Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753633AbcK0Qwt (ORCPT ); Sun, 27 Nov 2016 11:52:49 -0500 Received: from mout.gmx.net ([212.227.17.22]:59662 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752173AbcK0QwL (ORCPT ); Sun, 27 Nov 2016 11:52:11 -0500 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, 27 Nov 2016 17:51:48 +0100 Message-Id: <1480265509-20922-3-git-send-email-manuel.schoelling@gmx.de> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1480265509-20922-1-git-send-email-manuel.schoelling@gmx.de> References: <20161123173340.GA24872@angband.pl> <1480265509-20922-1-git-send-email-manuel.schoelling@gmx.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Provags-ID: V03:K0:krJTDnr2CaqxmYogblaLSd1CXREFAb2PFgWAV+qtCwP4lpt1dnZ V/XGs+KiZFQwRFhSK9MjUAW4JjaG2auOcJeSOjnyHn9VUspVoC9jNW9HTkR+Atj2GYDatgw i1sVsKEaQlFyCI0+8Ox+gdwgy6usWTzJpfOsrTvxeDY603bvnFPhFpcq4mXirrW2PbZE4iS lf/IhidKz8KIox4zkOiRw== X-UI-Out-Filterresults: notjunk:1;V01:K0:4oDZPPYT8iY=:7qGufkwbOSwlGNFVt+HhrJ 0RwimjxI517BOxWwdx9KnhWAYPJn5SfKSviuPS2BibuxHqzeNzb8iKNqUQ654/DX0yheHZat0 7TugCmUicXvxi+a2foofL65uNOxS5CziLH/bnVzMhyL76qS9RvgSqkNIocTDZ6WEr98svpbMw A/YUabvWgqIx4xY5Nx6SWh/BU5DNGe8tBprsvh1Q05pD+YFjA3MwIFXgjcfTFCRBdpuHX/LQi e4h+OI1ShJlO4XnyWoQbOjuAWdihQg/s9tvzIBGoVEGS1js5ig55lvrRRRcNl4KoR5sIKkx+s jBrkLEJ0Bq7nGGGlJgpPtcVUytJ+T0QYj1VDbh5RDLOKD0SrMtSr9R3srigtU+FBKxXoP/SMR Z4WavdnPApWOZW/DFx8l9sau5V0N+qqYKb3g279dsqsgBe/JtgSL+3OCd3fIIHtaJhQF4U4s6 q7jXmPZjqpzYWabr3/R3mnkCkUvfsa/LXOc6swpMQGnhG4AzJ6MsYzuVfmabV017M2JpgU/uX mNJflGTXquKQHSOzZH6nrTggBJ95Eg91etgoYmLsRpxb27rrEEK6i4k1bTxsniTPhHeCgGef3 UFi5Um7dQ00mBodlVEcuIjsbG+UF1J1sb/kCqbF4Pu3ZxqjtbaEZThEuAcjoMVRpm5USf8Ld6 y42eM46SsICpcbSwcfbUbBwZxv5P9FZ4FG/9vdRAinkiVdFuoxV3x5e0CR+mG7fYRBaY+KTER hwezj28tQFrQG22pVEwi46FhuLJNd6QJ4gcQ6s+Z4v3L47VPnDphWHSO258GR93Ig5d3ICR+/ GATy3t0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3824 Lines: 121 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 --- 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. -- 2.1.4