1// SPDX-License-Identifier: GPL-2.0-or-later
2
3#include <linux/virtio_pci_modern.h>
4#include <linux/module.h>
5#include <linux/pci.h>
6#include <linux/delay.h>
7
8/*
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
15 * @size: map size
16 * @len: the length that is actually mapped
17 * @pa: physical address of the capability
18 *
19 * Returns the io address of for the part of the capability
20 */
21static void __iomem *
22vp_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)
25{
26 struct pci_dev *dev = mdev->pci_dev;
27 u8 bar;
28 u32 offset, length;
29 void __iomem *p;
30
31 pci_read_config_byte(dev, where: off + offsetof(struct virtio_pci_cap,
32 bar),
33 val: &bar);
34 pci_read_config_dword(dev, where: off + offsetof(struct virtio_pci_cap, offset),
35 val: &offset);
36 pci_read_config_dword(dev, where: off + offsetof(struct virtio_pci_cap, length),
37 val: &length);
38
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))) {
41 dev_err(&dev->dev,
42 "virtio_pci: bar unexpectedly changed to %u\n", bar);
43 return NULL;
44 }
45
46 if (length <= start) {
47 dev_err(&dev->dev,
48 "virtio_pci: bad capability len %u (>%u expected)\n",
49 length, start);
50 return NULL;
51 }
52
53 if (length - start < minlen) {
54 dev_err(&dev->dev,
55 "virtio_pci: bad capability len %u (>=%zu expected)\n",
56 length, minlen);
57 return NULL;
58 }
59
60 length -= start;
61
62 if (start + offset < offset) {
63 dev_err(&dev->dev,
64 "virtio_pci: map wrap-around %u+%u\n",
65 start, offset);
66 return NULL;
67 }
68
69 offset += start;
70
71 if (offset & (align - 1)) {
72 dev_err(&dev->dev,
73 "virtio_pci: offset %u not aligned to %u\n",
74 offset, align);
75 return NULL;
76 }
77
78 if (length > size)
79 length = size;
80
81 if (len)
82 *len = length;
83
84 if (minlen + offset < minlen ||
85 minlen + offset > pci_resource_len(dev, bar)) {
86 dev_err(&dev->dev,
87 "virtio_pci: map virtio %zu@%u "
88 "out of range on bar %i length %lu\n",
89 minlen, offset,
90 bar, (unsigned long)pci_resource_len(dev, bar));
91 return NULL;
92 }
93
94 p = pci_iomap_range(dev, bar, offset, maxlen: length);
95 if (!p)
96 dev_err(&dev->dev,
97 "virtio_pci: unable to map virtio %u@%u on bar %i\n",
98 length, offset, bar);
99 else if (pa)
100 *pa = pci_resource_start(dev, bar) + offset;
101
102 return p;
103}
104
105/**
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
111 *
112 * Returns offset of the capability, or 0.
113 */
114static inline int virtio_pci_find_capability(struct pci_dev *dev, u8 cfg_type,
115 u32 ioresource_types, int *bars)
116{
117 int pos;
118
119 for (pos = pci_find_capability(dev, PCI_CAP_ID_VNDR);
120 pos > 0;
121 pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_VNDR)) {
122 u8 type, bar;
123 pci_read_config_byte(dev, where: pos + offsetof(struct virtio_pci_cap,
124 cfg_type),
125 val: &type);
126 pci_read_config_byte(dev, where: pos + offsetof(struct virtio_pci_cap,
127 bar),
128 val: &bar);
129
130 /* Ignore structures with reserved BAR values */
131 if (bar >= PCI_STD_NUM_BARS)
132 continue;
133
134 if (type == cfg_type) {
135 if (pci_resource_len(dev, bar) &&
136 pci_resource_flags(dev, bar) & ioresource_types) {
137 *bars |= (1 << bar);
138 return pos;
139 }
140 }
141 }
142 return 0;
143}
144
145/* This is part of the ABI. Don't screw with it. */
146static inline void check_offsets(void)
147{
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));
214}
215
216/*
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
220 *
221 * Return 0 on succeed otherwise fail
222 */
223int vp_modern_probe(struct virtio_pci_modern_device *mdev)
224{
225 struct pci_dev *pci_dev = mdev->pci_dev;
226 int err, common, isr, notify, device;
227 u32 notify_length;
228 u32 notify_offset;
229 int devid;
230
231 check_offsets();
232
233 if (mdev->device_id_check) {
234 devid = mdev->device_id_check(pci_dev);
235 if (devid < 0)
236 return devid;
237 mdev->id.device = devid;
238 } else {
239 /* We only own devices >= 0x1000 and <= 0x107f: leave the rest. */
240 if (pci_dev->device < 0x1000 || pci_dev->device > 0x107f)
241 return -ENODEV;
242
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.
