blob: 635e1efb3792689b6e283766a64af11be6dc8dc6 [file] [log] [blame]
Anthony Liguori33436602007-11-12 21:30:26 -06001/*
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
17#include <linux/module.h>
18#include <linux/list.h>
19#include <linux/pci.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/slab.h>
Anthony Liguori33436602007-11-12 21:30:26 -060021#include <linux/interrupt.h>
22#include <linux/virtio.h>
23#include <linux/virtio_config.h>
24#include <linux/virtio_ring.h>
25#include <linux/virtio_pci.h>
26#include <linux/highmem.h>
27#include <linux/spinlock.h>
28
29MODULE_AUTHOR("Anthony Liguori <aliguori@us.ibm.com>");
30MODULE_DESCRIPTION("virtio-pci");
31MODULE_LICENSE("GPL");
32MODULE_VERSION("1");
33
34/* Our device structure */
35struct virtio_pci_device
36{
37 struct virtio_device vdev;
38 struct pci_dev *pci_dev;
39
40 /* the IO mapping for the PCI config space */
Al Viro97968352008-03-29 03:09:48 +000041 void __iomem *ioaddr;
Anthony Liguori33436602007-11-12 21:30:26 -060042
43 /* a list of queues so we can dispatch IRQs */
44 spinlock_t lock;
45 struct list_head virtqueues;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +030046
47 /* MSI-X support */
48 int msix_enabled;
49 int intx_enabled;
50 struct msix_entry *msix_entries;
51 /* Name strings for interrupts. This size should be enough,
52 * and I'm too lazy to allocate each name separately. */
53 char (*msix_names)[256];
54 /* Number of available vectors */
55 unsigned msix_vectors;
Michael S. Tsirkine969fed2009-07-26 15:48:08 +030056 /* Vectors allocated, excluding per-vq vectors if any */
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +030057 unsigned msix_used_vectors;
Amit Shahf0fe6f12011-12-22 16:58:26 +053058
59 /* Status saved during hibernate/restore */
60 u8 saved_status;
61
Michael S. Tsirkine969fed2009-07-26 15:48:08 +030062 /* Whether we have vector per vq */
63 bool per_vq_vectors;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +030064};
65
66/* Constants for MSI-X */
67/* Use first vector for configuration changes, second and the rest for
68 * virtqueues Thus, we need at least 2 vectors for MSI. */
69enum {
70 VP_MSIX_CONFIG_VECTOR = 0,
71 VP_MSIX_VQ_VECTOR = 1,
Anthony Liguori33436602007-11-12 21:30:26 -060072};
73
74struct virtio_pci_vq_info
75{
76 /* the actual virtqueue */
77 struct virtqueue *vq;
78
79 /* the number of entries in the queue */
80 int num;
81
82 /* the index of the queue */
83 int queue_index;
84
85 /* the virtual address of the ring queue */
86 void *queue;
87
88 /* the list node for the virtqueues list */
89 struct list_head node;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +030090
91 /* MSI-X vector (or none) */
Rusty Russellf68d2402009-09-23 22:26:29 -060092 unsigned msix_vector;
Anthony Liguori33436602007-11-12 21:30:26 -060093};
94
95/* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */
96static struct pci_device_id virtio_pci_id_table[] = {
97 { 0x1af4, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
98 { 0 },
99};
100
101MODULE_DEVICE_TABLE(pci, virtio_pci_id_table);
102
Anthony Liguori33436602007-11-12 21:30:26 -0600103/* Convert a generic virtio device to our structure */
104static struct virtio_pci_device *to_vp_device(struct virtio_device *vdev)
105{
106 return container_of(vdev, struct virtio_pci_device, vdev);
107}
108
Rusty Russellc45a6812008-05-02 21:50:50 -0500109/* virtio config->get_features() implementation */
110static u32 vp_get_features(struct virtio_device *vdev)
Anthony Liguori33436602007-11-12 21:30:26 -0600111{
112 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
Anthony Liguori33436602007-11-12 21:30:26 -0600113
Rusty Russellc45a6812008-05-02 21:50:50 -0500114 /* When someone needs more than 32 feature bits, we'll need to
115 * steal a bit to indicate that the rest are somewhere else. */
116 return ioread32(vp_dev->ioaddr + VIRTIO_PCI_HOST_FEATURES);
117}
Anthony Liguori33436602007-11-12 21:30:26 -0600118
Rusty Russellc6248962008-07-25 12:06:07 -0500119/* virtio config->finalize_features() implementation */
120static void vp_finalize_features(struct virtio_device *vdev)
Rusty Russellc45a6812008-05-02 21:50:50 -0500121{
122 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
123
Rusty Russelle34f8722008-07-25 12:06:13 -0500124 /* Give virtio_ring a chance to accept features. */
125 vring_transport_features(vdev);
126
