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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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/* from Linux's linux/virtio_pci.h */
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/* A 32-bit r/o bitmask of the features supported by the host */
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#define VIRTIO_PCI_HOST_FEATURES 0 |
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/* A 32-bit r/w bitmask of features activated by the guest */
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#define VIRTIO_PCI_GUEST_FEATURES 4 |
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/* A 32-bit r/w PFN for the currently selected queue */
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#define VIRTIO_PCI_QUEUE_PFN 8 |
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/* A 16-bit r/o queue size for the currently selected queue */
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#define VIRTIO_PCI_QUEUE_NUM 12 |
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/* A 16-bit r/w queue selector */
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#define VIRTIO_PCI_QUEUE_SEL 14 |
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/* A 16-bit r/w queue notifier */
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#define VIRTIO_PCI_QUEUE_NOTIFY 16 |
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/* An 8-bit device status register. */
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#define VIRTIO_PCI_STATUS 18 |
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/* An 8-bit r/o interrupt status register. Reading the value will return the
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* current contents of the ISR and will also clear it. This is effectively
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* a read-and-acknowledge. */
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#define VIRTIO_PCI_ISR 19 |
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#define VIRTIO_PCI_CONFIG 20 |
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/* Virtio ABI version, if we increment this, we break the guest driver. */
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#define VIRTIO_PCI_ABI_VERSION 0 |
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/* How many bits to shift physical queue address written to QUEUE_PFN.
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* 12 is historical, and due to x86 page size. */
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#define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12 |
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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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uint32_t pfn; |
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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, target_phys_addr_t pa) |
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{ |
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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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|
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/* virtio device */
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static VirtIODevice *to_virtio_device(PCIDevice *pci_dev)
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{ |
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return (VirtIODevice *)pci_dev;
|
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} |
416 |
|
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static void virtio_update_irq(VirtIODevice *vdev) |
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{ |
419 |
qemu_set_irq(vdev->pci_dev.irq[0], vdev->isr & 1); |
420 |
} |
421 |
|
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static void virtio_reset(void *opaque) |
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{ |
424 |
VirtIODevice *vdev = opaque; |
425 |
int i;
|
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|
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if (vdev->reset)
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vdev->reset(vdev); |
429 |
