From patchwork Fri Oct 23 16:51:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 11854147 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8528214B2 for ; Fri, 23 Oct 2020 16:50:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 55C4A223EA for ; Fri, 23 Oct 2020 16:50:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="hsLeGd2H" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752741AbgJWQu2 (ORCPT ); Fri, 23 Oct 2020 12:50:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51680 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752740AbgJWQu0 (ORCPT ); Fri, 23 Oct 2020 12:50:26 -0400 Received: from mail-pg1-x544.google.com (mail-pg1-x544.google.com [IPv6:2607:f8b0:4864:20::544]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9F005C0613CE; Fri, 23 Oct 2020 09:50:24 -0700 (PDT) Received: by mail-pg1-x544.google.com with SMTP id i26so1354166pgl.5; Fri, 23 Oct 2020 09:50:24 -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=c/inxxNsLP/RHi0jt3kQtzdiSVyG/oJF9qir+FDcseM=; b=hsLeGd2HKA+sBwT2cYk7BvOcjycSvn8fR61BzoJygXTnwvt71pz3TY6gZvRNnnn5AS fHHiCOKREu9MdDjV17Ki2yytelTfxQav6EIq/LVZ102uJBQsVkAj9HMvfXzrACaZ6Z7t w/6azeOYGI9JxeipELpL/BcVs6R+wc1VpFNeHPUtOg9bmRdV8qT461rDdgHjVbp9EuYI WAhPU+jfYlWW9BktADmFqFJnt2DNLpr7Bn/Ghd0JlczsdoOjLBg6HuTeFuYJ6BMarUYq 6UMkMeV0FbY9Hp000J5/st8T0JqPO0ein1EAm8hpY1NjORALt2vhIpgXuArEimUECkPb ziEQ== 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=c/inxxNsLP/RHi0jt3kQtzdiSVyG/oJF9qir+FDcseM=; b=J8nHnFbAArXj08AUTVZ2uTNhal4wkNORgq6/2rYWWx8+vc9cQRxo9+XCZPJEVmrKJH fk3WjUF2TQh5Dx2KEZ+iyfpSxe+av+B9xYoocwcGNJ5RHXaG/a/XOyzhqv/LFtLZbf8u lFGXS9C9ERjs4DNam2fhf4zHZoNyo/KDnyBSO10uzEkZE5oUjnxdjuU9sdQYBKmE4q7L q/fN/MHKMd0ULBrvhm6nrbbDp9pAd2x1qiUbfdzebV4ye5Y4Obl8ndFaRiBiIpwl6f+m G8v0VFZIWdIxuRy6S0LuWtWaUW8R7RM+10QjLJqFbQawPVN9qe3hG6K4wxiRFJKUny+s ZM/g== X-Gm-Message-State: AOAM530N5nGSEZU1nHyq796p65T1xkut4zlKYEVRUa5lMgZlH+/wxROu TrSDqN2rHSpkbj5eUUpSsig= X-Google-Smtp-Source: ABdhPJyIECV5JuG+wdj7l/Sb80evcNTjX18GWDbsijKN9hIlfFmXvSbSfDleBN+DjcRVaUBlsHzZ4A== X-Received: by 2002:a62:5f47:0:b029:15c:e72a:4d32 with SMTP id t68-20020a625f470000b029015ce72a4d32mr53923pfb.67.1603471824107; Fri, 23 Oct 2020 09:50:24 -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 ge6sm3062454pjb.29.2020.10.23.09.50.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 23 Oct 2020 09:50:22 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Rob Clark , "Kristian H . Kristensen" , Rob Clark , Sean Paul , David Airlie , Daniel Vetter , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v4 06/23] drm/msm/gem: Move locking in shrinker path Date: Fri, 23 Oct 2020 09:51:07 -0700 Message-Id: <20201023165136.561680-7-robdclark@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201023165136.561680-1-robdclark@gmail.com> References: <20201023165136.561680-1-robdclark@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org 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 Reviewed-by: Kristian H. Kristensen --- 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..766ce278c74a 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(&msm_obj->lock) == 1; +} + 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)