From patchwork Wed Sep 27 21:03:56 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nirmoy Das X-Patchwork-Id: 13401680 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 25325E82CD8 for ; Wed, 27 Sep 2023 21:11:22 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8FFCE10E5B6; Wed, 27 Sep 2023 21:11:17 +0000 (UTC) Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.7]) by gabe.freedesktop.org (Postfix) with ESMTPS id C642510E5A5; Wed, 27 Sep 2023 21:11:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1695849074; x=1727385074; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Xv1/sRvQWGiLl6f9AeUIgkAHIZW7uPHm1MOTnUm1BWI=; b=KGOktR/JP4fE1SFlc9pi04+A105hnxrvVNIiZHwKULYefAQNDCRD2mer p2KO+45BL7K0YfYH8BSjC/w0Nz+GXbdpwkwfRvwIkQZhJC6fRwDQ1nPR+ eQgiY4jW+OUNQJqrk26zzZK+ph5KhYGIX2bYugcE2z3Jpl33wwgobaiIe MZPc+lHiw5hW42wUU+ykO/7nG43dLRFX6ZbBgILi6F1FDggtsbytrFgGV 2OoepDMiQmr+ePSTQQxyvyVtXi6Tp8eo0zqM0FN3soJ5uVXI2ww/Q2bPv 8qWYxEJlkn49mEZAMAI3lljBZhvmH9UJkXLQA7jpEXnmI22oCEOCGLhWZ g==; X-IronPort-AV: E=McAfee;i="6600,9927,10846"; a="3470822" X-IronPort-AV: E=Sophos;i="6.03,182,1694761200"; d="scan'208";a="3470822" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmvoesa101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Sep 2023 14:04:10 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10846"; a="864987677" X-IronPort-AV: E=Sophos;i="6.03,182,1694761200"; d="scan'208";a="864987677" Received: from nirmoyda-desk.igk.intel.com ([10.102.138.190]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Sep 2023 14:04:08 -0700 From: Nirmoy Das To: intel-gfx@lists.freedesktop.org Subject: [PATCH v6 3/4] drm/i915: Reset steer semaphore for media GT on resume Date: Wed, 27 Sep 2023 23:03:56 +0200 Message-ID: <20230927210357.17461-3-nirmoy.das@intel.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230927210357.17461-1-nirmoy.das@intel.com> References: <20230927210357.17461-1-nirmoy.das@intel.com> MIME-Version: 1.0 Organization: Intel Deutschland GmbH, Registered Address: Am Campeon 10, 85579 Neubiberg, Germany, Commercial Register: Amtsgericht Muenchen HRB 186928 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: matthew.d.roper@intel.com, andi.shyti@linux.intel.com, dri-devel@lists.freedesktop.org, Nirmoy Das Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" During resume, the steer semaphore on GT1 was observed to be held. The hardware team has confirmed the safety of clearing the steer semaphore during driver load/resume, as no lock acquisitions can occur in this process by other agents. v2: reset on resume not in intel_gt_init(). v3: do the reset on intel_gt_resume_early() Signed-off-by: Nirmoy Das Reviewed-by: Andi Shyti --- drivers/gpu/drm/i915/gt/intel_gt_pm.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.c b/drivers/gpu/drm/i915/gt/intel_gt_pm.c index dab73980c9f1..59cebf205b72 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_pm.c +++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c @@ -13,6 +13,7 @@ #include "intel_engine_pm.h" #include "intel_gt.h" #include "intel_gt_clock_utils.h" +#include "intel_gt_mcr.h" #include "intel_gt_pm.h" #include "intel_gt_print.h" #include "intel_gt_requests.h" @@ -218,6 +219,17 @@ void intel_gt_pm_fini(struct intel_gt *gt) void intel_gt_resume_early(struct intel_gt *gt) { + /* + * Reset the steer semaphore on GT1, as we have observed it + * remaining held after a suspend operation. Confirmation + * from the hardware team ensures the safety of resetting + * the steer semaphore during driver load/resume, as there + * are no lock acquisitions during this process by other + * agents. + */ + if (MEDIA_VER(gt->i915) >= 13 && gt->type == GT_MEDIA) + intel_gt_mcr_lock_reset(gt); + intel_uncore_resume_early(gt->uncore); intel_gt_check_and_clear_faults(gt); }