1 // SPDX-License-Identifier: GPL-2.0-or-later 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 <asm/amd_nb.h> 12 #include <linux/debugfs.h> 13 #include <linux/iopoll.h> 14 #include <linux/module.h> 15 #include <linux/pci.h> 16 #include <linux/platform_device.h> 17 #include <linux/power_supply.h> 18 #include "pmf.h" 19 20 /* PMF-SMU communication registers */ 21 #define AMD_PMF_REGISTER_MESSAGE 0xA18 22 #define AMD_PMF_REGISTER_RESPONSE 0xA78 23 #define AMD_PMF_REGISTER_ARGUMENT 0xA58 24 25 /* Base address of SMU for mapping physical address to virtual address */ 26 #define AMD_PMF_MAPPING_SIZE 0x01000 27 #define AMD_PMF_BASE_ADDR_OFFSET 0x10000 28 #define AMD_PMF_BASE_ADDR_LO 0x13B102E8 29 #define AMD_PMF_BASE_ADDR_HI 0x13B102EC 30 #define AMD_PMF_BASE_ADDR_LO_MASK GENMASK(15, 0) 31 #define AMD_PMF_BASE_ADDR_HI_MASK GENMASK(31, 20) 32 33 /* SMU Response Codes */ 34 #define AMD_PMF_RESULT_OK 0x01 35 #define AMD_PMF_RESULT_CMD_REJECT_BUSY 0xFC 36 #define AMD_PMF_RESULT_CMD_REJECT_PREREQ 0xFD 37 #define AMD_PMF_RESULT_CMD_UNKNOWN 0xFE 38 #define AMD_PMF_RESULT_FAILED 0xFF 39 40 /* List of supported CPU ids */ 41 #define AMD_CPU_ID_RMB 0x14b5 42 #define AMD_CPU_ID_PS 0x14e8 43 44 #define PMF_MSG_DELAY_MIN_US 50 45 #define RESPONSE_REGISTER_LOOP_MAX 20000 46 47 #define DELAY_MIN_US 2000 48 #define DELAY_MAX_US 3000 49 50 /* override Metrics Table sample size time (in ms) */ 51 static int metrics_table_loop_ms = 1000; 52 module_param(metrics_table_loop_ms, int, 0644); 53 MODULE_PARM_DESC(metrics_table_loop_ms, "Metrics Table sample size time (default = 1000ms)"); 54 55 /* Force load on supported older platforms */ 56 static bool force_load; 57 module_param(force_load, bool, 0444); 58 MODULE_PARM_DESC(force_load, "Force load this driver on supported older platforms (experimental)"); 59 60 static int amd_pmf_pwr_src_notify_call(struct notifier_block *nb, unsigned long event, void *data) 61 { 62 struct amd_pmf_dev *pmf = container_of(nb, struct amd_pmf_dev, pwr_src_notifier); 63 64 if (event != PSY_EVENT_PROP_CHANGED) 65 return NOTIFY_OK; 66 67 if (is_apmf_func_supported(pmf, APMF_FUNC_AUTO_MODE) || 68 is_apmf_func_supported(pmf, APMF_FUNC_DYN_SLIDER_DC) || 69 is_apmf_func_supported(pmf, APMF_FUNC_DYN_SLIDER_AC)) { 70 if ((pmf->amt_enabled || pmf->cnqf_enabled) && is_pprof_balanced(pmf)) 71 return NOTIFY_DONE; 72 } 73 74 amd_pmf_set_sps_power_limits(pmf); 75 76 return NOTIFY_OK; 77 } 78 79 static int current_power_limits_show(struct seq_file *seq, void *unused) 80 { 81 struct amd_pmf_dev *dev = seq->private; 82 struct amd_pmf_static_slider_granular table; 83 int mode, src = 0; 84 85 mode = amd_pmf_get_pprof_modes(dev); 86 if (mode < 0) 87 return mode; 88 89 src = amd_pmf_get_power_source(); 90 amd_pmf_update_slider(dev, SLIDER_OP_GET, mode, &table); 91 seq_printf(seq, "spl:%u fppt:%u sppt:%u sppt_apu_only:%u stt_min:%u stt[APU]:%u stt[HS2]: %u\n", 92 table.prop[src][mode].spl, 93 table.prop[src][mode].fppt, 94 table.prop[src][mode].sppt, 95 table.prop[src][mode].sppt_apu_only, 96 table.prop[src][mode].stt_min, 97 table.prop[src][mode].stt_skin_temp[STT_TEMP_APU], 98 table.prop[src][mode].stt_skin_temp[STT_TEMP_HS2]); 99 return 0; 100 } 101 DEFINE_SHOW_ATTRIBUTE(current_power_limits); 