38 static inline int __vringh_get_head(const struct vringh *vrh,  in __vringh_get_head()  argument
39 				    int (*getu16)(const struct vringh *vrh,  in __vringh_get_head()  argument
46 	err = getu16(vrh, &avail_idx, &vrh->vring.avail->idx);  in __vringh_get_head()
49 			   &vrh->vring.avail->idx);  in __vringh_get_head()
54 		return vrh->vring.num;  in __vringh_get_head()
57 	virtio_rmb(vrh->weak_barriers);  in __vringh_get_head()
59 	i = *last_avail_idx & (vrh->vring.num - 1);  in __vringh_get_head()
61 	err = getu16(vrh, &head, &vrh->vring.avail->ring[i]);  in __vringh_get_head()
64 			   *last_avail_idx, &vrh->vring.avail->ring[i]);  in __vringh_get_head()
68 	if (head >= vrh->vring.num) {  in __vringh_get_head()
70 			   head, vrh->vring.num);  in __vringh_get_head()
107 static inline ssize_t vringh_iov_xfer(struct vringh *vrh,  in vringh_iov_xfer()  argument
110 				      int (*xfer)(const struct vringh *vrh,  in vringh_iov_xfer()  argument
120 		err = xfer(vrh, iov->iov[iov->i].iov_base, ptr, partlen);  in vringh_iov_xfer()
133 static inline bool range_check(struct vringh *vrh, u64 addr, size_t *len,  in range_check()  argument
139 		if (!getrange(vrh, addr, range))  in range_check()
167 static inline bool no_range_check(struct vringh *vrh, u64 addr, size_t *len,  in no_range_check()  argument
176 static int move_to_indirect(const struct vringh *vrh,  in move_to_indirect()  argument
189 	len = vringh32_to_cpu(vrh, desc->len);  in move_to_indirect()
196 	if (desc->flags & cpu_to_vringh16(vrh, VRING_DESC_F_NEXT))  in move_to_indirect()
197 		*up_next = vringh16_to_cpu(vrh, desc->next);  in move_to_indirect()
235 static u16 __cold return_from_indirect(const struct vringh *vrh, int *up_next,  in return_from_indirect()  argument
241 	*descs = vrh->vring.desc;  in return_from_indirect()
242 	*desc_max = vrh->vring.num;  in return_from_indirect()
246 static int slow_copy(struct vringh *vrh, void *dst, const void *src,  in slow_copy()  argument
247 		     bool (*rcheck)(struct vringh *vrh, u64 addr, size_t *len,  in slow_copy()  argument
249 				    bool (*getrange)(struct vringh *vrh,  in slow_copy()  argument
252 		     bool (*getrange)(struct vringh *vrh,  in slow_copy()
256 		     int (*copy)(const struct vringh *vrh,  in slow_copy()  argument
268 		if (!rcheck(vrh, addr, &part, range, getrange))  in slow_copy()
271 		err = copy(vrh, dst, src, part);  in slow_copy()
283 __vringh_iov(struct vringh *vrh, u16 i,  in __vringh_iov()  argument
286 	     bool (*rcheck)(struct vringh *vrh, u64 addr, size_t *len,  in __vringh_iov()  argument
292 	     int (*copy)(const struct vringh *vrh,  in __vringh_iov()  argument
301 	descs = vrh->vring.desc;  in __vringh_iov()
302 	desc_max = vrh->vring.num;  in __vringh_iov()
320 			err = slow_copy(vrh, &desc, &descs[i], rcheck, getrange,  in __vringh_iov()
323 			err = copy(vrh, &desc, &descs[i], sizeof(desc));  in __vringh_iov()
328 			     cpu_to_vringh16(vrh, VRING_DESC_F_INDIRECT))) {  in __vringh_iov()
329 			u64 a = vringh64_to_cpu(vrh, desc.addr);  in __vringh_iov()
332 			len = vringh32_to_cpu(vrh, desc.len);  in __vringh_iov()
333 			if (!rcheck(vrh, a, &len, &range, getrange)) {  in __vringh_iov()
338 			if (unlikely(len != vringh32_to_cpu(vrh, desc.len))) {  in __vringh_iov()
345 			err = move_to_indirect(vrh, &up_next, &i, addr, &desc,  in __vringh_iov()
352 		if (count++ == vrh->vring.num) {  in __vringh_iov()
358 		if (desc.flags & cpu_to_vringh16(vrh, VRING_DESC_F_WRITE))  in __vringh_iov()
379 		len = vringh32_to_cpu(vrh, desc.len);  in __vringh_iov()
