626 lines
18 KiB
C
626 lines
18 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_VIRTIO_CONFIG_H
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#define _LINUX_VIRTIO_CONFIG_H
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#include <linux/err.h>
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#include <linux/bug.h>
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#include <linux/virtio.h>
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#include <linux/virtio_byteorder.h>
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#include <linux/compiler_types.h>
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#include <uapi/linux/virtio_config.h>
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struct irq_affinity;
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struct virtio_shm_region {
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u64 addr;
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u64 len;
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};
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typedef void vq_callback_t(struct virtqueue *);
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/**
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* struct virtio_config_ops - operations for configuring a virtio device
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* Note: Do not assume that a transport implements all of the operations
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* getting/setting a value as a simple read/write! Generally speaking,
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* any of @get/@set, @get_status/@set_status, or @get_features/
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* @finalize_features are NOT safe to be called from an atomic
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* context.
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* @get: read the value of a configuration field
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* vdev: the virtio_device
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* offset: the offset of the configuration field
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* buf: the buffer to write the field value into.
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* len: the length of the buffer
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* @set: write the value of a configuration field
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* vdev: the virtio_device
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* offset: the offset of the configuration field
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* buf: the buffer to read the field value from.
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* len: the length of the buffer
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* @generation: config generation counter (optional)
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* vdev: the virtio_device
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* Returns the config generation counter
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* @get_status: read the status byte
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* vdev: the virtio_device
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* Returns the status byte
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* @set_status: write the status byte
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* vdev: the virtio_device
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* status: the new status byte
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* @reset: reset the device
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* vdev: the virtio device
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* After this, status and feature negotiation must be done again
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* Device must not be reset from its vq/config callbacks, or in
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* parallel with being added/removed.
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* @find_vqs: find virtqueues and instantiate them.
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* vdev: the virtio_device
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* nvqs: the number of virtqueues to find
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* vqs: on success, includes new virtqueues
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* callbacks: array of callbacks, for each virtqueue
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* include a NULL entry for vqs that do not need a callback
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* names: array of virtqueue names (mainly for debugging)
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* include a NULL entry for vqs unused by driver
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* Returns 0 on success or error status
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* @del_vqs: free virtqueues found by find_vqs().
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* @synchronize_cbs: synchronize with the virtqueue callbacks (optional)
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* The function guarantees that all memory operations on the
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* queue before it are visible to the vring_interrupt() that is
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* called after it.
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* vdev: the virtio_device
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* @get_features: get the array of feature bits for this device.
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* vdev: the virtio_device
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* Returns the first 64 feature bits (all we currently need).
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* @finalize_features: confirm what device features we'll be using.
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* vdev: the virtio_device
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* This sends the driver feature bits to the device: it can change
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* the dev->feature bits if it wants.
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* Note that despite the name this can be called any number of
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* times.
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* Returns 0 on success or error status
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* @bus_name: return the bus name associated with the device (optional)
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* vdev: the virtio_device
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* This returns a pointer to the bus name a la pci_name from which
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* the caller can then copy.
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* @set_vq_affinity: set the affinity for a virtqueue (optional).
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* @get_vq_affinity: get the affinity for a virtqueue (optional).
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* @get_shm_region: get a shared memory region based on the index.
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* @disable_vq_and_reset: reset a queue individually (optional).
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* vq: the virtqueue
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* Returns 0 on success or error status
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* disable_vq_and_reset will guarantee that the callbacks are disabled and
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* synchronized.
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* Except for the callback, the caller should guarantee that the vring is
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* not accessed by any functions of virtqueue.
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* @enable_vq_after_reset: enable a reset queue
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* vq: the virtqueue
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* Returns 0 on success or error status
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* If disable_vq_and_reset is set, then enable_vq_after_reset must also be
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* set.