Rusty Russellc6248962008-07-25 12:06:07 -0500127 /* We only support 32 feature bits. */
128 BUILD_BUG_ON(ARRAY_SIZE(vdev->features) != 1);
129 iowrite32(vdev->features[0], vp_dev->ioaddr+VIRTIO_PCI_GUEST_FEATURES);
Anthony Liguori33436602007-11-12 21:30:26 -0600130}
131
132/* virtio config->get() implementation */
133static void vp_get(struct virtio_device *vdev, unsigned offset,
134 void *buf, unsigned len)
135{
136 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300137 void __iomem *ioaddr = vp_dev->ioaddr +
138 VIRTIO_PCI_CONFIG(vp_dev) + offset;
Anthony Liguori33436602007-11-12 21:30:26 -0600139 u8 *ptr = buf;
140 int i;
141
142 for (i = 0; i < len; i++)
143 ptr[i] = ioread8(ioaddr + i);
144}
145
146/* the config->set() implementation. it's symmetric to the config->get()
147 * implementation */
148static void vp_set(struct virtio_device *vdev, unsigned offset,
149 const void *buf, unsigned len)
150{
151 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300152 void __iomem *ioaddr = vp_dev->ioaddr +
153 VIRTIO_PCI_CONFIG(vp_dev) + offset;
Anthony Liguori33436602007-11-12 21:30:26 -0600154 const u8 *ptr = buf;
155 int i;
156
157 for (i = 0; i < len; i++)
158 iowrite8(ptr[i], ioaddr + i);
159}
160
161/* config->{get,set}_status() implementations */
162static u8 vp_get_status(struct virtio_device *vdev)
163{
164 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
165 return ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);
166}
167
168static void vp_set_status(struct virtio_device *vdev, u8 status)
169{
170 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
171 /* We should never be setting status to 0. */
172 BUG_ON(status == 0);
Harvey Harrison597d56e2008-03-31 17:53:55 -0700173 iowrite8(status, vp_dev->ioaddr + VIRTIO_PCI_STATUS);
Anthony Liguori33436602007-11-12 21:30:26 -0600174}
175
Michael S. Tsirkine6af5782011-11-17 17:41:15 +0200176/* wait for pending irq handlers */
177static void vp_synchronize_vectors(struct virtio_device *vdev)
178{
179 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
180 int i;
181
182 if (vp_dev->intx_enabled)
183 synchronize_irq(vp_dev->pci_dev->irq);
184
185 for (i = 0; i < vp_dev->msix_vectors; ++i)
186 synchronize_irq(vp_dev->msix_entries[i].vector);
187}
188
Anthony Liguori33436602007-11-12 21:30:26 -0600189static void vp_reset(struct virtio_device *vdev)
190{
191 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
192 /* 0 status means a reset. */
Harvey Harrison597d56e2008-03-31 17:53:55 -0700193 iowrite8(0, vp_dev->ioaddr + VIRTIO_PCI_STATUS);
Michael S. Tsirkine6af5782011-11-17 17:41:15 +0200194 /* Flush out the status write, and flush in device writes,
195 * including MSi-X interrupts, if any. */
196 ioread8(vp_dev->ioaddr + VIRTIO_PCI_STATUS);
197 /* Flush pending VQ/configuration callbacks. */
198 vp_synchronize_vectors(vdev);
Anthony Liguori33436602007-11-12 21:30:26 -0600199}
200
201/* the notify function used when creating a virt queue */
202static void vp_notify(struct virtqueue *vq)
203{
204 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
205 struct virtio_pci_vq_info *info = vq->priv;
206
207 /* we write the queue's selector into the notification register to
208 * signal the other end */
209 iowrite16(info->queue_index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY);
210}
211
Michael S. Tsirkin77cf52462009-05-14 13:55:31 +0300212/* Handle a configuration change: Tell driver if it wants to know. */
213static irqreturn_t vp_config_changed(int irq, void *opaque)
214{
215 struct virtio_pci_device *vp_dev = opaque;
216 struct virtio_driver *drv;
217 drv = container_of(vp_dev->vdev.dev.driver,
218 struct virtio_driver, driver);
219
220 if (drv && drv->config_changed)
221 drv->config_changed(&vp_dev->vdev);
222 return IRQ_HANDLED;
223}
224
225/* Notify all virtqueues on an interrupt. */
226static irqreturn_t vp_vring_interrupt(int irq, void *opaque)
227{
228 struct virtio_pci_device *vp_dev = opaque;
229 struct virtio_pci_vq_info *info;
230 irqreturn_t ret = IRQ_NONE;
231 unsigned long flags;
232
233 spin_lock_irqsave(&vp_dev->lock, flags);
234 list_for_each_entry(info, &vp_dev->virtqueues, node) {
235 if (vring_interrupt(irq, info->vq) == IRQ_HANDLED)
236 ret = IRQ_HANDLED;
237 }
238 spin_unlock_irqrestore(&vp_dev->lock, flags);
239
240 return ret;
241}
242
Anthony Liguori33436602007-11-12 21:30:26 -0600243/* A small wrapper to also acknowledge the interrupt when it's handled.
