Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2009-2010 Intel Corporation |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms and conditions of the GNU General Public License, |
| 6 | * version 2, as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | * |
| 17 | * The full GNU General Public License is included in this distribution in |
| 18 | * the file called "COPYING". |
| 19 | * |
| 20 | * Authors: |
| 21 | * Jesse Barnes <jbarnes@virtuousgeek.org> |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * Some Intel Ibex Peak based platforms support so-called "intelligent |
| 26 | * power sharing", which allows the CPU and GPU to cooperate to maximize |
| 27 | * performance within a given TDP (thermal design point). This driver |
| 28 | * performs the coordination between the CPU and GPU, monitors thermal and |
| 29 | * power statistics in the platform, and initializes power monitoring |
| 30 | * hardware. It also provides a few tunables to control behavior. Its |
| 31 | * primary purpose is to safely allow CPU and GPU turbo modes to be enabled |
| 32 | * by tracking power and thermal budget; secondarily it can boost turbo |
| 33 | * performance by allocating more power or thermal budget to the CPU or GPU |
| 34 | * based on available headroom and activity. |
| 35 | * |
| 36 | * The basic algorithm is driven by a 5s moving average of tempurature. If |
| 37 | * thermal headroom is available, the CPU and/or GPU power clamps may be |
| 38 | * adjusted upwards. If we hit the thermal ceiling or a thermal trigger, |
| 39 | * we scale back the clamp. Aside from trigger events (when we're critically |
| 40 | * close or over our TDP) we don't adjust the clamps more than once every |
| 41 | * five seconds. |
| 42 | * |
| 43 | * The thermal device (device 31, function 6) has a set of registers that |
| 44 | * are updated by the ME firmware. The ME should also take the clamp values |
| 45 | * written to those registers and write them to the CPU, but we currently |
| 46 | * bypass that functionality and write the CPU MSR directly. |
| 47 | * |
| 48 | * UNSUPPORTED: |
| 49 | * - dual MCP configs |
| 50 | * |
| 51 | * TODO: |
| 52 | * - handle CPU hotplug |
| 53 | * - provide turbo enable/disable api |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 54 | * |
| 55 | * Related documents: |
| 56 | * - CDI 403777, 403778 - Auburndale EDS vol 1 & 2 |
| 57 | * - CDI 401376 - Ibex Peak EDS |
| 58 | * - ref 26037, 26641 - IPS BIOS spec |
| 59 | * - ref 26489 - Nehalem BIOS writer's guide |
| 60 | * - ref 26921 - Ibex Peak BIOS Specification |
| 61 | */ |
| 62 | |
| 63 | #include <linux/debugfs.h> |
| 64 | #include <linux/delay.h> |
| 65 | #include <linux/interrupt.h> |
| 66 | #include <linux/kernel.h> |
| 67 | #include <linux/kthread.h> |
| 68 | #include <linux/module.h> |
| 69 | #include <linux/pci.h> |
| 70 | #include <linux/sched.h> |
| 71 | #include <linux/seq_file.h> |
| 72 | #include <linux/string.h> |
| 73 | #include <linux/tick.h> |
| 74 | #include <linux/timer.h> |
| 75 | #include <drm/i915_drm.h> |
| 76 | #include <asm/msr.h> |
| 77 | #include <asm/processor.h> |
Eric Anholt | 63ee41d | 2010-12-20 18:40:06 -0800 | [diff] [blame] | 78 | #include "intel_ips.h" |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 79 | |
| 80 | #define PCI_DEVICE_ID_INTEL_THERMAL_SENSOR 0x3b32 |
| 81 | |
| 82 | /* |
| 83 | * Package level MSRs for monitor/control |
| 84 | */ |
| 85 | #define PLATFORM_INFO 0xce |
| 86 | #define PLATFORM_TDP (1<<29) |
| 87 | #define PLATFORM_RATIO (1<<28) |
| 88 | |
| 89 | #define IA32_MISC_ENABLE 0x1a0 |
| 90 | #define IA32_MISC_TURBO_EN (1ULL<<38) |
| 91 | |
| 92 | #define TURBO_POWER_CURRENT_LIMIT 0x1ac |
| 93 | #define TURBO_TDC_OVR_EN (1UL<<31) |
| 94 | #define TURBO_TDC_MASK (0x000000007fff0000UL) |
| 95 | #define TURBO_TDC_SHIFT (16) |
| 96 | #define TURBO_TDP_OVR_EN (1UL<<15) |
| 97 | #define TURBO_TDP_MASK (0x0000000000003fffUL) |
| 98 | |
| 99 | /* |
| 100 | * Core/thread MSRs for monitoring |
| 101 | */ |
| 102 | #define IA32_PERF_CTL 0x199 |
| 103 | #define IA32_PERF_TURBO_DIS (1ULL<<32) |
| 104 | |
| 105 | /* |
| 106 | * Thermal PCI device regs |
| 107 | */ |
| 108 | #define THM_CFG_TBAR 0x10 |
| 109 | #define THM_CFG_TBAR_HI 0x14 |
| 110 | |
| 111 | #define THM_TSIU 0x00 |
| 112 | #define THM_TSE 0x01 |
| 113 | #define TSE_EN 0xb8 |
| 114 | #define THM_TSS 0x02 |
| 115 | #define THM_TSTR 0x03 |
| 116 | #define THM_TSTTP 0x04 |
| 117 | #define THM_TSCO 0x08 |
| 118 | #define THM_TSES 0x0c |
| 119 | #define THM_TSGPEN 0x0d |
| 120 | #define TSGPEN_HOT_LOHI (1<<1) |
| 121 | #define TSGPEN_CRIT_LOHI (1<<2) |
| 122 | #define THM_TSPC 0x0e |
| 123 | #define THM_PPEC 0x10 |
| 124 | #define THM_CTA 0x12 |
| 125 | #define THM_PTA 0x14 |
| 126 | #define PTA_SLOPE_MASK (0xff00) |
| 127 | #define PTA_SLOPE_SHIFT 8 |
| 128 | #define PTA_OFFSET_MASK (0x00ff) |
| 129 | #define THM_MGTA 0x16 |
| 130 | #define MGTA_SLOPE_MASK (0xff00) |
| 131 | #define MGTA_SLOPE_SHIFT 8 |
| 132 | #define MGTA_OFFSET_MASK (0x00ff) |
| 133 | #define THM_TRC 0x1a |
| 134 | #define TRC_CORE2_EN (1<<15) |
| 135 | #define TRC_THM_EN (1<<12) |
| 136 | #define TRC_C6_WAR (1<<8) |
| 137 | #define TRC_CORE1_EN (1<<7) |
| 138 | #define TRC_CORE_PWR (1<<6) |
| 139 | #define TRC_PCH_EN (1<<5) |
| 140 | #define TRC_MCH_EN (1<<4) |
| 141 | #define TRC_DIMM4 (1<<3) |
| 142 | #define TRC_DIMM3 (1<<2) |
| 143 | #define TRC_DIMM2 (1<<1) |
| 144 | #define TRC_DIMM1 (1<<0) |
| 145 | #define THM_TES 0x20 |
| 146 | #define THM_TEN 0x21 |
| 147 | #define TEN_UPDATE_EN 1 |
| 148 | #define THM_PSC 0x24 |
| 149 | #define PSC_NTG (1<<0) /* No GFX turbo support */ |
| 150 | #define PSC_NTPC (1<<1) /* No CPU turbo support */ |
| 151 | #define PSC_PP_DEF (0<<2) /* Perf policy up to driver */ |
| 152 | #define PSP_PP_PC (1<<2) /* BIOS prefers CPU perf */ |
| 153 | #define PSP_PP_BAL (2<<2) /* BIOS wants balanced perf */ |
| 154 | #define PSP_PP_GFX (3<<2) /* BIOS prefers GFX perf */ |
| 155 | #define PSP_PBRT (1<<4) /* BIOS run time support */ |
| 156 | #define THM_CTV1 0x30 |
| 157 | #define CTV_TEMP_ERROR (1<<15) |
| 158 | #define CTV_TEMP_MASK 0x3f |
| 159 | #define CTV_ |
| 160 | #define THM_CTV2 0x32 |
| 161 | #define THM_CEC 0x34 /* undocumented power accumulator in joules */ |
| 162 | #define THM_AE 0x3f |
| 163 | #define THM_HTS 0x50 /* 32 bits */ |
| 164 | #define HTS_PCPL_MASK (0x7fe00000) |
| 165 | #define HTS_PCPL_SHIFT 21 |
| 166 | #define HTS_GPL_MASK (0x001ff000) |
| 167 | #define HTS_GPL_SHIFT 12 |
| 168 | #define HTS_PP_MASK (0x00000c00) |
| 169 | #define HTS_PP_SHIFT 10 |
| 170 | #define HTS_PP_DEF 0 |
| 171 | #define HTS_PP_PROC 1 |
| 172 | #define HTS_PP_BAL 2 |
| 173 | #define HTS_PP_GFX 3 |
| 174 | #define HTS_PCTD_DIS (1<<9) |
| 175 | #define HTS_GTD_DIS (1<<8) |
| 176 | #define HTS_PTL_MASK (0x000000fe) |
| 177 | #define HTS_PTL_SHIFT 1 |
| 178 | #define HTS_NVV (1<<0) |
| 179 | #define THM_HTSHI 0x54 /* 16 bits */ |
| 180 | #define HTS2_PPL_MASK (0x03ff) |
| 181 | #define HTS2_PRST_MASK (0x3c00) |
| 182 | #define HTS2_PRST_SHIFT 10 |
| 183 | #define HTS2_PRST_UNLOADED 0 |
| 184 | #define HTS2_PRST_RUNNING 1 |
| 185 | #define HTS2_PRST_TDISOP 2 /* turbo disabled due to power */ |
| 186 | #define HTS2_PRST_TDISHT 3 /* turbo disabled due to high temp */ |
| 187 | #define HTS2_PRST_TDISUSR 4 /* user disabled turbo */ |
| 188 | #define HTS2_PRST_TDISPLAT 5 /* platform disabled turbo */ |
| 189 | #define HTS2_PRST_TDISPM 6 /* power management disabled turbo */ |
| 190 | #define HTS2_PRST_TDISERR 7 /* some kind of error disabled turbo */ |
| 191 | #define THM_PTL 0x56 |
| 192 | #define THM_MGTV 0x58 |
| 193 | #define TV_MASK 0x000000000000ff00 |
| 194 | #define TV_SHIFT 8 |
| 195 | #define THM_PTV 0x60 |
| 196 | #define PTV_MASK 0x00ff |
| 197 | #define THM_MMGPC 0x64 |
| 198 | #define THM_MPPC 0x66 |
| 199 | #define THM_MPCPC 0x68 |
| 200 | #define THM_TSPIEN 0x82 |
| 201 | #define TSPIEN_AUX_LOHI (1<<0) |
| 202 | #define TSPIEN_HOT_LOHI (1<<1) |
| 203 | #define TSPIEN_CRIT_LOHI (1<<2) |
| 204 | #define TSPIEN_AUX2_LOHI (1<<3) |
| 205 | #define THM_TSLOCK 0x83 |
| 206 | #define THM_ATR 0x84 |
| 207 | #define THM_TOF 0x87 |
| 208 | #define THM_STS 0x98 |
| 209 | #define STS_PCPL_MASK (0x7fe00000) |
| 210 | #define STS_PCPL_SHIFT 21 |
| 211 | #define STS_GPL_MASK (0x001ff000) |
