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Diffstat (limited to 'drivers/platform/x86/intel_ips.c')
| -rw-r--r-- | drivers/platform/x86/intel_ips.c | 1660 |
1 files changed, 1660 insertions, 0 deletions
diff --git a/drivers/platform/x86/intel_ips.c b/drivers/platform/x86/intel_ips.c new file mode 100644 index 00000000000..afe82e50dfe --- /dev/null +++ b/drivers/platform/x86/intel_ips.c @@ -0,0 +1,1660 @@ +/* + * Copyright (c) 2009-2010 Intel Corporation + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + * Authors: + * Jesse Barnes <jbarnes@virtuousgeek.org> + */ + +/* + * Some Intel Ibex Peak based platforms support so-called "intelligent + * power sharing", which allows the CPU and GPU to cooperate to maximize + * performance within a given TDP (thermal design point). This driver + * performs the coordination between the CPU and GPU, monitors thermal and + * power statistics in the platform, and initializes power monitoring + * hardware. It also provides a few tunables to control behavior. Its + * primary purpose is to safely allow CPU and GPU turbo modes to be enabled + * by tracking power and thermal budget; secondarily it can boost turbo + * performance by allocating more power or thermal budget to the CPU or GPU + * based on available headroom and activity. + * + * The basic algorithm is driven by a 5s moving average of tempurature. If + * thermal headroom is available, the CPU and/or GPU power clamps may be + * adjusted upwards. If we hit the thermal ceiling or a thermal trigger, + * we scale back the clamp. Aside from trigger events (when we're critically + * close or over our TDP) we don't adjust the clamps more than once every + * five seconds. + * + * The thermal device (device 31, function 6) has a set of registers that + * are updated by the ME firmware. The ME should also take the clamp values + * written to those registers and write them to the CPU, but we currently + * bypass that functionality and write the CPU MSR directly. + * + * UNSUPPORTED: + * - dual MCP configs + * + * TODO: + * - handle CPU hotplug + * - provide turbo enable/disable api + * - make sure we can write turbo enable/disable reg based on MISC_EN + * + * Related documents: + * - CDI 403777, 403778 - Auburndale EDS vol 1 & 2 + * - CDI 401376 - Ibex Peak EDS + * - ref 26037, 26641 - IPS BIOS spec + * - ref 26489 - Nehalem BIOS writer's guide + * - ref 26921 - Ibex Peak BIOS Specification + */ + +#include <linux/debugfs.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/kthread.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/sched.h> +#include <linux/seq_file.h> +#include <linux/string.h> +#include <linux/tick.h> +#include <linux/timer.h> +#include <drm/i915_drm.h> +#include <asm/msr.h> +#include <asm/processor.h> + +#define PCI_DEVICE_ID_INTEL_THERMAL_SENSOR 0x3b32 + +/* + * Package level MSRs for monitor/control + */ +#define PLATFORM_INFO 0xce +#define PLATFORM_TDP (1<<29) +#define PLATFORM_RATIO (1<<28) + +#define IA32_MISC_ENABLE 0x1a0 +#define IA32_MISC_TURBO_EN (1ULL<<38) + +#define TURBO_POWER_CURRENT_LIMIT 0x1ac +#define TURBO_TDC_OVR_EN (1UL<<31) +#define TURBO_TDC_MASK (0x000000007fff0000UL) +#define TURBO_TDC_SHIFT (16) +#define TURBO_TDP_OVR_EN (1UL<<15) +#define TURBO_TDP_MASK (0x0000000000003fffUL) + +/* + * Core/thread MSRs for monitoring + */ +#define IA32_PERF_CTL 0x199 +#define IA32_PERF_TURBO_DIS (1ULL<<32) + +/* + * Thermal PCI device regs + */ +#define THM_CFG_TBAR 0x10 +#define THM_CFG_TBAR_HI 0x14 + +#define THM_TSIU 0x00 +#define THM_TSE 0x01 +#define TSE_EN 0xb8 +#define THM_TSS 0x02 +#define THM_TSTR 0x03 +#define THM_TSTTP 0x04 +#define THM_TSCO 0x08 +#define THM_TSES 0x0c +#define THM_TSGPEN 0x0d +#define TSGPEN_HOT_LOHI (1<<1) +#define TSGPEN_CRIT_LOHI (1<<2) +#define THM_TSPC 0x0e +#define THM_PPEC 0x10 +#define THM_CTA 0x12 +#define THM_PTA 0x14 +#define PTA_SLOPE_MASK (0xff00) +#define PTA_SLOPE_SHIFT 8 +#define PTA_OFFSET_MASK (0x00ff) +#define THM_MGTA 0x16 +#define MGTA_SLOPE_MASK (0xff00) +#define MGTA_SLOPE_SHIFT 8 +#define MGTA_OFFSET_MASK (0x00ff) +#define THM_TRC 0x1a +#define TRC_CORE2_EN (1<<15) +#define TRC_THM_EN (1<<12) +#define TRC_C6_WAR (1<<8) +#define TRC_CORE1_EN (1<<7) +#define TRC_CORE_PWR (1<<6) +#define TRC_PCH_EN (1<<5) +#define TRC_MCH_EN (1<<4) +#define TRC_DIMM4 (1<<3) +#define TRC_DIMM3 (1<<2) +#define TRC_DIMM2 (1<<1) +#define TRC_DIMM1 (1<<0) +#define THM_TES 0x20 +#define THM_TEN 0x21 +#define TEN_UPDATE_EN 1 +#define THM_PSC 0x24 +#define PSC_NTG (1<<0) /* No GFX turbo support */ +#define PSC_NTPC (1<<1) /* No CPU turbo support */ +#define PSC_PP_DEF (0<<2) /* Perf policy up to driver */ +#define PSP_PP_PC (1<<2) /* BIOS prefers CPU perf */ +#define PSP_PP_BAL (2<<2) /* BIOS wants balanced perf */ +#define PSP_PP_GFX (3<<2) /* BIOS prefers GFX perf */ +#define PSP_PBRT (1<<4) /* BIOS run time support */ +#define THM_CTV1 0x30 +#define CTV_TEMP_ERROR (1<<15) +#define CTV_TEMP_MASK 0x3f +#define CTV_ +#define THM_CTV2 0x32 +#define THM_CEC 0x34 /* undocumented power accumulator in joules */ +#define THM_AE 0x3f +#define THM_HTS 0x50 /* 32 bits */ +#define HTS_PCPL_MASK (0x7fe00000) +#define HTS_PCPL_SHIFT 21 +#define HTS_GPL_MASK (0x001ff000) +#define HTS_GPL_SHIFT 12 +#define HTS_PP_MASK (0x00000c00) +#define HTS_PP_SHIFT 10 +#define HTS_PP_DEF 0 +#define HTS_PP_PROC 1 +#define HTS_PP_BAL 2 +#define HTS_PP_GFX 3 +#define HTS_PCTD_DIS (1<<9) +#define HTS_GTD_DIS (1<<8) +#define HTS_PTL_MASK (0x000000fe) +#define HTS_PTL_SHIFT 1 +#define HTS_NVV (1<<0) +#define THM_HTSHI 0x54 /* 16 bits */ +#define HTS2_PPL_MASK (0x03ff) +#define HTS2_PRST_MASK (0x3c00) +#define HTS2_PRST_SHIFT 10 +#define HTS2_PRST_UNLOADED 0 +#define HTS2_PRST_RUNNING 1 +#define HTS2_PRST_TDISOP 2 /* turbo disabled due to power */ +#define HTS2_PRST_TDISHT 3 /* turbo disabled due to high temp */ +#define HTS2_PRST_TDISUSR 4 /* user disabled turbo */ +#define HTS2_PRST_TDISPLAT 5 /* platform disabled turbo */ +#define HTS2_PRST_TDISPM 6 /* power management disabled turbo */ +#define HTS2_PRST_TDISERR 7 /* some kind of error disabled turbo */ +#define THM_PTL 0x56 +#define THM_MGTV 0x58 +#define TV_MASK 0x000000000000ff00 +#define TV_SHIFT 8 +#define THM_PTV 0x60 +#define PTV_MASK 0x00ff +#define THM_MMGPC 0x64 +#define THM_MPPC 0x66 +#define THM_MPCPC 0x68 +#define THM_TSPIEN 0x82 +#define TSPIEN_AUX_LOHI (1<<0) +#define TSPIEN_HOT_LOHI (1<<1) +#define TSPIEN_CRIT_LOHI (1<<2) +#define TSPIEN_AUX2_LOHI (1<<3) +#define THM_TSLOCK 0x83 +#define THM_ATR 0x84 +#define THM_TOF 0x87 +#define THM_STS 0x98 +#define STS_PCPL_MASK (0x7fe00000) +#define STS_PCPL_SHIFT 21 +#define STS_GPL_MASK (0x001ff000) +#define STS_GPL_SHIFT 12 +#define STS_PP_MASK (0x00000c00) +#define STS_PP_SHIFT 10 +#define STS_PP_DEF 0 +#define STS_PP_PROC 1 +#define STS_PP_BAL 2 +#define STS_PP_GFX 3 +#define STS_PCTD_DIS (1<<9) +#define STS_GTD_DIS (1<<8) +#define STS_PTL_MASK (0x000000fe) +#define STS_PTL_SHIFT 1 +#define STS_NVV (1<<0) +#define THM_SEC 0x9c +#define SEC_ACK (1<<0) +#define THM_TC3 0xa4 +#define THM_TC1 0xa8 +#define STS_PPL_MASK (0x0003ff00) +#define STS_PPL_SHIFT 16 +#define THM_TC2 0xac +#define THM_DTV 0xb0 +#define THM_ITV 0xd8 +#define ITV_ME_SEQNO_MASK 0x000f0000 /* ME should update every ~200ms */ +#define ITV_ME_SEQNO_SHIFT (16) +#define ITV_MCH_TEMP_MASK 0x0000ff00 +#define ITV_MCH_TEMP_SHIFT (8) +#define ITV_PCH_TEMP_MASK 0x000000ff + +#define thm_readb(off) readb(ips->regmap + (off)) +#define thm_readw(off) readw(ips->regmap + (off)) +#define thm_readl(off) readl(ips->regmap + (off)) +#define thm_readq(off) readq(ips->regmap + (off)) + +#define thm_writeb(off, val) writeb((val), ips->regmap + (off)) +#define thm_writew(off, val) writew((val), ips->regmap + (off)) +#define thm_writel(off, val) writel((val), ips->regmap + (off)) + +static const int IPS_ADJUST_PERIOD = 5000; /* ms */ + +/* For initial average collection */ +static const int IPS_SAMPLE_PERIOD = 200; /* ms */ +static const int IPS_SAMPLE_WINDOW = 5000; /* 5s moving window of samples */ +#define IPS_SAMPLE_COUNT (IPS_SAMPLE_WINDOW / IPS_SAMPLE_PERIOD) + +/* Per-SKU limits */ +struct ips_mcp_limits { + int cpu_family; + int cpu_model; /* includes extended model... */ + int mcp_power_limit; /* mW units */ + int core_power_limit; + int mch_power_limit; + int core_temp_limit; /* degrees C */ + int mch_temp_limit; +}; + +/* Max temps are -10 degrees C to avoid PROCHOT# */ + +struct ips_mcp_limits ips_sv_limits = { + .mcp_power_limit = 35000, + .core_power_limit = 29000, + .mch_power_limit = 20000, + .core_temp_limit = 95, + .mch_temp_limit = 90 +}; + +struct ips_mcp_limits ips_lv_limits = { + .mcp_power_limit = 25000, + .core_power_limit = 21000, + .mch_power_limit = 13000, + .core_temp_limit = 95, + .mch_temp_limit = 90 +}; + +struct ips_mcp_limits ips_ulv_limits = { + .mcp_power_limit = 18000, + .core_power_limit = 14000, + .mch_power_limit = 11000, + .core_temp_limit = 95, + .mch_temp_limit = 90 +}; + +struct ips_driver { + struct pci_dev *dev; + void *regmap; + struct task_struct *monitor; + struct task_struct *adjust; + struct dentry *debug_root; + + /* Average CPU core temps (all averages in .01 degrees C for precision) */ + u16 ctv1_avg_temp; + u16 ctv2_avg_temp; + /* GMCH average */ + u16 mch_avg_temp; + /* Average for the CPU (both cores?) */ + u16 mcp_avg_temp; + /* Average power consumption (in mW) */ + u32 cpu_avg_power; + u32 mch_avg_power; + + /* Offset values */ + u16 cta_val; + u16 pta_val; + u16 mgta_val; + + /* Maximums & prefs, protected by turbo status lock */ + spinlock_t turbo_status_lock; + u16 mcp_temp_limit; + u16 mcp_power_limit; + u16 core_power_limit; + u16 mch_power_limit; + bool cpu_turbo_enabled; + bool __cpu_turbo_on; + bool gpu_turbo_enabled; + bool __gpu_turbo_on; + bool gpu_preferred; + bool poll_turbo_status; + bool second_cpu; + struct ips_mcp_limits *limits; + + /* Optional MCH interfaces for if i915 is in use */ + unsigned long (*read_mch_val)(void); + bool (*gpu_raise)(void); + bool (*gpu_lower)(void); + bool (*gpu_busy)(void); + bool (*gpu_turbo_disable)(void); + + /* For restoration at unload */ + u64 orig_turbo_limit; + u64 orig_turbo_ratios; +}; + +/** + * ips_cpu_busy - is CPU busy? + * @ips: IPS driver struct + * + * Check CPU for load to see whether we should increase its thermal budget. + * + * RETURNS: + * True if the CPU could use more power, false otherwise. + */ +static bool ips_cpu_busy(struct ips_driver *ips) +{ + if ((avenrun[0] >> FSHIFT) > 1) + return true; + + return false; +} + +/** + * ips_cpu_raise - raise CPU power clamp + * @ips: IPS driver struct + * + * Raise the CPU power clamp by %IPS_CPU_STEP, in accordance with TDP for + * this platform. + * + * We do this by adjusting the TURBO_POWER_CURRENT_LIMIT MSR upwards (as + * long as we haven't hit the TDP limit for the SKU). + */ +static void ips_cpu_raise(struct ips_driver *ips) +{ + u64 turbo_override; + u16 