| 1 |
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| 2 | #ifndef _LINUX_VIRTIO_CONFIG_H
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| 3 | #define _LINUX_VIRTIO_CONFIG_H
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| 4 |
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| 5 | #include <linux/err.h>
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| 6 | #include <linux/bug.h>
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| 7 | #include <linux/virtio.h>
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| 8 | #include <linux/virtio_byteorder.h>
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| 9 | #include <linux/compiler_types.h>
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| 10 | #include <uapi/linux/virtio_config.h>
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| 11 |
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| 12 | struct irq_affinity;
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| 13 |
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| 14 | struct virtio_shm_region {
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| 15 | u64 addr;
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| 16 | u64 len;
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| 17 | };
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| 18 |
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| 19 | typedef void vq_callback_t(struct virtqueue *);
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| 20 |
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| 21 | |
| 22 | * struct virtqueue_info - Info for a virtqueue passed to find_vqs().
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| 23 | * @name: virtqueue description. Used mainly for debugging, NULL for
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| 24 | * a virtqueue unused by the driver.
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| 25 | * @callback: A callback to invoke on a used buffer notification.
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| 26 | * NULL for a virtqueue that does not need a callback.
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| 27 | * @ctx: whether to maintain an extra context per virtqueue.
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| 28 |
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| 29 | struct virtqueue_info {
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| 30 | const char *name;
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| 31 | vq_callback_t *callback;
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| 32 | bool ctx;
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| 33 | };
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| 34 |
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| 35 | |
| 36 | * struct virtio_config_ops - operations for configuring a virtio device
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| 37 | * Note: Do not assume that a transport implements all of the operations
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| 38 | * getting/setting a value as a simple read/write! Generally speaking,
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| 39 | * any of @get/@set, @get_status/@set_status, or @get_features/
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| 40 | * @finalize_features are NOT safe to be called from an atomic
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| 41 | * context.
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| 42 | * @get: read the value of a configuration field
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| 43 | * vdev: the virtio_device
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| 44 | * offset: the offset of the configuration field
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| 45 | * buf: the buffer to write the field value into.
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| 46 | * len: the length of the buffer
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| 47 | * @set: write the value of a configuration field
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| 48 | * vdev: the virtio_device
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| 49 | * offset: the offset of the configuration field
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| 50 | * buf: the buffer to read the field value from.
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| 51 | * len: the length of the buffer
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| 52 | * @generation: config generation counter (optional)
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| 53 | * vdev: the virtio_device
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| 54 | * Returns the config generation counter
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| 55 | * @get_status: read the status byte
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| 56 | * vdev: the virtio_device
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| 57 | * Returns the status byte
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| 58 | * @set_status: write the status byte
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| 59 | * vdev: the virtio_device
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| 60 | * status: the new status byte
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| 61 | * @reset: reset the device
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| 62 | * vdev: the virtio device
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| 63 | * After this, status and feature negotiation must be done again
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| 64 | * Device must not be reset from its vq/config callbacks, or in
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| 65 | * parallel with being added/removed.
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| 66 | * @find_vqs: find virtqueues and instantiate them.
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| 67 | * vdev: the virtio_device
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| 68 | * nvqs: the number of virtqueues to find
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| 69 | * vqs: on success, includes new virtqueues
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| 70 | * vqs_info: array of virtqueue info structures
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| 71 | * Returns 0 on success or error status
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| 72 | * @del_vqs: free virtqueues found by find_vqs().
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| 73 | * @synchronize_cbs: synchronize with the virtqueue callbacks (optional)
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| 74 | * The function guarantees that all memory operations on the
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| 75 | * queue before it are visible to the vring_interrupt() that is
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| 76 | * called after it.
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| 77 | * vdev: the virtio_device
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| 78 | * @get_features: get the array of feature bits for this device.
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| 79 | * vdev: the virtio_device
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| 80 | * Returns the first 64 feature bits.
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| 81 | * @get_extended_features:
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| 82 | * vdev: the virtio_device
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| 83 | * Returns the first VIRTIO_FEATURES_BITS feature bits (all we currently
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| 84 | * need).
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| 85 | * @finalize_features: confirm what device features we'll be using.
