1 // SPDX-License-Identifier: GPL-2.0-or-later
3 #include <linux/virtio_pci_modern.h>
4 #include <linux/module.h>
6 #include <linux/delay.h>
9 * vp_modern_map_capability - map a part of virtio pci capability
10 * @mdev: the modern virtio-pci device
11 * @off: offset of the capability
12 * @minlen: minimal length of the capability
13 * @align: align requirement
14 * @start: start from the capability
16 * @len: the length that is actually mapped
17 * @pa: physical address of the capability
19 * Returns the io address of for the part of the capability
22 vp_modern_map_capability(struct virtio_pci_modern_device *mdev, int off,
23 size_t minlen, u32 align, u32 start, u32 size,
24 size_t *len, resource_size_t *pa)
26 struct pci_dev *dev = mdev->pci_dev;
31 pci_read_config_byte(dev, off + offsetof(struct virtio_pci_cap,
34 pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, offset),
36 pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, length),
39 /* Check if the BAR may have changed since we requested the region. */
40 if (bar >= PCI_STD_NUM_BARS || !(mdev->modern_bars & (1 << bar))) {
42 "virtio_pci: bar unexpectedly changed to %u\n", bar);
46 if (length <= start) {
48 "virtio_pci: bad capability len %u (>%u expected)\n",
53 if (length - start < minlen) {
55 "virtio_pci: bad capability len %u (>=%zu expected)\n",
62 if (start + offset < offset) {
64 "virtio_pci: map wrap-around %u+%u\n",
71 if (offset & (align - 1)) {
73 "virtio_pci: offset %u not aligned to %u\n",
84 if (minlen + offset < minlen ||
85 minlen + offset > pci_resource_len(dev, bar)) {
87 "virtio_pci: map virtio %zu@%u "
88 "out of range on bar %i length %lu\n",
90 bar, (unsigned long)pci_resource_len(dev, bar));
94 p = pci_iomap_range(dev, bar, offset, length);
97 "virtio_pci: unable to map virtio %u@%u on bar %i\n",
100 *pa = pci_resource_start(dev, bar) + offset;
106 * virtio_pci_find_capability - walk capabilities to find device info.
107 * @dev: the pci device
108 * @cfg_type: the VIRTIO_PCI_CAP_* value we seek
109 * @ioresource_types: IORESOURCE_MEM and/or IORESOURCE_IO.
110 * @bars: the bitmask of BARs
112 * Returns offset of the capability, or 0.
114 static inline int virtio_pci_find_capability(struct pci_dev *dev, u8 cfg_type,
115 u32 ioresource_types, int *bars)
119 for (pos = pci_find_capability(dev, PCI_CAP_ID_VNDR);
121 pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_VNDR)) {
123 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
126 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
130 /* Ignore structures with reserved BAR values */
131 if (bar >= PCI_STD_NUM_BARS)
134 if (type == cfg_type) {
135 if (pci_resource_len(dev, bar) &&
136 pci_resource_flags(dev, bar) & ioresource_types) {
145 /* This is part of the ABI. Don't screw with it. */
146 static inline void check_offsets(void)
148 /* Note: disk space was harmed in compilation of this function. */
149 BUILD_BUG_ON(VIRTIO_PCI_CAP_VNDR !=
150 offsetof(struct virtio_pci_cap, cap_vndr));
151 BUILD_BUG_ON(VIRTIO_PCI_CAP_NEXT !=
152 offsetof(struct virtio_pci_cap, cap_next));
153 BUILD_BUG_ON(VIRTIO_PCI_CAP_LEN !=
154 offsetof(struct virtio_pci_cap, cap_len));
155 BUILD_BUG_ON(VIRTIO_PCI_CAP_CFG_TYPE !=
156 offsetof(struct virtio_pci_cap, cfg_type));
