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fbcon: remove soft scrollback code
This (and the VGA soft scrollback) turns out to have various nasty small special cases that nobody really is willing to fight. The soft scrollback code was really useful a few decades ago when you typically used the console interactively as the main way to interact with the machine, but that just isn't the case any more. So it's not worth dragging along. Tested-by: Yuan Ming <yuanmingbuaa@gmail.com> Tested-by: Willy Tarreau <w@1wt.eu> Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds
parent
856deb866d
commit
50145474f6
@ -122,12 +122,6 @@ static int logo_lines;
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/* logo_shown is an index to vc_cons when >= 0; otherwise follows FBCON_LOGO
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enums. */
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static int logo_shown = FBCON_LOGO_CANSHOW;
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/* Software scrollback */
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static int fbcon_softback_size = 32768;
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static unsigned long softback_buf, softback_curr;
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static unsigned long softback_in;
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static unsigned long softback_top, softback_end;
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static int softback_lines;
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/* console mappings */
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static int first_fb_vc;
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static int last_fb_vc = MAX_NR_CONSOLES - 1;
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@ -167,8 +161,6 @@ static int margin_color;
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static const struct consw fb_con;
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#define CM_SOFTBACK (8)
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#define advance_row(p, delta) (unsigned short *)((unsigned long)(p) + (delta) * vc->vc_size_row)
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static int fbcon_set_origin(struct vc_data *);
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@ -373,18 +365,6 @@ static int get_color(struct vc_data *vc, struct fb_info *info,
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return color;
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}
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static void fbcon_update_softback(struct vc_data *vc)
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{
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int l = fbcon_softback_size / vc->vc_size_row;
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if (l > 5)
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softback_end = softback_buf + l * vc->vc_size_row;
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else
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/* Smaller scrollback makes no sense, and 0 would screw
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the operation totally */
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softback_top = 0;
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}
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static void fb_flashcursor(struct work_struct *work)
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{
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struct fb_info *info = container_of(work, struct fb_info, queue);
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@ -414,7 +394,7 @@ static void fb_flashcursor(struct work_struct *work)
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c = scr_readw((u16 *) vc->vc_pos);
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mode = (!ops->cursor_flash || ops->cursor_state.enable) ?
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CM_ERASE : CM_DRAW;
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ops->cursor(vc, info, mode, softback_lines, get_color(vc, info, c, 1),
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ops->cursor(vc, info, mode, 0, get_color(vc, info, c, 1),
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get_color(vc, info, c, 0));
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console_unlock();
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}
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@ -471,13 +451,7 @@ static int __init fb_console_setup(char *this_opt)
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}
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if (!strncmp(options, "scrollback:", 11)) {
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options += 11;
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if (*options) {
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fbcon_softback_size = simple_strtoul(options, &options, 0);
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if (*options == 'k' || *options == 'K') {
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fbcon_softback_size *= 1024;
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}
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}
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pr_warn("Ignoring scrollback size option\n");
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continue;
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}
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@ -1022,31 +996,6 @@ static const char *fbcon_startup(void)
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set_blitting_type(vc, info);
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if (info->fix.type != FB_TYPE_TEXT) {
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if (fbcon_softback_size) {
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if (!softback_buf) {
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softback_buf =
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(unsigned long)
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kvmalloc(fbcon_softback_size,
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GFP_KERNEL);
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if (!softback_buf) {
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fbcon_softback_size = 0;
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softback_top = 0;
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}
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}
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} else {
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if (softback_buf) {
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kvfree((void *) softback_buf);
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softback_buf = 0;
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softback_top = 0;
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}
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}
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if (softback_buf)
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softback_in = softback_top = softback_curr =
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softback_buf;
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softback_lines = 0;
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}
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/* Setup default font */
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if (!p->fontdata && !vc->vc_font.data) {
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if (!fontname[0] || !(font = find_font(fontname)))
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@ -1220,9 +1169,6 @@ static void fbcon_init(struct vc_data *vc, int init)
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if (logo)
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fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);
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if (vc == svc && softback_buf)
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fbcon_update_softback(vc);
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if (ops->rotate_font && ops->rotate_font(info, vc)) {
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ops->rotate = FB_ROTATE_UR;
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set_blitting_type(vc, info);
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@ -1385,7 +1331,6 @@ static void fbcon_cursor(struct vc_data *vc, int mode)