cur_tdp_limit, new_tdp_limit; + + if (!ips->cpu_turbo_enabled) + return; + + rdmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_override); + + cur_tdp_limit = turbo_override & TURBO_TDP_MASK; + new_tdp_limit = cur_tdp_limit + 8; /* 1W increase */ + + /* Clamp to SKU TDP limit */ + if (((new_tdp_limit * 10) / 8) > ips->core_power_limit) + new_tdp_limit = cur_tdp_limit; + + thm_writew(THM_MPCPC, (new_tdp_limit * 10) / 8); + + turbo_override |= TURBO_TDC_OVR_EN | TURBO_TDC_OVR_EN; + wrmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_override); + + turbo_override &= ~TURBO_TDP_MASK; + turbo_override |= new_tdp_limit; + + wrmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_override); +} + +/** + * ips_cpu_lower - lower CPU power clamp + * @ips: IPS driver struct + * + * Lower CPU power clamp b %IPS_CPU_STEP if possible. + * + * We do this by adjusting the TURBO_POWER_CURRENT_LIMIT MSR down, going + * as low as the platform limits will allow (though we could go lower there + * wouldn't be much point). + */ +static void ips_cpu_lower(struct ips_driver *ips) +{ + u64 turbo_override; + u16 cur_limit, new_limit; + + rdmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_override); + + cur_limit = turbo_override & TURBO_TDP_MASK; + new_limit = cur_limit - 8; /* 1W decrease */ + + /* Clamp to SKU TDP limit */ + if (((new_limit * 10) / 8) < (ips->orig_turbo_limit & TURBO_TDP_MASK)) + new_limit = ips->orig_turbo_limit & TURBO_TDP_MASK; + + thm_writew(THM_MPCPC, (new_limit * 10) / 8); + + turbo_override |= TURBO_TDC_OVR_EN | TURBO_TDC_OVR_EN; + wrmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_override); + + turbo_override &= ~TURBO_TDP_MASK; + turbo_override |= new_limit; + + wrmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_override); +} + +/** + * do_enable_cpu_turbo - internal turbo enable function + * @data: unused + * + * Internal function for actually updating MSRs. When we enable/disable + * turbo, we need to do it on each CPU; this function is the one called + * by on_each_cpu() when needed. + */ +static void do_enable_cpu_turbo(void *data) +{ + u64 perf_ctl; + + rdmsrl(IA32_PERF_CTL, perf_ctl); + if (perf_ctl & IA32_PERF_TURBO_DIS) { + perf_ctl &= ~IA32_PERF_TURBO_DIS; + wrmsrl(IA32_PERF_CTL, perf_ctl); + } +} + +/** + * ips_enable_cpu_turbo - enable turbo mode on all CPUs + * @ips: IPS driver struct + * + * Enable turbo mode by clearing the disable bit in IA32_PERF_CTL on + * all logical threads. + */ +static void ips_enable_cpu_turbo(struct ips_driver *ips) +{ + /* Already on, no need to mess with MSRs */ + if (ips->__cpu_turbo_on) + return; + + on_each_cpu(do_enable_cpu_turbo, ips, 1); + + ips->__cpu_turbo_on = true; +} + +/** + * do_disable_cpu_turbo - internal turbo disable function + * @data: unused + * + * Internal function for actually updating MSRs. When we enable/disable + * turbo, we need to do it on each CPU; this function is the one called + * by on_each_cpu() when needed. + */ +static void do_disable_cpu_turbo(void *data) +{ + u64 perf_ctl; + + rdmsrl(IA32_PERF_CTL, perf_ctl); + if (!(perf_ctl & IA32_PERF_TURBO_DIS)) { + perf_ctl |= IA32_PERF_TURBO_DIS; + wrmsrl(IA32_PERF_CTL, perf_ctl); + } +} + +/** + * ips_disable_cpu_turbo - disable turbo mode on all CPUs + * @ips: IPS driver struct + * + * Disable turbo mode by setting the disable bit in IA32_PERF_CTL on + * all logical threads. + */ +static void ips_disable_cpu_turbo(struct ips_driver *ips) +{ + /* Already off, leave it */ + if (!ips->__cpu_turbo_on) + return; + + on_each_cpu(do_disable_cpu_turbo, ips, 1); + + ips->__cpu_turbo_on = false; +} + +/** + * ips_gpu_busy - is GPU busy? + * @ips: IPS driver struct + * + * Check GPU for load to see whether we should increase its thermal budget. + * We need to call into the i915 driver in this case. + * + * RETURNS: + * True if the GPU could use more power, false otherwise. + */ +static bool ips_gpu_busy(struct ips_driver *ips) +{ + if (!ips->gpu_turbo_enabled) + return false; + + return ips->gpu_busy(); +} + +/** + * ips_gpu_raise - raise GPU power clamp + * @ips: IPS driver struct + * + * Raise the GPU frequency/power if possible. We need to call into the + * i915 driver in this case. + */ +static void ips_gpu_raise(struct ips_driver *ips) +{ + if (!ips->gpu_turbo_enabled) + return; + + if (!ips->gpu_raise()) + ips->gpu_turbo_enabled = false; + + return; +} + +/** + * ips_gpu_lower - lower GPU power clamp + * @ips: IPS driver struct + * + * Lower GPU frequency/power if possible. Need to call i915. + */ +static void ips_gpu_lower(struct ips_driver *ips) +{ + if (!ips->gpu_turbo_enabled) + return; + + if (!ips->gpu_lower()) + ips->gpu_turbo_enabled = false; + + return; +} + +/** + * ips_enable_gpu_turbo - notify the gfx driver turbo is available + * @ips: IPS driver struct + * + * Call into the graphics driver indicating that it can safely use + * turbo mode. + */ +static void ips_enable_gpu_turbo(struct ips_driver *ips) +{ + if (ips->__gpu_turbo_on) + return; + ips->__gpu_turbo_on = true; +} + +/** + * ips_disable_gpu_turbo - notify the gfx driver to disable turbo mode + * @ips: IPS driver struct + * + * Request that the graphics driver disable turbo mode. + */ +static void ips_disable_gpu_turbo(struct ips_driver *ips) +{ + /* Avoid calling i915 if turbo is already disabled */ + if (!ips->__gpu_turbo_on) + return; + + if (!ips->gpu_turbo_disable()) + dev_err(&ips->dev->dev, "failed to disable graphis turbo\n"); + else + ips->__gpu_turbo_on = false; +} + +/** + * mcp_exceeded - check whether we're outside our thermal & power limits + * @ips: IPS driver struct + * + * Check whether the MCP is over its thermal or power budget. + */ +static bool mcp_exceeded(struct ips_driver *ips) +{ + unsigned long flags; + bool ret = false; + + spin_lock_irqsave(&ips->turbo_status_lock, flags); + if (ips->mcp_avg_temp > (ips->mcp_temp_limit * 100)) + ret = true; + if (ips->cpu_avg_power + ips->mch_avg_power > ips->mcp_power_limit) + ret = true; + spin_unlock_irqrestore(&ips->turbo_status_lock, flags); + + if (ret) + dev_info(&ips->dev->dev, + "MCP power or thermal limit exceeded\n"); + + return ret; +} + +/** + * cpu_exceeded - check whether a CPU core is outside its limits + * @ips: IPS driver struct + * @cpu: CPU number to check + * + * Check a given CPU's average temp or power is over its limit. + */ +static bool cpu_exceeded(struct ips_driver *ips, int cpu) +{ + unsigned long flags; + int avg; + bool ret = false; + + spin_lock_irqsave(&ips->turbo_status_lock, flags); + avg = cpu ? ips->ctv2_avg_temp : ips->ctv1_avg_temp; + if (avg > (ips->limits->core_temp_limit * 100)) + ret = true; + if (ips->cpu_avg_power > ips->core_power_limit * 100) + ret = true; + spin_unlock_irqrestore(&ips->turbo_status_lock, flags); + + if (ret) + dev_info(&ips->dev->dev, + "CPU power or thermal limit exceeded\n"); + + return ret; +} + +/** + * mch_exceeded - check whether the GPU is over budget + * @ips: IPS driver struct + * + * Check the MCH temp & power against their maximums. + */ +static bool mch_exceeded(struct ips_driver *ips) +{ + unsigned long flags; + bool ret = false; + + spin_lock_irqsave(&ips->turbo_status_lock, flags); + if (ips->mch_avg_temp > (ips->limits->mch_temp_limit * 100)) + ret = true; + if (ips->mch_avg_power > ips->mch_power_limit) + ret = true; + spin_unlock_irqrestore(&ips->turbo_status_lock, flags); + + return ret; +} + +/** + * update_turbo_limits - get various limits & settings from regs + * @ips: IPS driver struct + * + * Update the IPS power & temp limits, along with turbo enable flags, + * based on latest register contents. + * + * Used at init time and for runtime BIOS support, which requires polling + * the regs for updates (as a result of AC->DC transition for example). + * + * LOCKING: + * Caller must hold turbo_status_lock (outside of init) + */ +static void update_turbo_limits(struct ips_driver *ips) +{ + u32 hts = thm_readl(THM_HTS); + + ips->cpu_turbo_enabled = !(hts & HTS_PCTD_DIS); + ips->gpu_turbo_enabled = !(hts & HTS_GTD_DIS); + ips->core_power_limit = thm_readw(THM_MPCPC); + ips->mch_power_limit = thm_readw(THM_MMGPC); + ips->mcp_temp_limit = thm_readw(THM_PTL); + ips->mcp_power_limit = thm_readw(THM_MPPC); + + /* Ignore BIOS CPU vs GPU pref */ +} + +/** + * ips_adjust - adjust power clamp based on thermal state + * @data: ips driver structure + * + * Wake up every 5s or so and check whether we should adjust the power clamp. + * Check CPU and GPU load to determine which needs adjustment. There are + * several things to consider here: + * - do we need to adjust up or down? + * - is CPU busy? + * - is GPU busy? + * - is CPU in turbo? + * - is GPU in turbo? + * - is CPU or GPU preferred? (CPU is default) + * + * So, given the above, we do the following: + * - up (TDP available) + * - CPU not busy, GPU not busy - nothing + * - CPU busy, GPU not busy - adjust CPU up + * - CPU not busy, GPU busy - adjust GPU up + * - CPU busy, GPU busy - adjust preferred unit up, taking headroom from + * non-preferred unit if necessary + * - down (at TDP limit) + * - adjust both CPU and GPU down if possible + * + cpu+ gpu+ cpu+gpu- cpu-gpu+ cpu-gpu- +cpu < gpu < cpu+gpu+ cpu+ gpu+ nothing +cpu < gpu >= cpu+gpu-(mcp<) cpu+gpu-(mcp<) gpu- gpu- +cpu >= gpu < cpu-gpu+(mcp<) cpu- cpu-gpu+(mcp<) cpu- +cpu >= gpu >= cpu-gpu- cpu-gpu- cpu-gpu- cpu-gpu- + * + */ +static int ips_adjust(void *data) +{ + struct ips_driver *ips = data; + unsigned long flags; + + dev_dbg(&ips->dev->dev, "starting ips-adjust thread\n"); + + /* + * Adjust CPU and GPU clamps every 5s if needed. Doing it more + * often isn't recommended due to ME interaction. + */ + do { + bool cpu_busy = ips_cpu_busy(ips); + bool gpu_busy = ips_gpu_busy(ips); + + spin_lock_irqsave(&ips->turbo_status_lock, flags); + if (ips->poll_turbo_status) + update_turbo_limits(ips); + spin_unlock_irqrestore(&ips->turbo_status_lock, flags); + + /* Update turbo status if necessary */ + if (ips->cpu_turbo_enabled) + ips_enable_cpu_turbo(ips); + else + ips_disable_cpu_turbo(ips); + + if (ips->gpu_turbo_enabled) + ips_enable_gpu_turbo(ips); + else + ips_disable_gpu_turbo(ips); + + /* We're outside our comfort zone, crank them down */ + if (mcp_exceeded(ips)) { + ips_cpu_lower(ips); + ips_gpu_lower(ips); + goto sleep; + } + + if (!cpu_exceeded(ips, 0) && cpu_busy) + ips_cpu_raise(ips); + else + ips_cpu_lower(ips); + + if (!mch_exceeded(ips) && gpu_busy) + ips_gpu_raise(ips); + else + ips_gpu_lower(ips); + +sleep: + schedule_timeout_interruptible(msecs_to_jiffies(IPS_ADJUST_PERIOD)); + } while (!kthread_should_stop()); + + dev_dbg(&ips->dev->dev, "ips-adjust thread stopped\n"); + + return 0; +} + +/* + * Helpers for reading out temp/power values and calculating their + * averages for the decision making and monitoring functions. + */ + +static u16 calc_avg_temp(struct ips_driver *ips, u16 *array) +{ + u64 total = 0; + int i; + u16 avg; + + for (i = 