Current File : //usr/src/linux-headers-5.15.0-43/arch/powerpc/include/asm/vio.h
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* IBM PowerPC Virtual I/O Infrastructure Support.
*
* Copyright (c) 2003 IBM Corp.
* Dave Engebretsen engebret@us.ibm.com
* Santiago Leon santil@us.ibm.com
*/
#ifndef _ASM_POWERPC_VIO_H
#define _ASM_POWERPC_VIO_H
#ifdef __KERNEL__
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/mod_devicetable.h>
#include <linux/scatterlist.h>
#include <asm/hvcall.h>
/*
* Architecture-specific constants for drivers to
* extract attributes of the device using vio_get_attribute()
*/
#define VETH_MAC_ADDR "local-mac-address"
#define VETH_MCAST_FILTER_SIZE "ibm,mac-address-filters"
/* End architecture-specific constants */
#define h_vio_signal(ua, mode) \
plpar_hcall_norets(H_VIO_SIGNAL, ua, mode)
#define VIO_IRQ_DISABLE 0UL
#define VIO_IRQ_ENABLE 1UL
/*
* VIO CMO minimum entitlement for all devices and spare entitlement
*/
#define VIO_CMO_MIN_ENT 1562624
extern struct bus_type vio_bus_type;
struct iommu_table;
/*
* Platform Facilities Option (PFO)-specific data
*/
/* Starting unit address for PFO devices on the VIO BUS */
#define VIO_BASE_PFO_UA 0x50000000
/**
* vio_pfo_op - PFO operation parameters
*
* @flags: h_call subfunctions and modifiers
* @in: Input data block logical real address
* @inlen: If non-negative, the length of the input data block. If negative,
* the length of the input data descriptor list in bytes.
* @out: Output data block logical real address
* @outlen: If non-negative, the length of the input data block. If negative,
* the length of the input data descriptor list in bytes.
* @csbcpb: Logical real address of the 4k naturally-aligned storage block
* containing the CSB & optional FC field specific CPB
* @timeout: # of milliseconds to retry h_call, 0 for no timeout.
* @hcall_err: pointer to return the h_call return value, else NULL
*/
struct vio_pfo_op {
u64 flags;
s64 in;
s64 inlen;
s64 out;
s64 outlen;
u64 csbcpb;
void *done;
unsigned long handle;
unsigned int timeout;
long hcall_err;
};
/* End PFO specific data */
enum vio_dev_family {
VDEVICE, /* The OF node is a child of /vdevice */
PFO, /* The OF node is a child of /ibm,platform-facilities */
};
/**
* vio_dev - This structure is used to describe virtual I/O devices.
*
* @desired: set from return of driver's get_desired_dma() function
* @entitled: bytes of IO data that has been reserved for this device.
* @allocated: bytes of IO data currently in use by the device.
* @allocs_failed: number of DMA failures due to insufficient entitlement.
*/
struct vio_dev {
const char *name;
const char *type;
uint32_t unit_address;
uint32_t resource_id;
unsigned int irq;
struct {
size_t desired;
size_t entitled;
size_t allocated;
atomic_t allocs_failed;
} cmo;
enum vio_dev_family family;
struct device dev;
};
struct vio_driver {
const char *name;
const struct vio_device_id *id_table;
int (*probe)(struct vio_dev *dev, const struct vio_device_id *id);
void (*remove)(struct vio_dev *dev);
void (*shutdown)(struct vio_dev *dev);
/* A driver must have a get_desired_dma() function to
* be loaded in a CMO environment if it uses DMA.
*/
unsigned long (*get_desired_dma)(struct vio_dev *dev);
const struct dev_pm_ops *pm;
struct device_driver driver;
};
extern int __vio_register_driver(struct vio_driver *drv, struct module *owner,
const char *mod_name);
/*
* vio_register_driver must be a macro so that KBUILD_MODNAME can be expanded
*/
#define vio_register_driver(driver) \
__vio_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
extern void vio_unregister_driver(struct vio_driver *drv);
extern int vio_cmo_entitlement_update(size_t);
extern void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired);
extern void vio_unregister_device(struct vio_dev *dev);
extern int vio_h_cop_sync(struct vio_dev *vdev, struct vio_pfo_op *op);
struct device_node;
extern struct vio_dev *vio_register_device_node(
struct device_node *node_vdev);
extern const void *vio_get_attribute(struct vio_dev *vdev, char *which,
int *length);
#ifdef CONFIG_PPC_PSERIES
extern struct vio_dev *vio_find_node(struct device_node *vnode);
extern int vio_enable_interrupts(struct vio_dev *dev);
extern int vio_disable_interrupts(struct vio_dev *dev);
#else
static inline int vio_enable_interrupts(struct vio_dev *dev)
{
return 0;
}
#endif
static inline struct vio_driver *to_vio_driver(struct device_driver *drv)
{
return container_of(drv, struct vio_driver, driver);
}
static inline struct vio_dev *to_vio_dev(struct device *dev)
{
return container_of(dev, struct vio_dev, dev);
}
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_VIO_H */
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