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authorAlexander Gordeev <agordeev@redhat.com>2014-01-17 10:26:20 +0100
committerBjorn Helgaas <bhelgaas@google.com>2014-02-03 22:08:49 -0800
commit9a8b0af9b1dacf1d865d4b8bff7360e5b318481a (patch)
treec9bd078e3860228d1271b89f59af306f229a85e2 /Documentation/PCI
parent39af663b5fd25c9dd427e12e106763b6b4f9572c (diff)
PCI/MSI: Add pci_enable_msi() documentation back
We deprecated pci_enable_msi() in 302a2523c277 ("PCI/MSI: Add pci_enable_msi_range() and pci_enable_msix_range()"). But we changed our minds after noticing that: - pci_enable_msi() doesn't have confusing return values like pci_enable_msi_block() and pci_enable_msix() did, and - pci_enable_msi() has a hundred or so callers that we don't want to change. This adds back the pci_enable_msi() documentation. [bhelgaas: changelog] Signed-off-by: Alexander Gordeev <agordeev@redhat.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'Documentation/PCI')
-rw-r--r--Documentation/PCI/MSI-HOWTO.txt23
1 files changed, 20 insertions, 3 deletions
diff --git a/Documentation/PCI/MSI-HOWTO.txt b/Documentation/PCI/MSI-HOWTO.txt
index a8d01005f480..3c3080e9afef 100644
--- a/Documentation/PCI/MSI-HOWTO.txt
+++ b/Documentation/PCI/MSI-HOWTO.txt
@@ -82,7 +82,19 @@ Most of the hard work is done for the driver in the PCI layer. It simply
has to request that the PCI layer set up the MSI capability for this
device.
-4.2.1 pci_enable_msi_range
+4.2.1 pci_enable_msi
+
+int pci_enable_msi(struct pci_dev *dev)
+
+A successful call allocates ONE interrupt to the device, regardless
+of how many MSIs the device supports. The device is switched from
+pin-based interrupt mode to MSI mode. The dev->irq number is changed
+to a new number which represents the message signaled interrupt;
+consequently, this function should be called before the driver calls
+request_irq(), because an MSI is delivered via a vector that is
+different from the vector of a pin-based interrupt.
+
+4.2.2 pci_enable_msi_range
int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec)
@@ -158,7 +170,12 @@ static int foo_driver_enable_single_msi(struct pci_dev *pdev)
return pci_enable_msi_range(pdev, 1, 1);
}
-4.2.2 pci_disable_msi
+Note, unlike pci_enable_msi() function, which could be also used to
+enable the single MSI mode, pci_enable_msi_range() returns either a
+negative errno or 1 (not negative errno or 0 - as pci_enable_msi()
+does).
+
+4.2.3 pci_disable_msi
void pci_disable_msi(struct pci_dev *dev)
@@ -172,7 +189,7 @@ 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.
-4.2.3 pci_msi_vec_count
+4.2.4 pci_msi_vec_count
int pci_msi_vec_count(struct pci_dev *dev)

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