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         union {
 485                 uuid_t uuid;
 486                 __le64 regs[2];
 487         } uuid_regs = { .uuid = *uuid };
 488         ffa_value_t ret, args = {
 489                 .a0 = FFA_MSG_SEND_DIRECT_REQ2,
 490                 .a1 = src_dst_ids,
 491                 .a2 = le64_to_cpu(uuid_regs.regs[0]),
 492                 .a3 = le64_to_cpu(uuid_regs.regs[1]),
 493         };
 494         memcpy((void *)&args + offsetof(ffa_value_t, a4), data, sizeof(*data));
 495
 496         invoke_ffa_fn(args, &ret);
 497
 498         ffa_msg_send_wait_for_completion(&ret);
 499
 500         if (ret.a0 == FFA_ERROR)
 501                 return ffa_to_linux_errno((int)ret.a2);
 502
 503         if (ret.a0 == FFA_MSG_SEND_DIRECT_RESP2) {
 504                 memcpy(data, (void *)&ret + offsetof(ffa_value_t, a4), sizeof(*data));
 505                 return 0;
 506         }
 507
 508         return -EINVAL;
 509 }
 510
 511 static int ffa_mem_first_frag(u32 func_id, phys_addr_t buf, u32 buf_sz,
 512                               u32 frag_len, u32 len, u64 *handle)
 513 {
 514         ffa_value_t ret;
 515
 516         invoke_ffa_fn((ffa_value_t){
 517                       .a0 = func_id, .a1 = len, .a2 = frag_len,
 518                       .a3 = buf, .a4 = buf_sz,
 519                       }, &ret);
 520
 521         while (ret.a0 == FFA_MEM_OP_PAUSE)
 522                 invoke_ffa_fn((ffa_value_t){
 523                               .a0 = FFA_MEM_OP_RESUME,
 524                               .a1 = ret.a1, .a2 = ret.a2,
 525                               }, &ret);
 526
 527         if (ret.a0 == FFA_ERROR)
 528                 return ffa_to_linux_errno((int)ret.a2);
 529
 530         if (ret.a0 == FFA_SUCCESS) {
 531                 if (handle)
 532                         *handle = PACK_HANDLE(ret.a2, ret.a3);
 533         } else if (ret.a0 == FFA_MEM_FRAG_RX) {
 534                 if (handle)
 535                         *handle = PACK_HANDLE(ret.a1, ret.a2);
 536         } else {
 537                 return -EOPNOTSUPP;
 538         }
 539
 540         return frag_len;
 541 }
 542
 543 static int ffa_mem_next_frag(u64 handle, u32 frag_len)
 544 {
 545         ffa_value_t ret;
 546
 547         invoke_ffa_fn((ffa_value_t){
 548                       .a0 = FFA_MEM_FRAG_TX,
 549                       .a1 = HANDLE_LOW(handle), .a2 = HANDLE_HIGH(handle),
 550                       .a3 = frag_len,
 551                       }, &ret);
 552
 553         while (ret.a0 == FFA_MEM_OP_PAUSE)
 554                 invoke_ffa_fn((ffa_value_t){
 555                               .a0 = FFA_MEM_OP_RESUME,
 556                               .a1 = ret.a1, .a2 = ret.a2,
 557                               }, &ret);
 558
 559         if (ret.a0 == FFA_ERROR)
 560                 return ffa_to_linux_errno((int)ret.a2);
 561
 562         if (ret.a0 == FFA_MEM_FRAG_RX)
 563                 return ret.a3;
 564         else if (ret.a0 == FFA_SUCCESS)
 565                 return 0;
 566
 567         return -EOPNOTSUPP;
 568 }
 569
 570 static int
 571 ffa_transmit_fragment(u32 func_id, phys_addr_t buf, u32 buf_sz, u32 frag_len,
 572                       u32 len, u64 *handle, bool first)
 573 {
 574         if (!first)
 575                 return ffa_mem_next_frag(*handle, frag_len);
 576
 577         return ffa_mem_first_frag(func_id, buf, buf_sz, frag_len, len, handle);
 578 }
 579
 580 static u32 ffa_get_num_pages_sg(struct scatterlist *sg)
 581 {
 582         u32 num_pages = 0;
 583
 584         do {
 585                 num_pages += sg->length / FFA_PAGE_SIZE;
 586         } while ((sg = sg_next(sg)));
 587
 588         return num_pages;
 589 }
 590
 591 static u16 ffa_memory_attributes_get(u32 func_id)
 592 {
 593         /*
 594          * For the memory lend or donate operation, if the receiver is a PE or
 595          * a proxy endpoint, the owner/sender must not specify the attributes
 596          */
 597         if (func_id == FFA_FN_NATIVE(MEM_LEND) ||
 598             func_id == FFA_MEM_LEND)
 599                 return 0;
 600
 601         return FFA_MEM_NORMAL | FFA_MEM_WRITE_BACK | FFA_MEM_INNER_SHAREABLE;
 602 }
 603
 604 static int
