From patchwork Thu Jun 22 08:53:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 13288637 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F308BC001DD for ; Thu, 22 Jun 2023 08:56:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231458AbjFVI4N (ORCPT ); Thu, 22 Jun 2023 04:56:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37648 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231463AbjFVIzP (ORCPT ); Thu, 22 Jun 2023 04:55:15 -0400 Received: from mail-pl1-x62b.google.com (mail-pl1-x62b.google.com [IPv6:2607:f8b0:4864:20::62b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C16C3212E for ; Thu, 22 Jun 2023 01:54:43 -0700 (PDT) Received: by mail-pl1-x62b.google.com with SMTP id d9443c01a7336-1b515ec39feso12619075ad.0 for ; Thu, 22 Jun 2023 01:54:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1687424083; x=1690016083; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=TQaNNe8oXaUFeFpLguh+yca1iGAODo9pDL1sZw6pJSE=; b=bLkRMM1jSdqXsEty9KLAFC9vFSq6Mb8s85EPujNxx1fG7cL+WhObUy7eJvjIIVVT27 Kiy5rsYxFdvQkjX/Hn7QfCF/H515sUldxTAV8THo6pKuerK5LdnjnrVU9ezaWAUUfrz8 rV0yX1ewF3SUu27Tytlc8UIGxdmoc2rf5KwQXmt4TN0xZENUrrBpDEpOBdYckFOGmW+/ CnWb/ghzLgegjrSPuJYmDsQVFRVYxO2XxU7X4C2jxwq5osf5N5i/+CYLyq1fNxhJsVCX q//piIl1OJNIHjgKTj8Fx/a4slkfZ5A+zdUvxvyRJBR/16JSIqSsZUTa9z9xdPFzC7nq BhVg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687424083; x=1690016083; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=TQaNNe8oXaUFeFpLguh+yca1iGAODo9pDL1sZw6pJSE=; b=ijJeTFCqxEty2uoX5Rs+TntYw3AQh6xD6cOXz0urrrhuIYwyIPhNqAYVGaeanrgwIW PROckj9GN3IjYn0G4ib7OFqNLlH3sABapNKhd7J/ru3pJ1JqVsIEFBDjtzm43a6pLq1y Ll5sEcq4w82/I0dVnGxNhibldYIucIBBKKF41ymZQLfQNL1+BZYItXPo+P/lOd8NCbTZ hia/DDt3Z8FE/BuYycTaomQt+/l2zk0AToU92CWK7gdSRBUjz3ycY5w2bGBOA3Qy+fpE +SYvQkGbZhq9uSKReKf6fTNPlWtwH6F1Fd6eEGLdxpT2gQl/aIDfgqwMbQzZLgiWNG8l dZ5A== X-Gm-Message-State: AC+VfDzV6s8Jv7dwlSV/w42oOQWEOJBqQqFFidJHj4nn/+9yiBv2VypR 5+m1uo4Oh7mYKkNCbAbC6UPFYw== X-Google-Smtp-Source: ACHHUZ6gH/Pv0NlMjwBsqv6k+8Uik3ghEf6lWW7kovYDQCKB++KLEA1PTcfQABA8HOR66RClg4yAXA== X-Received: by 2002:a17:903:32c4:b0:1b0:3cda:6351 with SMTP id i4-20020a17090332c400b001b03cda6351mr21555341plr.0.1687424083229; Thu, 22 Jun 2023 01:54:43 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([139.177.225.254]) by smtp.gmail.com with ESMTPSA id h2-20020a170902f7c200b001b549fce345sm4806971plw.230.2023.06.22.01.54.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Jun 2023 01:54:42 -0700 (PDT) From: Qi Zheng To: akpm@linux-foundation.org, david@fromorbit.com, tkhai@ya.ru, vbabka@suse.cz, roman.gushchin@linux.dev, djwong@kernel.org, brauner@kernel.org, paulmck@kernel.org, tytso@mit.edu Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, dm-devel@redhat.com, linux-raid@vger.kernel.org, linux-bcache@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-nfs@vger.kernel.org, linux-xfs@vger.kernel.org, linux-btrfs@vger.kernel.org, Qi Zheng Subject: [PATCH 05/29] drm/panfrost: dynamically allocate the drm-panfrost shrinker Date: Thu, 22 Jun 2023 16:53:11 +0800 Message-Id: <20230622085335.77010-6-zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20230622085335.77010-1-zhengqi.arch@bytedance.com> References: <20230622085335.77010-1-zhengqi.arch@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org In preparation for implementing lockless slab shrink, we need to dynamically allocate the drm-panfrost shrinker, so that it can be freed asynchronously using kfree_rcu(). Then it doesn't need to wait for RCU read-side critical section when releasing the struct panfrost_device. Signed-off-by: Qi Zheng --- drivers/gpu/drm/panfrost/panfrost_device.h | 2 +- .../gpu/drm/panfrost/panfrost_gem_shrinker.c | 24 ++++++++++--------- 2 files changed, 14 insertions(+), 12 deletions(-) diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h index b0126b9fbadc..e667e5689353 100644 --- a/drivers/gpu/drm/panfrost/panfrost_device.h +++ b/drivers/gpu/drm/panfrost/panfrost_device.h @@ -118,7 +118,7 @@ struct panfrost_device { struct mutex shrinker_lock; struct list_head shrinker_list; - struct shrinker shrinker; + struct shrinker *shrinker; struct panfrost_devfreq pfdevfreq; }; diff --git a/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c b/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c index bf0170782f25..2a5513eb9e1f 100644 --- a/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c +++ b/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c @@ -18,8 +18,7 @@ static unsigned long panfrost_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc) { - struct panfrost_device *pfdev = - container_of(shrinker, struct panfrost_device, shrinker); + struct panfrost_device *pfdev = shrinker->private_data; struct drm_gem_shmem_object *shmem; unsigned long count = 0; @@ -65,8 +64,7 @@ static bool panfrost_gem_purge(struct drm_gem_object *obj) static unsigned long panfrost_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc) { - struct panfrost_device *pfdev = - container_of(shrinker, struct panfrost_device, shrinker); + struct panfrost_device *pfdev = shrinker->private_data; struct drm_gem_shmem_object *shmem, *tmp; unsigned long freed = 0; @@ -100,10 +98,15 @@ panfrost_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc) void panfrost_gem_shrinker_init(struct drm_device *dev) { struct panfrost_device *pfdev = dev->dev_private; - pfdev->shrinker.count_objects = panfrost_gem_shrinker_count; - pfdev->shrinker.scan_objects = panfrost_gem_shrinker_scan; - pfdev->shrinker.seeks = DEFAULT_SEEKS; - WARN_ON(register_shrinker(&pfdev->shrinker, "drm-panfrost")); + + pfdev->shrinker = shrinker_alloc_and_init(panfrost_gem_shrinker_count, + panfrost_gem_shrinker_scan, 0, + DEFAULT_SEEKS, 0, pfdev); + if (pfdev->shrinker && + register_shrinker(pfdev->shrinker, "drm-panfrost")) { + shrinker_free(pfdev->shrinker); + WARN_ON(1); + } } /** @@ -116,7 +119,6 @@ void panfrost_gem_shrinker_cleanup(struct drm_device *dev) { struct panfrost_device *pfdev = dev->dev_private; - if (pfdev->shrinker.nr_deferred) { - unregister_shrinker(&pfdev->shrinker); - } + if (pfdev->shrinker->nr_deferred) + unregister_and_free_shrinker(pfdev->shrinker); }