0; i < IPS_SAMPLE_COUNT; i++) + total += (u64)(array[i] * 100); + + do_div(total, IPS_SAMPLE_COUNT); + + avg = (u16)total; + + return avg; +} + +static u16 read_mgtv(struct ips_driver *ips) +{ + u16 ret; + u64 slope, offset; + u64 val; + + val = thm_readq(THM_MGTV); + val = (val & TV_MASK) >> TV_SHIFT; + + slope = offset = thm_readw(THM_MGTA); + slope = (slope & MGTA_SLOPE_MASK) >> MGTA_SLOPE_SHIFT; + offset = offset & MGTA_OFFSET_MASK; + + ret = ((val * slope + 0x40) >> 7) + offset; + + return 0; /* MCH temp reporting buggy */ +} + +static u16 read_ptv(struct ips_driver *ips) +{ + u16 val, slope, offset; + + slope = (ips->pta_val & PTA_SLOPE_MASK) >> PTA_SLOPE_SHIFT; + offset = ips->pta_val & PTA_OFFSET_MASK; + + val = thm_readw(THM_PTV) & PTV_MASK; + + return val; +} + +static u16 read_ctv(struct ips_driver *ips, int cpu) +{ + int reg = cpu ? THM_CTV2 : THM_CTV1; + u16 val; + + val = thm_readw(reg); + if (!(val & CTV_TEMP_ERROR)) + val = (val) >> 6; /* discard fractional component */ + else + val = 0; + + return val; +} + +static u32 get_cpu_power(struct ips_driver *ips, u32 *last, int period) +{ + u32 val; + u32 ret; + + /* + * CEC is in joules/65535. Take difference over time to + * get watts. + */ + val = thm_readl(THM_CEC); + + /* period is in ms and we want mW */ + ret = (((val - *last) * 1000) / period); + ret = (ret * 1000) / 65535; + *last = val; + + return ret; +} + +static const u16 temp_decay_factor = 2; +static u16 update_average_temp(u16 avg, u16 val) +{ + u16 ret; + + /* Multiply by 100 for extra precision */ + ret = (val * 100 / temp_decay_factor) + + (((temp_decay_factor - 1) * avg) / temp_decay_factor); + return ret; +} + +static const u16 power_decay_factor = 2; +static u16 update_average_power(u32 avg, u32 val) +{ + u32 ret; + + ret = (val / power_decay_factor) + + (((power_decay_factor - 1) * avg) / power_decay_factor); + + return ret; +} + +static u32 calc_avg_power(struct ips_driver *ips, u32 *array) +{ + u64 total = 0; + u32 avg; + int i; + + for (i = 0; i < IPS_SAMPLE_COUNT; i++) + total += array[i]; + + do_div(total, IPS_SAMPLE_COUNT); + avg = (u32)total; + + return avg; +} + +static void monitor_timeout(unsigned long arg) +{ + wake_up_process((struct task_struct *)arg); +} + +/** + * ips_monitor - temp/power monitoring thread + * @data: ips driver structure + * + * This is the main function for the IPS driver. It monitors power and + * tempurature in the MCP and adjusts CPU and GPU power clams accordingly. + * + * We keep a 5s moving average of power consumption and tempurature. Using + * that data, along with CPU vs GPU preference, we adjust the power clamps + * up or down. + */ +static int ips_monitor(void *data) +{ + struct ips_driver *ips = data; + struct timer_list timer; + unsigned long seqno_timestamp, expire, last_msecs, last_sample_period; + int i; + u32 *cpu_samples, *mchp_samples, old_cpu_power; + u16 *mcp_samples, *ctv1_samples, *ctv2_samples, *mch_samples; + u8 cur_seqno, last_seqno; + + mcp_samples = kzalloc(sizeof(u16) * IPS_SAMPLE_COUNT, GFP_KERNEL); + ctv1_samples = kzalloc(sizeof(u16) * IPS_SAMPLE_COUNT, GFP_KERNEL); + ctv2_samples = kzalloc(sizeof(u16) * IPS_SAMPLE_COUNT, GFP_KERNEL); + mch_samples = kzalloc(sizeof(u16) * IPS_SAMPLE_COUNT, GFP_KERNEL); + cpu_samples = kzalloc(sizeof(u32) * IPS_SAMPLE_COUNT, GFP_KERNEL); + mchp_samples = kzalloc(sizeof(u32) * IPS_SAMPLE_COUNT, GFP_KERNEL); + if (!mcp_samples || !ctv1_samples || !ctv2_samples || !mch_samples || + !cpu_samples || !mchp_samples) { + dev_err(&ips->dev->dev, + "failed to allocate sample array, ips disabled\n"); + kfree(mcp_samples); + kfree(ctv1_samples); + kfree(ctv2_samples); + kfree(mch_samples); + kfree(cpu_samples); + kfree(mchp_samples); + kthread_stop(ips->adjust); + return -ENOMEM; + } + + last_seqno = (thm_readl(THM_ITV) & ITV_ME_SEQNO_MASK) >> + ITV_ME_SEQNO_SHIFT; + seqno_timestamp = get_jiffies_64(); + + old_cpu_power = thm_readl(THM_CEC) / 65535; + schedule_timeout_interruptible(msecs_to_jiffies(IPS_SAMPLE_PERIOD)); + + /* Collect an initial average */ + for (i = 0; i < IPS_SAMPLE_COUNT; i++) { + u32 mchp, cpu_power; + u16 val; + + mcp_samples[i] = read_ptv(ips); + + val = read_ctv(ips, 0); + ctv1_samples[i] = val; + + val = read_ctv(ips, 1); + ctv2_samples[i] = val; + + val = read_mgtv(ips); + mch_samples[i] = val; + + cpu_power = get_cpu_power(ips, &old_cpu_power, + IPS_SAMPLE_PERIOD); + cpu_samples[i] = cpu_power; + + if (ips->read_mch_val) { + mchp = ips->read_mch_val(); + mchp_samples[i] = mchp; + } + + schedule_timeout_interruptible(msecs_to_jiffies(IPS_SAMPLE_PERIOD)); + if (kthread_should_stop()) + break; + } + + ips->mcp_avg_temp = calc_avg_temp(ips, mcp_samples); + ips->ctv1_avg_temp = calc_avg_temp(ips, ctv1_samples); + ips->ctv2_avg_temp = calc_avg_temp(ips, ctv2_samples); + ips->mch_avg_temp = calc_avg_temp(ips, mch_samples); + ips->cpu_avg_power = calc_avg_power(ips, cpu_samples); + ips->mch_avg_power = calc_avg_power(ips, mchp_samples); + kfree(mcp_samples); + kfree(ctv1_samples); + kfree(ctv2_samples); + kfree(mch_samples); + kfree(cpu_samples); + kfree(mchp_samples); + + /* Start the adjustment thread now that we have data */ + wake_up_process(ips->adjust); + + /* + * Ok, now we have an initial avg. From here on out, we track the + * running avg using a decaying average calculation. This allows + * us to reduce the sample frequency if the CPU and GPU are idle. + */ + old_cpu_power = thm_readl(THM_CEC); + schedule_timeout_interruptible(msecs_to_jiffies(IPS_SAMPLE_PERIOD)); + last_sample_period = IPS_SAMPLE_PERIOD; + + setup_deferrable_timer_on_stack(&timer, monitor_timeout, + (unsigned long)current); + do { + u32 cpu_val, mch_val; + u16 val; + + /* MCP itself */ + val = read_ptv(ips); + ips->mcp_avg_temp = update_average_temp(ips->mcp_avg_temp, val); + + /* Processor 0 */ + val = read_ctv(ips, 0); + ips->ctv1_avg_temp = + update_average_temp(ips->ctv1_avg_temp, val); + /* Power */ + cpu_val = get_cpu_power(ips, &old_cpu_power, + last_sample_period); + ips->cpu_avg_power = + update_average_power(ips->cpu_avg_power, cpu_val); + + if (ips->second_cpu) { + /* Processor 1 */ + val = read_ctv(ips, 1); + ips->ctv2_avg_temp = + update_average_temp(ips->ctv2_avg_temp, val); + } + + /* MCH */ + val = read_mgtv(ips); + ips->mch_avg_temp = update_average_temp(ips->mch_avg_temp, val); + /* Power */ + if (ips->read_mch_val) { + mch_val = ips->read_mch_val(); + ips->mch_avg_power = + update_average_power(ips->mch_avg_power, + mch_val); + } + + /* + * Make sure ME is updating thermal regs. + * Note: + * If it's been more than a second since the last update, + * the ME is probably hung. + */ + cur_seqno = (thm_readl(THM_ITV) & ITV_ME_SEQNO_MASK) >> + ITV_ME_SEQNO_SHIFT; + if (cur_seqno == last_seqno && + time_after(jiffies, seqno_timestamp + HZ)) { + dev_warn(&ips->dev->dev, "ME failed to update for more than 1s, likely hung\n"); + } else { + seqno_timestamp = get_jiffies_64(); + last_seqno = cur_seqno; + } + + last_msecs = jiffies_to_msecs(jiffies); + expire = jiffies + msecs_to_jiffies(IPS_SAMPLE_PERIOD); + + __set_current_state(TASK_UNINTERRUPTIBLE); + mod_timer(&timer, expire); + schedule(); + + /* Calculate actual sample period for power averaging */ + last_sample_period = jiffies_to_msecs(jiffies) - last_msecs; + if (!last_sample_period) + last_sample_period = 1; + } while (!kthread_should_stop()); + + del_timer_sync(&timer); + destroy_timer_on_stack(&timer); + + dev_dbg(&ips->dev->dev, "ips-monitor thread stopped\n"); + + return 0; +} + +#if 0 +#define THM_DUMPW(reg) \ + { \ + u16 val = thm_readw(reg); \ + dev_dbg(&ips->dev->dev, #reg ": 0x%04x\n", val); \ + } +#define THM_DUMPL(reg) \ + { \ + u32 val = thm_readl(reg); \ + dev_dbg(&ips->dev->dev, #reg ": 0x%08x\n", val); \ + } +#define THM_DUMPQ(reg) \ + { \ + u64 val = thm_readq(reg); \ + dev_dbg(&ips->dev->dev, #reg ": 0x%016x\n", val); \ + } + +static void dump_thermal_info(struct ips_driver *ips) +{ + u16 ptl; + + ptl = thm_readw(THM_PTL); + dev_dbg(&ips->dev->dev, "Processor temp limit: %d\n", ptl); + + THM_DUMPW(THM_CTA); + THM_DUMPW(THM_TRC); + THM_DUMPW(THM_CTV1); + THM_DUMPL(THM_STS); + THM_DUMPW(THM_PTV); + THM_DUMPQ(THM_MGTV); +} +#endif + +/** + * ips_irq_handler - handle temperature triggers and other IPS events + * @irq: irq number + * @arg: unused + * + * Handle temperature limit trigger events, generally by lowering the clamps. + * If we're at a critical limit, we clamp back to the lowest possible value + * to prevent emergency shutdown. + */ +static irqreturn_t ips_irq_handler(int irq, void *arg) +{ + struct ips_driver *ips = arg; + u8 tses = thm_readb(THM_TSES); + u8 tes = thm_readb(THM_TES); + + if (!tses && !tes) + return IRQ_NONE; + + dev_info(&ips->dev->dev, "TSES: 0x%02x\n", tses); + dev_info(&ips->dev->dev, "TES: 0x%02x\n", tes); + + /* STS update from EC? */ + if (tes & 1) { + u32 sts, tc1; + + sts = thm_readl(THM_STS); + tc1 = thm_readl(THM_TC1); + + if (sts & STS_NVV) { + spin_lock(&ips->turbo_status_lock); + ips->core_power_limit = (sts & STS_PCPL_MASK) >> + STS_PCPL_SHIFT; + ips->mch_power_limit = (sts & STS_GPL_MASK) >> + STS_GPL_SHIFT; + /* ignore EC CPU vs GPU pref */ + ips->cpu_turbo_enabled = !(sts & STS_PCTD_DIS); + ips->gpu_turbo_enabled = !(sts & STS_GTD_DIS); + ips->mcp_temp_limit = (sts & STS_PTL_MASK) >> + STS_PTL_SHIFT; + ips->mcp_power_limit = (tc1 & STS_PPL_MASK) >> + STS_PPL_SHIFT; + spin_unlock(&ips->turbo_status_lock); + + thm_writeb(THM_SEC, SEC_ACK); + } + thm_writeb(THM_TES, tes); + } + + /* Thermal trip */ + if (tses) { + dev_warn(&ips->dev->dev, + "thermal trip occurred, tses: 0x%04x\n", tses); + thm_writeb(THM_TSES, tses); + } + + return IRQ_HANDLED; +} + +#ifndef CONFIG_DEBUG_FS +static void ips_debugfs_init(struct ips_driver *ips) { return; } +static void ips_debugfs_cleanup(struct ips_driver *ips) { return; } +#else + +/* Expose current state and limits in debugfs if possible */ + +struct ips_debugfs_node { + struct ips_driver *ips; + char *name; + int (*show)(struct seq_file *m, void *data); +}; + +static int show_cpu_temp(struct seq_file *m, void *data) +{ + struct ips_driver *ips = m->private; + + seq_printf(m, "%d.%02d\n", ips->ctv1_avg_temp / 100, + ips->ctv1_avg_temp % 100); + + return 0; +} + +static int show_cpu_power(struct seq_file *m, void *data) +{ + struct ips_driver *ips = m->private; + + seq_printf(m, "%dmW\n", ips->cpu_avg_power); + + return 0; +} + +static int show_cpu_clamp(struct seq_file *m, void *data) +{ + u64 turbo_override; + int tdp, tdc; + + rdmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_override); + + tdp = (int)(turbo_override & TURBO_TDP_MASK); + tdc = (int)((turbo_override & TURBO_TDC_MASK) >> TURBO_TDC_SHIFT); + + /* Convert to .1W/A units */ + tdp = tdp * 10 / 8; + tdc = tdc * 10 / 8; + + /* Watts Amperes */ + seq_printf(m, "%d.%dW %d.%dA\n", tdp / 10, tdp % 10, + tdc / 10, tdc % 10); + + return 0; +} + +static int show_mch_temp(struct seq_file *m, void *data) +{ + struct ips_driver *ips = m->private; + + seq_printf(m, "%d.