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Merge series "Use raw spinlocks in the ls-extirq driver" from Vladimir Oltean <vladim...
[linux-2.6-block.git] / drivers / virtio / virtio_pci_modern_dev.c
CommitLineData
fd502729
JW		 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
7/*
8 * vp_modern_map_capability - map a part of virtio pci capability
9 * @mdev: the modern virtio-pci device
10 * @off: offset of the capability
11 * @minlen: minimal length of the capability
12 * @align: align requirement
13 * @start: start from the capability
14 * @size: map size
15 * @len: the length that is actually mapped
9e311bca 16 * @pa: physical address of the capability
fd502729
JW		 17 *
18 * Returns the io address of for the part of the capability
19 */
fd466b36
JW		 20static void __iomem *
21vp_modern_map_capability(struct virtio_pci_modern_device *mdev, int off,
22 size_t minlen, u32 align, u32 start, u32 size,
9e311bca 23 size_t *len, resource_size_t *pa)
fd502729
JW		 24{
25 struct pci_dev *dev = mdev->pci_dev;
26 u8 bar;
27 u32 offset, length;
28 void __iomem *p;
29
30 pci_read_config_byte(dev, off + offsetof(struct virtio_pci_cap,
31 bar),
32 &bar);
33 pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, offset),
34 &offset);
35 pci_read_config_dword(dev, off + offsetof(struct virtio_pci_cap, length),
36 &length);
37
38 if (length <= start) {
39 dev_err(&dev->dev,
40 "virtio_pci: bad capability len %u (>%u expected)\n",
41 length, start);
42 return NULL;
43 }
44
45 if (length - start < minlen) {
46 dev_err(&dev->dev,
47 "virtio_pci: bad capability len %u (>=%zu expected)\n",
48 length, minlen);
49 return NULL;
50 }
51
52 length -= start;
53
54 if (start + offset < offset) {
55 dev_err(&dev->dev,
56 "virtio_pci: map wrap-around %u+%u\n",
57 start, offset);
58 return NULL;
59 }
60
61 offset += start;
62
63 if (offset & (align - 1)) {
64 dev_err(&dev->dev,
65 "virtio_pci: offset %u not aligned to %u\n",
66 offset, align);
67 return NULL;
68 }
69
70 if (length > size)
71 length = size;
72
73 if (len)
74 *len = length;
75
76 if (minlen + offset < minlen ||
77 minlen + offset > pci_resource_len(dev, bar)) {
78 dev_err(&dev->dev,
79 "virtio_pci: map virtio %zu@%u "
80 "out of range on bar %i length %lu\n",
81 minlen, offset,
82 bar, (unsigned long)pci_resource_len(dev, bar));
83 return NULL;
84 }
85
86 p = pci_iomap_range(dev, bar, offset, length);
87 if (!p)
88 dev_err(&dev->dev,
89 "virtio_pci: unable to map virtio %u@%u on bar %i\n",
90 length, offset, bar);
9e311bca
JW		 91 else if (pa)
92 *pa = pci_resource_start(dev, bar) + offset;
93
fd502729
JW		 94 return p;
95}
fd502729
JW		 96
97/**
98 * virtio_pci_find_capability - walk capabilities to find device info.
99 * @dev: the pci device
100 * @cfg_type: the VIRTIO_PCI_CAP_* value we seek
101 * @ioresource_types: IORESOURCE_MEM and/or IORESOURCE_IO.
102 * @bars: the bitmask of BARs
103 *
104 * Returns offset of the capability, or 0.
