drivers/firmware/stratix10-svc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2017-2018, Intel Corporation
   4  */
   5
   6 #include <linux/completion.h>
   7 #include <linux/delay.h>
   8 #include <linux/genalloc.h>
   9 #include <linux/io.h>
  10 #include <linux/kfifo.h>
  11 #include <linux/kthread.h>
  12 #include <linux/module.h>
  13 #include <linux/mutex.h>
  14 #include <linux/of.h>
  15 #include <linux/of_platform.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/slab.h>
  18 #include <linux/spinlock.h>
  19 #include <linux/firmware/intel/stratix10-smc.h>
  20 #include <linux/firmware/intel/stratix10-svc-client.h>
  21 #include <linux/types.h>
  22
  23 /**
  24  * SVC_NUM_DATA_IN_FIFO - number of struct stratix10_svc_data in the FIFO
  25  *
  26  * SVC_NUM_CHANNEL - number of channel supported by service layer driver
  27  *
  28  * FPGA_CONFIG_DATA_CLAIM_TIMEOUT_MS - claim back the submitted buffer(s)
  29  * from the secure world for FPGA manager to reuse, or to free the buffer(s)
  30  * when all bit-stream data had be send.
  31  *
  32  * FPGA_CONFIG_STATUS_TIMEOUT_SEC - poll the FPGA configuration status,
  33  * service layer will return error to FPGA manager when timeout occurs,
  34  * timeout is set to 30 seconds (30 * 1000) at Intel Stratix10 SoC.
  35  */
  36 #define SVC_NUM_DATA_IN_FIFO                    32
  37 #define SVC_NUM_CHANNEL                         2
  38 #define FPGA_CONFIG_DATA_CLAIM_TIMEOUT_MS       200
  39 #define FPGA_CONFIG_STATUS_TIMEOUT_SEC          30
  40
  41 /* stratix10 service layer clients */
  42 #define STRATIX10_RSU                           "stratix10-rsu"
  43
  44 typedef void (svc_invoke_fn)(unsigned long, unsigned long, unsigned long,
  45                              unsigned long, unsigned long, unsigned long,
  46                              unsigned long, unsigned long,
  47                              struct arm_smccc_res *);
  48 struct stratix10_svc_chan;
  49
  50 /**
  51  * struct stratix10_svc - svc private data
  52  * @stratix10_svc_rsu: pointer to stratix10 RSU device
  53  */
  54 struct stratix10_svc {
  55         struct platform_device *stratix10_svc_rsu;
  56 };
  57
  58 /**
  59  * struct stratix10_svc_sh_memory - service shared memory structure
  60  * @sync_complete: state for a completion
  61  * @addr: physical address of shared memory block
  62  * @size: size of shared memory block
  63  * @invoke_fn: function to issue secure monitor or hypervisor call
  64  *
  65  * This struct is used to save physical address and size of shared memory
  66  * block. The shared memory blocked is allocated by secure monitor software
  67  * at secure world.
  68  *
  69  * Service layer driver uses the physical address and size to create a memory
  70  * pool, then allocates data buffer from that memory pool for service client.
  71  */
  72 struct stratix10_svc_sh_memory {
  73         struct completion sync_complete;
  74         unsigned long addr;
  75         unsigned long size;
  76         svc_invoke_fn *invoke_fn;
  77 };
  78
  79 /**
  80  * struct stratix10_svc_data_mem - service memory structure
  81  * @vaddr: virtual address
  82  * @paddr: physical address
  83  * @size: size of memory
  84  * @node: link list head node
  85  *
  86  * This struct is used in a list that keeps track of buffers which have
  87  * been allocated or freed from the memory pool. Service layer driver also
  88  * uses this struct to transfer physical address to virtual address.
  89  */
  90 struct stratix10_svc_data_mem {
  91         void *vaddr;
  92         phys_addr_t paddr;
  93         size_t size;
  94         struct list_head node;
  95 };
  96
  97 /**
  98  * struct stratix10_svc_data - service data structure
  99  * @chan: service channel
 100  * @paddr: playload physical address
 101  * @size: playload size
 102  * @command: service command requested by client
 103  * @flag: configuration type (full or partial)
 104  * @arg: args to be passed via registers and not physically mapped buffers
 105  *
 106  * This struct is used in service FIFO for inter-process communication.
 107  */
 108 struct stratix10_svc_data {
 109         struct stratix10_svc_chan *chan;
 110         phys_addr_t paddr;
 111         size_t size;
 112         u32 command;
 113         u32 flag;
 114         u64 arg[3];
 115 };
 116
 117 /**
 118  * struct stratix10_svc_controller - service controller
 119  * @dev: device
 120  * @chans: array of service channels
 121  * @num_chans: number of channels in 'chans' array
 122  * @num_active_client: number of active service client
 123  * @node: list management
 124  * @genpool: memory pool pointing to the memory region
 125  * @task: pointer to the thread task which handles SMC or HVC call
 126  * @svc_fifo: a queue for storing service message data
 127  * @complete_status: state for completion
 128  * @svc_fifo_lock: protect access to service message data queue
 129  * @invoke_fn: function to issue secure monitor call or hypervisor call
 130  *
 131  * This struct is used to create communication channels for service clients, to
 132  * handle secure monitor or hypervisor call.
 133  */
 134 struct stratix10_svc_controller {
 135         struct device *dev;
 136         struct stratix10_svc_chan *chans;
 137         int num_chans;
 138         int num_active_client;
 139         struct list_head node;
 140         struct gen_pool *genpool;
 141         struct task_struct *task;
 142         struct kfifo svc_fifo;
 143         struct completion complete_status;
 144         spinlock_t svc_fifo_lock;
 145         svc_invoke_fn *invoke_fn;
 146 };
 147
 148 /**
 149  * struct stratix10_svc_chan - service communication channel
 150  * @ctrl: pointer to service controller which is the provider of this channel
 151  * @scl: pointer to service client which owns the channel
 152  * @name: service client name associated with the channel
 153  * @lock: protect access to the channel
 154  *
 155  * This struct is used by service client to communicate with service layer, each
 156  * service client has its own channel created by service controller.