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| 86 | * vdev: the virtio_device
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| 87 | * This sends the driver feature bits to the device: it can change
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| 88 | * the dev->feature bits if it wants.
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| 89 | * Note that despite the name this can be called any number of
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| 90 | * times.
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| 91 | * Returns 0 on success or error status
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| 92 | * @bus_name: return the bus name associated with the device (optional)
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| 93 | * vdev: the virtio_device
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| 94 | * This returns a pointer to the bus name a la pci_name from which
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| 95 | * the caller can then copy.
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| 96 | * @set_vq_affinity: set the affinity for a virtqueue (optional).
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| 97 | * @get_vq_affinity: get the affinity for a virtqueue (optional).
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| 98 | * @get_shm_region: get a shared memory region based on the index.
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| 99 | * @disable_vq_and_reset: reset a queue individually (optional).
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| 100 | * vq: the virtqueue
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| 101 | * Returns 0 on success or error status
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| 102 | * disable_vq_and_reset will guarantee that the callbacks are disabled and
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| 103 | * synchronized.
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| 104 | * Except for the callback, the caller should guarantee that the vring is
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| 105 | * not accessed by any functions of virtqueue.
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| 106 | * @enable_vq_after_reset: enable a reset queue
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| 107 | * vq: the virtqueue
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| 108 | * Returns 0 on success or error status
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| 109 | * If disable_vq_and_reset is set, then enable_vq_after_reset must also be
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| 110 | * set.
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| 111 |
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| 112 | struct virtio_config_ops {
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| 113 | void (*get)(struct virtio_device *vdev, unsigned offset,
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| 114 | void *buf, unsigned len);
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| 115 | void (*set)(struct virtio_device *vdev, unsigned offset,
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| 116 | const void *buf, unsigned len);
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| 117 | u32 (*generation)(struct virtio_device *vdev);
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| 118 | u8 (*get_status)(struct virtio_device *vdev);
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| 119 | void (*set_status)(struct virtio_device *vdev, u8 status);
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| 120 | void (*reset)(struct virtio_device *vdev);
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| 121 | int (*find_vqs)(struct virtio_device *vdev, unsigned int nvqs,
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| 122 | struct virtqueue *vqs[],
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| 123 | struct virtqueue_info vqs_info[],
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| 124 | struct irq_affinity *desc);
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| 125 | void (*del_vqs)(struct virtio_device *);
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| 126 | void (*synchronize_cbs)(struct virtio_device *);
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| 127 | u64 (*get_features)(struct virtio_device *vdev);
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| 128 | void (*get_extended_features)(struct virtio_device *vdev,
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| 129 | u64 *features);
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| 130 | int (*finalize_features)(struct virtio_device *vdev);
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| 131 | const char *(*bus_name)(struct virtio_device *vdev);
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| 132 | int (*set_vq_affinity)(struct virtqueue *vq,
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| 133 | const struct cpumask *cpu_mask);
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| 134 | const struct cpumask *(*get_vq_affinity)(struct virtio_device *vdev,
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| 135 | int index);
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| 136 | bool (*get_shm_region)(struct virtio_device *vdev,
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| 137 | struct virtio_shm_region *region, u8 id);
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| 138 | int (*disable_vq_and_reset)(struct virtqueue *vq);
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| 139 | int (*enable_vq_after_reset)(struct virtqueue *vq);
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| 140 | };
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| 141 |
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| 142 | |
| 143 | * struct virtio_map_ops - operations for mapping buffer for a virtio device
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| 144 | * Note: For a transport that has its own mapping logic it must
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| 145 | * implement all of the operations
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| 146 | * @map_page: map a buffer to the device
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| 147 | * map: metadata for performing mapping
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| 148 | * page: the page that will be mapped by the device
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| 149 | * offset: the offset in the page for a buffer
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| 150 | * size: the buffer size
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| 151 | * dir: mapping direction
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| 152 | * attrs: mapping attributes
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| 153 | * Returns the mapped address
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| 154 | * @unmap_page: unmap a buffer from the device
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| 155 | * map: device specific mapping map
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| 156 | * map_handle: the mapped address
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| 157 | * size: the buffer size
