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 #define FFA_CONSOLE_LOG                 FFA_SMC_32(0x8A)
  77 #define FFA_PARTITION_INFO_GET_REGS     FFA_SMC_64(0x8B)
  78 #define FFA_EL3_INTR_HANDLE             FFA_SMC_32(0x8C)
  79 #define FFA_MSG_SEND_DIRECT_REQ2        FFA_SMC_64(0x8D)
  80 #define FFA_MSG_SEND_DIRECT_RESP2       FFA_SMC_64(0x8E)
  81
  82 /*
  83  * For some calls it is necessary to use SMC64 to pass or return 64-bit values.
  84  * For such calls FFA_FN_NATIVE(name) will choose the appropriate
  85  * (native-width) function ID.
  86  */
  87 #ifdef CONFIG_64BIT
  88 #define FFA_FN_NATIVE(name)     FFA_FN64_##name
  89 #else
  90 #define FFA_FN_NATIVE(name)     FFA_##name
  91 #endif
  92
  93 /* FFA error codes. */
  94 #define FFA_RET_SUCCESS            (0)
  95 #define FFA_RET_NOT_SUPPORTED      (-1)
  96 #define FFA_RET_INVALID_PARAMETERS (-2)
  97 #define FFA_RET_NO_MEMORY          (-3)
  98 #define FFA_RET_BUSY               (-4)
  99 #define FFA_RET_INTERRUPTED        (-5)
 100 #define FFA_RET_DENIED             (-6)
 101 #define FFA_RET_RETRY              (-7)
 102 #define FFA_RET_ABORTED            (-8)
 103 #define FFA_RET_NO_DATA            (-9)
 104
 105 /* FFA version encoding */
 106 #define FFA_MAJOR_VERSION_MASK  GENMASK(30, 16)
 107 #define FFA_MINOR_VERSION_MASK  GENMASK(15, 0)
 108 #define FFA_MAJOR_VERSION(x)    ((u16)(FIELD_GET(FFA_MAJOR_VERSION_MASK, (x))))
 109 #define FFA_MINOR_VERSION(x)    ((u16)(FIELD_GET(FFA_MINOR_VERSION_MASK, (x))))
 110 #define FFA_PACK_VERSION_INFO(major, minor)                     \
 111         (FIELD_PREP(FFA_MAJOR_VERSION_MASK, (major)) |          \
 112          FIELD_PREP(FFA_MINOR_VERSION_MASK, (minor)))
 113 #define FFA_VERSION_1_0         FFA_PACK_VERSION_INFO(1, 0)
 114 #define FFA_VERSION_1_1         FFA_PACK_VERSION_INFO(1, 1)
 115
 116 /**
 117  * FF-A specification mentions explicitly about '4K pages'. This should
 118  * not be confused with the kernel PAGE_SIZE, which is the translation
 119  * granule kernel is configured and may be one among 4K, 16K and 64K.
 120  */
 121 #define FFA_PAGE_SIZE           SZ_4K
 122
 123 /*
 124  * Minimum buffer size/alignment encodings returned by an FFA_FEATURES
 125  * query for FFA_RXTX_MAP.
 126  */
 127 #define FFA_FEAT_RXTX_MIN_SZ_4K         0
 128 #define FFA_FEAT_RXTX_MIN_SZ_64K        1
 129 #define FFA_FEAT_RXTX_MIN_SZ_16K        2
 130
 131 /* FFA Bus/Device/Driver related */
 132 struct ffa_device {
 133         u32 id;
 134         u32 properties;
 135         int vm_id;
 136         bool mode_32bit;
 137         uuid_t uuid;
 138         struct device dev;
 139         const struct ffa_ops *ops;
 140 };
 141
 142 #define to_ffa_dev(d) container_of(d, struct ffa_device, dev)
 143
 144 struct ffa_device_id {
 145         uuid_t uuid;
 146 };
 147
 148 struct ffa_driver {
 149         const char *name;
 150         int (*probe)(struct ffa_device *sdev);
 151         void (*remove)(struct ffa_device *sdev);
 152         const struct ffa_device_id *id_table;
 153
 154         struct device_driver driver;
 155 };
 156
 157 #define to_ffa_driver(d) container_of_const(d, struct ffa_driver, driver)
 158
 159 static inline void ffa_dev_set_drvdata(struct ffa_device *fdev, void *data)
 160 {
 161         dev_set_drvdata(&fdev->dev, data);
 162 }
 163
 164 static inline void *ffa_dev_get_drvdata(struct ffa_device *fdev)
 165 {
 166         return dev_get_drvdata(&fdev->dev);
 167 }
 168
 169 #if IS_REACHABLE(CONFIG_ARM_FFA_TRANSPORT)
 170 struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id,
 171                                        const struct ffa_ops *ops);
 172 void ffa_device_unregister(struct ffa_device *ffa_dev);
 173 int ffa_driver_register(struct ffa_driver *driver, struct module *owner,
 174                         const char *mod_name);
 175 void ffa_driver_unregister(struct ffa_driver *driver);
 176 bool ffa_device_is_valid(struct ffa_device *ffa_dev);
 177
 178 #else
 179 static inline
 180 struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id,
