2007-11-13 04:30:26 +01:00
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/*
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2014-12-08 11:31:02 +01:00
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* Virtio PCI driver - common functionality for all device versions
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2007-11-13 04:30:26 +01:00
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*
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* This module allows virtio devices to be used over a virtual PCI device.
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* This can be used with QEMU based VMMs like KVM or Xen.
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*
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* Copyright IBM Corp. 2007
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2014-12-08 11:31:02 +01:00
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* Copyright Red Hat, Inc. 2014
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2007-11-13 04:30:26 +01:00
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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2014-12-08 11:31:02 +01:00
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* Rusty Russell <rusty@rustcorp.com.au>
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* Michael S. Tsirkin <mst@redhat.com>
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2007-11-13 04:30:26 +01:00
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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2014-12-08 15:39:45 +01:00
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#include "virtio_pci_common.h"
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2007-11-13 04:30:26 +01:00
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2015-01-15 16:54:13 +01:00
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static bool force_legacy = false;
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#if IS_ENABLED(CONFIG_VIRTIO_PCI_LEGACY)
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module_param(force_legacy, bool, 0444);
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MODULE_PARM_DESC(force_legacy,
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"Force legacy mode for transitional virtio 1 devices");
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#endif
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2011-11-17 16:41:15 +01:00
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/* wait for pending irq handlers */
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2014-12-07 17:41:16 +01:00
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void vp_synchronize_vectors(struct virtio_device *vdev)
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2011-11-17 16:41:15 +01:00
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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int i;
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2017-04-04 20:15:41 +02:00
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if (vp_dev->intx_enabled)
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synchronize_irq(vp_dev->pci_dev->irq);
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for (i = 0; i < vp_dev->msix_vectors; ++i)
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2016-11-17 11:43:13 +01:00
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synchronize_irq(pci_irq_vector(vp_dev->pci_dev, i));
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2011-11-17 16:41:15 +01:00
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}
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2007-11-13 04:30:26 +01:00
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/* the notify function used when creating a virt queue */
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2014-12-07 17:41:16 +01:00
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bool vp_notify(struct virtqueue *vq)
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2007-11-13 04:30:26 +01:00
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{
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/* we write the queue's selector into the notification register to
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* signal the other end */
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2014-12-03 17:01:58 +01:00
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iowrite16(vq->index, (void __iomem *)vq->priv);
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2013-10-29 00:08:50 +01:00
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return true;
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2007-11-13 04:30:26 +01:00
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}
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2009-05-14 12:55:31 +02:00
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/* Handle a configuration change: Tell driver if it wants to know. */
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static irqreturn_t vp_config_changed(int irq, void *opaque)
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{
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struct virtio_pci_device *vp_dev = opaque;
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2014-10-14 02:10:34 +02:00
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virtio_config_changed(&vp_dev->vdev);
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2009-05-14 12:55:31 +02:00
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return IRQ_HANDLED;
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}
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/* Notify all virtqueues on an interrupt. */
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static irqreturn_t vp_vring_interrupt(int irq, void *opaque)
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{
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struct virtio_pci_device *vp_dev = opaque;
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2017-04-04 20:44:44 +02:00
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struct virtio_pci_vq_info *info;
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2009-05-14 12:55:31 +02:00
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irqreturn_t ret = IRQ_NONE;
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2017-04-04 20:44:44 +02:00
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unsigned long flags;
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2009-05-14 12:55:31 +02:00
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2017-04-04 20:44:44 +02:00
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spin_lock_irqsave(&vp_dev->lock, flags);
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list_for_each_entry(info, &vp_dev->virtqueues, node) {
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if (vring_interrupt(irq, info->vq) == IRQ_HANDLED)
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2009-05-14 12:55:31 +02:00
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ret = IRQ_HANDLED;
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}
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2017-04-04 20:44:44 +02:00
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spin_unlock_irqrestore(&vp_dev->lock, flags);
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2009-05-14 12:55:31 +02:00
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return ret;
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}
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2007-11-13 04:30:26 +01:00
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/* A small wrapper to also acknowledge the interrupt when it's handled.