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| 158 | * dir: mapping direction
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| 159 | * attrs: unmapping attributes
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| 160 | * @sync_single_for_cpu: sync a single buffer from device to cpu
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| 161 | * map: metadata for performing mapping
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| 162 | * map_handle: the mapping address to sync
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| 163 | * size: the size of the buffer
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| 164 | * dir: synchronization direction
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| 165 | * @sync_single_for_device: sync a single buffer from cpu to device
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| 166 | * map: metadata for performing mapping
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| 167 | * map_handle: the mapping address to sync
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| 168 | * size: the size of the buffer
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| 169 | * dir: synchronization direction
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| 170 | * @alloc: alloc a coherent buffer mapping
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| 171 | * map: metadata for performing mapping
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| 172 | * size: the size of the buffer
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| 173 | * map_handle: the mapping address to sync
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| 174 | * gfp: allocation flag (GFP_XXX)
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| 175 | * Returns virtual address of the allocated buffer
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| 176 | * @free: free a coherent buffer mapping
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| 177 | * map: metadata for performing mapping
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| 178 | * size: the size of the buffer
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| 179 | * vaddr: virtual address of the buffer
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| 180 | * map_handle: the mapping address that needs to be freed
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| 181 | * attrs: unmapping attributes
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| 182 | * @need_sync: if the buffer needs synchronization
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| 183 | * map: metadata for performing mapping
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| 184 | * map_handle: the mapped address
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| 185 | * Returns whether the buffer needs synchronization
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| 186 | * @mapping_error: if the mapping address is error
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| 187 | * map: metadata for performing mapping
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| 188 | * map_handle: the mapped address
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| 189 | * @max_mapping_size: get the maximum buffer size that can be mapped
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| 190 | * map: metadata for performing mapping
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| 191 | * Returns the maximum buffer size that can be mapped
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| 192 |
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| 193 | struct virtio_map_ops {
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| 194 | dma_addr_t (*map_page)(union virtio_map map, struct page *page,
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| 195 | unsigned long offset, size_t size,
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| 196 | enum dma_data_direction dir, unsigned long attrs);
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| 197 | void (*unmap_page)(union virtio_map map, dma_addr_t map_handle,
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| 198 | size_t size, enum dma_data_direction dir,
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| 199 | unsigned long attrs);
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| 200 | void (*sync_single_for_cpu)(union virtio_map map, dma_addr_t map_handle,
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| 201 | size_t size, enum dma_data_direction dir);
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| 202 | void (*sync_single_for_device)(union virtio_map map,
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| 203 | dma_addr_t map_handle, size_t size,
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| 204 | enum dma_data_direction dir);
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| 205 | void *(*alloc)(union virtio_map map, size_t size,
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| 206 | dma_addr_t *map_handle, gfp_t gfp);
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| 207 | void (*free)(union virtio_map map, size_t size, void *vaddr,
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| 208 | dma_addr_t map_handle, unsigned long attrs);
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| 209 | bool (*need_sync)(union virtio_map map, dma_addr_t map_handle);
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| 210 | int (*mapping_error)(union virtio_map map, dma_addr_t map_handle);
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| 211 | size_t (*max_mapping_size)(union virtio_map map);
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| 212 | };
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| 213 |
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| 214 |
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| 215 | void virtio_check_driver_offered_feature(const struct virtio_device *vdev,
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| 216 | unsigned int fbit);
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| 217 |
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| 218 | |
| 219 | * __virtio_test_bit - helper to test feature bits. For use by transports.
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| 220 | * Devices should normally use virtio_has_feature,
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| 221 | * which includes more checks.
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| 222 | * @vdev: the device
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| 223 | * @fbit: the feature bit
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| 224 |
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| 225 | static inline bool __virtio_test_bit(const struct virtio_device *vdev,
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| 226 | unsigned int fbit)
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| 227 | {
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| 228 | return virtio_features_test_bit(vdev->features_array, fbit);
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| 229 | }
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| 230 |
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| 231 | |
| 232 | * __virtio_set_bit - helper to set feature bits. For use by transports.
