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1/*
2 * Virtio PCI driver - modern (virtio 1.0) device support
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 * Copyright Red Hat, Inc. 2014
9 *
10 * Authors:
11 * Anthony Liguori <aliguori@us.ibm.com>
12 * Rusty Russell <rusty@rustcorp.com.au>
13 * Michael S. Tsirkin <mst@redhat.com>
14 *
15 * This work is licensed under the terms of the GNU GPL, version 2 or later.
16 * See the COPYING file in the top-level directory.
17 *
18 */
19
20#include <linux/delay.h>
21#define VIRTIO_PCI_NO_LEGACY
22#include "virtio_pci_common.h"
23
24/*
25 * Type-safe wrappers for io accesses.
26 * Use these to enforce at compile time the following spec requirement:
27 *
28 * The driver MUST access each field using the “natural” access
29 * method, i.e. 32-bit accesses for 32-bit fields, 16-bit accesses
30 * for 16-bit fields and 8-bit accesses for 8-bit fields.
31 */
32static inline u8 vp_ioread8(u8 __iomem *addr)
33{
34 return ioread8(addr);
35}
36static inline u16 vp_ioread16 (u16 __iomem *addr)
37{
38 return ioread16(addr);
39}
40
41static inline u32 vp_ioread32(u32 __iomem *addr)
42{
43 return ioread32(addr);
44}
45
46static inline void vp_iowrite8(u8 value, u8 __iomem *addr)
47{
48 iowrite8(value, addr);
49}
50
51static inline void vp_iowrite16(u16 value, u16 __iomem *addr)
52{
53 iowrite16(value, addr);
54}
55
56static inline void vp_iowrite32(u32 value, u32 __iomem *addr)
57{
58 iowrite32(value, addr);
59}
60
61static void vp_iowrite64_twopart(u64 val,
62 __le32 __iomem *lo, __le32 __iomem *hi)
63{
64 vp_iowrite32((u32)val, lo);
65 vp_iowrite32(val >> 32, hi);
66}
67
68static void __iomem *map_capability(struct pci_dev *dev, int off,
69 size_t minlen,
70 u32 align,
71 u32 start, u32 size,
72 size_t *len)
73{
74 u8 bar;
75 u32 offset, length;
76 void __iomem *p;
77
78 pci_read_config_byte(dev, off + offsetof(struct virtio_pci_cap,
79 bar),
80 &bar);
81 pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, offset),
82 &offset);
83 pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, length),
84 &length);
85
86 if (length <= start) {
87 dev_err(&dev->dev,
88 "virtio_pci: bad capability len %u (>%u expected)\n",
89 length, start);
90 return NULL;
91 }
92
93 if (length - start < minlen) {
94 dev_err(&dev->dev,
95 "virtio_pci: bad capability len %u (>=%zu expected)\n",
96 length, minlen);
97 return NULL;
98 }
99
100 length -= start;
101
102 if (start + offset < offset) {
103 dev_err(&dev->dev,
104 "virtio_pci: map wrap-around %u+%u\n",
105 start, offset);
106 return NULL;
107 }
108
109 offset += start;
110
111 if (offset & (align - 1)) {
112 dev_err(&dev->dev,
113 "virtio_pci: offset %u not aligned to %u\n",
114 offset, align);
115 return NULL;
116 }
117
118 if (length > size)
119 length = size;
120
121 if (len)
122 *len = length;
123
124 if (minlen + offset < minlen ||
125 minlen + offset > pci_resource_len(dev, bar)) {
126 dev_err(&dev->dev,
127 "virtio_pci: map virtio %zu@%u "
128 "out of range on bar %i length %lu\n",
129 minlen, offset,
130 bar, (unsigned long)pci_resource_len(dev, bar));
131 return NULL;
132 }
133
134 p = pci_iomap_range(dev, bar, offset, length);
135 if (!p)
136 dev_err(&dev->dev,
137 "virtio_pci: unable to map virtio %u@%u on bar %i\n",
138 length, offset, bar);
139 return p;
140}
141
142/* virtio config->get_features() implementation */
143static u64 vp_get_features(struct virtio_device *vdev)
144{
145 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
146 u64 features;
147
148 vp_iowrite32(0, &vp_dev->common->device_feature_select);
149 features = vp_ioread32(&vp_dev->common->device_feature);
150 vp_iowrite32(1, &vp_dev->common->device_feature_select);
151 features |= ((u64)vp_ioread32(&vp_dev->common->device_feature) << 32);
152
153 return features;
154}
155
156/* virtio config->finalize_features() implementation */
157static int vp_finalize_features(struct virtio_device *vdev)
158{
159 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
160
161 /* Give virtio_ring a chance to accept features. */
162 vring_transport_features(vdev);
163
164 if (!__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
165 dev_err(&vdev->dev, "virtio: device uses modern interface "
166 "but does not have VIRTIO_F_VERSION_1\n");
167 return -EINVAL;
168 }
169
170 vp_iowrite32(0, &vp_dev->common->guest_feature_select);
171 vp_iowrite32((u32)vdev->features, &vp_dev->common->guest_feature);
172 vp_iowrite32(1, &vp_dev->common->guest_feature_select);
173 vp_iowrite32(vdev->features >> 32, &vp_dev->common->guest_feature);
174
175 return 0;
176}
177
178/* virtio config->get() implementation */
179static void vp_get(struct virtio_device *vdev, unsigned offset,
180 void *buf, unsigned len)
181{
182 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
183 u8 b;
184 __le16 w;
185 __le32 l;
186
187 BUG_ON(offset + len > vp_dev->device_len);
188
189 switch (len) {
190 case 1:
191 b = ioread8(vp_dev->device + offset);
192 memcpy(buf, &b, sizeof b);
193 break;
194 case 2:
195 w = cpu_to_le16(ioread16(vp_dev->device + offset));
196 memcpy(buf, &w, sizeof w);
197 break;
198 case 4:
199 l = cpu_to_le32(ioread32(vp_dev->device + offset));
200 memcpy(buf, &l, sizeof l);
201 break;
202 case 8:
203 l = cpu_to_le32(ioread32(vp_dev->device + offset));
204 memcpy(buf, &l, sizeof l);
205 l = cpu_to_le32(ioread32(vp_dev->device + offset + sizeof l));
206 memcpy(buf + sizeof l, &l, sizeof l);
207 break;
208 default:
209 BUG();
210 }
211}
212
213/* the config->set() implementation. it's symmetric to the config->get()
214 * implementation */
215static void vp_set(struct virtio_device *vdev, unsigned offset,
216 const void *buf, unsigned len)
217{
218 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
219 u8 b;
220 __le16 w;
221 __le32 l;
222
223 BUG_ON(offset + len > vp_dev->device_len);
224
225 switch (len) {
226 case 1:
227 memcpy(&b, buf, sizeof b);
228 iowrite8(b, vp_dev->device + offset);
229 break;
230 case 2:
231 memcpy(&w, buf, sizeof w);
232 iowrite16(le16_to_cpu(w), vp_dev->device + offset);
233 break;
234 case 4:
235 memcpy(&l, buf, sizeof l);
236 iowrite32(le32_to_cpu(l), vp_dev->device + offset);
237 break;
238 case 8:
239 memcpy(&l, buf, sizeof l);
240 iowrite32(le32_to_cpu(l), vp_dev->device + offset);
241 memcpy(&l, buf + sizeof l, sizeof l);
242 iowrite32(le32_to_cpu(l), vp_dev->device + offset + sizeof l);
243 break;
244 default:
245 BUG();
246 }
247}
248
249static u32 vp_generation(struct virtio_device *vdev)
250{
251 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
252 return vp_ioread8(&vp_dev->common->config_generation);
253}
254
255/* config->{get,set}_status() implementations */
256static u8 vp_get_status(struct virtio_device *vdev)
257{
258 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
259 return vp_ioread8(&vp_dev->common->device_status);
260}
261
262static void vp_set_status(struct virtio_device *vdev, u8 status)
263{
264 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
265 /* We should never be setting status to 0. */
266 BUG_ON(status == 0);
267 vp_iowrite8(status, &vp_dev->common->device_status);
268}
269
270static void vp_reset(struct virtio_device *vdev)
271{
272 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
273 /* 0 status means a reset. */
274 vp_iowrite8(0, &vp_dev->common->device_status);
275 /* After writing 0 to device_status, the driver MUST wait for a read of
276 * device_status to return 0 before reinitializing the device.
