drivers/firmware/arm_ffa/driver.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Arm Firmware Framework for ARMv8-A(FFA) interface driver
   4  *
   5  * The Arm FFA specification[1] describes a software architecture to
   6  * leverages the virtualization extension to isolate software images
   7  * provided by an ecosystem of vendors from each other and describes
   8  * interfaces that standardize communication between the various software
   9  * images including communication between images in the Secure world and
  10  * Normal world. Any Hypervisor could use the FFA interfaces to enable
  11  * communication between VMs it manages.
  12  *
  13  * The Hypervisor a.k.a Partition managers in FFA terminology can assign
  14  * system resources(Memory regions, Devices, CPU cycles) to the partitions
  15  * and manage isolation amongst them.
  16  *
  17  * [1] https://developer.arm.com/docs/den0077/latest
  18  *
  19  * Copyright (C) 2021 ARM Ltd.
  20  */
  21
  22 #define DRIVER_NAME "ARM FF-A"
  23 #define pr_fmt(fmt) DRIVER_NAME ": " fmt
  24
  25 #include <linux/acpi.h>
  26 #include <linux/arm_ffa.h>
  27 #include <linux/bitfield.h>
  28 #include <linux/cpuhotplug.h>
  29 #include <linux/delay.h>
  30 #include <linux/device.h>
  31 #include <linux/hashtable.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/io.h>
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/mm.h>
  37 #include <linux/mutex.h>
  38 #include <linux/of_irq.h>
  39 #include <linux/scatterlist.h>
  40 #include <linux/slab.h>
  41 #include <linux/smp.h>
  42 #include <linux/uuid.h>
  43 #include <linux/xarray.h>
  44
  45 #include "common.h"
  46
  47 #define FFA_DRIVER_VERSION      FFA_VERSION_1_1
  48 #define FFA_MIN_VERSION         FFA_VERSION_1_0
  49
  50 #define SENDER_ID_MASK          GENMASK(31, 16)
  51 #define RECEIVER_ID_MASK        GENMASK(15, 0)
  52 #define SENDER_ID(x)            ((u16)(FIELD_GET(SENDER_ID_MASK, (x))))
  53 #define RECEIVER_ID(x)          ((u16)(FIELD_GET(RECEIVER_ID_MASK, (x))))
  54 #define PACK_TARGET_INFO(s, r)          \
  55         (FIELD_PREP(SENDER_ID_MASK, (s)) | FIELD_PREP(RECEIVER_ID_MASK, (r)))
  56
  57 #define RXTX_MAP_MIN_BUFSZ_MASK GENMASK(1, 0)
  58 #define RXTX_MAP_MIN_BUFSZ(x)   ((x) & RXTX_MAP_MIN_BUFSZ_MASK)
  59
  60 #define FFA_MAX_NOTIFICATIONS           64
  61
  62 static ffa_fn *invoke_ffa_fn;
  63
  64 static const int ffa_linux_errmap[] = {
  65         /* better than switch case as long as return value is continuous */
  66         0,              /* FFA_RET_SUCCESS */
  67         -EOPNOTSUPP,    /* FFA_RET_NOT_SUPPORTED */
  68         -EINVAL,        /* FFA_RET_INVALID_PARAMETERS */
  69         -ENOMEM,        /* FFA_RET_NO_MEMORY */
  70         -EBUSY,         /* FFA_RET_BUSY */
  71         -EINTR,         /* FFA_RET_INTERRUPTED */
  72         -EACCES,        /* FFA_RET_DENIED */
  73         -EAGAIN,        /* FFA_RET_RETRY */
  74         -ECANCELED,     /* FFA_RET_ABORTED */
  75         -ENODATA,       /* FFA_RET_NO_DATA */
  76         -EAGAIN,        /* FFA_RET_NOT_READY */
  77 };
  78
  79 static inline int ffa_to_linux_errno(int errno)
  80 {
  81         int err_idx = -errno;
  82
  83         if (err_idx >= 0 && err_idx < ARRAY_SIZE(ffa_linux_errmap))
  84                 return ffa_linux_errmap[err_idx];
  85         return -EINVAL;
  86 }
  87
  88 struct ffa_pcpu_irq {
  89         struct ffa_drv_info *info;
  90 };
  91
  92 struct ffa_drv_info {
  93         u32 version;
  94         u16 vm_id;
  95         struct mutex rx_lock; /* lock to protect Rx buffer */
  96         struct mutex tx_lock; /* lock to protect Tx buffer */
  97         void *rx_buffer;
  98         void *tx_buffer;
  99         size_t rxtx_bufsz;
 100         bool mem_ops_native;
 101         bool msg_direct_req2_supp;
 102         bool bitmap_created;
 103         bool notif_enabled;
 104         unsigned int sched_recv_irq;
 105         unsigned int notif_pend_irq;
 106         unsigned int cpuhp_state;
 107         struct ffa_pcpu_irq __percpu *irq_pcpu;
 108         struct workqueue_struct *notif_pcpu_wq;
 109         struct work_struct notif_pcpu_work;
 110         struct work_struct sched_recv_irq_work;
 111         struct xarray partition_info;
 112         DECLARE_HASHTABLE(notifier_hash, ilog2(FFA_MAX_NOTIFICATIONS));
 113         struct mutex notify_lock; /* lock to protect notifier hashtable  */
 114 };
 115
 116 static struct ffa_drv_info *drv_info;
 117 static void ffa_partitions_cleanup(void);
 118
 119 /*
 120  * The driver must be able to support all the versions from the earliest
 121  * supported FFA_MIN_VERSION to the latest supported FFA_DRIVER_VERSION.
 122  * The specification states that if firmware supports a FFA implementation
 123  * that is incompatible with and at a greater version number than specified
 124  * by the caller(FFA_DRIVER_VERSION passed as parameter to FFA_VERSION),
 125  * it must return the NOT_SUPPORTED error code.
 126  */
 127 static u32 ffa_compatible_version_find(u32 version)
 128 {
 129         u16 major = FFA_MAJOR_VERSION(version), minor = FFA_MINOR_VERSION(version);
 130         u16 drv_major = FFA_MAJOR_VERSION(FFA_DRIVER_VERSION);
 131         u16 drv_minor = FFA_MINOR_VERSION(FFA_DRIVER_VERSION);
 132
 133         if ((major < drv_major) || (major == drv_major && minor <= drv_minor))
 134                 return version;
 135
 136         pr_info("Firmware version higher than driver version, downgrading\n");
 137         return FFA_DRIVER_VERSION;
 138 }
 139
 140 static int ffa_version_check(u32 *version)
 141 {
 142         ffa_value_t ver;
 143
 144         invoke_ffa_fn((ffa_value_t){
 145                       .a0 = FFA_VERSION, .a1 = FFA_DRIVER_VERSION,
 146                       }, &ver);
 147
 148         if (ver.a0 == FFA_RET_NOT_SUPPORTED) {
 149                 pr_info("FFA_VERSION returned not supported\n");
 150                 return -EOPNOTSUPP;
 151         }
 152
 153         if (ver.a0 < FFA_MIN_VERSION) {
 154                 pr_err("Incompatible v%d.%d! Earliest supported v%d.%d\n",
 155                        FFA_MAJOR_VERSION(ver.a0), FFA_MINOR_VERSION(ver.a0),
 156                        FFA_MAJOR_VERSION(FFA_MIN_VERSION),
 157                        FFA_MINOR_VERSION(FFA_MIN_VERSION));
 158                 return -EINVAL;
 159         }
 160
 161         pr_info("Driver version %d.%d\n", FFA_MAJOR_VERSION(FFA_DRIVER_VERSION),
 162                 FFA_MINOR_VERSION(FFA_DRIVER_VERSION));
 163         pr_info("Firmware version %d.%d found\n", FFA_MAJOR_VERSION(ver.a0),
 164                 FFA_MINOR_VERSION(ver.a0));
 165         *version = ffa_compatible_version_find(ver.a0);
 166
 167         return 0;
 168 }
 169
 170 static int ffa_rx_release(void)
 171 {
 172         ffa_value_t ret;
 173
 174         invoke_ffa_fn((ffa_value_t){
 175                       .a0 = FFA_RX_RELEASE,
 176                       }, &ret);
 177
 178         if (ret.a0 == FFA_ERROR)
 179                 return ffa_to_linux_errno((int)ret.a2);
 180
 181         /* check for ret.a0 == FFA_RX_RELEASE ? */
 182
 183         return 0;
 184 }
 185
 186 static int ffa_rxtx_map(phys_addr_t tx_buf, phys_addr_t rx_buf, u32 pg_cnt)
 187 {
 188         ffa_value_t ret;
 189
 190         invoke_ffa_fn((ffa_value_t){
 191                       .a0 = FFA_FN_NATIVE(RXTX_MAP),
 192                       .a1 = tx_buf, .a2 = rx_buf, .a3 = pg_cnt,
 193                       }, &ret);
 194
 195         if (ret.a0 == FFA_ERROR)
 196                 return ffa_to_linux_errno((int)ret.a2);
 197
 198         return 0;
 199 }
 200
 201 static int ffa_rxtx_unmap(u16 vm_id)
 202 {
 203         ffa_value_t ret;
 204
 205         invoke_ffa_fn((ffa_value_t){
 206                       .a0 = FFA_RXTX_UNMAP, .a1 = PACK_TARGET_INFO(vm_id, 0),
 207                       }, &ret);
 208
 209         if (ret.a0 == FFA_ERROR)
 210                 return ffa_to_linux_errno((int)ret.a2);
