From patchwork Thu Mar 25 19:52:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Stimson, Dale B" X-Patchwork-Id: 12164967 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C9B14C433C1 for ; Thu, 25 Mar 2021 19:52:42 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 82CA561A1E for ; Thu, 25 Mar 2021 19:52:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 82CA561A1E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 032076EE18; Thu, 25 Mar 2021 19:52:42 +0000 (UTC) Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTPS id E7A166EE12 for ; Thu, 25 Mar 2021 19:52:40 +0000 (UTC) IronPort-SDR: 3ADOCzI0sAl2AkvY58Qqd9YLUk7UIjSy4me3ZEmsBzwz664GZDxPz4VFHHd0LDFk45G5Hmp9pY krODcwXwTQqw== X-IronPort-AV: E=McAfee;i="6000,8403,9934"; a="211147805" X-IronPort-AV: E=Sophos;i="5.81,278,1610438400"; d="scan'208";a="211147805" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Mar 2021 12:52:38 -0700 IronPort-SDR: bsAt3sKQ36tqK3NAfZcheKy0R4+7NqN1/sFmp5Zr1fykxZ7wfpUGRloLPUWicTWgE5oz1QTI8b AGB2WbsH/AGg== X-IronPort-AV: E=Sophos;i="5.81,278,1610438400"; d="scan'208";a="376979977" Received: from dbstims-dev.fm.intel.com ([10.1.27.177]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Mar 2021 12:52:38 -0700 From: Dale B Stimson To: intel-gfx@lists.freedesktop.org Date: Thu, 25 Mar 2021 12:52:30 -0700 Message-Id: <20210325195230.97238-1-dale.b.stimson@intel.com> X-Mailer: git-send-email 2.31.0 MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH] drm/i915/dg1: Add HWMON power sensor support X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" As part of the System Managemenent Interface (SMI), use the HWMON subsystem to display power utilization. The following standard HWMON power sensors are currently supported (and appropriately scaled): /sys/class/drm/card0/device/hwmon/hwmon - energy1_input - power1_cap - power1_max Some non-standard HWMON power information is also provided, such as enable bits and intervals. Signed-off-by: Dale B Stimson Reported-by: kernel test robot Reported-by: kernel test robot Reported-by: kernel test robot --- drivers/gpu/drm/i915/Kconfig | 1 + drivers/gpu/drm/i915/Makefile | 1 + drivers/gpu/drm/i915/i915_drv.c | 8 + drivers/gpu/drm/i915/i915_drv.h | 3 + drivers/gpu/drm/i915/i915_hwmon.c | 785 ++++++++++++++++++++++++++++++ drivers/gpu/drm/i915/i915_hwmon.h | 41 ++ drivers/gpu/drm/i915/i915_reg.h | 53 ++ 7 files changed, 892 insertions(+) create mode 100644 drivers/gpu/drm/i915/i915_hwmon.c create mode 100644 drivers/gpu/drm/i915/i915_hwmon.h diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig index 1e1cb245fca77..ec8d5a0d7ea96 100644 --- a/drivers/gpu/drm/i915/Kconfig +++ b/drivers/gpu/drm/i915/Kconfig @@ -14,6 +14,7 @@ config DRM_I915 select DRM_MIPI_DSI select RELAY select IRQ_WORK + select HWMON # i915 depends on ACPI_VIDEO when ACPI is enabled # but for select to work, need to select ACPI_VIDEO's dependencies, ick select BACKLIGHT_CLASS_DEVICE if ACPI diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 14f1ab399ad08..1c110d306e493 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -37,6 +37,7 @@ i915-y += i915_drv.o \ i915_config.o \ i915_irq.o \ i915_getparam.o \ + i915_hwmon.o \ i915_mitigations.o \ i915_params.o \ i915_pci.o \ diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index b2018e85afc2d..958517e5157b4 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -69,6 +69,7 @@ #include "i915_debugfs.h" #include "i915_drv.h" +#include "i915_hwmon.h" #include "i915_ioc32.h" #include "i915_irq.h" #include "i915_memcpy.h" @@ -671,6 +672,10 @@ static void i915_driver_register(struct drm_i915_private *dev_priv) return; } + /* Register with hwmon */ + if (i915_hwmon_init(&dev_priv->drm)) + drm_err(&dev_priv->drm, "Failed to register driver hwmon!