| 212 | #define STS_GPL_SHIFT 12 |
| 213 | #define STS_PP_MASK (0x00000c00) |
| 214 | #define STS_PP_SHIFT 10 |
| 215 | #define STS_PP_DEF 0 |
| 216 | #define STS_PP_PROC 1 |
| 217 | #define STS_PP_BAL 2 |
| 218 | #define STS_PP_GFX 3 |
| 219 | #define STS_PCTD_DIS (1<<9) |
| 220 | #define STS_GTD_DIS (1<<8) |
| 221 | #define STS_PTL_MASK (0x000000fe) |
| 222 | #define STS_PTL_SHIFT 1 |
| 223 | #define STS_NVV (1<<0) |
| 224 | #define THM_SEC 0x9c |
| 225 | #define SEC_ACK (1<<0) |
| 226 | #define THM_TC3 0xa4 |
| 227 | #define THM_TC1 0xa8 |
| 228 | #define STS_PPL_MASK (0x0003ff00) |
| 229 | #define STS_PPL_SHIFT 16 |
| 230 | #define THM_TC2 0xac |
| 231 | #define THM_DTV 0xb0 |
| 232 | #define THM_ITV 0xd8 |
minskey guo | 6230d18 | 2010-09-17 14:02:37 +0800 | [diff] [blame] | 233 | #define ITV_ME_SEQNO_MASK 0x00ff0000 /* ME should update every ~200ms */ |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 234 | #define ITV_ME_SEQNO_SHIFT (16) |
| 235 | #define ITV_MCH_TEMP_MASK 0x0000ff00 |
| 236 | #define ITV_MCH_TEMP_SHIFT (8) |
| 237 | #define ITV_PCH_TEMP_MASK 0x000000ff |
| 238 | |
| 239 | #define thm_readb(off) readb(ips->regmap + (off)) |
| 240 | #define thm_readw(off) readw(ips->regmap + (off)) |
| 241 | #define thm_readl(off) readl(ips->regmap + (off)) |
| 242 | #define thm_readq(off) readq(ips->regmap + (off)) |
| 243 | |
| 244 | #define thm_writeb(off, val) writeb((val), ips->regmap + (off)) |
| 245 | #define thm_writew(off, val) writew((val), ips->regmap + (off)) |
| 246 | #define thm_writel(off, val) writel((val), ips->regmap + (off)) |
| 247 | |
| 248 | static const int IPS_ADJUST_PERIOD = 5000; /* ms */ |
Eric Anholt | 63ee41d | 2010-12-20 18:40:06 -0800 | [diff] [blame] | 249 | static bool late_i915_load = false; |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 250 | |
| 251 | /* For initial average collection */ |
| 252 | static const int IPS_SAMPLE_PERIOD = 200; /* ms */ |
| 253 | static const int IPS_SAMPLE_WINDOW = 5000; /* 5s moving window of samples */ |
| 254 | #define IPS_SAMPLE_COUNT (IPS_SAMPLE_WINDOW / IPS_SAMPLE_PERIOD) |
| 255 | |
| 256 | /* Per-SKU limits */ |
| 257 | struct ips_mcp_limits { |
| 258 | int cpu_family; |
| 259 | int cpu_model; /* includes extended model... */ |
| 260 | int mcp_power_limit; /* mW units */ |
| 261 | int core_power_limit; |
| 262 | int mch_power_limit; |
| 263 | int core_temp_limit; /* degrees C */ |
| 264 | int mch_temp_limit; |
| 265 | }; |
| 266 | |
| 267 | /* Max temps are -10 degrees C to avoid PROCHOT# */ |
| 268 | |
| 269 | struct ips_mcp_limits ips_sv_limits = { |
| 270 | .mcp_power_limit = 35000, |
| 271 | .core_power_limit = 29000, |
| 272 | .mch_power_limit = 20000, |
| 273 | .core_temp_limit = 95, |
| 274 | .mch_temp_limit = 90 |
| 275 | }; |
| 276 | |
| 277 | struct ips_mcp_limits ips_lv_limits = { |
| 278 | .mcp_power_limit = 25000, |
| 279 | .core_power_limit = 21000, |
| 280 | .mch_power_limit = 13000, |
| 281 | .core_temp_limit = 95, |
| 282 | .mch_temp_limit = 90 |
| 283 | }; |
| 284 | |
| 285 | struct ips_mcp_limits ips_ulv_limits = { |
| 286 | .mcp_power_limit = 18000, |
| 287 | .core_power_limit = 14000, |
| 288 | .mch_power_limit = 11000, |
| 289 | .core_temp_limit = 95, |
| 290 | .mch_temp_limit = 90 |
| 291 | }; |
| 292 | |
| 293 | struct ips_driver { |
| 294 | struct pci_dev *dev; |
| 295 | void *regmap; |
| 296 | struct task_struct *monitor; |
| 297 | struct task_struct *adjust; |
| 298 | struct dentry *debug_root; |
| 299 | |
| 300 | /* Average CPU core temps (all averages in .01 degrees C for precision) */ |
| 301 | u16 ctv1_avg_temp; |
| 302 | u16 ctv2_avg_temp; |
| 303 | /* GMCH average */ |
| 304 | u16 mch_avg_temp; |
| 305 | /* Average for the CPU (both cores?) */ |
| 306 | u16 mcp_avg_temp; |
| 307 | /* Average power consumption (in mW) */ |
| 308 | u32 cpu_avg_power; |
| 309 | u32 mch_avg_power; |
| 310 | |
| 311 | /* Offset values */ |
| 312 | u16 cta_val; |
| 313 | u16 pta_val; |
| 314 | u16 mgta_val; |
| 315 | |
| 316 | /* Maximums & prefs, protected by turbo status lock */ |
| 317 | spinlock_t turbo_status_lock; |
| 318 | u16 mcp_temp_limit; |
| 319 | u16 mcp_power_limit; |
| 320 | u16 core_power_limit; |
| 321 | u16 mch_power_limit; |
| 322 | bool cpu_turbo_enabled; |
| 323 | bool __cpu_turbo_on; |
| 324 | bool gpu_turbo_enabled; |
| 325 | bool __gpu_turbo_on; |
| 326 | bool gpu_preferred; |
| 327 | bool poll_turbo_status; |
| 328 | bool second_cpu; |
Jesse Barnes | 354aeeb | 2010-09-23 23:49:28 +0200 | [diff] [blame] | 329 | bool turbo_toggle_allowed; |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 330 | struct ips_mcp_limits *limits; |
| 331 | |
| 332 | /* Optional MCH interfaces for if i915 is in use */ |
| 333 | unsigned long (*read_mch_val)(void); |
| 334 | bool (*gpu_raise)(void); |
| 335 | bool (*gpu_lower)(void); |
| 336 | bool (*gpu_busy)(void); |
| 337 | bool (*gpu_turbo_disable)(void); |
| 338 | |
| 339 | /* For restoration at unload */ |
| 340 | u64 orig_turbo_limit; |
| 341 | u64 orig_turbo_ratios; |
| 342 | }; |
| 343 | |
Eric Anholt | 63ee41d | 2010-12-20 18:40:06 -0800 | [diff] [blame] | 344 | static bool |
| 345 | ips_gpu_turbo_enabled(struct ips_driver *ips); |
| 346 | |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 347 | /** |
| 348 | * ips_cpu_busy - is CPU busy? |
| 349 | * @ips: IPS driver struct |
| 350 | * |
| 351 | * Check CPU for load to see whether we should increase its thermal budget. |
| 352 | * |
| 353 | * RETURNS: |
| 354 | * True if the CPU could use more power, false otherwise. |
| 355 | */ |
| 356 | static bool ips_cpu_busy(struct ips_driver *ips) |
| 357 | { |
| 358 | if ((avenrun[0] >> FSHIFT) > 1) |
| 359 | return true; |
| 360 | |
| 361 | return false; |
| 362 | } |
| 363 | |
| 364 | /** |
| 365 | * ips_cpu_raise - raise CPU power clamp |
| 366 | * @ips: IPS driver struct |
| 367 | * |
| 368 | * Raise the CPU power clamp by %IPS_CPU_STEP, in accordance with TDP for |
| 369 | * this platform. |
| 370 | * |
| 371 | * We do this by adjusting the TURBO_POWER_CURRENT_LIMIT MSR upwards (as |
| 372 | * long as we haven't hit the TDP limit for the SKU). |
| 373 | */ |
| 374 | static void ips_cpu_raise(struct ips_driver *ips) |
| 375 | { |
| 376 | u64 turbo_override; |
| 377 | u16 cur_tdp_limit, new_tdp_limit; |
| 378 | |
| 379 | if (!ips->cpu_turbo_enabled) |
| 380 | return; |
| 381 | |
| 382 | rdmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_override); |
| 383 | |
| 384 | cur_tdp_limit = turbo_override & TURBO_TDP_MASK; |
| 385 | new_tdp_limit = cur_tdp_limit + 8; /* 1W increase */ |
| 386 | |
| 387 | /* Clamp to SKU TDP limit */ |
| 388 | if (((new_tdp_limit * 10) / 8) > ips->core_power_limit) |
| 389 | new_tdp_limit = cur_tdp_limit; |
| 390 | |
| 391 | thm_writew(THM_MPCPC, (new_tdp_limit * 10) / 8); |
| 392 | |
| 393 | turbo_override |= TURBO_TDC_OVR_EN | TURBO_TDC_OVR_EN; |
| 394 | wrmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_override); |
| 395 | |
| 396 | turbo_override &= ~TURBO_TDP_MASK; |
| 397 | turbo_override |= new_tdp_limit; |
| 398 | |
| 399 | wrmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_override); |
| 400 | } |
| 401 | |
| 402 | /** |
| 403 | * ips_cpu_lower - lower CPU power clamp |
| 404 | * @ips: IPS driver struct |
| 405 | * |
| 406 | * Lower CPU power clamp b %IPS_CPU_STEP if possible. |
| 407 | * |
| 408 | * We do this by adjusting the TURBO_POWER_CURRENT_LIMIT MSR down, going |
| 409 | * as low as the platform limits will allow (though we could go lower there |
| 410 | * wouldn't be much point). |
| 411 | */ |
| 412 | static void ips_cpu_lower(struct ips_driver *ips) |
| 413 | { |
| 414 | u64 turbo_override; |
| 415 | u16 cur_limit, new_limit; |
| 416 | |
| 417 | rdmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_override); |
| 418 | |
| 419 | cur_limit = turbo_override & TURBO_TDP_MASK; |
| 420 | new_limit = cur_limit - 8; /* 1W decrease */ |
| 421 | |
| 422 | /* Clamp to SKU TDP limit */ |
Matthew Garrett | d24a9da | 2010-10-05 14:54:06 -0400 | [diff] [blame] | 423 | if (new_limit < (ips->orig_turbo_limit & TURBO_TDP_MASK)) |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 424 | new_limit = ips->orig_turbo_limit & TURBO_TDP_MASK; |
| 425 | |
| 426 | thm_writew(THM_MPCPC, (new_limit * 10) / 8); |
| 427 | |
