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1.1 root 1: /*
2: * Virtio Support
3: *
4: * Copyright IBM, Corp. 2007
5: *
6: * Authors:
7: * Anthony Liguori <[email protected]>
8: *
9: * This work is licensed under the terms of the GNU GPL, version 2. See
10: * the COPYING file in the top-level directory.
11: *
12: */
13:
14: #include <inttypes.h>
15:
16: #include "virtio.h"
17: #include "sysemu.h"
18:
19: //#define VIRTIO_ZERO_COPY
20:
21: /* from Linux's linux/virtio_pci.h */
22:
23: /* A 32-bit r/o bitmask of the features supported by the host */
24: #define VIRTIO_PCI_HOST_FEATURES 0
25:
26: /* A 32-bit r/w bitmask of features activated by the guest */
27: #define VIRTIO_PCI_GUEST_FEATURES 4
28:
29: /* A 32-bit r/w PFN for the currently selected queue */
30: #define VIRTIO_PCI_QUEUE_PFN 8
31:
32: /* A 16-bit r/o queue size for the currently selected queue */
33: #define VIRTIO_PCI_QUEUE_NUM 12
34:
35: /* A 16-bit r/w queue selector */
36: #define VIRTIO_PCI_QUEUE_SEL 14
37:
38: /* A 16-bit r/w queue notifier */
39: #define VIRTIO_PCI_QUEUE_NOTIFY 16
40:
41: /* An 8-bit device status register. */
42: #define VIRTIO_PCI_STATUS 18
43:
44: /* An 8-bit r/o interrupt status register. Reading the value will return the
45: * current contents of the ISR and will also clear it. This is effectively
46: * a read-and-acknowledge. */
47: #define VIRTIO_PCI_ISR 19
48:
49: #define VIRTIO_PCI_CONFIG 20
50:
51: /* Virtio ABI version, if we increment this, we break the guest driver. */
52: #define VIRTIO_PCI_ABI_VERSION 0
53:
54: /* How many bits to shift physical queue address written to QUEUE_PFN.
55: * 12 is historical, and due to x86 page size. */
56: #define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12
57:
58: /* The alignment to use between consumer and producer parts of vring.
59: * x86 pagesize again. */
60: #define VIRTIO_PCI_VRING_ALIGN 4096
61:
62: /* QEMU doesn't strictly need write barriers since everything runs in
63: * lock-step. We'll leave the calls to wmb() in though to make it obvious for
64: * KVM or if kqemu gets SMP support.
65: */
66: #define wmb() do { } while (0)
67:
68: typedef struct VRingDesc
69: {
70: uint64_t addr;
71: uint32_t len;
72: uint16_t flags;
73: uint16_t next;
74: } VRingDesc;
75:
76: typedef struct VRingAvail
77: {
78: uint16_t flags;
79: uint16_t idx;
80: uint16_t ring[0];
81: } VRingAvail;
82:
83: typedef struct VRingUsedElem
84: {
85: uint32_t id;
86: uint32_t len;
87: } VRingUsedElem;
88:
89: typedef struct VRingUsed
90: {
91: uint16_t flags;
92: uint16_t idx;
93: VRingUsedElem ring[0];
94: } VRingUsed;
95:
96: typedef struct VRing
97: {
98: unsigned int num;
99: target_phys_addr_t desc;
100: target_phys_addr_t avail;
101: target_phys_addr_t used;
102: } VRing;
103:
104: struct VirtQueue
105: {
106: VRing vring;
107: uint32_t pfn;
108: uint16_t last_avail_idx;
109: int inuse;
110: void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
111: };
112:
113: #define VIRTIO_PCI_QUEUE_MAX 16
114:
115: /* virt queue functions */
116: #ifdef VIRTIO_ZERO_COPY
117: static void *virtio_map_gpa(target_phys_addr_t addr, size_t size)
118: {
119: ram_addr_t off;
120: target_phys_addr_t addr1;
121:
122: off = cpu_get_physical_page_desc(addr);
123: if ((off & ~TARGET_PAGE_MASK) != IO_MEM_RAM) {
124: fprintf(stderr, "virtio DMA to IO ram\n");
125: exit(1);
126: }
127:
128: off = (off & TARGET_PAGE_MASK) | (addr & ~TARGET_PAGE_MASK);
