Re: [hugang@soulinfo.com: [PATH]software suspend for ppc.]

[Nigel Cunningham <ncunningham@linuxmail.org>]

Hi Steve.

I'll use this to get Suspend2 PPC going again, if you don't mind.

Regards,

Nigel

On Mon, 2005-01-03 at 23:26, hugang@soulinfo.com wrote:
> ----- Forwarded message from hugang@soulinfo.com -----
> 
> Date: Mon, 3 Jan 2005 20:25:57 +0800
> To: benh@kernel.crashing.org
> Subject: [PATH]software suspend for ppc.
> 
> Hi Benjamin Herrenschmidt:
> 
>   Here is a patch to make ppc32 support suspend, Test passed in my
>   PowerBook, against with 2.6.10-mm1. Have a look. :)
> 
>   I'm also someone can do more test with it. 
> 
>   thanks.
> 
> --- 2.6.10-mm1/arch/ppc/Kconfig	2005-01-03 18:53:25.000000000 +0800
> +++ 2.6.10-mm1-swsusp//arch/ppc/Kconfig	2005-01-03 19:00:44.000000000 +0800
> @@ -1062,6 +1062,8 @@ config PROC_HARDWARE
>  
>  source "drivers/zorro/Kconfig"
>  
> +source "kernel/power/Kconfig"
> +
>  endmenu
>  
>  menu "Bus options"
> --- 2.6.10-mm1/arch/ppc/kernel/Makefile	2005-01-03 18:53:25.000000000 +0800
> +++ 2.6.10-mm1-swsusp//arch/ppc/kernel/Makefile	2005-01-03 19:16:34.000000000 +0800
> @@ -16,6 +16,7 @@ obj-y				:= entry.o traps.o irq.o idle.o
>  					semaphore.o syscalls.o setup.o \
>  					cputable.o ppc_htab.o perfmon.o
>  obj-$(CONFIG_6xx)		+= l2cr.o cpu_setup_6xx.o
> +obj-$(CONFIG_SOFTWARE_SUSPEND) += swsusp.o
>  obj-$(CONFIG_POWER4)		+= cpu_setup_power4.o
>  obj-$(CONFIG_MODULES)		+= module.o ppc_ksyms.o
>  obj-$(CONFIG_NOT_COHERENT_CACHE)	+= dma-mapping.o
> --- 2.6.10-mm1/arch/ppc/kernel/signal.c	2005-01-03 18:53:25.000000000 +0800
> +++ 2.6.10-mm1-swsusp//arch/ppc/kernel/signal.c	2005-01-03 19:03:39.000000000 +0800
> @@ -28,6 +28,7 @@
>  #include <linux/elf.h>
>  #include <linux/tty.h>
>  #include <linux/binfmts.h>
> +#include <linux/suspend.h>
>  #include <asm/ucontext.h>
>  #include <asm/uaccess.h>
>  #include <asm/pgtable.h>
> @@ -704,6 +705,14 @@ int do_signal(sigset_t *oldset, struct p
>  	unsigned long frame, newsp;
>  	int signr, ret;
>  
> +	if (current->flags & PF_FREEZE) {
> +		refrigerator(PF_FREEZE);
> +		signr = 0;
> +		ret = regs->gpr[3];
> +		if (!signal_pending(current))
> +			goto no_signal;
> +	}
> +
>  	if (!oldset)
>  		oldset = &current->blocked;
>  
> @@ -726,6 +735,7 @@ int do_signal(sigset_t *oldset, struct p
>  			regs->gpr[3] = EINTR;
>  			/* note that the cr0.SO bit is already set */
>  		} else {
> +no_signal:
>  			regs->nip -= 4;	/* Back up & retry system call */
>  			regs->result = 0;
>  			regs->trap = 0;
> --- /dev/null	2004-06-07 18:45:47.000000000 +0800
> +++ 2.6.10-mm1-swsusp//arch/ppc/kernel/swsusp.c	2005-01-03 20:15:06.000000000 +0800
> @@ -0,0 +1,88 @@
> +/*
> + * Written by Hu Gang (hugang@soulinfo.com)
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * as published by the Free Software Foundation; either version
> + * 2 of the License, or (at your option) any later version.
> + */
> +
> +#include <linux/config.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/types.h>
> +#include <linux/spinlock.h>
> +#include <linux/poll.h>
> +#include <linux/delay.h>
> +#include <linux/sysrq.h>
> +#include <linux/proc_fs.h>
> +#include <linux/irq.h>
> +#include <linux/pm.h>
> +#include <linux/adb.h>
