linux/drivers/video/console/bitblit.c
Bruno Prémont 72caa5fb94 fbcon: Fix bit_putcs() call to kmalloc(s, GFP_KERNEL)
Switch to kmalloc(,GFP_ATOMIC) in bit_putcs to fix below trace:

[    9.771812] BUG: sleeping function called from invalid context at /usr/src/linux-git/mm/slub.c:943
[    9.771814] in_atomic(): 1, irqs_disabled(): 1, pid: 1063, name: mount
[    9.771818] Pid: 1063, comm: mount Not tainted 3.5.0-jupiter-00003-g8d858b1-dirty #2
[    9.771819] Call Trace:
[    9.771838]  [<c104f79b>] __might_sleep+0xcb/0xe0
[    9.771844]  [<c10c00d4>] __kmalloc+0xb4/0x1c0
[    9.771851]  [<c1041d4a>] ? queue_work+0x1a/0x30
[    9.771854]  [<c1041dcf>] ? queue_delayed_work+0xf/0x30
[    9.771862]  [<c1205832>] ? bit_putcs+0xf2/0x3e0
[    9.771865]  [<c1041e01>] ? schedule_delayed_work+0x11/0x20
[    9.771868]  [<c1205832>] bit_putcs+0xf2/0x3e0
[    9.771875]  [<c12002b8>] ? get_color.clone.14+0x28/0x100
[    9.771878]  [<c1200d2f>] fbcon_putcs+0x11f/0x130
[    9.771882]  [<c1205740>] ? bit_clear+0xe0/0xe0
[    9.771885]  [<c1200f6d>] fbcon_redraw.clone.21+0x11d/0x160
[    9.771889]  [<c120383d>] fbcon_scroll+0x79d/0xe10
[    9.771892]  [<c12002b8>] ? get_color.clone.14+0x28/0x100
[    9.771897]  [<c124c0b4>] scrup+0x64/0xd0
[    9.771900]  [<c124c22b>] lf+0x2b/0x60
[    9.771903]  [<c124cc95>] vt_console_print+0x1d5/0x2f0
[    9.771907]  [<c124cac0>] ? register_vt_notifier+0x20/0x20
[    9.771913]  [<c102b335>] call_console_drivers.clone.5+0xa5/0xc0
[    9.771916]  [<c102c58e>] console_unlock+0x2fe/0x3c0
[    9.771920]  [<c102ca16>] vprintk_emit+0x2e6/0x300
[    9.771924]  [<c13f01ae>] printk+0x38/0x3a
[    9.771931]  [<c112e8fe>] reiserfs_remount+0x2ae/0x3e0
[    9.771934]  [<c112e650>] ? reiserfs_fill_super+0xb00/0xb00
[    9.771939]  [<c10ca0ab>] do_remount_sb+0xab/0x150
[    9.771943]  [<c1034476>] ? ns_capable+0x46/0x70
[    9.771948]  [<c10e059c>] do_mount+0x20c/0x6b0
[    9.771955]  [<c10a7044>] ? strndup_user+0x34/0x50
[    9.771958]  [<c10e0acc>] sys_mount+0x6c/0xa0
[    9.771964]  [<c13f2557>] sysenter_do_call+0x12/0x26

According to comment in bit_putcs() that kammloc() call only happens
when fbcon is drawing to a monochrome framebuffer (which is my case with
hid-picolcd).

Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
2012-08-23 12:29:32 +00:00

424 lines
11 KiB
C

/*
* linux/drivers/video/console/bitblit.c -- BitBlitting Operation
*
* Originally from the 'accel_*' routines in drivers/video/console/fbcon.c
*
* Copyright (C) 2004 Antonino Daplas <adaplas @pol.net>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/fb.h>
#include <linux/vt_kern.h>
#include <linux/console.h>
#include <asm/types.h>
#include "fbcon.h"
/*
* Accelerated handlers.
