]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
MIPS: Loongson 3: Add CPU hotplug support
authorHuacai Chen <chenhc@lemote.com>
Fri, 21 Mar 2014 10:44:09 +0000 (18:44 +0800)
committerRalf Baechle <ralf@linux-mips.org>
Mon, 31 Mar 2014 16:17:12 +0000 (18:17 +0200)
commitc4a987db1b3cd89207cece4b8121c09cbfbc978a
treed9dc9db58b7259ac9e986b948e8b9c0abbebff39
parent300459d558725cdada5ddebbe52c24ef6e1853d3
MIPS: Loongson 3: Add CPU hotplug support

Tips of Loongson's CPU hotplug:
1, To fully shutdown a core in Loongson 3, the target core should go to
   CKSEG1 and flush all L1 cache entries at first. Then, another core
   (usually Core 0) can safely disable the clock of the target core. So
   play_dead() call loongson3_play_dead() via CKSEG1 (both uncached and
   unmmaped).
2, The default clocksource of Loongson is MIPS. Since clock source is a
   global device, timekeeping need the CP0' Count registers of each core
   be synchronous. Thus, when a core is up, we use a SMP_ASK_C0COUNT IPI
   to ask Core-0's Count.

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Hongliang Tao <taohl@lemote.com>
Signed-off-by: Hua Yan <yanh@lemote.com>
Tested-by: Alex Smith <alex.smith@imgtec.com>
Reviewed-by: Alex Smith <alex.smith@imgtec.com>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/6639
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
arch/mips/include/asm/mach-loongson/irq.h
arch/mips/include/asm/mach-loongson/loongson.h
arch/mips/include/asm/smp.h
arch/mips/loongson/Kconfig
arch/mips/loongson/loongson-3/irq.c
arch/mips/loongson/loongson-3/smp.c