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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 "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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*/
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#define wmb() do { } while (0) |
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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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void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
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}; |
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#define VIRTIO_PCI_QUEUE_MAX 16 |
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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(VirtQueue *vq, int i) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.desc + 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(VirtQueue *vq, int i) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.desc + 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(VirtQueue *vq, int i) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.desc + 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(VirtQueue *vq, int i) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.desc + 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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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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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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fprintf(stderr, "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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fprintf(stderr, "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(VirtQueue *vq, unsigned int i) |
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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(vq, i) & VRING_DESC_F_NEXT))
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return vq->vring.num;
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/* Check they're not leading us off end of descriptors. */
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next = vring_desc_next(vq, 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 >= vq->vring.num) {
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fprintf(stderr, "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 num_bufs, in_total, out_total;
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idx = vq->last_avail_idx; |
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num_bufs = in_total = out_total = 0;
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while (virtqueue_num_heads(vq, idx)) {
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int i;
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i = virtqueue_get_head(vq, idx++); |
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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 > vq->vring.num) {
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fprintf(stderr, "Looped descriptor");
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exit(1);
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} |
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if (vring_desc_flags(vq, i) & VRING_DESC_F_WRITE) {
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if (in_bytes > 0 && |
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(in_total += vring_desc_len(vq, 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(vq, i)) >= out_bytes) |
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return 1; |
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} |
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} while ((i = virtqueue_next_desc(vq, i)) != vq->vring.num);
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} |
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return 0; |
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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; |
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target_phys_addr_t len; |
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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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i = head = virtqueue_get_head(vq, vq->last_avail_idx++); |
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do {
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struct iovec *sg;
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int is_write = 0; |
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if (vring_desc_flags(vq, i) & VRING_DESC_F_WRITE) {
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elem->in_addr[elem->in_num] = vring_desc_addr(vq, i); |
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sg = &elem->in_sg[elem->in_num++]; |
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is_write = 1;
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} else
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sg = &elem->out_sg[elem->out_num++]; |
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/* Grab the first descriptor, and check it's OK. */
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sg->iov_len = vring_desc_len(vq, i); |
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len = sg->iov_len; |
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sg->iov_base = cpu_physical_memory_map(vring_desc_addr(vq, i), &len, is_write); |
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if (sg->iov_base == NULL || len != sg->iov_len) { |
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fprintf(stderr, "virtio: trying to map MMIO memory\n");
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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 ((elem->in_num + elem->out_num) > vq->vring.num) {
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fprintf(stderr, "Looped descriptor");
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exit(1);
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} |
