mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-19 08:28:51 +09:00
![Bin Meng](/assets/img/avatar_default.png)
This adds a new virtio uclass driver for “virtio” [1] family of devices that are are found in virtual environments like QEMU, yet by design they look like physical devices to the guest. The uclass driver provides child_pre_probe() and child_post_probe() methods to do some common operations for virtio device drivers like device and driver supported feature negotiation, etc. [1] http://docs.oasis-open.org/virtio/virtio/v1.0/virtio-v1.0.pdf Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi> Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
708 lines
19 KiB
C
708 lines
19 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* Copyright (C) 2018, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
|
|
* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
|
|
*
|
|
* VirtIO is a virtualization standard for network and disk device drivers
|
|
* where just the guest's device driver "knows" it is running in a virtual
|
|
* environment, and cooperates with the hypervisor. This enables guests to
|
|
* get high performance network and disk operations, and gives most of the
|
|
* performance benefits of paravirtualization. In the U-Boot case, the guest
|
|
* is U-Boot itself, while the virtual environment are normally QEMU targets
|
|
* like ARM, RISC-V and x86.
|
|
*
|
|
* See http://docs.oasis-open.org/virtio/virtio/v1.0/virtio-v1.0.pdf for
|
|
* the VirtIO specification v1.0.
|
|
*
|
|
* This file is largely based on Linux kernel virtio_*.h files
|
|
*/
|
|
|
|
#ifndef __VIRTIO_H__
|
|
#define __VIRTIO_H__
|
|
|
|
#define VIRTIO_ID_NET 1 /* virtio net */
|
|
#define VIRTIO_ID_BLOCK 2 /* virtio block */
|
|
#define VIRTIO_ID_MAX_NUM 3
|
|
|
|
#define VIRTIO_NET_DRV_NAME "virtio-net"
|
|
#define VIRTIO_BLK_DRV_NAME "virtio-blk"
|
|
|
|
/* Status byte for guest to report progress, and synchronize features */
|
|
|
|
/* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
|
|
#define VIRTIO_CONFIG_S_ACKNOWLEDGE 1
|
|
/* We have found a driver for the device */
|
|
#define VIRTIO_CONFIG_S_DRIVER 2
|
|
/* Driver has used its parts of the config, and is happy */
|
|
#define VIRTIO_CONFIG_S_DRIVER_OK 4
|
|
/* Driver has finished configuring features */
|
|
#define VIRTIO_CONFIG_S_FEATURES_OK 8
|
|
/* Device entered invalid state, driver must reset it */
|
|
#define VIRTIO_CONFIG_S_NEEDS_RESET 0x40
|
|
/* We've given up on this device */
|
|
#define VIRTIO_CONFIG_S_FAILED 0x80
|
|
|
|
/*
|
|
* Virtio feature bits VIRTIO_TRANSPORT_F_START through VIRTIO_TRANSPORT_F_END
|
|
* are reserved for the transport being used (eg: virtio_ring, virtio_pci etc.),
|
|
* the rest are per-device feature bits.
|
|
*/
|
|
#define VIRTIO_TRANSPORT_F_START 28
|
|
#define VIRTIO_TRANSPORT_F_END 38
|
|
|
|
#ifndef VIRTIO_CONFIG_NO_LEGACY
|
|
/*
|
|
* Do we get callbacks when the ring is completely used,
|
|
* even if we've suppressed them?
|
|
*/
|
|
#define VIRTIO_F_NOTIFY_ON_EMPTY 24
|
|
|
|
/* Can the device handle any descriptor layout? */
|
|
#define VIRTIO_F_ANY_LAYOUT 27
|
|
#endif /* VIRTIO_CONFIG_NO_LEGACY */
|
|
|
|
/* v1.0 compliant */
|
|
#define VIRTIO_F_VERSION_1 32
|
|
|
|
/*
|
|
* If clear - device has the IOMMU bypass quirk feature.
|
|
* If set - use platform tools to detect the IOMMU.
|
|
*
|
|
* Note the reverse polarity (compared to most other features),
|
|
* this is for compatibility with legacy systems.
