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/minmax.h> 36 #include <linux/module.h> 37 #include <linux/mm.h> 38 #include <linux/mutex.h> 39 #include <linux/of_irq.h> 40 #include <linux/platform_device.h> 41 #include <linux/scatterlist.h> 42 #include <linux/slab.h> 43 #include <linux/smp.h> 44 #include <linux/uuid.h> 45 #include <linux/xarray.h> 46 47 #include <asm/virt.h> 48 49 #include "common.h" 50 51 #define FFA_DRIVER_VERSION FFA_VERSION_1_2 52 #define FFA_MIN_VERSION FFA_VERSION_1_0 53 #define FFA_PLATFORM_NAME "arm-ffa" 54 55 #define SENDER_ID_MASK GENMASK(31, 16) 56 #define RECEIVER_ID_MASK GENMASK(15, 0) 57 #define SENDER_ID(x) ((u16)(FIELD_GET(SENDER_ID_MASK, (x)))) 58 #define RECEIVER_ID(x) ((u16)(FIELD_GET(RECEIVER_ID_MASK, (x)))) 59 #define PACK_TARGET_INFO(s, r) \ 60 (FIELD_PREP(SENDER_ID_MASK, (s)) | FIELD_PREP(RECEIVER_ID_MASK, (r))) 61 62 #define RXTX_MAP_MIN_BUFSZ_MASK GENMASK(1, 0) 63 #define RXTX_MAP_MAX_BUFSZ_MASK GENMASK(31, 16) 64 #define RXTX_MAP_MIN_BUFSZ(x) (FIELD_GET(RXTX_MAP_MIN_BUFSZ_MASK, (x))) 65 #define RXTX_MAP_MAX_BUFSZ(x) (FIELD_GET(RXTX_MAP_MAX_BUFSZ_MASK, (x))) 66 67 #define FFA_MAX_NOTIFICATIONS 64 68 69 static ffa_fn *invoke_ffa_fn; 70 71 static const int ffa_linux_errmap[] = { 72 /* better than switch case as long as return value is continuous */ 73 0, /* FFA_RET_SUCCESS */ 74 -EOPNOTSUPP, /* FFA_RET_NOT_SUPPORTED */ 75 -EINVAL, /* FFA_RET_INVALID_PARAMETERS */ 76 -ENOMEM, /* FFA_RET_NO_MEMORY */ 77 -EBUSY, /* FFA_RET_BUSY */ 78 -EINTR, /* FFA_RET_INTERRUPTED */ 79 -EACCES, /* FFA_RET_DENIED */ 80 -EAGAIN, /* FFA_RET_RETRY */ 81 -ECANCELED, /* FFA_RET_ABORTED */ 82 -ENODATA, /* FFA_RET_NO_DATA */ 83 -EAGAIN, /* FFA_RET_NOT_READY */ 84 }; 85 86 static inline int ffa_to_linux_errno(int errno) 87 { 88 int err_idx = -errno; 89 90 if (err_idx >= 0 && err_idx < ARRAY_SIZE(ffa_linux_errmap)) 91 return ffa_linux_errmap[err_idx]; 92 return -EINVAL; 93 } 94 95 struct ffa_pcpu_irq { 96 struct ffa_drv_info *info; 97 struct work_struct notif_pcpu_work; 98 }; 99 100 struct ffa_drv_info { 101 u32 version; 102 u16 vm_id; 103 struct mutex rx_lock; /* lock to protect Rx buffer */ 104 struct mutex tx_lock; /* lock to protect Tx buffer */ 105 void *rx_buffer; 106 void *tx_buffer; 107 size_t rxtx_bufsz; 108 bool mem_ops_native; 109 bool msg_direct_req2_supp; 110 bool bitmap_created; 111 bool bus_notifier_registered; 112 bool notif_enabled; 113 unsigned int sched_recv_irq; 114 unsigned int notif_pend_irq; 115 unsigned int cpuhp_state; 116 struct ffa_pcpu_irq __percpu *irq_pcpu; 117 struct workqueue_struct *notif_pcpu_wq; 118 struct work_struct sched_recv_irq_work; 119 struct xarray partition_info; 120 DECLARE_HASHTABLE(notifier_hash, ilog2(FFA_MAX_NOTIFICATIONS)); 121 rwlock_t notify_lock; /* lock to protect notifier hashtable */ 122 }; 123 124 static struct ffa_drv_info *drv_info; 125 static struct platform_device *ffa_pdev; 126 127 /* 128 * The driver must be able to support all the versions from the earliest 129 * supported FFA_MIN_VERSION to the latest supported FFA_DRIVER_VERSION. 130 * The specification states that if firmware supports a FFA implementation 131 * that is incompatible with and at a greater version number than specified 132 * by the caller(FFA_DRIVER_VERSION passed as parameter to FFA_VERSION), 133 * it must return the NOT_SUPPORTED error code. 134 */ 135 static u32 ffa_compatible_version_find(u32 version) 136 { 137 u16 major = FFA_MAJOR_VERSION(version), minor = FFA_MINOR_VERSION(version); 138 u16 drv_major = FFA_MAJOR_VERSION(FFA_DRIVER_VERSION); 139 u16 drv_minor = FFA_MINOR_VERSION(FFA_DRIVER_VERSION); 140 141 if ((major < drv_major) || (major == drv_major && minor <= drv_minor)) 142 return version; 143 144 pr_info("Firmware version higher than driver version, downgrading\n"); 145 return FFA_DRIVER_VERSION; 146 } 147 148 static int ffa_version_check(u32 *version) 149 { 150 ffa_value_t ver; 151 152 invoke_ffa_fn((ffa_value_t){ 153 .a0 = FFA_VERSION, .a1 = FFA_DRIVER_VERSION, 154 }, &ver); 155 156 if ((s32)ver.a0 == FFA_RET_NOT_SUPPORTED) { 157 pr_info("FFA_VERSION returned not supported\n"); 158 return -EOPNOTSUPP; 159 } 160 161 if (FFA_MAJOR_VERSION(ver.a0) > FFA_MAJOR_VERSION(FFA_DRIVER_VERSION)) { 162 pr_err("Incompatible v%d.%d! Latest supported v%d.%d\n", 163 FFA_MAJOR_VERSION(ver.a0), FFA_MINOR_VERSION(ver.a0), 164 FFA_MAJOR_VERSION(FFA_DRIVER_VERSION), 165 FFA_MINOR_VERSION(FFA_DRIVER_VERSION)); 166 return -EINVAL; 167 } 168 169 if (ver.a0 < FFA_MIN_VERSION) { 170 pr_err("Incompatible v%d.%d! Earliest supported v%d.%d\n", 171 FFA_MAJOR_VERSION(ver.a0), FFA_MINOR_VERSION(ver.a0), 172 FFA_MAJOR_VERSION(FFA_MIN_VERSION), 173 FFA_MINOR_VERSION(FFA_MIN_VERSION)); 174 return -EINVAL; 175 } 176 177 pr_info("Driver version %d.%d\n", FFA_MAJOR_VERSION(FFA_DRIVER_VERSION), 178 FFA_MINOR_VERSION(FFA_DRIVER_VERSION)); 179 pr_info("Firmware version %d.%d found\n", FFA_MAJOR_VERSION(ver.a0), 180 FFA_MINOR_VERSION(ver.a0)); 181 *version = ffa_compatible_version_find(ver.a0); 182 183 return 0; 184 } 185 186 static int ffa_rx_release(void) 187 { 188 ffa_value_t ret; 189 190 invoke_ffa_fn((ffa_value_t){ 191 .a0 = FFA_RX_RELEASE, 192 }, &ret); 193 194 if (ret.a0 == FFA_ERROR) 195 return ffa_to_linux_errno((int)ret.a2); 196 197 /* check for ret.a0 == FFA_RX_RELEASE ? */ 198 199 return 0; 200 } 201 202 static int ffa_rxtx_map(phys_addr_t tx_buf, phys_addr_t rx_buf, u32 pg_cnt) 203 { 204 ffa_value_t ret; 205 206 invoke_ffa_fn((ffa_value_t){ 207 .a0 = FFA_FN_NATIVE(RXTX_MAP), 208 .a1 = tx_buf, .a2 = rx_buf, .a3 = pg_cnt, 209 }, &ret); 210 211 if (ret.a0 == FFA_ERROR) 212 return ffa_to_linux_errno((int)ret.a2); 213 214 return 0; 215 } 216 217 static int ffa_rxtx_unmap(void) 218 { 219 ffa_value_t ret; 220 221 invoke_ffa_fn((ffa_value_t){ 222 .a0 = FFA_RXTX_UNMAP, 223 }, &ret); 224 225 if (ret.a0 == FFA_ERROR) 226 return ffa_to_linux_errno((int)ret.a2); 227 228 return 0; 229 } 230 231 static int ffa_features(u32 func_feat_id, u32 input_props, 232 u32 *if_props_1, u32 *if_props_2) 233 { 234 ffa_value_t id; 235 236 if (!ARM_SMCCC_IS_FAST_CALL(func_feat_id) && input_props) { 237 pr_err("%s: Invalid Parameters: %x, %x", __func__, 238 func_feat_id, input_props); 239 return ffa_to_linux_errno(FFA_RET_INVALID_PARAMETERS); 240 } 241 242 invoke_ffa_fn((ffa_value_t){ 243 .a0 = FFA_FEATURES, .a1 = func_feat_id, .a2 = input_props, 244 }, &id); 245 246 if (id.a0 == FFA_ERROR) 247 return ffa_to_linux_errno((int)id.a2); 248 249 if (if_props_1) 250 *if_props_1 = id.a2; 251 if (if_props_2) 252 *if_props_2 = id.a3; 253 254 return 0; 255 } 256 257 #define PARTITION_INFO_GET_RETURN_COUNT_ONLY BIT(0) 258 #define FFA_SUPPORTS_GET_COUNT_ONLY(version) ((version) > FFA_VERSION_1_0) 259 #define FFA_PART_INFO_HAS_SIZE_IN_RESP(version) ((version) > FFA_VERSION_1_0) 260 #define FFA_PART_INFO_HAS_UUID_IN_RESP(version) ((version) > FFA_VERSION_1_0) 261 #define FFA_PART_INFO_HAS_EXEC_STATE_IN_RESP(version) \ 262 ((version) > FFA_VERSION_1_0) 263 264 /* buffer must be sizeof(struct ffa_partition_info) * num_partitions */ 265 static int 266 __ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3, 267 struct ffa_partition_info *buffer, int num_partitions) 268 { 269 int idx, count, flags = 0, sz, buf_sz; 270 ffa_value_t partition_info; 271 272 if (FFA_SUPPORTS_GET_COUNT_ONLY(drv_info->version) && 273 (!buffer || !num_partitions)) /* Just get the count for now */ 274 flags = PARTITION_INFO_GET_RETURN_COUNT_ONLY; 275 276 mutex_lock(&drv_info->rx_lock); 277 invoke_ffa_fn((ffa_value_t){ 278 .a0 = FFA_PARTITION_INFO_GET, 279 .a1 = uuid0, .a2 = uuid1, .a3 = uuid2, .a4 = uuid3, 280 .a5 = flags, 281 }, &partition_info); 282 283 if (partition_info.a0 == FFA_ERROR) { 284 mutex_unlock(&drv_info->rx_lock); 285 return ffa_to_linux_errno((int)partition_info.a2); 286 } 287 288 count = partition_info.a2; 289 290 if (FFA_PART_INFO_HAS_SIZE_IN_RESP(drv_info->version)) { 291 buf_sz = sz = partition_info.a3; 292 if (sz > sizeof(*buffer)) 293 buf_sz = sizeof(*buffer); 294 } else { 295 buf_sz = sz = 8; 296 } 297 298 if (buffer && count <= num_partitions) 299 for (idx = 0; idx < count; idx++) { 300 struct ffa_partition_info_le { 301 __le16 id; 302 __le16 exec_ctxt; 303 __le32 properties; 304 uuid_t uuid; 305 } *rx_buf = drv_info->rx_buffer + idx * sz; 306 struct ffa_partition_info *buf = buffer + idx; 307 308 buf->id = le16_to_cpu(rx_buf->id); 309 buf->exec_ctxt = le16_to_cpu(rx_buf->exec_ctxt); 310 buf->properties = le32_to_cpu(rx_buf->properties); 311 if (buf_sz > 8) 312 import_uuid(&buf->uuid, (u8 *)&rx_buf->uuid); 313 } 314 315 if (!