Add a new function pointer calibrate_apic to x86_platform_ops. On native this
does the usual apic calibration. On VMware's platform we override it with a
routine which gets that information from the hypervisor.
Signed-off-by: Alok N Kataria <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Index: linux-x86-tree.git/arch/x86/include/asm/apic.h
===================================================================
--- linux-x86-tree.git.orig/arch/x86/include/asm/apic.h 2010-08-17 15:29:21.000000000 -0700
+++ linux-x86-tree.git/arch/x86/include/asm/apic.h 2010-08-17 15:32:11.000000000 -0700
@@ -238,6 +238,7 @@ extern void setup_boot_APIC_clock(void);
extern void setup_secondary_APIC_clock(void);
extern int APIC_init_uniprocessor(void);
extern void enable_NMI_through_LVT0(void);
+extern unsigned int native_calibrate_apic(void);
/*
* On 32bit this is mach-xxx local
Index: linux-x86-tree.git/arch/x86/include/asm/x86_init.h
===================================================================
--- linux-x86-tree.git.orig/arch/x86/include/asm/x86_init.h 2010-08-17 15:29:21.000000000 -0700
+++ linux-x86-tree.git/arch/x86/include/asm/x86_init.h 2010-08-18 10:20:21.000000000 -0700
@@ -143,6 +143,7 @@ struct x86_cpuinit_ops {
* @is_untracked_pat_range exclude from PAT logic
* @nmi_init enable NMI on cpus
* @i8042_detect pre-detect if i8042 controller exists
+ * @calibrate_apic: calibrate APIC bus freq
*/
struct x86_platform_ops {
unsigned long (*calibrate_tsc)(void);
@@ -152,6 +153,7 @@ struct x86_platform_ops {
bool (*is_untracked_pat_range)(u64 start, u64 end);
void (*nmi_init)(void);
int (*i8042_detect)(void);
+ unsigned int (*calibrate_apic)(void);
};
extern struct x86_init_ops x86_init;
Index: linux-x86-tree.git/arch/x86/kernel/apic/apic.c
===================================================================
--- linux-x86-tree.git.orig/arch/x86/kernel/apic/apic.c 2010-08-17 15:29:21.000000000 -0700
+++ linux-x86-tree.git/arch/x86/kernel/apic/apic.c 2010-08-18 10:20:55.000000000 -0700
@@ -176,7 +176,7 @@ static struct resource lapic_resource =
.flags = IORESOURCE_MEM | IORESOURCE_BUSY,
};
-static unsigned int calibration_result;
+static unsigned int apic_calibration_res;
static int lapic_next_event(unsigned long delta,
struct clock_event_device *evt);
@@ -431,7 +431,7 @@ static void lapic_timer_setup(enum clock
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
case CLOCK_EVT_MODE_ONESHOT:
- __setup_APIC_LVTT(calibration_result,
+ __setup_APIC_LVTT(apic_calibration_res,
mode != CLOCK_EVT_MODE_PERIODIC, 1);
break;
case CLOCK_EVT_MODE_UNUSED:
@@ -590,13 +590,46 @@ calibrate_by_pmtimer(long deltapm, long
return 0;
}
+static void __init initialize_lapic_clkevt(long delta)
+{
+ /* Calculate the scaled math multiplication factor */
+ lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
+ lapic_clockevent.shift);
+ lapic_clockevent.max_delta_ns =
+ clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
+ lapic_clockevent.min_delta_ns =
+ clockevent_delta2ns(0xF, &lapic_clockevent);
+}
+
static int __init calibrate_APIC_clock(void)
{
+ apic_calibration_res = x86_platform.calibrate_apic();
+ if (apic_calibration_res) {
+ struct clock_event_device *levt = &__get_cpu_var(lapic_events);
+ long delta;
+
+ if (lapic_clockevent.mult)
+ return 0;
+
+ delta = (apic_calibration_res * LAPIC_CAL_LOOPS) / APIC_DIVISOR;
+ initialize_lapic_clkevt(delta);
+ levt->features &= ~CLOCK_EVT_FEAT_DUMMY;
+ return 0;
+ } else {
+ pr_warning("Unable to calibrate APIC frequency, "
+ "disabling apic timer\n");
+ return -1;
+ }
+}
+
+unsigned int __init native_calibrate_apic(void)
+{
struct clock_event_device *levt = &__get_cpu_var(lapic_events);
void (*real_handler)(struct clock_event_device *dev);
unsigned long deltaj;
long delta, deltatsc;
int pm_referenced = 0;
+ unsigned int calibration_result;
local_irq_disable();
@@ -631,14 +664,7 @@ static int __init calibrate_APIC_clock(v
pm_referenced = !calibrate_by_pmtimer(lapic_cal_pm2 - lapic_cal_pm1,
&delta, &deltatsc);
- /* Calculate the scaled math multiplication factor */
- lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
- lapic_clockevent.shift);
- lapic_clockevent.max_delta_ns =
- clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
- lapic_clockevent.min_delta_ns =
- clockevent_delta2ns(0xF, &lapic_clockevent);
-
+ initialize_lapic_clkevt(delta);
calibration_result = (delta * APIC_DIVISOR) / LAPIC_CAL_LOOPS;
apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta);
@@ -664,7 +690,7 @@ static int __init calibrate_APIC_clock(v
if (calibration_result < (1000000 / HZ)) {
local_irq_enable();
pr_warning("APIC frequency too slow, disabling apic timer\n");
- return -1;
+ return 0;
}
levt->features &= ~CLOCK_EVT_FEAT_DUMMY;
@@ -706,10 +732,10 @@ static int __init calibrate_APIC_clock(v
if (levt->features & CLOCK_EVT_FEAT_DUMMY) {
pr_warning("APIC timer disabled due to verification failure\n");
- return -1;
+ return 0;
}
- return 0;
+ return calibration_result;
}
/*
Index: linux-x86-tree.git/arch/x86/kernel/cpu/vmware.c
===================================================================
--- linux-x86-tree.git.orig/arch/x86/kernel/cpu/vmware.c 2010-08-17 15:29:21.000000000 -0700
+++ linux-x86-tree.git/arch/x86/kernel/cpu/vmware.c 2010-08-18 10:20:21.000000000 -0700
@@ -72,17 +72,33 @@ static unsigned long vmware_get_tsc_khz(
return tsc_hz;
}
+static unsigned int vmware_calibrate_apic(void)
+{
+ unsigned int calibration_result;
+ uint32_t eax, ebx, ecx, edx;
+
+ VMWARE_PORT(GETHZ, eax, ebx, ecx, edx);
+ BUG_ON(!ecx);
+ calibration_result = ecx / HZ;
+
+ printk(KERN_INFO "APIC bus freq read from hypervisor : %u.%03u MHz\n",
+ calibration_result / (1000000 / HZ),
+ calibration_result % (1000000 / HZ));
+ return calibration_result;
+}
+
static void __init vmware_platform_setup(void)
{
uint32_t eax, ebx, ecx, edx;
VMWARE_PORT(GETHZ, eax, ebx, ecx, edx);
- if (ebx != UINT_MAX)
+ if (ebx != UINT_MAX) {
x86_platform.calibrate_tsc = vmware_get_tsc_khz;
- else
+ x86_platform.calibrate_apic = vmware_calibrate_apic;
+ } else
printk(KERN_WARNING
- "Failed to get TSC freq from the hypervisor\n");
+ "Failed to setup VMware hypervisor platform\n");
}
/*
Index: linux-x86-tree.git/arch/x86/kernel/x86_init.c
===================================================================
--- linux-x86-tree.git.orig/arch/x86/kernel/x86_init.c 2010-08-17 15:29:21.000000000 -0700
+++ linux-x86-tree.git/arch/x86/kernel/x86_init.c 2010-08-17 16:44:20.000000000 -0700
@@ -95,7 +95,8 @@ struct x86_platform_ops x86_platform = {
.iommu_shutdown = iommu_shutdown_noop,
.is_untracked_pat_range = is_ISA_range,
.nmi_init = default_nmi_init,
- .i8042_detect = default_i8042_detect
+ .i8042_detect = default_i8042_detect,
+ .calibrate_apic = native_calibrate_apic
};
EXPORT_SYMBOL_GPL(x86_platform);
On Wed, 2010-08-18 at 10:41 -0700, Alok Kataria wrote:
> Add a new function pointer calibrate_apic to x86_platform_ops.
I guess I should move this in init_ops too, anything else that needs to
be changed ?
Thanks,
Alok
> On native this
> does the usual apic calibration. On VMware's platform we override it with a
> routine which gets that information from the hypervisor.