244 * I really need an EIO hook for the vring so I can ack the interrupt once we
245 * know that we'll be handling the IRQ but before we invoke the callback since
246 * the callback may notify the host which results in the host attempting to
247 * raise an interrupt that we would then mask once we acknowledged the
248 * interrupt. */
249static irqreturn_t vp_interrupt(int irq, void *opaque)
250{
251 struct virtio_pci_device *vp_dev = opaque;
Anthony Liguori33436602007-11-12 21:30:26 -0600252 u8 isr;
253
254 /* reading the ISR has the effect of also clearing it so it's very
255 * important to save off the value. */
256 isr = ioread8(vp_dev->ioaddr + VIRTIO_PCI_ISR);
257
258 /* It's definitely not us if the ISR was not high */
259 if (!isr)
260 return IRQ_NONE;
261
262 /* Configuration change? Tell driver if it wants to know. */
Michael S. Tsirkin77cf52462009-05-14 13:55:31 +0300263 if (isr & VIRTIO_PCI_ISR_CONFIG)
264 vp_config_changed(irq, opaque);
Anthony Liguori33436602007-11-12 21:30:26 -0600265
Michael S. Tsirkin77cf52462009-05-14 13:55:31 +0300266 return vp_vring_interrupt(irq, opaque);
Anthony Liguori33436602007-11-12 21:30:26 -0600267}
268
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300269static void vp_free_vectors(struct virtio_device *vdev)
270{
271 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
272 int i;
273
274 if (vp_dev->intx_enabled) {
275 free_irq(vp_dev->pci_dev->irq, vp_dev);
276 vp_dev->intx_enabled = 0;
277 }
278
279 for (i = 0; i < vp_dev->msix_used_vectors; ++i)
280 free_irq(vp_dev->msix_entries[i].vector, vp_dev);
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300281
282 if (vp_dev->msix_enabled) {
283 /* Disable the vector used for configuration */
284 iowrite16(VIRTIO_MSI_NO_VECTOR,
285 vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
286 /* Flush the write out to device */
287 ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
288
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300289 pci_disable_msix(vp_dev->pci_dev);
Michael S. Tsirkinff52c3f2009-07-23 14:57:37 +0300290 vp_dev->msix_enabled = 0;
291 vp_dev->msix_vectors = 0;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300292 }
Michael S. Tsirkinff52c3f2009-07-23 14:57:37 +0300293
294 vp_dev->msix_used_vectors = 0;
295 kfree(vp_dev->msix_names);
296 vp_dev->msix_names = NULL;
297 kfree(vp_dev->msix_entries);
298 vp_dev->msix_entries = NULL;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300299}
300
Rusty Russellf68d2402009-09-23 22:26:29 -0600301static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
302 bool per_vq_vectors)
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300303{
304 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
305 const char *name = dev_name(&vp_dev->vdev.dev);
306 unsigned i, v;
307 int err = -ENOMEM;
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300308
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300309 vp_dev->msix_entries = kmalloc(nvectors * sizeof *vp_dev->msix_entries,
310 GFP_KERNEL);
311 if (!vp_dev->msix_entries)
Michael S. Tsirkinff52c3f2009-07-23 14:57:37 +0300312 goto error;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300313 vp_dev->msix_names = kmalloc(nvectors * sizeof *vp_dev->msix_names,
314 GFP_KERNEL);
315 if (!vp_dev->msix_names)
Michael S. Tsirkinff52c3f2009-07-23 14:57:37 +0300316 goto error;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300317
318 for (i = 0; i < nvectors; ++i)
319 vp_dev->msix_entries[i].entry = i;
320
Rusty Russellf68d2402009-09-23 22:26:29 -0600321 /* pci_enable_msix returns positive if we can't get this many. */
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300322 err = pci_enable_msix(vp_dev->pci_dev, vp_dev->msix_entries, nvectors);
323 if (err > 0)
324 err = -ENOSPC;
325 if (err)
326 goto error;
327 vp_dev->msix_vectors = nvectors;
328 vp_dev->msix_enabled = 1;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300329
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300330 /* Set the vector used for configuration */
331 v = vp_dev->msix_used_vectors;
332 snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
333 "%s-config", name);
334 err = request_irq(vp_dev->msix_entries[v].vector,
335 vp_config_changed, 0, vp_dev->msix_names[v],
336 vp_dev);
337 if (err)
338 goto error;
339 ++vp_dev->msix_used_vectors;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300340