157 BUILD_BUG_ON(VIRTIO_PCI_CAP_BAR !=
158 offsetof(struct virtio_pci_cap, bar));
159 BUILD_BUG_ON(VIRTIO_PCI_CAP_OFFSET !=
160 offsetof(struct virtio_pci_cap, offset));
161 BUILD_BUG_ON(VIRTIO_PCI_CAP_LENGTH !=
162 offsetof(struct virtio_pci_cap, length));
163 BUILD_BUG_ON(VIRTIO_PCI_NOTIFY_CAP_MULT !=
164 offsetof(struct virtio_pci_notify_cap,
165 notify_off_multiplier));
166 BUILD_BUG_ON(VIRTIO_PCI_COMMON_DFSELECT !=
167 offsetof(struct virtio_pci_common_cfg,
168 device_feature_select));
169 BUILD_BUG_ON(VIRTIO_PCI_COMMON_DF !=
170 offsetof(struct virtio_pci_common_cfg, device_feature));
171 BUILD_BUG_ON(VIRTIO_PCI_COMMON_GFSELECT !=
172 offsetof(struct virtio_pci_common_cfg,
173 guest_feature_select));
174 BUILD_BUG_ON(VIRTIO_PCI_COMMON_GF !=
175 offsetof(struct virtio_pci_common_cfg, guest_feature));
176 BUILD_BUG_ON(VIRTIO_PCI_COMMON_MSIX !=
177 offsetof(struct virtio_pci_common_cfg, msix_config));
178 BUILD_BUG_ON(VIRTIO_PCI_COMMON_NUMQ !=
179 offsetof(struct virtio_pci_common_cfg, num_queues));
180 BUILD_BUG_ON(VIRTIO_PCI_COMMON_STATUS !=
181 offsetof(struct virtio_pci_common_cfg, device_status));
182 BUILD_BUG_ON(VIRTIO_PCI_COMMON_CFGGENERATION !=
183 offsetof(struct virtio_pci_common_cfg, config_generation));
184 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SELECT !=
185 offsetof(struct virtio_pci_common_cfg, queue_select));
186 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SIZE !=
187 offsetof(struct virtio_pci_common_cfg, queue_size));
188 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_MSIX !=
189 offsetof(struct virtio_pci_common_cfg, queue_msix_vector));
190 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_ENABLE !=
191 offsetof(struct virtio_pci_common_cfg, queue_enable));
192 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_NOFF !=
193 offsetof(struct virtio_pci_common_cfg, queue_notify_off));
194 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCLO !=
195 offsetof(struct virtio_pci_common_cfg, queue_desc_lo));
196 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCHI !=
197 offsetof(struct virtio_pci_common_cfg, queue_desc_hi));
198 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILLO !=
199 offsetof(struct virtio_pci_common_cfg, queue_avail_lo));
200 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILHI !=
201 offsetof(struct virtio_pci_common_cfg, queue_avail_hi));
202 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDLO !=
203 offsetof(struct virtio_pci_common_cfg, queue_used_lo));
204 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDHI !=
205 offsetof(struct virtio_pci_common_cfg, queue_used_hi));
206 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_NDATA !=
207 offsetof(struct virtio_pci_modern_common_cfg, queue_notify_data));
208 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_RESET !=
209 offsetof(struct virtio_pci_modern_common_cfg, queue_reset));
210 BUILD_BUG_ON(VIRTIO_PCI_COMMON_ADM_Q_IDX !=
211 offsetof(struct virtio_pci_modern_common_cfg, admin_queue_index));
212 BUILD_BUG_ON(VIRTIO_PCI_COMMON_ADM_Q_NUM !=
213 offsetof(struct virtio_pci_modern_common_cfg, admin_queue_num));
217 * vp_modern_probe: probe the modern virtio pci device, note that the
218 * caller is required to enable PCI device before calling this function.