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*/
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struct virtio_config_ops {
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void (*get)(struct virtio_device *vdev, unsigned offset,
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void *buf, unsigned len);
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void (*set)(struct virtio_device *vdev, unsigned offset,
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const void *buf, unsigned len);
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u32 (*generation)(struct virtio_device *vdev);
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u8 (*get_status)(struct virtio_device *vdev);
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void (*set_status)(struct virtio_device *vdev, u8 status);
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void (*reset)(struct virtio_device *vdev);
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int (*find_vqs)(struct virtio_device *, unsigned nvqs,
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struct virtqueue *vqs[], vq_callback_t *callbacks[],
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const char * const names[], const bool *ctx,
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struct irq_affinity *desc);
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void (*del_vqs)(struct virtio_device *);
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void (*synchronize_cbs)(struct virtio_device *);
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u64 (*get_features)(struct virtio_device *vdev);
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int (*finalize_features)(struct virtio_device *vdev);
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const char *(*bus_name)(struct virtio_device *vdev);
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int (*set_vq_affinity)(struct virtqueue *vq,
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const struct cpumask *cpu_mask);
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const struct cpumask *(*get_vq_affinity)(struct virtio_device *vdev,
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int index);
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bool (*get_shm_region)(struct virtio_device *vdev,
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struct virtio_shm_region *region, u8 id);
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int (*disable_vq_and_reset)(struct virtqueue *vq);
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int (*enable_vq_after_reset)(struct virtqueue *vq);
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};
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/* If driver didn't advertise the feature, it will never appear. */
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void virtio_check_driver_offered_feature(const struct virtio_device *vdev,
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unsigned int fbit);
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/**
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* __virtio_test_bit - helper to test feature bits. For use by transports.
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* Devices should normally use virtio_has_feature,
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* which includes more checks.
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* @vdev: the device
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* @fbit: the feature bit
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*/
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static inline bool __virtio_test_bit(const struct virtio_device *vdev,
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unsigned int fbit)
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{
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/* Did you forget to fix assumptions on max features? */
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if (__builtin_constant_p(fbit))
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BUILD_BUG_ON(fbit >= 64);
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else
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BUG_ON(fbit >= 64);
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return vdev->features & BIT_ULL(fbit);
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}
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/**
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* __virtio_set_bit - helper to set feature bits. For use by transports.
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* @vdev: the device
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* @fbit: the feature bit
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*/
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static inline void __virtio_set_bit(struct virtio_device *vdev,
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unsigned int fbit)
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{
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/* Did you forget to fix assumptions on max features? */
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if (__builtin_constant_p(fbit))
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BUILD_BUG_ON(fbit >= 64);
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else
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BUG_ON(fbit >= 64);
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vdev->features |= BIT_ULL(fbit);
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}
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/**
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* __virtio_clear_bit - helper to clear feature bits. For use by transports.
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* @vdev: the device
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* @fbit: the feature bit
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*/
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static inline void __virtio_clear_bit(struct virtio_device *vdev,
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unsigned int fbit)
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{
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/* Did you forget to fix assumptions on max features? */
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if (__builtin_constant_p(fbit))
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BUILD_BUG_ON(fbit >= 64);
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else
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BUG_ON(fbit >= 64);
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vdev->features &= ~BIT_ULL(fbit);
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}
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/**
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* virtio_has_feature - helper to determine if this device has this feature.
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* @vdev: the device
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* @fbit: the feature bit
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*/
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static inline bool virtio_has_feature(const struct virtio_device *vdev,
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unsigned int fbit)
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{
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if (fbit < VIRTIO_TRANSPORT_F_START)
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virtio_check_driver_offered_feature(vdev, fbit);
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return __virtio_test_bit(vdev, fbit);
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}
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/**
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* virtio_has_dma_quirk - determine whether this device has the DMA quirk
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* @vdev: the device
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*/
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static inline bool virtio_has_dma_quirk(const struct virtio_device *vdev)
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{
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/*
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* Note the reverse polarity of the quirk feature (compared to most
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* other features), this is for compatibility with legacy systems.
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*/
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return !virtio_has_feature(vdev, VIRTIO_F_ACCESS_PLATFORM);
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}
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static inline
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struct virtqueue *virtio_find_single_vq(struct virtio_device *vdev,
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vq_callback_t *c, const char *n)
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{
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vq_callback_t *callbacks[] = { c };
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const char *names[] = { n };
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struct virtqueue *vq;
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int err = vdev->config->find_vqs(vdev, 1, &vq, callbacks, names, NULL,
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NULL);
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if (err < 0)
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return ERR_PTR(err);
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return vq;
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}
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static inline
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int virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs,
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struct virtqueue *vqs[], vq_callback_t *callbacks[],
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const char * const names[],
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struct irq_affinity *desc)
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{
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return vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names, NULL, desc);
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}
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static inline
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int virtio_find_vqs_ctx(struct virtio_device *vdev, unsigned nvqs,
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struct virtqueue *vqs[], vq_callback_t *callbacks[],
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const char * const names[], const bool *ctx,
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struct irq_affinity *desc)
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{
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return vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names, ctx,
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desc);
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}
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/**
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* virtio_synchronize_cbs - synchronize with virtqueue callbacks
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* @dev: the virtio device
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*/
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static inline
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void virtio_synchronize_cbs(struct virtio_device *dev)
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{
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if (dev->config->synchronize_cbs) {
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dev->config->synchronize_cbs(dev);
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} else {
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/*
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* A best effort fallback to synchronize with
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* interrupts, preemption and softirq disabled
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* regions. See comment above synchronize_rcu().
