drivers/platform/x86/amd/pmf/acpi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * AMD Platform Management Framework Driver
   4  *
   5  * Copyright (c) 2022, Advanced Micro Devices, Inc.
   6  * All Rights Reserved.
   7  *
   8  * Author: Shyam Sundar S K <[email protected]>
   9  */
  10
  11 #include <linux/acpi.h>
  12 #include "pmf.h"
  13
  14 #define APMF_CQL_NOTIFICATION  2
  15 #define APMF_AMT_NOTIFICATION  3
  16
  17 static union acpi_object *apmf_if_call(struct amd_pmf_dev *pdev, int fn, struct acpi_buffer *param)
  18 {
  19         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
  20         acpi_handle ahandle = ACPI_HANDLE(pdev->dev);
  21         struct acpi_object_list apmf_if_arg_list;
  22         union acpi_object apmf_if_args[2];
  23         acpi_status status;
  24
  25         apmf_if_arg_list.count = 2;
  26         apmf_if_arg_list.pointer = &apmf_if_args[0];
  27
  28         apmf_if_args[0].type = ACPI_TYPE_INTEGER;
  29         apmf_if_args[0].integer.value = fn;
  30
  31         if (param) {
  32                 apmf_if_args[1].type = ACPI_TYPE_BUFFER;
  33                 apmf_if_args[1].buffer.length = param->length;
  34                 apmf_if_args[1].buffer.pointer = param->pointer;
  35         } else {
  36                 apmf_if_args[1].type = ACPI_TYPE_INTEGER;
  37                 apmf_if_args[1].integer.value = 0;
  38         }
  39
  40         status = acpi_evaluate_object(ahandle, "APMF", &apmf_if_arg_list, &buffer);
  41         if (ACPI_FAILURE(status)) {
  42                 dev_err(pdev->dev, "APMF method:%d call failed\n", fn);
  43                 kfree(buffer.pointer);
  44                 return NULL;
  45         }
  46
  47         return buffer.pointer;
  48 }
  49
  50 static int apmf_if_call_store_buffer(struct amd_pmf_dev *pdev, int fn, void *dest, size_t out_sz)
  51 {
  52         union acpi_object *info;
  53         size_t size;
  54         int err = 0;
  55
  56         info = apmf_if_call(pdev, fn, NULL);
  57         if (!info)
  58                 return -EIO;
  59
  60         if (info->type != ACPI_TYPE_BUFFER) {
  61                 dev_err(pdev->dev, "object is not a buffer\n");
  62                 err = -EINVAL;
  63                 goto out;
  64         }
  65
  66         if (info->buffer.length < 2) {
  67                 dev_err(pdev->dev, "buffer too small\n");
  68                 err = -EINVAL;
  69                 goto out;
  70         }
  71
  72         size = *(u16 *)info->buffer.pointer;
  73         if (info->buffer.length < size) {
  74                 dev_err(pdev->dev, "buffer smaller then headersize %u < %zu\n",
  75                         info->buffer.length, size);
  76                 err = -EINVAL;
  77                 goto out;
  78         }
  79
  80         if (size < out_sz) {
  81                 dev_err(pdev->dev, "buffer too small %zu\n", size);
  82                 err = -EINVAL;
  83                 goto out;
  84         }
  85
  86         memcpy(dest, info->buffer.pointer, out_sz);
  87
  88 out:
  89         kfree(info);
  90         return err;
  91 }
  92
  93 static union acpi_object *apts_if_call(struct amd_pmf_dev *pdev, u32 state_index)
  94 {
  95         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
  96         acpi_handle ahandle = ACPI_HANDLE(pdev->dev);
  97         struct acpi_object_list apts_if_arg_list;
  98         union acpi_object apts_if_args[3];
  99         acpi_status status;
 100
 101         apts_if_arg_list.count = 3;
 102         apts_if_arg_list.pointer = &apts_if_args[0];
 103