277 * This will flush out the status write, and flush in device writes,
278 * including MSI-X interrupts, if any.
279 */
280 while (vp_ioread8(&vp_dev->common->device_status))
281 msleep(1);
282 /* Flush pending VQ/configuration callbacks. */
283 vp_synchronize_vectors(vdev);
284}
285
286static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
287{
288 /* Setup the vector used for configuration events */
289 vp_iowrite16(vector, &vp_dev->common->msix_config);
290 /* Verify we had enough resources to assign the vector */
291 /* Will also flush the write out to device */
292 return vp_ioread16(&vp_dev->common->msix_config);
293}
294
295static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
296 struct virtio_pci_vq_info *info,
297 unsigned index,
298 void (*callback)(struct virtqueue *vq),
299 const char *name,
300 u16 msix_vec)
301{
302 struct virtio_pci_common_cfg __iomem *cfg = vp_dev->common;
303 struct virtqueue *vq;
304 u16 num, off;
305 int err;
306
307 if (index >= vp_ioread16(&cfg->num_queues))
308 return ERR_PTR(-ENOENT);
309
310 /* Select the queue we're interested in */
311 vp_iowrite16(index, &cfg->queue_select);
312
313 /* Check if queue is either not available or already active. */
314 num = vp_ioread16(&cfg->queue_size);
315 if (!num || vp_ioread16(&cfg->queue_enable))
316 return ERR_PTR(-ENOENT);
317
318 if (num & (num - 1)) {
319 dev_warn(&vp_dev->pci_dev->dev, "bad queue size %u", num);
320 return ERR_PTR(-EINVAL);
321 }
322
323 /* get offset of notification word for this vq */
324 off = vp_ioread16(&cfg->queue_notify_off);
325
326 info->msix_vector = msix_vec;
327
328 /* create the vring */
329 vq = vring_create_virtqueue(index, num,
330 SMP_CACHE_BYTES, &vp_dev->vdev,
331 true, true, vp_notify, callback, name);
332 if (!vq)
333 return ERR_PTR(-ENOMEM);
334
335 /* activate the queue */
336 vp_iowrite16(virtqueue_get_vring_size(vq), &cfg->queue_size);
337 vp_iowrite64_twopart(virtqueue_get_desc_addr(vq),
338 &cfg->queue_desc_lo, &cfg->queue_desc_hi);
339 vp_iowrite64_twopart(virtqueue_get_avail_addr(vq),
340 &cfg->queue_avail_lo, &cfg->queue_avail_hi);
341 vp_iowrite64_twopart(virtqueue_get_used_addr(vq),
342 &cfg->queue_used_lo, &cfg->queue_used_hi);
343
344 if (vp_dev->notify_base) {
345 /* offset should not wrap */
346 if ((u64)off * vp_dev->notify_offset_multiplier + 2
347 > vp_dev->notify_len) {
348 dev_warn(&vp_dev->pci_dev->dev,
349 "bad notification offset %u (x %u) "
350 "for queue %u > %zd",
351 off, vp_dev->notify_offset_multiplier,
352 index, vp_dev->notify_len);
353 err = -EINVAL;
354 goto err_map_notify;
355 }
356 vq->priv = (void __force *)vp_dev->notify_base +
357 off * vp_dev->notify_offset_multiplier;
358 } else {
359 vq->priv = (void __force *)map_capability(vp_dev->pci_dev,
360 vp_dev->notify_map_cap, 2, 2,
361 off * vp_dev->notify_offset_multiplier, 2,
362 NULL);
363 }
364
365 if (!vq->priv) {
366 err = -ENOMEM;
367 goto err_map_notify;
368 }
369
370 if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
371 vp_iowrite16(msix_vec, &cfg->queue_msix_vector);
372 msix_vec = vp_ioread16(&cfg->queue_msix_vector);
373 if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
374 err = -EBUSY;
375 goto err_assign_vector;
376 }
377 }
378
379 return vq;
380
381err_assign_vector:
382 if (!vp_dev->notify_base)
383 pci_iounmap(vp_dev->pci_dev, (void __iomem __force *)vq->priv);
384err_map_notify:
385 vring_del_virtqueue(vq);
386 return ERR_PTR(err);
387}
388
389static int vp_modern_find_vqs(struct virtio_device *vdev, unsigned nvqs,
390 struct virtqueue *vqs[],
391 vq_callback_t *callbacks[],
392 const char * const names[])
393{
394 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
395 struct virtqueue *vq;
396 int rc = vp_find_vqs(vdev, nvqs, vqs, callbacks, names);
397
398 if (rc)
399 return rc;
400
401 /* Select and activate all queues. Has to be done last: once we do
402 * this, there's no way to go back except reset.