105 */
106static inline int virtio_pci_find_capability(struct pci_dev *dev, u8 cfg_type,
107 u32 ioresource_types, int *bars)
108{
109 int pos;
110
111 for (pos = pci_find_capability(dev, PCI_CAP_ID_VNDR);
112 pos > 0;
113 pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_VNDR)) {
114 u8 type, bar;
115 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
116 cfg_type),
117 &type);
118 pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
119 bar),
120 &bar);
121
122 /* Ignore structures with reserved BAR values */
123 if (bar > 0x5)
124 continue;
125
126 if (type == cfg_type) {
127 if (pci_resource_len(dev, bar) &&
128 pci_resource_flags(dev, bar) & ioresource_types) {
129 *bars |= (1 << bar);
130 return pos;
131 }
132 }
133 }
134 return 0;
135}
136
137/* This is part of the ABI. Don't screw with it. */
138static inline void check_offsets(void)
139{
140 /* Note: disk space was harmed in compilation of this function. */
141 BUILD_BUG_ON(VIRTIO_PCI_CAP_VNDR !=
142 offsetof(struct virtio_pci_cap, cap_vndr));
143 BUILD_BUG_ON(VIRTIO_PCI_CAP_NEXT !=
144 offsetof(struct virtio_pci_cap, cap_next));
145 BUILD_BUG_ON(VIRTIO_PCI_CAP_LEN !=
146 offsetof(struct virtio_pci_cap, cap_len));
147 BUILD_BUG_ON(VIRTIO_PCI_CAP_CFG_TYPE !=
148 offsetof(struct virtio_pci_cap, cfg_type));
149 BUILD_BUG_ON(VIRTIO_PCI_CAP_BAR !=
150 offsetof(struct virtio_pci_cap, bar));
151 BUILD_BUG_ON(VIRTIO_PCI_CAP_OFFSET !=
152 offsetof(struct virtio_pci_cap, offset));
153 BUILD_BUG_ON(VIRTIO_PCI_CAP_LENGTH !=
154 offsetof(struct virtio_pci_cap, length));
155 BUILD_BUG_ON(VIRTIO_PCI_NOTIFY_CAP_MULT !=
156 offsetof(struct virtio_pci_notify_cap,
157 notify_off_multiplier));
158 BUILD_BUG_ON(VIRTIO_PCI_COMMON_DFSELECT !=
159 offsetof(struct virtio_pci_common_cfg,
160 device_feature_select));
161 BUILD_BUG_ON(VIRTIO_PCI_COMMON_DF !=
162 offsetof(struct virtio_pci_common_cfg, device_feature));
163 BUILD_BUG_ON(VIRTIO_PCI_COMMON_GFSELECT !=
164 offsetof(struct virtio_pci_common_cfg,
165 guest_feature_select));
166 BUILD_BUG_ON(VIRTIO_PCI_COMMON_GF !=
167 offsetof(struct virtio_pci_common_cfg, guest_feature));
168 BUILD_BUG_ON(VIRTIO_PCI_COMMON_MSIX !=
169 offsetof(struct virtio_pci_common_cfg, msix_config));
170 BUILD_BUG_ON(VIRTIO_PCI_COMMON_NUMQ !=
171 offsetof(struct virtio_pci_common_cfg, num_queues));
172 BUILD_BUG_ON(VIRTIO_PCI_COMMON_STATUS !=
173 offsetof(struct virtio_pci_common_cfg, device_status));
174 BUILD_BUG_ON(VIRTIO_PCI_COMMON_CFGGENERATION !=
175 offsetof(struct virtio_pci_common_cfg, config_generation));
176 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SELECT !=
177 offsetof(struct virtio_pci_common_cfg, queue_select));
178 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_SIZE !=
179 offsetof(struct virtio_pci_common_cfg, queue_size));
180 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_MSIX !=
181 offsetof(struct virtio_pci_common_cfg, queue_msix_vector));
182 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_ENABLE !=
183 offsetof(struct virtio_pci_common_cfg, queue_enable));
184 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_NOFF !=
185 offsetof(struct virtio_pci_common_cfg, queue_notify_off));
186 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCLO !=
187 offsetof(struct virtio_pci_common_cfg, queue_desc_lo));
188 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_DESCHI !=
189 offsetof(struct virtio_pci_common_cfg, queue_desc_hi));
190 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILLO !=
191 offsetof(struct virtio_pci_common_cfg, queue_avail_lo));
192 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_AVAILHI !=
193 offsetof(struct virtio_pci_common_cfg, queue_avail_hi));
194 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDLO !=
195 offsetof(struct virtio_pci_common_cfg, queue_used_lo));
196 BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDHI !=
197 offsetof(struct virtio_pci_common_cfg, queue_used_hi));
198}
199
200/*
201 * vp_modern_probe: probe the modern virtio pci device, note that the
202 * caller is required to enable PCI device before calling this function.
