From patchwork Mon Jul 24 09:43:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 13323967 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 20D0AC0015E for ; Mon, 24 Jul 2023 09:55:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232599AbjGXJz5 (ORCPT ); Mon, 24 Jul 2023 05:55:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53306 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230479AbjGXJzA (ORCPT ); Mon, 24 Jul 2023 05:55:00 -0400 Received: from mail-pf1-x42a.google.com (mail-pf1-x42a.google.com [IPv6:2607:f8b0:4864:20::42a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 49978559F for ; Mon, 24 Jul 2023 02:50:52 -0700 (PDT) Received: by mail-pf1-x42a.google.com with SMTP id d2e1a72fcca58-682ae5d4184so1050761b3a.1 for ; Mon, 24 Jul 2023 02:50:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1690192215; x=1690797015; 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=9Za/Hz+nmH3G3JzZh25LzFiu0ZOWgA3znFTLEp4oxTw=; b=TTf56LOI5OBmt1tspo03rWh3xBEr3hHH9TqsTQuX6sVPLb6a6Ed8w7kGwyEZluV1cY qMZi+G6Q48p6D/Smwm1blyZ3aySnfCSQhK+AL6GcFSXasqkXIAFMoEVENh8tAZ3AVFN2 7LgPx4lJO0Y5pGgKk7E7MSanHhRz9REMkIJlK6m8Lnx02gGqSSb3cwo8A8XO/ti5qrB5 unEL7MxeizmqIfn6fA1NeHnYE2m23u4Vz1EUpHKL5MypxAUI2oXkCh4W6yBbPK66Kf3u O5WsokTw15qdxfn0jHlrbnPzcPXzk98/liLfXiNM1E2+9CwfjxqlrsApDzfIoKvsTDi0 hV7g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690192215; x=1690797015; 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=9Za/Hz+nmH3G3JzZh25LzFiu0ZOWgA3znFTLEp4oxTw=; b=HWMY7RNWfDnAHLkW/K+ejRJxjifMHZTmrniXHyC1MD/Wkf4d2bn9ZHIOcM4IyCjN7J hZW+oR7OeWrqecqbw3G82G4K1faJHuouZDW84ArPqB/XFPuYSHXZGtEDQSP6502C8xI2 zNxjZHGaiKSfLQYeYLizQgQFN7jPWPUVh5ouxRrqbg+pSH17hnY8HKTZr4KzFv6iU9nl mC543y4KfAAdaSp6BUIexyhzaNAxQFLQo6ecIvEgE1M6oOVGm/mybHO1dpQhoBtAw8L+ R3UagAJZ4/ZLEZz9Z3/Zq7fL5sTnQdYHEJh92Mb85AO1JjUA/70qOMWScj0+qpn41QlL EwfQ== X-Gm-Message-State: ABy/qLaLinGqU/10CRm4oG7IE4fPNI0rceBnHRK0qLYNii0zeqwNtXGS wByfHGDY+2FdJP805UXvAzKPmecHlPfIllhYGQc= X-Google-Smtp-Source: APBJJlFYiQjYsesoLBIGYzIbaqvqBpGNnPrMVt+9gbe/8vvXchqG9OkxYsLP3NQiA5NgJtO6rGDrrQ== X-Received: by 2002:a17:902:e80a:b0:1b8:50a9:6874 with SMTP id u10-20020a170902e80a00b001b850a96874mr12325717plg.5.1690192194956; Mon, 24 Jul 2023 02:49:54 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.147]) by smtp.gmail.com with ESMTPSA id d5-20020a170902c18500b001bb20380bf2sm8467233pld.13.2023.07.24.02.49.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Jul 2023 02:49:54 -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, steven.price@arm.com, cel@kernel.org, senozhatsky@chromium.org, yujie.liu@intel.com, gregkh@linuxfoundation.org, muchun.song@linux.dev Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, linux-erofs@lists.ozlabs.org, linux-f2fs-devel@lists.sourceforge.net, cluster-devel@redhat.com, linux-nfs@vger.kernel.org, linux-mtd@lists.infradead.org, rcu@vger.kernel.org, netdev@vger.kernel.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-xfs@vger.kernel.org, linux-btrfs@vger.kernel.org, Qi Zheng Subject: [PATCH v2 24/47] drm/panfrost: dynamically allocate the drm-panfrost shrinker Date: Mon, 24 Jul 2023 17:43:31 +0800 Message-Id: <20230724094354.90817-25-zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20230724094354.90817-1-zhengqi.arch@bytedance.com> References: <20230724094354.90817-1-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, use new APIs 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 Reviewed-by: Steven Price --- drivers/gpu/drm/panfrost/panfrost_device.h | 2 +- drivers/gpu/drm/panfrost/panfrost_drv.c | 6 +++- drivers/gpu/drm/panfrost/panfrost_gem.h | 2 +- .../gpu/drm/panfrost/panfrost_gem_shrinker.c | 32 ++++++++++++------- 4 files changed, 27 insertions(+), 15 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_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c index bbada731bbbd..f705bbdea360 100644 --- a/drivers/gpu/drm/panfrost/panfrost_drv.c +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c @@ -598,10 +598,14 @@ static int panfrost_probe(struct platform_device *pdev) if (err < 0) goto err_out1; - panfrost_gem_shrinker_init(ddev); + err = panfrost_gem_shrinker_init(ddev); + if (err) + goto err_out2; return 0; +err_out2: + drm_dev_unregister(ddev); err_out1: pm_runtime_disable(pfdev->dev); panfrost_device_fini(pfdev); diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.h b/drivers/gpu/drm/panfrost/panfrost_gem.h index ad2877eeeccd..863d2ec8d4f0 100644 --- a/drivers/gpu/drm/panfrost/panfrost_gem.h +++ b/drivers/gpu/drm/panfrost/panfrost_gem.h @@ -81,7 +81,7 @@ panfrost_gem_mapping_get(struct panfrost_gem_object *bo, void panfrost_gem_mapping_put(struct panfrost_gem_mapping *mapping); void panfrost_gem_teardown_mappings_locked(struct panfrost_gem_object *bo); -void panfrost_gem_shrinker_init(struct drm_device *dev); +int panfrost_gem_shrinker_init(struct drm_device *dev); void panfrost_gem_shrinker_cleanup(struct drm_device *dev); #endif /* __PANFROST_GEM_H__ */ diff --git a/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c b/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c index bf0170782f25..9a90dfb5301f 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; @@ -97,13 +95,24 @@ panfrost_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc) * * This function registers and sets up the panfrost shrinker. */ -void panfrost_gem_shrinker_init(struct drm_device *dev) +int 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(0, "drm-panfrost"); + if (!pfdev->shrinker) { + WARN_ON(1); + return -ENOMEM; + } + + pfdev->shrinker->count_objects = panfrost_gem_shrinker_count; + pfdev->shrinker->scan_objects = panfrost_gem_shrinker_scan; + pfdev->shrinker->seeks = DEFAULT_SEEKS; + pfdev->shrinker->private_data = pfdev; + + shrinker_register(pfdev->shrinker); + + return 0; } /** @@ -116,7 +125,6 @@ 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) + shrinker_unregister(pfdev->shrinker); }