Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 1 | /* |
| 2 | * x86_pkg_temp_thermal driver |
| 3 | * Copyright (c) 2013, Intel Corporation. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms and conditions of the GNU General Public License, |
| 7 | * version 2, as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along with |
| 15 | * this program; if not, write to the Free Software Foundation, Inc. |
| 16 | * |
| 17 | */ |
| 18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 19 | |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/err.h> |
| 23 | #include <linux/param.h> |
| 24 | #include <linux/device.h> |
| 25 | #include <linux/platform_device.h> |
| 26 | #include <linux/cpu.h> |
| 27 | #include <linux/smp.h> |
| 28 | #include <linux/slab.h> |
| 29 | #include <linux/pm.h> |
| 30 | #include <linux/thermal.h> |
| 31 | #include <linux/debugfs.h> |
| 32 | #include <asm/cpu_device_id.h> |
| 33 | #include <asm/mce.h> |
| 34 | |
| 35 | /* |
| 36 | * Rate control delay: Idea is to introduce denounce effect |
| 37 | * This should be long enough to avoid reduce events, when |
| 38 | * threshold is set to a temperature, which is constantly |
| 39 | * violated, but at the short enough to take any action. |
| 40 | * The action can be remove threshold or change it to next |
| 41 | * interesting setting. Based on experiments, in around |
| 42 | * every 5 seconds under load will give us a significant |
| 43 | * temperature change. |
| 44 | */ |
| 45 | #define PKG_TEMP_THERMAL_NOTIFY_DELAY 5000 |
| 46 | static int notify_delay_ms = PKG_TEMP_THERMAL_NOTIFY_DELAY; |
| 47 | module_param(notify_delay_ms, int, 0644); |
| 48 | MODULE_PARM_DESC(notify_delay_ms, |
| 49 | "User space notification delay in milli seconds."); |
| 50 | |
| 51 | /* Number of trip points in thermal zone. Currently it can't |
| 52 | * be more than 2. MSR can allow setting and getting notifications |
| 53 | * for only 2 thresholds. This define enforces this, if there |
| 54 | * is some wrong values returned by cpuid for number of thresholds. |
| 55 | */ |
| 56 | #define MAX_NUMBER_OF_TRIPS 2 |
Srinivas Pandruvada | 94e791f | 2013-07-15 15:38:52 -0700 | [diff] [blame] | 57 | /* Limit number of package temp zones */ |
| 58 | #define MAX_PKG_TEMP_ZONE_IDS 256 |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 59 | |
| 60 | struct phy_dev_entry { |
| 61 | struct list_head list; |
| 62 | u16 phys_proc_id; |
| 63 | u16 first_cpu; |
| 64 | u32 tj_max; |
| 65 | int ref_cnt; |
| 66 | u32 start_pkg_therm_low; |
| 67 | u32 start_pkg_therm_high; |
| 68 | struct thermal_zone_device *tzone; |
| 69 | }; |
| 70 | |
Javi Merino | 4abe602 | 2015-03-03 15:30:50 +0000 | [diff] [blame] | 71 | static struct thermal_zone_params pkg_temp_tz_params = { |
Jean Delvare | 7978688 | 2014-03-02 15:33:35 +0100 | [diff] [blame] | 72 | .no_hwmon = true, |
| 73 | }; |
| 74 | |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 75 | /* List maintaining number of package instances */ |
| 76 | static LIST_HEAD(phy_dev_list); |
| 77 | static DEFINE_MUTEX(phy_dev_list_mutex); |
| 78 | |
| 79 | /* Interrupt to work function schedule queue */ |
| 80 | static DEFINE_PER_CPU(struct delayed_work, pkg_temp_thermal_threshold_work); |