%02d\n", ips->mch_avg_temp / 100, + ips->mch_avg_temp % 100); + + return 0; +} + +static int show_mch_power(struct seq_file *m, void *data) +{ + struct ips_driver *ips = m->private; + + seq_printf(m, "%dmW\n", ips->mch_avg_power); + + return 0; +} + +static struct ips_debugfs_node ips_debug_files[] = { + { NULL, "cpu_temp", show_cpu_temp }, + { NULL, "cpu_power", show_cpu_power }, + { NULL, "cpu_clamp", show_cpu_clamp }, + { NULL, "mch_temp", show_mch_temp }, + { NULL, "mch_power", show_mch_power }, +}; + +static int ips_debugfs_open(struct inode *inode, struct file *file) +{ + struct ips_debugfs_node *node = inode->i_private; + + return single_open(file, node->show, node->ips); +} + +static const struct file_operations ips_debugfs_ops = { + .owner = THIS_MODULE, + .open = ips_debugfs_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static void ips_debugfs_cleanup(struct ips_driver *ips) +{ + if (ips->debug_root) + debugfs_remove_recursive(ips->debug_root); + return; +} + +static void ips_debugfs_init(struct ips_driver *ips) +{ + int i; + + ips->debug_root = debugfs_create_dir("ips", NULL); + if (!ips->debug_root) { + dev_err(&ips->dev->dev, + "failed to create debugfs entries: %ld\n", + PTR_ERR(ips->debug_root)); + return; + } + + for (i = 0; i < ARRAY_SIZE(ips_debug_files); i++) { + struct dentry *ent; + struct ips_debugfs_node *node = &ips_debug_files[i]; + + node->ips = ips; + ent = debugfs_create_file(node->name, S_IFREG | S_IRUGO, + ips->debug_root, node, + &ips_debugfs_ops); + if (!ent) { + dev_err(&ips->dev->dev, + "failed to create debug file: %ld\n", + PTR_ERR(ent)); + goto err_cleanup; + } + } + + return; + +err_cleanup: + ips_debugfs_cleanup(ips); + return; +} +#endif /* CONFIG_DEBUG_FS */ + +/** + * ips_detect_cpu - detect whether CPU supports IPS + * + * Walk our list and see if we're on a supported CPU. If we find one, + * return the limits for it. + */ +static struct ips_mcp_limits *ips_detect_cpu(struct ips_driver *ips) +{ + u64 turbo_power, misc_en; + struct ips_mcp_limits *limits = NULL; + u16 tdp; + + if (!(boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model == 37)) { + dev_info(&ips->dev->dev, "Non-IPS CPU detected.\n"); + goto out; + } + + rdmsrl(IA32_MISC_ENABLE, misc_en); + /* + * If the turbo enable bit isn't set, we shouldn't try to enable/disable + * turbo manually or we'll get an illegal MSR access, even though + * turbo will still be available. + */ + if (!(misc_en & IA32_MISC_TURBO_EN)) + ; /* add turbo MSR write allowed flag if necessary */ + + if (strstr(boot_cpu_data.x86_model_id, "CPU M")) + limits = &ips_sv_limits; + else if (strstr(boot_cpu_data.x86_model_id, "CPU L")) + limits = &ips_lv_limits; + else if (strstr(boot_cpu_data.x86_model_id, "CPU U")) + limits = &ips_ulv_limits; + else + dev_info(&ips->dev->dev, "No CPUID match found.\n"); + + rdmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_power); + tdp = turbo_power & TURBO_TDP_MASK; + + /* Sanity check TDP against CPU */ + if (limits->mcp_power_limit != (tdp / 8) * 1000) { + dev_warn(&ips->dev->dev, "Warning: CPU TDP doesn't match expected value (found %d, expected %d)\n", + tdp / 8, limits->mcp_power_limit / 1000); + } + +out: + return limits; +} + +/** + * ips_get_i915_syms - try to get GPU control methods from i915 driver + * @ips: IPS driver + * + * The i915 driver exports several interfaces to allow the IPS driver to + * monitor and control graphics turbo mode. If we can find them, we can + * enable graphics turbo, otherwise we must disable it to avoid exceeding + * thermal and power limits in the MCP. + */ +static bool ips_get_i915_syms(struct ips_driver *ips) +{ + ips->read_mch_val = symbol_get(i915_read_mch_val); + if (!ips->read_mch_val) + goto out_err; + ips->gpu_raise = symbol_get(i915_gpu_raise); + if (!ips->gpu_raise) + goto out_put_mch; + ips->gpu_lower = symbol_get(i915_gpu_lower); + if (!ips->gpu_lower) + goto out_put_raise; + ips->gpu_busy = symbol_get(i915_gpu_busy); + if (!ips->gpu_busy) + goto out_put_lower; + ips->gpu_turbo_disable = symbol_get(i915_gpu_turbo_disable); + if (!ips->gpu_turbo_disable) + goto out_put_busy; + + return true; + +out_put_busy: + symbol_put(i915_gpu_turbo_disable); +out_put_lower: + symbol_put(i915_gpu_lower); +out_put_raise: + symbol_put(i915_gpu_raise); +out_put_mch: + symbol_put(i915_read_mch_val); +out_err: + return false; +} + +static DEFINE_PCI_DEVICE_TABLE(ips_id_table) = { + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, + PCI_DEVICE_ID_INTEL_THERMAL_SENSOR), }, + { 0, } +}; + +MODULE_DEVICE_TABLE(pci, ips_id_table); + +static int ips_probe(struct pci_dev *dev, const struct pci_device_id *id) +{ + u64 platform_info; + struct ips_driver *ips; + u32 hts; + int ret = 0; + u16 htshi, trc, trc_required_mask; + u8 tse; + + ips = kzalloc(sizeof(struct ips_driver), GFP_KERNEL); + if (!ips) + return -ENOMEM; + + pci_set_drvdata(dev, ips); + ips->dev = dev; + + ips->limits = ips_detect_cpu(ips); + if (!ips->limits) { + dev_info(&dev->dev, "IPS not supported on this CPU\n"); + ret = -ENXIO; + goto error_free; + } + + spin_lock_init(&ips->turbo_status_lock); + + if (!pci_resource_start(dev, 0)) { + dev_err(&dev->dev, "TBAR not assigned, aborting\n"); + ret = -ENXIO; + goto error_free; + } + + ret = pci_request_regions(dev, "ips thermal sensor"); + if (ret) { + dev_err(&dev->dev, "thermal resource busy, aborting\n"); + goto