[mirror_ubuntu-artful-kernel.git] / drivers / virtio / virtio_pci.c

/*
 * Virtio PCI driver
 *
 * This module allows virtio devices to be used over a virtual PCI device.
 * This can be used with QEMU based VMMs like KVM or Xen.
 *
 * Copyright IBM Corp. 2007
 *
 * Authors:
 *  Anthony Liguori  <aliguori@us.ibm.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 *
 */

#include "virtio_pci_legacy.c"

/* wait for pending irq handlers */
void vp_synchronize_vectors(struct virtio_device *vdev)
{
	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	int i;

	if (vp_dev->intx_enabled)
		synchronize_irq(vp_dev->pci_dev->irq);

	for (i = 0; i < vp_dev->msix_vectors; ++i)
		synchronize_irq(vp_dev->msix_entries[i].vector);
}

/* the notify function used when creating a virt queue */
bool vp_notify(struct virtqueue *vq)
{
	/* we write the queue's selector into the notification register to
	 * signal the other end */
	iowrite16(vq->index, (void __iomem *)vq->priv);
	return true;
}

/* Handle a configuration change: Tell driver if it wants to know. */
static irqreturn_t vp_config_changed(int irq, void *opaque)
{
	struct virtio_pci_device *vp_dev = opaque;

	virtio_config_changed(&vp_dev->vdev);
	return IRQ_HANDLED;
}

/* Notify all virtqueues on an interrupt. */
static irqreturn_t vp_vring_interrupt(int irq, void *opaque)
{
	struct virtio_pci_device *vp_dev = opaque;
	struct virtio_pci_vq_info *info;
	irqreturn_t ret = IRQ_NONE;
	unsigned long flags;

	spin_lock_irqsave(&vp_dev->lock, flags);
	list_for_each_entry(info, &vp_dev->virtqueues, node) {
		if (vring_interrupt(irq, info->vq) == IRQ_HANDLED)
			ret = IRQ_HANDLED;
	}
	spin_unlock_irqrestore(&vp_dev->lock, flags);

	return ret;
}

/* A small wrapper to also acknowledge the interrupt when it's handled.
 * I really need an EIO hook for the vring so I can ack the interrupt once we
 * know that we'll be handling the IRQ but before we invoke the callback since
 * the callback may notify the host which results in the host attempting to
 * raise an interrupt that we would then mask once we acknowledged the
 * interrupt. */
static irqreturn_t vp_interrupt(int irq, void *opaque)
{
	struct virtio_pci_device *vp_dev = opaque;
	u8 isr;

	/* reading the ISR has the effect of also clearing it so it's very
	 * important to save off the value. */
	isr = ioread8(vp_dev->isr);

	/* It's definitely not us if the ISR was not high */
	if (!isr)
		return IRQ_NONE;

	/* Configuration change?  Tell driver if it wants to know. */
	if (isr & VIRTIO_PCI_ISR_CONFIG)
		vp_config_changed(irq, opaque);

	return vp_vring_interrupt(irq, opaque);
}

static void vp_free_vectors(struct virtio_device *vdev)
{
	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	int i;

	if (vp_dev->intx_enabled) {
		free_irq(vp_dev->pci_dev->irq, vp_dev);
		vp_dev->intx_enabled = 0;
	}

	for (i = 0; i < vp_dev->msix_used_vectors; ++i)
		free_irq(vp_dev->msix_entries[i].vector, vp_dev);

	for (i = 0; i < vp_dev->msix_vectors; i++)
		if (vp_dev->msix_affinity_masks[i])
			free_cpumask_var(vp_dev->msix_affinity_masks[i]);

	if (vp_dev->msix_enabled) {
		/* Disable the vector used for configuration */
		vp_dev->config_vector(vp_dev, VIRTIO_MSI_NO_VECTOR);

		pci_disable_msix(vp_dev->pci_dev);
		vp_dev->msix_enabled = 0;
	}

	vp_dev->msix_vectors = 0;
	vp_dev->msix_used_vectors = 0;
	kfree(vp_dev->msix_names);
	vp_dev->msix_names = NULL;
	kfree(vp_dev->msix_entries);
	vp_dev->msix_entries = NULL;
	kfree(vp_dev->msix_affinity_masks);
	vp_dev->msix_affinity_masks = NULL;
}