102 103 static void amd_pmf_dbgfs_unregister(struct amd_pmf_dev *dev) 104 { 105 debugfs_remove_recursive(dev->dbgfs_dir); 106 } 107 108 static void amd_pmf_dbgfs_register(struct amd_pmf_dev *dev) 109 { 110 dev->dbgfs_dir = debugfs_create_dir("amd_pmf", NULL); 111 debugfs_create_file("current_power_limits", 0644, dev->dbgfs_dir, dev, 112 ¤t_power_limits_fops); 113 } 114 115 int amd_pmf_get_power_source(void) 116 { 117 if (power_supply_is_system_supplied() > 0) 118 return POWER_SOURCE_AC; 119 else 120 return POWER_SOURCE_DC; 121 } 122 123 static void amd_pmf_get_metrics(struct work_struct *work) 124 { 125 struct amd_pmf_dev *dev = container_of(work, struct amd_pmf_dev, work_buffer.work); 126 ktime_t time_elapsed_ms; 127 int socket_power; 128 129 mutex_lock(&dev->update_mutex); 130 /* Transfer table contents */ 131 memset(dev->buf, 0, sizeof(dev->m_table)); 132 amd_pmf_send_cmd(dev, SET_TRANSFER_TABLE, 0, 7, NULL); 133 memcpy(&dev->m_table, dev->buf, sizeof(dev->m_table)); 134 135 time_elapsed_ms = ktime_to_ms(ktime_get()) - dev->start_time; 136 /* Calculate the avg SoC power consumption */ 137 socket_power = dev->m_table.apu_power + dev->m_table.dgpu_power; 138 139 if (dev->amt_enabled) { 140 /* Apply the Auto Mode transition */ 141 amd_pmf_trans_automode(dev, socket_power, time_elapsed_ms); 142 } 143 144 if (dev->cnqf_enabled) { 145 /* Apply the CnQF transition */ 146 amd_pmf_trans_cnqf(dev, socket_power, time_elapsed_ms); 147 } 148 149 dev->start_time = ktime_to_ms(ktime_get()); 150 schedule_delayed_work(&dev->work_buffer, msecs_to_jiffies(metrics_table_loop_ms)); 151 mutex_unlock(&dev->update_mutex); 152 } 153 154 static inline u32 amd_pmf_reg_read(struct amd_pmf_dev *dev, int reg_offset) 155 { 156 return ioread32(dev->regbase + reg_offset); 157 } 158 159 static inline void amd_pmf_reg_write(struct amd_pmf_dev *dev, int reg_offset, u32 val) 160 { 161 iowrite32(val, dev->regbase + reg_offset); 162 } 163 164 static void __maybe_unused amd_pmf_dump_registers(struct amd_pmf_dev *dev) 165 { 166 u32 value; 167 168 value = amd_pmf_reg_read(dev, AMD_PMF_REGISTER_RESPONSE); 169 dev_dbg(dev->dev, "AMD_PMF_REGISTER_RESPONSE:%x\n", value); 170 171 value = amd_pmf_reg_read(dev, AMD_PMF_REGISTER_ARGUMENT); 172 dev_dbg(dev->dev, "AMD_PMF_REGISTER_ARGUMENT:%d\n", value); 173 174 value = amd_pmf_reg_read(dev, AMD_PMF_REGISTER_MESSAGE); 175 dev_dbg(dev->dev, "AMD_PMF_REGISTER_MESSAGE:%x\n", value); 176 } 177 178 int amd_pmf_send_cmd(struct amd_pmf_dev *dev, u8 message, bool get, u32 arg, u32 *data) 179 { 180 int rc; 181 u32 val; 182 183 mutex_lock(&dev->lock); 184 185 /* Wait until we get a valid response */ 186 rc = readx_poll_timeout(ioread32, dev->regbase + AMD_PMF_REGISTER_RESPONSE, 187 val, val != 0, PMF_MSG_DELAY_MIN_US, 188 PMF_MSG_DELAY_MIN_US * RESPONSE_REGISTER_LOOP_MAX); 189 if (rc) { 190 dev_err(dev->dev, "failed to talk to SMU\n"); 191 goto out_unlock; 192 } 193 194 /* Write zero to response register */ 195 amd_pmf_reg_write(dev, AMD_PMF_REGISTER_RESPONSE, 0); 196 197 /* Write argument into argument register */ 198 amd_pmf_reg_write(dev, AMD_PMF_REGISTER_ARGUMENT, arg); 199 200 /* Write message ID to message ID register */ 201 amd_pmf_reg_write(dev, AMD_PMF_REGISTER_MESSAGE, message); 