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| 233 | * @vdev: the device
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| 234 | * @fbit: the feature bit
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| 235 |
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| 236 | static inline void __virtio_set_bit(struct virtio_device *vdev,
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| 237 | unsigned int fbit)
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| 238 | {
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| 239 | virtio_features_set_bit(vdev->features_array, fbit);
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| 240 | }
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| 241 |
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| 242 | |
| 243 | * __virtio_clear_bit - helper to clear feature bits. For use by transports.
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| 244 | * @vdev: the device
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| 245 | * @fbit: the feature bit
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| 246 |
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| 247 | static inline void __virtio_clear_bit(struct virtio_device *vdev,
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| 248 | unsigned int fbit)
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| 249 | {
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| 250 | virtio_features_clear_bit(vdev->features_array, fbit);
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| 251 | }
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| 252 |
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| 253 | |
| 254 | * virtio_has_feature - helper to determine if this device has this feature.
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| 255 | * @vdev: the device
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| 256 | * @fbit: the feature bit
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| 257 |
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| 258 | static inline bool virtio_has_feature(const struct virtio_device *vdev,
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| 259 | unsigned int fbit)
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| 260 | {
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| 261 | if (fbit < VIRTIO_TRANSPORT_F_START)
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| 262 | virtio_check_driver_offered_feature(vdev, fbit);
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| 263 |
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| 264 | return __virtio_test_bit(vdev, fbit);
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| 265 | }
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| 266 |
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| 267 | static inline void virtio_get_features(struct virtio_device *vdev,
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| 268 | u64 *features_out)
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| 269 | {
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| 270 | if (vdev->config->get_extended_features) {
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| 271 | vdev->config->get_extended_features(vdev, features_out);
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| 272 | return;
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| 273 | }
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| 274 |
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| 275 | virtio_features_from_u64(features_out,
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| 276 | vdev->config->get_features(vdev));
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| 277 | }
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| 278 |
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| 279 | |
| 280 | * virtio_has_dma_quirk - determine whether this device has the DMA quirk
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| 281 | * @vdev: the device
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| 282 |
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| 283 | static inline bool virtio_has_dma_quirk(const struct virtio_device *vdev)
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| 284 | {
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| 285 | |
| 286 | * Note the reverse polarity of the quirk feature (compared to most
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| 287 | * other features), this is for compatibility with legacy systems.
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| 288 |
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| 289 | return !virtio_has_feature(vdev, VIRTIO_F_ACCESS_PLATFORM);
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| 290 | }
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| 291 |
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| 292 | static inline
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| 293 | int virtio_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
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| 294 | struct virtqueue *vqs[],
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| 295 | struct virtqueue_info vqs_info[],
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| 296 | struct irq_affinity *desc)
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| 297 | {
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| 298 | return vdev->config->find_vqs(vdev, nvqs, vqs, vqs_info, desc);
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| 299 | }
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| 300 |
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| 301 | static inline
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| 302 | struct virtqueue *virtio_find_single_vq(struct virtio_device *vdev,
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| 303 | vq_callback_t *c, const char *n)
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| 304 | {
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| 305 | struct virtqueue_info vqs_info[] = {
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| 306 | { n, c },
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| 307 | };
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| 308 | struct virtqueue *vq;
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| 309 | int err = virtio_find_vqs(vdev, 1, &vq, vqs_info, NULL);
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| 310 |
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| 311 | if (err < 0)
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| 312 | return ERR_PTR(err);
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| 313 | return vq;
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| 314 | }
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| 315 |
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| 316 | |
| 317 | * virtio_synchronize_cbs - synchronize with virtqueue callbacks
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| 318 | * @dev: the virtio device
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| 319 |
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| 320 | static inline
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| 321 | void virtio_synchronize_cbs(struct virtio_device *dev)
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| 322 | {
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| 323 | if (dev->config->synchronize_cbs) {
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| 324 | dev->config->synchronize_cbs(dev);
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| 325 | } else {
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| 326 | |
| 327 | * A best effort fallback to synchronize with
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| 328 | * interrupts, preemption and softirq disabled
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| 329 | * regions. See comment above synchronize_rcu().
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| 330 |
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| 331 | synchronize_rcu();
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| 332 | }
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| 333 | }
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| 334 |
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| 335 | |
| 336 | * virtio_device_ready - enable vq use in probe function
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| 337 | * @dev: the virtio device
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| 338 | *
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| 339 | * Driver must call this to use vqs in the probe function.