| 428 | turbo_override |= TURBO_TDC_OVR_EN | TURBO_TDC_OVR_EN; |
| 429 | wrmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_override); |
| 430 | |
| 431 | turbo_override &= ~TURBO_TDP_MASK; |
| 432 | turbo_override |= new_limit; |
| 433 | |
| 434 | wrmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_override); |
| 435 | } |
| 436 | |
| 437 | /** |
| 438 | * do_enable_cpu_turbo - internal turbo enable function |
| 439 | * @data: unused |
| 440 | * |
| 441 | * Internal function for actually updating MSRs. When we enable/disable |
| 442 | * turbo, we need to do it on each CPU; this function is the one called |
| 443 | * by on_each_cpu() when needed. |
| 444 | */ |
| 445 | static void do_enable_cpu_turbo(void *data) |
| 446 | { |
| 447 | u64 perf_ctl; |
| 448 | |
| 449 | rdmsrl(IA32_PERF_CTL, perf_ctl); |
| 450 | if (perf_ctl & IA32_PERF_TURBO_DIS) { |
| 451 | perf_ctl &= ~IA32_PERF_TURBO_DIS; |
| 452 | wrmsrl(IA32_PERF_CTL, perf_ctl); |
| 453 | } |
| 454 | } |
| 455 | |
| 456 | /** |
| 457 | * ips_enable_cpu_turbo - enable turbo mode on all CPUs |
| 458 | * @ips: IPS driver struct |
| 459 | * |
| 460 | * Enable turbo mode by clearing the disable bit in IA32_PERF_CTL on |
| 461 | * all logical threads. |
| 462 | */ |
| 463 | static void ips_enable_cpu_turbo(struct ips_driver *ips) |
| 464 | { |
| 465 | /* Already on, no need to mess with MSRs */ |
| 466 | if (ips->__cpu_turbo_on) |
| 467 | return; |
| 468 | |
Jesse Barnes | 354aeeb | 2010-09-23 23:49:28 +0200 | [diff] [blame] | 469 | if (ips->turbo_toggle_allowed) |
| 470 | on_each_cpu(do_enable_cpu_turbo, ips, 1); |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 471 | |
| 472 | ips->__cpu_turbo_on = true; |
| 473 | } |
| 474 | |
| 475 | /** |
| 476 | * do_disable_cpu_turbo - internal turbo disable function |
| 477 | * @data: unused |
| 478 | * |
| 479 | * Internal function for actually updating MSRs. When we enable/disable |
| 480 | * turbo, we need to do it on each CPU; this function is the one called |
| 481 | * by on_each_cpu() when needed. |
| 482 | */ |
| 483 | static void do_disable_cpu_turbo(void *data) |
| 484 | { |
| 485 | u64 perf_ctl; |
| 486 | |
| 487 | rdmsrl(IA32_PERF_CTL, perf_ctl); |
| 488 | if (!(perf_ctl & IA32_PERF_TURBO_DIS)) { |
| 489 | perf_ctl |= IA32_PERF_TURBO_DIS; |
| 490 | wrmsrl(IA32_PERF_CTL, perf_ctl); |
| 491 | } |
| 492 | } |
| 493 | |
| 494 | /** |
| 495 | * ips_disable_cpu_turbo - disable turbo mode on all CPUs |
| 496 | * @ips: IPS driver struct |
| 497 | * |
| 498 | * Disable turbo mode by setting the disable bit in IA32_PERF_CTL on |
| 499 | * all logical threads. |
| 500 | */ |
| 501 | static void ips_disable_cpu_turbo(struct ips_driver *ips) |
| 502 | { |
| 503 | /* Already off, leave it */ |
| 504 | if (!ips->__cpu_turbo_on) |
| 505 | return; |
| 506 | |
Jesse Barnes | 354aeeb | 2010-09-23 23:49:28 +0200 | [diff] [blame] | 507 | if (ips->turbo_toggle_allowed) |
| 508 | on_each_cpu(do_disable_cpu_turbo, ips, 1); |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 509 | |
| 510 | ips->__cpu_turbo_on = false; |
| 511 | } |
| 512 | |
| 513 | /** |
| 514 | * ips_gpu_busy - is GPU busy? |
| 515 | * @ips: IPS driver struct |
| 516 | * |
| 517 | * Check GPU for load to see whether we should increase its thermal budget. |
| 518 | * We need to call into the i915 driver in this case. |
| 519 | * |
| 520 | * RETURNS: |
| 521 | * True if the GPU could use more power, false otherwise. |
| 522 | */ |
| 523 | static bool ips_gpu_busy(struct ips_driver *ips) |
| 524 | { |
Eric Anholt | 63ee41d | 2010-12-20 18:40:06 -0800 | [diff] [blame] | 525 | if (!ips_gpu_turbo_enabled(ips)) |
Jesse Barnes | 0385e52 | 2010-05-20 14:27:23 -0700 | [diff] [blame] | 526 | return false; |
| 527 | |
| 528 | return ips->gpu_busy(); |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 529 | } |
| 530 | |
| 531 | /** |
| 532 | * ips_gpu_raise - raise GPU power clamp |
| 533 | * @ips: IPS driver struct |
| 534 | * |
| 535 | * Raise the GPU frequency/power if possible. We need to call into the |
| 536 | * i915 driver in this case. |
| 537 | */ |
| 538 | static void ips_gpu_raise(struct ips_driver *ips) |
| 539 | { |
Eric Anholt | 63ee41d | 2010-12-20 18:40:06 -0800 | [diff] [blame] | 540 | if (!ips_gpu_turbo_enabled(ips)) |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 541 | return; |
| 542 | |
| 543 | if (!ips->gpu_raise()) |
| 544 | ips->gpu_turbo_enabled = false; |
| 545 | |
| 546 | return; |
| 547 | } |
| 548 | |
| 549 | /** |
| 550 | * ips_gpu_lower - lower GPU power clamp |
| 551 | * @ips: IPS driver struct |
| 552 | * |
| 553 | * Lower GPU frequency/power if possible. Need to call i915. |
| 554 | */ |
| 555 | static void ips_gpu_lower(struct ips_driver *ips) |
| 556 | { |
Eric Anholt | 63ee41d | 2010-12-20 18:40:06 -0800 | [diff] [blame] | 557 | if (!ips_gpu_turbo_enabled(ips)) |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 558 | return; |
| 559 | |
| 560 | if (!ips->gpu_lower()) |
| 561 | ips->gpu_turbo_enabled = false; |
| 562 | |
| 563 | return; |
| 564 | } |
| 565 | |
| 566 | /** |
| 567 | * ips_enable_gpu_turbo - notify the gfx driver turbo is available |
| 568 | * @ips: IPS driver struct |
| 569 | * |
| 570 | * Call into the graphics driver indicating that it can safely use |
| 571 | * turbo mode. |
| 572 | */ |
| 573 | static void ips_enable_gpu_turbo(struct ips_driver *ips) |
| 574 | { |
| 575 | if (ips->__gpu_turbo_on) |
| 576 | return; |
| 577 | ips->__gpu_turbo_on = true; |
| 578 | } |
| 579 | |
| 580 | /** |
| 581 | * ips_disable_gpu_turbo - notify the gfx driver to disable turbo mode |
| 582 | * @ips: IPS driver struct |
| 583 | * |
| 584 | * Request that the graphics driver disable turbo mode. |
| 585 | */ |
| 586 | static void ips_disable_gpu_turbo(struct ips_driver *ips) |
| 587 | { |
| 588 | /* Avoid calling i915 if turbo is already disabled */ |
| 589 | if (!ips->__gpu_turbo_on) |
| 590 | return; |
| 591 | |
| 592 | if (!ips->gpu_turbo_disable()) |
| 593 | dev_err(&ips->dev->dev, "failed to disable graphis turbo\n"); |
| 594 | else |
| 595 | ips->__gpu_turbo_on = false; |
| 596 | } |
| 597 | |
| 598 | /** |
| 599 | * mcp_exceeded - check whether we're outside our thermal & power limits |
| 600 | * @ips: IPS driver struct |
| 601 | * |
| 602 | * Check whether the MCP is over its thermal or power budget. |
| 603 | */ |
| 604 | static bool mcp_exceeded(struct ips_driver *ips) |
| 605 | { |
| 606 | unsigned long flags; |
| 607 | bool ret = false; |
Tim Gardner | a8c096a | 2010-09-28 14:58:15 -0600 | [diff] [blame] | 608 | u32 temp_limit; |
| 609 | u32 avg_power; |
| 610 | const char *msg = "MCP limit exceeded: "; |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 611 | |
| 612 | spin_lock_irqsave(&ips->turbo_status_lock, flags); |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 613 | |
Tim Gardner | a8c096a | 2010-09-28 14:58:15 -0600 | [diff] [blame] | 614 | temp_limit = ips->mcp_temp_limit * 100; |
| 615 | if (ips->mcp_avg_temp > temp_limit) { |
Jesse Barnes | 1a14703 | 2010-07-28 14:42:56 -0700 | [diff] [blame] | 616 | dev_info(&ips->dev->dev, |
Tim Gardner | a8c096a | 2010-09-28 14:58:15 -0600 | [diff] [blame] | 617 | "%sAvg temp %u, limit %u\n", msg, ips->mcp_avg_temp, |
| 618 | temp_limit); |
| 619 | ret = true; |
| 620 | } |
| 621 | |
| 622 | avg_power = ips->cpu_avg_power + ips->mch_avg_power; |
| 623 | if (avg_power > ips->mcp_power_limit) { |
| 624 | dev_info(&ips->dev->dev, |
| 625 | "%sAvg power %u, limit %u\n", msg, avg_power, |
| 626 | ips->mcp_power_limit); |
| 627 | ret = true; |
| 628 | } |
| 629 | |
| 630 | spin_unlock_irqrestore(&ips->turbo_status_lock, flags); |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 631 | |
| 632 | return ret; |
| 633 | } |
| 634 | |
| 635 | /** |
| 636 | * cpu_exceeded - check whether a CPU core is outside its limits |
| 637 | * @ips: IPS driver struct |
| 638 | * @cpu: CPU number to check |
| 639 | * |
| 640 | * Check a given CPU's average temp or power is over its limit. |
| 641 | */ |
| 642 | static bool cpu_exceeded(struct ips_driver *ips, int cpu) |
| 643 | { |
| 644 | unsigned long flags; |
| 645 | int avg; |
| 646 | bool ret = false; |
| 647 | |
| 648 | spin_lock_irqsave(&ips->turbo_status_lock, flags); |
| 649 | avg = cpu ? ips->ctv2_avg_temp : ips->ctv1_avg_temp; |