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*/
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synchronize_rcu();
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}
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}
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/**
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* virtio_device_ready - enable vq use in probe function
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* @dev: the virtio device
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*
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* Driver must call this to use vqs in the probe function.
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*
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* Note: vqs are enabled automatically after probe returns.
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*/
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static inline
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void virtio_device_ready(struct virtio_device *dev)
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{
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unsigned status = dev->config->get_status(dev);
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WARN_ON(status & VIRTIO_CONFIG_S_DRIVER_OK);
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#ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION
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/*
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* The virtio_synchronize_cbs() makes sure vring_interrupt()
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* will see the driver specific setup if it sees vq->broken
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* as false (even if the notifications come before DRIVER_OK).
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*/
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virtio_synchronize_cbs(dev);
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__virtio_unbreak_device(dev);
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#endif
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/*
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* The transport should ensure the visibility of vq->broken
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* before setting DRIVER_OK. See the comments for the transport
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* specific set_status() method.
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*
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* A well behaved device will only notify a virtqueue after
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* DRIVER_OK, this means the device should "see" the coherenct
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* memory write that set vq->broken as false which is done by
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* the driver when it sees DRIVER_OK, then the following
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* driver's vring_interrupt() will see vq->broken as false so
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* we won't lose any notification.
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*/
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dev->config->set_status(dev, status | VIRTIO_CONFIG_S_DRIVER_OK);
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}
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static inline
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const char *virtio_bus_name(struct virtio_device *vdev)
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{
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if (!vdev->config->bus_name)
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return "virtio";
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return vdev->config->bus_name(vdev);
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}
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/**
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* virtqueue_set_affinity - setting affinity for a virtqueue
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* @vq: the virtqueue
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* @cpu_mask: the cpu mask
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*
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* Pay attention the function are best-effort: the affinity hint may not be set
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* due to config support, irq type and sharing.
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*
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*/
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static inline
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int virtqueue_set_affinity(struct virtqueue *vq, const struct cpumask *cpu_mask)
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{
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struct virtio_device *vdev = vq->vdev;
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if (vdev->config->set_vq_affinity)
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return vdev->config->set_vq_affinity(vq, cpu_mask);
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return 0;
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}
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static inline
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bool virtio_get_shm_region(struct virtio_device *vdev,
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struct virtio_shm_region *region, u8 id)
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{
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if (!vdev->config->get_shm_region)
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return false;
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return vdev->config->get_shm_region(vdev, region, id);
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}
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static inline bool virtio_is_little_endian(struct virtio_device *vdev)
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{
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return virtio_has_feature(vdev, VIRTIO_F_VERSION_1) ||
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virtio_legacy_is_little_endian();
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}
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/* Memory accessors */
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static inline u16 virtio16_to_cpu(struct virtio_device *vdev, __virtio16 val)
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{
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return __virtio16_to_cpu(virtio_is_little_endian(vdev), val);
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}
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static inline __virtio16 cpu_to_virtio16(struct virtio_device *vdev, u16 val)
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{
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return __cpu_to_virtio16(virtio_is_little_endian(vdev), val);
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}
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static inline u32 virtio32_to_cpu(struct virtio_device *vdev, __virtio32 val)
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{
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return __virtio32_to_cpu(virtio_is_little_endian(vdev), val);
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}
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static inline __virtio32 cpu_to_virtio32(struct virtio_device *vdev, u32 val)
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{
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return __cpu_to_virtio32(virtio_is_little_endian(vdev), val);
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}
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static inline u64 virtio64_to_cpu(struct virtio_device *vdev, __virtio64 val)
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{
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return __virtio64_to_cpu(virtio_is_little_endian(vdev), val);
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}
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static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val)
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{
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return __cpu_to_virtio64(virtio_is_little_endian(vdev), val);
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}