 605 ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize,
 606                        struct ffa_mem_ops_args *args)
 607 {
 608         int rc = 0;
 609         bool first = true;
 610         u32 composite_offset;
 611         phys_addr_t addr = 0;
 612         struct ffa_mem_region *mem_region = buffer;
 613         struct ffa_composite_mem_region *composite;
 614         struct ffa_mem_region_addr_range *constituents;
 615         struct ffa_mem_region_attributes *ep_mem_access;
 616         u32 idx, frag_len, length, buf_sz = 0, num_entries = sg_nents(args->sg);
 617
 618         mem_region->tag = args->tag;
 619         mem_region->flags = args->flags;
 620         mem_region->sender_id = drv_info->vm_id;
 621         mem_region->attributes = ffa_memory_attributes_get(func_id);
 622         ep_mem_access = buffer +
 623                         ffa_mem_desc_offset(buffer, 0, drv_info->version);
 624         composite_offset = ffa_mem_desc_offset(buffer, args->nattrs,
 625                                                drv_info->version);
 626
 627         for (idx = 0; idx < args->nattrs; idx++, ep_mem_access++) {
 628                 ep_mem_access->receiver = args->attrs[idx].receiver;
 629                 ep_mem_access->attrs = args->attrs[idx].attrs;
 630                 ep_mem_access->composite_off = composite_offset;
 631                 ep_mem_access->flag = 0;
 632                 ep_mem_access->reserved = 0;
 633         }
 634         mem_region->handle = 0;
 635         mem_region->ep_count = args->nattrs;
 636         if (drv_info->version <= FFA_VERSION_1_0) {
 637                 mem_region->ep_mem_size = 0;
 638         } else {
 639                 mem_region->ep_mem_size = sizeof(*ep_mem_access);
 640                 mem_region->ep_mem_offset = sizeof(*mem_region);
 641                 memset(mem_region->reserved, 0, 12);
 642         }
 643
 644         composite = buffer + composite_offset;
 645         composite->total_pg_cnt = ffa_get_num_pages_sg(args->sg);
 646         composite->addr_range_cnt = num_entries;
 647         composite->reserved = 0;
 648
 649         length = composite_offset + CONSTITUENTS_OFFSET(num_entries);
 650         frag_len = composite_offset + CONSTITUENTS_OFFSET(0);
 651         if (frag_len > max_fragsize)
 652                 return -ENXIO;
 653
 654         if (!args->use_txbuf) {
 655                 addr = virt_to_phys(buffer);
 656                 buf_sz = max_fragsize / FFA_PAGE_SIZE;
 657         }
 658
 659         constituents = buffer + frag_len;
 660         idx = 0;
 661         do {
 662                 if (frag_len == max_fragsize) {
 663                         rc = ffa_transmit_fragment(func_id, addr, buf_sz,
 664                                                    frag_len, length,
 665                                                    &args->g_handle, first);
 666                         if (rc < 0)
 667                                 return -ENXIO;
 668
 669                         first = false;
 670                         idx = 0;
 671                         frag_len = 0;
 672                         constituents = buffer;
 673                 }
 674
 675                 if ((void *)constituents - buffer > max_fragsize) {
 676                         pr_err("Memory Region Fragment > Tx Buffer size\n");
 677                         return -EFAULT;
 678                 }
 679
 680                 constituents->address = sg_phys(args->sg);
 681                 constituents->pg_cnt = args->sg->length / FFA_PAGE_SIZE;
 682                 constituents->reserved = 0;
 683                 constituents++;
 684                 frag_len += sizeof(struct ffa_mem_region_addr_range);
 685         } while ((args->sg = sg_next(args->sg)));
 686
 687         return ffa_transmit_fragment(func_id, addr, buf_sz, frag_len,
 688                                      length, &args->g_handle, first);
 689 }
 690
 691 static int ffa_memory_ops(u32 func_id, struct ffa_mem_ops_args *args)
 692 {
 693         int ret;
 694         void *buffer;
 695         size_t rxtx_bufsz = drv_info->rxtx_bufsz;
 696
 697         if (!args->use_txbuf) {
 698                 buffer = alloc_pages_exact(rxtx_bufsz, GFP_KERNEL);
 699                 if (!buffer)