| 81 | |
| 82 | /* To track if the work is already scheduled on a package */ |
| 83 | static u8 *pkg_work_scheduled; |
| 84 | |
| 85 | /* Spin lock to prevent races with pkg_work_scheduled */ |
| 86 | static spinlock_t pkg_work_lock; |
| 87 | static u16 max_phy_id; |
| 88 | |
| 89 | /* Debug counters to show using debugfs */ |
| 90 | static struct dentry *debugfs; |
| 91 | static unsigned int pkg_interrupt_cnt; |
| 92 | static unsigned int pkg_work_cnt; |
| 93 | |
| 94 | static int pkg_temp_debugfs_init(void) |
| 95 | { |
| 96 | struct dentry *d; |
| 97 | |
| 98 | debugfs = debugfs_create_dir("pkg_temp_thermal", NULL); |
| 99 | if (!debugfs) |
| 100 | return -ENOENT; |
| 101 | |
| 102 | d = debugfs_create_u32("pkg_thres_interrupt", S_IRUGO, debugfs, |
| 103 | (u32 *)&pkg_interrupt_cnt); |
| 104 | if (!d) |
| 105 | goto err_out; |
| 106 | |
| 107 | d = debugfs_create_u32("pkg_thres_work", S_IRUGO, debugfs, |
| 108 | (u32 *)&pkg_work_cnt); |
| 109 | if (!d) |
| 110 | goto err_out; |
| 111 | |
| 112 | return 0; |
| 113 | |
| 114 | err_out: |
| 115 | debugfs_remove_recursive(debugfs); |
| 116 | return -ENOENT; |
| 117 | } |
| 118 | |
| 119 | static struct phy_dev_entry |
| 120 | *pkg_temp_thermal_get_phy_entry(unsigned int cpu) |
| 121 | { |
| 122 | u16 phys_proc_id = topology_physical_package_id(cpu); |
| 123 | struct phy_dev_entry *phy_ptr; |
| 124 | |
| 125 | mutex_lock(&phy_dev_list_mutex); |
| 126 | |
| 127 | list_for_each_entry(phy_ptr, &phy_dev_list, list) |
| 128 | if (phy_ptr->phys_proc_id == phys_proc_id) { |
| 129 | mutex_unlock(&phy_dev_list_mutex); |
| 130 | return phy_ptr; |
| 131 | } |
| 132 | |
| 133 | mutex_unlock(&phy_dev_list_mutex); |
| 134 | |
| 135 | return NULL; |
| 136 | } |
| 137 | |
| 138 | /* |
| 139 | * tj-max is is interesting because threshold is set relative to this |
| 140 | * temperature. |
| 141 | */ |
| 142 | static int get_tj_max(int cpu, u32 *tj_max) |
| 143 | { |
| 144 | u32 eax, edx; |
| 145 | u32 val; |
| 146 | int err; |
| 147 | |
| 148 | err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx); |
| 149 | if (err) |
| 150 | goto err_ret; |
| 151 | else { |
| 152 | val = (eax >> 16) & 0xff; |
| 153 | if (val) |
| 154 | *tj_max = val * 1000; |
| 155 | else { |
| 156 | err = -EINVAL; |
| 157 | goto err_ret; |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | return 0; |
| 162 | err_ret: |
| 163 | *tj_max = 0; |
| 164 | return err; |
| 165 | } |
| 166 | |
Sascha Hauer | 17e8351 | 2015-07-24 08:12:54 +0200 | [diff] [blame] | 167 | static int sys_get_curr_temp(struct thermal_zone_device *tzd, int *temp) |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 168 | { |
| 169 | u32 eax, edx; |
| 170 | struct phy_dev_entry *phy_dev_entry; |
| 171 | |
| 172 | phy_dev_entry = tzd->devdata; |
| 173 | rdmsr_on_cpu(phy_dev_entry->first_cpu, MSR_IA32_PACKAGE_THERM_STATUS, |
| 174 | &eax, &edx); |
| 175 | if (eax & 0x80000000) { |
| 176 | *temp = phy_dev_entry->tj_max - |
| 177 | ((eax >> 16) & 0x7f) * 1000; |
Sascha Hauer | 17e8351 | 2015-07-24 08:12:54 +0200 | [diff] [blame] | 178 | pr_debug("sys_get_curr_temp %d\n", *temp); |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | return -EINVAL; |