>
> Signed-off-by: Alok N Kataria <[email protected]>
> Cc: H. Peter Anvin <[email protected]>
>
> Index: linux-x86-tree.git/arch/x86/include/asm/apic.h
> ===================================================================
> --- linux-x86-tree.git.orig/arch/x86/include/asm/apic.h 2010-08-17 15:29:21.000000000 -0700
> +++ linux-x86-tree.git/arch/x86/include/asm/apic.h 2010-08-17 15:32:11.000000000 -0700
> @@ -238,6 +238,7 @@ extern void setup_boot_APIC_clock(void);
> extern void setup_secondary_APIC_clock(void);
> extern int APIC_init_uniprocessor(void);
> extern void enable_NMI_through_LVT0(void);
> +extern unsigned int native_calibrate_apic(void);
>
> /*
> * On 32bit this is mach-xxx local
> Index: linux-x86-tree.git/arch/x86/include/asm/x86_init.h
> ===================================================================
> --- linux-x86-tree.git.orig/arch/x86/include/asm/x86_init.h 2010-08-17 15:29:21.000000000 -0700
> +++ linux-x86-tree.git/arch/x86/include/asm/x86_init.h 2010-08-18 10:20:21.000000000 -0700
> @@ -143,6 +143,7 @@ struct x86_cpuinit_ops {
> * @is_untracked_pat_range exclude from PAT logic
> * @nmi_init enable NMI on cpus
> * @i8042_detect pre-detect if i8042 controller exists
> + * @calibrate_apic: calibrate APIC bus freq
> */
> struct x86_platform_ops {
> unsigned long (*calibrate_tsc)(void);
> @@ -152,6 +153,7 @@ struct x86_platform_ops {
> bool (*is_untracked_pat_range)(u64 start, u64 end);
> void (*nmi_init)(void);
> int (*i8042_detect)(void);
> + unsigned int (*calibrate_apic)(void);
> };
>
> extern struct x86_init_ops x86_init;
> Index: linux-x86-tree.git/arch/x86/kernel/apic/apic.c
> ===================================================================
> --- linux-x86-tree.git.orig/arch/x86/kernel/apic/apic.c 2010-08-17 15:29:21.000000000 -0700
> +++ linux-x86-tree.git/arch/x86/kernel/apic/apic.c 2010-08-18 10:20:55.000000000 -0700
> @@ -176,7 +176,7 @@ static struct resource lapic_resource =
> .flags = IORESOURCE_MEM | IORESOURCE_BUSY,
> };
>
> -static unsigned int calibration_result;
> +static unsigned int apic_calibration_res;
>
> static int lapic_next_event(unsigned long delta,
> struct clock_event_device *evt);
> @@ -431,7 +431,7 @@ static void lapic_timer_setup(enum clock
> switch (mode) {
> case CLOCK_EVT_MODE_PERIODIC:
> case CLOCK_EVT_MODE_ONESHOT:
> - __setup_APIC_LVTT(calibration_result,
> + __setup_APIC_LVTT(apic_calibration_res,
> mode != CLOCK_EVT_MODE_PERIODIC, 1);
> break;
> case CLOCK_EVT_MODE_UNUSED:
> @@ -590,13 +590,46 @@ calibrate_by_pmtimer(long deltapm, long
> return 0;
> }
>
> +static void __init initialize_lapic_clkevt(long delta)
> +{
> + /* Calculate the scaled math multiplication factor */
> + lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
> + lapic_clockevent.shift);
> + lapic_clockevent.max_delta_ns =
> + clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
> + lapic_clockevent.min_delta_ns =
> + clockevent_delta2ns(0xF, &lapic_clockevent);
> +}
> +
> static int __init calibrate_APIC_clock(void)
> {
> + apic_calibration_res = x86_platform.calibrate_apic();
> + if (apic_calibration_res) {
> + struct clock_event_device *levt = &__get_cpu_var(lapic_events);
> + long delta;
> +
> + if (lapic_clockevent.mult)
> + return 0;
> +
> + delta = (apic_calibration_res * LAPIC_CAL_LOOPS) / APIC_DIVISOR;
> + initialize_lapic_clkevt(delta);
> + levt->features &= ~CLOCK_EVT_FEAT_DUMMY;
> + return 0;
> + } else {
> + pr_warning("Unable to calibrate APIC frequency, "
> + "disabling apic timer\n");
> + return -1;
> + }
> +}
> +
> +unsigned int __init native_calibrate_apic(void)
> +{
> struct clock_event_device *levt = &__get_cpu_var(lapic_events);
> void (*real_handler)(struct clock_event_device *dev);
> unsigned long deltaj;
> long delta, deltatsc;
> int pm_referenced = 0;
> + unsigned int calibration_result;
>
> local_irq_disable();
>
> @@ -631,14 +664,7 @@ static int __init calibrate_APIC_clock(v
> pm_referenced = !calibrate_by_pmtimer(lapic_cal_pm2 - lapic_cal_pm1,
> &delta, &deltatsc);
>
> - /* Calculate the scaled math multiplication factor */
> - lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
> - lapic_clockevent.shift);
> - lapic_clockevent.max_delta_ns =
> - clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
> - lapic_clockevent.min_delta_ns =
> - clockevent_delta2ns(0xF, &lapic_clockevent);
> -
> + initialize_lapic_clkevt(delta);
> calibration_result = (delta * APIC_DIVISOR) / LAPIC_CAL_LOOPS;
>
> apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta);
> @@ -664,7 +690,7 @@ static int __init calibrate_APIC_clock(v
> if (calibration_result < (1000000 / HZ)) {
> local_irq_enable();
> pr_warning("APIC frequency too slow, disabling apic timer\n");
> - return -1;
> + return 0;
> }
>
> levt->features &= ~CLOCK_EVT_FEAT_DUMMY;
> @@ -706,10 +732,10 @@ static int __init calibrate_APIC_clock(v
>
> if (levt->features & CLOCK_EVT_FEAT_DUMMY) {
> pr_warning("APIC timer disabled due to verification failure\n");
> - return -1;
> + return 0;
> }
>
> - return 0;
> + return calibration_result;
> }
>
> /*
> Index: linux-x86-tree.git/arch/x86/kernel/cpu/vmware.c
> ===================================================================
> --- linux-x86-tree.git.orig/arch/x86/kernel/cpu/vmware.c 2010-08-17 15:29:21.000000000 -0700
> +++ linux-x86-tree.git/arch/x86/kernel/cpu/vmware.c 2010-08-18 10:20:21.000000000 -0700
> @@ -72,17 +72,33 @@ static unsigned long vmware_get_tsc_khz(
> return tsc_hz;
> }
>
> +static unsigned int vmware_calibrate_apic(void)
> +{
> + unsigned int calibration_result;
> + uint32_t eax, ebx, ecx, edx;
> +
> + VMWARE_PORT(GETHZ, eax, ebx, ecx, edx);
> + BUG_ON(!ecx);
> + calibration_result = ecx / HZ;
> +
> + printk(KERN_INFO "APIC bus freq read from hypervisor : %u.%03u MHz\n",
> + calibration_result / (1000000 / HZ),
> + calibration_result % (1000000 / HZ));
> + return calibration_result;
> +}
> +
> static void __init vmware_platform_setup(void)
> {
> uint32_t eax, ebx, ecx, edx;
>
> VMWARE_PORT(GETHZ, eax, ebx, ecx, edx);
>
> - if (ebx != UINT_MAX)
> + if (ebx != UINT_MAX) {
> x86_platform.calibrate_tsc = vmware_get_tsc_khz;
> - else
> + x86_platform.calibrate_apic = vmware_calibrate_apic;
> + } else
> printk(KERN_WARNING
> - "Failed to get TSC freq from the hypervisor\n");
> + "Failed to setup VMware hypervisor platform\n");
> }
>
> /*
> Index: linux-x86-tree.git/arch/x86/kernel/x86_init.c
> ===================================================================
> --- linux-x86-tree.git.orig/arch/x86/kernel/x86_init.c 2010-08-17 15:29:21.000000000 -0700
> +++ linux-x86-tree.git/arch/x86/kernel/x86_init.c 2010-08-17 16:44:20.000000000 -0700
> @@ -95,7 +95,8 @@ struct x86_platform_ops x86_platform = {
> .iommu_shutdown = iommu_shutdown_noop,
> .is_untracked_pat_range = is_ISA_range,
> .nmi_init = default_nmi_init,
> - .i8042_detect = default_i8042_detect
> + .i8042_detect = default_i8042_detect,
> + .calibrate_apic = native_calibrate_apic
> };
>
> EXPORT_SYMBOL_GPL(x86_platform);
>
Here is the patch which adds this hook in the x86_init_ops.timers
structure.