*/
static void update_attr(u8 *dst, u8 *src, int attribute,
struct vc_data *vc)
{
int i, offset = (vc->vc_font.height < 10) ? 1 : 2;
int width = DIV_ROUND_UP(vc->vc_font.width, 8);
unsigned int cellsize = vc->vc_font.height * width;
u8 c;
offset = cellsize - (offset * width);
for (i = 0; i < cellsize; i++) {
c = src[i];
if (attribute & FBCON_ATTRIBUTE_UNDERLINE && i >= offset)
c = 0xff;
if (attribute & FBCON_ATTRIBUTE_BOLD)
c |= c >> 1;
if (attribute & FBCON_ATTRIBUTE_REVERSE)
c = ~c;
dst[i] = c;
}
}
static void bit_bmove(struct vc_data *vc, struct fb_info *info, int sy,
int sx, int dy, int dx, int height, int width)
{
struct fb_copyarea area;
area.sx = sx * vc->vc_font.width;
area.sy = sy * vc->vc_font.height;
area.dx = dx * vc->vc_font.width;
area.dy = dy * vc->vc_font.height;
area.height = height * vc->vc_font.height;
area.width = width * vc->vc_font.width;
info->fbops->fb_copyarea(info, &area);
}
static void bit_clear(struct vc_data *vc, struct fb_info *info, int sy,
int sx, int height, int width)
{
int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
struct fb_fillrect region;
region.color = attr_bgcol_ec(bgshift, vc, info);
region.dx = sx * vc->vc_font.width;
region.dy = sy * vc->vc_font.height;
region.width = width * vc->vc_font.width;
region.height = height * vc->vc_font.height;
region.rop = ROP_COPY;
info->fbops->fb_fillrect(info, &region);
}
static inline void bit_putcs_aligned(struct vc_data *vc, struct fb_info *info,
const u16 *s, u32 attr, u32 cnt,
u32 d_pitch, u32 s_pitch, u32 cellsize,
struct fb_image *image, u8 *buf, u8 *dst)
{
u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
u32 idx = vc->vc_font.width >> 3;
u8 *src;
while (cnt--) {
src = vc->vc_font.data + (scr_readw(s++)&
charmask)*cellsize;
if (attr) {
update_attr(buf, src, attr, vc);
src = buf;
}
if (likely(idx == 1))
__fb_pad_aligned_buffer(dst, d_pitch, src, idx,
image->height);
else
fb_pad_aligned_buffer(dst, d_pitch, src, idx,
image->height);
dst += s_pitch;
}
info->fbops->fb_imageblit(info, image);
}
static inline void bit_putcs_unaligned(struct vc_data *vc,
struct fb_info *info, const u16 *s,
u32 attr, u32 cnt, u32 d_pitch,
u32 s_pitch, u32 cellsize,
struct fb_image *image, u8 *buf,
u8 *dst)
{
u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
u32 shift_low = 0, mod = vc->vc_font.width % 8;
u32 shift_high = 8;
u32 idx = vc->vc_font.width >> 3;
u8 *src;
while (cnt--) {
src = vc->vc_font.data + (scr_readw(s++)&
charmask)*cellsize;
if (attr) {
update_attr(buf, src, attr, vc);
src = buf;
}
fb_pad_unaligned_buffer(dst, d_pitch, src, idx,
image->height, shift_high,
shift_low, mod);
shift_low += mod;
dst += (shift_low >= 8) ? s_pitch : s_pitch - 1;
shift_low &= 7;
shift_high = 8 - shift_low;
}
info->fbops->fb_imageblit(info, image);
}
static void bit_putcs(struct vc_data *vc, struct fb_info *info,
const unsigned short *s, int count, int yy, int xx,
int fg, int bg)
{
struct fb_image image;
u32 width = DIV_ROUND_UP(vc->vc_font.width, 8);
u32 cellsize = width * vc->vc_font.height;
u32 maxcnt = info->pixmap.size/cellsize;
u32 scan_align = info->pixmap.scan_align - 1;
u32 buf_align = info->pixmap.buf_align - 1;
u32 mod = vc->vc_font.width % 8, cnt, pitch, size;