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| 340 | *
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| 341 | * Note: vqs are enabled automatically after probe returns.
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| 342 |
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| 343 | static inline
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| 344 | void virtio_device_ready(struct virtio_device *dev)
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| 345 | {
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| 346 | unsigned status = dev->config->get_status(dev);
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| 347 |
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| 348 | WARN_ON(status & VIRTIO_CONFIG_S_DRIVER_OK);
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| 349 |
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| 350 | #ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION
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| 351 | |
| 352 | * The virtio_synchronize_cbs() makes sure vring_interrupt()
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| 353 | * will see the driver specific setup if it sees vq->broken
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| 354 | * as false (even if the notifications come before DRIVER_OK).
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| 355 |
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| 356 | virtio_synchronize_cbs(dev);
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| 357 | __virtio_unbreak_device(dev);
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| 358 | #endif
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| 359 | |
| 360 | * The transport should ensure the visibility of vq->broken
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| 361 | * before setting DRIVER_OK. See the comments for the transport
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| 362 | * specific set_status() method.
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| 363 | *
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| 364 | * A well behaved device will only notify a virtqueue after
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| 365 | * DRIVER_OK, this means the device should "see" the coherent
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| 366 | * memory write that set vq->broken as false which is done by
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| 367 | * the driver when it sees DRIVER_OK, then the following
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| 368 | * driver's vring_interrupt() will see vq->broken as false so
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| 369 | * we won't lose any notification.
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| 370 |
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| 371 | dev->config->set_status(dev, status | VIRTIO_CONFIG_S_DRIVER_OK);
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| 372 | }
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| 373 |
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| 374 | static inline
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| 375 | const char *virtio_bus_name(struct virtio_device *vdev)
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| 376 | {
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| 377 | if (!vdev->config->bus_name)
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| 378 | return "virtio";
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| 379 | return vdev->config->bus_name(vdev);
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| 380 | }
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| 381 |
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| 382 | |
| 383 | * virtqueue_set_affinity - setting affinity for a virtqueue
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| 384 | * @vq: the virtqueue
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| 385 | * @cpu_mask: the cpu mask
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| 386 | *
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| 387 | * Note that this function is best-effort: the affinity hint may not be set
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| 388 | * due to config support, irq type and sharing.
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| 389 | *
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| 390 |
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| 391 | static inline
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| 392 | int virtqueue_set_affinity(struct virtqueue *vq, const struct cpumask *cpu_mask)
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| 393 | {
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| 394 | struct virtio_device *vdev = vq->vdev;
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| 395 | if (vdev->config->set_vq_affinity)
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| 396 | return vdev->config->set_vq_affinity(vq, cpu_mask);
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| 397 | return 0;
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| 398 | }
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| 399 |
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| 400 | static inline
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| 401 | bool virtio_get_shm_region(struct virtio_device *vdev,
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| 402 | struct virtio_shm_region *region_out, u8 id)
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| 403 | {
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| 404 | if (!vdev->config->get_shm_region)
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| 405 | return false;
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| 406 | return vdev->config->get_shm_region(vdev, region_out, id);
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| 407 | }
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| 408 |
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| 409 | static inline bool virtio_is_little_endian(struct virtio_device *vdev)
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| 410 | {
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| 411 | return virtio_has_feature(vdev, VIRTIO_F_VERSION_1) ||
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| 412 | virtio_legacy_is_little_endian();
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| 413 | }
