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FRET-qemu/contrib/vhost-user-gpu/vhost-user-gpu.c
Erico Nunes c06444261e contrib/vhost-user-gpu: implement get_edid feature 
Implement the virtio-gpu feature in contrib/vhost-user-gpu, which was
unsupported until now.
In this implementation, the feature is enabled inconditionally to avoid
creating another optional config argument.
Similarly to get_display_info, vhost-user-gpu sends a message back to
the frontend to have access to all the display information. In the
case of get_edid, it also needs to pass which scanout we should
retrieve the edid for.

The VHOST_USER_GPU_PROTOCOL_F_EDID protocol feature is required if the
frontend sets the VIRTIO_GPU_F_EDID virtio-gpu feature. If the frontend
sets the virtio-gpu feature but does not support the protocol feature,
the backend will abort with an error.

Signed-off-by: Erico Nunes <ernunes@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20230626164708.1163239-4-ernunes@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2023-07-10 16:17:07 -04:00

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/*
* Virtio vhost-user GPU Device
*
* Copyright Red Hat, Inc. 2013-2018
*
* Authors:
* Dave Airlie <airlied@redhat.com>
* Gerd Hoffmann <kraxel@redhat.com>
* Marc-André Lureau <marcandre.lureau@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/drm.h"
#include "qapi/error.h"
#include "qemu/sockets.h"
#include <pixman.h>
#include <glib-unix.h>
#include "vugpu.h"
#include "hw/virtio/virtio-gpu-bswap.h"
#include "hw/virtio/virtio-gpu-pixman.h"
#include "virgl.h"
#include "vugbm.h"
enum {
VHOST_USER_GPU_MAX_QUEUES = 2,
};
struct virtio_gpu_simple_resource {
uint32_t resource_id;
uint32_t width;
uint32_t height;
uint32_t format;
struct iovec *iov;
unsigned int iov_cnt;
uint32_t scanout_bitmask;
pixman_image_t *image;
struct vugbm_buffer buffer;
QTAILQ_ENTRY(virtio_gpu_simple_resource) next;
};
static gboolean opt_print_caps;
static int opt_fdnum = -1;
static char *opt_socket_path;
static char *opt_render_node;
static gboolean opt_virgl;
static void vg_handle_ctrl(VuDev *dev, int qidx);
static void vg_cleanup_mapping(VuGpu *g,
struct virtio_gpu_simple_resource *res);
static const char *
vg_cmd_to_string(int cmd)
{
#define CMD(cmd) [cmd] = #cmd
static const char *vg_cmd_str[] = {
CMD(VIRTIO_GPU_UNDEFINED),
/* 2d commands */
CMD(VIRTIO_GPU_CMD_GET_DISPLAY_INFO),
CMD(VIRTIO_GPU_CMD_RESOURCE_CREATE_2D),
CMD(VIRTIO_GPU_CMD_RESOURCE_UNREF),
CMD(VIRTIO_GPU_CMD_SET_SCANOUT),
CMD(VIRTIO_GPU_CMD_RESOURCE_FLUSH),
CMD(VIRTIO_GPU_CMD_TRANSFER_TO_HOST_2D),
CMD(VIRTIO_GPU_CMD_RESOURCE_ATTACH_BACKING),
CMD(VIRTIO_GPU_CMD_RESOURCE_DETACH_BACKING),
CMD(VIRTIO_GPU_CMD_GET_CAPSET_INFO),
CMD(VIRTIO_GPU_CMD_GET_CAPSET),
/* 3d commands */
CMD(VIRTIO_GPU_CMD_CTX_CREATE),
CMD(VIRTIO_GPU_CMD_CTX_DESTROY),
CMD(VIRTIO_GPU_CMD_CTX_ATTACH_RESOURCE),
CMD(VIRTIO_GPU_CMD_CTX_DETACH_RESOURCE),
CMD(VIRTIO_GPU_CMD_RESOURCE_CREATE_3D),
CMD(VIRTIO_GPU_CMD_TRANSFER_TO_HOST_3D),
CMD(VIRTIO_GPU_CMD_TRANSFER_FROM_HOST_3D),
CMD(VIRTIO_GPU_CMD_SUBMIT_3D),
/* cursor commands */
CMD(VIRTIO_GPU_CMD_UPDATE_CURSOR),
CMD(VIRTIO_GPU_CMD_MOVE_CURSOR),
};
#undef REQ
if (cmd >= 0 && cmd < G_N_ELEMENTS(vg_cmd_str)) {
return vg_cmd_str[cmd];
} else {
return "unknown";
}
}
static int
vg_sock_fd_read(int sock, void *buf, ssize_t buflen)
{
int ret;
do {
ret = read(sock, buf, buflen);
} while (ret < 0 && (errno == EINTR || errno == EAGAIN));
g_warn_if_fail(ret == buflen);
return ret;
}
static void
vg_sock_fd_close(VuGpu *g)
{
if (g->sock_fd >= 0) {
close(g->sock_fd);
g->sock_fd = -1;
}
}
static gboolean
source_wait_cb(gint fd, GIOCondition condition, gpointer user_data)
{
VuGpu *g = user_data;
if (!vg_recv_msg(g, VHOST_USER_GPU_DMABUF_UPDATE, 0, NULL)) {
return G_SOURCE_CONTINUE;
}
/* resume */
g->wait_in = 0;
vg_handle_ctrl(&g->dev.parent, 0);
return G_SOURCE_REMOVE;
}
void
vg_wait_ok(VuGpu *g)
{
