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authorAnton Blanchard <anton@samba.org>2005-06-02 14:02:02 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-02 15:12:30 -0700
commit6dc2f0c7df6cefda5932ac8bcd9ca5ef45de36ee (patch)
treece3f5ba4f99adfbc7adf4242d5bc76a8d0c3fd69 /arch/ppc64
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')
-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 d3604056e1a..b61572eb2a7 100644
--- a/arch/ppc64/kernel/entry.S
+++ b/arch/ppc64/kernel/entry.S
@@ -436,15 +436,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
REST_8GPRS(14, r1)
REST_10GPRS(22, r1)
-#ifdef CONFIG_PPC_ISERIES
- clrrdi r7,r1,THREAD_SHIFT /* get current_thread_info() */
- ld r7,TI_FLAGS(r7) /* Get run light flag */
- mfspr r9,CTRLF
- srdi r7,r7,TIF_RUN_LIGHT
- insrdi r9,r7,1,63 /* Insert run light into CTRL */
- mtspr CTRLT,r9
-#endif
-
/* convert old thread to its task_struct for return value */
addi r3,r3,-THREAD
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 92a744c31ab..346dbf606b5 100644
--- a/arch/ppc64/kernel/head.S
+++ b/arch/ppc64/kernel/head.S
@@ -626,10 +626,10 @@ system_reset_iSeries:
lhz r24,PACAPACAINDEX(r13) /* Get processor # */
cmpwi 0,r24,0 /* Are we processor 0? */
beq .__start_initialization_iSeries /* Start up the first processor */
- mfspr r4,CTRLF
- li r5,RUNLATCH /* Turn off the run light */
+ mfspr r4,SPRN_CTRLF
+ li r5,CTRL_RUNLATCH /* Turn off the run light */
andc r4,r4,r5
- mtspr CTRLT,r4
+ mtspr SPRN_CTRLT,r4
1:
HMT_LOW
@@ -2082,9 +2082,9 @@ _GLOBAL(hmt_start_secondary)
mfspr r4, HID0
ori r4, r4, 0x1
mtspr HID0, r4
- mfspr r4, CTRLF
+ mfspr r4, SPRN_CTRLF
oris r4, r4, 0x40
- mtspr CTRLT, r4
+ mtspr SPRN_CTRLT, r4
blr
#endif
diff --git a/arch/ppc64/kernel/idle.c b/arch/ppc64/kernel/idle.c
index 6abc621d3ba..f24ce2b8720 100644
--- a/arch/ppc64/kernel/idle.c
+++ b/arch/ppc64/kernel/idle.c
@@ -75,13 +75,9 @@ static int iSeries_idle(void)
{
struct paca_struct *lpaca;
long oldval;
- unsigned long CTRL;
/* ensure iSeries run light will be out when idle */
- clear_thread_flag(TIF_RUN_LIGHT);
- CTRL = mfspr(CTRLF);
- CTRL &= ~RUNLATCH;
- mtspr(CTRLT, CTRL);
+ ppc64_runlatch_off();
lpaca = get_paca();
@@ -111,7 +107,9 @@ static int iSeries_idle(void)
}
}
+ ppc64_runlatch_on();
schedule();
+ ppc64_runlatch_off();
}
return 0;
diff --git a/arch/ppc64/kernel/process.c b/arch/ppc64/kernel/process.c
index 8b068612273..cdfecbeb331 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,
childregs->gpr[1] = sp + sizeof(struct pt_regs);
p->thread.regs = NULL; /* no user register state */
clear_ti_thread_flag(p->thread_info, TIF_32BIT);
-#ifdef CONFIG_PPC_ISERIES
- set_ti_thread_flag(p->thread_info, TIF_RUN_LIGHT);
-#endif
} else {
childregs->gpr[1] = usp;
p->thread.regs = childregs;
diff --git a/arch/ppc64/kernel/sysfs.c b/arch/ppc64/kernel/sysfs.c
index 0925694c3ce..c8fa6569b2f 100644
--- a/arch/ppc64/kernel/sysfs.c
+++ b/arch/ppc64/kernel/sysfs.c
@@ -113,7 +113,6 @@ void ppc64_enable_pmcs(void)
#ifdef CONFIG_PPC_PSERIES
unsigned long set, reset;
int ret;
- unsigned int ctrl;
#endif /* CONFIG_PPC_PSERIES */
/* Only need to enable them once */
@@ -167,11 +166,8 @@ void ppc64_enable_pmcs(void)
* On SMT machines we have to set the run latch in the ctrl register
* in order to make PMC6 spin.
*/
- if (cpu_has_feature(CPU_FTR_SMT)) {
- ctrl = mfspr(CTRLF);
- ctrl |= RUNLATCH;
- mtspr(CTRLT, ctrl);
- }
+ if (cpu_has_feature(CPU_FTR_SMT))
+ ppc64_runlatch_on();
#endif /* CONFIG_PPC_PSERIES */
}