129:
130: for (addr1 = addr + TARGET_PAGE_SIZE;
131: addr1 < TARGET_PAGE_ALIGN(addr + size);
132: addr1 += TARGET_PAGE_SIZE) {
133: ram_addr_t off1;
134:
135: off1 = cpu_get_physical_page_desc(addr1);
136: if ((off1 & ~TARGET_PAGE_MASK) != IO_MEM_RAM) {
137: fprintf(stderr, "virtio DMA to IO ram\n");
138: exit(1);
139: }
140:
141: off1 = (off1 & TARGET_PAGE_MASK) | (addr1 & ~TARGET_PAGE_MASK);
142:
143: if (off1 != (off + (addr1 - addr))) {
144: fprintf(stderr, "discontigous virtio memory\n");
145: exit(1);
146: }
147: }
148:
149: return phys_ram_base + off;
150: }
151: #endif
152:
153: static void virtqueue_init(VirtQueue *vq, target_phys_addr_t pa)
154: {
155: vq->vring.desc = pa;
156: vq->vring.avail = pa + vq->vring.num * sizeof(VRingDesc);
157: vq->vring.used = vring_align(vq->vring.avail +
158: offsetof(VRingAvail, ring[vq->vring.num]),
159: VIRTIO_PCI_VRING_ALIGN);
160: }
161:
162: static inline uint64_t vring_desc_addr(VirtQueue *vq, int i)
163: {
164: target_phys_addr_t pa;
165: pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, addr);
166: return ldq_phys(pa);
167: }
168:
169: static inline uint32_t vring_desc_len(VirtQueue *vq, int i)
170: {
171: target_phys_addr_t pa;
172: pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, len);
173: return ldl_phys(pa);
174: }
175:
176: static inline uint16_t vring_desc_flags(VirtQueue *vq, int i)
177: {
178: target_phys_addr_t pa;
179: pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, flags);
180: return lduw_phys(pa);
181: }
182:
183: static inline uint16_t vring_desc_next(VirtQueue *vq, int i)
184: {
185: target_phys_addr_t pa;
186: pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, next);
187: return lduw_phys(pa);
188: }
189:
190: static inline uint16_t vring_avail_flags(VirtQueue *vq)
191: {
192: target_phys_addr_t pa;
193: pa = vq->vring.avail + offsetof(VRingAvail, flags);
194: return lduw_phys(pa);
195: }
196:
197: static inline uint16_t vring_avail_idx(VirtQueue *vq)
198: {
199: target_phys_addr_t pa;
200: pa = vq->vring.avail + offsetof(VRingAvail, idx);
201: return lduw_phys(pa);
202: }
203:
204: static inline uint16_t vring_avail_ring(VirtQueue *vq, int i)
205: {
206: target_phys_addr_t pa;
207: pa = vq->vring.avail + offsetof(VRingAvail, ring[i]);
208: return lduw_phys(pa);
209: }
210:
211: static inline void vring_used_ring_id(VirtQueue *vq, int i, uint32_t val)
212: {
213: target_phys_addr_t pa;
214: pa = vq->vring.used + offsetof(VRingUsed, ring[i].id);
215: stl_phys(pa, val);
216: }
217:
218: static inline void vring_used_ring_len(VirtQueue *vq, int i, uint32_t val)
219: {
220: target_phys_addr_t pa;
221: pa = vq->vring.used + offsetof(VRingUsed, ring[i].len);
222: stl_phys(pa, val);
223: }
224:
225: static uint16_t vring_used_idx(VirtQueue *vq)
226: {
227: target_phys_addr_t pa;
228: pa = vq->vring.used + offsetof(VRingUsed, idx);
229: return lduw_phys(pa);
230: }
231:
232: static inline void vring_used_idx_increment(VirtQueue *vq, uint16_t val)
233: {
234: target_phys_addr_t pa;
235: pa = vq->vring.used + offsetof(VRingUsed, idx);
236: stw_phys(pa, vring_used_idx(vq) + val);
237: }
238:
239: static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask)
240: {
241: target_phys_addr_t pa;
242: pa = vq->vring.used + offsetof(VRingUsed, flags);
243: stw_phys(pa, lduw_phys(pa) | mask);
244: }
245:
246: static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask)