| 650 | if (avg > (ips->limits->core_temp_limit * 100)) |
| 651 | ret = true; |
Jesse Barnes | 0385e52 | 2010-05-20 14:27:23 -0700 | [diff] [blame] | 652 | if (ips->cpu_avg_power > ips->core_power_limit * 100) |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 653 | ret = true; |
| 654 | spin_unlock_irqrestore(&ips->turbo_status_lock, flags); |
| 655 | |
| 656 | if (ret) |
Jesse Barnes | 1a14703 | 2010-07-28 14:42:56 -0700 | [diff] [blame] | 657 | dev_info(&ips->dev->dev, |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 658 | "CPU power or thermal limit exceeded\n"); |
| 659 | |
| 660 | return ret; |
| 661 | } |
| 662 | |
| 663 | /** |
| 664 | * mch_exceeded - check whether the GPU is over budget |
| 665 | * @ips: IPS driver struct |
| 666 | * |
| 667 | * Check the MCH temp & power against their maximums. |
| 668 | */ |
| 669 | static bool mch_exceeded(struct ips_driver *ips) |
| 670 | { |
| 671 | unsigned long flags; |
| 672 | bool ret = false; |
| 673 | |
| 674 | spin_lock_irqsave(&ips->turbo_status_lock, flags); |
| 675 | if (ips->mch_avg_temp > (ips->limits->mch_temp_limit * 100)) |
| 676 | ret = true; |
Jesse Barnes | 0385e52 | 2010-05-20 14:27:23 -0700 | [diff] [blame] | 677 | if (ips->mch_avg_power > ips->mch_power_limit) |
| 678 | ret = true; |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 679 | spin_unlock_irqrestore(&ips->turbo_status_lock, flags); |
| 680 | |
| 681 | return ret; |
| 682 | } |
| 683 | |
| 684 | /** |
Jesse Barnes | eceab27 | 2010-09-23 23:49:29 +0200 | [diff] [blame] | 685 | * verify_limits - verify BIOS provided limits |
| 686 | * @ips: IPS structure |
| 687 | * |
| 688 | * BIOS can optionally provide non-default limits for power and temp. Check |
| 689 | * them here and use the defaults if the BIOS values are not provided or |
| 690 | * are otherwise unusable. |
| 691 | */ |
| 692 | static void verify_limits(struct ips_driver *ips) |
| 693 | { |
| 694 | if (ips->mcp_power_limit < ips->limits->mcp_power_limit || |
| 695 | ips->mcp_power_limit > 35000) |
| 696 | ips->mcp_power_limit = ips->limits->mcp_power_limit; |
| 697 | |
| 698 | if (ips->mcp_temp_limit < ips->limits->core_temp_limit || |
| 699 | ips->mcp_temp_limit < ips->limits->mch_temp_limit || |
| 700 | ips->mcp_temp_limit > 150) |
| 701 | ips->mcp_temp_limit = min(ips->limits->core_temp_limit, |
| 702 | ips->limits->mch_temp_limit); |
| 703 | } |
| 704 | |
| 705 | /** |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 706 | * update_turbo_limits - get various limits & settings from regs |
| 707 | * @ips: IPS driver struct |
| 708 | * |
| 709 | * Update the IPS power & temp limits, along with turbo enable flags, |
| 710 | * based on latest register contents. |
| 711 | * |
| 712 | * Used at init time and for runtime BIOS support, which requires polling |
| 713 | * the regs for updates (as a result of AC->DC transition for example). |
| 714 | * |
| 715 | * LOCKING: |
| 716 | * Caller must hold turbo_status_lock (outside of init) |
| 717 | */ |
| 718 | static void update_turbo_limits(struct ips_driver *ips) |
| 719 | { |
| 720 | u32 hts = thm_readl(THM_HTS); |
| 721 | |
| 722 | ips->cpu_turbo_enabled = !(hts & HTS_PCTD_DIS); |
Jesse Barnes | 96f3823 | 2010-10-05 14:50:59 -0400 | [diff] [blame] | 723 | /* |
| 724 | * Disable turbo for now, until we can figure out why the power figures |
| 725 | * are wrong |
| 726 | */ |
| 727 | ips->cpu_turbo_enabled = false; |
| 728 | |
Andy Whitcroft | 070c0ee1 | 2010-10-05 09:48:42 +0100 | [diff] [blame] | 729 | if (ips->gpu_busy) |
| 730 | ips->gpu_turbo_enabled = !(hts & HTS_GTD_DIS); |
Jesse Barnes | 96f3823 | 2010-10-05 14:50:59 -0400 | [diff] [blame] | 731 | |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 732 | ips->core_power_limit = thm_readw(THM_MPCPC); |
| 733 | ips->mch_power_limit = thm_readw(THM_MMGPC); |
| 734 | ips->mcp_temp_limit = thm_readw(THM_PTL); |
| 735 | ips->mcp_power_limit = thm_readw(THM_MPPC); |
| 736 | |
Jesse Barnes | eceab27 | 2010-09-23 23:49:29 +0200 | [diff] [blame] | 737 | verify_limits(ips); |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 738 | /* Ignore BIOS CPU vs GPU pref */ |
| 739 | } |
| 740 | |
| 741 | /** |
| 742 | * ips_adjust - adjust power clamp based on thermal state |
| 743 | * @data: ips driver structure |
| 744 | * |
| 745 | * Wake up every 5s or so and check whether we should adjust the power clamp. |
| 746 | * Check CPU and GPU load to determine which needs adjustment. There are |
| 747 | * several things to consider here: |
| 748 | * - do we need to adjust up or down? |
| 749 | * - is CPU busy? |
| 750 | * - is GPU busy? |
| 751 | * - is CPU in turbo? |
| 752 | * - is GPU in turbo? |
| 753 | * - is CPU or GPU preferred? (CPU is default) |
| 754 | * |
| 755 | * So, given the above, we do the following: |
| 756 | * - up (TDP available) |
| 757 | * - CPU not busy, GPU not busy - nothing |
| 758 | * - CPU busy, GPU not busy - adjust CPU up |
| 759 | * - CPU not busy, GPU busy - adjust GPU up |
| 760 | * - CPU busy, GPU busy - adjust preferred unit up, taking headroom from |
| 761 | * non-preferred unit if necessary |
| 762 | * - down (at TDP limit) |
| 763 | * - adjust both CPU and GPU down if possible |
| 764 | * |
| 765 | cpu+ gpu+ cpu+gpu- cpu-gpu+ cpu-gpu- |
| 766 | cpu < gpu < cpu+gpu+ cpu+ gpu+ nothing |
| 767 | cpu < gpu >= cpu+gpu-(mcp<) cpu+gpu-(mcp<) gpu- gpu- |
| 768 | cpu >= gpu < cpu-gpu+(mcp<) cpu- cpu-gpu+(mcp<) cpu- |
| 769 | cpu >= gpu >= cpu-gpu- cpu-gpu- cpu-gpu- cpu-gpu- |
| 770 | * |
| 771 | */ |
| 772 | static int ips_adjust(void *data) |
| 773 | { |
| 774 | struct ips_driver *ips = data; |
| 775 | unsigned long flags; |
| 776 | |
| 777 | dev_dbg(&ips->dev->dev, "starting ips-adjust thread\n"); |
| 778 | |
| 779 | /* |
| 780 | * Adjust CPU and GPU clamps every 5s if needed. Doing it more |
| 781 | * often isn't recommended due to ME interaction. |
| 782 | */ |
| 783 | do { |
| 784 | bool cpu_busy = ips_cpu_busy(ips); |
| 785 | bool gpu_busy = ips_gpu_busy(ips); |
| 786 | |
| 787 | spin_lock_irqsave(&ips->turbo_status_lock, flags); |
| 788 | if (ips->poll_turbo_status) |
| 789 | update_turbo_limits(ips); |
| 790 | spin_unlock_irqrestore(&ips->turbo_status_lock, flags); |
| 791 | |
| 792 | /* Update turbo status if necessary */ |
| 793 | if (ips->cpu_turbo_enabled) |
| 794 | ips_enable_cpu_turbo(ips); |
| 795 | else |
| 796 | ips_disable_cpu_turbo(ips); |
| 797 | |
| 798 | if (ips->gpu_turbo_enabled) |
| 799 | ips_enable_gpu_turbo(ips); |
| 800 | else |
| 801 | ips_disable_gpu_turbo(ips); |
| 802 | |
| 803 | /* We're outside our comfort zone, crank them down */ |
Jesse Barnes | 0385e52 | 2010-05-20 14:27:23 -0700 | [diff] [blame] | 804 | if (mcp_exceeded(ips)) { |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 805 | ips_cpu_lower(ips); |
| 806 | ips_gpu_lower(ips); |
| 807 | goto sleep; |
| 808 | } |
| 809 | |
| 810 | if (!cpu_exceeded(ips, 0) && cpu_busy) |
| 811 | ips_cpu_raise(ips); |
| 812 | else |
| 813 | ips_cpu_lower(ips); |
| 814 | |
| 815 | if (!mch_exceeded(ips) && gpu_busy) |
| 816 | ips_gpu_raise(ips); |
| 817 | else |
| 818 | ips_gpu_lower(ips); |
| 819 | |
| 820 | sleep: |
| 821 | schedule_timeout_interruptible(msecs_to_jiffies(IPS_ADJUST_PERIOD)); |
| 822 | } while (!kthread_should_stop()); |
| 823 | |
| 824 | dev_dbg(&ips->dev->dev, "ips-adjust thread stopped\n"); |
| 825 | |
| 826 | return 0; |
| 827 | } |
| 828 | |
| 829 | /* |
| 830 | * Helpers for reading out temp/power values and calculating their |
| 831 | * averages for the decision making and monitoring functions. |
| 832 | */ |
| 833 | |
| 834 | static u16 calc_avg_temp(struct ips_driver *ips, u16 *array) |
| 835 | { |
| 836 | u64 total = 0; |
| 837 | int i; |
| 838 | u16 avg; |
| 839 | |
| 840 | for (i = 0; i < IPS_SAMPLE_COUNT; i++) |
| 841 | total += (u64)(array[i] * 100); |
| 842 | |
| 843 | do_div(total, IPS_SAMPLE_COUNT); |
| 844 | |
| 845 | avg = (u16)total; |
| 846 | |
| 847 | return avg; |
| 848 | } |
| 849 | |
| 850 | static u16 read_mgtv(struct ips_driver *ips) |
| 851 | { |
| 852 | u16 ret; |
| 853 | u64 slope, offset; |
| 854 | u64 val; |
| 855 | |
| 856 | val = thm_readq(THM_MGTV); |
| 857 | val = (val & TV_MASK) >> TV_SHIFT; |
| 858 | |
| 859 | slope = offset = thm_readw(THM_MGTA); |
| 860 | slope = (slope & MGTA_SLOPE_MASK) >> MGTA_SLOPE_SHIFT; |
