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authorPaul Mackerras <paulus@samba.org>2006-03-26 23:03:03 -0500
committerPaul Mackerras <paulus@samba.org>2006-03-26 23:03:03 -0500
commita0652fc9a28c3ef8cd59264bfcb089c44d1b0e06 (patch)
treea28527b65237b3067553a993f5ad06dfb24df044 /arch/powerpc
parent55aab8cd3a498201b769a19de861c77516bdfd45 (diff)
powerpc: Unify the 32 and 64 bit idle loops
This unifies the 32-bit (ARCH=ppc and ARCH=powerpc) and 64-bit idle loops. It brings over the concept of having a ppc_md.power_save function from 32-bit to ARCH=powerpc, which lets us get rid of native_idle(). With this we will also be able to simplify the idle handling for pSeries and cell. Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kernel/Makefile6
-rw-r--r--arch/powerpc/kernel/entry_32.S8
-rw-r--r--arch/powerpc/kernel/idle.c (renamed from arch/powerpc/kernel/idle_64.c)79
-rw-r--r--arch/powerpc/kernel/idle_6xx.S15
-rw-r--r--arch/powerpc/kernel/idle_power4.S15
-rw-r--r--arch/powerpc/kernel/setup_32.c7
-rw-r--r--arch/powerpc/kernel/setup_64.c6
-rw-r--r--arch/powerpc/platforms/maple/setup.c2
-rw-r--r--arch/powerpc/platforms/powermac/setup.c2
9 files changed, 54 insertions, 86 deletions
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 80e9fe2632b8..f2c47e907037 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -12,12 +12,12 @@ endif
12 12
13obj-y := semaphore.o cputable.o ptrace.o syscalls.o \ 13obj-y := semaphore.o cputable.o ptrace.o syscalls.o \
14 irq.o align.o signal_32.o pmc.o vdso.o \ 14 irq.o align.o signal_32.o pmc.o vdso.o \
15 init_task.o process.o systbl.o 15 init_task.o process.o systbl.o idle.o
16obj-y += vdso32/ 16obj-y += vdso32/
17obj-$(CONFIG_PPC64) += setup_64.o binfmt_elf32.o sys_ppc32.o \ 17obj-$(CONFIG_PPC64) += setup_64.o binfmt_elf32.o sys_ppc32.o \
18 signal_64.o ptrace32.o \ 18 signal_64.o ptrace32.o \
19 paca.o cpu_setup_power4.o \ 19 paca.o cpu_setup_power4.o \
20 firmware.o sysfs.o idle_64.o 20 firmware.o sysfs.o
21obj-$(CONFIG_PPC64) += vdso64/ 21obj-$(CONFIG_PPC64) += vdso64/
22obj-$(CONFIG_ALTIVEC) += vecemu.o vector.o 22obj-$(CONFIG_ALTIVEC) += vecemu.o vector.o
23obj-$(CONFIG_POWER4) += idle_power4.o 23obj-$(CONFIG_POWER4) += idle_power4.o
@@ -34,6 +34,7 @@ obj-$(CONFIG_IBMEBUS) += ibmebus.o
34obj-$(CONFIG_GENERIC_TBSYNC) += smp-tbsync.o 34obj-$(CONFIG_GENERIC_TBSYNC) += smp-tbsync.o
35obj64-$(CONFIG_PPC_MULTIPLATFORM) += nvram_64.o 35obj64-$(CONFIG_PPC_MULTIPLATFORM) += nvram_64.o
36obj-$(CONFIG_CRASH_DUMP) += crash_dump.o 36obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
37obj-$(CONFIG_6xx) += idle_6xx.o
37 38
38ifeq ($(CONFIG_PPC_MERGE),y) 39ifeq ($(CONFIG_PPC_MERGE),y)
39 40
@@ -51,7 +52,6 @@ obj-$(CONFIG_PPC64) += misc_64.o dma_64.o iommu.o
51obj-$(CONFIG_PPC_MULTIPLATFORM) += prom_init.o 52obj-$(CONFIG_PPC_MULTIPLATFORM) += prom_init.o
52obj-$(CONFIG_MODULES) += ppc_ksyms.o 53obj-$(CONFIG_MODULES) += ppc_ksyms.o
53obj-$(CONFIG_BOOTX_TEXT) += btext.o 54obj-$(CONFIG_BOOTX_TEXT) += btext.o
54obj-$(CONFIG_6xx) += idle_6xx.o
55obj-$(CONFIG_SMP) += smp.o 55obj-$(CONFIG_SMP) += smp.o
56obj-$(CONFIG_KPROBES) += kprobes.o 56obj-$(CONFIG_KPROBES) += kprobes.o
57obj-$(CONFIG_PPC_UDBG_16550) += legacy_serial.o udbg_16550.o 57obj-$(CONFIG_PPC_UDBG_16550) += legacy_serial.o udbg_16550.o
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 4827ca1ec89b..b3a979467225 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -135,10 +135,10 @@ transfer_to_handler:
135 mfspr r11,SPRN_HID0 135 mfspr r11,SPRN_HID0
