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Date:	Wed,  2 Oct 2013 12:48:24 +0200
From:	Alexander Gordeev <>
Cc:	Alexander Gordeev <>,
	Bjorn Helgaas <>,
	Ralf Baechle <>,
	Michael Ellerman <>,
	Benjamin Herrenschmidt <>,
	Martin Schwidefsky <>,
	Ingo Molnar <>, Tejun Heo <>,
	Dan Williams <>,
	Andy King <>, Jon Mason <>,
	Matt Porter <>,,,,,,,,,,,,,,
	Solarflare linux maintainers <>,
	"VMware, Inc." <>,
Subject: [PATCH RFC 08/77] PCI/MSI: Get rid of pci_enable_msi_block_auto() interface

As result of recent re-design of MSI/MSI-X interrupts enabling
pattern pci_enable_msi_block_auto() interface became obsolete.

To enable maximum number of MSI interrupts for a device the
driver will first obtain that number from pci_get_msi_cap()
function and then call pci_enable_msi_block() interface.

Signed-off-by: Alexander Gordeev <>
 Documentation/PCI/MSI-HOWTO.txt |   30 ++----------------------------
 drivers/pci/msi.c               |   20 --------------------
 include/linux/pci.h             |    7 -------
 3 files changed, 2 insertions(+), 55 deletions(-)

diff --git a/Documentation/PCI/MSI-HOWTO.txt b/Documentation/PCI/MSI-HOWTO.txt
index 40abcfb..4d0525f 100644
--- a/Documentation/PCI/MSI-HOWTO.txt
+++ b/Documentation/PCI/MSI-HOWTO.txt
@@ -133,33 +133,7 @@ static int foo_driver_enable_msi(struct foo_adapter *adapter, int nvec)
 	return rc;
-4.2.3 pci_enable_msi_block_auto
-int pci_enable_msi_block_auto(struct pci_dev *dev, unsigned int *count)
-This variation on pci_enable_msi() call allows a device driver to request
-the maximum possible number of MSIs.  The MSI specification only allows
-interrupts to be allocated in powers of two, up to a maximum of 2^5 (32).
-If this function returns a positive number, it indicates that it has
-succeeded and the returned value is the number of allocated interrupts. In
-this case, the function enables MSI on this device and updates dev->irq to
-be the lowest of the new interrupts assigned to it.  The other interrupts
-assigned to the device are in the range dev->irq to dev->irq + returned
-value - 1.
-If this function returns a negative number, it indicates an error and
-the driver should not attempt to request any more MSI interrupts for
-this device.
-If the device driver needs to know the number of interrupts the device
-supports it can pass the pointer count where that number is stored. The
-device driver must decide what action to take if pci_enable_msi_block_auto()
-succeeds, but returns a value less than the number of interrupts supported.
-If the device driver does not need to know the number of interrupts
-supported, it can set the pointer count to NULL.
-4.2.4 pci_disable_msi
+4.2.3 pci_disable_msi
 void pci_disable_msi(struct pci_dev *dev)
@@ -175,7 +149,7 @@ on any interrupt for which it previously called request_irq().
 Failure to do so results in a BUG_ON(), leaving the device with
 MSI enabled and thus leaking its vector.
-4.2.5 pci_get_msi_cap
+4.2.4 pci_get_msi_cap
 int pci_get_msi_cap(struct pci_dev *dev)
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 583ace1..1934519 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -849,26 +849,6 @@ int pci_enable_msi_block(struct pci_dev *dev, unsigned int nvec)
-int pci_enable_msi_block_auto(struct pci_dev *dev, unsigned int *maxvec)
-	int ret, nvec;
-	ret = pci_get_msi_cap(dev);
-	if (ret < 0)
-		return ret;
-	if (maxvec)
-		*maxvec = ret;
-	nvec = ret;
-	ret = pci_enable_msi_block(dev, nvec);
-	if (ret)
-		return ret;
-	return nvec;
 void pci_msi_shutdown(struct pci_dev *dev)
 	struct msi_desc *desc;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 2fa92ef..13bf88d 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1154,12 +1154,6 @@ static inline int pci_enable_msi_block(struct pci_dev *dev, unsigned int nvec)
 	return -1;
-static inline int
-pci_enable_msi_block_auto(struct pci_dev *dev, unsigned int *maxvec)
-	return -1;
 static inline void pci_msi_shutdown(struct pci_dev *dev)
 { }
 static inline void pci_disable_msi(struct pci_dev *dev)
@@ -1192,7 +1186,6 @@ static inline int pci_msi_enabled(void)
 int pci_get_msi_cap(struct pci_dev *dev);
 int pci_enable_msi_block(struct pci_dev *dev, unsigned int nvec);
-int pci_enable_msi_block_auto(struct pci_dev *dev, unsigned int *maxvec);
 void pci_msi_shutdown(struct pci_dev *dev);
 void pci_disable_msi(struct pci_dev *dev);
 int pci_msix_table_size(struct pci_dev *dev);

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