Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422799AbXBALNA (ORCPT ); Thu, 1 Feb 2007 06:13:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1422798AbXBALMk (ORCPT ); Thu, 1 Feb 2007 06:12:40 -0500 Received: from styx.suse.cz ([82.119.242.94]:53744 "EHLO mail.suse.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751736AbXBALMe (ORCPT ); Thu, 1 Feb 2007 06:12:34 -0500 Message-Id: <20070201103753.508377000@jet.suse.cz> References: <20070201095952.589234000@jet.suse.cz> User-Agent: quilt/0.44-16.5 Date: Thu, 01 Feb 2007 10:59:54 +0100 From: jbohac@suse.cz To: Andi Kleen Cc: linux-kernel@vger.kernel.org, Jiri Bohac , Vojtech Pavlik , ssouhlal@freebsd.org, arjan@infradead.org, tglx@linutronix.de, johnstul@us.ibm.com, zippel@linux-m68k.org, andrea@suse.de Subject: [patch 2/9] Remove the support for the VXTIME_PMTMR timer mode Content-Disposition: inline; filename=remove_vxtime_pmtmr Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5726 Lines: 199 VXTIME_PMTMR will be replaced by a more generic "Master Timer" Signed-off-by: Jiri Bohac Index: linux-2.6.20-rc5/arch/x86_64/kernel/apic.c =================================================================== --- linux-2.6.20-rc5.orig/arch/x86_64/kernel/apic.c +++ linux-2.6.20-rc5/arch/x86_64/kernel/apic.c @@ -784,16 +784,7 @@ static void setup_APIC_timer(unsigned in } while (c2 - c1 < 300); } __setup_APIC_LVTT(clocks); - /* Turn off PIT interrupt if we use APIC timer as main timer. - Only works with the PM timer right now - TBD fix it for HPET too. */ - if (vxtime.mode == VXTIME_PMTMR && - smp_processor_id() == boot_cpu_id && - apic_runs_main_timer == 1 && - !cpu_isset(boot_cpu_id, timer_interrupt_broadcast_ipi_mask)) { - stop_timer_interrupt(); - apic_runs_main_timer++; - } + local_irq_restore(flags); } Index: linux-2.6.20-rc5/arch/x86_64/kernel/pmtimer.c =================================================================== --- linux-2.6.20-rc5.orig/arch/x86_64/kernel/pmtimer.c +++ linux-2.6.20-rc5/arch/x86_64/kernel/pmtimer.c @@ -29,10 +29,6 @@ * in arch/i386/kernel/acpi/boot.c */ u32 pmtmr_ioport __read_mostly; -/* value of the Power timer at last timer interrupt */ -static u32 offset_delay; -static u32 last_pmtmr_tick; - #define ACPI_PM_MASK 0xFFFFFF /* limit it to 24 bits */ static inline u32 cyc2us(u32 cycles) @@ -48,38 +44,6 @@ static inline u32 cyc2us(u32 cycles) return (cycles >> 10); } -int pmtimer_mark_offset(void) -{ - static int first_run = 1; - unsigned long tsc; - u32 lost; - - u32 tick = inl(pmtmr_ioport); - u32 delta; - - delta = cyc2us((tick - last_pmtmr_tick) & ACPI_PM_MASK); - - last_pmtmr_tick = tick; - monotonic_base += delta * NSEC_PER_USEC; - - delta += offset_delay; - - lost = delta / (USEC_PER_SEC / HZ); - offset_delay = delta % (USEC_PER_SEC / HZ); - - rdtscll(tsc); - vxtime.last_tsc = tsc - offset_delay * (u64)cpu_khz / 1000; - - /* don't calculate delay for first run, - or if we've got less then a tick */ - if (first_run || (lost < 1)) { - first_run = 0; - offset_delay = 0; - } - - return lost - 1; -} - static unsigned pmtimer_wait_tick(void) { u32 a, b; @@ -100,28 +64,3 @@ void pmtimer_wait(unsigned us) cpu_relax(); } while (cyc2us(b - a) < us); } - -void pmtimer_resume(void) -{ - last_pmtmr_tick = inl(pmtmr_ioport); -} - -unsigned int do_gettimeoffset_pm(void) -{ - u32 now, offset, delta = 0; - - offset = last_pmtmr_tick; - now = inl(pmtmr_ioport); - delta = (now - offset) & ACPI_PM_MASK; - - return offset_delay + cyc2us(delta); -} - - -static int __init nopmtimer_setup(char *s) -{ - pmtmr_ioport = 0; - return 1; -} - -__setup("nopmtimer", nopmtimer_setup); Index: linux-2.6.20-rc5/arch/x86_64/kernel/time.c =================================================================== --- linux-2.6.20-rc5.orig/arch/x86_64/kernel/time.c +++ linux-2.6.20-rc5/arch/x86_64/kernel/time.c @@ -364,13 +364,6 @@ void main_timer_handler(void) */ offset = hpet_readl(HPET_T0_CMP) - hpet_tick; delay = hpet_readl(HPET_COUNTER) - offset; - } else if (!pmtmr_ioport) { - spin_lock(&i8253_lock); - outb_p(0x00, 0x43); - delay = inb_p(0x40); - delay |= inb(0x40) << 8; - spin_unlock(&i8253_lock); - delay = LATCH - 1 - delay; } tsc = get_cycles_sync(); @@ -384,10 +377,6 @@ void main_timer_handler(void) (offset - vxtime.last) * NSEC_PER_TICK / hpet_tick; vxtime.last = offset; -#ifdef CONFIG_X86_PM_TIMER - } else if (vxtime.mode == VXTIME_PMTMR) { - lost = pmtimer_mark_offset(); -#endif } else { offset = (((tsc - vxtime.last_tsc) * vxtime.tsc_quot) >> US_SCALE) - USEC_PER_TICK; @@ -914,13 +903,6 @@ void __init time_init(void) tick_nsec = TICK_NSEC_HPET; cpu_khz = hpet_calibrate_tsc(); timename = "HPET"; -#ifdef CONFIG_X86_PM_TIMER - } else if (pmtmr_ioport && !vxtime.hpet_address) { - vxtime_hz = PM_TIMER_FREQUENCY; - timename = "PM"; - pit_init(); - cpu_khz = pit_calibrate_tsc(); -#endif } else { pit_init(); cpu_khz = pit_calibrate_tsc(); @@ -987,16 +969,6 @@ void time_init_gtod(void) vxtime.last = hpet_readl(HPET_COUNTER); vxtime.mode = VXTIME_HPET; do_gettimeoffset = do_gettimeoffset_hpet; -#ifdef CONFIG_X86_PM_TIMER - /* Using PM for gettimeofday is quite slow, but we have no other - choice because the TSC is too unreliable on some systems. */ - } else if (pmtmr_ioport && !vxtime.hpet_address && notsc) { - timetype = "PM"; - do_gettimeoffset = do_gettimeoffset_pm; - vxtime.mode = VXTIME_PMTMR; - sysctl_vsyscall = 0; - printk(KERN_INFO "Disabling vsyscall due to use of PM timer\n"); -#endif } else { timetype = hpet_use_timer ? "HPET/TSC" : "PIT/TSC"; vxtime.mode = VXTIME_TSC; @@ -1064,10 +1036,6 @@ static int timer_resume(struct sys_devic vxtime.last = hpet_readl(HPET_T0_CMP) - hpet_tick; else vxtime.last = hpet_readl(HPET_COUNTER); -#ifdef CONFIG_X86_PM_TIMER - } else if (vxtime.mode == VXTIME_PMTMR) { - pmtimer_resume(); -#endif } else vxtime.last_tsc = get_cycles_sync(); write_sequnlock_irqrestore(&xtime_lock,flags); Index: linux-2.6.20-rc5/include/asm-x86_64/vsyscall.h =================================================================== --- linux-2.6.20-rc5.orig/include/asm-x86_64/vsyscall.h +++ linux-2.6.20-rc5/include/asm-x86_64/vsyscall.h @@ -26,7 +26,6 @@ enum vsyscall_num { #define VXTIME_TSC 1 #define VXTIME_HPET 2 -#define VXTIME_PMTMR 3 #define VGETCPU_RDTSCP 1 #define VGETCPU_LSL 2 -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/