Release 4.12 include/linux/virtio_config.h
#ifndef _LINUX_VIRTIO_CONFIG_H
#define _LINUX_VIRTIO_CONFIG_H
#include <linux/err.h>
#include <linux/bug.h>
#include <linux/virtio.h>
#include <linux/virtio_byteorder.h>
#include <uapi/linux/virtio_config.h>
struct irq_affinity;
/**
* virtio_config_ops - operations for configuring a virtio device
* @get: read the value of a configuration field
* vdev: the virtio_device
* offset: the offset of the configuration field
* buf: the buffer to write the field value into.
* len: the length of the buffer
* @set: write the value of a configuration field
* vdev: the virtio_device
* offset: the offset of the configuration field
* buf: the buffer to read the field value from.
* len: the length of the buffer
* @generation: config generation counter
* vdev: the virtio_device
* Returns the config generation counter
* @get_status: read the status byte
* vdev: the virtio_device
* Returns the status byte
* @set_status: write the status byte
* vdev: the virtio_device
* status: the new status byte
* @reset: reset the device
* vdev: the virtio device
* After this, status and feature negotiation must be done again
* Device must not be reset from its vq/config callbacks, or in
* parallel with being added/removed.
* @find_vqs: find virtqueues and instantiate them.
* vdev: the virtio_device
* nvqs: the number of virtqueues to find
* vqs: on success, includes new virtqueues
* callbacks: array of callbacks, for each virtqueue
* include a NULL entry for vqs that do not need a callback
* names: array of virtqueue names (mainly for debugging)
* include a NULL entry for vqs unused by driver
* Returns 0 on success or error status
* @del_vqs: free virtqueues found by find_vqs().
* @get_features: get the array of feature bits for this device.
* vdev: the virtio_device
* Returns the first 32 feature bits (all we currently need).
* @finalize_features: confirm what device features we'll be using.
* vdev: the virtio_device
* This gives the final feature bits for the device: it can change
* the dev->feature bits if it wants.
* Returns 0 on success or error status
* @bus_name: return the bus name associated with the device
* vdev: the virtio_device
* This returns a pointer to the bus name a la pci_name from which
* the caller can then copy.
* @set_vq_affinity: set the affinity for a virtqueue.
* @get_vq_affinity: get the affinity for a virtqueue (optional).
*/
typedef void vq_callback_t(struct virtqueue *);
struct virtio_config_ops {
void (*get)(struct virtio_device *vdev, unsigned offset,
void *buf, unsigned len);
void (*set)(struct virtio_device *vdev, unsigned offset,
const void *buf, unsigned len);
u32 (*generation)(struct virtio_device *vdev);
u8 (*get_status)(struct virtio_device *vdev);
void (*set_status)(struct virtio_device *vdev, u8 status);
void (*reset)(struct virtio_device *vdev);
int (*find_vqs)(struct virtio_device *, unsigned nvqs,
struct virtqueue *vqs[], vq_callback_t *callbacks[],
const char * const names[], const bool *ctx,
struct irq_affinity *desc);
void (*del_vqs)(struct virtio_device *);
u64 (*get_features)(struct virtio_device *vdev);
int (*finalize_features)(struct virtio_device *vdev);
const char *(*bus_name)(struct virtio_device *vdev);
int (*set_vq_affinity)(struct virtqueue *vq, int cpu);
const struct cpumask *(*get_vq_affinity)(struct virtio_device *vdev,
int index);
};
/* If driver didn't advertise the feature, it will never appear. */
void virtio_check_driver_offered_feature(const struct virtio_device *vdev,
unsigned int fbit);
/**
* __virtio_test_bit - helper to test feature bits. For use by transports.
* Devices should normally use virtio_has_feature,
* which includes more checks.
* @vdev: the device
* @fbit: the feature bit
*/
static inline bool __virtio_test_bit(const struct virtio_device *vdev,
unsigned int fbit)
{
/* Did you forget to fix assumptions on max features? */
if (__builtin_constant_p(fbit))
BUILD_BUG_ON(fbit >= 64);
else
BUG_ON(fbit >= 64);
return vdev->features & BIT_ULL(fbit);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Rusty Russell | 36 | 72.00% | 2 | 40.00% |
| Michael S. Tsirkin | 14 | 28.00% | 3 | 60.00% |
| Total | 50 | 100.00% | 5 | 100.00% |
/**
* __virtio_set_bit - helper to set feature bits. For use by transports.