static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
				   bool per_vq_vectors)
{
	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	const char *name = dev_name(&vp_dev->vdev.dev);
	unsigned i, v;
	int err = -ENOMEM;

	vp_dev->msix_vectors = nvectors;

	vp_dev->msix_entries = kmalloc(nvectors * sizeof *vp_dev->msix_entries,
				       GFP_KERNEL);
	if (!vp_dev->msix_entries)
		goto error;
	vp_dev->msix_names = kmalloc(nvectors * sizeof *vp_dev->msix_names,
				     GFP_KERNEL);
	if (!vp_dev->msix_names)
		goto error;
	vp_dev->msix_affinity_masks
		= kzalloc(nvectors * sizeof *vp_dev->msix_affinity_masks,
			  GFP_KERNEL);
	if (!vp_dev->msix_affinity_masks)
		goto error;
	for (i = 0; i < nvectors; ++i)
		if (!alloc_cpumask_var(&vp_dev->msix_affinity_masks[i],
					GFP_KERNEL))
			goto error;

	for (i = 0; i < nvectors; ++i)
		vp_dev->msix_entries[i].entry = i;

	err = pci_enable_msix_exact(vp_dev->pci_dev,
				    vp_dev->msix_entries, nvectors);
	if (err)
		goto error;
	vp_dev->msix_enabled = 1;

	/* Set the vector used for configuration */
	v = vp_dev->msix_used_vectors;
	snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
		 "%s-config", name);
	err = request_irq(vp_dev->msix_entries[v].vector,
			  vp_config_changed, 0, vp_dev->msix_names[v],
			  vp_dev);
	if (err)
		goto error;
	++vp_dev->msix_used_vectors;

	v = vp_dev->config_vector(vp_dev, v);
	/* Verify we had enough resources to assign the vector */
	if (v == VIRTIO_MSI_NO_VECTOR) {
		err = -EBUSY;
		goto error;
	}

	if (!per_vq_vectors) {
		/* Shared vector for all VQs */
		v = vp_dev->msix_used_vectors;
		snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
			 "%s-virtqueues", name);
		err = request_irq(vp_dev->msix_entries[v].vector,
				  vp_vring_interrupt, 0, vp_dev->msix_names[v],
				  vp_dev);
		if (err)
			goto error;
		++vp_dev->msix_used_vectors;
	}
	return 0;
error:
	vp_free_vectors(vdev);
	return err;
}

static int vp_request_intx(struct virtio_device *vdev)
{
	int err;
	struct virtio_pci_device *vp_dev = to_vp_device(vdev);

	err = request_irq(vp_dev->pci_dev->irq, vp_interrupt,
			  IRQF_SHARED, dev_name(&vdev->dev), vp_dev);
	if (!err)
		vp_dev->intx_enabled = 1;
	return err;
}

static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned index,
				     void (*callback)(struct virtqueue *vq),
				     const char *name,
				     u16 msix_vec)
{
	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	struct virtio_pci_vq_info *info = kmalloc(sizeof *info, GFP_KERNEL);
	struct virtqueue *vq;
	unsigned long flags;

	/* fill out our structure that represents an active queue */
	if (!info)
		return ERR_PTR(-ENOMEM);

	vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, msix_vec);
	if (IS_ERR(vq))
		goto out_info;

	info->vq = vq;
	if (callback) {
		spin_lock_irqsave(&vp_dev->lock, flags);
		list_add(&info->node, &vp_dev->virtqueues);
		spin_unlock_irqrestore(&vp_dev->lock, flags);
	} else {
		INIT_LIST_HEAD(&info->node);
	}

	vp_dev->vqs[index] = info;
	return vq;

out_info:
	kfree(info);
	return vq;
}

static void vp_del_vq(struct virtqueue *vq)
{
	struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
	struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
	unsigned long flags;

	spin_lock_irqsave(&vp_dev->lock, flags);
	list_del(&info->node);
	spin_unlock_irqrestore(&vp_dev->lock, flags);

	vp_dev->del_vq(info);
	kfree(info);
}

/* the config->del_vqs() implementation */
void vp_del_vqs(struct virtio_device *vdev)
{
	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	struct virtqueue *vq, *n;
	struct virtio_pci_vq_info *info;

