netdev - [PATCH] PCI: export pci_restore_msi

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Date:	Wed, 7 Nov 2007 15:43:59 -0600
From:	linas@...tin.ibm.com (Linas Vepstas)
To:	"David S. Miller" <davem@...emloft.net>
Cc:	linux-pci@...ey.karlin.mff.cuni.cz, netdev@...r.kernel.org,
	mcarlson@...adcom.com, wenxiong@...ibm.com, mchan@...adcom.com,
	"Kok, Auke" <auke-jan.h.kok@...el.com>
Subject: [PATCH] PCI: export pci_restore_msi_state()


PCI error recovery usually involves the PCI adapter being reset.
If the device is using MSI, the reset will cause the MSI state 
to be lost; the device driver needs to restore the MSI state.

The pci_restore_msi_state() routine is currently protected
by CONFIG_PM; remove this, and also export the symbol, so
that it can be used in a modle.

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

----
I am so sorry I wasn't able to send this 3 weeks ago, when
I first wrote the patch. There was simply no functional
hardware available to actually run this stuff :-(

Patches that use this, including those for tg3 and e1000e and ixgbe
i.e. MSI-using drivers, are to follow "real soon now". 

 drivers/pci/msi.c   |    3 +--
 drivers/pci/pci.h   |    6 ------
 include/linux/pci.h |    2 ++
 3 files changed, 3 insertions(+), 8 deletions(-)

Index: linux-2.6.23-rc8-mm1/drivers/pci/msi.c
===================================================================
--- linux-2.6.23-rc8-mm1.orig/drivers/pci/msi.c	2007-10-16 15:14:20.000000000 -0500
+++ linux-2.6.23-rc8-mm1/drivers/pci/msi.c	2007-10-16 15:14:42.000000000 -0500
@@ -224,7 +224,6 @@ static struct msi_desc* alloc_msi_entry(
 	return entry;
 }
 
-#ifdef CONFIG_PM
 static void __pci_restore_msi_state(struct pci_dev *dev)
 {
 	int pos;
@@ -282,7 +281,7 @@ void pci_restore_msi_state(struct pci_de
 	__pci_restore_msi_state(dev);
 	__pci_restore_msix_state(dev);
 }
-#endif	/* CONFIG_PM */
+EXPORT_SYMBOL_GPL(pci_restore_msi_state);
 
 /**
  * msi_capability_init - configure device's MSI capability structure
Index: linux-2.6.23-rc8-mm1/drivers/pci/pci.h
===================================================================
--- linux-2.6.23-rc8-mm1.orig/drivers/pci/pci.h	2007-10-16 15:14:20.000000000 -0500
+++ linux-2.6.23-rc8-mm1/drivers/pci/pci.h	2007-10-16 15:19:33.000000000 -0500
@@ -45,12 +45,6 @@ static inline void pci_no_msi(void) { }
 static inline void pci_msi_init_pci_dev(struct pci_dev *dev) { }
 #endif
 
-#if defined(CONFIG_PCI_MSI) && defined(CONFIG_PM)
-void pci_restore_msi_state(struct pci_dev *dev);
-#else
-static inline void pci_restore_msi_state(struct pci_dev *dev) {}
-#endif
-
 static inline int pci_no_d1d2(struct pci_dev *dev)
 {
 	unsigned int parent_dstates = 0;
Index: linux-2.6.23-rc8-mm1/include/linux/pci.h
===================================================================
--- linux-2.6.23-rc8-mm1.orig/include/linux/pci.h	2007-10-01 13:26:38.000000000 -0500
+++ linux-2.6.23-rc8-mm1/include/linux/pci.h	2007-10-16 15:19:07.000000000 -0500
@@ -665,6 +665,7 @@ static inline int pci_enable_msix(struct
 	struct msix_entry *entries, int nvec) {return -1;}
 static inline void pci_disable_msix(struct pci_dev *dev) {}
 static inline void msi_remove_pci_irq_vectors(struct pci_dev *dev) {}
+static inline void pci_restore_msi_state(struct pci_dev *dev) {}
 #else
 extern int pci_enable_msi(struct pci_dev *dev);
 extern void pci_disable_msi(struct pci_dev *dev);
@@ -672,6 +673,7 @@ extern int pci_enable_msix(struct pci_de
 	struct msix_entry *entries, int nvec);
 extern void pci_disable_msix(struct pci_dev *dev);
 extern void msi_remove_pci_irq_vectors(struct pci_dev *dev);
+extern void pci_restore_msi_state(struct pci_dev *dev);
 #endif
 
 #ifdef CONFIG_HT_IRQ
-
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