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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>
This commit is contained in:
Stephen Hemminger 2006-11-08 16:17:15 -08:00 committed by Greg Kroah-Hartman
parent e65e5fb5ce
commit cc692a5f1e
1 changed files with 44 additions and 0 deletions
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44
drivers/pci/pci.c
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@ -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;