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/*
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* Virtio Support
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*
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* Copyright IBM, Corp. 2007
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include <inttypes.h> |
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#include "trace.h" |
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#include "qemu-error.h" |
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#include "virtio.h" |
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#include "sysemu.h" |
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/* The alignment to use between consumer and producer parts of vring.
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* x86 pagesize again. */
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#define VIRTIO_PCI_VRING_ALIGN 4096 |
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/* QEMU doesn't strictly need write barriers since everything runs in
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* lock-step. We'll leave the calls to wmb() in though to make it obvious for
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* KVM or if kqemu gets SMP support.
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* In any case, we must prevent the compiler from reordering the code.
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* TODO: we likely need some rmb()/mb() as well.
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*/
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#define wmb() __asm__ __volatile__("": : :"memory") |
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typedef struct VRingDesc |
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{ |
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uint64_t addr; |
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uint32_t len; |
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uint16_t flags; |
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uint16_t next; |
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} VRingDesc; |
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typedef struct VRingAvail |
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{ |
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uint16_t flags; |
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uint16_t idx; |
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uint16_t ring[0];
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} VRingAvail; |
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typedef struct VRingUsedElem |
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{ |
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uint32_t id; |
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uint32_t len; |
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} VRingUsedElem; |
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typedef struct VRingUsed |
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{ |
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uint16_t flags; |
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uint16_t idx; |
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VRingUsedElem ring[0];
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} VRingUsed; |
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typedef struct VRing |
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{ |
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unsigned int num; |
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target_phys_addr_t desc; |
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target_phys_addr_t avail; |
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target_phys_addr_t used; |
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} VRing; |
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struct VirtQueue
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{ |
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VRing vring; |
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target_phys_addr_t pa; |
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uint16_t last_avail_idx; |
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int inuse;
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uint16_t vector; |
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void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
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VirtIODevice *vdev; |
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EventNotifier guest_notifier; |
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EventNotifier host_notifier; |
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}; |
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/* virt queue functions */
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static void virtqueue_init(VirtQueue *vq) |
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{ |
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target_phys_addr_t pa = vq->pa; |
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vq->vring.desc = pa; |
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vq->vring.avail = pa + vq->vring.num * sizeof(VRingDesc);
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vq->vring.used = vring_align(vq->vring.avail + |
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offsetof(VRingAvail, ring[vq->vring.num]), |
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VIRTIO_PCI_VRING_ALIGN); |
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} |
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static inline uint64_t vring_desc_addr(target_phys_addr_t desc_pa, int i) |
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{ |
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target_phys_addr_t pa; |