 211
 212         return 0;
 213 }
 214
 215 static int ffa_features(u32 func_feat_id, u32 input_props,
 216                         u32 *if_props_1, u32 *if_props_2)
 217 {
 218         ffa_value_t id;
 219
 220         if (!ARM_SMCCC_IS_FAST_CALL(func_feat_id) && input_props) {
 221                 pr_err("%s: Invalid Parameters: %x, %x", __func__,
 222                        func_feat_id, input_props);
 223                 return ffa_to_linux_errno(FFA_RET_INVALID_PARAMETERS);
 224         }
 225
 226         invoke_ffa_fn((ffa_value_t){
 227                 .a0 = FFA_FEATURES, .a1 = func_feat_id, .a2 = input_props,
 228                 }, &id);
 229
 230         if (id.a0 == FFA_ERROR)
 231                 return ffa_to_linux_errno((int)id.a2);
 232
 233         if (if_props_1)
 234                 *if_props_1 = id.a2;
 235         if (if_props_2)
 236                 *if_props_2 = id.a3;
 237
 238         return 0;
 239 }
 240
 241 #define PARTITION_INFO_GET_RETURN_COUNT_ONLY    BIT(0)
 242
 243 /* buffer must be sizeof(struct ffa_partition_info) * num_partitions */
 244 static int
 245 __ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3,
 246                          struct ffa_partition_info *buffer, int num_partitions)
 247 {
 248         int idx, count, flags = 0, sz, buf_sz;
 249         ffa_value_t partition_info;
 250
 251         if (drv_info->version > FFA_VERSION_1_0 &&
 252             (!buffer || !num_partitions)) /* Just get the count for now */
 253                 flags = PARTITION_INFO_GET_RETURN_COUNT_ONLY;
 254
 255         mutex_lock(&drv_info->rx_lock);
 256         invoke_ffa_fn((ffa_value_t){
 257                       .a0 = FFA_PARTITION_INFO_GET,
 258                       .a1 = uuid0, .a2 = uuid1, .a3 = uuid2, .a4 = uuid3,
 259                       .a5 = flags,
 260                       }, &partition_info);
 261
 262         if (partition_info.a0 == FFA_ERROR) {
 263                 mutex_unlock(&drv_info->rx_lock);
 264                 return ffa_to_linux_errno((int)partition_info.a2);
 265         }
 266
 267         count = partition_info.a2;
 268
 269         if (drv_info->version > FFA_VERSION_1_0) {
 270                 buf_sz = sz = partition_info.a3;
 271                 if (sz > sizeof(*buffer))
 272                         buf_sz = sizeof(*buffer);
 273         } else {
 274                 /* FFA_VERSION_1_0 lacks size in the response */
 275                 buf_sz = sz = 8;
 276         }
 277
 278         if (buffer && count <= num_partitions)
 279                 for (idx = 0; idx < count; idx++)
 280                         memcpy(buffer + idx, drv_info->rx_buffer + idx * sz,
 281                                buf_sz);
 282
 283         ffa_rx_release();
 284
 285         mutex_unlock(&drv_info->rx_lock);
 286
 287         return count;
 288 }
 289
 290 #define LAST_INDEX_MASK         GENMASK(15, 0)
 291 #define CURRENT_INDEX_MASK      GENMASK(31, 16)
 292 #define UUID_INFO_TAG_MASK      GENMASK(47, 32)
 293 #define PARTITION_INFO_SZ_MASK  GENMASK(63, 48)
 294 #define PARTITION_COUNT(x)      ((u16)(FIELD_GET(LAST_INDEX_MASK, (x))) + 1)
 295 #define CURRENT_INDEX(x)        ((u16)(FIELD_GET(CURRENT_INDEX_MASK, (x))))
 296 #define UUID_INFO_TAG(x)        ((u16)(FIELD_GET(UUID_INFO_TAG_MASK, (x))))
 297 #define PARTITION_INFO_SZ(x)    ((u16)(FIELD_GET(PARTITION_INFO_SZ_MASK, (x))))
 298 static int
 299 __ffa_partition_info_get_regs(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3,
 300                               struct ffa_partition_info *buffer, int num_parts)
 301 {
 302         u16 buf_sz, start_idx, cur_idx, count = 0, prev_idx = 0, tag = 0;
 303         ffa_value_t partition_info;
 304
 305         do {
 306                 start_idx = prev_idx ? prev_idx + 1 : 0;
 307
 308                 invoke_ffa_fn((ffa_value_t){
 309                               .a0 = FFA_PARTITION_INFO_GET_REGS,
 310                               .a1 = (u64)uuid1 << 32 | uuid0,
 311                               .a2 = (u64)uuid3 << 32 | uuid2,
 312                               .a3 = start_idx | tag << 16,
 313                               }, &partition_info);
 314
 315                 if (partition_info.a0 == FFA_ERROR)
 316                         return ffa_to_linux_errno((int)partition_info.a2);
 317
 318                 if (!count)
 319                         count = PARTITION_COUNT(partition_info.a2);
 320                 if (!buffer || !num_parts) /* count only */
 321                         return count;
 322
 323                 cur_idx = CURRENT_INDEX(partition_info.a2);
 324                 tag = UUID_INFO_TAG(partition_info.a2);
 325                 buf_sz = PARTITION_INFO_SZ(partition_info.a2);
 326                 if (buf_sz > sizeof(*buffer))
 327                         buf_sz = sizeof(*buffer);
 328
 329                 memcpy(buffer + prev_idx * buf_sz, &partition_info.a3,
 330                        (cur_idx - start_idx + 1) * buf_sz);
 331                 prev_idx = cur_idx;
 332
 333         } while (cur_idx < (count - 1));
 334
 335         return count;
 336 }
 337
 338 /* buffer is allocated and caller must free the same if returned count > 0 */
 339 static int
 340 ffa_partition_probe(const uuid_t *uuid, struct ffa_partition_info **buffer)
 341 {
 342         int count;
 343         u32 uuid0_4[4];
 344         bool reg_mode = false;
 345         struct ffa_partition_info *pbuf;
 346
 347         if (!ffa_features(FFA_PARTITION_INFO_GET_REGS, 0, NULL, NULL))
 348                 reg_mode = true;
 349
 350         export_uuid((u8 *)uuid0_4, uuid);
 351         if (reg_mode)
 352                 count = __ffa_partition_info_get_regs(uuid0_4[0], uuid0_4[1],
 353                                                       uuid0_4[2], uuid0_4[3],
 354                                                       NULL, 0);
 355         else
 356                 count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1],
 357                                                  uuid0_4[2], uuid0_4[3],
 358                                                  NULL, 0);
 359         if (count <= 0)
 360                 return count;
 361
 362         pbuf = kcalloc(count, sizeof(*pbuf), GFP_KERNEL);
 363         if (!pbuf)
 364                 return -ENOMEM;
 365
 366         if (reg_mode)
 367                 count = __ffa_partition_info_get_regs(uuid0_4[0], uuid0_4[1],
 368                                                       uuid0_4[2], uuid0_4[3],
 369                                                       pbuf, count);
 370         else
 371                 count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1],
 372                                                  uuid0_4[2], uuid0_4[3],
 373                                                  pbuf, count);
 374         if (count <= 0)
 375                 kfree(pbuf);
 376         else
 377                 *buffer = pbuf;
 378
 379         return count;
 380 }
 381
 382 #define VM_ID_MASK      GENMASK(15, 0)
 383 static int ffa_id_get(u16 *vm_id)
 384 {
 385         ffa_value_t id;
 386
 387         invoke_ffa_fn((ffa_value_t){
 388                       .a0 = FFA_ID_GET,
 389                       }, &id);
 390
 391         if (id.a0 == FFA_ERROR)
 392                 return ffa_to_linux_errno((int)id.a2);
 393
 394         *vm_id = FIELD_GET(VM_ID_MASK, (id.a2));
 395
 396         return 0;
 397 }
 398
 399 static inline void ffa_msg_send_wait_for_completion(ffa_value_t *ret)
 400 {
 401         while (ret->a0 == FFA_INTERRUPT || ret->a0 == FFA_YIELD) {
 402                 if (ret->a0 == FFA_YIELD)
 403                         fsleep(1000);
 404
 405                 invoke_ffa_fn((ffa_value_t){
 406                               .a0 = FFA_RUN, .a1 = ret->a1,
 407                               }, ret);
 408         }
 409 }
 410
 411 static int ffa_msg_send_direct_req(u16 src_id, u16 dst_id, bool mode_32bit,
