From mboxrd@z Thu Jan 1 00:00:00 1970 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 1E0D6CCFA04 for ; Tue, 4 Nov 2025 10:47:01 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id D7D5710E5B9; Tue, 4 Nov 2025 10:47:00 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="iZuBQM8P"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.18]) by gabe.freedesktop.org (Postfix) with ESMTPS id 8B6C210E5B9 for ; Tue, 4 Nov 2025 10:46:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1762253220; x=1793789220; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=n0PUGzb5x7FAjshyeDqKiLFq3NoayU+1aE7cbpw/OrE=; b=iZuBQM8Pqcj5g6DbWQaX7c3oR87LmKzRJMVSVtdIoTSyDp0lh2iKBThr B3OnIJB38WMDesTPunc4ehIOYlpQmpWWTsU8D5jtW+vFlkq0gNFhIwYOG N+mzzcphClzVdX4sW2/x/UsTHs1rIaAs5Vd9BnJ9WwbIBP8IyTT2Fd/a1 gB2N6blpIRNbiggGLIuiM9Q2fH4KTDbAzxGVW9npIInDCjhrAZU5A+LLv TI+D6bWorjaEbXWxUklqAcv4sCp43Vtdegrep3t+C7QFaFiWjWRqqvCMp TOzA8zshDjgk8wE5oIO9G0EcdZEzJ9kvk1mvnNcNl/d3Q0tmE7Ewz8LJ1 A==; X-CSE-ConnectionGUID: 4rcb5nhrRsWD4Ic/VE7Gvg== X-CSE-MsgGUID: 2yEIRKcMRoS3wjTpcj/aNQ== X-IronPort-AV: E=McAfee;i="6800,10657,11602"; a="64383686" X-IronPort-AV: E=Sophos;i="6.19,278,1754982000"; d="scan'208";a="64383686" Received: from orviesa001.jf.intel.com ([10.64.159.141]) by orvoesa110.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Nov 2025 02:47:00 -0800 X-CSE-ConnectionGUID: Ro0Vd+GuQ9mAaj7jlz/gVA== X-CSE-MsgGUID: J1JZvUtvQD6Sk1HS+lD+Fw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,278,1754982000"; d="scan'208";a="224377412" Received: from anirban-z690i-a-ultra-plus.iind.intel.com ([10.190.216.83]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Nov 2025 02:46:55 -0800 From: Sk Anirban To: intel-xe@lists.freedesktop.org Cc: anshuman.gupta@intel.com, badal.nilawar@intel.com, riana.tauro@intel.com, karthik.poosa@intel.com, raag.jadav@intel.com, soham.purkait@intel.com, mallesh.koujalagi@intel.com, vinay.belgaumkar@intel.com, rodrigo.vivi@intel.com, Sk Anirban Subject: [PATCH v5 1/2] drm/xe/guc: Eliminate RPe caching for SLPC parameter handling Date: Tue, 4 Nov 2025 16:12:09 +0530 Message-ID: <20251104104207.696448-5-sk.anirban@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251104104207.696448-4-sk.anirban@intel.com> References: <20251104104207.696448-4-sk.anirban@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: intel-xe@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Xe graphics driver List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-xe-bounces@lists.freedesktop.org Sender: "Intel-xe" RPe is runtime-determined by PCODE and caching it caused stale values, leading to incorrect GuC SLPC parameter settings. Drop the cached rpe_freq field and query fresh values from hardware on each use to ensure GuC SLPC parameters reflect current RPe. v2: Remove cached RPe frequency field (Rodrigo) v3: Remove extra variable (Vinay) Modify function name (Vinay) v4: Maintain a separate function for PVC (Rodrigo) v5: Avoid RPn update while fetching RPe frequency (Rodrigo) Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/5166 Signed-off-by: Sk Anirban --- drivers/gpu/drm/xe/xe_guc_pc.c | 68 ++++++++++++++-------------- drivers/gpu/drm/xe/xe_guc_pc_types.h | 2 - 2 files changed, 35 insertions(+), 35 deletions(-) diff --git a/drivers/gpu/drm/xe/xe_guc_pc.c b/drivers/gpu/drm/xe/xe_guc_pc.c index 3c0feb50a1e2..a9c29f123b37 100644 --- a/drivers/gpu/drm/xe/xe_guc_pc.c +++ b/drivers/gpu/drm/xe/xe_guc_pc.c @@ -330,7 +330,7 @@ static int pc_set_min_freq(struct xe_guc_pc *pc, u32 freq) * Our goal is to have the admin choices respected. */ pc_action_set_param(pc, SLPC_PARAM_IGNORE_EFFICIENT_FREQUENCY, - freq < pc->rpe_freq); + freq < xe_guc_pc_get_rpe_freq(pc)); return pc_action_set_param(pc, SLPC_PARAM_GLOBAL_MIN_GT_UNSLICE_FREQ_MHZ, @@ -375,7 +375,7 @@ static void mtl_update_rpa_value(struct xe_guc_pc *pc) pc->rpa_freq = decode_freq(REG_FIELD_GET(MTL_RPA_MASK, reg)); } -static void mtl_update_rpe_value(struct xe_guc_pc *pc) +static u32 mtl_get_rpe_freq(struct xe_guc_pc *pc) { struct xe_gt *gt = pc_to_gt(pc); u32 reg; @@ -385,7 +385,7 @@ static void mtl_update_rpe_value(struct xe_guc_pc *pc) else reg = xe_mmio_read32(>->mmio, MTL_GT_RPE_FREQUENCY); - pc->rpe_freq = decode_freq(REG_FIELD_GET(MTL_RPE_MASK, reg)); + return decode_freq(REG_FIELD_GET(MTL_RPE_MASK, reg)); } static void tgl_update_rpa_value(struct xe_guc_pc *pc) @@ -408,24 +408,22 @@ static void tgl_update_rpa_value(struct xe_guc_pc *pc) } } -static void tgl_update_rpe_value(struct xe_guc_pc *pc) +static u32 pvc_get_rpe_freq(struct xe_guc_pc *pc) { struct xe_gt *gt = pc_to_gt(pc); - struct xe_device *xe = gt_to_xe(gt); u32 reg; - /* - * For PVC we still need to use fused RP1 as the approximation for RPe - * For other platforms than PVC we get the resolved RPe directly from - * PCODE at a different register - */ - if (xe->info.platform == XE_PVC) { - reg = xe_mmio_read32(>->mmio, PVC_RP_STATE_CAP); - pc->rpe_freq = REG_FIELD_GET(RP1_MASK, reg) * GT_FREQUENCY_MULTIPLIER; - } else { - reg = xe_mmio_read32(>->mmio, FREQ_INFO_REC); - pc->rpe_freq = REG_FIELD_GET(RPE_MASK, reg) * GT_FREQUENCY_MULTIPLIER; - } + reg = xe_mmio_read32(>->mmio, PVC_RP_STATE_CAP); + return REG_FIELD_GET(RP1_MASK, reg) * GT_FREQUENCY_MULTIPLIER; +} + +static u32 tgl_get_rpe_freq(struct xe_guc_pc *pc) +{ + struct xe_gt *gt = pc_to_gt(pc); + u32 reg; + + reg = xe_mmio_read32(>->mmio, FREQ_INFO_REC); + return REG_FIELD_GET(RPE_MASK, reg) * GT_FREQUENCY_MULTIPLIER; } static void pc_update_rp_values(struct xe_guc_pc *pc) @@ -433,20 +431,10 @@ static void pc_update_rp_values(struct xe_guc_pc *pc) struct xe_gt *gt = pc_to_gt(pc); struct xe_device *xe = gt_to_xe(gt); - if (GRAPHICS_VERx100(xe) >= 1270) { + if (GRAPHICS_VERx100(xe) >= 1270) mtl_update_rpa_value(pc); - mtl_update_rpe_value(pc); - } else { + else tgl_update_rpa_value(pc); - tgl_update_rpe_value(pc); - } - - /* - * RPe is decided at runtime by PCODE. In the rare case where that's - * smaller than the fused min, we will trust the PCODE and use that - * as our minimum one. - */ - pc->rpn_freq = min(pc->rpn_freq, pc->rpe_freq); } /** @@ -560,9 +548,23 @@ u32 xe_guc_pc_get_rpa_freq(struct xe_guc_pc *pc) */ u32 xe_guc_pc_get_rpe_freq(struct xe_guc_pc *pc) { - pc_update_rp_values(pc); + struct xe_gt *gt = pc_to_gt(pc); + struct xe_device *xe = gt_to_xe(gt); + u32 freq; - return pc->rpe_freq; + /* + * For PVC we still need to use fused RP1 as the approximation for RPe + * For other platforms than PVC we get the resolved RPe directly from + * PCODE at a different register + */ + if (GRAPHICS_VERx100(xe) >= 1260) + freq = pvc_get_rpe_freq(pc); + else if (GRAPHICS_VERx100(xe) >= 1270) + freq = mtl_get_rpe_freq(pc); + else + freq = tgl_get_rpe_freq(pc); + + return freq; } /** @@ -1021,7 +1023,7 @@ static int pc_set_mert_freq_cap(struct xe_guc_pc *pc) /* * Ensure min and max are bound by MERT_FREQ_CAP until driver loads. */ - ret = pc_set_min_freq(pc, min(pc->rpe_freq, pc_max_freq_cap(pc))); + ret = pc_set_min_freq(pc, min(xe_guc_pc_get_rpe_freq(pc), pc_max_freq_cap(pc))); if (!ret) ret = pc_set_max_freq(pc, min(pc->rp0_freq, pc_max_freq_cap(pc))); @@ -1339,7 +1341,7 @@ static void xe_guc_pc_fini_hw(void *arg) XE_WARN_ON(xe_guc_pc_stop(pc)); /* Bind requested freq to mert_freq_cap before unload */ - pc_set_cur_freq(pc, min(pc_max_freq_cap(pc), pc->rpe_freq)); + pc_set_cur_freq(pc, min(pc_max_freq_cap(pc), xe_guc_pc_get_rpe_freq(pc))); xe_force_wake_put(gt_to_fw(pc_to_gt(pc)), fw_ref); } diff --git a/drivers/gpu/drm/xe/xe_guc_pc_types.h b/drivers/gpu/drm/xe/xe_guc_pc_types.h index 5e4ea53fbee6..f27c05d81706 100644 --- a/drivers/gpu/drm/xe/xe_guc_pc_types.h +++ b/drivers/gpu/drm/xe/xe_guc_pc_types.h @@ -21,8 +21,6 @@ struct xe_guc_pc { u32 rp0_freq; /** @rpa_freq: HW RPa frequency - The Achievable one */ u32 rpa_freq; - /** @rpe_freq: HW RPe frequency - The Efficient one */ - u32 rpe_freq; /** @rpn_freq: HW RPN frequency - The Minimum one */ u32 rpn_freq; /** @user_requested_min: Stash the minimum requested freq by user */ -- 2.43.0