 157  */
 158 struct stratix10_svc_chan {
 159         struct stratix10_svc_controller *ctrl;
 160         struct stratix10_svc_client *scl;
 161         char *name;
 162         spinlock_t lock;
 163 };
 164
 165 static LIST_HEAD(svc_ctrl);
 166 static LIST_HEAD(svc_data_mem);
 167
 168 /**
 169  * svc_pa_to_va() - translate physical address to virtual address
 170  * @addr: to be translated physical address
 171  *
 172  * Return: valid virtual address or NULL if the provided physical
 173  * address doesn't exist.
 174  */
 175 static void *svc_pa_to_va(unsigned long addr)
 176 {
 177         struct stratix10_svc_data_mem *pmem;
 178
 179         pr_debug("claim back P-addr=0x%016x\n", (unsigned int)addr);
 180         list_for_each_entry(pmem, &svc_data_mem, node)
 181                 if (pmem->paddr == addr)
 182                         return pmem->vaddr;
 183
 184         /* physical address is not found */
 185         return NULL;
 186 }
 187
 188 /**
 189  * svc_thread_cmd_data_claim() - claim back buffer from the secure world
 190  * @ctrl: pointer to service layer controller
 191  * @p_data: pointer to service data structure
 192  * @cb_data: pointer to callback data structure to service client
 193  *
 194  * Claim back the submitted buffers from the secure world and pass buffer
 195  * back to service client (FPGA manager, etc) for reuse.
 196  */
 197 static void svc_thread_cmd_data_claim(struct stratix10_svc_controller *ctrl,
 198                                       struct stratix10_svc_data *p_data,
 199                                       struct stratix10_svc_cb_data *cb_data)
 200 {
 201         struct arm_smccc_res res;
 202         unsigned long timeout;
 203
 204         reinit_completion(&ctrl->complete_status);
 205         timeout = msecs_to_jiffies(FPGA_CONFIG_DATA_CLAIM_TIMEOUT_MS);
 206
 207         pr_debug("%s: claim back the submitted buffer\n", __func__);
 208         do {
 209                 ctrl->invoke_fn(INTEL_SIP_SMC_FPGA_CONFIG_COMPLETED_WRITE,
 210                                 0, 0, 0, 0, 0, 0, 0, &res);
 211
 212                 if (res.a0 == INTEL_SIP_SMC_STATUS_OK) {
 213                         if (!res.a1) {
 214                                 complete(&ctrl->complete_status);
 215                                 break;
 216                         }
 217                         cb_data->status = BIT(SVC_STATUS_RECONFIG_BUFFER_DONE);
 218                         cb_data->kaddr1 = svc_pa_to_va(res.a1);
 219                         cb_data->kaddr2 = (res.a2) ?
 220                                           svc_pa_to_va(res.a2) : NULL;
 221                         cb_data->kaddr3 = (res.a3) ?
 222                                           svc_pa_to_va(res.a3) : NULL;
 223                         p_data->chan->scl->receive_cb(p_data->chan->scl,
 224                                                       cb_data);
 225                 } else {
 226                         pr_debug("%s: secure world busy, polling again\n",
 227                                  __func__);
 228                 }
 229         } while (res.a0 == INTEL_SIP_SMC_STATUS_OK ||
 230                  res.a0 == INTEL_SIP_SMC_FPGA_CONFIG_STATUS_BUSY ||
 231                  wait_for_completion_timeout(&ctrl->complete_status, timeout));
 232 }
 233
 234 /**
 235  * svc_thread_cmd_config_status() - check configuration status
 236  * @ctrl: pointer to service layer controller
 237  * @p_data: pointer to service data structure
 238  * @cb_data: pointer to callback data structure to service client
 239  *
 240  * Check whether the secure firmware at secure world has finished the FPGA
 241  * configuration, and then inform FPGA manager the configuration status.
 242  */
 243 static void svc_thread_cmd_config_status(struct stratix10_svc_controller *ctrl,
 244                                          struct stratix10_svc_data *p_data,
 245                                          struct stratix10_svc_cb_data *cb_data)
 246 {
 247         struct arm_smccc_res res;
 248         int count_in_sec;
 249
 250         cb_data->kaddr1 = NULL;
 251         cb_data->kaddr2 = NULL;
 252         cb_data->kaddr3 = NULL;
 253         cb_data->status = BIT(SVC_STATUS_RECONFIG_ERROR);
 254
 255         pr_debug("%s: polling config status\n", __func__);
 256
 257         count_in_sec = FPGA_CONFIG_STATUS_TIMEOUT_SEC;
 258         while (count_in_sec) {
 259                 ctrl->invoke_fn(INTEL_SIP_SMC_FPGA_CONFIG_ISDONE,
 260                                 0, 0, 0, 0, 0, 0, 0, &res);
 261                 if ((res.a0 == INTEL_SIP_SMC_STATUS_OK) ||
 262                     (res.a0 == INTEL_SIP_SMC_FPGA_CONFIG_STATUS_ERROR))
 263                         break;
 264
 265                 /*
 266                  * configuration is still in progress, wait one second then
 267                  * poll again
 268                  */
 269                 msleep(1000);
 270                 count_in_sec--;
 271         };
 272
 273         if (res.a0 == INTEL_SIP_SMC_STATUS_OK && count_in_sec)
 274                 cb_data->status = BIT(SVC_STATUS_RECONFIG_COMPLETED);
 275
 276         p_data->chan->scl->receive_cb(p_data->chan->scl, cb_data);
 277 }
 278
 279 /**
 280  * svc_thread_recv_status_ok() - handle the successful status
 281  * @p_data: pointer to service data structure
 282  * @cb_data: pointer to callback data structure to service client
 283  * @res: result from SMC or HVC call
 284  *
 285  * Send back the correspond status to the service clients.