* @vdev: the device
* @fbit: the feature bit
*/
static inline void __virtio_set_bit(struct virtio_device *vdev,
unsigned int fbit)
{
/* Did you forget to fix assumptions on max features? */
if (__builtin_constant_p(fbit))
BUILD_BUG_ON(fbit >= 64);
else
BUG_ON(fbit >= 64);
vdev->features |= BIT_ULL(fbit);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael S. Tsirkin | 48 | 100.00% | 3 | 100.00% |
| Total | 48 | 100.00% | 3 | 100.00% |
/**
* __virtio_clear_bit - helper to clear feature bits. For use by transports.
* @vdev: the device
* @fbit: the feature bit
*/
static inline void __virtio_clear_bit(struct virtio_device *vdev,
unsigned int fbit)
{
/* Did you forget to fix assumptions on max features? */
if (__builtin_constant_p(fbit))
BUILD_BUG_ON(fbit >= 64);
else
BUG_ON(fbit >= 64);
vdev->features &= ~BIT_ULL(fbit);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael S. Tsirkin | 49 | 100.00% | 3 | 100.00% |
| Total | 49 | 100.00% | 3 | 100.00% |
/**
* virtio_has_feature - helper to determine if this device has this feature.
* @vdev: the device
* @fbit: the feature bit
*/
static inline bool virtio_has_feature(const struct virtio_device *vdev,
unsigned int fbit)
{
if (fbit < VIRTIO_TRANSPORT_F_START)
virtio_check_driver_offered_feature(vdev, fbit);
return __virtio_test_bit(vdev, fbit);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael S. Tsirkin | 19 | 50.00% | 1 | 33.33% |
| Rusty Russell | 13 | 34.21% | 1 | 33.33% |
| Mark McLoughlin | 6 | 15.79% | 1 | 33.33% |
| Total | 38 | 100.00% | 3 | 100.00% |
/**
* virtio_has_iommu_quirk - determine whether this device has the iommu quirk
* @vdev: the device
*/
static inline bool virtio_has_iommu_quirk(const struct virtio_device *vdev)
{
/*
* Note the reverse polarity of the quirk feature (compared to most
* other features), this is for compatibility with legacy systems.
*/
return !virtio_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael S. Tsirkin | 23 | 100.00% | 1 | 100.00% |
| Total | 23 | 100.00% | 1 | 100.00% |
static inline
struct virtqueue *virtio_find_single_vq(struct virtio_device *vdev,
vq_callback_t *c, const char *n)
{
vq_callback_t *callbacks[] = { c };
const char *names[] = { n };
struct virtqueue *vq;
int err = vdev->config->find_vqs(vdev, 1, &vq, callbacks, names, NULL,
NULL);
if (err < 0)
return ERR_PTR(err);
return vq;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael S. Tsirkin | 85 | 97.70% | 2 | 66.67% |
| Christoph Hellwig | 2 | 2.30% | 1 | 33.33% |
| Total | 87 | 100.00% | 3 | 100.00% |
static inline
int virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[], vq_callback_t *callbacks[],
const char * const names[],
struct irq_affinity *desc)
{
return vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names, NULL, desc);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael S. Tsirkin | 60 | 100.00% | 2 | 100.00% |
| Total | 60 | 100.00% | 2 | 100.00% |
static inline
int virtio_find_vqs_ctx(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[], vq_callback_t *callbacks[],
const char * const names[], const bool *ctx,
struct irq_affinity *desc)
{
return vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names, ctx,
desc);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael S. Tsirkin | 65 | 100.00% | 2 | 100.00% |
| Total | 65 | 100.00% | 2 | 100.00% |
/**
* virtio_device_ready - enable vq use in probe function
* @vdev: the device
*
* Driver must call this to use vqs in the probe function.
*
* Note: vqs are enabled automatically after probe returns.
*/
static inline
void virtio_device_ready(struct virtio_device *dev)
{
unsigned status = dev->config->get_status(dev);
BUG_ON(status & VIRTIO_CONFIG_S_DRIVER_OK);
dev->config->set_status(dev, status | VIRTIO_CONFIG_S_DRIVER_OK);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael S. Tsirkin | 44 | 100.00% | 1 | 100.00% |
| Total | 44 | 100.00% | 1 | 100.00% |
static inline
const char *virtio_bus_name(struct virtio_device *vdev)
{
if (!vdev->config->bus_name)
return "virtio";
return vdev->config->bus_name(vdev);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Rick Jones | 36 | 100.00% | 1 | 100.00% |
| Total | 36 | 100.00% | 1 | 100.00% |
/**
* virtqueue_set_affinity - setting affinity for a virtqueue
* @vq: the virtqueue
* @cpu: the cpu no.
*
* Pay attention the function are best-effort: the affinity hint may not be set
* due to config support, irq type and sharing.