	list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
		info = vp_dev->vqs[vq->index];
		if (vp_dev->per_vq_vectors &&
			info->msix_vector != VIRTIO_MSI_NO_VECTOR)
			free_irq(vp_dev->msix_entries[info->msix_vector].vector,
				 vq);
		vp_del_vq(vq);
	}
	vp_dev->per_vq_vectors = false;

	vp_free_vectors(vdev);
	kfree(vp_dev->vqs);
}

static int vp_try_to_find_vqs(struct virtio_device *vdev, unsigned nvqs,
			      struct virtqueue *vqs[],
			      vq_callback_t *callbacks[],
			      const char *names[],
			      bool use_msix,
			      bool per_vq_vectors)
{
	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	u16 msix_vec;
	int i, err, nvectors, allocated_vectors;

	vp_dev->vqs = kmalloc(nvqs * sizeof *vp_dev->vqs, GFP_KERNEL);
	if (!vp_dev->vqs)
		return -ENOMEM;

	if (!use_msix) {
		/* Old style: one normal interrupt for change and all vqs. */
		err = vp_request_intx(vdev);
		if (err)
			goto error_find;
	} else {
		if (per_vq_vectors) {
			/* Best option: one for change interrupt, one per vq. */
			nvectors = 1;
			for (i = 0; i < nvqs; ++i)
				if (callbacks[i])
					++nvectors;
		} else {
			/* Second best: one for change, shared for all vqs. */
			nvectors = 2;
		}

		err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors);
		if (err)
			goto error_find;
	}

	vp_dev->per_vq_vectors = per_vq_vectors;
	allocated_vectors = vp_dev->msix_used_vectors;
	for (i = 0; i < nvqs; ++i) {
		if (!names[i]) {
			vqs[i] = NULL;
			continue;
		} else if (!callbacks[i] || !vp_dev->msix_enabled)
			msix_vec = VIRTIO_MSI_NO_VECTOR;
		else if (vp_dev->per_vq_vectors)
			msix_vec = allocated_vectors++;
		else
			msix_vec = VP_MSIX_VQ_VECTOR;
		vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i], msix_vec);
		if (IS_ERR(vqs[i])) {
			err = PTR_ERR(vqs[i]);
			goto error_find;
		}

		if (!vp_dev->per_vq_vectors || msix_vec == VIRTIO_MSI_NO_VECTOR)
			continue;

		/* allocate per-vq irq if available and necessary */
		snprintf(vp_dev->msix_names[msix_vec],
			 sizeof *vp_dev->msix_names,
			 "%s-%s",
			 dev_name(&vp_dev->vdev.dev), names[i]);
		err = request_irq(vp_dev->msix_entries[msix_vec].vector,
				  vring_interrupt, 0,
				  vp_dev->msix_names[msix_vec],
				  vqs[i]);
		if (err) {
			vp_del_vq(vqs[i]);
			goto error_find;
		}
	}
	return 0;

error_find:
	vp_del_vqs(vdev);
	return err;
}

/* the config->find_vqs() implementation */
int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
		struct virtqueue *vqs[],
		vq_callback_t *callbacks[],
		const char *names[])
{
	int err;

	/* Try MSI-X with one vector per queue. */
	err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names, true, true);
	if (!err)
		return 0;
	/* Fallback: MSI-X with one vector for config, one shared for queues. */
	err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names,
				 true, false);
	if (!err)
		return 0;
	/* Finally fall back to regular interrupts. */
	return vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names,
				  false, false);
}

const char *vp_bus_name(struct virtio_device *vdev)
{
	struct virtio_pci_device *vp_dev = to_vp_device(vdev);

	return pci_name(vp_dev->pci_dev);
}

/* Setup the affinity for a virtqueue:
 * - force the affinity for per vq vector
 * - OR over all affinities for shared MSI
 * - ignore the affinity request if we're using INTX
 */
int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
{
	struct virtio_device *vdev = vq->vdev;
	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
	struct cpumask *mask;
	unsigned int irq;

	if (!vq->callback)
		return -EINVAL;

	if (vp_dev->msix_enabled) {
		mask = vp_dev->msix_affinity_masks[info->msix_vector];
		irq = vp_dev->msix_entries[info->msix_vector].vector;
		if (cpu == -1)
			irq_set_affinity_hint(irq, NULL);
		else {
			cpumask_set_cpu(cpu, mask);
			irq_set_affinity_hint(irq, mask);
		}
	}
	return 0;
}

void virtio_pci_release_dev(struct device *_d)
{
	/*
	 * No need for a release method as we allocate/free
	 * all devices together with the pci devices.
	 * Provide an empty one to avoid getting a warning from core.
	 */
}

