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// SPDX-License-Identifier: GPL-2.0+
#include "vkms_drv.h"
#include <linux/crc32.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
/**
* compute_crc - Compute CRC value on output frame
*
* @vaddr_out: address to final framebuffer
* @crc_out: framebuffer's metadata
*
* returns CRC value computed using crc32 on the visible portion of
* the final framebuffer at vaddr_out
*/
static uint32_t compute_crc(void *vaddr_out, struct vkms_crc_data *crc_out)
{
int i, j, src_offset;
int x_src = crc_out->src.x1 >> 16;
int y_src = crc_out->src.y1 >> 16;
int h_src = drm_rect_height(&crc_out->src) >> 16;
int w_src = drm_rect_width(&crc_out->src) >> 16;
u32 crc = 0;
for (i = y_src; i < y_src + h_src; ++i) {
for (j = x_src; j < x_src + w_src; ++j) {
src_offset = crc_out->offset
+ (i * crc_out->pitch)
+ (j * crc_out->cpp);
/* XRGB format ignores Alpha channel */
memset(vaddr_out + src_offset + 24, 0, 8);
crc = crc32_le(crc, vaddr_out + src_offset,
sizeof(u32));
}
}
return crc;
}
/**
* blend - belnd value at vaddr_src with value at vaddr_dst
* @vaddr_dst: destination address
* @vaddr_src: source address
* @crc_dst: destination framebuffer's metadata
* @crc_src: source framebuffer's metadata
*
* Blend value at vaddr_src with value at vaddr_dst.
* Currently, this function write value at vaddr_src on value
* at vaddr_dst using buffer's metadata to locate the new values
* from vaddr_src and their distenation at vaddr_dst.
*
* Todo: Use the alpha value to blend vaddr_src with vaddr_dst
* instead of overwriting it.
*/
static void blend(void *vaddr_dst, void *vaddr_src,
struct vkms_crc_data *crc_dst,
struct vkms_crc_data *crc_src)
{
int i, j, j_dst, i_dst;
int offset_src, offset_dst;
int x_src = crc_src->src.x1 >> 16;
int y_src = crc_src->src.y1 >> 16;
int x_dst = crc_src->dst.x1;
int y_dst = crc_src->dst.y1;
int h_dst = drm_rect_height(&crc_src->dst);
int w_dst = drm_rect_width(&crc_src->dst);
int y_limit = y_src + h_dst;
int x_limit = x_src + w_dst;
for (i = y_src, i_dst = y_dst; i < y_limit; ++i) {
for (j = x_src, j_dst = x_dst; j < x_limit; ++j) {
offset_dst = crc_dst->offset
+ (i_dst * crc_dst->pitch)
+ (j_dst++ * crc_dst->cpp);
offset_src = crc_src->offset
+ (i * crc_src->pitch)
+ (j * crc_src->cpp);
memcpy(vaddr_dst + offset_dst,
vaddr_src + offset_src, sizeof(u32));
}
i_dst++;
}
}
static void compose_cursor(struct vkms_crc_data *cursor_crc,
struct vkms_crc_data *primary_crc, void *vaddr_out)
{
struct drm_gem_object *cursor_obj;
struct vkms_gem_object *cursor_vkms_obj;
cursor_obj = drm_gem_fb_get_obj(&cursor_crc->fb, 0);
cursor_vkms_obj = drm_gem_to_vkms_gem(cursor_obj);
mutex_lock(&cursor_vkms_obj->pages_lock);
if (!cursor_vkms_obj->vaddr) {
DRM_WARN("cursor plane vaddr is NULL");
goto out;
}
blend(vaddr_out, cursor_vkms_obj->vaddr, primary_crc, cursor_crc);
out:
mutex_unlock(&cursor_vkms_obj->pages_lock);
}
static uint32_t _vkms_get_crc(struct vkms_crc_data *primary_crc,
struct vkms_crc_data *cursor_crc)
{
struct drm_framebuffer *fb = &primary_crc->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);
void *vaddr_out = kzalloc(vkms_obj->gem.size, GFP_KERNEL);
u32 crc = 0;
if (!vaddr_out) {
DRM_ERROR("Failed to allocate memory for output frame.");
return 0;
}
mutex_lock(&vkms_obj->pages_lock);
if (WARN_ON(!vkms_obj->vaddr)) {
mutex_unlock(&vkms_obj->pages_lock);
kfree(vaddr_out);
return crc;
}
memcpy(vaddr_out, vkms_obj->vaddr, vkms_obj->gem.size);
mutex_unlock(&vkms_obj->pages_lock);
if (cursor_crc)
compose_cursor(cursor_crc, primary_crc, vaddr_out);
crc = compute_crc(vaddr_out, primary_crc);
kfree(vaddr_out);
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 vkms_crc_data *cursor_crc = NULL;
struct drm_plane *plane;
u32 crc32 = 0;
u64 frame_start, frame_end;
bool crc_pending;
spin_lock_irq(&out->crc_lock);
frame_start = crtc_state->frame_start;
frame_end = crtc_state->frame_end;
crc_pending = crtc_state->crc_pending;
crtc_state->frame_start = 0;
crtc_state->frame_end = 0;
crtc_state->crc_pending = false;
spin_unlock_irq(&out->crc_lock);
/*
* We raced with the vblank hrtimer and previous work already computed
* the crc, nothing to do.
*/
if (!crc_pending)
return;
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;
else
cursor_crc = crc_data;
}
if (primary_crc)
crc32 = _vkms_get_crc(primary_crc, cursor_crc);
/*
* The worker can fall behind the vblank hrtimer, make sure we catch up.
*/
while (frame_start <= frame_end)
drm_crtc_add_crc_entry(crtc, true, frame_start++, &crc32);
}
static const char * const pipe_crc_sources[] = {"auto"};
const char *const *vkms_get_crc_sources(struct drm_crtc *crtc,
size_t *count)
{
*count = ARRAY_SIZE(pipe_crc_sources);
return pipe_crc_sources;
}
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;
int ret = 0;
ret = vkms_crc_parse_source(src_name, &enabled);
spin_lock_irq(&out->lock);
out->crc_enabled = enabled;
spin_unlock_irq(&out->lock);
return ret;
}
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