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xen/x86/PCI: Add support for the Xen PCI subsystem

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The frontend stub lives in arch/x86/pci/xen.c, alongside other
sub-arch PCI init code (e.g. olpc.c).

It provides a mechanism for Xen PCI frontend to setup/destroy
legacy interrupts, MSI/MSI-X, and PCI configuration operations.

[ Impact: add core of Xen PCI support ]
[ v2: Removed the IOMMU code and only focusing on PCI.]
[ v3: removed usage of pci_scan_all_fns as that does not exist]
[ v4: introduced pci_xen value to fix compile warnings]
[ v5: squished fixes+features in one patch, changed Reviewed-by to Ccs]
[ v7: added Acked-by]
Signed-off-by: Alex Nixon <alex.nixon@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: Qing He <qing.he@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86@kernel.org
This commit is contained in:
Alex Nixon
2010-03-18 16:31:34 -04:00
committed by Konrad Rzeszutek Wilk
parent 294ee6f89c
commit b5401a96b5
7 changed files with 242 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

53
arch/x86/include/asm/xen/pci.h Normal file
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#ifndef _ASM_X86_XEN_PCI_H
#define _ASM_X86_XEN_PCI_H
#if defined(CONFIG_PCI_XEN)
extern int __init pci_xen_init(void);
#define pci_xen 1
#else
#define pci_xen 0
#define pci_xen_init (0)
#endif
#if defined(CONFIG_PCI_MSI)
#if defined(CONFIG_PCI_XEN)
/* The drivers/pci/xen-pcifront.c sets this structure to
* its own functions.
*/
struct xen_pci_frontend_ops {
int (*enable_msi)(struct pci_dev *dev, int **vectors);
void (*disable_msi)(struct pci_dev *dev);
int (*enable_msix)(struct pci_dev *dev, int **vectors, int nvec);
void (*disable_msix)(struct pci_dev *dev);
};
extern struct xen_pci_frontend_ops *xen_pci_frontend;
static inline int xen_pci_frontend_enable_msi(struct pci_dev *dev,
int **vectors)
{
if (xen_pci_frontend && xen_pci_frontend->enable_msi)
return xen_pci_frontend->enable_msi(dev, vectors);
return -ENODEV;
}
static inline void xen_pci_frontend_disable_msi(struct pci_dev *dev)
{
if (xen_pci_frontend && xen_pci_frontend->disable_msi)
xen_pci_frontend->disable_msi(dev);
}
static inline int xen_pci_frontend_enable_msix(struct pci_dev *dev,
int **vectors, int nvec)
{
if (xen_pci_frontend && xen_pci_frontend->enable_msix)
return xen_pci_frontend->enable_msix(dev, vectors, nvec);
return -ENODEV;
}
static inline void xen_pci_frontend_disable_msix(struct pci_dev *dev)
{
if (xen_pci_frontend && xen_pci_frontend->disable_msix)
xen_pci_frontend->disable_msix(dev);
}
#endif /* CONFIG_PCI_XEN */
#endif /* CONFIG_PCI_MSI */
#endif /* _ASM_X86_XEN_PCI_H */