 181                                        const struct ffa_ops *ops)
 182 {
 183         return NULL;
 184 }
 185
 186 static inline void ffa_device_unregister(struct ffa_device *dev) {}
 187
 188 static inline int
 189 ffa_driver_register(struct ffa_driver *driver, struct module *owner,
 190                     const char *mod_name)
 191 {
 192         return -EINVAL;
 193 }
 194
 195 static inline void ffa_driver_unregister(struct ffa_driver *driver) {}
 196
 197 static inline
 198 bool ffa_device_is_valid(struct ffa_device *ffa_dev) { return false; }
 199
 200 #endif /* CONFIG_ARM_FFA_TRANSPORT */
 201
 202 #define ffa_register(driver) \
 203         ffa_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
 204 #define ffa_unregister(driver) \
 205         ffa_driver_unregister(driver)
 206
 207 /**
 208  * module_ffa_driver() - Helper macro for registering a psa_ffa driver
 209  * @__ffa_driver: ffa_driver structure
 210  *
 211  * Helper macro for psa_ffa drivers to set up proper module init / exit
 212  * functions.  Replaces module_init() and module_exit() and keeps people from
 213  * printing pointless things to the kernel log when their driver is loaded.
 214  */
 215 #define module_ffa_driver(__ffa_driver) \
 216         module_driver(__ffa_driver, ffa_register, ffa_unregister)
 217
 218 extern const struct bus_type ffa_bus_type;
 219
 220 /* The FF-A 1.0 partition structure lacks the uuid[4] */
 221 #define FFA_1_0_PARTITON_INFO_SZ        (8)
 222
 223 /* FFA transport related */
 224 struct ffa_partition_info {
 225         u16 id;
 226         u16 exec_ctxt;
 227 /* partition supports receipt of direct requests */
 228 #define FFA_PARTITION_DIRECT_RECV       BIT(0)
 229 /* partition can send direct requests. */
 230 #define FFA_PARTITION_DIRECT_SEND       BIT(1)
 231 /* partition can send and receive indirect messages. */
 232 #define FFA_PARTITION_INDIRECT_MSG      BIT(2)
 233 /* partition can receive notifications */
 234 #define FFA_PARTITION_NOTIFICATION_RECV BIT(3)
 235 /* partition runs in the AArch64 execution state. */
 236 #define FFA_PARTITION_AARCH64_EXEC      BIT(8)
 237         u32 properties;
 238         u32 uuid[4];
 239 };
 240
 241 static inline
 242 bool ffa_partition_check_property(struct ffa_device *dev, u32 property)
 243 {
 244         return dev->properties & property;
 245 }
 246
 247 #define ffa_partition_supports_notify_recv(dev) \
 248         ffa_partition_check_property(dev, FFA_PARTITION_NOTIFICATION_RECV)
 249
 250 #define ffa_partition_supports_indirect_msg(dev)        \
 251         ffa_partition_check_property(dev, FFA_PARTITION_INDIRECT_MSG)
 252
 253 #define ffa_partition_supports_direct_recv(dev) \
 254         ffa_partition_check_property(dev, FFA_PARTITION_DIRECT_RECV)
 255
 256 /* For use with FFA_MSG_SEND_DIRECT_{REQ,RESP} which pass data via registers */
 257 struct ffa_send_direct_data {
 258         unsigned long data0; /* w3/x3 */
 259         unsigned long data1; /* w4/x4 */
 260         unsigned long data2; /* w5/x5 */
 261         unsigned long data3; /* w6/x6 */
 262         unsigned long data4; /* w7/x7 */
 263 };
 264
 265 struct ffa_indirect_msg_hdr {
 266         u32 flags;
 267         u32 res0;
 268         u32 offset;
 269         u32 send_recv_id;
 270         u32 size;
 271 };
 272
 273 /* For use with FFA_MSG_SEND_DIRECT_{REQ,RESP}2 which pass data via registers */
 274 struct ffa_send_direct_data2 {
 275         unsigned long data[14]; /* x4-x17 */
 276 };
 277
 278 struct ffa_mem_region_addr_range {
 279         /* The base IPA of the constituent memory region, aligned to 4 kiB */
 280         u64 address;
 281         /* The number of 4 kiB pages in the constituent memory region. */
 282         u32 pg_cnt;
 283         u32 reserved;
 284 };
 285
 286 struct ffa_composite_mem_region {
 287         /*
 288          * The total number of 4 kiB pages included in this memory region. This
 289          * must be equal to the sum of page counts specified in each
 290          * `struct ffa_mem_region_addr_range`.