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pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, addr);
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return ldq_phys(pa);
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} |
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static inline uint32_t vring_desc_len(target_phys_addr_t desc_pa, int i) |
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{ |
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target_phys_addr_t pa; |
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pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, len);
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return ldl_phys(pa);
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} |
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static inline uint16_t vring_desc_flags(target_phys_addr_t desc_pa, int i) |
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{ |
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target_phys_addr_t pa; |
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pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, flags);
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return lduw_phys(pa);
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} |
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static inline uint16_t vring_desc_next(target_phys_addr_t desc_pa, int i) |
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{ |
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target_phys_addr_t pa; |
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pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, next);
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return lduw_phys(pa);
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} |
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static inline uint16_t vring_avail_flags(VirtQueue *vq) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.avail + offsetof(VRingAvail, flags); |
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return lduw_phys(pa);
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} |
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static inline uint16_t vring_avail_idx(VirtQueue *vq) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.avail + offsetof(VRingAvail, idx); |
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return lduw_phys(pa);
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} |
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static inline uint16_t vring_avail_ring(VirtQueue *vq, int i) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.avail + offsetof(VRingAvail, ring[i]); |
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return lduw_phys(pa);
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} |
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static inline void vring_used_ring_id(VirtQueue *vq, int i, uint32_t val) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.used + offsetof(VRingUsed, ring[i].id); |
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stl_phys(pa, val); |
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} |
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static inline void vring_used_ring_len(VirtQueue *vq, int i, uint32_t val) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.used + offsetof(VRingUsed, ring[i].len); |
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stl_phys(pa, val); |
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} |
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static uint16_t vring_used_idx(VirtQueue *vq)
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.used + offsetof(VRingUsed, idx); |
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return lduw_phys(pa);
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} |
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static inline void vring_used_idx_increment(VirtQueue *vq, uint16_t val) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.used + offsetof(VRingUsed, idx); |
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stw_phys(pa, vring_used_idx(vq) + val); |
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} |
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static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.used + offsetof(VRingUsed, flags); |
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stw_phys(pa, lduw_phys(pa) | mask); |
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} |
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static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.used + offsetof(VRingUsed, flags); |
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stw_phys(pa, lduw_phys(pa) & ~mask); |
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} |
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void virtio_queue_set_notification(VirtQueue *vq, int enable) |
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{ |
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if (enable)
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vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); |
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else
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vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY); |
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} |
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int virtio_queue_ready(VirtQueue *vq)
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{ |
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return vq->vring.avail != 0; |
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} |
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int virtio_queue_empty(VirtQueue *vq)
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{ |
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return vring_avail_idx(vq) == vq->last_avail_idx;
