8b818e059b
Wire up dmabuf-based display. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
348 lines
10 KiB
C
348 lines
10 KiB
C
/*
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* display support for mdev based vgpu devices
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*
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* Copyright Red Hat, Inc. 2017
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*
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* Authors:
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* Gerd Hoffmann
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include <linux/vfio.h>
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#include <sys/ioctl.h>
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#include "sysemu/sysemu.h"
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#include "ui/console.h"
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#include "qapi/error.h"
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#include "pci.h"
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#ifndef DRM_PLANE_TYPE_PRIMARY
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# define DRM_PLANE_TYPE_PRIMARY 1
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# define DRM_PLANE_TYPE_CURSOR 2
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#endif
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static void vfio_display_update_cursor(VFIODMABuf *dmabuf,
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struct vfio_device_gfx_plane_info *plane)
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{
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if (dmabuf->pos_x != plane->x_pos || dmabuf->pos_y != plane->y_pos) {
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dmabuf->pos_x = plane->x_pos;
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dmabuf->pos_y = plane->y_pos;
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dmabuf->pos_updates++;
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}
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if (dmabuf->hot_x != plane->x_hot || dmabuf->hot_y != plane->y_hot) {
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dmabuf->hot_x = plane->x_hot;
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dmabuf->hot_y = plane->y_hot;
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dmabuf->hot_updates++;
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}
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}
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static VFIODMABuf *vfio_display_get_dmabuf(VFIOPCIDevice *vdev,
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uint32_t plane_type)
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{
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VFIODisplay *dpy = vdev->dpy;
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struct vfio_device_gfx_plane_info plane;
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VFIODMABuf *dmabuf;
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int fd, ret;
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memset(&plane, 0, sizeof(plane));
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plane.argsz = sizeof(plane);
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plane.flags = VFIO_GFX_PLANE_TYPE_DMABUF;
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plane.drm_plane_type = plane_type;
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ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &plane);
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if (ret < 0) {
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return NULL;
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}
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if (!plane.drm_format || !plane.size) {
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return NULL;
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}
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QTAILQ_FOREACH(dmabuf, &dpy->dmabuf.bufs, next) {
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if (dmabuf->dmabuf_id == plane.dmabuf_id) {
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/* found in list, move to head, return it */
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QTAILQ_REMOVE(&dpy->dmabuf.bufs, dmabuf, next);
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QTAILQ_INSERT_HEAD(&dpy->dmabuf.bufs, dmabuf, next);
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if (plane_type == DRM_PLANE_TYPE_CURSOR) {
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vfio_display_update_cursor(dmabuf, &plane);
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}
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return dmabuf;
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}
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}
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fd = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_GFX_DMABUF, &plane.dmabuf_id);
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if (fd < 0) {
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return NULL;
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}
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dmabuf = g_new0(VFIODMABuf, 1);
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dmabuf->dmabuf_id = plane.dmabuf_id;
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dmabuf->buf.width = plane.width;
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dmabuf->buf.height = plane.height;
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dmabuf->buf.stride = plane.stride;
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dmabuf->buf.fourcc = plane.drm_format;
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dmabuf->buf.fd = fd;
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if (plane_type == DRM_PLANE_TYPE_CURSOR) {
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vfio_display_update_cursor(dmabuf, &plane);
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}
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QTAILQ_INSERT_HEAD(&dpy->dmabuf.bufs, dmabuf, next);
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return dmabuf;
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}
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static void vfio_display_free_one_dmabuf(VFIODisplay *dpy, VFIODMABuf *dmabuf)
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{
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QTAILQ_REMOVE(&dpy->dmabuf.bufs, dmabuf, next);
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dpy_gl_release_dmabuf(dpy->con, &dmabuf->buf);
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close(dmabuf->buf.fd);
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g_free(dmabuf);
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}
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static void vfio_display_free_dmabufs(VFIOPCIDevice *vdev)
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{
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VFIODisplay *dpy = vdev->dpy;
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VFIODMABuf *dmabuf, *tmp;
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uint32_t keep = 5;
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QTAILQ_FOREACH_SAFE(dmabuf, &dpy->dmabuf.bufs, next, tmp) {
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if (keep > 0) {
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keep--;
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continue;
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}
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assert(dmabuf != dpy->dmabuf.primary);
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vfio_display_free_one_dmabuf(dpy, dmabuf);
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}
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}
