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| author | Christian Krafft <krafft@de.ibm.com> | 2007-07-20 23:39:19 +0400 |
|---|---|---|
| committer | Arnd Bergmann <arnd@klappe.arndb.de> | 2007-07-20 23:41:35 +0400 |
| commit | a964b9be3e475f30aee334654b4ff200bcdc0092 (patch) | |
| tree | b360230a33572e0e4209bd43bd1266d4f20cd40c /arch | |
| parent | 813f90728e7d74e9b753e6ef6c6915cd2a047adb (diff) | |
| download | linux-a964b9be3e475f30aee334654b4ff200bcdc0092.tar.xz | |
[CELL] cbe_cpufreq: fix latency measurement
This patch fixes the debug code that calculates the transition time when
changing the slow modes on a Cell BE cpu.
Signed-off-by: Christian Krafft <krafft@de.ibm.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/platforms/cell/cbe_cpufreq.c | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/arch/powerpc/platforms/cell/cbe_cpufreq.c b/arch/powerpc/platforms/cell/cbe_cpufreq.c index 3586f5290490..5820fb9a4521 100644 --- a/arch/powerpc/platforms/cell/cbe_cpufreq.c +++ b/arch/powerpc/platforms/cell/cbe_cpufreq.c @@ -81,7 +81,7 @@ static int set_pmode_pmi(int cpu, unsigned int pmode) int ret; pmi_message_t pmi_msg; #ifdef DEBUG - u64 time; + long time; #endif pmi_msg.type = PMI_TYPE_FREQ_CHANGE; @@ -89,7 +89,7 @@ static int set_pmode_pmi(int cpu, unsigned int pmode) pmi_msg.data2 = pmode; #ifdef DEBUG - time = (u64) get_cycles(); + time = jiffies; #endif pmi_send_message(pmi_msg); @@ -98,9 +98,9 @@ static int set_pmode_pmi(int cpu, unsigned int pmode) pr_debug("PMI returned slow mode %d\n", ret); #ifdef DEBUG - time = (u64) get_cycles() - time; /* actual cycles (not cpu cycles!) */ - time = 1000000000 * time / CLOCK_TICK_RATE; /* time in ns (10^-9) */ - pr_debug("had to wait %lu ns for a transition\n", time); + time = jiffies - time; /* actual cycles (not cpu cycles!) */ + time = jiffies_to_msecs(time); + pr_debug("had to wait %lu ms for a transition using PMI.\n", time); #endif return ret; } @@ -123,15 +123,18 @@ static int set_pmode_reg(int cpu, unsigned int pmode) struct cbe_mic_tm_regs __iomem *mic_tm_regs; u64 flags; u64 value; +#ifdef DEBUG + long time; +#endif local_irq_save(flags); mic_tm_regs = cbe_get_cpu_mic_tm_regs(cpu); pmd_regs = cbe_get_cpu_pmd_regs(cpu); - pr_debug("pm register is mapped at %p\n", &pmd_regs->pmcr); - pr_debug("mic register is mapped at %p\n", &mic_tm_regs->slow_fast_timer_0); - +#ifdef DEBUG + time = jiffies; +#endif out_be64(&mic_tm_regs->slow_fast_timer_0, MIC_Slow_Fast_Timer_table[pmode]); out_be64(&mic_tm_regs->slow_fast_timer_1, MIC_Slow_Fast_Timer_table[pmode]); @@ -146,6 +149,7 @@ static int set_pmode_reg(int cpu, unsigned int pmode) out_be64(&pmd_regs->pmcr, value); +#ifdef DEBUG /* wait until new pmode appears in status register */ value = in_be64(&pmd_regs->pmsr) & 0x07; while(value != pmode) { @@ -153,6 +157,11 @@ static int set_pmode_reg(int cpu, unsigned int pmode) value = in_be64(&pmd_regs->pmsr) & 0x07; } + time = jiffies - time; + time = jiffies_to_msecs(time); + pr_debug("had to wait %lu ms for a transition using " \ + "the pervasive unit.\n", time); +#endif local_irq_restore(flags); return 0; |