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pciehp: block new requests from the device before power off 

Disable Bus Master, SERR# and INTx to ensure that no new Requests will
be generated from the device before turning power off, in accordance
with the specification.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Kenji Kaneshige 2007-12-20 19:46:33 +09:00 committed by Greg Kroah-Hartman
parent f1050a35cd
commit 2326e2b999
1 changed files with 21 additions and 12 deletions
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33
drivers/pci/hotplug/pciehp_pci.c
View File

@ -243,9 +243,13 @@ int pciehp_unconfigure_device(struct slot *p_slot)
u8 bctl = 0;
u8 presence = 0;
struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
u16 command;
dbg("%s: bus/dev = %x/%x\n", __FUNCTION__, p_slot->bus,
p_slot->device);
ret = p_slot->hpc_ops->get_adapter_status(p_slot, &presence);
if (ret)
presence = 0;
for (j = 0; j < 8; j++) {
struct pci_dev* temp = pci_get_slot(parent,
@ -258,21 +262,26 @@ int pciehp_unconfigure_device(struct slot *p_slot)
pci_dev_put(temp);
continue;
}
if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
ret = p_slot->hpc_ops->get_adapter_status(p_slot,
&presence);
if (!ret && presence) {
pci_read_config_byte(temp, PCI_BRIDGE_CONTROL,
&bctl);
if (bctl & PCI_BRIDGE_CTL_VGA) {
err("Cannot remove display device %s\n",
pci_name(temp));
pci_dev_put(temp);
continue;
}
if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) {
pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
if (bctl & PCI_BRIDGE_CTL_VGA) {
err("Cannot remove display device %s\n",
pci_name(temp));
pci_dev_put(temp);
continue;
}
}
pci_remove_bus_device(temp);
/*
* Ensure that no new Requests will be generated from
* the device.
*/
if (presence) {
pci_read_config_word(temp, PCI_COMMAND, &command);
command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
command |= PCI_COMMAND_INTX_DISABLE;
pci_write_config_word(temp, PCI_COMMAND, command);
}
pci_dev_put(temp);
}
/*