| 183 | } |
| 184 | |
| 185 | static int sys_get_trip_temp(struct thermal_zone_device *tzd, |
Sascha Hauer | 17e8351 | 2015-07-24 08:12:54 +0200 | [diff] [blame] | 186 | int trip, int *temp) |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 187 | { |
| 188 | u32 eax, edx; |
| 189 | struct phy_dev_entry *phy_dev_entry; |
| 190 | u32 mask, shift; |
| 191 | unsigned long thres_reg_value; |
| 192 | int ret; |
| 193 | |
| 194 | if (trip >= MAX_NUMBER_OF_TRIPS) |
| 195 | return -EINVAL; |
| 196 | |
| 197 | phy_dev_entry = tzd->devdata; |
| 198 | |
| 199 | if (trip) { |
| 200 | mask = THERM_MASK_THRESHOLD1; |
| 201 | shift = THERM_SHIFT_THRESHOLD1; |
| 202 | } else { |
| 203 | mask = THERM_MASK_THRESHOLD0; |
| 204 | shift = THERM_SHIFT_THRESHOLD0; |
| 205 | } |
| 206 | |
| 207 | ret = rdmsr_on_cpu(phy_dev_entry->first_cpu, |
| 208 | MSR_IA32_PACKAGE_THERM_INTERRUPT, &eax, &edx); |
| 209 | if (ret < 0) |
| 210 | return -EINVAL; |
| 211 | |
| 212 | thres_reg_value = (eax & mask) >> shift; |
| 213 | if (thres_reg_value) |
| 214 | *temp = phy_dev_entry->tj_max - thres_reg_value * 1000; |
| 215 | else |
| 216 | *temp = 0; |
Sascha Hauer | 17e8351 | 2015-07-24 08:12:54 +0200 | [diff] [blame] | 217 | pr_debug("sys_get_trip_temp %d\n", *temp); |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 218 | |
| 219 | return 0; |
| 220 | } |
| 221 | |
Rashika | f67fe3c | 2013-12-18 23:16:02 +0530 | [diff] [blame] | 222 | static int sys_set_trip_temp(struct thermal_zone_device *tzd, int trip, |
Sascha Hauer | 17e8351 | 2015-07-24 08:12:54 +0200 | [diff] [blame] | 223 | int temp) |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 224 | { |
| 225 | u32 l, h; |
| 226 | struct phy_dev_entry *phy_dev_entry; |
| 227 | u32 mask, shift, intr; |
| 228 | int ret; |
| 229 | |
| 230 | phy_dev_entry = tzd->devdata; |
| 231 | |
| 232 | if (trip >= MAX_NUMBER_OF_TRIPS || temp >= phy_dev_entry->tj_max) |
| 233 | return -EINVAL; |
| 234 | |
| 235 | ret = rdmsr_on_cpu(phy_dev_entry->first_cpu, |
| 236 | MSR_IA32_PACKAGE_THERM_INTERRUPT, |
| 237 | &l, &h); |
| 238 | if (ret < 0) |
| 239 | return -EINVAL; |
| 240 | |
| 241 | if (trip) { |
| 242 | mask = THERM_MASK_THRESHOLD1; |
| 243 | shift = THERM_SHIFT_THRESHOLD1; |
| 244 | intr = THERM_INT_THRESHOLD1_ENABLE; |
| 245 | } else { |
| 246 | mask = THERM_MASK_THRESHOLD0; |
| 247 | shift = THERM_SHIFT_THRESHOLD0; |
| 248 | intr = THERM_INT_THRESHOLD0_ENABLE; |
| 249 | } |
| 250 | l &= ~mask; |
| 251 | /* |
| 252 | * When users space sets a trip temperature == 0, which is indication |
| 253 | * that, it is no longer interested in receiving notifications. |
| 254 | */ |
| 255 | if (!temp) |
| 256 | l &= ~intr; |
| 257 | else { |
| 258 | l |= (phy_dev_entry->tj_max - temp)/1000 << shift; |
| 259 | l |= intr; |
| 260 | } |
| 261 | |
| 262 | return wrmsr_on_cpu(phy_dev_entry->first_cpu, |
| 263 | MSR_IA32_PACKAGE_THERM_INTERRUPT, |
| 264 | l, h); |
| 265 | } |
| 266 | |
| 267 | static int sys_get_trip_type(struct thermal_zone_device *thermal, |
| 268 | int trip, enum thermal_trip_type *type) |
| 269 | { |
| 270 | |
| 271 | *type = THERMAL_TRIP_PASSIVE; |
| 272 | |
| 273 | return 0; |
| 274 | } |
| 275 | |
