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drm/panic: Add panic description

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Now that kmsg dump callback has the description parameter, use it in
the user panic screen.
This is the string passed to panic(), like "VFS: Unable to mount root
fs on xxx" or "Attempted to kill init! exitcode=0xxxx".
It gives a hint on why the panic occurred, without being too cryptic.

Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20240807134902.458669-6-jfalempe@redhat.com
This commit is contained in:
Jocelyn Falempe 2024-08-07 15:36:14 +02:00
parent 969135862e
commit 5d45c01dea
1 changed files with 45 additions and 13 deletions
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58
drivers/gpu/drm/drm_panic.c
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@ -81,8 +81,12 @@ static struct drm_panic_line panic_msg[] = {
PANIC_LINE("KERNEL PANIC!"),
PANIC_LINE(""),
PANIC_LINE("Please reboot your computer."),
PANIC_LINE(""),
PANIC_LINE(""), /* will be replaced by the panic description */
};
#define PANIC_MSG_LINES ARRAY_SIZE(panic_msg)
static const struct drm_panic_line logo_ascii[] = {
PANIC_LINE(" .--. _"),
PANIC_LINE(" |o_o | | |"),
@ -93,6 +97,8 @@ static const struct drm_panic_line logo_ascii[] = {
PANIC_LINE(" \\___)=(___/"),
};
#define PANIC_LOGO_LINES ARRAY_SIZE(logo_ascii)
#if defined(CONFIG_LOGO) && !defined(MODULE)
static const struct linux_logo *logo_mono;
@ -487,13 +493,12 @@ static void draw_txt_rectangle(struct drm_scanout_buffer *sb,
static void draw_panic_static_user(struct drm_scanout_buffer *sb)
{
size_t msg_lines = ARRAY_SIZE(panic_msg);
size_t logo_ascii_lines = ARRAY_SIZE(logo_ascii);
u32 fg_color = convert_from_xrgb8888(CONFIG_DRM_PANIC_FOREGROUND_COLOR, sb->format->format);
u32 bg_color = convert_from_xrgb8888(CONFIG_DRM_PANIC_BACKGROUND_COLOR, sb->format->format);
const struct font_desc *font = get_default_font(sb->width, sb->height, NULL, NULL);
struct drm_rect r_screen, r_logo, r_msg;
unsigned int logo_width, logo_height;
unsigned int msg_width, msg_height;
if (!font)
return;
@ -504,14 +509,14 @@ static void draw_panic_static_user(struct drm_scanout_buffer *sb)
logo_width = logo_mono->width;
logo_height = logo_mono->height;
} else {
logo_width = get_max_line_len(logo_ascii, logo_ascii_lines) * font->width;
logo_height = logo_ascii_lines * font->height;
logo_width = get_max_line_len(logo_ascii, PANIC_LOGO_LINES) * font->width;
logo_height = PANIC_LOGO_LINES * font->height;
}
r_logo = DRM_RECT_INIT(0, 0, logo_width, logo_height);
r_msg = DRM_RECT_INIT(0, 0,
min(get_max_line_len(panic_msg, msg_lines) * font->width, sb->width),
min(msg_lines * font->height, sb->height));
msg_width = min(get_max_line_len(panic_msg, PANIC_MSG_LINES) * font->width, sb->width);
msg_height = min(PANIC_MSG_LINES * font->height, sb->height);
r_msg = DRM_RECT_INIT(0, 0, msg_width, msg_height);
/* Center the panic message */
drm_rect_translate(&r_msg, (sb->width - r_msg.x2) / 2, (sb->height - r_msg.y2) / 2);
@ -525,10 +530,10 @@ static void draw_panic_static_user(struct drm_scanout_buffer *sb)
drm_panic_blit(sb, &r_logo, logo_mono->data, DIV_ROUND_UP(logo_width, 8),
fg_color);
else
draw_txt_rectangle(sb, font, logo_ascii, logo_ascii_lines, false, &r_logo,
draw_txt_rectangle(sb, font, logo_ascii, PANIC_LOGO_LINES, false, &r_logo,
fg_color);
}
draw_txt_rectangle(sb, font, panic_msg, msg_lines, true, &r_msg, fg_color);
draw_txt_rectangle(sb, font, panic_msg, PANIC_MSG_LINES, true, &r_msg, fg_color);
}
/*
@ -633,7 +638,31 @@ static void draw_panic_dispatch(struct drm_scanout_buffer *sb)
}
}
static void draw_panic_plane(struct drm_plane *plane)
static void drm_panic_set_description(const char *description)
{
u32 len;
if (description) {
struct drm_panic_line *desc_line = &panic_msg[PANIC_MSG_LINES - 1];
desc_line->txt = description;
len = strlen(description);
/* ignore the last newline character */
if (len && description[len - 1] == '\n')
len -= 1;
desc_line->len = len;
}
}
static void drm_panic_clear_description(void)
{
struct drm_panic_line *desc_line = &panic_msg[PANIC_MSG_LINES - 1];
desc_line->len = 0;
desc_line->txt = NULL;
}
static void draw_panic_plane(struct drm_plane *plane, const char *description)
{
struct drm_scanout_buffer sb = { };
int ret;
@ -642,6 +671,8 @@ static void draw_panic_plane(struct drm_plane *plane)
if (!drm_panic_trylock(plane->dev, flags))
return;
drm_panic_set_description(description);
ret = plane->helper_private->get_scanout_buffer(plane, &sb);
if (!ret && drm_panic_is_format_supported(sb.format)) {
@ -649,6 +680,7 @@ static void draw_panic_plane(struct drm_plane *plane)
if (plane->helper_private->panic_flush)
plane->helper_private->panic_flush(plane);
}
drm_panic_clear_description();
drm_panic_unlock(plane->dev, flags);
}
@ -662,7 +694,7 @@ static void drm_panic(struct kmsg_dumper *dumper, struct kmsg_dump_detail *detai
struct drm_plane *plane = to_drm_plane(dumper);
if (detail->reason == KMSG_DUMP_PANIC)
draw_panic_plane(plane);
draw_panic_plane(plane, detail->description);
}
@ -682,7 +714,7 @@ static ssize_t debugfs_trigger_write(struct file *file, const char __user *user_
if (kstrtobool_from_user(user_buf, count, &run) == 0 && run) {
struct drm_plane *plane = file->private_data;
draw_panic_plane(plane);
draw_panic_plane(plane, "Test from debugfs");
}
return count;
}