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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] x86: Remove special-case paths for start-of-day SMP bringup.
# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1274110136 -3600
# Node ID c7dde06ba1c35176e69e65dc3c7e6067e713bc47
# Parent 102dca3f485ba8e2a1742d98cca918da3a0393ae
x86: Remove special-case paths for start-of-day SMP bringup.
All CPUs are now brought up in __cpu_up(), in the correct order for
cpu-bringup notifiers.
Notably ganged TSC calibration is removed. This was another
start-of-day-specific aspect of bringup. If we really need
calibration, I think we can come up with an efficient method for APs
to calibrate themselves against PIT during their bringup (even
asynchronously, if required for efficiency).
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
xen/arch/x86/smpboot.c | 519 +++------------------------
xen/arch/x86/time.c | 56 --
xen/include/asm-x86/mach-generic/mach_apic.h | 4
xen/include/asm-x86/time.h | 3
4 files changed, 67 insertions(+), 515 deletions(-)
diff -r 102dca3f485b -r c7dde06ba1c3 xen/arch/x86/smpboot.c
--- a/xen/arch/x86/smpboot.c Mon May 17 11:05:21 2010 +0100
+++ b/xen/arch/x86/smpboot.c Mon May 17 16:28:56 2010 +0100
@@ -62,7 +62,7 @@
#define setup_trampoline() (bootsym_phys(trampoline_realmode_entry))
/* Set if we find a B stepping CPU */
-static int __devinitdata smp_b_stepping;
+static int smp_b_stepping;
/* Package ID of each logical CPU */
int phys_proc_id[NR_CPUS] __read_mostly = {[0 ... NR_CPUS-1] = BAD_APICID};
@@ -75,43 +75,26 @@ DEFINE_PER_CPU_READ_MOSTLY(cpumask_t, cp
/* representing HT and core siblings of each logical CPU */
DEFINE_PER_CPU_READ_MOSTLY(cpumask_t, cpu_core_map);
-/* bitmap of online cpus */
cpumask_t cpu_online_map __read_mostly;
EXPORT_SYMBOL(cpu_online_map);
cpumask_t cpu_callin_map;
cpumask_t cpu_callout_map;
-EXPORT_SYMBOL(cpu_callout_map);
cpumask_t cpu_possible_map = CPU_MASK_ALL;
-EXPORT_SYMBOL(cpu_possible_map);
static cpumask_t smp_commenced_mask;
-/* TSC's upper 32 bits can't be written in eariler CPU (before prescott), there
- * is no way to resync one AP against BP. TBD: for prescott and above, we
- * should use IA64's algorithm
- */
-static int __devinitdata tsc_sync_disabled;
-
-/* Per CPU bogomips and other parameters */
struct cpuinfo_x86 cpu_data[NR_CPUS];
-EXPORT_SYMBOL(cpu_data);
u32 x86_cpu_to_apicid[NR_CPUS] __read_mostly =
{ [0 ... NR_CPUS-1] = -1U };
-EXPORT_SYMBOL(x86_cpu_to_apicid);
static void map_cpu_to_logical_apicid(void);
-/* State of each CPU. */
-DEFINE_PER_CPU(int, cpu_state) = { 0 };
+
+DEFINE_PER_CPU(int, cpu_state);
void *stack_base[NR_CPUS];
-/*
- * The bootstrap kernel entry code has set these up. Save them for
- * a given CPU
- */
-
-static void __devinit smp_store_cpu_info(int id)
+static void smp_store_cpu_info(int id)
{
struct cpuinfo_x86 *c = cpu_data + id;
@@ -164,156 +147,9 @@ valid_k7:
;
}
-/*
- * TSC synchronization.
- *
- * We first check whether all CPUs have their TSC's synchronized,
- * then we print a warning if not, and always resync.