---
Add a new function ptr calibrate_apic to x86_init_ops structure. On native this
does the usual apic calibration. On VMware's platform we override it with a
routine which gets that information from the hypervisor.
Signed-off-by: Alok N Kataria <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Index: linux-x86-tree.git/arch/x86/include/asm/apic.h
===================================================================
--- linux-x86-tree.git.orig/arch/x86/include/asm/apic.h 2010-08-17 15:29:21.000000000 -0700
+++ linux-x86-tree.git/arch/x86/include/asm/apic.h 2010-08-17 15:32:11.000000000 -0700
@@ -238,6 +238,7 @@ extern void setup_boot_APIC_clock(void);
extern void setup_secondary_APIC_clock(void);
extern int APIC_init_uniprocessor(void);
extern void enable_NMI_through_LVT0(void);
+extern unsigned int native_calibrate_apic(void);
/*
* On 32bit this is mach-xxx local
Index: linux-x86-tree.git/arch/x86/include/asm/x86_init.h
===================================================================
--- linux-x86-tree.git.orig/arch/x86/include/asm/x86_init.h 2010-08-17 15:29:21.000000000 -0700
+++ linux-x86-tree.git/arch/x86/include/asm/x86_init.h 2010-08-18 12:01:35.000000000 -0700
@@ -83,11 +83,13 @@ struct x86_init_paging {
* boot cpu
* @tsc_pre_init: platform function called before TSC init
* @timer_init: initialize the platform timer (default PIT/HPET)
+ * @calibrate_apic: calibrate APIC bus freq
*/
struct x86_init_timers {
void (*setup_percpu_clockev)(void);
void (*tsc_pre_init)(void);
void (*timer_init)(void);
+ unsigned int (*calibrate_apic)(void);
};
/**
Index: linux-x86-tree.git/arch/x86/kernel/apic/apic.c
===================================================================
--- linux-x86-tree.git.orig/arch/x86/kernel/apic/apic.c 2010-08-17 15:29:21.000000000 -0700
+++ linux-x86-tree.git/arch/x86/kernel/apic/apic.c 2010-08-18 12:05:33.000000000 -0700
@@ -176,7 +176,7 @@ static struct resource lapic_resource =
.flags = IORESOURCE_MEM | IORESOURCE_BUSY,
};
-static unsigned int calibration_result;
+static unsigned int apic_calibration_res;
static int lapic_next_event(unsigned long delta,
struct clock_event_device *evt);
@@ -431,7 +431,7 @@ static void lapic_timer_setup(enum clock
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
case CLOCK_EVT_MODE_ONESHOT:
- __setup_APIC_LVTT(calibration_result,
+ __setup_APIC_LVTT(apic_calibration_res,
mode != CLOCK_EVT_MODE_PERIODIC, 1);
break;
case CLOCK_EVT_MODE_UNUSED:
@@ -590,13 +590,46 @@ calibrate_by_pmtimer(long deltapm, long
return 0;
}
+static void __init initialize_lapic_clkevt(long delta)
+{
+ /* Calculate the scaled math multiplication factor */
+ lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
+ lapic_clockevent.shift);
+ lapic_clockevent.max_delta_ns =
+ clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
+ lapic_clockevent.min_delta_ns =
+ clockevent_delta2ns(0xF, &lapic_clockevent);
+}
+
static int __init calibrate_APIC_clock(void)
{
+ apic_calibration_res = x86_init.timers.calibrate_apic();
+ if (apic_calibration_res) {
+ struct clock_event_device *levt = &__get_cpu_var(lapic_events);
+ long delta;
+
+ if (lapic_clockevent.mult)
+ return 0;
+
+ delta = (apic_calibration_res * LAPIC_CAL_LOOPS) / APIC_DIVISOR;
+ initialize_lapic_clkevt(delta);
+ levt->features &= ~CLOCK_EVT_FEAT_DUMMY;
+ return 0;
+ } else {
+ pr_warning("Unable to calibrate APIC frequency, "
+ "disabling apic timer\n");
+ return -1;
+ }
+}
+
+unsigned int __init native_calibrate_apic(void)
+{
struct clock_event_device *levt = &__get_cpu_var(lapic_events);
void (*real_handler)(struct clock_event_device *dev);
unsigned long deltaj;
long delta, deltatsc;
int pm_referenced = 0;
+ unsigned int calibration_result;
local_irq_disable();
@@ -631,14 +664,7 @@ static int __init calibrate_APIC_clock(v
pm_referenced = !calibrate_by_pmtimer(lapic_cal_pm2 - lapic_cal_pm1,
&delta, &deltatsc);
- /* Calculate the scaled math multiplication factor */
- lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
- lapic_clockevent.shift);
- lapic_clockevent.max_delta_ns =
- clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
- lapic_clockevent.min_delta_ns =
- clockevent_delta2ns(0xF, &lapic_clockevent);
-
+ initialize_lapic_clkevt(delta);
calibration_result = (delta * APIC_DIVISOR) / LAPIC_CAL_LOOPS;
apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta);
@@ -664,7 +690,7 @@ static int __init calibrate_APIC_clock(v
if (calibration_result < (1000000 / HZ)) {
local_irq_enable();
pr_warning("APIC frequency too slow, disabling apic timer\n");
- return -1;
+ return 0;
}
levt->features &= ~CLOCK_EVT_FEAT_DUMMY;
@@ -706,10 +732,10 @@ static int __init calibrate_APIC_clock(v
if (levt->features & CLOCK_EVT_FEAT_DUMMY) {
pr_warning("APIC timer disabled due to verification failure\n");
- return -1;
+ return 0;
}
- return 0;
+ return calibration_result;
}
/*
Index: linux-x86-tree.git/arch/x86/kernel/cpu/vmware.c
===================================================================
--- linux-x86-tree.git.orig/arch/x86/kernel/cpu/vmware.c 2010-08-17 15:29:21.000000000 -0700
+++ linux-x86-tree.git/arch/x86/kernel/cpu/vmware.c 2010-08-18 12:24:57.000000000 -0700
@@ -72,17 +72,33 @@ static unsigned long vmware_get_tsc_khz(
return tsc_hz;
}
+static unsigned int __init vmware_calibrate_apic(void)
+{
+ unsigned int calibration_result;
+ uint32_t eax, ebx, ecx, edx;
+
+ VMWARE_PORT(GETHZ, eax, ebx, ecx, edx);
+ BUG_ON(!ecx);
+ calibration_result = ecx / HZ;
+
+ printk(KERN_INFO "APIC bus freq read from hypervisor : %u.%03u MHz\n",
+ calibration_result / (1000000 / HZ),
+ calibration_result % (1000000 / HZ));
+ return calibration_result;
+}
+
static void __init vmware_platform_setup(void)
{
uint32_t eax, ebx, ecx, edx;
VMWARE_PORT(GETHZ, eax, ebx, ecx, edx);
- if (ebx != UINT_MAX)
+ if (ebx != UINT_MAX) {
x86_platform.calibrate_tsc = vmware_get_tsc_khz;
- else
+ x86_init.timers.calibrate_apic = vmware_calibrate_apic;
+ } else
printk(KERN_WARNING
- "Failed to get TSC freq from the hypervisor\n");
+ "Failed to setup VMware hypervisor platform\n");
}
/*
Index: linux-x86-tree.git/arch/x86/kernel/x86_init.c
===================================================================
--- linux-x86-tree.git.orig/arch/x86/kernel/x86_init.c 2010-08-17 15:29:21.000000000 -0700
+++ linux-x86-tree.git/arch/x86/kernel/x86_init.c 2010-08-18 12:00:09.000000000 -0700
@@ -68,6 +68,7 @@ struct x86_init_ops x86_init __initdata
.setup_percpu_clockev = setup_boot_APIC_clock,
.tsc_pre_init = x86_init_noop,
.timer_init = hpet_time_init,
+ .calibrate_apic = native_calibrate_apic
},
.iommu = {
@@ -95,7 +96,7 @@ struct x86_platform_ops x86_platform = {
.iommu_shutdown = iommu_shutdown_noop,
.is_untracked_pat_range = is_ISA_range,
.nmi_init = default_nmi_init,
- .i8042_detect = default_i8042_detect
+ .i8042_detect = default_i8042_detect,
};
EXPORT_SYMBOL_GPL(x86_platform);
On Wed, 2010-08-18 at 10:41 -0700, Alok Kataria wrote:
> Add a new function pointer calibrate_apic to x86_platform_ops. On native this
> does the usual apic calibration. On VMware's platform we override it with a
> routine which gets that information from the hypervisor.