assert(g->wait_in == 0);
g->wait_in = g_unix_fd_add(g->sock_fd, G_IO_IN | G_IO_HUP,
source_wait_cb, g);
}
static int
vg_sock_fd_write(int sock, const void *buf, ssize_t buflen, int fd)
{
ssize_t ret;
struct iovec iov = {
.iov_base = (void *)buf,
.iov_len = buflen,
};
struct msghdr msg = {
.msg_iov = &iov,
.msg_iovlen = 1,
};
union {
struct cmsghdr cmsghdr;
char control[CMSG_SPACE(sizeof(int))];
} cmsgu;
struct cmsghdr *cmsg;
if (fd != -1) {
msg.msg_control = cmsgu.control;
msg.msg_controllen = sizeof(cmsgu.control);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
*((int *)CMSG_DATA(cmsg)) = fd;
}
do {
ret = sendmsg(sock, &msg, 0);
} while (ret == -1 && (errno == EINTR || errno == EAGAIN));
g_warn_if_fail(ret == buflen);
return ret;
}
void
vg_send_msg(VuGpu *vg, const VhostUserGpuMsg *msg, int fd)
{
if (vg_sock_fd_write(vg->sock_fd, msg,
VHOST_USER_GPU_HDR_SIZE + msg->size, fd) < 0) {
vg_sock_fd_close(vg);
}
}
bool
vg_recv_msg(VuGpu *g, uint32_t expect_req, uint32_t expect_size,
gpointer payload)
{
uint32_t req, flags, size;
if (vg_sock_fd_read(g->sock_fd, &req, sizeof(req)) < 0 ||
vg_sock_fd_read(g->sock_fd, &flags, sizeof(flags)) < 0 ||
vg_sock_fd_read(g->sock_fd, &size, sizeof(size)) < 0) {
goto err;
}
g_return_val_if_fail(req == expect_req, false);
g_return_val_if_fail(flags & VHOST_USER_GPU_MSG_FLAG_REPLY, false);
g_return_val_if_fail(size == expect_size, false);
if (size && vg_sock_fd_read(g->sock_fd, payload, size) != size) {
goto err;
}
return true;
err:
vg_sock_fd_close(g);
return false;
}
static struct virtio_gpu_simple_resource *
virtio_gpu_find_resource(VuGpu *g, uint32_t resource_id)
{
struct virtio_gpu_simple_resource *res;
QTAILQ_FOREACH(res, &g->reslist, next) {
if (res->resource_id == resource_id) {
return res;
}
}
return NULL;
}
void
vg_ctrl_response(VuGpu *g,
struct virtio_gpu_ctrl_command *cmd,
struct virtio_gpu_ctrl_hdr *resp,
size_t resp_len)
{
size_t s;
if (cmd->cmd_hdr.flags & VIRTIO_GPU_FLAG_FENCE) {
resp->flags |= VIRTIO_GPU_FLAG_FENCE;
resp->fence_id = cmd->cmd_hdr.fence_id;
resp->ctx_id = cmd->cmd_hdr.ctx_id;
}
virtio_gpu_ctrl_hdr_bswap(resp);
s = iov_from_buf(cmd->elem.in_sg, cmd->elem.in_num, 0, resp, resp_len);
if (s != resp_len) {
g_critical("%s: response size incorrect %zu vs %zu",
__func__, s, resp_len);
}
vu_queue_push(&g->dev.parent, cmd->vq, &cmd->elem, s);
vu_queue_notify(&g->dev.parent, cmd->vq);
cmd->state = VG_CMD_STATE_FINISHED;
}
void
vg_ctrl_response_nodata(VuGpu *g,
struct virtio_gpu_ctrl_command *cmd,
enum virtio_gpu_ctrl_type type)
{
struct virtio_gpu_ctrl_hdr resp = {
.type = type,
};
vg_ctrl_response(g, cmd, &resp, sizeof(resp));
}
static gboolean
get_display_info_cb(gint fd, GIOCondition condition, gpointer user_data)
{
struct virtio_gpu_resp_display_info dpy_info = { {} };
VuGpu *vg = user_data;
struct virtio_gpu_ctrl_command *cmd = QTAILQ_LAST(&vg->fenceq);
g_debug("disp info cb");
assert(cmd->cmd_hdr.type == VIRTIO_GPU_CMD_GET_DISPLAY_INFO);
if (!vg_recv_msg(vg, VHOST_USER_GPU_GET_DISPLAY_INFO,
sizeof(dpy_info), &dpy_info)) {
return G_SOURCE_CONTINUE;
}
QTAILQ_REMOVE(&vg->fenceq, cmd, next);
vg_ctrl_response(vg, cmd, &dpy_info.hdr, sizeof(dpy_info));
vg->wait_in = 0;
vg_handle_ctrl(&vg->dev.parent, 0);
return G_SOURCE_REMOVE;
}
void
vg_get_display_info(VuGpu *vg, struct virtio_gpu_ctrl_command *cmd)
{
VhostUserGpuMsg msg = {
.request = VHOST_USER_GPU_GET_DISPLAY_INFO,
.size = 0,
};
assert(vg->wait_in == 0);
vg_send_msg(vg, &msg, -1);
vg->wait_in = g_unix_fd_add(vg->sock_fd, G_IO_IN | G_IO_HUP,
get_display_info_cb, vg);
cmd->state = VG_CMD_STATE_PENDING;
}
static gboolean
get_edid_cb(gint fd, GIOCondition condition, gpointer user_data)
{
struct virtio_gpu_resp_edid resp_edid;
VuGpu *vg = user_data;
struct virtio_gpu_ctrl_command *cmd = QTAILQ_LAST(&vg->fenceq);
g_debug("get edid cb");
assert(cmd->cmd_hdr.type == VIRTIO_GPU_CMD_GET_EDID);
if (!vg_recv_msg(vg, VHOST_USER_GPU_GET_EDID,
