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);
}
Example #2
0
/* Ensure a device is "turned off" and ready to be exported.
 * (Also see xen_pcibk_config_reset to ensure virtual configuration space is
 * ready to be re-exported)
 */
void xen_pcibk_reset_device(struct pci_dev *dev)
{
	u16 cmd;

	xen_pcibk_control_isr(dev, 1 /* reset device */);

	/* Disable devices (but not bridges) */
	if (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) {
#ifdef CONFIG_PCI_MSI
		/* The guest could have been abruptly killed without
		 * disabling MSI/MSI-X interrupts.*/
		if (dev->msix_enabled)
			pci_disable_msix(dev);
		if (dev->msi_enabled)
			pci_disable_msi(dev);
#endif
		if (pci_is_enabled(dev))
			pci_disable_device(dev);

		pci_write_config_word(dev, PCI_COMMAND, 0);

		dev->is_busmaster = 0;
	} else {
		pci_read_config_word(dev, PCI_COMMAND, &cmd);
		if (cmd & (PCI_COMMAND_INVALIDATE)) {
			cmd &= ~(PCI_COMMAND_INVALIDATE);
			pci_write_config_word(dev, PCI_COMMAND, cmd);

			dev->is_busmaster = 0;
		}
	}
}
Example #3
0
struct usnic_vnic *usnic_vnic_alloc(struct pci_dev *pdev)
{
	struct usnic_vnic *vnic;
	int err = 0;

	if (!pci_is_enabled(pdev)) {
		usnic_err("PCI dev %s is disabled\n", pci_name(pdev));
		return ERR_PTR(-EINVAL);
	}

	vnic = kzalloc(sizeof(*vnic), GFP_KERNEL);
	if (!vnic) {
		usnic_err("Failed to alloc vnic for %s - out of memory\n",
				pci_name(pdev));
		return ERR_PTR(-ENOMEM);
	}

	spin_lock_init(&vnic->res_lock);

	err = usnic_vnic_discover_resources(pdev, vnic);
	if (err) {
		usnic_err("Failed to discover %s resources with err %d\n",
				pci_name(pdev), err);
		goto out_free_vnic;
	}

	usnic_dbg("Allocated vnic for %s\n", usnic_vnic_pci_name(vnic));

	return vnic;

out_free_vnic:
	kfree(vnic);

	return ERR_PTR(err);
}
Example #4
0
File: ltp_tpci.c Project: 1587/ltp
static int pci_disable(void)
{
	struct pci_dev *dev = ltp_pci.dev;

	prk_info("disable pci device");

	/* check if device pointer exists */
	if (!dev) {
		prk_err("dev is NULL");
		return TFAIL;
	}

	prk_info("is pci enabled '%d', is managed '%d'",
		pci_is_enabled(dev), pci_is_managed(dev));

	pci_release_regions(dev);
	pci_disable_device(dev);

	if (dev->current_state == PCI_D3hot ||
		dev->current_state == PCI_D3cold) {

		prk_info("disabled pci device, state '%s'",
			pci_power_name(dev->current_state));
		return TPASS;

	}

	prk_err("failed to disable pci device, state '%s'",
		pci_power_name(dev->current_state));
	return TFAIL;
}
static int command_read(struct pci_dev *dev, int offset, u16 *value, void *data)
{
	int i;
	int ret;

	ret = xen_pcibk_read_config_word(dev, offset, value, data);
	if (!pci_is_enabled(dev))
		return ret;

	for (i = 0; i < PCI_ROM_RESOURCE; i++) {
		if (dev->resource[i].flags & IORESOURCE_IO)
			*value |= PCI_COMMAND_IO;
		if (dev->resource[i].flags & IORESOURCE_MEM)
			*value |= PCI_COMMAND_MEMORY;
	}

	return ret;
}
Example #6
0
/* Ensure a device is has the fake IRQ handler "turned on/off" and is
 * ready to be exported. This MUST be run after xen_pcibk_reset_device
 * which does the actual PCI device enable/disable.
 */
static void xen_pcibk_control_isr(struct pci_dev *dev, int reset)
{
	struct xen_pcibk_dev_data *dev_data;
	int rc;
	int enable = 0;

	dev_data = pci_get_drvdata(dev);
	if (!dev_data)
		return;

	/* We don't deal with bridges */
	if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL)
		return;

	if (reset) {
		dev_data->enable_intx = 0;
		dev_data->ack_intr = 0;
	}
	enable =  dev_data->enable_intx;

	/* Asked to disable, but ISR isn't runnig */
	if (!enable && !dev_data->isr_on)
		return;

	/* Squirrel away the IRQs in the dev_data. We need this
	 * b/c when device transitions to MSI, the dev->irq is
	 * overwritten with the MSI vector.
	 */
	if (enable)
		dev_data->irq = dev->irq;

	/*
	 * SR-IOV devices in all use MSI-X and have no legacy
	 * interrupts, so inhibit creating a fake IRQ handler for them.
	 */
	if (dev_data->irq == 0)
		goto out;

	dev_dbg(&dev->dev, "%s: #%d %s %s%s %s-> %s\n",
		dev_data->irq_name,
		dev_data->irq,
		pci_is_enabled(dev) ? "on" : "off",
		dev->msi_enabled ? "MSI" : "",
		dev->msix_enabled ? "MSI/X" : "",
		dev_data->isr_on ? "enable" : "disable",
		enable ? "enable" : "disable");

	if (enable) {
		/*
		 * The MSI or MSI-X should not have an IRQ handler. Otherwise
		 * if the guest terminates we BUG_ON in free_msi_irqs.
		 */
		if (dev->msi_enabled || dev->msix_enabled)
			goto out;

		rc = request_irq(dev_data->irq,
				xen_pcibk_guest_interrupt, IRQF_SHARED,
				dev_data->irq_name, dev);
		if (rc) {
			dev_err(&dev->dev, "%s: failed to install fake IRQ " \
				"handler for IRQ %d! (rc:%d)\n",
				dev_data->irq_name, dev_data->irq, rc);
			goto out;
		}
	} else {
		free_irq(dev_data->irq, dev);
		dev_data->irq = 0;
	}
	dev_data->isr_on = enable;
	dev_data->ack_intr = enable;
out:
	dev_dbg(&dev->dev, "%s: #%d %s %s%s %s\n",
		dev_data->irq_name,
		dev_data->irq,
		pci_is_enabled(dev) ? "on" : "off",
		dev->msi_enabled ? "MSI" : "",
		dev->msix_enabled ? "MSI/X" : "",
		enable ? (dev_data->isr_on ? "enabled" : "failed to enable") :
			(dev_data->isr_on ? "failed to disable" : "disabled"));
}
Example #7
0
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);
}