Re: v2.6.19-rt6, yum/rpm

From: Ingo Molnar
Date: Thu Feb 01 2007 - 12:51:24 EST


* Ingo Molnar <mingo@xxxxxxx> wrote:

> * Sergei Shtylyov <sshtylyov@xxxxxxxxxxxxx> wrote:
>
> > >could you resend them to me please?
> >
> > Seeing that GENERIC_TIME has been thrown out from the -rt patch,
> > [...]
>
> hm, i did that accidentally during a rebase. That was certainly not
> meant to be a persistent condition.

ok, the delta below is what i've managed to restore from your PPC
patches so far. Looks like this was truly a comedy of errors: i
accidentally dropped the big ppc-gtod patch, which made your later fix
patches not apply, etc., etc. The one below still likely wont build
right away, but should be a more useful base for you and for Thomas too.

Ingo

--------------->
Index: linux/Makefile
===================================================================
--- linux.orig/Makefile
+++ linux/Makefile
@@ -1,7 +1,7 @@
VERSION = 2
PATCHLEVEL = 6
SUBLEVEL = 20
-EXTRAVERSION =-rc7-rt3
+EXTRAVERSION =-rc7-rt4
NAME = Homicidal Dwarf Hamster

# *DOCUMENTATION*
Index: linux/arch/powerpc/Kconfig
===================================================================
--- linux.orig/arch/powerpc/Kconfig
+++ linux/arch/powerpc/Kconfig
@@ -26,6 +26,10 @@ config MMU
bool
default y

+config GENERIC_TIME
+ bool
+ default y
+
config GENERIC_HARDIRQS
bool
default y
Index: linux/arch/powerpc/kernel/time.c
===================================================================
--- linux.orig/arch/powerpc/kernel/time.c
+++ linux/arch/powerpc/kernel/time.c
@@ -119,8 +119,6 @@ EXPORT_SYMBOL_GPL(rtc_lock);
u64 tb_to_ns_scale;
unsigned tb_to_ns_shift;

-struct gettimeofday_struct do_gtod;
-
extern struct timezone sys_tz;
static long timezone_offset;

