From patchwork Sun Dec 4 10:53:55 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Manuel_Sch=C3=B6lling?= X-Patchwork-Id: 9459971 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 7104F6071C for ; Sun, 4 Dec 2016 10:54:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6DF4927F60 for ; Sun, 4 Dec 2016 10:54:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6181027F80; Sun, 4 Dec 2016 10:54:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,FREEMAIL_FROM, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C423327F60 for ; Sun, 4 Dec 2016 10:54:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751455AbcLDKye (ORCPT ); Sun, 4 Dec 2016 05:54:34 -0500 Received: from mout.gmx.net ([212.227.17.21]:53012 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750840AbcLDKyc (ORCPT ); Sun, 4 Dec 2016 05:54:32 -0500 Received: from schoellingm.dzne.de ([37.201.240.69]) by mail.gmx.com (mrgmx102 [212.227.17.168]) with ESMTPSA (Nemesis) id 0MWxtA-1cA4782suS-00W0DX; Sun, 04 Dec 2016 11:54:06 +0100 From: =?UTF-8?q?Manuel=20Sch=C3=B6lling?= To: plagnioj@jcrosoft.com, tomi.valkeinen@ti.com Cc: manuel.schoelling@gmx.de, jslaby@suse.cz, gregkh@linuxfoundation.org, andrey_utkin@fastmail.com, kilobyte@angband.pl, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v7 2/3] console: Add callback to flush scrollback buffer to consw struct Date: Sun, 4 Dec 2016 11:53:55 +0100 Message-Id: <1480848836-11330-3-git-send-email-manuel.schoelling@gmx.de> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1480848836-11330-1-git-send-email-manuel.schoelling@gmx.de> References: <1480848836-11330-1-git-send-email-manuel.schoelling@gmx.de> MIME-Version: 1.0 X-Provags-ID: V03:K0:NAb9xSRM0j8JzhmZwaxMu2CMnm9jhJ7Ac0JD3AthbG16V8rqX+D Qu4Rqj0lfPAEpIQn5KQMtuL6be3P6rr0TgIc4QQ3sgkXhX/26a3Yspx6kgyTnGAhiZQBBfX HbbkWSPlIoVMz/0KuJ/LndsyyHfiXnrfGkeOUYYGk/La8qhbimP0MwiNAijCHGY4m7lSo+5 b7f3psznrDbo1TQ2gLy2A== X-UI-Out-Filterresults: notjunk:1; V01:K0:ETq8SNb3CqU=:HPD5663WjvoFp1Jemwihq2 2P32jwbDjxDLq2waZcytrxHRji9Zx9L3NcsGdZKZ/qn8CH14T0J0ypvPXKPHkekOhlOdEyYlY XErYK1gjoQGtA11iX+IjhPmanMiZUz6wvbb2jhRjuHs3w2myxuVM42S0U+WQrPHo8QJ+tfyXA Z8y1i9ruVc+NHO02BqarBgtkFeCbvWq3gjeJbLOLLnNn4tr524HH+oVLRYTRC9syotDr/dwxg 7qMxEW9Xb1MnzGCtg7Kc3DT4/JSyWaFaLYTUn95x9jfYUp0AS6smRXMjUDCFHdyM6dixEdQDP VALyfOpJdHjSNAGw/AzxUyO9XNhXOJnaAJfELWNT+T1VD9IsTHxxyR5TJEyCIK5hx7haIwDj5 cFecx16/kFTida28FBzLBKOxxEEUfcYjsRC5j6x8zEk4AOhEcv0drz6Ai6cigeP+Cxxb/9bQi 7hTRcq+pWPSsbuHt3k/WJHvvAZMJkBxX4pd2BH7nmecpiwz1BhHemnQ5E88J47JnXLwJdQKZK IOSuNGlUdg7bZ653+DHbAWGAXnGevSy68yvzJ4jnpCyU+exCdujHGwitf+GKWxg1wqjwST+vc TST+1EL81MUBUkJtIBu5k5jnPJViskvEh0mnO9WBM1Y55xMIrxCzuNJ6nVmxf06rYzp/vDvWO emcZNuHS1YoG+frk8z3enAGK960Q0oicK+T2DU2DI4ZAAE6aM419yAfqnyM1sMq+4hnFWv7AS oMCKkAXpDOUIEZGTceAXf1ZWsQ08oLS8zSStVbCfFJPXlzrDzXtuwG67dcp36okxSaFPNg46E uFUF2mM Sender: linux-fbdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This new callback is in preparation for persistent scrollback buffer support for VGA consoles. With a single scrollback buffer for all consoles, we could flush the buffer just by invocating consw->con_switch(). But when each VGA console has its own scrollback buffer, we need a new callback to tell the video console driver which buffer to flush. Signed-off-by: Manuel Schölling Reviewed-by: Andrey Utkin