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* I really need an EIO hook for the vring so I can ack the interrupt once we
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* know that we'll be handling the IRQ but before we invoke the callback since
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* the callback may notify the host which results in the host attempting to
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* raise an interrupt that we would then mask once we acknowledged the
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* interrupt. */
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static irqreturn_t vp_interrupt(int irq, void *opaque)
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{
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struct virtio_pci_device *vp_dev = opaque;
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u8 isr;
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/* reading the ISR has the effect of also clearing it so it's very
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* important to save off the value. */
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2014-12-02 13:35:27 +01:00
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isr = ioread8(vp_dev->isr);
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2007-11-13 04:30:26 +01:00
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/* It's definitely not us if the ISR was not high */
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if (!isr)
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return IRQ_NONE;
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/* Configuration change? Tell driver if it wants to know. */
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2009-05-14 12:55:31 +02:00
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if (isr & VIRTIO_PCI_ISR_CONFIG)
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vp_config_changed(irq, opaque);
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2007-11-13 04:30:26 +01:00
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2009-05-14 12:55:31 +02:00
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return vp_vring_interrupt(irq, opaque);
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2007-11-13 04:30:26 +01:00
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}
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2017-04-04 20:15:41 +02:00
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static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
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bool per_vq_vectors, struct irq_affinity *desc)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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const char *name = dev_name(&vp_dev->vdev.dev);
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2017-08-24 18:07:02 +02:00
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unsigned flags = PCI_IRQ_MSIX;
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2017-04-04 20:15:41 +02:00
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unsigned i, v;
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int err = -ENOMEM;
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vp_dev->msix_vectors = nvectors;
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treewide: kmalloc() -> kmalloc_array()
The kmalloc() function has a 2-factor argument form, kmalloc_array(). This
patch replaces cases of:
kmalloc(a * b, gfp)
with:
kmalloc_array(a * b, gfp)
as well as handling cases of:
kmalloc(a * b * c, gfp)
with:
kmalloc(array3_size(a, b, c), gfp)
as it's slightly less ugly than:
kmalloc_array(array_size(a, b), c, gfp)
This does, however, attempt to ignore constant size factors like:
kmalloc(4 * 1024, gfp)
though any constants defined via macros get caught up in the conversion.
Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.
The tools/ directory was manually excluded, since it has its own
implementation of kmalloc().
The Coccinelle script used for this was:
// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@
(
kmalloc(
- (sizeof(TYPE)) * E
+ sizeof(TYPE) * E
, ...)
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kmalloc(
- (sizeof(THING)) * E
+ sizeof(THING) * E
, ...)
)
// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@
(
kmalloc(
- sizeof(u8) * (COUNT)
+ COUNT
, ...)
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kmalloc(
- sizeof(__u8) * (COUNT)
+ COUNT
, ...)
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kmalloc(
- sizeof(char) * (COUNT)
+ COUNT
, ...)
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kmalloc(
- sizeof(unsigned char) * (COUNT)
+ COUNT
, ...)
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kmalloc(
- sizeof(u8) * COUNT
+ COUNT
, ...)
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kmalloc(
- sizeof(__u8) * COUNT
+ COUNT
, ...)
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kmalloc(
- sizeof(char) * COUNT
+ COUNT
, ...)
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kmalloc(
- sizeof(unsigned char) * COUNT
+ COUNT
, ...)
)
// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@
(
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * (COUNT_ID)
+ COUNT_ID, sizeof(TYPE)
, ...)
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- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * COUNT_ID
+ COUNT_ID, sizeof(TYPE)
, ...)
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- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * (COUNT_CONST)
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * COUNT_CONST
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * (COUNT_ID)
+ COUNT_ID, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * COUNT_ID
+ COUNT_ID, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * (COUNT_CONST)
+ COUNT_CONST, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * COUNT_CONST
+ COUNT_CONST, sizeof(THING)
, ...)
)
// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@
- kmalloc
+ kmalloc_array
(
- SIZE * COUNT
+ COUNT, SIZE
, ...)
// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@
(
kmalloc(
- sizeof(TYPE) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(TYPE) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(TYPE) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(TYPE) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(THING) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kmalloc(
- sizeof(THING) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kmalloc(
- sizeof(THING) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kmalloc(
- sizeof(THING) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
)
// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@
(
kmalloc(
- sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kmalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kmalloc(
- sizeof(THING1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kmalloc(
- sizeof(THING1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kmalloc(
- sizeof(TYPE1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
|
kmalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
)
// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@
(
kmalloc(
- (COUNT) * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- (COUNT) * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- (COUNT) * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- (COUNT) * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
)
// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@
(
kmalloc(C1 * C2 * C3, ...)
|
kmalloc(
- (E1) * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
|
kmalloc(
- (E1) * (E2) * E3
+ array3_size(E1, E2, E3)
, ...)
|
kmalloc(
- (E1) * (E2) * (E3)
+ array3_size(E1, E2, E3)
, ...)
|
kmalloc(
- E1 * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
)
// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@
(
kmalloc(sizeof(THING) * C2, ...)
|
kmalloc(sizeof(TYPE) * C2, ...)
|
kmalloc(C1 * C2 * C3, ...)
|
kmalloc(C1 * C2, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * (E2)
+ E2, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * E2
+ E2, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * (E2)
+ E2, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * E2
+ E2, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- (E1) * E2
+ E1, E2
, ...)
|
- kmalloc
+ kmalloc_array
(
- (E1) * (E2)
+ E1, E2
, ...)
|
- kmalloc
+ kmalloc_array
(
- E1 * E2
+ E1, E2
, ...)
)
Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 22:55:00 +02:00
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vp_dev->msix_names = kmalloc_array(nvectors,
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sizeof(*vp_dev->msix_names),
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GFP_KERNEL);
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2017-04-04 20:15:41 +02:00
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if (!vp_dev->msix_names)
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goto error;
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vp_dev->msix_affinity_masks
|
treewide: kzalloc() -> kcalloc()
The kzalloc() function has a 2-factor argument form, kcalloc(). This
patch replaces cases of:
kzalloc(a * b, gfp)
with:
kcalloc(a * b, gfp)
as well as handling cases of:
kzalloc(a * b * c, gfp)
with:
kzalloc(array3_size(a, b, c), gfp)
as it's slightly less ugly than:
kzalloc_array(array_size(a, b), c, gfp)
This does, however, attempt to ignore constant size factors like:
kzalloc(4 * 1024, gfp)
though any constants defined via macros get caught up in the conversion.
Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.
The Coccinelle script used for this was:
// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@
(
kzalloc(
- (sizeof(TYPE)) * E
+ sizeof(TYPE) * E
, ...)
|
kzalloc(
- (sizeof(THING)) * E
+ sizeof(THING) * E
, ...)
)
// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@
(
kzalloc(
- sizeof(u8) * (COUNT)
+ COUNT
, ...)
|
kzalloc(
- sizeof(__u8) * (COUNT)
+ COUNT
, ...)
|
kzalloc(
- sizeof(char) * (COUNT)
+ COUNT
, ...)
|
kzalloc(
- sizeof(unsigned char) * (COUNT)
+ COUNT
, ...)
|
kzalloc(
- sizeof(u8) * COUNT
+ COUNT
, ...)
|
kzalloc(
- sizeof(__u8) * COUNT
+ COUNT
, ...)
|
kzalloc(
- sizeof(char) * COUNT
+ COUNT
, ...)
|
kzalloc(
- sizeof(unsigned char) * COUNT
+ COUNT
, ...)
)
// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@
(
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * (COUNT_ID)
+ COUNT_ID, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * COUNT_ID
+ COUNT_ID, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * (COUNT_CONST)
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * COUNT_CONST
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * (COUNT_ID)
+ COUNT_ID, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * COUNT_ID
+ COUNT_ID, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * (COUNT_CONST)
+ COUNT_CONST, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * COUNT_CONST
+ COUNT_CONST, sizeof(THING)
, ...)
)
// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@
- kzalloc
+ kcalloc
(
- SIZE * COUNT
+ COUNT, SIZE
, ...)
// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@
(
kzalloc(
- sizeof(TYPE) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kzalloc(
- sizeof(TYPE) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kzalloc(
- sizeof(TYPE) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kzalloc(
- sizeof(TYPE) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kzalloc(
- sizeof(THING) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kzalloc(
- sizeof(THING) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kzalloc(
- sizeof(THING) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kzalloc(
- sizeof(THING) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
)
// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@
(
kzalloc(
- sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kzalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kzalloc(
- sizeof(THING1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kzalloc(
- sizeof(THING1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kzalloc(
- sizeof(TYPE1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
|
kzalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
)
// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@
(
kzalloc(
- (COUNT) * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- COUNT * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- COUNT * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- (COUNT) * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- COUNT * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- (COUNT) * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- (COUNT) * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- COUNT * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
)
// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@
(
kzalloc(C1 * C2 * C3, ...)
|
kzalloc(
- (E1) * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
|
kzalloc(
- (E1) * (E2) * E3
+ array3_size(E1, E2, E3)
, ...)
|
kzalloc(
- (E1) * (E2) * (E3)
+ array3_size(E1, E2, E3)
, ...)
|
kzalloc(
- E1 * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
)
// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@
(
kzalloc(sizeof(THING) * C2, ...)
|
kzalloc(sizeof(TYPE) * C2, ...)
|
kzalloc(C1 * C2 * C3, ...)
|
kzalloc(C1 * C2, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * (E2)
+ E2, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * E2
+ E2, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * (E2)
+ E2, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * E2
+ E2, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- (E1) * E2
+ E1, E2
, ...)
|
- kzalloc
+ kcalloc
(
- (E1) * (E2)
+ E1, E2
, ...)
|
- kzalloc
+ kcalloc
(
- E1 * E2
+ E1, E2
, ...)