 412                                    struct ffa_send_direct_data *data)
 413 {
 414         u32 req_id, resp_id, src_dst_ids = PACK_TARGET_INFO(src_id, dst_id);
 415         ffa_value_t ret;
 416
 417         if (mode_32bit) {
 418                 req_id = FFA_MSG_SEND_DIRECT_REQ;
 419                 resp_id = FFA_MSG_SEND_DIRECT_RESP;
 420         } else {
 421                 req_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_REQ);
 422                 resp_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_RESP);
 423         }
 424
 425         invoke_ffa_fn((ffa_value_t){
 426                       .a0 = req_id, .a1 = src_dst_ids, .a2 = 0,
 427                       .a3 = data->data0, .a4 = data->data1, .a5 = data->data2,
 428                       .a6 = data->data3, .a7 = data->data4,
 429                       }, &ret);
 430
 431         ffa_msg_send_wait_for_completion(&ret);
 432
 433         if (ret.a0 == FFA_ERROR)
 434                 return ffa_to_linux_errno((int)ret.a2);
 435
 436         if (ret.a0 == resp_id) {
 437                 data->data0 = ret.a3;
 438                 data->data1 = ret.a4;
 439                 data->data2 = ret.a5;
 440                 data->data3 = ret.a6;
 441                 data->data4 = ret.a7;
 442                 return 0;
 443         }
 444
 445         return -EINVAL;
 446 }
 447
 448 static int ffa_msg_send2(u16 src_id, u16 dst_id, void *buf, size_t sz)
 449 {
 450         u32 src_dst_ids = PACK_TARGET_INFO(src_id, dst_id);
 451         struct ffa_indirect_msg_hdr *msg;
 452         ffa_value_t ret;
 453         int retval = 0;
 454
 455         if (sz > (drv_info->rxtx_bufsz - sizeof(*msg)))
 456                 return -ERANGE;
 457
 458         mutex_lock(&drv_info->tx_lock);
 459
 460         msg = drv_info->tx_buffer;
 461         msg->flags = 0;
 462         msg->res0 = 0;
 463         msg->offset = sizeof(*msg);
 464         msg->send_recv_id = src_dst_ids;
 465         msg->size = sz;
 466         memcpy((u8 *)msg + msg->offset, buf, sz);
 467
 468         /* flags = 0, sender VMID = 0 works for both physical/virtual NS */
 469         invoke_ffa_fn((ffa_value_t){
 470                       .a0 = FFA_MSG_SEND2, .a1 = 0, .a2 = 0
 471                       }, &ret);
 472
 473         if (ret.a0 == FFA_ERROR)
 474                 retval = ffa_to_linux_errno((int)ret.a2);
 475
 476         mutex_unlock(&drv_info->tx_lock);
 477         return retval;
 478 }
 479
 480 static int ffa_msg_send_direct_req2(u16 src_id, u16 dst_id, const uuid_t *uuid,
 481                                     struct ffa_send_direct_data2 *data)
 482 {
 483         u32 src_dst_ids = PACK_TARGET_INFO(src_id, dst_id);
 484         ffa_value_t ret, args = {
 485                 .a0 = FFA_MSG_SEND_DIRECT_REQ2, .a1 = src_dst_ids,
 486         };
 487
 488         export_uuid((u8 *)&args.a2, uuid);
 489         memcpy((void *)&args + offsetof(ffa_value_t, a4), data, sizeof(*data));
 490
 491         invoke_ffa_fn(args, &ret);
 492
 493         ffa_msg_send_wait_for_completion(&ret);
 494
 495         if (ret.a0 == FFA_ERROR)
 496                 return ffa_to_linux_errno((int)ret.a2);
 497
 498         if (ret.a0 == FFA_MSG_SEND_DIRECT_RESP2) {
 499                 memcpy(data, &ret.a4, sizeof(*data));
 500                 return 0;
 501         }
 502
 503         return -EINVAL;
 504 }
 505
 506 static int ffa_mem_first_frag(u32 func_id, phys_addr_t buf, u32 buf_sz,
 507                               u32 frag_len, u32 len, u64 *handle)
 508 {
 509         ffa_value_t ret;
 510
 511         invoke_ffa_fn((ffa_value_t){
 512                       .a0 = func_id, .a1 = len, .a2 = frag_len,
 513                       .a3 = buf, .a4 = buf_sz,
 514                       }, &ret);
 515
 516         while (ret.a0 == FFA_MEM_OP_PAUSE)
 517                 invoke_ffa_fn((ffa_value_t){
 518                               .a0 = FFA_MEM_OP_RESUME,
 519                               .a1 = ret.a1, .a2 = ret.a2,
 520                               }, &ret);
 521
 522         if (ret.a0 == FFA_ERROR)
 523                 return ffa_to_linux_errno((int)ret.a2);
 524
 525         if (ret.a0 == FFA_SUCCESS) {
 526                 if (handle)
 527                         *handle = PACK_HANDLE(ret.a2, ret.a3);
 528         } else if (ret.a0 == FFA_MEM_FRAG_RX) {
 529                 if (handle)
 530                         *handle = PACK_HANDLE(ret.a1, ret.a2);
 531         } else {
 532                 return -EOPNOTSUPP;
 533         }
 534
 535         return frag_len;
 536 }
 537
 538 static int ffa_mem_next_frag(u64 handle, u32 frag_len)
 539 {
 540         ffa_value_t ret;
 541
 542         invoke_ffa_fn((ffa_value_t){
 543                       .a0 = FFA_MEM_FRAG_TX,
 544                       .a1 = HANDLE_LOW(handle), .a2 = HANDLE_HIGH(handle),
 545                       .a3 = frag_len,
 546                       }, &ret);
 547
 548         while (ret.a0 == FFA_MEM_OP_PAUSE)
 549                 invoke_ffa_fn((ffa_value_t){
 550                               .a0 = FFA_MEM_OP_RESUME,
 551                               .a1 = ret.a1, .a2 = ret.a2,
 552                               }, &ret);
 553
 554         if (ret.a0 == FFA_ERROR)
 555                 return ffa_to_linux_errno((int)ret.a2);
 556
 557         if (ret.a0 == FFA_MEM_FRAG_RX)
 558                 return ret.a3;
 559         else if (ret.a0 == FFA_SUCCESS)
 560                 return 0;
 561
 562         return -EOPNOTSUPP;
 563 }
 564
 565 static int
 566 ffa_transmit_fragment(u32 func_id, phys_addr_t buf, u32 buf_sz, u32 frag_len,
 567                       u32 len, u64 *handle, bool first)
 568 {
 569         if (!first)
 570                 return ffa_mem_next_frag(*handle, frag_len);
 571
 572         return ffa_mem_first_frag(func_id, buf, buf_sz, frag_len, len, handle);
 573 }
 574
 575 static u32 ffa_get_num_pages_sg(struct scatterlist *sg)
 576 {
 577         u32 num_pages = 0;
 578
 579         do {
 580                 num_pages += sg->length / FFA_PAGE_SIZE;
 581         } while ((sg = sg_next(sg)));
 582
 583         return num_pages;
 584 }
 585
 586 static u16 ffa_memory_attributes_get(u32 func_id)
 587 {
 588         /*
 589          * For the memory lend or donate operation, if the receiver is a PE or
 590          * a proxy endpoint, the owner/sender must not specify the attributes
 591          */
 592         if (func_id == FFA_FN_NATIVE(MEM_LEND) ||
 593             func_id == FFA_MEM_LEND)
 594                 return 0;
 595
 596         return FFA_MEM_NORMAL | FFA_MEM_WRITE_BACK | FFA_MEM_INNER_SHAREABLE;
 597 }
 598
 599 static int
 600 ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize,
 601                        struct ffa_mem_ops_args *args)
 602 {
 603         int rc = 0;
 604         bool first = true;
 605         u32 composite_offset;
 606         phys_addr_t addr = 0;
 607         struct ffa_mem_region *mem_region = buffer;
 608         struct ffa_composite_mem_region *composite;
 609         struct ffa_mem_region_addr_range *constituents;
 610         struct ffa_mem_region_attributes *ep_mem_access;
 611         u32 idx, frag_len, length, buf_sz = 0, num_entries = sg_nents(args->sg);
 612
 613         mem_region->tag = args->tag;
 614         mem_region->flags = args->flags;
 615         mem_region->sender_id = drv_info->vm_id;
 616         mem_region->attributes = ffa_memory_attributes_get(func_id);
 617         ep_mem_access = buffer +
 618                         ffa_mem_desc_offset(buffer, 0, drv_info->version);
 619         composite_offset = ffa_mem_desc_offset(buffer, args->nattrs,
 620                                                drv_info->version);
 621
 622         for (idx = 0; idx < args->nattrs; idx++, ep_mem_access++) {
 623                 ep_mem_access->receiver = args->attrs[idx].receiver;
 624                 ep_mem_access->attrs = args->attrs[idx].attrs;
 625                 ep_mem_access->composite_off = composite_offset;
