| // SPDX-License-Identifier: GPL-2.0+ |
| |
| #include <linux/crc32.h> |
| |
| #include <drm/drm_atomic.h> |
| #include <drm/drm_atomic_helper.h> |
| #include <drm/drm_gem_framebuffer_helper.h> |
| #include <drm/drm_vblank.h> |
| |
| #include "vkms_drv.h" |
| |
| /** |
| * compute_crc - Compute CRC value on output frame |
| * |
| * @vaddr_out: address to final framebuffer |
| * @composer: 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_composer *composer) |
| { |
| int i, j, src_offset; |
| int x_src = composer->src.x1 >> 16; |
| int y_src = composer->src.y1 >> 16; |
| int h_src = drm_rect_height(&composer->src) >> 16; |
| int w_src = drm_rect_width(&composer->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 = composer->offset |
| + (i * composer->pitch) |
| + (j * composer->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 |
| * @dest_composer: destination framebuffer's metadata |
| * @src_composer: 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_composer *dest_composer, |
| struct vkms_composer *src_composer) |
| { |
| int i, j, j_dst, i_dst; |
| int offset_src, offset_dst; |
| |
| int x_src = src_composer->src.x1 >> 16; |
| int y_src = src_composer->src.y1 >> 16; |
| |
| int x_dst = src_composer->dst.x1; |
| int y_dst = src_composer->dst.y1; |
| int h_dst = drm_rect_height(&src_composer->dst); |
| int w_dst = drm_rect_width(&src_composer->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 = dest_composer->offset |
| + (i_dst * dest_composer->pitch) |
| + (j_dst++ * dest_composer->cpp); |
| offset_src = src_composer->offset |
| + (i * src_composer->pitch) |
| + (j * src_composer->cpp); |
| |
| memcpy(vaddr_dst + offset_dst, |
| vaddr_src + offset_src, sizeof(u32)); |
| } |
| i_dst++; |
| } |
| } |
| |
| static void compose_cursor(struct vkms_composer *cursor_composer, |
| struct vkms_composer *primary_composer, |
| void *vaddr_out) |
| { |
| struct drm_gem_object *cursor_obj; |
| struct vkms_gem_object *cursor_vkms_obj; |
| |
| cursor_obj = drm_gem_fb_get_obj(&cursor_composer->fb, 0); |
| cursor_vkms_obj = drm_gem_to_vkms_gem(cursor_obj); |
| |
| if (WARN_ON(!cursor_vkms_obj->vaddr)) |
| return; |
| |
| blend(vaddr_out, cursor_vkms_obj->vaddr, |
| primary_composer, cursor_composer); |
| } |
| |
| static uint32_t _vkms_get_crc(struct vkms_composer *primary_composer, |
| struct vkms_composer *cursor_composer) |
| { |
| struct drm_framebuffer *fb = &primary_composer->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; |
| } |
| |
| if (WARN_ON(!vkms_obj->vaddr)) { |
| kfree(vaddr_out); |
| return crc; |
| } |
| |
| memcpy(vaddr_out, vkms_obj->vaddr, vkms_obj->gem.size); |
| |
| if (cursor_composer) |
| compose_cursor(cursor_composer, primary_composer, vaddr_out); |
| |
| crc = compute_crc(vaddr_out, primary_composer); |
| |
| kfree(vaddr_out); |
| |
| return crc; |
| } |
| |
| /** |
| * vkms_composer_worker - ordered work_struct to compute CRC |
| * |
| * @work: work_struct |
| * |
| * Work handler for composing and 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_composer_worker(struct work_struct *work) |
| { |
| struct vkms_crtc_state *crtc_state = container_of(work, |
| struct vkms_crtc_state, |
| composer_work); |
| struct drm_crtc *crtc = crtc_state->base.crtc; |
| struct vkms_output *out = drm_crtc_to_vkms_output(crtc); |
| struct vkms_composer *primary_composer = NULL; |
| struct vkms_composer *cursor_composer = NULL; |
| u32 crc32 = 0; |
| u64 frame_start, frame_end; |
| bool crc_pending; |
| |
| spin_lock_irq(&out->composer_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->composer_lock); |
| |
| /* |
| * We raced with the vblank hrtimer and previous work already computed |
| * the crc, nothing to do. |
| */ |
| if (!crc_pending) |
| return; |
| |
| if (crtc_state->num_active_planes >= 1) |
| primary_composer = crtc_state->active_planes[0]->composer; |
| |
| if (crtc_state->num_active_planes == 2) |
| cursor_composer = crtc_state->active_planes[1]->composer; |
| |
| if (primary_composer) |
| crc32 = _vkms_get_crc(primary_composer, cursor_composer); |
| |
| /* |
| * 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->composer_enabled = enabled; |
| spin_unlock_irq(&out->lock); |
| |
| return ret; |
| } |