 700                         return -ENOMEM;
 701         } else {
 702                 buffer = drv_info->tx_buffer;
 703                 mutex_lock(&drv_info->tx_lock);
 704         }
 705
 706         ret = ffa_setup_and_transmit(func_id, buffer, rxtx_bufsz, args);
 707
 708         if (args->use_txbuf)
 709                 mutex_unlock(&drv_info->tx_lock);
 710         else
 711                 free_pages_exact(buffer, rxtx_bufsz);
 712
 713         return ret < 0 ? ret : 0;
 714 }
 715
 716 static int ffa_memory_reclaim(u64 g_handle, u32 flags)
 717 {
 718         ffa_value_t ret;
 719
 720         invoke_ffa_fn((ffa_value_t){
 721                       .a0 = FFA_MEM_RECLAIM,
 722                       .a1 = HANDLE_LOW(g_handle), .a2 = HANDLE_HIGH(g_handle),
 723                       .a3 = flags,
 724                       }, &ret);
 725
 726         if (ret.a0 == FFA_ERROR)
 727                 return ffa_to_linux_errno((int)ret.a2);
 728
 729         return 0;
 730 }
 731
 732 static int ffa_notification_bitmap_create(void)
 733 {
 734         ffa_value_t ret;
 735         u16 vcpu_count = nr_cpu_ids;
 736
 737         invoke_ffa_fn((ffa_value_t){
 738                       .a0 = FFA_NOTIFICATION_BITMAP_CREATE,
 739                       .a1 = drv_info->vm_id, .a2 = vcpu_count,
 740                       }, &ret);
 741
 742         if (ret.a0 == FFA_ERROR)
 743                 return ffa_to_linux_errno((int)ret.a2);
 744
 745         return 0;
 746 }
 747
 748 static int ffa_notification_bitmap_destroy(void)
 749 {
 750         ffa_value_t ret;
 751
 752         invoke_ffa_fn((ffa_value_t){
 753                       .a0 = FFA_NOTIFICATION_BITMAP_DESTROY,
 754                       .a1 = drv_info->vm_id,
 755                       }, &ret);
 756
 757         if (ret.a0 == FFA_ERROR)
 758                 return ffa_to_linux_errno((int)ret.a2);
 759
 760         return 0;
 761 }
 762
 763 #define NOTIFICATION_LOW_MASK           GENMASK(31, 0)
 764 #define NOTIFICATION_HIGH_MASK          GENMASK(63, 32)
 765 #define NOTIFICATION_BITMAP_HIGH(x)     \
 766                 ((u32)(FIELD_GET(NOTIFICATION_HIGH_MASK, (x))))
 767 #define NOTIFICATION_BITMAP_LOW(x)      \
 768                 ((u32)(FIELD_GET(NOTIFICATION_LOW_MASK, (x))))
 769 #define PACK_NOTIFICATION_BITMAP(low, high)     \
 770         (FIELD_PREP(NOTIFICATION_LOW_MASK, (low)) | \
 771          FIELD_PREP(NOTIFICATION_HIGH_MASK, (high)))
 772
 773 #define RECEIVER_VCPU_MASK              GENMASK(31, 16)
 774 #define PACK_NOTIFICATION_GET_RECEIVER_INFO(vcpu_r, r) \
 775         (FIELD_PREP(RECEIVER_VCPU_MASK, (vcpu_r)) | \
 776          FIELD_PREP(RECEIVER_ID_MASK, (r)))
 777
 778 #define NOTIFICATION_INFO_GET_MORE_PEND_MASK    BIT(0)
 779 #define NOTIFICATION_INFO_GET_ID_COUNT          GENMASK(11, 7)
 780 #define ID_LIST_MASK_64                         GENMASK(51, 12)
 781 #define ID_LIST_MASK_32                         GENMASK(31, 12)
 782 #define MAX_IDS_64                              20
 783 #define MAX_IDS_32                              10
 784
 785 #define PER_VCPU_NOTIFICATION_FLAG              BIT(0)
 786 #define SECURE_PARTITION_BITMAP                 BIT(0)
 787 #define NON_SECURE_VM_BITMAP                    BIT(1)
 788 #define SPM_FRAMEWORK_BITMAP                    BIT(2)
 789 #define NS_HYP_FRAMEWORK_BITMAP                 BIT(3)
 790
 791 static int ffa_notification_bind_common(u16 dst_id, u64 bitmap,
 792                                         u32 flags, bool is_bind)
 793 {
 794         ffa_value_t ret;
 795         u32 func, src_dst_ids = PACK_TARGET_INFO(dst_id, drv_info->vm_id);
 796
 797         func = is_bind ? FFA_NOTIFICATION_BIND : FFA_NOTIFICATION_UNBIND;
 798
 799         invoke_ffa_fn((ffa_value_t){
 800                   .a0 = func, .a1 = src_dst_ids, .a2 = flags,
 801                   .a3 = NOTIFICATION_BITMAP_LOW(bitmap),
 802                   .a4 = NOTIFICATION_BITMAP_HIGH(bitmap),
 803                   }, &ret);
 804
 805         if (ret.a0 == FFA_ERROR)
 806                 return ffa_to_linux_errno((int)ret.a2);
 807         else if (ret.a0 != FFA_SUCCESS)
 808                 return -EINVAL;
 809
 810         return 0;
 811 }
 812
 813 static
 814 int ffa_notification_set(u16 src_id, u16 dst_id, u32 flags, u64 bitmap)