- */
-
-static atomic_t tsc_start_flag = ATOMIC_INIT(0);
-static atomic_t tsc_count_start = ATOMIC_INIT(0);
-static atomic_t tsc_count_stop = ATOMIC_INIT(0);
-static unsigned long long tsc_values[NR_CPUS];
-
-#define NR_LOOPS 5
-
-static void __init synchronize_tsc_bp (void)
-{
- int i;
- unsigned long long t0;
- unsigned long long sum, avg;
- long long delta;
- unsigned int one_usec;
- int buggy = 0;
-
- if (boot_cpu_has(X86_FEATURE_TSC_RELIABLE)) {
- printk("TSC is reliable, synchronization unnecessary\n");
- return;
- }
-
- printk("checking TSC synchronization across %u CPUs: ",
num_booting_cpus());
-
- /* convert from kcyc/sec to cyc/usec */
- one_usec = cpu_khz / 1000;
-
- atomic_set(&tsc_start_flag, 1);
- wmb();
-
- /*
- * We loop a few times to get a primed instruction cache,
- * then the last pass is more or less synchronized and
- * the BP and APs set their cycle counters to zero all at
- * once. This reduces the chance of having random offsets
- * between the processors, and guarantees that the maximum
- * delay between the cycle counters is never bigger than
- * the latency of information-passing (cachelines) between
- * two CPUs.
- */
- for (i = 0; i < NR_LOOPS; i++) {
- /*
- * all APs synchronize but they loop on '== num_cpus'
- */
- while (atomic_read(&tsc_count_start) != num_booting_cpus()-1)
- mb();
- atomic_set(&tsc_count_stop, 0);
- wmb();
- /*
- * this lets the APs save their current TSC:
- */
- atomic_inc(&tsc_count_start);
-
- rdtscll(tsc_values[smp_processor_id()]);
- /*
- * We clear the TSC in the last loop:
- */
- if (i == NR_LOOPS-1)
- write_tsc(0L);
-
- /*
- * Wait for all APs to leave the synchronization point:
- */
- while (atomic_read(&tsc_count_stop) != num_booting_cpus()-1)
- mb();
- atomic_set(&tsc_count_start, 0);
- wmb();
- atomic_inc(&tsc_count_stop);
- }
-
- sum = 0;
- for (i = 0; i < NR_CPUS; i++) {
- if (cpu_isset(i, cpu_callout_map)) {
- t0 = tsc_values[i];
- sum += t0;
- }
- }
- avg = sum;
- do_div(avg, num_booting_cpus());
-
- sum = 0;
- for (i = 0; i < NR_CPUS; i++) {
- if (!cpu_isset(i, cpu_callout_map))
- continue;
- delta = tsc_values[i] - avg;
- if (delta < 0)
- delta = -delta;
- /*
- * We report bigger than 2 microseconds clock differences.
- */
- if (delta > 2*one_usec) {
- long realdelta;
- if (!buggy) {
- buggy = 1;
- printk("\n");
- }
- realdelta = delta;
- do_div(realdelta, one_usec);
- if (tsc_values[i] < avg)
- realdelta = -realdelta;
-
- printk("CPU#%d had %ld usecs TSC skew, fixed it up.\n",
i, realdelta);
- }
-
- sum += delta;
- }
- if (!buggy)
- printk("passed.\n");
-}
-
-static void __init synchronize_tsc_ap (void)
-{
- int i;
-
- if (boot_cpu_has(X86_FEATURE_TSC_RELIABLE))
- return;
-
- /*
- * Not every cpu is online at the time
- * this gets called, so we first wait for the BP to
- * finish SMP initialization:
- */
- while (!atomic_read(&tsc_start_flag)) mb();
-
- for (i = 0; i < NR_LOOPS; i++) {
- atomic_inc(&tsc_count_start);
- while (atomic_read(&tsc_count_start) != num_booting_cpus())
- mb();
-
- rdtscll(tsc_values[smp_processor_id()]);
- if (i == NR_LOOPS-1)
- write_tsc(0L);
-
- atomic_inc(&tsc_count_stop);
- while (atomic_read(&tsc_count_stop) != num_booting_cpus()) mb();
- }
-}
-#undef NR_LOOPS
-
-extern void calibrate_delay(void);
-
static atomic_t init_deasserted;
-void __devinit smp_callin(void)
+void smp_callin(void)
{
int cpuid, phys_id, i;
@@ -357,7 +193,7 @@ void __devinit smp_callin(void)
*/
if (cpu_isset(cpuid, cpu_callout_map))
break;
- rep_nop();
+ cpu_relax();
mdelay(10);
}
@@ -379,14 +215,6 @@ void __devinit smp_callin(void)
setup_local_APIC();
map_cpu_to_logical_apicid();
-#if 0
- /*
- * Get our bogomips.