219 * @mdev: the modern virtio-pci device
221 * Return 0 on succeed otherwise fail
223 int vp_modern_probe(struct virtio_pci_modern_device *mdev)
225 struct pci_dev *pci_dev = mdev->pci_dev;
226 int err, common, isr, notify, device;
233 if (mdev->device_id_check) {
234 devid = mdev->device_id_check(pci_dev);
237 mdev->id.device = devid;
239 /* We only own devices >= 0x1000 and <= 0x107f: leave the rest. */
240 if (pci_dev->device < 0x1000 || pci_dev->device > 0x107f)
243 if (pci_dev->device < 0x1040) {
244 /* Transitional devices: use the PCI subsystem device id as
245 * virtio device id, same as legacy driver always did.
247 mdev->id.device = pci_dev->subsystem_device;
249 /* Modern devices: simply use PCI device id, but start from 0x1040. */
250 mdev->id.device = pci_dev->device - 0x1040;
253 mdev->id.vendor = pci_dev->subsystem_vendor;
255 /* check for a common config: if not, use legacy mode (bar 0). */
256 common = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_COMMON_CFG,
257 IORESOURCE_IO | IORESOURCE_MEM,
260 dev_info(&pci_dev->dev,
261 "virtio_pci: leaving for legacy driver\n");
265 /* If common is there, these should be too... */
266 isr = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_ISR_CFG,
267 IORESOURCE_IO | IORESOURCE_MEM,
269 notify = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_NOTIFY_CFG,
270 IORESOURCE_IO | IORESOURCE_MEM,
272 if (!isr || !notify) {
273 dev_err(&pci_dev->dev,
274 "virtio_pci: missing capabilities %i/%i/%i\n",
275 common, isr, notify);
279 err = dma_set_mask_and_coherent(&pci_dev->dev,
280 mdev->dma_mask ? : DMA_BIT_MASK(64));
282 err = dma_set_mask_and_coherent(&pci_dev->dev,
285 dev_warn(&pci_dev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n");
287 /* Device capability is only mandatory for devices that have
288 * device-specific configuration.
290 device = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_DEVICE_CFG,
291 IORESOURCE_IO | IORESOURCE_MEM,
294 err = pci_request_selected_regions(pci_dev, mdev->modern_bars,
295 "virtio-pci-modern");
300 mdev->common = vp_modern_map_capability(mdev, common,
301 sizeof(struct virtio_pci_common_cfg), 4, 0,
302 offsetofend(struct virtio_pci_modern_common_cfg,
304 &mdev->common_len, NULL);
307 mdev->isr = vp_modern_map_capability(mdev, isr, sizeof(u8), 1,
313 /* Read notify_off_multiplier from config space. */
314 pci_read_config_dword(pci_dev,
315 notify + offsetof(struct virtio_pci_notify_cap,
316 notify_off_multiplier),
317 &mdev->notify_offset_multiplier);
318 /* Read notify length and offset from config space. */
319 pci_read_config_dword(pci_dev,
320 notify + offsetof(struct virtio_pci_notify_cap,
324 pci_read_config_dword(pci_dev,
325 notify + offsetof(struct virtio_pci_notify_cap,
329 /* We don't know how many VQs we'll map, ahead of the time.
330 * If notify length is small, map it all now.
331 * Otherwise, map each VQ individually later.
333 if ((u64)notify_length + (notify_offset % PAGE_SIZE) <= PAGE_SIZE) {
334 mdev->notify_base = vp_modern_map_capability(mdev, notify,
339 if (!mdev->notify_base)
342 mdev->notify_map_cap = notify;
345 /* Again, we don't know how much we should map, but PAGE_SIZE
346 * is more than enough for all existing devices.