247: {
248: target_phys_addr_t pa;
249: pa = vq->vring.used + offsetof(VRingUsed, flags);
250: stw_phys(pa, lduw_phys(pa) & ~mask);
251: }
252:
253: void virtio_queue_set_notification(VirtQueue *vq, int enable)
254: {
255: if (enable)
256: vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY);
257: else
258: vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY);
259: }
260:
261: int virtio_queue_ready(VirtQueue *vq)
262: {
263: return vq->vring.avail != 0;
264: }
265:
266: int virtio_queue_empty(VirtQueue *vq)
267: {
268: return vring_avail_idx(vq) == vq->last_avail_idx;
269: }
270:
271: void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
272: unsigned int len, unsigned int idx)
273: {
274: unsigned int offset;
275: int i;
276:
277: #ifndef VIRTIO_ZERO_COPY
278: for (i = 0; i < elem->out_num; i++)
279: qemu_free(elem->out_sg[i].iov_base);
280: #endif
281:
282: offset = 0;
283: for (i = 0; i < elem->in_num; i++) {
284: size_t size = MIN(len - offset, elem->in_sg[i].iov_len);
285:
286: #ifdef VIRTIO_ZERO_COPY
287: if (size) {
288: ram_addr_t addr = (uint8_t *)elem->in_sg[i].iov_base - phys_ram_base;
289: ram_addr_t off;
290:
291: for (off = 0; off < size; off += TARGET_PAGE_SIZE)
292: cpu_physical_memory_set_dirty(addr + off);
293: }
294: #else
295: if (size)
296: cpu_physical_memory_write(elem->in_addr[i],
297: elem->in_sg[i].iov_base,
298: size);
299:
300: qemu_free(elem->in_sg[i].iov_base);
301: #endif
302:
303: offset += size;
304: }
305:
306: idx = (idx + vring_used_idx(vq)) % vq->vring.num;
307:
308: /* Get a pointer to the next entry in the used ring. */
309: vring_used_ring_id(vq, idx, elem->index);
310: vring_used_ring_len(vq, idx, len);
311: }
312:
313: void virtqueue_flush(VirtQueue *vq, unsigned int count)
314: {
315: /* Make sure buffer is written before we update index. */
316: wmb();
317: vring_used_idx_increment(vq, count);
318: vq->inuse -= count;
319: }
320:
321: void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
322: unsigned int len)
323: {
324: virtqueue_fill(vq, elem, len, 0);
325: virtqueue_flush(vq, 1);
326: }
327:
328: static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx)
329: {
330: uint16_t num_heads = vring_avail_idx(vq) - idx;
331:
332: /* Check it isn't doing very strange things with descriptor numbers. */
333: if (num_heads > vq->vring.num) {
334: fprintf(stderr, "Guest moved used index from %u to %u",
335: idx, vring_avail_idx(vq));
336: exit(1);
337: }
338:
339: return num_heads;
340: }
341:
342: static unsigned int virtqueue_get_head(VirtQueue *vq, unsigned int idx)
343: {
344: unsigned int head;
345:
346: /* Grab the next descriptor number they're advertising, and increment
347: * the index we've seen. */
348: head = vring_avail_ring(vq, idx % vq->vring.num);
349:
350: /* If their number is silly, that's a fatal mistake. */
351: if (head >= vq->vring.num) {
352: fprintf(stderr, "Guest says index %u is available", head);
353: exit(1);
354: }
355:
356: return head;
357: }
358:
359: static unsigned virtqueue_next_desc(VirtQueue *vq, unsigned int i)
360: {
361: unsigned int next;
362:
363: /* If this descriptor says it doesn't chain, we're done. */
364: if (!(vring_desc_flags(vq, i) & VRING_DESC_F_NEXT))
365: return vq->vring.num;
366:
367: /* Check they're not leading us off end of descriptors. */
368: next = vring_desc_next(vq, i);
369: /* Make sure compiler knows to grab that: we don't want it changing! */