- */
- calibrate_delay();
- Dprintk("Stack at about %p\n",&cpuid);
-#endif
-
/*
* Save our processor parameters
*/
@@ -396,18 +224,9 @@ void __devinit smp_callin(void)
* Allow the master to continue.
*/
cpu_set(cpuid, cpu_callin_map);
-
- /*
- * Synchronize the TSC with the BP
- */
- if (cpu_has_tsc && cpu_khz && !tsc_sync_disabled) {
- synchronize_tsc_ap();
- /* No sync for same reason as above */
- calibrate_tsc_ap();
- }
-}
-
-static int cpucount, booting_cpu;
+}
+
+static int booting_cpu;
/* representing cpus for which sibling maps can be computed */
static cpumask_t cpu_sibling_setup_map;
@@ -478,7 +297,7 @@ static void construct_percpu_idt(unsigne
/*
* Activate a secondary processor.
*/
-void __devinit start_secondary(void *unused)
+void start_secondary(void *unused)
{
/*
* Dont put anything before smp_callin(), SMP
@@ -515,10 +334,10 @@ void __devinit start_secondary(void *unu
percpu_traps_init();
cpu_init();
- /*preempt_disable();*/
+
smp_callin();
while (!cpu_isset(smp_processor_id(), smp_commenced_mask))
- rep_nop();
+ cpu_relax();
/*
* At this point, boot CPU has fully initialised the IDT. It is
@@ -620,81 +439,7 @@ static inline void __inquire_remote_apic
}
#endif
-#ifdef WAKE_SECONDARY_VIA_NMI
-
-static int logical_apicid_to_cpu(int logical_apicid)
-{
- int i;
-
- for ( i = 0; i < sizeof(cpu_2_logical_apicid); i++ )
- if ( cpu_2_logical_apicid[i] == logical_apicid )
- break;
-
- if ( i == sizeof(cpu_2_logical_apicid) );
- i = -1; /* not found */
-
- return i;
-}
-
-/*
- * Poke the other CPU in the eye via NMI to wake it up. Remember that the
normal
- * INIT, INIT, STARTUP sequence will reset the chip hard for us, and this
- * won't ... remember to clear down the APIC, etc later.
- */
-static int __devinit
-wakeup_secondary_cpu(int logical_apicid, unsigned long start_eip)
-{
- unsigned long send_status = 0, accept_status = 0;
- int timeout, maxlvt;
- int dest_cpu;
- u32 dest;
-
- dest_cpu = logical_apicid_to_cpu(logical_apicid);
- BUG_ON(dest_cpu == -1);
-
- dest = cpu_physical_id(dest_cpu);
-
- /* Boot on the stack */
- apic_icr_write(APIC_DM_NMI | APIC_DEST_PHYSICAL, dest_cpu);
-
- Dprintk("Waiting for send to finish...\n");
- timeout = 0;
- do {
- Dprintk("+");
- udelay(100);
- if ( !x2apic_enabled )
- send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY;
- else
- send_status = 0; /* We go out of the loop directly. */
- } while (send_status && (timeout++ < 1000));
-
- /*
- * Give the other CPU some time to accept the IPI.
- */
- udelay(200);
- /*
- * Due to the Pentium erratum 3AP.
