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@@ -1834,6 +1834,59 @@ void pci_enable_ari(struct pci_dev *dev)
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bridge->ari_enabled = 1;
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}
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+/**
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+ * pci_enable_ido - enable ID-based ordering on a device
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+ * @dev: the PCI device
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+ * @type: which types of IDO to enable
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+ *
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+ * Enable ID-based ordering on @dev. @type can contain the bits
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+ * %PCI_EXP_IDO_REQUEST and/or %PCI_EXP_IDO_COMPLETION to indicate
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+ * which types of transactions are allowed to be re-ordered.
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+ */
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+void pci_enable_ido(struct pci_dev *dev, unsigned long type)
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+{
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+ int pos;
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+ u16 ctrl;
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+
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+ pos = pci_pcie_cap(dev);
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+ if (!pos)
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+ return;
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+
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+ pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &ctrl);
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+ if (type & PCI_EXP_IDO_REQUEST)
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+ ctrl |= PCI_EXP_IDO_REQ_EN;
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+ if (type & PCI_EXP_IDO_COMPLETION)
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+ ctrl |= PCI_EXP_IDO_CMP_EN;
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+ pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl);
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+}
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+EXPORT_SYMBOL(pci_enable_ido);
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+
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+/**
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+ * pci_disable_ido - disable ID-based ordering on a device
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+ * @dev: the PCI device
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+ * @type: which types of IDO to disable
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+ */
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+void pci_disable_ido(struct pci_dev *dev, unsigned long type)
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+{
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+ int pos;
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+ u16 ctrl;
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+
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+ if (!pci_is_pcie(dev))
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+ return;
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+
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+ pos = pci_pcie_cap(dev);
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+ if (!pos)
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+ return;
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+
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+ pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &ctrl);
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+ if (type & PCI_EXP_IDO_REQUEST)
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+ ctrl &= ~PCI_EXP_IDO_REQ_EN;
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+ if (type & PCI_EXP_IDO_COMPLETION)
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+ ctrl &= ~PCI_EXP_IDO_CMP_EN;
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+ pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl);
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+}
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+EXPORT_SYMBOL(pci_disable_ido);
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+
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static int pci_acs_enable;
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/**
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