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 */
21 static void __iomem *
vp_modern_map_capability(struct virtio_pci_modern_device * mdev,int off,size_t minlen,u32 align,u32 start,u32 size,size_t * len,resource_size_t * pa)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)
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, off + offsetof(struct virtio_pci_cap,
32 bar),
33 &bar);
34 pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, offset),
35 &offset);
36 pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, length),
37 &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, 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 */
virtio_pci_find_capability(struct pci_dev * dev,u8 cfg_type,u32 ioresource_types,int * bars)114 static 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, pos + offsetof(struct virtio_pci_cap,
124 cfg_type),
125 &type);
126 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
127 bar),
128 &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. */
check_offsets(void)146 static 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 }
207
208 /*
209 * vp_modern_probe: probe the modern virtio pci device, note that the
210 * caller is required to enable PCI device before calling this function.
211 * @mdev: the modern virtio-pci device
212 *
213 * Return 0 on succeed otherwise fail
214 */
vp_modern_probe(struct virtio_pci_modern_device * mdev)215 int vp_modern_probe(struct virtio_pci_modern_device *mdev)
216 {
217 struct pci_dev *pci_dev = mdev->pci_dev;
218 int err, common, isr, notify, device;
219 u32 notify_length;
220 u32 notify_offset;
221 int devid;
222
223 check_offsets();
224
225 if (mdev->device_id_check) {
226 devid = mdev->device_id_check(pci_dev);
227 if (devid < 0)
228 return devid;
229 mdev->id.device = devid;
230 } else {
231 /* We only own devices >= 0x1000 and <= 0x107f: leave the rest. */
232 if (pci_dev->device < 0x1000 || pci_dev->device > 0x107f)
233 return -ENODEV;
234
235 if (pci_dev->device < 0x1040) {
236 /* Transitional devices: use the PCI subsystem device id as
237 * virtio device id, same as legacy driver always did.
238 */
239 mdev->id.device = pci_dev->subsystem_device;
240 } else {
241 /* Modern devices: simply use PCI device id, but start from 0x1040. */
242 mdev->id.device = pci_dev->device - 0x1040;
243 }
244 }
245 mdev->id.vendor = pci_dev->subsystem_vendor;
246
247 /* check for a common config: if not, use legacy mode (bar 0). */
248 common = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_COMMON_CFG,
249 IORESOURCE_IO | IORESOURCE_MEM,
250 &mdev->modern_bars);
251 if (!common) {
252 dev_info(&pci_dev->dev,
253 "virtio_pci: leaving for legacy driver\n");
254 return -ENODEV;
255 }
256
257 /* If common is there, these should be too... */
258 isr = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_ISR_CFG,
259 IORESOURCE_IO | IORESOURCE_MEM,
260 &mdev->modern_bars);
261 notify = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_NOTIFY_CFG,
262 IORESOURCE_IO | IORESOURCE_MEM,
263 &mdev->modern_bars);
264 if (!isr || !notify) {
265 dev_err(&pci_dev->dev,
266 "virtio_pci: missing capabilities %i/%i/%i\n",
267 common, isr, notify);
268 return -EINVAL;
269 }
270
271 err = dma_set_mask_and_coherent(&pci_dev->dev,
272 mdev->dma_mask ? : DMA_BIT_MASK(64));
273 if (err)
274 err = dma_set_mask_and_coherent(&pci_dev->dev,
275 DMA_BIT_MASK(32));
276 if (err)
277 dev_warn(&pci_dev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n");
278
279 /* Device capability is only mandatory for devices that have
280 * device-specific configuration.