\n"); + i915_debugfs_register(dev_priv); i915_setup_sysfs(dev_priv); @@ -711,6 +716,9 @@ static void i915_driver_unregister(struct drm_i915_private *dev_priv) i915_pmu_unregister(dev_priv); i915_teardown_sysfs(dev_priv); + + i915_hwmon_fini(&dev_priv->drm); + drm_dev_unplug(&dev_priv->drm); i915_gem_driver_unregister(dev_priv); diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index fa596dace4902..7998461e2f00c 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -61,6 +61,7 @@ #include #include +#include "i915_hwmon.h" #include "i915_params.h" #include "i915_reg.h" #include "i915_utils.h" @@ -1108,6 +1109,8 @@ struct drm_i915_private { struct i915_perf perf; + struct i915_hwmon hwmon; + /* Abstract the submission mechanism (legacy ringbuffer or execlists) away */ struct intel_gt gt; diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c new file mode 100644 index 0000000000000..373bb937a373d --- /dev/null +++ b/drivers/gpu/drm/i915/i915_hwmon.c @@ -0,0 +1,785 @@ +// SPDX-License-Identifier: MIT + +/* + * Copyright © 2020 Intel Corporation + */ + +/* + * Power-related hwmon entries. + */ + +#include +#include + +#include "i915_drv.h" +#include "gt/intel_gt.h" +#include "i915_hwmon.h" + +/** + * SF_* - scale factors for particular quantities. + * The hwmon standard says that quantities of the given types are specified + * in the given units: + * - time - milliseconds + * - power - microwatts + * - energy - microjoules + */ + +#define SF_TIME 1000 +#define SF_POWER 1000000 +#define SF_ENERGY 1000000 + +static void +_locked_with_pm_intel_uncore_rmw(struct intel_uncore *uncore, + i915_reg_t reg, u32 clear, u32 set) +{ + struct drm_i915_private *i915 = uncore->i915; + struct i915_hwmon *hwmon = &i915->hwmon; + intel_wakeref_t wakeref; + + mutex_lock(&hwmon->hwmon_lock); + + with_intel_runtime_pm(uncore->rpm, wakeref) + intel_uncore_rmw(uncore, reg, clear, set); + + mutex_unlock(&hwmon->hwmon_lock); +} + +/* + * _field_read_and_scale() + * Return type of u64 allows for the case where the scaling might cause a + * result exceeding 32 bits. + */ +static __always_inline u64 +_field_read_and_scale(struct intel_uncore *uncore, i915_reg_t rgadr, + u32 field_mask, int nshift, unsigned int scale_factor) +{ + intel_wakeref_t wakeref; + u32 reg_value; + u64 scaled_val; + + with_intel_runtime_pm(uncore->rpm, wakeref) + reg_value = intel_uncore_read(uncore, rgadr); + + reg_value = le32_get_bits(reg_value, field_mask); + scaled_val = mul_u32_u32(scale_factor, reg_value); + + /* Shift, rounding to nearest */ + if (nshift > 0) + scaled_val = (scaled_val + (1 << (nshift - 1))) >> nshift; + + return scaled_val; +} + +/* + * _field_read64_and_scale() - read a 64-bit register and scale. + */ +static __always_inline u64 +_field_read64_and_scale(struct intel_uncore *uncore, i915_reg_t rgadr, + u64 field_mask, int nshift, unsigned int scale_factor) +{ + intel_wakeref_t wakeref; + u64 reg_value; + u64 scaled_val; + + with_intel_runtime_pm(uncore->rpm, wakeref) + reg_value = intel_uncore_read64(uncore, rgadr); + + reg_value = le64_get_bits(reg_value, field_mask); + scaled_val = scale_factor * reg_value; + + /* Shift, rounding to nearest */ + if (nshift > 0) + scaled_val = (scaled_val + (1 << (nshift - 1))) >> nshift; + + return scaled_val; +} + +/* + * _field_scale_and_write() + */ +static __always_inline void +_field_scale_and_write(struct intel_uncore *uncore, + i915_reg_t rgadr, + u32 field_mask, int nshift, + unsigned int scale_factor, long lval) +{ + u32 