)
Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 23:03:40 +02:00
|
|
|
= kcalloc(nvectors, sizeof(*vp_dev->msix_affinity_masks),
|
2017-04-04 20:15:41 +02:00
|
|
|
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;
|
|
|
|
|
2017-08-24 18:07:02 +02:00
|
|
|
if (desc) {
|
|
|
|
flags |= PCI_IRQ_AFFINITY;
|
|
|
|
desc->pre_vectors++; /* virtio config vector */
|
|
|
|
}
|
|
|
|
|
2017-04-04 20:15:41 +02:00
|
|
|
err = pci_alloc_irq_vectors_affinity(vp_dev->pci_dev, nvectors,
|
2017-08-24 18:07:02 +02:00
|
|
|
nvectors, flags, desc);
|
2017-04-04 20:15:41 +02:00
|
|
|
if (err < 0)
|
|
|
|
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(pci_irq_vector(vp_dev->pci_dev, v),
|
|
|
|
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(pci_irq_vector(vp_dev->pci_dev, v),
|
|
|
|
vp_vring_interrupt, 0, vp_dev->msix_names[v],
|
|
|
|
vp_dev);
|
|
|
|
if (err)
|
|
|
|
goto error;
|
|
|
|
++vp_dev->msix_used_vectors;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
error:
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2017-04-04 20:44:44 +02:00
|
|
|
static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned index,
|
|
|
|
void (*callback)(struct virtqueue *vq),
|
|
|
|
const char *name,
|
2017-03-06 17:32:29 +01:00
|
|
|
bool ctx,
|
2017-04-04 20:44:44 +02:00
|
|
|
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);
|
|
|
|
|
2017-03-06 17:32:29 +01:00
|
|
|
vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, ctx,
|
2017-04-04 20:44:44 +02:00
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
2017-04-04 20:15:41 +02:00
|
|
|
/* the config->del_vqs() implementation */
|
|
|
|
void vp_del_vqs(struct virtio_device *vdev)
|
2009-06-13 06:16:36 +02:00
|
|
|
{
|
2009-07-26 14:48:08 +02:00
|
|
|
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
|
2009-06-13 06:16:36 +02:00
|
|
|
struct virtqueue *vq, *n;
|
2017-04-04 20:15:41 +02:00
|
|
|
int i;
|
2009-06-13 06:16:36 +02:00
|
|
|
|
2009-07-26 14:48:08 +02:00
|
|
|
list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
|
2017-04-04 20:44:44 +02:00
|
|
|
if (vp_dev->per_vq_vectors) {
|
|
|
|
int v = vp_dev->vqs[vq->index]->msix_vector;
|
2016-11-17 11:43:13 +01:00
|
|
|
|
2017-03-08 09:09:27 +01:00
|
|
|
if (v != VIRTIO_MSI_NO_VECTOR) {
|
|
|
|
int irq = pci_irq_vector(vp_dev->pci_dev, v);
|
|
|
|
|
|
|
|
irq_set_affinity_hint(irq, NULL);
|
|
|
|
free_irq(irq, vq);
|
|
|
|
}
|
2016-11-17 11:43:13 +01:00
|
|
|
}
|
2017-04-04 20:44:44 +02:00
|
|
|
vp_del_vq(vq);
|
2009-07-26 14:48:08 +02:00
|
|
|
}
|
2017-04-04 20:44:44 +02:00
|
|
|
vp_dev->per_vq_vectors = false;
|
2009-05-14 12:55:41 +02:00
|
|
|
|
2017-04-04 20:15:41 +02:00
|
|
|
if (vp_dev->intx_enabled) {
|
|
|
|
free_irq(vp_dev->pci_dev->irq, vp_dev);
|
|
|
|
vp_dev->intx_enabled = 0;
|
|
|
|
}
|
2016-11-17 11:43:15 +01:00
|
|
|
|
2017-04-04 20:15:41 +02:00
|
|
|
for (i = 0; i < vp_dev->msix_used_vectors; ++i)
|
|
|
|
free_irq(pci_irq_vector(vp_dev->pci_dev, i), vp_dev);
|
2016-11-17 11:43:15 +01:00
|
|
|
|
2017-04-04 20:15:41 +02:00
|
|
|
for (i = 0; i < vp_dev->msix_vectors; i++)
|
|
|
|
if (vp_dev->msix_affinity_masks[i])
|
2017-02-05 18:15:19 +01:00
|
|
|
free_cpumask_var(vp_dev->msix_affinity_masks[i]);
|
|
|
|
|
2017-04-04 20:15:41 +02:00
|
|
|
if (vp_dev->msix_enabled) {
|
2016-11-17 11:43:15 +01:00
|
|
|
/* Disable the vector used for configuration */
|
|
|
|
vp_dev->config_vector(vp_dev, VIRTIO_MSI_NO_VECTOR);
|
|
|
|
|
2017-04-04 20:15:41 +02:00
|
|
|
pci_free_irq_vectors(vp_dev->pci_dev);
|
|
|
|
vp_dev->msix_enabled = 0;
|
2016-11-17 11:43:15 +01:00
|
|
|
}
|
|
|
|
|
2017-04-04 20:15:41 +02:00
|
|
|
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_affinity_masks);
|
|
|
|
vp_dev->msix_affinity_masks = NULL;
|
