From patchwork Mon Feb 27 06:02:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Osipenko X-Patchwork-Id: 13152871 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id D6984C7EE2E for ; Mon, 27 Feb 2023 06:03:28 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A2BC710E35C; Mon, 27 Feb 2023 06:03:19 +0000 (UTC) Received: from madras.collabora.co.uk (madras.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e5ab]) by gabe.freedesktop.org (Postfix) with ESMTPS id C771310E195 for ; Mon, 27 Feb 2023 06:03:07 +0000 (UTC) Received: from workpc.. (109-252-117-89.nat.spd-mgts.ru [109.252.117.89]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: dmitry.osipenko) by madras.collabora.co.uk (Postfix) with ESMTPSA id 44E546602E9A; Mon, 27 Feb 2023 06:03:05 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1677477786; bh=XYpYU9OXzB849UVK0XnujuvkGigsxcpf7YU8idExx+U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KXniX/89Mo+vyeos59JdCdzl4r8oHc41Po698xHiwNjaqfA169grjGSKavVQjLNQo rcGzcVz7LevMEAVn6ey5Hs+fjWnzcfeNPl+oAna5mTJaKDmaxlsHJPeNTDKFZCnqgj V+qzh+Y/2CRUTnoRRaTj3HztTxRukdSEMz4DWTth8+3bOVAGaE5aNmJVzU9FaHcnvC yprz5aYYSEWM4UsYFWnLFLHpesG0FtR9rZ4eMRLVAKQQpnKQLednNiyws02DiDN3L7 vUvLcC6a1PEh1A0lg+fyvYligUAWLgX3/egR6em+dtgtZe9K+WJWH2qAaeYuWZ55Fi Aw/HBI9/zzbQQ== From: Dmitry Osipenko To: David Airlie , Gerd Hoffmann , Gurchetan Singh , Chia-I Wu , Daniel Vetter , Daniel Almeida , Gustavo Padovan , Daniel Stone , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Sumit Semwal , =?utf-8?q?Christian_K=C3=B6nig?= , Qiang Yu , Steven Price , Alyssa Rosenzweig , Rob Herring Subject: [PATCH v11 02/10] drm/shmem-helper: Add pages_pin_count field Date: Mon, 27 Feb 2023 09:02:11 +0300 Message-Id: <20230227060219.904986-3-dmitry.osipenko@collabora.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230227060219.904986-1-dmitry.osipenko@collabora.com> References: <20230227060219.904986-1-dmitry.osipenko@collabora.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: kernel@collabora.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, virtualization@lists.linux-foundation.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" And new pages_pin_count field to struct drm_gem_shmem_object that will determine whether pages are evictable by memory shrinker. The pages will be evictable only when pages_pin_count=0. This patch prepares code for addition of the memory shrinker that will utilize the new field. Signed-off-by: Dmitry Osipenko --- drivers/gpu/drm/drm_gem_shmem_helper.c | 12 +++++++++++- include/drm/drm_gem_shmem_helper.h | 9 +++++++++ 2 files changed, 20 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index 49ab49454783..97b40676bdfa 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -280,12 +280,17 @@ EXPORT_SYMBOL(drm_gem_shmem_put_pages); int drm_gem_shmem_pin(struct drm_gem_shmem_object *shmem) { struct drm_gem_object *obj = &shmem->base; + int ret; dma_resv_assert_held(shmem->base.resv); drm_WARN_ON(obj->dev, obj->import_attach); - return drm_gem_shmem_get_pages(shmem); + ret = drm_gem_shmem_get_pages(shmem); + if (!ret) + shmem->pages_pin_count++; + + return ret; } EXPORT_SYMBOL(drm_gem_shmem_pin); @@ -304,7 +309,12 @@ void drm_gem_shmem_unpin(struct drm_gem_shmem_object *shmem) drm_WARN_ON(obj->dev, obj->import_attach); + if (drm_WARN_ON_ONCE(obj->dev, !shmem->pages_pin_count)) + return; + drm_gem_shmem_put_pages(shmem); + + shmem->pages_pin_count--; } EXPORT_SYMBOL(drm_gem_shmem_unpin); diff --git a/include/drm/drm_gem_shmem_helper.h b/include/drm/drm_gem_shmem_helper.h index 20ddcd799df9..7d823c9fc480 100644 --- a/include/drm/drm_gem_shmem_helper.h +++ b/include/drm/drm_gem_shmem_helper.h @@ -39,6 +39,15 @@ struct drm_gem_shmem_object { */ unsigned int pages_use_count; + /** + * @pages_pin_count: + * + * Reference count on the pinned pages table. + * The pages allowed to be evicted by memory shrinker + * only when the count is zero. + */ + unsigned int pages_pin_count; + /** * @madv: State for madvise *