Error Codes

GSP Error Codes

Standard POSIX Errors (Negative Return Values)

Code	Hex	Name	Description
0	0x00000000	OK	Success
-1	0xFFFFFFFF	EPERM	Operation not permitted
-2	0xFFFFFFFE	ENOENT	No such file/entry
-3	0xFFFFFFFD	EINVAL	Invalid argument
-6	0xFFFFFFFA	ENODEV	No such device
-12	0xFFFFFFF4	ENOMEM	Out of memory
-16	0xFFFFFFEE	EBUSY	Device/resource busy
-22	0xFFFFFFEA	EINVAL	Invalid argument
-28	0xFFFFFFE4	ENOSPC	No space left on device
-37	0xFFFFFFDB	ENOLCK	No locks available
-56	0xFFFFFFC8	EBADMSG	Bad message
-84	0xFFFFFFAC	EOVERFLOW	Value too large
-90	0xFFFFA6	ENOSTR	Not a stream
-91	0xFFFFA5	ENODATA	No data available
-94	0xFFFFA2	ENOSR	Out of streams resources
-97	0xFFFFFF9F	EPROTO	Protocol error
-111	0xFFFFFF91	ETIMEDOUT	Connection timed out

GSP-Specific Error Codes (Observed in Firmware)

Memory Errors

Code	Hex	Name	Description
0x1E	0x0000001E	ETIME	WPR/RPC timeout
0x1F	0x0000001F	EDEV	Device error
0x25	0x00000025	EOVERFLOW	Region/offset overflow
0x37	0x00000037	EINVAL	Invalid alignment/size
0x51	0x00000051	ENOMEM	Allocator exhausted
0x56	0x00000056	EBUSY	Resource busy
0xFFFF	0xFFFFFFFF	EPERM	Permission denied

RPC Errors

Code	Hex	Name	Description
0x1D	0x0000001D	EFAULT	Bad address in RPC
0x1E	0x0000001E	ETIMEDOUT	RPC timeout
0x1F	0x0000001F	EPROTO	Protocol violation
0x20	0x00000020	EBADRPC	Invalid RPC type
0x21	0x00000021	EBADSEQ	Sequence mismatch
0x22	0x00000022	EBADSIZE	Payload size error

BAR Errors

Code	Hex	Name	Description
0x30	0x00000030	EBARINVAL	Invalid BAR index
0x31	0x00000031	EBARPERM	BAR access denied
0x32	0x00000032	EBARSIZE	Aperture size error
0x33	0x00000033	EBARALIGN	Alignment error
0x34	0x00000034	EBARRANGE	Offset out of range
0x35	0x00000035	EBARBUSY	BAR busy

WPR Errors

Code	Hex	Name	Description
0x40	0x00000040	EWPRINVAL	Invalid WPR region
0x41	0x00000041	EWPRPERM	WPR permission denied
0x42	0x00000042	EWPROVERLAP	Overlapping WPR regions
0x43	0x00000043	EWPRBUSY	WPR operation in progress
0x44	0x00000044	EWPRTIMEOUT	WPR timeout

Migration Errors

Code	Hex	Name	Description
0x50	0x00000050	EMIGINVAL	Invalid migration phase
0x51	0x00000051	EMIGNOMEM	Migration buffer OOM
0x52	0x00000052	EMIGBUSY	Migration in progress
0x53	0x00000053	EMIGPHASE	Phase mismatch
0x54	0x00000054	EMIGVERIFY	Verification failed
0x55	0x00000055	EMIGCOMMIT	Commit failed
0x56	0x00000056	EMIGABORT	Migration aborted

Scheduler Errors

Code	Hex	Name	Description
0x60	0x00000060	ESCHINVAL	Invalid schedule params
0x61	0x00000061	ESCHPRIO	Priority error
0x62	0x00000062	ESCHYIELD	Yield failed
0x63	0x00000063	ESCHPREEMPT	Preemption error

