isa_irq(int irq)
  */
 #define PCI_DMA_BUS_IS_PHYS	(1)
 
+static inline void pcibios_add_platform_entries(struct pci_dev *dev)
+{
+}
+
 #endif /* _ASM_M68K_PCI_H */

include/asm-m68knommu/pci.h

@@ -30,6 +30,10 @@ static inline int pci_dma_supported(struct pci_dev *hwdev, u64 mask)
  */
 #define pci_dac_dma_supported(pci_dev, mask) (0)
 
+static inline void pcibios_add_platform_entries(struct pci_dev *dev)
+{
+}
+
 #endif /* CONFIG_COMEMPCI */
 
 #endif /* M68KNOMMU_PCI_H */

include/asm-mips/pci.h

@@ -120,6 +120,10 @@ static inline void pci_dac_dma_sync_single(struct pci_dev *pdev,
 	dma_cache_wback_inv(addr, len);
 }
 
+static inline void pcibios_add_platform_entries(struct pci_dev *dev)
+{
+}
+
 #endif /* __KERNEL__ */
 
 /* implement the pci_ DMA API in terms of the generic device dma_ one */

include/asm-parisc/pci.h

@@ -196,4 +196,8 @@ extern void
 pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
 			 struct resource *res);
 
+static inline void pcibios_add_platform_entries(struct pci_dev *dev)
+{
+}
+
 #endif /* __ASM_PARISC_PCI_H */

include/asm-ppc/pci.h

@@ -282,6 +282,8 @@ extern void
 pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
 			struct resource *res);
 
+extern void pcibios_add_platform_entries(struct pci_dev *dev);
+
 #endif	/* __KERNEL__ */
 
 #endif /* __PPC_PCI_H */

include/asm-ppc64/pci.h

@@ -152,6 +152,8 @@ pcibios_fixup_device_resources(struct pci_dev *dev, struct pci_bus *bus);
 
 extern int pci_read_irq_line(struct pci_dev *dev);
 
+extern void pcibios_add_platform_entries(struct pci_dev *dev);
+
 #endif	/* __KERNEL__ */
 
 #endif /* __PPC64_PCI_H */

include/asm-sh/pci.h

@@ -256,6 +256,10 @@ extern void pcibios_fixup_irqs(void);
 extern int pciauto_assign_resources(int busno, struct pci_channel *hose);
 #endif
 
+static inline void pcibios_add_platform_entries(struct pci_dev *dev)
+{
+}
+
 #endif /* __KERNEL__ */
 
 /* generic pci stuff */

include/asm-sparc/pci.h

@@ -141,6 +141,10 @@ extern inline int pci_dma_supported(struct pci_dev *hwdev, u64 mask)
 
 #define pci_dac_dma_supported(dev, mask)	(0)
 
+static inline void pcibios_add_platform_entries(struct pci_dev *dev)
+{
+}
+
 #endif /* __KERNEL__ */
 
 /* generic pci stuff */

include/asm-sparc64/pci.h

@@ -215,6 +215,10 @@ extern void
 pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
 			struct pci_bus_region *region);
 
+static inline void pcibios_add_platform_entries(struct pci_dev *dev)
+{
+}
+
 #endif /* __KERNEL__ */
 
 #endif /* __SPARC64_PCI_H */

include/asm-v850/pci.h

@@ -76,4 +76,8 @@ extern void
 pci_free_consistent (struct pci_dev *pdev, size_t size, void *cpu_addr,
 		     dma_addr_t dma_addr);
 
+static inline void pcibios_add_platform_entries(struct pci_dev *dev)
+{
+}
+
 #endif /* __V850_PCI_H__ */

include/asm-x86_64/pci.h

@@ -263,6 +263,10 @@ pci_dac_dma_sync_single(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len,
 extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
 			       enum pci_mmap_state mmap_state, int write_combine);
 
+static inline void pcibios_add_platform_entries(struct pci_dev *dev)
+{
+}
+
 #endif /* __KERNEL__ */
 
 /* generic pci stuff */