246 */
247 mdev->id.device = pci_dev->subsystem_device;
248 } else {
249 /* Modern devices: simply use PCI device id, but start from 0x1040. */
250 mdev->id.device = pci_dev->device - 0x1040;
251 }
252 }
253 mdev->id.vendor = pci_dev->subsystem_vendor;
254
255 /* check for a common config: if not, use legacy mode (bar 0). */
256 common = virtio_pci_find_capability(dev: pci_dev, VIRTIO_PCI_CAP_COMMON_CFG,
257 IORESOURCE_IO | IORESOURCE_MEM,
258 bars: &mdev->modern_bars);
259 if (!common) {
260 dev_info(&pci_dev->dev,
261 "virtio_pci: leaving for legacy driver\n");
262 return -ENODEV;
263 }
264
265 /* If common is there, these should be too... */
266 isr = virtio_pci_find_capability(dev: pci_dev, VIRTIO_PCI_CAP_ISR_CFG,
267 IORESOURCE_IO | IORESOURCE_MEM,
268 bars: &mdev->modern_bars);
269 notify = virtio_pci_find_capability(dev: pci_dev, VIRTIO_PCI_CAP_NOTIFY_CFG,
270 IORESOURCE_IO | IORESOURCE_MEM,
271 bars: &mdev->modern_bars);
272 if (!isr || !notify) {
273 dev_err(&pci_dev->dev,
274 "virtio_pci: missing capabilities %i/%i/%i\n",
275 common, isr, notify);
276 return -EINVAL;
277 }
278
279 err = dma_set_mask_and_coherent(dev: &pci_dev->dev,
280 mask: mdev->dma_mask ? : DMA_BIT_MASK(64));
281 if (err)
282 err = dma_set_mask_and_coherent(dev: &pci_dev->dev,
283 DMA_BIT_MASK(32));
284 if (err)
285 dev_warn(&pci_dev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n");
286
287 /* Device capability is only mandatory for devices that have
288 * device-specific configuration.
289 */
290 device = virtio_pci_find_capability(dev: pci_dev, VIRTIO_PCI_CAP_DEVICE_CFG,
291 IORESOURCE_IO | IORESOURCE_MEM,
292 bars: &mdev->modern_bars);
293
294 err = pci_request_selected_regions(pci_dev, mdev->modern_bars,
295 "virtio-pci-modern");
296 if (err)
297 return err;
298
299 err = -EINVAL;
300 mdev->common = vp_modern_map_capability(mdev, off: common,
301 minlen: sizeof(struct virtio_pci_common_cfg), align: 4, start: 0,
302 offsetofend(struct virtio_pci_modern_common_cfg,
303 admin_queue_num),
304 len: &mdev->common_len, NULL);
305 if (!mdev->common)
306 goto err_map_common;
307 mdev->isr = vp_modern_map_capability(mdev, off: isr, minlen: sizeof(u8), align: 1,
308 start: 0, size: 1,
309 NULL, NULL);
310 if (!mdev->isr)
311 goto err_map_isr;
312
313 /* Read notify_off_multiplier from config space. */
314 pci_read_config_dword(dev: pci_dev,
315 where: notify + offsetof(struct virtio_pci_notify_cap,
316 notify_off_multiplier),
317 val: &mdev->notify_offset_multiplier);
318 /* Read notify length and offset from config space. */
319 pci_read_config_dword(dev: pci_dev,
320 where: notify + offsetof(struct virtio_pci_notify_cap,
321 cap.length),
322 val: &notify_length);
323
324 pci_read_config_dword(dev: pci_dev,
325 where: notify + offsetof(struct virtio_pci_notify_cap,
326 cap.offset),
327 val: &notify_offset);
328
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.