nval; + u32 bits_to_clear; + u32 bits_to_set; + + /* Computation in 64-bits to avoid overflow. Round to nearest. */ + nval = DIV_ROUND_CLOSEST_ULL((u64)lval << nshift, scale_factor); + + bits_to_clear = field_mask; + bits_to_set = le32_encode_bits(nval, field_mask); + + _locked_with_pm_intel_uncore_rmw(uncore, rgadr, + bits_to_clear, bits_to_set); +} + +/* + * i915_energy1_input_show - A custom function to obtain energy1_input. + * Use a custom function instead of the usual hwmon helpers in order to + * guarantee 64-bits of result to user-space. + * Units are microjoules. + * + * The underlying hardware register is 32-bits and is subject to overflow. + * This function compensates for overflow of the 32-bit register by detecting + * wrap-around and incrementing an overflow counter. + * This only works if the register is sampled often enough to avoid + * missing an instance of overflow - achieved either by repeated + * queries through the API, or via a possible timer (future - TBD) that + * ensures values are read often enough to catch all overflows. + * + * How long before overflow? For example, with an example scaling bit + * shift of 14 bits (see register *PACKAGE_POWER_SKU_UNIT) and a power draw of + * 1000 watts, the 32-bit counter will overflow in approximately 4.36 minutes. + * + * Examples: + * 1 watt: (2^32 >> 14) / 1 W / (60 * 60 * 24) secs/day -> 3 days + * 1000 watts: (2^32 >> 14) / 1000 W / 60 secs/min -> 4.36 minutes + */ +static ssize_t +i915_energy1_input_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct drm_i915_private *i915 = dev_get_drvdata(dev); + struct intel_uncore *uncore = &i915->uncore; + struct i915_hwmon *hwmon = &i915->hwmon; + int nshift = hwmon->scl_shift_energy; + ssize_t ret; + intel_wakeref_t wakeref; + u32 reg_value; + u64 vlo; + u64 vhi; + + mutex_lock(&hwmon->hwmon_lock); + + with_intel_runtime_pm(uncore->rpm, wakeref) + reg_value = intel_uncore_read(uncore, + hwmon->rg.reg_energy_status); + + /* + * The u32 register concatenated with the u32 overflow counter + * gives an effective energy counter size of 64-bits. However, the + * computations below are done modulo 2^96 to avoid overflow during + * scaling in the conversion to microjoules. + * + * The low-order 64-bits of the resulting quantity are returned to + * the caller in units of microjoules, encoded into a decimal string. + * + * For a power of 1000 watts, 64 bits in units of microjoules will + * overflow after 584 years. + */ + + if (hwmon->energy_counter_prev > reg_value) + hwmon->energy_counter_overflow++; + + hwmon->energy_counter_prev = reg_value; + + /* + * 64-bit variables vlo and vhi are used for the scaling process. + * The 96-bit counter value is composed from the two 64-bit variables + * vhi and vlo thusly: counter == vhi << 32 + vlo . + * The 32-bits of overlap between the two variables is convenient for + * handling overflows out of vlo. + */ + + vlo = reg_value; + vhi = hwmon->energy_counter_overflow; + + mutex_unlock(&hwmon->hwmon_lock); + + vlo = SF_ENERGY * vlo; + + /* Prepare to round to nearest */ + if (nshift > 0) + vlo += 1 << (nshift - 1); + + /* + * Anything in the upper-32 bits of vlo gets added into vhi here, + * and then cleared from vlo. + */ + vhi = (SF_ENERGY * vhi) + (vlo >> 32); + vlo &= 0xffffffffULL; + + /* + * Apply the right shift. + * - vlo shifted by itself. + * - vlo receiving what's shifted out of vhi. + * - vhi shifted by itself + */ + vlo = vlo >> nshift; + vlo |= (vhi << (32 - nshift)) & 0xffffffffULL; + vhi = vhi >> nshift; + + /* Combined to get a 64-bit result in vlo. */ + vlo |= (vhi << 32); + + ret = scnprintf(buf, PAGE_SIZE, "%llu\n", vlo); + + return ret; +} + +static ssize_t +i915_power1_max_enable_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct drm_i915_private *i915 = dev_get_drvdata(dev); + struct intel_uncore *uncore = &i915->uncore; + intel_wakeref_t wakeref; + ssize_t ret; + u32 reg_value; + bool is_enabled; + + with_intel_runtime_pm(uncore->rpm, wakeref) + reg_value = intel_uncore_read(uncore, + i915->hwmon.rg.pkg_rapl_limit); + + is_enabled = !!