From patchwork Thu Oct 13 15:45:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Dixit, Ashutosh" X-Patchwork-Id: 13006180 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 0AAF6C433FE for ; Thu, 13 Oct 2022 15:47:05 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B4FEF10E290; Thu, 13 Oct 2022 15:46:39 +0000 (UTC) Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by gabe.freedesktop.org (Postfix) with ESMTPS id 58B8210E288; Thu, 13 Oct 2022 15:46:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1665675988; x=1697211988; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=uZUlZt4TJmLVwvpPUBfGVhwOp09+/73grjxEJE5PLa0=; b=UrqkyNiE73BsJglwFFhDWfNTRz5BTBSFVC5tRM16cZ/Y4OPF06y/VfHR 1PzGzm5cGjVnASoRwAJchNW+TxpE4hd2/h7XTWEJVxUER3xbLRqzes+bZ GfxRzxPmUDC6DF8DwW4UKtztOk76k0iaJ2wUiRd5lv0+pNZRK0fCZHG0t 8DH/zat0sBemmv+q0mBGKAjVvCcCH9HTxWdnO0qqKFu6c2eXiN1IDkjqs xZww8VZbaT1qBE8U8xXuThcT4BUc3a93j8xlxz+vywsJtmGwmZSKJ13sg nDCpB58ilEyhjdx2bp0vd2obhk9+tRUQ1H/QKbB8SglF6Jlaz/k+7yni3 A==; X-IronPort-AV: E=McAfee;i="6500,9779,10499"; a="284842746" X-IronPort-AV: E=Sophos;i="5.95,182,1661842800"; d="scan'208";a="284842746" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Oct 2022 08:45:33 -0700 X-IronPort-AV: E=McAfee;i="6500,9779,10499"; a="660381009" X-IronPort-AV: E=Sophos;i="5.95,182,1661842800"; d="scan'208";a="660381009" Received: from orsosgc001.jf.intel.com (HELO unerlige-ril.jf.intel.com) ([10.165.21.138]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Oct 2022 08:45:30 -0700 From: Ashutosh Dixit To: intel-gfx@lists.freedesktop.org Subject: [PATCH 2/7] drm/i915/hwmon: Add HWMON current voltage support Date: Thu, 13 Oct 2022 08:45:21 -0700 Message-Id: <20221013154526.2105579-3-ashutosh.dixit@intel.com> X-Mailer: git-send-email 2.38.0 In-Reply-To: <20221013154526.2105579-1-ashutosh.dixit@intel.com> References: <20221013154526.2105579-1-ashutosh.dixit@intel.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-hwmon@vger.kernel.org, Andi Shyti , dri-devel@lists.freedesktop.org, Rodrigo Vivi Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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) v5: Added unit of voltage as millivolts (Ashutosh) v6: KernelVersion: 6.2, Date: February 2023 in doc (Tvrtko) v7: Change contact to intel-gfx (Rodrigo) GEN12_RPSTAT1 is available for all Gen12+ (Andi) Added Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon to MAINTAINERS Cc: Guenter Roeck Cc: Anshuman Gupta Signed-off-by: Riana Tauro Signed-off-by: Badal Nilawar Signed-off-by: Ashutosh Dixit Acked-by: Guenter Roeck Reviewed-by: Ashutosh Dixit Reviewed-by: Anshuman Gupta --- .../ABI/testing/sysfs-driver-intel-i915-hwmon | 7 +++ MAINTAINERS | 1 + drivers/gpu/drm/i915/gt/intel_gt_regs.h | 3 ++ drivers/gpu/drm/i915/i915_hwmon.c | 53 +++++++++++++++++++ 4 files changed, 64 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 0000000000000..5f4b136f08509 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon @@ -0,0 +1,7 @@ +What: /sys/devices/.../hwmon/hwmon/in0_input +Date: February 2023 +KernelVersion: 6.2 +Contact: intel-gfx@lists.freedesktop.org +Description: RO. Current Voltage in millivolt. + + Only supported for particular Intel i915 graphics platforms. diff --git a/MAINTAINERS b/MAINTAINERS index f07a8bf8744f9..7d57ede980940 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -10144,6 +10144,7 @@ Q: http://patchwork.freedesktop.org/project/intel-gfx/ B: https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs C: irc://irc.oftc.net/intel-gfx T: git git://anongit.freedesktop.org/drm-intel +F: Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon F: Documentation/gpu/i915.rst F: drivers/gpu/drm/i915/ F: include/drm/i915* diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h index 7f79bbf978284..fcf5f9012852f 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h @@ -1519,6 +1519,9 @@ #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 231552fda374a..025399391ddcc 100644 --- a/drivers/gpu/drm/i915/i915_hwmon.c +++ b/drivers/gpu/drm/i915/i915_hwmon.c @@ -11,8 +11,16 @@ #include "i915_hwmon.h" #include "i915_reg.h" #include "intel_mchbar_regs.h" +#include "gt/intel_gt_regs.h" + +/* + * SF_* - scale factors for particular quantities according to hwmon spec. + * - voltage - millivolts + */ +#define SF_VOLTAGE 1000 struct hwm_reg { + i915_reg_t gt_perf_status; }; struct hwm_drvdata { @@ -29,14 +37,51 @@ 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) +{ + struct drm_i915_private *i915 = ddat->uncore->i915; + + switch (attr) { + case hwmon_in_input: + return IS_DG1(i915) || IS_DG2(i915) ? 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); + /* HW register value 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; } @@ -46,7 +91,11 @@ 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; } @@ -76,6 +125,10 @@ 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; + + /* Available for all Gen12+/dGfx */ + hwmon->rg.gt_perf_status = GEN12_RPSTAT1; } void i915_hwmon_register(struct drm_i915_private *i915)