2017-04-04 20:44:44 +02:00
|
|
|
kfree(vp_dev->vqs);
|
|
|
|
vp_dev->vqs = NULL;
|
2009-06-13 06:16:36 +02:00
|
|
|
}
|
|
|
|
|
2016-11-17 11:43:16 +01:00
|
|
|
static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
|
2017-02-05 18:15:21 +01:00
|
|
|
struct virtqueue *vqs[], vq_callback_t *callbacks[],
|
2017-04-04 20:08:54 +02:00
|
|
|
const char * const names[], bool per_vq_vectors,
|
2017-03-06 17:32:29 +01:00
|
|
|
const bool *ctx,
|
2017-04-04 20:08:54 +02:00
|
|
|
struct irq_affinity *desc)
|
2009-06-13 06:16:36 +02:00
|
|
|
{
|
2009-07-26 14:48:08 +02:00
|
|
|
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
|
2009-09-24 06:26:29 +02:00
|
|
|
u16 msix_vec;
|
2017-04-04 20:15:41 +02:00
|
|
|
int i, err, nvectors, allocated_vectors;
|
2009-05-14 12:55:41 +02:00
|
|
|
|
2017-04-04 20:44:44 +02:00
|
|
|
vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL);
|
|
|
|
if (!vp_dev->vqs)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2017-04-04 20:08:54 +02:00
|
|
|
if (per_vq_vectors) {
|
2017-04-04 20:15:41 +02:00
|
|
|
/* Best option: one for change interrupt, one per vq. */
|
|
|
|
nvectors = 1;
|
|
|
|
for (i = 0; i < nvqs; ++i)
|
|
|
|
if (callbacks[i])
|
|
|
|
++nvectors;
|
2017-04-04 20:08:54 +02:00
|
|
|
} else {
|
2017-04-04 20:15:41 +02:00
|
|
|
/* Second best: one for change, shared for all vqs. */
|
|
|
|
nvectors = 2;
|
2017-02-05 18:15:19 +01:00
|
|
|
}
|
|
|
|
|
2017-04-04 20:15:41 +02:00
|
|
|
err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors,
|
|
|
|
per_vq_vectors ? desc : NULL);
|
2016-11-17 11:43:16 +01:00
|
|
|
if (err)
|
2017-04-04 20:15:41 +02:00
|
|
|
goto error_find;
|
2016-11-17 11:43:16 +01:00
|
|
|
|
2017-04-04 20:44:44 +02:00
|
|
|
vp_dev->per_vq_vectors = per_vq_vectors;
|
2017-04-04 20:15:41 +02:00
|
|
|
allocated_vectors = vp_dev->msix_used_vectors;
|
2009-06-13 06:16:36 +02:00
|
|
|
for (i = 0; i < nvqs; ++i) {
|
2012-09-05 20:47:45 +02:00
|
|
|
if (!names[i]) {
|
|
|
|
vqs[i] = NULL;
|
|
|
|
continue;
|
2016-11-17 11:43:16 +01:00
|
|
|
}
|
|
|
|
|
2017-04-04 20:15:41 +02:00
|
|
|
if (!callbacks[i])
|
2017-02-05 18:15:19 +01:00
|
|
|
msix_vec = VIRTIO_MSI_NO_VECTOR;
|
2017-04-04 20:44:44 +02:00
|
|
|
else if (vp_dev->per_vq_vectors)
|
2017-04-04 20:15:41 +02:00
|
|
|
msix_vec = allocated_vectors++;
|
|
|
|
else
|
|
|
|
msix_vec = VP_MSIX_VQ_VECTOR;
|
2017-04-04 20:44:44 +02:00
|
|
|
vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i],
|
2017-03-06 17:32:29 +01:00
|
|
|
ctx ? ctx[i] : false,
|
2017-04-04 20:44:44 +02:00
|
|
|
msix_vec);
|
2009-07-26 14:48:08 +02:00
|
|
|
if (IS_ERR(vqs[i])) {
|
|
|
|
err = PTR_ERR(vqs[i]);
|
2017-04-04 20:15:41 +02:00
|
|
|
goto error_find;
|
2009-07-26 14:48:08 +02:00
|
|
|
}
|
2009-10-22 15:06:06 +02:00
|
|
|
|
2017-04-04 20:44:44 +02:00
|
|
|
if (!vp_dev->per_vq_vectors || msix_vec == VIRTIO_MSI_NO_VECTOR)
|
2017-02-05 18:15:18 +01:00
|
|
|
continue;
|
|
|
|
|
2017-04-04 20:15:41 +02:00
|
|
|
/* allocate per-vq irq if available and necessary */
|
|
|
|
snprintf(vp_dev->msix_names[msix_vec],
|
|
|
|
sizeof *vp_dev->msix_names,
|
|
|
|
"%s-%s",
|
2009-10-22 15:06:06 +02:00
|
|
|
dev_name(&vp_dev->vdev.dev), names[i]);
|
2016-11-17 11:43:13 +01:00
|
|
|
err = request_irq(pci_irq_vector(vp_dev->pci_dev, msix_vec),
|
2017-04-04 20:15:41 +02:00
|
|
|
vring_interrupt, 0,
|
|
|
|
vp_dev->msix_names[msix_vec],
|
|
|
|
vqs[i]);
|
2017-04-04 20:44:44 +02:00
|
|
|
if (err)
|
2017-04-04 20:15:41 +02:00
|
|
|
goto error_find;
|
2009-06-13 06:16:36 +02:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
|
2017-04-04 20:15:41 +02:00
|
|
|
error_find:
|
|
|
|
vp_del_vqs(vdev);
|
2009-07-26 14:48:08 +02:00
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2016-11-17 11:43:16 +01:00
|
|
|