|
|
*/
|
|
#define VIRTIO_F_IOMMU_PLATFORM 33
|
|
|
|
/* Does the device support Single Root I/O Virtualization? */
|
|
#define VIRTIO_F_SR_IOV 37
|
|
|
|
/**
|
|
* virtio scatter-gather struct
|
|
*
|
|
* @addr: sg buffer address
|
|
* @lengh: sg buffer length
|
|
*/
|
|
struct virtio_sg {
|
|
void *addr;
|
|
size_t length;
|
|
};
|
|
|
|
struct virtqueue;
|
|
|
|
/* virtio bus operations */
|
|
struct dm_virtio_ops {
|
|
/**
|
|
* get_config() - read the value of a configuration field
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @offset: the offset of the configuration field
|
|
* @buf: the buffer to write the field value into
|
|
* @len: the length of the buffer
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int (*get_config)(struct udevice *vdev, unsigned int offset,
|
|
void *buf, unsigned int len);
|
|
/**
|
|
* set_config() - write the value of a configuration field
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @offset: the offset of the configuration field
|
|
* @buf: the buffer to read the field value from
|
|
* @len: the length of the buffer
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int (*set_config)(struct udevice *vdev, unsigned int offset,
|
|
const void *buf, unsigned int len);
|
|
/**
|
|
* generation() - config generation counter
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @counter: the returned config generation counter
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int (*generation)(struct udevice *vdev, u32 *counter);
|
|
/**
|
|
* get_status() - read the status byte
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @status: the returned status byte
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int (*get_status)(struct udevice *vdev, u8 *status);
|
|
/**
|
|
* set_status() - write the status byte
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @status: the new status byte
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int (*set_status)(struct udevice *vdev, u8 status);
|
|
/**
|
|
* reset() - reset the device
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int (*reset)(struct udevice *vdev);
|
|
/**
|
|
* get_features() - get the array of feature bits for this device
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @features: the first 32 feature bits (all we currently need)
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int (*get_features)(struct udevice *vdev, u64 *features);
|
|
/**
|
|
* set_features() - confirm what device features we'll be using
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int (*set_features)(struct udevice *vdev);
|
|
/**
|
|
* find_vqs() - find virtqueues and instantiate them
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @nvqs: the number of virtqueues to find
|
|
* @vqs: on success, includes new virtqueues
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int (*find_vqs)(struct udevice *vdev, unsigned int nvqs,
|
|
struct virtqueue *vqs[]);
|
|
/**
|
|
* del_vqs() - free virtqueues found by find_vqs()
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int (*del_vqs)(struct udevice *vdev);
|
|
/**
|
|
* notify() - notify the device to process the queue
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @vq: virtqueue to process
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int (*notify)(struct udevice *vdev, struct virtqueue *vq);
|
|
};
|
|
|
|
/* Get access to a virtio bus' operations */
|
|
#define virtio_get_ops(dev) ((struct dm_virtio_ops *)(dev)->driver->ops)
|
|
|
|
/**
|
|
* virtio uclass per device private data
|
|
*
|
|
* @vqs: virtualqueue for the virtio device
|
|
* @vdev: the real virtio device underneath
|
|
* @legacy: is it a legacy device?
|
|
* @device: virtio device ID
|
|
* @vendor: virtio vendor ID
|
|
* @features: negotiated supported features
|
|
* @feature_table: an array of feature supported by the driver
|
|
* @feature_table_size: number of entries in the feature table array
|
|
* @feature_table_legacy: same as feature_table but working in legacy mode
|
|
* @feature_table_size_legacy: number of entries in feature table legacy array
|
|
*/
|
|
struct virtio_dev_priv {
|
|
struct list_head vqs;
|
|
struct udevice *vdev;
|
|
bool legacy;
|
|
u32 device;
|
|
u32 vendor;
|
|
u64 features;
|
|
const u32 *feature_table;
|
|
u32 feature_table_size;
|
|
const u32 *feature_table_legacy;
|
|
u32 feature_table_size_legacy;
|
|
};
|
|
|
|
/**
|
|
* virtio_get_config() - read the value of a configuration field
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @offset: the offset of the configuration field
|
|
* @buf: the buffer to write the field value into
|
|
* @len: the length of the buffer
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int virtio_get_config(struct udevice *vdev, unsigned int offset,
|
|
void *buf, unsigned int len);
|
|
|
|
/**
|
|
* virtio_set_config() - write the value of a configuration field
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @offset: the offset of the configuration field
|
|
* @buf: the buffer to read the field value from
|
|
* @len: the length of the buffer
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int virtio_set_config(struct udevice *vdev, unsigned int offset,
|
|
void *buf, unsigned int len);
|
|
|
|
/**
|
|
* virtio_generation() - config generation counter