 626                 ep_mem_access->flag = 0;
 627                 ep_mem_access->reserved = 0;
 628         }
 629         mem_region->handle = 0;
 630         mem_region->ep_count = args->nattrs;
 631         if (drv_info->version <= FFA_VERSION_1_0) {
 632                 mem_region->ep_mem_size = 0;
 633         } else {
 634                 mem_region->ep_mem_size = sizeof(*ep_mem_access);
 635                 mem_region->ep_mem_offset = sizeof(*mem_region);
 636                 memset(mem_region->reserved, 0, 12);
 637         }
 638
 639         composite = buffer + composite_offset;
 640         composite->total_pg_cnt = ffa_get_num_pages_sg(args->sg);
 641         composite->addr_range_cnt = num_entries;
 642         composite->reserved = 0;
 643
 644         length = composite_offset + CONSTITUENTS_OFFSET(num_entries);
 645         frag_len = composite_offset + CONSTITUENTS_OFFSET(0);
 646         if (frag_len > max_fragsize)
 647                 return -ENXIO;
 648
 649         if (!args->use_txbuf) {
 650                 addr = virt_to_phys(buffer);
 651                 buf_sz = max_fragsize / FFA_PAGE_SIZE;
 652         }
 653
 654         constituents = buffer + frag_len;
 655         idx = 0;
 656         do {
 657                 if (frag_len == max_fragsize) {
 658                         rc = ffa_transmit_fragment(func_id, addr, buf_sz,
 659                                                    frag_len, length,
 660                                                    &args->g_handle, first);
 661                         if (rc < 0)
 662                                 return -ENXIO;
 663
 664                         first = false;
 665                         idx = 0;
 666                         frag_len = 0;
 667                         constituents = buffer;
 668                 }
 669
 670                 if ((void *)constituents - buffer > max_fragsize) {
 671                         pr_err("Memory Region Fragment > Tx Buffer size\n");
 672                         return -EFAULT;
 673                 }
 674
 675                 constituents->address = sg_phys(args->sg);
 676                 constituents->pg_cnt = args->sg->length / FFA_PAGE_SIZE;
 677                 constituents->reserved = 0;
 678                 constituents++;
 679                 frag_len += sizeof(struct ffa_mem_region_addr_range);
 680         } while ((args->sg = sg_next(args->sg)));
 681
 682         return ffa_transmit_fragment(func_id, addr, buf_sz, frag_len,
 683                                      length, &args->g_handle, first);
 684 }
 685
 686 static int ffa_memory_ops(u32 func_id, struct ffa_mem_ops_args *args)
 687 {
 688         int ret;
 689         void *buffer;
 690         size_t rxtx_bufsz = drv_info->rxtx_bufsz;
 691
 692         if (!args->use_txbuf) {
 693                 buffer = alloc_pages_exact(rxtx_bufsz, GFP_KERNEL);
 694                 if (!buffer)
 695                         return -ENOMEM;
 696         } else {
 697                 buffer = drv_info->tx_buffer;
 698                 mutex_lock(&drv_info->tx_lock);
 699         }
 700
 701         ret = ffa_setup_and_transmit(func_id, buffer, rxtx_bufsz, args);
 702
 703         if (args->use_txbuf)
 704                 mutex_unlock(&drv_info->tx_lock);
 705         else
 706                 free_pages_exact(buffer, rxtx_bufsz);
 707
 708         return ret < 0 ? ret : 0;
 709 }
 710
 711 static int ffa_memory_reclaim(u64 g_handle, u32 flags)
 712 {
 713         ffa_value_t ret;
 714
 715         invoke_ffa_fn((ffa_value_t){
 716                       .a0 = FFA_MEM_RECLAIM,
 717                       .a1 = HANDLE_LOW(g_handle), .a2 = HANDLE_HIGH(g_handle),
 718                       .a3 = flags,
 719                       }, &ret);
 720
 721         if (ret.a0 == FFA_ERROR)
 722                 return ffa_to_linux_errno((int)ret.a2);
 723
 724         return 0;
 725 }
 726
 727 static int ffa_notification_bitmap_create(void)
 728 {
 729         ffa_value_t ret;
 730         u16 vcpu_count = nr_cpu_ids;
 731
 732         invoke_ffa_fn((ffa_value_t){
 733                       .a0 = FFA_NOTIFICATION_BITMAP_CREATE,
 734                       .a1 = drv_info->vm_id, .a2 = vcpu_count,
 735                       }, &ret);
 736
 737         if (ret.a0 == FFA_ERROR)
 738                 return ffa_to_linux_errno((int)ret.a2);
 739
 740         return 0;
 741 }
 742
 743 static int ffa_notification_bitmap_destroy(void)
 744 {
 745         ffa_value_t ret;
 746
 747         invoke_ffa_fn((ffa_value_t){
 748                       .a0 = FFA_NOTIFICATION_BITMAP_DESTROY,
 749                       .a1 = drv_info->vm_id,
 750                       }, &ret);
 751
 752         if (ret.a0 == FFA_ERROR)
 753                 return ffa_to_linux_errno((int)ret.a2);
 754
 755         return 0;
 756 }
 757
 758 #define NOTIFICATION_LOW_MASK           GENMASK(31, 0)
 759 #define NOTIFICATION_HIGH_MASK          GENMASK(63, 32)
 760 #define NOTIFICATION_BITMAP_HIGH(x)     \
 761                 ((u32)(FIELD_GET(NOTIFICATION_HIGH_MASK, (x))))
 762 #define NOTIFICATION_BITMAP_LOW(x)      \
 763                 ((u32)(FIELD_GET(NOTIFICATION_LOW_MASK, (x))))
 764 #define PACK_NOTIFICATION_BITMAP(low, high)     \
 765         (FIELD_PREP(NOTIFICATION_LOW_MASK, (low)) | \
 766          FIELD_PREP(NOTIFICATION_HIGH_MASK, (high)))
 767
 768 #define RECEIVER_VCPU_MASK              GENMASK(31, 16)
 769 #define PACK_NOTIFICATION_GET_RECEIVER_INFO(vcpu_r, r) \
 770         (FIELD_PREP(RECEIVER_VCPU_MASK, (vcpu_r)) | \
 771          FIELD_PREP(RECEIVER_ID_MASK, (r)))
 772
 773 #define NOTIFICATION_INFO_GET_MORE_PEND_MASK    BIT(0)
 774 #define NOTIFICATION_INFO_GET_ID_COUNT          GENMASK(11, 7)
 775 #define ID_LIST_MASK_64                         GENMASK(51, 12)
 776 #define ID_LIST_MASK_32                         GENMASK(31, 12)
 777 #define MAX_IDS_64                              20
 778 #define MAX_IDS_32                              10
 779
 780 #define PER_VCPU_NOTIFICATION_FLAG              BIT(0)
 781 #define SECURE_PARTITION_BITMAP                 BIT(0)
 782 #define NON_SECURE_VM_BITMAP                    BIT(1)
 783 #define SPM_FRAMEWORK_BITMAP                    BIT(2)
 784 #define NS_HYP_FRAMEWORK_BITMAP                 BIT(3)
 785
 786 static int ffa_notification_bind_common(u16 dst_id, u64 bitmap,
 787                                         u32 flags, bool is_bind)
 788 {
 789         ffa_value_t ret;
 790         u32 func, src_dst_ids = PACK_TARGET_INFO(dst_id, drv_info->vm_id);
 791
 792         func = is_bind ? FFA_NOTIFICATION_BIND : FFA_NOTIFICATION_UNBIND;
 793
 794         invoke_ffa_fn((ffa_value_t){
 795                   .a0 = func, .a1 = src_dst_ids, .a2 = flags,
 796                   .a3 = NOTIFICATION_BITMAP_LOW(bitmap),
 797                   .a4 = NOTIFICATION_BITMAP_HIGH(bitmap),
 798                   }, &ret);
 799
 800         if (ret.a0 == FFA_ERROR)
 801                 return ffa_to_linux_errno((int)ret.a2);
 802         else if (ret.a0 != FFA_SUCCESS)
 803                 return -EINVAL;
 804
 805         return 0;
 806 }
 807
 808 static
 809 int ffa_notification_set(u16 src_id, u16 dst_id, u32 flags, u64 bitmap)
 810 {
 811         ffa_value_t ret;
 812         u32 src_dst_ids = PACK_TARGET_INFO(dst_id, src_id);
 813
 814         invoke_ffa_fn((ffa_value_t) {
 815                   .a0 = FFA_NOTIFICATION_SET, .a1 = src_dst_ids, .a2 = flags,
 816                   .a3 = NOTIFICATION_BITMAP_LOW(bitmap),
 817                   .a4 = NOTIFICATION_BITMAP_HIGH(bitmap),
 818                   }, &ret);
 819
 820         if (ret.a0 == FFA_ERROR)
 821                 return ffa_to_linux_errno((int)ret.a2);
 822         else if (ret.a0 != FFA_SUCCESS)
 823                 return -EINVAL;
 824
 825         return 0;
 826 }
 827
 828 struct ffa_notify_bitmaps {
 829         u64 sp_map;
 830         u64 vm_map;
 831         u64 arch_map;
 832 };
 833
