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EDAC/i10nm: Retrieve and print retry_rd_err_log registers

Aristeu Rozanski requested to merge arozansk/centos-stream-9:arozansk-1998360 into main

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1998360
Tested: by reporter

commit cf4e6d52f58399c777276172ec250502e19d5e63
Author: Youquan Song youquan.song@intel.com
Date: Wed Aug 18 10:57:01 2021 -0700

EDAC/i10nm: Retrieve and print retry_rd_err_log registers  

Retrieve and print retry_rd_err_log registers like the earlier change:  
commit e80634a75aba ("EDAC, skx: Retrieve and print retry_rd_err_log registers")  

This is a little trickier than on Skylake because of potential  
interference with BIOS use of the same registers. The default  
behavior is to ignore these registers.  

A module parameter retry_rd_err_log(default=0) controls the mode of operation:  
- 0=off  : Default.  
- 1=bios : Linux doesn't reset any control bits, but just reports values.  
           This is "no harm" mode, but it may miss reporting some data.  
- 2=linux: Linux tries to take control and resets mode bits,  
           clears valid/UC bits after reading. This should be  
           more reliable (especially if BIOS interference is reduced  
           by disabling eMCA reporting mode in BIOS setup).  

Co-developed-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>  
Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>  
Signed-off-by: Youquan Song <youquan.song@intel.com>  
Signed-off-by: Tony Luck <tony.luck@intel.com>  
Link: https://lore.kernel.org/r/20210818175701.1611513-3-tony.luck@intel.com

Signed-off-by: Aristeu Rozanski arozansk@redhat.com

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