| 276 | /* Thermal zone callback registry */ |
| 277 | static struct thermal_zone_device_ops tzone_ops = { |
| 278 | .get_temp = sys_get_curr_temp, |
| 279 | .get_trip_temp = sys_get_trip_temp, |
| 280 | .get_trip_type = sys_get_trip_type, |
| 281 | .set_trip_temp = sys_set_trip_temp, |
| 282 | }; |
| 283 | |
| 284 | static bool pkg_temp_thermal_platform_thermal_rate_control(void) |
| 285 | { |
| 286 | return true; |
| 287 | } |
| 288 | |
| 289 | /* Enable threshold interrupt on local package/cpu */ |
| 290 | static inline void enable_pkg_thres_interrupt(void) |
| 291 | { |
| 292 | u32 l, h; |
| 293 | u8 thres_0, thres_1; |
| 294 | |
| 295 | rdmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h); |
| 296 | /* only enable/disable if it had valid threshold value */ |
| 297 | thres_0 = (l & THERM_MASK_THRESHOLD0) >> THERM_SHIFT_THRESHOLD0; |
| 298 | thres_1 = (l & THERM_MASK_THRESHOLD1) >> THERM_SHIFT_THRESHOLD1; |
| 299 | if (thres_0) |
| 300 | l |= THERM_INT_THRESHOLD0_ENABLE; |
| 301 | if (thres_1) |
| 302 | l |= THERM_INT_THRESHOLD1_ENABLE; |
| 303 | wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h); |
| 304 | } |
| 305 | |
| 306 | /* Disable threshold interrupt on local package/cpu */ |
| 307 | static inline void disable_pkg_thres_interrupt(void) |
| 308 | { |
| 309 | u32 l, h; |
| 310 | rdmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h); |
| 311 | wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, |
| 312 | l & (~THERM_INT_THRESHOLD0_ENABLE) & |
| 313 | (~THERM_INT_THRESHOLD1_ENABLE), h); |
| 314 | } |
| 315 | |
| 316 | static void pkg_temp_thermal_threshold_work_fn(struct work_struct *work) |
| 317 | { |
| 318 | __u64 msr_val; |
| 319 | int cpu = smp_processor_id(); |
| 320 | int phy_id = topology_physical_package_id(cpu); |
| 321 | struct phy_dev_entry *phdev = pkg_temp_thermal_get_phy_entry(cpu); |
| 322 | bool notify = false; |
Srinivas Pandruvada | 7bed1b3 | 2013-09-24 11:05:16 -0700 | [diff] [blame] | 323 | unsigned long flags; |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 324 | |
| 325 | if (!phdev) |
| 326 | return; |
| 327 | |
Srinivas Pandruvada | 7bed1b3 | 2013-09-24 11:05:16 -0700 | [diff] [blame] | 328 | spin_lock_irqsave(&pkg_work_lock, flags); |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 329 | ++pkg_work_cnt; |
| 330 | if (unlikely(phy_id > max_phy_id)) { |
Srinivas Pandruvada | 7bed1b3 | 2013-09-24 11:05:16 -0700 | [diff] [blame] | 331 | spin_unlock_irqrestore(&pkg_work_lock, flags); |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 332 | return; |
| 333 | } |
| 334 | pkg_work_scheduled[phy_id] = 0; |
Srinivas Pandruvada | 7bed1b3 | 2013-09-24 11:05:16 -0700 | [diff] [blame] | 335 | spin_unlock_irqrestore(&pkg_work_lock, flags); |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 336 | |
| 337 | enable_pkg_thres_interrupt(); |
| 338 | rdmsrl(MSR_IA32_PACKAGE_THERM_STATUS, msr_val); |
| 339 | if (msr_val & THERM_LOG_THRESHOLD0) { |
| 340 | wrmsrl(MSR_IA32_PACKAGE_THERM_STATUS, |
| 341 | msr_val & ~THERM_LOG_THRESHOLD0); |
| 342 | notify = true; |
| 343 | } |
| 344 | if (msr_val & THERM_LOG_THRESHOLD1) { |
| 345 | wrmsrl(MSR_IA32_PACKAGE_THERM_STATUS, |