403 */
404 list_for_each_entry(vq, &vdev->vqs, list) {
405 vp_iowrite16(vq->index, &vp_dev->common->queue_select);
406 vp_iowrite16(1, &vp_dev->common->queue_enable);
407 }
408
409 return 0;
410}
411
412static void del_vq(struct virtio_pci_vq_info *info)
413{
414 struct virtqueue *vq = info->vq;
415 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
416
417 vp_iowrite16(vq->index, &vp_dev->common->queue_select);
418
419 if (vp_dev->msix_enabled) {
420 vp_iowrite16(VIRTIO_MSI_NO_VECTOR,
421 &vp_dev->common->queue_msix_vector);
422 /* Flush the write out to device */
423 vp_ioread16(&vp_dev->common->queue_msix_vector);
424 }
425
426 if (!vp_dev->notify_base)
427 pci_iounmap(vp_dev->pci_dev, (void __force __iomem *)vq->priv);
428
429 vring_del_virtqueue(vq);
430}
431
432static const struct virtio_config_ops virtio_pci_config_nodev_ops = {
433 .get = NULL,
434 .set = NULL,
435 .generation = vp_generation,
436 .get_status = vp_get_status,
437 .set_status = vp_set_status,
438 .reset = vp_reset,
439 .find_vqs = vp_modern_find_vqs,
440 .del_vqs = vp_del_vqs,
441 .get_features = vp_get_features,
442 .finalize_features = vp_finalize_features,
443 .bus_name = vp_bus_name,
444 .set_vq_affinity = vp_set_vq_affinity,
445};
446
447static const struct virtio_config_ops virtio_pci_config_ops = {
448 .get = vp_get,
449 .set = vp_set,
450 .generation = vp_generation,
451 .get_status = vp_get_status,
452 .set_status = vp_set_status,
453 .reset = vp_reset,
454 .find_vqs = vp_modern_find_vqs,
455 .del_vqs = vp_del_vqs,
456 .get_features = vp_get_features,
457 .finalize_features = vp_finalize_features,
458 .bus_name = vp_bus_name,
459 .set_vq_affinity = vp_set_vq_affinity,
460};
461
462/**
463 * virtio_pci_find_capability - walk capabilities to find device info.
464 * @dev: the pci device
465 * @cfg_type: the VIRTIO_PCI_CAP_* value we seek
466 * @ioresource_types: IORESOURCE_MEM and/or IORESOURCE_IO.
467 *
468 * Returns offset of the capability, or 0.
469 */
470static inline int virtio_pci_find_capability(struct pci_dev *dev, u8 cfg_type,
471 u32 ioresource_types, int *bars)
472{
473 int pos;
474
475 for (pos = pci_find_capability(dev, PCI_CAP_ID_VNDR);
476 pos > 0;
477 pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_VNDR)) {
478 u8 type, bar;
479 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
480 cfg_type),
481 &type);
482 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
483 bar),
484 &bar);
485
486 /* Ignore structures with reserved BAR values */
487 if (bar > 0x5)
488 continue;
489
490 if (type == cfg_type) {
491 if (pci_resource_len(dev, bar) &&
492 pci_resource_flags(dev, bar) & ioresource_types) {
493 *bars |= (1 << bar);
494 return pos;
495 }
496 }
497 }
498 return 0;
499}
500
501/* This is part of the ABI. Don't screw with it. */
502static inline void check_offsets(void)
503{
504 /* Note: disk space was harmed in compilation of this function. */
505 BUILD_BUG_ON(VIRTIO_PCI_CAP_VNDR !=
506 offsetof(struct virtio_pci_cap, cap_vndr));
507 BUILD_BUG_ON(VIRTIO_PCI_CAP_NEXT !=
508 offsetof(struct virtio_pci_cap, cap_next));
509 BUILD_BUG_ON(VIRTIO_PCI_CAP_LEN !=
510 offsetof(struct virtio_pci_cap, cap_len));
511 BUILD_BUG_ON(VIRTIO_PCI_CAP_CFG_TYPE !=
512 offsetof(struct virtio_pci_cap, cfg_type));
513 BUILD_BUG_ON(VIRTIO_PCI_CAP_BAR !=
514 offsetof(struct virtio_pci_cap, bar));
515 BUILD_BUG_ON(VIRTIO_PCI_CAP_OFFSET !=
516 offsetof(struct virtio_pci_cap, offset));
517 BUILD_BUG_ON(VIRTIO_PCI_CAP_LENGTH !=
518 offsetof(struct virtio_pci_cap, length));
519 BUILD_BUG_ON(VIRTIO_PCI_NOTIFY_CAP_MULT !=
520 offsetof(struct virtio_pci_notify_cap,
521 notify_off_multiplier));
522 BUILD_BUG_ON(VIRTIO_PCI_COMMON_DFSELECT !=
523 offsetof(struct virtio_pci_common_cfg,
524 device_feature_select));
525 BUILD_BUG_ON(VIRTIO_PCI_COMMON_DF !=
526 offsetof(struct virtio_pci_common_cfg, device_feature));
527 BUILD_BUG_ON(VIRTIO_PCI_COMMON_GFSELECT !=
528 offsetof(struct virtio_pci_common_cfg,
529 guest_feature_select));
530 BUILD_BUG_ON(VIRTIO_PCI_COMMON_GF !=
531 offsetof(struct virtio_pci_common_cfg, guest_feature));
532 BUILD_BUG_ON(VIRTIO_PCI_COMMON_MSIX !=
533 offsetof(struct virtio_pci_common_cfg, msix_config));
534 BUILD_BUG_ON(VIRTIO_PCI_COMMON_NUMQ !=
535 offsetof(struct virtio_pci_common_cfg, num_queues));
536 BUILD_BUG_ON(VIRTIO_PCI_COMMON_STATUS !=
537 offsetof(struct virtio_pci_common_cfg, device_status));
538 BUILD_BUG_ON(VIRTIO_PCI_COMMON_CFGGENERATION !=
539 offsetof(struct virtio_pci_common_cfg, config_generation));
540 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SELECT !=
541 offsetof(struct virtio_pci_common_cfg, queue_select));
542 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SIZE !=
543 offsetof(struct virtio_pci_common_cfg, queue_size));
544 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_MSIX !=
545 offsetof(struct virtio_pci_common_cfg, queue_msix_vector));
546 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_ENABLE !=
547 offsetof(struct virtio_pci_common_cfg, queue_enable));
548 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_NOFF !=
549 offsetof(struct virtio_pci_common_cfg, queue_notify_off));
550 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCLO !=
551 offsetof(struct virtio_pci_common_cfg, queue_desc_lo));
552 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCHI !=
553 offsetof(struct virtio_pci_common_cfg, queue_desc_hi));
554 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILLO !=
555 offsetof(struct virtio_pci_common_cfg, queue_avail_lo));
556 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILHI !=
557 offsetof(struct virtio_pci_common_cfg, queue_avail_hi));
558 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDLO !=
559 offsetof(struct virtio_pci_common_cfg, queue_used_lo));
560 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDHI !=
561 offsetof(struct virtio_pci_common_cfg, queue_used_hi));
562}
563
564/* the PCI probing function */
565int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev)
566{
567 struct pci_dev *pci_dev = vp_dev->pci_dev;
568 int err, common, isr, notify, device;
569 u32 notify_length;
570 u32 notify_offset;
571
572 check_offsets();
573
574 /* We only own devices >= 0x1000 and <= 0x107f: leave the rest. */
575 if (pci_dev->device < 0x1000 || pci_dev->device > 0x107f)
576 return -ENODEV;
577
578 if (pci_dev->device < 0x1040) {
579 /* Transitional devices: use the PCI subsystem device id as
580 * virtio device id, same as legacy driver always did.