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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); |
435 |
|
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for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
437 |
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].pfn = 0;
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} |
443 |
} |
444 |
|
445 |
static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val) |
446 |
{ |
447 |
VirtIODevice *vdev = to_virtio_device(opaque); |
448 |
ram_addr_t pa; |
449 |
|
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addr -= vdev->addr; |
451 |
|
452 |
switch (addr) {
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case VIRTIO_PCI_GUEST_FEATURES:
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454 |
/* Guest does not negotiate properly? We have to assume nothing. */
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455 |
if (val & (1 << VIRTIO_F_BAD_FEATURE)) { |
456 |
if (vdev->bad_features)
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val = vdev->bad_features(vdev); |
458 |
else
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val = 0;
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} |
461 |
if (vdev->set_features)
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vdev->set_features(vdev, val); |
463 |
vdev->features = val; |
464 |
break;
|
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case VIRTIO_PCI_QUEUE_PFN:
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466 |
pa = (ram_addr_t)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT; |
467 |
vdev->vq[vdev->queue_sel].pfn = val; |
468 |
if (pa == 0) { |
469 |
virtio_reset(vdev); |
470 |
} else {
|
471 |
virtqueue_init(&vdev->vq[vdev->queue_sel], pa); |
472 |
} |
473 |
break;
|
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case VIRTIO_PCI_QUEUE_SEL:
|
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if (val < VIRTIO_PCI_QUEUE_MAX)
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vdev->queue_sel = val; |
477 |
break;
|
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case VIRTIO_PCI_QUEUE_NOTIFY:
|
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if (val < VIRTIO_PCI_QUEUE_MAX && vdev->vq[val].vring.desc)
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vdev->vq[val].handle_output(vdev, &vdev->vq[val]); |
481 |
break;
|
482 |
case VIRTIO_PCI_STATUS:
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483 |
vdev->status = val & 0xFF;
|
484 |
if (vdev->status == 0) |
485 |
virtio_reset(vdev); |
486 |
break;
|
487 |
} |
488 |
} |
489 |
|
490 |
static uint32_t virtio_ioport_read(void *opaque, uint32_t addr) |
491 |
{ |
492 |
VirtIODevice *vdev = to_virtio_device(opaque); |
493 |
uint32_t ret = 0xFFFFFFFF;
|
494 |
|
495 |
addr -= vdev->addr; |
496 |
|
497 |
switch (addr) {
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498 |
case VIRTIO_PCI_HOST_FEATURES:
|
499 |
ret = vdev->get_features(vdev); |
500 |
ret |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY) | (1 << VIRTIO_F_BAD_FEATURE); |
501 |
break;
|
502 |
case VIRTIO_PCI_GUEST_FEATURES:
|
503 |
ret = vdev->features; |
504 |
break;
|
505 |
case VIRTIO_PCI_QUEUE_PFN:
|
506 |
ret = vdev->vq[vdev->queue_sel].pfn; |
507 |
break;
|
508 |
case VIRTIO_PCI_QUEUE_NUM:
|
509 |
ret = vdev->vq[vdev->queue_sel].vring.num; |
510 |
break;
|
511 |
case VIRTIO_PCI_QUEUE_SEL:
|
512 |
ret = vdev->queue_sel; |
513 |
break;
|
514 |
case VIRTIO_PCI_STATUS:
|
515 |
ret = vdev->status; |
516 |
break;
|
517 |
case VIRTIO_PCI_ISR:
|
518 |
/* reading from the ISR also clears it. */
|
519 |
ret = vdev->isr; |
520 |
vdev->isr = 0;
|
521 |
virtio_update_irq(vdev); |
522 |
break;
|
523 |
default:
|
524 |
break;
|
525 |
} |
526 |
|
527 |
return ret;
|
528 |
} |
529 |
|
530 |
static uint32_t virtio_config_readb(void *opaque, uint32_t addr) |
531 |
{ |
532 |
VirtIODevice *vdev = opaque; |
533 |
uint8_t val; |
534 |
|
535 |
vdev->get_config(vdev, vdev->config); |
536 |
|
537 |
addr -= vdev->addr + VIRTIO_PCI_CONFIG; |
538 |
if (addr > (vdev->config_len - sizeof(val))) |
539 |
return (uint32_t)-1; |
540 |
|
541 |
memcpy(&val, vdev->config + addr, sizeof(val));
|
542 |
return val;
|
543 |
} |
544 |
|
545 |