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @counter: the returned config generation counter
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int virtio_generation(struct udevice *vdev, u32 *counter);
|
|
|
|
/**
|
|
* virtio_get_status() - read the status byte
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @status: the returned status byte
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int virtio_get_status(struct udevice *vdev, u8 *status);
|
|
|
|
/**
|
|
* virtio_set_status() - write the status byte
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @status: the new status byte
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int virtio_set_status(struct udevice *vdev, u8 status);
|
|
|
|
/**
|
|
* virtio_reset() - reset the device
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int virtio_reset(struct udevice *vdev);
|
|
|
|
/**
|
|
* virtio_get_features() - get the array of feature bits for this device
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @features: the first 32 feature bits (all we currently need)
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int virtio_get_features(struct udevice *vdev, u64 *features);
|
|
|
|
/**
|
|
* virtio_set_features() - confirm what device features we'll be using
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int virtio_set_features(struct udevice *vdev);
|
|
|
|
/**
|
|
* virtio_find_vqs() - find virtqueues and instantiate them
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @nvqs: the number of virtqueues to find
|
|
* @vqs: on success, includes new virtqueues
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int virtio_find_vqs(struct udevice *vdev, unsigned int nvqs,
|
|
struct virtqueue *vqs[]);
|
|
|
|
/**
|
|
* virtio_del_vqs() - free virtqueues found by find_vqs()
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int virtio_del_vqs(struct udevice *vdev);
|
|
|
|
/**
|
|
* virtio_notify() - notify the device to process the queue
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @vq: virtqueue to process
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int virtio_notify(struct udevice *vdev, struct virtqueue *vq);
|
|
|
|
/**
|
|
* virtio_add_status() - helper to set a new status code to the device
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @status: new status code to be added
|
|
*/
|
|
void virtio_add_status(struct udevice *vdev, u8 status);
|
|
|
|
/**
|
|
* virtio_finalize_features() - helper to finalize features
|
|
*
|
|
* @vdev: the real virtio device
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int virtio_finalize_features(struct udevice *vdev);
|
|
|
|
/**
|
|
* virtio_driver_features_init() - initialize driver supported features
|
|
*
|
|
* This fills in the virtio device parent per child private data with the given
|
|
* information, which contains driver supported features and legacy features.
|
|
*
|
|
* This API should be called in the virtio device driver's bind method, so that
|
|
* later virtio transport uclass driver can utilize the driver supplied features
|
|
* to negotiate with the device on the final supported features.
|
|
*
|
|
* @priv: virtio uclass per device private data
|
|
* @feature: an array of feature supported by the driver
|
|
* @feature_size: number of entries in the feature table array
|
|
* @feature_legacy: same as feature_table but working in legacy mode
|
|
* @feature_legacy_size:number of entries in feature table legacy array
|
|
*/
|
|
void virtio_driver_features_init(struct virtio_dev_priv *priv,
|
|
const u32 *feature,
|
|
u32 feature_size,
|
|
const u32 *feature_legacy,
|
|
u32 feature_legacy_size);
|
|
|
|
/**
|
|
* virtio_init() - helper to enumerate all known virtio devices
|
|
*
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int virtio_init(void);
|
|
|
|
static inline u16 __virtio16_to_cpu(bool little_endian, __virtio16 val)
|
|
{
|
|
if (little_endian)
|
|
return le16_to_cpu((__force __le16)val);
|
|
else
|
|
return be16_to_cpu((__force __be16)val);
|
|
}
|
|
|
|
static inline __virtio16 __cpu_to_virtio16(bool little_endian, u16 val)
|
|
{
|
|
if (little_endian)
|
|
return (__force __virtio16)cpu_to_le16(val);
|
|
else
|
|
return (__force __virtio16)cpu_to_be16(val);
|
|
}
|
|
|
|
static inline u32 __virtio32_to_cpu(bool little_endian, __virtio32 val)
|
|
{
|
|
if (little_endian)
|
|
return le32_to_cpu((__force __le32)val);
|
|
else
|
|
return be32_to_cpu((__force __be32)val);
|
|
}
|
|
|
|
static inline __virtio32 __cpu_to_virtio32(bool little_endian, u32 val)
|
|
{
|
|
if (little_endian)
|
|
return (__force __virtio32)cpu_to_le32(val);
|
|
else
|
|
return (__force __virtio32)cpu_to_be32(val);
|
|
}
|
|
|
|
static inline u64 __virtio64_to_cpu(bool little_endian, __virtio64 val)
|
|
{
|
|
if (little_endian)
|
|
return le64_to_cpu((__force __le64)val);
|
|
else
|
|
return be64_to_cpu((__force __be64)val);
|
|
}
|
|
|
|
static inline __virtio64 __cpu_to_virtio64(bool little_endian, u64 val)
|
|
{
|
|
if (little_endian)
|
|
return (__force __virtio64)cpu_to_le64(val);
|
|
else
|
|
return (__force __virtio64)cpu_to_be64(val);
|
|
}
|
|
|
|
/**
|
|
* __virtio_test_bit - helper to test feature bits
|
|
*
|
|
* For use by transports. Devices should normally use virtio_has_feature,
|
|
* which includes more checks.