380 		if (!rcheck(vrh, vringh64_to_cpu(vrh, desc.addr), &len, &range,  in __vringh_iov()
385 		addr = (void *)(unsigned long)(vringh64_to_cpu(vrh, desc.addr) +  in __vringh_iov()
398 		if (unlikely(len != vringh32_to_cpu(vrh, desc.len))) {  in __vringh_iov()
399 			desc.len = cpu_to_vringh32(vrh,  in __vringh_iov()
400 				   vringh32_to_cpu(vrh, desc.len) - len);  in __vringh_iov()
401 			desc.addr = cpu_to_vringh64(vrh,  in __vringh_iov()
402 				    vringh64_to_cpu(vrh, desc.addr) + len);  in __vringh_iov()
406 		if (desc.flags & cpu_to_vringh16(vrh, VRING_DESC_F_NEXT)) {  in __vringh_iov()
407 			i = vringh16_to_cpu(vrh, desc.next);  in __vringh_iov()
411 				i = return_from_indirect(vrh, &up_next,  in __vringh_iov()
431 static inline int __vringh_complete(struct vringh *vrh,  in __vringh_complete()  argument
434 				    int (*putu16)(const struct vringh *vrh,  in __vringh_complete()  argument
436 				    int (*putused)(const struct vringh *vrh,  in __vringh_complete()  argument
445 	used_ring = vrh->vring.used;  in __vringh_complete()
446 	used_idx = vrh->last_used_idx + vrh->completed;  in __vringh_complete()
448 	off = used_idx % vrh->vring.num;  in __vringh_complete()
451 	if (num_used > 1 && unlikely(off + num_used >= vrh->vring.num)) {  in __vringh_complete()
452 		u16 part = vrh->vring.num - off;  in __vringh_complete()
453 		err = putused(vrh, &used_ring->ring[off], used, part);  in __vringh_complete()
455 			err = putused(vrh, &used_ring->ring[0], used + part,  in __vringh_complete()
458 		err = putused(vrh, &used_ring->ring[off], used, num_used);  in __vringh_complete()
467 	virtio_wmb(vrh->weak_barriers);  in __vringh_complete()
469 	err = putu16(vrh, &vrh->vring.used->idx, used_idx + num_used);  in __vringh_complete()
472 			   &vrh->vring.used->idx);  in __vringh_complete()
476 	vrh->completed += num_used;  in __vringh_complete()
481 static inline int __vringh_need_notify(struct vringh *vrh,  in __vringh_need_notify()  argument
482 				       int (*getu16)(const struct vringh *vrh,  in __vringh_need_notify()  argument
493 	virtio_mb(vrh->weak_barriers);  in __vringh_need_notify()
496 	if (!vrh->event_indices) {  in __vringh_need_notify()
498 		err = getu16(vrh, &flags, &vrh->vring.avail->flags);  in __vringh_need_notify()
501 				   &vrh->vring.avail->flags);  in __vringh_need_notify()
508 	err = getu16(vrh, &used_event, &vring_used_event(&vrh->vring));  in __vringh_need_notify()
511 			   &vring_used_event(&vrh->vring));  in __vringh_need_notify()
516 	if (unlikely(vrh->completed > 0xffff))  in __vringh_need_notify()
520 					  vrh->last_used_idx + vrh->completed,  in __vringh_need_notify()
521 					  vrh->last_used_idx);  in __vringh_need_notify()
523 	vrh->last_used_idx += vrh->completed;  in __vringh_need_notify()
524 	vrh->completed = 0;  in __vringh_need_notify()
528 static inline bool __vringh_notify_enable(struct vringh *vrh,  in __vringh_notify_enable()  argument
529 					  int (*getu16)(const struct vringh *vrh,  in __vringh_notify_enable()  argument
531 					  int (*putu16)(const struct vringh *vrh,  in __vringh_notify_enable()  argument
536 	if (!vrh->event_indices) {  in __vringh_notify_enable()
538 		if (putu16(vrh, &vrh->vring.used->flags, 0) != 0) {  in __vringh_notify_enable()
540 				   &vrh->vring.used->flags);  in __vringh_notify_enable()
544 		if (putu16(vrh, &vring_avail_event(&vrh->vring),  in __vringh_notify_enable()
545 			   vrh->last_avail_idx) != 0) {  in __vringh_notify_enable()
547 				   &vring_avail_event(&vrh->vring));  in __vringh_notify_enable()
554 	virtio_mb(vrh->weak_barriers);  in __vringh_notify_enable()
