From mboxrd@z Thu Jan 1 00:00:00 1970 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 97913C4332F for ; Fri, 10 Nov 2023 18:37:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344941AbjKJSha (ORCPT ); Fri, 10 Nov 2023 13:37:30 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47688 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344843AbjKJSey (ORCPT ); Fri, 10 Nov 2023 13:34:54 -0500 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 F0DFC2AD3C for ; Fri, 10 Nov 2023 03:01:28 -0800 (PST) Received: from localhost (cola.collaboradmins.com [195.201.22.229]) (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: bbrezillon) by madras.collabora.co.uk (Postfix) with ESMTPSA id 8A25A66073EB; Fri, 10 Nov 2023 11:01:26 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1699614087; bh=M7g15Ds3YB0rAZrwMqFqhvf/l8gr3sjjjFteM0C28zs=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=Hbb8LDTQq4RSYvyQKXhwzEaFY3S/PSmM2XeVj8XNi5/pmEFm+CXppTiuTj7QD4CZx 8co2y4KUpNxbre2QFzUUcxRA8sCPdl2Z+jxgtbG+80PTAsE9BoMeC5F14w0W1jgmz/ OV5w1DJ/ocBfKg7xRQQelCeq/r68xhZxMOmsrL02W9qe9LuCWJhmbL6HHGAUD/0Ttf gHYguXb0/fxr81PZJhFrPt7GM8DXDF0KWVIHuuXNSLRCIbzrQHP/Aq36d0BSVXWFpV IZTIsIKBR0jzOw9XBpgwo9WUTuSuRdYKExb716IYVxzMjqPM6sGpodGY933J8AqFLT c9mLE9lfwOacw== Date: Fri, 10 Nov 2023 12:01:23 +0100 From: Boris Brezillon To: Dmitry Osipenko Cc: David Airlie , Gerd Hoffmann , Gurchetan Singh , Chia-I Wu , Daniel Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Christian =?UTF-8?B?S8O2bmln?= , Qiang Yu , Steven Price , Emma Anholt , Melissa Wen , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, kernel@collabora.com, virtualization@lists.linux-foundation.org Subject: Re: [PATCH v18 17/26] drm/v3d: Explicitly get and put drm-shmem pages Message-ID: <20231110120123.65f399af@collabora.com> In-Reply-To: <20231029230205.93277-18-dmitry.osipenko@collabora.com> References: <20231029230205.93277-1-dmitry.osipenko@collabora.com> <20231029230205.93277-18-dmitry.osipenko@collabora.com> Organization: Collabora X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 30 Oct 2023 02:01:56 +0300 Dmitry Osipenko wrote: > To simplify the drm-shmem refcnt handling, we're moving away from > the implicit get_pages() that is used by get_pages_sgt(). From now on > drivers will have to pin pages while they use sgt. V3D driver doesn't > support shrinker, hence pages are pinned and sgt is valid as long as > pages' use-count > 0. > > Signed-off-by: Dmitry Osipenko Reviewed-by: Boris Brezillon > --- > drivers/gpu/drm/v3d/v3d_bo.c | 11 ++++++++++- > 1 file changed, 10 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/v3d/v3d_bo.c b/drivers/gpu/drm/v3d/v3d_bo.c > index 42cd874f6810..0597c6b01b6c 100644 > --- a/drivers/gpu/drm/v3d/v3d_bo.c > +++ b/drivers/gpu/drm/v3d/v3d_bo.c > @@ -47,6 +47,9 @@ void v3d_free_object(struct drm_gem_object *obj) > /* GPU execution may have dirtied any pages in the BO. */ > bo->base.pages_mark_dirty_on_put = true; > > + if (!obj->import_attach) > + drm_gem_shmem_put_pages(&bo->base); > + > drm_gem_shmem_free(&bo->base); > } > > @@ -135,12 +138,18 @@ struct v3d_bo *v3d_bo_create(struct drm_device *dev, struct drm_file *file_priv, > return ERR_CAST(shmem_obj); > bo = to_v3d_bo(&shmem_obj->base); > > - ret = v3d_bo_create_finish(&shmem_obj->base); > + ret = drm_gem_shmem_get_pages(shmem_obj); > if (ret) > goto free_obj; > > + ret = v3d_bo_create_finish(&shmem_obj->base); > + if (ret) > + goto put_pages; > + > return bo; > > +put_pages: > + drm_gem_shmem_put_pages(shmem_obj); > free_obj: > drm_gem_shmem_free(shmem_obj); > return ERR_PTR(ret);