static int command_write(struct pci_dev *dev, int offset, u16 value, void *data) { struct xen_pcibk_dev_data *dev_data; int err; dev_data = pci_get_drvdata(dev); if (!pci_is_enabled(dev) && is_enable_cmd(value)) { if (unlikely(verbose_request)) printk(KERN_DEBUG DRV_NAME ": %s: enable\n", pci_name(dev)); err = pci_enable_device(dev); if (err) return err; if (dev_data) dev_data->enable_intx = 1; } else if (pci_is_enabled(dev) && !is_enable_cmd(value)) { if (unlikely(verbose_request)) printk(KERN_DEBUG DRV_NAME ": %s: disable\n", pci_name(dev)); pci_disable_device(dev); if (dev_data) dev_data->enable_intx = 0; } if (!dev->is_busmaster && is_master_cmd(value)) { if (unlikely(verbose_request)) printk(KERN_DEBUG DRV_NAME ": %s: set bus master\n", pci_name(dev)); pci_set_master(dev); } if (value & PCI_COMMAND_INVALIDATE) { if (unlikely(verbose_request)) printk(KERN_DEBUG DRV_NAME ": %s: enable memory-write-invalidate\n", pci_name(dev)); err = pci_set_mwi(dev); if (err) { printk(KERN_WARNING DRV_NAME ": %s: cannot enable " "memory-write-invalidate (%d)\n", pci_name(dev), err); value &= ~PCI_COMMAND_INVALIDATE; } } return pci_write_config_word(dev, offset, value); }
static int command_write(struct pci_dev *dev, int offset, u16 value, void *data) { int err; if (!atomic_read(&dev->enable_cnt) && is_enable_cmd(value)) { if (unlikely(verbose_request)) printk(KERN_DEBUG "pciback: %s: enable\n", pci_name(dev)); err = pci_enable_device(dev); if (err) return err; } else if (atomic_read(&dev->enable_cnt) && !is_enable_cmd(value)) { if (unlikely(verbose_request)) printk(KERN_DEBUG "pciback: %s: disable\n", pci_name(dev)); pci_disable_device(dev); } if (!dev->is_busmaster && is_master_cmd(value)) { if (unlikely(verbose_request)) printk(KERN_DEBUG "pciback: %s: set bus master\n", pci_name(dev)); pci_set_master(dev); } if (value & PCI_COMMAND_INVALIDATE) { if (unlikely(verbose_request)) printk(KERN_DEBUG "pciback: %s: enable memory-write-invalidate\n", pci_name(dev)); err = pci_set_mwi(dev); if (err) { printk(KERN_WARNING "pciback: %s: cannot enable memory-write-invalidate (%d)\n", pci_name(dev), err); value &= ~PCI_COMMAND_INVALIDATE; } } return pci_write_config_word(dev, offset, value); }
static int command_write(struct pci_dev *dev, int offset, u16 value, void *data) { struct xen_pcibk_dev_data *dev_data; int err; u16 val; struct pci_cmd_info *cmd = data; dev_data = pci_get_drvdata(dev); if (!pci_is_enabled(dev) && is_enable_cmd(value)) { if (unlikely(verbose_request)) printk(KERN_DEBUG DRV_NAME ": %s: enable\n", pci_name(dev)); err = pci_enable_device(dev); if (err) return err; if (dev_data) dev_data->enable_intx = 1; } else if (pci_is_enabled(dev) && !is_enable_cmd(value)) { if (unlikely(verbose_request)) printk(KERN_DEBUG DRV_NAME ": %s: disable\n", pci_name(dev)); pci_disable_device(dev); if (dev_data) dev_data->enable_intx = 0; } if (!dev->is_busmaster && is_master_cmd(value)) { if (unlikely(verbose_request)) 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 (!(cmd->val & PCI_COMMAND_INVALIDATE) && (value & PCI_COMMAND_INVALIDATE)) { if (unlikely(verbose_request)) printk(KERN_DEBUG DRV_NAME ": %s: enable memory-write-invalidate\n", pci_name(dev)); err = pci_set_mwi(dev); if (err) { pr_warn("%s: cannot enable memory-write-invalidate (%d)\n", 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; if (!permissive && (!dev_data || !dev_data->permissive)) return 0; /* Only allow the guest to control certain bits. */ err = pci_read_config_word(dev, offset, &val); if (err || val == value) return err; value &= PCI_COMMAND_GUEST; value |= val & ~PCI_COMMAND_GUEST; return pci_write_config_word(dev, offset, value); }