From patchwork Thu Dec 15 19:17:27 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Dixit, Ashutosh" X-Patchwork-Id: 13074490 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 39D20C4332F for ; Thu, 15 Dec 2022 19:17:38 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2D80810E513; Thu, 15 Dec 2022 19:17:36 +0000 (UTC) Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTPS id E7C4E10E513; Thu, 15 Dec 2022 19:17:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1671131852; x=1702667852; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=iou9Wrf5DCw6IIbHC+yc4W2bLgksXdyaZPYkluAot44=; b=Sbk70tqXuGqOX+SFnJpD299QkwWo5qDapWRACvzKXanY4qnTokCRtIxd XykIXcx8hmzNW3P0FyX52aLZjZxv6cSRR+Tc+TbB+/yFHnLRCwM2f6eK/ MqiYwvdNUAd4Ge9NDhHg8TGJVGKHlOocQJbE4Zzwa+NVK1B2CaB/PE4Sj Xw+0QOdZ/AMkbB0s31WyxrR43h37AiHy6A0jSRpCHHdJjnf0QKlPdZWVZ gExlgDh/BTpvj3bPoG5m7zO044WzVWd3ZGvJ++HJoXGahT3m+jIE4RJ91 xDl+dw5K2WYjy7lqpiQx3+n42pkPf5ZgbHNIGPeKTdC7AWd2qwnLu0u3Z Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10562"; a="306443436" X-IronPort-AV: E=Sophos;i="5.96,248,1665471600"; d="scan'208";a="306443436" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Dec 2022 11:17:31 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10562"; a="738265323" X-IronPort-AV: E=Sophos;i="5.96,248,1665471600"; d="scan'208";a="738265323" Received: from unerlige-ril.jf.intel.com ([10.165.21.138]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Dec 2022 11:17:31 -0800 From: Ashutosh Dixit To: intel-gfx@lists.freedesktop.org Date: Thu, 15 Dec 2022 11:17:27 -0800 Message-Id: <20221215191727.2468770-1-ashutosh.dixit@intel.com> X-Mailer: git-send-email 2.38.0 MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH] drm/i915/hwmon: Display clamped PL1 limit 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: , Cc: dri-devel@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" HW allows arbitrary PL1 limits to be set but silently clamps these values to "typical but not guaranteed" min/max values in pkg_power_sku register. Follow the same pattern for sysfs, allow arbitrary PL1 limits to be set but display clamped values when read, so that users see PL1 limits HW is likely using. Otherwise users think HW is using arbitrarily high/low PL1 limits they might have set. The previous write/read I1 power1_crit limit also follows the same clamping pattern. v2: Explain "why" in commit message and include bug link (Jani Nikula) Bug: https://gitlab.freedesktop.org/drm/intel/-/issues/7704 Signed-off-by: Ashutosh Dixit Reviewed-by: Anshuman Gupta --- drivers/gpu/drm/i915/i915_hwmon.c | 39 ++++++++++++++++++++---- drivers/gpu/drm/i915/intel_mchbar_regs.h | 2 ++ 2 files changed, 35 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c index cca7a4350ec8f..1225bc432f0d5 100644 --- a/drivers/gpu/drm/i915/i915_hwmon.c +++ b/drivers/gpu/drm/i915/i915_hwmon.c @@ -359,6 +359,38 @@ hwm_power_is_visible(const struct hwm_drvdata *ddat, u32 attr, int chan) } } +/* + * HW allows arbitrary PL1 limits to be set but silently clamps these values to + * "typical but not guaranteed" min/max values in rg.pkg_power_sku. Follow the + * same pattern for sysfs, allow arbitrary PL1 limits to be set but display + * clamped values when read. Write/read I1 also follows the same pattern. + */ +static int +hwm_power_max_read(struct hwm_drvdata *ddat, long *val) +{ + struct i915_hwmon *hwmon = ddat->hwmon; + intel_wakeref_t wakeref; + u64 r, min, max; + + *val = hwm_field_read_and_scale(ddat, + hwmon->rg.pkg_rapl_limit, + PKG_PWR_LIM_1, + hwmon->scl_shift_power, + SF_POWER); + + with_intel_runtime_pm(ddat->uncore->rpm, wakeref) + r = intel_uncore_read64(ddat->uncore, hwmon->rg.pkg_power_sku); + min = REG_FIELD_GET(PKG_MIN_PWR, r); + min = mul_u64_u32_shr(min, SF_POWER, hwmon->scl_shift_power); + max = REG_FIELD_GET(PKG_MAX_PWR, r); + max = mul_u64_u32_shr(max, SF_POWER, hwmon->scl_shift_power); + + if (min && max) + *val = clamp_t(u64, *val, min, max); + + return 0; +} + static int hwm_power_read(struct hwm_drvdata *ddat, u32 attr, int chan, long *val) { @@ -368,12 +400,7 @@ hwm_power_read(struct hwm_drvdata *ddat, u32 attr, int chan, long *val) switch (attr) { case hwmon_power_max: - *val = hwm_field_read_and_scale(ddat, - hwmon->rg.pkg_rapl_limit, - PKG_PWR_LIM_1, - hwmon->scl_shift_power, - SF_POWER); - return 0; + return hwm_power_max_read(ddat, val); case hwmon_power_rated_max: *val = hwm_field_read_and_scale(ddat, hwmon->rg.pkg_power_sku, diff --git a/drivers/gpu/drm/i915/intel_mchbar_regs.h b/drivers/gpu/drm/i915/intel_mchbar_regs.h index f93e9af43ac35..73900c098d591 100644 --- a/drivers/gpu/drm/i915/intel_mchbar_regs.h +++ b/drivers/gpu/drm/i915/intel_mchbar_regs.h @@ -194,6 +194,8 @@ */ #define PCU_PACKAGE_POWER_SKU _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5930) #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_X GENMASK_ULL(54, 53) #define PKG_MAX_WIN_Y GENMASK_ULL(52, 48)