- */
- maxlvt = get_maxlvt();
- if (maxlvt > 3) {
- apic_read_around(APIC_SPIV);
- apic_write(APIC_ESR, 0);
- }
- accept_status = (apic_read(APIC_ESR) & 0xEF);
- Dprintk("NMI sent.\n");
-
- if (send_status)
- printk("APIC never delivered???\n");
- if (accept_status)
- printk("APIC delivery error (%lx).\n", accept_status);
-
- return (send_status | accept_status);
-}
-#endif /* WAKE_SECONDARY_VIA_NMI */
-
-#ifdef WAKE_SECONDARY_VIA_INIT
-static int __devinit
-wakeup_secondary_cpu(int phys_apicid, unsigned long start_eip)
+static int wakeup_secondary_cpu(int phys_apicid, unsigned long start_eip)
{
unsigned long send_status = 0, accept_status = 0;
int maxlvt, timeout, num_starts, j;
@@ -817,7 +562,6 @@ wakeup_secondary_cpu(int phys_apicid, un
return (send_status | accept_status);
}
-#endif /* WAKE_SECONDARY_VIA_INIT */
extern cpumask_t cpu_initialized;
/*
@@ -842,7 +586,7 @@ static void *prepare_idle_stack(unsigned
return stack_base[cpu];
}
-static int __devinit do_boot_cpu(int apicid, int cpu)
+static int do_boot_cpu(int apicid, int cpu)
/*
* NOTE - on most systems this is a PHYSICAL apic ID, but on multiquad
* (ie clustered apic addressing mode), this is a LOGICAL apic ID.
@@ -865,8 +609,6 @@ static int __devinit do_boot_cpu(int api
* (e.g. by the ACPI SMI) to initialize new CPUs with MTRRs in sync:
*/
mtrr_save_state();
-
- ++cpucount;
booting_cpu = cpu;
@@ -980,28 +722,27 @@ static int __devinit do_boot_cpu(int api
if (boot_error) {
/* Try to put things back the way they were before ... */
unmap_cpu_to_logical_apicid(cpu);
- cpu_clear(cpu, cpu_callout_map); /* was set here
(do_boot_cpu()) */
+ cpu_clear(cpu, cpu_callout_map); /* was set here */
cpu_clear(cpu, cpu_initialized); /* was set by cpu_init() */
- cpucount--;
/* Mark the CPU as non-present */
x86_cpu_to_apicid[cpu] = BAD_APICID;
cpu_clear(cpu, cpu_present_map);
- } else {
}
/* mark "stuck" area as not stuck */
bootsym(trampoline_cpu_started) = 0;
mb();
- return boot_error;
+ smpboot_restore_warm_reset_vector();
+
+ return boot_error ? -EIO : 0;
}
void cpu_exit_clear(void)
{
int cpu = raw_smp_processor_id();
- cpucount--;
cpu_uninit();
cpu_clear(cpu, cpu_callout_map);
@@ -1011,43 +752,9 @@ void cpu_exit_clear(void)
unmap_cpu_to_logical_apicid(cpu);
}
-static int __cpuinit __smp_prepare_cpu(int cpu)
-{
- int apicid, ret;
-
- apicid = x86_cpu_to_apicid[cpu];
- if (apicid == BAD_APICID) {
- ret = -ENODEV;
- goto exit;
- }
-
- tsc_sync_disabled = 1;
-
- do_boot_cpu(apicid, cpu);
-
- tsc_sync_disabled = 0;
-
- ret = 0;
-exit:
- return ret;
-}
-
-/*
- * Cycle through the processors sending APIC IPIs to boot each.
- */
-
-/* Where the IO area was mapped on multiquad, always 0 otherwise */
-void *xquad_portio;
-#ifdef CONFIG_X86_NUMAQ
-EXPORT_SYMBOL(xquad_portio);
-#endif
-
-static void __init smp_boot_cpus(unsigned int max_cpus)
-{
- int apicid, cpu, kicked;
-#ifdef BOGOMIPS
- unsigned long bogosum = 0;
-#endif
+void __init smp_prepare_cpus(unsigned int max_cpus)
+{
+ mtrr_aps_sync_begin();
/*
* Setup boot CPU information
@@ -1059,9 +766,6 @@ static void __init smp_boot_cpus(unsigne
x86_cpu_to_apicid[0] = boot_cpu_physical_apicid;
stack_base[0] = stack_start.esp;
-
- /*current_thread_info()->cpu = 0;*/
- /*smp_tune_scheduling();*/
set_cpu_sibling_map(0);
@@ -1096,7 +800,8 @@ static void __init smp_boot_cpus(unsigne
/*
* If we couldn't find a local APIC, then get out of here now!
