* [PATCH] Hibernation Support in mips system
@ 2009-06-02 15:31 wuzhangjin
2009-06-03 11:21 ` Ralf Baechle
2009-06-03 11:24 ` Pavel Machek
0 siblings, 2 replies; 3+ messages in thread
From: wuzhangjin @ 2009-06-02 15:31 UTC (permalink / raw)
To: linux-mips, ralf
Cc: Arnaud Patard, Atsushi Nemoto, yan hua, Zhang Fuxin,
Pavel Machek, Wu Zhangjin, Hongbing Hu
From: Wu Zhangjin <wuzj@lemote.com>
This is originally pulled from the to-mips branch of
http://dev.lemote.com/code/linux_loongson, only a few coding style
tuning under the support of script/checkpatch.pl
as the feedback from Atsushi Nemoto,Yanhua and Pavel Machek, some changes
have been done by Hu Hongbing(the original author of mips-specific STD)
from Lemote.com. this patch apply the changes, which include:
Reviewed-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: yanh <yanh@lemote.com>
Reviewed-by: Arnaud Patard <apatard@mandriva.com>
Reviewed-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Wu Zhangjin <wuzj@lemote.com>
Signed-off-by: Hongbing Hu <huhb@lemote.com>
---
arch/mips/Kconfig | 3 ++
arch/mips/Makefile | 3 ++
arch/mips/include/asm/suspend.h | 5 ++-
arch/mips/kernel/asm-offsets.c | 13 +++++++
arch/mips/power/Makefile | 1 +
arch/mips/power/cpu.c | 31 ++++++++++++++++++
arch/mips/power/hibernate.S | 67 +++++++++++++++++++++++++++++++++++++++
7 files changed, 122 insertions(+), 1 deletions(-)
create mode 100644 arch/mips/power/Makefile
create mode 100644 arch/mips/power/cpu.c
create mode 100644 arch/mips/power/hibernate.S
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index c7d1d08..4423d82 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2128,6 +2128,9 @@ endmenu
menu "Power management options"
+config ARCH_HIBERNATION_POSSIBLE
+ def_bool y
+
config ARCH_SUSPEND_POSSIBLE
def_bool y
depends on !SMP
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 6d39fdf..361a30d 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -685,6 +685,9 @@ core-y += arch/mips/kernel/ arch/mips/mm/ arch/mips/math-emu/
drivers-$(CONFIG_OPROFILE) += arch/mips/oprofile/
+# suspend and hibernation support
+drivers-$(CONFIG_PM) += arch/mips/power/
+
ifdef CONFIG_LASAT
rom.bin rom.sw: vmlinux
$(Q)$(MAKE) $(build)=arch/mips/lasat/image $@
diff --git a/arch/mips/include/asm/suspend.h b/arch/mips/include/asm/suspend.h
index 2562f8f..294cdb6 100644
--- a/arch/mips/include/asm/suspend.h
+++ b/arch/mips/include/asm/suspend.h
@@ -1,6 +1,9 @@
#ifndef __ASM_SUSPEND_H
#define __ASM_SUSPEND_H
-/* Somewhen... Maybe :-) */
+static inline int arch_prepare_suspend(void) { return 0; }
+
+/* References to section boundaries */
+extern const void __nosave_begin, __nosave_end;
#endif /* __ASM_SUSPEND_H */
diff --git a/arch/mips/kernel/asm-offsets.c b/arch/mips/kernel/asm-offsets.c
index c901c22..8d006ec 100644
--- a/arch/mips/kernel/asm-offsets.c
+++ b/arch/mips/kernel/asm-offsets.c
@@ -14,6 +14,7 @@
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/kbuild.h>
+#include <linux/suspend.h>
#include <asm/ptrace.h>
#include <asm/processor.h>
@@ -326,3 +327,15 @@ void output_octeon_cop2_state_defines(void)
BLANK();
}
#endif
+
+#ifdef CONFIG_HIBERNATION
+void output_pbe_defines(void)
+{
+ COMMENT(" Linux struct pbe offsets. ");
+ OFFSET(PBE_ADDRESS, pbe, address);
+ OFFSET(PBE_ORIG_ADDRESS, pbe, orig_address);
+ OFFSET(PBE_NEXT, pbe, next);
+ DEFINE(PBE_SIZE, sizeof(struct pbe));
+ BLANK();
+}
+#endif
diff --git a/arch/mips/power/Makefile b/arch/mips/power/Makefile
new file mode 100644
index 0000000..73d56b8
--- /dev/null
+++ b/arch/mips/power/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_HIBERNATION) += cpu.o hibernate.o
diff --git a/arch/mips/power/cpu.c b/arch/mips/power/cpu.c
new file mode 100644
index 0000000..5fe43e5
--- /dev/null
+++ b/arch/mips/power/cpu.c
@@ -0,0 +1,31 @@
+/*
+ * Suspend support specific for mips.