 834 static int ffa_notification_get(u32 flags, struct ffa_notify_bitmaps *notify)
 835 {
 836         ffa_value_t ret;
 837         u16 src_id = drv_info->vm_id;
 838         u16 cpu_id = smp_processor_id();
 839         u32 rec_vcpu_ids = PACK_NOTIFICATION_GET_RECEIVER_INFO(cpu_id, src_id);
 840
 841         invoke_ffa_fn((ffa_value_t){
 842                   .a0 = FFA_NOTIFICATION_GET, .a1 = rec_vcpu_ids, .a2 = flags,
 843                   }, &ret);
 844
 845         if (ret.a0 == FFA_ERROR)
 846                 return ffa_to_linux_errno((int)ret.a2);
 847         else if (ret.a0 != FFA_SUCCESS)
 848                 return -EINVAL; /* Something else went wrong. */
 849
 850         notify->sp_map = PACK_NOTIFICATION_BITMAP(ret.a2, ret.a3);
 851         notify->vm_map = PACK_NOTIFICATION_BITMAP(ret.a4, ret.a5);
 852         notify->arch_map = PACK_NOTIFICATION_BITMAP(ret.a6, ret.a7);
 853
 854         return 0;
 855 }
 856
 857 struct ffa_dev_part_info {
 858         ffa_sched_recv_cb callback;
 859         void *cb_data;
 860         rwlock_t rw_lock;
 861 };
 862
 863 static void __do_sched_recv_cb(u16 part_id, u16 vcpu, bool is_per_vcpu)
 864 {
 865         struct ffa_dev_part_info *partition;
 866         ffa_sched_recv_cb callback;
 867         void *cb_data;
 868
 869         partition = xa_load(&drv_info->partition_info, part_id);
 870         if (!partition) {
 871                 pr_err("%s: Invalid partition ID 0x%x\n", __func__, part_id);
 872                 return;
 873         }
 874
 875         read_lock(&partition->rw_lock);
 876         callback = partition->callback;
 877         cb_data = partition->cb_data;
 878         read_unlock(&partition->rw_lock);
 879
 880         if (callback)
 881                 callback(vcpu, is_per_vcpu, cb_data);
 882 }
 883
 884 static void ffa_notification_info_get(void)
 885 {
 886         int idx, list, max_ids, lists_cnt, ids_processed, ids_count[MAX_IDS_64];
 887         bool is_64b_resp;
 888         ffa_value_t ret;
 889         u64 id_list;
 890
 891         do {
 892                 invoke_ffa_fn((ffa_value_t){
 893                           .a0 = FFA_FN_NATIVE(NOTIFICATION_INFO_GET),
 894                           }, &ret);
 895
 896                 if (ret.a0 != FFA_FN_NATIVE(SUCCESS) && ret.a0 != FFA_SUCCESS) {
 897                         if (ret.a2 != FFA_RET_NO_DATA)
 898                                 pr_err("Notification Info fetch failed: 0x%lx (0x%lx)",
 899                                        ret.a0, ret.a2);
 900                         return;
 901                 }
 902
 903                 is_64b_resp = (ret.a0 == FFA_FN64_SUCCESS);
 904
 905                 ids_processed = 0;
 906                 lists_cnt = FIELD_GET(NOTIFICATION_INFO_GET_ID_COUNT, ret.a2);
 907                 if (is_64b_resp) {
 908                         max_ids = MAX_IDS_64;
 909                         id_list = FIELD_GET(ID_LIST_MASK_64, ret.a2);
 910                 } else {
 911                         max_ids = MAX_IDS_32;
 912                         id_list = FIELD_GET(ID_LIST_MASK_32, ret.a2);
 913                 }
 914
 915                 for (idx = 0; idx < lists_cnt; idx++, id_list >>= 2)
 916                         ids_count[idx] = (id_list & 0x3) + 1;
 917
 918                 /* Process IDs */
 919                 for (list = 0; list < lists_cnt; list++) {
 920                         u16 vcpu_id, part_id, *packed_id_list = (u16 *)&ret.a3;
 921
 922                         if (ids_processed >= max_ids - 1)
 923                                 break;
 924
 925                         part_id = packed_id_list[ids_processed++];
 926
 927                         if (ids_count[list] == 1) { /* Global Notification */
 928                                 __do_sched_recv_cb(part_id, 0, false);
 929                                 continue;
 930                         }
 931
 932                         /* Per vCPU Notification */
 933                         for (idx = 0; idx < ids_count[list]; idx++) {
 934                                 if (ids_processed >= max_ids - 1)
 935                                         break;
 936
 937                                 vcpu_id = packed_id_list[ids_processed++];
 938
 939                                 __do_sched_recv_cb(part_id, vcpu_id, true);
 940                         }
 941                 }
 942         } while (ret.a2 & NOTIFICATION_INFO_GET_MORE_PEND_MASK);
 943 }
 944
 945 static int ffa_run(struct ffa_device *dev, u16 vcpu)
 946 {
 947         ffa_value_t ret;
 948         u32 target = dev->vm_id << 16 | vcpu;
 949
 950         invoke_ffa_fn((ffa_value_t){ .a0 = FFA_RUN, .a1 = target, }, &ret);
 951
 952         while (ret.a0 == FFA_INTERRUPT)
 953                 invoke_ffa_fn((ffa_value_t){ .a0 = FFA_RUN, .a1 = ret.a1, },
 954                               &ret);
 955
 956         if (ret.a0 == FFA_ERROR)
 957                 return ffa_to_linux_errno((int)ret.a2);
 958
 959         return 0;
 960 }
 961
 962 static void ffa_drvinfo_flags_init(void)
 963 {
 964         if (!ffa_features(FFA_FN_NATIVE(MEM_LEND), 0, NULL, NULL) ||
 965             !ffa_features(FFA_FN_NATIVE(MEM_SHARE), 0, NULL, NULL))
 966                 drv_info->mem_ops_native = true;
 967
 968         if (!ffa_features(FFA_MSG_SEND_DIRECT_REQ2, 0, NULL, NULL) ||
 969             !ffa_features(FFA_MSG_SEND_DIRECT_RESP2, 0, NULL, NULL))
 970                 drv_info->msg_direct_req2_supp = true;
 971 }
 972
 973 static u32 ffa_api_version_get(void)
 974 {
 975         return drv_info->version;
 976 }
 977
 978 static int ffa_partition_info_get(const char *uuid_str,
 979                                   struct ffa_partition_info *buffer)
 980 {
 981         int count;
 982         uuid_t uuid;
 983         struct ffa_partition_info *pbuf;
 984
 985         if (uuid_parse(uuid_str, &uuid)) {
 986                 pr_err("invalid uuid (%s)\n", uuid_str);
 987                 return -ENODEV;
 988         }
 989
 990         count = ffa_partition_probe(&uuid, &pbuf);
 991         if (count <= 0)
 992                 return -ENOENT;
 993
 994         memcpy(buffer, pbuf, sizeof(*pbuf) * count);
 995         kfree(pbuf);
 996         return 0;
 997 }
 998
 999 static void ffa_mode_32bit_set(struct ffa_device *dev)
1000 {
1001         dev->mode_32bit = true;
1002 }
1003
1004 static int ffa_sync_send_receive(struct ffa_device *dev,
1005                                  struct ffa_send_direct_data *data)
1006 {
1007         return ffa_msg_send_direct_req(drv_info->vm_id, dev->vm_id,
1008                                        dev->mode_32bit, data);
1009 }
1010
1011 static int ffa_indirect_msg_send(struct ffa_device *dev, void *buf, size_t sz)
1012 {
1013         return ffa_msg_send2(drv_info->vm_id, dev->vm_id, buf, sz);
1014 }
1015
1016 static int ffa_sync_send_receive2(struct ffa_device *dev, const uuid_t *uuid,
1017                                   struct ffa_send_direct_data2 *data)
1018 {
1019         if (!drv_info->msg_direct_req2_supp)
1020                 return -EOPNOTSUPP;
1021
1022         return ffa_msg_send_direct_req2(drv_info->vm_id, dev->vm_id,
1023                                         uuid, data);
1024 }
1025
1026 static int ffa_memory_share(struct ffa_mem_ops_args *args)
1027 {
1028         if (drv_info->mem_ops_native)
1029                 return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args);
1030
1031         return ffa_memory_ops(FFA_MEM_SHARE, args);
1032 }
1033
1034 static int ffa_memory_lend(struct ffa_mem_ops_args *args)
1035 {
1036         /* Note that upon a successful MEM_LEND request the caller
1037          * must ensure that the memory region specified is not accessed
1038          * until a successful MEM_RECALIM call has been made.
1039          * On systems with a hypervisor present this will been enforced,
1040          * however on systems without a hypervisor the responsibility
1041          * falls to the calling kernel driver to prevent access.