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#define virtio_to_cpu(vdev, x) \
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_Generic((x), \
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__u8: (x), \
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__virtio16: virtio16_to_cpu((vdev), (x)), \
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__virtio32: virtio32_to_cpu((vdev), (x)), \
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__virtio64: virtio64_to_cpu((vdev), (x)) \
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)
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#define cpu_to_virtio(vdev, x, m) \
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_Generic((m), \
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__u8: (x), \
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__virtio16: cpu_to_virtio16((vdev), (x)), \
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__virtio32: cpu_to_virtio32((vdev), (x)), \
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__virtio64: cpu_to_virtio64((vdev), (x)) \
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)
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#define __virtio_native_type(structname, member) \
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typeof(virtio_to_cpu(NULL, ((structname*)0)->member))
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/* Config space accessors. */
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#define virtio_cread(vdev, structname, member, ptr) \
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do { \
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typeof(((structname*)0)->member) virtio_cread_v; \
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\
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might_sleep(); \
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/* Sanity check: must match the member's type */ \
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typecheck(typeof(virtio_to_cpu((vdev), virtio_cread_v)), *(ptr)); \
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\
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switch (sizeof(virtio_cread_v)) { \
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case 1: \
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case 2: \
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case 4: \
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vdev->config->get((vdev), \
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offsetof(structname, member), \
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&virtio_cread_v, \
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sizeof(virtio_cread_v)); \
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break; \
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default: \
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__virtio_cread_many((vdev), \
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offsetof(structname, member), \
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&virtio_cread_v, \
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1, \
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sizeof(virtio_cread_v)); \
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break; \
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} \
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*(ptr) = virtio_to_cpu(vdev, virtio_cread_v); \
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} while(0)
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/* Config space accessors. */
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#define virtio_cwrite(vdev, structname, member, ptr) \
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do { \
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typeof(((structname*)0)->member) virtio_cwrite_v = \
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cpu_to_virtio(vdev, *(ptr), ((structname*)0)->member); \
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\
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might_sleep(); \
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/* Sanity check: must match the member's type */ \
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typecheck(typeof(virtio_to_cpu((vdev), virtio_cwrite_v)), *(ptr)); \
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\
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vdev->config->set((vdev), offsetof(structname, member), \
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&virtio_cwrite_v, \
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sizeof(virtio_cwrite_v)); \
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} while(0)
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/*
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* Nothing virtio-specific about these, but let's worry about generalizing
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* these later.
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*/
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#define virtio_le_to_cpu(x) \
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_Generic((x), \
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__u8: (u8)(x), \
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__le16: (u16)le16_to_cpu(x), \
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__le32: (u32)le32_to_cpu(x), \
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__le64: (u64)le64_to_cpu(x) \
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)
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#define virtio_cpu_to_le(x, m) \
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_Generic((m), \
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__u8: (x), \
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__le16: cpu_to_le16(x), \
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__le32: cpu_to_le32(x), \
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__le64: cpu_to_le64(x) \
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)
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/* LE (e.g. modern) Config space accessors. */
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#define virtio_cread_le(vdev, structname, member, ptr) \
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do { \
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typeof(((structname*)0)->member) virtio_cread_v; \
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\
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might_sleep(); \
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/* Sanity check: must match the member's type */ \
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typecheck(typeof(virtio_le_to_cpu(virtio_cread_v)), *(ptr)); \
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\
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switch (sizeof(virtio_cread_v)) { \
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case 1: \
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case 2: \
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case 4: \
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vdev->config->get((vdev), \
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offsetof(structname, member), \
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&virtio_cread_v, \
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sizeof(virtio_cread_v)); \
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break; \
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default: \
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__virtio_cread_many((vdev), \
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offsetof(structname, member), \
|
|
&virtio_cread_v, \
|
|
1, \
|
|
sizeof(virtio_cread_v)); \
|
|
break; \
|
|
} \
|
|
*(ptr) = virtio_le_to_cpu(virtio_cread_v); \
|
|
} while(0)
|
|
|
|
#define virtio_cwrite_le(vdev, structname, member, ptr) \
|
|
do { \
|
|
typeof(((structname*)0)->member) virtio_cwrite_v = \
|
|
virtio_cpu_to_le(*(ptr), ((structname*)0)->member); \
|
|
\
|
|
might_sleep(); \
|
|
/* Sanity check: must match the member's type */ \
|
|
typecheck(typeof(virtio_le_to_cpu(virtio_cwrite_v)), *(ptr)); \
|
|
\
|
|
vdev->config->set((vdev), offsetof(structname, member), \
|
|
&virtio_cwrite_v, \
|
|
sizeof(virtio_cwrite_v)); \
|
|
} while(0)
|
|
|
|
|
|
/* Read @count fields, @bytes each. */
|
|
static inline void __virtio_cread_many(struct virtio_device *vdev,
|
|
unsigned int offset,
|
|
void *buf, size_t count, size_t bytes)
|
|
{
|
|
u32 old, gen = vdev->config->generation ?