(flags & PARTITION_INFO_GET_RETURN_COUNT_ONLY)) 316 ffa_rx_release(); 317 318 mutex_unlock(&drv_info->rx_lock); 319 320 return count; 321 } 322 323 #define LAST_INDEX_MASK GENMASK(15, 0) 324 #define CURRENT_INDEX_MASK GENMASK(31, 16) 325 #define UUID_INFO_TAG_MASK GENMASK(47, 32) 326 #define PARTITION_INFO_SZ_MASK GENMASK(63, 48) 327 #define PARTITION_COUNT(x) ((u16)(FIELD_GET(LAST_INDEX_MASK, (x))) + 1) 328 #define CURRENT_INDEX(x) ((u16)(FIELD_GET(CURRENT_INDEX_MASK, (x)))) 329 #define UUID_INFO_TAG(x) ((u16)(FIELD_GET(UUID_INFO_TAG_MASK, (x)))) 330 #define PARTITION_INFO_SZ(x) ((u16)(FIELD_GET(PARTITION_INFO_SZ_MASK, (x)))) 331 #define PART_INFO_ID_MASK GENMASK(15, 0) 332 #define PART_INFO_EXEC_CXT_MASK GENMASK(31, 16) 333 #define PART_INFO_PROPS_MASK GENMASK(63, 32) 334 #define FFA_PART_INFO_GET_REGS_FIRST_REG 3 335 #define FFA_PART_INFO_GET_REGS_MIN_REGS_PER_DESC 3 336 #define FFA_PART_INFO_GET_REGS_NUM_REGS \ 337 (sizeof(ffa_value_t) / sizeof_field(ffa_value_t, a0)) 338 #define PART_INFO_ID(x) ((u16)(FIELD_GET(PART_INFO_ID_MASK, (x)))) 339 #define PART_INFO_EXEC_CXT(x) ((u16)(FIELD_GET(PART_INFO_EXEC_CXT_MASK, (x)))) 340 #define PART_INFO_PROPERTIES(x) ((u32)(FIELD_GET(PART_INFO_PROPS_MASK, (x)))) 341 static int 342 __ffa_partition_info_get_regs(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3, 343 struct ffa_partition_info *buffer, int num_parts) 344 { 345 u16 buf_sz, start_idx = 0, cur_idx, count = 0, tag = 0; 346 struct ffa_partition_info *buf = buffer; 347 ffa_value_t partition_info; 348 349 do { 350 __le64 *regs; 351 int idx, nr_desc, buf_idx, regs_per_desc, max_desc; 352 353 invoke_ffa_fn((ffa_value_t){ 354 .a0 = FFA_PARTITION_INFO_GET_REGS, 355 .a1 = (u64)uuid1 << 32 | uuid0, 356 .a2 = (u64)uuid3 << 32 | uuid2, 357 .a3 = start_idx | tag << 16, 358 }, &partition_info); 359 360 if (partition_info.a0 == FFA_ERROR) 361 return ffa_to_linux_errno((int)partition_info.a2); 362 363 if (!count) 364 count = PARTITION_COUNT(partition_info.a2); 365 if (!buffer || !num_parts) /* count only */ 366 return count; 367 if (count > num_parts) 368 return -EINVAL; 369 370 cur_idx = CURRENT_INDEX(partition_info.a2); 371 if (cur_idx < start_idx || cur_idx >= count) 372 return -EINVAL; 373 374 buf_sz = PARTITION_INFO_SZ(partition_info.a2); 375 if (buf_sz % sizeof(*regs)) 376 return -EINVAL; 377 378 regs_per_desc = buf_sz / sizeof(*regs); 379 if (regs_per_desc < FFA_PART_INFO_GET_REGS_MIN_REGS_PER_DESC) 380 return -EINVAL; 381 382 nr_desc = cur_idx - start_idx + 1; 383 max_desc = (FFA_PART_INFO_GET_REGS_NUM_REGS - 384 FFA_PART_INFO_GET_REGS_FIRST_REG) / regs_per_desc; 385 if (nr_desc > max_desc) 386 return -EINVAL; 387 388 buf_idx = buf - buffer; 389 if (buf_idx + nr_desc > num_parts) 390 return -EINVAL; 391 392 tag = UUID_INFO_TAG(partition_info.a2); 393 394 regs = (void *)&partition_info.a3; 395 for (idx = 0; idx < nr_desc; idx++, buf++) { 396 union { 397 uuid_t uuid; 398 u64 regs[2]; 399 } uuid_regs = { 400 .regs = { 401 le64_to_cpu(*(regs + 1)), 402 le64_to_cpu(*(regs + 2)), 403 } 404 }; 405 u64 val = *(u64 *)regs; 406 407 buf->id = PART_INFO_ID(val); 408 buf->exec_ctxt = PART_INFO_EXEC_CXT(val); 409 buf->properties = PART_INFO_PROPERTIES(val); 410 uuid_copy(&buf->uuid, &uuid_regs.uuid); 411 regs += regs_per_desc; 412 } 413 start_idx = cur_idx + 1; 414 415 } while (cur_idx < (count - 1)); 416 417 return count; 418 } 419 420 /* buffer is allocated and caller must free the same if returned count > 0 */ 421 static int 422 ffa_partition_probe(const uuid_t *uuid, struct ffa_partition_info **buffer) 423 { 424 int count; 425 u32 uuid0_4[4]; 426 bool reg_mode = false; 427 struct ffa_partition_info *pbuf; 428 429 if (!ffa_features(FFA_PARTITION_INFO_GET_REGS, 0, NULL, NULL)) 430 reg_mode = true; 431 432 export_uuid((u8 *)uuid0_4, uuid); 433 if (reg_mode) 434 count = __ffa_partition_info_get_regs(uuid0_4[0], uuid0_4[1], 435 uuid0_4[2], uuid0_4[3], 436 NULL, 0); 437 else 438 count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], 439 uuid0_4[2], uuid0_4[3], 440 NULL, 0); 441 if (count <= 0) 442 return count; 443 444 pbuf = kzalloc_objs(*pbuf, count); 445 if (!pbuf) 446 return -ENOMEM; 447 448 if (reg_mode) 449 count = __ffa_partition_info_get_regs(uuid0_4[0], uuid0_4[1], 450 uuid0_4[2], uuid0_4[3], 451 pbuf, count); 452 else 453 count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], 454 uuid0_4[2], uuid0_4[3], 455 pbuf, count); 456 if (count <= 0) 457 kfree(pbuf); 458 else 459 *buffer = pbuf; 460 461 return count; 462 } 463 464 #define VM_ID_MASK GENMASK(15, 0) 465 static int ffa_id_get(u16 *vm_id) 466 { 467 ffa_value_t id; 468 469 invoke_ffa_fn((ffa_value_t){ 470 .a0 = FFA_ID_GET, 471 }, &id); 472 473 if (id.a0 == FFA_ERROR) 474 return ffa_to_linux_errno((int)id.a2); 475 476 *vm_id = FIELD_GET(VM_ID_MASK, (id.a2)); 477 478 return 0; 479 } 480 481 static inline void ffa_msg_send_wait_for_completion(ffa_value_t *ret) 482 { 483 while (ret->a0 == FFA_INTERRUPT || ret->a0 == FFA_YIELD) { 484 if (ret->a0 == FFA_YIELD) 485 fsleep(1000); 486 487 invoke_ffa_fn((ffa_value_t){ 488 .a0 = FFA_RUN, .a1 = ret->a1, 489 }, ret); 490 } 491 } 492 493 static int ffa_msg_send_direct_req(u16 src_id, u16 dst_id, bool mode_32bit, 494 struct ffa_send_direct_data *data) 495 { 496 u32 req_id, resp_id, src_dst_ids = PACK_TARGET_INFO(src_id, dst_id); 497 ffa_value_t ret; 498 499 if (mode_32bit) { 500 req_id = FFA_MSG_SEND_DIRECT_REQ; 501 resp_id = FFA_MSG_SEND_DIRECT_RESP; 502 } else { 503 req_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_REQ); 504 resp_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_RESP); 505 } 506 507 invoke_ffa_fn((ffa_value_t){ 508 .a0 = req_id, .a1 = src_dst_ids, .a2 = 0, 509 .a3 = data->data0, .a4 = data->data1, .a5 = data->data2, 510 .a6 = data->data3, .a7 = data->data4, 511 }, &ret); 512 513 ffa_msg_send_wait_for_completion(&ret); 514 515 if (ret.a0 == FFA_ERROR) 516 return ffa_to_linux_errno((int)ret.a2); 517 518 if (ret.a0 == resp_id) { 519 data->data0 = ret.a3; 520 data->data1 = ret.a4; 521 data->data2 = ret.a5; 522 data->data3 = ret.a6; 523 data->data4 = ret.a7; 524 return 0; 525 } 526 527 return -EINVAL; 528 } 529 530 static int ffa_msg_send2(struct ffa_device *dev, u16 src_id, void *buf, size_t sz) 531 { 532 u32 src_dst_ids = PACK_TARGET_INFO(src_id, dev->vm_id); 533 struct ffa_indirect_msg_hdr *msg; 534 ffa_value_t ret; 535 int retval = 0; 536 537 if (sz > (drv_info->rxtx_bufsz - sizeof(*msg))) 538 return -ERANGE; 539 540 mutex_lock(&drv_info->tx_lock); 541 542 msg = drv_info->tx_buffer; 543 msg->flags = 0; 544 msg->res0 = 0; 545 msg->offset = sizeof(*msg); 546 msg->send_recv_id = src_dst_ids; 547 msg->size = sz; 548 uuid_copy(&msg->uuid, &dev->uuid); 549 memcpy((u8 *)msg + msg->offset, buf, sz); 550 551 /* flags = 0, sender VMID = 0 works for both physical/virtual NS */ 552 invoke_ffa_fn((ffa_value_t){ 553 .a0 = FFA_MSG_SEND2, .a1 = 0, .a2 = 0 554 }, &ret); 555 556 if (ret.a0 == FFA_ERROR) 557 retval = ffa_to_linux_errno((int)ret.a2); 558 559 mutex_unlock(&drv_info->tx_lock); 560 return retval; 561 } 562 563 static int ffa_msg_send_direct_req2(u16 src_id, u16 dst_id, const uuid_t *uuid, 564 struct ffa_send_direct_data2 *data) 565 { 566 u32 src_dst_ids = PACK_TARGET_INFO(src_id, dst_id); 567 union { 568 uuid_t uuid; 569 __le64 regs[2]; 570 } uuid_regs = { .uuid = *uuid }; 571 ffa_value_t ret, args = { 572 .a0 = FFA_MSG_SEND_DIRECT_REQ2, 573 .a1 = src_dst_ids, 574 .a2 = le64_to_cpu(uuid_regs.regs[0]), 575 .a3 = le64_to_cpu(uuid_regs.regs[1]), 576 }; 577 memcpy((void *)&args + offsetof(ffa_value_t, a4), data, sizeof(*data)); 578 579 invoke_ffa_fn(args, &ret); 580 581 ffa_msg_send_wait_for_completion(&ret); 582 583 if (ret.a0 == FFA_ERROR) 584 return ffa_to_linux_errno((int)ret.a2); 585 586 if (ret.a0 == FFA_MSG_SEND_DIRECT_RESP2) { 587 memcpy(data, (void *)&ret + offsetof(ffa_value_t, a4), sizeof(*data)); 588 return 0; 589 } 590 591 return -EINVAL; 592 } 593 594 static int ffa_mem_first_frag(u32 func_id, phys_addr_t buf, u32 buf_sz, 595 u32 frag_len, u32 len, u64 *handle) 596 { 597 ffa_value_t ret; 598 599 invoke_ffa_fn((ffa_value_t){ 600 .a0 = func_id, .a1 = len, .a2 = frag_len, 601 .a3 = buf, .a4 = buf_sz, 602 }, &ret); 603 604 while (ret.a0 == FFA_MEM_OP_PAUSE) 605 invoke_ffa_fn((ffa_value_t){ 606 .a0 = FFA_MEM_OP_RESUME, 607 .a1 = ret.a1, .a2 = ret.a2, 608 }, &ret); 609 610 if (ret.a0 == FFA_ERROR) 611 return ffa_to_linux_errno((int)ret.a2); 612 613 if (ret.a0 == FFA_SUCCESS) { 614 if (handle) 615 *handle = PACK_HANDLE(ret.a2, ret.a3); 616 } else if (ret.a0 == FFA_MEM_FRAG_RX) { 617 if (handle) 618 *handle = PACK_HANDLE(ret.a1, ret.a2); 619 } else { 620 return -EOPNOTSUPP; 621 } 622 623 return frag_len; 624 } 625 626 static int ffa_mem_next_frag(u64 handle, u32 frag_len) 627 { 628 ffa_value_t ret; 629 630 invoke_ffa_fn((ffa_value_t){ 631 .a0 = FFA_MEM_FRAG_TX, 632 .a1 = HANDLE_LOW(handle), .a2 = HANDLE_HIGH(handle), 633 .a3 = frag_len, 634 }, &ret); 635 636 while (ret.a0 == FFA_MEM_OP_PAUSE) 637 invoke_ffa_fn((ffa_value_t){ 638 .a0 = FFA_MEM_OP_RESUME, 639 .a1 = ret.a1, .a2 = ret.a2, 640 }, &ret); 641 642 if (ret.a0 == FFA_ERROR) 643 return ffa_to_linux_errno((int)ret.a2); 644 645 if (ret.a0 == FFA_MEM_FRAG_RX) 646 return ret.a3; 647 else if (ret.a0 == FFA_SUCCESS) 648 return 0; 649 650 return -EOPNOTSUPP; 651 } 652 653 static int 654 ffa_transmit_fragment(u32 func_id, phys_addr_t buf, u32 buf_sz, u32 frag_len, 655 u32 len, u64 *handle, bool first) 656 { 657 if (!first) 658 return ffa_mem_next_frag(*handle, frag_len); 659 660 return ffa_mem_first_frag(func_id, buf, buf_sz, frag_len, len, handle); 661 } 662 663 static u32 ffa_get_num_pages_sg(struct scatterlist *sg) 664 { 665 u32 num_pages = 0; 666 667 do { 668 num_pages += sg->length / FFA_PAGE_SIZE; 669 } while ((sg = sg_next(sg))); 670 671 return num_pages; 672 } 673 674 static u16 ffa_memory_attributes_get(u32 func_id) 675 { 676 /* 677 * For the memory lend or donate operation, if the receiver is a PE or 678 * a proxy endpoint, the owner/sender must not specify the attributes 679 */ 680 if (func_id == FFA_FN_NATIVE(MEM_LEND) || 681 func_id == FFA_MEM_LEND) 682 return 0; 683 684 return FFA_MEM_NORMAL | FFA_MEM_WRITE_BACK | FFA_MEM_INNER_SHAREABLE; 685 } 686 687 static void ffa_emad_impdef_value_init(u32 version, void *dst, void *src) 688 { 689 struct ffa_mem_region_attributes *ep_mem_access; 690 691 if (FFA_EMAD_HAS_IMPDEF_FIELD(version)) 692 memcpy(dst, src, sizeof(ep_mem_access->impdef_val)); 693 } 694 695 static void 696 ffa_mem_region_additional_setup(u32 version, struct ffa_mem_region *mem_region) 697 { 698 if (!FFA_MEM_REGION_HAS_EP_MEM_OFFSET(version)) { 699 mem_region->ep_mem_size = 0; 700 } else { 701 mem_region->ep_mem_size = ffa_emad_size_get(version); 702 mem_region->ep_mem_offset = sizeof(*mem_region); 703 memset(mem_region->reserved, 0, 12); 704 } 705 } 706 707 static int 708 ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize, 709 struct ffa_mem_ops_args *args) 710 { 711 int rc = 0; 712 bool first = true; 713 u32 composite_offset; 714 phys_addr_t addr = 0; 715 struct ffa_mem_region *mem_region = buffer; 716 struct ffa_composite_mem_region *composite; 717 struct ffa_mem_region_addr_range *constituents; 718 struct ffa_mem_region_attributes *ep_mem_access; 719 u32 idx, frag_len, length, buf_sz = 0, num_entries = sg_nents(args->sg), ep_offset; 720 u32 emad_end, emad_size = ffa_emad_size_get(drv_info->version); 721 722 mem_region->tag = args->tag; 723 mem_region->flags = args->flags; 724 mem_region->sender_id = drv_info->vm_id; 725 mem_region->attributes = ffa_memory_attributes_get(func_id); 726 727 ffa_mem_region_additional_setup(drv_info->version, mem_region); 728 composite_offset = ffa_mem_desc_offset(buffer, args->nattrs, 729 drv_info->version); 730 if (composite_offset + sizeof(*composite) > max_fragsize) 731 return -ENXIO; 732 733 for (idx = 0; idx < args->nattrs; idx++) { 734 ep_offset = ffa_mem_desc_offset(buffer, idx, drv_info->version); 735 if (check_add_overflow(ep_offset, emad_size, &emad_end)) 736 return -ENXIO; 737 738 if (emad_end > max_fragsize) 739 return -ENXIO; 740 741 ep_mem_access = buffer + ep_offset; 742 memset(ep_mem_access, 0, emad_size); 743 ep_mem_access->receiver = args->attrs[idx].receiver; 744 ep_mem_access->attrs = args->attrs[idx].attrs; 745 ep_mem_access->composite_off = composite_offset; 746 ffa_emad_impdef_value_init(drv_info->version, 747 ep_mem_access->impdef_val, 748 args->attrs[idx].impdef_val); 749 } 750 mem_region->handle = 0; 751 mem_region->ep_count = args->nattrs; 752 753 composite = buffer + composite_offset; 754 composite->total_pg_cnt = ffa_get_num_pages_sg(args->sg); 755 composite->addr_range_cnt = num_entries; 756 composite->reserved = 0; 757 758 length = composite_offset + CONSTITUENTS_OFFSET(num_entries); 759 frag_len = composite_offset + CONSTITUENTS_OFFSET(0); 760 if (frag_len > max_fragsize) 761 return -ENXIO; 762 763 if (!args->use_txbuf) { 764 addr = virt_to_phys(buffer); 765 buf_sz = max_fragsize / FFA_PAGE_SIZE; 766 } 767 768 constituents = buffer + frag_len; 769 idx = 0; 770 do { 771 if (frag_len == max_fragsize) { 772 rc = ffa_transmit_fragment(func_id, addr, buf_sz, 773 frag_len, length, 774 &args->g_handle, first); 775 if (rc < 0) 776 return -ENXIO; 777 778 first = false; 779 idx = 0; 780 frag_len = 0; 781 constituents = buffer; 782 } 783 784 if ((void *)constituents + sizeof(*constituents) - buffer > max_fragsize) { 785 pr_err("Memory Region Fragment > Tx Buffer size\n"); 786 return -EFAULT; 787 } 788 789 constituents->address = sg_phys(args->sg); 790 constituents->pg_cnt = args->sg->length / FFA_PAGE_SIZE; 791 constituents->reserved = 0; 792 constituents++; 793 frag_len += sizeof(*constituents); 794 } while ((args->sg = sg_next(args->sg))); 795 796 return ffa_transmit_fragment(func_id, addr, buf_sz, frag_len, 797 length, &args->g_handle, first); 798 } 799 800 static int ffa_memory_ops(u32 func_id, struct ffa_mem_ops_args *args) 801 { 802 int ret; 803 void *buffer; 804 size_t rxtx_bufsz = drv_info->rxtx_bufsz; 805 806 if (!args->use_txbuf) { 807 buffer = alloc_pages_exact(rxtx_bufsz, GFP_KERNEL); 808 if (!buffer) 809 return -ENOMEM; 810 } else { 811 buffer = drv_info->tx_buffer; 812 mutex_lock(&drv_info->tx_lock); 813 } 814 815 ret = ffa_setup_and_transmit(func_id, buffer, rxtx_bufsz, args); 816 817 if (args->use_txbuf) 818 mutex_unlock(&drv_info->tx_lock); 819 else 820 free_pages_exact(buffer, rxtx_bufsz); 821 822 return ret < 0 ? ret : 0; 823 } 824 825 static int ffa_memory_reclaim(u64 g_handle, u32 flags) 826 { 827 ffa_value_t ret; 828 829 invoke_ffa_fn((ffa_value_t){ 830 .a0 = FFA_MEM_RECLAIM, 831 .a1 = HANDLE_LOW(g_handle), .a2 = HANDLE_HIGH(g_handle), 832 .a3 = flags, 833 }, &ret); 834 835 if (ret.a0 == FFA_ERROR) 836 return ffa_to_linux_errno((int)ret.a2); 837 838 return 0; 839 } 840 841 static int ffa_notification_bitmap_create(void) 842 { 843 ffa_value_t ret; 844 u16 vcpu_count = nr_cpu_ids; 845 846 invoke_ffa_fn((ffa_value_t){ 847 .a0 = FFA_NOTIFICATION_BITMAP_CREATE, 848 .a1 = drv_info->vm_id, .a2 = vcpu_count, 849 }, &ret); 850 851 if (ret.a0 == FFA_ERROR) 852 return ffa_to_linux_errno((int)ret.a2); 853 854 return 0; 855 } 856 857 static int ffa_notification_bitmap_destroy(void) 858 { 859 ffa_value_t ret; 860 861 