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300341 iowrite16(v, vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
342 /* Verify we had enough resources to assign the vector */
343 v = ioread16(vp_dev->ioaddr + VIRTIO_MSI_CONFIG_VECTOR);
344 if (v == VIRTIO_MSI_NO_VECTOR) {
345 err = -EBUSY;
346 goto error;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300347 }
348
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300349 if (!per_vq_vectors) {
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300350 /* Shared vector for all VQs */
351 v = vp_dev->msix_used_vectors;
352 snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
353 "%s-virtqueues", name);
354 err = request_irq(vp_dev->msix_entries[v].vector,
355 vp_vring_interrupt, 0, vp_dev->msix_names[v],
356 vp_dev);
357 if (err)
Michael S. Tsirkinff52c3f2009-07-23 14:57:37 +0300358 goto error;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300359 ++vp_dev->msix_used_vectors;
360 }
361 return 0;
Michael S. Tsirkinff52c3f2009-07-23 14:57:37 +0300362error:
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300363 vp_free_vectors(vdev);
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300364 return err;
365}
366
Rusty Russellf68d2402009-09-23 22:26:29 -0600367static int vp_request_intx(struct virtio_device *vdev)
368{
369 int err;
370 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
371
372 err = request_irq(vp_dev->pci_dev->irq, vp_interrupt,
373 IRQF_SHARED, dev_name(&vdev->dev), vp_dev);
374 if (!err)
375 vp_dev->intx_enabled = 1;
376 return err;
377}
378
379static struct virtqueue *setup_vq(struct virtio_device *vdev, unsigned index,
380 void (*callback)(struct virtqueue *vq),
381 const char *name,
382 u16 msix_vec)
Anthony Liguori33436602007-11-12 21:30:26 -0600383{
384 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
385 struct virtio_pci_vq_info *info;
386 struct virtqueue *vq;
Hollis Blanchard13b1eb32008-12-02 16:24:40 -0600387 unsigned long flags, size;
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300388 u16 num;
Anthony Liguori33436602007-11-12 21:30:26 -0600389 int err;
390
391 /* Select the queue we're interested in */
392 iowrite16(index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
393
394 /* Check if queue is either not available or already active. */
395 num = ioread16(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NUM);
396 if (!num || ioread32(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN))
397 return ERR_PTR(-ENOENT);
398
399 /* allocate and fill out our structure the represents an active
400 * queue */
401 info = kmalloc(sizeof(struct virtio_pci_vq_info), GFP_KERNEL);
402 if (!info)
403 return ERR_PTR(-ENOMEM);
404
405 info->queue_index = index;
406 info->num = num;
Rusty Russellf68d2402009-09-23 22:26:29 -0600407 info->msix_vector = msix_vec;
Anthony Liguori33436602007-11-12 21:30:26 -0600408
Rusty Russell498af142008-12-30 09:25:57 -0600409 size = PAGE_ALIGN(vring_size(num, VIRTIO_PCI_VRING_ALIGN));
Hollis Blanchard13b1eb32008-12-02 16:24:40 -0600410 info->queue = alloc_pages_exact(size, GFP_KERNEL|__GFP_ZERO);
Anthony Liguori33436602007-11-12 21:30:26 -0600411 if (info->queue == NULL) {
412 err = -ENOMEM;
413 goto out_info;
414 }
415
416 /* activate the queue */
Rusty Russell480daab2008-12-30 09:25:56 -0600417 iowrite32(virt_to_phys(info->queue) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT,
Anthony Liguori33436602007-11-12 21:30:26 -0600418 vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
419
420 /* create the vring */
Rusty Russell7b21e342012-01-12 15:44:42 +1030421 vq = vring_new_virtqueue(info->num, VIRTIO_PCI_VRING_ALIGN, vdev,
422 true, info->queue, vp_notify, callback, name);
Anthony Liguori33436602007-11-12 21:30:26 -0600423 if (!vq) {
424 err = -ENOMEM;
425 goto out_activate_queue;
426 }
427
428 vq->priv = info;
429 info->vq = vq;
430
Rusty Russellf68d2402009-09-23 22:26:29 -0600431 if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
432 iowrite16(msix_vec, vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
433 msix_vec = ioread16(vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
434 if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300435 err = -EBUSY;
436 goto out_assign;
437 }
438 }
439
Krishna Kumar005b20a2011-10-05 11:08:59 +0530440 if (callback) {
441 spin_lock_irqsave(&vp_dev->lock, flags);
