Messages in this thread Patch in this message | | | Date | Thu, 01 Sep 2005 14:42:10 +0900 | From | Hidetoshi Seto <> | Subject | [PATCH 2.6.13] IOCHK interface for I/O error handling/detecting |
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This patch implements IOCHK interfaces that enable PCI drivers to detect error and make their error handling easier.
Please refer archives if you need, e.g. http://lwn.net/Articles/139240/
Thanks, H.Seto
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
---
drivers/pci/pci.c | 2 ++ include/asm-generic/iomap.h | 32 ++++++++++++++++++++++++++++++++ 2 files changed, 34 insertions(+)
Index: linux-2.6.13/include/asm-generic/iomap.h =================================================================== --- linux-2.6.13.orig/include/asm-generic/iomap.h +++ linux-2.6.13/include/asm-generic/iomap.h @@ -65,4 +65,36 @@ struct pci_dev; extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max); extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
+/* + * IOMAP_CHECK provides additional interfaces for drivers to detect + * some IO errors, supports drivers having ability to recover errors. + * + * All works around iomap-check depends on the design of "iocookie" + * structure. Every architecture owning its iomap-check is free to + * define the actual design of iocookie to fit its special style. + */ +#ifndef HAVE_ARCH_IOMAP_CHECK +/* Dummy definition of default iocookie */ +typedef int iocookie; +#endif + +/* + * Clear/Read iocookie to check IO error while using iomap. + * + * Note that default iochk_clear-read pair interfaces don't have + * any effective error check, but some high-reliable platforms + * would provide useful information to you. + * And note that some action may be limited (ex. irq-unsafe) + * between the pair depend on the facility of the platform. + */ +#ifdef HAVE_ARCH_IOMAP_CHECK +extern void iochk_init(void); +extern void iochk_clear(iocookie *cookie, struct pci_dev *dev); +extern int iochk_read(iocookie *cookie); +#else +static inline void iochk_init(void) {} +static inline void iochk_clear(iocookie *cookie, struct pci_dev *dev) {} +static inline int iochk_read(iocookie *cookie) { return 0; } +#endif + #endif Index: linux-2.6.13/drivers/pci/pci.c =================================================================== --- linux-2.6.13.orig/drivers/pci/pci.c +++ linux-2.6.13/drivers/pci/pci.c @@ -777,6 +777,8 @@ static int __devinit pci_init(void) while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { pci_fixup_device(pci_fixup_final, dev); } + + iochk_init(); return 0; }
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