>
> Signed-off-by: Alok N Kataria <[email protected]>
> Cc: H. Peter Anvin <[email protected]>
>
> Index: linux-x86-tree.git/arch/x86/include/asm/apic.h
> ===================================================================
> --- linux-x86-tree.git.orig/arch/x86/include/asm/apic.h 2010-08-17 15:29:21.000000000 -0700
> +++ linux-x86-tree.git/arch/x86/include/asm/apic.h 2010-08-17 15:32:11.000000000 -0700
> @@ -238,6 +238,7 @@ extern void setup_boot_APIC_clock(void);
> extern void setup_secondary_APIC_clock(void);
> extern int APIC_init_uniprocessor(void);
> extern void enable_NMI_through_LVT0(void);
> +extern unsigned int native_calibrate_apic(void);
>
> /*
> * On 32bit this is mach-xxx local
> Index: linux-x86-tree.git/arch/x86/include/asm/x86_init.h
> ===================================================================
> --- linux-x86-tree.git.orig/arch/x86/include/asm/x86_init.h 2010-08-17 15:29:21.000000000 -0700
> +++ linux-x86-tree.git/arch/x86/include/asm/x86_init.h 2010-08-18 10:20:21.000000000 -0700
> @@ -143,6 +143,7 @@ struct x86_cpuinit_ops {
> * @is_untracked_pat_range exclude from PAT logic
> * @nmi_init enable NMI on cpus
> * @i8042_detect pre-detect if i8042 controller exists
> + * @calibrate_apic: calibrate APIC bus freq
> */
> struct x86_platform_ops {
> unsigned long (*calibrate_tsc)(void);
> @@ -152,6 +153,7 @@ struct x86_platform_ops {
> bool (*is_untracked_pat_range)(u64 start, u64 end);
> void (*nmi_init)(void);
> int (*i8042_detect)(void);
> + unsigned int (*calibrate_apic)(void);
> };
>
> extern struct x86_init_ops x86_init;
> Index: linux-x86-tree.git/arch/x86/kernel/apic/apic.c
> ===================================================================
> --- linux-x86-tree.git.orig/arch/x86/kernel/apic/apic.c 2010-08-17 15:29:21.000000000 -0700
> +++ linux-x86-tree.git/arch/x86/kernel/apic/apic.c 2010-08-18 10:20:55.000000000 -0700
> @@ -176,7 +176,7 @@ static struct resource lapic_resource =
> .flags = IORESOURCE_MEM | IORESOURCE_BUSY,
> };
>
> -static unsigned int calibration_result;
> +static unsigned int apic_calibration_res;
>
> static int lapic_next_event(unsigned long delta,
> struct clock_event_device *evt);
> @@ -431,7 +431,7 @@ static void lapic_timer_setup(enum clock
> switch (mode) {
> case CLOCK_EVT_MODE_PERIODIC:
> case CLOCK_EVT_MODE_ONESHOT:
> - __setup_APIC_LVTT(calibration_result,
> + __setup_APIC_LVTT(apic_calibration_res,
> mode != CLOCK_EVT_MODE_PERIODIC, 1);
> break;
> case CLOCK_EVT_MODE_UNUSED:
> @@ -590,13 +590,46 @@ calibrate_by_pmtimer(long deltapm, long
> return 0;
> }
>
> +static void __init initialize_lapic_clkevt(long delta)
> +{
> + /* Calculate the scaled math multiplication factor */
> + lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
> + lapic_clockevent.shift);
> + lapic_clockevent.max_delta_ns =
> + clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
> + lapic_clockevent.min_delta_ns =
> + clockevent_delta2ns(0xF, &lapic_clockevent);
> +}
> +
> static int __init calibrate_APIC_clock(void)
> {
> + apic_calibration_res = x86_platform.calibrate_apic();
> + if (apic_calibration_res) {
> + struct clock_event_device *levt = &__get_cpu_var(lapic_events);
> + long delta;
> +
> + if (lapic_clockevent.mult)
> + return 0;
> +
> + delta = (apic_calibration_res * LAPIC_CAL_LOOPS) / APIC_DIVISOR;
> + initialize_lapic_clkevt(delta);
> + levt->features &= ~CLOCK_EVT_FEAT_DUMMY;
> + return 0;
> + } else {
> + pr_warning("Unable to calibrate APIC frequency, "
> + "disabling apic timer\n");
> + return -1;
> + }
> +}
> +
> +unsigned int __init native_calibrate_apic(void)
> +{
> struct clock_event_device *levt = &__get_cpu_var(lapic_events);
> void (*real_handler)(struct clock_event_device *dev);
> unsigned long deltaj;
> long delta, deltatsc;
> int pm_referenced = 0;
> + unsigned int calibration_result;
>
> local_irq_disable();
>
> @@ -631,14 +664,7 @@ static int __init calibrate_APIC_clock(v
> pm_referenced = !calibrate_by_pmtimer(lapic_cal_pm2 - lapic_cal_pm1,
> &delta, &deltatsc);
>
> - /* Calculate the scaled math multiplication factor */
> - lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
> - lapic_clockevent.shift);
> - lapic_clockevent.max_delta_ns =
> - clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
> - lapic_clockevent.min_delta_ns =
> - clockevent_delta2ns(0xF, &lapic_clockevent);
> -
> + initialize_lapic_clkevt(delta);
> calibration_result = (delta * APIC_DIVISOR) / LAPIC_CAL_LOOPS;
>
> apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta);
> @@ -664,7 +690,7 @@ static int __init calibrate_APIC_clock(v
> if (calibration_result < (1000000 / HZ)) {
> local_irq_enable();
> pr_warning("APIC frequency too slow, disabling apic timer\n");
> - return -1;
> + return 0;
> }
>
> levt->features &= ~CLOCK_EVT_FEAT_DUMMY;
> @@ -706,10 +732,10 @@ static int __init calibrate_APIC_clock(v
>
> if (levt->features & CLOCK_EVT_FEAT_DUMMY) {
> pr_warning("APIC timer disabled due to verification failure\n");
> - return -1;
> + return 0;
> }
>
> - return 0;
> + return calibration_result;
> }
>
> /*
> Index: linux-x86-tree.git/arch/x86/kernel/cpu/vmware.c
> ===================================================================
> --- linux-x86-tree.git.orig/arch/x86/kernel/cpu/vmware.c 2010-08-17 15:29:21.000000000 -0700
> +++ linux-x86-tree.git/arch/x86/kernel/cpu/vmware.c 2010-08-18 10:20:21.000000000 -0700
> @@ -72,17 +72,33 @@ static unsigned long vmware_get_tsc_khz(
> return tsc_hz;
> }
>
> +static unsigned int vmware_calibrate_apic(void)
> +{
> + unsigned int calibration_result;
> + uint32_t eax, ebx, ecx, edx;
> +
> + VMWARE_PORT(GETHZ, eax, ebx, ecx, edx);
> + BUG_ON(!ecx);
> + calibration_result = ecx / HZ;
> +
> + printk(KERN_INFO "APIC bus freq read from hypervisor : %u.%03u MHz\n",
> + calibration_result / (1000000 / HZ),
> + calibration_result % (1000000 / HZ));
> + return calibration_result;
> +}
> +
> static void __init vmware_platform_setup(void)
> {
> uint32_t eax, ebx, ecx, edx;
>
> VMWARE_PORT(GETHZ, eax, ebx, ecx, edx);
>
> - if (ebx != UINT_MAX)
> + if (ebx != UINT_MAX) {
> x86_platform.calibrate_tsc = vmware_get_tsc_khz;
> - else
> + x86_platform.calibrate_apic = vmware_calibrate_apic;
> + } else
> printk(KERN_WARNING
> - "Failed to get TSC freq from the hypervisor\n");
> + "Failed to setup VMware hypervisor platform\n");
> }
>
> /*
> Index: linux-x86-tree.git/arch/x86/kernel/x86_init.c
> ===================================================================
> --- linux-x86-tree.git.orig/arch/x86/kernel/x86_init.c 2010-08-17 15:29:21.000000000 -0700
> +++ linux-x86-tree.git/arch/x86/kernel/x86_init.c 2010-08-17 16:44:20.000000000 -0700
> @@ -95,7 +95,8 @@ struct x86_platform_ops x86_platform = {
> .iommu_shutdown = iommu_shutdown_noop,
> .is_untracked_pat_range = is_ISA_range,
> .nmi_init = default_nmi_init,
> - .i8042_detect = default_i8042_detect
> + .i8042_detect = default_i8042_detect,
> + .calibrate_apic = native_calibrate_apic
> };
>
> EXPORT_SYMBOL_GPL(x86_platform);
>
On Wed, 2010-08-18 at 12:27 -0700, Alok Kataria wrote:
> Here is the patch which adds this hook in the x86_init_ops.timers
> structure.
