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| author | Huacai Chen <chenhc@lemote.com> | 2014-03-21 11:44:08 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2014-03-31 18:17:12 +0200 |
| commit | 300459d558725cdada5ddebbe52c24ef6e1853d3 (patch) | |
| tree | fb93b1d6c2845af29cce7c06ae35a3b88b7f6431 /arch/mips/loongson/loongson-3/Makefile | |
| parent | MIPS: Loongson: Add Loongson-3 Kconfig options (diff) | |
| download | linux-300459d558725cdada5ddebbe52c24ef6e1853d3.tar.xz linux-300459d558725cdada5ddebbe52c24ef6e1853d3.zip | |
MIPS: Loongson 3: Add Loongson-3 SMP support
IPI registers of Loongson-3 include IPI_SET, IPI_CLEAR, IPI_STATUS,
IPI_EN and IPI_MAILBOX_BUF. Each bit of IPI_STATUS indicate a type of
IPI and IPI_EN indicate whether the IPI is enabled. The sender write 1
to IPI_SET bits generate IPIs in IPI_STATUS, and receiver write 1 to
bits of IPI_CLEAR to clear IPIs. IPI_MAILBOX_BUF are used to deliver
more information about IPIs.
Why we change code in arch/mips/loongson/common/setup.c?
If without this change, when SMP configured, system cannot boot since
it hang at printk() in cgroup_init_early(). The root cause is:
console_trylock()
\-->down_trylock(&console_sem)
\-->raw_spin_unlock_irqrestore(&sem->lock, flags)
\-->_raw_spin_unlock_irqrestore()(SMP/UP have different versions)
\-->__raw_spin_unlock_irqrestore() (following is the SMP case)
\-->do_raw_spin_unlock()
\-->arch_spin_unlock()
\-->nudge_writes()
\-->mb()
\-->wbflush()
\-->__wbflush()
In previous code __wbflush() is initialized in plat_mem_setup(), but
cgroup_init_early() is called before plat_mem_setup(). Therefore, In
this patch we make changes to avoid boot failure.
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/6638
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/loongson/loongson-3/Makefile')
| -rw-r--r-- | arch/mips/loongson/loongson-3/Makefile | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/mips/loongson/loongson-3/Makefile b/arch/mips/loongson/loongson-3/Makefile index b9968cd1602e..70152b252ddc 100644 --- a/arch/mips/loongson/loongson-3/Makefile +++ b/arch/mips/loongson/loongson-3/Makefile @@ -2,3 +2,5 @@ # Makefile for Loongson-3 family machines # obj-y += irq.o + +obj-$(CONFIG_SMP) += smp.o |