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Message-ID: <alpine.DEB.2.21.2105130024060.3032@angie.orcam.me.uk>
Date: Thu, 13 May 2021 02:37:35 +0200 (CEST)
From: "Maciej W. Rozycki" <macro@...am.me.uk>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jirislaby@...nel.org>
cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
Daniel Vetter <daniel@...ll.ch>,
Martin Hostettler <textshell@...uujin.de>,
Peilin Ye <yepeilin.cs@...il.com>,
dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] vt: Fix character height handling with VT_RESIZEX
Restore the original intent of the VT_RESIZEX ioctl's `v_clin' parameter
which is the number of pixel rows per character (cell) rather than the
height of the font used.
For framebuffer devices the two values are always the same, because the
former is inferred from the latter one. For VGA used as a true text
mode device these two parameters are independent from each other: the
number of pixel rows per character is set in the CRT controller, while
font height is in fact hardwired to 32 pixel rows and fonts of heights
below that value are handled by padding their data with blanks when
loaded to hardware for use by the character generator. One can change
the setting in the CRT controller and it will update the screen contents
accordingly regardless of the font loaded.
The `v_clin' parameter is used by the `vgacon' driver to set the height
of the character cell and then the cursor position within. Make the
parameter explicit then, by defining a new `vc_cell_height' struct
member of `vc_data', set it instead of `vc_font.height' from `v_clin' in
the VT_RESIZEX ioctl, and then use it throughout the `vgacon' driver
except where actual font data is accessed which as noted above is
independent from the CRTC setting.
This way the framebuffer console driver is free to ignore the `v_clin'
parameter as irrelevant, as it always should have, avoiding any issues
attempts to give the parameter a meaning there could have caused.
The problem first appeared around Linux 2.5.66 which predates our repo
history, but the origin could be identified with the old MIPS/Linux repo
also at: <git://git.kernel.org/pub/scm/linux/kernel/git/ralf/linux.git>
as commit 9736a3546de7 ("Merge with Linux 2.5.66."), where VT_RESIZEX
code in `vt_ioctl' was updated as follows:
if (clin)
- video_font_height = clin;
+ vc->vc_font.height = clin;
making the parameter apply to framebuffer devices as well, perhaps due
to the use of "font" in the name of the original `video_font_height'
variable. Use "cell" in the new struct member then to avoid ambiguity.
Signed-off-by: Maciej W. Rozycki <macro@...am.me.uk>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@...r.kernel.org # v2.6.12+
---
drivers/tty/vt/vt_ioctl.c | 6 ++---
drivers/video/console/vgacon.c | 44 ++++++++++++++++++++---------------------
include/linux/console_struct.h | 1
3 files changed, 26 insertions(+), 25 deletions(-)
Index: linux-macro-ide/drivers/tty/vt/vt_ioctl.c
===================================================================
--- linux-macro-ide.orig/drivers/tty/vt/vt_ioctl.c
+++ linux-macro-ide/drivers/tty/vt/vt_ioctl.c
@@ -706,17 +706,17 @@ static int vt_resizex(struct vc_data *vc
if (vcp) {
int ret;
int save_scan_lines = vcp->vc_scan_lines;
- int save_font_height = vcp->vc_font.height;
+ int save_cell_height = vcp->vc_cell_height;
if (v.v_vlin)
vcp->vc_scan_lines = v.v_vlin;
if (v.v_clin)
- vcp->vc_font.height = v.v_clin;
+ vcp->vc_cell_height = v.v_clin;
vcp->vc_resize_user = 1;
ret = vc_resize(vcp, v.v_cols, v.v_rows);
if (ret) {
vcp->vc_scan_lines = save_scan_lines;
- vcp->vc_font.height = save_font_height;
+ vcp->vc_cell_height = save_cell_height;
console_unlock();
return ret;
}
Index: linux-macro-ide/drivers/video/console/vgacon.c
===================================================================
--- linux-macro-ide.orig/drivers/video/console/vgacon.c
+++ linux-macro-ide/drivers/video/console/vgacon.c
@@ -383,7 +383,7 @@ static void vgacon_init(struct vc_data *