 286  */
 287 static void svc_thread_recv_status_ok(struct stratix10_svc_data *p_data,
 288                                       struct stratix10_svc_cb_data *cb_data,
 289                                       struct arm_smccc_res res)
 290 {
 291         cb_data->kaddr1 = NULL;
 292         cb_data->kaddr2 = NULL;
 293         cb_data->kaddr3 = NULL;
 294
 295         switch (p_data->command) {
 296         case COMMAND_RECONFIG:
 297                 cb_data->status = BIT(SVC_STATUS_RECONFIG_REQUEST_OK);
 298                 break;
 299         case COMMAND_RECONFIG_DATA_SUBMIT:
 300                 cb_data->status = BIT(SVC_STATUS_RECONFIG_BUFFER_SUBMITTED);
 301                 break;
 302         case COMMAND_NOOP:
 303                 cb_data->status = BIT(SVC_STATUS_RECONFIG_BUFFER_SUBMITTED);
 304                 cb_data->kaddr1 = svc_pa_to_va(res.a1);
 305                 break;
 306         case COMMAND_RECONFIG_STATUS:
 307                 cb_data->status = BIT(SVC_STATUS_RECONFIG_COMPLETED);
 308                 break;
 309         case COMMAND_RSU_UPDATE:
 310         case COMMAND_RSU_NOTIFY:
 311                 cb_data->status = BIT(SVC_STATUS_RSU_OK);
 312                 break;
 313         case COMMAND_RSU_RETRY:
 314                 cb_data->status = BIT(SVC_STATUS_RSU_OK);
 315                 cb_data->kaddr1 = &res.a1;
 316                 break;
 317         default:
 318                 pr_warn("it shouldn't happen\n");
 319                 break;
 320         }
 321
 322         pr_debug("%s: call receive_cb\n", __func__);
 323         p_data->chan->scl->receive_cb(p_data->chan->scl, cb_data);
 324 }
 325
 326 /**
 327  * svc_normal_to_secure_thread() - the function to run in the kthread
 328  * @data: data pointer for kthread function
 329  *
 330  * Service layer driver creates stratix10_svc_smc_hvc_call kthread on CPU
 331  * node 0, its function stratix10_svc_secure_call_thread is used to handle
 332  * SMC or HVC calls between kernel driver and secure monitor software.
 333  *
 334  * Return: 0 for success or -ENOMEM on error.
 335  */
 336 static int svc_normal_to_secure_thread(void *data)
 337 {
 338         struct stratix10_svc_controller
 339                         *ctrl = (struct stratix10_svc_controller *)data;
 340         struct stratix10_svc_data *pdata;
 341         struct stratix10_svc_cb_data *cbdata;
 342         struct arm_smccc_res res;
 343         unsigned long a0, a1, a2;
 344         int ret_fifo = 0;
 345
 346         pdata =  kmalloc(sizeof(*pdata), GFP_KERNEL);
 347         if (!pdata)
 348                 return -ENOMEM;
 349
 350         cbdata = kmalloc(sizeof(*cbdata), GFP_KERNEL);
 351         if (!cbdata) {
 352                 kfree(pdata);
 353                 return -ENOMEM;
 354         }
 355
 356         /* default set, to remove build warning */
 357         a0 = INTEL_SIP_SMC_FPGA_CONFIG_LOOPBACK;
 358         a1 = 0;
 359         a2 = 0;
 360
 361         pr_debug("smc_hvc_shm_thread is running\n");
 362
 363         while (!kthread_should_stop()) {
 364                 ret_fifo = kfifo_out_spinlocked(&ctrl->svc_fifo,
 365                                                 pdata, sizeof(*pdata),
 366                                                 &ctrl->svc_fifo_lock);
 367
 368                 if (!ret_fifo)
 369                         continue;
 370
 371                 pr_debug("get from FIFO pa=0x%016x, command=%u, size=%u\n",
 372                          (unsigned int)pdata->paddr, pdata->command,
 373                          (unsigned int)pdata->size);
 374
 375                 switch (pdata->command) {
 376                 case COMMAND_RECONFIG_DATA_CLAIM:
 377                         svc_thread_cmd_data_claim(ctrl, pdata, cbdata);
 378                         continue;
 379                 case COMMAND_RECONFIG:
 380                         a0 = INTEL_SIP_SMC_FPGA_CONFIG_START;
 381                         pr_debug("conf_type=%u\n", (unsigned int)pdata->flag);
 382                         a1 = pdata->flag;
 383                         a2 = 0;
 384                         break;
 385                 case COMMAND_RECONFIG_DATA_SUBMIT:
 386                         a0 = INTEL_SIP_SMC_FPGA_CONFIG_WRITE;
 387                         a1 = (unsigned long)pdata->paddr;
 388                         a2 = (unsigned long)pdata->size;
 389                         break;
 390                 case COMMAND_RECONFIG_STATUS:
 391                         a0 = INTEL_SIP_SMC_FPGA_CONFIG_ISDONE;
 392                         a1 = 0;
 393                         a2 = 0;
 394                         break;
 395                 case COMMAND_RSU_STATUS:
 396                         a0 = INTEL_SIP_SMC_RSU_STATUS;
 397                         a1 = 0;
 398                         a2 = 0;
 399                         break;
 400                 case COMMAND_RSU_UPDATE:
 401                         a0 = INTEL_SIP_SMC_RSU_UPDATE;
 402                         a1 = pdata->arg[0];
 403                         a2 = 0;
 404                         break;
 405                 case COMMAND_RSU_NOTIFY:
 406                         a0 = INTEL_SIP_SMC_RSU_NOTIFY;
 407                         a1 = pdata->arg[0];
 408                         a2 = 0;
 409                         break;
 410                 case COMMAND_RSU_RETRY:
 411                         a0 = INTEL_SIP_SMC_RSU_RETRY_COUNTER;
 412                         a1 = 0;
 413                         a2 = 0;
 414                         break;
 415                 default:
 416                         pr_warn("it shouldn't happen\n");
 417                         break;
 418                 }
 419                 pr_debug("%s: before SMC call -- a0=0x%016x a1=0x%016x",