@@ -378,160 +376,6 @@ static __inline__ void timer_check_rtc(v
}
}

-/*
- * This version of gettimeofday has microsecond resolution.
- */
-static inline void __do_gettimeofday(struct timeval *tv)
-{
- unsigned long sec, usec;
- u64 tb_ticks, xsec;
- struct gettimeofday_vars *temp_varp;
- u64 temp_tb_to_xs, temp_stamp_xsec;
-
- /*
- * These calculations are faster (gets rid of divides)
- * if done in units of 1/2^20 rather than microseconds.
- * The conversion to microseconds at the end is done
- * without a divide (and in fact, without a multiply)
- */
- temp_varp = do_gtod.varp;
-
- /* Sampling the time base must be done after loading
- * do_gtod.varp in order to avoid racing with update_gtod.
- */
- data_barrier(temp_varp);
- tb_ticks = get_tb() - temp_varp->tb_orig_stamp;
- temp_tb_to_xs = temp_varp->tb_to_xs;
- temp_stamp_xsec = temp_varp->stamp_xsec;
- xsec = temp_stamp_xsec + mulhdu(tb_ticks, temp_tb_to_xs);
- sec = xsec / XSEC_PER_SEC;
- usec = (unsigned long)xsec & (XSEC_PER_SEC - 1);
- usec = SCALE_XSEC(usec, 1000000);
-
- tv->tv_sec = sec;
- tv->tv_usec = usec;
-}
-
-void do_gettimeofday(struct timeval *tv)
-{
- if (__USE_RTC()) {
- /* do this the old way */
- unsigned long flags, seq;
- unsigned int sec, nsec, usec;
-
- do {
- seq = read_seqbegin_irqsave(&xtime_lock, flags);
- sec = xtime.tv_sec;
- nsec = xtime.tv_nsec + tb_ticks_since(tb_last_jiffy);
- } while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
- usec = nsec / 1000;
- while (usec >= 1000000) {
- usec -= 1000000;
- ++sec;
- }
- tv->tv_sec = sec;
- tv->tv_usec = usec;
- return;
- }
- __do_gettimeofday(tv);
-}
-
-EXPORT_SYMBOL(do_gettimeofday);
-
-/*
- * There are two copies of tb_to_xs and stamp_xsec so that no
- * lock is needed to access and use these values in
- * do_gettimeofday. We alternate the copies and as long as a
- * reasonable time elapses between changes, there will never
- * be inconsistent values. ntpd has a minimum of one minute
- * between updates.
- */
-static inline void update_gtod(u64 new_tb_stamp, u64 new_stamp_xsec,
- u64 new_tb_to_xs)
-{
- unsigned temp_idx;
- struct gettimeofday_vars *temp_varp;
-
- temp_idx = (do_gtod.var_idx == 0);
- temp_varp = &do_gtod.vars[temp_idx];
-
- temp_varp->tb_to_xs = new_tb_to_xs;
- temp_varp->tb_orig_stamp = new_tb_stamp;
- temp_varp->stamp_xsec = new_stamp_xsec;
- smp_mb();
- do_gtod.varp = temp_varp;
- do_gtod.var_idx = temp_idx;
-
- /*
- * tb_update_count is used to allow the userspace gettimeofday code
- * to assure itself that it sees a consistent view of the tb_to_xs and
- * stamp_xsec variables. It reads the tb_update_count, then reads
- * tb_to_xs and stamp_xsec and then reads tb_update_count again. If
- * the two values of tb_update_count match and are even then the
- * tb_to_xs and stamp_xsec values are consistent. If not, then it
- * loops back and reads them again until this criteria is met.
- * We expect the caller to have done the first increment of
- * vdso_data->tb_update_count already.
- */
- vdso_data->tb_orig_stamp = new_tb_stamp;
- vdso_data->stamp_xsec = new_stamp_xsec;
- vdso_data->tb_to_xs = new_tb_to_xs;
- vdso_data->wtom_clock_sec = wall_to_monotonic.tv_sec;
- vdso_data->wtom_clock_nsec = wall_to_monotonic.tv_nsec;
- smp_wmb();
- ++(vdso_data->tb_update_count);
-}
-
-/*
- * When the timebase - tb_orig_stamp gets too big, we do a manipulation
- * between tb_orig_stamp and stamp_xsec. The goal here is to keep the
- * difference tb - tb_orig_stamp small enough to always fit inside a
- * 32 bits number. This is a requirement of our fast 32 bits userland
- * implementation in the vdso. If we "miss" a call to this function
- * (interrupt latency, CPU locked in a spinlock, ...) and we end up
- * with a too big difference, then the vdso will fallback to calling
- * the syscall
- */
-static __inline__ void timer_recalc_offset(u64 cur_tb)
-{
- unsigned long offset;
- u64 new_stamp_xsec;
- u64 tlen, t2x;
- u64 tb, xsec_old, xsec_new;
- struct gettimeofday_vars *varp;
-
- if (__USE_RTC())
- return;
- tlen = current_tick_length();
- offset = cur_tb - do_gtod.varp->tb_orig_stamp;
- if (tlen == last_tick_len && offset < 0x80000000u)
- return;
- if (tlen != last_tick_len) {
- t2x = mulhdu(tlen << TICKLEN_SHIFT, ticklen_to_xs);
- last_tick_len = tlen;
- } else
- t2x = do_gtod.varp->tb_to_xs;
- new_stamp_xsec = (u64) xtime.tv_nsec * XSEC_PER_SEC;
- do_div(new_stamp_xsec, 1000000000);
- new_stamp_xsec += (u64) xtime.tv_sec * XSEC_PER_SEC;
-
- ++vdso_data->tb_update_count;
- smp_mb();
-
- /*
- * Make sure time doesn't go backwards for userspace gettimeofday.
- */
- tb = get_tb();
- varp = do_gtod.varp;
- xsec_old = mulhdu(tb - varp->tb_orig_stamp, varp->tb_to_xs)
- + varp->stamp_xsec;
- xsec_new = mulhdu(tb - cur_tb, t2x) + new_stamp_xsec;
- if (xsec_new < xsec_old)
- new_stamp_xsec += xsec_old - xsec_new;
-
- update_gtod(cur_tb, new_stamp_xsec, t2x);
-}
-
#ifdef CONFIG_SMP
unsigned long notrace profile_pc(struct pt_regs *regs)
{
@@ -581,11 +425,7 @@ static void iSeries_tb_recal(void)
tb_ticks_per_sec = new_tb_ticks_per_sec;
calc_cputime_factors();
div128_by_32( XSEC_PER_SEC, 0, tb_ticks_per_sec, &divres );
- do_gtod.tb_ticks_per_sec = tb_ticks_per_sec;
tb_to_xs = divres.result_low;
- do_gtod.varp->tb_to_xs = tb_to_xs;
- vdso_data->tb_ticks_per_sec = tb_ticks_per_sec;
- vdso_data->tb_to_xs = tb_to_xs;
}
else {
printk( "Titan recalibrate: FAILED (difference > 4 percent)\n"
@@ -756,77 +596,6 @@ unsigned long long sched_clock(void)
return mulhdu(get_tb(), tb_to_ns_scale) << tb_to_ns_shift;
}

