drivers/vdpa/vdpa_sim/vdpa_sim.h

Source file repositories/reference/linux-study-clean/drivers/vdpa/vdpa_sim/vdpa_sim.h

File Facts

System
Linux kernel
Corpus path
drivers/vdpa/vdpa_sim/vdpa_sim.h
Extension
.h
Size
3091 bytes
Lines
122
Domain
Driver Families
Bucket
drivers/vdpa
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct vdpasim_virtqueue {
	struct vringh vring;
	struct vringh_kiov in_iov;
	struct vringh_kiov out_iov;
	unsigned short head;
	bool ready;
	u64 desc_addr;
	u64 device_addr;
	u64 driver_addr;
	u32 num;
	void *private;
	irqreturn_t (*cb)(void *data);
};

struct vdpasim_dev_attr {
	struct vdpa_mgmt_dev *mgmt_dev;
	const char *name;
	u64 supported_features;
	size_t alloc_size;
	size_t config_size;
	int nvqs;
	u32 id;
	u32 ngroups;
	u32 nas;

	void (*work_fn)(struct vdpasim *vdpasim);
	void (*get_config)(struct vdpasim *vdpasim, void *config);
	void (*set_config)(struct vdpasim *vdpasim, const void *config);
	int (*get_stats)(struct vdpasim *vdpasim, u16 idx,
			 struct sk_buff *msg,
			 struct netlink_ext_ack *extack);
	void (*free)(struct vdpasim *vdpasim);
};

/* State of each vdpasim device */
struct vdpasim {
	struct vdpa_device vdpa;
	struct vdpasim_virtqueue *vqs;
	struct kthread_worker *worker;
	struct kthread_work work;
	struct mm_struct *mm_bound;
	struct vdpasim_dev_attr dev_attr;
	/* mutex to synchronize virtqueue state */
	struct mutex mutex;
	/* virtio config according to device type */
	void *config;
	struct vhost_iotlb *iommu;
	bool *iommu_pt;
	u32 status;
	u32 generation;
	u64 features;
	u32 groups;
	bool running;
	bool pending_kick;
	/* spinlock to synchronize iommu table */
	spinlock_t iommu_lock;
};

struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *attr,
			       const struct vdpa_dev_set_config *config);
void vdpasim_schedule_work(struct vdpasim *vdpasim);

/* TODO: cross-endian support */
static inline bool vdpasim_is_little_endian(struct vdpasim *vdpasim)
{
	return virtio_legacy_is_little_endian() ||
		(vdpasim->features & (1ULL << VIRTIO_F_VERSION_1));
}

static inline u16 vdpasim16_to_cpu(struct vdpasim *vdpasim, __virtio16 val)
{
	return __virtio16_to_cpu(vdpasim_is_little_endian(vdpasim), val);
}

static inline __virtio16 cpu_to_vdpasim16(struct vdpasim *vdpasim, u16 val)
{
	return __cpu_to_virtio16(vdpasim_is_little_endian(vdpasim), val);
}

static inline u32 vdpasim32_to_cpu(struct vdpasim *vdpasim, __virtio32 val)
{
	return __virtio32_to_cpu(vdpasim_is_little_endian(vdpasim), val);
}

static inline __virtio32 cpu_to_vdpasim32(struct vdpasim *vdpasim, u32 val)
{
	return __cpu_to_virtio32(vdpasim_is_little_endian(vdpasim), val);
}

static inline u64 vdpasim64_to_cpu(struct vdpasim *vdpasim, __virtio64 val)

Annotation

Implementation Notes