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// SPDX-License-Identifier: GPL-2.0
#include "vkms_drv.h"
#include <linux/crc32.h>
#include <drm/drm_gem_framebuffer_helper.h>
static uint32_t _vkms_get_crc(struct vkms_crc_data *crc_data)
{
struct drm_framebuffer *fb = &crc_data->fb;
struct drm_gem_object *gem_obj = drm_gem_fb_get_obj(fb, 0);
struct vkms_gem_object *vkms_obj = drm_gem_to_vkms_gem(gem_obj);
u32 crc = 0;
int i = 0;
unsigned int x = crc_data->src.x1 >> 16;
unsigned int y = crc_data->src.y1 >> 16;
unsigned int height = drm_rect_height(&crc_data->src) >> 16;
unsigned int width = drm_rect_width(&crc_data->src) >> 16;
unsigned int cpp = fb->format->cpp[0];
unsigned int src_offset;
unsigned int size_byte = width * cpp;
void *vaddr;
mutex_lock(&vkms_obj->pages_lock);
vaddr = vkms_obj->vaddr;
if (WARN_ON(!vaddr))
goto out;
for (i = y; i < y + height; i++) {
src_offset = fb->offsets[0] + (i * fb->pitches[0]) + (x * cpp);
crc = crc32_le(crc, vaddr + src_offset, size_byte);
}
out:
mutex_unlock(&vkms_obj->pages_lock);
return crc;
}
/**
* vkms_crc_work_handle - ordered work_struct to compute CRC
*
* @work: work_struct
*
* Work handler for computing CRCs. work_struct scheduled in
* an ordered workqueue that's periodically scheduled to run by
* _vblank_handle() and flushed at vkms_atomic_crtc_destroy_state().
*/
void vkms_crc_work_handle(struct work_struct *work)
{
struct vkms_crtc_state *crtc_state = container_of(work,
struct vkms_crtc_state,
crc_work);
struct drm_crtc *crtc = crtc_state->base.crtc;
struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
struct vkms_device *vdev = container_of(out, struct vkms_device,
output);
struct vkms_crc_data *primary_crc = NULL;
struct drm_plane *plane;
u32 crc32 = 0;
u64 frame_start, frame_end;
unsigned long flags;
spin_lock_irqsave(&out->state_lock, flags);
frame_start = crtc_state->frame_start;
frame_end = crtc_state->frame_end;
spin_unlock_irqrestore(&out->state_lock, flags);
/* _vblank_handle() hasn't updated frame_start yet */
if (!frame_start || frame_start == frame_end)
goto out;
drm_for_each_plane(plane, &vdev->drm) {
struct vkms_plane_state *vplane_state;
struct vkms_crc_data *crc_data;
vplane_state = to_vkms_plane_state(plane->state);
crc_data = vplane_state->crc_data;
if (drm_framebuffer_read_refcount(&crc_data->fb) == 0)
continue;
if (plane->type == DRM_PLANE_TYPE_PRIMARY) {
primary_crc = crc_data;
break;
}
}
if (primary_crc)
crc32 = _vkms_get_crc(primary_crc);
frame_end = drm_crtc_accurate_vblank_count(crtc);
/* queue_work can fail to schedule crc_work; add crc for
* missing frames
*/
while (frame_start <= frame_end)
drm_crtc_add_crc_entry(crtc, true, frame_start++, &crc32);
out:
/* to avoid using the same value for frame number again */
spin_lock_irqsave(&out->state_lock, flags);
crtc_state->frame_end = frame_end;
crtc_state->frame_start = 0;
spin_unlock_irqrestore(&out->state_lock, flags);
}
static int vkms_crc_parse_source(const char *src_name, bool *enabled)
{
int ret = 0;
if (!src_name) {
*enabled = false;
} else if (strcmp(src_name, "auto") == 0) {
*enabled = true;
} else {
*enabled = false;
ret = -EINVAL;
}
return ret;
}
int vkms_verify_crc_source(struct drm_crtc *crtc, const char *src_name,
size_t *values_cnt)
{
bool enabled;
if (vkms_crc_parse_source(src_name, &enabled) < 0) {
DRM_DEBUG_DRIVER("unknown source %s\n", src_name);
return -EINVAL;
}
*values_cnt = 1;
return 0;
}
int vkms_set_crc_source(struct drm_crtc *crtc, const char *src_name)
{
struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
bool enabled = false;
unsigned long flags;
int ret = 0;
ret = vkms_crc_parse_source(src_name, &enabled);
/* make sure nothing is scheduled on crtc workq */
flush_workqueue(out->crc_workq);
spin_lock_irqsave(&out->lock, flags);
out->crc_enabled = enabled;
spin_unlock_irqrestore(&out->lock, flags);
return ret;
}
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