CVS commit: src/sys

["Jason R Thorpe" <thorpej%netbsd.org@localhost>]

Module Name:    src
Committed By:   thorpej
Date:           Wed Mar 11 13:30:31 UTC 2020

Modified Files:
        src/sys/arch/mips/mips: pmap_machdep.c
        src/sys/arch/powerpc/booke: booke_pmap.c
        src/sys/arch/powerpc/include/booke: pmap.h
        src/sys/arch/riscv/include: pmap.h
        src/sys/arch/riscv/riscv: pmap_machdep.c riscv_machdep.c
        src/sys/uvm/pmap: pmap.c pmap.h

Log Message:
With DEBUG defined, it's possible to execute a TLB-vs-segmap consistency
check from a (soft) interrupt handler.  But if a platform does not otherwise
require the pmap_tlb_miss_lock, then where will be a brief window of
inconsistency that, while harmless, will still fire an assertion in the
consistency check.

Fix this with the following changes:
1- Refactor the pmap_tlb_miss_lock into MI code and rename it from
   pmap_tlb_miss_lock_{enter,exit}() to pmap_tlb_miss_lock_{enter,exit}().
   MD code can still define the "md" hooks as necessary, and if so, will
   override the common implementation.
2- Provde a pmap_bootstrap_common() function to perform common pmap bootstrap
   operations, namely initializing the pmap_tlb_miss_lock if it's needed.
   If MD code overrides the implementation, it's responsible for initializing
   its own lock.
3- Call pmap_bootstrap_common() from the mips, powerpc booke, and riscv
   pmap_bootstrap() routines.  (This required adding one for riscv.)
4- Switch powerpc booke to the common pmap_tlb_miss_lock.
5- Enable pmap_tlb_miss_lock if DEBUG is defined, even if it's not otherwise
   required.

PR port-mips/55062 (Failed assertion in pmap_md_tlb_check_entry())


To generate a diff of this commit:
cvs rdiff -u -r1.26 -r1.27 src/sys/arch/mips/mips/pmap_machdep.c
cvs rdiff -u -r1.26 -r1.27 src/sys/arch/powerpc/booke/booke_pmap.c
cvs rdiff -u -r1.18 -r1.19 src/sys/arch/powerpc/include/booke/pmap.h
cvs rdiff -u -r1.3 -r1.4 src/sys/arch/riscv/include/pmap.h
cvs rdiff -u -r1.4 -r1.5 src/sys/arch/riscv/riscv/pmap_machdep.c
cvs rdiff -u -r1.8 -r1.9 src/sys/arch/riscv/riscv/riscv_machdep.c
cvs rdiff -u -r1.45 -r1.46 src/sys/uvm/pmap/pmap.c
cvs rdiff -u -r1.12 -r1.13 src/sys/uvm/pmap/pmap.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.