+ *
+ */
+#include <linux/mm.h>
+#include <linux/suspend.h>
+#include <asm/mipsregs.h>
+#include <asm/page.h>
+#include <asm/suspend.h>
+#include <asm/ptrace.h>
+
+static uint32_t saved_status;
+struct pt_regs saved_regs;
+
+void save_processor_state(void)
+{
+ saved_status = read_c0_status();
+}
+
+void restore_processor_state(void)
+{
+ write_c0_status(saved_status);
+}
+
+int pfn_is_nosave(unsigned long pfn)
+{
+ unsigned long nosave_begin_pfn = PFN_DOWN(__pa(&__nosave_begin));
+ unsigned long nosave_end_pfn = PFN_UP(__pa(&__nosave_end));
+
+ return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
+}
diff --git a/arch/mips/power/hibernate.S b/arch/mips/power/hibernate.S
new file mode 100644
index 0000000..4ca9149
--- /dev/null
+++ b/arch/mips/power/hibernate.S
@@ -0,0 +1,67 @@
+#incldue <linux/linkage.h>
+#include <asm/asm-offsets.h>
+#include <asm/regdef.h>
+#include <asm/asm.h>
+
+ .extern __flush_cache_all
+#ifdef CONFIG_SMP
+ .extern flush_tlb_all
+#else
+ .extern local_flush_tlb_all
+#define flush_tlb_all local_flush_tlb_all
+#endif
+
+.text
+LEAF(swsusp_arch_suspend)
+ PTR_LA t0, saved_regs
+ PTR_S ra, PT_R31(t0)
+ PTR_S sp, PT_R29(t0)
+ PTR_S fp, PT_R30(t0)
+ PTR_S gp, PT_R28(t0)
+ PTR_S s0, PT_R16(t0)
+ PTR_S s1, PT_R17(t0)
+ PTR_S s2, PT_R18(t0)
+ PTR_S s3, PT_R19(t0)
+ PTR_S s4, PT_R20(t0)
+ PTR_S s5, PT_R21(t0)
+ PTR_S s6, PT_R22(t0)
+ PTR_S s7, PT_R23(t0)
+ j swsusp_save
+END(swsusp_arch_suspend)
+
+LEAF(swsusp_arch_resume)
+ PTR_L t0, restore_pblist
+0:
+ PTR_L t1, PBE_ADDRESS(t0) /* source */
+ PTR_L t2, PBE_ORIG_ADDRESS(t0) /* destination */
+ PTR_ADDIU t3, t1, _PAGE_SIZE
+1:
+ REG_L t8, (t1)
+ REG_S t8, (t2)
+ PTR_ADDIU t1, t1, SZREG
+ PTR_ADDIU t2, t2, SZREG
+ bne t1, t3, 1b
+ PTR_L t0, PBE_NEXT(t0)
+ bnez t0, 0b
+ /* flush caches to make sure context is in memory */
+ PTR_L t0, __flush_cache_all
+ jalr t0
+ /* flush tlb entries */
+ PTR_LA t0, flush_tlb_all
+ jalr t0
+ PTR_LA t0, saved_regs
+ PTR_L ra, PT_R31(t0)
+ PTR_L sp, PT_R29(t0)
+ PTR_L fp, PT_R30(t0)
+ PTR_L gp, PT_R28(t0)
+ PTR_L s0, PT_R16(t0)
+ PTR_L s1, PT_R17(t0)
+ PTR_L s2, PT_R18(t0)
+ PTR_L s3, PT_R19(t0)
+ PTR_L s4, PT_R20(t0)
+ PTR_L s5, PT_R21(t0)
+ PTR_L s6, PT_R22(t0)
+ PTR_L s7, PT_R23(t0)
+ PTR_LI v0, 0x0
+ jr ra
+END(swsusp_arch_resume)
--
1.6.0.4
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] Hibernation Support in mips system
2009-06-02 15:31 [PATCH] Hibernation Support in mips system wuzhangjin
@ 2009-06-03 11:21 ` Ralf Baechle
2009-06-03 11:24 ` Pavel Machek
1 sibling, 0 replies; 3+ messages in thread
From: Ralf Baechle @ 2009-06-03 11:21 UTC (permalink / raw)
To: wuzhangjin
Cc: linux-mips, Arnaud Patard, Atsushi Nemoto, yan hua, Zhang Fuxin,
Pavel Machek, Wu Zhangjin, Hongbing Hu
On Tue, Jun 02, 2009 at 11:31:42PM +0800, wuzhangjin@gmail.com wrote:
> diff --git a/arch/mips/power/cpu.c b/arch/mips/power/cpu.c
> new file mode 100644
> index 0000000..5fe43e5
> --- /dev/null
> +++ b/arch/mips/power/cpu.c
> @@ -0,0 +1,31 @@
> +/*
> + * Suspend support specific for mips.
