1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2021 ARM Ltd.
6 #ifndef _LINUX_ARM_FFA_H
7 #define _LINUX_ARM_FFA_H
9 #include <linux/device.h>
10 #include <linux/module.h>
11 #include <linux/types.h>
12 #include <linux/uuid.h>
14 /* FFA Bus/Device/Driver related */
23 #define to_ffa_dev(d) container_of(d, struct ffa_device, dev)
25 struct ffa_device_id {
31 int (*probe)(struct ffa_device *sdev);
32 void (*remove)(struct ffa_device *sdev);
33 const struct ffa_device_id *id_table;
35 struct device_driver driver;
38 #define to_ffa_driver(d) container_of(d, struct ffa_driver, driver)
40 static inline void ffa_dev_set_drvdata(struct ffa_device *fdev, void *data)
42 fdev->dev.driver_data = data;
45 #if IS_REACHABLE(CONFIG_ARM_FFA_TRANSPORT)
46 struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id);
47 void ffa_device_unregister(struct ffa_device *ffa_dev);
48 int ffa_driver_register(struct ffa_driver *driver, struct module *owner,
49 const char *mod_name);
50 void ffa_driver_unregister(struct ffa_driver *driver);
51 bool ffa_device_is_valid(struct ffa_device *ffa_dev);
52 const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev);
56 struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id)
61 static inline void ffa_device_unregister(struct ffa_device *dev) {}
64 ffa_driver_register(struct ffa_driver *driver, struct module *owner,
70 static inline void ffa_driver_unregister(struct ffa_driver *driver) {}
73 bool ffa_device_is_valid(struct ffa_device *ffa_dev) { return false; }
76 const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev)
80 #endif /* CONFIG_ARM_FFA_TRANSPORT */
82 #define ffa_register(driver) \
83 ffa_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
84 #define ffa_unregister(driver) \
85 ffa_driver_unregister(driver)
88 * module_ffa_driver() - Helper macro for registering a psa_ffa driver
89 * @__ffa_driver: ffa_driver structure
91 * Helper macro for psa_ffa drivers to set up proper module init / exit
92 * functions. Replaces module_init() and module_exit() and keeps people from
93 * printing pointless things to the kernel log when their driver is loaded.
95 #define module_ffa_driver(__ffa_driver) \
96 module_driver(__ffa_driver, ffa_register, ffa_unregister)
98 /* FFA transport related */
99 struct ffa_partition_info {
102 /* partition supports receipt of direct requests */
103 #define FFA_PARTITION_DIRECT_RECV BIT(0)
104 /* partition can send direct requests. */
105 #define FFA_PARTITION_DIRECT_SEND BIT(1)
106 /* partition can send and receive indirect messages. */
107 #define FFA_PARTITION_INDIRECT_MSG BIT(2)
111 /* For use with FFA_MSG_SEND_DIRECT_{REQ,RESP} which pass data via registers */
112 struct ffa_send_direct_data {
113 unsigned long data0; /* w3/x3 */
114 unsigned long data1; /* w4/x4 */
115 unsigned long data2; /* w5/x5 */
116 unsigned long data3; /* w6/x6 */
117 unsigned long data4; /* w7/x7 */
120 struct ffa_mem_region_addr_range {
121 /* The base IPA of the constituent memory region, aligned to 4 kiB */
123 /* The number of 4 kiB pages in the constituent memory region. */
128 struct ffa_composite_mem_region {
130 * The total number of 4 kiB pages included in this memory region. This
131 * must be equal to the sum of page counts specified in each
132 * `struct ffa_mem_region_addr_range`.
135 /* The number of constituents included in this memory region range */
138 /** An array of `addr_range_cnt` memory region constituents. */
139 struct ffa_mem_region_addr_range constituents[];
142 struct ffa_mem_region_attributes {
143 /* The ID of the VM to which the memory is being given or shared. */
146 * The permissions with which the memory region should be mapped in the
147 * receiver's page table.
149 #define FFA_MEM_EXEC BIT(3)
150 #define FFA_MEM_NO_EXEC BIT(2)
151 #define FFA_MEM_RW BIT(1)
152 #define FFA_MEM_RO BIT(0)
155 * Flags used during FFA_MEM_RETRIEVE_REQ and FFA_MEM_RETRIEVE_RESP
156 * for memory regions with multiple borrowers.
