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 4CDEFC43602 for ; Fri, 3 Jul 2026 11:32:46 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0760A10F7C0; Fri, 3 Jul 2026 11:32:38 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=lankhorst.se header.i=@lankhorst.se header.b="EDp6E9oA"; dkim-atps=neutral Received: from lankhorst.se (unknown [141.105.120.124]) by gabe.freedesktop.org (Postfix) with ESMTPS id 686D010E5B8; Fri, 3 Jul 2026 11:32:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=lankhorst.se; s=default; t=1783078352; bh=ha6JuY59zkP0E76SyxjpvCAJ8EMeACPbzS5V6uJKIyA=; h=From:To:Cc:Subject:Date:From; b=EDp6E9oAYDmj+EoIDyJuT9zisU/vuR+VkbF84H+jFkf5lnULyVuGd7I33a5mn4AWt Im9fJnVYk9trbGZD07yj7SL1WaBqv5ckMSFUJNgeSvsgrC8dOLwjnu/nwje0rfWECf 5k0uSn0mLad/4f5VM+fxQhqQB+/amXs3jlyLZlzhfP5Lrkt5wJqyPHToypAXqcrrCu yeSDqCFEGL3///+Qbm30jeb9PBK8wofqrZDu+YliSBtoYzORThyHawGogAKxQ/qUq/ N2c1V0E2ld0EhYWyP9Ms40bbkX52+lDjieCQpycbp202IgvJQDFVmqh7VqI1s0cIno hngSyzdqiEfmw== From: Maarten Lankhorst To: intel-gfx@lists.freedesktop.org Cc: dri-devel@lists.freedesktop.org, Maarten Lankhorst , Sebastian Andrzej Siewior Subject: [PATCH v2 0/7] drm/i915: All fixes to make i915 work well with PREEMPT_RT. Date: Fri, 3 Jul 2026 13:32:52 +0200 Message-ID: <20260703113259.801374-1-dev@lankhorst.se> X-Mailer: git-send-email 2.53.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" All fixes to make the core i915 module (without display) working correctly on PREEMPT_RT. Some fixes are still needed, as the selftests still fail. But otherwise the test results were looking good on PREEMPT_RT. It looks like the patch that added a spinlock caused a regression on !PREEMPT_RT, and may even have caused similar test failures on PREEMPT_RT, so to fix it I removed RCU entirely, and converted to a locked implementation instead. This time at least, i915 live selftests pass on !PREEMPRT_RT for at least 1 machine with same config as CI. Cc: Sebastian Andrzej Siewior Maarten Lankhorst (3): drm/i915/gt: Fix selftests on PREEMPT_RT drm/i915/gt: Set stop_timeout() correctly on PREEMPT-RT drm/i915: Use sleeping selftests for igt_atomic on PREEMPT_RT Sebastian Andrzej Siewior (4): drm/i915/gt: Use spin_lock_irq() instead of local_irq_disable() + spin_lock() drm/i915: Drop the irqs_disabled() check drm/i915/guc: Consider also RCU depth in busy loop. drm/i915/gt: Use a spinlock to prevent starvation of irq_work. drivers/gpu/drm/i915/gt/intel_breadcrumbs.c | 89 ++++++++++++------- .../gpu/drm/i915/gt/intel_breadcrumbs_types.h | 2 +- drivers/gpu/drm/i915/gt/intel_engine_cs.c | 2 +- .../drm/i915/gt/intel_execlists_submission.c | 17 ++-- drivers/gpu/drm/i915/gt/selftest_engine_pm.c | 8 +- drivers/gpu/drm/i915/gt/uc/intel_guc.h | 2 +- drivers/gpu/drm/i915/i915_request.c | 2 - drivers/gpu/drm/i915/selftests/igt_atomic.c | 7 ++ 8 files changed, 74 insertions(+), 55 deletions(-) -- 2.53.0