sizeof(resp_edid), &resp_edid)) {
return G_SOURCE_CONTINUE;
}
QTAILQ_REMOVE(&vg->fenceq, cmd, next);
vg_ctrl_response(vg, cmd, &resp_edid.hdr, sizeof(resp_edid));
vg->wait_in = 0;
vg_handle_ctrl(&vg->dev.parent, 0);
return G_SOURCE_REMOVE;
}
void
vg_get_edid(VuGpu *vg, struct virtio_gpu_ctrl_command *cmd)
{
struct virtio_gpu_cmd_get_edid get_edid;
VUGPU_FILL_CMD(get_edid);
virtio_gpu_bswap_32(&get_edid, sizeof(get_edid));
VhostUserGpuMsg msg = {
.request = VHOST_USER_GPU_GET_EDID,
.size = sizeof(VhostUserGpuEdidRequest),
.payload.edid_req = {
.scanout_id = get_edid.scanout,
},
};
assert(vg->wait_in == 0);
vg_send_msg(vg, &msg, -1);
vg->wait_in = g_unix_fd_add(vg->sock_fd, G_IO_IN | G_IO_HUP,
get_edid_cb, vg);
cmd->state = VG_CMD_STATE_PENDING;
}
static void
vg_resource_create_2d(VuGpu *g,
struct virtio_gpu_ctrl_command *cmd)
{
pixman_format_code_t pformat;
struct virtio_gpu_simple_resource *res;
struct virtio_gpu_resource_create_2d c2d;
VUGPU_FILL_CMD(c2d);
virtio_gpu_bswap_32(&c2d, sizeof(c2d));
if (c2d.resource_id == 0) {
g_critical("%s: resource id 0 is not allowed", __func__);
cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
return;
}
res = virtio_gpu_find_resource(g, c2d.resource_id);
if (res) {
g_critical("%s: resource already exists %d", __func__, c2d.resource_id);
cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
return;
}
res = g_new0(struct virtio_gpu_simple_resource, 1);
res->width = c2d.width;
res->height = c2d.height;
res->format = c2d.format;
res->resource_id = c2d.resource_id;
pformat = virtio_gpu_get_pixman_format(c2d.format);
if (!pformat) {
g_critical("%s: host couldn't handle guest format %d",
__func__, c2d.format);
g_free(res);
cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
return;
}
vugbm_buffer_create(&res->buffer, &g->gdev, c2d.width, c2d.height);
res->image = pixman_image_create_bits(pformat,
c2d.width,
c2d.height,
(uint32_t *)res->buffer.mmap,
res->buffer.stride);
if (!res->image) {
g_critical("%s: resource creation failed %d %d %d",
__func__, c2d.resource_id, c2d.width, c2d.height);
vugbm_buffer_destroy(&res->buffer);
g_free(res);
cmd->error = VIRTIO_GPU_RESP_ERR_OUT_OF_MEMORY;
return;
}
QTAILQ_INSERT_HEAD(&g->reslist, res, next);
}
static void
vg_disable_scanout(VuGpu *g, int scanout_id)
{
struct virtio_gpu_scanout *scanout = &g->scanout[scanout_id];
struct virtio_gpu_simple_resource *res;
if (scanout->resource_id == 0) {
return;
}
res = virtio_gpu_find_resource(g, scanout->resource_id);
if (res) {
res->scanout_bitmask &= ~(1 << scanout_id);
}
scanout->width = 0;
scanout->height = 0;
if (g->sock_fd >= 0) {
VhostUserGpuMsg msg = {
.request = VHOST_USER_GPU_SCANOUT,
.size = sizeof(VhostUserGpuScanout),
.payload.scanout.scanout_id = scanout_id,
};
vg_send_msg(g, &msg, -1);
}
}
static void
vg_resource_destroy(VuGpu *g,
struct virtio_gpu_simple_resource *res)
{
int i;
if (res->scanout_bitmask) {
for (i = 0; i < VIRTIO_GPU_MAX_SCANOUTS; i++) {
if (res->scanout_bitmask & (1 << i)) {
vg_disable_scanout(g, i);
}
}
}
vugbm_buffer_destroy(&res->buffer);
vg_cleanup_mapping(g, res);
pixman_image_unref(res->image);
QTAILQ_REMOVE(&g->reslist, res, next);
g_free(res);
}
static void
vg_resource_unref(VuGpu *g,
struct virtio_gpu_ctrl_command *cmd)
{
struct virtio_gpu_simple_resource *res;
struct virtio_gpu_resource_unref unref;
VUGPU_FILL_CMD(unref);
virtio_gpu_bswap_32(&unref, sizeof(unref));
res = virtio_gpu_find_resource(g, unref.resource_id);
if (!res) {
g_critical("%s: illegal resource specified %d",
__func__, unref.resource_id);
cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
return;
}
vg_resource_destroy(g, res);
}
int
vg_create_mapping_iov(VuGpu *g,
struct virtio_gpu_resource_attach_backing *ab,
struct virtio_gpu_ctrl_command *cmd,
struct iovec **iov)
{
struct virtio_gpu_mem_entry *ents;
size_t esize, s;
int i;
if (ab->nr_entries > 16384) {
g_critical("%s: nr_entries is too big (%d > 16384)",
