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Commit e6332b05 authored by Marin Shalamanov's avatar Marin Shalamanov
Browse files

SF backdoor for primary display hotplug 

This is a backdoor for SurfaceFlinger which injects a hotplug
event for the primary display. This causes SF to deallocate and
reallocate the  display state including framebuffers. From the
user perspective this should look like a noop because HWC will
return the same display properties.

Bug: 167670568
Test: adb shell service call SurfaceFlinger 1037
Change-Id: Ie52aac67571ed41c1a796797b7d7c54bcbdd9bdc
parent 8ff31f2c

services/surfaceflinger/SurfaceFlinger.cpp

+19 −2
Original line number Diff line number Diff line
@@ -5035,9 +5035,9 @@ status_t SurfaceFlinger::CheckTransactCodeCredentials(uint32_t code) { 
        code == IBinder::SYSPROPS_TRANSACTION) {

        return OK;

    }

    // Numbers from 1000 to 1036 are currently used for backdoors. The code

    // Numbers from 1000 to 1037 are currently used for backdoors. The code

    // in onTransact verifies that the user is root, and has access to use SF.

    if (code >= 1000 && code <= 1036) {

    if (code >= 1000 && code <= 1037) {

        ALOGV("Accessing SurfaceFlinger through backdoor code: %u", code);

        return OK;

    }
@@ -5379,6 +5379,23 @@ status_t SurfaceFlinger::onTransact(uint32_t code, const Parcel& data, Parcel* r 
                }

                return NO_ERROR;

            }

            // Inject a hotplug connected event for the primary display. This will deallocate and

            // reallocate the display state including framebuffers.

            case 1037: {

                const auto token = getInternalDisplayToken();



                sp<DisplayDevice> display;

                {

                    Mutex::Autolock lock(mStateLock);

                    display = getDisplayDeviceLocked(token);

                }

                const auto hwcId =

                        getHwComposer().fromPhysicalDisplayId(PhysicalDisplayId(*display->getId()));



                onHotplugReceived(getBE().mComposerSequenceId, *hwcId, hal::Connection::CONNECTED);



                return NO_ERROR;

            }

        }

    }

    return err;