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} |
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void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, |
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unsigned int len, unsigned int idx) |
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{ |
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unsigned int offset; |
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int i;
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trace_virtqueue_fill(vq, elem, len, idx); |
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offset = 0;
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for (i = 0; i < elem->in_num; i++) { |
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size_t size = MIN(len - offset, elem->in_sg[i].iov_len); |
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cpu_physical_memory_unmap(elem->in_sg[i].iov_base, |
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elem->in_sg[i].iov_len, |
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1, size);
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offset += elem->in_sg[i].iov_len; |
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} |
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for (i = 0; i < elem->out_num; i++) |
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cpu_physical_memory_unmap(elem->out_sg[i].iov_base, |
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elem->out_sg[i].iov_len, |
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0, elem->out_sg[i].iov_len);
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idx = (idx + vring_used_idx(vq)) % vq->vring.num; |
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/* Get a pointer to the next entry in the used ring. */
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vring_used_ring_id(vq, idx, elem->index); |
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vring_used_ring_len(vq, idx, len); |
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} |
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void virtqueue_flush(VirtQueue *vq, unsigned int count) |
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{ |
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/* Make sure buffer is written before we update index. */
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wmb(); |
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trace_virtqueue_flush(vq, count); |
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vring_used_idx_increment(vq, count); |
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vq->inuse -= count; |
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} |
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void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, |
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unsigned int len) |
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{ |
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virtqueue_fill(vq, elem, len, 0);
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virtqueue_flush(vq, 1);
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} |
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static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx) |
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{ |
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uint16_t num_heads = vring_avail_idx(vq) - idx; |
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/* Check it isn't doing very strange things with descriptor numbers. */
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if (num_heads > vq->vring.num) {
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error_report("Guest moved used index from %u to %u",
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idx, vring_avail_idx(vq)); |
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exit(1);
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} |
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return num_heads;
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} |
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static unsigned int virtqueue_get_head(VirtQueue *vq, unsigned int idx) |
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{ |
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unsigned int head; |
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/* Grab the next descriptor number they're advertising, and increment
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* the index we've seen. */
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head = vring_avail_ring(vq, idx % vq->vring.num); |
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/* If their number is silly, that's a fatal mistake. */
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if (head >= vq->vring.num) {
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error_report("Guest says index %u is available", head);
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exit(1);
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} |
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return head;
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} |
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static unsigned virtqueue_next_desc(target_phys_addr_t desc_pa, |
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unsigned int i, unsigned int max) |
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{ |
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unsigned int next; |
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/* If this descriptor says it doesn't chain, we're done. */
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if (!(vring_desc_flags(desc_pa, i) & VRING_DESC_F_NEXT))
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return max;