#ifdef CONFIG_PM_SLEEP
static int virtio_pci_freeze(struct device *dev)
{
	struct pci_dev *pci_dev = to_pci_dev(dev);
	struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
	int ret;

	ret = virtio_device_freeze(&vp_dev->vdev);

	if (!ret)
		pci_disable_device(pci_dev);
	return ret;
}

static int virtio_pci_restore(struct device *dev)
{
	struct pci_dev *pci_dev = to_pci_dev(dev);
	struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
	int ret;

	ret = pci_enable_device(pci_dev);
	if (ret)
		return ret;

	pci_set_master(pci_dev);
	return virtio_device_restore(&vp_dev->vdev);
}

const struct dev_pm_ops virtio_pci_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(virtio_pci_freeze, virtio_pci_restore)
};
#endif
Commit	Line	Data
3343660d AL	1	/*
	2	* Virtio PCI driver
	3	*
	4	* This module allows virtio devices to be used over a virtual PCI device.
	5	* This can be used with QEMU based VMMs like KVM or Xen.
	6	*
	7	* Copyright IBM Corp. 2007
	8	*
	9	* Authors:
	10	* Anthony Liguori <aliguori@us.ibm.com>
	11	*
	12	* This work is licensed under the terms of the GNU GPL, version 2 or later.
	13	* See the COPYING file in the top-level directory.
	14	*
	15	*/
	16
38eb4a29	17	#include "virtio_pci_legacy.c"
3343660d	18
e6af578c	19	/* wait for pending irq handlers */
38eb4a29	20	void vp_synchronize_vectors(struct virtio_device *vdev)
e6af578c MT	21	{
	22	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	23	int i;
	24
	25	if (vp_dev->intx_enabled)
	26	synchronize_irq(vp_dev->pci_dev->irq);
	27
	28	for (i = 0; i < vp_dev->msix_vectors; ++i)
	29	synchronize_irq(vp_dev->msix_entries[i].vector);
	30	}
	31
3343660d	32	/* the notify function used when creating a virt queue */
38eb4a29	33	bool vp_notify(struct virtqueue *vq)
3343660d	34	{
3343660d AL	35	/* we write the queue's selector into the notification register to
3343660d AL	36	* signal the other end */
f30eaf4a	37	iowrite16(vq->index, (void __iomem *)vq->priv);
46f9c2b9	38	return true;
3343660d AL	39	}
3343660d AL	40
77cf5246 MT	41	/* Handle a configuration change: Tell driver if it wants to know. */
	42	static irqreturn_t vp_config_changed(int irq, void *opaque)
	43	{
	44	struct virtio_pci_device *vp_dev = opaque;
77cf5246	45
016c98c6	46	virtio_config_changed(&vp_dev->vdev);
77cf5246 MT	47	return IRQ_HANDLED;
	48	}
	49
	50	/* Notify all virtqueues on an interrupt. */
	51	static irqreturn_t vp_vring_interrupt(int irq, void *opaque)
	52	{
	53	struct virtio_pci_device *vp_dev = opaque;
	54	struct virtio_pci_vq_info *info;
	55	irqreturn_t ret = IRQ_NONE;
	56	unsigned long flags;
	57
	58	spin_lock_irqsave(&vp_dev->lock, flags);
	59	list_for_each_entry(info, &vp_dev->virtqueues, node) {
	60	if (vring_interrupt(irq, info->vq) == IRQ_HANDLED)
	61	ret = IRQ_HANDLED;
	62	}
	63	spin_unlock_irqrestore(&vp_dev->lock, flags);
	64
	65	return ret;
	66	}
	67
3343660d AL	68	/* A small wrapper to also acknowledge the interrupt when it's handled.
	69	* I really need an EIO hook for the vring so I can ack the interrupt once we
	70	* know that we'll be handling the IRQ but before we invoke the callback since
	71	* the callback may notify the host which results in the host attempting to
	72	* raise an interrupt that we would then mask once we acknowledged the