> + *
> + */
> +#include <linux/mm.h>
> +#include <linux/suspend.h>
> +#include <asm/mipsregs.h>
> +#include <asm/page.h>
> +#include <asm/suspend.h>
> +#include <asm/ptrace.h>
> +
> +static uint32_t saved_status;
> +struct pt_regs saved_regs;
> +
> +void save_processor_state(void)
> +{
> + saved_status = read_c0_status();
> +}
> +
> +void restore_processor_state(void)
> +{
> + write_c0_status(saved_status);
> +}
> +
> +int pfn_is_nosave(unsigned long pfn)
> +{
> + unsigned long nosave_begin_pfn = PFN_DOWN(__pa(&__nosave_begin));
> + unsigned long nosave_end_pfn = PFN_UP(__pa(&__nosave_end));
> +
> + return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
> +}
I'm missing FPU handling here.
> diff --git a/arch/mips/power/hibernate.S b/arch/mips/power/hibernate.S
> new file mode 100644
> index 0000000..4ca9149
> --- /dev/null
> +++ b/arch/mips/power/hibernate.S
> @@ -0,0 +1,67 @@
> +#incldue <linux/linkage.h>
> +#include <asm/asm-offsets.h>
> +#include <asm/regdef.h>
> +#include <asm/asm.h>
> +
> + .extern __flush_cache_all
> +#ifdef CONFIG_SMP
> + .extern flush_tlb_all
> +#else
> + .extern local_flush_tlb_all
> +#define flush_tlb_all local_flush_tlb_all
> +#endif
For ease of maintenance, could you do these flushes from C code and only
do the bits that absolutely must be done in assembler, in assembler?
> + /* flush caches to make sure context is in memory */
> + PTR_L t0, __flush_cache_all
> + jalr t0
> + /* flush tlb entries */
> + PTR_LA t0, flush_tlb_all
In addition to the above said - there is no PTR_L JALR sequence needed here
because this code is never compiled as a loadable module. So a jal would
do the job.
All in all this is looking much better than the first version!
Ralf
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] Hibernation Support in mips system
2009-06-02 15:31 [PATCH] Hibernation Support in mips system wuzhangjin
2009-06-03 11:21 ` Ralf Baechle
@ 2009-06-03 11:24 ` Pavel Machek
1 sibling, 0 replies; 3+ messages in thread
From: Pavel Machek @ 2009-06-03 11:24 UTC (permalink / raw)
To: wuzhangjin
Cc: linux-mips, ralf, Arnaud Patard, Atsushi Nemoto, yan hua,
Zhang Fuxin, Wu Zhangjin, Hongbing Hu
On Tue 2009-06-02 23:31:42, wuzhangjin@gmail.com wrote:
> From: Wu Zhangjin <wuzj@lemote.com>
>
> This is originally pulled from the to-mips branch of
> http://dev.lemote.com/code/linux_loongson, only a few coding style
> tuning under the support of script/checkpatch.pl
>
> as the feedback from Atsushi Nemoto,Yanhua and Pavel Machek, some changes
> have been done by Hu Hongbing(the original author of mips-specific STD)
> from Lemote.com. this patch apply the changes, which include:
>
> Reviewed-by: Pavel Machek <pavel@ucw.cz>
The patch looks ok, but I don't think I offered that tag before. You
can add it now.
> @@ -0,0 +1,31 @@
> +/*
> + * Suspend support specific for mips.
"Hibernation support"? Copyright, GPL, author info?
> +#include <linux/mm.h>
> +#include <linux/suspend.h>
> +#include <asm/mipsregs.h>
> +#include <asm/page.h>
> +#include <asm/suspend.h>
> +#include <asm/ptrace.h>
> +
> +static uint32_t saved_status;
"u32" please.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2009-06-03 11:24 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2009-06-02 15:31 [PATCH] Hibernation Support in mips system wuzhangjin
2009-06-03 11:21 ` Ralf Baechle
2009-06-03 11:24 ` Pavel Machek
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.