442 list_add(&info->node, &vp_dev->virtqueues);
443 spin_unlock_irqrestore(&vp_dev->lock, flags);
444 } else {
445 INIT_LIST_HEAD(&info->node);
446 }
Anthony Liguori33436602007-11-12 21:30:26 -0600447
448 return vq;
449
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300450out_assign:
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300451 vring_del_virtqueue(vq);
Anthony Liguori33436602007-11-12 21:30:26 -0600452out_activate_queue:
453 iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
Hollis Blanchard13b1eb32008-12-02 16:24:40 -0600454 free_pages_exact(info->queue, size);
Anthony Liguori33436602007-11-12 21:30:26 -0600455out_info:
456 kfree(info);
457 return ERR_PTR(err);
458}
459
Anthony Liguori33436602007-11-12 21:30:26 -0600460static void vp_del_vq(struct virtqueue *vq)
461{
462 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
463 struct virtio_pci_vq_info *info = vq->priv;
Michael S. Tsirkinf6c82502009-07-26 15:48:01 +0300464 unsigned long flags, size;
465
466 spin_lock_irqsave(&vp_dev->lock, flags);
467 list_del(&info->node);
468 spin_unlock_irqrestore(&vp_dev->lock, flags);
Anthony Liguori33436602007-11-12 21:30:26 -0600469
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300470 iowrite16(info->queue_index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
471
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300472 if (vp_dev->msix_enabled) {
473 iowrite16(VIRTIO_MSI_NO_VECTOR,
474 vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
475 /* Flush the write out to device */
476 ioread8(vp_dev->ioaddr + VIRTIO_PCI_ISR);
477 }
478
Anthony Liguori33436602007-11-12 21:30:26 -0600479 vring_del_virtqueue(vq);
480
481 /* Select and deactivate the queue */
Anthony Liguori33436602007-11-12 21:30:26 -0600482 iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
483
Rusty Russell498af142008-12-30 09:25:57 -0600484 size = PAGE_ALIGN(vring_size(info->num, VIRTIO_PCI_VRING_ALIGN));
Hollis Blanchard13b1eb32008-12-02 16:24:40 -0600485 free_pages_exact(info->queue, size);
Anthony Liguori33436602007-11-12 21:30:26 -0600486 kfree(info);
487}
488
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300489/* the config->del_vqs() implementation */
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600490static void vp_del_vqs(struct virtio_device *vdev)
491{
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300492 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600493 struct virtqueue *vq, *n;
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300494 struct virtio_pci_vq_info *info;
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600495
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300496 list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
497 info = vq->priv;
Michael S. Tsirkin31198152010-02-25 19:08:55 +0200498 if (vp_dev->per_vq_vectors &&
499 info->msix_vector != VIRTIO_MSI_NO_VECTOR)
Rusty Russellf68d2402009-09-23 22:26:29 -0600500 free_irq(vp_dev->msix_entries[info->msix_vector].vector,
501 vq);
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600502 vp_del_vq(vq);
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300503 }
504 vp_dev->per_vq_vectors = false;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300505
506 vp_free_vectors(vdev);
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600507}
508
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300509static int vp_try_to_find_vqs(struct virtio_device *vdev, unsigned nvqs,
510 struct virtqueue *vqs[],
511 vq_callback_t *callbacks[],
512 const char *names[],
Rusty Russellf68d2402009-09-23 22:26:29 -0600513 bool use_msix,
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300514 bool per_vq_vectors)
515{
516 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
Rusty Russellf68d2402009-09-23 22:26:29 -0600517 u16 msix_vec;
518 int i, err, nvectors, allocated_vectors;
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300519
Rusty Russellf68d2402009-09-23 22:26:29 -0600520 if (!use_msix) {
521 /* Old style: one normal interrupt for change and all vqs. */
522 err = vp_request_intx(vdev);
523 if (err)
524 goto error_request;
525 } else {
526 if (per_vq_vectors) {
527 /* Best option: one for change interrupt, one per vq. */
528 nvectors = 1;
529 for (i = 0; i < nvqs; ++i)
530 if (callbacks[i])
531 ++nvectors;
532 } else {
533 /* Second best: one for change, shared for all vqs. */
