From patchwork Mon Oct 19 20:46:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 11845171 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=-12.3 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,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 B5D89C4363D for ; Mon, 19 Oct 2020 20:45:46 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 494B322404 for ; Mon, 19 Oct 2020 20:45:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="cPdWqqA+" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 494B322404 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 850936EAA0; Mon, 19 Oct 2020 20:45:45 +0000 (UTC) Received: from mail-pl1-x641.google.com (mail-pl1-x641.google.com [IPv6:2607:f8b0:4864:20::641]) by gabe.freedesktop.org (Postfix) with ESMTPS id EF7ED6EAA0; Mon, 19 Oct 2020 20:45:43 +0000 (UTC) Received: by mail-pl1-x641.google.com with SMTP id t18so434363plo.1; Mon, 19 Oct 2020 13:45:43 -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=heNnLATWWWZ7SExL62Bdg0BvXOx79+g5dVu5lFw7nAE=; b=cPdWqqA+q9J617UXy1CtehpGWRzBmdxD9pwj+TufvgDL2pCVBVuXdytjYDdayd9d56 /OD/dS1jTghH0XVEFFCVo5gNhHbUdh1b1V9d4Uof7RwPWeku7jaDeGKAWStQeiw1VhQH pMBD9vRXMcUTL9UNb+xUXh/g/EpzNlDJhMx7E9JNEwPQKdHvRDMf47qZvWlAaOJuFcvH a93V+1RguqjDKuzxYAGFIrGQGp6gqCK7O+6g8/5JYq57nZWBdTdPQQOdOt9E0D40YjFH x3xkW4BcRd4TdvKggd1rQTdjSK4LXIkLSLNwDOOyscWstlPlWXmIeDfI/0YcNDbfCNmj zDSw== 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=heNnLATWWWZ7SExL62Bdg0BvXOx79+g5dVu5lFw7nAE=; b=ikzpfcylaaWdwbfdHuBje41S5WqKZR7PFfMGrDtWP6lnKkQdSnwCYnjHjh6xGFLzf9 GhBupDfheMvXVUL9sCBFevUie29sid8f/RvMiDjDxwh2cQoivCfaVy5ZVdUO76zphzCk GzaujYuvISHEp9rIoUBshLDw3pAYRP+CX4n+ONQ/2N3AbnFsHsQWHoRAGnXtAITjsR/+ YE6rXyo6GyhnkZXbf5nbvbYC/xecPZ/stP9ZgtpNvYpzS8kldnTwqV7xwO2kSu7A5iyj AbpWT0661GXy0x0nHluObz0DYotdZeTSbvR+BOyDZzGJyCGzcBzs7tJ6tengseQNzQho T2qA== X-Gm-Message-State: AOAM532+YMsDJHNyLjPzzlX2WRZ9esDSWrovaJOkSbGgKihKOfO4dmSS lu4gVqBaQdFNZxvG13oC9XtQLp1I0PvVww== X-Google-Smtp-Source: ABdhPJxKfRVbe06HVzfhNhHxlfx+9V1bH7przPUm2ipBmERFnvcD/Zo2UFNehmDliVI8xcU24nOpHw== X-Received: by 2002:a17:90a:8c17:: with SMTP id a23mr1203055pjo.112.1603140342852; Mon, 19 Oct 2020 13:45:42 -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 az18sm332262pjb.35.2020.10.19.13.45.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Oct 2020 13:45:41 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Subject: [PATCH v3 06/23] drm/msm/gem: Move locking in shrinker path Date: Mon, 19 Oct 2020 13:46:07 -0700 Message-Id: <20201019204636.139997-7-robdclark@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201019204636.139997-1-robdclark@gmail.com> References: <20201019204636.139997-1-robdclark@gmail.