78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR MIT
|
|
|
|
/*
|
|
* Xen para-virtual DRM device
|
|
*
|
|
* Copyright (C) 2016-2018 EPAM Systems Inc.
|
|
*
|
|
* Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
|
|
*/
|
|
|
|
#include <drm/drmP.h>
|
|
|
|
#include <linux/device.h>
|
|
|
|
#include <xen/interface/io/displif.h>
|
|
#include <xen/xenbus.h>
|
|
|
|
#include "xen_drm_front.h"
|
|
#include "xen_drm_front_cfg.h"
|
|
|
|
static int cfg_connector(struct xen_drm_front_info *front_info,
|
|
struct xen_drm_front_cfg_connector *connector,
|
|
const char *path, int index)
|
|
{
|
|
char *connector_path;
|
|
|
|
connector_path = devm_kasprintf(&front_info->xb_dev->dev,
|
|
GFP_KERNEL, "%s/%d", path, index);
|
|
if (!connector_path)
|
|
return -ENOMEM;
|
|
|
|
if (xenbus_scanf(XBT_NIL, connector_path, XENDISPL_FIELD_RESOLUTION,
|
|
"%d" XENDISPL_RESOLUTION_SEPARATOR "%d",
|
|
&connector->width, &connector->height) < 0) {
|
|
/* either no entry configured or wrong resolution set */
|
|
connector->width = 0;
|
|
connector->height = 0;
|
|
return -EINVAL;
|
|
}
|
|
|
|
connector->xenstore_path = connector_path;
|
|
|
|
DRM_INFO("Connector %s: resolution %dx%d\n",
|
|
connector_path, connector->width, connector->height);
|
|
return 0;
|
|
}
|
|
|
|
int xen_drm_front_cfg_card(struct xen_drm_front_info *front_info,
|
|
struct xen_drm_front_cfg *cfg)
|
|
{
|
|
struct xenbus_device *xb_dev = front_info->xb_dev;
|
|
int ret, i;
|
|
|
|
if (xenbus_read_unsigned(front_info->xb_dev->nodename,
|
|
XENDISPL_FIELD_BE_ALLOC, 0)) {
|
|
DRM_INFO("Backend can provide display buffers\n");
|
|
cfg->be_alloc = true;
|
|
}
|
|
|
|
cfg->num_connectors = 0;
|
|
for (i = 0; i < ARRAY_SIZE(cfg->connectors); i++) {
|
|
ret = cfg_connector(front_info, &cfg->connectors[i],
|
|
xb_dev->nodename, i);
|
|
if (ret < 0)
|
|
break;
|
|
cfg->num_connectors++;
|
|
}
|
|
|
|
if (!cfg->num_connectors) {
|
|
DRM_ERROR("No connector(s) configured at %s\n",
|
|
xb_dev->nodename);
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|