 104         apts_if_args[0].type = ACPI_TYPE_INTEGER;
 105         apts_if_args[0].integer.value = 1;
 106         apts_if_args[1].type = ACPI_TYPE_INTEGER;
 107         apts_if_args[1].integer.value = state_index;
 108         apts_if_args[2].type = ACPI_TYPE_INTEGER;
 109         apts_if_args[2].integer.value = 0;
 110
 111         status = acpi_evaluate_object(ahandle, "APTS", &apts_if_arg_list, &buffer);
 112         if (ACPI_FAILURE(status)) {
 113                 dev_err(pdev->dev, "APTS state_idx:%u call failed\n", state_index);
 114                 kfree(buffer.pointer);
 115                 return NULL;
 116         }
 117
 118         return buffer.pointer;
 119 }
 120
 121 static int apts_if_call_store_buffer(struct amd_pmf_dev *pdev,
 122                                      u32 index, void *data, size_t out_sz)
 123 {
 124         union acpi_object *info;
 125         size_t size;
 126         int err = 0;
 127
 128         info = apts_if_call(pdev, index);
 129         if (!info)
 130                 return -EIO;
 131
 132         if (info->type != ACPI_TYPE_BUFFER) {
 133                 dev_err(pdev->dev, "object is not a buffer\n");
 134                 err = -EINVAL;
 135                 goto out;
 136         }
 137
 138         size = *(u16 *)info->buffer.pointer;
 139         if (info->buffer.length < size) {
 140                 dev_err(pdev->dev, "buffer smaller than header size %u < %zu\n",
 141                         info->buffer.length, size);
 142                 err = -EINVAL;
 143                 goto out;
 144         }
 145
 146         if (size < out_sz) {
 147                 dev_err(pdev->dev, "buffer too small %zu\n", size);
 148                 err = -EINVAL;
 149                 goto out;
 150         }
 151
 152         memcpy(data, info->buffer.pointer, out_sz);
 153 out:
 154         kfree(info);
 155         return err;
 156 }
 157
 158 int is_apmf_func_supported(struct amd_pmf_dev *pdev, unsigned long index)
 159 {
 160         /* If bit-n is set, that indicates function n+1 is supported */
 161         return !!(pdev->supported_func & BIT(index - 1));
 162 }
 163
 164 int apts_get_static_slider_granular_v2(struct amd_pmf_dev *pdev,
 165                                        struct amd_pmf_apts_granular_output *data, u32 apts_idx)
 166 {
 167         if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
 168                 return -EINVAL;
 169
 170         return apts_if_call_store_buffer(pdev, apts_idx, data, sizeof(*data));
 171 }
 172
 173 int apmf_get_static_slider_granular_v2(struct amd_pmf_dev *pdev,
 174                                        struct apmf_static_slider_granular_output_v2 *data)
 175 {
 176         if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
 177                 return -EINVAL;
 178
 179         return apmf_if_call_store_buffer(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR,
 180                                          data, sizeof(*data));
 181 }
 182
 183 int apmf_get_static_slider_granular(struct amd_pmf_dev *pdev,
 184                                     struct apmf_static_slider_granular_output *data)
 185 {
 186         if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
 187                 return -EINVAL;
 188
 189         return apmf_if_call_store_buffer(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR,
 190                                                                          data, sizeof(*data));
 191 }
 192
 193 int apmf_os_power_slider_update(struct amd_pmf_dev *pdev, u8 event)
 194 {
 195         struct os_power_slider args;