 420                          __func__, (unsigned int)a0, (unsigned int)a1);
 421                 pr_debug(" a2=0x%016x\n", (unsigned int)a2);
 422
 423                 ctrl->invoke_fn(a0, a1, a2, 0, 0, 0, 0, 0, &res);
 424
 425                 pr_debug("%s: after SMC call -- res.a0=0x%016x",
 426                          __func__, (unsigned int)res.a0);
 427                 pr_debug(" res.a1=0x%016x, res.a2=0x%016x",
 428                          (unsigned int)res.a1, (unsigned int)res.a2);
 429                 pr_debug(" res.a3=0x%016x\n", (unsigned int)res.a3);
 430
 431                 if (pdata->command == COMMAND_RSU_STATUS) {
 432                         if (res.a0 == INTEL_SIP_SMC_RSU_ERROR)
 433                                 cbdata->status = BIT(SVC_STATUS_RSU_ERROR);
 434                         else
 435                                 cbdata->status = BIT(SVC_STATUS_RSU_OK);
 436
 437                         cbdata->kaddr1 = &res;
 438                         cbdata->kaddr2 = NULL;
 439                         cbdata->kaddr3 = NULL;
 440                         pdata->chan->scl->receive_cb(pdata->chan->scl, cbdata);
 441                         continue;
 442                 }
 443
 444                 switch (res.a0) {
 445                 case INTEL_SIP_SMC_STATUS_OK:
 446                         svc_thread_recv_status_ok(pdata, cbdata, res);
 447                         break;
 448                 case INTEL_SIP_SMC_FPGA_CONFIG_STATUS_BUSY:
 449                         switch (pdata->command) {
 450                         case COMMAND_RECONFIG_DATA_SUBMIT:
 451                                 svc_thread_cmd_data_claim(ctrl,
 452                                                           pdata, cbdata);
 453                                 break;
 454                         case COMMAND_RECONFIG_STATUS:
 455                                 svc_thread_cmd_config_status(ctrl,
 456                                                              pdata, cbdata);
 457                                 break;
 458                         default:
 459                                 pr_warn("it shouldn't happen\n");
 460                                 break;
 461                         }
 462                         break;
 463                 case INTEL_SIP_SMC_FPGA_CONFIG_STATUS_REJECTED:
 464                         pr_debug("%s: STATUS_REJECTED\n", __func__);
 465                         break;
 466                 case INTEL_SIP_SMC_FPGA_CONFIG_STATUS_ERROR:
 467                 case INTEL_SIP_SMC_RSU_ERROR:
 468                         pr_err("%s: STATUS_ERROR\n", __func__);
 469                         switch (pdata->command) {
 470                         /* for FPGA mgr */
 471                         case COMMAND_RECONFIG_DATA_CLAIM:
 472                         case COMMAND_RECONFIG:
 473                         case COMMAND_RECONFIG_DATA_SUBMIT:
 474                         case COMMAND_RECONFIG_STATUS:
 475                                 cbdata->status =
 476                                         BIT(SVC_STATUS_RECONFIG_ERROR);
 477                                 break;
 478
 479                         /* for RSU */
 480                         case COMMAND_RSU_STATUS:
 481                         case COMMAND_RSU_UPDATE:
 482                         case COMMAND_RSU_NOTIFY:
 483                         case COMMAND_RSU_RETRY:
 484                                 cbdata->status =
 485                                         BIT(SVC_STATUS_RSU_ERROR);
 486                                 break;
 487                         }
 488
 489                         cbdata->status = BIT(SVC_STATUS_RECONFIG_ERROR);
 490                         cbdata->kaddr1 = NULL;
 491                         cbdata->kaddr2 = NULL;
 492                         cbdata->kaddr3 = NULL;
 493                         pdata->chan->scl->receive_cb(pdata->chan->scl, cbdata);
 494                         break;
 495                 default:
 496                         pr_warn("Secure firmware doesn't support...\n");
 497
 498                         /*
 499                          * be compatible with older version firmware which
 500                          * doesn't support RSU notify or retry
 501                          */
 502                         if ((pdata->command == COMMAND_RSU_RETRY) ||
 503                                 (pdata->command == COMMAND_RSU_NOTIFY)) {
 504                                 cbdata->status =
 505                                         BIT(SVC_STATUS_RSU_NO_SUPPORT);
 506                                 cbdata->kaddr1 = NULL;
 507                                 cbdata->kaddr2 = NULL;
 508                                 cbdata->kaddr3 = NULL;
 509                                 pdata->chan->scl->receive_cb(
 510                                         pdata->chan->scl, cbdata);
 511                         }
 512                         break;
 513
 514                 }
 515         };
 516
 517         kfree(cbdata);
 518         kfree(pdata);
 519
 520         return 0;
 521 }
 522
 523 /**
 524  * svc_normal_to_secure_shm_thread() - the function to run in the kthread
 525  * @data: data pointer for kthread function
 526  *
 527  * Service layer driver creates stratix10_svc_smc_hvc_shm kthread on CPU
 528  * node 0, its function stratix10_svc_secure_shm_thread is used to query the
 529  * physical address of memory block reserved by secure monitor software at
 530  * secure world.
 531  *
 532  * svc_normal_to_secure_shm_thread() calls do_exit() directly since it is a
 533  * standlone thread for which no one will call kthread_stop() or return when
 534  * 'kthread_should_stop()' is true.