 815 {
 816         ffa_value_t ret;
 817         u32 src_dst_ids = PACK_TARGET_INFO(dst_id, src_id);
 818
 819         invoke_ffa_fn((ffa_value_t) {
 820                   .a0 = FFA_NOTIFICATION_SET, .a1 = src_dst_ids, .a2 = flags,
 821                   .a3 = NOTIFICATION_BITMAP_LOW(bitmap),
 822                   .a4 = NOTIFICATION_BITMAP_HIGH(bitmap),
 823                   }, &ret);
 824
 825         if (ret.a0 == FFA_ERROR)
 826                 return ffa_to_linux_errno((int)ret.a2);
 827         else if (ret.a0 != FFA_SUCCESS)
 828                 return -EINVAL;
 829
 830         return 0;
 831 }
 832
 833 struct ffa_notify_bitmaps {
 834         u64 sp_map;
 835         u64 vm_map;
 836         u64 arch_map;
 837 };
 838
 839 static int ffa_notification_get(u32 flags, struct ffa_notify_bitmaps *notify)
 840 {
 841         ffa_value_t ret;
 842         u16 src_id = drv_info->vm_id;
 843         u16 cpu_id = smp_processor_id();
 844         u32 rec_vcpu_ids = PACK_NOTIFICATION_GET_RECEIVER_INFO(cpu_id, src_id);
 845
 846         invoke_ffa_fn((ffa_value_t){
 847                   .a0 = FFA_NOTIFICATION_GET, .a1 = rec_vcpu_ids, .a2 = flags,
 848                   }, &ret);
 849
 850         if (ret.a0 == FFA_ERROR)
 851                 return ffa_to_linux_errno((int)ret.a2);
 852         else if (ret.a0 != FFA_SUCCESS)
 853                 return -EINVAL; /* Something else went wrong. */
 854
 855         notify->sp_map = PACK_NOTIFICATION_BITMAP(ret.a2, ret.a3);
 856         notify->vm_map = PACK_NOTIFICATION_BITMAP(ret.a4, ret.a5);
 857         notify->arch_map = PACK_NOTIFICATION_BITMAP(ret.a6, ret.a7);
 858
 859         return 0;
 860 }
 861
 862 struct ffa_dev_part_info {
 863         ffa_sched_recv_cb callback;
 864         void *cb_data;
 865         rwlock_t rw_lock;
 866 };
 867
 868 static void __do_sched_recv_cb(u16 part_id, u16 vcpu, bool is_per_vcpu)
 869 {
 870         struct ffa_dev_part_info *partition;
 871         ffa_sched_recv_cb callback;
 872         void *cb_data;
 873
 874         partition = xa_load(&drv_info->partition_info, part_id);
 875         if (!partition) {
 876                 pr_err("%s: Invalid partition ID 0x%x\n", __func__, part_id);
 877                 return;
 878         }
 879
 880         read_lock(&partition->rw_lock);
 881         callback = partition->callback;
 882         cb_data = partition->cb_data;
 883         read_unlock(&partition->rw_lock);
 884
 885         if (callback)
 886                 callback(vcpu, is_per_vcpu, cb_data);
 887 }
 888
 889 static void ffa_notification_info_get(void)
 890 {
 891         int idx, list, max_ids, lists_cnt, ids_processed, ids_count[MAX_IDS_64];
 892         bool is_64b_resp;
 893         ffa_value_t ret;
 894         u64 id_list;
 895
 896         do {
 897                 invoke_ffa_fn((ffa_value_t){
 898                           .a0 = FFA_FN_NATIVE(NOTIFICATION_INFO_GET),
 899                           }, &ret);
 900
 901                 if (ret.a0 != FFA_FN_NATIVE(SUCCESS) && ret.a0 != FFA_SUCCESS) {
 902                         if (ret.a2 != FFA_RET_NO_DATA)
 903                                 pr_err("Notification Info fetch failed: 0x%lx (0x%lx)",
 904                                        ret.a0, ret.a2);
 905                         return;
 906                 }
 907
 908                 is_64b_resp = (ret.a0 == FFA_FN64_SUCCESS);
 909
 910                 ids_processed = 0;
 911                 lists_cnt = FIELD_GET(NOTIFICATION_INFO_GET_ID_COUNT, ret.a2);
 912                 if (is_64b_resp) {
 913                         max_ids = MAX_IDS_64;
 914                         id_list = FIELD_GET(ID_LIST_MASK_64, ret.a2);
 915                 } else {
 916                         max_ids = MAX_IDS_32;
 917                         id_list = FIELD_GET(ID_LIST_MASK_32, ret.a2);
 918                 }
 919
 920                 for (idx = 0; idx < lists_cnt; idx++, id_list >>= 2)
 921                         ids_count[idx] = (id_list & 0x3) + 1;
 922
 923                 /* Process IDs */
 924                 for (list = 0; list < lists_cnt; list++) {
 925                         u16 vcpu_id, part_id, *packed_id_list = (u16 *)&ret.a3;
 926
 927                         if (ids_processed >= max_ids - 1)