error_free; + } + + ret = pci_enable_device(dev); + if (ret) { + dev_err(&dev->dev, "can't enable PCI device, aborting\n"); + goto error_free; + } + + ips->regmap = ioremap(pci_resource_start(dev, 0), + pci_resource_len(dev, 0)); + if (!ips->regmap) { + dev_err(&dev->dev, "failed to map thermal regs, aborting\n"); + ret = -EBUSY; + goto error_release; + } + + tse = thm_readb(THM_TSE); + if (tse != TSE_EN) { + dev_err(&dev->dev, "thermal device not enabled (0x%02x), aborting\n", tse); + ret = -ENXIO; + goto error_unmap; + } + + trc = thm_readw(THM_TRC); + trc_required_mask = TRC_CORE1_EN | TRC_CORE_PWR | TRC_MCH_EN; + if ((trc & trc_required_mask) != trc_required_mask) { + dev_err(&dev->dev, "thermal reporting for required devices not enabled, aborting\n"); + ret = -ENXIO; + goto error_unmap; + } + + if (trc & TRC_CORE2_EN) + ips->second_cpu = true; + + update_turbo_limits(ips); + dev_dbg(&dev->dev, "max cpu power clamp: %dW\n", + ips->mcp_power_limit / 10); + dev_dbg(&dev->dev, "max core power clamp: %dW\n", + ips->core_power_limit / 10); + /* BIOS may update limits at runtime */ + if (thm_readl(THM_PSC) & PSP_PBRT) + ips->poll_turbo_status = true; + + if (!ips_get_i915_syms(ips)) { + dev_err(&dev->dev, "failed to get i915 symbols, graphics turbo disabled\n"); + ips->gpu_turbo_enabled = false; + } else { + dev_dbg(&dev->dev, "graphics turbo enabled\n"); + ips->gpu_turbo_enabled = true; + } + + /* + * Check PLATFORM_INFO MSR to make sure this chip is + * turbo capable. + */ + rdmsrl(PLATFORM_INFO, platform_info); + if (!(platform_info & PLATFORM_TDP)) { + dev_err(&dev->dev, "platform indicates TDP override unavailable, aborting\n"); + ret = -ENODEV; + goto error_unmap; + } + + /* + * IRQ handler for ME interaction + * Note: don't use MSI here as the PCH has bugs. + */ + pci_disable_msi(dev); + ret = request_irq(dev->irq, ips_irq_handler, IRQF_SHARED, "ips", + ips); + if (ret) { + dev_err(&dev->dev, "request irq failed, aborting\n"); + goto error_unmap; + } + + /* Enable aux, hot & critical interrupts */ + thm_writeb(THM_TSPIEN, TSPIEN_AUX2_LOHI | TSPIEN_CRIT_LOHI | + TSPIEN_HOT_LOHI | TSPIEN_AUX_LOHI); + thm_writeb(THM_TEN, TEN_UPDATE_EN); + + /* Collect adjustment values */ + ips->cta_val = thm_readw(THM_CTA); + ips->pta_val = thm_readw(THM_PTA); + ips->mgta_val = thm_readw(THM_MGTA); + + /* Save turbo limits & ratios */ + rdmsrl(TURBO_POWER_CURRENT_LIMIT, ips->orig_turbo_limit); + + ips_enable_cpu_turbo(ips); + ips->cpu_turbo_enabled = true; + + /* Set up the work queue and monitor/adjust threads */ + ips->monitor = kthread_run(ips_monitor, ips, "ips-monitor"); + if (IS_ERR(ips->monitor)) { + dev_err(&dev->dev, + "failed to create thermal monitor thread, aborting\n"); + ret = -ENOMEM; + goto error_free_irq; + } + + ips->adjust = kthread_create(ips_adjust, ips, "ips-adjust"); + if (IS_ERR(ips->adjust)) { + dev_err(&dev->dev, + "failed to create thermal adjust thread, aborting\n"); + ret = -ENOMEM; + goto error_thread_cleanup; + } + + hts = (ips->core_power_limit << HTS_PCPL_SHIFT) | + (ips->mcp_temp_limit << HTS_PTL_SHIFT) | HTS_NVV; + htshi = HTS2_PRST_RUNNING << HTS2_PRST_SHIFT; + + thm_writew(THM_HTSHI, htshi); + thm_writel(THM_HTS, hts); + + ips_debugfs_init(ips); + + dev_info(&dev->dev, "IPS driver initialized, MCP temp limit %d\n", + ips->mcp_temp_limit); + return ret; + +error_thread_cleanup: + kthread_stop(ips->monitor); +error_free_irq: + free_irq(ips->dev->irq, ips); +error_unmap: + iounmap(ips->regmap); +error_release: + pci_release_regions(dev); +error_free: + kfree(ips); + return ret; +} + +static void ips_remove(struct pci_dev *dev) +{ + struct ips_driver *ips = pci_get_drvdata(dev); + u64 turbo_override; + + if (!ips) + return; + + ips_debugfs_cleanup(ips); + + /* Release i915 driver */ + if (ips->read_mch_val) + symbol_put(i915_read_mch_val); + if (ips->gpu_raise) + symbol_put(i915_gpu_raise); + if (ips->gpu_lower) + symbol_put(i915_gpu_lower); + if (ips->gpu_busy) + symbol_put(i915_gpu_busy); + if (ips->gpu_turbo_disable) + symbol_put(i915_gpu_turbo_disable); + + rdmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_override); + turbo_override &= ~(TURBO_TDC_OVR_EN | TURBO_TDP_OVR_EN); + wrmsrl(TURBO_POWER_CURRENT_LIMIT, turbo_override); + wrmsrl(TURBO_POWER_CURRENT_LIMIT, ips->orig_turbo_limit); + + free_irq(ips->dev->irq, ips); + if (ips->adjust) + kthread_stop(ips->adjust); + if (ips->monitor) + kthread_stop(ips->monitor); + iounmap(ips->regmap); + pci_release_regions(dev); + kfree(ips); + dev_dbg(&dev->dev, "IPS driver removed\n"); +} + +#ifdef CONFIG_PM +static int ips_suspend(struct pci_dev *dev, pm_message_t state) +{ + return 0; +} + +static int ips_resume(struct pci_dev *dev) +{ + return 0; +} +#else +#define ips_suspend NULL +#define ips_resume NULL +#endif /* CONFIG_PM */ + +static void ips_shutdown(struct pci_dev *dev) +{ +} + +static struct pci_driver ips_pci_driver = { + .name = "intel ips", + .id_table = ips_id_table, + .probe = ips_probe, + .remove = ips_remove, + .suspend = ips_suspend, + .resume = ips_resume, + .shutdown = ips_shutdown, +}; + +static int __init ips_init(void) +{ + return pci_register_driver(&ips_pci_driver); +} +module_init(ips_init); + +static void ips_exit(void) +{ + pci_unregister_driver(&ips_pci_driver); + return; +} +module_exit(ips_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Jesse Barnes <jbarnes@virtuousgeek.org>"); +MODULE_DESCRIPTION("Intelligent Power Sharing Driver"); |