	73	* interrupt. */
	74	static irqreturn_t vp_interrupt(int irq, void *opaque)
	75	{
	76	struct virtio_pci_device *vp_dev = opaque;
3343660d AL	77	u8 isr;
	78
	79	/* reading the ISR has the effect of also clearing it so it's very
	80	* important to save off the value. */
af535722	81	isr = ioread8(vp_dev->isr);
3343660d AL	82
	83	/* It's definitely not us if the ISR was not high */
	84	if (!isr)
	85	return IRQ_NONE;
	86
	87	/* Configuration change? Tell driver if it wants to know. */
77cf5246 MT	88	if (isr & VIRTIO_PCI_ISR_CONFIG)
77cf5246 MT	89	vp_config_changed(irq, opaque);
3343660d	90
77cf5246	91	return vp_vring_interrupt(irq, opaque);
3343660d AL	92	}
3343660d AL	93
82af8ce8 MT	94	static void vp_free_vectors(struct virtio_device *vdev)
	95	{
	96	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	97	int i;
	98
	99	if (vp_dev->intx_enabled) {
	100	free_irq(vp_dev->pci_dev->irq, vp_dev);
	101	vp_dev->intx_enabled = 0;
	102	}
	103
	104	for (i = 0; i < vp_dev->msix_used_vectors; ++i)
	105	free_irq(vp_dev->msix_entries[i].vector, vp_dev);
82af8ce8	106
75a0a52b JW	107	for (i = 0; i < vp_dev->msix_vectors; i++)
	108	if (vp_dev->msix_affinity_masks[i])
	109	free_cpumask_var(vp_dev->msix_affinity_masks[i]);
	110
82af8ce8 MT	111	if (vp_dev->msix_enabled) {
82af8ce8 MT	112	/* Disable the vector used for configuration */
6f8f23d6	113	vp_dev->config_vector(vp_dev, VIRTIO_MSI_NO_VECTOR);
82af8ce8	114
82af8ce8	115	pci_disable_msix(vp_dev->pci_dev);
ff52c3fc	116	vp_dev->msix_enabled = 0;
82af8ce8	117	}
ff52c3fc	118
f11335db	119	vp_dev->msix_vectors = 0;
ff52c3fc MT	120	vp_dev->msix_used_vectors = 0;
	121	kfree(vp_dev->msix_names);
	122	vp_dev->msix_names = NULL;
	123	kfree(vp_dev->msix_entries);
	124	vp_dev->msix_entries = NULL;
75a0a52b JW	125	kfree(vp_dev->msix_affinity_masks);
75a0a52b JW	126	vp_dev->msix_affinity_masks = NULL;
82af8ce8 MT	127	}
82af8ce8 MT	128
f68d2408 RR	129	static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
f68d2408 RR	130	bool per_vq_vectors)
82af8ce8 MT	131	{
	132	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	133	const char *name = dev_name(&vp_dev->vdev.dev);
	134	unsigned i, v;
	135	int err = -ENOMEM;
e969fed5	136
f11335db AV	137	vp_dev->msix_vectors = nvectors;
f11335db AV	138
82af8ce8 MT	139	vp_dev->msix_entries = kmalloc(nvectors * sizeof *vp_dev->msix_entries,
	140	GFP_KERNEL);
	141	if (!vp_dev->msix_entries)
ff52c3fc	142	goto error;
82af8ce8 MT	143	vp_dev->msix_names = kmalloc(nvectors * sizeof *vp_dev->msix_names,
	144	GFP_KERNEL);
	145	if (!vp_dev->msix_names)
ff52c3fc	146	goto error;
75a0a52b JW	147	vp_dev->msix_affinity_masks
	148	= kzalloc(nvectors * sizeof *vp_dev->msix_affinity_masks,
	149	GFP_KERNEL);
	150	if (!vp_dev->msix_affinity_masks)
	151	goto error;
	152	for (i = 0; i < nvectors; ++i)
	153	if (!alloc_cpumask_var(&vp_dev->msix_affinity_masks[i],
	154	GFP_KERNEL))
	155	goto error;
82af8ce8 MT	156
	157	for (i = 0; i < nvectors; ++i)
	158	vp_dev->msix_entries[i].entry = i;
	159
5e37f670 AG	160	err = pci_enable_msix_exact(vp_dev->pci_dev,
5e37f670 AG	161	vp_dev->msix_entries, nvectors);
e969fed5 MT	162	if (err)
e969fed5 MT	163	goto error;
e969fed5 MT	164	vp_dev->msix_enabled = 1;
	165