(reg_value & PKG_PWR_LIM_1_EN); + + ret = scnprintf(buf, PAGE_SIZE, "%u\n", is_enabled); + + return ret; +} + +static ssize_t +i915_power1_max_enable_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct drm_i915_private *i915 = dev_get_drvdata(dev); + struct intel_uncore *uncore = &i915->uncore; + struct i915_hwmon *hwmon = &i915->hwmon; + ssize_t ret; + u32 val; + u32 bits_to_clear; + u32 bits_to_set; + + ret = kstrtou32(buf, 0, &val); + if (ret) + return ret; + + bits_to_clear = PKG_PWR_LIM_1_EN; + if (!val) + bits_to_set = 0; + else + bits_to_set = PKG_PWR_LIM_1_EN; + + _locked_with_pm_intel_uncore_rmw(uncore, hwmon->rg.pkg_rapl_limit, + bits_to_clear, bits_to_set); + + return count; +} + +static ssize_t +i915_power1_max_interval_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct drm_i915_private *i915 = dev_get_drvdata(dev); + struct intel_uncore *uncore = &i915->uncore; + struct i915_hwmon *hwmon = &i915->hwmon; + ssize_t ret; + u64 ullval; + + ullval = _field_read_and_scale(uncore, hwmon->rg.pkg_rapl_limit, + PKG_PWR_LIM_1_TIME, + hwmon->scl_shift_time, SF_TIME); + + ret = scnprintf(buf, PAGE_SIZE, "%llu\n", ullval); + + return ret; +} + +static ssize_t +i915_power1_max_interval_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct drm_i915_private *i915 = dev_get_drvdata(dev); + struct intel_uncore *uncore = &i915->uncore; + struct i915_hwmon *hwmon = &i915->hwmon; + ssize_t ret; + long val; + + ret = kstrtoul(buf, 0, &val); + if (ret) + return ret; + + _field_scale_and_write(uncore, hwmon->rg.pkg_rapl_limit, + PKG_PWR_LIM_2_TIME, + hwmon->scl_shift_time, SF_TIME, val); + + return count; +} + +static ssize_t +i915_power1_cap_enable_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct drm_i915_private *i915 = dev_get_drvdata(dev); + struct intel_uncore *uncore = &i915->uncore; + struct i915_hwmon *hwmon = &i915->hwmon; + intel_wakeref_t wakeref; + ssize_t ret; + u32 reg_value; + bool is_enabled; + + with_intel_runtime_pm(uncore->rpm, wakeref) + reg_value = intel_uncore_read(uncore, + hwmon->rg.pkg_rapl_limit_udw); + + is_enabled = !!(reg_value & PKG_PWR_LIM_2_EN); + + ret = scnprintf(buf, PAGE_SIZE, "%u\n", is_enabled); + + return ret; +} + +static ssize_t +i915_power1_cap_enable_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct drm_i915_private *i915 = dev_get_drvdata(dev); + struct intel_uncore *uncore = &i915->uncore; + struct i915_hwmon *hwmon = &i915->hwmon; + ssize_t ret; + u32 val; + u32 bits_to_clear; + u32 bits_to_set; + + ret = kstrtou32(buf, 0, &val); + if (ret) + return ret; + + bits_to_clear = PKG_PWR_LIM_2_EN; + if (!val) + bits_to_set = 0; + else + bits_to_set = PKG_PWR_LIM_2_EN; + + _locked_with_pm_intel_uncore_rmw(uncore, hwmon->rg.pkg_rapl_limit_udw, + bits_to_clear, bits_to_set); + + return count; +} + +static ssize_t +i915_power_default_limit_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct drm_i915_private *i915 = dev_get_drvdata(dev); + struct i915_hwmon *hwmon = &i915->hwmon; + ssize_t ret; + + ret = scnprintf(buf, PAGE_SIZE, "%u\n", hwmon->power_max_initial_value); + + return ret; +} + +static ssize_t +i915_power_min_limit_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct drm_i915_private *i915 = dev_get_drvdata(dev); + struct intel_uncore *uncore = &i915->uncore; + struct i915_hwmon *hwmon = &i915->hwmon; + ssize_t ret; + u32 uval; + + /* + * This is a 64-bit register but the individual fields are under 32 bits + * in size even after scaling. + * The UAPI specifies a size of 32 bits. + * The UAPI specifies that 0 should be returned if unsupported. + * So, using u32 and %u is sufficient. + */ + if (i915_mmio_reg_valid(hwmon->rg.pkg_power_sku)) + uval = (u32)_field_read64_and_scale(uncore, + hwmon->rg.pkg_power_sku, + PKG_MIN_PWR, + hwmon->scl_shift_power, + SF_POWER); + else + uval = 0; + + ret = scnprintf(buf, PAGE_SIZE, "%u\n", uval); + + return ret; +} + +static ssize_t +i915_power_max_limit_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct drm_i915_private *i915 = dev_get_drvdata(dev); + struct intel_uncore *uncore = &i915->uncore; + struct i915_hwmon *hwmon = &i915->hwmon; + ssize_t ret; + u32 uval; + + /* + * This is a 64-bit register but the individual fields are under 32 bits + * in size even after scaling. + * The UAPI specifies a size of 32 bits. + * The UAPI specifies that UINT_MAX should be returned if unsupported. + * So, using u32 and %u is sufficient. + */ + if (i915_mmio_reg_valid(hwmon->rg.pkg_power_sku)) + uval = (u32)_field_read64_and_scale(uncore, + hwmon->rg.pkg_power_sku, + PKG_MAX_PWR, + hwmon->scl_shift_power, + SF_POWER); + else + uval = UINT_MAX; + + ret = scnprintf(buf, PAGE_SIZE, "%u\n", uval); + + return ret; +} + +static SENSOR_DEVICE_ATTR(power1_max_enable, 0664, + i915_power1_max_enable_show, + i915_power1_max_enable_store, 0); +static SENSOR_DEVICE_ATTR(power1_max_interval, 0664, + i915_power1_max_interval_show, + i915_power1_max_interval_store, 0); +static SENSOR_DEVICE_ATTR(power1_cap_enable, 0664, + i915_power1_cap_enable_show, + i915_power1_cap_enable_store, 0); +static SENSOR_DEVICE_ATTR(power_default_limit, 0444, + i915_power_default_limit_show, NULL, 0); +static SENSOR_DEVICE_ATTR(power_min_limit, 0444, + i915_power_min_limit_show, NULL, 0); +static SENSOR_DEVICE_ATTR(power_max_limit, 0444, + i915_power_max_limit_show, NULL, 0); +static SENSOR_DEVICE_ATTR(energy1_input, 0444, + i915_energy1_input_show, NULL, 0); + +static struct attribute *hwmon_attributes[] = { + &sensor_dev_attr_power1_max_enable.dev_attr.attr, + &sensor_dev_attr_power1_max_interval.dev_attr.attr, + &sensor_dev_attr_power1_cap_enable.dev_attr.attr, + &sensor_dev_attr_power_default_limit.dev_attr.attr, + &sensor_dev_attr_power_min_limit.dev_attr.attr, + &sensor_dev_attr_power_max_limit.dev_attr.attr, + &sensor_dev_attr_energy1_input.dev_attr.attr, + NULL +}; + +static umode_t hwmon_attributes_visible(struct kobject *kobj, + struct attribute *attr, int index) +{ + struct device *dev = kobj_to_dev(kobj); + struct drm_i915_private *i915 = dev_get_drvdata(dev); + struct i915_hwmon *hwmon = &i915->hwmon; + i915_reg_t rgadr; + + if (attr == &sensor_dev_attr_energy1_input.dev_attr.attr) + rgadr = hwmon->rg.reg_energy_status; + else if (attr == &sensor_dev_attr_power1_max_enable.dev_attr.attr) + rgadr = hwmon->rg.pkg_rapl_limit; + else if (attr == &sensor_dev_attr_power1_max_interval.dev_attr.attr) + rgadr = hwmon->rg.pkg_rapl_limit; + else if (attr == &sensor_dev_attr_power1_cap_enable.dev_attr.attr) + rgadr = hwmon->rg.pkg_rapl_limit_udw; + else if (attr == &sensor_dev_attr_power_default_limit.dev_attr.attr) + rgadr = hwmon->rg.pkg_rapl_limit; + else if (attr == &sensor_dev_attr_power_min_limit.dev_attr.attr) + return attr->mode; + else if (attr == &sensor_dev_attr_power_max_limit.dev_attr.attr) + return