>
> ---
> Add a new function ptr calibrate_apic to x86_init_ops structure. On native this
> does the usual apic calibration. On VMware's platform we override it with a
> routine which gets that information from the hypervisor.
>
Any comments on this one ?
Thanks in advance.
Alok
> Signed-off-by: Alok N Kataria <[email protected]>
> Cc: H. Peter Anvin <[email protected]>
>
> Index: linux-x86-tree.git/arch/x86/include/asm/apic.h
> ===================================================================
> --- linux-x86-tree.git.orig/arch/x86/include/asm/apic.h 2010-08-17 15:29:21.000000000 -0700
> +++ linux-x86-tree.git/arch/x86/include/asm/apic.h 2010-08-17 15:32:11.000000000 -0700
> @@ -238,6 +238,7 @@ extern void setup_boot_APIC_clock(void);
> extern void setup_secondary_APIC_clock(void);
> extern int APIC_init_uniprocessor(void);
> extern void enable_NMI_through_LVT0(void);
> +extern unsigned int native_calibrate_apic(void);
>
> /*
> * On 32bit this is mach-xxx local
> Index: linux-x86-tree.git/arch/x86/include/asm/x86_init.h
> ===================================================================
> --- linux-x86-tree.git.orig/arch/x86/include/asm/x86_init.h 2010-08-17 15:29:21.000000000 -0700
> +++ linux-x86-tree.git/arch/x86/include/asm/x86_init.h 2010-08-18 12:01:35.000000000 -0700
> @@ -83,11 +83,13 @@ struct x86_init_paging {
> * boot cpu
> * @tsc_pre_init: platform function called before TSC init
> * @timer_init: initialize the platform timer (default PIT/HPET)
> + * @calibrate_apic: calibrate APIC bus freq
> */
> struct x86_init_timers {
> void (*setup_percpu_clockev)(void);
> void (*tsc_pre_init)(void);
> void (*timer_init)(void);
> + unsigned int (*calibrate_apic)(void);
> };
>
> /**
> Index: linux-x86-tree.git/arch/x86/kernel/apic/apic.c
> ===================================================================
> --- linux-x86-tree.git.orig/arch/x86/kernel/apic/apic.c 2010-08-17 15:29:21.000000000 -0700
> +++ linux-x86-tree.git/arch/x86/kernel/apic/apic.c 2010-08-18 12:05:33.000000000 -0700
> @@ -176,7 +176,7 @@ static struct resource lapic_resource =
> .flags = IORESOURCE_MEM | IORESOURCE_BUSY,
> };
>
> -static unsigned int calibration_result;
> +static unsigned int apic_calibration_res;
>
> static int lapic_next_event(unsigned long delta,
> struct clock_event_device *evt);
> @@ -431,7 +431,7 @@ static void lapic_timer_setup(enum clock
> switch (mode) {
> case CLOCK_EVT_MODE_PERIODIC:
> case CLOCK_EVT_MODE_ONESHOT:
> - __setup_APIC_LVTT(calibration_result,
> + __setup_APIC_LVTT(apic_calibration_res,
> mode != CLOCK_EVT_MODE_PERIODIC, 1);
> break;
> case CLOCK_EVT_MODE_UNUSED:
> @@ -590,13 +590,46 @@ calibrate_by_pmtimer(long deltapm, long
> return 0;
> }
>
> +static void __init initialize_lapic_clkevt(long delta)
> +{
> + /* Calculate the scaled math multiplication factor */
> + lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
> + lapic_clockevent.shift);
> + lapic_clockevent.max_delta_ns =
> + clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
> + lapic_clockevent.min_delta_ns =
> + clockevent_delta2ns(0xF, &lapic_clockevent);
> +}
> +
> static int __init calibrate_APIC_clock(void)
> {
> + apic_calibration_res = x86_init.timers.calibrate_apic();
> + if (apic_calibration_res) {
> + struct clock_event_device *levt = &__get_cpu_var(lapic_events);
> + long delta;
> +
> + if (lapic_clockevent.mult)
> + return 0;
> +
> + delta = (apic_calibration_res * LAPIC_CAL_LOOPS) / APIC_DIVISOR;
> + initialize_lapic_clkevt(delta);
> + levt->features &= ~CLOCK_EVT_FEAT_DUMMY;
> + return 0;
> + } else {
> + pr_warning("Unable to calibrate APIC frequency, "
> + "disabling apic timer\n");
> + return -1;
> + }
> +}
> +
> +unsigned int __init native_calibrate_apic(void)
> +{
> struct clock_event_device *levt = &__get_cpu_var(lapic_events);
> void (*real_handler)(struct clock_event_device *dev);
> unsigned long deltaj;
> long delta, deltatsc;
> int pm_referenced = 0;
> + unsigned int calibration_result;
>
> local_irq_disable();
>
> @@ -631,14 +664,7 @@ static int __init calibrate_APIC_clock(v
> pm_referenced = !calibrate_by_pmtimer(lapic_cal_pm2 - lapic_cal_pm1,
> &delta, &deltatsc);
>
> - /* Calculate the scaled math multiplication factor */
> - lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
> - lapic_clockevent.shift);
> - lapic_clockevent.max_delta_ns =
> - clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
> - lapic_clockevent.min_delta_ns =
> - clockevent_delta2ns(0xF, &lapic_clockevent);
> -
> + initialize_lapic_clkevt(delta);
> calibration_result = (delta * APIC_DIVISOR) / LAPIC_CAL_LOOPS;
>
> apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta);
> @@ -664,7 +690,7 @@ static int __init calibrate_APIC_clock(v
> if (calibration_result < (1000000 / HZ)) {
> local_irq_enable();
> pr_warning("APIC frequency too slow, disabling apic timer\n");
> - return -1;
> + return 0;
> }
>
> levt->features &= ~CLOCK_EVT_FEAT_DUMMY;
> @@ -706,10 +732,10 @@ static int __init calibrate_APIC_clock(v
>
> if (levt->features & CLOCK_EVT_FEAT_DUMMY) {
> pr_warning("APIC timer disabled due to verification failure\n");
> - return -1;
> + return 0;
> }
>
> - return 0;
> + return calibration_result;
> }
>
> /*
> Index: linux-x86-tree.git/arch/x86/kernel/cpu/vmware.c
> ===================================================================
> --- linux-x86-tree.git.orig/arch/x86/kernel/cpu/vmware.c 2010-08-17 15:29:21.000000000 -0700
> +++ linux-x86-tree.git/arch/x86/kernel/cpu/vmware.c 2010-08-18 12:24:57.000000000 -0700
> @@ -72,17 +72,33 @@ static unsigned long vmware_get_tsc_khz(
> return tsc_hz;
> }
>
> +static unsigned int __init vmware_calibrate_apic(void)
> +{
> + unsigned int calibration_result;
> + uint32_t eax, ebx, ecx, edx;
> +
> + VMWARE_PORT(GETHZ, eax, ebx, ecx, edx);
> + BUG_ON(!ecx);
> + calibration_result = ecx / HZ;
> +
> + printk(KERN_INFO "APIC bus freq read from hypervisor : %u.%03u MHz\n",
> + calibration_result / (1000000 / HZ),
> + calibration_result % (1000000 / HZ));
> + return calibration_result;
> +}
> +
> static void __init vmware_platform_setup(void)
> {
> uint32_t eax, ebx, ecx, edx;
>
> VMWARE_PORT(GETHZ, eax, ebx, ecx, edx);
>
> - if (ebx != UINT_MAX)
> + if (ebx != UINT_MAX) {
> x86_platform.calibrate_tsc = vmware_get_tsc_khz;
> - else
> + x86_init.timers.calibrate_apic = vmware_calibrate_apic;
> + } else
> printk(KERN_WARNING
> - "Failed to get TSC freq from the hypervisor\n");
> + "Failed to setup VMware hypervisor platform\n");
> }
>
> /*
> Index: linux-x86-tree.git/arch/x86/kernel/x86_init.c
> ===================================================================
> --- linux-x86-tree.git.orig/arch/x86/kernel/x86_init.c 2010-08-17 15:29:21.000000000 -0700
> +++ linux-x86-tree.git/arch/x86/kernel/x86_init.c 2010-08-18 12:00:09.000000000 -0700
> @@ -68,6 +68,7 @@ struct x86_init_ops x86_init __initdata
> .setup_percpu_clockev = setup_boot_APIC_clock,
> .tsc_pre_init = x86_init_noop,
> .timer_init = hpet_time_init,
> + .calibrate_apic = native_calibrate_apic
> },
>
> .iommu = {
> @@ -95,7 +96,7 @@ struct x86_platform_ops x86_platform = {
> .iommu_shutdown = iommu_shutdown_noop,
> .is_untracked_pat_range = is_ISA_range,
> .nmi_init = default_nmi_init,
> - .i8042_detect = default_i8042_detect
> + .i8042_detect = default_i8042_detect,
> };
>
> EXPORT_SYMBOL_GPL(x86_platform);
>
>
> On Wed, 2010-08-18 at 10:41 -0700, Alok Kataria wrote:
> > Add a new function pointer calibrate_apic to x86_platform_ops. On native this
> > does the usual apic calibration. On VMware's platform we override it with a
> > routine which gets that information from the hypervisor.
