include/linux/arm_ffa.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2021 ARM Ltd.
   4  */
   5
   6 #ifndef _LINUX_ARM_FFA_H
   7 #define _LINUX_ARM_FFA_H
   8
   9 #include <linux/bitfield.h>
  10 #include <linux/device.h>
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <linux/uuid.h>
  14
  15 #define FFA_SMC(calling_convention, func_num)                           \
  16         ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, (calling_convention),   \
  17                            ARM_SMCCC_OWNER_STANDARD, (func_num))
  18
  19 #define FFA_SMC_32(func_num)    FFA_SMC(ARM_SMCCC_SMC_32, (func_num))
  20 #define FFA_SMC_64(func_num)    FFA_SMC(ARM_SMCCC_SMC_64, (func_num))
  21
  22 #define FFA_ERROR                       FFA_SMC_32(0x60)
  23 #define FFA_SUCCESS                     FFA_SMC_32(0x61)
  24 #define FFA_FN64_SUCCESS                FFA_SMC_64(0x61)
  25 #define FFA_INTERRUPT                   FFA_SMC_32(0x62)
  26 #define FFA_VERSION                     FFA_SMC_32(0x63)
  27 #define FFA_FEATURES                    FFA_SMC_32(0x64)
  28 #define FFA_RX_RELEASE                  FFA_SMC_32(0x65)
  29 #define FFA_RXTX_MAP                    FFA_SMC_32(0x66)
  30 #define FFA_FN64_RXTX_MAP               FFA_SMC_64(0x66)
  31 #define FFA_RXTX_UNMAP                  FFA_SMC_32(0x67)
  32 #define FFA_PARTITION_INFO_GET          FFA_SMC_32(0x68)
  33 #define FFA_ID_GET                      FFA_SMC_32(0x69)
  34 #define FFA_MSG_POLL                    FFA_SMC_32(0x6A)
  35 #define FFA_MSG_WAIT                    FFA_SMC_32(0x6B)
  36 #define FFA_YIELD                       FFA_SMC_32(0x6C)
  37 #define FFA_RUN                         FFA_SMC_32(0x6D)
  38 #define FFA_MSG_SEND                    FFA_SMC_32(0x6E)
  39 #define FFA_MSG_SEND_DIRECT_REQ         FFA_SMC_32(0x6F)
  40 #define FFA_FN64_MSG_SEND_DIRECT_REQ    FFA_SMC_64(0x6F)
  41 #define FFA_MSG_SEND_DIRECT_RESP        FFA_SMC_32(0x70)
  42 #define FFA_FN64_MSG_SEND_DIRECT_RESP   FFA_SMC_64(0x70)
  43 #define FFA_MEM_DONATE                  FFA_SMC_32(0x71)
  44 #define FFA_FN64_MEM_DONATE             FFA_SMC_64(0x71)
  45 #define FFA_MEM_LEND                    FFA_SMC_32(0x72)
  46 #define FFA_FN64_MEM_LEND               FFA_SMC_64(0x72)
  47 #define FFA_MEM_SHARE                   FFA_SMC_32(0x73)
  48 #define FFA_FN64_MEM_SHARE              FFA_SMC_64(0x73)
  49 #define FFA_MEM_RETRIEVE_REQ            FFA_SMC_32(0x74)
  50 #define FFA_FN64_MEM_RETRIEVE_REQ       FFA_SMC_64(0x74)
  51 #define FFA_MEM_RETRIEVE_RESP           FFA_SMC_32(0x75)
  52 #define FFA_MEM_RELINQUISH              FFA_SMC_32(0x76)
  53 #define FFA_MEM_RECLAIM                 FFA_SMC_32(0x77)
  54 #define FFA_MEM_OP_PAUSE                FFA_SMC_32(0x78)
  55 #define FFA_MEM_OP_RESUME               FFA_SMC_32(0x79)
  56 #define FFA_MEM_FRAG_RX                 FFA_SMC_32(0x7A)
  57 #define FFA_MEM_FRAG_TX                 FFA_SMC_32(0x7B)
  58 #define FFA_NORMAL_WORLD_RESUME         FFA_SMC_32(0x7C)