|
|
*
|
|
* @udev: the transport device
|
|
* @fbit: the feature bit
|
|
*/
|
|
static inline bool __virtio_test_bit(struct udevice *udev, unsigned int fbit)
|
|
{
|
|
struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(udev);
|
|
|
|
/* Did you forget to fix assumptions on max features? */
|
|
if (__builtin_constant_p(fbit))
|
|
BUILD_BUG_ON(fbit >= 64);
|
|
else
|
|
WARN_ON(fbit >= 64);
|
|
|
|
return uc_priv->features & BIT_ULL(fbit);
|
|
}
|
|
|
|
/**
|
|
* __virtio_set_bit - helper to set feature bits
|
|
*
|
|
* For use by transports.
|
|
*
|
|
* @udev: the transport device
|
|
* @fbit: the feature bit
|
|
*/
|
|
static inline void __virtio_set_bit(struct udevice *udev, unsigned int fbit)
|
|
{
|
|
struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(udev);
|
|
|
|
/* Did you forget to fix assumptions on max features? */
|
|
if (__builtin_constant_p(fbit))
|
|
BUILD_BUG_ON(fbit >= 64);
|
|
else
|
|
WARN_ON(fbit >= 64);
|
|
|
|
uc_priv->features |= BIT_ULL(fbit);
|
|
}
|
|
|
|
/**
|
|
* __virtio_clear_bit - helper to clear feature bits
|
|
*
|
|
* For use by transports.
|
|
*
|
|
* @vdev: the transport device
|
|
* @fbit: the feature bit
|
|
*/
|
|
static inline void __virtio_clear_bit(struct udevice *udev, unsigned int fbit)
|
|
{
|
|
struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(udev);
|
|
|
|
/* Did you forget to fix assumptions on max features? */
|
|
if (__builtin_constant_p(fbit))
|
|
BUILD_BUG_ON(fbit >= 64);
|
|
else
|
|
WARN_ON(fbit >= 64);
|
|
|
|
uc_priv->features &= ~BIT_ULL(fbit);
|
|
}
|
|
|
|
/**
|
|
* virtio_has_feature - helper to determine if this device has this feature
|
|
*
|
|
* Note this API is only usable after the virtio device driver's bind phase,
|
|
* as the feature has been negotiated between the device and the driver.
|
|
*
|
|
* @vdev: the virtio device
|
|
* @fbit: the feature bit
|
|
*/
|
|
static inline bool virtio_has_feature(struct udevice *vdev, unsigned int fbit)
|
|
{
|
|
if (!(vdev->flags & DM_FLAG_BOUND))
|
|
WARN_ON(true);
|
|
|
|
return __virtio_test_bit(vdev->parent, fbit);
|
|
}
|
|
|
|
static inline bool virtio_legacy_is_little_endian(void)
|
|
{
|
|
#ifdef __LITTLE_ENDIAN
|
|
return true;
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
static inline bool virtio_is_little_endian(struct udevice *vdev)
|
|
{
|
|
struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(vdev->parent);
|
|
|
|
return !uc_priv->legacy || virtio_legacy_is_little_endian();
|
|
}
|
|
|
|
/* Memory accessors */
|
|
static inline u16 virtio16_to_cpu(struct udevice *vdev, __virtio16 val)
|
|
{
|
|
return __virtio16_to_cpu(virtio_is_little_endian(vdev), val);
|
|
}
|
|
|
|
static inline __virtio16 cpu_to_virtio16(struct udevice *vdev, u16 val)
|
|
{
|
|
return __cpu_to_virtio16(virtio_is_little_endian(vdev), val);
|
|
}
|
|
|
|
static inline u32 virtio32_to_cpu(struct udevice *vdev, __virtio32 val)
|
|
{
|
|
return __virtio32_to_cpu(virtio_is_little_endian(vdev), val);
|
|
}
|
|
|
|
static inline __virtio32 cpu_to_virtio32(struct udevice *vdev, u32 val)
|
|
{
|
|
return __cpu_to_virtio32(virtio_is_little_endian(vdev), val);
|
|
}
|
|
|
|
static inline u64 virtio64_to_cpu(struct udevice *vdev, __virtio64 val)
|
|
{
|
