From patchwork Tue Jul 12 15:21:32 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: 12915206 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 19F97C43334 for ; Tue, 12 Jul 2022 15:21:52 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 83A2094F80; Tue, 12 Jul 2022 15:21:42 +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 81CE694F6F; Tue, 12 Jul 2022 15:21:40 +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 F1529B819CD; Tue, 12 Jul 2022 15:21:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A30F9C341C0; Tue, 12 Jul 2022 15:21:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1657639297; bh=7JnyFsglCKgFnoItNxfBpbbgyPgOiVtVYUylqa7lLqM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Z/YEuO5SX4PTs+sp5WIGVxTNqqJe51Do5DJXh+ohvG2WiWAktSFBoswQhVqDPLx5m V2U/TfN8+RgCMMwtaMru8vyYTvnzcw/Uwpt3M+PmYXoP5HNqdsD5tjxN/r7qKVoQB7 Kz6TGyiamqPCffVy8RquBNZ2RIXlVUKYZVvw6v7WR7EdXH4wjRUYgQtqL2FXBRs57C xdXKd8/W6l5EfiWr0CDuB1EjfJcI+ghh7t98DIO9l9aDOSNJmz3t86viR16COE5OMl 2ngLhPyvj2Dj8wieO1Piu25szmtVjPjiLk7ckZiVaM2zW88yidvIgj2aadchVrYziz 32plUU+1lJCSg== Received: from mchehab by mail.kernel.org with local (Exim 4.95) (envelope-from ) id 1oBHhe-004k23-Ao; Tue, 12 Jul 2022 16:21:34 +0100 From: Mauro Carvalho Chehab To: Date: Tue, 12 Jul 2022 16:21:32 +0100 Message-Id: X-Mailer: git-send-email 2.36.1 In-Reply-To: References: MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v5 1/2] drm/i915/gt: Serialize GRDOM access between multiple engine 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: David Airlie , dri-devel@lists.freedesktop.org, Chris Wilson , Andrzej Hajda , =?utf-8?q?Thomas_Hellstr=C3=B6m?= , Andi Shyti , intel-gfx@lists.freedesktop.org, Rodrigo Vivi , Mauro Carvalho Chehab , linux-kernel@vger.kernel.org, stable@vger.kernel.org, Tejas Upadhyay Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Chris Wilson Don't allow two engines to be reset in parallel, as they would both try to select a reset bit (and send requests to common registers) and wait on that register, at the same time. Serialize control of the reset requests/acks using the uncore->lock, which will also ensure that no other GT state changes at the same time as the actual reset. Cc: stable@vger.kernel.org # v4.4 and upper Reported-by: Mika Kuoppala Signed-off-by: Chris Wilson Acked-by: Mika Kuoppala Reviewed-by: Andi Shyti Reviewed-by: Andrzej Hajda Acked-by: Thomas Hellström Signed-off-by: Mauro Carvalho Chehab --- See [PATCH v5 0/2] at: https://lore.kernel.org/all/cover.1657639152.git.mchehab@kernel.org/ drivers/gpu/drm/i915/gt/intel_reset.c | 37 ++++++++++++++++++++------- 1 file changed, 28 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/intel_reset.c b/drivers/gpu/drm/i915/gt/intel_reset.c index a5338c3fde7a..c68d36fb5bbd 100644 --- a/drivers/gpu/drm/i915/gt/intel_reset.c +++ b/drivers/gpu/drm/i915/gt/intel_reset.c @@ -300,9 +300,9 @@ static int gen6_hw_domain_reset(struct intel_gt *gt, u32 hw_domain_mask) return err; } -static int gen6_reset_engines(struct intel_gt *gt, - intel_engine_mask_t engine_mask, - unsigned int retry) +static int __gen6_reset_engines(struct intel_gt *gt, + intel_engine_mask_t engine_mask, + unsigned int retry) { struct intel_engine_cs *engine; u32 hw_mask; @@ -321,6 +321,20 @@ static int gen6_reset_engines(struct intel_gt *gt, return gen6_hw_domain_reset(gt, hw_mask); } +static int gen6_reset_engines(struct intel_gt *gt, + intel_engine_mask_t engine_mask, + unsigned int retry) +{ + unsigned long flags; + int ret; + + spin_lock_irqsave(>->uncore->lock, flags); + ret = __gen6_reset_engines(gt, engine_mask, retry); + spin_unlock_irqrestore(>->uncore->lock, flags); + + return ret; +} + static struct intel_engine_cs *find_sfc_paired_vecs_engine(struct intel_engine_cs *engine) { int vecs_id; @@ -487,9 +501,9 @@ static void gen11_unlock_sfc(struct intel_engine_cs *engine) rmw_clear_fw(uncore, sfc_lock.lock_reg, sfc_lock.lock_bit); } -static int gen11_reset_engines(struct intel_gt *gt, - intel_engine_mask_t engine_mask, - unsigned int retry) +static int __gen11_reset_engines(struct intel_gt *gt, + intel_engine_mask_t engine_mask, + unsigned int retry) { struct intel_engine_cs *engine; intel_engine_mask_t tmp; @@ -583,8 +597,11 @@ static int gen8_reset_engines(struct intel_gt *gt, struct intel_engine_cs *engine; const bool reset_non_ready = retry >= 1; intel_engine_mask_t tmp; + unsigned long flags; int ret; + spin_lock_irqsave(>->uncore->lock, flags); + for_each_engine_masked(engine, gt, engine_mask, tmp) { ret = gen8_engine_reset_prepare(engine); if (ret && !reset_non_ready) @@ -612,17 +629,19 @@ static int gen8_reset_engines(struct intel_gt *gt, * This is best effort, so ignore any error from the initial reset. */ if (IS_DG2(gt->i915) && engine_mask == ALL_ENGINES) - gen11_reset_engines(gt, gt->info.engine_mask, 0); + __gen11_reset_engines(gt, gt->info.engine_mask, 0); if (GRAPHICS_VER(gt->i915) >= 11) - ret = gen11_reset_engines(gt, engine_mask, retry); + ret = __gen11_reset_engines(gt, engine_mask, retry); else - ret = gen6_reset_engines(gt, engine_mask, retry); + ret = __gen6_reset_engines(gt, engine_mask, retry); skip_reset: for_each_engine_masked(engine, gt, engine_mask, tmp) gen8_engine_reset_cancel(engine); + spin_unlock_irqrestore(>->uncore->lock, flags); + return ret; }