534 nvectors = 2;
535 }
536
537 err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors);
538 if (err)
539 goto error_request;
540 }
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300541
542 vp_dev->per_vq_vectors = per_vq_vectors;
543 allocated_vectors = vp_dev->msix_used_vectors;
544 for (i = 0; i < nvqs; ++i) {
545 if (!callbacks[i] || !vp_dev->msix_enabled)
Rusty Russellf68d2402009-09-23 22:26:29 -0600546 msix_vec = VIRTIO_MSI_NO_VECTOR;
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300547 else if (vp_dev->per_vq_vectors)
Rusty Russellf68d2402009-09-23 22:26:29 -0600548 msix_vec = allocated_vectors++;
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300549 else
Rusty Russellf68d2402009-09-23 22:26:29 -0600550 msix_vec = VP_MSIX_VQ_VECTOR;
551 vqs[i] = setup_vq(vdev, i, callbacks[i], names[i], msix_vec);
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300552 if (IS_ERR(vqs[i])) {
553 err = PTR_ERR(vqs[i]);
554 goto error_find;
555 }
Michael S. Tsirkin0b22bd02009-10-22 15:06:06 +0200556
557 if (!vp_dev->per_vq_vectors || msix_vec == VIRTIO_MSI_NO_VECTOR)
558 continue;
559
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300560 /* allocate per-vq irq if available and necessary */
Michael S. Tsirkin0b22bd02009-10-22 15:06:06 +0200561 snprintf(vp_dev->msix_names[msix_vec],
562 sizeof *vp_dev->msix_names,
563 "%s-%s",
564 dev_name(&vp_dev->vdev.dev), names[i]);
565 err = request_irq(vp_dev->msix_entries[msix_vec].vector,
566 vring_interrupt, 0,
567 vp_dev->msix_names[msix_vec],
568 vqs[i]);
569 if (err) {
570 vp_del_vq(vqs[i]);
571 goto error_find;
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300572 }
573 }
574 return 0;
575
576error_find:
577 vp_del_vqs(vdev);
578
579error_request:
580 return err;
581}
582
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300583/* the config->find_vqs() implementation */
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600584static int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
585 struct virtqueue *vqs[],
586 vq_callback_t *callbacks[],
587 const char *names[])
588{
Rusty Russellf68d2402009-09-23 22:26:29 -0600589 int err;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300590
Rusty Russellf68d2402009-09-23 22:26:29 -0600591 /* Try MSI-X with one vector per queue. */
592 err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names, true, true);
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300593 if (!err)
594 return 0;
Rusty Russellf68d2402009-09-23 22:26:29 -0600595 /* Fallback: MSI-X with one vector for config, one shared for queues. */
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300596 err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names,
Rusty Russellf68d2402009-09-23 22:26:29 -0600597 true, false);
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300598 if (!err)
599 return 0;
600 /* Finally fall back to regular interrupts. */
Rusty Russellf68d2402009-09-23 22:26:29 -0600601 return vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names,
602 false, false);
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600603}
604
Rick Jones66846042011-11-14 14:17:08 +0000605static const char *vp_bus_name(struct virtio_device *vdev)
606{
607 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
608
609 return pci_name(vp_dev->pci_dev);
610}
611
Anthony Liguori33436602007-11-12 21:30:26 -0600612static struct virtio_config_ops virtio_pci_config_ops = {
Anthony Liguori33436602007-11-12 21:30:26 -0600613 .get = vp_get,
614 .set = vp_set,
615 .get_status = vp_get_status,
616 .set_status = vp_set_status,
617 .reset = vp_reset,
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600618 .find_vqs = vp_find_vqs,
619 .del_vqs = vp_del_vqs,
Rusty Russellc45a6812008-05-02 21:50:50 -0500620 .get_features = vp_get_features,
Rusty Russellc6248962008-07-25 12:06:07 -0500621 .finalize_features = vp_finalize_features,
Rick Jones66846042011-11-14 14:17:08 +0000622 .bus_name = vp_bus_name,
Anthony Liguori33436602007-11-12 21:30:26 -0600623};
624
Mark McLoughlin29f9f122008-12-10 17:45:34 +0000625static void virtio_pci_release_dev(struct device *_d)
626{
Michael S. Tsirkin72103bd2011-11-07 18:37:05 +0200627 /*
628 * No need for a release method as we allocate/free
629 * all devices together with the pci devices.
630 * Provide an empty one to avoid getting a warning from core.