| 346 | msr_val & ~THERM_LOG_THRESHOLD1); |
| 347 | notify = true; |
| 348 | } |
| 349 | if (notify) { |
| 350 | pr_debug("thermal_zone_device_update\n"); |
| 351 | thermal_zone_device_update(phdev->tzone); |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val) |
| 356 | { |
| 357 | unsigned long flags; |
| 358 | int cpu = smp_processor_id(); |
| 359 | int phy_id = topology_physical_package_id(cpu); |
| 360 | |
| 361 | /* |
| 362 | * When a package is in interrupted state, all CPU's in that package |
| 363 | * are in the same interrupt state. So scheduling on any one CPU in |
| 364 | * the package is enough and simply return for others. |
| 365 | */ |
| 366 | spin_lock_irqsave(&pkg_work_lock, flags); |
| 367 | ++pkg_interrupt_cnt; |
| 368 | if (unlikely(phy_id > max_phy_id) || unlikely(!pkg_work_scheduled) || |
| 369 | pkg_work_scheduled[phy_id]) { |
| 370 | disable_pkg_thres_interrupt(); |
| 371 | spin_unlock_irqrestore(&pkg_work_lock, flags); |
| 372 | return -EINVAL; |
| 373 | } |
| 374 | pkg_work_scheduled[phy_id] = 1; |
| 375 | spin_unlock_irqrestore(&pkg_work_lock, flags); |
| 376 | |
| 377 | disable_pkg_thres_interrupt(); |
| 378 | schedule_delayed_work_on(cpu, |
| 379 | &per_cpu(pkg_temp_thermal_threshold_work, cpu), |
| 380 | msecs_to_jiffies(notify_delay_ms)); |
| 381 | return 0; |
| 382 | } |
| 383 | |
| 384 | static int find_siblings_cpu(int cpu) |
| 385 | { |
| 386 | int i; |
| 387 | int id = topology_physical_package_id(cpu); |
| 388 | |
| 389 | for_each_online_cpu(i) |
| 390 | if (i != cpu && topology_physical_package_id(i) == id) |
| 391 | return i; |
| 392 | |
| 393 | return 0; |
| 394 | } |
| 395 | |
| 396 | static int pkg_temp_thermal_device_add(unsigned int cpu) |
| 397 | { |
| 398 | int err; |
| 399 | u32 tj_max; |
| 400 | struct phy_dev_entry *phy_dev_entry; |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 401 | int thres_count; |
| 402 | u32 eax, ebx, ecx, edx; |
Wei Yongjun | c7c1b31 | 2013-06-18 21:09:12 +0800 | [diff] [blame] | 403 | u8 *temp; |
Srinivas Pandruvada | 7bed1b3 | 2013-09-24 11:05:16 -0700 | [diff] [blame] | 404 | unsigned long flags; |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 405 | |
| 406 | cpuid(6, &eax, &ebx, &ecx, &edx); |
| 407 | thres_count = ebx & 0x07; |
| 408 | if (!thres_count) |
| 409 | return -ENODEV; |
| 410 | |
Srinivas Pandruvada | 94e791f | 2013-07-15 15:38:52 -0700 | [diff] [blame] | 411 | if (topology_physical_package_id(cpu) > MAX_PKG_TEMP_ZONE_IDS) |
| 412 | return -ENODEV; |
| 413 | |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 414 | thres_count = clamp_val(thres_count, 0, MAX_NUMBER_OF_TRIPS); |
| 415 | |
| 416 | err = get_tj_max(cpu, &tj_max); |
| 417 | if (err) |
| 418 | goto err_ret; |
| 419 | |
| 420 | mutex_lock(&phy_dev_list_mutex); |
| 421 | |
| 422 | phy_dev_entry = kzalloc(sizeof(*phy_dev_entry), GFP_KERNEL); |
| 423 | if (!phy_dev_entry) { |
| 424 | err = -ENOMEM; |
| 425 | goto err_ret_unlock; |
| 426 | } |
| 427 | |
Srinivas Pandruvada | 7bed1b3 | 2013-09-24 11:05:16 -0700 | [diff] [blame] | 428 | spin_lock_irqsave(&pkg_work_lock, flags); |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 429 | if (topology_physical_package_id(cpu) > max_phy_id) |
