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authorAlexander Gordeev <agordeev@redhat.com>2013-12-30 08:28:15 +0100
committerBjorn Helgaas <bhelgaas@google.com>2014-01-03 17:17:55 -0700
commitff1aa430a2fa43189e89c7ddd559f0bee2298288 (patch)
tree731237d3f796f92aa31b41a8fda7f0e38c707fbb /drivers/pci/msi.c
parent7b92b4f61ec49cb1a5813298f35258bd7ecd3667 (diff)
downloadlinux-ff1aa430a2fa43189e89c7ddd559f0bee2298288.tar.bz2
PCI/MSI: Add pci_msix_vec_count()
This creates an MSI-X counterpart for pci_msi_vec_count(). Device drivers can use this function to obtain maximum number of MSI-X interrupts the device supports and use that number in a subsequent call to pci_enable_msix(). pci_msix_vec_count() supersedes pci_msix_table_size() and returns a negative errno if device does not support MSI-X interrupts. After this update, callers must always check the returned value. The only user of pci_msix_table_size() was the PCI-Express port driver, which is also updated by this change. Signed-off-by: Alexander Gordeev <agordeev@redhat.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'drivers/pci/msi.c')
-rw-r--r--drivers/pci/msi.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 76507ab13beb..bd18ecf74c55 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -948,19 +948,25 @@ void pci_disable_msi(struct pci_dev *dev)
EXPORT_SYMBOL(pci_disable_msi);
/**
- * pci_msix_table_size - return the number of device's MSI-X table entries
+ * pci_msix_vec_count - return the number of device's MSI-X table entries
* @dev: pointer to the pci_dev data structure of MSI-X device function
- */
-int pci_msix_table_size(struct pci_dev *dev)
+
+ * This function returns the number of device's MSI-X table entries and
+ * therefore the number of MSI-X vectors device is capable of sending.
+ * It returns a negative errno if the device is not capable of sending MSI-X
+ * interrupts.
+ **/
+int pci_msix_vec_count(struct pci_dev *dev)
{
u16 control;
if (!dev->msix_cap)
- return 0;
+ return -EINVAL;
pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control);
return msix_table_size(control);
}
+EXPORT_SYMBOL(pci_msix_vec_count);
/**
* pci_enable_msix - configure device's MSI-X capability structure
@@ -989,7 +995,9 @@ int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec)
if (status)
return status;
- nr_entries = pci_msix_table_size(dev);
+ nr_entries = pci_msix_vec_count(dev);
+ if (nr_entries < 0)
+ return nr_entries;
if (nvec > nr_entries)
return nr_entries;