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/* Check they're not leading us off end of descriptors. */
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next = vring_desc_next(desc_pa, i); |
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/* Make sure compiler knows to grab that: we don't want it changing! */
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wmb(); |
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if (next >= max) {
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error_report("Desc next is %u", next);
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exit(1);
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} |
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return next;
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} |
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int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes) |
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{ |
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unsigned int idx; |
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int total_bufs, in_total, out_total;
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idx = vq->last_avail_idx; |
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total_bufs = in_total = out_total = 0;
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while (virtqueue_num_heads(vq, idx)) {
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unsigned int max, num_bufs, indirect = 0; |
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target_phys_addr_t desc_pa; |
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int i;
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max = vq->vring.num; |
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num_bufs = total_bufs; |
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i = virtqueue_get_head(vq, idx++); |
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desc_pa = vq->vring.desc; |
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if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_INDIRECT) {
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if (vring_desc_len(desc_pa, i) % sizeof(VRingDesc)) { |
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error_report("Invalid size for indirect buffer table");
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exit(1);
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} |
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/* If we've got too many, that implies a descriptor loop. */
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if (num_bufs >= max) {
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error_report("Looped descriptor");
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exit(1);
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} |
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/* loop over the indirect descriptor table */
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indirect = 1;
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max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc);
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num_bufs = i = 0;
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desc_pa = vring_desc_addr(desc_pa, i); |
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} |
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do {
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/* If we've got too many, that implies a descriptor loop. */
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if (++num_bufs > max) {
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error_report("Looped descriptor");
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exit(1);
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} |
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if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_WRITE) {
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if (in_bytes > 0 && |
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(in_total += vring_desc_len(desc_pa, i)) >= in_bytes) |
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return 1; |
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} else {
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if (out_bytes > 0 && |
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(out_total += vring_desc_len(desc_pa, i)) >= out_bytes) |
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return 1; |
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} |
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} while ((i = virtqueue_next_desc(desc_pa, i, max)) != max);
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if (!indirect)
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total_bufs = num_bufs; |
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else
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total_bufs++; |
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} |
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return 0; |
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} |
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void virtqueue_map_sg(struct iovec *sg, target_phys_addr_t *addr, |
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size_t num_sg, int is_write)
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{ |
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unsigned int i; |
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target_phys_addr_t len; |
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for (i = 0; i < num_sg; i++) { |
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len = sg[i].iov_len; |
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sg[i].iov_base = cpu_physical_memory_map(addr[i], &len, is_write); |
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if (sg[i].iov_base == NULL || len != sg[i].iov_len) { |