281 */
282 device = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_DEVICE_CFG,
283 IORESOURCE_IO | IORESOURCE_MEM,
284 &mdev->modern_bars);
285
286 err = pci_request_selected_regions(pci_dev, mdev->modern_bars,
287 "virtio-pci-modern");
288 if (err)
289 return err;
290
291 err = -EINVAL;
292 mdev->common = vp_modern_map_capability(mdev, common,
293 sizeof(struct virtio_pci_common_cfg), 4,
294 0, sizeof(struct virtio_pci_modern_common_cfg),
295 NULL, NULL);
296 if (!mdev->common)
297 goto err_map_common;
298 mdev->isr = vp_modern_map_capability(mdev, isr, sizeof(u8), 1,
299 0, 1,
300 NULL, NULL);
301 if (!mdev->isr)
302 goto err_map_isr;
303
304 /* Read notify_off_multiplier from config space. */
305 pci_read_config_dword(pci_dev,
306 notify + offsetof(struct virtio_pci_notify_cap,
307 notify_off_multiplier),
308 &mdev->notify_offset_multiplier);
309 /* Read notify length and offset from config space. */
310 pci_read_config_dword(pci_dev,
311 notify + offsetof(struct virtio_pci_notify_cap,
312 cap.length),
313 ¬ify_length);
314
315 pci_read_config_dword(pci_dev,
316 notify + offsetof(struct virtio_pci_notify_cap,
317 cap.offset),
318 ¬ify_offset);
319
320 /* We don't know how many VQs we'll map, ahead of the time.
321 * If notify length is small, map it all now.
322 * Otherwise, map each VQ individually later.
323 */
324 if ((u64)notify_length + (notify_offset % PAGE_SIZE) <= PAGE_SIZE) {
325 mdev->notify_base = vp_modern_map_capability(mdev, notify,
326 2, 2,
327 0, notify_length,
328 &mdev->notify_len,
329 &mdev->notify_pa);
330 if (!mdev->notify_base)
331 goto err_map_notify;
332 } else {
333 mdev->notify_map_cap = notify;
334 }
335
336 /* Again, we don't know how much we should map, but PAGE_SIZE
337 * is more than enough for all existing devices.
338 */
339 if (device) {
340 mdev->device = vp_modern_map_capability(mdev, device, 0, 4,
341 0, PAGE_SIZE,
342 &mdev->device_len,
343 NULL);
344 if (!mdev->device)
345 goto err_map_device;
346 }
347
348 return 0;
349
350 err_map_device:
351 if (mdev->notify_base)
352 pci_iounmap(pci_dev, mdev->notify_base);
353 err_map_notify:
354 pci_iounmap(pci_dev, mdev->isr);
355 err_map_isr:
356 pci_iounmap(pci_dev, mdev->common);
357 err_map_common:
358 pci_release_selected_regions(pci_dev, mdev->modern_bars);
359 return err;
360 }
361 EXPORT_SYMBOL_GPL(vp_modern_probe);
362
363 /*
364 * vp_modern_remove: remove and cleanup the modern virtio pci device
365 * @mdev: the modern virtio-pci device
366 */
vp_modern_remove(struct virtio_pci_modern_device * mdev)367 void vp_modern_remove(struct virtio_pci_modern_device *mdev)
368 {
369 struct pci_dev *pci_dev = mdev->pci_dev;
370
371 if (mdev->device)
372 pci_iounmap(pci_dev, mdev->device);
373 if (mdev->notify_base)
374 pci_iounmap(pci_dev, mdev->notify_base);
375 pci_iounmap(pci_dev, mdev->isr);
376 pci_iounmap(pci_dev, mdev->common);
377 pci_release_selected_regions(pci_dev, mdev->modern_bars);
378 }
379 EXPORT_SYMBOL_GPL(vp_modern_remove);
380
381 /*
382 * vp_modern_get_features - get features from device
383 * @mdev: the modern virtio-pci device
384 *
385 * Returns the features read from the device
386 */
vp_modern_get_features(struct virtio_pci_modern_device * mdev)387 u64 vp_modern_get_features(struct virtio_pci_modern_device *mdev)
388 {
389 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
390
391 u64 features;
392
393 vp_iowrite32(0, &cfg->device_feature_select);
394 features = vp_ioread32(&cfg->device_feature);
395 vp_iowrite32(1, &cfg->device_feature_select);
396 features |= ((u64)vp_ioread32(&cfg->device_feature) << 32);
397
398 return features;
399 }
400 EXPORT_SYMBOL_GPL(vp_modern_get_features);
401
402 /*
403 * vp_modern_get_driver_features - get driver features from device