vc_resize(c, vga_video_num_columns, vga_video_num_lines);
c->vc_scan_lines = vga_scan_lines;
- c->vc_font.height = vga_video_font_height;
+ c->vc_font.height = c->vc_cell_height = vga_video_font_height;
c->vc_complement_mask = 0x7700;
if (vga_512_chars)
c->vc_hi_font_mask = 0x0800;
@@ -518,32 +518,32 @@ static void vgacon_cursor(struct vc_data
switch (CUR_SIZE(c->vc_cursor_type)) {
case CUR_UNDERLINE:
vgacon_set_cursor_size(c->state.x,
- c->vc_font.height -
- (c->vc_font.height <
+ c->vc_cell_height -
+ (c->vc_cell_height <
10 ? 2 : 3),
- c->vc_font.height -
- (c->vc_font.height <
+ c->vc_cell_height -
+ (c->vc_cell_height <
10 ? 1 : 2));
break;
case CUR_TWO_THIRDS:
vgacon_set_cursor_size(c->state.x,
- c->vc_font.height / 3,
- c->vc_font.height -
- (c->vc_font.height <
+ c->vc_cell_height / 3,
+ c->vc_cell_height -
+ (c->vc_cell_height <
10 ? 1 : 2));
break;
case CUR_LOWER_THIRD:
vgacon_set_cursor_size(c->state.x,
- (c->vc_font.height * 2) / 3,
- c->vc_font.height -
- (c->vc_font.height <
+ (c->vc_cell_height * 2) / 3,
+ c->vc_cell_height -
+ (c->vc_cell_height <
10 ? 1 : 2));
break;
case CUR_LOWER_HALF:
vgacon_set_cursor_size(c->state.x,
- c->vc_font.height / 2,
- c->vc_font.height -
- (c->vc_font.height <
+ c->vc_cell_height / 2,
+ c->vc_cell_height -
+ (c->vc_cell_height <
10 ? 1 : 2));
break;
case CUR_NONE:
@@ -554,7 +554,7 @@ static void vgacon_cursor(struct vc_data
break;
default:
vgacon_set_cursor_size(c->state.x, 1,
- c->vc_font.height);
+ c->vc_cell_height);
break;
}
break;
@@ -565,13 +565,13 @@ static int vgacon_doresize(struct vc_dat
unsigned int width, unsigned int height)
{
unsigned long flags;
- unsigned int scanlines = height * c->vc_font.height;
+ unsigned int scanlines = height * c->vc_cell_height;
u8 scanlines_lo = 0, r7 = 0, vsync_end = 0, mode, max_scan;
raw_spin_lock_irqsave(&vga_lock, flags);
vgacon_xres = width * VGA_FONTWIDTH;
- vgacon_yres = height * c->vc_font.height;
+ vgacon_yres = height * c->vc_cell_height;
if (vga_video_type >= VIDEO_TYPE_VGAC) {
outb_p(VGA_CRTC_MAX_SCAN, vga_video_port_reg);
max_scan = inb_p(vga_video_port_val);
@@ -626,9 +626,9 @@ static int vgacon_doresize(struct vc_dat
static int vgacon_switch(struct vc_data *c)
{
int x = c->vc_cols * VGA_FONTWIDTH;
- int y = c->vc_rows * c->vc_font.height;
+ int y = c->vc_rows * c->vc_cell_height;
int rows = screen_info.orig_video_lines * vga_default_font_height/
- c->vc_font.height;
+ c->vc_cell_height;
/*
* We need to save screen size here as it's the only way
* we can spot the screen has been resized and we need to
@@ -1041,7 +1041,7 @@ static int vgacon_adjust_height(struct v
cursor_size_lastto = 0;
c->vc_sw->con_cursor(c, CM_DRAW);
}
- c->vc_font.height = fontheight;
+ c->vc_font.height = c->vc_cell_height = fontheight;
vc_resize(c, 0, rows); /* Adjust console size */
}
}
@@ -1096,12 +1096,12 @@ static int vgacon_resize(struct vc_data
*/
screen_info.orig_video_cols = width;
screen_info.orig_video_lines = height;
- vga_default_font_height = c->vc_font.height;
+ vga_default_font_height = c->vc_cell_height;
return 0;
}
if (width % 2 || width > screen_info.orig_video_cols ||
height > (screen_info.orig_video_lines * vga_default_font_height)/
- c->vc_font.height)
+ c->vc_cell_height)
return -EINVAL;
if (con_is_visible(c) && !vga_is_gfx) /* who knows */
Index: linux-macro-ide/include/linux/console_struct.h
===================================================================
--- linux-macro-ide.orig/include/linux/console_struct.h
+++ linux-macro-ide/include/linux/console_struct.h
@@ -101,6 +101,7 @@ struct vc_data {
unsigned int vc_rows;
unsigned int vc_size_row; /* Bytes per row */
unsigned int vc_scan_lines; /* # of scan lines */
+ unsigned int vc_cell_height; /* CRTC character cell height */
unsigned long vc_origin; /* [!] Start of real screen */
unsigned long vc_scr_end; /* [!] End of real screen */
unsigned long vc_visible_origin; /* [!] Top of visible window */
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