| 430 | max_phy_id = topology_physical_package_id(cpu); |
Wei Yongjun | c7c1b31 | 2013-06-18 21:09:12 +0800 | [diff] [blame] | 431 | temp = krealloc(pkg_work_scheduled, |
| 432 | (max_phy_id+1) * sizeof(u8), GFP_ATOMIC); |
| 433 | if (!temp) { |
Srinivas Pandruvada | 7bed1b3 | 2013-09-24 11:05:16 -0700 | [diff] [blame] | 434 | spin_unlock_irqrestore(&pkg_work_lock, flags); |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 435 | err = -ENOMEM; |
| 436 | goto err_ret_free; |
| 437 | } |
Wei Yongjun | c7c1b31 | 2013-06-18 21:09:12 +0800 | [diff] [blame] | 438 | pkg_work_scheduled = temp; |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 439 | pkg_work_scheduled[topology_physical_package_id(cpu)] = 0; |
Srinivas Pandruvada | 7bed1b3 | 2013-09-24 11:05:16 -0700 | [diff] [blame] | 440 | spin_unlock_irqrestore(&pkg_work_lock, flags); |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 441 | |
| 442 | phy_dev_entry->phys_proc_id = topology_physical_package_id(cpu); |
| 443 | phy_dev_entry->first_cpu = cpu; |
| 444 | phy_dev_entry->tj_max = tj_max; |
| 445 | phy_dev_entry->ref_cnt = 1; |
Jean Delvare | 3e42165 | 2014-03-02 15:05:49 +0100 | [diff] [blame] | 446 | phy_dev_entry->tzone = thermal_zone_device_register("x86_pkg_temp", |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 447 | thres_count, |
| 448 | (thres_count == MAX_NUMBER_OF_TRIPS) ? |
| 449 | 0x03 : 0x01, |
Jean Delvare | 7978688 | 2014-03-02 15:33:35 +0100 | [diff] [blame] | 450 | phy_dev_entry, &tzone_ops, &pkg_temp_tz_params, 0, 0); |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 451 | if (IS_ERR(phy_dev_entry->tzone)) { |
| 452 | err = PTR_ERR(phy_dev_entry->tzone); |
| 453 | goto err_ret_free; |
| 454 | } |
| 455 | /* Store MSR value for package thermal interrupt, to restore at exit */ |
| 456 | rdmsr_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT, |
| 457 | &phy_dev_entry->start_pkg_therm_low, |
| 458 | &phy_dev_entry->start_pkg_therm_high); |
| 459 | |
| 460 | list_add_tail(&phy_dev_entry->list, &phy_dev_list); |
| 461 | pr_debug("pkg_temp_thermal_device_add :phy_id %d cpu %d\n", |
| 462 | phy_dev_entry->phys_proc_id, cpu); |
| 463 | |
| 464 | mutex_unlock(&phy_dev_list_mutex); |
| 465 | |
| 466 | return 0; |
| 467 | |
| 468 | err_ret_free: |
| 469 | kfree(phy_dev_entry); |
| 470 | err_ret_unlock: |
| 471 | mutex_unlock(&phy_dev_list_mutex); |
| 472 | |
| 473 | err_ret: |
| 474 | return err; |
| 475 | } |
| 476 | |
| 477 | static int pkg_temp_thermal_device_remove(unsigned int cpu) |
| 478 | { |
| 479 | struct phy_dev_entry *n; |
| 480 | u16 phys_proc_id = topology_physical_package_id(cpu); |
| 481 | struct phy_dev_entry *phdev = |
| 482 | pkg_temp_thermal_get_phy_entry(cpu); |
| 483 | |
| 484 | if (!phdev) |
| 485 | return -ENODEV; |
| 486 | |
| 487 | mutex_lock(&phy_dev_list_mutex); |
| 488 | /* If we are loosing the first cpu for this package, we need change */ |
| 489 | if (phdev->first_cpu == cpu) { |
| 490 | phdev->first_cpu = find_siblings_cpu(cpu); |
| 491 | pr_debug("thermal_device_remove: first cpu switched %d\n", |
| 492 | phdev->first_cpu); |
| 493 | } |
| 494 | /* |
| 495 | * It is possible that no siblings left as this was the last cpu |