u32 attribute = get_attribute(info, scr_readw(s));
u8 *dst, *buf = NULL;
image.fg_color = fg;
image.bg_color = bg;
image.dx = xx * vc->vc_font.width;
image.dy = yy * vc->vc_font.height;
image.height = vc->vc_font.height;
image.depth = 1;
if (attribute) {
buf = kmalloc(cellsize, GFP_ATOMIC);
if (!buf)
return;
}
while (count) {
if (count > maxcnt)
cnt = maxcnt;
else
cnt = count;
image.width = vc->vc_font.width * cnt;
pitch = DIV_ROUND_UP(image.width, 8) + scan_align;
pitch &= ~scan_align;
size = pitch * image.height + buf_align;
size &= ~buf_align;
dst = fb_get_buffer_offset(info, &info->pixmap, size);
image.data = dst;
if (!mod)
bit_putcs_aligned(vc, info, s, attribute, cnt, pitch,
width, cellsize, &image, buf, dst);
else
bit_putcs_unaligned(vc, info, s, attribute, cnt,
pitch, width, cellsize, &image,
buf, dst);
image.dx += cnt * vc->vc_font.width;
count -= cnt;
s += cnt;
}
/* buf is always NULL except when in monochrome mode, so in this case
it's a gain to check buf against NULL even though kfree() handles
NULL pointers just fine */
if (unlikely(buf))
kfree(buf);
}
static void bit_clear_margins(struct vc_data *vc, struct fb_info *info,
int bottom_only)
{
int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
unsigned int cw = vc->vc_font.width;
unsigned int ch = vc->vc_font.height;
unsigned int rw = info->var.xres - (vc->vc_cols*cw);
unsigned int bh = info->var.yres - (vc->vc_rows*ch);
unsigned int rs = info->var.xres - rw;
unsigned int bs = info->var.yres - bh;
struct fb_fillrect region;
region.color = attr_bgcol_ec(bgshift, vc, info);
region.rop = ROP_COPY;
if (rw && !bottom_only) {
region.dx = info->var.xoffset + rs;
region.dy = 0;
region.width = rw;
region.height = info->var.yres_virtual;
info->fbops->fb_fillrect(info, &region);
}
if (bh) {
region.dx = info->var.xoffset;
region.dy = info->var.yoffset + bs;
region.width = rs;
region.height = bh;
info->fbops->fb_fillrect(info, &region);
}
}
static void bit_cursor(struct vc_data *vc, struct fb_info *info, int mode,
int softback_lines, int fg, int bg)
{
struct fb_cursor cursor;
struct fbcon_ops *ops = info->fbcon_par;
unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
int w = DIV_ROUND_UP(vc->vc_font.width, 8), c;
int y = real_y(ops->p, vc->vc_y);
int attribute, use_sw = (vc->vc_cursor_type & 0x10);
int err = 1;
char *src;
cursor.set = 0;
if (softback_lines) {
if (y + softback_lines >= vc->vc_rows) {
mode = CM_ERASE;
ops->cursor_flash = 0;
return;
} else
y += softback_lines;
}
c = scr_readw((u16 *) vc->vc_pos);
attribute = get_attribute(info, c);
src = vc->vc_font.data + ((c & charmask) * (w * vc->vc_font.height));
if (ops->cursor_state.image.data != src ||
ops->cursor_reset) {
ops->cursor_state.image.data = src;
cursor.set |= FB_CUR_SETIMAGE;
}
if (attribute) {
u8 *dst;
dst = kmalloc(w * vc->vc_font.height, GFP_ATOMIC);
if (!dst)
return;
kfree(ops->cursor_data);
ops->cursor_data = dst;
update_attr(dst, src, attribute, vc);
src = dst;
}
if (ops->cursor_state.image.fg_color != fg ||
ops->cursor_state.image.bg_color != bg ||
ops->cursor_reset) {
ops->cursor_state.image.fg_color = fg;
ops->cursor_state.image.bg_color = bg;
cursor.set |= FB_CUR_SETCMAP;
}