attr->mode; + else + return 0; + + if (!i915_mmio_reg_valid(rgadr)) + return 0; + + return attr->mode; +} + +static const struct attribute_group hwmon_attrgroup = { + .attrs = hwmon_attributes, + .is_visible = hwmon_attributes_visible, +}; + +static const struct attribute_group *hwmon_groups[] = { + &hwmon_attrgroup, + NULL +}; + +/* + * HWMON SENSOR TYPE = hwmon_power + * - Sustained Power (power1_max) + * - Burst power (power1_cap) + * - Peak power (power1_crit) + */ +static const u32 i915_config_power[] = { + HWMON_P_CAP | HWMON_P_MAX, + 0 +}; + +static const struct hwmon_channel_info i915_power = { + .type = hwmon_power, + .config = i915_config_power, +}; + +static const struct hwmon_channel_info *i915_info[] = { + &i915_power, + NULL +}; + +static umode_t +i915_power_is_visible(const struct drm_i915_private *i915, u32 attr, int chan) +{ + i915_reg_t rgadr; + + switch (attr) { + case hwmon_power_max: + rgadr = i915->hwmon.rg.pkg_rapl_limit; + break; + case hwmon_power_cap: + rgadr = i915->hwmon.rg.pkg_rapl_limit_udw; + break; + default: + return 0; + } + + if (!i915_mmio_reg_valid(rgadr)) + return 0; + + return 0664; +} + +static int +i915_power_read(struct drm_i915_private *i915, u32 attr, int chan, long *val) +{ + struct intel_uncore *uncore = &i915->uncore; + struct i915_hwmon *hwmon = &i915->hwmon; + int ret = 0; + + switch (attr) { + case hwmon_power_max: + *val = (long)_field_read_and_scale(uncore, + hwmon->rg.pkg_rapl_limit, + PKG_PWR_LIM_1, + hwmon->scl_shift_power, + SF_POWER); + break; + case hwmon_power_cap: + *val = (long)_field_read_and_scale(uncore, + hwmon->rg.pkg_rapl_limit_udw, + PKG_PWR_LIM_2, + hwmon->scl_shift_power, + SF_POWER); + break; + default: + ret = -EOPNOTSUPP; + } + + return ret; +} + +static int +i915_power_write(struct drm_i915_private *i915, u32 attr, int chan, long val) +{ + struct intel_uncore *uncore = &i915->uncore; + struct i915_hwmon *hwmon = &i915->hwmon; + int ret = 0; + + switch (attr) { + case hwmon_power_max: + _field_scale_and_write(uncore, + hwmon->rg.pkg_rapl_limit, + PKG_PWR_LIM_1, + hwmon->scl_shift_power, + SF_POWER, val); + break; + case hwmon_power_cap: + _field_scale_and_write(uncore, + hwmon->rg.pkg_rapl_limit_udw, + PKG_PWR_LIM_2, + hwmon->scl_shift_power, + SF_POWER, val); + break; + default: + ret = -EOPNOTSUPP; + } + + return ret; +} + +static umode_t +i915_is_visible(const void *data, enum hwmon_sensor_types type, + u32 attr, int channel) +{ + struct drm_i915_private *i915 = (struct drm_i915_private *)data; + + switch (type) { + case hwmon_power: + return i915_power_is_visible(i915, attr, channel); + default: + return 0; + } +} + +static int +i915_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, + int channel, long *val) +{ + struct drm_i915_private *i915 = kdev_to_i915(dev); + + switch (type) { + case hwmon_power: + return i915_power_read(i915, attr, channel, val); + default: + return -EOPNOTSUPP; + } +} + +static int +i915_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, + int channel, long val) +{ + struct drm_i915_private *i915 = kdev_to_i915(dev); + + switch (type) { + case hwmon_power: + return i915_power_write(i915, attr, channel, val); + default: + return -EOPNOTSUPP; + } +} + +static const struct hwmon_ops i915_hwmon_ops = { + .is_visible = i915_is_visible, + .read = i915_read, + .write = i915_write, +}; + +static const struct hwmon_chip_info i915_chip_info = { + .ops = &i915_hwmon_ops, + .info = i915_info, +}; + +static void +i915_hwmon_get_preregistration_info(struct drm_i915_private *i915) +{ + struct i915_hwmon *hwmon = &i915->hwmon; + struct intel_uncore *uncore = &i915->uncore; + intel_wakeref_t