158 #define FFA_MEM_RETRIEVE_SELF_BORROWER BIT(0)
162 * Offset in bytes from the start of the outer `ffa_memory_region` to
163 * an `struct ffa_mem_region_addr_range`.
168 struct ffa_mem_region {
169 /* The ID of the VM/owner which originally sent the memory region */
171 #define FFA_MEM_NORMAL BIT(5)
172 #define FFA_MEM_DEVICE BIT(4)
174 #define FFA_MEM_WRITE_BACK (3 << 2)
175 #define FFA_MEM_NON_CACHEABLE (1 << 2)
177 #define FFA_DEV_nGnRnE (0 << 2)
178 #define FFA_DEV_nGnRE (1 << 2)
179 #define FFA_DEV_nGRE (2 << 2)
180 #define FFA_DEV_GRE (3 << 2)
182 #define FFA_MEM_NON_SHAREABLE (0)
183 #define FFA_MEM_OUTER_SHAREABLE (2)
184 #define FFA_MEM_INNER_SHAREABLE (3)
188 * Clear memory region contents after unmapping it from the sender and
189 * before mapping it for any receiver.
191 #define FFA_MEM_CLEAR BIT(0)
193 * Whether the hypervisor may time slice the memory sharing or retrieval
196 #define FFA_TIME_SLICE_ENABLE BIT(1)
198 #define FFA_MEM_RETRIEVE_TYPE_IN_RESP (0 << 3)
199 #define FFA_MEM_RETRIEVE_TYPE_SHARE (1 << 3)
200 #define FFA_MEM_RETRIEVE_TYPE_LEND (2 << 3)
201 #define FFA_MEM_RETRIEVE_TYPE_DONATE (3 << 3)
203 #define FFA_MEM_RETRIEVE_ADDR_ALIGN_HINT BIT(9)
204 #define FFA_MEM_RETRIEVE_ADDR_ALIGN(x) ((x) << 5)
205 /* Flags to control behaviour of the transaction. */
207 #define HANDLE_LOW_MASK GENMASK_ULL(31, 0)
208 #define HANDLE_HIGH_MASK GENMASK_ULL(63, 32)
209 #define HANDLE_LOW(x) ((u32)(FIELD_GET(HANDLE_LOW_MASK, (x))))
210 #define HANDLE_HIGH(x) ((u32)(FIELD_GET(HANDLE_HIGH_MASK, (x))))
212 #define PACK_HANDLE(l, h) \
213 (FIELD_PREP(HANDLE_LOW_MASK, (l)) | FIELD_PREP(HANDLE_HIGH_MASK, (h)))
215 * A globally-unique ID assigned by the hypervisor for a region
216 * of memory being sent between VMs.
220 * An implementation defined value associated with the receiver and the
226 * The number of `ffa_mem_region_attributes` entries included in this
231 * An array of endpoint memory access descriptors.
232 * Each one specifies a memory region offset, an endpoint and the
233 * attributes with which this memory region should be mapped in that
234 * endpoint's page table.
236 struct ffa_mem_region_attributes ep_mem_access[];
239 #define COMPOSITE_OFFSET(x) \
240 (offsetof(struct ffa_mem_region, ep_mem_access[x]))
241 #define CONSTITUENTS_OFFSET(x) \
242 (offsetof(struct ffa_composite_mem_region, constituents[x]))
243 #define COMPOSITE_CONSTITUENTS_OFFSET(x, y) \
244 (COMPOSITE_OFFSET(x) + CONSTITUENTS_OFFSET(y))
246 struct ffa_mem_ops_args {
252 struct scatterlist *sg;
253 struct ffa_mem_region_attributes *attrs;
257 u32 (*api_version_get)(void);
258 int (*partition_info_get)(const char *uuid_str,
259 struct ffa_partition_info *buffer);
260 void (*mode_32bit_set)(struct ffa_device *dev);
261 int (*sync_send_receive)(struct ffa_device *dev,
262 struct ffa_send_direct_data *data);
263 int (*memory_reclaim)(u64 g_handle, u32 flags);
264 int (*memory_share)(struct ffa_device *dev,
265 struct ffa_mem_ops_args *args);
268 #endif /* _LINUX_ARM_FFA_H */