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rob Clark , "open list:DRM DRIVER FOR MSM ADRENO GPU" , David Airlie , "open list:DRM DRIVER FOR MSM ADRENO GPU" , open list , Sean Paul Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Rob Clark Move grabbing the bo lock into shrinker, with a msm_gem_trylock() to skip over bo's that are already locked. This gets rid of the nested lock classes. Signed-off-by: Rob Clark --- drivers/gpu/drm/msm/msm_gem.c | 24 +++++---------------- drivers/gpu/drm/msm/msm_gem.h | 29 ++++++++++---------------- drivers/gpu/drm/msm/msm_gem_shrinker.c | 27 +++++++++++++++++------- 3 files changed, 35 insertions(+), 45 deletions(-) diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c index e0d8d739b068..1195847714ba 100644 --- a/drivers/gpu/drm/msm/msm_gem.c +++ b/drivers/gpu/drm/msm/msm_gem.c @@ -17,8 +17,6 @@ #include "msm_gpu.h" #include "msm_mmu.h" -static void msm_gem_vunmap_locked(struct drm_gem_object *obj); - static dma_addr_t physaddr(struct drm_gem_object *obj) { @@ -693,20 +691,19 @@ int msm_gem_madvise(struct drm_gem_object *obj, unsigned madv) return (madv != __MSM_MADV_PURGED); } -void msm_gem_purge(struct drm_gem_object *obj, enum msm_gem_lock subclass) +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(!msm_gem_is_locked(obj)); WARN_ON(!is_purgeable(msm_obj)); WARN_ON(obj->import_attach); - mutex_lock_nested(&msm_obj->lock, subclass); - put_iova(obj); - msm_gem_vunmap_locked(obj); + msm_gem_vunmap(obj); put_pages(obj); @@ -724,11 +721,9 @@ void msm_gem_purge(struct drm_gem_object *obj, enum msm_gem_lock subclass) invalidate_mapping_pages(file_inode(obj->filp)->i_mapping, 0, (loff_t)-1); - - msm_gem_unlock(obj); } -static void msm_gem_vunmap_locked(struct drm_gem_object *obj) +void msm_gem_vunmap(struct drm_gem_object *obj) { struct msm_gem_object *msm_obj = to_msm_bo(obj); @@ -741,15 +736,6 @@ static void msm_gem_vunmap_locked(struct drm_gem_object *obj) msm_obj->vaddr = NULL; } -void msm_gem_vunmap(struct drm_gem_object *obj, enum msm_gem_lock subclass) -{ - struct msm_gem_object *msm_obj = to_msm_bo(obj); - - mutex_lock_nested(&msm_obj->lock, subclass); - msm_gem_vunmap_locked(obj); - msm_gem_unlock(obj); -} - /* must be called before _move_to_active().. */ int msm_gem_sync_object(struct drm_gem_object *obj, struct msm_fence_context *fctx, bool exclusive) @@ -986,7 +972,7 @@ static void free_object(struct msm_gem_object *msm_obj) drm_prime_gem_destroy(obj, msm_obj->sgt); } else { - msm_gem_vunmap_locked(obj); + msm_gem_vunmap(obj); put_pages(obj); } diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h index d55d5401a2d2..c5232b8da794 100644 --- a/drivers/gpu/drm/msm/msm_gem.h +++ b/drivers/gpu/drm/msm/msm_gem.h @@ -162,6 +162,13 @@ msm_gem_lock(struct drm_gem_object *obj) mutex_lock(&msm_obj->lock); } +static inline bool __must_check +msm_gem_trylock(struct drm_gem_object *obj) +{ + struct msm_gem_object *msm_obj = to_msm_bo(obj); + return mutex_trylock_recursive(&msm_obj->lock) == MUTEX_TRYLOCK_SUCCESS; +} + static inline int msm_gem_lock_interruptible(struct drm_gem_object *obj) { @@ -190,6 +197,7 @@ static inline bool is_active(struct msm_gem_object *msm_obj) static inline bool is_purgeable(struct msm_gem_object *msm_obj) { + WARN_ON(!msm_gem_is_locked(&msm_obj->base)); WARN_ON(!mutex_is_locked(&msm_obj->base.dev->struct_mutex)); return (msm_obj->madv == MSM_MADV_DONTNEED) && msm_obj->sgt && !msm_obj->base.dma_buf && !msm_obj->base.import_attach; @@ -197,27 +205,12 @@ static inline bool is_purgeable(struct msm_gem_object *msm_obj) static inline bool is_vunmapable(struct msm_gem_object *msm_obj) { + WARN_ON(!msm_gem_is_locked(&msm_obj->base)); return (msm_obj->vmap_count == 0) && msm_obj->vaddr; } -/* The shrinker can be triggered while we hold objA->lock, and need - * to grab objB->lock to purge it. Lockdep just sees these as a single - * class of lock, so we use subclasses to teach it the difference. - * - * OBJ_LOCK_NORMAL is implicit (ie. normal mutex_lock() call), and - * OBJ_LOCK_SHRINKER is used by shrinker. - * - * It is *essential* that we never go down paths that could trigger the - * shrinker for a purgable object. This is ensured by checking that - * msm_obj->madv == MSM_MADV_WILLNEED. - */ -enum msm_gem_lock { - OBJ_LOCK_NORMAL, - OBJ_LOCK_SHRINKER, -}; - -void msm_gem_purge(struct drm_gem_object *obj, enum msm_gem_lock subclass); -void msm_gem_vunmap(struct drm_gem_object *obj, enum msm_gem_lock subclass); +void msm_gem_purge(struct drm_gem_object *obj); +void msm_gem_vunmap(struct drm_gem_object *obj); void msm_gem_free_work(struct work_struct *work); /* Created per submit-ioctl, to track bo's and cmdstream bufs, etc, diff --git a/drivers/gpu/drm/msm/msm_gem_shrinker.c b/drivers/gpu/drm/msm/msm_gem_shrinker.c index 482576d7a39a..2dc0ffa925b4 100644 --- a/drivers/gpu/drm/msm/msm_gem_shrinker.c +++ b/drivers/gpu/drm/msm/msm_gem_shrinker.c @@ -52,8 +52,11 @@ msm_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc) return 0; list_for_each_entry(msm_obj, &priv->inactive_list, mm_list) { + if (!msm_gem_trylock(&msm_obj->base)) + continue; if (is_purgeable(msm_obj)) count += msm_obj->base.size >> PAGE_SHIFT; + msm_gem_unlock(&msm_obj->base); } if (unlock) @@ -78,10 +81,13 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc) list_for_each_entry(msm_obj, &priv->inactive_list, mm_list) { if (freed >= sc->nr_to_scan) break; + if (!msm_gem_trylock(&msm_obj->base)) + continue; if (is_purgeable(msm_obj)) { - msm_gem_purge(&msm_obj->base, OBJ_LOCK_SHRINKER); + msm_gem_purge(&msm_obj->base); freed += msm_obj->base.size >> PAGE_SHIFT; } + msm_gem_unlock(&msm_obj->base); } if (unlock) @@ -107,15 +113,20 @@ msm_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr) return NOTIFY_DONE; list_for_each_entry(msm_obj, &priv->inactive_list, mm_list) { + if (!msm_gem_trylock(&msm_obj->base)) + continue; if (is_vunmapable(msm_obj)) { - msm_gem_vunmap(&msm_obj->base, OBJ_LOCK_SHRINKER); - /* since we don't know any better, lets bail after a few - * and if necessary the shrinker will be invoked again. - * Seems better than unmapping *everything* - */ - if (++unmapped >= 15) - break; + msm_gem_vunmap(&msm_obj->base); + unmapped++; } + msm_gem_unlock(&msm_obj->base); + + /* since we don't know any better, lets bail after a few + * and if necessary the shrinker will be invoked again. + * Seems better than unmapping *everything* + */ + if (++unmapped >= 15) + break; } if (unlock)