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static void vfio_display_dmabuf_update(void *opaque)
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{
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VFIOPCIDevice *vdev = opaque;
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VFIODisplay *dpy = vdev->dpy;
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VFIODMABuf *primary, *cursor;
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bool free_bufs = false, new_cursor = false;;
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primary = vfio_display_get_dmabuf(vdev, DRM_PLANE_TYPE_PRIMARY);
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if (primary == NULL) {
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return;
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}
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if (dpy->dmabuf.primary != primary) {
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dpy->dmabuf.primary = primary;
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qemu_console_resize(dpy->con,
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primary->buf.width, primary->buf.height);
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dpy_gl_scanout_dmabuf(dpy->con, &primary->buf);
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free_bufs = true;
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}
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cursor = vfio_display_get_dmabuf(vdev, DRM_PLANE_TYPE_CURSOR);
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if (dpy->dmabuf.cursor != cursor) {
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dpy->dmabuf.cursor = cursor;
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new_cursor = true;
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free_bufs = true;
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}
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if (cursor && (new_cursor || cursor->hot_updates)) {
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bool have_hot = (cursor->hot_x != 0xffffffff &&
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cursor->hot_y != 0xffffffff);
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dpy_gl_cursor_dmabuf(dpy->con, &cursor->buf, have_hot,
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cursor->hot_x, cursor->hot_y);
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cursor->hot_updates = 0;
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} else if (!cursor && new_cursor) {
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dpy_gl_cursor_dmabuf(dpy->con, NULL, false, 0, 0);
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}
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if (cursor && cursor->pos_updates) {
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dpy_gl_cursor_position(dpy->con,
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cursor->pos_x,
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cursor->pos_y);
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cursor->pos_updates = 0;
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}
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dpy_gl_update(dpy->con, 0, 0, primary->buf.width, primary->buf.height);
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if (free_bufs) {
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vfio_display_free_dmabufs(vdev);
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}
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}
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static const GraphicHwOps vfio_display_dmabuf_ops = {
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.gfx_update = vfio_display_dmabuf_update,
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};
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static int vfio_display_dmabuf_init(VFIOPCIDevice *vdev, Error **errp)
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{
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if (!display_opengl) {
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error_setg(errp, "vfio-display-dmabuf: opengl not available");
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return -1;
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}
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vdev->dpy = g_new0(VFIODisplay, 1);
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vdev->dpy->con = graphic_console_init(DEVICE(vdev), 0,
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&vfio_display_dmabuf_ops,
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vdev);
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return 0;
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}
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static void vfio_display_dmabuf_exit(VFIODisplay *dpy)
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{
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VFIODMABuf *dmabuf;
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if (QTAILQ_EMPTY(&dpy->dmabuf.bufs)) {
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return;
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}
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while ((dmabuf = QTAILQ_FIRST(&dpy->dmabuf.bufs)) != NULL) {
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vfio_display_free_one_dmabuf(dpy, dmabuf);
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}
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}
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/* ---------------------------------------------------------------------- */
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static void vfio_display_region_update(void *opaque)
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{
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VFIOPCIDevice *vdev = opaque;
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VFIODisplay *dpy = vdev->dpy;
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struct vfio_device_gfx_plane_info plane = {
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.argsz = sizeof(plane),
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.flags = VFIO_GFX_PLANE_TYPE_REGION
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};
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pixman_format_code_t format;
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int ret;
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ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &plane);
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if (ret < 0) {
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error_report("ioctl VFIO_DEVICE_QUERY_GFX_PLANE: %s",
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strerror(errno));
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return;
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}
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if (!plane.drm_format || !plane.size) {
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return;
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}
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format = qemu_drm_format_to_pixman(plane.drm_format);
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if (!format) {
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return;
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}
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if (dpy->region.buffer.size &&
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dpy->region.buffer.nr != plane.region_index) {
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/* region changed */
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vfio_region_exit(&dpy->region.buffer);
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vfio_region_finalize(&dpy->region.buffer);
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dpy->region.surface = NULL;
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}
