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qemu-e2k/hw/vfio/display.c
Gerd Hoffmann b290659fc3 hw/vfio/display: add ramfb support 
So we have a boot display when using a vgpu as primary display.

ramfb depends on a fw_cfg file.  fw_cfg files can not be added and
removed at runtime, therefore a ramfb-enabled vfio device can't be
hotplugged.

Add a nohotplug variant of the vfio-pci device (as child class).  Add
the ramfb property to the nohotplug variant only.  So to enable the vgpu
display with boot support use this:

  -device vfio-pci-nohotplug,display=on,ramfb=on,sysfsdev=...

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2018-10-15 10:52:09 -06:00

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