|
|
vdev->config->generation(vdev) : 0;
|
|
int i;
|
|
|
|
might_sleep();
|
|
do {
|
|
old = gen;
|
|
|
|
for (i = 0; i < count; i++)
|
|
vdev->config->get(vdev, offset + bytes * i,
|
|
buf + i * bytes, bytes);
|
|
|
|
gen = vdev->config->generation ?
|
|
vdev->config->generation(vdev) : 0;
|
|
} while (gen != old);
|
|
}
|
|
|
|
static inline void virtio_cread_bytes(struct virtio_device *vdev,
|
|
unsigned int offset,
|
|
void *buf, size_t len)
|
|
{
|
|
__virtio_cread_many(vdev, offset, buf, len, 1);
|
|
}
|
|
|
|
static inline u8 virtio_cread8(struct virtio_device *vdev, unsigned int offset)
|
|
{
|
|
u8 ret;
|
|
|
|
might_sleep();
|
|
vdev->config->get(vdev, offset, &ret, sizeof(ret));
|
|
return ret;
|
|
}
|
|
|
|
static inline void virtio_cwrite8(struct virtio_device *vdev,
|
|
unsigned int offset, u8 val)
|
|
{
|
|
might_sleep();
|
|
vdev->config->set(vdev, offset, &val, sizeof(val));
|
|
}
|
|
|
|
static inline u16 virtio_cread16(struct virtio_device *vdev,
|
|
unsigned int offset)
|
|
{
|
|
__virtio16 ret;
|
|
|
|
might_sleep();
|
|
vdev->config->get(vdev, offset, &ret, sizeof(ret));
|
|
return virtio16_to_cpu(vdev, ret);
|
|
}
|
|
|
|
static inline void virtio_cwrite16(struct virtio_device *vdev,
|
|
unsigned int offset, u16 val)
|
|
{
|
|
__virtio16 v;
|
|
|
|
might_sleep();
|
|
v = cpu_to_virtio16(vdev, val);
|
|
vdev->config->set(vdev, offset, &v, sizeof(v));
|
|
}
|
|
|
|
static inline u32 virtio_cread32(struct virtio_device *vdev,
|
|
unsigned int offset)
|
|
{
|
|
__virtio32 ret;
|
|
|
|
might_sleep();
|
|
vdev->config->get(vdev, offset, &ret, sizeof(ret));
|
|
return virtio32_to_cpu(vdev, ret);
|
|
}
|
|
|
|
static inline void virtio_cwrite32(struct virtio_device *vdev,
|
|
unsigned int offset, u32 val)
|
|
{
|
|
__virtio32 v;
|
|
|
|
might_sleep();
|
|
v = cpu_to_virtio32(vdev, val);
|
|
vdev->config->set(vdev, offset, &v, sizeof(v));
|
|
}
|
|
|
|
static inline u64 virtio_cread64(struct virtio_device *vdev,
|
|
unsigned int offset)
|
|
{
|
|
__virtio64 ret;
|
|
|
|
__virtio_cread_many(vdev, offset, &ret, 1, sizeof(ret));
|
|
return virtio64_to_cpu(vdev, ret);
|
|
}
|
|
|
|
static inline void virtio_cwrite64(struct virtio_device *vdev,
|
|
unsigned int offset, u64 val)
|
|
{
|
|
__virtio64 v;
|
|
|
|
might_sleep();
|
|
v = cpu_to_virtio64(vdev, val);
|
|
vdev->config->set(vdev, offset, &v, sizeof(v));
|
|
}
|
|
|
|
/* Conditional config space accessors. */
|
|
#define virtio_cread_feature(vdev, fbit, structname, member, ptr) \
|
|
({ \
|
|
int _r = 0; \
|
|
if (!virtio_has_feature(vdev, fbit)) \
|
|
_r = -ENOENT; \
|
|
else \
|
|
virtio_cread((vdev), structname, member, ptr); \
|
|
_r; \
|
|
})
|
|
|
|
/* Conditional config space accessors. */
|
|
#define virtio_cread_le_feature(vdev, fbit, structname, member, ptr) \
|
|
({ \
|
|
int _r = 0; \
|
|
if (!virtio_has_feature(vdev, fbit)) \
|
|
_r = -ENOENT; \
|
|
else \
|
|
virtio_cread_le((vdev), structname, member, ptr); \
|
|
_r; \
|
|
})
|
|
|
|
#endif /* _LINUX_VIRTIO_CONFIG_H */
|