 928                                 break;
 929
 930                         part_id = packed_id_list[ids_processed++];
 931
 932                         if (ids_count[list] == 1) { /* Global Notification */
 933                                 __do_sched_recv_cb(part_id, 0, false);
 934                                 continue;
 935                         }
 936
 937                         /* Per vCPU Notification */
 938                         for (idx = 0; idx < ids_count[list]; idx++) {
 939                                 if (ids_processed >= max_ids - 1)
 940                                         break;
 941
 942                                 vcpu_id = packed_id_list[ids_processed++];
 943
 944                                 __do_sched_recv_cb(part_id, vcpu_id, true);
 945                         }
 946                 }
 947         } while (ret.a2 & NOTIFICATION_INFO_GET_MORE_PEND_MASK);
 948 }
 949
 950 static int ffa_run(struct ffa_device *dev, u16 vcpu)
 951 {
 952         ffa_value_t ret;
 953         u32 target = dev->vm_id << 16 | vcpu;
 954
 955         invoke_ffa_fn((ffa_value_t){ .a0 = FFA_RUN, .a1 = target, }, &ret);
 956
 957         while (ret.a0 == FFA_INTERRUPT)
 958                 invoke_ffa_fn((ffa_value_t){ .a0 = FFA_RUN, .a1 = ret.a1, },
 959                               &ret);
 960
 961         if (ret.a0 == FFA_ERROR)
 962                 return ffa_to_linux_errno((int)ret.a2);
 963
 964         return 0;
 965 }
 966
 967 static void ffa_drvinfo_flags_init(void)
 968 {
 969         if (!ffa_features(FFA_FN_NATIVE(MEM_LEND), 0, NULL, NULL) ||
 970             !ffa_features(FFA_FN_NATIVE(MEM_SHARE), 0, NULL, NULL))
 971                 drv_info->mem_ops_native = true;
 972
 973         if (!ffa_features(FFA_MSG_SEND_DIRECT_REQ2, 0, NULL, NULL) ||
 974             !ffa_features(FFA_MSG_SEND_DIRECT_RESP2, 0, NULL, NULL))
 975                 drv_info->msg_direct_req2_supp = true;
 976 }
 977
 978 static u32 ffa_api_version_get(void)
 979 {
 980         return drv_info->version;
 981 }
 982
 983 static int ffa_partition_info_get(const char *uuid_str,
 984                                   struct ffa_partition_info *buffer)
 985 {
 986         int count;
 987         uuid_t uuid;
 988         struct ffa_partition_info *pbuf;
 989
 990         if (uuid_parse(uuid_str, &uuid)) {
 991                 pr_err("invalid uuid (%s)\n", uuid_str);
 992                 return -ENODEV;
 993         }
 994
 995         count = ffa_partition_probe(&uuid, &pbuf);
 996         if (count <= 0)
 997                 return -ENOENT;
 998
 999         memcpy(buffer, pbuf, sizeof(*pbuf) * count);
1000         kfree(pbuf);
1001         return 0;
1002 }
1003
1004 static void ffa_mode_32bit_set(struct ffa_device *dev)
1005 {
1006         dev->mode_32bit = true;
1007 }
1008
1009 static int ffa_sync_send_receive(struct ffa_device *dev,
1010                                  struct ffa_send_direct_data *data)
1011 {
1012         return ffa_msg_send_direct_req(drv_info->vm_id, dev->vm_id,
1013                                        dev->mode_32bit, data);
1014 }
1015
1016 static int ffa_indirect_msg_send(struct ffa_device *dev, void *buf, size_t sz)
1017 {
1018         return ffa_msg_send2(drv_info->vm_id, dev->vm_id, buf, sz);
1019 }
1020
1021 static int ffa_sync_send_receive2(struct ffa_device *dev, const uuid_t *uuid,
1022                                   struct ffa_send_direct_data2 *data)
1023 {
1024         if (!drv_info->msg_direct_req2_supp)
1025                 return -EOPNOTSUPP;
1026
1027         return ffa_msg_send_direct_req2(drv_info->vm_id, dev->vm_id,
1028                                         uuid, data);
1029 }
1030
1031 static int ffa_memory_share(struct ffa_mem_ops_args *args)
1032 {
1033         if (drv_info->mem_ops_native)
1034                 return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args);
1035
1036         return ffa_memory_ops(FFA_MEM_SHARE, args);
1037 }
1038
1039 static int ffa_memory_lend(struct ffa_mem_ops_args *args)
1040 {
1041         /* Note that upon a successful MEM_LEND request the caller
1042          * must ensure that the memory region specified is not accessed
1043          * until a successful MEM_RECALIM call has been made.