556 	if (getu16(vrh, &avail, &vrh->vring.avail->idx) != 0) {  in __vringh_notify_enable()
558 			   &vrh->vring.avail->idx);  in __vringh_notify_enable()
565 	return avail == vrh->last_avail_idx;  in __vringh_notify_enable()
568 static inline void __vringh_notify_disable(struct vringh *vrh,  in __vringh_notify_disable()  argument
569 					   int (*putu16)(const struct vringh *vrh,  in __vringh_notify_disable()  argument
572 	if (!vrh->event_indices) {  in __vringh_notify_disable()
574 		if (putu16(vrh, &vrh->vring.used->flags,  in __vringh_notify_disable()
577 				   &vrh->vring.used->flags);  in __vringh_notify_disable()
583 static inline int getu16_user(const struct vringh *vrh, u16 *val, const __virtio16 *p)  in getu16_user()  argument
587 	*val = vringh16_to_cpu(vrh, v);  in getu16_user()
591 static inline int putu16_user(const struct vringh *vrh, __virtio16 *p, u16 val)  in putu16_user()  argument
593 	__virtio16 v = cpu_to_vringh16(vrh, val);  in putu16_user()
597 static inline int copydesc_user(const struct vringh *vrh,  in copydesc_user()  argument
604 static inline int putused_user(const struct vringh *vrh,  in putused_user()  argument
613 static inline int xfer_from_user(const struct vringh *vrh, void *src,  in xfer_from_user()  argument
620 static inline int xfer_to_user(const struct vringh *vrh,  in xfer_to_user()  argument
640 int vringh_init_user(struct vringh *vrh, u64 features,  in vringh_init_user()  argument
652 	vrh->little_endian = (features & (1ULL << VIRTIO_F_VERSION_1));  in vringh_init_user()
653 	vrh->event_indices = (features & (1 << VIRTIO_RING_F_EVENT_IDX));  in vringh_init_user()
654 	vrh->weak_barriers = weak_barriers;  in vringh_init_user()
655 	vrh->completed = 0;  in vringh_init_user()
656 	vrh->last_avail_idx = 0;  in vringh_init_user()
657 	vrh->last_used_idx = 0;  in vringh_init_user()
658 	vrh->vring.num = num;  in vringh_init_user()
660 	vrh->vring.desc = (__force struct vring_desc *)desc;  in vringh_init_user()
661 	vrh->vring.avail = (__force struct vring_avail *)avail;  in vringh_init_user()
662 	vrh->vring.used = (__force struct vring_used *)used;  in vringh_init_user()
687 int vringh_getdesc_user(struct vringh *vrh,  in vringh_getdesc_user()  argument
690 			bool (*getrange)(struct vringh *vrh,  in vringh_getdesc_user()  argument
696 	*head = vrh->vring.num;  in vringh_getdesc_user()
697 	err = __vringh_get_head(vrh, getu16_user, &vrh->last_avail_idx);  in vringh_getdesc_user()
702 	if (err == vrh->vring.num)  in vringh_getdesc_user()
726 	err = __vringh_iov(vrh, *head, (struct vringh_kiov *)riov,  in vringh_getdesc_user()
775 void vringh_abandon_user(struct vringh *vrh, unsigned int num)  in vringh_abandon_user()  argument
779 	vrh->last_avail_idx -= num;  in vringh_abandon_user()
792 int vringh_complete_user(struct vringh *vrh, u16 head, u32 len)  in vringh_complete_user()  argument
796 	used.id = cpu_to_vringh32(vrh, head);  in vringh_complete_user()
797 	used.len = cpu_to_vringh32(vrh, len);  in vringh_complete_user()
798 	return __vringh_complete(vrh, &used, 1, putu16_user, putused_user);  in vringh_complete_user()
811 int vringh_complete_multi_user(struct vringh *vrh,  in vringh_complete_multi_user()  argument
815 	return __vringh_complete(vrh, used, num_used,  in vringh_complete_multi_user()
827 bool vringh_notify_enable_user(struct vringh *vrh)  in vringh_notify_enable_user()  argument
829 	return __vringh_notify_enable(vrh, getu16_user, putu16_user);  in vringh_notify_enable_user()
840 void vringh_notify_disable_user(struct vringh *vrh)  in vringh_notify_disable_user()  argument