__func__, ab->nr_entries);
return -1;
}
esize = sizeof(*ents) * ab->nr_entries;
ents = g_malloc(esize);
s = iov_to_buf(cmd->elem.out_sg, cmd->elem.out_num,
sizeof(*ab), ents, esize);
if (s != esize) {
g_critical("%s: command data size incorrect %zu vs %zu",
__func__, s, esize);
g_free(ents);
return -1;
}
*iov = g_new0(struct iovec, ab->nr_entries);
for (i = 0; i < ab->nr_entries; i++) {
uint64_t len = ents[i].length;
(*iov)[i].iov_len = ents[i].length;
(*iov)[i].iov_base = vu_gpa_to_va(&g->dev.parent, &len, ents[i].addr);
if (!(*iov)[i].iov_base || len != ents[i].length) {
g_critical("%s: resource %d element %d",
__func__, ab->resource_id, i);
g_free(*iov);
g_free(ents);
*iov = NULL;
return -1;
}
}
g_free(ents);
return 0;
}
static void
vg_resource_attach_backing(VuGpu *g,
struct virtio_gpu_ctrl_command *cmd)
{
struct virtio_gpu_simple_resource *res;
struct virtio_gpu_resource_attach_backing ab;
int ret;
VUGPU_FILL_CMD(ab);
virtio_gpu_bswap_32(&ab, sizeof(ab));
res = virtio_gpu_find_resource(g, ab.resource_id);
if (!res) {
g_critical("%s: illegal resource specified %d",
__func__, ab.resource_id);
cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
return;
}
if (res->iov) {
cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
return;
}
ret = vg_create_mapping_iov(g, &ab, cmd, &res->iov);
if (ret != 0) {
cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
return;
}
res->iov_cnt = ab.nr_entries;
}
/* Though currently only free iov, maybe later will do more work. */
void vg_cleanup_mapping_iov(VuGpu *g,
struct iovec *iov, uint32_t count)
{
g_free(iov);
}
static void
vg_cleanup_mapping(VuGpu *g,
struct virtio_gpu_simple_resource *res)
{
vg_cleanup_mapping_iov(g, res->iov, res->iov_cnt);
res->iov = NULL;
res->iov_cnt = 0;
}
static void
vg_resource_detach_backing(VuGpu *g,
struct virtio_gpu_ctrl_command *cmd)
{
struct virtio_gpu_simple_resource *res;
struct virtio_gpu_resource_detach_backing detach;
VUGPU_FILL_CMD(detach);
virtio_gpu_bswap_32(&detach, sizeof(detach));
res = virtio_gpu_find_resource(g, detach.resource_id);
if (!res || !res->iov) {
g_critical("%s: illegal resource specified %d",
__func__, detach.resource_id);
cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
return;
}
vg_cleanup_mapping(g, res);
}
static void
vg_transfer_to_host_2d(VuGpu *g,
struct virtio_gpu_ctrl_command *cmd)
{
struct virtio_gpu_simple_resource *res;
int h;
uint32_t src_offset, dst_offset, stride;
int bpp;
pixman_format_code_t format;
struct virtio_gpu_transfer_to_host_2d t2d;
VUGPU_FILL_CMD(t2d);
virtio_gpu_t2d_bswap(&t2d);
res = virtio_gpu_find_resource(g, t2d.resource_id);
if (!res || !res->iov) {
g_critical("%s: illegal resource specified %d",
__func__, t2d.resource_id);
cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
return;
}
if (t2d.r.x > res->width ||
t2d.r.y > res->height ||
t2d.r.width > res->width ||
t2d.r.height > res->height ||
t2d.r.x + t2d.r.width > res->width ||
t2d.r.y + t2d.r.height > res->height) {
g_critical("%s: transfer bounds outside resource"
" bounds for resource %d: %d %d %d %d vs %d %d",
__func__, t2d.resource_id, t2d.r.x, t2d.r.y,
t2d.r.width, t2d.r.height, res->width, res->height);
cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
return;
}
format = pixman_image_get_format(res->image);
bpp = (PIXMAN_FORMAT_BPP(format) + 7) / 8;
stride = pixman_image_get_stride(res->image);
if (t2d.offset || t2d.r.x || t2d.r.y ||
t2d.r.width != pixman_image_get_width(res->image)) {
void *img_data = pixman_image_get_data(res->image);
for (h = 0; h < t2d.r.height; h++) {
src_offset = t2d.offset + stride * h;
dst_offset = (t2d.r.y + h) * stride + (t2d.r.x * bpp);
iov_to_buf(res->iov, res->iov_cnt, src_offset,
img_data
+ dst_offset, t2d.r.width * bpp);
}
} else {
iov_to_buf(res->iov, res->iov_cnt, 0,
pixman_image_get_data(res->image),
pixman_image_get_stride(res->image)
* pixman_image_get_height(res->image));
}
}
static void
vg_set_scanout(VuGpu *g,
