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drm: add KGDB/KDB support 

Implement the callbacks for KDB entry/exit via the drm helpers.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
This commit is contained in:
Jesse Barnes 2010-08-05 09:22:31 -05:00 committed by Jason Wessel
parent d219adc122
commit 1a7aba7f4e
3 changed files with 81 additions and 0 deletions
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74
drivers/gpu/drm/drm_fb_helper.c
View File

@ -241,6 +241,80 @@ static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
return 0;
}
int drm_fb_helper_debug_enter(struct fb_info *info)
{
struct drm_fb_helper *helper = info->par;
struct drm_crtc_helper_funcs *funcs;
int i;
if (list_empty(&kernel_fb_helper_list))
return false;
list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
for (i = 0; i < helper->crtc_count; i++) {
struct drm_mode_set *mode_set =
&helper->crtc_info[i].mode_set;
if (!mode_set->crtc->enabled)
continue;
funcs = mode_set->crtc->helper_private;
funcs->mode_set_base_atomic(mode_set->crtc,
mode_set->fb,
mode_set->x,
mode_set->y);
}
}
return 0;
}
EXPORT_SYMBOL(drm_fb_helper_debug_enter);
/* Find the real fb for a given fb helper CRTC */
static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
{
struct drm_device *dev = crtc->dev;
struct drm_crtc *c;
list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
if (crtc->base.id == c->base.id)
return c->fb;
}
return NULL;
}
int drm_fb_helper_debug_leave(struct fb_info *info)
{
struct drm_fb_helper *helper = info->par;
struct drm_crtc *crtc;
struct drm_crtc_helper_funcs *funcs;
struct drm_framebuffer *fb;
int i;
for (i = 0; i < helper->crtc_count; i++) {
struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
crtc = mode_set->crtc;
funcs = crtc->helper_private;
fb = drm_mode_config_fb(crtc);
if (!crtc->enabled)
continue;
if (!fb) {
DRM_ERROR("no fb to restore??\n");
continue;
}
funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
crtc->y);
}
return 0;
}
EXPORT_SYMBOL(drm_fb_helper_debug_leave);
bool drm_fb_helper_force_kernel_mode(void)
{
int i = 0;

2
include/drm/drm_crtc_helper.h
View File

@ -60,6 +60,8 @@ struct drm_crtc_helper_funcs {
/* Move the crtc on the current fb to the given position *optional* */
int (*mode_set_base)(struct drm_crtc *crtc, int x, int y,
struct drm_framebuffer *old_fb);
int (*mode_set_base_atomic)(struct drm_crtc *crtc,
struct drm_framebuffer *fb, int x, int y);
/* reload the current crtc LUT */
void (*load_lut)(struct drm_crtc *crtc);

5
include/drm/drm_fb_helper.h
View File

@ -32,6 +32,8 @@
struct drm_fb_helper;
#include <linux/kgdb.h>
struct drm_fb_helper_crtc {
uint32_t crtc_id;
struct drm_mode_set mode_set;
@ -78,6 +80,7 @@ struct drm_fb_helper_connector {
struct drm_fb_helper {
struct drm_framebuffer *fb;
struct drm_framebuffer *saved_fb;
struct drm_device *dev;
struct drm_display_mode *mode;
int crtc_count;
@ -126,5 +129,7 @@ int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);
bool drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel);
int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper);
int drm_fb_helper_debug_enter(struct fb_info *info);
int drm_fb_helper_debug_leave(struct fb_info *info);
#endif