404 * @mdev: the modern virtio-pci device
405 *
406 * Returns the driver features read from the device
407 */
vp_modern_get_driver_features(struct virtio_pci_modern_device * mdev)408 u64 vp_modern_get_driver_features(struct virtio_pci_modern_device *mdev)
409 {
410 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
411
412 u64 features;
413
414 vp_iowrite32(0, &cfg->guest_feature_select);
415 features = vp_ioread32(&cfg->guest_feature);
416 vp_iowrite32(1, &cfg->guest_feature_select);
417 features |= ((u64)vp_ioread32(&cfg->guest_feature) << 32);
418
419 return features;
420 }
421 EXPORT_SYMBOL_GPL(vp_modern_get_driver_features);
422
423 /*
424 * vp_modern_set_features - set features to device
425 * @mdev: the modern virtio-pci device
426 * @features: the features set to device
427 */
vp_modern_set_features(struct virtio_pci_modern_device * mdev,u64 features)428 void vp_modern_set_features(struct virtio_pci_modern_device *mdev,
429 u64 features)
430 {
431 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
432
433 vp_iowrite32(0, &cfg->guest_feature_select);
434 vp_iowrite32((u32)features, &cfg->guest_feature);
435 vp_iowrite32(1, &cfg->guest_feature_select);
436 vp_iowrite32(features >> 32, &cfg->guest_feature);
437 }
438 EXPORT_SYMBOL_GPL(vp_modern_set_features);
439
440 /*
441 * vp_modern_generation - get the device genreation
442 * @mdev: the modern virtio-pci device
443 *
444 * Returns the genreation read from device
445 */
vp_modern_generation(struct virtio_pci_modern_device * mdev)446 u32 vp_modern_generation(struct virtio_pci_modern_device *mdev)
447 {
448 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
449
450 return vp_ioread8(&cfg->config_generation);
451 }
452 EXPORT_SYMBOL_GPL(vp_modern_generation);
453
454 /*
455 * vp_modern_get_status - get the device status
456 * @mdev: the modern virtio-pci device
457 *
458 * Returns the status read from device
459 */
vp_modern_get_status(struct virtio_pci_modern_device * mdev)460 u8 vp_modern_get_status(struct virtio_pci_modern_device *mdev)
461 {
462 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
463
464 return vp_ioread8(&cfg->device_status);
465 }
466 EXPORT_SYMBOL_GPL(vp_modern_get_status);
467
468 /*
469 * vp_modern_set_status - set status to device
470 * @mdev: the modern virtio-pci device
471 * @status: the status set to device
472 */
vp_modern_set_status(struct virtio_pci_modern_device * mdev,u8 status)473 void vp_modern_set_status(struct virtio_pci_modern_device *mdev,
474 u8 status)
475 {
476 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
477
478 /*
479 * Per memory-barriers.txt, wmb() is not needed to guarantee
480 * that the cache coherent memory writes have completed
481 * before writing to the MMIO region.
482 */
483 vp_iowrite8(status, &cfg->device_status);
484 }
485 EXPORT_SYMBOL_GPL(vp_modern_set_status);
486
487 /*
488 * vp_modern_get_queue_reset - get the queue reset status
489 * @mdev: the modern virtio-pci device
490 * @index: queue index
491 */
vp_modern_get_queue_reset(struct virtio_pci_modern_device * mdev,u16 index)492 int vp_modern_get_queue_reset(struct virtio_pci_modern_device *mdev, u16 index)
493 {
494 struct virtio_pci_modern_common_cfg __iomem *cfg;
495
496 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common;
497
498 vp_iowrite16(index, &cfg->cfg.queue_select);
499 return vp_ioread16(&cfg->queue_reset);
500 }
501 EXPORT_SYMBOL_GPL(vp_modern_get_queue_reset);
502
503 /*
504 * vp_modern_set_queue_reset - reset the queue
505 * @mdev: the modern virtio-pci device
506 * @index: queue index
507 */
vp_modern_set_queue_reset(struct virtio_pci_modern_device * mdev,u16 index)508 void vp_modern_set_queue_reset(struct virtio_pci_modern_device *mdev, u16 index)