631 */
Mark McLoughlin29f9f122008-12-10 17:45:34 +0000632}
633
Anthony Liguori33436602007-11-12 21:30:26 -0600634/* the PCI probing function */
635static int __devinit virtio_pci_probe(struct pci_dev *pci_dev,
636 const struct pci_device_id *id)
637{
638 struct virtio_pci_device *vp_dev;
639 int err;
640
641 /* We only own devices >= 0x1000 and <= 0x103f: leave the rest. */
642 if (pci_dev->device < 0x1000 || pci_dev->device > 0x103f)
643 return -ENODEV;
644
Anthony Liguori55a7c062008-01-28 09:59:59 -0600645 if (pci_dev->revision != VIRTIO_PCI_ABI_VERSION) {
646 printk(KERN_ERR "virtio_pci: expected ABI version %d, got %d\n",
647 VIRTIO_PCI_ABI_VERSION, pci_dev->revision);
648 return -ENODEV;
649 }
650
Anthony Liguori33436602007-11-12 21:30:26 -0600651 /* allocate our structure and fill it out */
652 vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL);
653 if (vp_dev == NULL)
654 return -ENOMEM;
655
Milton Miller8b3bb3e2011-01-07 02:55:06 -0600656 vp_dev->vdev.dev.parent = &pci_dev->dev;
Mark McLoughlin29f9f122008-12-10 17:45:34 +0000657 vp_dev->vdev.dev.release = virtio_pci_release_dev;
Anthony Liguori33436602007-11-12 21:30:26 -0600658 vp_dev->vdev.config = &virtio_pci_config_ops;
659 vp_dev->pci_dev = pci_dev;
660 INIT_LIST_HEAD(&vp_dev->virtqueues);
661 spin_lock_init(&vp_dev->lock);
662
Michael S. Tsirkinb03214d2010-06-23 22:49:06 -0600663 /* Disable MSI/MSIX to bring device to a known good state. */
664 pci_msi_off(pci_dev);
665
Anthony Liguori33436602007-11-12 21:30:26 -0600666 /* enable the device */
667 err = pci_enable_device(pci_dev);
668 if (err)
669 goto out;
670
671 err = pci_request_regions(pci_dev, "virtio-pci");
672 if (err)
673 goto out_enable_device;
674
675 vp_dev->ioaddr = pci_iomap(pci_dev, 0, 0);
676 if (vp_dev->ioaddr == NULL)
677 goto out_req_regions;
678
679 pci_set_drvdata(pci_dev, vp_dev);
Michael S. Tsirkinbc505f32009-11-29 17:52:00 +0200680 pci_set_master(pci_dev);
Anthony Liguori33436602007-11-12 21:30:26 -0600681
682 /* we use the subsystem vendor/device id as the virtio vendor/device
683 * id. this allows us to use the same PCI vendor/device id for all
684 * virtio devices and to identify the particular virtio driver by
Thomas Weber88393162010-03-16 11:47:56 +0100685 * the subsystem ids */
Anthony Liguori33436602007-11-12 21:30:26 -0600686 vp_dev->vdev.id.vendor = pci_dev->subsystem_vendor;
687 vp_dev->vdev.id.device = pci_dev->subsystem_device;
688
Anthony Liguori33436602007-11-12 21:30:26 -0600689 /* finally register the virtio device */
690 err = register_virtio_device(&vp_dev->vdev);
691 if (err)
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300692 goto out_set_drvdata;
Anthony Liguori33436602007-11-12 21:30:26 -0600693
694 return 0;
695
Anthony Liguori33436602007-11-12 21:30:26 -0600696out_set_drvdata:
697 pci_set_drvdata(pci_dev, NULL);
698 pci_iounmap(pci_dev, vp_dev->ioaddr);
699out_req_regions:
700 pci_release_regions(pci_dev);
701out_enable_device:
702 pci_disable_device(pci_dev);
703out:
704 kfree(vp_dev);
705 return err;
706}
707
708static void __devexit virtio_pci_remove(struct pci_dev *pci_dev)
709{
710 struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
711
Anthony Liguoribd6c2692008-03-19 20:35:04 -0500712 unregister_virtio_device(&vp_dev->vdev);
Amit Shah31a3ddd2011-03-14 17:45:02 +0530713
714 vp_del_vqs(&vp_dev->vdev);
715 pci_set_drvdata(pci_dev, NULL);
716 pci_iounmap(pci_dev, vp_dev->ioaddr);
717 pci_release_regions(pci_dev);
718 pci_disable_device(pci_dev);
Michael S. Tsirkin72103bd2011-11-07 18:37:05 +0200719 kfree(vp_dev);
Anthony Liguori33436602007-11-12 21:30:26 -0600720}
721
722#ifdef CONFIG_PM
Amit Shahd0775362011-12-22 16:58:25 +0530723static int virtio_pci_suspend(struct device *dev)
Anthony Liguori33436602007-11-12 21:30:26 -0600724{
Amit Shahd0775362011-12-22 16:58:25 +0530725 struct pci_dev *pci_dev = to_pci_dev(dev);
726
Anthony Liguori33436602007-11-12 21:30:26 -0600727 pci_save_state(pci_dev);