*
*/
static inline
int virtqueue_set_affinity(struct virtqueue *vq, int cpu)
{
struct virtio_device *vdev = vq->vdev;
if (vdev->config->set_vq_affinity)
return vdev->config->set_vq_affinity(vq, cpu);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jason (Hui) Wang | 47 | 100.00% | 1 | 100.00% |
| Total | 47 | 100.00% | 1 | 100.00% |
static inline bool virtio_is_little_endian(struct virtio_device *vdev)
{
return virtio_has_feature(vdev, VIRTIO_F_VERSION_1) ||
virtio_legacy_is_little_endian();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Greg Kurz | 23 | 100.00% | 2 | 100.00% |
| Total | 23 | 100.00% | 2 | 100.00% |
/* Memory accessors */
static inline u16 virtio16_to_cpu(struct virtio_device *vdev, __virtio16 val)
{
return __virtio16_to_cpu(virtio_is_little_endian(vdev), val);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael S. Tsirkin | 25 | 96.15% | 1 | 50.00% |
| Greg Kurz | 1 | 3.85% | 1 | 50.00% |
| Total | 26 | 100.00% | 2 | 100.00% |
static inline __virtio16 cpu_to_virtio16(struct virtio_device *vdev, u16 val)
{
return __cpu_to_virtio16(virtio_is_little_endian(vdev), val);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael S. Tsirkin | 25 | 96.15% | 1 | 50.00% |
| Greg Kurz | 1 | 3.85% | 1 | 50.00% |
| Total | 26 | 100.00% | 2 | 100.00% |
static inline u32 virtio32_to_cpu(struct virtio_device *vdev, __virtio32 val)
{
return __virtio32_to_cpu(virtio_is_little_endian(vdev), val);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael S. Tsirkin | 25 | 96.15% | 1 | 50.00% |
| Greg Kurz | 1 | 3.85% | 1 | 50.00% |
| Total | 26 | 100.00% | 2 | 100.00% |
static inline __virtio32 cpu_to_virtio32(struct virtio_device *vdev, u32 val)
{
return __cpu_to_virtio32(virtio_is_little_endian(vdev), val);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael S. Tsirkin | 25 | 96.15% | 1 | 50.00% |
| Greg Kurz | 1 | 3.85% | 1 | 50.00% |
| Total | 26 | 100.00% | 2 | 100.00% |
static inline u64 virtio64_to_cpu(struct virtio_device *vdev, __virtio64 val)
{
return __virtio64_to_cpu(virtio_is_little_endian(vdev), val);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael S. Tsirkin | 25 | 96.15% | 1 | 50.00% |
| Greg Kurz | 1 | 3.85% | 1 | 50.00% |
| Total | 26 | 100.00% | 2 | 100.00% |
static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val)
{
return __cpu_to_virtio64(virtio_is_little_endian(vdev), val);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael S. Tsirkin | 25 | 96.15% | 1 | 50.00% |
| Greg Kurz | 1 | 3.85% | 1 | 50.00% |
| Total | 26 | 100.00% | 2 | 100.00% |
/* Config space accessors. */
#define virtio_cread(vdev, structname, member, ptr) \
do { \
/* Must match the member's type, and be integer */ \
if (!typecheck(typeof((((structname*)0)->member)), *(ptr))) \
(*ptr) = 1; \
\
switch (sizeof(*ptr)) { \
case 1: \
*(ptr) = virtio_cread8(vdev, \
offsetof(structname, member)); \
break; \
case 2: \
*(ptr) = virtio_cread16(vdev, \
offsetof(structname, member)); \
break; \
case 4: \
*(ptr) = virtio_cread32(vdev, \
offsetof(structname, member)); \
break; \
case 8: \
*(ptr) = virtio_cread64(vdev, \
offsetof(structname, member)); \
break; \
default: \
BUG(); \
} \
} while(0)
/* Config space accessors. */
#define virtio_cwrite(vdev, structname, member, ptr) \
do { \
/* Must match the member's type, and be integer */ \
if (!typecheck(typeof((((structname*)0)->member)), *(ptr))) \
BUG_ON((*ptr) == 1); \
\
switch (sizeof(*ptr)) { \
case 1: \
virtio_cwrite8(vdev, \
offsetof(structname, member), \
*(ptr)); \
break; \
case 2: \
virtio_cwrite16(vdev, \
offsetof(structname, member), \
*(ptr)); \
break; \
case 4: \
virtio_cwrite32(vdev, \
offsetof(structname, member), \
*(ptr)); \
break; \
case 8: \
virtio_cwrite64(vdev, \
offsetof(structname, member), \
*(ptr)); \
break; \
default: \
BUG(); \
} \
} 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;