370: wmb();
371:
372: if (next >= vq->vring.num) {
373: fprintf(stderr, "Desc next is %u", next);
374: exit(1);
375: }
376:
377: return next;
378: }
379:
380: int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes)
381: {
382: unsigned int idx;
383: int num_bufs, in_total, out_total;
384:
385: idx = vq->last_avail_idx;
386:
387: num_bufs = in_total = out_total = 0;
388: while (virtqueue_num_heads(vq, idx)) {
389: int i;
390:
391: i = virtqueue_get_head(vq, idx++);
392: do {
393: /* If we've got too many, that implies a descriptor loop. */
394: if (++num_bufs > vq->vring.num) {
395: fprintf(stderr, "Looped descriptor");
396: exit(1);
397: }
398:
399: if (vring_desc_flags(vq, i) & VRING_DESC_F_WRITE) {
400: if (in_bytes > 0 &&
401: (in_total += vring_desc_len(vq, i)) >= in_bytes)
402: return 1;
403: } else {
404: if (out_bytes > 0 &&
405: (out_total += vring_desc_len(vq, i)) >= out_bytes)
406: return 1;
407: }
408: } while ((i = virtqueue_next_desc(vq, i)) != vq->vring.num);
409: }
410:
411: return 0;
412: }
413:
414: int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem)
415: {
416: unsigned int i, head;
417:
418: if (!virtqueue_num_heads(vq, vq->last_avail_idx))
419: return 0;
420:
421: /* When we start there are none of either input nor output. */
422: elem->out_num = elem->in_num = 0;
423:
424: i = head = virtqueue_get_head(vq, vq->last_avail_idx++);
425: do {
426: struct iovec *sg;
427:
428: if (vring_desc_flags(vq, i) & VRING_DESC_F_WRITE) {
429: elem->in_addr[elem->in_num] = vring_desc_addr(vq, i);
430: sg = &elem->in_sg[elem->in_num++];
431: } else
432: sg = &elem->out_sg[elem->out_num++];
433:
434: /* Grab the first descriptor, and check it's OK. */
435: sg->iov_len = vring_desc_len(vq, i);
436:
437: #ifdef VIRTIO_ZERO_COPY
438: sg->iov_base = virtio_map_gpa(vring_desc_addr(vq, i), sg->iov_len);
439: #else
440: /* cap individual scatter element size to prevent unbounded allocations
441: of memory from the guest. Practically speaking, no virtio driver
442: will ever pass more than a page in each element. We set the cap to
443: be 2MB in case for some reason a large page makes it way into the
444: sg list. When we implement a zero copy API, this limitation will
445: disappear */
446: if (sg->iov_len > (2 << 20))
447: sg->iov_len = 2 << 20;
448:
449: sg->iov_base = qemu_malloc(sg->iov_len);
450: if (!(vring_desc_flags(vq, i) & VRING_DESC_F_WRITE)) {
451: cpu_physical_memory_read(vring_desc_addr(vq, i),
452: sg->iov_base,
453: sg->iov_len);
454: }
455: #endif
456: if (sg->iov_base == NULL) {
457: fprintf(stderr, "Invalid mapping\n");
458: exit(1);
459: }
460:
461: /* If we've got too many, that implies a descriptor loop. */
462: if ((elem->in_num + elem->out_num) > vq->vring.num) {
463: fprintf(stderr, "Looped descriptor");
464: exit(1);
465: }
466: } while ((i = virtqueue_next_desc(vq, i)) != vq->vring.num);
467:
468: elem->index = head;
469:
470: vq->inuse++;
471:
472: return elem->in_num + elem->out_num;
473: }
474:
475: /* virtio device */
476:
477: static VirtIODevice *to_virtio_device(PCIDevice *pci_dev)
478: {
479: return (VirtIODevice *)pci_dev;
480: }
481:
482: static void virtio_update_irq(VirtIODevice *vdev)
483: {
484: qemu_set_irq(vdev->pci_dev.irq[0], vdev->isr & 1);
485: }
486:
487: static void virtio_reset(void *opaque)
488: {
489: VirtIODevice *vdev = opaque;
490: int i;
491:
492: if (vdev->reset)