332 */
333 if ((u64)notify_length + (notify_offset % PAGE_SIZE) <= PAGE_SIZE) {
334 mdev->notify_base = vp_modern_map_capability(mdev, off: notify,
335 minlen: 2, align: 2,
336 start: 0, size: notify_length,
337 len: &mdev->notify_len,
338 pa: &mdev->notify_pa);
339 if (!mdev->notify_base)
340 goto err_map_notify;
341 } else {
342 mdev->notify_map_cap = notify;
343 }
344
345 /* Again, we don't know how much we should map, but PAGE_SIZE
346 * is more than enough for all existing devices.
347 */
348 if (device) {
349 mdev->device = vp_modern_map_capability(mdev, off: device, minlen: 0, align: 4,
350 start: 0, PAGE_SIZE,
351 len: &mdev->device_len,
352 NULL);
353 if (!mdev->device)
354 goto err_map_device;
355 }
356
357 return 0;
358
359err_map_device:
360 if (mdev->notify_base)
361 pci_iounmap(dev: pci_dev, mdev->notify_base);
362err_map_notify:
363 pci_iounmap(dev: pci_dev, mdev->isr);
364err_map_isr:
365 pci_iounmap(dev: pci_dev, mdev->common);
366err_map_common:
367 pci_release_selected_regions(pci_dev, mdev->modern_bars);
368 return err;
369}
370EXPORT_SYMBOL_GPL(vp_modern_probe);
371
372/*
373 * vp_modern_remove: remove and cleanup the modern virtio pci device
374 * @mdev: the modern virtio-pci device
375 */
376void vp_modern_remove(struct virtio_pci_modern_device *mdev)
377{
378 struct pci_dev *pci_dev = mdev->pci_dev;
379
380 if (mdev->device)
381 pci_iounmap(dev: pci_dev, mdev->device);
382 if (mdev->notify_base)
383 pci_iounmap(dev: pci_dev, mdev->notify_base);
384 pci_iounmap(dev: pci_dev, mdev->isr);
385 pci_iounmap(dev: pci_dev, mdev->common);
386 pci_release_selected_regions(pci_dev, mdev->modern_bars);
387}
388EXPORT_SYMBOL_GPL(vp_modern_remove);
389
390/*
391 * vp_modern_get_extended_features - get features from device
392 * @mdev: the modern virtio-pci device
393 * @features: the features array to be filled
394 *
395 * Fill the specified features array with the features read from the device
396 */
397void vp_modern_get_extended_features(struct virtio_pci_modern_device *mdev,
398 u64 *features)
399{
400 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
401 int i;
402
403 virtio_features_zero(features);
404 for (i = 0; i < VIRTIO_FEATURES_WORDS; i++) {
405 u64 cur;
406
407 vp_iowrite32(value: i, addr: &cfg->device_feature_select);
408 cur = vp_ioread32(addr: &cfg->device_feature);
409 features[i >> 1] |= cur << (32 * (i & 1));
410 }
411}
412EXPORT_SYMBOL_GPL(vp_modern_get_extended_features);
413
414/*
415 * vp_modern_get_driver_features - get driver features from device
416 * @mdev: the modern virtio-pci device
417 * @features: the features array to be filled
418 *
419 * Fill the specified features array with the driver features read from the
420 * device
421 */
422void
423vp_modern_get_driver_extended_features(struct virtio_pci_modern_device *mdev,
424 u64 *features)
425{
426 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
427 int i;
428
429 virtio_features_zero(features);
430 for (i = 0; i < VIRTIO_FEATURES_WORDS; i++) {
431 u64 cur;
432
433 vp_iowrite32(value: i, addr: &cfg->guest_feature_select);
434 cur = vp_ioread32(addr: &cfg->guest_feature);
435 features[i >> 1] |= cur << (32 * (i & 1));
436 }
437}
438EXPORT_SYMBOL_GPL(vp_modern_get_driver_extended_features);
439
440/*
441 * vp_modern_set_extended_features - set features to device
442 * @mdev: the modern virtio-pci device