> >
> > Signed-off-by: Alok N Kataria <[email protected]>
> > Cc: H. Peter Anvin <[email protected]>
> >
> > Index: linux-x86-tree.git/arch/x86/include/asm/apic.h
> > ===================================================================
> > --- linux-x86-tree.git.orig/arch/x86/include/asm/apic.h 2010-08-17 15:29:21.000000000 -0700
> > +++ linux-x86-tree.git/arch/x86/include/asm/apic.h 2010-08-17 15:32:11.000000000 -0700
> > @@ -238,6 +238,7 @@ extern void setup_boot_APIC_clock(void);
> > extern void setup_secondary_APIC_clock(void);
> > extern int APIC_init_uniprocessor(void);
> > extern void enable_NMI_through_LVT0(void);
> > +extern unsigned int native_calibrate_apic(void);
> >
> > /*
> > * On 32bit this is mach-xxx local
> > Index: linux-x86-tree.git/arch/x86/include/asm/x86_init.h
> > ===================================================================
> > --- linux-x86-tree.git.orig/arch/x86/include/asm/x86_init.h 2010-08-17 15:29:21.000000000 -0700
> > +++ linux-x86-tree.git/arch/x86/include/asm/x86_init.h 2010-08-18 10:20:21.000000000 -0700
> > @@ -143,6 +143,7 @@ struct x86_cpuinit_ops {
> > * @is_untracked_pat_range exclude from PAT logic
> > * @nmi_init enable NMI on cpus
> > * @i8042_detect pre-detect if i8042 controller exists
> > + * @calibrate_apic: calibrate APIC bus freq
> > */
> > struct x86_platform_ops {
> > unsigned long (*calibrate_tsc)(void);
> > @@ -152,6 +153,7 @@ struct x86_platform_ops {
> > bool (*is_untracked_pat_range)(u64 start, u64 end);
> > void (*nmi_init)(void);
> > int (*i8042_detect)(void);
> > + unsigned int (*calibrate_apic)(void);
> > };
> >
> > extern struct x86_init_ops x86_init;
> > Index: linux-x86-tree.git/arch/x86/kernel/apic/apic.c
> > ===================================================================
> > --- linux-x86-tree.git.orig/arch/x86/kernel/apic/apic.c 2010-08-17 15:29:21.000000000 -0700
> > +++ linux-x86-tree.git/arch/x86/kernel/apic/apic.c 2010-08-18 10:20:55.000000000 -0700
> > @@ -176,7 +176,7 @@ static struct resource lapic_resource =
> > .flags = IORESOURCE_MEM | IORESOURCE_BUSY,
> > };
> >
> > -static unsigned int calibration_result;
> > +static unsigned int apic_calibration_res;
> >
> > static int lapic_next_event(unsigned long delta,
> > struct clock_event_device *evt);
> > @@ -431,7 +431,7 @@ static void lapic_timer_setup(enum clock
> > switch (mode) {
> > case CLOCK_EVT_MODE_PERIODIC:
> > case CLOCK_EVT_MODE_ONESHOT:
> > - __setup_APIC_LVTT(calibration_result,
> > + __setup_APIC_LVTT(apic_calibration_res,
> > mode != CLOCK_EVT_MODE_PERIODIC, 1);
> > break;
> > case CLOCK_EVT_MODE_UNUSED:
> > @@ -590,13 +590,46 @@ calibrate_by_pmtimer(long deltapm, long
> > return 0;
> > }
> >
> > +static void __init initialize_lapic_clkevt(long delta)
> > +{
> > + /* Calculate the scaled math multiplication factor */
> > + lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
> > + lapic_clockevent.shift);
> > + lapic_clockevent.max_delta_ns =
> > + clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
> > + lapic_clockevent.min_delta_ns =
> > + clockevent_delta2ns(0xF, &lapic_clockevent);
> > +}
> > +
> > static int __init calibrate_APIC_clock(void)
> > {
> > + apic_calibration_res = x86_platform.calibrate_apic();
> > + if (apic_calibration_res) {
> > + struct clock_event_device *levt = &__get_cpu_var(lapic_events);
> > + long delta;
> > +
> > + if (lapic_clockevent.mult)
> > + return 0;
> > +
> > + delta = (apic_calibration_res * LAPIC_CAL_LOOPS) / APIC_DIVISOR;
> > + initialize_lapic_clkevt(delta);
> > + levt->features &= ~CLOCK_EVT_FEAT_DUMMY;
> > + return 0;
> > + } else {
> > + pr_warning("Unable to calibrate APIC frequency, "
> > + "disabling apic timer\n");
> > + return -1;
> > + }
> > +}
> > +
> > +unsigned int __init native_calibrate_apic(void)
> > +{
> > struct clock_event_device *levt = &__get_cpu_var(lapic_events);
> > void (*real_handler)(struct clock_event_device *dev);
> > unsigned long deltaj;
> > long delta, deltatsc;
> > int pm_referenced = 0;
> > + unsigned int calibration_result;
> >
> > local_irq_disable();
> >
> > @@ -631,14 +664,7 @@ static int __init calibrate_APIC_clock(v
> > pm_referenced = !calibrate_by_pmtimer(lapic_cal_pm2 - lapic_cal_pm1,
> > &delta, &deltatsc);
> >
> > - /* Calculate the scaled math multiplication factor */
> > - lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
> > - lapic_clockevent.shift);
> > - lapic_clockevent.max_delta_ns =
> > - clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
> > - lapic_clockevent.min_delta_ns =
> > - clockevent_delta2ns(0xF, &lapic_clockevent);
> > -
> > + initialize_lapic_clkevt(delta);
> > calibration_result = (delta * APIC_DIVISOR) / LAPIC_CAL_LOOPS;
> >
> > apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta);
> > @@ -664,7 +690,7 @@ static int __init calibrate_APIC_clock(v
> > if (calibration_result < (1000000 / HZ)) {
> > local_irq_enable();
> > pr_warning("APIC frequency too slow, disabling apic timer\n");
> > - return -1;
> > + return 0;
> > }
> >
> > levt->features &= ~CLOCK_EVT_FEAT_DUMMY;
> > @@ -706,10 +732,10 @@ static int __init calibrate_APIC_clock(v
> >
> > if (levt->features & CLOCK_EVT_FEAT_DUMMY) {
> > pr_warning("APIC timer disabled due to verification failure\n");
> > - return -1;
> > + return 0;
> > }
> >
> > - return 0;
> > + return calibration_result;
> > }
> >
> > /*
> > Index: linux-x86-tree.git/arch/x86/kernel/cpu/vmware.c
> > ===================================================================
> > --- linux-x86-tree.git.orig/arch/x86/kernel/cpu/vmware.c 2010-08-17 15:29:21.000000000 -0700
> > +++ linux-x86-tree.git/arch/x86/kernel/cpu/vmware.c 2010-08-18 10:20:21.000000000 -0700
> > @@ -72,17 +72,33 @@ static unsigned long vmware_get_tsc_khz(
> > return tsc_hz;
> > }
> >
> > +static unsigned int vmware_calibrate_apic(void)
> > +{
> > + unsigned int calibration_result;
> > + uint32_t eax, ebx, ecx, edx;
> > +
> > + VMWARE_PORT(GETHZ, eax, ebx, ecx, edx);
> > + BUG_ON(!ecx);
> > + calibration_result = ecx / HZ;
> > +
> > + printk(KERN_INFO "APIC bus freq read from hypervisor : %u.%03u MHz\n",
> > + calibration_result / (1000000 / HZ),
> > + calibration_result % (1000000 / HZ));
> > + return calibration_result;
> > +}
> > +
> > static void __init vmware_platform_setup(void)
> > {
> > uint32_t eax, ebx, ecx, edx;
> >
> > VMWARE_PORT(GETHZ, eax, ebx, ecx, edx);
> >
> > - if (ebx != UINT_MAX)
> > + if (ebx != UINT_MAX) {
> > x86_platform.calibrate_tsc = vmware_get_tsc_khz;
> > - else
> > + x86_platform.calibrate_apic = vmware_calibrate_apic;
> > + } else
> > printk(KERN_WARNING