493: vdev->reset(vdev);
494:
495: vdev->features = 0;
496: vdev->queue_sel = 0;
497: vdev->status = 0;
498: vdev->isr = 0;
499: virtio_update_irq(vdev);
500:
501: for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
502: vdev->vq[i].vring.desc = 0;
503: vdev->vq[i].vring.avail = 0;
504: vdev->vq[i].vring.used = 0;
505: vdev->vq[i].last_avail_idx = 0;
506: vdev->vq[i].pfn = 0;
507: }
508: }
509:
510: static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
511: {
512: VirtIODevice *vdev = to_virtio_device(opaque);
513: ram_addr_t pa;
514:
515: addr -= vdev->addr;
516:
517: switch (addr) {
518: case VIRTIO_PCI_GUEST_FEATURES:
519: if (vdev->set_features)
520: vdev->set_features(vdev, val);
521: vdev->features = val;
522: break;
523: case VIRTIO_PCI_QUEUE_PFN:
524: pa = (ram_addr_t)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
525: vdev->vq[vdev->queue_sel].pfn = val;
526: if (pa == 0) {
527: virtio_reset(vdev);
528: } else {
529: virtqueue_init(&vdev->vq[vdev->queue_sel], pa);
530: }
531: break;
532: case VIRTIO_PCI_QUEUE_SEL:
533: if (val < VIRTIO_PCI_QUEUE_MAX)
534: vdev->queue_sel = val;
535: break;
536: case VIRTIO_PCI_QUEUE_NOTIFY:
537: if (val < VIRTIO_PCI_QUEUE_MAX && vdev->vq[val].vring.desc)
538: vdev->vq[val].handle_output(vdev, &vdev->vq[val]);
539: break;
540: case VIRTIO_PCI_STATUS:
541: vdev->status = val & 0xFF;
542: if (vdev->status == 0)
543: virtio_reset(vdev);
544: break;
545: }
546: }
547:
548: static uint32_t virtio_ioport_read(void *opaque, uint32_t addr)
549: {
550: VirtIODevice *vdev = to_virtio_device(opaque);
551: uint32_t ret = 0xFFFFFFFF;
552:
553: addr -= vdev->addr;
554:
555: switch (addr) {
556: case VIRTIO_PCI_HOST_FEATURES:
557: ret = vdev->get_features(vdev);
558: ret |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY);
559: break;
560: case VIRTIO_PCI_GUEST_FEATURES:
561: ret = vdev->features;
562: break;
563: case VIRTIO_PCI_QUEUE_PFN:
564: ret = vdev->vq[vdev->queue_sel].pfn;
565: break;
566: case VIRTIO_PCI_QUEUE_NUM:
567: ret = vdev->vq[vdev->queue_sel].vring.num;
568: break;
569: case VIRTIO_PCI_QUEUE_SEL:
570: ret = vdev->queue_sel;
571: break;
572: case VIRTIO_PCI_STATUS:
573: ret = vdev->status;
574: break;
575: case VIRTIO_PCI_ISR:
576: /* reading from the ISR also clears it. */
577: ret = vdev->isr;
578: vdev->isr = 0;
579: virtio_update_irq(vdev);
580: break;
581: default:
582: break;
583: }
584:
585: return ret;
586: }
587:
588: static uint32_t virtio_config_readb(void *opaque, uint32_t addr)
589: {
590: VirtIODevice *vdev = opaque;
591: uint8_t val;
592:
593: vdev->get_config(vdev, vdev->config);
594:
595: addr -= vdev->addr + VIRTIO_PCI_CONFIG;
596: if (addr > (vdev->config_len - sizeof(val)))
597: return (uint32_t)-1;
598:
599: memcpy(&val, vdev->config + addr, sizeof(val));
600: return val;
601: }
602:
603: static uint32_t virtio_config_readw(void *opaque, uint32_t addr)
604: {
605: VirtIODevice *vdev = opaque;
606: uint16_t val;
607:
608: vdev->get_config(vdev, vdev->config);
609:
610: addr -= vdev->addr + VIRTIO_PCI_CONFIG;
611: if (addr > (vdev->config_len - sizeof(val)))
612: return (uint32_t)-1;
613:
614: memcpy(&val, vdev->config + addr, sizeof(val));
615: return val;
616: }
617:
618: static uint32_t virtio_config_readl(void *opaque, uint32_t addr)
619: {
620: VirtIODevice *vdev = opaque;
621: uint32_t val;
622:
623: vdev->get_config(vdev, vdev->config);
624:
625: addr -= vdev->addr + VIRTIO_PCI_CONFIG;
