From: Helen Koike <helen.koike@collabora.com>
To: Brandon Pollack <brpol@chromium.org>,
marius.vlad@collabora.com, mairacanal@riseup.net,
jshargo@chromium.org
Cc: hamohammed.sa@gmail.com, rodrigosiqueiramelo@gmail.com,
linux-doc@vger.kernel.org, hirono@chromium.org, corbet@lwn.net,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
melissa.srw@gmail.com, mduggan@chromium.org, mripard@kernel.org,
tzimmermann@suse.de
Subject: Re: [PATCH v6 7/7] drm/vkms Add hotplug support via configfs to VKMS.
Date: Wed, 20 Sep 2023 15:03:05 -0300 [thread overview]
Message-ID: <393d65d0-8886-6663-5521-ba495d711750@collabora.com> (raw)
In-Reply-To: <20230829053201.423261-8-brpol@chromium.org>
Hello!
Thanks for the patch.
On 29/08/2023 02:30, Brandon Pollack wrote:
> This change adds the ability to read or write a "1" or a "0" to the
> newly added "connected" attribute of a connector in the vkms entry in
> configfs.
>
> A write will trigger a call to drm_kms_helper_hotplug_event, causing a
> hotplug uevent.
>
> With this we can write virtualized multidisplay tests that involve
> hotplugging displays (eg recompositing windows when a monitor is turned
> off).
Are these tests going to be added in igt?
I was just wondering if it requires any special thing for drm ci:
https://lists.freedesktop.org/archives/dri-devel/2023-September/423719.html
(btw, it would be awesome of you could test your changes with drm ci :)
Regards,
Helen
>
> Signed-off-by: Brandon Pollack <brpol@chromium.org>
> ---
> Documentation/gpu/vkms.rst | 2 +-
> drivers/gpu/drm/vkms/vkms_configfs.c | 68 ++++++++++++++++++++++++++--
> drivers/gpu/drm/vkms/vkms_drv.h | 11 +++++
> drivers/gpu/drm/vkms/vkms_output.c | 47 ++++++++++++++++++-
> 4 files changed, 123 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/gpu/vkms.rst b/Documentation/gpu/vkms.rst
> index c3875bf66dba..7f715097539c 100644
> --- a/Documentation/gpu/vkms.rst
> +++ b/Documentation/gpu/vkms.rst
> @@ -145,7 +145,7 @@ We want to be able to manipulate vkms instances without having to reload the
> module. Such configuration can be added as extensions to vkms's ConfigFS
> support. Use-cases:
>
> -- Hotplug/hotremove connectors on the fly (to be able to test DP MST handling
> +- Hotremove connectors on the fly (to be able to test DP MST handling
> of compositors).
>
> - Change output configuration: Plug/unplug screens, change EDID, allow changing
> diff --git a/drivers/gpu/drm/vkms/vkms_configfs.c b/drivers/gpu/drm/vkms/vkms_configfs.c
> index bc35dcc47585..d231e28101ae 100644
> --- a/drivers/gpu/drm/vkms/vkms_configfs.c
> +++ b/drivers/gpu/drm/vkms/vkms_configfs.c
> @@ -1,5 +1,6 @@
> // SPDX-License-Identifier: GPL-2.0+
>
> +#include "drm/drm_probe_helper.h"
> #include <linux/configfs.h>
> #include <linux/mutex.h>
> #include <linux/platform_device.h>
> @@ -40,6 +41,7 @@
> * `-- vkms
> * `-- test
> * |-- connectors
> + * `-- connected
> * |-- crtcs
> * |-- encoders
> * |-- planes
> @@ -89,6 +91,14 @@
> *
> * echo 1 > /config/vkms/test/enabled
> *
> + * By default no display is "connected" so to connect a connector you'll also
> + * have to write 1 to a connectors "connected" attribute::
> + *
> + * echo 1 > /config/vkms/test/connectors/connector/connected
> + *
> + * One can verify that this is worked using the `modetest` utility or the
> + * equivalent for your platform.