443 * @features: the features set to device
444 */
445void vp_modern_set_extended_features(struct virtio_pci_modern_device *mdev,
446 const u64 *features)
447{
448 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
449 int i;
450
451 for (i = 0; i < VIRTIO_FEATURES_WORDS; i++) {
452 u32 cur = features[i >> 1] >> (32 * (i & 1));
453
454 vp_iowrite32(value: i, addr: &cfg->guest_feature_select);
455 vp_iowrite32(value: cur, addr: &cfg->guest_feature);
456 }
457}
458EXPORT_SYMBOL_GPL(vp_modern_set_extended_features);
459
460/*
461 * vp_modern_generation - get the device genreation
462 * @mdev: the modern virtio-pci device
463 *
464 * Returns the genreation read from device
465 */
466u32 vp_modern_generation(struct virtio_pci_modern_device *mdev)
467{
468 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
469
470 return vp_ioread8(addr: &cfg->config_generation);
471}
472EXPORT_SYMBOL_GPL(vp_modern_generation);
473
474/*
475 * vp_modern_get_status - get the device status
476 * @mdev: the modern virtio-pci device
477 *
478 * Returns the status read from device
479 */
480u8 vp_modern_get_status(struct virtio_pci_modern_device *mdev)
481{
482 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
483
484 return vp_ioread8(addr: &cfg->device_status);
485}
486EXPORT_SYMBOL_GPL(vp_modern_get_status);
487
488/*
489 * vp_modern_set_status - set status to device
490 * @mdev: the modern virtio-pci device
491 * @status: the status set to device
492 */
493void vp_modern_set_status(struct virtio_pci_modern_device *mdev,
494 u8 status)
495{
496 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
497
498 /*
499 * Per memory-barriers.txt, wmb() is not needed to guarantee
500 * that the cache coherent memory writes have completed
501 * before writing to the MMIO region.
502 */
503 vp_iowrite8(value: status, addr: &cfg->device_status);
504}
505EXPORT_SYMBOL_GPL(vp_modern_set_status);
506
507/*
508 * vp_modern_get_queue_reset - get the queue reset status
509 * @mdev: the modern virtio-pci device
510 * @index: queue index
511 */
512int vp_modern_get_queue_reset(struct virtio_pci_modern_device *mdev, u16 index)
513{
514 struct virtio_pci_modern_common_cfg __iomem *cfg;
515
516 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common;
517
518 vp_iowrite16(value: index, addr: &cfg->cfg.queue_select);
519 return vp_ioread16(addr: &cfg->queue_reset);
520}
521EXPORT_SYMBOL_GPL(vp_modern_get_queue_reset);
522
523/*
524 * vp_modern_set_queue_reset - reset the queue
525 * @mdev: the modern virtio-pci device
526 * @index: queue index
527 */
528void vp_modern_set_queue_reset(struct virtio_pci_modern_device *mdev, u16 index)
529{
530 struct virtio_pci_modern_common_cfg __iomem *cfg;
531
532 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common;
533
534 vp_iowrite16(value: index, addr: &cfg->cfg.queue_select);
535 vp_iowrite16(value: 1, addr: &cfg->queue_reset);
536
537 while (vp_ioread16(addr: &cfg->queue_reset))
538 msleep(msecs: 1);
539
540 while (vp_ioread16(addr: &cfg->cfg.queue_enable))
541 msleep(msecs: 1);
542}
543EXPORT_SYMBOL_GPL(vp_modern_set_queue_reset);
544
545/*
546 * vp_modern_queue_vector - set the MSIX vector for a specific virtqueue
547 * @mdev: the modern virtio-pci device
548 * @index: queue index
549 * @vector: the queue vector
550 *
551 * Returns the queue vector read from the device
552 */
