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Commit 1a7aba7f authored by Jesse Barnes's avatar Jesse Barnes Committed by Jason Wessel
Browse files

drm: add KGDB/KDB support 



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

Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: default avatarJason Wessel <jason.wessel@windriver.com>
parent d219adc1

drivers/gpu/drm/drm_fb_helper.c

+74 −0
Original line number Diff line number Diff line
@@ -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;

include/drm/drm_crtc_helper.h

+2 −0
Original line number Diff line number Diff line
@@ -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);

include/drm/drm_fb_helper.h

+5 −0
Original line number Diff line number Diff line
@@ -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