	166	/* Set the vector used for configuration */
	167	v = vp_dev->msix_used_vectors;
	168	snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
	169	"%s-config", name);
	170	err = request_irq(vp_dev->msix_entries[v].vector,
	171	vp_config_changed, 0, vp_dev->msix_names[v],
	172	vp_dev);
	173	if (err)
	174	goto error;
	175	++vp_dev->msix_used_vectors;
82af8ce8	176
6f8f23d6	177	v = vp_dev->config_vector(vp_dev, v);
e969fed5	178	/* Verify we had enough resources to assign the vector */
e969fed5 MT	179	if (v == VIRTIO_MSI_NO_VECTOR) {
	180	err = -EBUSY;
	181	goto error;
82af8ce8 MT	182	}
82af8ce8 MT	183
e969fed5	184	if (!per_vq_vectors) {
82af8ce8 MT	185	/* Shared vector for all VQs */
	186	v = vp_dev->msix_used_vectors;
	187	snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
	188	"%s-virtqueues", name);
	189	err = request_irq(vp_dev->msix_entries[v].vector,
	190	vp_vring_interrupt, 0, vp_dev->msix_names[v],
	191	vp_dev);
	192	if (err)
ff52c3fc	193	goto error;
82af8ce8 MT	194	++vp_dev->msix_used_vectors;
	195	}
	196	return 0;
ff52c3fc	197	error:
82af8ce8	198	vp_free_vectors(vdev);
82af8ce8 MT	199	return err;
	200	}
	201
f68d2408 RR	202	static int vp_request_intx(struct virtio_device *vdev)
	203	{
	204	int err;
	205	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	206
	207	err = request_irq(vp_dev->pci_dev->irq, vp_interrupt,
	208	IRQF_SHARED, dev_name(&vdev->dev), vp_dev);
	209	if (!err)
	210	vp_dev->intx_enabled = 1;
	211	return err;
	212	}
	213
b09f00bb MT	214	static struct virtqueue vp_setup_vq(struct virtio_device vdev, unsigned index,
	215	void (callback)(struct virtqueue vq),
	216	const char *name,
	217	u16 msix_vec)
	218	{
	219	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	220	struct virtio_pci_vq_info info = kmalloc(sizeof info, GFP_KERNEL);
	221	struct virtqueue *vq;
	222	unsigned long flags;
	223
	224	/* fill out our structure that represents an active queue */
	225	if (!info)
	226	return ERR_PTR(-ENOMEM);
	227
	228	vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, msix_vec);
	229	if (IS_ERR(vq))
	230	goto out_info;
	231
	232	info->vq = vq;
005b20a8 KK	233	if (callback) {
	234	spin_lock_irqsave(&vp_dev->lock, flags);
	235	list_add(&info->node, &vp_dev->virtqueues);
	236	spin_unlock_irqrestore(&vp_dev->lock, flags);
	237	} else {
	238	INIT_LIST_HEAD(&info->node);
	239	}
3343660d	240
3ec7a77b	241	vp_dev->vqs[index] = info;
3343660d AL	242	return vq;
3343660d AL	243
3343660d AL	244	out_info:
3343660d AL	245	kfree(info);
b09f00bb	246	return vq;
3343660d AL	247	}
3343660d AL	248
5386cef2 MT	249	static void vp_del_vq(struct virtqueue *vq)
	250	{
	251	struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
	252	struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
	253	unsigned long flags;
	254
	255	spin_lock_irqsave(&vp_dev->lock, flags);
	256	list_del(&info->node);
	257	spin_unlock_irqrestore(&vp_dev->lock, flags);
	258
	259	vp_dev->del_vq(info);
3343660d AL	260	kfree(info);
	261	}
	262
82af8ce8	263	/* the config->del_vqs() implementation */
38eb4a29	264	void vp_del_vqs(struct virtio_device *vdev)
d2a7ddda	265	{
e969fed5	266	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
d2a7ddda	267	struct virtqueue vq, n;
