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 A4555C43602 for ; Mon, 6 Jul 2026 11:47:52 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 6809210E8F3; Mon, 6 Jul 2026 11:47:47 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=lankhorst.se header.i=@lankhorst.se header.b="LV0NzvAl"; dkim-atps=neutral Received: from lankhorst.se (unknown [141.105.120.124]) by gabe.freedesktop.org (Postfix) with ESMTPS id 1F46510E336; Mon, 6 Jul 2026 11:47:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=lankhorst.se; s=default; t=1783338464; bh=W9LVkaWCJ6mz1Fpj26b8EiLt/bi8HRInnG4tcu+I5vE=; h=From:To:Cc:Subject:Date:From; b=LV0NzvAl/xYaq/AI2C7cMoXya0/fswznzObwhHJk1OM7BAKTA9QOD1nz3+8FArWNy HXM+AaaEPMpyO+uWgtMs0yI7yz/qlCBNnD0Xz52mbPdU9iKMDd3ylFqQlrZs8q9kNA FHhnkfv5LQv7c1RMWuUzl4D9XCS9vt08/3TcsI6zmgCAI/vFPOFIl01snLoObd4qEK GqI1aUszYvEaxFXOrUP33hblLBqLNcMYuD0x8bMU1/zxlTuGBJC56xaei7n63+J77I 9yUFxtou2nTxwIBo43YL2XYHWhRKO+C1HCULZgU77KXQu85CaumSaF+7+wbaxnjS11 U4EvRQQeXaa1Q== From: Maarten Lankhorst To: intel-gfx@lists.freedesktop.org Cc: dri-devel@lists.freedesktop.org, Maarten Lankhorst , Sebastian Andrzej Siewior Subject: [PATCH v4 0/7] drm/i915: All fixes to make i915 work well with PREEMPT_RT. Date: Mon, 6 Jul 2026 13:48:16 +0200 Message-ID: <20260706114823.752313-1-dev@lankhorst.se> X-Mailer: git-send-email 2.53.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" 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. Changes since v3: - Fix some issues in last patch found by sashiko. Changes since v2: - Remove the extra signaler_active lock, it broke because it didn't protect anything, instead use signalers_lock. 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 signalers_lock to prevent starvation of irq_work. drivers/gpu/drm/i915/gt/intel_breadcrumbs.c | 172 +++++++++++------- .../gpu/drm/i915/gt/intel_breadcrumbs_types.h | 1 - drivers/gpu/drm/i915/gt/intel_context.c | 1 + 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 + 9 files changed, 130 insertions(+), 82 deletions(-) -- 2.53.0