349 mdev->device = vp_modern_map_capability(mdev, device, 0, 4,
360 if (mdev->notify_base)
361 pci_iounmap(pci_dev, mdev->notify_base);
363 pci_iounmap(pci_dev, mdev->isr);
365 pci_iounmap(pci_dev, mdev->common);
367 pci_release_selected_regions(pci_dev, mdev->modern_bars);
370 EXPORT_SYMBOL_GPL(vp_modern_probe);
373 * vp_modern_remove: remove and cleanup the modern virtio pci device
374 * @mdev: the modern virtio-pci device
376 void vp_modern_remove(struct virtio_pci_modern_device *mdev)
378 struct pci_dev *pci_dev = mdev->pci_dev;
381 pci_iounmap(pci_dev, mdev->device);
382 if (mdev->notify_base)
383 pci_iounmap(pci_dev, mdev->notify_base);
384 pci_iounmap(pci_dev, mdev->isr);
385 pci_iounmap(pci_dev, mdev->common);
386 pci_release_selected_regions(pci_dev, mdev->modern_bars);
388 EXPORT_SYMBOL_GPL(vp_modern_remove);
391 * vp_modern_get_features - get features from device
392 * @mdev: the modern virtio-pci device
394 * Returns the features read from the device
396 u64 vp_modern_get_features(struct virtio_pci_modern_device *mdev)
398 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
402 vp_iowrite32(0, &cfg->device_feature_select);
403 features = vp_ioread32(&cfg->device_feature);
404 vp_iowrite32(1, &cfg->device_feature_select);
405 features |= ((u64)vp_ioread32(&cfg->device_feature) << 32);
409 EXPORT_SYMBOL_GPL(vp_modern_get_features);
412 * vp_modern_get_driver_features - get driver features from device
413 * @mdev: the modern virtio-pci device
415 * Returns the driver features read from the device
417 u64 vp_modern_get_driver_features(struct virtio_pci_modern_device *mdev)
419 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
423 vp_iowrite32(0, &cfg->guest_feature_select);
424 features = vp_ioread32(&cfg->guest_feature);
425 vp_iowrite32(1, &cfg->guest_feature_select);
426 features |= ((u64)vp_ioread32(&cfg->guest_feature) << 32);
430 EXPORT_SYMBOL_GPL(vp_modern_get_driver_features);
433 * vp_modern_set_features - set features to device
434 * @mdev: the modern virtio-pci device
435 * @features: the features set to device
437 void vp_modern_set_features(struct virtio_pci_modern_device *mdev,
440 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
442 vp_iowrite32(0, &cfg->guest_feature_select);
443 vp_iowrite32((u32)features, &cfg->guest_feature);
444 vp_iowrite32(1, &cfg->guest_feature_select);
445 vp_iowrite32(features >> 32, &cfg->guest_feature);
447 EXPORT_SYMBOL_GPL(vp_modern_set_features);
450 * vp_modern_generation - get the device genreation
451 * @mdev: the modern virtio-pci device
453 * Returns the genreation read from device
455 u32 vp_modern_generation(struct virtio_pci_modern_device *mdev)
457 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
459 return vp_ioread8(&cfg->config_generation);
461 EXPORT_SYMBOL_GPL(vp_modern_generation);
464 * vp_modern_get_status - get the device status
465 * @mdev: the modern virtio-pci device
467 * Returns the status read from device
469 u8 vp_modern_get_status(struct virtio_pci_modern_device *mdev)
471 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
473 return vp_ioread8(&cfg->device_status);
475 EXPORT_SYMBOL_GPL(vp_modern_get_status);
478 * vp_modern_set_status - set status to device
479 * @mdev: the modern virtio-pci device
480 * @status: the status set to device
482 void vp_modern_set_status(struct virtio_pci_modern_device *mdev,
485 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
488 * Per memory-barriers.txt, wmb() is not needed to guarantee
489 * that the cache coherent memory writes have completed
490 * before writing to the MMIO region.