| 861 | offset = offset & MGTA_OFFSET_MASK; |
| 862 | |
| 863 | ret = ((val * slope + 0x40) >> 7) + offset; |
| 864 | |
Jesse Barnes | 0385e52 | 2010-05-20 14:27:23 -0700 | [diff] [blame] | 865 | return 0; /* MCH temp reporting buggy */ |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 866 | } |
| 867 | |
| 868 | static u16 read_ptv(struct ips_driver *ips) |
| 869 | { |
| 870 | u16 val, slope, offset; |
| 871 | |
| 872 | slope = (ips->pta_val & PTA_SLOPE_MASK) >> PTA_SLOPE_SHIFT; |
| 873 | offset = ips->pta_val & PTA_OFFSET_MASK; |
| 874 | |
| 875 | val = thm_readw(THM_PTV) & PTV_MASK; |
| 876 | |
| 877 | return val; |
| 878 | } |
| 879 | |
| 880 | static u16 read_ctv(struct ips_driver *ips, int cpu) |
| 881 | { |
| 882 | int reg = cpu ? THM_CTV2 : THM_CTV1; |
| 883 | u16 val; |
| 884 | |
| 885 | val = thm_readw(reg); |
| 886 | if (!(val & CTV_TEMP_ERROR)) |
| 887 | val = (val) >> 6; /* discard fractional component */ |
| 888 | else |
| 889 | val = 0; |
| 890 | |
| 891 | return val; |
| 892 | } |
| 893 | |
| 894 | static u32 get_cpu_power(struct ips_driver *ips, u32 *last, int period) |
| 895 | { |
| 896 | u32 val; |
| 897 | u32 ret; |
| 898 | |
| 899 | /* |
| 900 | * CEC is in joules/65535. Take difference over time to |
| 901 | * get watts. |
| 902 | */ |
| 903 | val = thm_readl(THM_CEC); |
| 904 | |
| 905 | /* period is in ms and we want mW */ |
| 906 | ret = (((val - *last) * 1000) / period); |
| 907 | ret = (ret * 1000) / 65535; |
| 908 | *last = val; |
| 909 | |
Jesse Barnes | 96f3823 | 2010-10-05 14:50:59 -0400 | [diff] [blame] | 910 | return 0; |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 911 | } |
| 912 | |
| 913 | static const u16 temp_decay_factor = 2; |
| 914 | static u16 update_average_temp(u16 avg, u16 val) |
| 915 | { |
| 916 | u16 ret; |
| 917 | |
| 918 | /* Multiply by 100 for extra precision */ |
| 919 | ret = (val * 100 / temp_decay_factor) + |
| 920 | (((temp_decay_factor - 1) * avg) / temp_decay_factor); |
| 921 | return ret; |
| 922 | } |
| 923 | |
| 924 | static const u16 power_decay_factor = 2; |
| 925 | static u16 update_average_power(u32 avg, u32 val) |
| 926 | { |
| 927 | u32 ret; |
| 928 | |
| 929 | ret = (val / power_decay_factor) + |
| 930 | (((power_decay_factor - 1) * avg) / power_decay_factor); |
| 931 | |
| 932 | return ret; |
| 933 | } |
| 934 | |
| 935 | static u32 calc_avg_power(struct ips_driver *ips, u32 *array) |
| 936 | { |
| 937 | u64 total = 0; |
| 938 | u32 avg; |
| 939 | int i; |
| 940 | |
| 941 | for (i = 0; i < IPS_SAMPLE_COUNT; i++) |
| 942 | total += array[i]; |
| 943 | |
| 944 | do_div(total, IPS_SAMPLE_COUNT); |
| 945 | avg = (u32)total; |
| 946 | |
| 947 | return avg; |
| 948 | } |
| 949 | |
| 950 | static void monitor_timeout(unsigned long arg) |
| 951 | { |
| 952 | wake_up_process((struct task_struct *)arg); |
| 953 | } |
| 954 | |
| 955 | /** |
| 956 | * ips_monitor - temp/power monitoring thread |
| 957 | * @data: ips driver structure |
| 958 | * |
| 959 | * This is the main function for the IPS driver. It monitors power and |
| 960 | * tempurature in the MCP and adjusts CPU and GPU power clams accordingly. |
| 961 | * |
| 962 | * We keep a 5s moving average of power consumption and tempurature. Using |
| 963 | * that data, along with CPU vs GPU preference, we adjust the power clamps |
| 964 | * up or down. |
| 965 | */ |
| 966 | static int ips_monitor(void *data) |
| 967 | { |
| 968 | struct ips_driver *ips = data; |
| 969 | struct timer_list timer; |
| 970 | unsigned long seqno_timestamp, expire, last_msecs, last_sample_period; |
| 971 | int i; |
Jiri Slaby | e9ec7f3 | 2010-06-21 17:40:15 +0200 | [diff] [blame] | 972 | u32 *cpu_samples, *mchp_samples, old_cpu_power; |
| 973 | u16 *mcp_samples, *ctv1_samples, *ctv2_samples, *mch_samples; |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 974 | u8 cur_seqno, last_seqno; |
| 975 | |
| 976 | mcp_samples = kzalloc(sizeof(u16) * IPS_SAMPLE_COUNT, GFP_KERNEL); |
| 977 | ctv1_samples = kzalloc(sizeof(u16) * IPS_SAMPLE_COUNT, GFP_KERNEL); |
| 978 | ctv2_samples = kzalloc(sizeof(u16) * IPS_SAMPLE_COUNT, GFP_KERNEL); |
| 979 | mch_samples = kzalloc(sizeof(u16) * IPS_SAMPLE_COUNT, GFP_KERNEL); |
| 980 | cpu_samples = kzalloc(sizeof(u32) * IPS_SAMPLE_COUNT, GFP_KERNEL); |
| 981 | mchp_samples = kzalloc(sizeof(u32) * IPS_SAMPLE_COUNT, GFP_KERNEL); |
Jiri Slaby | e9ec7f3 | 2010-06-21 17:40:15 +0200 | [diff] [blame] | 982 | if (!mcp_samples || !ctv1_samples || !ctv2_samples || !mch_samples || |
| 983 | !cpu_samples || !mchp_samples) { |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 984 | dev_err(&ips->dev->dev, |
| 985 | "failed to allocate sample array, ips disabled\n"); |
| 986 | kfree(mcp_samples); |
| 987 | kfree(ctv1_samples); |
| 988 | kfree(ctv2_samples); |
| 989 | kfree(mch_samples); |
| 990 | kfree(cpu_samples); |
Jiri Slaby | e9ec7f3 | 2010-06-21 17:40:15 +0200 | [diff] [blame] | 991 | kfree(mchp_samples); |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 992 | return -ENOMEM; |
| 993 | } |
| 994 | |
| 995 | last_seqno = (thm_readl(THM_ITV) & ITV_ME_SEQNO_MASK) >> |
| 996 | ITV_ME_SEQNO_SHIFT; |
| 997 | seqno_timestamp = get_jiffies_64(); |
| 998 | |
minskey guo | c21eae4 | 2010-09-17 14:03:01 +0800 | [diff] [blame] | 999 | old_cpu_power = thm_readl(THM_CEC); |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 1000 | schedule_timeout_interruptible(msecs_to_jiffies(IPS_SAMPLE_PERIOD)); |
| 1001 | |
| 1002 | /* Collect an initial average */ |
| 1003 | for (i = 0; i < IPS_SAMPLE_COUNT; i++) { |
| 1004 | u32 mchp, cpu_power; |
| 1005 | u16 val; |
| 1006 | |
| 1007 | mcp_samples[i] = read_ptv(ips); |
| 1008 | |
| 1009 | val = read_ctv(ips, 0); |
| 1010 | ctv1_samples[i] = val; |
| 1011 | |
| 1012 | val = read_ctv(ips, 1); |
| 1013 | ctv2_samples[i] = val; |
| 1014 | |
| 1015 | val = read_mgtv(ips); |
| 1016 | mch_samples[i] = val; |
| 1017 | |
| 1018 | cpu_power = get_cpu_power(ips, &old_cpu_power, |
| 1019 | IPS_SAMPLE_PERIOD); |
| 1020 | cpu_samples[i] = cpu_power; |
| 1021 | |
| 1022 | if (ips->read_mch_val) { |
| 1023 | mchp = ips->read_mch_val(); |
| 1024 | mchp_samples[i] = mchp; |
| 1025 | } |
| 1026 | |
| 1027 | schedule_timeout_interruptible(msecs_to_jiffies(IPS_SAMPLE_PERIOD)); |
| 1028 | if (kthread_should_stop()) |
| 1029 | break; |
| 1030 | } |
| 1031 | |
| 1032 | ips->mcp_avg_temp = calc_avg_temp(ips, mcp_samples); |
| 1033 | ips->ctv1_avg_temp = calc_avg_temp(ips, ctv1_samples); |
| 1034 | ips->ctv2_avg_temp = calc_avg_temp(ips, ctv2_samples); |
| 1035 | ips->mch_avg_temp = calc_avg_temp(ips, mch_samples); |
| 1036 | ips->cpu_avg_power = calc_avg_power(ips, cpu_samples); |
| 1037 | ips->mch_avg_power = calc_avg_power(ips, mchp_samples); |
| 1038 | kfree(mcp_samples); |
| 1039 | kfree(ctv1_samples); |
| 1040 | kfree(ctv2_samples); |
| 1041 | kfree(mch_samples); |
| 1042 | kfree(cpu_samples); |
| 1043 | kfree(mchp_samples); |
| 1044 | |
| 1045 | /* Start the adjustment thread now that we have data */ |
| 1046 | wake_up_process(ips->adjust); |
| 1047 | |
| 1048 | /* |
| 1049 | * Ok, now we have an initial avg. From here on out, we track the |
| 1050 | * running avg using a decaying average calculation. This allows |
| 1051 | * us to reduce the sample frequency if the CPU and GPU are idle. |
| 1052 | */ |
| 1053 | old_cpu_power = thm_readl(THM_CEC); |
| 1054 | schedule_timeout_interruptible(msecs_to_jiffies(IPS_SAMPLE_PERIOD)); |
| 1055 | last_sample_period = IPS_SAMPLE_PERIOD; |
| 1056 | |
| 1057 | setup_deferrable_timer_on_stack(&timer, monitor_timeout, |
| 1058 | (unsigned long)current); |
| 1059 | do { |
| 1060 | u32 cpu_val, mch_val; |
| 1061 | u16 val; |
| 1062 | |
| 1063 | /* MCP itself */ |
| 1064 | val = read_ptv(ips); |
| 1065 | ips->mcp_avg_temp = update_average_temp(ips->mcp_avg_temp, val); |
| 1066 | |
| 1067 | /* Processor 0 */ |
| 1068 | val = read_ctv(ips, 0); |
| 1069 | ips->ctv1_avg_temp = |
| 1070 | update_average_temp(ips->ctv1_avg_temp, val); |
| 1071 | /* Power */ |
| 1072 | cpu_val = get_cpu_power(ips, &old_cpu_power, |
| 1073 | last_sample_period); |
| 1074 | ips->cpu_avg_power = |
| 1075 | update_average_power(ips->cpu_avg_power, cpu_val); |
| 1076 | |
| 1077 | if (ips->second_cpu) { |
| 1078 | /* Processor 1 */ |
| 1079 | val = read_ctv(ips, 1); |
| 1080 | ips->ctv2_avg_temp = |