if ((ops->cursor_state.image.dx != (vc->vc_font.width * vc->vc_x)) ||
(ops->cursor_state.image.dy != (vc->vc_font.height * y)) ||
ops->cursor_reset) {
ops->cursor_state.image.dx = vc->vc_font.width * vc->vc_x;
ops->cursor_state.image.dy = vc->vc_font.height * y;
cursor.set |= FB_CUR_SETPOS;
}
if (ops->cursor_state.image.height != vc->vc_font.height ||
ops->cursor_state.image.width != vc->vc_font.width ||
ops->cursor_reset) {
ops->cursor_state.image.height = vc->vc_font.height;
ops->cursor_state.image.width = vc->vc_font.width;
cursor.set |= FB_CUR_SETSIZE;
}
if (ops->cursor_state.hot.x || ops->cursor_state.hot.y ||
ops->cursor_reset) {
ops->cursor_state.hot.x = cursor.hot.y = 0;
cursor.set |= FB_CUR_SETHOT;
}
if (cursor.set & FB_CUR_SETSIZE ||
vc->vc_cursor_type != ops->p->cursor_shape ||
ops->cursor_state.mask == NULL ||
ops->cursor_reset) {
char *mask = kmalloc(w*vc->vc_font.height, GFP_ATOMIC);
int cur_height, size, i = 0;
u8 msk = 0xff;
if (!mask)
return;
kfree(ops->cursor_state.mask);
ops->cursor_state.mask = mask;
ops->p->cursor_shape = vc->vc_cursor_type;
cursor.set |= FB_CUR_SETSHAPE;
switch (ops->p->cursor_shape & CUR_HWMASK) {
case CUR_NONE:
cur_height = 0;
break;
case CUR_UNDERLINE:
cur_height = (vc->vc_font.height < 10) ? 1 : 2;
break;
case CUR_LOWER_THIRD:
cur_height = vc->vc_font.height/3;
break;
case CUR_LOWER_HALF:
cur_height = vc->vc_font.height >> 1;
break;
case CUR_TWO_THIRDS:
cur_height = (vc->vc_font.height << 1)/3;
break;
case CUR_BLOCK:
default:
cur_height = vc->vc_font.height;
break;
}
size = (vc->vc_font.height - cur_height) * w;
while (size--)
mask[i++] = ~msk;
size = cur_height * w;
while (size--)
mask[i++] = msk;
}
switch (mode) {
case CM_ERASE:
ops->cursor_state.enable = 0;
break;
case CM_DRAW:
case CM_MOVE:
default:
ops->cursor_state.enable = (use_sw) ? 0 : 1;
break;
}
cursor.image.data = src;
cursor.image.fg_color = ops->cursor_state.image.fg_color;
cursor.image.bg_color = ops->cursor_state.image.bg_color;
cursor.image.dx = ops->cursor_state.image.dx;
cursor.image.dy = ops->cursor_state.image.dy;
cursor.image.height = ops->cursor_state.image.height;
cursor.image.width = ops->cursor_state.image.width;
cursor.hot.x = ops->cursor_state.hot.x;
cursor.hot.y = ops->cursor_state.hot.y;
cursor.mask = ops->cursor_state.mask;
cursor.enable = ops->cursor_state.enable;
cursor.image.depth = 1;
cursor.rop = ROP_XOR;
if (info->fbops->fb_cursor)
err = info->fbops->fb_cursor(info, &cursor);
if (err)
soft_cursor(info, &cursor);
ops->cursor_reset = 0;
}
static int bit_update_start(struct fb_info *info)
{
struct fbcon_ops *ops = info->fbcon_par;
int err;
err = fb_pan_display(info, &ops->var);
ops->var.xoffset = info->var.xoffset;
ops->var.yoffset = info->var.yoffset;
ops->var.vmode = info->var.vmode;
return err;
}
void fbcon_set_bitops(struct fbcon_ops *ops)
{
ops->bmove = bit_bmove;
ops->clear = bit_clear;
ops->putcs = bit_putcs;
ops->clear_margins = bit_clear_margins;
ops->cursor = bit_cursor;
ops->update_start = bit_update_start;
ops->rotate_font = NULL;
if (ops->rotate)
fbcon_set_rotate(ops);
}
EXPORT_SYMBOL(fbcon_set_bitops);
MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
MODULE_DESCRIPTION("Bit Blitting Operation");
MODULE_LICENSE("GPL");