1044          * On systems with a hypervisor present this will been enforced,
1045          * however on systems without a hypervisor the responsibility
1046          * falls to the calling kernel driver to prevent access.
1047          */
1048         if (drv_info->mem_ops_native)
1049                 return ffa_memory_ops(FFA_FN_NATIVE(MEM_LEND), args);
1050
1051         return ffa_memory_ops(FFA_MEM_LEND, args);
1052 }
1053
1054 #define FFA_SECURE_PARTITION_ID_FLAG    BIT(15)
1055
1056 #define ffa_notifications_disabled()    (!drv_info->notif_enabled)
1057
1058 enum notify_type {
1059         NON_SECURE_VM,
1060         SECURE_PARTITION,
1061         FRAMEWORK,
1062 };
1063
1064 struct notifier_cb_info {
1065         struct hlist_node hnode;
1066         ffa_notifier_cb cb;
1067         void *cb_data;
1068         enum notify_type type;
1069 };
1070
1071 static int ffa_sched_recv_cb_update(u16 part_id, ffa_sched_recv_cb callback,
1072                                     void *cb_data, bool is_registration)
1073 {
1074         struct ffa_dev_part_info *partition;
1075         bool cb_valid;
1076
1077         if (ffa_notifications_disabled())
1078                 return -EOPNOTSUPP;
1079
1080         partition = xa_load(&drv_info->partition_info, part_id);
1081         if (!partition) {
1082                 pr_err("%s: Invalid partition ID 0x%x\n", __func__, part_id);
1083                 return -EINVAL;
1084         }
1085
1086         write_lock(&partition->rw_lock);
1087
1088         cb_valid = !!partition->callback;
1089         if (!(is_registration ^ cb_valid)) {
1090                 write_unlock(&partition->rw_lock);
1091                 return -EINVAL;
1092         }
1093
1094         partition->callback = callback;
1095         partition->cb_data = cb_data;
1096
1097         write_unlock(&partition->rw_lock);
1098         return 0;
1099 }
1100
1101 static int ffa_sched_recv_cb_register(struct ffa_device *dev,
1102                                       ffa_sched_recv_cb cb, void *cb_data)
1103 {
1104         return ffa_sched_recv_cb_update(dev->vm_id, cb, cb_data, true);
1105 }
1106
1107 static int ffa_sched_recv_cb_unregister(struct ffa_device *dev)
1108 {
1109         return ffa_sched_recv_cb_update(dev->vm_id, NULL, NULL, false);
1110 }
1111
1112 static int ffa_notification_bind(u16 dst_id, u64 bitmap, u32 flags)
1113 {
1114         return ffa_notification_bind_common(dst_id, bitmap, flags, true);
1115 }
1116
1117 static int ffa_notification_unbind(u16 dst_id, u64 bitmap)
1118 {
1119         return ffa_notification_bind_common(dst_id, bitmap, 0, false);
1120 }
1121
1122 /* Should be called while the notify_lock is taken */
1123 static struct notifier_cb_info *
1124 notifier_hash_node_get(u16 notify_id, enum notify_type type)
1125 {
1126         struct notifier_cb_info *node;
1127
1128         hash_for_each_possible(drv_info->notifier_hash, node, hnode, notify_id)
1129                 if (type == node->type)
1130                         return node;
1131
1132         return NULL;
1133 }
1134
1135 static int
1136 update_notifier_cb(int notify_id, enum notify_type type, ffa_notifier_cb cb,
1137                    void *cb_data, bool is_registration)
1138 {
1139         struct notifier_cb_info *cb_info = NULL;
1140         bool cb_found;
1141
1142         cb_info = notifier_hash_node_get(notify_id, type);
1143         cb_found = !!cb_info;
1144
1145         if (!(is_registration ^ cb_found))
1146                 return -EINVAL;
1147
1148         if (is_registration) {
1149                 cb_info = kzalloc(sizeof(*cb_info), GFP_KERNEL);
1150                 if (!cb_info)
1151                         return -ENOMEM;
1152
1153                 cb_info->type = type;
1154                 cb_info->cb = cb;
1155                 cb_info->cb_data = cb_data;
1156
1157                 hash_add(drv_info->notifier_hash, &cb_info->hnode, notify_id);
1158         } else {
1159                 hash_del(&cb_info->hnode);
1160         }
1161
1162         return 0;
1163 }
1164
1165 static enum notify_type ffa_notify_type_get(u16 vm_id)
1166 {
1167         if (vm_id & FFA_SECURE_PARTITION_ID_FLAG)
1168                 return SECURE_PARTITION;
1169         else
1170                 return NON_SECURE_VM;
1171 }
1172
1173 static int ffa_notify_relinquish(struct ffa_device *dev, int notify_id)
1174 {
1175         int rc;
1176         enum notify_type type = ffa_notify_type_get(dev->vm_id);
1177
1178         if (ffa_notifications_disabled())
1179                 return -EOPNOTSUPP;
