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

hugang
2005-01-03T12:32:06Z

----- 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>
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Hu Gang .-.
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