553u16 vp_modern_queue_vector(struct virtio_pci_modern_device *mdev,
554 u16 index, u16 vector)
555{
556 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
557
558 vp_iowrite16(value: index, addr: &cfg->queue_select);
559 vp_iowrite16(value: vector, addr: &cfg->queue_msix_vector);
560 /* Flush the write out to device */
561 return vp_ioread16(addr: &cfg->queue_msix_vector);
562}
563EXPORT_SYMBOL_GPL(vp_modern_queue_vector);
564
565/*
566 * vp_modern_config_vector - set the vector for config interrupt
567 * @mdev: the modern virtio-pci device
568 * @vector: the config vector
569 *
570 * Returns the config vector read from the device
571 */
572u16 vp_modern_config_vector(struct virtio_pci_modern_device *mdev,
573 u16 vector)
574{
575 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
576
577 /* Setup the vector used for configuration events */
578 vp_iowrite16(value: vector, addr: &cfg->msix_config);
579 /* Verify we had enough resources to assign the vector */
580 /* Will also flush the write out to device */
581 return vp_ioread16(addr: &cfg->msix_config);
582}
583EXPORT_SYMBOL_GPL(vp_modern_config_vector);
584
585/*
586 * vp_modern_queue_address - set the virtqueue address
587 * @mdev: the modern virtio-pci device
588 * @index: the queue index
589 * @desc_addr: address of the descriptor area
590 * @driver_addr: address of the driver area
591 * @device_addr: address of the device area
592 */
593void vp_modern_queue_address(struct virtio_pci_modern_device *mdev,
594 u16 index, u64 desc_addr, u64 driver_addr,
595 u64 device_addr)
596{
597 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
598
599 vp_iowrite16(value: index, addr: &cfg->queue_select);
600
601 vp_iowrite64_twopart(val: desc_addr, lo: &cfg->queue_desc_lo,
602 hi: &cfg->queue_desc_hi);
603 vp_iowrite64_twopart(val: driver_addr, lo: &cfg->queue_avail_lo,
604 hi: &cfg->queue_avail_hi);
605 vp_iowrite64_twopart(val: device_addr, lo: &cfg->queue_used_lo,
606 hi: &cfg->queue_used_hi);
607}
608EXPORT_SYMBOL_GPL(vp_modern_queue_address);
609
610/*
611 * vp_modern_set_queue_enable - enable a virtqueue
612 * @mdev: the modern virtio-pci device
613 * @index: the queue index
614 * @enable: whether the virtqueue is enable or not
615 */
616void vp_modern_set_queue_enable(struct virtio_pci_modern_device *mdev,
617 u16 index, bool enable)
618{
619 vp_iowrite16(value: index, addr: &mdev->common->queue_select);
620 vp_iowrite16(value: enable, addr: &mdev->common->queue_enable);
621}
622EXPORT_SYMBOL_GPL(vp_modern_set_queue_enable);
623
624/*
625 * vp_modern_get_queue_enable - enable a virtqueue
626 * @mdev: the modern virtio-pci device
627 * @index: the queue index
628 *
629 * Returns whether a virtqueue is enabled or not
630 */
631bool vp_modern_get_queue_enable(struct virtio_pci_modern_device *mdev,
632 u16 index)
633{
634 vp_iowrite16(value: index, addr: &mdev->common->queue_select);
635
636 return vp_ioread16(addr: &mdev->common->queue_enable);
637}
638EXPORT_SYMBOL_GPL(vp_modern_get_queue_enable);
639
640/*
641 * vp_modern_set_queue_size - set size for a virtqueue
642 * @mdev: the modern virtio-pci device
643 * @index: the queue index
644 * @size: the size of the virtqueue
645 */
646void vp_modern_set_queue_size(struct virtio_pci_modern_device *mdev,
647 u16 index, u16 size)
648{
649 vp_iowrite16(value: index, addr: &mdev->common->queue_select);