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} while ((i = virtqueue_next_desc(vq, i)) != vq->vring.num);
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elem->index = head; |
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vq->inuse++; |
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return elem->in_num + elem->out_num;
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} |
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/* virtio device */
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void virtio_update_irq(VirtIODevice *vdev)
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{ |
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if (vdev->binding->update_irq) {
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vdev->binding->update_irq(vdev->binding_opaque); |
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} |
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} |
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void virtio_reset(void *opaque) |
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{ |
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VirtIODevice *vdev = opaque; |
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int i;
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if (vdev->reset)
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vdev->reset(vdev); |
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vdev->features = 0;
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vdev->queue_sel = 0;
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vdev->status = 0;
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vdev->isr = 0;
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virtio_update_irq(vdev); |
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for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
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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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} |
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} |
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uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr) |
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{ |
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uint8_t val; |
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vdev->get_config(vdev, vdev->config); |
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if (addr > (vdev->config_len - sizeof(val))) |
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return (uint32_t)-1; |
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memcpy(&val, vdev->config + addr, sizeof(val));
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return val;
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} |
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uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr) |
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{ |
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uint16_t val; |
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vdev->get_config(vdev, vdev->config); |
425 |
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if (addr > (vdev->config_len - sizeof(val))) |
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return (uint32_t)-1; |
428 |
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memcpy(&val, vdev->config + addr, sizeof(val));
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return val;
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} |
432 |
|
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uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr) |
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{ |
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uint32_t val; |
436 |
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vdev->get_config(vdev, vdev->config); |
438 |
|
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if (addr > (vdev->config_len - sizeof(val))) |
440 |
return (uint32_t)-1; |
441 |
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memcpy(&val, vdev->config + addr, sizeof(val));
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return val;
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} |
445 |
|
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void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data)
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{ |
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uint8_t val = data; |
449 |
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if (addr > (vdev->config_len - sizeof(val))) |
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return;
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452 |
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memcpy(vdev->config + addr, &val, sizeof(val));
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|
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if (vdev->set_config)
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vdev->set_config(vdev, vdev->config); |
457 |
} |
458 |
|
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void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
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{ |
461 |
uint16_t val = data; |
462 |
|
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if (addr > (vdev->config_len - sizeof(val))) |
464 |
return;
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465 |
|
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memcpy(vdev->config + addr, &val, sizeof(val));
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467 |
|
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if (vdev->set_config)
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vdev->set_config(vdev, vdev->config); |
470 |
} |
471 |
|
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void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data)
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{ |
