From patchwork Mon Jul 4 08:09:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 12905646 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 C229BC433EF for ; Mon, 4 Jul 2022 16:22:27 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B118B10E8F3; Mon, 4 Jul 2022 16:16:11 +0000 (UTC) Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by gabe.freedesktop.org (Postfix) with ESMTPS id E790210E00A; Mon, 4 Jul 2022 08:09:38 +0000 (UTC) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 65A0CB80DF2; Mon, 4 Jul 2022 08:09:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0664CC341CD; Mon, 4 Jul 2022 08:09:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1656922176; bh=06YFOWy5ci6Ny48R6RNGVBykXsXj0MvRxiXVVF8DTPE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Yy0qAlNtXVAGX0wBXJFMGzhJ8+MCbNo8U9DyoSrbGtZjpLs9Dw6b1RBFC4eRmv4Cl OmjeY2/sehbLyXjOyUFe0K16h/2Gc6qJebr1WyMIWl7yMTMW41GEJOjocyowsnW6to M+de7o4z1OrhVYyeLHb118weP6oGa9RyyzjDqKoWno5Va6VX3xgPOaAUlvvyPcxCMk JnFi2XSZ8BBEb/GsfwLf3GFnft6gYCZgY8Cyk2Tl1jGWudN7pR9nbQ1krZ4LNDQouu N2yxaOgKmxMFB7E/TYalKSWQfrn6AsEWtApNwqN1svpG/nFMLW9BZsazsRcu7wHW5m FkEnFjpYeC0wg== Received: from mchehab by mail.kernel.org with local (Exim 4.95) (envelope-from ) id 1o8H9A-009Oab-Si; Mon, 04 Jul 2022 09:09:32 +0100 From: Mauro Carvalho Chehab To: Date: Mon, 4 Jul 2022 09:09:29 +0100 Message-Id: <3ecc1f94290a66b2e682f956b5232b4903c32a2c.1656921701.git.mchehab@kernel.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: References: MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v3 2/2] drm/i915/gt: Serialize TLB invalidates with GT resets 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 , =?utf-8?q?Thomas_Hellstr=C3=B6m?= , David Airlie , dri-devel@lists.freedesktop.org, Lucas De Marchi , linux-kernel@vger.kernel.org, Chris Wilson , Rodrigo Vivi , Dave Airlie , stable@vger.kernel.org, Mauro Carvalho Chehab , intel-gfx@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Chris Wilson Avoid trying to invalidate the TLB in the middle of performing an engine reset, as this may result in the reset timing out. Currently, the TLB invalidate is only serialised by its own mutex, forgoing the uncore lock, but we can take the uncore->lock as well to serialise the mmio access, thereby serialising with the GDRST. Tested on a NUC5i7RYB, BIOS RYBDWi35.86A.0380.2019.0517.1530 with i915 selftest/hangcheck. Cc: stable@vger.kernel.org # Up to 4.4 Fixes: 7938d61591d3 ("drm/i915: Flush TLBs before releasing backing store") Reported-by: Mauro Carvalho Chehab Tested-by: Mauro Carvalho Chehab Reviewed-by: Mauro Carvalho Chehab Cc: Chris Wilson Cc: Tvrtko Ursulin Cc: Thomas Hellström Cc: Andi Shyti Signed-off-by: Mauro Carvalho Chehab Reviewed-by: Andi Shyti Reviewed-by: Andrzej Hajda --- To avoid mailbombing on a large number of people, only mailing lists were C/C on the cover. See [PATCH v3 0/2] at: https://lore.kernel.org/all/cover.1656921701.git.mchehab@kernel.org/ drivers/gpu/drm/i915/gt/intel_gt.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c index 8da3314bb6bf..68c2b0d8f187 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt.c +++ b/drivers/gpu/drm/i915/gt/intel_gt.c @@ -952,6 +952,20 @@ void intel_gt_invalidate_tlbs(struct intel_gt *gt) mutex_lock(>->tlb_invalidate_lock); intel_uncore_forcewake_get(uncore, FORCEWAKE_ALL); + spin_lock_irq(&uncore->lock); /* serialise invalidate with GT reset */ + + for_each_engine(engine, gt, id) { + struct reg_and_bit rb; + + rb = get_reg_and_bit(engine, regs == gen8_regs, regs, num); + if (!i915_mmio_reg_offset(rb.reg)) + continue; + + intel_uncore_write_fw(uncore, rb.reg, rb.bit); + } + + spin_unlock_irq(&uncore->lock); + for_each_engine(engine, gt, id) { /* * HW architecture suggest typical invalidation time at 40us, @@ -966,7 +980,6 @@ void intel_gt_invalidate_tlbs(struct intel_gt *gt) if (!i915_mmio_reg_offset(rb.reg)) continue; - intel_uncore_write_fw(uncore, rb.reg, rb.bit); if (__intel_wait_for_register_fw(uncore, rb.reg, rb.bit, 0, timeout_us, timeout_ms,