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{
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struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
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struct fbcon_ops *ops = info->fbcon_par;
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int y;
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int c = scr_readw((u16 *) vc->vc_pos);
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ops->cur_blink_jiffies = msecs_to_jiffies(vc->vc_cur_blink_ms);
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@ -1399,16 +1344,8 @@ static void fbcon_cursor(struct vc_data *vc, int mode)
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fbcon_add_cursor_timer(info);
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ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
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if (mode & CM_SOFTBACK) {
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mode &= ~CM_SOFTBACK;
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y = softback_lines;
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} else {
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if (softback_lines)
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fbcon_set_origin(vc);
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y = 0;
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}
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ops->cursor(vc, info, mode, y, get_color(vc, info, c, 1),
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ops->cursor(vc, info, mode, 0, get_color(vc, info, c, 1),
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get_color(vc, info, c, 0));
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}
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@ -1479,8 +1416,6 @@ static void fbcon_set_disp(struct fb_info *info, struct fb_var_screeninfo *var,
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if (con_is_visible(vc)) {
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update_screen(vc);
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if (softback_buf)
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fbcon_update_softback(vc);
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}
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}
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@ -1618,99 +1553,6 @@ static __inline__ void ypan_down_redraw(struct vc_data *vc, int t, int count)
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scrollback_current = 0;
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}
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static void fbcon_redraw_softback(struct vc_data *vc, struct fbcon_display *p,
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long delta)
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{
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int count = vc->vc_rows;
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unsigned short *d, *s;
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unsigned long n;
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int line = 0;
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d = (u16 *) softback_curr;
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if (d == (u16 *) softback_in)
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d = (u16 *) vc->vc_origin;
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n = softback_curr + delta * vc->vc_size_row;
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softback_lines -= delta;
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if (delta < 0) {
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if (softback_curr < softback_top && n < softback_buf) {
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n += softback_end - softback_buf;
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if (n < softback_top) {
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softback_lines -=
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(softback_top - n) / vc->vc_size_row;
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n = softback_top;
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}
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} else if (softback_curr >= softback_top
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&& n < softback_top) {
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softback_lines -=
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(softback_top - n) / vc->vc_size_row;
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n = softback_top;
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}
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} else {
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if (softback_curr > softback_in && n >= softback_end) {
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n += softback_buf - softback_end;
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if (n > softback_in) {
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n = softback_in;
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softback_lines = 0;
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}
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} else if (softback_curr <= softback_in && n > softback_in) {
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n = softback_in;
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softback_lines = 0;
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}
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}
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if (n == softback_curr)
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return;
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softback_curr = n;
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s = (u16 *) softback_curr;
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if (s == (u16 *) softback_in)
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s = (u16 *) vc->vc_origin;
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while (count--) {
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unsigned short *start;
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unsigned short *le;
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unsigned short c;
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int x = 0;
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unsigned short attr = 1;
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start = s;
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le = advance_row(s, 1);
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do {
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c = scr_readw(s);
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if (attr != (c & 0xff00)) {
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attr = c & 0xff00;
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if (s > start) {
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fbcon_putcs(vc, start, s - start,
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line, x);
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x += s - start;
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start = s;
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}
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}
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if (c == scr_readw(d)) {
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if (s > start) {
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fbcon_putcs(vc, start, s - start,
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line, x);
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x += s - start + 1;
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start = s + 1;
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} else {
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x++;
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start++;
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}
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}
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s++;
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d++;
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} while (s < le);
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if (s > start)
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fbcon_putcs(vc, start, s - start, line, x);