*/
- if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid]) &&
!cpu_has_apic) {
+ if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])
+ && !cpu_has_apic) {
printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n",
boot_cpu_physical_apicid);
goto init_uniprocessor;
@@ -1104,96 +809,10 @@ static void __init smp_boot_cpus(unsigne
verify_local_APIC();
- /*
- * If SMP should be disabled, then really disable it!
- */
- if (!max_cpus)
- goto init_uniprocessor;
-
connect_bsp_APIC();
setup_local_APIC();
map_cpu_to_logical_apicid();
-
- setup_portio_remap();
-
- /*
- * Scan the CPU present map and fire up the other CPUs via do_boot_cpu
- *
- * In clustered apic mode, phys_cpu_present_map is a constructed thus:
- * bits 0-3 are quad0, 4-7 are quad1, etc. A perverse twist on the
- * clustered apic ID.
- */
- Dprintk("CPU present map: %lx\n", physids_coerce(phys_cpu_present_map));
-
- kicked = 1;
-
- for_each_present_cpu ( cpu )
- {
- apicid = x86_cpu_to_apicid[cpu];
-
- /*
- * Don't even attempt to start the boot CPU!
- */
- if ((apicid == boot_cpu_apicid) || (apicid == BAD_APICID))
- continue;
-
- if (!check_apicid_present(apicid)) {
- dprintk(XENLOG_WARNING,
- "Present CPU has valid apicid\n");
- continue;
- }
-
- if (max_cpus <= cpucount+1)
- continue;
-
- if ( do_boot_cpu(apicid, cpu))
- printk("CPU #%d not responding - cannot use it.\n",
- apicid);
- else
- ++kicked;
- }
-
- /*
- * Cleanup possible dangling ends...
- */
- smpboot_restore_warm_reset_vector();
-
-#ifdef BOGOMIPS
- /*
- * Allow the user to impress friends.
- */
- Dprintk("Before bogomips.\n");
- for (cpu = 0; cpu < NR_CPUS; cpu++)
- if (cpu_isset(cpu, cpu_callout_map))
- bogosum += cpu_data[cpu].loops_per_jiffy;
- printk(KERN_INFO
- "Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
- cpucount+1,
- bogosum/(500000/HZ),
- (bogosum/(5000/HZ))%100);
-#else
- printk("Total of %d processors activated.\n", cpucount+1);
-#endif
-
- Dprintk("Before bogocount - setting activated=1.\n");
-
- if (smp_b_stepping)
- printk(KERN_WARNING "WARNING: SMP operation may be unreliable
with B stepping processors.\n");
-
- /*
- * Don't taint if we are running SMP kernel on a single non-MP
- * approved Athlon
- */
- if (tainted & TAINT_UNSAFE_SMP) {
- if (cpucount)
- printk (KERN_INFO "WARNING: This combination of AMD
processors is not suitable for SMP.\n");
- else
- tainted &= ~TAINT_UNSAFE_SMP;
- }
-
- Dprintk("Boot done.\n");
-
/*
* construct cpu_sibling_map, so that we can tell sibling CPUs
* efficiently.