  59 #define FFA_NOTIFICATION_BITMAP_CREATE  FFA_SMC_32(0x7D)
  60 #define FFA_NOTIFICATION_BITMAP_DESTROY FFA_SMC_32(0x7E)
  61 #define FFA_NOTIFICATION_BIND           FFA_SMC_32(0x7F)
  62 #define FFA_NOTIFICATION_UNBIND         FFA_SMC_32(0x80)
  63 #define FFA_NOTIFICATION_SET            FFA_SMC_32(0x81)
  64 #define FFA_NOTIFICATION_GET            FFA_SMC_32(0x82)
  65 #define FFA_NOTIFICATION_INFO_GET       FFA_SMC_32(0x83)
  66 #define FFA_FN64_NOTIFICATION_INFO_GET  FFA_SMC_64(0x83)
  67 #define FFA_RX_ACQUIRE                  FFA_SMC_32(0x84)
  68 #define FFA_SPM_ID_GET                  FFA_SMC_32(0x85)
  69 #define FFA_MSG_SEND2                   FFA_SMC_32(0x86)
  70 #define FFA_SECONDARY_EP_REGISTER       FFA_SMC_32(0x87)
  71 #define FFA_FN64_SECONDARY_EP_REGISTER  FFA_SMC_64(0x87)
  72 #define FFA_MEM_PERM_GET                FFA_SMC_32(0x88)
  73 #define FFA_FN64_MEM_PERM_GET           FFA_SMC_64(0x88)
  74 #define FFA_MEM_PERM_SET                FFA_SMC_32(0x89)
  75 #define FFA_FN64_MEM_PERM_SET           FFA_SMC_64(0x89)
  76
  77 /*
  78  * For some calls it is necessary to use SMC64 to pass or return 64-bit values.
  79  * For such calls FFA_FN_NATIVE(name) will choose the appropriate
  80  * (native-width) function ID.
  81  */
  82 #ifdef CONFIG_64BIT
  83 #define FFA_FN_NATIVE(name)     FFA_FN64_##name
  84 #else
  85 #define FFA_FN_NATIVE(name)     FFA_##name
  86 #endif
  87
  88 /* FFA error codes. */
  89 #define FFA_RET_SUCCESS            (0)
  90 #define FFA_RET_NOT_SUPPORTED      (-1)
  91 #define FFA_RET_INVALID_PARAMETERS (-2)
  92 #define FFA_RET_NO_MEMORY          (-3)
  93 #define FFA_RET_BUSY               (-4)
  94 #define FFA_RET_INTERRUPTED        (-5)
  95 #define FFA_RET_DENIED             (-6)
  96 #define FFA_RET_RETRY              (-7)
  97 #define FFA_RET_ABORTED            (-8)
  98 #define FFA_RET_NO_DATA            (-9)
  99
 100 /* FFA version encoding */
 101 #define FFA_MAJOR_VERSION_MASK  GENMASK(30, 16)
 102 #define FFA_MINOR_VERSION_MASK  GENMASK(15, 0)
 103 #define FFA_MAJOR_VERSION(x)    ((u16)(FIELD_GET(FFA_MAJOR_VERSION_MASK, (x))))
 104 #define FFA_MINOR_VERSION(x)    ((u16)(FIELD_GET(FFA_MINOR_VERSION_MASK, (x))))
 105 #define FFA_PACK_VERSION_INFO(major, minor)                     \
 106         (FIELD_PREP(FFA_MAJOR_VERSION_MASK, (major)) |          \
 107          FIELD_PREP(FFA_MINOR_VERSION_MASK, (minor)))
 108 #define FFA_VERSION_1_0         FFA_PACK_VERSION_INFO(1, 0)
 109 #define FFA_VERSION_1_1         FFA_PACK_VERSION_INFO(1, 1)
 110
 111 /**
 112  * FF-A specification mentions explicitly about '4K pages'. This should
 113  * not be confused with the kernel PAGE_SIZE, which is the translation
 114  * granule kernel is configured and may be one among 4K, 16K and 64K.
 115  */
 116 #define FFA_PAGE_SIZE           SZ_4K
 117
 118 /*
 119  * Minimum buffer size/alignment encodings returned by an FFA_FEATURES
 120  * query for FFA_RXTX_MAP.
