From nobody Thu Dec 18 16:32:57 2025 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 29616C83F24 for ; Sun, 27 Aug 2023 17:57:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230063AbjH0R43 (ORCPT ); Sun, 27 Aug 2023 13:56:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37602 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229882AbjH0Rz4 (ORCPT ); Sun, 27 Aug 2023 13:55:56 -0400 Received: from madras.collabora.co.uk (madras.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e5ab]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DD240102 for ; Sun, 27 Aug 2023 10:55:54 -0700 (PDT) Received: from workpc.. (109-252-153-31.dynamic.spd-mgts.ru [109.252.153.31]) (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 2FD7F6607084; Sun, 27 Aug 2023 18:55:52 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1693158953; bh=noUNGit24aWm5+1m4sEixfN2bl0LkhYbrAV9hISCEws=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aDF95ldYyMt40X6CslVv4iO57vF5BcfnlMLrxtC1csAcnwI0swf40spqY80l6rTBk GNyDMUusYNqdG7YIFUYICt+xCkvpqRBA6m59EdXlIdBsnFSJK83YuRzxaRekCDORa+ niCZZFUTvgXyT/D0zhbgJo31XRk3+IHtcsYpJJJNtl1MddTXzGTFFLLEz8+btYdhlV 7ofS86NiyONtcCHCOQJKulBQzgC+4PY8ljY1YR3xAU3T2S66YWnw+XRnOyqI42DWl9 UNnzPzvCLFPi4LtB3/R4M5D3jxmX+EObN2ias6YMK0okJQGc39R45cNJ2euxVYVc0N h0zcDdDwUXauQ== From: Dmitry Osipenko To: David Airlie , Gerd Hoffmann , Gurchetan Singh , Chia-I Wu , Daniel Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , =?UTF-8?q?Christian=20K=C3=B6nig?= , Qiang Yu , Steven Price , Boris Brezillon , Emma Anholt , Melissa Wen , Will Deacon , Peter Zijlstra , Boqun Feng , Mark Rutland Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, kernel@collabora.com, virtualization@lists.linux-foundation.org, intel-gfx@lists.freedesktop.org Subject: [PATCH v15 02/23] drm/shmem-helper: Use flag for tracking page count bumped by get_pages_sgt() Date: Sun, 27 Aug 2023 20:54:28 +0300 Message-ID: <20230827175449.1766701-3-dmitry.osipenko@collabora.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230827175449.1766701-1-dmitry.osipenko@collabora.com> References: <20230827175449.1766701-1-dmitry.osipenko@collabora.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Use separate flag for tracking page count bumped by shmem->sgt to avoid imbalanced page counter during of drm_gem_shmem_free() time. It's fragile to assume that populated shmem->pages at a freeing time means that the count was bumped by drm_gem_shmem_get_pages_sgt(), using a flag removes the ambiguity. Signed-off-by: Dmitry Osipenko --- drivers/gpu/drm/drm_gem_shmem_helper.c | 3 ++- drivers/gpu/drm/lima/lima_gem.c | 1 + include/drm/drm_gem_shmem_helper.h | 7 +++++++ 3 files changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_g= em_shmem_helper.c index 78d9cf2355a5..db20b9123891 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -152,7 +152,7 @@ void drm_gem_shmem_free(struct drm_gem_shmem_object *sh= mem) sg_free_table(shmem->sgt); kfree(shmem->sgt); } - if (shmem->pages) + if (shmem->got_sgt) drm_gem_shmem_put_pages(shmem); =20 drm_WARN_ON(obj->dev, shmem->pages_use_count); @@ -687,6 +687,7 @@ static struct sg_table *drm_gem_shmem_get_pages_sgt_loc= ked(struct drm_gem_shmem_ if (ret) goto err_free_sgt; =20 + shmem->got_sgt =3D true; shmem->sgt =3D sgt; =20 return sgt; diff --git a/drivers/gpu/drm/lima/lima_gem.c b/drivers/gpu/drm/lima/lima_ge= m.c index 4f9736e5f929..28602302c281 100644 --- a/drivers/gpu/drm/lima/lima_gem.c +++ b/drivers/gpu/drm/lima/lima_gem.c @@ -89,6 +89,7 @@ int lima_heap_alloc(struct lima_bo *bo, struct lima_vm *v= m) } =20 *bo->base.sgt =3D sgt; + bo->base.got_sgt =3D true; =20 if (vm) { ret =3D lima_vm_map_bo(vm, bo, old_size >> PAGE_SHIFT); diff --git a/include/drm/drm_gem_shmem_helper.h b/include/drm/drm_gem_shmem= _helper.h index ec70a98a8fe1..f87124629bb5 100644 --- a/include/drm/drm_gem_shmem_helper.h +++ b/include/drm/drm_gem_shmem_helper.h @@ -73,6 +73,13 @@ struct drm_gem_shmem_object { */ unsigned int vmap_use_count; =20 + /** + * @got_sgt: + * + * True if SG table was retrieved using drm_gem_shmem_get_pages_sgt() + */ + bool got_sgt : 1; + /** * @imported_sgt: * --=20 2.41.0