203 * @mdev: the modern virtio-pci device
204 *
205 * Return 0 on succeed otherwise fail
206 */
207int vp_modern_probe(struct virtio_pci_modern_device *mdev)
208{
209 struct pci_dev *pci_dev = mdev->pci_dev;
210 int err, common, isr, notify, device;
211 u32 notify_length;
212 u32 notify_offset;
213
214 check_offsets();
215
216 mdev->pci_dev = pci_dev;
217
218 /* We only own devices >= 0x1000 and <= 0x107f: leave the rest. */
219 if (pci_dev->device < 0x1000 || pci_dev->device > 0x107f)
220 return -ENODEV;
221
222 if (pci_dev->device < 0x1040) {
223 /* Transitional devices: use the PCI subsystem device id as
224 * virtio device id, same as legacy driver always did.
225 */
226 mdev->id.device = pci_dev->subsystem_device;
227 } else {
228 /* Modern devices: simply use PCI device id, but start from 0x1040. */
229 mdev->id.device = pci_dev->device - 0x1040;
230 }
231 mdev->id.vendor = pci_dev->subsystem_vendor;
232
233 /* check for a common config: if not, use legacy mode (bar 0). */
234 common = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_COMMON_CFG,
235 IORESOURCE_IO | IORESOURCE_MEM,
236 &mdev->modern_bars);
237 if (!common) {
238 dev_info(&pci_dev->dev,
239 "virtio_pci: leaving for legacy driver\n");
240 return -ENODEV;
241 }
242
243 /* If common is there, these should be too... */
244 isr = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_ISR_CFG,
245 IORESOURCE_IO | IORESOURCE_MEM,
246 &mdev->modern_bars);
247 notify = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_NOTIFY_CFG,
248 IORESOURCE_IO | IORESOURCE_MEM,
249 &mdev->modern_bars);
250 if (!isr || !notify) {
251 dev_err(&pci_dev->dev,
252 "virtio_pci: missing capabilities %i/%i/%i\n",
253 common, isr, notify);
254 return -EINVAL;
255 }
256
257 err = dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(64));
258 if (err)
259 err = dma_set_mask_and_coherent(&pci_dev->dev,
260 DMA_BIT_MASK(32));
261 if (err)
262 dev_warn(&pci_dev->dev, "Failed to enable 64-bit or 32-bit DMA. Trying to continue, but this might not work.\n");
263
264 /* Device capability is only mandatory for devices that have
265 * device-specific configuration.
266 */
267 device = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_DEVICE_CFG,
268 IORESOURCE_IO | IORESOURCE_MEM,
269 &mdev->modern_bars);
270
271 err = pci_request_selected_regions(pci_dev, mdev->modern_bars,
272 "virtio-pci-modern");
273 if (err)
274 return err;
275
276 err = -EINVAL;
277 mdev->common = vp_modern_map_capability(mdev, common,
278 sizeof(struct virtio_pci_common_cfg), 4,
279 0, sizeof(struct virtio_pci_common_cfg),
9e311bca 280 NULL, NULL);
fd502729
JW		 281 if (!mdev->common)
282 goto err_map_common;
283 mdev->isr = vp_modern_map_capability(mdev, isr, sizeof(u8), 1,
284 0, 1,
9e311bca 285 NULL, NULL);
fd502729
JW		 286 if (!mdev->isr)
287 goto err_map_isr;
288
289 /* Read notify_off_multiplier from config space. */
290 pci_read_config_dword(pci_dev,
291 notify + offsetof(struct virtio_pci_notify_cap,
292 notify_off_multiplier),
293 &mdev->notify_offset_multiplier);
294 /* Read notify length and offset from config space. */
295 pci_read_config_dword(pci_dev,
296 notify + offsetof(struct virtio_pci_notify_cap,
297 cap.length),
298 &notify_length);
299
300 pci_read_config_dword(pci_dev,
301 notify + offsetof(struct virtio_pci_notify_cap,
302 cap.offset),
303 &notify_offset);
304
305 /* We don't know how many VQs we'll map, ahead of the time.
306 * If notify length is small, map it all now.
307 * Otherwise, map each VQ individually later.