> > - "Failed to get TSC freq from the hypervisor\n");
> > + "Failed to setup VMware hypervisor platform\n");
> > }
> >
> > /*
> > Index: linux-x86-tree.git/arch/x86/kernel/x86_init.c
> > ===================================================================
> > --- linux-x86-tree.git.orig/arch/x86/kernel/x86_init.c 2010-08-17 15:29:21.000000000 -0700
> > +++ linux-x86-tree.git/arch/x86/kernel/x86_init.c 2010-08-17 16:44:20.000000000 -0700
> > @@ -95,7 +95,8 @@ struct x86_platform_ops x86_platform = {
> > .iommu_shutdown = iommu_shutdown_noop,
> > .is_untracked_pat_range = is_ISA_range,
> > .nmi_init = default_nmi_init,
> > - .i8042_detect = default_i8042_detect
> > + .i8042_detect = default_i8042_detect,
> > + .calibrate_apic = native_calibrate_apic
> > };
> >
> > EXPORT_SYMBOL_GPL(x86_platform);
> >
On Wed, 18 Aug 2010, Alok Kataria wrote:
>
> +static void __init initialize_lapic_clkevt(long delta)
> +{
> + /* Calculate the scaled math multiplication factor */
> + lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
> + lapic_clockevent.shift);
> + lapic_clockevent.max_delta_ns =
> + clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
> + lapic_clockevent.min_delta_ns =
> + clockevent_delta2ns(0xF, &lapic_clockevent);
> +}
> +
> static int __init calibrate_APIC_clock(void)
> {
> + apic_calibration_res = x86_init.timers.calibrate_apic();
> + if (apic_calibration_res) {
> + struct clock_event_device *levt = &__get_cpu_var(lapic_events);
> + long delta;
> +
> + if (lapic_clockevent.mult)
> + return 0;
Why is this necessary ? calibrate_APIC_clock() is only called once.
Thanks,
tglx
Hi Thomas,
Thanks for taking a look.
On Tue, 2010-08-24 at 06:37 -0700, Thomas Gleixner wrote:
> On Wed, 18 Aug 2010, Alok Kataria wrote:
> >
> > +static void __init initialize_lapic_clkevt(long delta)
> > +{
> > + /* Calculate the scaled math multiplication factor */
> > + lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
> > + lapic_clockevent.shift);
> > + lapic_clockevent.max_delta_ns =
> > + clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
> > + lapic_clockevent.min_delta_ns =
> > + clockevent_delta2ns(0xF, &lapic_clockevent);
> > +}
> > +
> > static int __init calibrate_APIC_clock(void)
> > {
> > + apic_calibration_res = x86_init.timers.calibrate_apic();
> > + if (apic_calibration_res) {
> > + struct clock_event_device *levt = &__get_cpu_var(lapic_events);
> > + long delta;
> > +
> > + if (lapic_clockevent.mult)
> > + return 0;
>
> Why is this necessary ? calibrate_APIC_clock() is only called once.
>
Yes, though timer.calibrate_apci() could behave differently on different
platforms. For eg. the vmware_calibrate_apic doesn't initialize any of
the lapic_clockevent state and we need this to set it up in that case.
Thanks,
Alok
Alok,
On Tue, 24 Aug 2010, Alok Kataria wrote:
> Hi Thomas,
>
> Thanks for taking a look.
>
> On Tue, 2010-08-24 at 06:37 -0700, Thomas Gleixner wrote:
> > On Wed, 18 Aug 2010, Alok Kataria wrote:
> > >
> > > +static void __init initialize_lapic_clkevt(long delta)
> > > +{
> > > + /* Calculate the scaled math multiplication factor */
> > > + lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
> > > + lapic_clockevent.shift);
> > > + lapic_clockevent.max_delta_ns =
> > > + clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
> > > + lapic_clockevent.min_delta_ns =
> > > + clockevent_delta2ns(0xF, &lapic_clockevent);
> > > +}
> > > +
> > > static int __init calibrate_APIC_clock(void)
> > > {
> > > + apic_calibration_res = x86_init.timers.calibrate_apic();
> > > + if (apic_calibration_res) {
> > > + struct clock_event_device *levt = &__get_cpu_var(lapic_events);
> > > + long delta;
> > > +
> > > + if (lapic_clockevent.mult)
> > > + return 0;
> >
> > Why is this necessary ? calibrate_APIC_clock() is only called once.
> >
>
> Yes, though timer.calibrate_apci() could behave differently on different
> platforms. For eg. the vmware_calibrate_apic doesn't initialize any of
> the lapic_clockevent state and we need this to set it up in that case.
Can we please make this consistent ?
Thanks,
tglx
On Tue, 2010-08-24 at 14:51 -0700, Thomas Gleixner wrote:
> Alok,
>
> On Tue, 24 Aug 2010, Alok Kataria wrote:
>
> > Hi Thomas,
> >
> > Thanks for taking a look.
> >
> > On Tue, 2010-08-24 at 06:37 -0700, Thomas Gleixner wrote:
> > > On Wed, 18 Aug 2010, Alok Kataria wrote:
> > > >
> > > > +static void __init initialize_lapic_clkevt(long delta)
> > > > +{
> > > > + /* Calculate the scaled math multiplication factor */
> > > > + lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
> > > > + lapic_clockevent.shift);
> > > > + lapic_clockevent.max_delta_ns =
> > > > + clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
> > > > + lapic_clockevent.min_delta_ns =
> > > > + clockevent_delta2ns(0xF, &lapic_clockevent);
> > > > +}
> > > > +
> > > > static int __init calibrate_APIC_clock(void)
> > > > {
> > > > + apic_calibration_res = x86_init.timers.calibrate_apic();
> > > > + if (apic_calibration_res) {
> > > > + struct clock_event_device *levt = &__get_cpu_var(lapic_events);
> > > > + long delta;
> > > > +
> > > > + if (lapic_clockevent.mult)
> > > > + return 0;
> > >
> > > Why is this necessary ? calibrate_APIC_clock() is only called once.
> > >
> >
> > Yes, though timer.calibrate_apci() could behave differently on different
> > platforms. For eg. the vmware_calibrate_apic doesn't initialize any of
> > the lapic_clockevent state and we need this to set it up in that case.
>
> Can we please make this consistent ?
Let me rework this patch and get back in a day or two.
Thanks,
Alok
>
> Thanks,
>
> tglx
Hi Thomas,
On Tue, 2010-08-24 at 14:58 -0700, Alok Kataria wrote:
> On Tue, 2010-08-24 at 14:51 -0700, Thomas Gleixner wrote:
> > On Tue, 24 Aug 2010, Alok Kataria wrote:
> > > > > +
> > > > > + if (lapic_clockevent.mult)
> > > > > + return 0;
> > > >
> > > > Why is this necessary ? calibrate_APIC_clock() is only called once.
> > > >
> > >
> > > Yes, though timer.calibrate_apci() could behave differently on different
> > > platforms. For eg. the vmware_calibrate_apic doesn't initialize any of
> > > the lapic_clockevent state and we need this to set it up in that case.
> >
> > Can we please make this consistent ?
How does this patch look ?
Thanks,
Alok
--
Add apic calibration hook.
From: Alok N Kataria <[email protected]>
Add a new function ptr calibrate_apic to x86_init_ops structure. On native this
does the usual apic calibration. On VMware's platform we override it with a
routine which gets that information from the hypervisor.