1180
1181         if (notify_id >= FFA_MAX_NOTIFICATIONS)
1182                 return -EINVAL;
1183
1184         mutex_lock(&drv_info->notify_lock);
1185
1186         rc = update_notifier_cb(notify_id, type, NULL, NULL, false);
1187         if (rc) {
1188                 pr_err("Could not unregister notification callback\n");
1189                 mutex_unlock(&drv_info->notify_lock);
1190                 return rc;
1191         }
1192
1193         rc = ffa_notification_unbind(dev->vm_id, BIT(notify_id));
1194
1195         mutex_unlock(&drv_info->notify_lock);
1196
1197         return rc;
1198 }
1199
1200 static int ffa_notify_request(struct ffa_device *dev, bool is_per_vcpu,
1201                               ffa_notifier_cb cb, void *cb_data, int notify_id)
1202 {
1203         int rc;
1204         u32 flags = 0;
1205         enum notify_type type = ffa_notify_type_get(dev->vm_id);
1206
1207         if (ffa_notifications_disabled())
1208                 return -EOPNOTSUPP;
1209
1210         if (notify_id >= FFA_MAX_NOTIFICATIONS)
1211                 return -EINVAL;
1212
1213         mutex_lock(&drv_info->notify_lock);
1214
1215         if (is_per_vcpu)
1216                 flags = PER_VCPU_NOTIFICATION_FLAG;
1217
1218         rc = ffa_notification_bind(dev->vm_id, BIT(notify_id), flags);
1219         if (rc) {
1220                 mutex_unlock(&drv_info->notify_lock);
1221                 return rc;
1222         }
1223
1224         rc = update_notifier_cb(notify_id, type, cb, cb_data, true);
1225         if (rc) {
1226                 pr_err("Failed to register callback for %d - %d\n",
1227                        notify_id, rc);
1228                 ffa_notification_unbind(dev->vm_id, BIT(notify_id));
1229         }
1230         mutex_unlock(&drv_info->notify_lock);
1231
1232         return rc;
1233 }
1234
1235 static int ffa_notify_send(struct ffa_device *dev, int notify_id,
1236                            bool is_per_vcpu, u16 vcpu)
1237 {
1238         u32 flags = 0;
1239
1240         if (ffa_notifications_disabled())
1241                 return -EOPNOTSUPP;
1242
1243         if (is_per_vcpu)
1244                 flags |= (PER_VCPU_NOTIFICATION_FLAG | vcpu << 16);
1245
1246         return ffa_notification_set(dev->vm_id, drv_info->vm_id, flags,
1247                                     BIT(notify_id));
1248 }
1249
1250 static void handle_notif_callbacks(u64 bitmap, enum notify_type type)
1251 {
1252         int notify_id;
1253         struct notifier_cb_info *cb_info = NULL;
1254
1255         for (notify_id = 0; notify_id <= FFA_MAX_NOTIFICATIONS && bitmap;
1256              notify_id++, bitmap >>= 1) {
1257                 if (!(bitmap & 1))
1258                         continue;
1259
1260                 mutex_lock(&drv_info->notify_lock);
1261                 cb_info = notifier_hash_node_get(notify_id, type);
1262                 mutex_unlock(&drv_info->notify_lock);
1263
1264                 if (cb_info && cb_info->cb)
1265                         cb_info->cb(notify_id, cb_info->cb_data);
1266         }
1267 }
1268
1269 static void notif_get_and_handle(void *unused)
1270 {
1271         int rc;
1272         struct ffa_notify_bitmaps bitmaps;
1273
1274         rc = ffa_notification_get(SECURE_PARTITION_BITMAP |
1275                                   SPM_FRAMEWORK_BITMAP, &bitmaps);
1276         if (rc) {
1277                 pr_err("Failed to retrieve notifications with %d!\n", rc);
1278                 return;
1279         }
1280
1281         handle_notif_callbacks(bitmaps.vm_map, NON_SECURE_VM);
1282         handle_notif_callbacks(bitmaps.sp_map, SECURE_PARTITION);
1283         handle_notif_callbacks(bitmaps.arch_map, FRAMEWORK);
1284 }
1285
1286 static void
1287 ffa_self_notif_handle(u16 vcpu, bool is_per_vcpu, void *cb_data)
1288 {
1289         struct ffa_drv_info *info = cb_data;
1290
1291         if (!is_per_vcpu)
1292                 notif_get_and_handle(info);
1293         else
1294                 smp_call_function_single(vcpu, notif_get_and_handle, info, 0);
1295 }
1296
1297 static void notif_pcpu_irq_work_fn(struct work_struct *work)
1298 {
1299         struct ffa_drv_info *info = container_of(work, struct ffa_drv_info,
1300                                                  notif_pcpu_work);
1301
1302         ffa_self_notif_handle(smp_processor_id(), true, info);
1303 }
1304
1305 static const struct ffa_info_ops ffa_drv_info_ops = {
1306         .api_version_get = ffa_api_version_get,
1307         .partition_info_get = ffa_partition_info_get,
