summaryrefslogtreecommitdiffstats
path: root/drivers/pci/msi.c
diff options
context:
space:
mode:
authorAlexander Gordeev <agordeev@redhat.com>2013-12-30 08:28:13 +0100
committerBjorn Helgaas <bhelgaas@google.com>2014-01-03 17:17:55 -0700
commitd1ac1d2622e8f0fd2a25127a8649d135b54db8a9 (patch)
tree9b267fa3c5d97fc9c6c65877a9d493d407258abe /drivers/pci/msi.c
parent52179dc9edc3b7a2b3bb01cbb1b6c96f6d05fc73 (diff)
downloadlinux-d1ac1d2622e8f0fd2a25127a8649d135b54db8a9.tar.bz2
PCI/MSI: Add pci_msi_vec_count()
Device drivers can use this interface to obtain the maximum number of MSI interrupts the device supports and use that number, e.g., in a subsequent call to pci_enable_msi_block(). 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.c41
1 files changed, 33 insertions, 8 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index ce0d4eb91a22..ba6d0a9bdd39 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -843,6 +843,31 @@ static int pci_msi_check_device(struct pci_dev *dev, int nvec, int type)
}
/**
+ * pci_msi_vec_count - Return the number of MSI vectors a device can send
+ * @dev: device to report about
+ *
+ * This function returns the number of MSI vectors a device requested via
+ * Multiple Message Capable register. It returns a negative errno if the
+ * device is not capable sending MSI interrupts. Otherwise, the call succeeds
+ * and returns a power of two, up to a maximum of 2^5 (32), according to the
+ * MSI specification.
+ **/
+int pci_msi_vec_count(struct pci_dev *dev)
+{
+ int ret;
+ u16 msgctl;
+
+ if (!dev->msi_cap)
+ return -EINVAL;
+
+ pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &msgctl);
+ ret = 1 << ((msgctl & PCI_MSI_FLAGS_QMASK) >> 1);
+
+ return ret;
+}
+EXPORT_SYMBOL(pci_msi_vec_count);
+
+/**
* pci_enable_msi_block - configure device's MSI capability structure
* @dev: device to configure
* @nvec: number of interrupts to configure
@@ -858,13 +883,13 @@ static int pci_msi_check_device(struct pci_dev *dev, int nvec, int type)
int pci_enable_msi_block(struct pci_dev *dev, int nvec)
{
int status, maxvec;
- u16 msgctl;
- if (!dev->msi_cap || dev->current_state != PCI_D0)
+ if (dev->current_state != PCI_D0)
return -EINVAL;
- pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &msgctl);
- maxvec = 1 << ((msgctl & PCI_MSI_FLAGS_QMASK) >> 1);
+ maxvec = pci_msi_vec_count(dev);
+ if (maxvec < 0)
+ return maxvec;
if (nvec > maxvec)
return maxvec;
@@ -889,13 +914,13 @@ EXPORT_SYMBOL(pci_enable_msi_block);
int pci_enable_msi_block_auto(struct pci_dev *dev, int *maxvec)
{
int ret, nvec;
- u16 msgctl;
- if (!dev->msi_cap || dev->current_state != PCI_D0)
+ if (dev->current_state != PCI_D0)
return -EINVAL;
- pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &msgctl);
- ret = 1 << ((msgctl & PCI_MSI_FLAGS_QMASK) >> 1);
+ ret = pci_msi_vec_count(dev);
+ if (ret < 0)
+ return ret;
if (maxvec)
*maxvec = ret;