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line++;
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if (d == (u16 *) softback_end)
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d = (u16 *) softback_buf;
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if (d == (u16 *) softback_in)
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d = (u16 *) vc->vc_origin;
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if (s == (u16 *) softback_end)
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s = (u16 *) softback_buf;
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if (s == (u16 *) softback_in)
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s = (u16 *) vc->vc_origin;
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}
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}
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static void fbcon_redraw_move(struct vc_data *vc, struct fbcon_display *p,
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int line, int count, int dy)
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{
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@ -1850,31 +1692,6 @@ static void fbcon_redraw(struct vc_data *vc, struct fbcon_display *p,
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}
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}
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static inline void fbcon_softback_note(struct vc_data *vc, int t,
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int count)
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{
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unsigned short *p;
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if (vc->vc_num != fg_console)
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return;
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p = (unsigned short *) (vc->vc_origin + t * vc->vc_size_row);
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while (count) {
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scr_memcpyw((u16 *) softback_in, p, vc->vc_size_row);
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count--;
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p = advance_row(p, 1);
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softback_in += vc->vc_size_row;
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if (softback_in == softback_end)
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softback_in = softback_buf;
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if (softback_in == softback_top) {
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softback_top += vc->vc_size_row;
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if (softback_top == softback_end)
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softback_top = softback_buf;
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}
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}
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softback_curr = softback_in;
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}
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static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
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enum con_scroll dir, unsigned int count)
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{
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@ -1897,8 +1714,6 @@ static bool fbcon_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
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case SM_UP:
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if (count > vc->vc_rows) /* Maximum realistic size */
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count = vc->vc_rows;
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if (softback_top)
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fbcon_softback_note(vc, t, count);
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if (logo_shown >= 0)
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goto redraw_up;
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switch (p->scrollmode) {
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@ -2269,14 +2084,6 @@ static int fbcon_switch(struct vc_data *vc)
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info = registered_fb[con2fb_map[vc->vc_num]];
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ops = info->fbcon_par;
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if (softback_top) {
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if (softback_lines)
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fbcon_set_origin(vc);
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softback_top = softback_curr = softback_in = softback_buf;
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softback_lines = 0;
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fbcon_update_softback(vc);
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}
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if (logo_shown >= 0) {
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struct vc_data *conp2 = vc_cons[logo_shown].d;
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@ -2600,9 +2407,6 @@ static int fbcon_do_set_font(struct vc_data *vc, int w, int h,
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int cnt;
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char *old_data = NULL;
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if (con_is_visible(vc) && softback_lines)
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fbcon_set_origin(vc);
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resize = (w != vc->vc_font.width) || (h != vc->vc_font.height);
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if (p->userfont)
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old_data = vc->vc_font.data;
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@ -2628,8 +2432,6 @@ static int fbcon_do_set_font(struct vc_data *vc, int w, int h,
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cols /= w;
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rows /= h;
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vc_resize(vc, cols, rows);
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if (con_is_visible(vc) && softback_buf)
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fbcon_update_softback(vc);
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} else if (con_is_visible(vc)
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&& vc->vc_mode == KD_TEXT) {
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fbcon_clear_margins(vc, 0);
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@ -2788,19 +2590,7 @@ static void fbcon_set_palette(struct vc_data *vc, const unsigned char *table)
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static u16 *fbcon_screen_pos(struct vc_data *vc, int offset)
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{
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unsigned long p;
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int line;
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if (vc->vc_num != fg_console || !softback_lines)
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return (u16 *) (vc->vc_origin + offset);
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line = offset / vc->vc_size_row;
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if (line >= softback_lines)
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return (u16 *) (vc->vc_origin + offset -
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softback_lines * vc->vc_size_row);
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p = softback_curr + offset;
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if (p >= softback_end)
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p += softback_buf - softback_end;
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return (u16 *) p;
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return (u16 *) (vc->vc_origin + offset);
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}
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static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
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@ -2814,22 +2604,7 @@ static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
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x = offset % vc->vc_cols;
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y = offset / vc->vc_cols;