581 */
582 vp_dev->vdev.id.device = pci_dev->subsystem_device;
583 } else {
584 /* Modern devices: simply use PCI device id, but start from 0x1040. */
585 vp_dev->vdev.id.device = pci_dev->device - 0x1040;
586 }
587 vp_dev->vdev.id.vendor = pci_dev->subsystem_vendor;
588
589 /* check for a common config: if not, use legacy mode (bar 0). */
590 common = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_COMMON_CFG,
591 IORESOURCE_IO | IORESOURCE_MEM,
592 &vp_dev->modern_bars);
593 if (!common) {
594 dev_info(&pci_dev->dev,
595 "virtio_pci: leaving for legacy driver\n");
596 return -ENODEV;
597 }
598
599 /* If common is there, these should be too... */
600 isr = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_ISR_CFG,
601 IORESOURCE_IO | IORESOURCE_MEM,
602 &vp_dev->modern_bars);
603 notify = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_NOTIFY_CFG,
604 IORESOURCE_IO | IORESOURCE_MEM,
605 &vp_dev->modern_bars);
606 if (!isr || !notify) {
607 dev_err(&pci_dev->dev,
608 "virtio_pci: missing capabilities %i/%i/%i\n",
609 common, isr, notify);
610 return -EINVAL;
611 }
612
613 err = dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(64));
614 if (err)
615 err = dma_set_mask_and_coherent(&pci_dev->dev,
616 DMA_BIT_MASK(32));
617 if (err)
618 dev_warn(&pci_dev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n");
619
620 /* Device capability is only mandatory for devices that have
621 * device-specific configuration.
622 */
623 device = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_DEVICE_CFG,
624 IORESOURCE_IO | IORESOURCE_MEM,
625 &vp_dev->modern_bars);
626
627 err = pci_request_selected_regions(pci_dev, vp_dev->modern_bars,
628 "virtio-pci-modern");
629 if (err)
630 return err;
631
632 err = -EINVAL;
633 vp_dev->common = map_capability(pci_dev, common,
634 sizeof(struct virtio_pci_common_cfg), 4,
635 0, sizeof(struct virtio_pci_common_cfg),
636 NULL);
637 if (!vp_dev->common)
638 goto err_map_common;
639 vp_dev->isr = map_capability(pci_dev, isr, sizeof(u8), 1,
640 0, 1,
641 NULL);
642 if (!vp_dev->isr)
643 goto err_map_isr;
644
645 /* Read notify_off_multiplier from config space. */
646 pci_read_config_dword(pci_dev,
647 notify + offsetof(struct virtio_pci_notify_cap,
648 notify_off_multiplier),
649 &vp_dev->notify_offset_multiplier);
650 /* Read notify length and offset from config space. */
651 pci_read_config_dword(pci_dev,
652 notify + offsetof(struct virtio_pci_notify_cap,
653 cap.length),
654 ¬ify_length);
655
656 pci_read_config_dword(pci_dev,
657 notify + offsetof(struct virtio_pci_notify_cap,
658 cap.offset),
659 ¬ify_offset);
660
661 /* We don't know how many VQs we'll map, ahead of the time.
662 * If notify length is small, map it all now.
663 * Otherwise, map each VQ individually later.
664 */
665 if ((u64)notify_length + (notify_offset % PAGE_SIZE) <= PAGE_SIZE) {
666 vp_dev->notify_base = map_capability(pci_dev, notify, 2, 2,
667 0, notify_length,
668 &vp_dev->notify_len);
669 if (!vp_dev->notify_base)
670 goto err_map_notify;
671 } else {
672 vp_dev->notify_map_cap = notify;
673 }
674
675 /* Again, we don't know how much we should map, but PAGE_SIZE
676 * is more than enough for all existing devices.
677 */
678 if (device) {
679 vp_dev->device = map_capability(pci_dev, device, 0, 4,
680 0, PAGE_SIZE,
681 &vp_dev->device_len);
682 if (!vp_dev->device)
683 goto err_map_device;
684
685 vp_dev->vdev.config = &virtio_pci_config_ops;
686 } else {
687 vp_dev->vdev.config = &virtio_pci_config_nodev_ops;
688 }
689
690 vp_dev->config_vector = vp_config_vector;
691 vp_dev->setup_vq = setup_vq;
692 vp_dev->del_vq = del_vq;
693
694 return 0;
695
696err_map_device:
697 if (vp_dev->notify_base)
698 pci_iounmap(pci_dev, vp_dev->notify_base);
699err_map_notify:
700 pci_iounmap(pci_dev, vp_dev->isr);
701err_map_isr:
702 pci_iounmap(pci_dev, vp_dev->common);
703err_map_common:
704 return err;
705}
706
707void virtio_pci_modern_remove(struct virtio_pci_device *vp_dev)
708{
709 struct pci_dev *pci_dev = vp_dev->pci_dev;
710
711 if (vp_dev->device)
712 pci_iounmap(pci_dev, vp_dev->device);
713 if (vp_dev->notify_base)
714 pci_iounmap(pci_dev, vp_dev->notify_base);
715 pci_iounmap(pci_dev, vp_dev->isr);
716 pci_iounmap(pci_dev, vp_dev->common);
717 pci_release_selected_regions(pci_dev, vp_dev->modern_bars);
718}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Virtio PCI driver - modern (virtio 1.0) device support
4 *
5 * This module allows virtio devices to be used over a virtual PCI device.
6 * This can be used with QEMU based VMMs like KVM or Xen.