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael S. Tsirkin | 89 | 74.17% | 2 | 66.67% |
| Rusty Russell | 31 | 25.83% | 1 | 33.33% |
| Total | 120 | 100.00% | 3 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael S. Tsirkin | 32 | 88.89% | 2 | 66.67% |
| Rusty Russell | 4 | 11.11% | 1 | 33.33% |
| Total | 36 | 100.00% | 3 | 100.00% |
static inline u8 virtio_cread8(struct virtio_device *vdev, unsigned int offset)
{
u8 ret;
vdev->config->get(vdev, offset, &ret, sizeof(ret));
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael S. Tsirkin | 41 | 100.00% | 1 | 100.00% |
| Total | 41 | 100.00% | 1 | 100.00% |
static inline void virtio_cwrite8(struct virtio_device *vdev,
unsigned int offset, u8 val)
{
vdev->config->set(vdev, offset, &val, sizeof(val));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Rusty Russell | 38 | 100.00% | 1 | 100.00% |
| Total | 38 | 100.00% | 1 | 100.00% |
static inline u16 virtio_cread16(struct virtio_device *vdev,
unsigned int offset)
{
u16 ret;
vdev->config->get(vdev, offset, &ret, sizeof(ret));
return virtio16_to_cpu(vdev, (__force __virtio16)ret);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Rusty Russell | 41 | 82.00% | 1 | 50.00% |
| Michael S. Tsirkin | 9 | 18.00% | 1 | 50.00% |
| Total | 50 | 100.00% | 2 | 100.00% |
static inline void virtio_cwrite16(struct virtio_device *vdev,
unsigned int offset, u16 val)
{
val = (__force u16)cpu_to_virtio16(vdev, val);
vdev->config->set(vdev, offset, &val, sizeof(val));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Rusty Russell | 38 | 74.51% | 1 | 50.00% |
| Michael S. Tsirkin | 13 | 25.49% | 1 | 50.00% |
| Total | 51 | 100.00% | 2 | 100.00% |
static inline u32 virtio_cread32(struct virtio_device *vdev,
unsigned int offset)
{
u32 ret;
vdev->config->get(vdev, offset, &ret, sizeof(ret));
return virtio32_to_cpu(vdev, (__force __virtio32)ret);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Rusty Russell | 41 | 82.00% | 1 | 50.00% |
| Michael S. Tsirkin | 9 | 18.00% | 1 | 50.00% |
| Total | 50 | 100.00% | 2 | 100.00% |
static inline void virtio_cwrite32(struct virtio_device *vdev,
unsigned int offset, u32 val)
{
val = (__force u32)cpu_to_virtio32(vdev, val);
vdev->config->set(vdev, offset, &val, sizeof(val));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Rusty Russell | 38 | 74.51% | 1 | 50.00% |
| Michael S. Tsirkin | 13 | 25.49% | 1 | 50.00% |
| Total | 51 | 100.00% | 2 | 100.00% |
static inline u64 virtio_cread64(struct virtio_device *vdev,
unsigned int offset)
{
u64 ret;
__virtio_cread_many(vdev, offset, &ret, 1, sizeof(ret));
return virtio64_to_cpu(vdev, (__force __virtio64)ret);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael S. Tsirkin | 26 | 54.17% | 2 | 66.67% |
| Rusty Russell | 22 | 45.83% | 1 | 33.33% |
| Total | 48 | 100.00% | 3 | 100.00% |
static inline void virtio_cwrite64(struct virtio_device *vdev,
unsigned int offset, u64 val)
{
val = (__force u64)cpu_to_virtio64(vdev, val);
vdev->config->set(vdev, offset, &val, sizeof(val));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Rusty Russell | 38 | 74.51% | 1 | 50.00% |
| Michael S. Tsirkin | 13 | 25.49% | 1 | 50.00% |
| Total | 51 | 100.00% | 2 | 100.00% |
/* 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; \
})
#endif /* _LINUX_VIRTIO_CONFIG_H */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Michael S. Tsirkin | 857 | 53.60% | 14 | 42.42% |
| Rusty Russell | 558 | 34.90% | 9 | 27.27% |
| Jason (Hui) Wang | 63 | 3.94% | 1 | 3.03% |
| Rick Jones | 50 | 3.13% | 1 | 3.03% |
| Greg Kurz | 29 | 1.81% | 2 | 6.06% |
| Christoph Hellwig | 29 | 1.81% | 2 | 6.06% |
| Mark McLoughlin | 6 | 0.38% | 1 | 3.03% |
| David Howells | 4 | 0.25% | 1 | 3.03% |
| Paul Gortmaker | 2 | 0.13% | 1 | 3.03% |
| Stefan Hajnoczi | 1 | 0.06% | 1 | 3.03% |
| Total | 1599 | 100.00% | 33 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.