GitHub-Mirror/linux-bl808
2
0
Fork 0
mirror of https://github.com/Fishwaldo/linux-bl808.git synced 2025-06-17 20:25:19 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

PCI/MSI: Add pci_enable_msi_exact() and pci_enable_msix_exact()

Browse source 
The new functions are special cases for pci_enable_msi_range() and
pci_enable_msix_range() when a particular number of MSI or MSI-X
is needed.

By contrast with pci_enable_msi_range() and pci_enable_msix_range()
functions, pci_enable_msi_exact() and pci_enable_msix_exact()
return zero in case of success, which indicates MSI or MSI-X
interrupts have been successfully allocated.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Alexander Gordeev 2014-02-13 15:25:02 +01:00 • committed by Bjorn Helgaas
parent fef07277f8
commit f7fc32cb20
2 changed files with 104 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

20
include/linux/pci.h
View file

@ -1169,8 +1169,23 @@ void msi_remove_pci_irq_vectors(struct pci_dev *dev);
void pci_restore_msi_state(struct pci_dev *dev);
int pci_msi_enabled(void);
int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec);
static inline int pci_enable_msi_exact(struct pci_dev *dev, int nvec)
{
int rc = pci_enable_msi_range(dev, nvec, nvec);
if (rc < 0)
return rc;
return 0;
}
int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
int minvec, int maxvec);
static inline int pci_enable_msix_exact(struct pci_dev *dev,
struct msix_entry *entries, int nvec)
{
int rc = pci_enable_msix_range(dev, entries, nvec, nvec);
if (rc < 0)
return rc;
return 0;
}
#else
static inline int pci_msi_vec_count(struct pci_dev *dev) { return -ENOSYS; }
static inline int pci_enable_msi_block(struct pci_dev *dev, int nvec)
@ -1189,9 +1204,14 @@ static inline int pci_msi_enabled(void) { return 0; }
static inline int pci_enable_msi_range(struct pci_dev *dev, int minvec,
int maxvec)
{ return -ENOSYS; }
static inline int pci_enable_msi_exact(struct pci_dev *dev, int nvec)
{ return -ENOSYS; }
static inline int pci_enable_msix_range(struct pci_dev *dev,
struct msix_entry *entries, int minvec, int maxvec)
{ return -ENOSYS; }
static inline int pci_enable_msix_exact(struct pci_dev *dev,
struct msix_entry *entries, int nvec)
{ return -ENOSYS; }
#endif
#ifdef CONFIG_PCIEPORTBUS