7 *
8 * Copyright IBM Corp. 2007
9 * Copyright Red Hat, Inc. 2014
10 *
11 * Authors:
12 * Anthony Liguori <aliguori@us.ibm.com>
13 * Rusty Russell <rusty@rustcorp.com.au>
14 * Michael S. Tsirkin <mst@redhat.com>
15 */
16
17#include <linux/delay.h>
18#define VIRTIO_PCI_NO_LEGACY
19#define VIRTIO_RING_NO_LEGACY
20#include "virtio_pci_common.h"
21
22#define VIRTIO_AVQ_SGS_MAX 4
23
24static u64 vp_get_features(struct virtio_device *vdev)
25{
26 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
27
28 return vp_modern_get_features(&vp_dev->mdev);
29}
30
31static bool vp_is_avq(struct virtio_device *vdev, unsigned int index)
32{
33 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
34
35 if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ))
36 return false;
37
38 return index == vp_dev->admin_vq.vq_index;
39}
40
41static int virtqueue_exec_admin_cmd(struct virtio_pci_admin_vq *admin_vq,
42 u16 opcode,
43 struct scatterlist **sgs,
44 unsigned int out_num,
45 unsigned int in_num,
46 void *data)
47{
48 struct virtqueue *vq;
49 int ret, len;
50
51 vq = admin_vq->info.vq;
52 if (!vq)
53 return -EIO;
54
55 if (opcode != VIRTIO_ADMIN_CMD_LIST_QUERY &&
56 opcode != VIRTIO_ADMIN_CMD_LIST_USE &&
57 !((1ULL << opcode) & admin_vq->supported_cmds))
58 return -EOPNOTSUPP;
59
60 ret = virtqueue_add_sgs(vq, sgs, out_num, in_num, data, GFP_KERNEL);
61 if (ret < 0)
62 return -EIO;
63
64 if (unlikely(!virtqueue_kick(vq)))
65 return -EIO;
66
67 while (!virtqueue_get_buf(vq, &len) &&
68 !virtqueue_is_broken(vq))
69 cpu_relax();
70
71 if (virtqueue_is_broken(vq))
72 return -EIO;
73
74 return 0;
75}
76
77int vp_modern_admin_cmd_exec(struct virtio_device *vdev,
78 struct virtio_admin_cmd *cmd)
79{
80 struct scatterlist *sgs[VIRTIO_AVQ_SGS_MAX], hdr, stat;
81 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
82 struct virtio_admin_cmd_status *va_status;
83 unsigned int out_num = 0, in_num = 0;
84 struct virtio_admin_cmd_hdr *va_hdr;
85 u16 status;
86 int ret;
87
88 if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ))
89 return -EOPNOTSUPP;
90
91 va_status = kzalloc(sizeof(*va_status), GFP_KERNEL);
92 if (!va_status)
93 return -ENOMEM;
94
95 va_hdr = kzalloc(sizeof(*va_hdr), GFP_KERNEL);
96 if (!va_hdr) {
97 ret = -ENOMEM;
98 goto err_alloc;
99 }
100
101 va_hdr->opcode = cmd->opcode;
102 va_hdr->group_type = cmd->group_type;
103 va_hdr->group_member_id = cmd->group_member_id;
104
105 /* Add header */
106 sg_init_one(&hdr, va_hdr, sizeof(*va_hdr));
107 sgs[out_num] = &hdr;
108 out_num++;
109
110 if (cmd->data_sg) {
111 sgs[out_num] = cmd->data_sg;
112 out_num++;
113 }
114
115 /* Add return status */
116 sg_init_one(&stat, va_status, sizeof(*va_status));
117 sgs[out_num + in_num] = &stat;
118 in_num++;
119
120 if (cmd->result_sg) {
121 sgs[out_num + in_num] = cmd->result_sg;
122 in_num++;
123 }
124
125 mutex_lock(&vp_dev->admin_vq.cmd_lock);
126 ret = virtqueue_exec_admin_cmd(&vp_dev->admin_vq,
127 le16_to_cpu(cmd->opcode),
128 sgs, out_num, in_num, sgs);
129 mutex_unlock(&vp_dev->admin_vq.cmd_lock);
130
131 if (ret) {
132 dev_err(&vdev->dev,
133 "Failed to execute command on admin vq: %d\n.", ret);
134 goto err_cmd_exec;
135 }
136
137 status = le16_to_cpu(va_status->status);
138 if (status != VIRTIO_ADMIN_STATUS_OK) {
139 dev_err(&vdev->dev,
140 "admin command error: status(%#x) qualifier(%#x)\n",
141 status, le16_to_cpu(va_status->status_qualifier));
142 ret = -status;
143 }
144
145err_cmd_exec:
146 kfree(va_hdr);
147err_alloc:
148 kfree(va_status);
149 return ret;
150}
151
152static void virtio_pci_admin_cmd_list_init(struct virtio_device *virtio_dev)
153{
154 struct virtio_pci_device *vp_dev = to_vp_device(virtio_dev);
155 struct virtio_admin_cmd cmd = {};
156 struct scatterlist result_sg;
157 struct scatterlist data_sg;
158 __le64 *data;
159 int ret;
160
161 data = kzalloc(sizeof(*data), GFP_KERNEL);
162 if (!data)
163 return;
164
165 sg_init_one(&result_sg, data, sizeof(*data));
166 cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_LIST_QUERY);
167 cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SRIOV);
168 cmd.result_sg = &result_sg;
169
170 ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd);
171 if (ret)
172 goto end;
173
174 *data &= cpu_to_le64(VIRTIO_ADMIN_CMD_BITMAP);
175 sg_init_one(&data_sg, data, sizeof(*data));
176 cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_LIST_USE);
177 cmd.data_sg = &data_sg;
178 cmd.result_sg = NULL;
179
180 ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd);
181 if (ret)
182 goto end;
183
184 vp_dev->admin_vq.supported_cmds = le64_to_cpu(*data);
185end:
186 kfree(data);
187}
188
189static void vp_modern_avq_activate(struct virtio_device *vdev)
190{
191 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
192 struct virtio_pci_admin_vq *admin_vq = &vp_dev->admin_vq;
193
194 if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ))
195 return;
196
197 __virtqueue_unbreak(admin_vq->info.vq);
198 virtio_pci_admin_cmd_list_init(vdev);
199}
200
201static void vp_modern_avq_deactivate(struct virtio_device *vdev)
202{
203 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
204 struct virtio_pci_admin_vq *admin_vq = &vp_dev->admin_vq;
205
206 if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ))
207 return;
208
209 __virtqueue_break(admin_vq->info.vq);
210}
211
212static void vp_transport_features(struct virtio_device *vdev, u64 features)
213{
214 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
215 struct pci_dev *pci_dev = vp_dev->pci_dev;
216
217 if ((features & BIT_ULL(VIRTIO_F_SR_IOV)) &&
218 pci_find_ext_capability(pci_dev, PCI_EXT_CAP_ID_SRIOV))
219 __virtio_set_bit(vdev, VIRTIO_F_SR_IOV);
220
221 if (features & BIT_ULL(VIRTIO_F_RING_RESET))
222 __virtio_set_bit(vdev, VIRTIO_F_RING_RESET);
223
224 if (features & BIT_ULL(VIRTIO_F_ADMIN_VQ))
225 __virtio_set_bit(vdev, VIRTIO_F_ADMIN_VQ);
226}
227
228static int __vp_check_common_size_one_feature(struct virtio_device *vdev, u32 fbit,
229 u32 offset, const char *fname)
230{
231 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
232
233 if (!__virtio_test_bit(vdev, fbit))
234 return 0;
235
236 if (likely(vp_dev->mdev.common_len >= offset))
237 return 0;
238
239 dev_err(&vdev->dev,
240 "virtio: common cfg size(%zu) does not match the feature %s\n",
241 vp_dev->mdev.common_len, fname);
242
243 return -EINVAL;
244}
245
