Commit 278edfc0 authored by Jan Beulich's avatar Jan Beulich Committed by David Vrabel

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: default avatarJan Beulich <jbeulich@suse.com>
Reviewed-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
parent 85617dc7
...@@ -88,9 +88,15 @@ static int command_write(struct pci_dev *dev, int offset, u16 value, void *data) ...@@ -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", printk(KERN_DEBUG DRV_NAME ": %s: set bus master\n",
pci_name(dev)); pci_name(dev));
pci_set_master(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)) if (unlikely(verbose_request))
printk(KERN_DEBUG printk(KERN_DEBUG
DRV_NAME ": %s: enable memory-write-invalidate\n", 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) ...@@ -101,6 +107,13 @@ static int command_write(struct pci_dev *dev, int offset, u16 value, void *data)
pci_name(dev), err); pci_name(dev), err);
value &= ~PCI_COMMAND_INVALIDATE; 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; cmd->val = value;
......
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