 535  */
 536 static int svc_normal_to_secure_shm_thread(void *data)
 537 {
 538         struct stratix10_svc_sh_memory
 539                         *sh_mem = (struct stratix10_svc_sh_memory *)data;
 540         struct arm_smccc_res res;
 541
 542         /* SMC or HVC call to get shared memory info from secure world */
 543         sh_mem->invoke_fn(INTEL_SIP_SMC_FPGA_CONFIG_GET_MEM,
 544                           0, 0, 0, 0, 0, 0, 0, &res);
 545         if (res.a0 == INTEL_SIP_SMC_STATUS_OK) {
 546                 sh_mem->addr = res.a1;
 547                 sh_mem->size = res.a2;
 548         } else {
 549                 pr_err("%s: after SMC call -- res.a0=0x%016x",  __func__,
 550                        (unsigned int)res.a0);
 551                 sh_mem->addr = 0;
 552                 sh_mem->size = 0;
 553         }
 554
 555         complete(&sh_mem->sync_complete);
 556         do_exit(0);
 557 }
 558
 559 /**
 560  * svc_get_sh_memory() - get memory block reserved by secure monitor SW
 561  * @pdev: pointer to service layer device
 562  * @sh_memory: pointer to service shared memory structure
 563  *
 564  * Return: zero for successfully getting the physical address of memory block
 565  * reserved by secure monitor software, or negative value on error.
 566  */
 567 static int svc_get_sh_memory(struct platform_device *pdev,
 568                                     struct stratix10_svc_sh_memory *sh_memory)
 569 {
 570         struct device *dev = &pdev->dev;
 571         struct task_struct *sh_memory_task;
 572         unsigned int cpu = 0;
 573
 574         init_completion(&sh_memory->sync_complete);
 575
 576         /* smc or hvc call happens on cpu 0 bound kthread */
 577         sh_memory_task = kthread_create_on_node(svc_normal_to_secure_shm_thread,
 578                                                (void *)sh_memory,
 579                                                 cpu_to_node(cpu),
 580                                                 "svc_smc_hvc_shm_thread");
 581         if (IS_ERR(sh_memory_task)) {
 582                 dev_err(dev, "fail to create stratix10_svc_smc_shm_thread\n");
 583                 return -EINVAL;
 584         }
 585
 586         wake_up_process(sh_memory_task);
 587
 588         if (!wait_for_completion_timeout(&sh_memory->sync_complete, 10 * HZ)) {
 589                 dev_err(dev,
 590                         "timeout to get sh-memory paras from secure world\n");
 591                 return -ETIMEDOUT;
 592         }
 593
 594         if (!sh_memory->addr || !sh_memory->size) {
 595                 dev_err(dev,
 596                         "failed to get shared memory info from secure world\n");
 597                 return -ENOMEM;
 598         }
 599
 600         dev_dbg(dev, "SM software provides paddr: 0x%016x, size: 0x%08x\n",
 601                 (unsigned int)sh_memory->addr,
 602                 (unsigned int)sh_memory->size);
 603
 604         return 0;
 605 }
 606
 607 /**
 608  * svc_create_memory_pool() - create a memory pool from reserved memory block
 609  * @pdev: pointer to service layer device
 610  * @sh_memory: pointer to service shared memory structure
 611  *
 612  * Return: pool allocated from reserved memory block or ERR_PTR() on error.
 613  */
 614 static struct gen_pool *
 615 svc_create_memory_pool(struct platform_device *pdev,
 616                        struct stratix10_svc_sh_memory *sh_memory)
 617 {
 618         struct device *dev = &pdev->dev;
 619         struct gen_pool *genpool;
 620         unsigned long vaddr;
 621         phys_addr_t paddr;
 622         size_t size;
 623         phys_addr_t begin;
 624         phys_addr_t end;
 625         void *va;
 626         size_t page_mask = PAGE_SIZE - 1;
 627         int min_alloc_order = 3;
 628         int ret;
 629
 630         begin = roundup(sh_memory->addr, PAGE_SIZE);
 631         end = rounddown(sh_memory->addr + sh_memory->size, PAGE_SIZE);
 632         paddr = begin;
 633         size = end - begin;
 634         va = memremap(paddr, size, MEMREMAP_WC);
 635         if (!va) {
 636                 dev_err(dev, "fail to remap shared memory\n");
 637                 return ERR_PTR(-EINVAL);
 638         }
 639         vaddr = (unsigned long)va;
 640         dev_dbg(dev,
 641                 "reserved memory vaddr: %p, paddr: 0x%16x size: 0x%8x\n",
 642                 va, (unsigned int)paddr, (unsigned int)size);
 643         if ((vaddr & page_mask) || (paddr & page_mask) ||
 644             (size & page_mask)) {
 645                 dev_err(dev, "page is not aligned\n");
 646                 return ERR_PTR(-EINVAL);
 647         }
 648         genpool = gen_pool_create(min_alloc_order, -1);
 649         if (!genpool) {
 650                 dev_err(dev, "fail to create genpool\n");
 651                 return ERR_PTR(-ENOMEM);
 652         }
 653         gen_pool_set_algo(genpool, gen_pool_best_fit, NULL);
 654         ret = gen_pool_add_virt(genpool, vaddr, paddr, size, -1);
 655         if (ret) {
 656                 dev_err(dev, "fail to add memory chunk to the pool\n");
 657                 gen_pool_destroy(genpool);
 658                 return ERR_PTR(ret);
 659         }
 660
 661         return genpool;
 662 }
 663
 664 /**
 665  * svc_smccc_smc() - secure monitor call between normal and secure world
 666  * @a0: argument passed in registers 0
 667  * @a1: argument passed in registers 1
 668  * @a2: argument passed in registers 2
 669  * @a3: argument passed in registers 3
 670  * @a4: argument passed in registers 4
 671  * @a5: argument passed in registers 5
 672  * @a6: argument passed in registers 6
 673  * @a7: argument passed in registers 7
 674  * @res: result values from register 0 to 3
 675  */
 676 static void svc_smccc_smc(unsigned long a0, unsigned long a1,
 677                           unsigned long a2, unsigned long a3,
 678                           unsigned long a4, unsigned long a5,
 679                           unsigned long a6, unsigned long a7,
 680                           struct arm_smccc_res *res)
 681 {
 682         arm_smccc_smc(a0, a1, a2, a3, a4, a5, a6, a7, res);
 683 }
 684
 685 /**
 686  * svc_smccc_hvc() - hypervisor call between normal and secure world
 687  * @a0: argument passed in registers 0
 688  * @a1: argument passed in registers 1
 689  * @a2: argument passed in registers 2
 690  * @a3: argument passed in registers 3
 691  * @a4: argument passed in registers 4
 692  * @a5: argument passed in registers 5
 693  * @a6: argument passed in registers 6
 694  * @a7: argument passed in registers 7
 695  * @res: result values from register 0 to 3
 696  */
 697 static void svc_smccc_hvc(unsigned long a0, unsigned long a1,
 698                           unsigned long a2, unsigned long a3,
 699                           unsigned long a4, unsigned long a5,
 700                           unsigned long a6, unsigned long a7,
 701                           struct arm_smccc_res *res)
 702 {
 703         arm_smccc_hvc(a0, a1, a2, a3, a4, a5, a6, a7, res);
 704 }
 705
 706 /**
 707  * get_invoke_func() - invoke SMC or HVC call
 708  * @dev: pointer to device
 709  *
 710  * Return: function pointer to svc_smccc_smc or svc_smccc_hvc.