136 mtcr r11 136 mtcr r11
137BEGIN_FTR_SECTION 137BEGIN_FTR_SECTION
138 bt- 8,power_save_6xx_restore /* Check DOZE */ 138 bt- 8,4f /* Check DOZE */
139END_FTR_SECTION_IFSET(CPU_FTR_CAN_DOZE) 139END_FTR_SECTION_IFSET(CPU_FTR_CAN_DOZE)
140BEGIN_FTR_SECTION 140BEGIN_FTR_SECTION
141 bt- 9,power_save_6xx_restore /* Check NAP */ 141 bt- 9,4f /* Check NAP */
142END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP) 142END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
143#endif /* CONFIG_6xx */ 143#endif /* CONFIG_6xx */
144 .globl transfer_to_handler_cont 144 .globl transfer_to_handler_cont
@@ -157,6 +157,10 @@ transfer_to_handler_cont:
157 SYNC 157 SYNC
158 RFI /* jump to handler, enable MMU */ 158 RFI /* jump to handler, enable MMU */
159 159
160#ifdef CONFIG_6xx
1614: b power_save_6xx_restore
162#endif
163
160/* 164/*
161 * On kernel stack overflow, load up an initial stack pointer 165 * On kernel stack overflow, load up an initial stack pointer
162 * and call StackOverflow(regs), which should not return. 166 * and call StackOverflow(regs), which should not return.
diff --git a/arch/powerpc/kernel/idle_64.c b/arch/powerpc/kernel/idle.c
index b879d3057ef8..e9f321d74d85 100644
--- a/arch/powerpc/kernel/idle_64.c
+++ b/arch/powerpc/kernel/idle.c
@@ -2,13 +2,17 @@
2 * Idle daemon for PowerPC. Idle daemon will handle any action 2 * Idle daemon for PowerPC. Idle daemon will handle any action
3 * that needs to be taken when the system becomes idle. 3 * that needs to be taken when the system becomes idle.
4 * 4 *
5 * Originally Written by Cort Dougan (cort@cs.nmt.edu) 5 * Originally written by Cort Dougan (cort@cs.nmt.edu).
6 * Subsequent 32-bit hacking by Tom Rini, Armin Kuster,
7 * Paul Mackerras and others.
6 * 8 *
7 * iSeries supported added by Mike Corrigan <mikejc@us.ibm.com> 9 * iSeries supported added by Mike Corrigan <mikejc@us.ibm.com>
8 * 10 *
9 * Additional shared processor, SMT, and firmware support 11 * Additional shared processor, SMT, and firmware support
10 * Copyright (c) 2003 Dave Engebretsen <engebret@us.ibm.com> 12 * Copyright (c) 2003 Dave Engebretsen <engebret@us.ibm.com>
11 * 13 *
14 * 32-bit and 64-bit versions merged by Paul Mackerras <paulus@samba.org>
15 *
12 * This program is free software; you can redistribute it and/or 16 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License 17 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 18 * as published by the Free Software Foundation; either version
@@ -29,18 +33,43 @@
29#include <asm/machdep.h> 33#include <asm/machdep.h>
30#include <asm/smp.h> 34#include <asm/smp.h>
31 35
32extern void power4_idle(void); 36#ifdef CONFIG_HOTPLUG_CPU
37#define cpu_should_die() (cpu_is_offline(smp_processor_id()) && \
38 system_state == SYSTEM_RUNNING)
39#else
40#define cpu_should_die() 0
41#endif
33 42
34void default_idle(void) 43/*
44 * The body of the idle task.
45 */
46void cpu_idle(void)
35{ 47{
36 unsigned int cpu = smp_processor_id(); 48 if (ppc_md.idle_loop)
37 set_thread_flag(TIF_POLLING_NRFLAG); 49 ppc_md.idle_loop(); /* doesn't return */
38 50
51 set_thread_flag(TIF_POLLING_NRFLAG);
39 while (1) { 52 while (1) {
40 if (!need_resched()) { 53 ppc64_runlatch_off();
41 while (!need_resched() && !cpu_is_offline(cpu)) {
42 ppc64_runlatch_off();
43 54
55 while (!need_resched() && !cpu_should_die()) {
56 if (ppc_md.power_save) {
57 clear_thread_flag(TIF_POLLING_NRFLAG);
58 /*
59 * smp_mb is so clearing of TIF_POLLING_NRFLAG
60 * is ordered w.r.t. need_resched() test.