| 1081 | update_average_temp(ips->ctv2_avg_temp, val); |
| 1082 | } |
| 1083 | |
| 1084 | /* MCH */ |
| 1085 | val = read_mgtv(ips); |
| 1086 | ips->mch_avg_temp = update_average_temp(ips->mch_avg_temp, val); |
| 1087 | /* Power */ |
| 1088 | if (ips->read_mch_val) { |
| 1089 | mch_val = ips->read_mch_val(); |
| 1090 | ips->mch_avg_power = |
| 1091 | update_average_power(ips->mch_avg_power, |
| 1092 | mch_val); |
| 1093 | } |
| 1094 | |
| 1095 | /* |
| 1096 | * Make sure ME is updating thermal regs. |
| 1097 | * Note: |
| 1098 | * If it's been more than a second since the last update, |
| 1099 | * the ME is probably hung. |
| 1100 | */ |
| 1101 | cur_seqno = (thm_readl(THM_ITV) & ITV_ME_SEQNO_MASK) >> |
| 1102 | ITV_ME_SEQNO_SHIFT; |
| 1103 | if (cur_seqno == last_seqno && |
| 1104 | time_after(jiffies, seqno_timestamp + HZ)) { |
| 1105 | dev_warn(&ips->dev->dev, "ME failed to update for more than 1s, likely hung\n"); |
| 1106 | } else { |
| 1107 | seqno_timestamp = get_jiffies_64(); |
| 1108 | last_seqno = cur_seqno; |
| 1109 | } |
| 1110 | |
| 1111 | last_msecs = jiffies_to_msecs(jiffies); |
| 1112 | expire = jiffies + msecs_to_jiffies(IPS_SAMPLE_PERIOD); |
| 1113 | |
Jesse Barnes | a342421 | 2011-03-28 06:36:30 -0400 | [diff] [blame^] | 1114 | __set_current_state(TASK_INTERRUPTIBLE); |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 1115 | mod_timer(&timer, expire); |
| 1116 | schedule(); |
| 1117 | |
| 1118 | /* Calculate actual sample period for power averaging */ |
| 1119 | last_sample_period = jiffies_to_msecs(jiffies) - last_msecs; |
| 1120 | if (!last_sample_period) |
| 1121 | last_sample_period = 1; |
| 1122 | } while (!kthread_should_stop()); |
| 1123 | |
| 1124 | del_timer_sync(&timer); |
| 1125 | destroy_timer_on_stack(&timer); |
| 1126 | |
| 1127 | dev_dbg(&ips->dev->dev, "ips-monitor thread stopped\n"); |
| 1128 | |
| 1129 | return 0; |
| 1130 | } |
| 1131 | |
| 1132 | #if 0 |
| 1133 | #define THM_DUMPW(reg) \ |
| 1134 | { \ |
| 1135 | u16 val = thm_readw(reg); \ |
| 1136 | dev_dbg(&ips->dev->dev, #reg ": 0x%04x\n", val); \ |
| 1137 | } |
| 1138 | #define THM_DUMPL(reg) \ |
| 1139 | { \ |
| 1140 | u32 val = thm_readl(reg); \ |
| 1141 | dev_dbg(&ips->dev->dev, #reg ": 0x%08x\n", val); \ |
| 1142 | } |
| 1143 | #define THM_DUMPQ(reg) \ |
| 1144 | { \ |
| 1145 | u64 val = thm_readq(reg); \ |
| 1146 | dev_dbg(&ips->dev->dev, #reg ": 0x%016x\n", val); \ |
| 1147 | } |
| 1148 | |
| 1149 | static void dump_thermal_info(struct ips_driver *ips) |
| 1150 | { |
| 1151 | u16 ptl; |
| 1152 | |
| 1153 | ptl = thm_readw(THM_PTL); |
| 1154 | dev_dbg(&ips->dev->dev, "Processor temp limit: %d\n", ptl); |
| 1155 | |
| 1156 | THM_DUMPW(THM_CTA); |
| 1157 | THM_DUMPW(THM_TRC); |
| 1158 | THM_DUMPW(THM_CTV1); |
| 1159 | THM_DUMPL(THM_STS); |
| 1160 | THM_DUMPW(THM_PTV); |
| 1161 | THM_DUMPQ(THM_MGTV); |
| 1162 | } |
| 1163 | #endif |
| 1164 | |
| 1165 | /** |
| 1166 | * ips_irq_handler - handle temperature triggers and other IPS events |
| 1167 | * @irq: irq number |
| 1168 | * @arg: unused |
| 1169 | * |
| 1170 | * Handle temperature limit trigger events, generally by lowering the clamps. |
| 1171 | * If we're at a critical limit, we clamp back to the lowest possible value |
| 1172 | * to prevent emergency shutdown. |
| 1173 | */ |
| 1174 | static irqreturn_t ips_irq_handler(int irq, void *arg) |
| 1175 | { |
| 1176 | struct ips_driver *ips = arg; |
| 1177 | u8 tses = thm_readb(THM_TSES); |
| 1178 | u8 tes = thm_readb(THM_TES); |
| 1179 | |
| 1180 | if (!tses && !tes) |
| 1181 | return IRQ_NONE; |
| 1182 | |
| 1183 | dev_info(&ips->dev->dev, "TSES: 0x%02x\n", tses); |
| 1184 | dev_info(&ips->dev->dev, "TES: 0x%02x\n", tes); |
| 1185 | |
| 1186 | /* STS update from EC? */ |
| 1187 | if (tes & 1) { |
| 1188 | u32 sts, tc1; |
| 1189 | |
| 1190 | sts = thm_readl(THM_STS); |
| 1191 | tc1 = thm_readl(THM_TC1); |
| 1192 | |
| 1193 | if (sts & STS_NVV) { |
| 1194 | spin_lock(&ips->turbo_status_lock); |
| 1195 | ips->core_power_limit = (sts & STS_PCPL_MASK) >> |
| 1196 | STS_PCPL_SHIFT; |
| 1197 | ips->mch_power_limit = (sts & STS_GPL_MASK) >> |
| 1198 | STS_GPL_SHIFT; |
| 1199 | /* ignore EC CPU vs GPU pref */ |
| 1200 | ips->cpu_turbo_enabled = !(sts & STS_PCTD_DIS); |
Jesse Barnes | 96f3823 | 2010-10-05 14:50:59 -0400 | [diff] [blame] | 1201 | /* |
| 1202 | * Disable turbo for now, until we can figure |
| 1203 | * out why the power figures are wrong |
| 1204 | */ |
| 1205 | ips->cpu_turbo_enabled = false; |
Andy Whitcroft | 070c0ee1 | 2010-10-05 09:48:42 +0100 | [diff] [blame] | 1206 | if (ips->gpu_busy) |
| 1207 | ips->gpu_turbo_enabled = !(sts & STS_GTD_DIS); |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 1208 | ips->mcp_temp_limit = (sts & STS_PTL_MASK) >> |
| 1209 | STS_PTL_SHIFT; |
| 1210 | ips->mcp_power_limit = (tc1 & STS_PPL_MASK) >> |
| 1211 | STS_PPL_SHIFT; |
Jesse Barnes | eceab27 | 2010-09-23 23:49:29 +0200 | [diff] [blame] | 1212 | verify_limits(ips); |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 1213 | spin_unlock(&ips->turbo_status_lock); |
| 1214 | |
| 1215 | thm_writeb(THM_SEC, SEC_ACK); |
| 1216 | } |
| 1217 | thm_writeb(THM_TES, tes); |
| 1218 | } |
| 1219 | |
| 1220 | /* Thermal trip */ |
| 1221 | if (tses) { |
| 1222 | dev_warn(&ips->dev->dev, |
| 1223 | "thermal trip occurred, tses: 0x%04x\n", tses); |
| 1224 | thm_writeb(THM_TSES, tses); |
| 1225 | } |
| 1226 | |
| 1227 | return IRQ_HANDLED; |
| 1228 | } |
| 1229 | |
| 1230 | #ifndef CONFIG_DEBUG_FS |
| 1231 | static void ips_debugfs_init(struct ips_driver *ips) { return; } |
| 1232 | static void ips_debugfs_cleanup(struct ips_driver *ips) { return; } |
| 1233 | #else |
| 1234 | |
| 1235 | /* Expose current state and limits in debugfs if possible */ |
| 1236 | |
| 1237 | struct ips_debugfs_node { |
| 1238 | struct ips_driver *ips; |
| 1239 | char *name; |
| 1240 | int (*show)(struct seq_file *m, void *data); |
| 1241 | }; |
| 1242 | |
| 1243 | static int show_cpu_temp(struct seq_file *m, void *data) |
| 1244 | { |
| 1245 | struct ips_driver *ips = m->private; |
| 1246 | |
| 1247 | seq_printf(m, "%d.%02d\n", ips->ctv1_avg_temp / 100, |
| 1248 | ips->ctv1_avg_temp % 100); |
| 1249 | |
| 1250 | return 0; |
| 1251 | } |
| 1252 | |
| 1253 | static int show_cpu_power(struct seq_file *m, void *data) |
| 1254 | { |
| 1255 | struct ips_driver *ips = m->private; |
| 1256 | |
| 1257 | seq_printf(m, "%dmW\n", ips->cpu_avg_power); |
| 1258 | |
| 1259 | return 0; |
| 1260 | } |
| 1261 | |
| 1262 | static int show_cpu_clamp(struct seq_file *m, void *data) |
| 1263 | { |
| 1264 | u64 turbo_override; |
| 1265 | int tdp, tdc; |
| 1266 | |
| 1267 | rdmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_override); |
| 1268 | |
| 1269 | tdp = (int)(turbo_override & TURBO_TDP_MASK); |
| 1270 | tdc = (int)((turbo_override & TURBO_TDC_MASK) >> TURBO_TDC_SHIFT); |
| 1271 | |
| 1272 | /* Convert to .1W/A units */ |
| 1273 | tdp = tdp * 10 / 8; |
| 1274 | tdc = tdc * 10 / 8; |
| 1275 | |
| 1276 | /* Watts Amperes */ |
| 1277 | seq_printf(m, "%d.%dW %d.%dA\n", tdp / 10, tdp % 10, |
| 1278 | tdc / 10, tdc % 10); |
| 1279 | |
| 1280 | return 0; |
| 1281 | } |
| 1282 | |
| 1283 | static int show_mch_temp(struct seq_file *m, void *data) |
| 1284 | { |
| 1285 | struct ips_driver *ips = m->private; |
| 1286 | |
| 1287 | seq_printf(m, "%d.%02d\n", ips->mch_avg_temp / 100, |
| 1288 | ips->mch_avg_temp % 100); |
| 1289 | |
| 1290 | return 0; |
| 1291 | } |
| 1292 | |
| 1293 | static int show_mch_power(struct seq_file *m, void *data) |
| 1294 | { |
| 1295 | struct ips_driver *ips = m->private; |
| 1296 | |
| 1297 | seq_printf(m, "%dmW\n", ips->mch_avg_power); |
| 1298 | |
| 1299 | return 0; |
| 1300 | } |
| 1301 | |
| 1302 | static struct ips_debugfs_node ips_debug_files[] = { |
| 1303 | { NULL, "cpu_temp", show_cpu_temp }, |
| 1304 | { NULL, "cpu_power", show_cpu_power }, |
| 1305 | { NULL, "cpu_clamp", show_cpu_clamp }, |
| 1306 | { NULL, "mch_temp", show_mch_temp }, |
| 1307 | { NULL, "mch_power", show_mch_power }, |
| 1308 | }; |
| 1309 | |
| 1310 | static int ips_debugfs_open(struct inode *inode, struct file *file) |
| 1311 | { |
| 1312 | struct ips_debugfs_node *node = inode->i_private; |
| 1313 | |
| 1314 | return single_open(file, node->show, node->ips); |
| 1315 | } |
| 1316 | |