e969fed5	268	struct virtio_pci_vq_info *info;
d2a7ddda	269
e969fed5	270	list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
3ec7a77b	271	info = vp_dev->vqs[vq->index];
31198159 MT	272	if (vp_dev->per_vq_vectors &&
31198159 MT	273	info->msix_vector != VIRTIO_MSI_NO_VECTOR)
f68d2408 RR	274	free_irq(vp_dev->msix_entries[info->msix_vector].vector,
f68d2408 RR	275	vq);
d2a7ddda	276	vp_del_vq(vq);
e969fed5 MT	277	}
e969fed5 MT	278	vp_dev->per_vq_vectors = false;
82af8ce8 MT	279
82af8ce8 MT	280	vp_free_vectors(vdev);
3ec7a77b	281	kfree(vp_dev->vqs);
d2a7ddda MT	282	}
d2a7ddda MT	283
e969fed5 MT	284	static int vp_try_to_find_vqs(struct virtio_device *vdev, unsigned nvqs,
	285	struct virtqueue *vqs[],
	286	vq_callback_t *callbacks[],
	287	const char *names[],
f68d2408	288	bool use_msix,
e969fed5	289	bool per_vq_vectors)
d2a7ddda	290	{
e969fed5	291	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
f68d2408 RR	292	u16 msix_vec;
f68d2408 RR	293	int i, err, nvectors, allocated_vectors;
82af8ce8	294
3ec7a77b MT	295	vp_dev->vqs = kmalloc(nvqs * sizeof *vp_dev->vqs, GFP_KERNEL);
	296	if (!vp_dev->vqs)
	297	return -ENOMEM;
	298
f68d2408 RR	299	if (!use_msix) {
	300	/* Old style: one normal interrupt for change and all vqs. */
	301	err = vp_request_intx(vdev);
	302	if (err)
3ec7a77b	303	goto error_find;
f68d2408 RR	304	} else {
	305	if (per_vq_vectors) {
	306	/* Best option: one for change interrupt, one per vq. */
	307	nvectors = 1;
	308	for (i = 0; i < nvqs; ++i)
	309	if (callbacks[i])
	310	++nvectors;
	311	} else {
	312	/* Second best: one for change, shared for all vqs. */
	313	nvectors = 2;
	314	}
	315
	316	err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors);
	317	if (err)
3ec7a77b	318	goto error_find;
f68d2408	319	}
d2a7ddda	320
e969fed5 MT	321	vp_dev->per_vq_vectors = per_vq_vectors;
e969fed5 MT	322	allocated_vectors = vp_dev->msix_used_vectors;
d2a7ddda	323	for (i = 0; i < nvqs; ++i) {
6457f126 MT	324	if (!names[i]) {
	325	vqs[i] = NULL;
	326	continue;
	327	} else if (!callbacks[i] \|\| !vp_dev->msix_enabled)
f68d2408	328	msix_vec = VIRTIO_MSI_NO_VECTOR;
e969fed5	329	else if (vp_dev->per_vq_vectors)
f68d2408	330	msix_vec = allocated_vectors++;
e969fed5	331	else
f68d2408	332	msix_vec = VP_MSIX_VQ_VECTOR;
b09f00bb	333	vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i], msix_vec);
e969fed5 MT	334	if (IS_ERR(vqs[i])) {
e969fed5 MT	335	err = PTR_ERR(vqs[i]);
82af8ce8	336	goto error_find;
e969fed5	337	}
0b22bd0b MT	338
	339	if (!vp_dev->per_vq_vectors \|\| msix_vec == VIRTIO_MSI_NO_VECTOR)
	340	continue;
	341
e969fed5	342	/* allocate per-vq irq if available and necessary */
0b22bd0b MT	343	snprintf(vp_dev->msix_names[msix_vec],
	344	sizeof *vp_dev->msix_names,
	345	"%s-%s",
	346	dev_name(&vp_dev->vdev.dev), names[i]);
	347	err = request_irq(vp_dev->msix_entries[msix_vec].vector,
	348	vring_interrupt, 0,
	349	vp_dev->msix_names[msix_vec],
	350	vqs[i]);
	351	if (err) {
	352	vp_del_vq(vqs[i]);
	353	goto error_find;
e969fed5	354	}
d2a7ddda MT	355	}
	356	return 0;
	357
82af8ce8	358	error_find:
d2a7ddda	359	vp_del_vqs(vdev);
e969fed5 MT	360	return err;
	361	}
	362
	363	/* the config->find_vqs() implementation */
38eb4a29 MT	364	int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