650 vp_iowrite16(value: size, addr: &mdev->common->queue_size);
651
652}
653EXPORT_SYMBOL_GPL(vp_modern_set_queue_size);
654
655/*
656 * vp_modern_get_queue_size - get size for a virtqueue
657 * @mdev: the modern virtio-pci device
658 * @index: the queue index
659 *
660 * Returns the size of the virtqueue
661 */
662u16 vp_modern_get_queue_size(struct virtio_pci_modern_device *mdev,
663 u16 index)
664{
665 vp_iowrite16(value: index, addr: &mdev->common->queue_select);
666
667 return vp_ioread16(addr: &mdev->common->queue_size);
668
669}
670EXPORT_SYMBOL_GPL(vp_modern_get_queue_size);
671
672/*
673 * vp_modern_get_num_queues - get the number of virtqueues
674 * @mdev: the modern virtio-pci device
675 *
676 * Returns the number of virtqueues
677 */
678u16 vp_modern_get_num_queues(struct virtio_pci_modern_device *mdev)
679{
680 return vp_ioread16(addr: &mdev->common->num_queues);
681}
682EXPORT_SYMBOL_GPL(vp_modern_get_num_queues);
683
684/*
685 * vp_modern_get_queue_notify_off - get notification offset for a virtqueue
686 * @mdev: the modern virtio-pci device
687 * @index: the queue index
688 *
689 * Returns the notification offset for a virtqueue
690 */
691static u16 vp_modern_get_queue_notify_off(struct virtio_pci_modern_device *mdev,
692 u16 index)
693{
694 vp_iowrite16(value: index, addr: &mdev->common->queue_select);
695
696 return vp_ioread16(addr: &mdev->common->queue_notify_off);
697}
698
699/*
700 * vp_modern_map_vq_notify - map notification area for a
701 * specific virtqueue
702 * @mdev: the modern virtio-pci device
703 * @index: the queue index
704 * @pa: the pointer to the physical address of the nofity area
705 *
706 * Returns the address of the notification area
707 */
708void __iomem *vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev,
709 u16 index, resource_size_t *pa)
710{
711 u16 off = vp_modern_get_queue_notify_off(mdev, index);
712
713 if (mdev->notify_base) {
714 /* offset should not wrap */
715 if ((u64)off * mdev->notify_offset_multiplier + 2
716 > mdev->notify_len) {
717 dev_warn(&mdev->pci_dev->dev,
718 "bad notification offset %u (x %u) "
719 "for queue %u > %zd",
720 off, mdev->notify_offset_multiplier,
721 index, mdev->notify_len);
722 return NULL;
723 }
724 if (pa)
725 *pa = mdev->notify_pa +
726 off * mdev->notify_offset_multiplier;
727 return mdev->notify_base + off * mdev->notify_offset_multiplier;
728 } else {
729 return vp_modern_map_capability(mdev,
730 off: mdev->notify_map_cap, minlen: 2, align: 2,
731 start: off * mdev->notify_offset_multiplier, size: 2,
732 NULL, pa);
733 }
734}
735EXPORT_SYMBOL_GPL(vp_modern_map_vq_notify);
736
737u16 vp_modern_avq_num(struct virtio_pci_modern_device *mdev)
738{
739 struct virtio_pci_modern_common_cfg __iomem *cfg;
740
741 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common;
742 return vp_ioread16(addr: &cfg->admin_queue_num);
743}
744EXPORT_SYMBOL_GPL(vp_modern_avq_num);
745
746u16 vp_modern_avq_index(struct virtio_pci_modern_device *mdev)
747{
748 struct virtio_pci_modern_common_cfg __iomem *cfg;
749
750 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common;
751 return vp_ioread16(addr: &cfg->admin_queue_index);
752}
753EXPORT_SYMBOL_GPL(vp_modern_avq_index);
754
755MODULE_VERSION("0.1");
756MODULE_DESCRIPTION("Modern Virtio PCI Device");
757MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>");
758MODULE_LICENSE("GPL");
759