246#define vp_check_common_size_one_feature(vdev, fbit, field) \
247 __vp_check_common_size_one_feature(vdev, fbit, \
248 offsetofend(struct virtio_pci_modern_common_cfg, field), #fbit)
249
250static int vp_check_common_size(struct virtio_device *vdev)
251{
252 if (vp_check_common_size_one_feature(vdev, VIRTIO_F_NOTIF_CONFIG_DATA, queue_notify_data))
253 return -EINVAL;
254
255 if (vp_check_common_size_one_feature(vdev, VIRTIO_F_RING_RESET, queue_reset))
256 return -EINVAL;
257
258 if (vp_check_common_size_one_feature(vdev, VIRTIO_F_ADMIN_VQ, admin_queue_num))
259 return -EINVAL;
260
261 return 0;
262}
263
264/* virtio config->finalize_features() implementation */
265static int vp_finalize_features(struct virtio_device *vdev)
266{
267 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
268 u64 features = vdev->features;
269
270 /* Give virtio_ring a chance to accept features. */
271 vring_transport_features(vdev);
272
273 /* Give virtio_pci a chance to accept features. */
274 vp_transport_features(vdev, features);
275
276 if (!__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
277 dev_err(&vdev->dev, "virtio: device uses modern interface "
278 "but does not have VIRTIO_F_VERSION_1\n");
279 return -EINVAL;
280 }
281
282 if (vp_check_common_size(vdev))
283 return -EINVAL;
284
285 vp_modern_set_features(&vp_dev->mdev, vdev->features);
286
287 return 0;
288}
289
290/* virtio config->get() implementation */
291static void vp_get(struct virtio_device *vdev, unsigned int offset,
292 void *buf, unsigned int len)
293{
294 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
295 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
296 void __iomem *device = mdev->device;
297 u8 b;
298 __le16 w;
299 __le32 l;
300
301 BUG_ON(offset + len > mdev->device_len);
302
303 switch (len) {
304 case 1:
305 b = ioread8(device + offset);
306 memcpy(buf, &b, sizeof b);
307 break;
308 case 2:
309 w = cpu_to_le16(ioread16(device + offset));
310 memcpy(buf, &w, sizeof w);
311 break;
312 case 4:
313 l = cpu_to_le32(ioread32(device + offset));
314 memcpy(buf, &l, sizeof l);
315 break;
316 case 8:
317 l = cpu_to_le32(ioread32(device + offset));
318 memcpy(buf, &l, sizeof l);
319 l = cpu_to_le32(ioread32(device + offset + sizeof l));
320 memcpy(buf + sizeof l, &l, sizeof l);
321 break;
322 default:
323 BUG();
324 }
325}
326
327/* the config->set() implementation. it's symmetric to the config->get()
328 * implementation */
329static void vp_set(struct virtio_device *vdev, unsigned int offset,
330 const void *buf, unsigned int len)
331{
332 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
333 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
334 void __iomem *device = mdev->device;
335 u8 b;
336 __le16 w;
337 __le32 l;
338
339 BUG_ON(offset + len > mdev->device_len);
340
341 switch (len) {
342 case 1:
343 memcpy(&b, buf, sizeof b);
344 iowrite8(b, device + offset);
345 break;
346 case 2:
347 memcpy(&w, buf, sizeof w);
348 iowrite16(le16_to_cpu(w), device + offset);
349 break;
350 case 4:
351 memcpy(&l, buf, sizeof l);
352 iowrite32(le32_to_cpu(l), device + offset);
353 break;
354 case 8:
355 memcpy(&l, buf, sizeof l);
356 iowrite32(le32_to_cpu(l), device + offset);
357 memcpy(&l, buf + sizeof l, sizeof l);
358 iowrite32(le32_to_cpu(l), device + offset + sizeof l);
359 break;
360 default:
361 BUG();
362 }
363}
364
365static u32 vp_generation(struct virtio_device *vdev)
366{
367 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
368
369 return vp_modern_generation(&vp_dev->mdev);
370}
371
372/* config->{get,set}_status() implementations */
373static u8 vp_get_status(struct virtio_device *vdev)
374{
375 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
376
377 return vp_modern_get_status(&vp_dev->mdev);
378}
379
380static void vp_set_status(struct virtio_device *vdev, u8 status)
381{
382 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
383
384 /* We should never be setting status to 0. */
385 BUG_ON(status == 0);
386 vp_modern_set_status(&vp_dev->mdev, status);
387 if (status & VIRTIO_CONFIG_S_DRIVER_OK)
388 vp_modern_avq_activate(vdev);
389}
390
391static void vp_reset(struct virtio_device *vdev)
392{
393 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
394 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
395
396 /* 0 status means a reset. */
397 vp_modern_set_status(mdev, 0);
398 /* After writing 0 to device_status, the driver MUST wait for a read of
399 * device_status to return 0 before reinitializing the device.
400 * This will flush out the status write, and flush in device writes,
401 * including MSI-X interrupts, if any.
402 */
403 while (vp_modern_get_status(mdev))
404 msleep(1);
405
406 vp_modern_avq_deactivate(vdev);
407
408 /* Flush pending VQ/configuration callbacks. */
409 vp_synchronize_vectors(vdev);
410}
411
412static int vp_active_vq(struct virtqueue *vq, u16 msix_vec)
413{
414 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
415 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
416 unsigned long index;
417
418 index = vq->index;
419
420 /* activate the queue */
421 vp_modern_set_queue_size(mdev, index, virtqueue_get_vring_size(vq));
422 vp_modern_queue_address(mdev, index, virtqueue_get_desc_addr(vq),
423 virtqueue_get_avail_addr(vq),
424 virtqueue_get_used_addr(vq));
425
426 if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
427 msix_vec = vp_modern_queue_vector(mdev, index, msix_vec);
428 if (msix_vec == VIRTIO_MSI_NO_VECTOR)
429 return -EBUSY;
430 }
431
432 return 0;
433}
434
435static int vp_modern_disable_vq_and_reset(struct virtqueue *vq)
436{
437 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
438 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
439 struct virtio_pci_vq_info *info;
440 unsigned long flags;
441
442 if (!virtio_has_feature(vq->vdev, VIRTIO_F_RING_RESET))
443 return -ENOENT;
444
445 vp_modern_set_queue_reset(mdev, vq->index);
446
447 info = vp_dev->vqs[vq->index];
448
449 /* delete vq from irq handler */
450 spin_lock_irqsave(&vp_dev->lock, flags);
451 list_del(&info->node);
452 spin_unlock_irqrestore(&vp_dev->lock, flags);
453
454 INIT_LIST_HEAD(&info->node);
455
456#ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION
457 __virtqueue_break(vq);
458#endif
459
460 /* For the case where vq has an exclusive irq, call synchronize_irq() to
461 * wait for completion.