Tested-by: Andrey Utkin Tested-by: Adam Borowski --- drivers/tty/vt/vt.c | 9 +++++++++ drivers/video/console/vgacon.c | 24 +++++++++++++++++++++++- include/linux/console.h | 4 ++++ 3 files changed, 36 insertions(+), 1 deletion(-) diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index 4c10a9d..9d3ce50 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -625,6 +625,14 @@ static void save_screen(struct vc_data *vc) vc->vc_sw->con_save_screen(vc); } +static void flush_scrollback(struct vc_data *vc) +{ + WARN_CONSOLE_UNLOCKED(); + + if (vc->vc_sw->con_flush_scrollback) + vc->vc_sw->con_flush_scrollback(vc); +} + /* * Redrawing of screen */ @@ -1171,6 +1179,7 @@ static void csi_J(struct vc_data *vc, int vpar) case 3: /* erase scroll-back buffer (and whole display) */ scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char, vc->vc_screenbuf_size); + flush_scrollback(vc); set_origin(vc); if (con_is_visible(vc)) update_screen(vc); diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c index 48b9764..9a7c2bb 100644 --- a/drivers/video/console/vgacon.c +++ b/drivers/video/console/vgacon.c @@ -173,6 +173,16 @@ static struct vgacon_scrollback_info { int restore; } vgacon_scrollback; +static void vgacon_scrollback_reset(size_t reset_size) +{ + if (vgacon_scrollback.data && reset_size > 0) + memset(vgacon_scrollback.data, 0, reset_size); + + vgacon_scrollback.cnt = 0; + vgacon_scrollback.tail = 0; + vgacon_scrollback.cur = 0; +} + static void vgacon_scrollback_init(int pitch) { int rows = CONFIG_VGACON_SOFT_SCROLLBACK_SIZE * 1024/pitch; @@ -305,6 +315,14 @@ static void vgacon_scrolldelta(struct vc_data *c, int lines) } else vgacon_cursor(c, CM_MOVE); } + +static void vgacon_flush_scrollback(struct vc_data *c) +{ + size_t size = CONFIG_VGACON_SOFT_SCROLLBACK_SIZE * 1024; + + if (c->vc_num == fg_console) + vgacon_scrollback_reset(size); +} #else #define vgacon_scrollback_startup(...) do { } while (0) #define vgacon_scrollback_init(...) do { } while (0) @@ -322,6 +340,10 @@ static void vgacon_scrolldelta(struct vc_data *c, int lines) vga_vram_size); vga_set_mem_top(c); } + +static void vgacon_flush_scrollback(struct vc_data *c) +{ +} #endif /* CONFIG_VGACON_SOFT_SCROLLBACK */ static const char *vgacon_startup(void) @@ -1329,7 +1351,6 @@ static bool vgacon_scroll(struct vc_data *c, unsigned int t, unsigned int b, return true; } - /* * The console `switch' structure for the VGA based console */ @@ -1362,6 +1383,7 @@ const struct consw vga_con = { .con_save_screen = vgacon_save_screen, .con_build_attr = vgacon_build_attr, .con_invert_region = vgacon_invert_region, + .con_flush_scrollback = vgacon_flush_scrollback, }; EXPORT_SYMBOL(vga_con); diff --git a/include/linux/console.h b/include/linux/console.h index 9c26c66..5949d18 100644 --- a/include/linux/console.h +++ b/include/linux/console.h @@ -73,6 +73,10 @@ struct consw { u16 *(*con_screen_pos)(struct vc_data *, int); unsigned long (*con_getxy)(struct vc_data *, unsigned long, int *, int *); /* + * Flush the video console driver's scrollback buffer + */ + void (*con_flush_scrollback)(struct vc_data *); + /* * Prepare the console for the debugger. This includes, but is not * limited to, unblanking the console, loading an appropriate * palette, and allowing debugger generated output.