 121  */
 122 #define FFA_FEAT_RXTX_MIN_SZ_4K         0
 123 #define FFA_FEAT_RXTX_MIN_SZ_64K        1
 124 #define FFA_FEAT_RXTX_MIN_SZ_16K        2
 125
 126 /* FFA Bus/Device/Driver related */
 127 struct ffa_device {
 128         u32 id;
 129         int vm_id;
 130         bool mode_32bit;
 131         uuid_t uuid;
 132         struct device dev;
 133         const struct ffa_ops *ops;
 134 };
 135
 136 #define to_ffa_dev(d) container_of(d, struct ffa_device, dev)
 137
 138 struct ffa_device_id {
 139         uuid_t uuid;
 140 };
 141
 142 struct ffa_driver {
 143         const char *name;
 144         int (*probe)(struct ffa_device *sdev);
 145         void (*remove)(struct ffa_device *sdev);
 146         const struct ffa_device_id *id_table;
 147
 148         struct device_driver driver;
 149 };
 150
 151 #define to_ffa_driver(d) container_of(d, struct ffa_driver, driver)
 152
 153 static inline void ffa_dev_set_drvdata(struct ffa_device *fdev, void *data)
 154 {
 155         dev_set_drvdata(&fdev->dev, data);
 156 }
 157
 158 static inline void *ffa_dev_get_drvdata(struct ffa_device *fdev)
 159 {
 160         return dev_get_drvdata(&fdev->dev);
 161 }
 162
 163 #if IS_REACHABLE(CONFIG_ARM_FFA_TRANSPORT)
 164 struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id,
 165                                        const struct ffa_ops *ops);
 166 void ffa_device_unregister(struct ffa_device *ffa_dev);
 167 int ffa_driver_register(struct ffa_driver *driver, struct module *owner,
 168                         const char *mod_name);
 169 void ffa_driver_unregister(struct ffa_driver *driver);
 170 bool ffa_device_is_valid(struct ffa_device *ffa_dev);
 171
 172 #else
 173 static inline
 174 struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id,
 175                                        const struct ffa_ops *ops)
 176 {
 177         return NULL;
 178 }
 179
 180 static inline void ffa_device_unregister(struct ffa_device *dev) {}
 181
 182 static inline int
 183 ffa_driver_register(struct ffa_driver *driver, struct module *owner,
 184                     const char *mod_name)
 185 {
 186         return -EINVAL;
 187 }
 188
 189 static inline void ffa_driver_unregister(struct ffa_driver *driver) {}
 190
 191 static inline
 192 bool ffa_device_is_valid(struct ffa_device *ffa_dev) { return false; }
 193
 194 #endif /* CONFIG_ARM_FFA_TRANSPORT */
 195
 196 #define ffa_register(driver) \
 197         ffa_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
 198 #define ffa_unregister(driver) \
 199         ffa_driver_unregister(driver)
 200
 201 /**
 202  * module_ffa_driver() - Helper macro for registering a psa_ffa driver
 203  * @__ffa_driver: ffa_driver structure
 204  *
 205  * Helper macro for psa_ffa drivers to set up proper module init / exit
 206  * functions.  Replaces module_init() and module_exit() and keeps people from
 207  * printing pointless things to the kernel log when their driver is loaded.
 208  */
 209 #define module_ffa_driver(__ffa_driver) \
 210         module_driver(__ffa_driver, ffa_register, ffa_unregister)
 211
 212 extern struct bus_type ffa_bus_type;
 213
 214 /* FFA transport related */
 215 struct ffa_partition_info {
 216         u16 id;
 217         u16 exec_ctxt;
 218 /* partition supports receipt of direct requests */
 219 #define FFA_PARTITION_DIRECT_RECV       BIT(0)
 220 /* partition can send direct requests. */
 221 #define FFA_PARTITION_DIRECT_SEND       BIT(1)
 222 /* partition can send and receive indirect messages. */
 223 #define FFA_PARTITION_INDIRECT_MSG      BIT(2)
 224 /* partition runs in the AArch64 execution state. */
 225 #define FFA_PARTITION_AARCH64_EXEC      BIT(8)
 226         u32 properties;
 227         u32 uuid[4];
 228 };
 229
 230 /* For use with FFA_MSG_SEND_DIRECT_{REQ,RESP} which pass data via registers */
 231 struct ffa_send_direct_data {
 232         unsigned long data0; /* w3/x3 */
 233         unsigned long data1; /* w4/x4 */
 234         unsigned long data2; /* w5/x5 */
 235         unsigned long data3; /* w6/x6 */
 236         unsigned long data4; /* w7/x7 */
 237 };
 238
 239 struct ffa_mem_region_addr_range {
 240         /* The base IPA of the constituent memory region, aligned to 4 kiB */
 241         u64 address;
 242         /* The number of 4 kiB pages in the constituent memory region. */
 243         u32 pg_cnt;
 244         u32 reserved;
 245 };
 246
 247 struct ffa_composite_mem_region {
 248         /*
 249          * The total number of 4 kiB pages included in this memory region. This
 250          * must be equal to the sum of page counts specified in each
 251          * `struct ffa_mem_region_addr_range`.