61 */
62 smp_mb();
63 local_irq_disable();
64
65 /* check again after disabling irqs */
66 if (!need_resched() && !cpu_should_die())
67 ppc_md.power_save();
68
69 local_irq_enable();
70 set_thread_flag(TIF_POLLING_NRFLAG);
71
72 } else {
44 /* 73 /*
45 * Go into low thread priority and possibly 74 * Go into low thread priority and possibly
46 * low power mode. 75 * low power mode.
@@ -48,46 +77,18 @@ void default_idle(void)
48 HMT_low(); 77 HMT_low();
49 HMT_very_low(); 78 HMT_very_low();
50 } 79 }
51
52 HMT_medium();
53 } 80 }
54 81
82 HMT_medium();
55 ppc64_runlatch_on(); 83 ppc64_runlatch_on();
84 if (cpu_should_die())
85 cpu_die();
56 preempt_enable_no_resched(); 86 preempt_enable_no_resched();
57 schedule(); 87 schedule();
58 preempt_disable(); 88 preempt_disable();
59 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
60 cpu_die();
61 } 89 }
62} 90}
63 91
64void native_idle(void)
65{
66 while (1) {
67 ppc64_runlatch_off();
68
69 if (!need_resched())
70 power4_idle();
71
72 if (need_resched()) {
73 ppc64_runlatch_on();
74 preempt_enable_no_resched();
75 schedule();
76 preempt_disable();
77 }
78
79 if (cpu_is_offline(smp_processor_id()) &&
80 system_state == SYSTEM_RUNNING)
81 cpu_die();
82 }
83}
84
85void cpu_idle(void)
86{
87 BUG_ON(NULL == ppc_md.idle_loop);
88 ppc_md.idle_loop();
89}
90
91int powersave_nap; 92int powersave_nap;
92 93
93#ifdef CONFIG_SYSCTL 94#ifdef CONFIG_SYSCTL
diff --git a/arch/powerpc/kernel/idle_6xx.S b/arch/powerpc/kernel/idle_6xx.S
index 444fdcc769f1..1647ea361ef7 100644
--- a/arch/powerpc/kernel/idle_6xx.S
+++ b/arch/powerpc/kernel/idle_6xx.S
@@ -87,19 +87,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
87 cmpwi 0,r3,0 87 cmpwi 0,r3,0
88 beqlr 88 beqlr
89 89
90 /* Clear MSR:EE */
91 mfmsr r7
92 rlwinm r0,r7,0,17,15
93 mtmsr r0
94
95 /* Check current_thread_info()->flags */
96 rlwinm r4,r1,0,0,18
97 lwz r4,TI_FLAGS(r4)
98 andi. r0,r4,_TIF_NEED_RESCHED
99 beq 1f
100 mtmsr r7 /* out of line this ? */
101 blr
1021:
103 /* Some pre-nap cleanups needed on some CPUs */ 90 /* Some pre-nap cleanups needed on some CPUs */
104 andis. r0,r3,HID0_NAP@h 91 andis. r0,r3,HID0_NAP@h
105 beq 2f 92 beq 2f
@@ -220,8 +207,6 @@ _GLOBAL(nap_save_msscr0)
220_GLOBAL(nap_save_hid1) 207_GLOBAL(nap_save_hid1)
221 .space 4*NR_CPUS 208 .space 4*NR_CPUS
222 209
223_GLOBAL(powersave_nap)
224 .long 0
225_GLOBAL(powersave_lowspeed) 210_GLOBAL(powersave_lowspeed)
226 .long 0 211 .long 0
227 212
diff --git a/arch/powerpc/kernel/idle_power4.S b/arch/powerpc/kernel/idle_power4.S
index c16b4afab582..692cf2ebe0f4 100644
--- a/arch/powerpc/kernel/idle_power4.S
+++ b/arch/powerpc/kernel/idle_power4.S
@@ -49,21 +49,6 @@ END_FTR_SECTION_IFCLR(CPU_FTR_CAN_NAP)
49 cmpwi 0,r4,0 49 cmpwi 0,r4,0
50 beqlr 50 beqlr
51 51
52 /* Clear MSR:EE */
53 mfmsr r7
54 li r4,0
55 ori r4,r4,MSR_EE
56 andc r0,r7,r4
57 mtmsrd r0
58
59 /* Check current_thread_info()->flags */
60 clrrdi r4,r1,THREAD_SHIFT
61 ld r4,TI_FLAGS(r4)
62 andi. r0,r4,_TIF_NEED_RESCHED
63 beq 1f
64 mtmsrd r7 /* out of line this ? */
65 blr
661:
67 /* Go to NAP now */ 52 /* Go to NAP now */
68BEGIN_FTR_SECTION 53BEGIN_FTR_SECTION
69 DSSALL 54 DSSALL