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if (vc->vc_num == fg_console)
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y += softback_lines;
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ret = pos + (vc->vc_cols - x) * 2;
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} else if (vc->vc_num == fg_console && softback_lines) {
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unsigned long offset = pos - softback_curr;
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if (pos < softback_curr)
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offset += softback_end - softback_buf;
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offset /= 2;
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x = offset % vc->vc_cols;
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y = offset / vc->vc_cols;
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ret = pos + (vc->vc_cols - x) * 2;
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if (ret == softback_end)
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ret = softback_buf;
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if (ret == softback_in)
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ret = vc->vc_origin;
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} else {
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/* Should not happen */
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x = y = 0;
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@ -2857,106 +2632,11 @@ static void fbcon_invert_region(struct vc_data *vc, u16 * p, int cnt)
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a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
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(((a) & 0x0700) << 4);
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scr_writew(a, p++);
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if (p == (u16 *) softback_end)
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p = (u16 *) softback_buf;
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if (p == (u16 *) softback_in)
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p = (u16 *) vc->vc_origin;
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}
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}
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static void fbcon_scrolldelta(struct vc_data *vc, int lines)
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{
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struct fb_info *info = registered_fb[con2fb_map[fg_console]];
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struct fbcon_ops *ops = info->fbcon_par;
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struct fbcon_display *disp = &fb_display[fg_console];
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int offset, limit, scrollback_old;
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if (softback_top) {
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if (vc->vc_num != fg_console)
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return;
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if (vc->vc_mode != KD_TEXT || !lines)
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return;
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if (logo_shown >= 0) {
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struct vc_data *conp2 = vc_cons[logo_shown].d;
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if (conp2->vc_top == logo_lines
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&& conp2->vc_bottom == conp2->vc_rows)
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conp2->vc_top = 0;
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if (logo_shown == vc->vc_num) {
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unsigned long p, q;
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int i;
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p = softback_in;
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q = vc->vc_origin +
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logo_lines * vc->vc_size_row;
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for (i = 0; i < logo_lines; i++) {
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if (p == softback_top)
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break;
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if (p == softback_buf)
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p = softback_end;
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p -= vc->vc_size_row;
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q -= vc->vc_size_row;
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scr_memcpyw((u16 *) q, (u16 *) p,
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vc->vc_size_row);
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}
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softback_in = softback_curr = p;
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update_region(vc, vc->vc_origin,
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logo_lines * vc->vc_cols);
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}
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logo_shown = FBCON_LOGO_CANSHOW;
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}
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fbcon_cursor(vc, CM_ERASE | CM_SOFTBACK);
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fbcon_redraw_softback(vc, disp, lines);
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fbcon_cursor(vc, CM_DRAW | CM_SOFTBACK);
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return;
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}
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if (!scrollback_phys_max)
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return;
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scrollback_old = scrollback_current;
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scrollback_current -= lines;
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if (scrollback_current < 0)
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scrollback_current = 0;
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else if (scrollback_current > scrollback_max)
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scrollback_current = scrollback_max;
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if (scrollback_current == scrollback_old)
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return;
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if (fbcon_is_inactive(vc, info))
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return;
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||||
|
||||
fbcon_cursor(vc, CM_ERASE);
|
||||
|
||||
offset = disp->yscroll - scrollback_current;
|
||||
limit = disp->vrows;
|
||||
switch (disp->scrollmode) {
|
||||
case SCROLL_WRAP_MOVE:
|
||||
info->var.vmode |= FB_VMODE_YWRAP;
|
||||
break;
|
||||
case SCROLL_PAN_MOVE:
|
||||
case SCROLL_PAN_REDRAW:
|
||||
limit -= vc->vc_rows;
|
||||
info->var.vmode &= ~FB_VMODE_YWRAP;
|
||||
break;
|
||||
}
|
||||
if (offset < 0)
|
||||
offset += limit;
|
||||
else if (offset >= limit)
|
||||
offset -= limit;
|
||||
|
||||
ops->var.xoffset = 0;
|
||||
ops->var.yoffset = offset * vc->vc_font.height;
|
||||
ops->update_start(info);
|
||||
|
||||
if (!scrollback_current)
|
||||
fbcon_cursor(vc, CM_DRAW);
|
||||
}
|
||||
|
||||
static int fbcon_set_origin(struct vc_data *vc)
|
||||
{
|
||||
if (softback_lines)
|
||||
fbcon_scrolldelta(vc, softback_lines);
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -3020,8 +2700,6 @@ static void fbcon_modechanged(struct fb_info *info)
|
||||
|
||||
fbcon_set_palette(vc, color_table);
|
||||
update_screen(vc);
|
||||
if (softback_buf)
|
||||
fbcon_update_softback(vc);
|
||||
}
|
||||
}
|
||||
|
||||
@ -3432,7 +3110,6 @@ static const struct consw fb_con = {
|
||||
.con_font_default = fbcon_set_def_font,
|
||||
.con_font_copy = fbcon_copy_font,
|
||||
.con_set_palette = fbcon_set_palette,
|
||||
.con_scrolldelta = fbcon_scrolldelta,
|
||||
.con_set_origin = fbcon_set_origin,
|
||||
.con_invert_region = fbcon_invert_region,
|
||||
.con_screen_pos = fbcon_screen_pos,
|
||||
@ -3667,9 +3344,6 @@ static void fbcon_exit(void)
|
||||
}
|
||||
#endif
|
||||
|
||||
kvfree((void *)softback_buf);
|
||||
softback_buf = 0UL;
|
||||
|
||||
for_each_registered_fb(i) {
|
||||
int pending = 0;
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user