From patchwork Mon Mar 20 20:23:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andi Shyti X-Patchwork-Id: 13181826 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 76B8AC6FD1C for ; Mon, 20 Mar 2023 20:24:11 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0C58910E658; Mon, 20 Mar 2023 20:24:11 +0000 (UTC) Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9E2F810E64E; Mon, 20 Mar 2023 20:24:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1679343848; x=1710879848; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=m3dCqcFyFG/fACxCjySSjXusWYgaQZyRy/40ttC+ldw=; b=gHsyW9VTAenZQ83a48NtsVflvfsw8rQzrZLdFDRMW8XXK6JK3K557hU1 cDQn4CDyfdWOfaAI/MaMtDFP4exdkNqC5fxzJl4u4z8yX67NFpXaJQzhT ID1hire1PpUaT6LjByBqeqZeJaRz/DX+aWSPDkwTXHM4J3qkU66UUyiQV Pa4fi8kmPjeFXVw5JVMD9lO+0rCEFasko/uLLEh+jXu2moyGzi59OLyp6 W75dEMsRPbzORtarXBmLy9EV4Q+dtENRorYSMdTT4XporSx+oD5pO056l aNLmXgolxvsFCevhU+0AyaYMLUgEPDulaIxFze1ma0gA3IgokiWhL9+Al w==; X-IronPort-AV: E=McAfee;i="6600,9927,10655"; a="401343263" X-IronPort-AV: E=Sophos;i="5.98,276,1673942400"; d="scan'208";a="401343263" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Mar 2023 13:24:08 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10655"; a="805025626" X-IronPort-AV: E=Sophos;i="5.98,276,1673942400"; d="scan'208";a="805025626" Received: from ivolodix-mobl.ccr.corp.intel.com (HELO intel.com) ([10.252.62.92]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Mar 2023 13:24:06 -0700 From: Andi Shyti To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Matt Roper Date: Mon, 20 Mar 2023 21:23:26 +0100 Message-Id: <20230320202326.296498-3-andi.shyti@linux.intel.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230320202326.296498-1-andi.shyti@linux.intel.com> References: <20230320202326.296498-1-andi.shyti@linux.intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 2/2] drm/i915: Check for unreliable MMIO during forcewake 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: Andi Shyti Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Matt Roper Although we now sanitycheck MMIO access during driver load to make sure the MMIO BAR isn't returning all 0xFFFFFFFF, there have been a few cases where (temporarily?) unreliable MMIO access has happened after GPU resets or power events. We'll often notice this on our next GT register access since forcewake handling will fail; let's change our handling slightly so that when this happens we print a more meaningful message clarifying that the problem is the MMIO access, not forcewake specifically. Signed-off-by: Matt Roper Cc: Mika Kuoppala Signed-off-by: Andi Shyti --- drivers/gpu/drm/i915/intel_uncore.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c index 14ec45e6facfa..8b40a9772df5f 100644 --- a/drivers/gpu/drm/i915/intel_uncore.c +++ b/drivers/gpu/drm/i915/intel_uncore.c @@ -178,9 +178,15 @@ static inline void fw_domain_wait_ack_clear(const struct intel_uncore_forcewake_domain *d) { if (wait_ack_clear(d, FORCEWAKE_KERNEL)) { - drm_err(&d->uncore->i915->drm, - "%s: timed out waiting for forcewake ack to clear.\n", - intel_uncore_forcewake_domain_to_str(d->id)); + if (fw_ack(d) == ~0) + drm_err(&d->uncore->i915->drm, + "%s: MMIO unreliable (forcewake register returns 0xFFFFFFFF)!\n", + intel_uncore_forcewake_domain_to_str(d->id)); + else + drm_err(&d->uncore->i915->drm, + "%s: timed out waiting for forcewake ack to clear.\n", + intel_uncore_forcewake_domain_to_str(d->id)); + add_taint_for_CI(d->uncore->i915, TAINT_WARN); /* CI now unreliable */ } }