static uint32_t virtio_config_readw(void *opaque, uint32_t addr) |
546 |
{ |
547 |
VirtIODevice *vdev = opaque; |
548 |
uint16_t val; |
549 |
|
550 |
vdev->get_config(vdev, vdev->config); |
551 |
|
552 |
addr -= vdev->addr + VIRTIO_PCI_CONFIG; |
553 |
if (addr > (vdev->config_len - sizeof(val))) |
554 |
return (uint32_t)-1; |
555 |
|
556 |
memcpy(&val, vdev->config + addr, sizeof(val));
|
557 |
return val;
|
558 |
} |
559 |
|
560 |
static uint32_t virtio_config_readl(void *opaque, uint32_t addr) |
561 |
{ |
562 |
VirtIODevice *vdev = opaque; |
563 |
uint32_t val; |
564 |
|
565 |
vdev->get_config(vdev, vdev->config); |
566 |
|
567 |
addr -= vdev->addr + VIRTIO_PCI_CONFIG; |
568 |
if (addr > (vdev->config_len - sizeof(val))) |
569 |
return (uint32_t)-1; |
570 |
|
571 |
memcpy(&val, vdev->config + addr, sizeof(val));
|
572 |
return val;
|
573 |
} |
574 |
|
575 |
static void virtio_config_writeb(void *opaque, uint32_t addr, uint32_t data) |
576 |
{ |
577 |
VirtIODevice *vdev = opaque; |
578 |
uint8_t val = data; |
579 |
|
580 |
addr -= vdev->addr + VIRTIO_PCI_CONFIG; |
581 |
if (addr > (vdev->config_len - sizeof(val))) |
582 |
return;
|
583 |
|
584 |
memcpy(vdev->config + addr, &val, sizeof(val));
|
585 |
|
586 |
if (vdev->set_config)
|
587 |
vdev->set_config(vdev, vdev->config); |
588 |
} |
589 |
|
590 |
static void virtio_config_writew(void *opaque, uint32_t addr, uint32_t data) |
591 |
{ |
592 |
VirtIODevice *vdev = opaque; |
593 |
uint16_t val = data; |
594 |
|
595 |
addr -= vdev->addr + VIRTIO_PCI_CONFIG; |
596 |
if (addr > (vdev->config_len - sizeof(val))) |
597 |
return;
|
598 |
|
599 |
memcpy(vdev->config + addr, &val, sizeof(val));
|
600 |
|
601 |
if (vdev->set_config)
|
602 |
vdev->set_config(vdev, vdev->config); |
603 |
} |
604 |
|
605 |
static void virtio_config_writel(void *opaque, uint32_t addr, uint32_t data) |
606 |
{ |
607 |
VirtIODevice *vdev = opaque; |
608 |
uint32_t val = data; |
609 |
|
610 |
addr -= vdev->addr + VIRTIO_PCI_CONFIG; |
611 |
if (addr > (vdev->config_len - sizeof(val))) |
612 |
return;
|
613 |
|
614 |
memcpy(vdev->config + addr, &val, sizeof(val));
|
615 |
|
616 |
if (vdev->set_config)
|
617 |
vdev->set_config(vdev, vdev->config); |
618 |
} |
619 |
|
620 |
static void virtio_map(PCIDevice *pci_dev, int region_num, |
621 |
uint32_t addr, uint32_t size, int type)
|
622 |
{ |
623 |
VirtIODevice *vdev = to_virtio_device(pci_dev); |
624 |
int i;
|
625 |
|
626 |
vdev->addr = addr; |
627 |
for (i = 0; i < 3; i++) { |
628 |
register_ioport_write(addr, 20, 1 << i, virtio_ioport_write, vdev); |
629 |
register_ioport_read(addr, 20, 1 << i, virtio_ioport_read, vdev); |
630 |
} |
631 |
|
632 |
if (vdev->config_len) {
|
633 |
register_ioport_write(addr + 20, vdev->config_len, 1, |
634 |
virtio_config_writeb, vdev); |
635 |
register_ioport_write(addr + 20, vdev->config_len, 2, |
636 |
virtio_config_writew, vdev); |
637 |
register_ioport_write(addr + 20, vdev->config_len, 4, |
638 |
virtio_config_writel, vdev); |
639 |
register_ioport_read(addr + 20, vdev->config_len, 1, |
640 |
virtio_config_readb, vdev); |
641 |
register_ioport_read(addr + 20, vdev->config_len, 2, |
642 |
virtio_config_readw, vdev); |
643 |
register_ioport_read(addr + 20, vdev->config_len, 4, |
644 |
virtio_config_readl, vdev); |
645 |
|
646 |
vdev->get_config(vdev, vdev->config); |
647 |
} |
648 |
} |
649 |
|
650 |
VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
|
651 |
void (*handle_output)(VirtIODevice *, VirtQueue *))
|
652 |
{ |
653 |
int i;
|
654 |
|
655 |
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
656 |
if (vdev->vq[i].vring.num == 0) |
657 |
break;
|
658 |
} |
659 |
|
660 |
if (i == VIRTIO_PCI_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE)
|
661 |
abort(); |
662 |
|
663 |
vdev->vq[i].vring.num = queue_size; |
664 |
vdev->vq[i].handle_output = handle_output; |
665 |
|
666 |
return &vdev->vq[i];
|
667 |
} |
668 |
|
669 |
void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
|
670 |
{ |
671 |
/* Always notify when queue is empty (when feature acknowledge) */
|
672 |
if ((vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT) &&
|
673 |
(!(vdev->features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) ||
|
674 |
