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authorJesse Barnes <jbarnes@virtuousgeek.org>2010-10-19 22:07:57 +0200
committerJesse Barnes <jbarnes@virtuousgeek.org>2011-05-12 00:18:40 +0200
commitb48d4425b602f5f4978299474743dbea130d940d (patch)
tree7da23c264cab62bce753e60c4e8d5fbbb0aab0e7 /drivers/pci/pci.c
parentPCI hotplug: acpiphp: assume device is in state D0 after powering on a slot. (diff)
downloadlinux-b48d4425b602f5f4978299474743dbea130d940d.tar.xz
linux-b48d4425b602f5f4978299474743dbea130d940d.zip
PCI: add ID-based ordering enable/disable support
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>
Diffstat (limited to 'drivers/pci/pci.c')
-rw-r--r--drivers/pci/pci.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 44d1c7c3876b..d0182bed7acc 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1834,6 +1834,59 @@ void pci_enable_ari(struct pci_dev *dev)
bridge->ari_enabled = 1;
}
+/**
+ * pci_enable_ido - enable ID-based ordering on a device
+ * @dev: the PCI device
+ * @type: which types of IDO to enable
+ *
+ * Enable ID-based ordering on @dev. @type can contain the bits
+ * %PCI_EXP_IDO_REQUEST and/or %PCI_EXP_IDO_COMPLETION to indicate
+ * which types of transactions are allowed to be re-ordered.
+ */
+void pci_enable_ido(struct pci_dev *dev, unsigned long type)
+{
+ int pos;
+ u16 ctrl;
+
+ pos = pci_pcie_cap(dev);
+ if (!pos)
+ return;
+
+ pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &ctrl);
+ if (type & PCI_EXP_IDO_REQUEST)
+ ctrl |= PCI_EXP_IDO_REQ_EN;
+ if (type & PCI_EXP_IDO_COMPLETION)
+ ctrl |= PCI_EXP_IDO_CMP_EN;
+ pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl);
+}
+EXPORT_SYMBOL(pci_enable_ido);
+
+/**
+ * pci_disable_ido - disable ID-based ordering on a device
+ * @dev: the PCI device
+ * @type: which types of IDO to disable
+ */
+void pci_disable_ido(struct pci_dev *dev, unsigned long type)
+{
+ int pos;
+ u16 ctrl;
+
+ if (!pci_is_pcie(dev))
+ return;
+
+ pos = pci_pcie_cap(dev);
+ if (!pos)
+ return;
+
+ pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &ctrl);
+ if (type & PCI_EXP_IDO_REQUEST)
+ ctrl &= ~PCI_EXP_IDO_REQ_EN;
+ if (type & PCI_EXP_IDO_COMPLETION)
+ ctrl &= ~PCI_EXP_IDO_CMP_EN;
+ pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, ctrl);
+}
+EXPORT_SYMBOL(pci_disable_ido);
+
static int pci_acs_enable;
/**