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| 414 |
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| 415 |
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| 416 | static inline u16 virtio16_to_cpu(struct virtio_device *vdev, __virtio16 val)
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| 417 | {
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| 418 | return __virtio16_to_cpu(virtio_is_little_endian(vdev), val);
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| 419 | }
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| 420 |
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| 421 | static inline __virtio16 cpu_to_virtio16(struct virtio_device *vdev, u16 val)
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| 422 | {
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| 423 | return __cpu_to_virtio16(virtio_is_little_endian(vdev), val);
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| 424 | }
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| 425 |
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| 426 | static inline u32 virtio32_to_cpu(struct virtio_device *vdev, __virtio32 val)
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| 427 | {
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| 428 | return __virtio32_to_cpu(virtio_is_little_endian(vdev), val);
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| 429 | }
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| 430 |
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| 431 | static inline __virtio32 cpu_to_virtio32(struct virtio_device *vdev, u32 val)
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| 432 | {
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| 433 | return __cpu_to_virtio32(virtio_is_little_endian(vdev), val);
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| 434 | }
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| 435 |
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| 436 | static inline u64 virtio64_to_cpu(struct virtio_device *vdev, __virtio64 val)
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| 437 | {
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| 438 | return __virtio64_to_cpu(virtio_is_little_endian(vdev), val);
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| 439 | }
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| 440 |
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| 441 | static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val)
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| 442 | {
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| 443 | return __cpu_to_virtio64(virtio_is_little_endian(vdev), val);
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| 444 | }
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| 445 |
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| 446 | #define virtio_to_cpu(vdev, x) \
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| 447 | _Generic((x), \
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| 448 | __u8: (x), \
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| 449 | __virtio16: virtio16_to_cpu((vdev), (x)), \
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| 450 | __virtio32: virtio32_to_cpu((vdev), (x)), \
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| 451 | __virtio64: virtio64_to_cpu((vdev), (x)) \
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| 452 | )
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| 453 |
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| 454 | #define cpu_to_virtio(vdev, x, m) \
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| 455 | _Generic((m), \
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| 456 | __u8: (x), \
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| 457 | __virtio16: cpu_to_virtio16((vdev), (x)), \
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| 458 | __virtio32: cpu_to_virtio32((vdev), (x)), \
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| 459 | __virtio64: cpu_to_virtio64((vdev), (x)) \
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| 460 | )
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| 461 |
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| 462 | #define __virtio_native_type(structname, member) \
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| 463 | typeof(virtio_to_cpu(NULL, ((structname*)0)->member))
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| 464 |
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| 465 |
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| 466 | #define virtio_cread(vdev, structname, member, ptr) \
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| 467 | do { \
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| 468 | typeof(((structname*)0)->member) virtio_cread_v; \
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| 469 | \
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| 470 | might_sleep(); \
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| 471 | \
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| 472 | typecheck(typeof(virtio_to_cpu((vdev), virtio_cread_v)), *(ptr)); \
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| 473 | \
|
| 474 | switch (sizeof(virtio_cread_v)) { \
|
| 475 | case 1: \
|
| 476 | case 2: \
|
| 477 | case 4: \
|
| 478 | vdev->config->get((vdev), \
|
| 479 | offsetof(structname, member), \
|
| 480 | &virtio_cread_v, \
|
| 481 | sizeof(virtio_cread_v)); \
|
| 482 | break; \
|
| 483 | default: \
|
| 484 | __virtio_cread_many((vdev), \
|
| 485 | offsetof(structname, member), \
|
| 486 | &virtio_cread_v, \
|
| 487 | 1, \
|
| 488 | sizeof(virtio_cread_v)); \
|
| 489 | break; \
|
| 490 | } \
|
| 491 | *(ptr) = virtio_to_cpu(vdev, virtio_cread_v); \
|
| 492 | } while(0)
|
| 493 |
|
| 494 |
|
| 495 | #define virtio_cwrite(vdev, structname, member, ptr) \
|
| 496 | do { \
|
| 497 | typeof(((structname*)0)->member) virtio_cwrite_v = \
|
| 498 | cpu_to_virtio(vdev, *(ptr), ((structname*)0)->member); \
|
| 499 | \
|
| 500 | might_sleep(); \
|
| 501 | \
|
| 502 | typecheck(typeof(virtio_to_cpu((vdev), virtio_cwrite_v)), *(ptr)); \
|
| 503 | \
|
| 504 | vdev->config->set((vdev), offsetof(structname, member), \
|
| 505 | &virtio_cwrite_v, \
|
| 506 | sizeof(virtio_cwrite_v)); \
|
| 507 | } while(0)
|
| 508 |
|
| 509 | |
| 510 | * Nothing virtio-specific about these, but let's worry about generalizing
|
| 511 | * these later.
