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sparc64: Add auxiliary vectors to report platform ADI properties

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ADI feature on M7 and newer processors has three important properties
relevant to userspace apps using ADI capabilities - (1) Size of block of
memory an ADI version tag applies to, (2) Number of uppermost bits in
virtual address used to encode ADI tag, and (3) The value M7 processor
will force the ADI tags to if it detects uncorrectable error in an ADI
tagged cacheline. Kernel can retrieve these properties for a platform
through machine description provided by the firmware. This patch adds
code to retrieve these properties and report them to userspace through
auxiliary vectors.

Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
Cc: Khalid Aziz <khalid@gonehiking.org>
Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Khalid Aziz
2018-02-21 10:15:48 -07:00
committed by David S. Miller
parent 94addb3530
commit c6202ca764
7 changed files with 168 additions and 0 deletions
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11
arch/sparc/include/uapi/asm/auxvec.h
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@@ -3,6 +3,17 @@
#define AT_SYSINFO_EHDR 33
#ifdef CONFIG_SPARC64
/* Avoid overlap with other AT_* values since they are consolidated in
* glibc and any overlaps can cause problems
*/
#define AT_ADI_BLKSZ 48
#define AT_ADI_NBITS 49
#define AT_ADI_UEONADI 50
#define AT_VECTOR_SIZE_ARCH 4
#else
#define AT_VECTOR_SIZE_ARCH 1
#endif
#endif /* !(__ASMSPARC_AUXVEC_H) */