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d0c0bce831
Parse the FFA nodes from the device-tree and register all the partitions whose services will be used in the kernel. In order to also enable in-kernel users of FFA interface, let us add simple set of operations for such devices. The in-kernel users are registered without the character device interface. Link: https://lore.kernel.org/r/20210521151033.181846-5-sudeep.holla@arm.com Tested-by: Jens Wiklander <jens.wiklander@linaro.org> Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
128 lines
3.4 KiB
C
128 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2021 ARM Ltd.
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*/
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#ifndef _LINUX_ARM_FFA_H
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#define _LINUX_ARM_FFA_H
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/uuid.h>
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/* FFA Bus/Device/Driver related */
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struct ffa_device {
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int vm_id;
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bool mode_32bit;
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uuid_t uuid;
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struct device dev;
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};
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#define to_ffa_dev(d) container_of(d, struct ffa_device, dev)
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struct ffa_device_id {
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uuid_t uuid;
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};
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struct ffa_driver {
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const char *name;
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int (*probe)(struct ffa_device *sdev);
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void (*remove)(struct ffa_device *sdev);
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const struct ffa_device_id *id_table;
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struct device_driver driver;
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};
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#define to_ffa_driver(d) container_of(d, struct ffa_driver, driver)
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static inline void ffa_dev_set_drvdata(struct ffa_device *fdev, void *data)
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{
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fdev->dev.driver_data = data;
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}
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#if IS_REACHABLE(CONFIG_ARM_FFA_TRANSPORT)
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struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id);
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void ffa_device_unregister(struct ffa_device *ffa_dev);
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int ffa_driver_register(struct ffa_driver *driver, struct module *owner,
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const char *mod_name);
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void ffa_driver_unregister(struct ffa_driver *driver);
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bool ffa_device_is_valid(struct ffa_device *ffa_dev);
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const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev);
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#else
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static inline
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struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id)
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{
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return NULL;
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}
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static inline void ffa_device_unregister(struct ffa_device *dev) {}
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static inline int
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ffa_driver_register(struct ffa_driver *driver, struct module *owner,
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const char *mod_name)
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{
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return -EINVAL;
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}
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static inline void ffa_driver_unregister(struct ffa_driver *driver) {}
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static inline
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bool ffa_device_is_valid(struct ffa_device *ffa_dev) { return false; }
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static inline
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const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev)
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{
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return NULL;
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}
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#endif /* CONFIG_ARM_FFA_TRANSPORT */
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#define ffa_register(driver) \
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ffa_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
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#define ffa_unregister(driver) \
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ffa_driver_unregister(driver)
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/**
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* module_ffa_driver() - Helper macro for registering a psa_ffa driver
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* @__ffa_driver: ffa_driver structure
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*
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* Helper macro for psa_ffa drivers to set up proper module init / exit
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* functions. Replaces module_init() and module_exit() and keeps people from
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* printing pointless things to the kernel log when their driver is loaded.
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*/
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#define module_ffa_driver(__ffa_driver) \
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module_driver(__ffa_driver, ffa_register, ffa_unregister)
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/* FFA transport related */
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struct ffa_partition_info {
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u16 id;
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u16 exec_ctxt;
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/* partition supports receipt of direct requests */
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#define FFA_PARTITION_DIRECT_RECV BIT(0)
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/* partition can send direct requests. */
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#define FFA_PARTITION_DIRECT_SEND BIT(1)
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/* partition can send and receive indirect messages. */
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#define FFA_PARTITION_INDIRECT_MSG BIT(2)
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u32 properties;
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};
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/* For use with FFA_MSG_SEND_DIRECT_{REQ,RESP} which pass data via registers */
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struct ffa_send_direct_data {
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unsigned long data0; /* w3/x3 */
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unsigned long data1; /* w4/x4 */
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unsigned long data2; /* w5/x5 */
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unsigned long data3; /* w6/x6 */
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unsigned long data4; /* w7/x7 */
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};
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struct ffa_dev_ops {
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u32 (*api_version_get)(void);
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int (*partition_info_get)(const char *uuid_str,
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struct ffa_partition_info *buffer);
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void (*mode_32bit_set)(struct ffa_device *dev);
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int (*sync_send_receive)(struct ffa_device *dev,
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struct ffa_send_direct_data *data);
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};
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#endif /* _LINUX_ARM_FFA_H */
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