From patchwork Mon Oct 12 02:09:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 269530 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C8C63C43457 for ; Mon, 12 Oct 2020 02:09:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8182420782 for ; Mon, 12 Oct 2020 02:09:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="pOPzTKYV" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729854AbgJLCJr (ORCPT ); Sun, 11 Oct 2020 22:09:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37226 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729819AbgJLCJk (ORCPT ); Sun, 11 Oct 2020 22:09:40 -0400 Received: from mail-pl1-x641.google.com (mail-pl1-x641.google.com [IPv6:2607:f8b0:4864:20::641]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E20D8C0613CE; Sun, 11 Oct 2020 19:09:39 -0700 (PDT) Received: by mail-pl1-x641.google.com with SMTP id w11so22583pll.8; Sun, 11 Oct 2020 19:09:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=aM7b0pwaJ3Kic6t5ul6vT7+G6Sk2C9laYoEYMRioRSw=; b=pOPzTKYVTMfn/vTZiKhTePR9dfuJ5aJjHeqFD2Vq5MeZMfeAaXaIiIAUSaR69PTSf3 B/UuIWCh1WvISMnFM7zeo9WIWjat7foLonk1dYlDEXaJJHMaaN1b5X92o71U5tsZpvtf OYb8TsEP/Adh39mEODcqhSAIdzkRVbLQKpp9mx7lJkeNjkDOOKIAth7f1acrkG8biPCu J+TNtU+EBlMRHQt7bqpZhbGF6oggkiynt149iL5udC7va/u4C4wB6XjvD+i0kzspy+JZ UfiHf6IdOFfQytGRqkdTXPJr4/u17dl+ekA21Gxb/cFuyKrsfzhJ0pKkmJq7Pv0s7wlM KNUQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=aM7b0pwaJ3Kic6t5ul6vT7+G6Sk2C9laYoEYMRioRSw=; b=LJ8mxJuNGvawPVpEXQdS2xf1QubdBqAcWzwClcfyy4JwyDxSNawOSvuiwCY7roRYh8 Mgb7UE4jqH0irXXYVc1VcctfIj5Ci4TQTivqUMNGgpGBc/E7yosPu05FPlMh3dEM6c4m AFceDiF9BnanC0X35Df5OEsoibZe32WohnVXBo7lKqBf8JhEFS8cx0xXi++f/5EI1UYd vd3r8o3ntgEh5veXb+WpI0UtWr+/4M4KHFVVVjNnb8R3bWH3gVFPI7FknKCSTewuWXNd yeZOc+ifCdfpTxnIm/ZnEk/jnzVsgrO5AXLvV1IJR5D+fB0anAzmLvq/Af6QbB8FLlwq grfg== X-Gm-Message-State: AOAM532S785Hrx6HXRecBLVDfUo7iMo3HmhYefhqy2mphbq19rfQ0ow7 lpDaJLMc1UnIrN3pihGDlFo= X-Google-Smtp-Source: ABdhPJw2DDnmYqy+aSPVa6Gk57Xifw79VHiFSVfIjhfOuGVCMllrvyE2SNen/jQ96sfk3SPxk3ZOyQ== X-Received: by 2002:a17:902:b18f:b029:d2:1ec0:4161 with SMTP id s15-20020a170902b18fb02900d21ec04161mr21604424plr.58.1602468579414; Sun, 11 Oct 2020 19:09:39 -0700 (PDT) Received: from localhost (c-73-25-156-94.hsd1.or.comcast.net. [73.25.156.94]) by smtp.gmail.com with ESMTPSA id cu5sm12696349pjb.49.2020.10.11.19.09.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 11 Oct 2020 19:09:38 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: Daniel Vetter , Rob Clark , Rob Clark , Sean Paul , David Airlie , linux-arm-msm@vger.kernel.org (open list:DRM DRIVER FOR MSM ADRENO GPU), freedreno@lists.freedesktop.org (open list:DRM DRIVER FOR MSM ADRENO GPU), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v2 21/22] drm/msm: Drop struct_mutex in shrinker path Date: Sun, 11 Oct 2020 19:09:48 -0700 Message-Id: <20201012020958.229288-22-robdclark@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201012020958.229288-1-robdclark@gmail.com> References: <20201012020958.229288-1-robdclark@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: Rob Clark Now that the inactive_list is protected by mm_lock, and everything else on per-obj basis is protected by obj->lock, we no longer depend on struct_mutex. Signed-off-by: Rob Clark --- drivers/gpu/drm/msm/msm_gem.c | 1 - drivers/gpu/drm/msm/msm_gem_shrinker.c | 54 -------------------------- 2 files changed, 55 deletions(-) diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c index 8852c05775dc..ca00c3ccd413 100644 --- a/drivers/gpu/drm/msm/msm_gem.c +++ b/drivers/gpu/drm/msm/msm_gem.c @@ -673,7 +673,6 @@ void msm_gem_purge(struct drm_gem_object *obj) struct drm_device *dev = obj->dev; struct msm_gem_object *msm_obj = to_msm_bo(obj); - WARN_ON(!mutex_is_locked(&dev->struct_mutex)); WARN_ON(!is_purgeable(msm_obj)); WARN_ON(obj->import_attach); diff --git a/drivers/gpu/drm/msm/msm_gem_shrinker.c b/drivers/gpu/drm/msm/msm_gem_shrinker.c index 6be073b8ca08..6f4b1355725f 100644 --- a/drivers/gpu/drm/msm/msm_gem_shrinker.c +++ b/drivers/gpu/drm/msm/msm_gem_shrinker.c @@ -8,48 +8,13 @@ #include "msm_gem.h" #include "msm_gpu_trace.h" -static bool msm_gem_shrinker_lock(struct drm_device *dev, bool *unlock) -{ - /* NOTE: we are *closer* to being able to get rid of - * mutex_trylock_recursive().. the msm_gem code itself does - * not need struct_mutex, although codepaths that can trigger - * shrinker are still called in code-paths that hold the - * struct_mutex. - * - * Also, msm_obj->madv is protected by struct_mutex. - * - * The next step is probably split out a seperate lock for - * protecting inactive_list, so that shrinker does not need - * struct_mutex. - */ - switch (mutex_trylock_recursive(&dev->struct_mutex)) { - case MUTEX_TRYLOCK_FAILED: - return false; - - case MUTEX_TRYLOCK_SUCCESS: - *unlock = true; - return true; - - case MUTEX_TRYLOCK_RECURSIVE: - *unlock = false; - return true; - } - - BUG(); -} - static unsigned long msm_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc) { struct msm_drm_private *priv = container_of(shrinker, struct msm_drm_private, shrinker); - struct drm_device *dev = priv->dev; struct msm_gem_object *msm_obj; unsigned long count = 0; - bool unlock; - - if (!msm_gem_shrinker_lock(dev, &unlock)) - return 0; mutex_lock(&priv->mm_lock); @@ -63,9 +28,6 @@ msm_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc) mutex_unlock(&priv->mm_lock); - if (unlock) - mutex_unlock(&dev->struct_mutex); - return count; } @@ -74,13 +36,8 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc) { struct msm_drm_private *priv = container_of(shrinker, struct msm_drm_private, shrinker); - struct drm_device *dev = priv->dev; struct msm_gem_object *msm_obj; unsigned long freed = 0; - bool unlock; - - if (!msm_gem_shrinker_lock(dev, &unlock)) - return SHRINK_STOP; mutex_lock(&priv->mm_lock); @@ -98,9 +55,6 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc) mutex_unlock(&priv->mm_lock); - if (unlock) - mutex_unlock(&dev->struct_mutex); - if (freed > 0) trace_msm_gem_purge(freed << PAGE_SHIFT); @@ -112,13 +66,8 @@ msm_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr) { struct msm_drm_private *priv = container_of(nb, struct msm_drm_private, vmap_notifier); - struct drm_device *dev = priv->dev; struct msm_gem_object *msm_obj; unsigned unmapped = 0; - bool unlock; - - if (!msm_gem_shrinker_lock(dev, &unlock)) - return NOTIFY_DONE; mutex_lock(&priv->mm_lock); @@ -141,9 +90,6 @@ msm_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr) mutex_unlock(&priv->mm_lock); - if (unlock) - mutex_unlock(&dev->struct_mutex); - *(unsigned long *)ptr += unmapped; if (unmapped > 0)