-int do_settimeofday(struct timespec *tv)
-{
- time_t wtm_sec, new_sec = tv->tv_sec;
- long wtm_nsec, new_nsec = tv->tv_nsec;
- unsigned long flags;
- u64 new_xsec;
- unsigned long tb_delta;
-
- if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
- return -EINVAL;
-
- write_seqlock_irqsave(&xtime_lock, flags);
-
- /*
- * Updating the RTC is not the job of this code. If the time is
- * stepped under NTP, the RTC will be updated after STA_UNSYNC
- * is cleared. Tools like clock/hwclock either copy the RTC
- * to the system time, in which case there is no point in writing
- * to the RTC again, or write to the RTC but then they don't call
- * settimeofday to perform this operation.
- */
-#ifdef CONFIG_PPC_ISERIES
- if (firmware_has_feature(FW_FEATURE_ISERIES) && first_settimeofday) {
- iSeries_tb_recal();
- first_settimeofday = 0;
- }
-#endif
-
- /* Make userspace gettimeofday spin until we're done. */
- ++vdso_data->tb_update_count;
- smp_mb();
-
- /*
- * Subtract off the number of nanoseconds since the
- * beginning of the last tick.
- */
- tb_delta = tb_ticks_since(tb_last_jiffy);
- tb_delta = mulhdu(tb_delta, do_gtod.varp->tb_to_xs); /* in xsec */
- new_nsec -= SCALE_XSEC(tb_delta, 1000000000);
-
- wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - new_sec);
- wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - new_nsec);
-
- set_normalized_timespec(&xtime, new_sec, new_nsec);
- set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
-
- /* In case of a large backwards jump in time with NTP, we want the
- * clock to be updated as soon as the PLL is again in lock.
- */
- last_rtc_update = new_sec - 658;
-
- ntp_clear();
-
- new_xsec = xtime.tv_nsec;
- if (new_xsec != 0) {
- new_xsec *= XSEC_PER_SEC;
- do_div(new_xsec, NSEC_PER_SEC);
- }
- new_xsec += (u64)xtime.tv_sec * XSEC_PER_SEC;
- update_gtod(tb_last_jiffy, new_xsec, do_gtod.varp->tb_to_xs);
-
- vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
- vdso_data->tz_dsttime = sys_tz.tz_dsttime;
-
- write_sequnlock_irqrestore(&xtime_lock, flags);
- clock_was_set();
- return 0;
-}
-
-EXPORT_SYMBOL(do_settimeofday);
-
static int __init get_freq(char *name, int cells, unsigned long *val)
{
struct device_node *cpu;
@@ -993,20 +762,6 @@ void __init time_init(void)

xtime.tv_sec = tm;
xtime.tv_nsec = 0;
- do_gtod.varp = &do_gtod.vars[0];
- do_gtod.var_idx = 0;
- do_gtod.varp->tb_orig_stamp = tb_last_jiffy;
- __get_cpu_var(last_jiffy) = tb_last_jiffy;
- do_gtod.varp->stamp_xsec = (u64) xtime.tv_sec * XSEC_PER_SEC;
- do_gtod.tb_ticks_per_sec = tb_ticks_per_sec;
- do_gtod.varp->tb_to_xs = tb_to_xs;
- do_gtod.tb_to_us = tb_to_us;
-
- vdso_data->tb_orig_stamp = tb_last_jiffy;
- vdso_data->tb_update_count = 0;
- vdso_data->tb_ticks_per_sec = tb_ticks_per_sec;
- vdso_data->stamp_xsec = (u64) xtime.tv_sec * XSEC_PER_SEC;
- vdso_data->tb_to_xs = tb_to_xs;

time_freq = 0;

@@ -1019,7 +774,6 @@ void __init time_init(void)
set_dec(tb_ticks_per_jiffy);
}

-
#define FEBRUARY 2
#define STARTOFTIME 1970
#define SECDAY 86400L
@@ -1164,3 +918,36 @@ void div128_by_32(u64 dividend_high, u64
dr->result_low = ((u64)y << 32) + z;

