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PCI: add ID-based ordering enable/disable support

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Add support to allow drivers to enable/disable ID-based ordering.  Where
supported, ID-based ordering can significantly improve the latency of
individual requests by preventing them from queueing up behind unrelated
traffic.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Jesse Barnes
2010-10-19 13:07:57 -07:00
parent 69643e4829
commit b48d4425b6
3 changed files with 68 additions and 0 deletions
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13
include/linux/pci.h
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@@ -828,6 +828,11 @@ static inline int pci_enable_wake(struct pci_dev *dev, pci_power_t state,
return __pci_enable_wake(dev, state, false, enable);
}
#define PCI_EXP_IDO_REQUEST (1<<0)
#define PCI_EXP_IDO_COMPLETION (1<<1)
void pci_enable_ido(struct pci_dev *dev, unsigned long type);
void pci_disable_ido(struct pci_dev *dev, unsigned long type);
/* For use by arch with custom probe code */
void set_pcie_port_type(struct pci_dev *pdev);
void set_pcie_hotplug_bridge(struct pci_dev *pdev);
@@ -1207,6 +1212,14 @@ static inline int pci_enable_wake(struct pci_dev *dev, pci_power_t state,
return 0;
}
static inline void pci_enable_ido(struct pci_dev *dev, unsigned long type)
{
}
static inline void pci_disable_ido(struct pci_dev *dev, unsigned long type)
{
}
static inline int pci_request_regions(struct pci_dev *dev, const char *res_name)
{
return -EIO;