lkml.org 
[lkml]   [2017]   [Jan]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH 0/4] ARC rework SMP boot waiting to handle IO-Coherency case
Date
ARC SMP supports halt-on-reset and run-on-reset for non master cores.
run-on-reset is applicable for internal bitfiles as well as debugger
assisted boots (where all cores are started together)

run-on-reset uses a poll-shared-flag-in-mem-n-spin approach which is not
efficient and moreover is wrong when IO-Coherency is being setup by Master
in early boot, expecting absolutely NO noise on coherency unit by other cores.

To solve this we wither need to move all the SLC/IOC setup code in head.S
which is super pain, or we make run-to-reset behave as if halt-on-reset with
hardware assist to resume the non masters at right time.

Vineet Gupta (4):
ARC: smp-boot: waiting API for run-from-reset need not jump to entry
point
ARC: smp-boot: run-on-reset: add callback to allow non masters to wait
ARCv2: smp: MCIP: remove debug aid to halt all cores when one halts
ARCv2: smp-boot: MCIP: use Inter-Core-Debug unit to kick start non
master cpus

arch/arc/include/asm/mcip.h | 1 +
arch/arc/include/asm/smp.h | 3 +++
arch/arc/kernel/head.S | 14 +++++++-------
arch/arc/kernel/mcip.c | 34 ++++++++++++++++++++++++++++++----
arch/arc/kernel/smp.c | 15 +++++++++++++--
5 files changed, 54 insertions(+), 13 deletions(-)

--
2.7.4

\
 
 \ /
  Last update: 2017-01-16 21:59    [W:0.061 / U:0.740 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site