> -----Original Message----- > From: Bjorn Helgaas [mailto:bhelgaas@xxxxxxxxxx] > > } > > > > This doesn't make any sense to me. "pos" is the offset of the PCI > Express Capability (identifier 10h). LTR is a separate extended > capability (identifier 18h), so you at least have to look up its > offset. > Sorry paste a wrong patch... How about this patch, not a formal patch. diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 111569c..eced407 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -910,6 +910,45 @@ static void pci_restore_pcie_state(struct pci_dev *dev) pci_write_config_word(dev, pos + PCI_EXP_SLTCTL2, cap[i++]); } +static int pci_save_ltr_value(struct pci_dev *dev) +{ + int i = 0, pos; + struct pci_cap_saved_state *save_state; + u16 *cap; + + pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_LTR); + if (!pos) + return -ENOTSUPP; + + save_state = pci_find_saved_cap(dev, PCI_EXT_CAP_ID_LTR); + if (!save_state) { + dev_err(&dev->dev, "buffer not found in %s\n", __func__); + return -ENOMEM; + } + cap = (u16 *)&save_state->cap.ltr_data[0]; + + pci_read_config_word(dev, pos + PCI_LTR_MAX_SNOOP_LAT, &cap[i++]); + pci_read_config_word(dev, pos + PCI_LTR_MAX_NOSNOOP_LAT, &cap[i++]); +} + +static void pci_restore_ltr_value(struct pci_dev *dev) +{ + int i = 0, pos; + struct pci_cap_saved_state *save_state; + u16 *cap; + + if (!pci_ltr_supported(dev)) + return; + + save_state = pci_find_saved_cap(dev, PCI_EXT_CAP_ID_LTR); + pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_LTR); + if (!save_state || !pos) + return; + cap = (u16 *)&save_state->cap.ltr_data[0]; + + pci_write_config_word(dev, pos + PCI_LTR_MAX_SNOOP_LAT, cap[i++]); + pci_write_config_word(dev, pos + PCI_LTR_MAX_NOSNOOP_LAT, cap[i++]); +} static int pci_save_pcix_state(struct pci_dev *dev) { @@ -964,6 +1003,10 @@ pci_save_state(struct pci_dev *dev) return i; if ((i = pci_save_pcix_state(dev)) != 0) return i; + + if (pci_ltr_supported(dev)) + return pci_save_ltr_value(dev); + return 0; } @@ -1032,6 +1075,7 @@ void pci_restore_state(struct pci_dev *dev) pci_restore_pcix_state(dev); pci_restore_msi_state(dev); pci_restore_iov_state(dev); + pci_restore_ltr_value(dev); dev->state_saved = false; } diff --git a/include/linux/pci.h b/include/linux/pci.h index e444f5b..6343aeb 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -220,6 +220,7 @@ struct pci_cap_saved_data { char cap_nr; unsigned int size; u32 data[0]; + u32 ltr_data[0]; }; struct pci_cap_saved_state { -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