509 {
510 struct virtio_pci_modern_common_cfg __iomem *cfg;
511
512 cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common;
513
514 vp_iowrite16(index, &cfg->cfg.queue_select);
515 vp_iowrite16(1, &cfg->queue_reset);
516
517 while (vp_ioread16(&cfg->queue_reset))
518 msleep(1);
519
520 while (vp_ioread16(&cfg->cfg.queue_enable))
521 msleep(1);
522 }
523 EXPORT_SYMBOL_GPL(vp_modern_set_queue_reset);
524
525 /*
526 * vp_modern_queue_vector - set the MSIX vector for a specific virtqueue
527 * @mdev: the modern virtio-pci device
528 * @index: queue index
529 * @vector: the config vector
530 *
531 * Returns the config vector read from the device
532 */
vp_modern_queue_vector(struct virtio_pci_modern_device * mdev,u16 index,u16 vector)533 u16 vp_modern_queue_vector(struct virtio_pci_modern_device *mdev,
534 u16 index, u16 vector)
535 {
536 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
537
538 vp_iowrite16(index, &cfg->queue_select);
539 vp_iowrite16(vector, &cfg->queue_msix_vector);
540 /* Flush the write out to device */
541 return vp_ioread16(&cfg->queue_msix_vector);
542 }
543 EXPORT_SYMBOL_GPL(vp_modern_queue_vector);
544
545 /*
546 * vp_modern_config_vector - set the vector for config interrupt
547 * @mdev: the modern virtio-pci device
548 * @vector: the config vector
549 *
550 * Returns the config vector read from the device
551 */
vp_modern_config_vector(struct virtio_pci_modern_device * mdev,u16 vector)552 u16 vp_modern_config_vector(struct virtio_pci_modern_device *mdev,
553 u16 vector)
554 {
555 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
556
557 /* Setup the vector used for configuration events */
558 vp_iowrite16(vector, &cfg->msix_config);
559 /* Verify we had enough resources to assign the vector */
560 /* Will also flush the write out to device */
561 return vp_ioread16(&cfg->msix_config);
562 }
563 EXPORT_SYMBOL_GPL(vp_modern_config_vector);
564
565 /*
566 * vp_modern_queue_address - set the virtqueue address
567 * @mdev: the modern virtio-pci device
568 * @index: the queue index
569 * @desc_addr: address of the descriptor area
570 * @driver_addr: address of the driver area
571 * @device_addr: address of the device area
572 */
vp_modern_queue_address(struct virtio_pci_modern_device * mdev,u16 index,u64 desc_addr,u64 driver_addr,u64 device_addr)573 void vp_modern_queue_address(struct virtio_pci_modern_device *mdev,
574 u16 index, u64 desc_addr, u64 driver_addr,
575 u64 device_addr)
576 {
577 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
578
579 vp_iowrite16(index, &cfg->queue_select);
580
581 vp_iowrite64_twopart(desc_addr, &cfg->queue_desc_lo,
582 &cfg->queue_desc_hi);
583 vp_iowrite64_twopart(driver_addr, &cfg->queue_avail_lo,
584 &cfg->queue_avail_hi);
585 vp_iowrite64_twopart(device_addr, &cfg->queue_used_lo,
586 &cfg->queue_used_hi);
587 }
588 EXPORT_SYMBOL_GPL(vp_modern_queue_address);
589
590 /*
591 * vp_modern_set_queue_enable - enable a virtqueue
592 * @mdev: the modern virtio-pci device
593 * @index: the queue index
594 * @enable: whether the virtqueue is enable or not
595 */
vp_modern_set_queue_enable(struct virtio_pci_modern_device * mdev,u16 index,bool enable)596 void vp_modern_set_queue_enable(struct virtio_pci_modern_device *mdev,
597 u16 index, bool enable)
598 {
599 vp_iowrite16(index, &mdev->common->queue_select);
600 vp_iowrite16(enable, &mdev->common->queue_enable);
601 }
602 EXPORT_SYMBOL_GPL(vp_modern_set_queue_enable);
603
604 /*
605 * vp_modern_get_queue_enable - enable a virtqueue
606 * @mdev: the modern virtio-pci device
607 * @index: the queue index
608 *
609 * Returns whether a virtqueue is enabled or not
610 */
