pci-err-1-pci.h.patch
This patch adds PCI error recovery callbacks, error state and
error return codes to include/linux/pci.h. These are closely
described in the next patch, a documentation file.
Signed-off-by: Linas Vepstas <[email protected]>
--- linux-2.6.12-git10/include/linux/pci.h.linas-orig 2005-06-17 14:48:29.000000000 -0500
+++ linux-2.6.12-git10/include/linux/pci.h 2005-06-24 14:44:59.000000000 -0500
@@ -660,6 +660,37 @@ struct pci_dynids {
unsigned int use_driver_data:1; /* pci_driver->driver_data is used */
};
+/* ---------------------------------------------------------------- */
+/** PCI error recovery infrastructure. If a PCI device driver provides
+ * a set fof callbacks in struct pci_error_handlers, then that device driver
+ * will be notified of PCI bus errors, and can be driven to recovery.
+ */
+
+enum pci_channel_state {
+ pci_channel_io_normal = 0, /* I/O channel is in normal state */
+ pci_channel_io_frozen = 1, /* I/O to channel is blocked */
+ pci_channel_io_perm_failure, /* pci card is dead */
+};
+
+enum pcierr_result {
+ PCIERR_RESULT_NONE=0, /* no result/none/not supported in device driver */
+ PCIERR_RESULT_CAN_RECOVER=1, /* Device driver can recover without slot reset */
+ PCIERR_RESULT_NEED_RESET, /* Device driver wants slot to be reset. */
+ PCIERR_RESULT_DISCONNECT, /* Device has completely failed, is unrecoverable */
+ PCIERR_RESULT_RECOVERED, /* Device driver is fully recovered and operational */
+};
+
+/* PCI bus error event callbacks */
+struct pci_error_handlers
+{
+ enum pci_channel_state error_state; /* current error state */
+ int (*error_detected)(struct pci_dev *dev, enum pci_channel_state error);
+ int (*mmio_enabled)(struct pci_dev *dev); /* MMIO has been reanbled, but not DMA */
+ int (*link_reset)(struct pci_dev *dev); /* PCI Express link has been reset */
+ int (*slot_reset)(struct pci_dev *dev); /* PCI slot has been reset */
+ void (*resume)(struct pci_dev *dev); /* Device driver may resume normal operations */
+};
+
struct module;
struct pci_driver {
struct list_head node;
@@ -673,6 +704,7 @@ struct pci_driver {
int (*enable_wake) (struct pci_dev *dev, pci_power_t state, int enable); /* Enable wake event */
void (*shutdown) (struct pci_dev *dev);
+ struct pci_error_handlers err_handler;
struct device_driver driver;
struct pci_dynids dynids;
};
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