static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned nvqs,
|
|
|
|
struct virtqueue *vqs[], vq_callback_t *callbacks[],
|
2017-03-06 17:32:29 +01:00
|
|
|
const char * const names[], const bool *ctx)
|
2016-11-17 11:43:16 +01:00
|
|
|
{
|
|
|
|
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
|
|
|
|
int i, err;
|
|
|
|
|
2017-04-04 20:44:44 +02:00
|
|
|
vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL);
|
|
|
|
if (!vp_dev->vqs)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2016-11-17 11:43:16 +01:00
|
|
|
err = request_irq(vp_dev->pci_dev->irq, vp_interrupt, IRQF_SHARED,
|
|
|
|
dev_name(&vdev->dev), vp_dev);
|
|
|
|
if (err)
|
2017-04-04 20:15:41 +02:00
|
|
|
goto out_del_vqs;
|
2016-11-17 11:43:16 +01:00
|
|
|
|
2017-04-04 20:15:41 +02:00
|
|
|
vp_dev->intx_enabled = 1;
|
2017-04-04 20:44:44 +02:00
|
|
|
vp_dev->per_vq_vectors = false;
|
2016-11-17 11:43:16 +01:00
|
|
|
for (i = 0; i < nvqs; ++i) {
|
|
|
|
if (!names[i]) {
|
|
|
|
vqs[i] = NULL;
|
|
|
|
continue;
|
|
|
|
}
|
2017-04-04 20:44:44 +02:00
|
|
|
vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i],
|
2017-03-06 17:32:29 +01:00
|
|
|
ctx ? ctx[i] : false,
|
2017-04-04 20:44:44 +02:00
|
|
|
VIRTIO_MSI_NO_VECTOR);
|
2016-11-17 11:43:16 +01:00
|
|
|
if (IS_ERR(vqs[i])) {
|
|
|
|
err = PTR_ERR(vqs[i]);
|
2017-04-04 20:15:41 +02:00
|
|
|
goto out_del_vqs;
|
2016-11-17 11:43:16 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
2017-04-04 20:15:41 +02:00
|
|
|
out_del_vqs:
|
|
|
|
vp_del_vqs(vdev);
|
2016-11-17 11:43:16 +01:00
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2009-07-26 14:48:08 +02:00
|
|
|
/* the config->find_vqs() implementation */
|
2014-12-07 17:41:16 +01:00
|
|
|
int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
|
2017-02-05 18:15:22 +01:00
|
|
|
struct virtqueue *vqs[], vq_callback_t *callbacks[],
|
2017-03-06 17:32:29 +01:00
|
|
|
const char * const names[], const bool *ctx,
|
|
|
|
struct irq_affinity *desc)
|
2009-07-26 14:48:08 +02:00
|
|
|
{
|
2009-09-24 06:26:29 +02:00
|
|
|
int err;
|
2009-07-26 14:48:08 +02:00
|
|
|
|
2017-04-04 20:08:54 +02:00
|
|
|
/* Try MSI-X with one vector per queue. */
|
2017-03-06 17:32:29 +01:00
|
|
|
err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, true, ctx, desc);
|
2017-04-04 20:08:54 +02:00
|
|
|
if (!err)
|
|
|
|
return 0;
|
|
|
|
/* Fallback: MSI-X with one vector for config, one shared for queues. */
|
2017-03-06 17:32:29 +01:00
|
|
|
err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, false, ctx, desc);
|
2009-07-26 14:48:08 +02:00
|
|
|
if (!err)
|
|
|
|
return 0;
|
2017-04-04 20:08:54 +02:00
|
|
|
/* Finally fall back to regular interrupts. */
|
2017-03-06 17:32:29 +01:00
|
|
|
return vp_find_vqs_intx(vdev, nvqs, vqs, callbacks, names, ctx);
|
2009-06-13 06:16:36 +02:00
|
|
|
}
|
|
|
|
|
2014-12-07 17:41:16 +01:00
|
|
|
const char *vp_bus_name(struct virtio_device *vdev)
|
2011-11-14 15:17:08 +01:00
|
|
|
{
|
|
|
|
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
|
|
|
|
|
|
|
|
return pci_name(vp_dev->pci_dev);
|
|
|
|
}
|
|
|
|
|
2012-08-28 13:54:14 +02:00
|
|
|
/* 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
|
|
|
|
*/
|
2018-08-10 03:18:28 +02:00
|
|
|
int vp_set_vq_affinity(struct virtqueue *vq, const struct cpumask *cpu_mask)
|
2012-08-28 13:54:14 +02:00
|
|
|
{
|
|
|
|
struct virtio_device *vdev = vq->vdev;
|
|
|
|
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
|
2017-04-04 20:44:44 +02:00
|
|
|
struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
|
|
|
|
struct cpumask *mask;
|
|
|
|
unsigned int irq;
|
2012-08-28 13:54:14 +02:00
|
|
|
|
|
|
|
if (!vq->callback)
|
|
|
|
return -EINVAL;
|
|
|
|
|
2017-04-04 20:09:20 +02:00
|
|
|
if (vp_dev->msix_enabled) {