1042          */
1043         if (drv_info->mem_ops_native)
1044                 return ffa_memory_ops(FFA_FN_NATIVE(MEM_LEND), args);
1045
1046         return ffa_memory_ops(FFA_MEM_LEND, args);
1047 }
1048
1049 #define FFA_SECURE_PARTITION_ID_FLAG    BIT(15)
1050
1051 #define ffa_notifications_disabled()    (!drv_info->notif_enabled)
1052
1053 enum notify_type {
1054         NON_SECURE_VM,
1055         SECURE_PARTITION,
1056         FRAMEWORK,
1057 };
1058
1059 struct notifier_cb_info {
1060         struct hlist_node hnode;
1061         ffa_notifier_cb cb;
1062         void *cb_data;
1063         enum notify_type type;
1064 };
1065
1066 static int ffa_sched_recv_cb_update(u16 part_id, ffa_sched_recv_cb callback,
1067                                     void *cb_data, bool is_registration)
1068 {
1069         struct ffa_dev_part_info *partition;
1070         bool cb_valid;
1071
1072         if (ffa_notifications_disabled())
1073                 return -EOPNOTSUPP;
1074
1075         partition = xa_load(&drv_info->partition_info, part_id);
1076         if (!partition) {
1077                 pr_err("%s: Invalid partition ID 0x%x\n", __func__, part_id);
1078                 return -EINVAL;
1079         }
1080
1081         write_lock(&partition->rw_lock);
1082
1083         cb_valid = !!partition->callback;
1084         if (!(is_registration ^ cb_valid)) {
1085                 write_unlock(&partition->rw_lock);
1086                 return -EINVAL;
1087         }
1088
1089         partition->callback = callback;
1090         partition->cb_data = cb_data;
1091
1092         write_unlock(&partition->rw_lock);
1093         return 0;
1094 }
1095
1096 static int ffa_sched_recv_cb_register(struct ffa_device *dev,
1097                                       ffa_sched_recv_cb cb, void *cb_data)
1098 {
1099         return ffa_sched_recv_cb_update(dev->vm_id, cb, cb_data, true);
1100 }
1101
1102 static int ffa_sched_recv_cb_unregister(struct ffa_device *dev)
1103 {
1104         return ffa_sched_recv_cb_update(dev->vm_id, NULL, NULL, false);
1105 }
1106
1107 static int ffa_notification_bind(u16 dst_id, u64 bitmap, u32 flags)
1108 {
1109         return ffa_notification_bind_common(dst_id, bitmap, flags, true);
1110 }
1111
1112 static int ffa_notification_unbind(u16 dst_id, u64 bitmap)
1113 {
1114         return ffa_notification_bind_common(dst_id, bitmap, 0, false);
1115 }
1116
1117 /* Should be called while the notify_lock is taken */
1118 static struct notifier_cb_info *
1119 notifier_hash_node_get(u16 notify_id, enum notify_type type)
1120 {
1121         struct notifier_cb_info *node;
1122
1123         hash_for_each_possible(drv_info->notifier_hash, node, hnode, notify_id)
1124                 if (type == node->type)
1125                         return node;
1126
1127         return NULL;
1128 }
1129
1130 static int
1131 update_notifier_cb(int notify_id, enum notify_type type, ffa_notifier_cb cb,
1132                    void *cb_data, bool is_registration)
1133 {
1134         struct notifier_cb_info *cb_info = NULL;
1135         bool cb_found;
1136
1137         cb_info = notifier_hash_node_get(notify_id, type);
1138         cb_found = !!cb_info;
1139
1140         if (!(is_registration ^ cb_found))
1141                 return -EINVAL;
1142
1143         if (is_registration) {
1144                 cb_info = kzalloc(sizeof(*cb_info), GFP_KERNEL);
1145                 if (!cb_info)
1146                         return -ENOMEM;
1147
1148                 cb_info->type = type;
1149                 cb_info->cb = cb;
1150                 cb_info->cb_data = cb_data;
1151
1152                 hash_add(drv_info->notifier_hash, &cb_info->hnode, notify_id);
1153         } else {
1154                 hash_del(&cb_info->hnode);
1155         }
1156
1157         return 0;
1158 }
1159
1160 static enum notify_type ffa_notify_type_get(u16 vm_id)
1161 {
1162         if (vm_id & FFA_SECURE_PARTITION_ID_FLAG)
1163                 return SECURE_PARTITION;
1164         else
1165                 return NON_SECURE_VM;
1166 }
1167
1168 static int ffa_notify_relinquish(struct ffa_device *dev, int notify_id)
1169 {
1170         int rc;
1171         enum notify_type type = ffa_notify_type_get(dev->vm_id);
1172
1173         if (ffa_notifications_disabled())
1174                 return -EOPNOTSUPP;
1175
1176         if (notify_id >= FFA_MAX_NOTIFICATIONS)
1177                 return -EINVAL;
1178
1179         mutex_lock(&drv_info->notify_lock);
1180
1181         rc = update_notifier_cb(notify_id, type, NULL, NULL, false);
1182         if (rc) {
1183                 pr_err("Could not unregister notification callback\n");
1184                 mutex_unlock(&drv_info->notify_lock);
1185                 return rc;
1186         }
1187
1188         rc = ffa_notification_unbind(dev->vm_id, BIT(notify_id));
1189
1190         mutex_unlock(&drv_info->notify_lock);
1191
1192         return rc;
1193 }
1194
1195 static int ffa_notify_request(struct ffa_device *dev, bool is_per_vcpu,
1196                               ffa_notifier_cb cb, void *cb_data, int notify_id)
1197 {
1198         int rc;
1199         u32 flags = 0;
1200         enum notify_type type = ffa_notify_type_get(dev->vm_id);
1201
1202         if (ffa_notifications_disabled())
1203                 return -EOPNOTSUPP;
1204
1205         if (notify_id >= FFA_MAX_NOTIFICATIONS)
1206                 return -EINVAL;
1207
1208         mutex_lock(&drv_info->notify_lock);
1209
1210         if (is_per_vcpu)
1211                 flags = PER_VCPU_NOTIFICATION_FLAG;
1212
1213         rc = ffa_notification_bind(dev->vm_id, BIT(notify_id), flags);
1214         if (rc) {
1215                 mutex_unlock(&drv_info->notify_lock);
1216                 return rc;
1217         }
1218
1219         rc = update_notifier_cb(notify_id, type, cb, cb_data, true);
1220         if (rc) {
1221                 pr_err("Failed to register callback for %d - %d\n",
1222                        notify_id, rc);
1223                 ffa_notification_unbind(dev->vm_id, BIT(notify_id));
1224         }
1225         mutex_unlock(&drv_info->notify_lock);
1226
1227         return rc;
1228 }
1229
1230 static int ffa_notify_send(struct ffa_device *dev, int notify_id,
1231                            bool is_per_vcpu, u16 vcpu)
1232 {
1233         u32 flags = 0;
1234
1235         if (ffa_notifications_disabled())
1236                 return -EOPNOTSUPP;
1237
1238         if (is_per_vcpu)
1239                 flags |= (PER_VCPU_NOTIFICATION_FLAG | vcpu << 16);
1240
1241         return ffa_notification_set(dev->vm_id, drv_info->vm_id, flags,
1242                                     BIT(notify_id));
1243 }
1244
1245 static void handle_notif_callbacks(u64 bitmap, enum notify_type type)
1246 {
1247         int notify_id;
1248         struct notifier_cb_info *cb_info = NULL;
1249
1250         for (notify_id = 0; notify_id <= FFA_MAX_NOTIFICATIONS && bitmap;
1251              notify_id++, bitmap >>= 1) {
1252                 if (!(bitmap & 1))
1253                         continue;
1254
1255                 mutex_lock(&drv_info->notify_lock);
1256                 cb_info = notifier_hash_node_get(notify_id, type);
1257                 mutex_unlock(&drv_info->notify_lock);
1258
1259                 if (cb_info && cb_info->cb)
1260                         cb_info->cb(notify_id, cb_info->cb_data);
1261         }
1262 }
1263
1264 static void notif_get_and_handle(void *unused)
1265 {
1266         int rc;
1267         struct ffa_notify_bitmaps bitmaps;
1268
1269         rc = ffa_notification_get(SECURE_PARTITION_BITMAP |
1270                                   SPM_FRAMEWORK_BITMAP, &bitmaps);
1271         if (rc) {
1272                 pr_err("Failed to retrieve notifications with %d!\n", rc);
1273                 return;
1274         }
1275
1276         handle_notif_callbacks(bitmaps.vm_map, NON_SECURE_VM);
1277         handle_notif_callbacks(bitmaps.sp_map, SECURE_PARTITION);
1278         handle_notif_callbacks(bitmaps.arch_map, FRAMEWORK);
1279 }
1280
1281 static void
1282 ffa_self_notif_handle(u16 vcpu, bool is_per_vcpu, void *cb_data)
1283 {
1284         struct ffa_drv_info *info = cb_data;
1285
1286         if (!is_per_vcpu)
1287                 notif_get_and_handle(info);
1288         else
1289                 smp_call_function_single(vcpu, notif_get_and_handle, info, 0);
1290 }
1291
1292 static void notif_pcpu_irq_work_fn(struct work_struct *work)
1293 {
1294         struct ffa_drv_info *info = container_of(work, struct ffa_drv_info,
1295                                                  notif_pcpu_work);
1296
1297         ffa_self_notif_handle(smp_processor_id(), true, info);
1298 }
1299
1300 static const struct ffa_info_ops ffa_drv_info_ops = {
1301         .api_version_get = ffa_api_version_get,
1302         .partition_info_get = ffa_partition_info_get,
1303 };
1304
1305 static const struct ffa_msg_ops ffa_drv_msg_ops = {
1306         .mode_32bit_set = ffa_mode_32bit_set,
1307         .sync_send_receive = ffa_sync_send_receive,
1308         .indirect_send = ffa_indirect_msg_send,
1309         .sync_send_receive2 = ffa_sync_send_receive2,
1310 };
1311
1312 static const struct ffa_mem_ops ffa_drv_mem_ops = {
1313         .memory_reclaim = ffa_memory_reclaim,
1314         .memory_share = ffa_memory_share,
1315         .memory_lend = ffa_memory_lend,
1316 };
1317
1318 static const struct ffa_cpu_ops ffa_drv_cpu_ops = {
1319         .run = ffa_run,
1320 };
1321
1322 static const struct ffa_notifier_ops ffa_drv_notifier_ops = {
1323         .sched_recv_cb_register = ffa_sched_recv_cb_register,
1324         .sched_recv_cb_unregister = ffa_sched_recv_cb_unregister,
1325         .notify_request = ffa_notify_request,
1326         .notify_relinquish = ffa_notify_relinquish,
1327         .notify_send = ffa_notify_send,
1328 };
1329
1330 static const struct ffa_ops ffa_drv_ops = {
1331         .info_ops = &ffa_drv_info_ops,
1332         .msg_ops = &ffa_drv_msg_ops,
1333         .mem_ops = &ffa_drv_mem_ops,
1334         .cpu_ops = &ffa_drv_cpu_ops,
1335         .notifier_ops = &ffa_drv_notifier_ops,
1336 };
1337
1338 void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid)
1339 {
1340         int count, idx;
1341         struct ffa_partition_info *pbuf, *tpbuf;
1342
1343         count = ffa_partition_probe(uuid, &pbuf);
1344         if (count <= 0)
1345                 return;
1346
1347         for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++)
1348                 if (tpbuf->id == ffa_dev->vm_id)
1349                         uuid_copy(&ffa_dev->uuid, uuid);
1350         kfree(pbuf);
1351 }
1352
1353 static int
1354 ffa_bus_notifier(struct notifier_block *nb, unsigned long action, void *data)
1355 {
1356         struct device *dev = data;
1357         struct ffa_device *fdev = to_ffa_dev(dev);
1358
1359         if (action == BUS_NOTIFY_BIND_DRIVER) {
1360                 struct ffa_driver *ffa_drv = to_ffa_driver(dev->driver);
1361                 const struct ffa_device_id *id_table = ffa_drv->id_table;
1362
1363                 /*
1364                  * FF-A v1.1 provides UUID for each partition as part of the
1365                  * discovery API, the discovered UUID must be populated in the
1366                  * device's UUID and there is no need to workaround by copying
1367                  * the same from the driver table.