| 1317 | static const struct file_operations ips_debugfs_ops = { |
| 1318 | .owner = THIS_MODULE, |
| 1319 | .open = ips_debugfs_open, |
| 1320 | .read = seq_read, |
| 1321 | .llseek = seq_lseek, |
| 1322 | .release = single_release, |
| 1323 | }; |
| 1324 | |
| 1325 | static void ips_debugfs_cleanup(struct ips_driver *ips) |
| 1326 | { |
| 1327 | if (ips->debug_root) |
| 1328 | debugfs_remove_recursive(ips->debug_root); |
| 1329 | return; |
| 1330 | } |
| 1331 | |
| 1332 | static void ips_debugfs_init(struct ips_driver *ips) |
| 1333 | { |
| 1334 | int i; |
| 1335 | |
| 1336 | ips->debug_root = debugfs_create_dir("ips", NULL); |
| 1337 | if (!ips->debug_root) { |
| 1338 | dev_err(&ips->dev->dev, |
| 1339 | "failed to create debugfs entries: %ld\n", |
| 1340 | PTR_ERR(ips->debug_root)); |
| 1341 | return; |
| 1342 | } |
| 1343 | |
| 1344 | for (i = 0; i < ARRAY_SIZE(ips_debug_files); i++) { |
| 1345 | struct dentry *ent; |
| 1346 | struct ips_debugfs_node *node = &ips_debug_files[i]; |
| 1347 | |
| 1348 | node->ips = ips; |
| 1349 | ent = debugfs_create_file(node->name, S_IFREG | S_IRUGO, |
| 1350 | ips->debug_root, node, |
| 1351 | &ips_debugfs_ops); |
| 1352 | if (!ent) { |
| 1353 | dev_err(&ips->dev->dev, |
| 1354 | "failed to create debug file: %ld\n", |
| 1355 | PTR_ERR(ent)); |
| 1356 | goto err_cleanup; |
| 1357 | } |
| 1358 | } |
| 1359 | |
| 1360 | return; |
| 1361 | |
| 1362 | err_cleanup: |
| 1363 | ips_debugfs_cleanup(ips); |
| 1364 | return; |
| 1365 | } |
| 1366 | #endif /* CONFIG_DEBUG_FS */ |
| 1367 | |
| 1368 | /** |
| 1369 | * ips_detect_cpu - detect whether CPU supports IPS |
| 1370 | * |
| 1371 | * Walk our list and see if we're on a supported CPU. If we find one, |
| 1372 | * return the limits for it. |
| 1373 | */ |
| 1374 | static struct ips_mcp_limits *ips_detect_cpu(struct ips_driver *ips) |
| 1375 | { |
| 1376 | u64 turbo_power, misc_en; |
| 1377 | struct ips_mcp_limits *limits = NULL; |
| 1378 | u16 tdp; |
| 1379 | |
| 1380 | if (!(boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model == 37)) { |
| 1381 | dev_info(&ips->dev->dev, "Non-IPS CPU detected.\n"); |
| 1382 | goto out; |
| 1383 | } |
| 1384 | |
| 1385 | rdmsrl(IA32_MISC_ENABLE, misc_en); |
| 1386 | /* |
| 1387 | * If the turbo enable bit isn't set, we shouldn't try to enable/disable |
| 1388 | * turbo manually or we'll get an illegal MSR access, even though |
| 1389 | * turbo will still be available. |
| 1390 | */ |
Jesse Barnes | 354aeeb | 2010-09-23 23:49:28 +0200 | [diff] [blame] | 1391 | if (misc_en & IA32_MISC_TURBO_EN) |
| 1392 | ips->turbo_toggle_allowed = true; |
| 1393 | else |
| 1394 | ips->turbo_toggle_allowed = false; |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 1395 | |
| 1396 | if (strstr(boot_cpu_data.x86_model_id, "CPU M")) |
| 1397 | limits = &ips_sv_limits; |
| 1398 | else if (strstr(boot_cpu_data.x86_model_id, "CPU L")) |
| 1399 | limits = &ips_lv_limits; |
| 1400 | else if (strstr(boot_cpu_data.x86_model_id, "CPU U")) |
| 1401 | limits = &ips_ulv_limits; |
Dan Carpenter | 52d7ee5 | 2010-08-08 00:01:12 +0200 | [diff] [blame] | 1402 | else { |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 1403 | dev_info(&ips->dev->dev, "No CPUID match found.\n"); |
Dan Carpenter | 52d7ee5 | 2010-08-08 00:01:12 +0200 | [diff] [blame] | 1404 | goto out; |
| 1405 | } |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 1406 | |
| 1407 | rdmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_power); |
| 1408 | tdp = turbo_power & TURBO_TDP_MASK; |
| 1409 | |
| 1410 | /* Sanity check TDP against CPU */ |
Jesse Barnes | 4fd07ac | 2010-10-05 11:26:22 -0700 | [diff] [blame] | 1411 | if (limits->core_power_limit != (tdp / 8) * 1000) { |
| 1412 | dev_info(&ips->dev->dev, "CPU TDP doesn't match expected value (found %d, expected %d)\n", |
| 1413 | tdp / 8, limits->core_power_limit / 1000); |
| 1414 | limits->core_power_limit = (tdp / 8) * 1000; |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 1415 | } |
| 1416 | |
| 1417 | out: |
| 1418 | return limits; |
| 1419 | } |
| 1420 | |
| 1421 | /** |
| 1422 | * ips_get_i915_syms - try to get GPU control methods from i915 driver |
| 1423 | * @ips: IPS driver |
| 1424 | * |
| 1425 | * The i915 driver exports several interfaces to allow the IPS driver to |
| 1426 | * monitor and control graphics turbo mode. If we can find them, we can |
| 1427 | * enable graphics turbo, otherwise we must disable it to avoid exceeding |
| 1428 | * thermal and power limits in the MCP. |
| 1429 | */ |
| 1430 | static bool ips_get_i915_syms(struct ips_driver *ips) |
| 1431 | { |
| 1432 | ips->read_mch_val = symbol_get(i915_read_mch_val); |
| 1433 | if (!ips->read_mch_val) |
| 1434 | goto out_err; |
| 1435 | ips->gpu_raise = symbol_get(i915_gpu_raise); |
| 1436 | if (!ips->gpu_raise) |
| 1437 | goto out_put_mch; |
| 1438 | ips->gpu_lower = symbol_get(i915_gpu_lower); |
| 1439 | if (!ips->gpu_lower) |
| 1440 | goto out_put_raise; |
| 1441 | ips->gpu_busy = symbol_get(i915_gpu_busy); |
| 1442 | if (!ips->gpu_busy) |
| 1443 | goto out_put_lower; |
| 1444 | ips->gpu_turbo_disable = symbol_get(i915_gpu_turbo_disable); |
| 1445 | if (!ips->gpu_turbo_disable) |
| 1446 | goto out_put_busy; |
| 1447 | |
| 1448 | return true; |
| 1449 | |
| 1450 | out_put_busy: |
minskey guo | fed522f | 2010-09-17 14:03:15 +0800 | [diff] [blame] | 1451 | symbol_put(i915_gpu_busy); |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 1452 | out_put_lower: |
| 1453 | symbol_put(i915_gpu_lower); |
| 1454 | out_put_raise: |
| 1455 | symbol_put(i915_gpu_raise); |
| 1456 | out_put_mch: |
| 1457 | symbol_put(i915_read_mch_val); |
| 1458 | out_err: |
| 1459 | return false; |
| 1460 | } |
| 1461 | |
Eric Anholt | 63ee41d | 2010-12-20 18:40:06 -0800 | [diff] [blame] | 1462 | static bool |
| 1463 | ips_gpu_turbo_enabled(struct ips_driver *ips) |
| 1464 | { |
| 1465 | if (!ips->gpu_busy && late_i915_load) { |
| 1466 | if (ips_get_i915_syms(ips)) { |
| 1467 | dev_info(&ips->dev->dev, |
| 1468 | "i915 driver attached, reenabling gpu turbo\n"); |
| 1469 | ips->gpu_turbo_enabled = !(thm_readl(THM_HTS) & HTS_GTD_DIS); |
| 1470 | } |
| 1471 | } |
| 1472 | |
| 1473 | return ips->gpu_turbo_enabled; |
| 1474 | } |
| 1475 | |
| 1476 | void |
Randy Dunlap | 7027d8b | 2011-01-08 19:55:40 -0800 | [diff] [blame] | 1477 | ips_link_to_i915_driver(void) |
Eric Anholt | 63ee41d | 2010-12-20 18:40:06 -0800 | [diff] [blame] | 1478 | { |
| 1479 | /* We can't cleanly get at the various ips_driver structs from |
| 1480 | * this caller (the i915 driver), so just set a flag saying |
| 1481 | * that it's time to try getting the symbols again. |
| 1482 | */ |
| 1483 | late_i915_load = true; |
| 1484 | } |
| 1485 | EXPORT_SYMBOL_GPL(ips_link_to_i915_driver); |
| 1486 | |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 1487 | static DEFINE_PCI_DEVICE_TABLE(ips_id_table) = { |
| 1488 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, |
| 1489 | PCI_DEVICE_ID_INTEL_THERMAL_SENSOR), }, |
| 1490 | { 0, } |
| 1491 | }; |
| 1492 | |
| 1493 | MODULE_DEVICE_TABLE(pci, ips_id_table); |
| 1494 | |
| 1495 | static int ips_probe(struct pci_dev *dev, const struct pci_device_id *id) |
| 1496 | { |
| 1497 | u64 platform_info; |
| 1498 | struct ips_driver *ips; |
| 1499 | u32 hts; |
| 1500 | int ret = 0; |
| 1501 | u16 htshi, trc, trc_required_mask; |
| 1502 | u8 tse; |
| 1503 | |
| 1504 | ips = kzalloc(sizeof(struct ips_driver), GFP_KERNEL); |
| 1505 | if (!ips) |
| 1506 | return -ENOMEM; |
| 1507 | |
| 1508 | pci_set_drvdata(dev, ips); |
| 1509 | ips->dev = dev; |
| 1510 | |
| 1511 | ips->limits = ips_detect_cpu(ips); |
| 1512 | if (!ips->limits) { |
| 1513 | dev_info(&dev->dev, "IPS not supported on this CPU\n"); |
| 1514 | ret = -ENXIO; |
| 1515 | goto error_free; |
| 1516 | } |
| 1517 | |
| 1518 | spin_lock_init(&ips->turbo_status_lock); |
| 1519 | |
Kulikov Vasiliy | 5629236 | 2010-08-03 19:44:16 +0400 | [diff] [blame] | 1520 | ret = pci_enable_device(dev); |
| 1521 | if (ret) { |
| 1522 | dev_err(&dev->dev, "can't enable PCI device, aborting\n"); |
| 1523 | goto error_free; |
| 1524 | } |
| 1525 | |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 1526 | if (!pci_resource_start(dev, 0)) { |
| 1527 | dev_err(&dev->dev, "TBAR not assigned, aborting\n"); |
| 1528 | ret = -ENXIO; |
| 1529 | goto error_free; |