 196         struct acpi_buffer params;
 197         union acpi_object *info;
 198
 199         args.size = sizeof(args);
 200         args.slider_event = event;
 201
 202         params.length = sizeof(args);
 203         params.pointer = (void *)&args;
 204
 205         info = apmf_if_call(pdev, APMF_FUNC_OS_POWER_SLIDER_UPDATE, &params);
 206         if (!info)
 207                 return -EIO;
 208
 209         kfree(info);
 210         return 0;
 211 }
 212
 213 static void apmf_sbios_heartbeat_notify(struct work_struct *work)
 214 {
 215         struct amd_pmf_dev *dev = container_of(work, struct amd_pmf_dev, heart_beat.work);
 216         union acpi_object *info;
 217
 218         dev_dbg(dev->dev, "Sending heartbeat to SBIOS\n");
 219         info = apmf_if_call(dev, APMF_FUNC_SBIOS_HEARTBEAT, NULL);
 220         if (!info)
 221                 return;
 222
 223         schedule_delayed_work(&dev->heart_beat, msecs_to_jiffies(dev->hb_interval * 1000));
 224         kfree(info);
 225 }
 226
 227 int amd_pmf_notify_sbios_heartbeat_event_v2(struct amd_pmf_dev *dev, u8 flag)
 228 {
 229         struct sbios_hb_event_v2 args = { };
 230         struct acpi_buffer params;
 231         union acpi_object *info;
 232
 233         args.size = sizeof(args);
 234
 235         switch (flag) {
 236         case ON_LOAD:
 237                 args.load = 1;
 238                 break;
 239         case ON_UNLOAD:
 240                 args.unload = 1;
 241                 break;
 242         case ON_SUSPEND:
 243                 args.suspend = 1;
 244                 break;
 245         case ON_RESUME:
 246                 args.resume = 1;
 247                 break;
 248         default:
 249                 dev_dbg(dev->dev, "Failed to send v2 heartbeat event, flag:0x%x\n", flag);
 250                 return -EINVAL;
 251         }
 252
 253         params.length = sizeof(args);
 254         params.pointer = &args;
 255
 256         info = apmf_if_call(dev, APMF_FUNC_SBIOS_HEARTBEAT_V2, &params);
 257         if (!info)
 258                 return -EIO;
 259
 260         kfree(info);
 261         return 0;
 262 }
 263
 264 int apmf_update_fan_idx(struct amd_pmf_dev *pdev, bool manual, u32 idx)
 265 {
 266         union acpi_object *info;
 267         struct apmf_fan_idx args;
 268         struct acpi_buffer params;
 269
 270         args.size = sizeof(args);
 271         args.fan_ctl_mode = manual;
 272         args.fan_ctl_idx = idx;
 273
 274         params.length = sizeof(args);
 275         params.pointer = (void *)&args;
 276
 277         info = apmf_if_call(pdev, APMF_FUNC_SET_FAN_IDX, &params);
 278         if (!info)
 279                 return -EIO;
 280
 281         kfree(info);
 282         return 0;
 283 }
 284
 285 int apmf_get_auto_mode_def(struct amd_pmf_dev *pdev, struct apmf_auto_mode *data)
 286 {
 287         return apmf_if_call_store_buffer(pdev, APMF_FUNC_AUTO_MODE, data, sizeof(*data));
 288 }
 289
 290 int apmf_get_sbios_requests_v2(struct amd_pmf_dev *pdev, struct apmf_sbios_req_v2 *req)
 291 {
 292         return apmf_if_call_store_buffer(pdev, APMF_FUNC_SBIOS_REQUESTS, req, sizeof(*req));
 293 }
 294
 295 int apmf_get_sbios_requests(struct amd_pmf_dev *pdev, struct apmf_sbios_req *req)
 296 {
 297         return apmf_if_call_store_buffer(pdev, APMF_FUNC_SBIOS_REQUESTS,
 298                                                                          req, sizeof(*req));
 299 }
 300
 301 static void apmf_event_handler(acpi_handle handle, u32 event, void *data)
 302 {
 303         struct amd_pmf_dev *pmf_dev = data;
 304         struct apmf_sbios_req req;
