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authorAnton Blanchard <anton@samba.org>2005-06-02 17:02:02 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-02 18:12:30 -0400
commit6dc2f0c7df6cefda5932ac8bcd9ca5ef45de36ee (patch)
treece3f5ba4f99adfbc7adf4242d5bc76a8d0c3fd69 /arch/ppc64/kernel
parent79f1248962cfa1e11a5610e0349bc3515687516d (diff)
[PATCH] ppc64: cleanup iseries runlight support
The iseries has a bar graph on the front panel that shows how busy it is. The operating system sets and clears a bit in the CTRL register to control it. Instead of going to the complexity of using a thread info bit, just set and clear it in the idle loop. Also create two helper functions, ppc64_runlatch_on and ppc64_runlatch_off. Finally don't use the short form of the SPR defines. Signed-off-by: Anton Blanchard <anton@samba.org> Acked-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/ppc64/kernel')
-rw-r--r--arch/ppc64/kernel/entry.S9
-rw-r--r--arch/ppc64/kernel/head.S10
-rw-r--r--arch/ppc64/kernel/idle.c8
-rw-r--r--arch/ppc64/kernel/process.c3
-rw-r--r--arch/ppc64/kernel/sysfs.c8
5 files changed, 10 insertions, 28 deletions
diff --git a/arch/ppc64/kernel/entry.S b/arch/ppc64/kernel/entry.S
index d3604056e1a9..b61572eb2a71 100644
--- a/arch/ppc64/kernel/entry.S
+++ b/arch/ppc64/kernel/entry.S
@@ -436,15 +436,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
436 REST_8GPRS(14, r1) 436 REST_8GPRS(14, r1)
437 REST_10GPRS(22, r1) 437 REST_10GPRS(22, r1)
438 438
439#ifdef CONFIG_PPC_ISERIES
440 clrrdi r7,r1,THREAD_SHIFT /* get current_thread_info() */
441 ld r7,TI_FLAGS(r7) /* Get run light flag */
442 mfspr r9,CTRLF
443 srdi r7,r7,TIF_RUN_LIGHT
444 insrdi r9,r7,1,63 /* Insert run light into CTRL */
445 mtspr CTRLT,r9
446#endif
447
448 /* convert old thread to its task_struct for return value */ 439 /* convert old thread to its task_struct for return value */
449 addi r3,r3,-THREAD 440 addi r3,r3,-THREAD
450 ld r7,_NIP(r1) /* Return to _switch caller in new task */ 441 ld r7,_NIP(r1) /* Return to _switch caller in new task */
diff --git a/arch/ppc64/kernel/head.S b/arch/ppc64/kernel/head.S
index 92a744c31ab1..346dbf606b5d 100644
--- a/arch/ppc64/kernel/head.S
+++ b/arch/ppc64/kernel/head.S
@@ -626,10 +626,10 @@ system_reset_iSeries:
626 lhz r24,PACAPACAINDEX(r13) /* Get processor # */ 626 lhz r24,PACAPACAINDEX(r13) /* Get processor # */
627 cmpwi 0,r24,0 /* Are we processor 0? */ 627 cmpwi 0,r24,0 /* Are we processor 0? */
628 beq .__start_initialization_iSeries /* Start up the first processor */ 628 beq .__start_initialization_iSeries /* Start up the first processor */
629 mfspr r4,CTRLF 629 mfspr r4,SPRN_CTRLF
630 li r5,RUNLATCH /* Turn off the run light */ 630 li r5,CTRL_RUNLATCH /* Turn off the run light */
631 andc r4,r4,r5 631 andc r4,r4,r5
632 mtspr CTRLT,r4 632 mtspr SPRN_CTRLT,r4
633 633
6341: 6341:
635 HMT_LOW 635 HMT_LOW
@@ -2082,9 +2082,9 @@ _GLOBAL(hmt_start_secondary)
2082 mfspr r4, HID0 2082 mfspr r4, HID0
2083 ori r4, r4, 0x1 2083 ori r4, r4, 0x1
