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charset="utf-8" RTAS_FN_IBM_OPEN_ERRINJCT returns results in special format: rets[0] =3D session token (output) rets[1] =3D status code rets[2..] =3D additional outputs (if any) Unlike standard RTAS calls where: rets[0] =3D status code rets[1..] =3D outputs This patch adds special handling for OPEN_ERRINJCT to: 1. Check correct status position (rets[1]) for __fetch_rtas_last_error() 2. Copy all rets[0..nret-1] to outputs[] (including token at rets[0]) 3. Return status from rets[1] instead of rets[0] Reference: OpenPOWER PAPR documentation https://files.openpower.foundation/s/XFgfMaqLMD5Bcm8 Signed-off-by: Narayana Murty N --- arch/powerpc/kernel/rtas.c | 30 ++++++++++++++++++++++++------ 1 file changed, 24 insertions(+), 6 deletions(-) diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c index 8d81c1e7a8db..04c8438aadda 100644 --- a/arch/powerpc/kernel/rtas.c +++ b/arch/powerpc/kernel/rtas.c @@ -1183,7 +1183,7 @@ int rtas_call(int token, int nargs, int nret, int *ou= tputs, ...) unsigned long flags; struct rtas_args *args; char *buff_copy =3D NULL; - int ret; + int ret =3D 0; =20 if (!rtas.entry || token =3D=3D RTAS_UNKNOWN_SERVICE) return -1; @@ -1213,15 +1213,33 @@ int rtas_call(int token, int nargs, int nret, int *= outputs, ...) va_rtas_call_unlocked(args, token, nargs, nret, list); va_end(list); =20 + /* Special handling for RTAS_FN_IBM_OPEN_ERRINJCT for error fetching */ /* A -1 return code indicates that the last command couldn't be completed due to a hardware error. */ - if (be32_to_cpu(args->rets[0]) =3D=3D -1) + + if (token =3D=3D rtas_function_token(RTAS_FN_IBM_OPEN_ERRINJCT) && nret >= 1) + ret =3D be32_to_cpu(args->rets[1]); + else if (nret > 0) + ret =3D be32_to_cpu(args->rets[0]); + + if (ret =3D=3D -1) buff_copy =3D __fetch_rtas_last_error(NULL); =20 - if (nret > 1 && outputs !=3D NULL) - for (i =3D 0; i < nret-1; ++i) - outputs[i] =3D be32_to_cpu(args->rets[i + 1]); - ret =3D (nret > 0) ? be32_to_cpu(args->rets[0]) : 0; + /* Handle outputs and return status */ + if (nret > 1 && outputs !=3D NULL) { + if (token =3D=3D rtas_function_token(RTAS_FN_IBM_OPEN_ERRINJCT)) { + /* Special case: rets[0]=3Dtoken, rets[1]=3Dstatus, rets[2..]=3Doutputs= */ + for (i =3D 0; i < nret; ++i) + outputs[i] =3D be32_to_cpu(args->rets[i]); + } else { + /* Normal case: rets[0]=3Dstatus, rets[1..]=3Doutputs */ + for (i =3D 0; i < nret - 1; ++i) + outputs[i] =3D be32_to_cpu(args->rets[i + 1]); + } + } else { + /* No outputs: just ret is status */ + ret =3D (nret > 0) ? be32_to_cpu(args->rets[0]) : 0; + } =20 lockdep_unpin_lock(&rtas_lock, cookie); raw_spin_unlock_irqrestore(&rtas_lock, flags); --=20 2.51.1