invoke_ffa_fn((ffa_value_t){ 862 .a0 = FFA_NOTIFICATION_BITMAP_DESTROY, 863 .a1 = drv_info->vm_id, 864 }, &ret); 865 866 if (ret.a0 == FFA_ERROR) 867 return ffa_to_linux_errno((int)ret.a2); 868 869 return 0; 870 } 871 872 enum notify_type { 873 SECURE_PARTITION, 874 NON_SECURE_VM, 875 SPM_FRAMEWORK, 876 NS_HYP_FRAMEWORK, 877 }; 878 879 #define NOTIFICATION_LOW_MASK GENMASK(31, 0) 880 #define NOTIFICATION_HIGH_MASK GENMASK(63, 32) 881 #define NOTIFICATION_BITMAP_HIGH(x) \ 882 ((u32)(FIELD_GET(NOTIFICATION_HIGH_MASK, (x)))) 883 #define NOTIFICATION_BITMAP_LOW(x) \ 884 ((u32)(FIELD_GET(NOTIFICATION_LOW_MASK, (x)))) 885 #define PACK_NOTIFICATION_BITMAP(low, high) \ 886 (FIELD_PREP(NOTIFICATION_LOW_MASK, (low)) | \ 887 FIELD_PREP(NOTIFICATION_HIGH_MASK, (high))) 888 889 #define RECEIVER_VCPU_MASK GENMASK(31, 16) 890 #define PACK_NOTIFICATION_GET_RECEIVER_INFO(vcpu_r, r) \ 891 (FIELD_PREP(RECEIVER_VCPU_MASK, (vcpu_r)) | \ 892 FIELD_PREP(RECEIVER_ID_MASK, (r))) 893 894 #define NOTIFICATION_INFO_GET_MORE_PEND_MASK BIT(0) 895 #define NOTIFICATION_INFO_GET_ID_COUNT GENMASK(11, 7) 896 #define ID_LIST_MASK_64 GENMASK(51, 12) 897 #define ID_LIST_MASK_32 GENMASK(31, 12) 898 #define MAX_IDS_64 20 899 #define MAX_IDS_32 10 900 901 #define PER_VCPU_NOTIFICATION_FLAG BIT(0) 902 #define SECURE_PARTITION_BITMAP_ENABLE BIT(SECURE_PARTITION) 903 #define NON_SECURE_VM_BITMAP_ENABLE BIT(NON_SECURE_VM) 904 #define SPM_FRAMEWORK_BITMAP_ENABLE BIT(SPM_FRAMEWORK) 905 #define NS_HYP_FRAMEWORK_BITMAP_ENABLE BIT(NS_HYP_FRAMEWORK) 906 #define FFA_BITMAP_SECURE_ENABLE_MASK \ 907 (SECURE_PARTITION_BITMAP_ENABLE | SPM_FRAMEWORK_BITMAP_ENABLE) 908 #define FFA_BITMAP_NS_ENABLE_MASK \ 909 (NON_SECURE_VM_BITMAP_ENABLE | NS_HYP_FRAMEWORK_BITMAP_ENABLE) 910 #define FFA_BITMAP_ALL_ENABLE_MASK \ 911 (FFA_BITMAP_SECURE_ENABLE_MASK | FFA_BITMAP_NS_ENABLE_MASK) 912 913 #define FFA_SECURE_PARTITION_ID_FLAG BIT(15) 914 915 #define SPM_FRAMEWORK_BITMAP(x) NOTIFICATION_BITMAP_LOW(x) 916 #define NS_HYP_FRAMEWORK_BITMAP(x) NOTIFICATION_BITMAP_HIGH(x) 917 #define FRAMEWORK_NOTIFY_RX_BUFFER_FULL BIT(0) 918 919 static int ffa_notification_bind_common(u16 dst_id, u64 bitmap, 920 u32 flags, bool is_bind) 921 { 922 ffa_value_t ret; 923 u32 func, src_dst_ids = PACK_TARGET_INFO(dst_id, drv_info->vm_id); 924 925 func = is_bind ? FFA_NOTIFICATION_BIND : FFA_NOTIFICATION_UNBIND; 926 927 invoke_ffa_fn((ffa_value_t){ 928 .a0 = func, .a1 = src_dst_ids, .a2 = flags, 929 .a3 = NOTIFICATION_BITMAP_LOW(bitmap), 930 .a4 = NOTIFICATION_BITMAP_HIGH(bitmap), 931 }, &ret); 932 933 if (ret.a0 == FFA_ERROR) 934 return ffa_to_linux_errno((int)ret.a2); 935 else if (ret.a0 != FFA_SUCCESS) 936 return -EINVAL; 937 938 return 0; 939 } 940 941 static 942 int ffa_notification_set(u16 src_id, u16 dst_id, u32 flags, u64 bitmap) 943 { 944 ffa_value_t ret; 945 u32 src_dst_ids = PACK_TARGET_INFO(dst_id, src_id); 946 947 invoke_ffa_fn((ffa_value_t) { 948 .a0 = FFA_NOTIFICATION_SET, .a1 = src_dst_ids, .a2 = flags, 949 .a3 = NOTIFICATION_BITMAP_LOW(bitmap), 950 .a4 = NOTIFICATION_BITMAP_HIGH(bitmap), 951 }, &ret); 952 953 if (ret.a0 == FFA_ERROR) 954 return ffa_to_linux_errno((int)ret.a2); 955 else if (ret.a0 != FFA_SUCCESS) 956 return -EINVAL; 957 958 return 0; 959 } 960 961 struct ffa_notify_bitmaps { 962 u64 sp_map; 963 u64 vm_map; 964 u64 arch_map; 965 }; 966 967 static int ffa_notification_get(u32 flags, struct ffa_notify_bitmaps *notify) 968 { 969 ffa_value_t ret; 970 u16 src_id = drv_info->vm_id; 971 u16 cpu_id = smp_processor_id(); 972 u32 rec_vcpu_ids = PACK_NOTIFICATION_GET_RECEIVER_INFO(cpu_id, src_id); 973 974 invoke_ffa_fn((ffa_value_t){ 975 .a0 = FFA_NOTIFICATION_GET, .a1 = rec_vcpu_ids, .a2 = flags, 976 }, &ret); 977 978 if (ret.a0 == FFA_ERROR) 979 return ffa_to_linux_errno((int)ret.a2); 980 else if (ret.a0 != FFA_SUCCESS) 981 return -EINVAL; /* Something else went wrong. */ 982 983 if (flags & SECURE_PARTITION_BITMAP_ENABLE) 984 notify->sp_map = PACK_NOTIFICATION_BITMAP(ret.a2, ret.a3); 985 if (flags & NON_SECURE_VM_BITMAP_ENABLE) 986 notify->vm_map = PACK_NOTIFICATION_BITMAP(ret.a4, ret.a5); 987 if (flags & SPM_FRAMEWORK_BITMAP_ENABLE) 988 notify->arch_map = SPM_FRAMEWORK_BITMAP(ret.a6); 989 if (flags & NS_HYP_FRAMEWORK_BITMAP_ENABLE) 990 notify->arch_map = PACK_NOTIFICATION_BITMAP(notify->arch_map, 991 ret.a7); 992 993 return 0; 994 } 995 996 struct ffa_dev_part_info { 997 ffa_sched_recv_cb callback; 998 void *cb_data; 999 rwlock_t rw_lock; 1000 struct ffa_device *dev; 1001 struct list_head node; 1002 }; 1003 1004 static void __do_sched_recv_cb(u16 part_id, u16 vcpu, bool is_per_vcpu) 1005 { 1006 struct ffa_dev_part_info *partition = NULL, *tmp; 1007 ffa_sched_recv_cb callback; 1008 struct list_head *phead; 1009 void *cb_data; 1010 1011 phead = xa_load(&drv_info->partition_info, part_id); 1012 if (!phead) { 1013 pr_err("%s: Invalid partition ID 0x%x\n", __func__, part_id); 1014 return; 1015 } 1016 1017 list_for_each_entry_safe(partition, tmp, phead, node) { 1018 read_lock(&partition->rw_lock); 1019 callback = partition->callback; 1020 cb_data = partition->cb_data; 1021 read_unlock(&partition->rw_lock); 1022 1023 if (callback) 1024 callback(vcpu, is_per_vcpu, cb_data); 1025 } 1026 } 1027 1028 /* 1029 * Map logical ID index to the u16 index within the packed ID list. 1030 * 1031 * For native responses (FF-A width == kernel word size), IDs are 1032 * tightly packed: idx -> idx. 1033 * 1034 * For 32-bit responses on a 64-bit kernel, each 64-bit register 1035 * contributes 4 x u16 values but only the lower 2 are defined; the 1036 * upper 2 are garbage. This mapping skips those upper halves: 1037 * 0,1,2,3,4,5,... -> 0,1,4,5,8,9,... 1038 */ 1039 static int list_idx_to_u16_idx(int idx, bool is_native_resp) 1040 { 1041 return is_native_resp ? idx : idx + 2 * (idx >> 1); 1042 } 1043 1044 static void ffa_notification_info_get(void) 1045 { 1046 int ids_processed, ids_count[MAX_IDS_64]; 1047 int idx, list, max_ids, lists_cnt; 1048 bool is_64b_resp, is_native_resp; 1049 ffa_value_t ret; 1050 u64 id_list; 1051 1052 do { 1053 invoke_ffa_fn((ffa_value_t){ 1054 .a0 = FFA_FN_NATIVE(NOTIFICATION_INFO_GET), 1055 }, &ret); 1056 1057 if (ret.a0 != FFA_FN_NATIVE(SUCCESS) && ret.a0 != FFA_SUCCESS) { 1058 if ((s32)ret.a2 != FFA_RET_NO_DATA) 1059 pr_err("Notification Info fetch failed: 0x%lx (0x%lx)", 1060 ret.a0, ret.a2); 1061 return; 1062 } 1063 1064 is_64b_resp = (ret.a0 == FFA_FN64_SUCCESS); 1065 is_native_resp = (ret.a0 == FFA_FN_NATIVE(SUCCESS)); 1066 1067 ids_processed = 0; 1068 lists_cnt = FIELD_GET(NOTIFICATION_INFO_GET_ID_COUNT, ret.a2); 1069 if (is_64b_resp) { 1070 max_ids = MAX_IDS_64; 1071 id_list = FIELD_GET(ID_LIST_MASK_64, ret.a2); 1072 } else { 1073 max_ids = MAX_IDS_32; 1074 id_list = FIELD_GET(ID_LIST_MASK_32, ret.a2); 1075 } 1076 1077 for (idx = 0; idx < lists_cnt; idx++, id_list >>= 2) 1078 ids_count[idx] = (id_list & 0x3) + 1; 1079 1080 /* Process IDs */ 1081 for (list = 0; list < lists_cnt; list++) { 1082 int u16_idx; 1083 u16 vcpu_id, part_id, *packed_id_list = (u16 *)&ret.a3; 1084 1085 if (ids_processed >= max_ids - 1) 1086 break; 1087 1088 u16_idx = list_idx_to_u16_idx(ids_processed, 1089 is_native_resp); 1090 part_id = packed_id_list[u16_idx]; 1091 ids_processed++; 1092 1093 if (ids_count[list] == 1) { /* Global Notification */ 1094 __do_sched_recv_cb(part_id, 0, false); 1095 continue; 1096 } 1097 1098 /* Per vCPU Notification */ 1099 for (idx = 1; idx < ids_count[list]; idx++) { 1100 if (ids_processed >= max_ids - 1) 1101 break; 1102 1103 u16_idx = list_idx_to_u16_idx(ids_processed, 1104 is_native_resp); 1105 vcpu_id = packed_id_list[u16_idx]; 1106 ids_processed++; 1107 1108 __do_sched_recv_cb(part_id, vcpu_id, true); 1109 } 1110 } 1111 } while (ret.a2 & NOTIFICATION_INFO_GET_MORE_PEND_MASK); 1112 } 1113 1114 static int ffa_run(struct ffa_device *dev, u16 vcpu) 1115 { 1116 ffa_value_t ret; 1117 u32 target = dev->vm_id << 16 | vcpu; 1118 1119 invoke_ffa_fn((ffa_value_t){ .a0 = FFA_RUN, .a1 = target, }, &ret); 1120 1121 while (ret.a0 == FFA_INTERRUPT) 1122 invoke_ffa_fn((ffa_value_t){ .a0 = FFA_RUN, .a1 = ret.a1, }, 1123 &ret); 1124 1125 if (ret.a0 == FFA_ERROR) 1126 return ffa_to_linux_errno((int)ret.a2); 1127 1128 return 0; 1129 } 1130 1131 static void ffa_drvinfo_flags_init(void) 1132 { 1133 if (!ffa_features(FFA_FN_NATIVE(MEM_LEND), 0, NULL, NULL) || 1134 !ffa_features(FFA_FN_NATIVE(MEM_SHARE), 0, NULL, NULL)) 1135 drv_info->mem_ops_native = true; 1136 1137 if (!ffa_features(FFA_MSG_SEND_DIRECT_REQ2, 0, NULL, NULL) || 1138 !ffa_features(FFA_MSG_SEND_DIRECT_RESP2, 0, NULL, NULL)) 1139 drv_info->msg_direct_req2_supp = true; 1140 } 1141 1142 static u32 ffa_api_version_get(void) 1143 { 1144 return drv_info->version; 1145 } 1146 1147 static int ffa_partition_info_get(const char *uuid_str, 1148 struct ffa_partition_info *buffer) 1149 { 1150 int count; 1151 uuid_t uuid; 1152 struct ffa_partition_info *pbuf; 1153 1154 if (!uuid_str || uuid_parse(uuid_str, &uuid)) { 1155 pr_err("invalid uuid (%s)\n", uuid_str); 1156 return -ENODEV; 1157 } 1158 1159 count = ffa_partition_probe(&uuid, &pbuf); 1160 if (count <= 0) 1161 return -ENOENT; 1162 1163 memcpy(buffer, pbuf, sizeof(*pbuf) * count); 1164 kfree(pbuf); 1165 return 0; 1166 } 1167 1168 static void ffa_mode_32bit_set(struct ffa_device *dev) 1169 { 1170 dev->mode_32bit = true; 1171 } 1172 1173 static int ffa_sync_send_receive(struct ffa_device *dev, 1174 struct ffa_send_direct_data *data) 1175 { 1176 return ffa_msg_send_direct_req(drv_info->vm_id, dev->vm_id, 1177 dev->mode_32bit, data); 1178 } 1179 1180 static int ffa_indirect_msg_send(struct ffa_device *dev, void *buf, size_t sz) 1181 { 1182 return ffa_msg_send2(dev, drv_info->vm_id, buf, sz); 1183 } 1184 1185 static int ffa_sync_send_receive2(struct ffa_device *dev, 1186 struct ffa_send_direct_data2 *data) 1187 { 1188 if (!drv_info->msg_direct_req2_supp) 1189 return -EOPNOTSUPP; 1190 1191 return ffa_msg_send_direct_req2(drv_info->vm_id, dev->vm_id, 1192 &dev->uuid, data); 1193 } 1194 1195 static int ffa_memory_share(struct ffa_mem_ops_args *args) 1196 { 1197 if (drv_info->mem_ops_native) 1198 return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args); 1199 1200 return ffa_memory_ops(FFA_MEM_SHARE, args); 1201 } 1202 1203 static int ffa_memory_lend(struct ffa_mem_ops_args *args) 1204 { 1205 /* Note that upon a successful MEM_LEND request the caller 1206 * must ensure that the memory region specified is not accessed 1207 * until a successful MEM_RECALIM call has been made. 1208 * On systems with a hypervisor present this will been enforced, 1209 * however on systems without a hypervisor the responsibility 1210 * falls to the calling kernel driver to prevent access. 1211 */ 1212 if (drv_info->mem_ops_native) 1213 return ffa_memory_ops(FFA_FN_NATIVE(MEM_LEND), args); 1214 1215 return ffa_memory_ops(FFA_MEM_LEND, args); 1216 } 1217 1218 #define ffa_notifications_disabled() (!drv_info->notif_enabled) 1219 1220 struct notifier_cb_info { 1221 struct hlist_node hnode; 1222 struct ffa_device *dev; 1223 ffa_fwk_notifier_cb fwk_cb; 1224 ffa_notifier_cb cb; 1225 void *cb_data; 1226 }; 1227 1228 static int 1229 ffa_sched_recv_cb_update(struct ffa_device *dev, ffa_sched_recv_cb callback, 1230 void *cb_data, bool is_registration) 1231 { 1232 struct ffa_dev_part_info *partition = NULL; 1233 struct list_head *phead; 1234 bool cb_valid; 1235 1236 if (ffa_notifications_disabled()) 1237 return -EOPNOTSUPP; 1238 1239 phead = xa_load(&drv_info->partition_info, dev->vm_id); 1240 if (!phead) { 1241 pr_err("%s: Invalid partition ID 0x%x\n", __func__, dev->vm_id); 1242 return -EINVAL; 1243 } 1244 1245 list_for_each_entry(partition, phead, node) 1246 if (partition->dev == dev) 1247 break; 1248 1249 if (&partition->node == phead) { 1250 pr_err("%s: No such partition ID 0x%x\n", __func__, dev->vm_id); 1251 return -EINVAL; 1252 } 1253 1254 write_lock(&partition->rw_lock); 1255 1256 cb_valid = !!partition->callback; 1257 if (!(is_registration ^ cb_valid)) { 1258 write_unlock(&partition->rw_lock); 1259 return -EINVAL; 1260 } 1261 1262 partition->callback = callback; 1263 partition->cb_data = cb_data; 1264 1265 write_unlock(&partition->rw_lock); 1266 return 0; 1267 } 1268 1269 static int ffa_sched_recv_cb_register(struct ffa_device *dev, 1270 ffa_sched_recv_cb cb, void *cb_data) 1271 { 1272 return ffa_sched_recv_cb_update(dev, cb, cb_data, true); 1273 } 1274 1275 static int ffa_sched_recv_cb_unregister(struct ffa_device *dev) 1276 { 1277 return ffa_sched_recv_cb_update(dev, NULL, NULL, false); 1278 } 1279 1280 static int ffa_notification_bind(u16 dst_id, u64 bitmap, u32 flags) 1281 { 1282 return ffa_notification_bind_common(dst_id, bitmap, flags, true); 1283 } 1284 1285 static int ffa_notification_unbind(u16 dst_id, u64 bitmap) 1286 { 1287 return ffa_notification_bind_common(dst_id, bitmap, 0, false); 1288 } 1289 1290 static enum notify_type ffa_notify_type_get(u16 vm_id) 1291 { 1292 if (vm_id & FFA_SECURE_PARTITION_ID_FLAG) 1293 return SECURE_PARTITION; 1294 else 1295 return NON_SECURE_VM; 1296 } 1297 1298 /* notifier_hnode_get* should be called with notify_lock held */ 1299 static struct notifier_cb_info * 1300 notifier_hnode_get_by_vmid(u16 notify_id, int vmid) 1301 { 1302 struct notifier_cb_info *node; 1303 1304 hash_for_each_possible(drv_info->notifier_hash, node, hnode, notify_id) 1305 if (node->fwk_cb && vmid == node->dev->vm_id) 1306 return node; 1307 1308 return NULL; 1309 } 1310 1311 static struct notifier_cb_info * 1312 notifier_hnode_get_by_vmid_uuid(u16 notify_id, int vmid, const uuid_t *uuid) 1313 { 1314 struct notifier_cb_info *node; 1315 1316 if (uuid_is_null(uuid)) 1317 return notifier_hnode_get_by_vmid(notify_id, vmid); 1318 1319 hash_for_each_possible(drv_info->notifier_hash, node, hnode, notify_id) 1320 if (node->fwk_cb && vmid == node->dev->vm_id && 1321 uuid_equal(&node->dev->uuid, uuid)) 1322 return node; 1323 1324 return NULL; 1325 } 1326 1327 static struct notifier_cb_info * 1328 notifier_hnode_get_by_type(u16 notify_id, enum notify_type type) 1329 { 1330 struct notifier_cb_info *node; 1331 1332 hash_for_each_possible(drv_info->notifier_hash, node, hnode, notify_id) 1333 if (node->cb && type == ffa_notify_type_get(node->dev->vm_id)) 1334 return node; 1335 1336 return NULL; 1337 } 1338 1339 static int update_notifier_cb(struct ffa_device *dev, int notify_id, 1340 struct notifier_cb_info *cb, bool is_framework) 1341 { 1342 struct notifier_cb_info *cb_info = NULL; 1343 enum notify_type type = ffa_notify_type_get(dev->vm_id); 1344 bool cb_found, is_registration = !!cb; 1345 1346 if (is_framework) 1347 cb_info = notifier_hnode_get_by_vmid_uuid(notify_id, dev->vm_id, 1348 &dev->uuid); 1349 else 1350 cb_info = notifier_hnode_get_by_type(notify_id, type); 1351 1352 cb_found = !!cb_info; 1353 1354 if (!