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x86: Introduce x86_msi_ops

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Introduce an x86 specific indirect mechanism to setup MSIs.
The MSI setup functions become function pointers in an x86_msi_ops
struct, that defaults to the implementation in io_apic.c and msi.c.

[v2: Use HAVE_DEFAULT_* knobs]
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Stefano Stabellini
2010-10-06 16:12:28 -04:00
committed by Konrad Rzeszutek Wilk
parent 1525bf0d8f
commit 294ee6f89c
4 changed files with 49 additions and 4 deletions
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33
arch/x86/include/asm/pci.h
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@@ -7,6 +7,7 @@
#include <linux/string.h>
#include <asm/scatterlist.h>
#include <asm/io.h>
#include <asm/x86_init.h>
#ifdef __KERNEL__
@@ -94,8 +95,36 @@ static inline void early_quirks(void) { }
extern void pci_iommu_alloc(void);
/* MSI arch hook */
#define arch_setup_msi_irqs arch_setup_msi_irqs
#ifdef CONFIG_PCI_MSI
/* MSI arch specific hooks */
static inline int x86_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
return x86_msi.setup_msi_irqs(dev, nvec, type);
}
static inline void x86_teardown_msi_irqs(struct pci_dev *dev)
{
x86_msi.teardown_msi_irqs(dev);
}
static inline void x86_teardown_msi_irq(unsigned int irq)
{
x86_msi.teardown_msi_irq(irq);
}
#define arch_setup_msi_irqs x86_setup_msi_irqs
#define arch_teardown_msi_irqs x86_teardown_msi_irqs
#define arch_teardown_msi_irq x86_teardown_msi_irq
/* implemented in arch/x86/kernel/apic/io_apic. */
int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
void native_teardown_msi_irq(unsigned int irq);
/* default to the implementation in drivers/lib/msi.c */
#define HAVE_DEFAULT_MSI_TEARDOWN_IRQS
void default_teardown_msi_irqs(struct pci_dev *dev);
#else
#define native_setup_msi_irqs NULL
#define native_teardown_msi_irq NULL
#define default_teardown_msi_irqs NULL
#endif
#define PCI_DMA_BUS_IS_PHYS (dma_ops->is_phys)