308 */
309 if ((u64)notify_length + (notify_offset % PAGE_SIZE) <= PAGE_SIZE) {
310 mdev->notify_base = vp_modern_map_capability(mdev, notify,
311 2, 2,
312 0, notify_length,
9e311bca
JW		 313 &mdev->notify_len,
314 &mdev->notify_pa);
fd502729
JW		 315 if (!mdev->notify_base)
316 goto err_map_notify;
317 } else {
318 mdev->notify_map_cap = notify;
319 }
320
321 /* Again, we don't know how much we should map, but PAGE_SIZE
322 * is more than enough for all existing devices.
323 */
324 if (device) {
325 mdev->device = vp_modern_map_capability(mdev, device, 0, 4,
326 0, PAGE_SIZE,
9e311bca
JW		 327 &mdev->device_len,
328 NULL);
fd502729
JW		 329 if (!mdev->device)
330 goto err_map_device;
331 }
332
333 return 0;
334
335err_map_device:
336 if (mdev->notify_base)
337 pci_iounmap(pci_dev, mdev->notify_base);
338err_map_notify:
339 pci_iounmap(pci_dev, mdev->isr);
340err_map_isr:
341 pci_iounmap(pci_dev, mdev->common);
342err_map_common:
343 return err;
344}
345EXPORT_SYMBOL_GPL(vp_modern_probe);
346
347/*
348 * vp_modern_probe: remove and cleanup the modern virtio pci device
349 * @mdev: the modern virtio-pci device
350 */
351void vp_modern_remove(struct virtio_pci_modern_device *mdev)
352{
353 struct pci_dev *pci_dev = mdev->pci_dev;
354
355 if (mdev->device)
356 pci_iounmap(pci_dev, mdev->device);
357 if (mdev->notify_base)
358 pci_iounmap(pci_dev, mdev->notify_base);
359 pci_iounmap(pci_dev, mdev->isr);
360 pci_iounmap(pci_dev, mdev->common);
361 pci_release_selected_regions(pci_dev, mdev->modern_bars);
362}
363EXPORT_SYMBOL_GPL(vp_modern_remove);
364
365/*
366 * vp_modern_get_features - get features from device
367 * @mdev: the modern virtio-pci device
368 *
369 * Returns the features read from the device
370 */
371u64 vp_modern_get_features(struct virtio_pci_modern_device *mdev)
372{
373 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
374
375 u64 features;
376
377 vp_iowrite32(0, &cfg->device_feature_select);
378 features = vp_ioread32(&cfg->device_feature);
379 vp_iowrite32(1, &cfg->device_feature_select);
380 features |= ((u64)vp_ioread32(&cfg->device_feature) << 32);
381
382 return features;
383}
384EXPORT_SYMBOL_GPL(vp_modern_get_features);
385
0140b3d0
JW		 386/*
387 * vp_modern_get_driver_features - get driver features from device
388 * @mdev: the modern virtio-pci device
389 *
390 * Returns the driver features read from the device
391 */
392u64 vp_modern_get_driver_features(struct virtio_pci_modern_device *mdev)
393{
394 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
395
396 u64 features;
397
398 vp_iowrite32(0, &cfg->guest_feature_select);
399 features = vp_ioread32(&cfg->guest_feature);
400 vp_iowrite32(1, &cfg->guest_feature_select);
401 features |= ((u64)vp_ioread32(&cfg->guest_feature) << 32);
402
403 return features;
404}
405EXPORT_SYMBOL_GPL(vp_modern_get_driver_features);
406
fd502729
JW		 407/*
408 * vp_modern_set_features - set features to device
409 * @mdev: the modern virtio-pci device
410 * @features: the features set to device
411 */
412void vp_modern_set_features(struct virtio_pci_modern_device *mdev,
413 u64 features)
414{
415 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
416
417 vp_iowrite32(0, &cfg->guest_feature_select);
418 vp_iowrite32((u32)features, &cfg->guest_feature);
419 vp_iowrite32(1, &cfg->guest_feature_select);
420 vp_iowrite32(features >> 32, &cfg->guest_feature);
421}
422EXPORT_SYMBOL_GPL(vp_modern_set_features);
423
424/*
425 * vp_modern_generation - get the device genreation
426 * @mdev: the modern virtio-pci device
427 *
428 * Returns the genreation read from device
429 */
430u32 vp_modern_generation(struct virtio_pci_modern_device *mdev)