2084 mtspr HID0, r4 2084 mtspr HID0, r4
2085 mfspr r4, CTRLF 2085 mfspr r4, SPRN_CTRLF
2086 oris r4, r4, 0x40 2086 oris r4, r4, 0x40
2087 mtspr CTRLT, r4 2087 mtspr SPRN_CTRLT, r4
2088 blr 2088 blr
2089#endif 2089#endif
2090 2090
diff --git a/arch/ppc64/kernel/idle.c b/arch/ppc64/kernel/idle.c
index 6abc621d3ba0..f24ce2b87200 100644
--- a/arch/ppc64/kernel/idle.c
+++ b/arch/ppc64/kernel/idle.c
@@ -75,13 +75,9 @@ static int iSeries_idle(void)
75{ 75{
76 struct paca_struct *lpaca; 76 struct paca_struct *lpaca;
77 long oldval; 77 long oldval;
78 unsigned long CTRL;
79 78
80 /* ensure iSeries run light will be out when idle */ 79 /* ensure iSeries run light will be out when idle */
81 clear_thread_flag(TIF_RUN_LIGHT); 80 ppc64_runlatch_off();
82 CTRL = mfspr(CTRLF);
83 CTRL &= ~RUNLATCH;
84 mtspr(CTRLT, CTRL);
85 81
86 lpaca = get_paca(); 82 lpaca = get_paca();
87 83
@@ -111,7 +107,9 @@ static int iSeries_idle(void)
111 } 107 }
112 } 108 }
113 109
110 ppc64_runlatch_on();
114 schedule(); 111 schedule();
112 ppc64_runlatch_off();
115 } 113 }
116 114
117 return 0; 115 return 0;
diff --git a/arch/ppc64/kernel/process.c b/arch/ppc64/kernel/process.c
index 8b0686122738..cdfecbeb331f 100644
--- a/arch/ppc64/kernel/process.c
+++ b/arch/ppc64/kernel/process.c
@@ -378,9 +378,6 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
378 childregs->gpr[1] = sp + sizeof(struct pt_regs); 378 childregs->gpr[1] = sp + sizeof(struct pt_regs);
379 p->thread.regs = NULL; /* no user register state */ 379 p->thread.regs = NULL; /* no user register state */
380 clear_ti_thread_flag(p->thread_info, TIF_32BIT); 380 clear_ti_thread_flag(p->thread_info, TIF_32BIT);
381#ifdef CONFIG_PPC_ISERIES
382 set_ti_thread_flag(p->thread_info, TIF_RUN_LIGHT);
383#endif
384 } else { 381 } else {
385 childregs->gpr[1] = usp; 382 childregs->gpr[1] = usp;
386 p->thread.regs = childregs; 383 p->thread.regs = childregs;
diff --git a/arch/ppc64/kernel/sysfs.c b/arch/ppc64/kernel/sysfs.c
index 0925694c3ce5..c8fa6569b2fd 100644
--- a/arch/ppc64/kernel/sysfs.c
+++ b/arch/ppc64/kernel/sysfs.c
@@ -113,7 +113,6 @@ void ppc64_enable_pmcs(void)
113#ifdef CONFIG_PPC_PSERIES 113#ifdef CONFIG_PPC_PSERIES
114 unsigned long set, reset; 114 unsigned long set, reset;
115 int ret; 115 int ret;
116 unsigned int ctrl;
117#endif /* CONFIG_PPC_PSERIES */ 116#endif /* CONFIG_PPC_PSERIES */
118 117
119 /* Only need to enable them once */ 118 /* Only need to enable them once */
@@ -167,11 +166,8 @@ void ppc64_enable_pmcs(void)
167 * On SMT machines we have to set the run latch in the ctrl register 166 * On SMT machines we have to set the run latch in the ctrl register
168 * in order to make PMC6 spin. 167 * in order to make PMC6 spin.
169 */ 168 */
170 if (cpu_has_feature(CPU_FTR_SMT)) { 169 if (cpu_has_feature(CPU_FTR_SMT))
171 ctrl = mfspr(CTRLF); 170 ppc64_runlatch_on();
172 ctrl |= RUNLATCH;
173 mtspr(CTRLT, ctrl);
174 }
175#endif /* CONFIG_PPC_PSERIES */ 171#endif /* CONFIG_PPC_PSERIES */
176} 172}
177 173