|
return __virtio64_to_cpu(virtio_is_little_endian(vdev), val);
|
|
}
|
|
|
|
static inline __virtio64 cpu_to_virtio64(struct udevice *vdev, u64 val)
|
|
{
|
|
return __cpu_to_virtio64(virtio_is_little_endian(vdev), val);
|
|
}
|
|
|
|
/* Read @count fields, @bytes each */
|
|
static inline void __virtio_cread_many(struct udevice *vdev,
|
|
unsigned int offset,
|
|
void *buf, size_t count, size_t bytes)
|
|
{
|
|
u32 old, gen;
|
|
int i;
|
|
|
|
/* no need to check return value as generation can be optional */
|
|
virtio_generation(vdev, &gen);
|
|
do {
|
|
old = gen;
|
|
|
|
for (i = 0; i < count; i++)
|
|
virtio_get_config(vdev, offset + bytes * i,
|
|
buf + i * bytes, bytes);
|
|
|
|
virtio_generation(vdev, &gen);
|
|
} while (gen != old);
|
|
}
|
|
|
|
static inline void virtio_cread_bytes(struct udevice *vdev,
|
|
unsigned int offset,
|
|
void *buf, size_t len)
|
|
{
|
|
__virtio_cread_many(vdev, offset, buf, len, 1);
|
|
}
|
|
|
|
static inline u8 virtio_cread8(struct udevice *vdev, unsigned int offset)
|
|
{
|
|
u8 ret;
|
|
|
|
virtio_get_config(vdev, offset, &ret, sizeof(ret));
|
|
return ret;
|
|
}
|
|
|
|
static inline void virtio_cwrite8(struct udevice *vdev,
|
|
unsigned int offset, u8 val)
|
|
{
|
|
virtio_set_config(vdev, offset, &val, sizeof(val));
|
|
}
|
|
|
|
static inline u16 virtio_cread16(struct udevice *vdev,
|
|
unsigned int offset)
|
|
{
|
|
u16 ret;
|
|
|
|
virtio_get_config(vdev, offset, &ret, sizeof(ret));
|
|
return virtio16_to_cpu(vdev, (__force __virtio16)ret);
|
|
}
|
|
|
|
static inline void virtio_cwrite16(struct udevice *vdev,
|
|
unsigned int offset, u16 val)
|
|
{
|
|
val = (__force u16)cpu_to_virtio16(vdev, val);
|
|
virtio_set_config(vdev, offset, &val, sizeof(val));
|
|
}
|
|
|
|
static inline u32 virtio_cread32(struct udevice *vdev,
|
|
unsigned int offset)
|
|
{
|
|
u32 ret;
|
|
|
|
virtio_get_config(vdev, offset, &ret, sizeof(ret));
|
|
return virtio32_to_cpu(vdev, (__force __virtio32)ret);
|
|
}
|
|
|
|
static inline void virtio_cwrite32(struct udevice *vdev,
|
|
unsigned int offset, u32 val)
|
|
{
|
|
val = (__force u32)cpu_to_virtio32(vdev, val);
|
|
virtio_set_config(vdev, offset, &val, sizeof(val));
|
|
}
|
|
|
|
static inline u64 virtio_cread64(struct udevice *vdev,
|
|
unsigned int offset)
|
|
{
|
|
u64 ret;
|
|
|
|
__virtio_cread_many(vdev, offset, &ret, 1, sizeof(ret));
|
|
return virtio64_to_cpu(vdev, (__force __virtio64)ret);
|
|
}
|
|
|
|
static inline void virtio_cwrite64(struct udevice *vdev,
|
|
unsigned int offset, u64 val)
|
|
{
|
|
val = (__force u64)cpu_to_virtio64(vdev, val);
|
|
virtio_set_config(vdev, offset, &val, sizeof(val));
|
|
}
|
|
|
|
/* Config space read accessor */
|
|
#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: \
|
|
WARN_ON(true); \
|
|
} \
|
|
} while (0)
|
|
|
|
/* Config space write accessor */
|
|
#define virtio_cwrite(vdev, structname, member, ptr) \
|
|
do { \
|
|
/* Must match the member's type, and be integer */ \
|
|
if (!typecheck(typeof((((structname *)0)->member)), *(ptr))) \
|
|
WARN_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: \
|
|
WARN_ON(true); \
|
|
} \
|
|
} while (0)
|
|
|
|
/* 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 /* __VIRTIO_H__ */
|