462 *
463 * note: We can't use disable_irq() since it conflicts with the affinity
464 * managed IRQ that is used by some drivers.
465 */
466 if (vp_dev->per_vq_vectors && info->msix_vector != VIRTIO_MSI_NO_VECTOR)
467 synchronize_irq(pci_irq_vector(vp_dev->pci_dev, info->msix_vector));
468
469 vq->reset = true;
470
471 return 0;
472}
473
474static int vp_modern_enable_vq_after_reset(struct virtqueue *vq)
475{
476 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
477 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
478 struct virtio_pci_vq_info *info;
479 unsigned long flags, index;
480 int err;
481
482 if (!vq->reset)
483 return -EBUSY;
484
485 index = vq->index;
486 info = vp_dev->vqs[index];
487
488 if (vp_modern_get_queue_reset(mdev, index))
489 return -EBUSY;
490
491 if (vp_modern_get_queue_enable(mdev, index))
492 return -EBUSY;
493
494 err = vp_active_vq(vq, info->msix_vector);
495 if (err)
496 return err;
497
498 if (vq->callback) {
499 spin_lock_irqsave(&vp_dev->lock, flags);
500 list_add(&info->node, &vp_dev->virtqueues);
501 spin_unlock_irqrestore(&vp_dev->lock, flags);
502 } else {
503 INIT_LIST_HEAD(&info->node);
504 }
505
506#ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION
507 __virtqueue_unbreak(vq);
508#endif
509
510 vp_modern_set_queue_enable(&vp_dev->mdev, index, true);
511 vq->reset = false;
512
513 return 0;
514}
515
516static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
517{
518 return vp_modern_config_vector(&vp_dev->mdev, vector);
519}
520
521static bool vp_notify_with_data(struct virtqueue *vq)
522{
523 u32 data = vring_notification_data(vq);
524
525 iowrite32(data, (void __iomem *)vq->priv);
526
527 return true;
528}
529
530static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
531 struct virtio_pci_vq_info *info,
532 unsigned int index,
533 void (*callback)(struct virtqueue *vq),
534 const char *name,
535 bool ctx,
536 u16 msix_vec)
537{
538
539 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
540 bool (*notify)(struct virtqueue *vq);
541 struct virtqueue *vq;
542 bool is_avq;
543 u16 num;
544 int err;
545
546 if (__virtio_test_bit(&vp_dev->vdev, VIRTIO_F_NOTIFICATION_DATA))
547 notify = vp_notify_with_data;
548 else
549 notify = vp_notify;
550
551 is_avq = vp_is_avq(&vp_dev->vdev, index);
552 if (index >= vp_modern_get_num_queues(mdev) && !is_avq)
553 return ERR_PTR(-EINVAL);
554
555 num = is_avq ?
556 VIRTIO_AVQ_SGS_MAX : vp_modern_get_queue_size(mdev, index);
557 /* Check if queue is either not available or already active. */
558 if (!num || vp_modern_get_queue_enable(mdev, index))
559 return ERR_PTR(-ENOENT);
560
561 info->msix_vector = msix_vec;
562
563 /* create the vring */
564 vq = vring_create_virtqueue(index, num,
565 SMP_CACHE_BYTES, &vp_dev->vdev,
566 true, true, ctx,
567 notify, callback, name);
568 if (!vq)
569 return ERR_PTR(-ENOMEM);
570
571 vq->num_max = num;
572
573 err = vp_active_vq(vq, msix_vec);
574 if (err)
575 goto err;
576
577 vq->priv = (void __force *)vp_modern_map_vq_notify(mdev, index, NULL);
578 if (!vq->priv) {
579 err = -ENOMEM;
580 goto err;
581 }
582
583 if (is_avq) {
584 mutex_lock(&vp_dev->admin_vq.cmd_lock);
585 vp_dev->admin_vq.info.vq = vq;
586 mutex_unlock(&vp_dev->admin_vq.cmd_lock);
587 }
588
589 return vq;
590
591err:
592 vring_del_virtqueue(vq);
593 return ERR_PTR(err);
594}
595
596static int vp_modern_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
597 struct virtqueue *vqs[],
598 vq_callback_t *callbacks[],
599 const char * const names[], const bool *ctx,
600 struct irq_affinity *desc)
601{
602 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
603 struct virtqueue *vq;
604 int rc = vp_find_vqs(vdev, nvqs, vqs, callbacks, names, ctx, desc);
605
606 if (rc)
607 return rc;
608
609 /* Select and activate all queues. Has to be done last: once we do
610 * this, there's no way to go back except reset.
611 */
612 list_for_each_entry(vq, &vdev->vqs, list)
613 vp_modern_set_queue_enable(&vp_dev->mdev, vq->index, true);
614
615 return 0;
616}
617
618static void del_vq(struct virtio_pci_vq_info *info)
619{
620 struct virtqueue *vq = info->vq;
621 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
622 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
623
624 if (vp_is_avq(&vp_dev->vdev, vq->index)) {
625 mutex_lock(&vp_dev->admin_vq.cmd_lock);
626 vp_dev->admin_vq.info.vq = NULL;
627 mutex_unlock(&vp_dev->admin_vq.cmd_lock);
628 }
629
630 if (vp_dev->msix_enabled)
631 vp_modern_queue_vector(mdev, vq->index,
632 VIRTIO_MSI_NO_VECTOR);
633
634 if (!mdev->notify_base)
635 pci_iounmap(mdev->pci_dev, (void __force __iomem *)vq->priv);
636
637 vring_del_virtqueue(vq);
638}
639
640static int virtio_pci_find_shm_cap(struct pci_dev *dev, u8 required_id,
641 u8 *bar, u64 *offset, u64 *len)
642{
643 int pos;
644
645 for (pos = pci_find_capability(dev, PCI_CAP_ID_VNDR); pos > 0;
646 pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_VNDR)) {
647 u8 type, cap_len, id, res_bar;
648 u32 tmp32;
649 u64 res_offset, res_length;
650
651 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
652 cfg_type), &type);
653 if (type != VIRTIO_PCI_CAP_SHARED_MEMORY_CFG)
654 continue;
655
656 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
657 cap_len), &cap_len);
658 if (cap_len != sizeof(struct virtio_pci_cap64)) {
659 dev_err(&dev->dev, "%s: shm cap with bad size offset:"
660 " %d size: %d\n", __func__, pos, cap_len);
661 continue;
662 }
663
664 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
665 id), &id);
666 if (id != required_id)
667 continue;
668
669 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
670 bar), &res_bar);
671 if (res_bar >= PCI_STD_NUM_BARS)
672 continue;
673
674 /* Type and ID match, and the BAR value isn't reserved.