struct virtio_gpu_ctrl_command *cmd)
{
struct virtio_gpu_simple_resource *res, *ores;
struct virtio_gpu_scanout *scanout;
struct virtio_gpu_set_scanout ss;
int fd;
VUGPU_FILL_CMD(ss);
virtio_gpu_bswap_32(&ss, sizeof(ss));
if (ss.scanout_id >= VIRTIO_GPU_MAX_SCANOUTS) {
g_critical("%s: illegal scanout id specified %d",
__func__, ss.scanout_id);
cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_SCANOUT_ID;
return;
}
if (ss.resource_id == 0) {
vg_disable_scanout(g, ss.scanout_id);
return;
}
/* create a surface for this scanout */
res = virtio_gpu_find_resource(g, ss.resource_id);
if (!res) {
g_critical("%s: illegal resource specified %d",
__func__, ss.resource_id);
cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
return;
}
if (ss.r.x > res->width ||
ss.r.y > res->height ||
ss.r.width > res->width ||
ss.r.height > res->height ||
ss.r.x + ss.r.width > res->width ||
ss.r.y + ss.r.height > res->height) {
g_critical("%s: illegal scanout %d bounds for"
" resource %d, (%d,%d)+%d,%d vs %d %d",
__func__, ss.scanout_id, ss.resource_id, ss.r.x, ss.r.y,
ss.r.width, ss.r.height, res->width, res->height);
cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
return;
}
scanout = &g->scanout[ss.scanout_id];
ores = virtio_gpu_find_resource(g, scanout->resource_id);
if (ores) {
ores->scanout_bitmask &= ~(1 << ss.scanout_id);
}
res->scanout_bitmask |= (1 << ss.scanout_id);
scanout->resource_id = ss.resource_id;
scanout->x = ss.r.x;
scanout->y = ss.r.y;
scanout->width = ss.r.width;
scanout->height = ss.r.height;
struct vugbm_buffer *buffer = &res->buffer;
if (vugbm_buffer_can_get_dmabuf_fd(buffer)) {
VhostUserGpuMsg msg = {
.request = VHOST_USER_GPU_DMABUF_SCANOUT,
.size = sizeof(VhostUserGpuDMABUFScanout),
.payload.dmabuf_scanout = (VhostUserGpuDMABUFScanout) {
.scanout_id = ss.scanout_id,
.x = ss.r.x,
.y = ss.r.y,
.width = ss.r.width,
.height = ss.r.height,
.fd_width = buffer->width,
.fd_height = buffer->height,
.fd_stride = buffer->stride,
.fd_drm_fourcc = buffer->format
}
};
if (vugbm_buffer_get_dmabuf_fd(buffer, &fd)) {
vg_send_msg(g, &msg, fd);
close(fd);
}
} else {
VhostUserGpuMsg msg = {
.request = VHOST_USER_GPU_SCANOUT,
.size = sizeof(VhostUserGpuScanout),
.payload.scanout = (VhostUserGpuScanout) {
.scanout_id = ss.scanout_id,
.width = scanout->width,
.height = scanout->height
}
};
vg_send_msg(g, &msg, -1);
}
}
static void
vg_resource_flush(VuGpu *g,
struct virtio_gpu_ctrl_command *cmd)
{
struct virtio_gpu_simple_resource *res;
struct virtio_gpu_resource_flush rf;
pixman_region16_t flush_region;
int i;
VUGPU_FILL_CMD(rf);
virtio_gpu_bswap_32(&rf, sizeof(rf));
res = virtio_gpu_find_resource(g, rf.resource_id);
if (!res) {
g_critical("%s: illegal resource specified %d\n",
__func__, rf.resource_id);
cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
return;
}
if (rf.r.x > res->width ||
rf.r.y > res->height ||
rf.r.width > res->width ||
rf.r.height > res->height ||
rf.r.x + rf.r.width > res->width ||
rf.r.y + rf.r.height > res->height) {
g_critical("%s: flush bounds outside resource"
" bounds for resource %d: %d %d %d %d vs %d %d\n",
__func__, rf.resource_id, rf.r.x, rf.r.y,
rf.r.width, rf.r.height, res->width, res->height);
cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
return;
}
pixman_region_init_rect(&flush_region,
rf.r.x, rf.r.y, rf.r.width, rf.r.height);
for (i = 0; i < VIRTIO_GPU_MAX_SCANOUTS; i++) {
struct virtio_gpu_scanout *scanout;
pixman_region16_t region, finalregion;
pixman_box16_t *extents;
if (!(res->scanout_bitmask & (1 << i))) {
continue;
}
scanout = &g->scanout[i];
pixman_region_init(&finalregion);
pixman_region_init_rect(&region, scanout->x, scanout->y,
scanout->width, scanout->height);
pixman_region_intersect(&finalregion, &flush_region, &region);
extents = pixman_region_extents(&finalregion);
size_t width = extents->x2 - extents->x1;
size_t height = extents->y2 - extents->y1;
if (vugbm_buffer_can_get_dmabuf_fd(&res->buffer)) {
