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Revert "drm/atomic_helper: Stop modesets on unregistered connectors harder"

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This reverts commit 72289dc23c which is
commit de9f8eea5a upstream.

It breaks the current drm abi and for Android devices, should not be an
issue as modesetting isn't a big deal for them.

Bug: 161946584
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I74a8e98a755dcd68a79a9fe6c50d92806cb7a1f2
This commit is contained in:
Greg Kroah-Hartman 2020-12-03 14:42:23 +01:00
parent 08bed51f55
commit 1309a09163
5 changed files with 33 additions and 99 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/gpu/drm/drm_atomic.c
View File

@ -1706,6 +1706,27 @@ drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
struct drm_connector *connector = conn_state->connector;
struct drm_crtc_state *crtc_state;
/*
* For compatibility with legacy users, we want to make sure that
* we allow DPMS On<->Off modesets on unregistered connectors, since
* legacy modesetting users will not be expecting these to fail. We do
* not however, want to allow legacy users to assign a connector
* that's been unregistered from sysfs to another CRTC, since doing
* this with a now non-existent connector could potentially leave us
* in an invalid state.
*
* Since the connector can be unregistered at any point during an
* atomic check or commit, this is racy. But that's OK: all we care
* about is ensuring that userspace can't use this connector for new
* configurations after it's been notified that the connector is no
* longer present.
*/
if (!READ_ONCE(connector->registered) && crtc) {
DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] is not registered\n",
connector->base.id, connector->name);
return -EINVAL;
}
if (conn_state->crtc == crtc)
return 0;

21
drivers/gpu/drm/drm_atomic_helper.c
View File

@ -307,26 +307,6 @@ update_connector_routing(struct drm_atomic_state *state,
return 0;
}
crtc_state = drm_atomic_get_new_crtc_state(state,
new_connector_state->crtc);
/*
* For compatibility with legacy users, we want to make sure that
* we allow DPMS On->Off modesets on unregistered connectors. Modesets
* which would result in anything else must be considered invalid, to
* avoid turning on new displays on dead connectors.
*
* Since the connector can be unregistered at any point during an
* atomic check or commit, this is racy. But that's OK: all we care
* about is ensuring that userspace can't do anything but shut off the
* display on a connector that was destroyed after its been notified,
* not before.
*/
if (drm_connector_is_unregistered(connector) && crtc_state->active) {
DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] is not registered\n",
connector->base.id, connector->name);
return -EINVAL;
}
funcs = connector->helper_private;
if (funcs->atomic_best_encoder)
@ -371,6 +351,7 @@ update_connector_routing(struct drm_atomic_state *state,
set_best_encoder(state, new_connector_state, new_encoder);
crtc_state = drm_atomic_get_new_crtc_state(state, new_connector_state->crtc);
crtc_state->connectors_changed = true;
DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] using [ENCODER:%d:%s] on [CRTC:%d:%s]\n",

11
drivers/gpu/drm/drm_connector.c
View File

@ -391,8 +391,7 @@ void drm_connector_cleanup(struct drm_connector *connector)
/* The connector should have been removed from userspace long before
* it is finally destroyed.
*/
if (WARN_ON(connector->registration_state ==
DRM_CONNECTOR_REGISTERED))
if (WARN_ON(connector->registered))
drm_connector_unregister(connector);
if (connector->tile_group) {
@ -449,7 +448,7 @@ int drm_connector_register(struct drm_connector *connector)
return 0;
mutex_lock(&connector->mutex);
if (connector->registration_state != DRM_CONNECTOR_INITIALIZING)
if (connector->registered)
goto unlock;
ret = drm_sysfs_connector_add(connector);
@ -469,7 +468,7 @@ int drm_connector_register(struct drm_connector *connector)
drm_mode_object_register(connector->dev, &connector->base);
connector->registration_state = DRM_CONNECTOR_REGISTERED;
connector->registered = true;
goto unlock;
err_debugfs:
@ -491,7 +490,7 @@ EXPORT_SYMBOL(drm_connector_register);
void drm_connector_unregister(struct drm_connector *connector)
{
mutex_lock(&connector->mutex);
if (connector->registration_state != DRM_CONNECTOR_REGISTERED) {
if (!connector->registered) {
mutex_unlock(&connector->mutex);
return;
}
@ -502,7 +501,7 @@ void drm_connector_unregister(struct drm_connector *connector)
drm_sysfs_connector_remove(connector);
drm_debugfs_connector_remove(connector);
connector->registration_state = DRM_CONNECTOR_UNREGISTERED;
connector->registered = false;
mutex_unlock(&connector->mutex);
}
EXPORT_SYMBOL(drm_connector_unregister);