 305         int ret;
 306
 307         mutex_lock(&pmf_dev->update_mutex);
 308         ret = apmf_get_sbios_requests(pmf_dev, &req);
 309         if (ret) {
 310                 dev_err(pmf_dev->dev, "Failed to get SBIOS requests:%d\n", ret);
 311                 goto out;
 312         }
 313
 314         if (req.pending_req & BIT(APMF_AMT_NOTIFICATION)) {
 315                 dev_dbg(pmf_dev->dev, "AMT is supported and notifications %s\n",
 316                         req.amt_event ? "Enabled" : "Disabled");
 317                 pmf_dev->amt_enabled = !!req.amt_event;
 318
 319                 if (pmf_dev->amt_enabled)
 320                         amd_pmf_handle_amt(pmf_dev);
 321                 else
 322                         amd_pmf_reset_amt(pmf_dev);
 323         }
 324
 325         if (req.pending_req & BIT(APMF_CQL_NOTIFICATION)) {
 326                 dev_dbg(pmf_dev->dev, "CQL is supported and notifications %s\n",
 327                         req.cql_event ? "Enabled" : "Disabled");
 328
 329                 /* update the target mode information */
 330                 if (pmf_dev->amt_enabled)
 331                         amd_pmf_update_2_cql(pmf_dev, req.cql_event);
 332         }
 333 out:
 334         mutex_unlock(&pmf_dev->update_mutex);
 335 }
 336
 337 static int apmf_if_verify_interface(struct amd_pmf_dev *pdev)
 338 {
 339         struct apmf_verify_interface output;
 340         int err;
 341
 342         err = apmf_if_call_store_buffer(pdev, APMF_FUNC_VERIFY_INTERFACE, &output, sizeof(output));
 343         if (err)
 344                 return err;
 345
 346         /* only set if not already set by a quirk */
 347         if (!pdev->supported_func)
 348                 pdev->supported_func = output.supported_functions;
 349
 350         dev_dbg(pdev->dev, "supported functions:0x%x notifications:0x%x version:%u\n",
 351                 output.supported_functions, output.notification_mask, output.version);
 352
 353         pdev->pmf_if_version = output.version;
 354
 355         return 0;
 356 }
 357
 358 static int apmf_get_system_params(struct amd_pmf_dev *dev)
 359 {
 360         struct apmf_system_params params;
 361         int err;
 362
 363         if (!is_apmf_func_supported(dev, APMF_FUNC_GET_SYS_PARAMS))
 364                 return -EINVAL;
 365
 366         err = apmf_if_call_store_buffer(dev, APMF_FUNC_GET_SYS_PARAMS, &params, sizeof(params));
 367         if (err)
 368                 return err;
 369
 370         dev_dbg(dev->dev, "system params mask:0x%x flags:0x%x cmd_code:0x%x heartbeat:%d\n",
 371                 params.valid_mask,
 372                 params.flags,
 373                 params.command_code,
 374                 params.heartbeat_int);
 375         params.flags = params.flags & params.valid_mask;
 376         dev->hb_interval = params.heartbeat_int;
 377
 378         return 0;
 379 }
 380
 381 int apmf_get_dyn_slider_def_ac(struct amd_pmf_dev *pdev, struct apmf_dyn_slider_output *data)
 382 {
 383         return apmf_if_call_store_buffer(pdev, APMF_FUNC_DYN_SLIDER_AC, data, sizeof(*data));
 384 }
 385
 386 int apmf_get_dyn_slider_def_dc(struct amd_pmf_dev *pdev, struct apmf_dyn_slider_output *data)
 387 {
 388         return apmf_if_call_store_buffer(pdev, APMF_FUNC_DYN_SLIDER_DC, data, sizeof(*data));
 389 }
 390
 391 int apmf_install_handler(struct amd_pmf_dev *pmf_dev)
 392 {
 393         acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
 394         acpi_status status;
 395
 396         /* Install the APMF Notify handler */
 397         if (is_apmf_func_supported(pmf_dev, APMF_FUNC_AUTO_MODE) &&
