github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-30 01:53:29 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

drm/vkms: Allow to configure CRTC writeback support via configfs

Browse Source 
When a CRTC is created, add a `writeback` file to allow to enable or
disable writeback connector support

Tested-by: Mark Yacoub <markyacoub@google.com>
Reviewed-by: Louis Chauvet <louis.chauvet@bootlin.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
Co-developed-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Link: https://lore.kernel.org/r/20251016175618.10051-7-jose.exposito89@gmail.com
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
This commit is contained in:
Louis Chauvet 2025-10-16 19:56:08 +02:00 committed by Luca Ceresoli
parent 3e4d5b30d2
commit ee5c2c7d4b
2 changed files with 46 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/gpu/vkms.rst
View File

@ -94,6 +94,10 @@ Continue by creating one or more CRTCs::
sudo mkdir /config/vkms/my-vkms/crtcs/crtc0
CRTCs have 1 configurable attribute:
- writeback: Enable or disable writeback connector support by writing 1 or 0
Once you are done configuring the VKMS instance, enable it::
echo "1" | sudo tee /config/vkms/my-vkms/enabled

42
drivers/gpu/drm/vkms/vkms_configfs.c
View File

@ -74,6 +74,47 @@ struct vkms_configfs_crtc {
#define crtc_item_to_vkms_configfs_crtc(item) \
container_of(to_config_group((item)), struct vkms_configfs_crtc, group)
static ssize_t crtc_writeback_show(struct config_item *item, char *page)
{
struct vkms_configfs_crtc *crtc;
bool writeback;
crtc = crtc_item_to_vkms_configfs_crtc(item);
scoped_guard(mutex, &crtc->dev->lock)
writeback = vkms_config_crtc_get_writeback(crtc->config);
return sprintf(page, "%d\n", writeback);
}
static ssize_t crtc_writeback_store(struct config_item *item, const char *page,
size_t count)
{
struct vkms_configfs_crtc *crtc;
bool writeback;
crtc = crtc_item_to_vkms_configfs_crtc(item);
if (kstrtobool(page, &writeback))
return -EINVAL;
scoped_guard(mutex, &crtc->dev->lock) {
if (crtc->dev->enabled)
return -EBUSY;
vkms_config_crtc_set_writeback(crtc->config, writeback);
}
return (ssize_t)count;
}
CONFIGFS_ATTR(crtc_, writeback);
static struct configfs_attribute *crtc_item_attrs[] = {
&crtc_attr_writeback,
NULL,
};
static void crtc_release(struct config_item *item)
{
struct vkms_configfs_crtc *crtc;
@ -93,6 +134,7 @@ static struct configfs_item_operations crtc_item_operations = {
};
static const struct config_item_type crtc_item_type = {
.ct_attrs = crtc_item_attrs,
.ct_item_ops = &crtc_item_operations,
.ct_owner = THIS_MODULE,
};