1308 };
1309
1310 static const struct ffa_msg_ops ffa_drv_msg_ops = {
1311         .mode_32bit_set = ffa_mode_32bit_set,
1312         .sync_send_receive = ffa_sync_send_receive,
1313         .indirect_send = ffa_indirect_msg_send,
1314         .sync_send_receive2 = ffa_sync_send_receive2,
1315 };
1316
1317 static const struct ffa_mem_ops ffa_drv_mem_ops = {
1318         .memory_reclaim = ffa_memory_reclaim,
1319         .memory_share = ffa_memory_share,
1320         .memory_lend = ffa_memory_lend,
1321 };
1322
1323 static const struct ffa_cpu_ops ffa_drv_cpu_ops = {
1324         .run = ffa_run,
1325 };
1326
1327 static const struct ffa_notifier_ops ffa_drv_notifier_ops = {
1328         .sched_recv_cb_register = ffa_sched_recv_cb_register,
1329         .sched_recv_cb_unregister = ffa_sched_recv_cb_unregister,
1330         .notify_request = ffa_notify_request,
1331         .notify_relinquish = ffa_notify_relinquish,
1332         .notify_send = ffa_notify_send,
1333 };
1334
1335 static const struct ffa_ops ffa_drv_ops = {
1336         .info_ops = &ffa_drv_info_ops,
1337         .msg_ops = &ffa_drv_msg_ops,
1338         .mem_ops = &ffa_drv_mem_ops,
1339         .cpu_ops = &ffa_drv_cpu_ops,
1340         .notifier_ops = &ffa_drv_notifier_ops,
1341 };
1342
1343 void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid)
1344 {
1345         int count, idx;
1346         struct ffa_partition_info *pbuf, *tpbuf;
1347
1348         count = ffa_partition_probe(uuid, &pbuf);
1349         if (count <= 0)
1350                 return;
1351
1352         for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++)
1353                 if (tpbuf->id == ffa_dev->vm_id)
1354                         uuid_copy(&ffa_dev->uuid, uuid);
1355         kfree(pbuf);
1356 }
1357
1358 static int
1359 ffa_bus_notifier(struct notifier_block *nb, unsigned long action, void *data)
1360 {
1361         struct device *dev = data;
1362         struct ffa_device *fdev = to_ffa_dev(dev);
1363
1364         if (action == BUS_NOTIFY_BIND_DRIVER) {
1365                 struct ffa_driver *ffa_drv = to_ffa_driver(dev->driver);
1366                 const struct ffa_device_id *id_table = ffa_drv->id_table;
1367
1368                 /*
1369                  * FF-A v1.1 provides UUID for each partition as part of the
1370                  * discovery API, the discovered UUID must be populated in the
1371                  * device's UUID and there is no need to workaround by copying
1372                  * the same from the driver table.
1373                  */
1374                 if (uuid_is_null(&fdev->uuid))
1375                         ffa_device_match_uuid(fdev, &id_table->uuid);
1376
1377                 return NOTIFY_OK;
1378         }
1379
1380         return NOTIFY_DONE;
1381 }
1382
1383 static struct notifier_block ffa_bus_nb = {
1384         .notifier_call = ffa_bus_notifier,
1385 };
1386
1387 static int ffa_setup_partitions(void)
1388 {
1389         int count, idx, ret;
1390         struct ffa_device *ffa_dev;
1391         struct ffa_dev_part_info *info;
1392         struct ffa_partition_info *pbuf, *tpbuf;
1393
1394         if (drv_info->version == FFA_VERSION_1_0) {
1395                 ret = bus_register_notifier(&ffa_bus_type, &ffa_bus_nb);
1396                 if (ret)
1397                         pr_err("Failed to register FF-A bus notifiers\n");
1398         }
1399
1400         count = ffa_partition_probe(&uuid_null, &pbuf);
1401         if (count <= 0) {
1402                 pr_info("%s: No partitions found, error %d\n", __func__, count);
1403                 return -EINVAL;
1404         }
1405
1406         xa_init(&drv_info->partition_info);
1407         for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) {
1408                 /* Note that if the UUID will be uuid_null, that will require
1409                  * ffa_bus_notifier() to find the UUID of this partition id
1410                  * with help of ffa_device_match_uuid(). FF-A v1.1 and above
1411                  * provides UUID here for each partition as part of the
1412                  * discovery API and the same is passed.
1413                  */
1414                 ffa_dev = ffa_device_register(tpbuf, &ffa_drv_ops);
1415                 if (!ffa_dev) {
1416                         pr_err("%s: failed to register partition ID 0x%x\n",
1417                                __func__, tpbuf->id);
1418                         continue;
1419                 }
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");