8
drivers/gpu/drm/i915/intel_dp_mst.c
View File

@ -77,7 +77,7 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
pipe_config->pbn = mst_pbn;
/* Zombie connectors can't have VCPI slots */
if (!drm_connector_is_unregistered(connector)) {
if (READ_ONCE(connector->registered)) {
slots = drm_dp_atomic_find_vcpi_slots(state,
&intel_dp->mst_mgr,
port,
@ -317,7 +317,7 @@ static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
struct edid *edid;
int ret;
if (drm_connector_is_unregistered(connector))
if (!READ_ONCE(connector->registered))
return intel_connector_update_modes(connector, NULL);
edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
@ -333,7 +333,7 @@ intel_dp_mst_detect(struct drm_connector *connector, bool force)
struct intel_connector *intel_connector = to_intel_connector(connector);
struct intel_dp *intel_dp = intel_connector->mst_port;
if (drm_connector_is_unregistered(connector))
if (!READ_ONCE(connector->registered))
return connector_status_disconnected;
return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr,
intel_connector->port);
@ -376,7 +376,7 @@ intel_dp_mst_mode_valid(struct drm_connector *connector,
int bpp = 24; /* MST uses fixed bpp */
int max_rate, mode_rate, max_lanes, max_link_clock;
if (drm_connector_is_unregistered(connector))
if (!READ_ONCE(connector->registered))
return MODE_ERROR;
if (mode->flags & DRM_MODE_FLAG_DBLSCAN)

71
include/drm/drm_connector.h
View File

@ -82,53 +82,6 @@ enum drm_connector_status {
connector_status_unknown = 3,
};
/**
* enum drm_connector_registration_status - userspace registration status for
* a &drm_connector
*
* This enum is used to track the status of initializing a connector and
* registering it with userspace, so that DRM can prevent bogus modesets on
* connectors that no longer exist.
*/
enum drm_connector_registration_state {
/**
* @DRM_CONNECTOR_INITIALIZING: The connector has just been created,
* but has yet to be exposed to userspace. There should be no
* additional restrictions to how the state of this connector may be
* modified.
*/
DRM_CONNECTOR_INITIALIZING = 0,
/**
* @DRM_CONNECTOR_REGISTERED: The connector has been fully initialized
* and registered with sysfs, as such it has been exposed to
* userspace. There should be no additional restrictions to how the
* state of this connector may be modified.
*/
DRM_CONNECTOR_REGISTERED = 1,
/**
* @DRM_CONNECTOR_UNREGISTERED: The connector has either been exposed
* to userspace and has since been unregistered and removed from
* userspace, or the connector was unregistered before it had a chance
* to be exposed to userspace (e.g. still in the
* @DRM_CONNECTOR_INITIALIZING state). When a connector is
* unregistered, there are additional restrictions to how its state
* may be modified:
*
* - An unregistered connector may only have its DPMS changed from
* On->Off. Once DPMS is changed to Off, it may not be switched back
* to On.
* - Modesets are not allowed on unregistered connectors, unless they
* would result in disabling its assigned CRTCs. This means
* disabling a CRTC on an unregistered connector is OK, but enabling
* one is not.
* - Removing a CRTC from an unregistered connector is OK, but new
* CRTCs may never be assigned to an unregistered connector.
*/
DRM_CONNECTOR_UNREGISTERED = 2,
};
enum subpixel_order {
SubPixelUnknown = 0,
SubPixelHorizontalRGB,
@ -941,12 +894,10 @@ struct drm_connector {
bool ycbcr_420_allowed;
/**
* @registration_state: Is this connector initializing, exposed
* (registered) with userspace, or unregistered?
*
* @registered: Is this connector exposed (registered) with userspace?
* Protected by @mutex.
*/
enum drm_connector_registration_state registration_state;
bool registered;
/**
* @modes:
@ -1325,24 +1276,6 @@ static inline void drm_connector_unreference(struct drm_connector *connector)
drm_connector_put(connector);
}
/**
* drm_connector_is_unregistered - has the connector been unregistered from
* userspace?
* @connector: DRM connector
*
* Checks whether or not @connector has been unregistered from userspace.
*
* Returns:
* True if the connector was unregistered, false if the connector is
* registered or has not yet been registered with userspace.
*/
static inline bool
drm_connector_is_unregistered(struct drm_connector *connector)
{
return READ_ONCE(connector->registration_state) ==
DRM_CONNECTOR_UNREGISTERED;
}
const char *drm_get_connector_status_name(enum drm_connector_status status);
const char *drm_get_subpixel_order_name(enum subpixel_order order);
const char *drm_get_dpms_name(int val);