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error_report("virtio: trying to map MMIO memory");
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exit(1);
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} |
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} |
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} |
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int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem)
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{ |
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unsigned int i, head, max; |
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target_phys_addr_t desc_pa = vq->vring.desc; |
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if (!virtqueue_num_heads(vq, vq->last_avail_idx))
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return 0; |
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/* When we start there are none of either input nor output. */
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elem->out_num = elem->in_num = 0;
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max = vq->vring.num; |
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i = head = virtqueue_get_head(vq, vq->last_avail_idx++); |
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if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_INDIRECT) {
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if (vring_desc_len(desc_pa, i) % sizeof(VRingDesc)) { |
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error_report("Invalid size for indirect buffer table");
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exit(1);
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} |
404 |
|
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/* loop over the indirect descriptor table */
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max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc);
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desc_pa = vring_desc_addr(desc_pa, i); |
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i = 0;
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} |
410 |
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/* Collect all the descriptors */
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do {
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struct iovec *sg;
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if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_WRITE) {
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elem->in_addr[elem->in_num] = vring_desc_addr(desc_pa, i); |
417 |
sg = &elem->in_sg[elem->in_num++]; |
418 |
} else {
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elem->out_addr[elem->out_num] = vring_desc_addr(desc_pa, i); |
420 |
sg = &elem->out_sg[elem->out_num++]; |
421 |
} |
422 |
|
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sg->iov_len = vring_desc_len(desc_pa, i); |
424 |
|
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/* If we've got too many, that implies a descriptor loop. */
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if ((elem->in_num + elem->out_num) > max) {
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error_report("Looped descriptor");
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exit(1);
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} |
430 |
} while ((i = virtqueue_next_desc(desc_pa, i, max)) != max);
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431 |
|
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/* Now map what we have collected */
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virtqueue_map_sg(elem->in_sg, elem->in_addr, elem->in_num, 1);
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virtqueue_map_sg(elem->out_sg, elem->out_addr, elem->out_num, 0);
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435 |
|
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elem->index = head; |
437 |
|
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vq->inuse++; |
439 |
|
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trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num); |
441 |
return elem->in_num + elem->out_num;
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} |
443 |
|
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/* virtio device */
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445 |
static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector) |
446 |
{ |
447 |
if (vdev->binding->notify) {
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448 |
vdev->binding->notify(vdev->binding_opaque, vector); |
449 |
} |
450 |
} |
451 |
|
452 |
void virtio_update_irq(VirtIODevice *vdev)
|
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{ |
454 |
virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
455 |
} |
456 |
|
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void virtio_reset(void *opaque) |
458 |
{ |
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VirtIODevice *vdev = opaque; |
460 |
int i;
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461 |
|
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virtio_set_status(vdev, 0);
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463 |
|
464 |
if (vdev->reset)
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vdev->reset(vdev); |
466 |
|
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vdev->guest_features = 0;
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468 |
vdev->queue_sel = 0;
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vdev->status = 0;
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vdev->isr = 0;
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vdev->config_vector = VIRTIO_NO_VECTOR; |
472 |
virtio_notify_vector(vdev, vdev->config_vector); |
473 |
|
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for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