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uint32_t val = data; |
475 |
|
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if (addr > (vdev->config_len - sizeof(val))) |
477 |
return;
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478 |
|
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memcpy(vdev->config + addr, &val, sizeof(val));
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|
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if (vdev->set_config)
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vdev->set_config(vdev, vdev->config); |
483 |
} |
484 |
|
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void virtio_queue_set_addr(VirtIODevice *vdev, int n, target_phys_addr_t addr) |
486 |
{ |
487 |
if (addr == 0) { |
488 |
virtio_reset(vdev); |
489 |
} else {
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vdev->vq[n].pa = addr; |
491 |
virtqueue_init(&vdev->vq[n]); |
492 |
} |
493 |
} |
494 |
|
495 |
target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n)
|
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{ |
497 |
return vdev->vq[n].pa;
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} |
499 |
|
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int virtio_queue_get_num(VirtIODevice *vdev, int n) |
501 |
{ |
502 |
return vdev->vq[n].vring.num;
|
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} |
504 |
|
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void virtio_queue_notify(VirtIODevice *vdev, int n) |
506 |
{ |
507 |
if (n < VIRTIO_PCI_QUEUE_MAX && vdev->vq[n].vring.desc) {
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vdev->vq[n].handle_output(vdev, &vdev->vq[n]); |
509 |
} |
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} |
511 |
|
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VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
|
513 |
void (*handle_output)(VirtIODevice *, VirtQueue *))
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{ |
515 |
int i;
|
516 |
|
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for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
518 |
if (vdev->vq[i].vring.num == 0) |
519 |
break;
|
520 |
} |
521 |
|
522 |
if (i == VIRTIO_PCI_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE)
|
523 |
abort(); |
524 |
|
525 |
vdev->vq[i].vring.num = queue_size; |
526 |
vdev->vq[i].handle_output = handle_output; |
527 |
|
528 |
return &vdev->vq[i];
|
529 |
} |
530 |
|
531 |
void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
|
532 |
{ |
533 |
/* Always notify when queue is empty (when feature acknowledge) */
|
534 |
if ((vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT) &&
|
535 |
(!(vdev->features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) ||
|
536 |
(vq->inuse || vring_avail_idx(vq) != vq->last_avail_idx))) |
537 |
return;
|
538 |
|
539 |
vdev->isr |= 0x01;
|
540 |
virtio_update_irq(vdev); |
541 |
} |
542 |
|
543 |
void virtio_notify_config(VirtIODevice *vdev)
|
544 |
{ |
545 |
if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
|
546 |
return;
|
547 |
|
548 |
vdev->isr |= 0x03;
|
549 |
virtio_update_irq(vdev); |
550 |
} |
551 |
|
552 |
void virtio_save(VirtIODevice *vdev, QEMUFile *f)
|
553 |
{ |
554 |
int i;
|
555 |
|
556 |
/* FIXME: load/save binding. */
|
557 |
//pci_device_save(&vdev->pci_dev, f);
|
558 |
|
559 |
qemu_put_8s(f, &vdev->status); |
560 |
qemu_put_8s(f, &vdev->isr); |
561 |
qemu_put_be16s(f, &vdev->queue_sel); |
562 |
qemu_put_be32s(f, &vdev->features); |
563 |
qemu_put_be32(f, vdev->config_len); |
564 |
qemu_put_buffer(f, vdev->config, vdev->config_len); |
565 |
|
566 |
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
567 |
if (vdev->vq[i].vring.num == 0) |
568 |
break;
|
569 |
} |
570 |
|
571 |
qemu_put_be32(f, i); |
572 |
|
573 |
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
574 |
if (vdev->vq[i].vring.num == 0) |
575 |
break;
|
576 |
|
577 |
qemu_put_be32(f, vdev->vq[i].vring.num); |
578 |
qemu_put_be64(f, vdev->vq[i].pa); |
579 |
qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); |
580 |
} |
581 |
} |
582 |
|
583 |
void virtio_load(VirtIODevice *vdev, QEMUFile *f)
|
584 |
{ |
585 |
int num, i;
|
586 |
|
587 |
/* FIXME: load/save binding. */
|
588 |
//pci_device_load(&vdev->pci_dev, f);
|
589 |
|
590 |
qemu_get_8s(f, &vdev->status); |
591 |
qemu_get_8s(f, &vdev->isr); |
592 |
qemu_get_be16s(f, &vdev->queue_sel); |
593 |
qemu_get_be32s(f, &vdev->features); |
594 |
vdev->config_len = qemu_get_be32(f); |
595 |
qemu_get_buffer(f, vdev->config, vdev->config_len); |
596 |
|
597 |
num = qemu_get_be32(f); |
598 |
|
599 |
for (i = 0; i < num; i++) { |
600 |
vdev->vq[i].vring.num = qemu_get_be32(f); |
601 |
vdev->vq[i].pa = qemu_get_be64(f); |
602 |
qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); |
603 |
|
604 |
if (vdev->vq[i].pa) {
|
605 |
virtqueue_init(&vdev->vq[i]); |
606 |
} |
607 |
} |
608 |
|
609 |
virtio_update_irq(vdev); |
610 |
} |
611 |
|
612 |
void virtio_cleanup(VirtIODevice *vdev)
|
613 |
{ |
614 |
if (vdev->config)
|
615 |
qemu_free(vdev->config); |
616 |
qemu_free(vdev->vq); |
617 |
} |
618 |
|
619 |
VirtIODevice *virtio_common_init(const char *name, uint16_t device_id, |
620 |
size_t config_size, size_t struct_size) |
621 |
{ |
622 |
VirtIODevice *vdev; |
623 |
|
624 |
vdev = qemu_mallocz(struct_size); |
625 |
|
626 |
vdev->device_id = device_id; |
627 |
vdev->status = 0;
|
628 |
vdev->isr = 0;
|
629 |
vdev->queue_sel = 0;
|
630 |
vdev->vq = qemu_mallocz(sizeof(VirtQueue) * VIRTIO_PCI_QUEUE_MAX);
|
631 |
|
632 |
vdev->name = name; |
633 |
vdev->config_len = config_size; |
634 |
if (vdev->config_len)
|
635 |
vdev->config = qemu_mallocz(config_size); |
636 |
else
|
637 |
vdev->config = NULL;
|
638 |
|
639 |
qemu_register_reset(virtio_reset, 0, vdev);
|
640 |
|
641 |
return vdev;
|
642 |
} |
643 |
|
644 |
void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding, |
645 |
void *opaque)
|
646 |
{ |
647 |
vdev->binding = binding; |
648 |
vdev->binding_opaque = opaque; |
649 |
} |