|
2017-04-04 20:44:44 +02:00
|
|
|
mask = vp_dev->msix_affinity_masks[info->msix_vector];
|
|
|
|
irq = pci_irq_vector(vp_dev->pci_dev, info->msix_vector);
|
2018-08-10 03:18:28 +02:00
|
|
|
if (!cpu_mask)
|
2012-08-28 13:54:14 +02:00
|
|
|
irq_set_affinity_hint(irq, NULL);
|
|
|
|
else {
|
2018-08-10 03:18:28 +02:00
|
|
|
cpumask_copy(mask, cpu_mask);
|
2012-08-28 13:54:14 +02:00
|
|
|
irq_set_affinity_hint(irq, mask);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2017-02-05 18:15:23 +01:00
|
|
|
const struct cpumask *vp_get_vq_affinity(struct virtio_device *vdev, int index)
|
|
|
|
{
|
|
|
|
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
|
|
|
|
|
2017-04-04 20:44:44 +02:00
|
|
|
if (!vp_dev->per_vq_vectors ||
|
|
|
|
vp_dev->vqs[index]->msix_vector == VIRTIO_MSI_NO_VECTOR)
|
2017-02-05 18:15:23 +01:00
|
|
|
return NULL;
|
|
|
|
|
2017-04-04 20:44:44 +02:00
|
|
|
return pci_irq_get_affinity(vp_dev->pci_dev,
|
|
|
|
vp_dev->vqs[index]->msix_vector);
|
2017-02-05 18:15:23 +01:00
|
|
|
}
|
|
|
|
|
2013-09-09 02:27:12 +02:00
|
|
|
#ifdef CONFIG_PM_SLEEP
|
2011-12-22 12:28:26 +01:00
|
|
|
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;
|
|
|
|
|
2014-10-14 02:10:35 +02:00
|
|
|
ret = virtio_device_freeze(&vp_dev->vdev);
|
2011-12-22 12:28:26 +01:00
|
|
|
|
|
|
|
if (!ret)
|
|
|
|
pci_disable_device(pci_dev);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2012-03-29 09:24:43 +02:00
|
|
|
static int virtio_pci_restore(struct device *dev)
|
2011-12-22 12:28:26 +01:00
|
|
|
{
|
|
|
|
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;
|
2012-03-29 09:24:43 +02:00
|
|
|
|
2011-12-22 12:28:26 +01:00
|
|
|
pci_set_master(pci_dev);
|
2014-10-14 02:10:35 +02:00
|
|
|
return virtio_device_restore(&vp_dev->vdev);
|
2011-12-22 12:28:26 +01:00
|
|
|
}
|
|
|
|
|
2014-12-11 20:47:49 +01:00
|
|
|
static const struct dev_pm_ops virtio_pci_pm_ops = {
|
2012-03-29 09:28:05 +02:00
|
|
|
SET_SYSTEM_SLEEP_PM_OPS(virtio_pci_freeze, virtio_pci_restore)
|
2011-12-22 12:28:25 +01:00
|
|
|
};
|
2007-11-13 04:30:26 +01:00
|
|
|
#endif
|
2014-12-11 20:47:49 +01:00
|
|
|
|
|
|
|
|
|
|
|
/* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */
|
|
|
|
static const struct pci_device_id virtio_pci_id_table[] = {
|
2016-03-06 23:02:30 +01:00
|
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_REDHAT_QUMRANET, PCI_ANY_ID) },
|
2014-12-11 20:47:49 +01:00
|
|
|
{ 0 }
|
|
|
|
};
|
|
|
|
|
|
|
|
MODULE_DEVICE_TABLE(pci, virtio_pci_id_table);
|
|
|
|
|
2015-01-13 10:23:32 +01:00
|
|
|
static void virtio_pci_release_dev(struct device *_d)
|
|
|
|
{
|
|
|
|
struct virtio_device *vdev = dev_to_virtio(_d);
|
|
|
|
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
|
|
|
|
|
|
|
|
/* As struct device is a kobject, it's not safe to
|
|
|
|
* free the memory (including the reference counter itself)
|
|
|
|
* until it's release callback. */
|
|
|
|
kfree(vp_dev);
|
|
|
|
}
|
|
|
|
|
2014-12-11 20:47:49 +01:00
|
|
|
static int virtio_pci_probe(struct pci_dev *pci_dev,
|
|
|
|
const struct pci_device_id *id)
|
|
|
|
{
|
2017-12-21 13:40:24 +01:00
|
|
|
struct virtio_pci_device *vp_dev, *reg_dev = NULL;
|
2015-01-13 10:23:32 +01:00
|
|
|
int rc;
|
|
|
|
|
|
|
|
/* allocate our structure and fill it out */
|
|
|
|
vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL);
|
|
|
|
if (!vp_dev)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
pci_set_drvdata(pci_dev, vp_dev);
|
|
|
|
vp_dev->vdev.dev.parent = &pci_dev->dev;
|
|
|
|
vp_dev->vdev.dev.release = virtio_pci_release_dev;
|
|
|
|
vp_dev->pci_dev = pci_dev;
|
2017-04-04 20:44:44 +02:00
|
|
|
INIT_LIST_HEAD(&vp_dev->virtqueues);
|
|
|
|
spin_lock_init(&vp_dev->lock);
|
2015-01-13 10:23:32 +01:00
|
|
|
|
|
|
|
/* enable the device */