475 |
vdev->vq[i].vring.desc = 0;
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vdev->vq[i].vring.avail = 0;
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vdev->vq[i].vring.used = 0;
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vdev->vq[i].last_avail_idx = 0;
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vdev->vq[i].pa = 0;
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vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
481 |
} |
482 |
} |
483 |
|
484 |
uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr) |
485 |
{ |
486 |
uint8_t val; |
487 |
|
488 |
vdev->get_config(vdev, vdev->config); |
489 |
|
490 |
if (addr > (vdev->config_len - sizeof(val))) |
491 |
return (uint32_t)-1; |
492 |
|
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memcpy(&val, vdev->config + addr, sizeof(val));
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return val;
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495 |
} |
496 |
|
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uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr) |
498 |
{ |
499 |
uint16_t val; |
500 |
|
501 |
vdev->get_config(vdev, vdev->config); |
502 |
|
503 |
if (addr > (vdev->config_len - sizeof(val))) |
504 |
return (uint32_t)-1; |
505 |
|
506 |
memcpy(&val, vdev->config + addr, sizeof(val));
|
507 |
return val;
|
508 |
} |
509 |
|
510 |
uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr) |
511 |
{ |
512 |
uint32_t val; |
513 |
|
514 |
vdev->get_config(vdev, vdev->config); |
515 |
|
516 |
if (addr > (vdev->config_len - sizeof(val))) |
517 |
return (uint32_t)-1; |
518 |
|
519 |
memcpy(&val, vdev->config + addr, sizeof(val));
|
520 |
return val;
|
521 |
} |
522 |
|
523 |
void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
524 |
{ |
525 |
uint8_t val = data; |
526 |
|
527 |
if (addr > (vdev->config_len - sizeof(val))) |
528 |
return;
|
529 |
|
530 |
memcpy(vdev->config + addr, &val, sizeof(val));
|
531 |
|
532 |
if (vdev->set_config)
|
533 |
vdev->set_config(vdev, vdev->config); |
534 |
} |
535 |
|
536 |
void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
537 |
{ |
538 |
uint16_t val = data; |
539 |
|
540 |
if (addr > (vdev->config_len - sizeof(val))) |
541 |
return;
|
542 |
|
543 |
memcpy(vdev->config + addr, &val, sizeof(val));
|
544 |
|
545 |
if (vdev->set_config)
|
546 |
vdev->set_config(vdev, vdev->config); |
547 |
} |
548 |
|
549 |
void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
550 |
{ |
551 |
uint32_t val = data; |
552 |
|
553 |
if (addr > (vdev->config_len - sizeof(val))) |
554 |
return;
|
555 |
|
556 |
memcpy(vdev->config + addr, &val, sizeof(val));
|
557 |
|
558 |
if (vdev->set_config)
|
559 |
vdev->set_config(vdev, vdev->config); |
560 |
} |
561 |
|
562 |
void virtio_queue_set_addr(VirtIODevice *vdev, int n, target_phys_addr_t addr) |
563 |
{ |
564 |
vdev->vq[n].pa = addr; |
565 |
virtqueue_init(&vdev->vq[n]); |
566 |
} |
567 |
|
568 |
target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n)
|
569 |
{ |
570 |
return vdev->vq[n].pa;
|
571 |
} |
572 |
|
573 |
int virtio_queue_get_num(VirtIODevice *vdev, int n) |
574 |
{ |
575 |
return vdev->vq[n].vring.num;
|
576 |
} |
577 |
|
578 |
void virtio_queue_notify(VirtIODevice *vdev, int n) |
579 |
{ |
580 |
if (n < VIRTIO_PCI_QUEUE_MAX && vdev->vq[n].vring.desc) {
|
581 |
trace_virtio_queue_notify(vdev, n, &vdev->vq[n]); |
582 |
vdev->vq[n].handle_output(vdev, &vdev->vq[n]); |
583 |
} |
584 |
} |
585 |
|
586 |
uint16_t virtio_queue_vector(VirtIODevice *vdev, int n)
|
587 |
{ |
588 |
return n < VIRTIO_PCI_QUEUE_MAX ? vdev->vq[n].vector :
|
589 |
VIRTIO_NO_VECTOR; |
590 |
} |
591 |
|
592 |
void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector) |
593 |
{ |
594 |
if (n < VIRTIO_PCI_QUEUE_MAX)
|
595 |
vdev->vq[n].vector = vector; |
596 |
} |
597 |
|
598 |
VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
|
599 |
void (*handle_output)(VirtIODevice *, VirtQueue *))
|
600 |
{ |
601 |
int i;
|
602 |
|
603 |
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
604 |
if (vdev->vq[i].vring.num == 0) |
605 |
break;
|
606 |
} |
607 |
|
608 |
if (i == VIRTIO_PCI_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE)
|
609 |
abort(); |
610 |
|
611 |
vdev->vq[i].vring.num = queue_size; |
612 |
vdev->vq[i].handle_output = handle_output; |
613 |
|
614 |
return &vdev->vq[i];
|
615 |
} |
616 |
|
617 |
void virtio_irq(VirtQueue *vq)
|
618 |
{ |
619 |
trace_virtio_irq(vq); |
620 |
vq->vdev->isr |= 0x01;
|
621 |
virtio_notify_vector(vq->vdev, vq->vector); |
622 |
} |
623 |
|
624 |
void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
|
625 |
{ |
626 |
/* Always notify when queue is empty (when feature acknowledge) */
|
627 |
if ((vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT) &&
|
628 |
(!(vdev->guest_features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) ||
|
629 |
(vq->inuse || vring_avail_idx(vq) != vq->last_avail_idx))) |
630 |
return;
|
631 |
|
632 |
trace_virtio_notify(vdev, vq); |
633 |
vdev->isr |= 0x01;
|
634 |
virtio_notify_vector(vdev, vq->vector); |
635 |
} |
636 |
|
637 |
void virtio_notify_config(VirtIODevice *vdev)
|
638 |
{ |
639 |
if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
|
640 |
return;
|
641 |
|
642 |
vdev->isr |= 0x03;
|
643 |
virtio_notify_vector(vdev, vdev->config_vector); |
644 |
} |
645 |
|
646 |
void virtio_save(VirtIODevice *vdev, QEMUFile *f)
|
647 |
{ |
648 |
int i;
|
649 |
|
650 |
if (vdev->binding->save_config)
|
651 |
vdev->binding->save_config(vdev->binding_opaque, f); |
652 |
|
653 |
qemu_put_8s(f, &vdev->status); |
654 |
qemu_put_8s(f, &vdev->isr); |
655 |
qemu_put_be16s(f, &vdev->queue_sel); |
656 |
qemu_put_be32s(f, &vdev->guest_features); |
657 |
qemu_put_be32(f, vdev->config_len); |
658 |
qemu_put_buffer(f, vdev->config, vdev->config_len); |
659 |
|
660 |
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