728 pci_set_power_state(pci_dev, PCI_D3hot);
729 return 0;
730}
731
Amit Shahd0775362011-12-22 16:58:25 +0530732static int virtio_pci_resume(struct device *dev)
Anthony Liguori33436602007-11-12 21:30:26 -0600733{
Amit Shahd0775362011-12-22 16:58:25 +0530734 struct pci_dev *pci_dev = to_pci_dev(dev);
735
Anthony Liguori33436602007-11-12 21:30:26 -0600736 pci_restore_state(pci_dev);
737 pci_set_power_state(pci_dev, PCI_D0);
738 return 0;
739}
Amit Shahd0775362011-12-22 16:58:25 +0530740
Amit Shahf0fe6f12011-12-22 16:58:26 +0530741static int virtio_pci_freeze(struct device *dev)
742{
743 struct pci_dev *pci_dev = to_pci_dev(dev);
744 struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
745 struct virtio_driver *drv;
746 int ret;
747
748 drv = container_of(vp_dev->vdev.dev.driver,
749 struct virtio_driver, driver);
750
751 ret = 0;
752 vp_dev->saved_status = vp_get_status(&vp_dev->vdev);
753 if (drv && drv->freeze)
754 ret = drv->freeze(&vp_dev->vdev);
755
756 if (!ret)
757 pci_disable_device(pci_dev);
758 return ret;
759}
760
761static int restore_common(struct device *dev)
762{
763 struct pci_dev *pci_dev = to_pci_dev(dev);
764 struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
765 int ret;
766
767 ret = pci_enable_device(pci_dev);
768 if (ret)
769 return ret;
770 pci_set_master(pci_dev);
771 vp_finalize_features(&vp_dev->vdev);
772
773 return ret;
774}
775
776static int virtio_pci_thaw(struct device *dev)
777{
778 struct pci_dev *pci_dev = to_pci_dev(dev);
779 struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
780 struct virtio_driver *drv;
781 int ret;
782
783 ret = restore_common(dev);
784 if (ret)
785 return ret;
786
787 drv = container_of(vp_dev->vdev.dev.driver,
788 struct virtio_driver, driver);
789
790 if (drv && drv->thaw)
791 ret = drv->thaw(&vp_dev->vdev);
792 else if (drv && drv->restore)
793 ret = drv->restore(&vp_dev->vdev);
794
795 /* Finally, tell the device we're all set */
796 if (!ret)
797 vp_set_status(&vp_dev->vdev, vp_dev->saved_status);
798
799 return ret;
800}
801
802static int virtio_pci_restore(struct device *dev)
803{
804 struct pci_dev *pci_dev = to_pci_dev(dev);
805 struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
806 struct virtio_driver *drv;
807 int ret;
808
809 drv = container_of(vp_dev->vdev.dev.driver,
810 struct virtio_driver, driver);
811
812 ret = restore_common(dev);
813 if (!ret && drv && drv->restore)
814 ret = drv->restore(&vp_dev->vdev);
815
816 /* Finally, tell the device we're all set */
817 if (!ret)
818 vp_set_status(&vp_dev->vdev, vp_dev->saved_status);
819
820 return ret;
821}
822
Amit Shahd0775362011-12-22 16:58:25 +0530823static const struct dev_pm_ops virtio_pci_pm_ops = {
Amit Shahf0fe6f12011-12-22 16:58:26 +0530824 .suspend = virtio_pci_suspend,
825 .resume = virtio_pci_resume,
826 .freeze = virtio_pci_freeze,
827 .thaw = virtio_pci_thaw,
828 .restore = virtio_pci_restore,
829 .poweroff = virtio_pci_suspend,
Amit Shahd0775362011-12-22 16:58:25 +0530830};
Anthony Liguori33436602007-11-12 21:30:26 -0600831#endif
832
833static struct pci_driver virtio_pci_driver = {
834 .name = "virtio-pci",
835 .id_table = virtio_pci_id_table,
836 .probe = virtio_pci_probe,
Jamie Lokier1f08b832010-01-08 22:01:43 +0000837 .remove = __devexit_p(virtio_pci_remove),
Anthony Liguori33436602007-11-12 21:30:26 -0600838#ifdef CONFIG_PM
Amit Shahd0775362011-12-22 16:58:25 +0530839 .driver.pm = &virtio_pci_pm_ops,
Anthony Liguori33436602007-11-12 21:30:26 -0600840#endif
841};
842
843static int __init virtio_pci_init(void)
844{
Milton Miller8b3bb3e2011-01-07 02:55:06 -0600845 return pci_register_driver(&virtio_pci_driver);
Anthony Liguori33436602007-11-12 21:30:26 -0600846}
847
848module_init(virtio_pci_init);
849
850static void __exit virtio_pci_exit(void)
851{
Anthony Liguori33436602007-11-12 21:30:26 -0600852 pci_unregister_driver(&virtio_pci_driver);
Anthony Liguori33436602007-11-12 21:30:26 -0600853}
854
855module_exit(virtio_pci_exit);