Notification Errors

Code	Hex	Name	Description
0x70	0x00000070	ENOTIFYINVAL	Invalid notification
0x71	0x00000071	ENOTIFYBUSY	Notification queue full
0x72	0x00000072	ENOTIFYDROP	Notification dropped

Error Code Mapping (Kernel Driver)

<syntaxhighlight lang="c">static int gsp_errno_to_errno(int gsp_err) {

   switch (gsp_err) {
   case 0: return 0;
   case -1: return -EPERM;
   case -2: return -ENOENT;
   case -3: return -EINVAL;
   case -6: return -ENODEV;
   case -12: return -ENOMEM;
   case -16: return -EBUSY;
   case -22: return -EINVAL;
   case -28: return -ENOSPC;
   case -37: return -ENOLCK;
   case -56: return -EBADMSG;
   case -84: return -EOVERFLOW;
   case -90: return -ENOSTR;
   case -91: return -ENODATA;
   case -94: return -ENOSR;
   case -97: return -EPROTO;
   case -111: return -ETIMEDOUT;
   
   // GSP-specific
   case 0x1E: return -ETIMEDOUT;
   case 0x1F: return -EIO;
   case 0x25: return -EOVERFLOW;
   case 0x37: return -EINVAL;
   case 0x51: return -ENOMEM;
   case 0x56: return -EBUSY;
   case 0xFFFF: return -EPERM;
   
   // BAR
   case 0x30: return -EINVAL;
   case 0x31: return -EPERM;
   case 0x32: return -EINVAL;
   case 0x33: return -EINVAL;
   case 0x34: return -ERANGE;
   case 0x35: return -EBUSY;
   
   // WPR
   case 0x40: return -EINVAL;
   case 0x41: return -EPERM;
   case 0x42: return -EEXIST;
   case 0x43: return -EBUSY;
   case 0x44: return -ETIMEDOUT;
   
   // Migration
   case 0x50: return -EINVAL;
   case 0x51: return -ENOMEM;
   case 0x52: return -EBUSY;
   case 0x53: return -EINVAL;
   case 0x54: return -EIO;
   case 0x55: return -EIO;
   case 0x56: return -ECANCELED;
   
   // Scheduler
   case 0x60: return -EINVAL;
   case 0x61: return -EINVAL;
   case 0x62: return -EAGAIN;
   case 0x63: return -EAGAIN;
   
   // Notification
   case 0x70: return -EINVAL;
   case 0x71: return -EAGAIN;
   case 0x72: return -ENOBUFS;
   
   default: return -EIO;
   }

}</syntaxhighlight>

Debugging Error Codes

GSP Log Format

GSP_ERROR: rpc_type=0x0A seq=0x1234 err=0x31 (EBARPERM) vf=2 addr=0x7F000000

Common Error Scenarios

Scenario	Error Code	Resolution
VF writes to unmapped BAR	0x31 (EBARPERM)	Check VF BAR config
Migration verify fails	0x54 (EMIGVERIFY)	Check memory integrity
WPR timeout on page fault	0x44 (EWPRTIMEOUT)	Increase timeout
RPC sequence mismatch	0x21 (EBADSEQ)	Reset RPC client
Allocator exhausted	0x51 (ENOMEM)	Free unused VF memory
BAR aperture too small	0x32 (EBARSIZE)	Increase aperture

Error Injection (Testing)

<syntaxhighlight lang="c">// Inject errors for testing

1. define GSP_INJECT_ERROR(rpc_type, err_code) \

   gsp_test_inject_error(gsp, rpc_type, err_code)

void gsp_test_inject_error(struct gsp_device *gsp,

                          uint32_t rpc_type, int err_code) {
   struct inject_payload p = {.rpc_type = rpc_type,.error_code = err_code,.enable = 1,
   };
   gsp_rpc_send_sync(gsp->rpc, RPC_DEBUG, &p, sizeof(p), NULL, NULL);

}</syntaxhighlight>