(is_registration ^ cb_found)) 1355 return -EINVAL; 1356 1357 if (is_registration) { 1358 hash_add(drv_info->notifier_hash, &cb->hnode, notify_id); 1359 } else { 1360 hash_del(&cb_info->hnode); 1361 kfree(cb_info); 1362 } 1363 1364 return 0; 1365 } 1366 1367 static int __ffa_notify_relinquish(struct ffa_device *dev, int notify_id, 1368 bool is_framework) 1369 { 1370 int rc; 1371 1372 if (ffa_notifications_disabled()) 1373 return -EOPNOTSUPP; 1374 1375 if (notify_id >= FFA_MAX_NOTIFICATIONS) 1376 return -EINVAL; 1377 1378 write_lock(&drv_info->notify_lock); 1379 1380 rc = update_notifier_cb(dev, notify_id, NULL, is_framework); 1381 if (rc) { 1382 pr_err("Could not unregister notification callback\n"); 1383 write_unlock(&drv_info->notify_lock); 1384 return rc; 1385 } 1386 1387 if (!is_framework) 1388 rc = ffa_notification_unbind(dev->vm_id, BIT(notify_id)); 1389 1390 write_unlock(&drv_info->notify_lock); 1391 1392 return rc; 1393 } 1394 1395 static int ffa_notify_relinquish(struct ffa_device *dev, int notify_id) 1396 { 1397 return __ffa_notify_relinquish(dev, notify_id, false); 1398 } 1399 1400 static int ffa_fwk_notify_relinquish(struct ffa_device *dev, int notify_id) 1401 { 1402 return __ffa_notify_relinquish(dev, notify_id, true); 1403 } 1404 1405 static int __ffa_notify_request(struct ffa_device *dev, bool is_per_vcpu, 1406 void *cb, void *cb_data, 1407 int notify_id, bool is_framework) 1408 { 1409 int rc; 1410 u32 flags = 0; 1411 struct notifier_cb_info *cb_info = NULL; 1412 1413 if (ffa_notifications_disabled()) 1414 return -EOPNOTSUPP; 1415 1416 if (notify_id >= FFA_MAX_NOTIFICATIONS) 1417 return -EINVAL; 1418 1419 cb_info = kzalloc_obj(*cb_info); 1420 if (!cb_info) 1421 return -ENOMEM; 1422 1423 cb_info->dev = dev; 1424 cb_info->cb_data = cb_data; 1425 if (is_framework) 1426 cb_info->fwk_cb = cb; 1427 else 1428 cb_info->cb = cb; 1429 1430 write_lock(&drv_info->notify_lock); 1431 1432 if (!is_framework) { 1433 if (is_per_vcpu) 1434 flags = PER_VCPU_NOTIFICATION_FLAG; 1435 1436 rc = ffa_notification_bind(dev->vm_id, BIT(notify_id), flags); 1437 if (rc) 1438 goto out_unlock_free; 1439 } 1440 1441 rc = update_notifier_cb(dev, notify_id, cb_info, is_framework); 1442 if (rc) { 1443 pr_err("Failed to register callback for %d - %d\n", 1444 notify_id, rc); 1445 if (!is_framework) 1446 ffa_notification_unbind(dev->vm_id, BIT(notify_id)); 1447 } 1448 1449 out_unlock_free: 1450 write_unlock(&drv_info->notify_lock); 1451 if (rc) 1452 kfree(cb_info); 1453 1454 return rc; 1455 } 1456 1457 static int ffa_notify_request(struct ffa_device *dev, bool is_per_vcpu, 1458 ffa_notifier_cb cb, void *cb_data, int notify_id) 1459 { 1460 return __ffa_notify_request(dev, is_per_vcpu, cb, cb_data, notify_id, 1461 false); 1462 } 1463 1464 static int 1465 ffa_fwk_notify_request(struct ffa_device *dev, ffa_fwk_notifier_cb cb, 1466 void *cb_data, int notify_id) 1467 { 1468 return __ffa_notify_request(dev, false, cb, cb_data, notify_id, true); 1469 } 1470 1471 static int ffa_notify_send(struct ffa_device *dev, int notify_id, 1472 bool is_per_vcpu, u16 vcpu) 1473 { 1474 u32 flags = 0; 1475 1476 if (ffa_notifications_disabled()) 1477 return -EOPNOTSUPP; 1478 1479 if (is_per_vcpu) 1480 flags |= (PER_VCPU_NOTIFICATION_FLAG | vcpu << 16); 1481 1482 return ffa_notification_set(dev->vm_id, drv_info->vm_id, flags, 1483 BIT(notify_id)); 1484 } 1485 1486 static void handle_notif_callbacks(u64 bitmap, enum notify_type type) 1487 { 1488 ffa_notifier_cb cb; 1489 void *cb_data; 1490 int notify_id; 1491 1492 for (notify_id = 0; notify_id <= FFA_MAX_NOTIFICATIONS && bitmap; 1493 notify_id++, bitmap >>= 1) { 1494 if (!(bitmap & 1)) 1495 continue; 1496 1497 scoped_guard(read_lock, &drv_info->notify_lock) { 1498 struct notifier_cb_info *cb_info; 1499 1500 cb_info = notifier_hnode_get_by_type(notify_id, type); 1501 cb = cb_info ? cb_info->cb : NULL; 1502 cb_data = cb_info ? cb_info->cb_data : NULL; 1503 } 1504 1505 if (cb) 1506 cb(notify_id, cb_data); 1507 } 1508 } 1509 1510 static void handle_fwk_notif_callbacks(u32 bitmap) 1511 { 1512 void *buf; 1513 uuid_t uuid; 1514 void *fwk_cb_data; 1515 int notify_id = 0, target; 1516 ffa_fwk_notifier_cb fwk_cb; 1517 struct ffa_indirect_msg_hdr *msg; 1518 size_t min_offset = offsetof(struct ffa_indirect_msg_hdr, uuid); 1519 1520 /* Only one framework notification defined and supported for now */ 1521 if (!(bitmap & FRAMEWORK_NOTIFY_RX_BUFFER_FULL)) 1522 return; 1523 1524 scoped_guard(mutex, &drv_info->rx_lock) { 1525 u32 offset, size; 1526 1527 msg = drv_info->rx_buffer; 1528 offset = msg->offset; 1529 size = msg->size; 1530 1531 if (!size || (offset != min_offset && offset < sizeof(*msg)) || 1532 offset > drv_info->rxtx_bufsz || 1533 size > drv_info->rxtx_bufsz - offset) { 1534 pr_err("invalid framework notification message\n"); 1535 ffa_rx_release(); 1536 return; 1537 } 1538 1539 buf = kmemdup((void *)msg + offset, size, GFP_KERNEL); 1540 if (!buf) { 1541 ffa_rx_release(); 1542 return; 1543 } 1544 1545 target = SENDER_ID(msg->send_recv_id); 1546 if (offset >= sizeof(*msg)) 1547 uuid_copy(&uuid, &msg->uuid); 1548 else 1549 uuid_copy(&uuid, &uuid_null); 1550 ffa_rx_release(); 1551 } 1552 1553 scoped_guard(read_lock, &drv_info->notify_lock) { 1554 struct notifier_cb_info *cb_info; 1555 1556 cb_info = notifier_hnode_get_by_vmid_uuid(notify_id, target, 1557 &uuid); 1558 fwk_cb = cb_info ? cb_info->fwk_cb : NULL; 1559 fwk_cb_data = cb_info ? cb_info->cb_data : NULL; 1560 } 1561 1562 if (fwk_cb) 1563 fwk_cb(notify_id, fwk_cb_data, buf); 1564 kfree(buf); 1565 } 1566 1567 static void notif_get_and_handle(void *cb_data) 1568 { 1569 int rc; 1570 u32 flags; 1571 struct ffa_drv_info *info = cb_data; 1572 struct ffa_notify_bitmaps bitmaps = { 0 }; 1573 1574 if (info->vm_id == 0) /* Non secure physical instance */ 1575 flags = FFA_BITMAP_SECURE_ENABLE_MASK; 1576 else 1577 flags = FFA_BITMAP_ALL_ENABLE_MASK; 1578 1579 rc = ffa_notification_get(flags, &bitmaps); 1580 if (rc) { 1581 pr_err("Failed to retrieve notifications with %d!\n", rc); 1582 return; 1583 } 1584 1585 handle_fwk_notif_callbacks(SPM_FRAMEWORK_BITMAP(bitmaps.arch_map)); 1586 handle_fwk_notif_callbacks(NS_HYP_FRAMEWORK_BITMAP(bitmaps.arch_map)); 1587 handle_notif_callbacks(bitmaps.vm_map, NON_SECURE_VM); 1588 handle_notif_callbacks(bitmaps.sp_map, SECURE_PARTITION); 1589 } 1590 1591 static void 1592 ffa_self_notif_handle(u16 vcpu, bool is_per_vcpu, void *cb_data) 1593 { 1594 struct ffa_drv_info *info = cb_data; 1595 1596 if (!is_per_vcpu) 1597 notif_get_and_handle(info); 1598 else 1599 smp_call_function_single(vcpu, notif_get_and_handle, info, 0); 1600 } 1601 1602 static void notif_pcpu_irq_work_fn(struct work_struct *work) 1603 { 1604 struct ffa_pcpu_irq *pcpu = container_of(work, struct ffa_pcpu_irq, 1605 notif_pcpu_work); 1606 struct ffa_drv_info *info = pcpu->info; 1607 1608 notif_get_and_handle(info); 1609 } 1610 1611 static const struct ffa_info_ops ffa_drv_info_ops = { 1612 .api_version_get = ffa_api_version_get, 1613 .partition_info_get = ffa_partition_info_get, 1614 }; 1615 1616 static const struct ffa_msg_ops ffa_drv_msg_ops = { 1617 .mode_32bit_set = ffa_mode_32bit_set, 1618 .sync_send_receive = ffa_sync_send_receive, 1619 .indirect_send = ffa_indirect_msg_send, 1620 .sync_send_receive2 = ffa_sync_send_receive2, 1621 }; 1622 1623 static const struct ffa_mem_ops ffa_drv_mem_ops = { 1624 .memory_reclaim = ffa_memory_reclaim, 1625 .memory_share = ffa_memory_share, 1626 .memory_lend = ffa_memory_lend, 1627 }; 1628 1629 static const struct ffa_cpu_ops ffa_drv_cpu_ops = { 1630 .run = ffa_run, 1631 }; 1632 1633 static const struct ffa_notifier_ops ffa_drv_notifier_ops = { 1634 .sched_recv_cb_register = ffa_sched_recv_cb_register, 1635 .sched_recv_cb_unregister = ffa_sched_recv_cb_unregister, 1636 .notify_request = ffa_notify_request, 1637 .notify_relinquish = ffa_notify_relinquish, 1638 .fwk_notify_request = ffa_fwk_notify_request, 1639 .fwk_notify_relinquish = ffa_fwk_notify_relinquish, 1640 .notify_send = ffa_notify_send, 1641 }; 1642 1643 static const struct ffa_ops ffa_drv_ops = { 1644 .info_ops = &ffa_drv_info_ops, 1645 .msg_ops = &ffa_drv_msg_ops, 1646 .mem_ops = &ffa_drv_mem_ops, 1647 .cpu_ops = &ffa_drv_cpu_ops, 1648 .notifier_ops = &ffa_drv_notifier_ops, 1649 }; 1650 1651 void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid) 1652 { 1653 int count, idx; 1654 struct ffa_partition_info *pbuf, *tpbuf; 1655 1656 count = ffa_partition_probe(uuid, &pbuf); 1657 if (count <= 0) 1658 return; 1659 1660 for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) 1661 if (tpbuf->id == ffa_dev->vm_id) 1662 uuid_copy(&ffa_dev->uuid, uuid); 1663 kfree(pbuf); 1664 } 1665 1666 static int 1667 ffa_bus_notifier(struct notifier_block *nb, unsigned long action, void *data) 1668 { 1669 struct device *dev = data; 1670 struct ffa_device *fdev = to_ffa_dev(dev); 1671 1672 if (action == BUS_NOTIFY_BIND_DRIVER) { 1673 struct ffa_driver *ffa_drv = to_ffa_driver(dev->driver); 1674 const struct ffa_device_id *id_table = ffa_drv->id_table; 1675 1676 /* 1677 * FF-A v1.1 provides UUID for each partition as part of the 1678 * discovery API, the discovered UUID must be populated in the 1679 * device's UUID and there is no need to workaround by copying 1680 * the same from the driver table. 