> +#include <linux/cuda.h>
> +#include <linux/pmu.h>
> +#include <linux/device.h>
> +#include <linux/suspend.h>
> +#include <asm/mmu_context.h>
> +#include <asm/uaccess.h>
> +#include <asm/suspend.h>
> +
> +#include "cpu_context.h"
> +
> +extern suspend_pagedir_t *pagedir_nosave __nosavedata;
> +extern int nr_copy_pages __nosavedata;
> +
> +extern asmlinkage int swsusp_save(void);
> +
> +static void inline do_swsusp_copyback(void)
> +{
> +	register int i = 0; 
> +	
> +	for (i = 0; i < nr_copy_pages; i++) {
> +		register int loop;
> +		register unsigned long *orig, *copy;
> +		
> +		copy = (unsigned long *)pagedir_nosave[i].address;
> +		orig = (unsigned long *)pagedir_nosave[i].orig_address;
> +		
> +		for (loop = 0; 
> +		     loop < (PAGE_SIZE / sizeof(unsigned long));
> +		     loop ++)
> +			*(orig + loop) = *(copy + loop);
> +	}
> +}
> +
> +static struct saved_context swsusp_saved_context;
> +
> +void save_processor_state(void)
> +{
> +	__save_processor_state(&swsusp_saved_context);
> +}
> +
> +void restore_processor_state(void)
> +{
> +	__restore_processor_state(&swsusp_saved_context);
> +}
> +
> +void __flush_tlb_global(void)
> +{
> +	/* do nothing */
> +}
> +
> +static struct saved_context saved_context;
> +
> +void swsusp_arch_suspend(void)
> +{
> +	save_context();
> +	__save_processor_state(&saved_context);
> +	swsusp_save();
> +}
> +
> +void swsusp_arch_resume(void)
> +{
> +	save_context();
> +	do_swsusp_copyback();
> +	__restore_processor_state(&saved_context);
> +	restore_context();
> +}
> --- /dev/null	2004-06-07 18:45:47.000000000 +0800
> +++ 2.6.10-mm1-swsusp//arch/ppc/kernel/cpu_context.h	2005-01-03 20:16:09.000000000 +0800
> @@ -0,0 +1,89 @@
> +/*
> + * Written by Hu Gang (hugang@soulinfo.com)
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * as published by the Free Software Foundation; either version
> + * 2 of the License, or (at your option) any later version.
> + */
> +
> +void inline __save_processor_state(struct saved_context *s)
> +{
> +	/*asm volatile ("mflr 0; stw 0,%0" : "=m" (s->lr));*/
> +	asm volatile ("mfcr 0; stw 0,%0" : "=m" (s->cr));
> +	asm volatile ("stw 1,%0" : "=m" (s->sp));
> +	asm volatile ("stw 2,%0" : "=m" (s->r2));
> +	asm volatile ("stmw 12,%0" : "=m" (s->r12));
> +
> +	/* Save MSR & SDR1 */
> +	asm volatile ("mfmsr 4; stw 4,%0" : "=m" (s->msr));
> +	asm volatile ("mfsdr1 4; stw 4,%0": "=m" (s->sdr1));
> +
> +	/* Get a stable timebase and save it */
> +	asm volatile ("1:\n"
> +		      "mftbu 4;stw 4,%0\n"
> +		      "mftb  5;stw 5,%1\n"
> +		      "mftbu 3\n"
> +		      "cmpw 3,4;\n"
> +			  "bne 1b" : 
> +			  "=m" (s->tb1),
> +			  "=m" (s->tb2));
> +		
> +	/* Save SPRGs */
> +	asm volatile ("mfsprg 4,0; stw 4,%0 " : "=m" (s->sprg[0]));
> +	asm volatile ("mfsprg 4,1; stw 4,%0 " : "=m" (s->sprg[1]));
> +	asm volatile ("mfsprg 4,2; stw 4,%0 " : "=m" (s->sprg[2]));
> +	asm volatile ("mfsprg 4,3; stw 4,%0 " : "=m" (s->sprg[3]));
> +}
> +
> +void inline __restore_processor_state(struct saved_context *s)
> +{
> +	/* Restore the BATs, and SDR1 */
> +	asm volatile ("lwz 4,%0; mtsdr1 4" : "=m" (s->sdr1));
> +	/* asm volatile ("lwz 3,%0" : "=m" (saved_context.msr)); */
> +
> +	asm volatile ("lwz 4,%0; mtsprg 0,4": "=m" (s->sprg[0]));
