PCI: save/restore PCI-X state

Shouldn't PCI-X state be saved/restored?  No device really needs this
right now. qla24xx (fc HBA) and mthca (infiniband) don't do suspend, 
and sky2 resets its tweaks when links are brought up.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 44 insertions, 0 deletions

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index a544997399b3..0eaf381ae93e 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -490,6 +490,47 @@ static void pci_restore_pcie_state(struct pci_dev *dev)
         kfree(save_state);
 }
 
+
+static int pci_save_pcix_state(struct pci_dev *dev)
+{
+        int pos, i = 0;
+        struct pci_cap_saved_state *save_state;
+        u16 *cap;
+
+        pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
+        if (pos <= 0)
+                return 0;
+
+        save_state = kzalloc(sizeof(*save_state) + sizeof(u16), GFP_KERNEL);
+        if (!save_state) {
+                dev_err(&dev->dev, "Out of memory in pci_save_pcie_state\n");
+                return -ENOMEM;
+        }
+        cap = (u16 *)&save_state->data[0];
+
+        pci_read_config_word(dev, pos + PCI_X_CMD, &cap[i++]);
+        pci_add_saved_cap(dev, save_state);
+        return 0;
+}
+
+static void pci_restore_pcix_state(struct pci_dev *dev)
+{
+        int i = 0, pos;
+        struct pci_cap_saved_state *save_state;
+        u16 *cap;
+
+        save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX);
+        pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
+        if (!save_state || pos <= 0)
+                return;
+        cap = (u16 *)&save_state->data[0];
+
+        pci_write_config_word(dev, pos + PCI_X_CMD, cap[i++]);
+        pci_remove_saved_cap(save_state);
+        kfree(save_state);
+}
+
+
 /**
  * pci_save_state - save the PCI configuration space of a device before suspending
  * @dev: - PCI device that we're dealing with
@@ -507,6 +548,8 @@ pci_save_state(struct pci_dev *dev)
                 return i;
         if ((i = pci_save_pcie_state(dev)) != 0)
                 return i;
+        if ((i = pci_save_pcix_state(dev)) != 0)
+                return i;
         return 0;
 }
 
@@ -538,6 +581,7 @@ pci_restore_state(struct pci_dev *dev)
                                 dev->saved_config_space[i]);
                 }
         }
+        pci_restore_pcix_state(dev);
         pci_restore_msi_state(dev);
         pci_restore_msix_state(dev);
         return 0;