--- /dev/null
+/*
+ * 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)
+{
+ return false;
+}
+
+/**
+ * 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_warn(&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)
+ ret = true;
+ spin_unlock_irqrestore(&ips->turbo_status_lock, flags);
+
+ if (ret)
+ dev_warn(&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;
+ 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 ret;
+}
+
+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 = NULL, *mchp_samples = NULL, old_cpu_power;
+ u16 *mcp_samples = NULL, *ctv1_samples = NULL, *ctv2_samples = NULL,
+ *mch_samples = NULL;
+ 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) {
+ 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);
+ 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;
+
+ 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;
+ }
+
+ 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;
+
+ /*
+ * 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");
projects / users / hch / xfs.git / commitdiff