	365	struct virtqueue *vqs[],
	366	vq_callback_t *callbacks[],
	367	const char *names[])
e969fed5	368	{
f68d2408	369	int err;
e969fed5	370
f68d2408 RR	371	/* Try MSI-X with one vector per queue. */
f68d2408 RR	372	err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names, true, true);
e969fed5 MT	373	if (!err)
e969fed5 MT	374	return 0;
f68d2408	375	/* Fallback: MSI-X with one vector for config, one shared for queues. */
e969fed5	376	err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names,
f68d2408	377	true, false);
e969fed5 MT	378	if (!err)
	379	return 0;
	380	/* Finally fall back to regular interrupts. */
f68d2408 RR	381	return vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names,
f68d2408 RR	382	false, false);
d2a7ddda MT	383	}
d2a7ddda MT	384
38eb4a29	385	const char vp_bus_name(struct virtio_device vdev)
66846048 RJ	386	{
	387	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
	388
	389	return pci_name(vp_dev->pci_dev);
	390	}
	391
75a0a52b JW	392	/* Setup the affinity for a virtqueue:
	393	* - force the affinity for per vq vector
	394	* - OR over all affinities for shared MSI
	395	* - ignore the affinity request if we're using INTX
	396	*/
38eb4a29	397	int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
75a0a52b JW	398	{
	399	struct virtio_device *vdev = vq->vdev;
	400	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
3ec7a77b	401	struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
75a0a52b JW	402	struct cpumask *mask;
	403	unsigned int irq;
	404
	405	if (!vq->callback)
	406	return -EINVAL;
	407
	408	if (vp_dev->msix_enabled) {
	409	mask = vp_dev->msix_affinity_masks[info->msix_vector];
	410	irq = vp_dev->msix_entries[info->msix_vector].vector;
	411	if (cpu == -1)
	412	irq_set_affinity_hint(irq, NULL);
	413	else {
	414	cpumask_set_cpu(cpu, mask);
	415	irq_set_affinity_hint(irq, mask);
	416	}
	417	}
	418	return 0;
	419	}
	420
38eb4a29	421	void virtio_pci_release_dev(struct device *_d)
29f9f12e	422	{
72103bd1 MT	423	/*
	424	* No need for a release method as we allocate/free
	425	* all devices together with the pci devices.
	426	* Provide an empty one to avoid getting a warning from core.
	427	*/
29f9f12e MM	428	}
29f9f12e MM	429
9e266ece	430	#ifdef CONFIG_PM_SLEEP
f0fe6f11 AS	431	static int virtio_pci_freeze(struct device *dev)
	432	{
	433	struct pci_dev *pci_dev = to_pci_dev(dev);
	434	struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
f0fe6f11 AS	435	int ret;
f0fe6f11 AS	436
c6716bae	437	ret = virtio_device_freeze(&vp_dev->vdev);
f0fe6f11 AS	438
	439	if (!ret)
	440	pci_disable_device(pci_dev);
	441	return ret;
	442	}
	443
0517fdd1	444	static int virtio_pci_restore(struct device *dev)
f0fe6f11 AS	445	{
	446	struct pci_dev *pci_dev = to_pci_dev(dev);
	447	struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
	448	int ret;
	449
	450	ret = pci_enable_device(pci_dev);
	451	if (ret)
	452	return ret;
0517fdd1	453
f0fe6f11	454	pci_set_master(pci_dev);
c6716bae	455	return virtio_device_restore(&vp_dev->vdev);
f0fe6f11 AS	456	}
f0fe6f11 AS	457
38eb4a29	458	const struct dev_pm_ops virtio_pci_pm_ops = {
f878d0be	459	SET_SYSTEM_SLEEP_PM_OPS(virtio_pci_freeze, virtio_pci_restore)
d0775363	460	};
3343660d	461	#endif