linux-core/drm_crtc.c


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#include <linux/list.h>
#include "drmP.h"
#include "drm.h"
#include "drm_crtc.h"

int drm_mode_idr_get(struct drm_device *dev, void *ptr)
{
	int new_id = 0;
	int ret;
again:
	if (idr_pre_get(&dev->mode_config.crtc_idr, GFP_KERNEL) == 0) {
		DRM_ERROR("Ran out memory getting a mode number\n");
		return 0;
	}

	spin_lock(&dev->mode_config.config_lock);

	ret = idr_get_new_above(&dev->mode_config.crtc_idr, ptr, 1, &new_id);
	if (ret == -EAGAIN) {
		spin_unlock(&dev->mode_config.config_lock);
		goto again;
	}	

	spin_unlock(&dev->mode_config.config_lock);
	return new_id;
}

void drm_mode_idr_put(struct drm_device *dev, int id)
{
	idr_remove(&dev->mode_config.crtc_idr, id);
}

struct drm_framebuffer *drm_framebuffer_create(drm_device_t *dev)
{
	struct drm_framebuffer *fb;

	spin_lock(&dev->mode_config.config_lock);
	/* Limit to single framebuffer for now */
	if (dev->mode_config.num_fb > 1) {
		DRM_ERROR("Attempt to add multiple framebuffers failed\n");
		return NULL;
	}
	spin_unlock(&dev->mode_config.config_lock);

	fb = kzalloc(sizeof(struct drm_framebuffer), GFP_KERNEL);
	if (!fb) {

		return NULL;
	}
	
	fb->id = drm_mode_idr_get(dev, fb);
	fb->dev = dev;
	spin_lock(&dev->mode_config.config_lock);
	dev->mode_config.num_fb++;
	list_add(&fb->head, &dev->mode_config.fb_list);
	spin_unlock(&dev->mode_config.config_lock);

	return fb;
}

void drm_framebuffer_destroy(struct drm_framebuffer *fb)
{
	drm_device_t *dev = fb->dev;

	spin_lock(&dev->mode_config.config_lock);
	drm_mode_idr_put(dev, fb->id);
	list_del(&fb->head);
	dev->mode_config.num_fb--;
	spin_unlock(&dev->mode_config.config_lock);

	kfree(fb);
}

struct drm_crtc *drm_crtc_create(drm_device_t *dev,
				 const struct drm_crtc_funcs *funcs)
{
	struct drm_crtc *crtc;

	crtc = kzalloc(sizeof(struct drm_crtc), GFP_KERNEL);
	if (!crtc)
		return NULL;

	crtc->dev = dev;
	crtc->funcs = funcs;

	crtc->id = drm_mode_idr_get(dev, crtc);

	spin_lock(&dev->mode_config.config_lock);
	list_add_tail(&crtc->head, &dev->mode_config.crtc_list);
	dev->mode_config.num_crtc++;
	spin_unlock(&dev->mode_config.config_lock);

	return crtc;
}
EXPORT_SYMBOL(drm_crtc_create);

void drm_crtc_destroy(struct drm_crtc *crtc)
{
	drm_device_t *dev = crtc->dev;

	if (crtc->funcs->cleanup)
		(*crtc->funcs->cleanup)(crtc);


	spin_lock(&dev->mode_config.config_lock);
	drm_mode_idr_put(dev, crtc->id);
	list_del(&crtc->head);
	dev->mode_config.num_crtc--;
	spin_unlock(&dev->mode_config.config_lock);
	kfree(crtc);
}
EXPORT_SYMBOL(drm_crtc_destroy);

bool drm_crtc_in_use(struct drm_crtc *crtc)
{
	struct drm_output *output;
	drm_device_t *dev = crtc->dev;
	/* FIXME: Locking around list access? */
	list_for_each_entry(output, &dev->mode_config.output_list, head)
		if (output->crtc == crtc)
			return true;
	return false;
}
EXPORT_SYMBOL(drm_crtc_in_use);

void drm_crtc_probe_output_modes(struct drm_device *dev, int maxX, int maxY)
{
	struct drm_output *output;
	struct drm_display_mode *mode, *t;
	int ret;
	//if (maxX == 0 || maxY == 0) 
	// TODO

	list_for_each_entry(output, &dev->mode_config.output_list, head) {
		
		list_for_each_entry_safe(mode, t, &output->modes, head)
			drm_mode_remove(output, mode);
		
		output->status = (*output->funcs->detect)(output);

		if (output->status == output_status_disconnected) {
			/* TODO set EDID to NULL */
			continue;
		}

		ret = (*output->funcs->get_modes)(output);

		if (ret) {
			/* move the modes over to the main mode list */
			drm_mode_list_concat(&output->probed_modes,
					     &output->modes);
		}

		if (maxX && maxY)
			drm_mode_validate_size(dev, &output->modes, maxX,
					       maxY, 0);