> -----Original Message-----
> From: Bjorn Helgaas [mailto:[email protected]]
> > }
> >
>
> 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 {
--
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