(vq->inuse || vring_avail_idx(vq) != vq->last_avail_idx))) |
675 |
return;
|
676 |
|
677 |
vdev->isr |= 0x01;
|
678 |
virtio_update_irq(vdev); |
679 |
} |
680 |
|
681 |
void virtio_notify_config(VirtIODevice *vdev)
|
682 |
{ |
683 |
if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
|
684 |
return;
|
685 |
|
686 |
vdev->isr |= 0x03;
|
687 |
virtio_update_irq(vdev); |
688 |
} |
689 |
|
690 |
void virtio_save(VirtIODevice *vdev, QEMUFile *f)
|
691 |
{ |
692 |
int i;
|
693 |
|
694 |
pci_device_save(&vdev->pci_dev, f); |
695 |
|
696 |
qemu_put_be32s(f, &vdev->addr); |
697 |
qemu_put_8s(f, &vdev->status); |
698 |
qemu_put_8s(f, &vdev->isr); |
699 |
qemu_put_be16s(f, &vdev->queue_sel); |
700 |
qemu_put_be32s(f, &vdev->features); |
701 |
qemu_put_be32(f, vdev->config_len); |
702 |
qemu_put_buffer(f, vdev->config, vdev->config_len); |
703 |
|
704 |
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
705 |
if (vdev->vq[i].vring.num == 0) |
706 |
break;
|
707 |
} |
708 |
|
709 |
qemu_put_be32(f, i); |
710 |
|
711 |
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
712 |
if (vdev->vq[i].vring.num == 0) |
713 |
break;
|
714 |
|
715 |
qemu_put_be32(f, vdev->vq[i].vring.num); |
716 |
qemu_put_be32s(f, &vdev->vq[i].pfn); |
717 |
qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); |
718 |
} |
719 |
} |
720 |
|
721 |
void virtio_load(VirtIODevice *vdev, QEMUFile *f)
|
722 |
{ |
723 |
int num, i;
|
724 |
|
725 |
pci_device_load(&vdev->pci_dev, f); |
726 |
|
727 |
qemu_get_be32s(f, &vdev->addr); |
728 |
qemu_get_8s(f, &vdev->status); |
729 |
qemu_get_8s(f, &vdev->isr); |
730 |
qemu_get_be16s(f, &vdev->queue_sel); |
731 |
qemu_get_be32s(f, &vdev->features); |
732 |
vdev->config_len = qemu_get_be32(f); |
733 |
qemu_get_buffer(f, vdev->config, vdev->config_len); |
734 |
|
735 |
num = qemu_get_be32(f); |
736 |
|
737 |
for (i = 0; i < num; i++) { |
738 |
vdev->vq[i].vring.num = qemu_get_be32(f); |
739 |
qemu_get_be32s(f, &vdev->vq[i].pfn); |
740 |
qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); |
741 |
|
742 |
if (vdev->vq[i].pfn) {
|
743 |
target_phys_addr_t pa; |
744 |
|
745 |
pa = (ram_addr_t)vdev->vq[i].pfn << VIRTIO_PCI_QUEUE_ADDR_SHIFT; |
746 |
virtqueue_init(&vdev->vq[i], pa); |
747 |
} |
748 |
} |
749 |
|
750 |
virtio_update_irq(vdev); |
751 |
} |
752 |
|
753 |
void virtio_cleanup(VirtIODevice *vdev)
|
754 |
{ |
755 |
if (vdev->config)
|
756 |
qemu_free(vdev->config); |
757 |
qemu_free(vdev->vq); |
758 |
} |
759 |
|
760 |
VirtIODevice *virtio_init_pci(PCIBus *bus, const char *name, |
761 |
uint16_t vendor, uint16_t device, |
762 |
uint16_t subvendor, uint16_t subdevice, |
763 |
uint16_t class_code, uint8_t pif, |
764 |
size_t config_size, size_t struct_size) |
765 |
{ |
766 |
VirtIODevice *vdev; |
767 |
PCIDevice *pci_dev; |
768 |
uint8_t *config; |
769 |
uint32_t size; |
770 |
|
771 |
pci_dev = pci_register_device(bus, name, struct_size, |
772 |
-1, NULL, NULL); |
773 |
if (!pci_dev)
|
774 |
return NULL; |
775 |
|
776 |
vdev = to_virtio_device(pci_dev); |
777 |
|
778 |
vdev->status = 0;
|
779 |
vdev->isr = 0;
|
780 |
vdev->queue_sel = 0;
|
781 |
vdev->vq = qemu_mallocz(sizeof(VirtQueue) * VIRTIO_PCI_QUEUE_MAX);
|
782 |
|
783 |
config = pci_dev->config; |
784 |
pci_config_set_vendor_id(config, vendor); |
785 |
pci_config_set_device_id(config, device); |
786 |
|
787 |
config[0x08] = VIRTIO_PCI_ABI_VERSION;
|
788 |
|
789 |
config[0x09] = pif;
|
790 |
pci_config_set_class(config, class_code); |
791 |
config[0x0e] = 0x00; |
792 |
|
793 |
config[0x2c] = subvendor & 0xFF; |
794 |
config[0x2d] = (subvendor >> 8) & 0xFF; |
795 |
config[0x2e] = subdevice & 0xFF; |
796 |
config[0x2f] = (subdevice >> 8) & 0xFF; |
797 |
|
798 |
config[0x3d] = 1; |
799 |
|
800 |
vdev->name = name; |
801 |
vdev->config_len = config_size; |
802 |
if (vdev->config_len)
|
803 |
vdev->config = qemu_mallocz(config_size); |
804 |
else
|
805 |
vdev->config = NULL;
|
806 |
|
807 |
size = 20 + config_size;
|
808 |
if (size & (size-1)) |
809 |
size = 1 << qemu_fls(size);
|
810 |
|
811 |
pci_register_io_region(pci_dev, 0, size, PCI_ADDRESS_SPACE_IO,
|
812 |
virtio_map); |
813 |
qemu_register_reset(virtio_reset, vdev); |
814 |
|
815 |
return vdev;
|
816 |
} |