diff options
Diffstat (limited to 'drivers/gpu/drm/vkms/vkms_composer.c')
| -rw-r--r-- | drivers/gpu/drm/vkms/vkms_composer.c | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c new file mode 100644 index 000000000..33c031f27 --- /dev/null +++ b/drivers/gpu/drm/vkms/vkms_composer.c @@ -0,0 +1,316 @@ +// 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" + +static u32 get_pixel_from_buffer(int x, int y, const u8 *buffer, + const struct vkms_composer *composer) +{ + u32 pixel; + int src_offset = composer->offset + (y * composer->pitch) + + (x * composer->cpp); + + pixel = *(u32 *)&buffer[src_offset]; + + return pixel; +} + +/** + * compute_crc - Compute CRC value on output frame + * + * @vaddr: 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(const u8 *vaddr, + const struct vkms_composer *composer) +{ + int x, y; + u32 crc = 0, pixel = 0; + 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; + + for (y = y_src; y < y_src + h_src; ++y) { + for (x = x_src; x < x_src + w_src; ++x) { + pixel = get_pixel_from_buffer(x, y, vaddr, composer); + crc = crc32_le(crc, (void *)&pixel, sizeof(u32)); + } + } + + return crc; +} + +static u8 blend_channel(u8 src, u8 dst, u8 alpha) +{ + u32 pre_blend; + u8 new_color; + + pre_blend = (src * 255 + dst * (255 - alpha)); + + /* Faster div by 255 */ + new_color = ((pre_blend + ((pre_blend + 257) >> 8)) >> 8); + + return new_color; +} + +static void alpha_blending(const u8 *argb_src, u8 *argb_dst) +{ + u8 alpha; + + alpha = argb_src[3]; + argb_dst[0] = blend_channel(argb_src[0], argb_dst[0], alpha); + argb_dst[1] = blend_channel(argb_src[1], argb_dst[1], alpha); + argb_dst[2] = blend_channel(argb_src[2], argb_dst[2], alpha); + /* Opaque primary */ + argb_dst[3] = 0xFF; +} + +/** + * blend - blend value at vaddr_src with value at vaddr_dst + * @vaddr_dst: destination address + * @vaddr_src: source address + * @dst_composer: destination framebuffer's metadata + * @src_composer: source framebuffer's metadata + * + * Blend the vaddr_src value with the vaddr_dst value using the pre-multiplied + * alpha blending equation, since DRM currently assumes that the pixel color + * values have already been pre-multiplied with the alpha channel values. See + * more drm_plane_create_blend_mode_property(). This function uses buffer's + * metadata to locate the new composite values at vaddr_dst. + */ +static void blend(void *vaddr_dst, void *vaddr_src, + struct vkms_composer *dst_composer, + struct vkms_composer *src_composer) +{ + int i, j, j_dst, i_dst; + int offset_src, offset_dst; + u8 *pixel_dst, *pixel_src; + + 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 = dst_composer->offset + + (i_dst * dst_composer->pitch) + + (j_dst++ * dst_composer->cpp); + offset_src = src_composer->offset + + (i * src_composer->pitch) + + (j * src_composer->cpp); + + pixel_src = (u8 *)(vaddr_src + offset_src); + pixel_dst = (u8 *)(vaddr_dst + offset_dst); + alpha_blending(pixel_src, pixel_dst); + } + 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 int compose_planes(void **vaddr_out, + 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); + + if (!*vaddr_out) { + *vaddr_out = kzalloc(vkms_obj->gem.size, GFP_KERNEL); + if (!*vaddr_out) { + DRM_ERROR("Cannot allocate memory for output frame."); + return -ENOMEM; + } + } + + if (WARN_ON(!vkms_obj->vaddr)) + return -EINVAL; + + memcpy(*vaddr_out, vkms_obj->vaddr, vkms_obj->gem.size); + + if (cursor_composer) + compose_cursor(cursor_composer, primary_composer, *vaddr_out); + + return 0; +} + +/** + * 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; + bool crc_pending, wb_pending; + void *vaddr_out = NULL; + u32 crc32 = 0; + u64 frame_start, frame_end; + int ret; + + spin_lock_irq(&out->composer_lock); + frame_start = crtc_state->frame_start; + frame_end = crtc_state->frame_end; + crc_pending = crtc_state->crc_pending; + wb_pending = crtc_state->wb_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) + return; + + if (wb_pending) + vaddr_out = crtc_state->active_writeback; + + ret = compose_planes(&vaddr_out, primary_composer, cursor_composer); + if (ret) { + if (ret == -EINVAL && !wb_pending) + kfree(vaddr_out); + return; + } + + crc32 = compute_crc(vaddr_out, primary_composer); + + if (wb_pending) { + drm_writeback_signal_completion(&out->wb_connector, 0); + spin_lock_irq(&out->composer_lock); + crtc_state->wb_pending = false; + spin_unlock_irq(&out->composer_lock); + } else { + kfree(vaddr_out); + } + + /* + * 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; +} + +void vkms_set_composer(struct vkms_output *out, bool enabled) +{ + bool old_enabled; + + if (enabled) + drm_crtc_vblank_get(&out->crtc); + + spin_lock_irq(&out->lock); + old_enabled = out->composer_enabled; + out->composer_enabled = enabled; + spin_unlock_irq(&out->lock); + + if (old_enabled) + drm_crtc_vblank_put(&out->crtc); +} + +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); + + vkms_set_composer(out, enabled); + + return ret; +} |