[PATCH 1/7]: PCI revised (3) [PATCH 16/42]: PCI: PCI Error reporting callbacks

[linas <linas@austin.ibm.com>]

On Mon, Nov 07, 2005 at 01:37:29PM -0800, Greg KH was heard to remark:
> On Mon, Nov 07, 2005 at 03:21:28PM -0600, linas wrote:
> > +typedef int __bitwise pci_channel_state_t;
> 
> You don't have to use an enum anymore, just use a #define.

Per Linus's remarks about namespace pollution, I've kept the enums.

> > +typedef int __bitwise pers_result_t;
> 
> You should at least keep "pci" at the beginning to make it make
> more sense to people looking at it for the first time.

PCI_ERS and pci_ers, then.

I'm feeling like a blinkin' spammer, splatting out all these emails.

--linas

PCI Error Recovery: header file patch

Change enums and subroutine signatures to be strongly typed, per recent
discussion with GregKH. Also, change the acronym to the more unique, 
less generic "PCI-ERS" "PCI Error Recovery System".

Please apply.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>

--
Index: linux-2.6.14-mm1/include/linux/pci.h
===================================================================
--- linux-2.6.14-mm1.orig/include/linux/pci.h	2005-11-07 13:55:28.000000000 -0600
+++ linux-2.6.14-mm1/include/linux/pci.h	2005-11-07 16:34:29.790592784 -0600
@@ -82,10 +82,12 @@
  *  the pci device.  If some PCI bus between here and the pci device
  *  has crashed or locked up, this info is reflected here.
  */
+typedef int __bitwise pci_channel_state_t;
+
 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 */
+	pci_channel_io_normal = (__force pci_channel_state_t) 1,	/* I/O channel is in normal state */
+	pci_channel_io_frozen = (__force pci_channel_state_t) 2,	/* I/O to channel is blocked */
+	pci_channel_io_perm_failure = (__force pci_channel_state_t) 3,	/* PCI card is dead */
 };
 
 /*
@@ -121,7 +123,7 @@
 					   this is D0-D3, D0 being fully functional,
 					   and D3 being off. */
 
-	enum pci_channel_state error_state;	/* current connectivity state */
+	pci_channel_state_t error_state;	/* current connectivity state */
 	struct	device	dev;		/* Generic device interface */
 
 	/* device is compatible with these IDs */
@@ -245,35 +247,46 @@
 };
 
 /* ---------------------------------------------------------------- */
-/** PCI error recovery infrastructure.  If a PCI device driver provides
+/** PCI Error Recovery System (PCI-ERS).  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 will be driven to recovery
  *  when an error occurs.
  */
 
-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 */
+typedef int __bitwise pci_ers_result_t;
+
+enum pci_ers_result {
+	/* no result/none/not supported in device driver */
+	PCI_ERS_RESULT_NONE = (__force pci_ers_result_t) 1,
+	
+	/* Device driver can recover without slot reset */
+	PCI_ERS_RESULT_CAN_RECOVER = (__force pci_ers_result_t) 2,
+	
+	/* Device driver wants slot to be reset. */
+	PCI_ERS_RESULT_NEED_RESET = (__force pci_ers_result_t) 3,
+	
+	/* Device has completely failed, is unrecoverable */
+	PCI_ERS_RESULT_DISCONNECT = (__force pci_ers_result_t) 4,
+	
+	/* Device driver is fully recovered and operational */
+	PCI_ERS_RESULT_RECOVERED = (__force pci_ers_result_t) 5,
 };
 
 /* PCI bus error event callbacks */
 struct pci_error_handlers
 {
 	/* PCI bus error detected on this device */
-	int (*error_detected)(struct pci_dev *dev,
-	                      enum pci_channel_state error);
+	pci_ers_result_t (*error_detected)(struct pci_dev *dev,
+	                      pci_channel_state_t error);
 
 	/* MMIO has been re-enabled, but not DMA */
-	int (*mmio_enabled)(struct pci_dev *dev);
+	pci_ers_result_t (*mmio_enabled)(struct pci_dev *dev);
 
 	/* PCI Express link has been reset */
-	int (*link_reset)(struct pci_dev *dev);
+	pci_ers_result_t (*link_reset)(struct pci_dev *dev);
 
 	/* PCI slot has been reset */
-	int (*slot_reset)(struct pci_dev *dev);
+	pci_ers_result_t (*slot_reset)(struct pci_dev *dev);
 
 	/* Device driver may resume normal operations */
 	void (*resume)(struct pci_dev *dev);