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PCI: support PCIe ARI capability

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This patch adds support for PCI Express Alternative Routing-ID
Interpretation (ARI) capability.

The ARI capability extends the Function Number field of the PCI Express
Endpoint by reusing the Device Number which is otherwise hardwired to 0.
With ARI, an Endpoint can have up to 256 functions.

Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Yu Zhao 2008-10-14 14:02:53 +08:00 • committed by Jesse Barnes
parent 201de56eb2
commit 58c3a727cb
5 changed files with 62 additions and 0 deletions
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32
drivers/pci/pci.c
View file

@ -1299,6 +1299,38 @@ void pci_pm_init(struct pci_dev *dev)
}
}
/**
* pci_enable_ari - enable ARI forwarding if hardware support it
* @dev: the PCI device
*/
void pci_enable_ari(struct pci_dev *dev)
{
int pos;
u32 cap;
u16 ctrl;
if (!dev->is_pcie)
return;
if (dev->pcie_type != PCI_EXP_TYPE_ROOT_PORT &&
dev->pcie_type != PCI_EXP_TYPE_DOWNSTREAM)
return;
pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
if (!pos)
return;
pci_read_config_dword(dev, pos + PCI_EXP_DEVCAP2, &cap);
if (!(cap & PCI_EXP_DEVCAP2_ARI))
return;
pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &ctrl);
ctrl |= PCI_EXP_DEVCTL2_ARI;
pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl);
dev->ari_enabled = 1;
}
int
pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge)
{