| 496 | * going offline. We don't need to worry about this assignment |
| 497 | * as the phydev entry will be removed in this case and |
| 498 | * thermal zone is removed. |
| 499 | */ |
| 500 | --phdev->ref_cnt; |
| 501 | pr_debug("thermal_device_remove: pkg: %d cpu %d ref_cnt %d\n", |
| 502 | phys_proc_id, cpu, phdev->ref_cnt); |
| 503 | if (!phdev->ref_cnt) |
| 504 | list_for_each_entry_safe(phdev, n, &phy_dev_list, list) { |
| 505 | if (phdev->phys_proc_id == phys_proc_id) { |
| 506 | thermal_zone_device_unregister(phdev->tzone); |
| 507 | list_del(&phdev->list); |
| 508 | kfree(phdev); |
| 509 | break; |
| 510 | } |
| 511 | } |
| 512 | mutex_unlock(&phy_dev_list_mutex); |
| 513 | |
| 514 | return 0; |
| 515 | } |
| 516 | |
| 517 | static int get_core_online(unsigned int cpu) |
| 518 | { |
| 519 | struct cpuinfo_x86 *c = &cpu_data(cpu); |
| 520 | struct phy_dev_entry *phdev = pkg_temp_thermal_get_phy_entry(cpu); |
| 521 | |
| 522 | /* Check if there is already an instance for this package */ |
| 523 | if (!phdev) { |
Srinivas Pandruvada | f3ed0a1 | 2013-07-11 09:50:30 -0700 | [diff] [blame] | 524 | if (!cpu_has(c, X86_FEATURE_DTHERM) || |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 525 | !cpu_has(c, X86_FEATURE_PTS)) |
| 526 | return -ENODEV; |
| 527 | if (pkg_temp_thermal_device_add(cpu)) |
| 528 | return -ENODEV; |
| 529 | } else { |
| 530 | mutex_lock(&phy_dev_list_mutex); |
| 531 | ++phdev->ref_cnt; |
| 532 | pr_debug("get_core_online: cpu %d ref_cnt %d\n", |
| 533 | cpu, phdev->ref_cnt); |
| 534 | mutex_unlock(&phy_dev_list_mutex); |
| 535 | } |
| 536 | INIT_DELAYED_WORK(&per_cpu(pkg_temp_thermal_threshold_work, cpu), |
| 537 | pkg_temp_thermal_threshold_work_fn); |
| 538 | |
| 539 | pr_debug("get_core_online: cpu %d successful\n", cpu); |
| 540 | |
| 541 | return 0; |
| 542 | } |
| 543 | |
| 544 | static void put_core_offline(unsigned int cpu) |
| 545 | { |
| 546 | if (!pkg_temp_thermal_device_remove(cpu)) |
| 547 | cancel_delayed_work_sync( |
| 548 | &per_cpu(pkg_temp_thermal_threshold_work, cpu)); |
| 549 | |
| 550 | pr_debug("put_core_offline: cpu %d\n", cpu); |
| 551 | } |
| 552 | |
| 553 | static int pkg_temp_thermal_cpu_callback(struct notifier_block *nfb, |
| 554 | unsigned long action, void *hcpu) |
| 555 | { |
| 556 | unsigned int cpu = (unsigned long) hcpu; |
| 557 | |
| 558 | switch (action) { |
| 559 | case CPU_ONLINE: |
| 560 | case CPU_DOWN_FAILED: |
| 561 | get_core_online(cpu); |
| 562 | break; |
| 563 | case CPU_DOWN_PREPARE: |
| 564 | put_core_offline(cpu); |
| 565 | break; |
| 566 | } |
| 567 | return NOTIFY_OK; |
| 568 | } |
| 569 | |
| 570 | static struct notifier_block pkg_temp_thermal_notifier __refdata = { |
| 571 | .notifier_call = pkg_temp_thermal_cpu_callback, |
| 572 | }; |
| 573 | |
| 574 | static const struct x86_cpu_id __initconst pkg_temp_thermal_ids[] = { |
Srinivas Pandruvada | f3ed0a1 | 2013-07-11 09:50:30 -0700 | [diff] [blame] | 575 | { X86_VENDOR_INTEL, X86_FAMILY_ANY, X86_MODEL_ANY, X86_FEATURE_PTS }, |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 576 | {} |
| 577 | }; |
| 578 | MODULE_DEVICE_TABLE(x86cpu, pkg_temp_thermal_ids); |
| 579 | |