> + *
> * When you're done with the virtual device, you can clean up the device like
> * so::
> *
> @@ -236,7 +246,58 @@ static void add_possible_encoders(struct config_group *parent,
>
> /* Connector item, e.g. /config/vkms/device/connectors/ID */
>
> +static ssize_t connector_connected_show(struct config_item *item, char *buf)
> +{
> + struct vkms_config_connector *connector =
> + item_to_config_connector(item);
> + struct vkms_configfs *configfs = connector_item_to_configfs(item);
> + bool connected = false;
> +
> + mutex_lock(&configfs->lock);
> + connected = connector->connected;
> + mutex_unlock(&configfs->lock);
> +
> + return sprintf(buf, "%d\n", connected);
> +}
> +
> +static ssize_t connector_connected_store(struct config_item *item,
> + const char *buf, size_t len)
> +{
> + struct vkms_config_connector *connector =
> + item_to_config_connector(item);
> + struct vkms_configfs *configfs = connector_item_to_configfs(item);
> + int val, ret;
> +
> + ret = kstrtouint(buf, 10, &val);
> + if (ret)
> + return ret;
> +
> + if (val != 1 && val != 0)
> + return -EINVAL;
> +
> + mutex_lock(&configfs->lock);
> + connector->connected = val;
> + if (!connector->connector) {
> + pr_info("VKMS Device %s is not yet enabled, connector will be enabled on start",
> + configfs->device_group.cg_item.ci_name);
> + }
> + mutex_unlock(&configfs->lock);
> +
> + if (connector->connector)
> + drm_kms_helper_hotplug_event(connector->connector->dev);
> +
> + return len;
> +}
> +
> +CONFIGFS_ATTR(connector_, connected);
> +
> +static struct configfs_attribute *connector_attrs[] = {
> + &connector_attr_connected,
> + NULL,
> +};
> +
> static struct config_item_type connector_type = {
> + .ct_attrs = connector_attrs,
> .ct_owner = THIS_MODULE,
> };
>
> @@ -264,7 +325,7 @@ static ssize_t plane_type_show(struct config_item *item, char *buf)
> plane_type = plane->type;
> mutex_unlock(&configfs->lock);
>
> - return sprintf(buf, "%u", plane_type);
> + return sprintf(buf, "%u\n", plane_type);
> }
>
> static ssize_t plane_type_store(struct config_item *item, const char *buf,
> @@ -319,6 +380,7 @@ static struct config_group *connectors_group_make(struct config_group *group,
> &connector_type);
> add_possible_encoders(&connector->config_group,
> &connector->possible_encoders.group);
> + connector->connected = false;
>
> return &connector->config_group;
> }
> @@ -500,7 +562,7 @@ static ssize_t device_enabled_show(struct config_item *item, char *buf)
> is_enabled = configfs->vkms_device != NULL;
> mutex_unlock(&configfs->lock);
>
> - return sprintf(buf, "%d", is_enabled);
> + return sprintf(buf, "%d\n", is_enabled);
> }
>
> static ssize_t device_enabled_store(struct config_item *item, const char *buf,
> @@ -557,7 +619,7 @@ static ssize_t device_id_show(struct config_item *item, char *buf)
>
> mutex_unlock(&configfs->lock);
>
> - return sprintf(buf, "%d", id);
> + return sprintf(buf, "%d\n", id);
> }
>
> CONFIGFS_ATTR_RO(device_, id);
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
> index 2b9545ada9c2..5336281f397e 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.h
> +++ b/drivers/gpu/drm/vkms/vkms_drv.h
> @@ -3,6 +3,7 @@
> #ifndef _VKMS_DRV_H_
> #define _VKMS_DRV_H_
>
> +#include "drm/drm_connector.h"
> #include <linux/configfs.h>
> #include <linux/hrtimer.h>
>
> @@ -147,7 +148,9 @@ struct vkms_config_links {
>
> struct vkms_config_connector {
> struct config_group config_group;
> + struct drm_connector *connector;
> struct vkms_config_links possible_encoders;
> + bool connected;
> };
>
> struct vkms_config_crtc {
> @@ -220,6 +223,10 @@ struct vkms_device {
> #define item_to_configfs(item) \
> container_of(to_config_group(item), struct vkms_configfs, device_group)
>
> +#define connector_item_to_configfs(item) \
> + container_of(to_config_group(item->ci_parent), struct vkms_configfs, \
> + connectors_group)
> +
> #define item_to_config_connector(item) \
> container_of(to_config_group(item), struct vkms_config_connector, \
> config_group)
> @@ -279,4 +286,8 @@ int vkms_enable_writeback_connector(struct vkms_device *vkmsdev,
> int vkms_init_configfs(void);
> void vkms_unregister_configfs(void);
>
> +/* Connector hotplugging */
> +enum drm_connector_status vkms_connector_detect(struct drm_connector *connector,
> + bool force);
> +
> #endif /* _VKMS_DRV_H_ */
> diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
> index 0ee1f3f4a305..1a1cd0202c5f 100644