|
|
|
|
rc = pci_enable_device(pci_dev);
|
|
|
|
if (rc)
|
|
|
|
goto err_enable_device;
|
|
|
|
|
2015-01-15 16:54:13 +01:00
|
|
|
if (force_legacy) {
|
2014-12-11 12:59:51 +01:00
|
|
|
rc = virtio_pci_legacy_probe(vp_dev);
|
2015-01-15 16:54:13 +01:00
|
|
|
/* Also try modern mode if we can't map BAR0 (no IO space). */
|
|
|
|
if (rc == -ENODEV || rc == -ENOMEM)
|
|
|
|
rc = virtio_pci_modern_probe(vp_dev);
|
|
|
|
if (rc)
|
|
|
|
goto err_probe;
|
|
|
|
} else {
|
|
|
|
rc = virtio_pci_modern_probe(vp_dev);
|
|
|
|
if (rc == -ENODEV)
|
|
|
|
rc = virtio_pci_legacy_probe(vp_dev);
|
|
|
|
if (rc)
|
|
|
|
goto err_probe;
|
|
|
|
}
|
2015-01-13 10:23:32 +01:00
|
|
|
|
|
|
|
pci_set_master(pci_dev);
|
|
|
|
|
|
|
|
rc = register_virtio_device(&vp_dev->vdev);
|
2017-12-21 13:40:24 +01:00
|
|
|
reg_dev = vp_dev;
|
2015-01-13 10:23:32 +01:00
|
|
|
if (rc)
|
|
|
|
goto err_register;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
err_register:
|
2014-12-11 12:59:51 +01:00
|
|
|
if (vp_dev->ioaddr)
|
|
|
|
virtio_pci_legacy_remove(vp_dev);
|
|
|
|
else
|
|
|
|
virtio_pci_modern_remove(vp_dev);
|
2015-01-13 10:23:32 +01:00
|
|
|
err_probe:
|
|
|
|
pci_disable_device(pci_dev);
|
|
|
|
err_enable_device:
|
2017-12-21 13:40:24 +01:00
|
|
|
if (reg_dev)
|
|
|
|
put_device(&vp_dev->vdev.dev);
|
|
|
|
else
|
|
|
|
kfree(vp_dev);
|
2015-01-13 10:23:32 +01:00
|
|
|
return rc;
|
2014-12-11 20:47:49 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
static void virtio_pci_remove(struct pci_dev *pci_dev)
|
|
|
|
{
|
2015-01-13 10:23:32 +01:00
|
|
|
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
|
2016-01-14 15:00:41 +01:00
|
|
|
struct device *dev = get_device(&vp_dev->vdev.dev);
|
2015-01-13 10:23:32 +01:00
|
|
|
|
2018-06-01 06:02:39 +02:00
|
|
|
pci_disable_sriov(pci_dev);
|
|
|
|
|
2015-01-13 10:23:32 +01:00
|
|
|
unregister_virtio_device(&vp_dev->vdev);
|
|
|
|
|
2014-12-11 12:59:51 +01:00
|
|
|
if (vp_dev->ioaddr)
|
|
|
|
virtio_pci_legacy_remove(vp_dev);
|
|
|
|
else
|
|
|
|
virtio_pci_modern_remove(vp_dev);
|
2015-01-13 10:23:32 +01:00
|
|
|
|
|
|
|
pci_disable_device(pci_dev);
|
2016-01-14 15:00:41 +01:00
|
|
|
put_device(dev);
|
2014-12-11 20:47:49 +01:00
|
|
|
}
|
|
|
|
|
2018-06-01 06:02:39 +02:00
|
|
|
static int virtio_pci_sriov_configure(struct pci_dev *pci_dev, int num_vfs)
|
|
|
|
{
|
|
|
|
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
|
|
|
|
struct virtio_device *vdev = &vp_dev->vdev;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
if (!(vdev->config->get_status(vdev) & VIRTIO_CONFIG_S_DRIVER_OK))
|
|
|
|
return -EBUSY;
|
|
|
|
|
|
|
|
if (!__virtio_test_bit(vdev, VIRTIO_F_SR_IOV))
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
if (pci_vfs_assigned(pci_dev))
|
|
|
|
return -EPERM;
|
|
|
|
|
|
|
|
if (num_vfs == 0) {
|
|
|
|
pci_disable_sriov(pci_dev);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = pci_enable_sriov(pci_dev, num_vfs);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
return num_vfs;
|
|
|
|
}
|
|
|
|
|
2014-12-11 20:47:49 +01:00
|
|
|
static struct pci_driver virtio_pci_driver = {
|
|
|
|
.name = "virtio-pci",
|
|
|
|
.id_table = virtio_pci_id_table,
|
|
|
|
.probe = virtio_pci_probe,
|
|
|
|
.remove = virtio_pci_remove,
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
|
|
.driver.pm = &virtio_pci_pm_ops,
|
|
|
|
#endif
|
2018-06-01 06:02:39 +02:00
|
|
|
.sriov_configure = virtio_pci_sriov_configure,
|
2014-12-11 20:47:49 +01:00
|
|
|
};
|
|
|
|
|
|
|
|
module_pci_driver(virtio_pci_driver);
|
2014-12-16 23:54:03 +01:00
|
|
|
|
|
|
|
MODULE_AUTHOR("Anthony Liguori <aliguori@us.ibm.com>");
|
|
|
|
MODULE_DESCRIPTION("virtio-pci");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_VERSION("1");
|