diff options
Diffstat (limited to 'src/usr/xscom/xscom.C')
| -rw-r--r-- | src/usr/xscom/xscom.C | 48 |
1 files changed, 47 insertions, 1 deletions
diff --git a/src/usr/xscom/xscom.C b/src/usr/xscom/xscom.C index fb487c55b..b112b2294 100644 --- a/src/usr/xscom/xscom.C +++ b/src/usr/xscom/xscom.C @@ -5,7 +5,7 @@ /* */ /* OpenPOWER HostBoot Project */ /* */ -/* Contributors Listed Below - COPYRIGHT 2011,2016 */ +/* Contributors Listed Below - COPYRIGHT 2011,2017 */ /* [+] International Business Machines Corp. */ /* */ /* */ @@ -47,6 +47,7 @@ #include <errl/errludlogregister.H> #include <xscom/piberror.H> #include <arch/pirformat.H> +#include <lpc/lpcif.H> // Trace definition trace_desc_t* g_trac_xscom = NULL; @@ -701,6 +702,38 @@ void collectXscomFFDC(TARGETING::Target* i_target, /////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////// +bool checkForLpcBug( void ) +{ + // See HW400314 for description of hardware bug + // The Power Bus Snooper Interface on the ADU is shared by both PIB + // and LPC. Once an error occurred in the Xscom while accessing the + // PIB space, the interface is overriding the data that is sent out + // as all ?F? for any operation which may be XSCOM to PIB address + // space or to a LPC address Space. Further XSCOM operation are + // locked till the pending error is cleared. But an XSCOM Status + // pmisc is sent with pib response info (in this case the type of + // the error) and for the next operations i.e. XSCOM to PIB or to + // LPC it sends info value as 1 which indicates ADU has pending + // XSCOM Error. This is indicated in the (48 :50) bits in the address + // sent. + + ProcessorCoreType l_coreType = cpu_core_type(); + uint8_t l_ddLevel = cpu_dd_level(); + + // Bug is only present in Nimbus DD1 + if( (l_coreType == CORE_POWER9_NIMBUS) && (l_ddLevel == 0x10) ) + { + TRACFCOMP( g_trac_xscom, "Activating LPC mutex workaround" ); + return true; + } + else + { + return false; + } +} + +/////////////////////////////////////////////////////////////////////////////// +/////////////////////////////////////////////////////////////////////////////// errlHndl_t xscomPerformOp(DeviceFW::OperationType i_opType, TARGETING::Target* i_target, void* io_buffer, @@ -738,6 +771,13 @@ errlHndl_t xscomPerformOp(DeviceFW::OperationType i_opType, // Pin this thread to current CPU task_affinity_pin(); + // Block the LPC driver from running while an xscom is in progress + static bool l_hasLpcBug = checkForLpcBug(); + if( l_hasLpcBug ) + { + LPC::block_lpc_ops(true); + } + // Lock other XSCom in this same thread from running l_XSComMutex = mmio_xscom_mutex(); mutex_lock(l_XSComMutex); @@ -778,6 +818,12 @@ errlHndl_t xscomPerformOp(DeviceFW::OperationType i_opType, // Unlock mutex_unlock(l_XSComMutex); + // Unblock the LPC driver + if( l_hasLpcBug ) + { + LPC::block_lpc_ops(false); + } + // Done, un-pin task_affinity_unpin(); |