492 vp_iowrite8(status, &cfg->device_status);
494 EXPORT_SYMBOL_GPL(vp_modern_set_status);
497 * vp_modern_get_queue_reset - get the queue reset status
498 * @mdev: the modern virtio-pci device
499 * @index: queue index
501 int vp_modern_get_queue_reset(struct virtio_pci_modern_device *mdev, u16 index)
503 struct virtio_pci_modern_common_cfg __iomem *cfg;
505 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common;
507 vp_iowrite16(index, &cfg->cfg.queue_select);
508 return vp_ioread16(&cfg->queue_reset);
510 EXPORT_SYMBOL_GPL(vp_modern_get_queue_reset);
513 * vp_modern_set_queue_reset - reset the queue
514 * @mdev: the modern virtio-pci device
515 * @index: queue index
517 void vp_modern_set_queue_reset(struct virtio_pci_modern_device *mdev, u16 index)
519 struct virtio_pci_modern_common_cfg __iomem *cfg;
521 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common;
523 vp_iowrite16(index, &cfg->cfg.queue_select);
524 vp_iowrite16(1, &cfg->queue_reset);
526 while (vp_ioread16(&cfg->queue_reset))
529 while (vp_ioread16(&cfg->cfg.queue_enable))
532 EXPORT_SYMBOL_GPL(vp_modern_set_queue_reset);
535 * vp_modern_queue_vector - set the MSIX vector for a specific virtqueue
536 * @mdev: the modern virtio-pci device
537 * @index: queue index
538 * @vector: the config vector
540 * Returns the config vector read from the device
542 u16 vp_modern_queue_vector(struct virtio_pci_modern_device *mdev,
543 u16 index, u16 vector)
545 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
547 vp_iowrite16(index, &cfg->queue_select);
548 vp_iowrite16(vector, &cfg->queue_msix_vector);
549 /* Flush the write out to device */
550 return vp_ioread16(&cfg->queue_msix_vector);
552 EXPORT_SYMBOL_GPL(vp_modern_queue_vector);
555 * vp_modern_config_vector - set the vector for config interrupt
556 * @mdev: the modern virtio-pci device
557 * @vector: the config vector
559 * Returns the config vector read from the device
561 u16 vp_modern_config_vector(struct virtio_pci_modern_device *mdev,
564 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
566 /* Setup the vector used for configuration events */
567 vp_iowrite16(vector, &cfg->msix_config);
568 /* Verify we had enough resources to assign the vector */
569 /* Will also flush the write out to device */
570 return vp_ioread16(&cfg->msix_config);
572 EXPORT_SYMBOL_GPL(vp_modern_config_vector);
575 * vp_modern_queue_address - set the virtqueue address
576 * @mdev: the modern virtio-pci device
577 * @index: the queue index
578 * @desc_addr: address of the descriptor area
579 * @driver_addr: address of the driver area
580 * @device_addr: address of the device area
582 void vp_modern_queue_address(struct virtio_pci_modern_device *mdev,
583 u16 index, u64 desc_addr, u64 driver_addr,
586 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
588 vp_iowrite16(index, &cfg->queue_select);
590 vp_iowrite64_twopart(desc_addr, &cfg->queue_desc_lo,
591 &cfg->queue_desc_hi);
592 vp_iowrite64_twopart(driver_addr, &cfg->queue_avail_lo,
593 &cfg->queue_avail_hi);
594 vp_iowrite64_twopart(device_addr, &cfg->queue_used_lo,
595 &cfg->queue_used_hi);
597 EXPORT_SYMBOL_GPL(vp_modern_queue_address);
600 * vp_modern_set_queue_enable - enable a virtqueue
601 * @mdev: the modern virtio-pci device
602 * @index: the queue index
603 * @enable: whether the virtqueue is enable or not
605 void vp_modern_set_queue_enable(struct virtio_pci_modern_device *mdev,
606 u16 index, bool enable)
608 vp_iowrite16(index, &mdev->common->queue_select);
609 vp_iowrite16(enable, &mdev->common->queue_enable);
611 EXPORT_SYMBOL_GPL(vp_modern_set_queue_enable);
614 * vp_modern_get_queue_enable - enable a virtqueue