| 580 | static int __init pkg_temp_thermal_init(void) |
| 581 | { |
| 582 | int i; |
| 583 | |
| 584 | if (!x86_match_cpu(pkg_temp_thermal_ids)) |
| 585 | return -ENODEV; |
| 586 | |
| 587 | spin_lock_init(&pkg_work_lock); |
| 588 | platform_thermal_package_notify = |
| 589 | pkg_temp_thermal_platform_thermal_notify; |
| 590 | platform_thermal_package_rate_control = |
| 591 | pkg_temp_thermal_platform_thermal_rate_control; |
| 592 | |
Srivatsa S. Bhat | cf0485a | 2014-03-11 02:10:54 +0530 | [diff] [blame] | 593 | cpu_notifier_register_begin(); |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 594 | for_each_online_cpu(i) |
| 595 | if (get_core_online(i)) |
| 596 | goto err_ret; |
Srivatsa S. Bhat | cf0485a | 2014-03-11 02:10:54 +0530 | [diff] [blame] | 597 | __register_hotcpu_notifier(&pkg_temp_thermal_notifier); |
| 598 | cpu_notifier_register_done(); |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 599 | |
| 600 | pkg_temp_debugfs_init(); /* Don't care if fails */ |
| 601 | |
| 602 | return 0; |
| 603 | |
| 604 | err_ret: |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 605 | for_each_online_cpu(i) |
| 606 | put_core_offline(i); |
Srivatsa S. Bhat | cf0485a | 2014-03-11 02:10:54 +0530 | [diff] [blame] | 607 | cpu_notifier_register_done(); |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 608 | kfree(pkg_work_scheduled); |
| 609 | platform_thermal_package_notify = NULL; |
| 610 | platform_thermal_package_rate_control = NULL; |
| 611 | |
| 612 | return -ENODEV; |
| 613 | } |
| 614 | |
| 615 | static void __exit pkg_temp_thermal_exit(void) |
| 616 | { |
| 617 | struct phy_dev_entry *phdev, *n; |
| 618 | int i; |
| 619 | |
Srivatsa S. Bhat | cf0485a | 2014-03-11 02:10:54 +0530 | [diff] [blame] | 620 | cpu_notifier_register_begin(); |
| 621 | __unregister_hotcpu_notifier(&pkg_temp_thermal_notifier); |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 622 | mutex_lock(&phy_dev_list_mutex); |
| 623 | list_for_each_entry_safe(phdev, n, &phy_dev_list, list) { |
| 624 | /* Retore old MSR value for package thermal interrupt */ |
| 625 | wrmsr_on_cpu(phdev->first_cpu, |
| 626 | MSR_IA32_PACKAGE_THERM_INTERRUPT, |
| 627 | phdev->start_pkg_therm_low, |
| 628 | phdev->start_pkg_therm_high); |
| 629 | thermal_zone_device_unregister(phdev->tzone); |
| 630 | list_del(&phdev->list); |
| 631 | kfree(phdev); |
| 632 | } |
| 633 | mutex_unlock(&phy_dev_list_mutex); |
| 634 | platform_thermal_package_notify = NULL; |
| 635 | platform_thermal_package_rate_control = NULL; |
| 636 | for_each_online_cpu(i) |
| 637 | cancel_delayed_work_sync( |
| 638 | &per_cpu(pkg_temp_thermal_threshold_work, i)); |
Srivatsa S. Bhat | cf0485a | 2014-03-11 02:10:54 +0530 | [diff] [blame] | 639 | cpu_notifier_register_done(); |
Srinivas Pandruvada | f1a18a1 | 2013-05-17 23:42:02 +0000 | [diff] [blame] | 640 | |
| 641 | kfree(pkg_work_scheduled); |
| 642 | |
| 643 | debugfs_remove_recursive(debugfs); |
| 644 | } |
| 645 | |
| 646 | module_init(pkg_temp_thermal_init) |
| 647 | module_exit(pkg_temp_thermal_exit) |
| 648 | |
| 649 | MODULE_DESCRIPTION("X86 PKG TEMP Thermal Driver"); |
| 650 | MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); |
| 651 | MODULE_LICENSE("GPL v2"); |