VhostUserGpuMsg vmsg = {
.request = VHOST_USER_GPU_DMABUF_UPDATE,
.size = sizeof(VhostUserGpuUpdate),
.payload.update = (VhostUserGpuUpdate) {
.scanout_id = i,
.x = extents->x1,
.y = extents->y1,
.width = width,
.height = height,
}
};
vg_send_msg(g, &vmsg, -1);
vg_wait_ok(g);
} else {
size_t bpp =
PIXMAN_FORMAT_BPP(pixman_image_get_format(res->image)) / 8;
size_t size = width * height * bpp;
void *p = g_malloc(VHOST_USER_GPU_HDR_SIZE +
sizeof(VhostUserGpuUpdate) + size);
VhostUserGpuMsg *msg = p;
msg->request = VHOST_USER_GPU_UPDATE;
msg->size = sizeof(VhostUserGpuUpdate) + size;
msg->payload.update = (VhostUserGpuUpdate) {
.scanout_id = i,
.x = extents->x1,
.y = extents->y1,
.width = width,
.height = height,
};
pixman_image_t *i =
pixman_image_create_bits(pixman_image_get_format(res->image),
msg->payload.update.width,
msg->payload.update.height,
p + offsetof(VhostUserGpuMsg,
payload.update.data),
width * bpp);
pixman_image_composite(PIXMAN_OP_SRC,
res->image, NULL, i,
extents->x1, extents->y1,
0, 0, 0, 0,
width, height);
pixman_image_unref(i);
vg_send_msg(g, msg, -1);
g_free(msg);
}
pixman_region_fini(&region);
pixman_region_fini(&finalregion);
}
pixman_region_fini(&flush_region);
}
static void
vg_process_cmd(VuGpu *vg, struct virtio_gpu_ctrl_command *cmd)
{
switch (cmd->cmd_hdr.type) {
case VIRTIO_GPU_CMD_GET_DISPLAY_INFO:
vg_get_display_info(vg, cmd);
break;
case VIRTIO_GPU_CMD_RESOURCE_CREATE_2D:
vg_resource_create_2d(vg, cmd);
break;
case VIRTIO_GPU_CMD_RESOURCE_UNREF:
vg_resource_unref(vg, cmd);
break;
case VIRTIO_GPU_CMD_RESOURCE_FLUSH:
vg_resource_flush(vg, cmd);
break;
case VIRTIO_GPU_CMD_TRANSFER_TO_HOST_2D:
vg_transfer_to_host_2d(vg, cmd);
break;
case VIRTIO_GPU_CMD_SET_SCANOUT:
vg_set_scanout(vg, cmd);
break;
case VIRTIO_GPU_CMD_RESOURCE_ATTACH_BACKING:
vg_resource_attach_backing(vg, cmd);
break;
case VIRTIO_GPU_CMD_RESOURCE_DETACH_BACKING:
vg_resource_detach_backing(vg, cmd);
break;
case VIRTIO_GPU_CMD_GET_EDID:
vg_get_edid(vg, cmd);
break;
default:
g_warning("TODO handle ctrl %x\n", cmd->cmd_hdr.type);
cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
break;
}
if (cmd->state == VG_CMD_STATE_NEW) {
vg_ctrl_response_nodata(vg, cmd, cmd->error ? cmd->error :
VIRTIO_GPU_RESP_OK_NODATA);
}
}
static void
vg_handle_ctrl(VuDev *dev, int qidx)
{
VuGpu *vg = container_of(dev, VuGpu, dev.parent);
VuVirtq *vq = vu_get_queue(dev, qidx);
struct virtio_gpu_ctrl_command *cmd = NULL;
size_t len;
for (;;) {
if (vg->wait_in != 0) {
return;
}
cmd = vu_queue_pop(dev, vq, sizeof(struct virtio_gpu_ctrl_command));
if (!cmd) {
break;
}
cmd->vq = vq;
cmd->error = 0;
cmd->state = VG_CMD_STATE_NEW;
len = iov_to_buf(cmd->elem.out_sg, cmd->elem.out_num,
0, &cmd->cmd_hdr, sizeof(cmd->cmd_hdr));
if (len != sizeof(cmd->cmd_hdr)) {
g_warning("%s: command size incorrect %zu vs %zu\n",
__func__, len, sizeof(cmd->cmd_hdr));
}
virtio_gpu_ctrl_hdr_bswap(&cmd->cmd_hdr);
g_debug("%d %s\n", cmd->cmd_hdr.type,
vg_cmd_to_string(cmd->cmd_hdr.type));
if (vg->virgl) {
vg_virgl_process_cmd(vg, cmd);
} else {
vg_process_cmd(vg, cmd);
}
if (cmd->state != VG_CMD_STATE_FINISHED) {
QTAILQ_INSERT_TAIL(&vg->fenceq, cmd, next);
vg->inflight++;
} else {
free(cmd);
}
}
}
static void
update_cursor_data_simple(VuGpu *g, uint32_t resource_id, gpointer data)
{
struct virtio_gpu_simple_resource *res;
res = virtio_gpu_find_resource(g, resource_id);
g_return_if_fail(res != NULL);
g_return_if_fail(pixman_image_get_width(res->image) == 64);
g_return_if_fail(pixman_image_get_height(res->image) == 64);
g_return_if_fail(
PIXMAN_FORMAT_BPP(pixman_image_get_format(res->image)) == 32);
memcpy(data, pixman_image_get_data(res->image), 64 * 64 * sizeof(uint32_t));
}
static void
vg_process_cursor_cmd(VuGpu *g, struct virtio_gpu_update_cursor *cursor)
{
switch (cursor->hdr.type) {
case VIRTIO_GPU_CMD_MOVE_CURSOR: {
VhostUserGpuMsg msg = {
.request = cursor->resource_id ?