 711  */
 712 static svc_invoke_fn *get_invoke_func(struct device *dev)
 713 {
 714         const char *method;
 715
 716         if (of_property_read_string(dev->of_node, "method", &method)) {
 717                 dev_warn(dev, "missing \"method\" property\n");
 718                 return ERR_PTR(-ENXIO);
 719         }
 720
 721         if (!strcmp(method, "smc"))
 722                 return svc_smccc_smc;
 723         if (!strcmp(method, "hvc"))
 724                 return svc_smccc_hvc;
 725
 726         dev_warn(dev, "invalid \"method\" property: %s\n", method);
 727
 728         return ERR_PTR(-EINVAL);
 729 }
 730
 731 /**
 732  * stratix10_svc_request_channel_byname() - request a service channel
 733  * @client: pointer to service client
 734  * @name: service client name
 735  *
 736  * This function is used by service client to request a service channel.
 737  *
 738  * Return: a pointer to channel assigned to the client on success,
 739  * or ERR_PTR() on error.
 740  */
 741 struct stratix10_svc_chan *stratix10_svc_request_channel_byname(
 742         struct stratix10_svc_client *client, const char *name)
 743 {
 744         struct device *dev = client->dev;
 745         struct stratix10_svc_controller *controller;
 746         struct stratix10_svc_chan *chan = NULL;
 747         unsigned long flag;
 748         int i;
 749
 750         /* if probe was called after client's, or error on probe */
 751         if (list_empty(&svc_ctrl))
 752                 return ERR_PTR(-EPROBE_DEFER);
 753
 754         controller = list_first_entry(&svc_ctrl,
 755                                       struct stratix10_svc_controller, node);
 756         for (i = 0; i < SVC_NUM_CHANNEL; i++) {
 757                 if (!strcmp(controller->chans[i].name, name)) {
 758                         chan = &controller->chans[i];
 759                         break;
 760                 }
 761         }
 762
 763         /* if there was no channel match */
 764         if (i == SVC_NUM_CHANNEL) {
 765                 dev_err(dev, "%s: channel not allocated\n", __func__);
 766                 return ERR_PTR(-EINVAL);
 767         }
 768
 769         if (chan->scl || !try_module_get(controller->dev->driver->owner)) {
 770                 dev_dbg(dev, "%s: svc not free\n", __func__);
 771                 return ERR_PTR(-EBUSY);
 772         }
 773
 774         spin_lock_irqsave(&chan->lock, flag);
 775         chan->scl = client;
 776         chan->ctrl->num_active_client++;
 777         spin_unlock_irqrestore(&chan->lock, flag);
 778
 779         return chan;
 780 }
 781 EXPORT_SYMBOL_GPL(stratix10_svc_request_channel_byname);
 782
 783 /**
 784  * stratix10_svc_free_channel() - free service channel
 785  * @chan: service channel to be freed
 786  *
 787  * This function is used by service client to free a service channel.
 788  */
 789 void stratix10_svc_free_channel(struct stratix10_svc_chan *chan)
 790 {
 791         unsigned long flag;
 792
 793         spin_lock_irqsave(&chan->lock, flag);
 794         chan->scl = NULL;
 795         chan->ctrl->num_active_client--;
 796         module_put(chan->ctrl->dev->driver->owner);
 797         spin_unlock_irqrestore(&chan->lock, flag);
 798 }
 799 EXPORT_SYMBOL_GPL(stratix10_svc_free_channel);
 800
 801 /**
 802  * stratix10_svc_send() - send a message data to the remote
 803  * @chan: service channel assigned to the client
 804  * @msg: message data to be sent, in the format of
 805  * "struct stratix10_svc_client_msg"
 806  *
 807  * This function is used by service client to add a message to the service
 808  * layer driver's queue for being sent to the secure world.
 809  *
 810  * Return: 0 for success, -ENOMEM or -ENOBUFS on error.