626: if (addr > (vdev->config_len - sizeof(val)))
627: return (uint32_t)-1;
628:
629: memcpy(&val, vdev->config + addr, sizeof(val));
630: return val;
631: }
632:
633: static void virtio_config_writeb(void *opaque, uint32_t addr, uint32_t data)
634: {
635: VirtIODevice *vdev = opaque;
636: uint8_t val = data;
637:
638: addr -= vdev->addr + VIRTIO_PCI_CONFIG;
639: if (addr > (vdev->config_len - sizeof(val)))
640: return;
641:
642: memcpy(vdev->config + addr, &val, sizeof(val));
643:
644: if (vdev->set_config)
645: vdev->set_config(vdev, vdev->config);
646: }
647:
648: static void virtio_config_writew(void *opaque, uint32_t addr, uint32_t data)
649: {
650: VirtIODevice *vdev = opaque;
651: uint16_t val = data;
652:
653: addr -= vdev->addr + VIRTIO_PCI_CONFIG;
654: if (addr > (vdev->config_len - sizeof(val)))
655: return;
656:
657: memcpy(vdev->config + addr, &val, sizeof(val));
658:
659: if (vdev->set_config)
660: vdev->set_config(vdev, vdev->config);
661: }
662:
663: static void virtio_config_writel(void *opaque, uint32_t addr, uint32_t data)
664: {
665: VirtIODevice *vdev = opaque;
666: uint32_t val = data;
667:
668: addr -= vdev->addr + VIRTIO_PCI_CONFIG;
669: if (addr > (vdev->config_len - sizeof(val)))
670: return;
671:
672: memcpy(vdev->config + addr, &val, sizeof(val));
673:
674: if (vdev->set_config)
675: vdev->set_config(vdev, vdev->config);
676: }
677:
678: static void virtio_map(PCIDevice *pci_dev, int region_num,
679: uint32_t addr, uint32_t size, int type)
680: {
681: VirtIODevice *vdev = to_virtio_device(pci_dev);
682: int i;
683:
684: vdev->addr = addr;
685: for (i = 0; i < 3; i++) {
686: register_ioport_write(addr, 20, 1 << i, virtio_ioport_write, vdev);
687: register_ioport_read(addr, 20, 1 << i, virtio_ioport_read, vdev);
688: }
689:
690: if (vdev->config_len) {
691: register_ioport_write(addr + 20, vdev->config_len, 1,
692: virtio_config_writeb, vdev);
693: register_ioport_write(addr + 20, vdev->config_len, 2,
694: virtio_config_writew, vdev);
695: register_ioport_write(addr + 20, vdev->config_len, 4,
696: virtio_config_writel, vdev);
697: register_ioport_read(addr + 20, vdev->config_len, 1,
698: virtio_config_readb, vdev);
699: register_ioport_read(addr + 20, vdev->config_len, 2,
700: virtio_config_readw, vdev);
701: register_ioport_read(addr + 20, vdev->config_len, 4,
702: virtio_config_readl, vdev);
703:
704: vdev->get_config(vdev, vdev->config);
705: }
706: }
707:
708: VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
709: void (*handle_output)(VirtIODevice *, VirtQueue *))
710: {
711: int i;
712:
713: for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
714: if (vdev->vq[i].vring.num == 0)
715: break;
716: }
717:
718: if (i == VIRTIO_PCI_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE)
719: abort();
720:
721: vdev->vq[i].vring.num = queue_size;
722: vdev->vq[i].handle_output = handle_output;
723:
724: return &vdev->vq[i];
725: }
726:
727: void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
728: {
729: /* Always notify when queue is empty */
730: if ((vq->inuse || vring_avail_idx(vq) != vq->last_avail_idx) &&
731: (vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT))
732: return;
733:
734: vdev->isr |= 0x01;
735: virtio_update_irq(vdev);
736: }
737:
738: void virtio_notify_config(VirtIODevice *vdev)
739: {
740: if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
741: return;
742:
743: vdev->isr |= 0x03;
744: virtio_update_irq(vdev);
745: }
746:
747: void virtio_save(VirtIODevice *vdev, QEMUFile *f)
748: {
749: int i;
750:
751: pci_device_save(&vdev->pci_dev, f);
752:
753: qemu_put_be32s(f, &vdev->addr);
754: qemu_put_8s(f, &vdev->status);
755: qemu_put_8s(f, &vdev->isr);
756: qemu_put_be16s(f, &vdev->queue_sel);
757: qemu_put_be32s(f, &vdev->features);
758: qemu_put_be32(f, vdev->config_len);
759: qemu_put_buffer(f, vdev->config, vdev->config_len);
760:
761: for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
762: if (vdev->vq[i].vring.num == 0)
763: break;
764: }
765:
766: qemu_put_be32(f, i);
767:
768: for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
769: if (vdev->vq[i].vring.num == 0)
770: break;
771:
772: qemu_put_be32(f, vdev->vq[i].vring.num);
773: qemu_put_be32s(f, &vdev->vq[i].pfn);
774: qemu_put_be16s(f, &vdev->vq[i].last_avail_idx);
775: }
776: }
777:
778: void virtio_load(VirtIODevice *vdev, QEMUFile *f)
779: {
780: int num, i;
781:
782: pci_device_load(&vdev->pci_dev, f);
783:
784: qemu_get_be32s(f, &vdev->addr);
785: qemu_get_8s(f, &vdev->status);
786: qemu_get_8s(f, &vdev->isr);
787: qemu_get_be16s(f, &vdev->queue_sel);
788: qemu_get_be32s(f, &vdev->features);
789: vdev->config_len = qemu_get_be32(f);
790: qemu_get_buffer(f, vdev->config, vdev->config_len);
791:
792: num = qemu_get_be32(f);
793:
794: for (i = 0; i < num; i++) {
795: vdev->vq[i].vring.num = qemu_get_be32(f);
796: qemu_get_be32s(f, &vdev->vq[i].pfn);
797: qemu_get_be16s(f, &vdev->vq[i].last_avail_idx);
798:
799: if (vdev->vq[i].pfn) {
800: target_phys_addr_t pa;
801:
802: pa = (ram_addr_t)vdev->vq[i].pfn << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
803: virtqueue_init(&vdev->vq[i], pa);
804: }
805: }
806:
807: virtio_update_irq(vdev);
808: }
809:
810: VirtIODevice *virtio_init_pci(PCIBus *bus, const char *name,
811: uint16_t vendor, uint16_t device,
812: uint16_t subvendor, uint16_t subdevice,
813: uint16_t class_code, uint8_t pif,
814: size_t config_size, size_t struct_size)
815: {
816: VirtIODevice *vdev;
817: PCIDevice *pci_dev;
818: uint8_t *config;
819: uint32_t size;
820:
821: pci_dev = pci_register_device(bus, name, struct_size,
822: -1, NULL, NULL);
823: if (!pci_dev)
824: return NULL;
825:
826: vdev = to_virtio_device(pci_dev);
827:
828: vdev->status = 0;
829: vdev->isr = 0;
830: vdev->queue_sel = 0;
831: vdev->vq = qemu_mallocz(sizeof(VirtQueue) * VIRTIO_PCI_QUEUE_MAX);
832:
833: config = pci_dev->config;
834: pci_config_set_vendor_id(config, vendor);
835: pci_config_set_device_id(config, device);
836:
837: config[0x08] = VIRTIO_PCI_ABI_VERSION;
838:
839: config[0x09] = pif;
840: pci_config_set_class(config, class_code);
841: config[0x0e] = 0x00;
842:
843: config[0x2c] = subvendor & 0xFF;
844: config[0x2d] = (subvendor >> 8) & 0xFF;
845: config[0x2e] = subdevice & 0xFF;
846: config[0x2f] = (subdevice >> 8) & 0xFF;
847:
848: config[0x3d] = 1;
849:
850: vdev->name = name;
851: vdev->config_len = config_size;
852: if (vdev->config_len)
853: vdev->config = qemu_mallocz(config_size);
854: else
855: vdev->config = NULL;
856:
857: size = 20 + config_size;
858: if (size & (size-1))
859: size = 1 << qemu_fls(size);
860:
861: pci_register_io_region(pci_dev, 0, size, PCI_ADDRESS_SPACE_IO,
862: virtio_map);
863: qemu_register_reset(virtio_reset, vdev);
864:
865: return vdev;
866: }
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