vp_modern_get_queue_enable(struct virtio_pci_modern_device * mdev,u16 index)611 bool vp_modern_get_queue_enable(struct virtio_pci_modern_device *mdev,
612 u16 index)
613 {
614 vp_iowrite16(index, &mdev->common->queue_select);
615
616 return vp_ioread16(&mdev->common->queue_enable);
617 }
618 EXPORT_SYMBOL_GPL(vp_modern_get_queue_enable);
619
620 /*
621 * vp_modern_set_queue_size - set size for a virtqueue
622 * @mdev: the modern virtio-pci device
623 * @index: the queue index
624 * @size: the size of the virtqueue
625 */
vp_modern_set_queue_size(struct virtio_pci_modern_device * mdev,u16 index,u16 size)626 void vp_modern_set_queue_size(struct virtio_pci_modern_device *mdev,
627 u16 index, u16 size)
628 {
629 vp_iowrite16(index, &mdev->common->queue_select);
630 vp_iowrite16(size, &mdev->common->queue_size);
631
632 }
633 EXPORT_SYMBOL_GPL(vp_modern_set_queue_size);
634
635 /*
636 * vp_modern_get_queue_size - get size for a virtqueue
637 * @mdev: the modern virtio-pci device
638 * @index: the queue index
639 *
640 * Returns the size of the virtqueue
641 */
vp_modern_get_queue_size(struct virtio_pci_modern_device * mdev,u16 index)642 u16 vp_modern_get_queue_size(struct virtio_pci_modern_device *mdev,
643 u16 index)
644 {
645 vp_iowrite16(index, &mdev->common->queue_select);
646
647 return vp_ioread16(&mdev->common->queue_size);
648
649 }
650 EXPORT_SYMBOL_GPL(vp_modern_get_queue_size);
651
652 /*
653 * vp_modern_get_num_queues - get the number of virtqueues
654 * @mdev: the modern virtio-pci device
655 *
656 * Returns the number of virtqueues
657 */
vp_modern_get_num_queues(struct virtio_pci_modern_device * mdev)658 u16 vp_modern_get_num_queues(struct virtio_pci_modern_device *mdev)
659 {
660 return vp_ioread16(&mdev->common->num_queues);
661 }
662 EXPORT_SYMBOL_GPL(vp_modern_get_num_queues);
663
664 /*
665 * vp_modern_get_queue_notify_off - get notification offset for a virtqueue
666 * @mdev: the modern virtio-pci device
667 * @index: the queue index
668 *
669 * Returns the notification offset for a virtqueue
670 */
vp_modern_get_queue_notify_off(struct virtio_pci_modern_device * mdev,u16 index)671 static u16 vp_modern_get_queue_notify_off(struct virtio_pci_modern_device *mdev,
672 u16 index)
673 {
674 vp_iowrite16(index, &mdev->common->queue_select);
675
676 return vp_ioread16(&mdev->common->queue_notify_off);
677 }
678
679 /*
680 * vp_modern_map_vq_notify - map notification area for a
681 * specific virtqueue
682 * @mdev: the modern virtio-pci device
683 * @index: the queue index
684 * @pa: the pointer to the physical address of the nofity area
685 *
686 * Returns the address of the notification area
687 */
vp_modern_map_vq_notify(struct virtio_pci_modern_device * mdev,u16 index,resource_size_t * pa)688 void __iomem *vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev,
689 u16 index, resource_size_t *pa)
690 {
691 u16 off = vp_modern_get_queue_notify_off(mdev, index);
692
693 if (mdev->notify_base) {
694 /* offset should not wrap */
695 if ((u64)off * mdev->notify_offset_multiplier + 2
696 > mdev->notify_len) {
697 dev_warn(&mdev->pci_dev->dev,
698 "bad notification offset %u (x %u) "
699 "for queue %u > %zd",
700 off, mdev->notify_offset_multiplier,
701 index, mdev->notify_len);
702 return NULL;
703 }
704 if (pa)
705 *pa = mdev->notify_pa +
706 off * mdev->notify_offset_multiplier;
707 return mdev->notify_base + off * mdev->notify_offset_multiplier;
708 } else {
709 return vp_modern_map_capability(mdev,
710 mdev->notify_map_cap, 2, 2,
711 off * mdev->notify_offset_multiplier, 2,
712 NULL, pa);
713 }
714 }
715 EXPORT_SYMBOL_GPL(vp_modern_map_vq_notify);
716
717 MODULE_VERSION("0.1");
718 MODULE_DESCRIPTION("Modern Virtio PCI Device");
719 MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>");
720 MODULE_LICENSE("GPL");
721