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if (dpy->region.surface &&
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(surface_width(dpy->region.surface) != plane.width ||
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surface_height(dpy->region.surface) != plane.height ||
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surface_format(dpy->region.surface) != format)) {
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/* size changed */
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dpy->region.surface = NULL;
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}
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if (!dpy->region.buffer.size) {
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/* mmap region */
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ret = vfio_region_setup(OBJECT(vdev), &vdev->vbasedev,
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&dpy->region.buffer,
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plane.region_index,
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"display");
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if (ret != 0) {
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error_report("%s: vfio_region_setup(%d): %s",
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__func__, plane.region_index, strerror(-ret));
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goto err;
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}
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ret = vfio_region_mmap(&dpy->region.buffer);
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if (ret != 0) {
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error_report("%s: vfio_region_mmap(%d): %s", __func__,
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plane.region_index, strerror(-ret));
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goto err;
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}
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assert(dpy->region.buffer.mmaps[0].mmap != NULL);
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}
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if (dpy->region.surface == NULL) {
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/* create surface */
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dpy->region.surface = qemu_create_displaysurface_from
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(plane.width, plane.height, format,
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plane.stride, dpy->region.buffer.mmaps[0].mmap);
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dpy_gfx_replace_surface(dpy->con, dpy->region.surface);
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}
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/* full screen update */
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dpy_gfx_update(dpy->con, 0, 0,
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surface_width(dpy->region.surface),
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surface_height(dpy->region.surface));
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return;
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err:
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vfio_region_exit(&dpy->region.buffer);
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vfio_region_finalize(&dpy->region.buffer);
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}
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static const GraphicHwOps vfio_display_region_ops = {
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.gfx_update = vfio_display_region_update,
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};
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static int vfio_display_region_init(VFIOPCIDevice *vdev, Error **errp)
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{
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vdev->dpy = g_new0(VFIODisplay, 1);
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vdev->dpy->con = graphic_console_init(DEVICE(vdev), 0,
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&vfio_display_region_ops,
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vdev);
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return 0;
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}
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static void vfio_display_region_exit(VFIODisplay *dpy)
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{
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if (!dpy->region.buffer.size) {
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return;
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}
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vfio_region_exit(&dpy->region.buffer);
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vfio_region_finalize(&dpy->region.buffer);
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}
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/* ---------------------------------------------------------------------- */
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int vfio_display_probe(VFIOPCIDevice *vdev, Error **errp)
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{
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struct vfio_device_gfx_plane_info probe;
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int ret;
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memset(&probe, 0, sizeof(probe));
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probe.argsz = sizeof(probe);
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probe.flags = VFIO_GFX_PLANE_TYPE_PROBE | VFIO_GFX_PLANE_TYPE_DMABUF;
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ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &probe);
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if (ret == 0) {
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return vfio_display_dmabuf_init(vdev, errp);
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}
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memset(&probe, 0, sizeof(probe));
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probe.argsz = sizeof(probe);
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probe.flags = VFIO_GFX_PLANE_TYPE_PROBE | VFIO_GFX_PLANE_TYPE_REGION;
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ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &probe);
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if (ret == 0) {
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return vfio_display_region_init(vdev, errp);
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}
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if (vdev->display == ON_OFF_AUTO_AUTO) {
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/* not an error in automatic mode */
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return 0;
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}
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error_setg(errp, "vfio: device doesn't support any (known) display method");
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return -1;
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}
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void vfio_display_finalize(VFIOPCIDevice *vdev)
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{
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if (!vdev->dpy) {
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return;
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}
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graphic_console_close(vdev->dpy->con);
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vfio_display_dmabuf_exit(vdev->dpy);
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vfio_display_region_exit(vdev->dpy);
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g_free(vdev->dpy);
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}
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