|
| 512 |
|
| 513 | #define virtio_le_to_cpu(x) \
|
| 514 | _Generic((x), \
|
| 515 | __u8: (u8)(x), \
|
| 516 | __le16: (u16)le16_to_cpu(x), \
|
| 517 | __le32: (u32)le32_to_cpu(x), \
|
| 518 | __le64: (u64)le64_to_cpu(x) \
|
| 519 | )
|
| 520 |
|
| 521 | #define virtio_cpu_to_le(x, m) \
|
| 522 | _Generic((m), \
|
| 523 | __u8: (x), \
|
| 524 | __le16: cpu_to_le16(x), \
|
| 525 | __le32: cpu_to_le32(x), \
|
| 526 | __le64: cpu_to_le64(x) \
|
| 527 | )
|
| 528 |
|
| 529 |
|
| 530 | #define virtio_cread_le(vdev, structname, member, ptr) \
|
| 531 | do { \
|
| 532 | typeof(((structname*)0)->member) virtio_cread_v; \
|
| 533 | \
|
| 534 | might_sleep(); \
|
| 535 | \
|
| 536 | typecheck(typeof(virtio_le_to_cpu(virtio_cread_v)), *(ptr)); \
|
| 537 | \
|
| 538 | switch (sizeof(virtio_cread_v)) { \
|
| 539 | case 1: \
|
| 540 | case 2: \
|
| 541 | case 4: \
|
| 542 | vdev->config->get((vdev), \
|
| 543 | offsetof(structname, member), \
|
| 544 | &virtio_cread_v, \
|
| 545 | sizeof(virtio_cread_v)); \
|
| 546 | break; \
|
| 547 | default: \
|
| 548 | __virtio_cread_many((vdev), \
|
| 549 | offsetof(structname, member), \
|
| 550 | &virtio_cread_v, \
|
| 551 | 1, \
|
| 552 | sizeof(virtio_cread_v)); \
|
| 553 | break; \
|
| 554 | } \
|
| 555 | *(ptr) = virtio_le_to_cpu(virtio_cread_v); \
|
| 556 | } while(0)
|
| 557 |
|
| 558 | #define virtio_cwrite_le(vdev, structname, member, ptr) \
|
| 559 | do { \
|
| 560 | typeof(((structname*)0)->member) virtio_cwrite_v = \
|
| 561 | virtio_cpu_to_le(*(ptr), ((structname*)0)->member); \
|
| 562 | \
|
| 563 | might_sleep(); \
|
| 564 | \
|
| 565 | typecheck(typeof(virtio_le_to_cpu(virtio_cwrite_v)), *(ptr)); \
|
| 566 | \
|
| 567 | vdev->config->set((vdev), offsetof(structname, member), \
|
| 568 | &virtio_cwrite_v, \
|
| 569 | sizeof(virtio_cwrite_v)); \
|
| 570 | } while(0)
|
| 571 |
|
| 572 |
|
| 573 |
|
| 574 | static inline void __virtio_cread_many(struct virtio_device *vdev,
|
| 575 | unsigned int offset,
|
| 576 | void *buf, size_t count, size_t bytes)
|
| 577 | {
|
| 578 | u32 old, gen = vdev->config->generation ?
|
| 579 | vdev->config->generation(vdev) : 0;
|
| 580 | int i;
|
| 581 |
|
| 582 | might_sleep();
|
| 583 | do {
|
| 584 | old = gen;
|
| 585 |
|
| 586 | for (i = 0; i < count; i++)
|
| 587 | vdev->config->get(vdev, offset + bytes * i,
|
| 588 | buf + i * bytes, bytes);
|
| 589 |
|
| 590 | gen = vdev->config->generation ?