wakeref; + u32 val_sku_unit; + + if (IS_DG1(i915)) { + hwmon->rg.pkg_power_sku_unit = PCU_PACKAGE_POWER_SKU_UNIT; + hwmon->rg.pkg_power_sku = PCU_PACKAGE_POWER_SKU; + hwmon->rg.pkg_energy_status = PCU_PACKAGE_ENERGY_STATUS; + hwmon->rg.pkg_rapl_limit = PCU_PACKAGE_RAPL_LIMIT; + hwmon->rg.pkg_rapl_limit_udw = PCU_PACKAGE_RAPL_LIMIT_UDW; + hwmon->rg.plt_energy_status = PCU_PLATFORM_ENERGY_STATUS; + } else { + hwmon->rg.pkg_power_sku_unit = INVALID_MMIO_REG; + hwmon->rg.pkg_power_sku = INVALID_MMIO_REG; + hwmon->rg.pkg_energy_status = INVALID_MMIO_REG; + hwmon->rg.pkg_rapl_limit = INVALID_MMIO_REG; + hwmon->rg.pkg_rapl_limit_udw = INVALID_MMIO_REG; + hwmon->rg.plt_energy_status = INVALID_MMIO_REG; + } + + /* + * If a platform does not support *_PLATFORM_ENERGY_STATUS, + * try *PACKAGE_ENERGY_STATUS. + */ + if (i915_mmio_reg_valid(hwmon->rg.plt_energy_status)) + hwmon->rg.reg_energy_status = hwmon->rg.plt_energy_status; + else + hwmon->rg.reg_energy_status = hwmon->rg.pkg_energy_status; + + wakeref = intel_runtime_pm_get(uncore->rpm); + + /* + * The contents of register hwmon->rg.pkg_power_sku_unit do not change, + * so read it once and store the shift values. + */ + if (i915_mmio_reg_valid(hwmon->rg.pkg_power_sku_unit)) + val_sku_unit = intel_uncore_read(uncore, + hwmon->rg.pkg_power_sku_unit); + else + val_sku_unit = 0; + + hwmon->energy_counter_overflow = 0; + + if (i915_mmio_reg_valid(hwmon->rg.reg_energy_status)) + hwmon->energy_counter_prev = + intel_uncore_read(uncore, hwmon->rg.reg_energy_status); + else + hwmon->energy_counter_prev = 0; + + intel_runtime_pm_put(uncore->rpm, wakeref); + + hwmon->scl_shift_power = le32_get_bits(val_sku_unit, PKG_PWR_UNIT); + hwmon->scl_shift_energy = le32_get_bits(val_sku_unit, PKG_ENERGY_UNIT); + hwmon->scl_shift_time = le32_get_bits(val_sku_unit, PKG_TIME_UNIT); + + /* + * There is no direct way to obtain the power default_limit. + * The best known workaround is to use the initial value of power1_max. + * + * The value of power1_max is reset to the default on reboot, but is + * not reset by a module unload/load sequence. To allow proper + * functioning after a module reload, the value for power1_max is + * restored to its original value at module unload time in + * i915_hwmon_fini(). + */ + hwmon->power_max_initial_value = + (u32)_field_read_and_scale(uncore, + hwmon->rg.pkg_rapl_limit, + PKG_PWR_LIM_1, + hwmon->scl_shift_power, SF_POWER); +} + +int i915_hwmon_init(struct drm_device *drm_dev) +{ + struct drm_i915_private *i915 = to_i915(drm_dev); + struct i915_hwmon *hwmon = &i915->hwmon; + struct device *hwmon_dev; + + mutex_init(&hwmon->hwmon_lock); + + i915_hwmon_get_preregistration_info(i915); + + hwmon_dev = hwmon_device_register_with_info(drm_dev->dev, "i915", + drm_dev, + &i915_chip_info, + hwmon_groups); + + if (IS_ERR(hwmon_dev)) { + mutex_destroy(&hwmon->hwmon_lock); + return PTR_ERR(hwmon_dev); + } + + hwmon->dev = hwmon_dev; + + return 0; +} + +void i915_hwmon_fini(struct drm_device *drm_dev) +{ + struct drm_i915_private *i915 = to_i915(drm_dev); + struct i915_hwmon *hwmon = &i915->hwmon; + + if (hwmon->power_max_initial_value) { + /* Restore power1_max. */ + _field_scale_and_write(&i915->uncore, hwmon->rg.pkg_rapl_limit, + PKG_PWR_LIM_1, hwmon->scl_shift_power, + SF_POWER, + hwmon->power_max_initial_value); + } + + if (hwmon->dev) + hwmon_device_unregister(hwmon->dev); + + mutex_destroy(&hwmon->hwmon_lock); + + memset(hwmon, 0, sizeof(*hwmon)); +} diff --git a/drivers/gpu/drm/i915/i915_hwmon.h b/drivers/gpu/drm/i915/i915_hwmon.h new file mode 100644 index 0000000000000..0be919f0a463d --- /dev/null +++ b/drivers/gpu/drm/i915/i915_hwmon.h @@ -0,0 +1,41 @@ +/* SPDX-License-Identifier: MIT */ + +/* + * Copyright © 2020 Intel Corporation + */ + +#ifndef __INTEL_HWMON_H__ +#define __INTEL_HWMON_H__ + +#include +#include "i915_reg.h" + +struct i915_hwmon_reg { + i915_reg_t pkg_power_sku_unit; + i915_reg_t pkg_power_sku; + i915_reg_t pkg_energy_status; + i915_reg_t pkg_rapl_limit; + i915_reg_t pkg_rapl_limit_udw; + i915_reg_t plt_energy_status; + i915_reg_t reg_energy_status; +}; + +struct i915_hwmon { + struct device *dev; + struct mutex hwmon_lock; /* counter overflow logic and rmw */ + + struct i915_hwmon_reg rg; + + u32 energy_counter_overflow; + u32 energy_counter_prev; + u32 power_max_initial_value; + + int scl_shift_power; + int scl_shift_energy; + int scl_shift_time; +}; + +int i915_hwmon_init(struct drm_device *drm_dev); +void i915_hwmon_fini(struct drm_device *drm_dev); + +#endif diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index cbf7a60afe542..917e440478b5d 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -4068,6 +4068,59 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg) #define BXT_RP_STATE_CAP _MMIO(0x138170) #define GEN9_RP_STATE_LIMITS _MMIO(0x138148) +/* DG1 */ + +/* based on MCHBAR_MIRROR_BASE_SNB == 0x140000 */ +#define PCU_PACKAGE_POWER_SKU_UNIT _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5938) +#define PCU_PACKAGE_ENERGY_STATUS _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x593c) +#define PCU_PACKAGE_RAPL_LIMIT _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x59a0) +#define PCU_PACKAGE_RAPL_LIMIT_UDW _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x59a4) +#define PCU_PACKAGE_POWER_SKU INVALID_MMIO_REG +#define PCU_PLATFORM_ENERGY_STATUS INVALID_MMIO_REG + +/* Fields for *_PACKAGE_RAPL_LIMIT: */ +#define PKG_PWR_LIM_1 REG_GENMASK(14, 0) +#define PKG_PWR_LIM_1_EN REG_BIT(15) +#define PKG_PWR_LIM_1_TIME REG_GENMASK(23, 17) + +/* + * Fields for *_PACKAGE_RAPL_LIMIT_UDW: + * In docs, these fields may be defined relative to the entire 64-bit + * register, but here they are defined relative to the 32-bit boundary. + */ +#define PKG_PWR_LIM_2 REG_GENMASK(14, 0) // 46:32 +#define PKG_PWR_LIM_2_EN REG_BIT(15) // 47:47 +#define PKG_PWR_LIM_2_TIME REG_GENMASK(23, 17) // 55:49 + +/* + * *_PACKAGE_POWER_SKU_UNIT - fields specifying scaling for PCU quantities. + * - PKG_PWR_UNIT - Power Units used for power control registers. The + * actual unit value is calculated by 1 W / Power(2,PKG_PWR_UNIT). + * - PKG_ENERGY_UNIT - Energy Units used for power control registers. The + * actual unit value is calculated by 1 J / Power(2,PKG_ENERGY_UNIT). + * - PKG_TIME_UNIT - Time Units used for power control registers. The + * actual unit value is calculated by 1 s / Power(2,PKG_TIME_UNIT). + */ +#define PKG_PWR_UNIT REG_GENMASK(3, 0) +#define PKG_ENERGY_UNIT REG_GENMASK(12, 8) +#define PKG_TIME_UNIT REG_GENMASK(19, 16) + +/* + * *_PACKAGE_POWER_SKU - SKU power and timing parameters. + * Used herein as a 64-bit bit register. + * These masks are defined using GENMASK_ULL as REG_GENMASK is limited to u32 + * and as GENMASK is "long" and therefore 32-bits on a 32-bit system. + * PKG_PKG_TDP, PKG_MIN_PWR, and PKG_MAX_PWR are scaled in the same way as + * PKG_PWR_LIM_*, above. + * PKG_MAX_WIN has sub-fields for x and y, and has the value: is 1.x * 2^y. + */ +#define PKG_PKG_TDP GENMASK_ULL(14, 0) +#define PKG_MIN_PWR GENMASK_ULL(30, 16) +#define PKG_MAX_PWR GENMASK_ULL(46, 32) +#define PKG_MAX_WIN GENMASK_ULL(54, 48) +#define PKG_MAX_WIN_Y GENMASK_ULL(54, 53) +#define PKG_MAX_WIN_X GENMASK_ULL(52, 48) + /* * Logical Context regs */