 811  */
 812 int stratix10_svc_send(struct stratix10_svc_chan *chan, void *msg)
 813 {
 814         struct stratix10_svc_client_msg
 815                 *p_msg = (struct stratix10_svc_client_msg *)msg;
 816         struct stratix10_svc_data_mem *p_mem;
 817         struct stratix10_svc_data *p_data;
 818         int ret = 0;
 819         unsigned int cpu = 0;
 820
 821         p_data = kzalloc(sizeof(*p_data), GFP_KERNEL);
 822         if (!p_data)
 823                 return -ENOMEM;
 824
 825         /* first client will create kernel thread */
 826         if (!chan->ctrl->task) {
 827                 chan->ctrl->task =
 828                         kthread_create_on_node(svc_normal_to_secure_thread,
 829                                               (void *)chan->ctrl,
 830                                               cpu_to_node(cpu),
 831                                               "svc_smc_hvc_thread");
 832                         if (IS_ERR(chan->ctrl->task)) {
 833                                 dev_err(chan->ctrl->dev,
 834                                         "failed to create svc_smc_hvc_thread\n");
 835                                 kfree(p_data);
 836                                 return -EINVAL;
 837                         }
 838                 kthread_bind(chan->ctrl->task, cpu);
 839                 wake_up_process(chan->ctrl->task);
 840         }
 841
 842         pr_debug("%s: sent P-va=%p, P-com=%x, P-size=%u\n", __func__,
 843                  p_msg->payload, p_msg->command,
 844                  (unsigned int)p_msg->payload_length);
 845
 846         if (list_empty(&svc_data_mem)) {
 847                 if (p_msg->command == COMMAND_RECONFIG) {
 848                         struct stratix10_svc_command_config_type *ct =
 849                                 (struct stratix10_svc_command_config_type *)
 850                                 p_msg->payload;
 851                         p_data->flag = ct->flags;
 852                 }
 853         } else {
 854                 list_for_each_entry(p_mem, &svc_data_mem, node)
 855                         if (p_mem->vaddr == p_msg->payload) {
 856                                 p_data->paddr = p_mem->paddr;
 857                                 break;
 858                         }
 859         }
 860
 861         p_data->command = p_msg->command;
 862         p_data->arg[0] = p_msg->arg[0];
 863         p_data->arg[1] = p_msg->arg[1];
 864         p_data->arg[2] = p_msg->arg[2];
 865         p_data->size = p_msg->payload_length;
 866         p_data->chan = chan;
 867         pr_debug("%s: put to FIFO pa=0x%016x, cmd=%x, size=%u\n", __func__,
 868                (unsigned int)p_data->paddr, p_data->command,
 869                (unsigned int)p_data->size);
 870         ret = kfifo_in_spinlocked(&chan->ctrl->svc_fifo, p_data,
 871                                   sizeof(*p_data),
 872                                   &chan->ctrl->svc_fifo_lock);
 873
 874         kfree(p_data);
 875
 876         if (!ret)
 877                 return -ENOBUFS;
 878
 879         return 0;
 880 }
 881 EXPORT_SYMBOL_GPL(stratix10_svc_send);
 882
 883 /**
 884  * stratix10_svc_done() - complete service request transactions
 885  * @chan: service channel assigned to the client
 886  *
 887  * This function should be called when client has finished its request
 888  * or there is an error in the request process. It allows the service layer
 889  * to stop the running thread to have maximize savings in kernel resources.
 890  */
 891 void stratix10_svc_done(struct stratix10_svc_chan *chan)
 892 {
 893         /* stop thread when thread is running AND only one active client */
 894         if (chan->ctrl->task && chan->ctrl->num_active_client <= 1) {
 895                 pr_debug("svc_smc_hvc_shm_thread is stopped\n");
 896                 kthread_stop(chan->ctrl->task);
 897                 chan->ctrl->task = NULL;
 898         }
 899 }
 900 EXPORT_SYMBOL_GPL(stratix10_svc_done);
 901
 902 /**
 903  * stratix10_svc_allocate_memory() - allocate memory
 904  * @chan: service channel assigned to the client
 905  * @size: memory size requested by a specific service client
 906  *
 907  * Service layer allocates the requested number of bytes buffer from the
 908  * memory pool, service client uses this function to get allocated buffers.
 909  *
 910  * Return: address of allocated memory on success, or ERR_PTR() on error.
 911  */
 912 void *stratix10_svc_allocate_memory(struct stratix10_svc_chan *chan,
 913                                     size_t size)
 914 {
 915         struct stratix10_svc_data_mem *pmem;
 916         unsigned long va;
 917         phys_addr_t pa;
 918         struct gen_pool *genpool = chan->ctrl->genpool;
 919         size_t s = roundup(size, 1 << genpool->min_alloc_order);
 920
 921         pmem = devm_kzalloc(chan->ctrl->dev, sizeof(*pmem), GFP_KERNEL);
 922         if (!pmem)
 923                 return ERR_PTR(-ENOMEM);
 924
 925         va = gen_pool_alloc(genpool, s);
 926         if (!va)
 927                 return ERR_PTR(-ENOMEM);
 928
 929         memset((void *)va, 0, s);
 930         pa = gen_pool_virt_to_phys(genpool, va);
 931
 932         pmem->vaddr = (void *)va;
 933         pmem->paddr = pa;
 934         pmem->size = s;
 935         list_add_tail(&pmem->node, &svc_data_mem);
 936         pr_debug("%s: va=%p, pa=0x%016x\n", __func__,
 937                  pmem->vaddr, (unsigned int)pmem->paddr);
 938
 939         return (void *)va;
 940 }
 941 EXPORT_SYMBOL_GPL(stratix10_svc_allocate_memory);
 942
 943 /**
 944  * stratix10_svc_free_memory() - free allocated memory
 945  * @chan: service channel assigned to the client
 946  * @kaddr: memory to be freed
 947  *
 948  * This function is used by service client to free allocated buffers.