|
| 591 | vdev->config->generation(vdev) : 0;
|
| 592 | } while (gen != old);
|
| 593 | }
|
| 594 |
|
| 595 | static inline void virtio_cread_bytes(struct virtio_device *vdev,
|
| 596 | unsigned int offset,
|
| 597 | void *buf, size_t len)
|
| 598 | {
|
| 599 | __virtio_cread_many(vdev, offset, buf, len, 1);
|
| 600 | }
|
| 601 |
|
| 602 | static inline u8 virtio_cread8(struct virtio_device *vdev, unsigned int offset)
|
| 603 | {
|
| 604 | u8 ret;
|
| 605 |
|
| 606 | might_sleep();
|
| 607 | vdev->config->get(vdev, offset, &ret, sizeof(ret));
|
| 608 | return ret;
|
| 609 | }
|
| 610 |
|
| 611 | static inline void virtio_cwrite8(struct virtio_device *vdev,
|
| 612 | unsigned int offset, u8 val)
|
| 613 | {
|
| 614 | might_sleep();
|
| 615 | vdev->config->set(vdev, offset, &val, sizeof(val));
|
| 616 | }
|
| 617 |
|
| 618 | static inline u16 virtio_cread16(struct virtio_device *vdev,
|
| 619 | unsigned int offset)
|
| 620 | {
|
| 621 | __virtio16 ret;
|
| 622 |
|
| 623 | might_sleep();
|
| 624 | vdev->config->get(vdev, offset, &ret, sizeof(ret));
|
| 625 | return virtio16_to_cpu(vdev, ret);
|
| 626 | }
|
| 627 |
|
| 628 | static inline void virtio_cwrite16(struct virtio_device *vdev,
|
| 629 | unsigned int offset, u16 val)
|
| 630 | {
|
| 631 | __virtio16 v;
|
| 632 |
|
| 633 | might_sleep();
|
| 634 | v = cpu_to_virtio16(vdev, val);
|
| 635 | vdev->config->set(vdev, offset, &v, sizeof(v));
|
| 636 | }
|
| 637 |
|
| 638 | static inline u32 virtio_cread32(struct virtio_device *vdev,
|
| 639 | unsigned int offset)
|
| 640 | {
|
| 641 | __virtio32 ret;
|
| 642 |
|
| 643 | might_sleep();
|
| 644 | vdev->config->get(vdev, offset, &ret, sizeof(ret));
|
| 645 | return virtio32_to_cpu(vdev, ret);
|
| 646 | }
|
| 647 |
|
| 648 | static inline void virtio_cwrite32(struct virtio_device *vdev,
|
| 649 | unsigned int offset, u32 val)
|
| 650 | {
|
| 651 | __virtio32 v;
|
| 652 |
|
| 653 | might_sleep();
|
| 654 | v = cpu_to_virtio32(vdev, val);
|
| 655 | vdev->config->set(vdev, offset, &v, sizeof(v));
|
| 656 | }
|
| 657 |
|
| 658 | static inline u64 virtio_cread64(struct virtio_device *vdev,
|
| 659 | unsigned int offset)
|
| 660 | {
|
| 661 | __virtio64 ret;
|
| 662 |
|
| 663 | __virtio_cread_many(vdev, offset, &ret, 1, sizeof(ret));
|
| 664 | return virtio64_to_cpu(vdev, ret);
|
| 665 | }
|
| 666 |
|
| 667 | static inline void virtio_cwrite64(struct virtio_device *vdev,
|
| 668 | unsigned int offset, u64 val)
|
| 669 | {
|
| 670 | __virtio64 v;
|
| 671 |
|
| 672 | might_sleep();
|
| 673 | v = cpu_to_virtio64(vdev, val);
|
| 674 | vdev->config->set(vdev, offset, &v, sizeof(v));
|
| 675 | }
|
| 676 |
|
| 677 |
|
| 678 | #define virtio_cread_feature(vdev, fbit, structname, member, ptr) \
|
| 679 | ({ \
|
| 680 | int _r = 0; \
|
| 681 | if (!virtio_has_feature(vdev, fbit)) \
|
| 682 | _r = -ENOENT; \
|
| 683 | else \
|
| 684 | virtio_cread((vdev), structname, member, ptr); \
|
| 685 | _r; \
|
| 686 | })
|
| 687 |
|
| 688 |
|
| 689 | #define virtio_cread_le_feature(vdev, fbit, structname, member, ptr) \
|
| 690 | ({ \
|
| 691 | int _r = 0; \
|
| 692 | if (!virtio_has_feature(vdev, fbit)) \
|
| 693 | _r = -ENOENT; \
|
| 694 | else \
|
| 695 | virtio_cread_le((vdev), structname, member, ptr); \
|
| 696 | _r; \
|
| 697 | })
|
| 698 |
|
| 699 | #endif
|