202 203 /* Wait until we get a valid response */ 204 rc = readx_poll_timeout(ioread32, dev->regbase + AMD_PMF_REGISTER_RESPONSE, 205 val, val != 0, PMF_MSG_DELAY_MIN_US, 206 PMF_MSG_DELAY_MIN_US * RESPONSE_REGISTER_LOOP_MAX); 207 if (rc) { 208 dev_err(dev->dev, "SMU response timed out\n"); 209 goto out_unlock; 210 } 211 212 switch (val) { 213 case AMD_PMF_RESULT_OK: 214 if (get) { 215 /* PMFW may take longer time to return back the data */ 216 usleep_range(DELAY_MIN_US, 10 * DELAY_MAX_US); 217 *data = amd_pmf_reg_read(dev, AMD_PMF_REGISTER_ARGUMENT); 218 } 219 break; 220 case AMD_PMF_RESULT_CMD_REJECT_BUSY: 221 dev_err(dev->dev, "SMU not ready. err: 0x%x\n", val); 222 rc = -EBUSY; 223 goto out_unlock; 224 case AMD_PMF_RESULT_CMD_UNKNOWN: 225 dev_err(dev->dev, "SMU cmd unknown. err: 0x%x\n", val); 226 rc = -EINVAL; 227 goto out_unlock; 228 case AMD_PMF_RESULT_CMD_REJECT_PREREQ: 229 case AMD_PMF_RESULT_FAILED: 230 default: 231 dev_err(dev->dev, "SMU cmd failed. err: 0x%x\n", val); 232 rc = -EIO; 233 goto out_unlock; 234 } 235 236 out_unlock: 237 mutex_unlock(&dev->lock); 238 amd_pmf_dump_registers(dev); 239 return rc; 240 } 241 242 static const struct pci_device_id pmf_pci_ids[] = { 243 { PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_RMB) }, 244 { PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_PS) }, 245 { } 246 }; 247 248 int amd_pmf_init_metrics_table(struct amd_pmf_dev *dev) 249 { 250 u64 phys_addr; 251 u32 hi, low; 252 253 INIT_DELAYED_WORK(&dev->work_buffer, amd_pmf_get_metrics); 254 255 /* Get Metrics Table Address */ 256 dev->buf = kzalloc(sizeof(dev->m_table), GFP_KERNEL); 257 if (!dev->buf) 258 return -ENOMEM; 259 260 phys_addr = virt_to_phys(dev->buf); 261 hi = phys_addr >> 32; 262 low = phys_addr & GENMASK(31, 0); 263 264 amd_pmf_send_cmd(dev, SET_DRAM_ADDR_HIGH, 0, hi, NULL); 265 amd_pmf_send_cmd(dev, SET_DRAM_ADDR_LOW, 0, low, NULL); 266 267 /* 268 * Start collecting the metrics data after a small delay 269 * or else, we might end up getting stale values from PMFW. 270 */ 271 schedule_delayed_work(&dev->work_buffer, msecs_to_jiffies(metrics_table_loop_ms * 3)); 272 273 return 0; 274 } 275 276 static void amd_pmf_init_features(struct amd_pmf_dev *dev) 277 { 278 int ret; 279 280 /* Enable Static Slider */ 281 if (is_apmf_func_supported(dev, APMF_FUNC_STATIC_SLIDER_GRANULAR)) { 282 amd_pmf_init_sps(dev); 283 dev_dbg(dev->dev, "SPS enabled and Platform Profiles registered\n"); 284 } 285 286 /* Enable Auto Mode */ 287 if (is_apmf_func_supported(dev, APMF_FUNC_AUTO_MODE)) { 288 amd_pmf_init_auto_mode(dev); 289 dev_dbg(dev->dev, "Auto Mode Init done\n"); 290 } else if (is_apmf_func_supported(dev, APMF_FUNC_DYN_SLIDER_AC) || 291 is_apmf_func_supported(dev, APMF_FUNC_DYN_SLIDER_DC)) { 292 /* Enable Cool n Quiet Framework (CnQF) */ 293 ret = amd_pmf_init_cnqf(dev); 294 if (ret) 295 dev_warn(dev->dev, "CnQF Init failed\n"); 296 } 297 } 298 299 static void amd_pmf_deinit_features(struct amd_pmf_dev *dev) 300 { 301 if (is_apmf_func_supported(dev, APMF_FUNC_STATIC_SLIDER_GRANULAR)) 302 amd_pmf_deinit_sps(dev); 303 304 if (is_apmf_func_supported(dev, APMF_FUNC_AUTO_MODE)) { 305 amd_pmf_deinit_auto_mode(dev); 306 } else if (is_apmf_func_supported(dev, APMF_FUNC_DYN_SLIDER_AC) || 307 is_apmf_func_supported(dev, APMF_FUNC_DYN_SLIDER_DC)) { 308 amd_pmf_deinit_cnqf(dev); 309 } 310 } 311 312 static const struct acpi_device_id amd_pmf_acpi_ids[] = { 313 {"AMDI0100", 0x100}, 314 {"AMDI0102", 0}, 315 { } 316 }; 317 MODULE_DEVICE_TABLE(acpi, amd_pmf_acpi_ids); 318 319 static int amd_pmf_probe(struct platform_device *pdev) 320 { 321 const struct acpi_device_id *id; 322 struct amd_pmf_dev *dev; 323 struct pci_dev *rdev; 324 u32 base_addr_lo; 325 u32 base_addr_hi; 326 u64 base_addr; 327 u32 val; 328 int err; 329 330 id = acpi_match_device(amd_pmf_acpi_ids, &pdev->dev); 331 if (!id) 332 return -ENODEV; 333 334 if (id->driver_data == 0x100 && !force_load) 335 return -ENODEV; 336 337 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); 338 if (!dev) 339 return -ENOMEM; 340 341 dev->dev = &pdev->dev; 342 343 rdev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(0, 0)); 344 if (!rdev || !pci_match_id(pmf_pci_ids, rdev)) { 345 pci_dev_put(rdev); 346 return -ENODEV; 347 } 348 349 dev->cpu_id = rdev->device; 350 351 err = amd_smn_read(0, AMD_PMF_BASE_ADDR_LO, &val); 352 if (err) { 353 dev_err(dev->dev, "error in reading from 0x%x\n", AMD_PMF_BASE_ADDR_LO); 354 pci_dev_put(rdev); 355 return pcibios_err_to_errno(err); 356 } 357 358 base_addr_lo = val & AMD_PMF_BASE_ADDR_HI_MASK; 359 360 err = amd_smn_read(0, AMD_PMF_BASE_ADDR_HI, &val); 361 if (err) { 362 dev_err(dev->dev, "error in reading from 0x%x\n", AMD_PMF_BASE_ADDR_HI); 363 pci_dev_put(rdev); 364 return pcibios_err_to_errno(err); 365 } 366 367 base_addr_hi = val & AMD_PMF_BASE_ADDR_LO_MASK; 368 pci_dev_put(rdev); 369 base_addr = ((u64)base_addr_hi << 32 | base_addr_lo); 370 371 dev->regbase = devm_ioremap(dev->dev, base_addr + AMD_PMF_BASE_ADDR_OFFSET, 372 AMD_PMF_MAPPING_SIZE); 373 if (!dev->regbase) 374 return -ENOMEM; 375 376 mutex_init(&dev->lock); 377 mutex_init(&dev->update_mutex); 378 379 apmf_acpi_init(dev); 380 platform_set_drvdata(pdev, dev); 381 amd_pmf_init_features(dev); 382 apmf_install_handler(dev); 383 amd_pmf_dbgfs_register(dev); 384 385 dev->pwr_src_notifier.notifier_call = amd_pmf_pwr_src_notify_call; 386 power_supply_reg_notifier(&dev->pwr_src_notifier); 387 388 dev_info(dev->dev, "registered PMF device successfully\n"); 389 390 return 0; 391 } 392 393 static void amd_pmf_remove(struct platform_device *pdev) 394 { 395 struct amd_pmf_dev *dev = platform_get_drvdata(pdev); 396 397 power_supply_unreg_notifier(&dev->pwr_src_notifier); 398 amd_pmf_deinit_features(dev); 399 apmf_acpi_deinit(dev); 400 amd_pmf_dbgfs_unregister(dev); 401 mutex_destroy(&dev->lock); 402 mutex_destroy(&dev->update_mutex); 403 kfree(dev->buf); 404 } 405 406 static const struct attribute_group *amd_pmf_driver_groups[] = { 407 &cnqf_feature_attribute_group, 408 NULL, 409 }; 410 411 static struct platform_driver amd_pmf_driver = { 412 .driver = { 413 .name = "amd-pmf", 414 .acpi_match_table = amd_pmf_acpi_ids, 415 .dev_groups = amd_pmf_driver_groups, 416 }, 417 .probe = amd_pmf_probe, 418 .remove_new = amd_pmf_remove, 419 }; 420 module_platform_driver(amd_pmf_driver); 421 422 MODULE_LICENSE("GPL"); 423 MODULE_DESCRIPTION("AMD Platform Management Framework Driver"); 424