842 	__vringh_notify_disable(vrh, putu16_user);  in vringh_notify_disable_user()
852 int vringh_need_notify_user(struct vringh *vrh)  in vringh_need_notify_user()  argument
854 	return __vringh_need_notify(vrh, getu16_user);  in vringh_need_notify_user()
859 static inline int getu16_kern(const struct vringh *vrh,  in getu16_kern()  argument
862 	*val = vringh16_to_cpu(vrh, READ_ONCE(*p));  in getu16_kern()
866 static inline int putu16_kern(const struct vringh *vrh, __virtio16 *p, u16 val)  in putu16_kern()  argument
868 	WRITE_ONCE(*p, cpu_to_vringh16(vrh, val));  in putu16_kern()
872 static inline int copydesc_kern(const struct vringh *vrh,  in copydesc_kern()  argument
879 static inline int putused_kern(const struct vringh *vrh,  in putused_kern()  argument
888 static inline int xfer_kern(const struct vringh *vrh, void *src,  in xfer_kern()  argument
895 static inline int kern_xfer(const struct vringh *vrh, void *dst,  in kern_xfer()  argument
914 int vringh_init_kern(struct vringh *vrh, u64 features,  in vringh_init_kern()  argument
926 	vrh->little_endian = (features & (1ULL << VIRTIO_F_VERSION_1));  in vringh_init_kern()
927 	vrh->event_indices = (features & (1 << VIRTIO_RING_F_EVENT_IDX));  in vringh_init_kern()
928 	vrh->weak_barriers = weak_barriers;  in vringh_init_kern()
929 	vrh->completed = 0;  in vringh_init_kern()
930 	vrh->last_avail_idx = 0;  in vringh_init_kern()
931 	vrh->last_used_idx = 0;  in vringh_init_kern()
932 	vrh->vring.num = num;  in vringh_init_kern()
933 	vrh->vring.desc = desc;  in vringh_init_kern()
934 	vrh->vring.avail = avail;  in vringh_init_kern()
935 	vrh->vring.used = used;  in vringh_init_kern()
960 int vringh_getdesc_kern(struct vringh *vrh,  in vringh_getdesc_kern()  argument
968 	err = __vringh_get_head(vrh, getu16_kern, &vrh->last_avail_idx);  in vringh_getdesc_kern()
973 	if (err == vrh->vring.num)  in vringh_getdesc_kern()
977 	err = __vringh_iov(vrh, *head, riov, wiov, no_range_check, NULL,  in vringh_getdesc_kern()
1023 void vringh_abandon_kern(struct vringh *vrh, unsigned int num)  in vringh_abandon_kern()  argument
1027 	vrh->last_avail_idx -= num;  in vringh_abandon_kern()
1040 int vringh_complete_kern(struct vringh *vrh, u16 head, u32 len)  in vringh_complete_kern()  argument
1044 	used.id = cpu_to_vringh32(vrh, head);  in vringh_complete_kern()
1045 	used.len = cpu_to_vringh32(vrh, len);  in vringh_complete_kern()
1047 	return __vringh_complete(vrh, &used, 1, putu16_kern, putused_kern);  in vringh_complete_kern()
1058 bool vringh_notify_enable_kern(struct vringh *vrh)  in vringh_notify_enable_kern()  argument
1060 	return __vringh_notify_enable(vrh, getu16_kern, putu16_kern);  in vringh_notify_enable_kern()
1071 void vringh_notify_disable_kern(struct vringh *vrh)  in vringh_notify_disable_kern()  argument
1073 	__vringh_notify_disable(vrh, putu16_kern);  in vringh_notify_disable_kern()
1083 int vringh_need_notify_kern(struct vringh *vrh)  in vringh_need_notify_kern()  argument
1085 	return __vringh_need_notify(vrh, getu16_kern);  in vringh_need_notify_kern()
1091 static int iotlb_translate(const struct vringh *vrh,  in iotlb_translate()  argument
1096 	struct vhost_iotlb *iotlb = vrh->iotlb;  in iotlb_translate()
1100 	spin_lock(vrh->iotlb_lock);  in iotlb_translate()
1131 	spin_unlock(vrh->iotlb_lock);  in iotlb_translate()
1136 static inline int copy_from_iotlb(const struct vringh *vrh, void *dst,  in copy_from_iotlb()  argument
1143 	ret = iotlb_translate(vrh, (u64)(uintptr_t)src,  in copy_from_iotlb()