1681 */ 1682 if (uuid_is_null(&fdev->uuid)) 1683 ffa_device_match_uuid(fdev, &id_table->uuid); 1684 1685 return NOTIFY_OK; 1686 } 1687 1688 return NOTIFY_DONE; 1689 } 1690 1691 static struct notifier_block ffa_bus_nb = { 1692 .notifier_call = ffa_bus_notifier, 1693 }; 1694 1695 static void ffa_bus_notifier_unregister(void) 1696 { 1697 if (!drv_info->bus_notifier_registered) 1698 return; 1699 1700 bus_unregister_notifier(&ffa_bus_type, &ffa_bus_nb); 1701 drv_info->bus_notifier_registered = false; 1702 } 1703 1704 static int ffa_xa_add_partition_info(struct ffa_device *dev) 1705 { 1706 struct ffa_dev_part_info *info; 1707 struct list_head *head, *phead; 1708 int ret = -ENOMEM; 1709 1710 phead = xa_load(&drv_info->partition_info, dev->vm_id); 1711 if (phead) { 1712 head = phead; 1713 list_for_each_entry(info, head, node) { 1714 if (info->dev == dev) { 1715 pr_err("%s: duplicate dev %p part ID 0x%x\n", 1716 __func__, dev, dev->vm_id); 1717 return -EEXIST; 1718 } 1719 } 1720 } 1721 1722 info = kzalloc_obj(*info); 1723 if (!info) 1724 return ret; 1725 1726 rwlock_init(&info->rw_lock); 1727 info->dev = dev; 1728 1729 if (!phead) { 1730 phead = kzalloc_obj(*phead); 1731 if (!phead) 1732 goto free_out; 1733 1734 INIT_LIST_HEAD(phead); 1735 1736 ret = xa_insert(&drv_info->partition_info, dev->vm_id, phead, 1737 GFP_KERNEL); 1738 if (ret) { 1739 pr_err("%s: failed to save part ID 0x%x Ret:%d\n", 1740 __func__, dev->vm_id, ret); 1741 goto free_out; 1742 } 1743 } 1744 list_add(&info->node, phead); 1745 return 0; 1746 1747 free_out: 1748 kfree(phead); 1749 kfree(info); 1750 return ret; 1751 } 1752 1753 static int ffa_setup_host_partition(int vm_id) 1754 { 1755 struct ffa_partition_info buf = { 0 }; 1756 struct ffa_device *ffa_dev; 1757 int ret; 1758 1759 buf.id = vm_id; 1760 ffa_dev = ffa_device_register(&buf, &ffa_drv_ops, &ffa_pdev->dev); 1761 if (!ffa_dev) { 1762 pr_err("%s: failed to register host partition ID 0x%x\n", 1763 __func__, vm_id); 1764 return -EINVAL; 1765 } 1766 1767 ret = ffa_xa_add_partition_info(ffa_dev); 1768 if (ret) 1769 return ret; 1770 1771 if (ffa_notifications_disabled()) 1772 return 0; 1773 1774 ret = ffa_sched_recv_cb_update(ffa_dev, ffa_self_notif_handle, 1775 drv_info, true); 1776 if (ret) 1777 pr_info("Failed to register driver sched callback %d\n", ret); 1778 1779 return ret; 1780 } 1781 1782 static void ffa_partitions_cleanup(void) 1783 { 1784 struct list_head *phead; 1785 unsigned long idx; 1786 1787 ffa_bus_notifier_unregister(); 1788 1789 /* Clean up/free all registered devices */ 1790 ffa_devices_unregister(); 1791 1792 xa_for_each(&drv_info->partition_info, idx, phead) { 1793 struct ffa_dev_part_info *info, *tmp; 1794 1795 xa_erase(&drv_info->partition_info, idx); 1796 list_for_each_entry_safe(info, tmp, phead, node) { 1797 list_del(&info->node); 1798 kfree(info); 1799 } 1800 kfree(phead); 1801 } 1802 1803 xa_destroy(&drv_info->partition_info); 1804 } 1805 1806 static int ffa_setup_partitions(void) 1807 { 1808 int count, idx, ret; 1809 struct ffa_device *ffa_dev; 1810 struct ffa_partition_info *pbuf, *tpbuf; 1811 1812 if (!FFA_PART_INFO_HAS_UUID_IN_RESP(drv_info->version)) { 1813 ret = bus_register_notifier(&ffa_bus_type, &ffa_bus_nb); 1814 if (ret) 1815 pr_err("Failed to register FF-A bus notifiers\n"); 1816 else 1817 drv_info->bus_notifier_registered = true; 1818 } 1819 1820 count = ffa_partition_probe(&uuid_null, &pbuf); 1821 if (count <= 0) { 1822 pr_info("%s: No partitions found, error %d\n", __func__, count); 1823 ffa_bus_notifier_unregister(); 1824 return -EINVAL; 1825 } 1826 1827 xa_init(&drv_info->partition_info); 1828 for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) { 1829 /* Note that if the UUID will be uuid_null, that will require 1830 * ffa_bus_notifier() to find the UUID of this partition id 1831 * with help of ffa_device_match_uuid(). FF-A v1.1 and above 1832 * provides UUID here for each partition as part of the 1833 * discovery API and the same is passed. 1834 */ 1835 ffa_dev = ffa_device_register(tpbuf, &ffa_drv_ops, 1836 &ffa_pdev->dev); 1837 if (!ffa_dev) { 1838 pr_err("%s: failed to register partition ID 0x%x\n", 1839 __func__, tpbuf->id); 1840 continue; 1841 } 1842 1843 if (FFA_PART_INFO_HAS_EXEC_STATE_IN_RESP(drv_info->version) && 1844 !(tpbuf->properties & FFA_PARTITION_AARCH64_EXEC)) 1845 ffa_mode_32bit_set(ffa_dev); 1846 1847 if (ffa_xa_add_partition_info(ffa_dev)) { 1848 ffa_device_unregister(ffa_dev); 1849 continue; 1850 } 1851 } 1852 1853 kfree(pbuf); 1854 1855 /* 1856 * Check if the host is already added as part of partition info 1857 * No multiple UUID possible for the host, so just checking if 1858 * there is an entry will suffice 1859 */ 1860 if (xa_load(&drv_info->partition_info, drv_info->vm_id)) 1861 return 0; 1862 1863 /* Allocate for the host */ 1864 ret = ffa_setup_host_partition(drv_info->vm_id); 1865 if (ret) 1866 ffa_partitions_cleanup(); 1867 1868 return ret; 1869 } 1870 1871 /* FFA FEATURE IDs */ 1872 #define FFA_FEAT_NOTIFICATION_PENDING_INT (1) 1873 #define FFA_FEAT_SCHEDULE_RECEIVER_INT (2) 1874 #define FFA_FEAT_MANAGED_EXIT_INT (3) 1875 1876 static irqreturn_t ffa_sched_recv_irq_handler(int irq, void *irq_data) 1877 { 1878 struct ffa_pcpu_irq *pcpu = irq_data; 1879 struct ffa_drv_info *info = pcpu->info; 1880 1881 queue_work(info->notif_pcpu_wq, &info->sched_recv_irq_work); 1882 1883 return IRQ_HANDLED; 1884 } 1885 1886 static irqreturn_t notif_pend_irq_handler(int irq, void *irq_data) 1887 { 1888 struct ffa_pcpu_irq *pcpu = irq_data; 1889 struct ffa_drv_info *info = pcpu->info; 1890 1891 queue_work_on(smp_processor_id(), info->notif_pcpu_wq, 1892 &pcpu->notif_pcpu_work); 1893 1894 return IRQ_HANDLED; 1895 } 1896 1897 static void ffa_sched_recv_irq_work_fn(struct work_struct *work) 1898 { 1899 ffa_notification_info_get(); 1900 } 1901 1902 static int ffa_irq_map(u32 id) 1903 { 1904 char *err_str; 1905 int ret, irq, intid; 1906 1907 if (id == FFA_FEAT_NOTIFICATION_PENDING_INT) 1908 err_str = "Notification Pending Interrupt"; 1909 else if (id == FFA_FEAT_SCHEDULE_RECEIVER_INT) 1910 err_str = "Schedule Receiver Interrupt"; 1911 else 1912 err_str = "Unknown ID"; 1913 1914 /* The returned intid is assumed to be SGI donated to NS world */ 1915 ret = ffa_features(id, 0, &intid, NULL); 1916 if (ret < 0) { 1917 if (ret != -EOPNOTSUPP) 1918 pr_err("Failed to retrieve FF-A %s %u\n", err_str, id); 1919 return ret; 1920 } 1921 1922 if (acpi_disabled) { 1923 struct of_phandle_args oirq = {}; 1924 struct device_node *gic; 1925 1926 /* Only GICv3 supported currently with the device tree */ 1927 gic = of_find_compatible_node(NULL, NULL, "arm,gic-v3"); 1928 if (!gic) 1929 return -ENXIO; 1930 1931 oirq.np = gic; 1932 oirq.args_count = 1; 1933 oirq.args[0] = intid; 1934 irq = irq_create_of_mapping(&oirq); 1935 of_node_put(gic); 1936 #ifdef CONFIG_ACPI 1937 } else { 1938 irq = acpi_register_gsi(NULL, intid, ACPI_EDGE_SENSITIVE, 1939 ACPI_ACTIVE_HIGH); 1940 #endif 1941 } 1942 1943 if (irq <= 0) { 1944 pr_err("Failed to create IRQ mapping!