 398             is_apmf_func_supported(pmf_dev, APMF_FUNC_SBIOS_REQUESTS)) {
 399                 status = acpi_install_notify_handler(ahandle, ACPI_ALL_NOTIFY,
 400                                                      apmf_event_handler, pmf_dev);
 401                 if (ACPI_FAILURE(status)) {
 402                         dev_err(pmf_dev->dev, "failed to install notify handler\n");
 403                         return -ENODEV;
 404                 }
 405
 406                 /* Call the handler once manually to catch up with possibly missed notifies. */
 407                 apmf_event_handler(ahandle, 0, pmf_dev);
 408         }
 409
 410         return 0;
 411 }
 412
 413 static acpi_status apmf_walk_resources(struct acpi_resource *res, void *data)
 414 {
 415         struct amd_pmf_dev *dev = data;
 416
 417         switch (res->type) {
 418         case ACPI_RESOURCE_TYPE_ADDRESS64:
 419                 dev->policy_addr = res->data.address64.address.minimum;
 420                 dev->policy_sz = res->data.address64.address.address_length;
 421                 break;
 422         case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
 423                 dev->policy_addr = res->data.fixed_memory32.address;
 424                 dev->policy_sz = res->data.fixed_memory32.address_length;
 425                 break;
 426         }
 427
 428         if (!dev->policy_addr || dev->policy_sz > POLICY_BUF_MAX_SZ || dev->policy_sz == 0) {
 429                 pr_err("Incorrect Policy params, possibly a SBIOS bug\n");
 430                 return AE_ERROR;
 431         }
 432
 433         return AE_OK;
 434 }
 435
 436 int apmf_check_smart_pc(struct amd_pmf_dev *pmf_dev)
 437 {
 438         acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
 439         acpi_status status;
 440
 441         status = acpi_walk_resources(ahandle, METHOD_NAME__CRS, apmf_walk_resources, pmf_dev);
 442         if (ACPI_FAILURE(status)) {
 443                 dev_dbg(pmf_dev->dev, "acpi_walk_resources failed :%d\n", status);
 444                 return -EINVAL;
 445         }
 446
 447         return 0;
 448 }
 449
 450 void apmf_acpi_deinit(struct amd_pmf_dev *pmf_dev)
 451 {
 452         acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
 453
 454         if (pmf_dev->hb_interval && pmf_dev->pmf_if_version == PMF_IF_V1)
 455                 cancel_delayed_work_sync(&pmf_dev->heart_beat);
 456
 457         if (is_apmf_func_supported(pmf_dev, APMF_FUNC_AUTO_MODE) &&
 458             is_apmf_func_supported(pmf_dev, APMF_FUNC_SBIOS_REQUESTS))
 459                 acpi_remove_notify_handler(ahandle, ACPI_ALL_NOTIFY, apmf_event_handler);
 460 }
 461
 462 int apmf_acpi_init(struct amd_pmf_dev *pmf_dev)
 463 {
 464         int ret;
 465
 466         ret = apmf_if_verify_interface(pmf_dev);
 467         if (ret) {
 468                 dev_err(pmf_dev->dev, "APMF verify interface failed :%d\n", ret);
 469                 goto out;
 470         }
 471
 472         ret = apmf_get_system_params(pmf_dev);
 473         if (ret) {
 474                 dev_dbg(pmf_dev->dev, "APMF apmf_get_system_params failed :%d\n", ret);
 475                 goto out;
 476         }
 477
 478         if (pmf_dev->hb_interval && pmf_dev->pmf_if_version == PMF_IF_V1) {
 479                 /* send heartbeats only if the interval is not zero */
 480                 INIT_DELAYED_WORK(&pmf_dev->heart_beat, apmf_sbios_heartbeat_notify);
 481                 schedule_delayed_work(&pmf_dev->heart_beat, 0);
 482         }
 483
 484 out:
 485         return ret;
 486 }