> +	asm volatile ("lwz 4,%0; mtsprg 1,4": "=m" (s->sprg[1]));
> +	asm volatile ("lwz 4,%0; mtsprg 2,4": "=m" (s->sprg[2]));
> +	asm volatile ("lwz 4,%0; mtsprg 3,4": "=m" (s->sprg[3]));
> +
> +	/* Restore TB */
> +	asm volatile ("li 3,0; mttbl 3; \n"
> +		      "lwz 3,%0\n; lwz 4,%1\n"
> +		      "mttbu 3; mttbl 4" :
> +		      "=m" (s->tb1),
> +		      "=m" (s->tb2));
> +
> +	/* Restore the callee-saved registers and return */
> +	asm volatile ("lmw 12,%0" : "=m" (s->r12)); 
> +	asm volatile ("lwz 2,%0" : "=m" (s->r2));
> +	asm volatile ("lwz 1,%0" : "=m" (s->sp));
> +	asm volatile ("lwz 0,%0; mtcr 0" : "=m" (s->cr)); 	
> +	/*asm volatile ("lwz 0,%0; mtlr 0" : "=m" (s->lr));*/
> +}
> +
> +static inline void save_context(void)
> +{
> +	pmu_suspend();
> +}
> +
> +extern void enable_kernel_altivec(void);
> +
> +static inline void restore_context(void)
> +{
> +	printk("set context: <%p>\n", current);
> +	set_context(current->active_mm->context,
> +			current->active_mm->pgd);
> +
> +	printk("pmu_resume\n");
> +	pmu_resume();
> +
> +#ifdef CONFIG_ALTIVEC
> +	if (cur_cpu_spec[0]->cpu_features & CPU_FTR_ALTIVEC) {
> +		printk("enable altivec\n");
> +		enable_kernel_altivec();
> +	}
> +#endif
> +	printk("enable fp\n");
> +	enable_kernel_fp();
> +}
> --- 2.6.10-mm1/arch/ppc/kernel/vmlinux.lds.S	2004-12-30 14:55:39.000000000 +0800
> +++ 2.6.10-mm1-swsusp//arch/ppc/kernel/vmlinux.lds.S	2005-01-03 19:04:05.000000000 +0800
> @@ -74,6 +74,12 @@ SECTIONS
>      CONSTRUCTORS
>    }
>  
> +  . = ALIGN(4096);
> +  __nosave_begin = .;
> +  .data_nosave : { *(.data.nosave) }
> +  . = ALIGN(4096);
> +  __nosave_end = .;
> +
>    . = ALIGN(32);
>    .data.cacheline_aligned : { *(.data.cacheline_aligned) }
>  
> --- /dev/null	2004-06-07 18:45:47.000000000 +0800
> +++ 2.6.10-mm1-swsusp//include/asm-ppc/suspend.h	2005-01-03 19:35:02.000000000 +0800
> @@ -0,0 +1,28 @@
> +/*
> + * Written by Hu Gang (hugang@soulinfo.com)
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * as published by the Free Software Foundation; either version
> + * 2 of the License, or (at your option) any later version.
> + */
> +
> +#ifndef _ASM_PPC_SUSPEND_H_
> +#define _ASM_PPC_SUSPEND_H_
> +
> +static inline int
> +arch_prepare_suspend(void)
> +{
> +
> +	return 0;
> +}
> +
> +/* image of the saved processor states */
> +struct saved_context {
> +	u32 lr, cr, sp, r2;
> +	u64 r12;
> +	u32 sprg[4];
> +	u32 msr, sdr1, tb1, tb2;
> +} __attribute__((packed));
> +
> +#endif
> --- 2.6.10-mm1/include/linux/suspend.h	2005-01-03 18:53:51.000000000 +0800
> +++ 2.6.10-mm1-swsusp//include/linux/suspend.h	2005-01-03 19:32:29.000000000 +0800
> @@ -1,7 +1,7 @@
>  #ifndef _LINUX_SWSUSP_H
>  #define _LINUX_SWSUSP_H
>  
> -#if defined(CONFIG_X86) || defined(CONFIG_FRV)
> +#if defined(CONFIG_X86) || defined(CONFIG_FRV) || defined(CONFIG_PPC32)
>  #include <asm/suspend.h>
>  #endif
>  #include <linux/swap.h>
> -- 
> Hu Gang       .-.
>               /v\
>              // \\ 
> Linux User  /(   )\  [204016]
> GPG Key ID   ^^-^^   http://soulinfo.com/~hugang/hugang.asc
> 
> ----- End forwarded message -----
-- 
Nigel Cunningham
Software Engineer, Canberra, Australia
http://www.cyclades.com

Ph: +61 (2) 6292 8028      Mob: +61 (417) 100 574