From patchwork Thu Aug 18 19:38:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Nilawar, Badal" X-Patchwork-Id: 12947724 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 07C14C32772 for ; Thu, 18 Aug 2022 19:37:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232038AbiHRThO (ORCPT ); Thu, 18 Aug 2022 15:37:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45910 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244691AbiHRThN (ORCPT ); Thu, 18 Aug 2022 15:37:13 -0400 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D1D6FCE4B1 for ; Thu, 18 Aug 2022 12:37:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1660851432; x=1692387432; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=jzHMyg0wKux4CdPoA1Z2aNCD0K2YbuFrJesxI4SudO0=; b=UPnd1i60AT1OSY0s9KT7R12m9KP3FKi5SVLvVhbb0klTj+SJG81Pzo2u SKq/DhMCelgPXqTM/xhad3OCTcGTSt2xNSXGJ9721cD+LRWdqjQjm6PZs XopoJQaRQqdHKn21eVJ4/NAP7KVYkdVusfqdL18KncHlF079jJA1b/jpk U9yew1uUfcVl9uD0QAJWujMxMwsqku4FTXyfHm4N9IANtb04RgGhb7tBp zh9ckVMwqpNsA1VibipPBB6f4J4ps6nfmHVl0v9JlQNypCc4WI9ATemBe L3MGxFjtxadEFV6Uodr+9y6BmU08ZvEsMIYPOnfm2H3QNkgOP/L3VRpPY w==; X-IronPort-AV: E=McAfee;i="6500,9779,10443"; a="272627865" X-IronPort-AV: E=Sophos;i="5.93,247,1654585200"; d="scan'208";a="272627865" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Aug 2022 12:37:12 -0700 X-IronPort-AV: E=Sophos;i="5.93,247,1654585200"; d="scan'208";a="604364659" Received: from bnilawar-desk1.iind.intel.com ([10.145.169.158]) by orsmga007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Aug 2022 12:37:09 -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, 19 Aug 2022 01:08:56 +0530 Message-Id: <20220818193901.2974625-3-badal.nilawar@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220818193901.2974625-1-badal.nilawar@intel.com> References: <20220818193901.2974625-1-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 94f9ddcfb3a5..5d4fbda4d326 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h @@ -1508,6 +1508,9 @@ #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)