615 * @mdev: the modern virtio-pci device
616 * @index: the queue index
618 * Returns whether a virtqueue is enabled or not
620 bool vp_modern_get_queue_enable(struct virtio_pci_modern_device *mdev,
623 vp_iowrite16(index, &mdev->common->queue_select);
625 return vp_ioread16(&mdev->common->queue_enable);
627 EXPORT_SYMBOL_GPL(vp_modern_get_queue_enable);
630 * vp_modern_set_queue_size - set size for a virtqueue
631 * @mdev: the modern virtio-pci device
632 * @index: the queue index
633 * @size: the size of the virtqueue
635 void vp_modern_set_queue_size(struct virtio_pci_modern_device *mdev,
638 vp_iowrite16(index, &mdev->common->queue_select);
639 vp_iowrite16(size, &mdev->common->queue_size);
642 EXPORT_SYMBOL_GPL(vp_modern_set_queue_size);
645 * vp_modern_get_queue_size - get size for a virtqueue
646 * @mdev: the modern virtio-pci device
647 * @index: the queue index
649 * Returns the size of the virtqueue
651 u16 vp_modern_get_queue_size(struct virtio_pci_modern_device *mdev,
654 vp_iowrite16(index, &mdev->common->queue_select);
656 return vp_ioread16(&mdev->common->queue_size);
659 EXPORT_SYMBOL_GPL(vp_modern_get_queue_size);
662 * vp_modern_get_num_queues - get the number of virtqueues
663 * @mdev: the modern virtio-pci device
665 * Returns the number of virtqueues
667 u16 vp_modern_get_num_queues(struct virtio_pci_modern_device *mdev)
669 return vp_ioread16(&mdev->common->num_queues);
671 EXPORT_SYMBOL_GPL(vp_modern_get_num_queues);
674 * vp_modern_get_queue_notify_off - get notification offset for a virtqueue
675 * @mdev: the modern virtio-pci device
676 * @index: the queue index
678 * Returns the notification offset for a virtqueue
680 static u16 vp_modern_get_queue_notify_off(struct virtio_pci_modern_device *mdev,
683 vp_iowrite16(index, &mdev->common->queue_select);
685 return vp_ioread16(&mdev->common->queue_notify_off);
689 * vp_modern_map_vq_notify - map notification area for a
691 * @mdev: the modern virtio-pci device
692 * @index: the queue index
693 * @pa: the pointer to the physical address of the nofity area
695 * Returns the address of the notification area
697 void __iomem *vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev,
698 u16 index, resource_size_t *pa)
700 u16 off = vp_modern_get_queue_notify_off(mdev, index);
702 if (mdev->notify_base) {
703 /* offset should not wrap */
704 if ((u64)off * mdev->notify_offset_multiplier + 2
705 > mdev->notify_len) {
706 dev_warn(&mdev->pci_dev->dev,
707 "bad notification offset %u (x %u) "
708 "for queue %u > %zd",
709 off, mdev->notify_offset_multiplier,
710 index, mdev->notify_len);
714 *pa = mdev->notify_pa +
715 off * mdev->notify_offset_multiplier;
716 return mdev->notify_base + off * mdev->notify_offset_multiplier;
718 return vp_modern_map_capability(mdev,
719 mdev->notify_map_cap, 2, 2,
720 off * mdev->notify_offset_multiplier, 2,
724 EXPORT_SYMBOL_GPL(vp_modern_map_vq_notify);
726 u16 vp_modern_avq_num(struct virtio_pci_modern_device *mdev)
728 struct virtio_pci_modern_common_cfg __iomem *cfg;
730 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common;
731 return vp_ioread16(&cfg->admin_queue_num);
733 EXPORT_SYMBOL_GPL(vp_modern_avq_num);
735 u16 vp_modern_avq_index(struct virtio_pci_modern_device *mdev)
737 struct virtio_pci_modern_common_cfg __iomem *cfg;
739 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common;
740 return vp_ioread16(&cfg->admin_queue_index);
742 EXPORT_SYMBOL_GPL(vp_modern_avq_index);
744 MODULE_VERSION("0.1");
745 MODULE_DESCRIPTION("Modern Virtio PCI Device");
746 MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>");
747 MODULE_LICENSE("GPL");