VHOST_USER_GPU_CURSOR_POS : VHOST_USER_GPU_CURSOR_POS_HIDE,
.size = sizeof(VhostUserGpuCursorPos),
.payload.cursor_pos = {
.scanout_id = cursor->pos.scanout_id,
.x = cursor->pos.x,
.y = cursor->pos.y,
}
};
g_debug("%s: move", G_STRFUNC);
vg_send_msg(g, &msg, -1);
break;
}
case VIRTIO_GPU_CMD_UPDATE_CURSOR: {
VhostUserGpuMsg msg = {
.request = VHOST_USER_GPU_CURSOR_UPDATE,
.size = sizeof(VhostUserGpuCursorUpdate),
.payload.cursor_update = {
.pos = {
.scanout_id = cursor->pos.scanout_id,
.x = cursor->pos.x,
.y = cursor->pos.y,
},
.hot_x = cursor->hot_x,
.hot_y = cursor->hot_y,
}
};
g_debug("%s: update", G_STRFUNC);
if (g->virgl) {
vg_virgl_update_cursor_data(g, cursor->resource_id,
msg.payload.cursor_update.data);
} else {
update_cursor_data_simple(g, cursor->resource_id,
msg.payload.cursor_update.data);
}
vg_send_msg(g, &msg, -1);
break;
}
default:
g_debug("%s: unknown cmd %d", G_STRFUNC, cursor->hdr.type);
break;
}
}
static void
vg_handle_cursor(VuDev *dev, int qidx)
{
VuGpu *g = container_of(dev, VuGpu, dev.parent);
VuVirtq *vq = vu_get_queue(dev, qidx);
VuVirtqElement *elem;
size_t len;
struct virtio_gpu_update_cursor cursor;
for (;;) {
elem = vu_queue_pop(dev, vq, sizeof(VuVirtqElement));
if (!elem) {
break;
}
g_debug("cursor out:%d in:%d\n", elem->out_num, elem->in_num);
len = iov_to_buf(elem->out_sg, elem->out_num,
0, &cursor, sizeof(cursor));
if (len != sizeof(cursor)) {
g_warning("%s: cursor size incorrect %zu vs %zu\n",
__func__, len, sizeof(cursor));
} else {
virtio_gpu_bswap_32(&cursor, sizeof(cursor));
vg_process_cursor_cmd(g, &cursor);
}
vu_queue_push(dev, vq, elem, 0);
vu_queue_notify(dev, vq);
free(elem);
}
}
static void
vg_panic(VuDev *dev, const char *msg)
{
g_critical("%s\n", msg);
exit(1);
}
static void
vg_queue_set_started(VuDev *dev, int qidx, bool started)
{
VuVirtq *vq = vu_get_queue(dev, qidx);
g_debug("queue started %d:%d\n", qidx, started);
switch (qidx) {
case 0:
vu_set_queue_handler(dev, vq, started ? vg_handle_ctrl : NULL);
break;
case 1:
vu_set_queue_handler(dev, vq, started ? vg_handle_cursor : NULL);
break;
default:
break;
}
}
static gboolean
protocol_features_cb(gint fd, GIOCondition condition, gpointer user_data)
{
const uint64_t protocol_edid = (1 << VHOST_USER_GPU_PROTOCOL_F_EDID);
VuGpu *g = user_data;
uint64_t protocol_features;
VhostUserGpuMsg msg = {
.request = VHOST_USER_GPU_GET_PROTOCOL_FEATURES
};
if (!vg_recv_msg(g, msg.request,
sizeof(protocol_features), &protocol_features)) {
return G_SOURCE_CONTINUE;
}
protocol_features &= protocol_edid;
msg = (VhostUserGpuMsg) {
.request = VHOST_USER_GPU_SET_PROTOCOL_FEATURES,
.size = sizeof(uint64_t),
.payload.u64 = protocol_features,
};
vg_send_msg(g, &msg, -1);
g->wait_in = 0;
vg_handle_ctrl(&g->dev.parent, 0);
if (g->edid_inited && !(protocol_features & protocol_edid)) {
g_printerr("EDID feature set by the frontend but it does not support "
"the EDID vhost-user-gpu protocol.\n");
exit(EXIT_FAILURE);
}
return G_SOURCE_REMOVE;
}
static void
set_gpu_protocol_features(VuGpu *g)
{
VhostUserGpuMsg msg = {
.request = VHOST_USER_GPU_GET_PROTOCOL_FEATURES,
};
vg_send_msg(g, &msg, -1);
assert(g->wait_in == 0);
g->wait_in = g_unix_fd_add(g->sock_fd, G_IO_IN | G_IO_HUP,
protocol_features_cb, g);
}
static int
vg_process_msg(VuDev *dev, VhostUserMsg *msg, int *do_reply)
{
VuGpu *g = container_of(dev, VuGpu, dev.parent);
switch (msg->request) {
case VHOST_USER_GPU_SET_SOCKET: {
g_return_val_if_fail(msg->fd_num == 1, 1);
g_return_val_if_fail(g->sock_fd == -1, 1);
g->sock_fd = msg->fds[0];
set_gpu_protocol_features(g);
return 1;
}
default:
return 0;
}
return 0;
}
static uint64_t
vg_get_features(VuDev *dev)
{
uint64_t features = 0;
if (opt_virgl) {
features |= 1 << VIRTIO_GPU_F_VIRGL;
}
features |= 1 << VIRTIO_GPU_F_EDID;
return features;