 949  */
 950 void stratix10_svc_free_memory(struct stratix10_svc_chan *chan, void *kaddr)
 951 {
 952         struct stratix10_svc_data_mem *pmem;
 953         size_t size = 0;
 954
 955         list_for_each_entry(pmem, &svc_data_mem, node)
 956                 if (pmem->vaddr == kaddr) {
 957                         size = pmem->size;
 958                         break;
 959                 }
 960
 961         gen_pool_free(chan->ctrl->genpool, (unsigned long)kaddr, size);
 962         pmem->vaddr = NULL;
 963         list_del(&pmem->node);
 964 }
 965 EXPORT_SYMBOL_GPL(stratix10_svc_free_memory);
 966
 967 static const struct of_device_id stratix10_svc_drv_match[] = {
 968         {.compatible = "intel,stratix10-svc"},
 969         {},
 970 };
 971
 972 static int stratix10_svc_drv_probe(struct platform_device *pdev)
 973 {
 974         struct device *dev = &pdev->dev;
 975         struct stratix10_svc_controller *controller;
 976         struct stratix10_svc_chan *chans;
 977         struct gen_pool *genpool;
 978         struct stratix10_svc_sh_memory *sh_memory;
 979         struct stratix10_svc *svc;
 980
 981         svc_invoke_fn *invoke_fn;
 982         size_t fifo_size;
 983         int ret;
 984
 985         /* get SMC or HVC function */
 986         invoke_fn = get_invoke_func(dev);
 987         if (IS_ERR(invoke_fn))
 988                 return -EINVAL;
 989
 990         sh_memory = devm_kzalloc(dev, sizeof(*sh_memory), GFP_KERNEL);
 991         if (!sh_memory)
 992                 return -ENOMEM;
 993
 994         sh_memory->invoke_fn = invoke_fn;
 995         ret = svc_get_sh_memory(pdev, sh_memory);
 996         if (ret)
 997                 return ret;
 998
 999         genpool = svc_create_memory_pool(pdev, sh_memory);
1000         if (!genpool)
1001                 return -ENOMEM;
1002
1003         /* allocate service controller and supporting channel */
1004         controller = devm_kzalloc(dev, sizeof(*controller), GFP_KERNEL);
1005         if (!controller)
1006                 return -ENOMEM;
1007
1008         chans = devm_kmalloc_array(dev, SVC_NUM_CHANNEL,
1009                                    sizeof(*chans), GFP_KERNEL | __GFP_ZERO);
1010         if (!chans)
1011                 return -ENOMEM;
1012
1013         controller->dev = dev;
1014         controller->num_chans = SVC_NUM_CHANNEL;
1015         controller->num_active_client = 0;
1016         controller->chans = chans;
1017         controller->genpool = genpool;
1018         controller->task = NULL;
1019         controller->invoke_fn = invoke_fn;
1020         init_completion(&controller->complete_status);
1021
1022         fifo_size = sizeof(struct stratix10_svc_data) * SVC_NUM_DATA_IN_FIFO;
1023         ret = kfifo_alloc(&controller->svc_fifo, fifo_size, GFP_KERNEL);
1024         if (ret) {
1025                 dev_err(dev, "failed to allocate FIFO\n");
1026                 return ret;
1027         }
1028         spin_lock_init(&controller->svc_fifo_lock);
1029
1030         chans[0].scl = NULL;
1031         chans[0].ctrl = controller;
1032         chans[0].name = SVC_CLIENT_FPGA;
1033         spin_lock_init(&chans[0].lock);
1034
1035         chans[1].scl = NULL;
1036         chans[1].ctrl = controller;
1037         chans[1].name = SVC_CLIENT_RSU;
1038         spin_lock_init(&chans[1].lock);
1039
1040         list_add_tail(&controller->node, &svc_ctrl);
1041         platform_set_drvdata(pdev, controller);
1042
1043         /* add svc client device(s) */
1044         svc = devm_kzalloc(dev, sizeof(*svc), GFP_KERNEL);
1045         if (!svc)
1046                 return -ENOMEM;
1047
1048         svc->stratix10_svc_rsu = platform_device_alloc(STRATIX10_RSU, 0);
1049         if (!svc->stratix10_svc_rsu) {
1050                 dev_err(dev, "failed to allocate %s device\n", STRATIX10_RSU);
1051                 return -ENOMEM;
1052         }
1053
1054         ret = platform_device_add(svc->stratix10_svc_rsu);
1055         if (ret) {
1056                 platform_device_put(svc->stratix10_svc_rsu);
1057                 return ret;
1058         }
1059         dev_set_drvdata(dev, svc);
1060
1061         pr_info("Intel Service Layer Driver Initialized\n");
1062
1063         return ret;
1064 }
1065
1066 static int stratix10_svc_drv_remove(struct platform_device *pdev)
1067 {
1068         struct stratix10_svc *svc = dev_get_drvdata(&pdev->dev);
1069         struct stratix10_svc_controller *ctrl = platform_get_drvdata(pdev);
1070
1071         platform_device_unregister(svc->stratix10_svc_rsu);
1072
1073         kfifo_free(&ctrl->svc_fifo);
1074         if (ctrl->task) {
1075                 kthread_stop(ctrl->task);
1076                 ctrl->task = NULL;
1077         }
1078         if (ctrl->genpool)
1079                 gen_pool_destroy(ctrl->genpool);
1080         list_del(&ctrl->node);
1081
1082         return 0;
1083 }
1084
1085 static struct platform_driver stratix10_svc_driver = {
1086         .probe = stratix10_svc_drv_probe,
1087         .remove = stratix10_svc_drv_remove,
1088         .driver = {
1089                 .name = "stratix10-svc",
1090                 .of_match_table = stratix10_svc_drv_match,
1091         },
1092 };
1093
1094 static int __init stratix10_svc_init(void)
1095 {
1096         struct device_node *fw_np;
1097         struct device_node *np;
1098         int ret;
1099
1100         fw_np = of_find_node_by_name(NULL, "firmware");
1101         if (!fw_np)
1102                 return -ENODEV;
1103
1104         np = of_find_matching_node(fw_np, stratix10_svc_drv_match);
1105         if (!np)
1106                 return -ENODEV;
1107
1108         of_node_put(np);
1109         ret = of_platform_populate(fw_np, stratix10_svc_drv_match, NULL, NULL);
1110         if (ret)
1111                 return ret;
1112
1113         return platform_driver_register(&stratix10_svc_driver);
1114 }
1115
1116 static void __exit stratix10_svc_exit(void)
1117 {
1118         return platform_driver_unregister(&stratix10_svc_driver);
1119 }
1120
1121 subsys_initcall(stratix10_svc_init);
1122 module_exit(stratix10_svc_exit);
1123
1124 MODULE_LICENSE("GPL v2");
1125 MODULE_DESCRIPTION("Intel Stratix10 Service Layer Driver");
1126 MODULE_AUTHOR("Richard Gong <richard.gong@intel.com>");
1127 MODULE_ALIAS("platform:stratix10-svc");