 252          */
 253         u32 total_pg_cnt;
 254         /* The number of constituents included in this memory region range */
 255         u32 addr_range_cnt;
 256         u64 reserved;
 257         /** An array of `addr_range_cnt` memory region constituents. */
 258         struct ffa_mem_region_addr_range constituents[];
 259 };
 260
 261 struct ffa_mem_region_attributes {
 262         /* The ID of the VM to which the memory is being given or shared. */
 263         u16 receiver;
 264         /*
 265          * The permissions with which the memory region should be mapped in the
 266          * receiver's page table.
 267          */
 268 #define FFA_MEM_EXEC            BIT(3)
 269 #define FFA_MEM_NO_EXEC         BIT(2)
 270 #define FFA_MEM_RW              BIT(1)
 271 #define FFA_MEM_RO              BIT(0)
 272         u8 attrs;
 273         /*
 274          * Flags used during FFA_MEM_RETRIEVE_REQ and FFA_MEM_RETRIEVE_RESP
 275          * for memory regions with multiple borrowers.
 276          */
 277 #define FFA_MEM_RETRIEVE_SELF_BORROWER  BIT(0)
 278         u8 flag;
 279         /*
 280          * Offset in bytes from the start of the outer `ffa_memory_region` to
 281          * an `struct ffa_mem_region_addr_range`.
 282          */
 283         u32 composite_off;
 284         u64 reserved;
 285 };
 286
 287 struct ffa_mem_region {
 288         /* The ID of the VM/owner which originally sent the memory region */
 289         u16 sender_id;
 290 #define FFA_MEM_NORMAL          BIT(5)
 291 #define FFA_MEM_DEVICE          BIT(4)
 292
 293 #define FFA_MEM_WRITE_BACK      (3 << 2)
 294 #define FFA_MEM_NON_CACHEABLE   (1 << 2)
 295
 296 #define FFA_DEV_nGnRnE          (0 << 2)
 297 #define FFA_DEV_nGnRE           (1 << 2)
 298 #define FFA_DEV_nGRE            (2 << 2)
 299 #define FFA_DEV_GRE             (3 << 2)
 300
 301 #define FFA_MEM_NON_SHAREABLE   (0)
 302 #define FFA_MEM_OUTER_SHAREABLE (2)
 303 #define FFA_MEM_INNER_SHAREABLE (3)
 304         /* Memory region attributes, upper byte MBZ pre v1.1 */
 305         u16 attributes;
 306 /*
 307  * Clear memory region contents after unmapping it from the sender and
 308  * before mapping it for any receiver.
 309  */
 310 #define FFA_MEM_CLEAR                   BIT(0)
 311 /*
 312  * Whether the hypervisor may time slice the memory sharing or retrieval
 313  * operation.
 314  */
 315 #define FFA_TIME_SLICE_ENABLE           BIT(1)
 316
 317 #define FFA_MEM_RETRIEVE_TYPE_IN_RESP   (0 << 3)
 318 #define FFA_MEM_RETRIEVE_TYPE_SHARE     (1 << 3)
 319 #define FFA_MEM_RETRIEVE_TYPE_LEND      (2 << 3)
 320 #define FFA_MEM_RETRIEVE_TYPE_DONATE    (3 << 3)
 321
 322 #define FFA_MEM_RETRIEVE_ADDR_ALIGN_HINT        BIT(9)
 323 #define FFA_MEM_RETRIEVE_ADDR_ALIGN(x)          ((x) << 5)
 324         /* Flags to control behaviour of the transaction. */
 325         u32 flags;
 326 #define HANDLE_LOW_MASK         GENMASK_ULL(31, 0)
 327 #define HANDLE_HIGH_MASK        GENMASK_ULL(63, 32)
 328 #define HANDLE_LOW(x)           ((u32)(FIELD_GET(HANDLE_LOW_MASK, (x))))
 329 #define HANDLE_HIGH(x)          ((u32)(FIELD_GET(HANDLE_HIGH_MASK, (x))))
 330
 331 #define PACK_HANDLE(l, h)               \
 332         (FIELD_PREP(HANDLE_LOW_MASK, (l)) | FIELD_PREP(HANDLE_HIGH_MASK, (h)))
 333         /*
 334          * A globally-unique ID assigned by the hypervisor for a region
 335          * of memory being sent between VMs.
