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[host] service: retry a few times when host fails to restart

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Certain users of Radeon cards have observed that the host fails to start
at boot, with D3D11CreateDevice failing with HSTATUS 0x887a0004, which
translates to "The specified device interface or feature level is not
supported on this system."

This failure results in a LG_HOST_EXIT_FAILED exit code, which the service
does not attempt to restart. The user has to manually restart the service
for the host application to work.

These users reported that the host application started fine on
B2. This strongly suggests that the fix to enable capturing the login
screen made the host application start too early during the boot process,
and the graphics driver did not have time to initialize fully.

This PR allows the service to retry a few times on LG_HOST_EXIT_FAILED,
with exponential backoff, before giving up. This should cover this bug
and other similar bugs related to the early initialization which I do not
have logs for.
This commit is contained in:
Quantum 2021-03-18 02:56:21 -04:00 committed by Geoffrey McRae
parent a4290b290b
commit c12c6ea3c7
1 changed files with 20 additions and 2 deletions
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22
host/platform/Windows/src/service.c
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@ -41,6 +41,9 @@ Place, Suite 330, Boston, MA 02111-1307 USA
#define SVC_ERROR ((DWORD)0xC0020001L)
#define LOG_NAME "looking-glass-host-service.txt"
#define FAIL_MAX_RETRIES 5
#define FAIL_RETRY_INIT_INTERVAL 1000
/*
* Windows 10 provides this API via kernel32.dll as well as advapi32.dll and
* mingw opts for linking against the kernel32.dll version which is fine
@ -644,6 +647,8 @@ VOID WINAPI SvcMain(DWORD dwArgc, LPTSTR *lpszArgv)
ivshmemFree(&shmDev);
ReportSvcStatus(SERVICE_RUNNING, NO_ERROR, 0);
int failCount = 0;
while(1)
{
ULONGLONG launchTime = 0ULL;
@ -689,15 +694,28 @@ VOID WINAPI SvcMain(DWORD dwArgc, LPTSTR *lpszArgv)
case LG_HOST_EXIT_CAPTURE:
doLog("Host application exited due to capture error; restarting\n");
failCount = 0;
break;
case LG_HOST_EXIT_KILLED:
doLog("Host application was killed; restarting\n");
failCount = 0;
break;
case LG_HOST_EXIT_FAILED:
doLog("Host application failed to start; will not restart\n");
goto stopped;
{
++failCount;
if (failCount > FAIL_MAX_RETRIES)
{
doLog("Host application failed to start %d times; will not restart\n", FAIL_MAX_RETRIES);
goto stopped;
}
DWORD backoff = FAIL_RETRY_INIT_INTERVAL << (failCount - 1);
doLog("Host application failed to start %d times, waiting %u ms...\n", failCount, backoff);
Sleep(backoff);
break;
}
default:
doLog("Host application failed due to unknown error; restarting\n");