675 * Looks good.
676 */
677
678 /* Read the lower 32bit of length and offset */
679 pci_read_config_dword(dev, pos + offsetof(struct virtio_pci_cap,
680 offset), &tmp32);
681 res_offset = tmp32;
682 pci_read_config_dword(dev, pos + offsetof(struct virtio_pci_cap,
683 length), &tmp32);
684 res_length = tmp32;
685
686 /* and now the top half */
687 pci_read_config_dword(dev,
688 pos + offsetof(struct virtio_pci_cap64,
689 offset_hi), &tmp32);
690 res_offset |= ((u64)tmp32) << 32;
691 pci_read_config_dword(dev,
692 pos + offsetof(struct virtio_pci_cap64,
693 length_hi), &tmp32);
694 res_length |= ((u64)tmp32) << 32;
695
696 *bar = res_bar;
697 *offset = res_offset;
698 *len = res_length;
699
700 return pos;
701 }
702 return 0;
703}
704
705static bool vp_get_shm_region(struct virtio_device *vdev,
706 struct virtio_shm_region *region, u8 id)
707{
708 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
709 struct pci_dev *pci_dev = vp_dev->pci_dev;
710 u8 bar;
711 u64 offset, len;
712 phys_addr_t phys_addr;
713 size_t bar_len;
714
715 if (!virtio_pci_find_shm_cap(pci_dev, id, &bar, &offset, &len))
716 return false;
717
718 phys_addr = pci_resource_start(pci_dev, bar);
719 bar_len = pci_resource_len(pci_dev, bar);
720
721 if ((offset + len) < offset) {
722 dev_err(&pci_dev->dev, "%s: cap offset+len overflow detected\n",
723 __func__);
724 return false;
725 }
726
727 if (offset + len > bar_len) {
728 dev_err(&pci_dev->dev, "%s: bar shorter than cap offset+len\n",
729 __func__);
730 return false;
731 }
732
733 region->len = len;
734 region->addr = (u64) phys_addr + offset;
735
736 return true;
737}
738
739static int vp_modern_create_avq(struct virtio_device *vdev)
740{
741 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
742 struct virtio_pci_admin_vq *avq;
743 struct virtqueue *vq;
744 u16 admin_q_num;
745
746 if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ))
747 return 0;
748
749 admin_q_num = vp_modern_avq_num(&vp_dev->mdev);
750 if (!admin_q_num)
751 return -EINVAL;
752
753 avq = &vp_dev->admin_vq;
754 avq->vq_index = vp_modern_avq_index(&vp_dev->mdev);
755 sprintf(avq->name, "avq.%u", avq->vq_index);
756 vq = vp_dev->setup_vq(vp_dev, &vp_dev->admin_vq.info, avq->vq_index, NULL,
757 avq->name, NULL, VIRTIO_MSI_NO_VECTOR);
758 if (IS_ERR(vq)) {
759 dev_err(&vdev->dev, "failed to setup admin virtqueue, err=%ld",
760 PTR_ERR(vq));
761 return PTR_ERR(vq);
762 }
763
764 vp_modern_set_queue_enable(&vp_dev->mdev, avq->info.vq->index, true);
765 return 0;
766}
767
768static void vp_modern_destroy_avq(struct virtio_device *vdev)
769{
770 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
771
772 if (!virtio_has_feature(vdev, VIRTIO_F_ADMIN_VQ))
773 return;
774
775 vp_dev->del_vq(&vp_dev->admin_vq.info);
776}
777
778static const struct virtio_config_ops virtio_pci_config_nodev_ops = {
779 .get = NULL,
780 .set = NULL,
781 .generation = vp_generation,
782 .get_status = vp_get_status,
783 .set_status = vp_set_status,
784 .reset = vp_reset,
785 .find_vqs = vp_modern_find_vqs,
786 .del_vqs = vp_del_vqs,
787 .synchronize_cbs = vp_synchronize_vectors,
788 .get_features = vp_get_features,
789 .finalize_features = vp_finalize_features,
790 .bus_name = vp_bus_name,
791 .set_vq_affinity = vp_set_vq_affinity,
792 .get_vq_affinity = vp_get_vq_affinity,
793 .get_shm_region = vp_get_shm_region,
794 .disable_vq_and_reset = vp_modern_disable_vq_and_reset,
795 .enable_vq_after_reset = vp_modern_enable_vq_after_reset,
796 .create_avq = vp_modern_create_avq,
797 .destroy_avq = vp_modern_destroy_avq,
798};
799
800static const struct virtio_config_ops virtio_pci_config_ops = {
801 .get = vp_get,
802 .set = vp_set,
803 .generation = vp_generation,
804 .get_status = vp_get_status,
805 .set_status = vp_set_status,
806 .reset = vp_reset,
807 .find_vqs = vp_modern_find_vqs,
808 .del_vqs = vp_del_vqs,
809 .synchronize_cbs = vp_synchronize_vectors,
810 .get_features = vp_get_features,
811 .finalize_features = vp_finalize_features,
812 .bus_name = vp_bus_name,
813 .set_vq_affinity = vp_set_vq_affinity,
814 .get_vq_affinity = vp_get_vq_affinity,
815 .get_shm_region = vp_get_shm_region,
816 .disable_vq_and_reset = vp_modern_disable_vq_and_reset,
817 .enable_vq_after_reset = vp_modern_enable_vq_after_reset,
818 .create_avq = vp_modern_create_avq,
819 .destroy_avq = vp_modern_destroy_avq,
820};
821
822/* the PCI probing function */
823int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev)
824{
825 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
826 struct pci_dev *pci_dev = vp_dev->pci_dev;
827 int err;
828
829 mdev->pci_dev = pci_dev;
830
831 err = vp_modern_probe(mdev);
832 if (err)
833 return err;
834
835 if (mdev->device)
836 vp_dev->vdev.config = &virtio_pci_config_ops;
837 else
838 vp_dev->vdev.config = &virtio_pci_config_nodev_ops;
839
840 vp_dev->config_vector = vp_config_vector;
841 vp_dev->setup_vq = setup_vq;
842 vp_dev->del_vq = del_vq;
843 vp_dev->is_avq = vp_is_avq;
844 vp_dev->isr = mdev->isr;
845 vp_dev->vdev.id = mdev->id;
846
847 mutex_init(&vp_dev->admin_vq.cmd_lock);
848 return 0;
849}
850
851void virtio_pci_modern_remove(struct virtio_pci_device *vp_dev)
852{
853 struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
854
855 mutex_destroy(&vp_dev->admin_vq.cmd_lock);
856 vp_modern_remove(mdev);
857}