1368                  */
1369                 if (uuid_is_null(&fdev->uuid))
1370                         ffa_device_match_uuid(fdev, &id_table->uuid);
1371
1372                 return NOTIFY_OK;
1373         }
1374
1375         return NOTIFY_DONE;
1376 }
1377
1378 static struct notifier_block ffa_bus_nb = {
1379         .notifier_call = ffa_bus_notifier,
1380 };
1381
1382 static int ffa_setup_partitions(void)
1383 {
1384         int count, idx, ret;
1385         uuid_t uuid;
1386         struct ffa_device *ffa_dev;
1387         struct ffa_dev_part_info *info;
1388         struct ffa_partition_info *pbuf, *tpbuf;
1389
1390         if (drv_info->version == FFA_VERSION_1_0) {
1391                 ret = bus_register_notifier(&ffa_bus_type, &ffa_bus_nb);
1392                 if (ret)
1393                         pr_err("Failed to register FF-A bus notifiers\n");
1394         }
1395
1396         count = ffa_partition_probe(&uuid_null, &pbuf);
1397         if (count <= 0) {
1398                 pr_info("%s: No partitions found, error %d\n", __func__, count);
1399                 return -EINVAL;
1400         }
1401
1402         xa_init(&drv_info->partition_info);
1403         for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) {
1404                 import_uuid(&uuid, (u8 *)tpbuf->uuid);
1405
1406                 /* Note that if the UUID will be uuid_null, that will require
1407                  * ffa_bus_notifier() to find the UUID of this partition id
1408                  * with help of ffa_device_match_uuid(). FF-A v1.1 and above
1409                  * provides UUID here for each partition as part of the
1410                  * discovery API and the same is passed.
1411                  */
1412                 ffa_dev = ffa_device_register(&uuid, tpbuf->id, &ffa_drv_ops);
1413                 if (!ffa_dev) {
1414                         pr_err("%s: failed to register partition ID 0x%x\n",
1415                                __func__, tpbuf->id);
1416                         continue;
1417                 }
1418
1419                 ffa_dev->properties = tpbuf->properties;
1420
1421                 if (drv_info->version > FFA_VERSION_1_0 &&
1422                     !(tpbuf->properties & FFA_PARTITION_AARCH64_EXEC))
1423                         ffa_mode_32bit_set(ffa_dev);
1424
1425                 info = kzalloc(sizeof(*info), GFP_KERNEL);
1426                 if (!info) {
1427                         ffa_device_unregister(ffa_dev);
1428                         continue;
1429                 }
1430                 rwlock_init(&info->rw_lock);
1431                 ret = xa_insert(&drv_info->partition_info, tpbuf->id,
1432                                 info, GFP_KERNEL);
1433                 if (ret) {
1434                         pr_err("%s: failed to save partition ID 0x%x - ret:%d\n",
1435                                __func__, tpbuf->id, ret);
1436                         ffa_device_unregister(ffa_dev);
1437                         kfree(info);
1438                 }
1439         }
1440
1441         kfree(pbuf);
1442
1443         /* Allocate for the host */
1444         info = kzalloc(sizeof(*info), GFP_KERNEL);
1445         if (!info) {
1446                 /* Already registered devices are freed on bus_exit */
1447                 ffa_partitions_cleanup();
1448                 return -ENOMEM;
1449         }
1450
1451         rwlock_init(&info->rw_lock);
1452         ret = xa_insert(&drv_info->partition_info, drv_info->vm_id,
1453                         info, GFP_KERNEL);
1454         if (ret) {
1455                 pr_err("%s: failed to save Host partition ID 0x%x - ret:%d. Abort.\n",
1456                        __func__, drv_info->vm_id, ret);
1457                 kfree(info);
1458                 /* Already registered devices are freed on bus_exit */
1459                 ffa_partitions_cleanup();
1460         }
1461
1462         return ret;
1463 }
1464
1465 static void ffa_partitions_cleanup(void)
1466 {
1467         struct ffa_dev_part_info *info;
1468         unsigned long idx;
1469
1470         xa_for_each(&drv_info->partition_info, idx, info) {
1471                 xa_erase(&drv_info->partition_info, idx);
1472                 kfree(info);
1473         }
1474
1475         xa_destroy(&drv_info->partition_info);
1476 }
1477
1478 /* FFA FEATURE IDs */
1479 #define FFA_FEAT_NOTIFICATION_PENDING_INT       (1)
1480 #define FFA_FEAT_SCHEDULE_RECEIVER_INT          (2)
1481 #define FFA_FEAT_MANAGED_EXIT_INT               (3)
1482
1483 static irqreturn_t ffa_sched_recv_irq_handler(int irq, void *irq_data)
1484 {
1485         struct ffa_pcpu_irq *pcpu = irq_data;
1486         struct ffa_drv_info *info = pcpu->info;
1487
1488         queue_work(info->notif_pcpu_wq, &info->sched_recv_irq_work);
1489
1490         return IRQ_HANDLED;
1491 }
1492
1493 static irqreturn_t notif_pend_irq_handler(int irq, void *irq_data)
1494 {
1495         struct ffa_pcpu_irq *pcpu = irq_data;
1496         struct ffa_drv_info *info = pcpu->info;
1497
1498         queue_work_on(smp_processor_id(), info->notif_pcpu_wq,
1499                       &info->notif_pcpu_work);
1500
1501         return IRQ_HANDLED;
1502 }
1503
1504 static void ffa_sched_recv_irq_work_fn(struct work_struct *work)
1505 {
1506         ffa_notification_info_get();
1507 }
1508
1509 static int ffa_irq_map(u32 id)
1510 {
1511         char *err_str;
1512         int ret, irq, intid;
1513
1514         if (id == FFA_FEAT_NOTIFICATION_PENDING_INT)
1515                 err_str = "Notification Pending Interrupt";
1516         else if (id == FFA_FEAT_SCHEDULE_RECEIVER_INT)
1517                 err_str = "Schedule Receiver Interrupt";
1518         else
1519                 err_str = "Unknown ID";
1520
1521         /* The returned intid is assumed to be SGI donated to NS world */
1522         ret = ffa_features(id, 0, &intid, NULL);
1523         if (ret < 0) {
1524                 if (ret != -EOPNOTSUPP)
1525                         pr_err("Failed to retrieve FF-A %s %u\n", err_str, id);
1526                 return ret;
1527         }
1528
1529         if (acpi_disabled) {
1530                 struct of_phandle_args oirq = {};
1531                 struct device_node *gic;
1532
1533                 /* Only GICv3 supported currently with the device tree */
1534                 gic = of_find_compatible_node(NULL, NULL, "arm,gic-v3");
1535                 if (!gic)
1536                         return -ENXIO;
1537
1538                 oirq.np = gic;
1539                 oirq.args_count = 1;
1540                 oirq.args[0] = intid;
1541                 irq = irq_create_of_mapping(&oirq);
1542                 of_node_put(gic);
1543 #ifdef CONFIG_ACPI
1544         } else {
1545                 irq = acpi_register_gsi(NULL, intid, ACPI_EDGE_SENSITIVE,
1546                                         ACPI_ACTIVE_HIGH);
1547 #endif
1548         }
1549
1550         if (irq <= 0) {
1551                 pr_err("Failed to create IRQ mapping!\n");
1552                 return -ENODATA;
1553         }
1554
1555         return irq;
1556 }
1557
1558 static void ffa_irq_unmap(unsigned int irq)
1559 {
1560         if (!irq)
1561                 return;
1562         irq_dispose_mapping(irq);
1563 }
1564
1565 static int ffa_cpuhp_pcpu_irq_enable(unsigned int cpu)
1566 {
1567         if (drv_info->sched_recv_irq)
1568                 enable_percpu_irq(drv_info->sched_recv_irq, IRQ_TYPE_NONE);
1569         if (drv_info->notif_pend_irq)
1570                 enable_percpu_irq(drv_info->notif_pend_irq, IRQ_TYPE_NONE);
1571         return 0;
1572 }
1573
1574 static int ffa_cpuhp_pcpu_irq_disable(unsigned int cpu)
1575 {
1576         if (drv_info->sched_recv_irq)
1577                 disable_percpu_irq(drv_info->sched_recv_irq);
1578         if (drv_info->notif_pend_irq)
1579                 disable_percpu_irq(drv_info->notif_pend_irq);
1580         return 0;
1581 }
1582
1583 static void ffa_uninit_pcpu_irq(void)
1584 {
1585         if (drv_info->cpuhp_state) {
1586                 cpuhp_remove_state(drv_info->cpuhp_state);
1587                 drv_info->cpuhp_state = 0;
1588         }
1589
1590         if (drv_info->notif_pcpu_wq) {