 291          */
 292         u32 total_pg_cnt;
 293         /* The number of constituents included in this memory region range */
 294         u32 addr_range_cnt;
 295         u64 reserved;
 296         /** An array of `addr_range_cnt` memory region constituents. */
 297         struct ffa_mem_region_addr_range constituents[];
 298 };
 299
 300 struct ffa_mem_region_attributes {
 301         /* The ID of the VM to which the memory is being given or shared. */
 302         u16 receiver;
 303         /*
 304          * The permissions with which the memory region should be mapped in the
 305          * receiver's page table.
 306          */
 307 #define FFA_MEM_EXEC            BIT(3)
 308 #define FFA_MEM_NO_EXEC         BIT(2)
 309 #define FFA_MEM_RW              BIT(1)
 310 #define FFA_MEM_RO              BIT(0)
 311         u8 attrs;
 312         /*
 313          * Flags used during FFA_MEM_RETRIEVE_REQ and FFA_MEM_RETRIEVE_RESP
 314          * for memory regions with multiple borrowers.
 315          */
 316 #define FFA_MEM_RETRIEVE_SELF_BORROWER  BIT(0)
 317         u8 flag;
 318         /*
 319          * Offset in bytes from the start of the outer `ffa_memory_region` to
 320          * an `struct ffa_mem_region_addr_range`.
 321          */
 322         u32 composite_off;
 323         u64 reserved;
 324 };
 325
 326 struct ffa_mem_region {
 327         /* The ID of the VM/owner which originally sent the memory region */
 328         u16 sender_id;
 329 #define FFA_MEM_NORMAL          BIT(5)
 330 #define FFA_MEM_DEVICE          BIT(4)
 331
 332 #define FFA_MEM_WRITE_BACK      (3 << 2)
 333 #define FFA_MEM_NON_CACHEABLE   (1 << 2)
 334
 335 #define FFA_DEV_nGnRnE          (0 << 2)
 336 #define FFA_DEV_nGnRE           (1 << 2)
 337 #define FFA_DEV_nGRE            (2 << 2)
 338 #define FFA_DEV_GRE             (3 << 2)
 339
 340 #define FFA_MEM_NON_SHAREABLE   (0)
 341 #define FFA_MEM_OUTER_SHAREABLE (2)
 342 #define FFA_MEM_INNER_SHAREABLE (3)
 343         /* Memory region attributes, upper byte MBZ pre v1.1 */
 344         u16 attributes;
 345 /*
 346  * Clear memory region contents after unmapping it from the sender and
 347  * before mapping it for any receiver.
 348  */
 349 #define FFA_MEM_CLEAR                   BIT(0)
 350 /*
 351  * Whether the hypervisor may time slice the memory sharing or retrieval
 352  * operation.
 353  */
 354 #define FFA_TIME_SLICE_ENABLE           BIT(1)
 355
 356 #define FFA_MEM_RETRIEVE_TYPE_IN_RESP   (0 << 3)
 357 #define FFA_MEM_RETRIEVE_TYPE_SHARE     (1 << 3)
 358 #define FFA_MEM_RETRIEVE_TYPE_LEND      (2 << 3)
 359 #define FFA_MEM_RETRIEVE_TYPE_DONATE    (3 << 3)
 360
 361 #define FFA_MEM_RETRIEVE_ADDR_ALIGN_HINT        BIT(9)
 362 #define FFA_MEM_RETRIEVE_ADDR_ALIGN(x)          ((x) << 5)
 363         /* Flags to control behaviour of the transaction. */
 364         u32 flags;
 365 #define HANDLE_LOW_MASK         GENMASK_ULL(31, 0)
 366 #define HANDLE_HIGH_MASK        GENMASK_ULL(63, 32)
 367 #define HANDLE_LOW(x)           ((u32)(FIELD_GET(HANDLE_LOW_MASK, (x))))
 368 #define HANDLE_HIGH(x)          ((u32)(FIELD_GET(HANDLE_HIGH_MASK, (x))))
 369
 370 #define PACK_HANDLE(l, h)               \
 371         (FIELD_PREP(HANDLE_LOW_MASK, (l)) | FIELD_PREP(HANDLE_HIGH_MASK, (h)))
 372         /*
 373          * A globally-unique ID assigned by the hypervisor for a region
 374          * of memory being sent between VMs.