}
+
+/* PowerPC clocksource code */
+
+#include <linux/clocksource.h>
+
+static cycle_t timebase_read(void)
+{
+ return (cycle_t)get_tb();
+}
+
+struct clocksource clocksource_timebase = {
+ .name = "timebase",
+ .rating = 200,
+ .read = timebase_read,
+ .mask = (cycle_t)-1,
+ .mult = 0,
+ .shift = 22,
+ .is_continuous = 1,
+};
+
+
+/* XXX - this should be calculated or properly externed! */
+static int __init init_timebase_clocksource(void)
+{
+ if (__USE_RTC())
+ return -ENODEV;
+
+ clocksource_timebase.mult = clocksource_hz2mult(tb_ticks_per_sec,
+ clocksource_timebase.shift);
+ return clocksource_register(&clocksource_timebase);
+}
+
+module_init(init_timebase_clocksource);
Index: linux/arch/powerpc/platforms/cell/interrupt.c
===================================================================
--- linux.orig/arch/powerpc/platforms/cell/interrupt.c
+++ linux/arch/powerpc/platforms/cell/interrupt.c
@@ -90,6 +90,7 @@ static struct irq_chip iic_chip = {
.typename = " CELL-IIC ",
.mask = iic_mask,
.unmask = iic_unmask,
+ .ack = iic_eoi,
.eoi = iic_eoi,
};

Index: linux/arch/powerpc/platforms/iseries/irq.c
===================================================================
--- linux.orig/arch/powerpc/platforms/iseries/irq.c
+++ linux/arch/powerpc/platforms/iseries/irq.c
@@ -279,6 +279,7 @@ static struct irq_chip iseries_pic = {
.shutdown = iseries_shutdown_IRQ,
.unmask = iseries_enable_IRQ,
.mask = iseries_disable_IRQ,
+ .ack = iseries_end_IRQ,
.eoi = iseries_end_IRQ
};

Index: linux/arch/powerpc/platforms/pseries/xics.c
===================================================================
--- linux.orig/arch/powerpc/platforms/pseries/xics.c
+++ linux/arch/powerpc/platforms/pseries/xics.c
@@ -456,6 +456,7 @@ static struct irq_chip xics_pic_direct =
.startup = xics_startup,
.mask = xics_mask_irq,
.unmask = xics_unmask_irq,
+ .ack = xics_eoi_direct,
.eoi = xics_eoi_direct,
.set_affinity = xics_set_affinity
};
@@ -466,6 +467,7 @@ static struct irq_chip xics_pic_lpar = {
.startup = xics_startup,
.mask = xics_mask_irq,
.unmask = xics_unmask_irq,
+ .ack = xics_eoi_lpar,
.eoi = xics_eoi_lpar,
.set_affinity = xics_set_affinity
};
Index: linux/arch/powerpc/sysdev/mpic.c
===================================================================
--- linux.orig/arch/powerpc/sysdev/mpic.c
+++ linux/arch/powerpc/sysdev/mpic.c
@@ -767,6 +767,7 @@ static int mpic_set_irq_type(unsigned in
static struct irq_chip mpic_irq_chip = {
.mask = mpic_mask_irq,
.unmask = mpic_unmask_irq,
+ .ack = mpic_end_irq,
.eoi = mpic_end_irq,
.set_type = mpic_set_irq_type,
};
Index: linux/drivers/mtd/nand/cafe.c
===================================================================
--- linux.orig/drivers/mtd/nand/cafe.c
+++ linux/drivers/mtd/nand/cafe.c
@@ -597,7 +597,8 @@ static int __devinit cafe_nand_probe(str
cafe_writel(cafe, 0xffffffff, NAND_TIMING3);
}
cafe_writel(cafe, 0xffffffff, NAND_IRQ_MASK);
- err = request_irq(pdev->irq, &cafe_nand_interrupt, SA_SHIRQ, "CAFE NAND", mtd);
+ err = request_irq(pdev->irq, &cafe_nand_interrupt, IRQF_SHARED,
+ "CAFE NAND", mtd);
if (err) {
dev_warn(&pdev->dev, "Could not register IRQ %d\n", pdev->irq);

Index: linux/kernel/latency_trace.c
===================================================================
--- linux.orig/kernel/latency_trace.c
+++ linux/kernel/latency_trace.c
@@ -1774,8 +1774,8 @@ check_critical_timing(int cpu, struct cp
#ifndef CONFIG_CRITICAL_LATENCY_HIST
if (!preempt_thresh && preempt_max_latency > delta) {
printk("bug: updating %016Lx > %016Lx?\n",
- preempt_max_latency, delta);
- printk(" [%016Lx %016Lx %016Lx]\n", T0, T1, T2);
+ (u64)preempt_max_latency, (u64)delta);
+ printk(" [%016Lx %016Lx %016Lx]\n", (u64)T0, (u64)T1, (u64)T2);
}
#endif


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