From patchwork Tue Mar 12 15:45:02 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 13590221 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 6CDF5C54E60 for ; Tue, 12 Mar 2024 15:49:20 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A01A8112ED7; Tue, 12 Mar 2024 15:49:18 +0000 (UTC) Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.223.131]) by gabe.freedesktop.org (Postfix) with ESMTPS id 40AA7112EB8 for ; Tue, 12 Mar 2024 15:48:40 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (imap1.dmz-prg2.suse.org [IPv6:2a07:de40:b281:104:10:150:64:97]) (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) by smtp-out2.suse.de (Postfix) with ESMTPS id 179315D6C9; Tue, 12 Mar 2024 15:48:39 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (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) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id D22831364F; Tue, 12 Mar 2024 15:48:38 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 6FXqMVZ58GUhPwAAD6G6ig (envelope-from ); Tue, 12 Mar 2024 15:48:38 +0000 From: Thomas Zimmermann To: daniel@ffwll.ch, airlied@gmail.com, deller@gmx.de, javierm@redhat.com Cc: linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, Thomas Zimmermann Subject: [PATCH 07/43] fbdev/deferred-io: Provide get_page hook in struct fb_deferred_io Date: Tue, 12 Mar 2024 16:45:02 +0100 Message-ID: <20240312154834.26178-8-tzimmermann@suse.de> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240312154834.26178-1-tzimmermann@suse.de> References: <20240312154834.26178-1-tzimmermann@suse.de> MIME-Version: 1.0 Authentication-Results: smtp-out2.suse.de; none X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Spamd-Result: default: False [-4.00 / 50.00]; REPLY(-4.00)[] X-Rspamd-Queue-Id: 179315D6C9 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: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add a callback for drivers to provide framebuffer pages to fbdev's deferred-I/O helpers. Implementations need to acquire a reference on the page before returning it. Returning NULL generates a SIGBUS signal. This will be useful for DRM's fbdev emulation with GEM-shemem buffer objects. Signed-off-by: Thomas Zimmermann Reviewed-by: Javier Martinez Canillas --- drivers/video/fbdev/core/fb_defio.c | 4 ++++ include/linux/fb.h | 1 + 2 files changed, 5 insertions(+) diff --git a/drivers/video/fbdev/core/fb_defio.c b/drivers/video/fbdev/core/fb_defio.c index 6e0bbcfdb01b5..51928ff7961a5 100644 --- a/drivers/video/fbdev/core/fb_defio.c +++ b/drivers/video/fbdev/core/fb_defio.c @@ -25,9 +25,13 @@ static struct page *fb_deferred_io_get_page(struct fb_info *info, unsigned long offs) { + struct fb_deferred_io *fbdefio = info->fbdefio; const void *screen_buffer = info->screen_buffer; struct page *page = NULL; + if (fbdefio->get_page) + return fbdefio->get_page(info, offs); + if (is_vmalloc_addr(screen_buffer + offs)) page = vmalloc_to_page(screen_buffer + offs); else if (info->fix.smem_start) diff --git a/include/linux/fb.h b/include/linux/fb.h index 708e6a177b1be..bbb0805c0ab1e 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -219,6 +219,7 @@ struct fb_deferred_io { struct mutex lock; /* mutex that protects the pageref list */ struct list_head pagereflist; /* list of pagerefs for touched pages */ /* callback */ + struct page *(*get_page)(struct fb_info *info, unsigned long offset); void (*deferred_io)(struct fb_info *info, struct list_head *pagelist); }; #endif