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xen-pciback: also support disabling of bus-mastering and memory-write-invalidate 

It's not clear to me why only the enabling operation got handled so
far.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Jan Beulich 2015-03-11 13:52:00 +00:00 committed by David Vrabel
parent 85617dc7ee
commit 278edfc078
1 changed files with 14 additions and 1 deletions
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15
drivers/xen/xen-pciback/conf_space_header.c
View File

@ -88,9 +88,15 @@ static int command_write(struct pci_dev *dev, int offset, u16 value, void *data)
printk(KERN_DEBUG DRV_NAME ": %s: set bus master\n",
pci_name(dev));
pci_set_master(dev);
} else if (dev->is_busmaster && !is_master_cmd(value)) {
if (unlikely(verbose_request))
printk(KERN_DEBUG DRV_NAME ": %s: clear bus master\n",
pci_name(dev));
pci_clear_master(dev);
}
if (value & PCI_COMMAND_INVALIDATE) {
if (!(cmd->val & PCI_COMMAND_INVALIDATE) &&
(value & PCI_COMMAND_INVALIDATE)) {
if (unlikely(verbose_request))
printk(KERN_DEBUG
DRV_NAME ": %s: enable memory-write-invalidate\n",
@ -101,6 +107,13 @@ static int command_write(struct pci_dev *dev, int offset, u16 value, void *data)
pci_name(dev), err);
value &= ~PCI_COMMAND_INVALIDATE;
}
} else if ((cmd->val & PCI_COMMAND_INVALIDATE) &&
!(value & PCI_COMMAND_INVALIDATE)) {
if (unlikely(verbose_request))
printk(KERN_DEBUG
DRV_NAME ": %s: disable memory-write-invalidate\n",
pci_name(dev));
pci_clear_mwi(dev);
}
cmd->val = value;