diff options
Diffstat (limited to 'drivers/gpu/drm/vkms/vkms_crc.c')
| -rw-r--r-- | drivers/gpu/drm/vkms/vkms_crc.c | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vkms/vkms_crc.c b/drivers/gpu/drm/vkms/vkms_crc.c new file mode 100644 index 000000000000..9d9e8146db90 --- /dev/null +++ b/drivers/gpu/drm/vkms/vkms_crc.c @@ -0,0 +1,262 @@ +// 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; + 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; + else + cursor_crc = crc_data; + } + + if (primary_crc) + crc32 = _vkms_get_crc(primary_crc, cursor_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; +} |