From patchwork Fri Aug 12 17:37:10 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Nilawar, Badal" X-Patchwork-Id: 12942430 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D2613C3F6B0 for ; Fri, 12 Aug 2022 17:36:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239118AbiHLRfp (ORCPT ); Fri, 12 Aug 2022 13:35:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41052 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239534AbiHLRfh (ORCPT ); Fri, 12 Aug 2022 13:35:37 -0400 Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5A39F76466 for ; Fri, 12 Aug 2022 10:35:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1660325736; x=1691861736; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=9R4cPjYPX1c5sT+4C2xWlqrIjRNGYjihrlyURO/woY4=; b=c9ZMnbZZPz2sO4wr+F1InHctYKnDMVdFJO0UWhPas5iZPow55ELMKwCt EDDzk9F+tnQsy1iGbSqPmUoWRaB5nJFGm8lfJSCds3R7ER5+/K8/nDZUr 6X49POcZ6IshaVGftdXNzYzAVD8yber+a1TC9lnvH05yVt3ltpV89kg7L XBeXb2uMpusILphJ1JwbLjkrP7qrxl72zxOFLwrnsxkQOtIU3RJB7rbvL X8FF29xDbGMGGRH2VwiHPa+gSu/OjWhImD0Kq113Gc8X+sH9KFvit3EE9 x/0DifFhgBEMQeBRx2knL5iE7+OcFiyt9Mg0SAEAJQ+nTp+0PmoZXeLsI w==; X-IronPort-AV: E=McAfee;i="6400,9594,10437"; a="291643999" X-IronPort-AV: E=Sophos;i="5.93,233,1654585200"; d="scan'208";a="291643999" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Aug 2022 10:35:36 -0700 X-IronPort-AV: E=Sophos;i="5.93,233,1654585200"; d="scan'208";a="665904275" Received: from bnilawar-desk1.iind.intel.com ([10.145.169.158]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Aug 2022 10:35:33 -0700 From: Badal Nilawar To: intel-gfx@lists.freedesktop.org Cc: linux-hwmon@vger.kernel.org, ashutosh.dixit@intel.com, riana.tauro@intel.com, anshuman.gupta@intel.com, jon.ewins@intel.com, linux@roeck-us.net Subject: [PATCH 2/7] drm/i915/hwmon: Add HWMON current voltage support Date: Fri, 12 Aug 2022 23:07:10 +0530 Message-Id: <20220812173715.2398586-3-badal.nilawar@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220812173715.2398586-1-badal.nilawar@intel.com> References: <20220812173715.2398586-1-badal.nilawar@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org From: Riana Tauro Use i915 HWMON subsystem to display current input voltage. v2: - Updated date and kernel version in feature description - Fixed review comments (Ashutosh) v3: Use macro HWMON_CHANNEL_INFO to define hwmon channel (Guenter) v4: - Fixed review comments (Ashutosh) - Use hwm_ prefix for static functions (Ashutosh) Cc: Guenter Roeck Cc: Anshuman Gupta Signed-off-by: Riana Tauro Signed-off-by: Badal Nilawar Acked-by: Guenter Roeck --- .../ABI/testing/sysfs-driver-intel-i915-hwmon | 7 +++ drivers/gpu/drm/i915/gt/intel_gt_regs.h | 3 ++ drivers/gpu/drm/i915/i915_hwmon.c | 47 +++++++++++++++++++ 3 files changed, 57 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon diff --git a/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon new file mode 100644 index 000000000000..24c4b7477d51 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon @@ -0,0 +1,7 @@ +What: /sys/devices/.../hwmon/hwmon/in0_input +Date: June 2022 +KernelVersion: 5.19 +Contact: dri-devel@lists.freedesktop.org +Description: RO. Current Voltage in millivolt. + + Only supported for particular Intel i915 graphics platforms. diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h index b3b49f6d6d1c..4604f6dbf8b6 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h @@ -1498,6 +1498,9 @@ #define VLV_RENDER_C0_COUNT _MMIO(0x138118) #define VLV_MEDIA_C0_COUNT _MMIO(0x13811c) +#define GEN12_RPSTAT1 _MMIO(0x1381b4) +#define GEN12_VOLTAGE_MASK REG_GENMASK(10, 0) + #define GEN11_GT_INTR_DW(x) _MMIO(0x190018 + ((x) * 4)) #define GEN11_CSME (31) #define GEN11_GUNIT (28) diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c index 5b80a0f024f0..1893efe796a4 100644 --- a/drivers/gpu/drm/i915/i915_hwmon.c +++ b/drivers/gpu/drm/i915/i915_hwmon.c @@ -10,8 +10,10 @@ #include "i915_drv.h" #include "i915_hwmon.h" #include "intel_mchbar_regs.h" +#include "gt/intel_gt_regs.h" struct hwm_reg { + i915_reg_t gt_perf_status; }; struct hwm_drvdata { @@ -28,14 +30,49 @@ struct i915_hwmon { }; static const struct hwmon_channel_info *hwm_info[] = { + HWMON_CHANNEL_INFO(in, HWMON_I_INPUT), NULL }; +static umode_t +hwm_in_is_visible(const struct hwm_drvdata *ddat, u32 attr) +{ + switch (attr) { + case hwmon_in_input: + return i915_mmio_reg_valid(ddat->hwmon->rg.gt_perf_status) ? 0444 : 0; + default: + return 0; + } +} + +static int +hwm_in_read(struct hwm_drvdata *ddat, u32 attr, long *val) +{ + struct i915_hwmon *hwmon = ddat->hwmon; + intel_wakeref_t wakeref; + u32 reg_value; + + switch (attr) { + case hwmon_in_input: + with_intel_runtime_pm(ddat->uncore->rpm, wakeref) + reg_value = intel_uncore_read(ddat->uncore, hwmon->rg.gt_perf_status); + /* In units of 2.5 millivolt */ + *val = DIV_ROUND_CLOSEST(REG_FIELD_GET(GEN12_VOLTAGE_MASK, reg_value) * 25, 10); + return 0; + default: + return -EOPNOTSUPP; + } +} + static umode_t hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr, int channel) { + struct hwm_drvdata *ddat = (struct hwm_drvdata *)drvdata; + switch (type) { + case hwmon_in: + return hwm_in_is_visible(ddat, attr); default: return 0; } @@ -45,7 +82,11 @@ static int hwm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { + struct hwm_drvdata *ddat = dev_get_drvdata(dev); + switch (type) { + case hwmon_in: + return hwm_in_read(ddat, attr, val); default: return -EOPNOTSUPP; } @@ -75,6 +116,12 @@ static const struct hwmon_chip_info hwm_chip_info = { static void hwm_get_preregistration_info(struct drm_i915_private *i915) { + struct i915_hwmon *hwmon = i915->hwmon; + + if (IS_DG1(i915) || IS_DG2(i915)) + hwmon->rg.gt_perf_status = GEN12_RPSTAT1; + else + hwmon->rg.gt_perf_status = INVALID_MMIO_REG; } void i915_hwmon_register(struct drm_i915_private *i915)