 375          */
 376         u64 handle;
 377         /*
 378          * An implementation defined value associated with the receiver and the
 379          * memory region.
 380          */
 381         u64 tag;
 382         /* Size of each endpoint memory access descriptor, MBZ pre v1.1 */
 383         u32 ep_mem_size;
 384         /*
 385          * The number of `ffa_mem_region_attributes` entries included in this
 386          * transaction.
 387          */
 388         u32 ep_count;
 389         /*
 390          * 16-byte aligned offset from the base address of this descriptor
 391          * to the first element of the endpoint memory access descriptor array
 392          * Valid only from v1.1
 393          */
 394         u32 ep_mem_offset;
 395         /* MBZ, valid only from v1.1 */
 396         u32 reserved[3];
 397 };
 398
 399 #define CONSTITUENTS_OFFSET(x)  \
 400         (offsetof(struct ffa_composite_mem_region, constituents[x]))
 401
 402 static inline u32
 403 ffa_mem_desc_offset(struct ffa_mem_region *buf, int count, u32 ffa_version)
 404 {
 405         u32 offset = count * sizeof(struct ffa_mem_region_attributes);
 406         /*
 407          * Earlier to v1.1, the endpoint memory descriptor array started at
 408          * offset 32(i.e. offset of ep_mem_offset in the current structure)
 409          */
 410         if (ffa_version <= FFA_VERSION_1_0)
 411                 offset += offsetof(struct ffa_mem_region, ep_mem_offset);
 412         else
 413                 offset += sizeof(struct ffa_mem_region);
 414
 415         return offset;
 416 }
 417
 418 struct ffa_mem_ops_args {
 419         bool use_txbuf;
 420         u32 nattrs;
 421         u32 flags;
 422         u64 tag;
 423         u64 g_handle;
 424         struct scatterlist *sg;
 425         struct ffa_mem_region_attributes *attrs;
 426 };
 427
 428 struct ffa_info_ops {
 429         u32 (*api_version_get)(void);
 430         int (*partition_info_get)(const char *uuid_str,
 431                                   struct ffa_partition_info *buffer);
 432 };
 433
 434 struct ffa_msg_ops {
 435         void (*mode_32bit_set)(struct ffa_device *dev);
 436         int (*sync_send_receive)(struct ffa_device *dev,
 437                                  struct ffa_send_direct_data *data);
 438         int (*indirect_send)(struct ffa_device *dev, void *buf, size_t sz);
 439         int (*sync_send_receive2)(struct ffa_device *dev, const uuid_t *uuid,
 440                                   struct ffa_send_direct_data2 *data);
 441 };
 442
 443 struct ffa_mem_ops {
 444         int (*memory_reclaim)(u64 g_handle, u32 flags);
 445         int (*memory_share)(struct ffa_mem_ops_args *args);
 446         int (*memory_lend)(struct ffa_mem_ops_args *args);
 447 };
 448
 449 struct ffa_cpu_ops {
 450         int (*run)(struct ffa_device *dev, u16 vcpu);
 451 };
 452
 453 typedef void (*ffa_sched_recv_cb)(u16 vcpu, bool is_per_vcpu, void *cb_data);
 454 typedef void (*ffa_notifier_cb)(int notify_id, void *cb_data);
 455
 456 struct ffa_notifier_ops {
 457         int (*sched_recv_cb_register)(struct ffa_device *dev,
 458                                       ffa_sched_recv_cb cb, void *cb_data);
 459         int (*sched_recv_cb_unregister)(struct ffa_device *dev);
 460         int (*notify_request)(struct ffa_device *dev, bool per_vcpu,
 461                               ffa_notifier_cb cb, void *cb_data, int notify_id);
 462         int (*notify_relinquish)(struct ffa_device *dev, int notify_id);
 463         int (*notify_send)(struct ffa_device *dev, int notify_id, bool per_vcpu,
 464                            u16 vcpu);
 465 };
 466
 467 struct ffa_ops {
 468         const struct ffa_info_ops *info_ops;
 469         const struct ffa_msg_ops *msg_ops;
 470         const struct ffa_mem_ops *mem_ops;
 471         const struct ffa_cpu_ops *cpu_ops;
 472         const struct ffa_notifier_ops *notifier_ops;
 473 };
 474
 475 #endif /* _LINUX_ARM_FFA_H */