661 |
if (vdev->vq[i].vring.num == 0) |
662 |
break;
|
663 |
} |
664 |
|
665 |
qemu_put_be32(f, i); |
666 |
|
667 |
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
668 |
if (vdev->vq[i].vring.num == 0) |
669 |
break;
|
670 |
|
671 |
qemu_put_be32(f, vdev->vq[i].vring.num); |
672 |
qemu_put_be64(f, vdev->vq[i].pa); |
673 |
qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); |
674 |
if (vdev->binding->save_queue)
|
675 |
vdev->binding->save_queue(vdev->binding_opaque, i, f); |
676 |
} |
677 |
} |
678 |
|
679 |
int virtio_load(VirtIODevice *vdev, QEMUFile *f)
|
680 |
{ |
681 |
int num, i, ret;
|
682 |
uint32_t features; |
683 |
uint32_t supported_features = |
684 |
vdev->binding->get_features(vdev->binding_opaque); |
685 |
uint16_t num_heads; |
686 |
|
687 |
if (vdev->binding->load_config) {
|
688 |
ret = vdev->binding->load_config(vdev->binding_opaque, f); |
689 |
if (ret)
|
690 |
return ret;
|
691 |
} |
692 |
|
693 |
qemu_get_8s(f, &vdev->status); |
694 |
qemu_get_8s(f, &vdev->isr); |
695 |
qemu_get_be16s(f, &vdev->queue_sel); |
696 |
qemu_get_be32s(f, &features); |
697 |
if (features & ~supported_features) {
|
698 |
error_report("Features 0x%x unsupported. Allowed features: 0x%x",
|
699 |
features, supported_features); |
700 |
return -1; |
701 |
} |
702 |
if (vdev->set_features)
|
703 |
vdev->set_features(vdev, features); |
704 |
vdev->guest_features = features; |
705 |
vdev->config_len = qemu_get_be32(f); |
706 |
qemu_get_buffer(f, vdev->config, vdev->config_len); |
707 |
|
708 |
num = qemu_get_be32(f); |
709 |
|
710 |
for (i = 0; i < num; i++) { |
711 |
vdev->vq[i].vring.num = qemu_get_be32(f); |
712 |
vdev->vq[i].pa = qemu_get_be64(f); |
713 |
qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); |
714 |
|
715 |
if (vdev->vq[i].pa) {
|
716 |
virtqueue_init(&vdev->vq[i]); |
717 |
} |
718 |
num_heads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx; |
719 |
/* Check it isn't doing very strange things with descriptor numbers. */
|
720 |
if (num_heads > vdev->vq[i].vring.num) {
|
721 |
error_report("VQ %d size 0x%x Guest index 0x%x "
|
722 |
"inconsistent with Host index 0x%x: delta 0x%x",
|
723 |
i, vdev->vq[i].vring.num, |
724 |
vring_avail_idx(&vdev->vq[i]), |
725 |
vdev->vq[i].last_avail_idx, num_heads); |
726 |
return -1; |
727 |
} |
728 |
if (vdev->binding->load_queue) {
|
729 |
ret = vdev->binding->load_queue(vdev->binding_opaque, i, f); |
730 |
if (ret)
|
731 |
return ret;
|
732 |
} |
733 |
} |
734 |
|
735 |
virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
736 |
return 0; |
737 |
} |
738 |
|
739 |
void virtio_cleanup(VirtIODevice *vdev)
|
740 |
{ |
741 |
if (vdev->config)
|
742 |
qemu_free(vdev->config); |
743 |
qemu_free(vdev->vq); |
744 |
} |
745 |
|
746 |
VirtIODevice *virtio_common_init(const char *name, uint16_t device_id, |
747 |
size_t config_size, size_t struct_size) |
748 |
{ |
749 |
VirtIODevice *vdev; |
750 |
int i;
|
751 |
|
752 |
vdev = qemu_mallocz(struct_size); |
753 |
|
754 |
vdev->device_id = device_id; |
755 |
vdev->status = 0;
|
756 |
vdev->isr = 0;
|
757 |
vdev->queue_sel = 0;
|
758 |
vdev->config_vector = VIRTIO_NO_VECTOR; |
759 |
vdev->vq = qemu_mallocz(sizeof(VirtQueue) * VIRTIO_PCI_QUEUE_MAX);
|
760 |
for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
761 |
vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
762 |
vdev->vq[i].vdev = vdev; |
763 |
} |
764 |
|
765 |
vdev->name = name; |
766 |
vdev->config_len = config_size; |
767 |
if (vdev->config_len)
|
768 |
vdev->config = qemu_mallocz(config_size); |
769 |
else
|
770 |
vdev->config = NULL;
|
771 |
|
772 |
return vdev;
|
773 |
} |
774 |
|
775 |
void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding, |
776 |
void *opaque)
|
777 |
{ |
778 |
vdev->binding = binding; |
779 |
vdev->binding_opaque = opaque; |
780 |
} |
781 |
|
782 |
target_phys_addr_t virtio_queue_get_desc_addr(VirtIODevice *vdev, int n)
|
783 |
{ |
784 |
return vdev->vq[n].vring.desc;
|
785 |
} |
786 |
|
787 |
target_phys_addr_t virtio_queue_get_avail_addr(VirtIODevice *vdev, int n)
|
788 |
{ |
789 |
return vdev->vq[n].vring.avail;
|
790 |
} |
791 |
|
792 |
target_phys_addr_t virtio_queue_get_used_addr(VirtIODevice *vdev, int n)
|
793 |
{ |
794 |
return vdev->vq[n].vring.used;
|
795 |
} |
796 |
|
797 |
target_phys_addr_t virtio_queue_get_ring_addr(VirtIODevice *vdev, int n)
|
798 |
{ |
799 |
return vdev->vq[n].vring.desc;
|
800 |
} |
801 |
|
802 |
target_phys_addr_t virtio_queue_get_desc_size(VirtIODevice *vdev, int n)
|
803 |
{ |
804 |
return sizeof(VRingDesc) * vdev->vq[n].vring.num; |
805 |
} |
806 |
|
807 |
target_phys_addr_t virtio_queue_get_avail_size(VirtIODevice *vdev, int n)
|
808 |
{ |
809 |
return offsetof(VRingAvail, ring) +
|
810 |
sizeof(uint64_t) * vdev->vq[n].vring.num;
|
811 |
} |
812 |
|
813 |
target_phys_addr_t virtio_queue_get_used_size(VirtIODevice *vdev, int n)
|
814 |
{ |
815 |
return offsetof(VRingUsed, ring) +
|
816 |
sizeof(VRingUsedElem) * vdev->vq[n].vring.num;
|
817 |
} |
818 |
|
819 |
target_phys_addr_t virtio_queue_get_ring_size(VirtIODevice *vdev, int n)
|
820 |
{ |
821 |
return vdev->vq[n].vring.used - vdev->vq[n].vring.desc +
|
822 |
virtio_queue_get_used_size(vdev, n); |
823 |
} |
824 |
|
825 |
uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n)
|
826 |
{ |
827 |
return vdev->vq[n].last_avail_idx;
|
828 |
} |
829 |
|
830 |
void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx) |
831 |
{ |
832 |
vdev->vq[n].last_avail_idx = idx; |
833 |
} |
834 |
|
835 |
VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n)
|
836 |
{ |
837 |
return vdev->vq + n;
|
838 |
} |
839 |
|
840 |
EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq) |
841 |
{ |
842 |
return &vq->guest_notifier;
|
843 |
} |
844 |
EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq) |
845 |
{ |
846 |
return &vq->host_notifier;
|
847 |
} |