431{
432 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
433
434 return vp_ioread8(&cfg->config_generation);
435}
436EXPORT_SYMBOL_GPL(vp_modern_generation);
437
438/*
439 * vp_modern_get_status - get the device status
440 * @mdev: the modern virtio-pci device
441 *
442 * Returns the status read from device
443 */
444u8 vp_modern_get_status(struct virtio_pci_modern_device *mdev)
445{
446 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
447
448 return vp_ioread8(&cfg->device_status);
449}
450EXPORT_SYMBOL_GPL(vp_modern_get_status);
451
452/*
453 * vp_modern_set_status - set status to device
454 * @mdev: the modern virtio-pci device
455 * @status: the status set to device
456 */
457void vp_modern_set_status(struct virtio_pci_modern_device *mdev,
458 u8 status)
459{
460 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
461
462 vp_iowrite8(status, &cfg->device_status);
463}
464EXPORT_SYMBOL_GPL(vp_modern_set_status);
465
466/*
467 * vp_modern_queue_vector - set the MSIX vector for a specific virtqueue
468 * @mdev: the modern virtio-pci device
469 * @index: queue index
470 * @vector: the config vector
471 *
472 * Returns the config vector read from the device
473 */
474u16 vp_modern_queue_vector(struct virtio_pci_modern_device *mdev,
475 u16 index, u16 vector)
476{
477 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
478
479 vp_iowrite16(index, &cfg->queue_select);
480 vp_iowrite16(vector, &cfg->queue_msix_vector);
481 /* Flush the write out to device */
482 return vp_ioread16(&cfg->queue_msix_vector);
483}
484EXPORT_SYMBOL_GPL(vp_modern_queue_vector);
485
486/*
487 * vp_modern_config_vector - set the vector for config interrupt
488 * @mdev: the modern virtio-pci device
489 * @vector: the config vector
490 *
491 * Returns the config vector read from the device
492 */
493u16 vp_modern_config_vector(struct virtio_pci_modern_device *mdev,
494 u16 vector)
495{
496 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
497
498 /* Setup the vector used for configuration events */
499 vp_iowrite16(vector, &cfg->msix_config);
500 /* Verify we had enough resources to assign the vector */
501 /* Will also flush the write out to device */
502 return vp_ioread16(&cfg->msix_config);
503}
504EXPORT_SYMBOL_GPL(vp_modern_config_vector);
505
506/*
507 * vp_modern_queue_address - set the virtqueue address
508 * @mdev: the modern virtio-pci device
509 * @index: the queue index
510 * @desc_addr: address of the descriptor area
511 * @driver_addr: address of the driver area
512 * @device_addr: address of the device area
513 */
514void vp_modern_queue_address(struct virtio_pci_modern_device *mdev,
515 u16 index, u64 desc_addr, u64 driver_addr,
516 u64 device_addr)
517{
518 struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
519
520 vp_iowrite16(index, &cfg->queue_select);
521
522 vp_iowrite64_twopart(desc_addr, &cfg->queue_desc_lo,
523 &cfg->queue_desc_hi);
524 vp_iowrite64_twopart(driver_addr, &cfg->queue_avail_lo,
525 &cfg->queue_avail_hi);
526 vp_iowrite64_twopart(device_addr, &cfg->queue_used_lo,
527 &cfg->queue_used_hi);
528}
529EXPORT_SYMBOL_GPL(vp_modern_queue_address);
530
531/*
532 * vp_modern_set_queue_enable - enable a virtqueue
533 * @mdev: the modern virtio-pci device
534 * @index: the queue index
535 * @enable: whether the virtqueue is enable or not
536 */
537void vp_modern_set_queue_enable(struct virtio_pci_modern_device *mdev,
538 u16 index, bool enable)
539{
540 vp_iowrite16(index, &mdev->common->queue_select);
541 vp_iowrite16(enable, &mdev->common->queue_enable);
542}
543EXPORT_SYMBOL_GPL(vp_modern_set_queue_enable);
544
545/*
546 * vp_modern_get_queue_enable - enable a virtqueue