@@ -1201,34 +820,15 @@ static void __init smp_boot_cpus(unsigne
cpu_set(0, per_cpu(cpu_sibling_map, 0));
cpu_set(0, per_cpu(cpu_core_map, 0));
- if (nmi_watchdog == NMI_LOCAL_APIC)
- check_nmi_watchdog();
-
smpboot_setup_io_apic();
setup_boot_APIC_clock();
-
- /*
- * Synchronize the TSC with the AP
- */
- if (cpu_has_tsc && cpucount && cpu_khz)
- synchronize_tsc_bp();
- calibrate_tsc_bp();
-}
-
-/* These are wrappers to interface to the new boot process. Someone
- who understands all this stuff should rewrite it properly. --RR 15/Jul/02 */
-void __init smp_prepare_cpus(unsigned int max_cpus)
-{
- smp_commenced_mask = cpumask_of_cpu(0);
- cpu_callin_map = cpumask_of_cpu(0);
- mb();
- smp_boot_cpus(max_cpus);
- mtrr_aps_sync_begin();
-}
-
-void __devinit smp_prepare_boot_cpu(void)
-{
+}
+
+void __init smp_prepare_boot_cpu(void)
+{
+ cpu_set(smp_processor_id(), smp_commenced_mask);
+ cpu_set(smp_processor_id(), cpu_callin_map);
cpu_set(smp_processor_id(), cpu_online_map);
cpu_set(smp_processor_id(), cpu_callout_map);
cpu_set(smp_processor_id(), cpu_present_map);
@@ -1292,9 +892,9 @@ void __cpu_die(unsigned int cpu)
for (;;) {
/* They ack this in play_dead by setting CPU_DEAD */
if (per_cpu(cpu_state, cpu) == CPU_DEAD)
- return;
+ break;
mdelay(100);
- mb();
+ cpu_relax();
process_pending_softirqs();
if ((++i % 10) == 0)
printk(KERN_ERR "CPU %u still not dead...\n", cpu);
@@ -1356,30 +956,21 @@ int cpu_add(uint32_t apic_id, uint32_t a
}
-int __devinit __cpu_up(unsigned int cpu)
-{
- /*
- * We do warm boot only on cpus that had booted earlier
- * Otherwise cold boot is all handled from smp_boot_cpus().
- * cpu_callin_map is set during AP kickstart process. Its reset
- * when a cpu is taken offline from cpu_exit_clear().
- */
- if (!cpu_isset(cpu, cpu_callin_map)) {
- if (__smp_prepare_cpu(cpu))
- return -EIO;
- smpboot_restore_warm_reset_vector();
- }
-
- /* In case one didn't come up */
- if (!cpu_isset(cpu, cpu_callin_map)) {
- printk(KERN_DEBUG "skipping cpu%d, didn't come online\n", cpu);
- return -EIO;
- }
-
- /* Unleash the CPU! */
+int __cpu_up(unsigned int cpu)
+{
+ int apicid, ret;
+
+ BUG_ON(cpu_isset(cpu, cpu_callin_map));
+
+ if ((apicid = x86_cpu_to_apicid[cpu]) == BAD_APICID)
+ return -ENODEV;
+
+ if ((ret = do_boot_cpu(apicid, cpu)) != 0)
+ return ret;
+
cpu_set(cpu, smp_commenced_mask);
while (!cpu_isset(cpu, cpu_online_map)) {
- mb();
+ cpu_relax();
process_pending_softirqs();
}
@@ -1389,9 +980,27 @@ int __devinit __cpu_up(unsigned int cpu)
void __init smp_cpus_done(unsigned int max_cpus)
{
-#ifdef CONFIG_X86_IO_APIC
+ if (smp_b_stepping)
+ printk(KERN_WARNING "WARNING: SMP operation may be "
+ "unreliable with B stepping processors.\n");
+
+ /*
+ * Don't taint if we are running SMP kernel on a single non-MP
+ * approved Athlon
+ */
+ if (tainted & TAINT_UNSAFE_SMP) {
+ if (num_online_cpus() > 1)
+ printk(KERN_INFO "WARNING: This combination of AMD "
+ "processors is not suitable for SMP.\n");
+ else
+ tainted &= ~TAINT_UNSAFE_SMP;