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index 676f894c3380..e39f830317a8 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -53,9 +53,6 @@
53extern void platform_init(void); 53extern void platform_init(void);
54extern void bootx_init(unsigned long r4, unsigned long phys); 54extern void bootx_init(unsigned long r4, unsigned long phys);
55 55
56extern void ppc6xx_idle(void);
57extern void power4_idle(void);
58
59boot_infos_t *boot_infos; 56boot_infos_t *boot_infos;
60struct ide_machdep_calls ppc_ide_md; 57struct ide_machdep_calls ppc_ide_md;
61 58
@@ -194,7 +191,9 @@ void __init machine_init(unsigned long dt_ptr, unsigned long phys)
194 platform_init(); 191 platform_init();
195 192
196#ifdef CONFIG_6xx 193#ifdef CONFIG_6xx
197 ppc_md.power_save = ppc6xx_idle; 194 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
195 cpu_has_feature(CPU_FTR_CAN_NAP))
196 ppc_md.power_save = ppc6xx_idle;
198#endif 197#endif
199 198
200 if (ppc_md.progress) 199 if (ppc_md.progress)
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 6c9b093c23a5..5b63a861ef43 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -607,12 +607,6 @@ void __init setup_arch(char **cmdline_p)
607 607
608 ppc_md.setup_arch(); 608 ppc_md.setup_arch();
609 609
610 /* Use the default idle loop if the platform hasn't provided one. */
611 if (NULL == ppc_md.idle_loop) {
612 ppc_md.idle_loop = default_idle;
613 printk(KERN_INFO "Using default idle loop\n");
614 }
615
616 paging_init(); 610 paging_init();
617 ppc64_boot_msg(0x15, "Setup Done"); 611 ppc64_boot_msg(0x15, "Setup Done");
618} 612}
diff --git a/arch/powerpc/platforms/maple/setup.c b/arch/powerpc/platforms/maple/setup.c
index ec5c1e10c407..137d6063182b 100644
--- a/arch/powerpc/platforms/maple/setup.c
+++ b/arch/powerpc/platforms/maple/setup.c
@@ -290,7 +290,7 @@ struct machdep_calls __initdata maple_md = {
290 .get_rtc_time = maple_get_rtc_time, 290 .get_rtc_time = maple_get_rtc_time,
291 .calibrate_decr = generic_calibrate_decr, 291 .calibrate_decr = generic_calibrate_decr,
292 .progress = maple_progress, 292 .progress = maple_progress,
293 .idle_loop = native_idle, 293 .power_save = power4_idle,
294#ifdef CONFIG_KEXEC 294#ifdef CONFIG_KEXEC
295 .machine_kexec = default_machine_kexec, 295 .machine_kexec = default_machine_kexec,
296 .machine_kexec_prepare = default_machine_kexec_prepare, 296 .machine_kexec_prepare = default_machine_kexec_prepare,
diff --git a/arch/powerpc/platforms/powermac/setup.c b/arch/powerpc/platforms/powermac/setup.c
index 385aab90c4d2..c2696d00672a 100644
--- a/arch/powerpc/platforms/powermac/setup.c
+++ b/arch/powerpc/platforms/powermac/setup.c
@@ -733,7 +733,7 @@ struct machdep_calls __initdata pmac_md = {
733 .progress = udbg_progress, 733 .progress = udbg_progress,
734#ifdef CONFIG_PPC64 734#ifdef CONFIG_PPC64
735 .pci_probe_mode = pmac_pci_probe_mode, 735 .pci_probe_mode = pmac_pci_probe_mode,
736 .idle_loop = native_idle, 736 .power_save = power4_idle,
737 .enable_pmcs = power4_enable_pmcs, 737 .enable_pmcs = power4_enable_pmcs,
738#ifdef CONFIG_KEXEC 738#ifdef CONFIG_KEXEC
739 .machine_kexec = default_machine_kexec, 739 .machine_kexec = default_machine_kexec,