> --- a/drivers/gpu/drm/vkms/vkms_output.c
> +++ b/drivers/gpu/drm/vkms/vkms_output.c
> @@ -1,5 +1,6 @@
> // SPDX-License-Identifier: GPL-2.0+
>
> +#include <drm/drm_print.h>
> #include <drm/drm_atomic_helper.h>
> #include <drm/drm_connector.h>
> #include <drm/drm_crtc.h>
> @@ -8,10 +9,12 @@
> #include <drm/drm_plane.h>
> #include <drm/drm_probe_helper.h>
> #include <drm/drm_simple_kms_helper.h>
> +#include <linux/printk.h>
>
> #include "vkms_drv.h"
>
> static const struct drm_connector_funcs vkms_connector_funcs = {
> + .detect = vkms_connector_detect,
> .fill_modes = drm_helper_probe_single_connector_modes,
> .destroy = drm_connector_cleanup,
> .reset = drm_atomic_helper_connector_reset,
> @@ -19,6 +22,48 @@ static const struct drm_connector_funcs vkms_connector_funcs = {
> .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> };
>
> +static const struct vkms_config_connector *
> +find_config_for_connector(struct drm_connector *connector)
> +{
> + struct vkms_device *vkms = drm_device_to_vkms_device(connector->dev);
> + struct vkms_configfs *configfs = vkms->configfs;
> + struct config_item *item;
> +
> + if (!configfs) {
> + pr_info("Default connector has no configfs entry");
> + return NULL;
> + }
> +
> + list_for_each_entry(item, &configfs->connectors_group.cg_children,
> + ci_entry) {
> + struct vkms_config_connector *config_connector =
> + item_to_config_connector(item);
> + if (config_connector->connector == connector)
> + return config_connector;
> + }
> +
> + pr_warn("Could not find config to match connector %s, but configfs was initialized",
> + connector->name);
> +
> + return NULL;
> +}
> +
> +enum drm_connector_status vkms_connector_detect(struct drm_connector *connector,
> + bool force)
> +{
> + enum drm_connector_status status = connector_status_connected;
> + const struct vkms_config_connector *config_connector =
> + find_config_for_connector(connector);
> +
> + if (!config_connector)
> + return connector_status_connected;
> +
> + if (!config_connector->connected)
> + status = connector_status_disconnected;
> +
> + return status;
> +}
> +
> static const struct drm_encoder_funcs vkms_encoder_funcs = {
> .destroy = drm_encoder_cleanup,
> };
> @@ -280,12 +325,12 @@ int vkms_output_init(struct vkms_device *vkmsdev)
> struct vkms_config_connector *config_connector =
> item_to_config_connector(item);
> struct drm_connector *connector = vkms_connector_init(vkmsdev);
> -
> if (IS_ERR(connector)) {
> DRM_ERROR("Failed to init connector from config: %s",
> item->ci_name);
> return PTR_ERR(connector);
> }
> + config_connector->connector = connector;
>
> for (int j = 0; j < output->num_encoders; j++) {
> struct encoder_map *encoder = &encoder_map[j];
next prev parent reply other threads:[~2023-09-20 18:03 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-29 5:30 [PATCH v6 0/7] Adds support for ConfigFS to VKMS! Brandon Pollack
2023-08-29 5:30 ` [PATCH v6 1/7] drm/vkms: Back VKMS with DRM memory management instead of static objects Brandon Pollack
2024-04-30 7:47 ` Daniel Vetter
2023-08-29 5:30 ` [PATCH v6 2/7] drm/vkms: Support multiple DRM objects (crtcs, etc.) per VKMS device Brandon Pollack
2023-09-01 9:33 ` Marius Vlad
2024-04-30 7:53 ` Daniel Vetter
2023-08-29 5:30 ` [PATCH v6 3/7] drm/vkms: Provide platform data when creating VKMS devices Brandon Pollack
2024-04-30 7:53 ` Daniel Vetter
2023-08-29 5:30 ` [PATCH v6 4/7] drm/vkms: Add ConfigFS scaffolding to VKMS Brandon Pollack
2024-04-30 8:14 ` Daniel Vetter
2023-08-29 5:30 ` [PATCH v6 5/7] drm/vkms: Support enabling ConfigFS devices Brandon Pollack
2024-04-30 8:22 ` Daniel Vetter
2024-04-30 8:32 ` Daniel Vetter
2023-08-29 5:30 ` [PATCH v6 6/7] drm/vkms: Add a module param to enable/disable the default device Brandon Pollack
2023-08-29 5:30 ` [PATCH v6 7/7] drm/vkms Add hotplug support via configfs to VKMS Brandon Pollack
2023-09-20 18:03 ` Helen Koike [this message]
2023-09-21 3:44 ` Brandon Ross Pollack
2024-04-30 8:27 ` Daniel Vetter
2023-09-01 9:32 ` [PATCH v6 0/7] Adds support for ConfigFS to VKMS! Marius Vlad
2024-04-30 8:36 ` Daniel Vetter
2024-05-08 18:17 ` José Expósito
2024-05-09 22:18 ` Jim Shargo
2024-05-10 16:19 ` Louis Chauvet
2024-05-13 8:08 ` José Expósito
2024-05-13 9:03 ` Marius Vlad
2024-05-13 16:23 ` José Expósito
2024-05-17 16:00 ` Louis Chauvet
2024-05-21 12:25 ` Daniel Vetter
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