+ }
+
+ if (nmi_watchdog == NMI_LOCAL_APIC)
+ check_nmi_watchdog();
+
setup_ioapic_dest();
-#endif
+
mtrr_save_state();
mtrr_aps_sync_end();
}
diff -r 102dca3f485b -r c7dde06ba1c3 xen/arch/x86/time.c
--- a/xen/arch/x86/time.c Mon May 17 11:05:21 2010 +0100
+++ b/xen/arch/x86/time.c Mon May 17 16:28:56 2010 +0100
@@ -304,52 +304,6 @@ static void set_time_scale(struct time_s
ts->shift = shift;
}
-static atomic_t tsc_calibrate_gang = ATOMIC_INIT(0);
-static unsigned int tsc_calibrate_status = 0;
-
-void calibrate_tsc_bp(void)
-{
- while ( atomic_read(&tsc_calibrate_gang) != (num_booting_cpus() - 1) )
- mb();
-
- outb(CALIBRATE_LATCH & 0xff, PIT_CH2);
- outb(CALIBRATE_LATCH >> 8, PIT_CH2);
-
- tsc_calibrate_status = 1;
- wmb();
-
- while ( (inb(0x61) & 0x20) == 0 )
- continue;
-
- tsc_calibrate_status = 2;
- wmb();
-
- while ( atomic_read(&tsc_calibrate_gang) != 0 )
- mb();
-}
-
-void calibrate_tsc_ap(void)
-{
- u64 t1, t2, ticks_per_sec;
-
- atomic_inc(&tsc_calibrate_gang);
-
- while ( tsc_calibrate_status < 1 )
- mb();
-
- rdtscll(t1);
-
- while ( tsc_calibrate_status < 2 )
- mb();
-
- rdtscll(t2);
-
- ticks_per_sec = (t2 - t1) * (u64)CALIBRATE_FRAC;
- set_time_scale(&this_cpu(cpu_time).tsc_scale, ticks_per_sec);
-
- atomic_dec(&tsc_calibrate_gang);
-}
-
static char *freq_string(u64 freq)
{
static char s[20];
@@ -1401,9 +1355,8 @@ void init_percpu_time(void)
unsigned long flags;
s_time_t now;
- /* If we have constant-rate TSCs then scale factor can be shared. */
- if ( boot_cpu_has(X86_FEATURE_CONSTANT_TSC) )
- this_cpu(cpu_time).tsc_scale = per_cpu(cpu_time, 0).tsc_scale;
+ /* Initial estimate for TSC rate. */
+ this_cpu(cpu_time).tsc_scale = per_cpu(cpu_time, 0).tsc_scale;
local_irq_save(flags);
rdtscll(t->local_tsc_stamp);
@@ -1568,10 +1521,7 @@ int time_suspend(void)
int time_resume(void)
{
- /*u64 tmp = */init_pit_and_calibrate_tsc();
-
- /* Disable this while calibrate_tsc_ap() also is skipped. */
- /*set_time_scale(&this_cpu(cpu_time).tsc_scale, tmp);*/
+ init_pit_and_calibrate_tsc();
resume_platform_timer();
diff -r 102dca3f485b -r c7dde06ba1c3
xen/include/asm-x86/mach-generic/mach_apic.h
--- a/xen/include/asm-x86/mach-generic/mach_apic.h Mon May 17 11:05:21
2010 +0100
+++ b/xen/include/asm-x86/mach-generic/mach_apic.h Mon May 17 16:28:56
2010 +0100
@@ -35,10 +35,6 @@ static inline int mpc_apic_id(struct mpc
(m->mpc_cpufeature & CPU_MODEL_MASK) >> 4,
m->mpc_apicver);
return (m->mpc_apicid);
-}
-
-static inline void setup_portio_remap(void)
-{
}
static inline int multi_timer_check(int apic, int irq)
diff -r 102dca3f485b -r c7dde06ba1c3 xen/include/asm-x86/time.h
--- a/xen/include/asm-x86/time.h Mon May 17 11:05:21 2010 +0100
+++ b/xen/include/asm-x86/time.h Mon May 17 16:28:56 2010 +0100
@@ -21,9 +21,6 @@
#define TSC_MODE_ALWAYS_EMULATE 1
#define TSC_MODE_NEVER_EMULATE 2
#define TSC_MODE_PVRDTSCP 3
-
-void calibrate_tsc_bp(void);
-void calibrate_tsc_ap(void);
typedef u64 cycles_t;
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