547 * @mdev: the modern virtio-pci device
548 * @index: the queue index
549 *
550 * Returns whether a virtqueue is enabled or not
551 */
552bool vp_modern_get_queue_enable(struct virtio_pci_modern_device *mdev,
553 u16 index)
554{
555 vp_iowrite16(index, &mdev->common->queue_select);
556
557 return vp_ioread16(&mdev->common->queue_enable);
558}
559EXPORT_SYMBOL_GPL(vp_modern_get_queue_enable);
560
561/*
562 * vp_modern_set_queue_size - set size for a virtqueue
563 * @mdev: the modern virtio-pci device
564 * @index: the queue index
565 * @size: the size of the virtqueue
566 */
567void vp_modern_set_queue_size(struct virtio_pci_modern_device *mdev,
568 u16 index, u16 size)
569{
570 vp_iowrite16(index, &mdev->common->queue_select);
571 vp_iowrite16(size, &mdev->common->queue_size);
572
573}
574EXPORT_SYMBOL_GPL(vp_modern_set_queue_size);
575
576/*
577 * vp_modern_get_queue_size - get size for a virtqueue
578 * @mdev: the modern virtio-pci device
579 * @index: the queue index
580 *
581 * Returns the size of the virtqueue
582 */
583u16 vp_modern_get_queue_size(struct virtio_pci_modern_device *mdev,
584 u16 index)
585{
586 vp_iowrite16(index, &mdev->common->queue_select);
587
588 return vp_ioread16(&mdev->common->queue_size);
589
590}
591EXPORT_SYMBOL_GPL(vp_modern_get_queue_size);
592
593/*
594 * vp_modern_get_num_queues - get the number of virtqueues
595 * @mdev: the modern virtio-pci device
596 *
597 * Returns the number of virtqueues
598 */
599u16 vp_modern_get_num_queues(struct virtio_pci_modern_device *mdev)
600{
601 return vp_ioread16(&mdev->common->num_queues);
602}
603EXPORT_SYMBOL_GPL(vp_modern_get_num_queues);
604
605/*
606 * vp_modern_get_queue_notify_off - get notification offset for a virtqueue
607 * @mdev: the modern virtio-pci device
608 * @index: the queue index
609 *
610 * Returns the notification offset for a virtqueue
611 */
a5f7a24f
JW		 612static u16 vp_modern_get_queue_notify_off(struct virtio_pci_modern_device *mdev,
613 u16 index)
fd502729
JW		 614{
615 vp_iowrite16(index, &mdev->common->queue_select);
616
617 return vp_ioread16(&mdev->common->queue_notify_off);
618}
fd502729 619
9e3bb9b7
JW		 620/*
621 * vp_modern_map_vq_notify - map notification area for a
622 * specific virtqueue
623 * @mdev: the modern virtio-pci device
624 * @index: the queue index
9e311bca 625 * @pa: the pointer to the physical address of the nofity area
9e3bb9b7
JW		 626 *
627 * Returns the address of the notification area
628 */
d7bce85a
MT		 629void __iomem *vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev,
630 u16 index, resource_size_t *pa)
9e3bb9b7
JW		 631{
632 u16 off = vp_modern_get_queue_notify_off(mdev, index);
633
634 if (mdev->notify_base) {
635 /* offset should not wrap */
636 if ((u64)off * mdev->notify_offset_multiplier + 2
637 > mdev->notify_len) {
638 dev_warn(&mdev->pci_dev->dev,
639 "bad notification offset %u (x %u) "
640 "for queue %u > %zd",
641 off, mdev->notify_offset_multiplier,
642 index, mdev->notify_len);
643 return NULL;
644 }
9e311bca
JW		 645 if (pa)
646 *pa = mdev->notify_pa +
647 off * mdev->notify_offset_multiplier;
d7bce85a 648 return mdev->notify_base + off * mdev->notify_offset_multiplier;
9e3bb9b7 649 } else {
d7bce85a 650 return vp_modern_map_capability(mdev,
9e3bb9b7
JW		 651 mdev->notify_map_cap, 2, 2,
652 off * mdev->notify_offset_multiplier, 2,
9e311bca 653 NULL, pa);
9e3bb9b7
JW		 654 }
655}
656EXPORT_SYMBOL_GPL(vp_modern_map_vq_notify);
657
fd502729
JW		 658MODULE_VERSION("0.1");
659MODULE_DESCRIPTION("Modern Virtio PCI Device");
660MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>");
661MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)