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path: root/drivers/gpu/drm/vkms/vkms_crc.c
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Diffstat (limited to 'drivers/gpu/drm/vkms/vkms_crc.c')
-rw-r--r--drivers/gpu/drm/vkms/vkms_crc.c262
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;
+}