 336          */
 337         u64 handle;
 338         /*
 339          * An implementation defined value associated with the receiver and the
 340          * memory region.
 341          */
 342         u64 tag;
 343         /* Size of each endpoint memory access descriptor, MBZ pre v1.1 */
 344         u32 ep_mem_size;
 345         /*
 346          * The number of `ffa_mem_region_attributes` entries included in this
 347          * transaction.
 348          */
 349         u32 ep_count;
 350         /*
 351          * 16-byte aligned offset from the base address of this descriptor
 352          * to the first element of the endpoint memory access descriptor array
 353          * Valid only from v1.1
 354          */
 355         u32 ep_mem_offset;
 356         /* MBZ, valid only from v1.1 */
 357         u32 reserved[3];
 358 };
 359
 360 #define CONSTITUENTS_OFFSET(x)  \
 361         (offsetof(struct ffa_composite_mem_region, constituents[x]))
 362
 363 static inline u32
 364 ffa_mem_desc_offset(struct ffa_mem_region *buf, int count, u32 ffa_version)
 365 {
 366         u32 offset = count * sizeof(struct ffa_mem_region_attributes);
 367         /*
 368          * Earlier to v1.1, the endpoint memory descriptor array started at
 369          * offset 32(i.e. offset of ep_mem_offset in the current structure)
 370          */
 371         if (ffa_version <= FFA_VERSION_1_0)
 372                 offset += offsetof(struct ffa_mem_region, ep_mem_offset);
 373         else
 374                 offset += sizeof(struct ffa_mem_region);
 375
 376         return offset;
 377 }
 378
 379 struct ffa_mem_ops_args {
 380         bool use_txbuf;
 381         u32 nattrs;
 382         u32 flags;
 383         u64 tag;
 384         u64 g_handle;
 385         struct scatterlist *sg;
 386         struct ffa_mem_region_attributes *attrs;
 387 };
 388
 389 struct ffa_info_ops {
 390         u32 (*api_version_get)(void);
 391         int (*partition_info_get)(const char *uuid_str,
 392                                   struct ffa_partition_info *buffer);
 393 };
 394
 395 struct ffa_msg_ops {
 396         void (*mode_32bit_set)(struct ffa_device *dev);
 397         int (*sync_send_receive)(struct ffa_device *dev,
 398                                  struct ffa_send_direct_data *data);
 399 };
 400
 401 struct ffa_mem_ops {
 402         int (*memory_reclaim)(u64 g_handle, u32 flags);
 403         int (*memory_share)(struct ffa_mem_ops_args *args);
 404         int (*memory_lend)(struct ffa_mem_ops_args *args);
 405 };
 406
 407 struct ffa_cpu_ops {
 408         int (*run)(struct ffa_device *dev, u16 vcpu);
 409 };
 410
 411 typedef void (*ffa_sched_recv_cb)(u16 vcpu, bool is_per_vcpu, void *cb_data);
 412 typedef void (*ffa_notifier_cb)(int notify_id, void *cb_data);
 413
 414 struct ffa_notifier_ops {
 415         int (*sched_recv_cb_register)(struct ffa_device *dev,
 416                                       ffa_sched_recv_cb cb, void *cb_data);
 417         int (*sched_recv_cb_unregister)(struct ffa_device *dev);
 418         int (*notify_request)(struct ffa_device *dev, bool per_vcpu,
 419                               ffa_notifier_cb cb, void *cb_data, int notify_id);
 420         int (*notify_relinquish)(struct ffa_device *dev, int notify_id);
 421         int (*notify_send)(struct ffa_device *dev, int notify_id, bool per_vcpu,
 422                            u16 vcpu);
 423 };
 424
 425 struct ffa_ops {
 426         const struct ffa_info_ops *info_ops;
 427         const struct ffa_msg_ops *msg_ops;
 428         const struct ffa_mem_ops *mem_ops;
 429         const struct ffa_cpu_ops *cpu_ops;
 430         const struct ffa_notifier_ops *notifier_ops;
 431 };
 432
 433 #endif /* _LINUX_ARM_FFA_H */