268 lines
7.4 KiB
C
268 lines
7.4 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_mem_region_addr_range {
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/* The base IPA of the constituent memory region, aligned to 4 kiB */
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u64 address;
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/* The number of 4 kiB pages in the constituent memory region. */
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u32 pg_cnt;
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u32 reserved;
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};
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struct ffa_composite_mem_region {
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/*
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* The total number of 4 kiB pages included in this memory region. This
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* must be equal to the sum of page counts specified in each
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* `struct ffa_mem_region_addr_range`.
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*/
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u32 total_pg_cnt;
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/* The number of constituents included in this memory region range */
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u32 addr_range_cnt;
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u64 reserved;
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/** An array of `addr_range_cnt` memory region constituents. */
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struct ffa_mem_region_addr_range constituents[];
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};
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struct ffa_mem_region_attributes {
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/* The ID of the VM to which the memory is being given or shared. */
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u16 receiver;
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/*
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* The permissions with which the memory region should be mapped in the
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* receiver's page table.
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*/
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#define FFA_MEM_EXEC BIT(3)
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#define FFA_MEM_NO_EXEC BIT(2)
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#define FFA_MEM_RW BIT(1)
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#define FFA_MEM_RO BIT(0)
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u8 attrs;
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/*
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* Flags used during FFA_MEM_RETRIEVE_REQ and FFA_MEM_RETRIEVE_RESP
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* for memory regions with multiple borrowers.
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*/
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#define FFA_MEM_RETRIEVE_SELF_BORROWER BIT(0)
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u8 flag;
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u32 composite_off;
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/*
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* Offset in bytes from the start of the outer `ffa_memory_region` to
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* an `struct ffa_mem_region_addr_range`.
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*/
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u64 reserved;
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};
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struct ffa_mem_region {
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/* The ID of the VM/owner which originally sent the memory region */
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u16 sender_id;
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#define FFA_MEM_NORMAL BIT(5)
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#define FFA_MEM_DEVICE BIT(4)
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#define FFA_MEM_WRITE_BACK (3 << 2)
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#define FFA_MEM_NON_CACHEABLE (1 << 2)
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#define FFA_DEV_nGnRnE (0 << 2)
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#define FFA_DEV_nGnRE (1 << 2)
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#define FFA_DEV_nGRE (2 << 2)
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#define FFA_DEV_GRE (3 << 2)
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#define FFA_MEM_NON_SHAREABLE (0)
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#define FFA_MEM_OUTER_SHAREABLE (2)
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#define FFA_MEM_INNER_SHAREABLE (3)
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u8 attributes;
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u8 reserved_0;
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/*
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* Clear memory region contents after unmapping it from the sender and
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* before mapping it for any receiver.
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*/
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#define FFA_MEM_CLEAR BIT(0)
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/*
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* Whether the hypervisor may time slice the memory sharing or retrieval
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* operation.
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*/
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#define FFA_TIME_SLICE_ENABLE BIT(1)
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#define FFA_MEM_RETRIEVE_TYPE_IN_RESP (0 << 3)
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#define FFA_MEM_RETRIEVE_TYPE_SHARE (1 << 3)
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#define FFA_MEM_RETRIEVE_TYPE_LEND (2 << 3)
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#define FFA_MEM_RETRIEVE_TYPE_DONATE (3 << 3)
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#define FFA_MEM_RETRIEVE_ADDR_ALIGN_HINT BIT(9)
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#define FFA_MEM_RETRIEVE_ADDR_ALIGN(x) ((x) << 5)
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/* Flags to control behaviour of the transaction. */
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u32 flags;
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#define HANDLE_LOW_MASK GENMASK_ULL(31, 0)
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#define HANDLE_HIGH_MASK GENMASK_ULL(63, 32)
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#define HANDLE_LOW(x) ((u32)(FIELD_GET(HANDLE_LOW_MASK, (x))))
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#define HANDLE_HIGH(x) ((u32)(FIELD_GET(HANDLE_HIGH_MASK, (x))))
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#define PACK_HANDLE(l, h) \
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(FIELD_PREP(HANDLE_LOW_MASK, (l)) | FIELD_PREP(HANDLE_HIGH_MASK, (h)))
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/*
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* A globally-unique ID assigned by the hypervisor for a region
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* of memory being sent between VMs.
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*/
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u64 handle;
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/*
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* An implementation defined value associated with the receiver and the
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* memory region.
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*/
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u64 tag;
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u32 reserved_1;
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/*
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* The number of `ffa_mem_region_attributes` entries included in this
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* transaction.
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*/
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u32 ep_count;
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/*
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* An array of endpoint memory access descriptors.
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* Each one specifies a memory region offset, an endpoint and the
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* attributes with which this memory region should be mapped in that
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* endpoint's page table.
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*/
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struct ffa_mem_region_attributes ep_mem_access[];
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};
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#define COMPOSITE_OFFSET(x) \
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(offsetof(struct ffa_mem_region, ep_mem_access[x]))
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#define CONSTITUENTS_OFFSET(x) \
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(offsetof(struct ffa_composite_mem_region, constituents[x]))
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#define COMPOSITE_CONSTITUENTS_OFFSET(x, y) \
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(COMPOSITE_OFFSET(x) + CONSTITUENTS_OFFSET(y))
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struct ffa_mem_ops_args {
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bool use_txbuf;
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u32 nattrs;
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u32 flags;
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u64 tag;
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u64 g_handle;
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struct scatterlist *sg;
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struct ffa_mem_region_attributes *attrs;
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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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int (*memory_reclaim)(u64 g_handle, u32 flags);
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int (*memory_share)(struct ffa_device *dev,
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struct ffa_mem_ops_args *args);
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};
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#endif /* _LINUX_ARM_FFA_H */
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