drivers/gpu/drm/vkms/vkms_crtc.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/vkms/vkms_crtc.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/vkms/vkms_crtc.c
Extension
.c
Size
6554 bytes
Lines
242
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0+

#include <linux/dma-fence.h>

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_blend.h>
#include <drm/drm_managed.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>
#include <drm/drm_vblank_helper.h>

#include "vkms_drv.h"

static bool vkms_crtc_handle_vblank_timeout(struct drm_crtc *crtc)
{
	struct vkms_output *output = drm_crtc_to_vkms_output(crtc);
	struct vkms_crtc_state *state;
	bool ret, fence_cookie;

	fence_cookie = dma_fence_begin_signalling();

	spin_lock(&output->lock);
	ret = drm_crtc_handle_vblank(crtc);
	if (!ret)
		DRM_ERROR("vkms failure on handling vblank");

	state = output->composer_state;
	spin_unlock(&output->lock);

	if (state && output->composer_enabled) {
		u64 frame = drm_crtc_accurate_vblank_count(crtc);

		/* update frame_start only if a queued vkms_composer_worker()
		 * has read the data
		 */
		spin_lock(&output->composer_lock);
		if (!state->crc_pending)
			state->frame_start = frame;
		else
			DRM_DEBUG_DRIVER("crc worker falling behind, frame_start: %llu, frame_end: %llu\n",
					 state->frame_start, frame);
		state->frame_end = frame;
		state->crc_pending = true;
		spin_unlock(&output->composer_lock);

		ret = queue_work(output->composer_workq, &state->composer_work);
		if (!ret)
			DRM_DEBUG_DRIVER("Composer worker already queued\n");
	}

	dma_fence_end_signalling(fence_cookie);

	return true;
}

static struct drm_crtc_state *
vkms_atomic_crtc_duplicate_state(struct drm_crtc *crtc)
{
	struct vkms_crtc_state *vkms_state;

	if (WARN_ON(!crtc->state))
		return NULL;

	vkms_state = kzalloc_obj(*vkms_state);
	if (!vkms_state)
		return NULL;

	__drm_atomic_helper_crtc_duplicate_state(crtc, &vkms_state->base);

	INIT_WORK(&vkms_state->composer_work, vkms_composer_worker);

	return &vkms_state->base;
}

static void vkms_atomic_crtc_destroy_state(struct drm_crtc *crtc,
					   struct drm_crtc_state *state)
{
	struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(state);

	__drm_atomic_helper_crtc_destroy_state(state);

	WARN_ON(work_pending(&vkms_state->composer_work));
	kfree(vkms_state->active_planes);
	kfree(vkms_state);
}

static void vkms_atomic_crtc_reset(struct drm_crtc *crtc)
{

Annotation

Implementation Notes