Enable LTR(Latency tolerance reporting) in pci_enable_device(), make sure this feature is enabled before the device is used by driver.
Signed-off-by: Xudong Hao <[email protected]> --- drivers/pci/pci.c | 19 +++++++++++++++++++ 1 files changed, 19 insertions(+), 0 deletions(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index a70093b..5e5e3ad 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1136,6 +1136,21 @@ int pci_load_and_free_saved_state(struct pci_dev *dev, } EXPORT_SYMBOL_GPL(pci_load_and_free_saved_state); +static void pci_enable_dev_caps(struct pci_dev *dev) +{ + /* + * LTR(Latency tolerance reporting) allows devices to send + * messages to the root complex indicating their latency + * tolerance for snooped & unsnooped memory transactions. + */ + pci_enable_ltr(dev); +} + +static void pci_disable_dev_caps(struct pci_dev *dev) +{ + pci_disable_ltr(dev); +} + static int do_pci_enable_device(struct pci_dev *dev, int bars) { int err; @@ -1148,6 +1163,9 @@ static int do_pci_enable_device(struct pci_dev *dev, int bars) return err; pci_fixup_device(pci_fixup_enable, dev); + /* Enable some device capibility before it's used by driver. */ + pci_enable_dev_caps(dev); + return 0; } @@ -1363,6 +1381,7 @@ static void do_pci_disable_device(struct pci_dev *dev) } pcibios_disable_device(dev); + pci_disable_dev_caps(dev); } /** -- 1.5.5 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
