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| author | Huacai Chen <chenhc@lemote.com> | 2014-03-21 10:44:09 (GMT) |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2014-03-31 16:17:12 (GMT) |
| commit | c4a987db1b3cd89207cece4b8121c09cbfbc978a (patch) | |
| tree | d9dc9db58b7259ac9e986b948e8b9c0abbebff39 /arch/mips/loongson/Kconfig | |
| parent | 300459d558725cdada5ddebbe52c24ef6e1853d3 (diff) | |
| download | linux-c4a987db1b3cd89207cece4b8121c09cbfbc978a.tar.xz | |
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>
Diffstat (limited to 'arch/mips/loongson/Kconfig')
| -rw-r--r-- | arch/mips/loongson/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/mips/loongson/Kconfig b/arch/mips/loongson/Kconfig index a5d46f5..7397be2 100644 --- a/arch/mips/loongson/Kconfig +++ b/arch/mips/loongson/Kconfig @@ -79,6 +79,7 @@ config LEMOTE_MACH3A select SYS_HAS_CPU_LOONGSON3 select SYS_HAS_EARLY_PRINTK select SYS_SUPPORTS_SMP + select SYS_SUPPORTS_HOTPLUG_CPU select SYS_SUPPORTS_64BIT_KERNEL select SYS_SUPPORTS_HIGHMEM select SYS_SUPPORTS_LITTLE_ENDIAN |