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PCI MSI: Add support for multiple MSI

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Add the new API pci_enable_msi_block() to allow drivers to
request multiple MSI and reimplement pci_enable_msi in terms of
pci_enable_msi_block.  Ensure that the architecture back ends don't
have to know about multiple MSI.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Matthew Wilcox
2009-03-17 08:54:10 -04:00
committed by Jesse Barnes
parent f2440d9acb
commit 1c8d7b0a56
7 changed files with 116 additions and 41 deletions
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6
include/linux/pci.h
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@@ -789,7 +789,7 @@ struct msix_entry {
#ifndef CONFIG_PCI_MSI
static inline int pci_enable_msi(struct pci_dev *dev)
static inline int pci_enable_msi_block(struct pci_dev *dev, unsigned int nvec)
{
return -1;
}
@@ -824,7 +824,7 @@ static inline int pci_msi_enabled(void)
return 0;
}
#else
extern int pci_enable_msi(struct pci_dev *dev);
extern int pci_enable_msi_block(struct pci_dev *dev, unsigned int nvec);
extern void pci_msi_shutdown(struct pci_dev *dev);
extern void pci_disable_msi(struct pci_dev *dev);
extern int pci_msix_table_size(struct pci_dev *dev);
@@ -846,6 +846,8 @@ static inline int pcie_aspm_enabled(void)
extern int pcie_aspm_enabled(void);
#endif
#define pci_enable_msi(pdev) pci_enable_msi_block(pdev, 1)
#ifdef CONFIG_HT_IRQ
/* The functions a driver should call */
int ht_create_irq(struct pci_dev *dev, int idx);