1155 static inline int copy_to_iotlb(const struct vringh *vrh, void *dst,  in copy_to_iotlb()  argument
1162 	ret = iotlb_translate(vrh, (u64)(uintptr_t)dst,  in copy_to_iotlb()
1172 static inline int getu16_iotlb(const struct vringh *vrh,  in getu16_iotlb()  argument
1180 	ret = iotlb_translate(vrh, (u64)(uintptr_t)p, sizeof(*p),  in getu16_iotlb()
1187 	*val = vringh16_to_cpu(vrh, READ_ONCE(*(__virtio16 *)from));  in getu16_iotlb()
1193 static inline int putu16_iotlb(const struct vringh *vrh,  in putu16_iotlb()  argument
1201 	ret = iotlb_translate(vrh, (u64)(uintptr_t)p, sizeof(*p),  in putu16_iotlb()
1208 	WRITE_ONCE(*(__virtio16 *)to, cpu_to_vringh16(vrh, val));  in putu16_iotlb()
1214 static inline int copydesc_iotlb(const struct vringh *vrh,  in copydesc_iotlb()  argument
1219 	ret = copy_from_iotlb(vrh, dst, (void *)src, len);  in copydesc_iotlb()
1226 static inline int xfer_from_iotlb(const struct vringh *vrh, void *src,  in xfer_from_iotlb()  argument
1231 	ret = copy_from_iotlb(vrh, dst, src, len);  in xfer_from_iotlb()
1238 static inline int xfer_to_iotlb(const struct vringh *vrh,  in xfer_to_iotlb()  argument
1243 	ret = copy_to_iotlb(vrh, dst, src, len);  in xfer_to_iotlb()
1250 static inline int putused_iotlb(const struct vringh *vrh,  in putused_iotlb()  argument
1258 	ret = copy_to_iotlb(vrh, dst, (void *)src, num * sizeof(*dst));  in putused_iotlb()
1277 int vringh_init_iotlb(struct vringh *vrh, u64 features,  in vringh_init_iotlb()  argument
1283 	return vringh_init_kern(vrh, features, num, weak_barriers,  in vringh_init_iotlb()
1294 void vringh_set_iotlb(struct vringh *vrh, struct vhost_iotlb *iotlb,  in vringh_set_iotlb()  argument
1297 	vrh->iotlb = iotlb;  in vringh_set_iotlb()
1298 	vrh->iotlb_lock = iotlb_lock;  in vringh_set_iotlb()
1323 int vringh_getdesc_iotlb(struct vringh *vrh,  in vringh_getdesc_iotlb()  argument
1331 	err = __vringh_get_head(vrh, getu16_iotlb, &vrh->last_avail_idx);  in vringh_getdesc_iotlb()
1336 	if (err == vrh->vring.num)  in vringh_getdesc_iotlb()
1340 	err = __vringh_iov(vrh, *head, riov, wiov, no_range_check, NULL,  in vringh_getdesc_iotlb()
1358 ssize_t vringh_iov_pull_iotlb(struct vringh *vrh,  in vringh_iov_pull_iotlb()  argument
1362 	return vringh_iov_xfer(vrh, riov, dst, len, xfer_from_iotlb);  in vringh_iov_pull_iotlb()
1375 ssize_t vringh_iov_push_iotlb(struct vringh *vrh,  in vringh_iov_push_iotlb()  argument
1379 	return vringh_iov_xfer(vrh, wiov, (void *)src, len, xfer_to_iotlb);  in vringh_iov_push_iotlb()
1391 void vringh_abandon_iotlb(struct vringh *vrh, unsigned int num)  in vringh_abandon_iotlb()  argument
1396 	vrh->last_avail_idx -= num;  in vringh_abandon_iotlb()
1409 int vringh_complete_iotlb(struct vringh *vrh, u16 head, u32 len)  in vringh_complete_iotlb()  argument
1413 	used.id = cpu_to_vringh32(vrh, head);  in vringh_complete_iotlb()
1414 	used.len = cpu_to_vringh32(vrh, len);  in vringh_complete_iotlb()
1416 	return __vringh_complete(vrh, &used, 1, putu16_iotlb, putused_iotlb);  in vringh_complete_iotlb()
1427 bool vringh_notify_enable_iotlb(struct vringh *vrh)  in vringh_notify_enable_iotlb()  argument
1429 	return __vringh_notify_enable(vrh, getu16_iotlb, putu16_iotlb);  in vringh_notify_enable_iotlb()
1440 void vringh_notify_disable_iotlb(struct vringh *vrh)  in vringh_notify_disable_iotlb()  argument
1442 	__vringh_notify_disable(vrh, putu16_iotlb);  in vringh_notify_disable_iotlb()
1452 int vringh_need_notify_iotlb(struct vringh *vrh)  in vringh_need_notify_iotlb()  argument
1454 	return __vringh_need_notify(vrh, getu16_iotlb);  in vringh_need_notify_iotlb()