}
static void
vg_set_features(VuDev *dev, uint64_t features)
{
VuGpu *g = container_of(dev, VuGpu, dev.parent);
bool virgl = features & (1 << VIRTIO_GPU_F_VIRGL);
if (virgl && !g->virgl_inited) {
if (!vg_virgl_init(g)) {
vg_panic(dev, "Failed to initialize virgl");
}
g->virgl_inited = true;
}
g->edid_inited = !!(features & (1 << VIRTIO_GPU_F_EDID));
g->virgl = virgl;
}
static int
vg_get_config(VuDev *dev, uint8_t *config, uint32_t len)
{
VuGpu *g = container_of(dev, VuGpu, dev.parent);
if (len > sizeof(struct virtio_gpu_config)) {
return -1;
}
if (opt_virgl) {
g->virtio_config.num_capsets = vg_virgl_get_num_capsets();
}
memcpy(config, &g->virtio_config, len);
return 0;
}
static int
vg_set_config(VuDev *dev, const uint8_t *data,
uint32_t offset, uint32_t size,
uint32_t flags)
{
VuGpu *g = container_of(dev, VuGpu, dev.parent);
struct virtio_gpu_config *config = (struct virtio_gpu_config *)data;
if (config->events_clear) {
g->virtio_config.events_read &= ~config->events_clear;
}
return 0;
}
static const VuDevIface vuiface = {
.set_features = vg_set_features,
.get_features = vg_get_features,
.queue_set_started = vg_queue_set_started,
.process_msg = vg_process_msg,
.get_config = vg_get_config,
.set_config = vg_set_config,
};
static void
vg_destroy(VuGpu *g)
{
struct virtio_gpu_simple_resource *res, *tmp;
vug_deinit(&g->dev);
vg_sock_fd_close(g);
QTAILQ_FOREACH_SAFE(res, &g->reslist, next, tmp) {
vg_resource_destroy(g, res);
}
vugbm_device_destroy(&g->gdev);
}
static GOptionEntry entries[] = {
{ "print-capabilities", 'c', 0, G_OPTION_ARG_NONE, &opt_print_caps,
"Print capabilities", NULL },
{ "fd", 'f', 0, G_OPTION_ARG_INT, &opt_fdnum,
"Use inherited fd socket", "FDNUM" },
{ "socket-path", 's', 0, G_OPTION_ARG_FILENAME, &opt_socket_path,
"Use UNIX socket path", "PATH" },
{ "render-node", 'r', 0, G_OPTION_ARG_FILENAME, &opt_render_node,
"Specify DRM render node", "PATH" },
{ "virgl", 'v', 0, G_OPTION_ARG_NONE, &opt_virgl,
"Turn virgl rendering on", NULL },
{ NULL, }
};
int
main(int argc, char *argv[])
{
GOptionContext *context;
GError *error = NULL;
GMainLoop *loop = NULL;
int fd;
VuGpu g = { .sock_fd = -1, .drm_rnode_fd = -1 };
QTAILQ_INIT(&g.reslist);
QTAILQ_INIT(&g.fenceq);
context = g_option_context_new("QEMU vhost-user-gpu");
g_option_context_add_main_entries(context, entries, NULL);
if (!g_option_context_parse(context, &argc, &argv, &error)) {
g_printerr("Option parsing failed: %s\n", error->message);
exit(EXIT_FAILURE);
}
g_option_context_free(context);
if (opt_print_caps) {
g_print("{\n");
g_print(" \"type\": \"gpu\",\n");
g_print(" \"features\": [\n");
g_print(" \"render-node\",\n");
g_print(" \"virgl\"\n");
g_print(" ]\n");
g_print("}\n");
exit(EXIT_SUCCESS);
}
g.drm_rnode_fd = qemu_drm_rendernode_open(opt_render_node);
if (opt_render_node && g.drm_rnode_fd == -1) {
g_printerr("Failed to open DRM rendernode.\n");
exit(EXIT_FAILURE);
}
vugbm_device_init(&g.gdev, g.drm_rnode_fd);
if ((!!opt_socket_path + (opt_fdnum != -1)) != 1) {
g_printerr("Please specify either --fd or --socket-path\n");
exit(EXIT_FAILURE);
}
if (opt_socket_path) {
int lsock = unix_listen(opt_socket_path, &error_fatal);
if (lsock < 0) {
g_printerr("Failed to listen on %s.\n", opt_socket_path);
exit(EXIT_FAILURE);
}
fd = accept(lsock, NULL, NULL);
close(lsock);
} else {
fd = opt_fdnum;
}
if (fd == -1) {
g_printerr("Invalid vhost-user socket.\n");
exit(EXIT_FAILURE);
}
if (!vug_init(&g.dev, VHOST_USER_GPU_MAX_QUEUES, fd, vg_panic, &vuiface)) {
g_printerr("Failed to initialize libvhost-user-glib.\n");
exit(EXIT_FAILURE);
}
loop = g_main_loop_new(NULL, FALSE);
g_main_loop_run(loop);
g_main_loop_unref(loop);
vg_destroy(&g);
if (g.drm_rnode_fd >= 0) {
close(g.drm_rnode_fd);
}
return 0;
}
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