1591                 destroy_workqueue(drv_info->notif_pcpu_wq);
1592                 drv_info->notif_pcpu_wq = NULL;
1593         }
1594
1595         if (drv_info->sched_recv_irq)
1596                 free_percpu_irq(drv_info->sched_recv_irq, drv_info->irq_pcpu);
1597
1598         if (drv_info->notif_pend_irq)
1599                 free_percpu_irq(drv_info->notif_pend_irq, drv_info->irq_pcpu);
1600
1601         if (drv_info->irq_pcpu) {
1602                 free_percpu(drv_info->irq_pcpu);
1603                 drv_info->irq_pcpu = NULL;
1604         }
1605 }
1606
1607 static int ffa_init_pcpu_irq(void)
1608 {
1609         struct ffa_pcpu_irq __percpu *irq_pcpu;
1610         int ret, cpu;
1611
1612         irq_pcpu = alloc_percpu(struct ffa_pcpu_irq);
1613         if (!irq_pcpu)
1614                 return -ENOMEM;
1615
1616         for_each_present_cpu(cpu)
1617                 per_cpu_ptr(irq_pcpu, cpu)->info = drv_info;
1618
1619         drv_info->irq_pcpu = irq_pcpu;
1620
1621         if (drv_info->sched_recv_irq) {
1622                 ret = request_percpu_irq(drv_info->sched_recv_irq,
1623                                          ffa_sched_recv_irq_handler,
1624                                          "ARM-FFA-SRI", irq_pcpu);
1625                 if (ret) {
1626                         pr_err("Error registering percpu SRI nIRQ %d : %d\n",
1627                                drv_info->sched_recv_irq, ret);
1628                         drv_info->sched_recv_irq = 0;
1629                         return ret;
1630                 }
1631         }
1632
1633         if (drv_info->notif_pend_irq) {
1634                 ret = request_percpu_irq(drv_info->notif_pend_irq,
1635                                          notif_pend_irq_handler,
1636                                          "ARM-FFA-NPI", irq_pcpu);
1637                 if (ret) {
1638                         pr_err("Error registering percpu NPI nIRQ %d : %d\n",
1639                                drv_info->notif_pend_irq, ret);
1640                         drv_info->notif_pend_irq = 0;
1641                         return ret;
1642                 }
1643         }
1644
1645         INIT_WORK(&drv_info->sched_recv_irq_work, ffa_sched_recv_irq_work_fn);
1646         INIT_WORK(&drv_info->notif_pcpu_work, notif_pcpu_irq_work_fn);
1647         drv_info->notif_pcpu_wq = create_workqueue("ffa_pcpu_irq_notification");
1648         if (!drv_info->notif_pcpu_wq)
1649                 return -EINVAL;
1650
1651         ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ffa/pcpu-irq:starting",
1652                                 ffa_cpuhp_pcpu_irq_enable,
1653                                 ffa_cpuhp_pcpu_irq_disable);
1654
1655         if (ret < 0)
1656                 return ret;
1657
1658         drv_info->cpuhp_state = ret;
1659         return 0;
1660 }
1661
1662 static void ffa_notifications_cleanup(void)
1663 {
1664         ffa_uninit_pcpu_irq();
1665         ffa_irq_unmap(drv_info->sched_recv_irq);
1666         drv_info->sched_recv_irq = 0;
1667         ffa_irq_unmap(drv_info->notif_pend_irq);
1668         drv_info->notif_pend_irq = 0;
1669
1670         if (drv_info->bitmap_created) {
1671                 ffa_notification_bitmap_destroy();
1672                 drv_info->bitmap_created = false;
1673         }
1674         drv_info->notif_enabled = false;
1675 }
1676
1677 static void ffa_notifications_setup(void)
1678 {
1679         int ret;
1680
1681         ret = ffa_features(FFA_NOTIFICATION_BITMAP_CREATE, 0, NULL, NULL);
1682         if (!ret) {
1683                 ret = ffa_notification_bitmap_create();
1684                 if (ret) {
1685                         pr_err("Notification bitmap create error %d\n", ret);
1686                         return;
1687                 }
1688
1689                 drv_info->bitmap_created = true;
1690         }
1691
1692         ret = ffa_irq_map(FFA_FEAT_SCHEDULE_RECEIVER_INT);
1693         if (ret > 0)
1694                 drv_info->sched_recv_irq = ret;
1695
1696         ret = ffa_irq_map(FFA_FEAT_NOTIFICATION_PENDING_INT);
1697         if (ret > 0)
1698                 drv_info->notif_pend_irq = ret;
1699
1700         if (!drv_info->sched_recv_irq && !drv_info->notif_pend_irq)
1701                 goto cleanup;
1702
1703         ret = ffa_init_pcpu_irq();
1704         if (ret)
1705                 goto cleanup;
1706
1707         hash_init(drv_info->notifier_hash);
1708         mutex_init(&drv_info->notify_lock);
1709
1710         drv_info->notif_enabled = true;
1711         return;
1712 cleanup:
1713         pr_info("Notification setup failed %d, not enabled\n", ret);
1714         ffa_notifications_cleanup();
1715 }
1716
1717 static int __init ffa_init(void)
1718 {
1719         int ret;
1720         u32 buf_sz;
1721         size_t rxtx_bufsz = SZ_4K;
1722
1723         ret = ffa_transport_init(&invoke_ffa_fn);
1724         if (ret)
1725                 return ret;
1726
1727         drv_info = kzalloc(sizeof(*drv_info), GFP_KERNEL);
1728         if (!drv_info)
1729                 return -ENOMEM;
1730
1731         ret = ffa_version_check(&drv_info->version);
1732         if (ret)
1733                 goto free_drv_info;
1734
1735         if (ffa_id_get(&drv_info->vm_id)) {
1736                 pr_err("failed to obtain VM id for self\n");
1737                 ret = -ENODEV;
1738                 goto free_drv_info;
1739         }
1740
1741         ret = ffa_features(FFA_FN_NATIVE(RXTX_MAP), 0, &buf_sz, NULL);
1742         if (!ret) {
1743                 if (RXTX_MAP_MIN_BUFSZ(buf_sz) == 1)
1744                         rxtx_bufsz = SZ_64K;
1745                 else if (RXTX_MAP_MIN_BUFSZ(buf_sz) == 2)
1746                         rxtx_bufsz = SZ_16K;
1747                 else
1748                         rxtx_bufsz = SZ_4K;
1749         }
1750
1751         drv_info->rxtx_bufsz = rxtx_bufsz;
1752         drv_info->rx_buffer = alloc_pages_exact(rxtx_bufsz, GFP_KERNEL);
1753         if (!drv_info->rx_buffer) {
1754                 ret = -ENOMEM;
1755                 goto free_pages;
1756         }
1757
1758         drv_info->tx_buffer = alloc_pages_exact(rxtx_bufsz, GFP_KERNEL);
1759         if (!drv_info->tx_buffer) {
1760                 ret = -ENOMEM;
1761                 goto free_pages;
1762         }
1763
1764         ret = ffa_rxtx_map(virt_to_phys(drv_info->tx_buffer),
1765                            virt_to_phys(drv_info->rx_buffer),
1766                            rxtx_bufsz / FFA_PAGE_SIZE);
1767         if (ret) {
1768                 pr_err("failed to register FFA RxTx buffers\n");
1769                 goto free_pages;
1770         }
1771
1772         mutex_init(&drv_info->rx_lock);
1773         mutex_init(&drv_info->tx_lock);
1774
1775         ffa_drvinfo_flags_init();
1776
1777         ffa_notifications_setup();
1778
1779         ret = ffa_setup_partitions();
1780         if (ret) {
1781                 pr_err("failed to setup partitions\n");
1782                 goto cleanup_notifs;
1783         }
1784
1785         ret = ffa_sched_recv_cb_update(drv_info->vm_id, ffa_self_notif_handle,
1786                                        drv_info, true);
1787         if (ret)
1788                 pr_info("Failed to register driver sched callback %d\n", ret);
1789
1790         return 0;
1791
1792 cleanup_notifs:
1793         ffa_notifications_cleanup();
1794 free_pages:
1795         if (drv_info->tx_buffer)
1796                 free_pages_exact(drv_info->tx_buffer, rxtx_bufsz);
1797         free_pages_exact(drv_info->rx_buffer, rxtx_bufsz);
1798 free_drv_info:
1799         kfree(drv_info);
1800         return ret;
1801 }
1802 module_init(ffa_init);
1803
1804 static void __exit ffa_exit(void)
1805 {
1806         ffa_notifications_cleanup();
1807         ffa_partitions_cleanup();
1808         ffa_rxtx_unmap(drv_info->vm_id);
1809         free_pages_exact(drv_info->tx_buffer, drv_info->rxtx_bufsz);
1810         free_pages_exact(drv_info->rx_buffer, drv_info->rxtx_bufsz);
1811         kfree(drv_info);
1812 }
1813 module_exit(ffa_exit);
1814
1815 MODULE_ALIAS("arm-ffa");
1816 MODULE_AUTHOR("Sudeep Holla <[email protected]>");
1817 MODULE_DESCRIPTION("Arm FF-A interface driver");
1818 MODULE_LICENSE("GPL v2");