| 1530 | } |
| 1531 | |
| 1532 | ret = pci_request_regions(dev, "ips thermal sensor"); |
| 1533 | if (ret) { |
| 1534 | dev_err(&dev->dev, "thermal resource busy, aborting\n"); |
| 1535 | goto error_free; |
| 1536 | } |
| 1537 | |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 1538 | |
| 1539 | ips->regmap = ioremap(pci_resource_start(dev, 0), |
| 1540 | pci_resource_len(dev, 0)); |
| 1541 | if (!ips->regmap) { |
| 1542 | dev_err(&dev->dev, "failed to map thermal regs, aborting\n"); |
| 1543 | ret = -EBUSY; |
| 1544 | goto error_release; |
| 1545 | } |
| 1546 | |
| 1547 | tse = thm_readb(THM_TSE); |
| 1548 | if (tse != TSE_EN) { |
| 1549 | dev_err(&dev->dev, "thermal device not enabled (0x%02x), aborting\n", tse); |
| 1550 | ret = -ENXIO; |
| 1551 | goto error_unmap; |
| 1552 | } |
| 1553 | |
| 1554 | trc = thm_readw(THM_TRC); |
| 1555 | trc_required_mask = TRC_CORE1_EN | TRC_CORE_PWR | TRC_MCH_EN; |
| 1556 | if ((trc & trc_required_mask) != trc_required_mask) { |
| 1557 | dev_err(&dev->dev, "thermal reporting for required devices not enabled, aborting\n"); |
| 1558 | ret = -ENXIO; |
| 1559 | goto error_unmap; |
| 1560 | } |
| 1561 | |
| 1562 | if (trc & TRC_CORE2_EN) |
| 1563 | ips->second_cpu = true; |
| 1564 | |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 1565 | update_turbo_limits(ips); |
| 1566 | dev_dbg(&dev->dev, "max cpu power clamp: %dW\n", |
| 1567 | ips->mcp_power_limit / 10); |
| 1568 | dev_dbg(&dev->dev, "max core power clamp: %dW\n", |
| 1569 | ips->core_power_limit / 10); |
| 1570 | /* BIOS may update limits at runtime */ |
| 1571 | if (thm_readl(THM_PSC) & PSP_PBRT) |
| 1572 | ips->poll_turbo_status = true; |
| 1573 | |
Jesse Barnes | 0385e52 | 2010-05-20 14:27:23 -0700 | [diff] [blame] | 1574 | if (!ips_get_i915_syms(ips)) { |
| 1575 | dev_err(&dev->dev, "failed to get i915 symbols, graphics turbo disabled\n"); |
| 1576 | ips->gpu_turbo_enabled = false; |
| 1577 | } else { |
| 1578 | dev_dbg(&dev->dev, "graphics turbo enabled\n"); |
| 1579 | ips->gpu_turbo_enabled = true; |
| 1580 | } |
| 1581 | |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 1582 | /* |
| 1583 | * Check PLATFORM_INFO MSR to make sure this chip is |
| 1584 | * turbo capable. |
| 1585 | */ |
| 1586 | rdmsrl(PLATFORM_INFO, platform_info); |
| 1587 | if (!(platform_info & PLATFORM_TDP)) { |
| 1588 | dev_err(&dev->dev, "platform indicates TDP override unavailable, aborting\n"); |
| 1589 | ret = -ENODEV; |
| 1590 | goto error_unmap; |
| 1591 | } |
| 1592 | |
| 1593 | /* |
| 1594 | * IRQ handler for ME interaction |
| 1595 | * Note: don't use MSI here as the PCH has bugs. |
| 1596 | */ |
| 1597 | pci_disable_msi(dev); |
| 1598 | ret = request_irq(dev->irq, ips_irq_handler, IRQF_SHARED, "ips", |
| 1599 | ips); |
| 1600 | if (ret) { |
| 1601 | dev_err(&dev->dev, "request irq failed, aborting\n"); |
| 1602 | goto error_unmap; |
| 1603 | } |
| 1604 | |
| 1605 | /* Enable aux, hot & critical interrupts */ |
| 1606 | thm_writeb(THM_TSPIEN, TSPIEN_AUX2_LOHI | TSPIEN_CRIT_LOHI | |
| 1607 | TSPIEN_HOT_LOHI | TSPIEN_AUX_LOHI); |
| 1608 | thm_writeb(THM_TEN, TEN_UPDATE_EN); |
| 1609 | |
| 1610 | /* Collect adjustment values */ |
| 1611 | ips->cta_val = thm_readw(THM_CTA); |
| 1612 | ips->pta_val = thm_readw(THM_PTA); |
| 1613 | ips->mgta_val = thm_readw(THM_MGTA); |
| 1614 | |
| 1615 | /* Save turbo limits & ratios */ |
| 1616 | rdmsrl(TURBO_POWER_CURRENT_LIMIT, ips->orig_turbo_limit); |
| 1617 | |
Jesse Barnes | 96f3823 | 2010-10-05 14:50:59 -0400 | [diff] [blame] | 1618 | ips_disable_cpu_turbo(ips); |
| 1619 | ips->cpu_turbo_enabled = false; |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 1620 | |
minskey guo | a7abda8 | 2010-09-17 14:03:27 +0800 | [diff] [blame] | 1621 | /* Create thermal adjust thread */ |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 1622 | ips->adjust = kthread_create(ips_adjust, ips, "ips-adjust"); |
| 1623 | if (IS_ERR(ips->adjust)) { |
| 1624 | dev_err(&dev->dev, |
| 1625 | "failed to create thermal adjust thread, aborting\n"); |
| 1626 | ret = -ENOMEM; |
minskey guo | a7abda8 | 2010-09-17 14:03:27 +0800 | [diff] [blame] | 1627 | goto error_free_irq; |
| 1628 | |
| 1629 | } |
| 1630 | |
| 1631 | /* |
| 1632 | * Set up the work queue and monitor thread. The monitor thread |
| 1633 | * will wake up ips_adjust thread. |
| 1634 | */ |
| 1635 | ips->monitor = kthread_run(ips_monitor, ips, "ips-monitor"); |
| 1636 | if (IS_ERR(ips->monitor)) { |
| 1637 | dev_err(&dev->dev, |
| 1638 | "failed to create thermal monitor thread, aborting\n"); |
| 1639 | ret = -ENOMEM; |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 1640 | goto error_thread_cleanup; |
| 1641 | } |
| 1642 | |
| 1643 | hts = (ips->core_power_limit << HTS_PCPL_SHIFT) | |
| 1644 | (ips->mcp_temp_limit << HTS_PTL_SHIFT) | HTS_NVV; |
| 1645 | htshi = HTS2_PRST_RUNNING << HTS2_PRST_SHIFT; |
| 1646 | |
| 1647 | thm_writew(THM_HTSHI, htshi); |
| 1648 | thm_writel(THM_HTS, hts); |
| 1649 | |
| 1650 | ips_debugfs_init(ips); |
| 1651 | |
| 1652 | dev_info(&dev->dev, "IPS driver initialized, MCP temp limit %d\n", |
| 1653 | ips->mcp_temp_limit); |
| 1654 | return ret; |
| 1655 | |
| 1656 | error_thread_cleanup: |
minskey guo | a7abda8 | 2010-09-17 14:03:27 +0800 | [diff] [blame] | 1657 | kthread_stop(ips->adjust); |
Jesse Barnes | aa7ffc0 | 2010-05-14 15:41:14 -0700 | [diff] [blame] | 1658 | error_free_irq: |
| 1659 | free_irq(ips->dev->irq, ips); |
| 1660 | error_unmap: |
| 1661 | iounmap(ips->regmap); |
| 1662 | error_release: |
| 1663 | pci_release_regions(dev); |
| 1664 | error_free: |
| 1665 | kfree(ips); |
| 1666 | return ret; |
| 1667 | } |
| 1668 | |
| 1669 | static void ips_remove(struct pci_dev *dev) |
| 1670 | { |
| 1671 | struct ips_driver *ips = pci_get_drvdata(dev); |
| 1672 | u64 turbo_override; |
| 1673 | |
| 1674 | if (!ips) |
| 1675 | return; |
| 1676 | |
| 1677 | ips_debugfs_cleanup(ips); |
| 1678 | |
| 1679 | /* Release i915 driver */ |
| 1680 | if (ips->read_mch_val) |
| 1681 | symbol_put(i915_read_mch_val); |
| 1682 | if (ips->gpu_raise) |
| 1683 | symbol_put(i915_gpu_raise); |
| 1684 | if (ips->gpu_lower) |
| 1685 | symbol_put(i915_gpu_lower); |
| 1686 | if (ips->gpu_busy) |
| 1687 | symbol_put(i915_gpu_busy); |
| 1688 | if (ips->gpu_turbo_disable) |
| 1689 | symbol_put(i915_gpu_turbo_disable); |
| 1690 | |
| 1691 | rdmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_override); |
| 1692 | turbo_override &= ~(TURBO_TDC_OVR_EN | TURBO_TDP_OVR_EN); |
| 1693 | wrmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_override); |
| 1694 | wrmsrl(TURBO_POWER_CURRENT_LIMIT, ips->orig_turbo_limit); |
| 1695 | |
| 1696 | free_irq(ips->dev->irq, ips); |
| 1697 | if (ips->adjust) |
| 1698 | kthread_stop(ips->adjust); |
| 1699 | if (ips->monitor) |
| 1700 | kthread_stop(ips->monitor); |
| 1701 | iounmap(ips->regmap); |
| 1702 | pci_release_regions(dev); |
| 1703 | kfree(ips); |
| 1704 | dev_dbg(&dev->dev, "IPS driver removed\n"); |
| 1705 | } |
| 1706 | |
| 1707 | #ifdef CONFIG_PM |
| 1708 | static int ips_suspend(struct pci_dev *dev, pm_message_t state) |
| 1709 | { |
| 1710 | return 0; |
| 1711 | } |
| 1712 | |
| 1713 | static int ips_resume(struct pci_dev *dev) |
| 1714 | { |
| 1715 | return 0; |
| 1716 | } |
| 1717 | #else |
| 1718 | #define ips_suspend NULL |
| 1719 | #define ips_resume NULL |
| 1720 | #endif /* CONFIG_PM */ |
| 1721 | |
| 1722 | static void ips_shutdown(struct pci_dev *dev) |
| 1723 | { |
| 1724 | } |
| 1725 | |
| 1726 | static struct pci_driver ips_pci_driver = { |
| 1727 | .name = "intel ips", |
| 1728 | .id_table = ips_id_table, |
| 1729 | .probe = ips_probe, |
| 1730 | .remove = ips_remove, |
| 1731 | .suspend = ips_suspend, |
| 1732 | .resume = ips_resume, |
| 1733 | .shutdown = ips_shutdown, |
| 1734 | }; |
| 1735 | |
| 1736 | static int __init ips_init(void) |
| 1737 | { |
| 1738 | return pci_register_driver(&ips_pci_driver); |
| 1739 | } |
| 1740 | module_init(ips_init); |
| 1741 | |
| 1742 | static void ips_exit(void) |
| 1743 | { |
| 1744 | pci_unregister_driver(&ips_pci_driver); |
| 1745 | return; |
| 1746 | } |
| 1747 | module_exit(ips_exit); |
| 1748 | |
| 1749 | MODULE_LICENSE("GPL"); |
| 1750 | MODULE_AUTHOR("Jesse Barnes <jbarnes@virtuousgeek.org>"); |
| 1751 | MODULE_DESCRIPTION("Intelligent Power Sharing Driver"); |