\n"); 1945 return -ENODATA; 1946 } 1947 1948 return irq; 1949 } 1950 1951 static void ffa_irq_unmap(unsigned int irq) 1952 { 1953 if (!irq) 1954 return; 1955 irq_dispose_mapping(irq); 1956 } 1957 1958 static int ffa_cpuhp_pcpu_irq_enable(unsigned int cpu) 1959 { 1960 if (drv_info->sched_recv_irq) 1961 enable_percpu_irq(drv_info->sched_recv_irq, IRQ_TYPE_NONE); 1962 if (drv_info->notif_pend_irq) 1963 enable_percpu_irq(drv_info->notif_pend_irq, IRQ_TYPE_NONE); 1964 return 0; 1965 } 1966 1967 static int ffa_cpuhp_pcpu_irq_disable(unsigned int cpu) 1968 { 1969 if (drv_info->sched_recv_irq) 1970 disable_percpu_irq(drv_info->sched_recv_irq); 1971 if (drv_info->notif_pend_irq) 1972 disable_percpu_irq(drv_info->notif_pend_irq); 1973 return 0; 1974 } 1975 1976 static void ffa_uninit_pcpu_irq(void) 1977 { 1978 if (drv_info->cpuhp_state) { 1979 cpuhp_remove_state(drv_info->cpuhp_state); 1980 drv_info->cpuhp_state = 0; 1981 } 1982 1983 if (drv_info->notif_pcpu_wq) { 1984 destroy_workqueue(drv_info->notif_pcpu_wq); 1985 drv_info->notif_pcpu_wq = NULL; 1986 } 1987 1988 if (drv_info->sched_recv_irq) 1989 free_percpu_irq(drv_info->sched_recv_irq, drv_info->irq_pcpu); 1990 1991 if (drv_info->notif_pend_irq) 1992 free_percpu_irq(drv_info->notif_pend_irq, drv_info->irq_pcpu); 1993 1994 if (drv_info->irq_pcpu) { 1995 free_percpu(drv_info->irq_pcpu); 1996 drv_info->irq_pcpu = NULL; 1997 } 1998 } 1999 2000 static int ffa_init_pcpu_irq(void) 2001 { 2002 struct ffa_pcpu_irq __percpu *irq_pcpu; 2003 int ret, cpu; 2004 2005 irq_pcpu = alloc_percpu(struct ffa_pcpu_irq); 2006 if (!irq_pcpu) 2007 return -ENOMEM; 2008 2009 for_each_present_cpu(cpu) { 2010 per_cpu_ptr(irq_pcpu, cpu)->info = drv_info; 2011 INIT_WORK(&per_cpu_ptr(irq_pcpu, cpu)->notif_pcpu_work, 2012 notif_pcpu_irq_work_fn); 2013 } 2014 2015 drv_info->irq_pcpu = irq_pcpu; 2016 2017 if (drv_info->sched_recv_irq) { 2018 ret = request_percpu_irq(drv_info->sched_recv_irq, 2019 ffa_sched_recv_irq_handler, 2020 "ARM-FFA-SRI", irq_pcpu); 2021 if (ret) { 2022 pr_err("Error registering percpu SRI nIRQ %d : %d\n", 2023 drv_info->sched_recv_irq, ret); 2024 drv_info->sched_recv_irq = 0; 2025 return ret; 2026 } 2027 } 2028 2029 if (drv_info->notif_pend_irq) { 2030 ret = request_percpu_irq(drv_info->notif_pend_irq, 2031 notif_pend_irq_handler, 2032 "ARM-FFA-NPI", irq_pcpu); 2033 if (ret) { 2034 pr_err("Error registering percpu NPI nIRQ %d : %d\n", 2035 drv_info->notif_pend_irq, ret); 2036 drv_info->notif_pend_irq = 0; 2037 return ret; 2038 } 2039 } 2040 2041 INIT_WORK(&drv_info->sched_recv_irq_work, ffa_sched_recv_irq_work_fn); 2042 drv_info->notif_pcpu_wq = create_workqueue("ffa_pcpu_irq_notification"); 2043 if (!drv_info->notif_pcpu_wq) 2044 return -EINVAL; 2045 2046 ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ffa/pcpu-irq:starting", 2047 ffa_cpuhp_pcpu_irq_enable, 2048 ffa_cpuhp_pcpu_irq_disable); 2049 2050 if (ret < 0) 2051 return ret; 2052 2053 drv_info->cpuhp_state = ret; 2054 return 0; 2055 } 2056 2057 static void ffa_notifications_cleanup(void) 2058 { 2059 ffa_uninit_pcpu_irq(); 2060 ffa_irq_unmap(drv_info->sched_recv_irq); 2061 drv_info->sched_recv_irq = 0; 2062 ffa_irq_unmap(drv_info->notif_pend_irq); 2063 drv_info->notif_pend_irq = 0; 2064 2065 if (drv_info->bitmap_created) { 2066 ffa_notification_bitmap_destroy(); 2067 drv_info->bitmap_created = false; 2068 } 2069 drv_info->notif_enabled = false; 2070 } 2071 2072 static void ffa_notifications_setup(void) 2073 { 2074 int ret; 2075 2076 ret = ffa_features(FFA_NOTIFICATION_BITMAP_CREATE, 0, NULL, NULL); 2077 if (!ret) { 2078 ret = ffa_notification_bitmap_create(); 2079 if (ret) { 2080 pr_err("Notification bitmap create error %d\n", ret); 2081 return; 2082 } 2083 2084 drv_info->bitmap_created = true; 2085 } 2086 2087 ret = ffa_irq_map(FFA_FEAT_SCHEDULE_RECEIVER_INT); 2088 if (ret > 0) 2089 drv_info->sched_recv_irq = ret; 2090 2091 ret = ffa_irq_map(FFA_FEAT_NOTIFICATION_PENDING_INT); 2092 if (ret > 0) 2093 drv_info->notif_pend_irq = ret; 2094 2095 if (!drv_info->sched_recv_irq && !drv_info->notif_pend_irq) 2096 goto cleanup; 2097 2098 ret = ffa_init_pcpu_irq(); 2099 if (ret) 2100 goto cleanup; 2101 2102 hash_init(drv_info->notifier_hash); 2103 rwlock_init(&drv_info->notify_lock); 2104 2105 drv_info->notif_enabled = true; 2106 return; 2107 cleanup: 2108 pr_info("Notification setup failed %d, not enabled\n", ret); 2109 ffa_notifications_cleanup(); 2110 } 2111 2112 static int ffa_probe(struct platform_device *pdev) 2113 { 2114 int ret; 2115 u32 buf_sz; 2116 size_t rxtx_min_bufsz = SZ_4K, rxtx_max_bufsz = 0, rxtx_bufsz; 2117 2118 if (IS_BUILTIN(CONFIG_ARM_FFA_TRANSPORT) && 2119 is_protected_kvm_enabled() && !is_pkvm_initialized()) 2120 return -EPROBE_DEFER; 2121 2122 ret = ffa_transport_init(&invoke_ffa_fn); 2123 if (ret) 2124 return ret == -EOPNOTSUPP ? -ENODEV : ret; 2125 2126 drv_info = kzalloc_obj(*drv_info); 2127 if (!drv_info) 2128 return -ENOMEM; 2129 platform_set_drvdata(pdev, drv_info); 2130 2131 ret = ffa_version_check(&drv_info->version); 2132 if (ret) { 2133 if (ret == -EOPNOTSUPP) 2134 ret = -ENODEV; 2135 goto free_drv_info; 2136 } 2137 2138 if (ffa_id_get(&drv_info->vm_id)) { 2139 pr_err("failed to obtain VM id for self\n"); 2140 ret = -ENODEV; 2141 goto free_drv_info; 2142 } 2143 2144 ret = ffa_features(FFA_FN_NATIVE(RXTX_MAP), 0, &buf_sz, NULL); 2145 if (!ret) { 2146 if (RXTX_MAP_MIN_BUFSZ(buf_sz) == 1) 2147 rxtx_min_bufsz = SZ_64K; 2148 else if (RXTX_MAP_MIN_BUFSZ(buf_sz) == 2) 2149 rxtx_min_bufsz = SZ_16K; 2150 else 2151 rxtx_min_bufsz = SZ_4K; 2152 2153 rxtx_max_bufsz = RXTX_MAP_MAX_BUFSZ(buf_sz) * SZ_4K; 2154 if (rxtx_max_bufsz != 0 && rxtx_max_bufsz < rxtx_min_bufsz) 2155 rxtx_max_bufsz = rxtx_min_bufsz; 2156 } 2157 2158 rxtx_bufsz = min_not_zero(PAGE_ALIGN(rxtx_min_bufsz), rxtx_max_bufsz); 2159 drv_info->rx_buffer = alloc_pages_exact(rxtx_bufsz, GFP_KERNEL); 2160 if (!drv_info->rx_buffer) { 2161 ret = -ENOMEM; 2162 goto free_drv_info; 2163 } 2164 2165 drv_info->tx_buffer = alloc_pages_exact(rxtx_bufsz, GFP_KERNEL); 2166 if (!drv_info->tx_buffer) { 2167 ret = -ENOMEM; 2168 goto free_pages; 2169 } 2170 2171 ret = ffa_rxtx_map(virt_to_phys(drv_info->tx_buffer), 2172 virt_to_phys(drv_info->rx_buffer), 2173 rxtx_bufsz / FFA_PAGE_SIZE); 2174 if (ret == -EINVAL && !rxtx_max_bufsz && rxtx_min_bufsz < rxtx_bufsz) { 2175 rxtx_bufsz = rxtx_min_bufsz; 2176 ret = ffa_rxtx_map(virt_to_phys(drv_info->tx_buffer), 2177 virt_to_phys(drv_info->rx_buffer), 2178 rxtx_bufsz / FFA_PAGE_SIZE); 2179 } 2180 if (ret) { 2181 pr_err("failed to register FFA RxTx buffers\n"); 2182 goto free_pages; 2183 } 2184 drv_info->rxtx_bufsz = rxtx_bufsz; 2185 2186 mutex_init(&drv_info->rx_lock); 2187 mutex_init(&drv_info->tx_lock); 2188 2189 ffa_drvinfo_flags_init(); 2190 2191 ffa_notifications_setup(); 2192 2193 ret = ffa_setup_partitions(); 2194 if (!ret) 2195 return ret; 2196 2197 pr_err("failed to setup partitions\n"); 2198 ffa_notifications_cleanup(); 2199 ffa_rxtx_unmap(); 2200 free_pages: 2201 if (drv_info->tx_buffer) 2202 free_pages_exact(drv_info->tx_buffer, rxtx_bufsz); 2203 free_pages_exact(drv_info->rx_buffer, rxtx_bufsz); 2204 free_drv_info: 2205 platform_set_drvdata(pdev, NULL); 2206 kfree(drv_info); 2207 drv_info = NULL; 2208 return ret; 2209 } 2210 2211 static void ffa_remove(struct platform_device *pdev) 2212 { 2213 struct ffa_drv_info *info = platform_get_drvdata(pdev); 2214 2215 ffa_notifications_cleanup(); 2216 ffa_partitions_cleanup(); 2217 ffa_rxtx_unmap(); 2218 free_pages_exact(info->tx_buffer, info->rxtx_bufsz); 2219 free_pages_exact(info->rx_buffer, info->rxtx_bufsz); 2220 kfree(info); 2221 platform_set_drvdata(pdev, NULL); 2222 drv_info = NULL; 2223 } 2224 2225 static struct platform_driver ffa_driver = { 2226 .probe = ffa_probe, 2227 .remove = ffa_remove, 2228 .driver = { 2229 .name = FFA_PLATFORM_NAME, 2230 }, 2231 }; 2232 2233 static int __init ffa_init(void) 2234 { 2235 int ret; 2236 2237 ffa_pdev = platform_device_register_simple(FFA_PLATFORM_NAME, 2238 PLATFORM_DEVID_NONE, 2239 NULL, 0); 2240 if (IS_ERR(ffa_pdev)) 2241 return PTR_ERR(ffa_pdev); 2242 2243 ret = platform_driver_register(&ffa_driver); 2244 if (ret) 2245 platform_device_unregister(ffa_pdev); 2246 2247 return ret; 2248 } 2249 module_init(ffa_init); 2250 2251 static void __exit ffa_exit(void) 2252 { 2253 platform_device_unregister(ffa_pdev); 2254 platform_driver_unregister(&ffa_driver); 2255 } 2256 module_exit(ffa_exit); 2257 2258 MODULE_ALIAS("arm-ffa"); 2259 MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>"); 2260 MODULE_DESCRIPTION("Arm FF-A interface driver"); 2261 MODULE_LICENSE("GPL v2"); 2262