Signed-off-by: Alok N Kataria <[email protected]>
Cc: H. Peter Anvin <[email protected]>
---
arch/x86/include/asm/apic.h | 6 +++
arch/x86/include/asm/x86_init.h | 2 +
arch/x86/kernel/apic/apic.c | 88 ++++++++++++++++++++-------------------
arch/x86/kernel/cpu/vmware.c | 30 ++++++++++++-
arch/x86/kernel/x86_init.c | 1
5 files changed, 82 insertions(+), 45 deletions(-)
diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 1fa03e0..5012ee5 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -17,6 +17,10 @@
#define ARCH_APICTIMER_STOPS_ON_C3 1
+/* Clock divisor */
+#define APIC_DIVISOR 16
+#define LAPIC_CAL_LOOPS (HZ/10)
+
/*
* Debugging macros
*/
@@ -238,6 +242,8 @@ extern void setup_boot_APIC_clock(void);
extern void setup_secondary_APIC_clock(void);
extern int APIC_init_uniprocessor(void);
extern void enable_NMI_through_LVT0(void);
+extern int native_calibrate_apic(void);
+extern int initialize_lapic(long delta, unsigned int calibration_result);
/*
* On 32bit this is mach-xxx local
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index baa579c..58f982b 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -83,11 +83,13 @@ struct x86_init_paging {
* boot cpu
* @tsc_pre_init: platform function called before TSC init
* @timer_init: initialize the platform timer (default PIT/HPET)
+ * @calibrate_apic: calibrate APIC bus freq (ticks per HZ)
*/
struct x86_init_timers {
void (*setup_percpu_clockev)(void);
void (*tsc_pre_init)(void);
void (*timer_init)(void);
+ int (*calibrate_apic)(void);
};
/**
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index e3b534c..ca5d084 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -176,7 +176,7 @@ static struct resource lapic_resource = {
.flags = IORESOURCE_MEM | IORESOURCE_BUSY,
};
-static unsigned int calibration_result;
+static unsigned int apic_calibration_res;
static int lapic_next_event(unsigned long delta,
struct clock_event_device *evt);
@@ -326,13 +326,6 @@ int lapic_get_maxlvt(void)
}
/*
- * Local APIC timer
- */
-
-/* Clock divisor */
-#define APIC_DIVISOR 16
-
-/*
* This function sets up the local APIC timer, with a timeout of
* 'clocks' APIC bus clock. During calibration we actually call
* this function twice on the boot CPU, once with a bogus timeout
@@ -431,7 +424,7 @@ static void lapic_timer_setup(enum clock_event_mode mode,
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
case CLOCK_EVT_MODE_ONESHOT:
- __setup_APIC_LVTT(calibration_result,
+ __setup_APIC_LVTT(apic_calibration_res,
mode != CLOCK_EVT_MODE_PERIODIC, 1);
break;
case CLOCK_EVT_MODE_UNUSED:
@@ -500,8 +493,6 @@ static void __cpuinit setup_APIC_timer(void)
* back to normal later in the boot process).
*/
-#define LAPIC_CAL_LOOPS (HZ/10)
-
static __initdata int lapic_cal_loops = -1;
static __initdata long lapic_cal_t1, lapic_cal_t2;
static __initdata unsigned long long lapic_cal_tsc1, lapic_cal_tsc2;
@@ -590,13 +581,50 @@ calibrate_by_pmtimer(long deltapm, long *delta, long *deltatsc)
return 0;
}
-static int __init calibrate_APIC_clock(void)
+int __init initialize_lapic(long delta, unsigned int calibration_result)
+{
+ struct clock_event_device *levt = &__get_cpu_var(lapic_events);
+
+ /* Calculate the scaled math multiplication factor */
+ lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
+ lapic_clockevent.shift);
+ lapic_clockevent.max_delta_ns =
+ clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
+ lapic_clockevent.min_delta_ns =
+ clockevent_delta2ns(0xF, &lapic_clockevent);
+
+ apic_calibration_res = calibration_result;
+
+ apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta);
+ apic_printk(APIC_VERBOSE, "..... mult: %u\n", lapic_clockevent.mult);
+ apic_printk(APIC_VERBOSE, "..... calibration result: %u\n",
+ calibration_result);
+
+ apic_printk(APIC_VERBOSE, "..... host bus clock speed is "
+ "%u.%04u MHz.\n",
+ calibration_result / (1000000 / HZ),
+ calibration_result % (1000000 / HZ));
+
+ /*
+ * Do a sanity check on the APIC calibration result
+ */
+ if (calibration_result < (1000000 / HZ)) {
+ pr_warning("APIC frequency too slow, disabling apic timer\n");
+ return -1;
+ }
+
+ levt->features &= ~CLOCK_EVT_FEAT_DUMMY;
+ return 0;
+}
+
+int __init native_calibrate_apic(void)
{
struct clock_event_device *levt = &__get_cpu_var(lapic_events);
void (*real_handler)(struct clock_event_device *dev);
unsigned long deltaj;
long delta, deltatsc;
int pm_referenced = 0;
+ unsigned int calibration_result;
local_irq_disable();
@@ -631,20 +659,12 @@ static int __init calibrate_APIC_clock(void)
pm_referenced = !calibrate_by_pmtimer(lapic_cal_pm2 - lapic_cal_pm1,
&delta, &deltatsc);
- /* Calculate the scaled math multiplication factor */
- lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS,
- lapic_clockevent.shift);
- lapic_clockevent.max_delta_ns =
- clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
- lapic_clockevent.min_delta_ns =
- clockevent_delta2ns(0xF, &lapic_clockevent);
-
calibration_result = (delta * APIC_DIVISOR) / LAPIC_CAL_LOOPS;
- apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta);
- apic_printk(APIC_VERBOSE, "..... mult: %u\n", lapic_clockevent.mult);
- apic_printk(APIC_VERBOSE, "..... calibration result: %u\n",
- calibration_result);
+ if (initialize_lapic(delta, calibration_result)) {
+ local_irq_enable();
+ return -1;
+ }
if (cpu_has_tsc) {
apic_printk(APIC_VERBOSE, "..... CPU clock speed is "
@@ -653,22 +673,6 @@ static int __init calibrate_APIC_clock(void)
(deltatsc / LAPIC_CAL_LOOPS) % (1000000 / HZ));
}
- apic_printk(APIC_VERBOSE, "..... host bus clock speed is "
- "%u.%04u MHz.\n",
- calibration_result / (1000000 / HZ),
- calibration_result % (1000000 / HZ));
-
- /*
- * Do a sanity check on the APIC calibration result
- */
- if (calibration_result < (1000000 / HZ)) {
- local_irq_enable();
- pr_warning("APIC frequency too slow, disabling apic timer\n");
- return -1;
- }
-
- levt->features &= ~CLOCK_EVT_FEAT_DUMMY;
-
/*
* PM timer calibration failed or not turned on
* so lets try APIC timer based calibration
@@ -706,7 +710,7 @@ static int __init calibrate_APIC_clock(void)
if (levt->features & CLOCK_EVT_FEAT_DUMMY) {
pr_warning("APIC timer disabled due to verification failure\n");
- return -1;
+ return -1;
}
return 0;
@@ -738,7 +742,7 @@ void __init setup_boot_APIC_clock(void)
apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n"
"calibrating APIC timer ...\n");
- if (calibrate_APIC_clock()) {
+ if (x86_init.timers.calibrate_apic()) {
/* No broadcast on UP ! */
if (num_possible_cpus() > 1)
setup_APIC_timer();
diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
index 227b044..e8b760e 100644
--- a/arch/x86/kernel/cpu/vmware.c
+++ b/arch/x86/kernel/cpu/vmware.c
@@ -26,6 +26,7 @@
#include <asm/div64.h>
#include <asm/x86_init.h>
#include <asm/hypervisor.h>
+#include <asm/apic.h>
#define CPUID_VMWARE_INFO_LEAF 0x40000000
#define VMWARE_HYPERVISOR_MAGIC 0x564D5868
@@ -72,17 +73,40 @@ static unsigned long vmware_get_tsc_khz(void)
return tsc_hz;
}
+static int __init vmware_calibrate_apic(void)
+{
+ unsigned int calibration_result;
+ uint32_t eax, ebx, ecx, edx;
+ int err;
+ long delta;
+ unsigned long flags;
+
+ VMWARE_PORT(GETHZ, eax, ebx, ecx, edx);
+ BUG_ON(!ecx);
+ calibration_result = ecx / HZ;
+
+ printk(KERN_INFO "APIC bus freq read from hypervisor\n");
+
+ delta = (calibration_result * LAPIC_CAL_LOOPS) / APIC_DIVISOR;
+ local_irq_save(flags);
+ err = initialize_lapic(delta, calibration_result);
+ local_irq_restore(flags);
+
+ return err;
+}
+
static void __init vmware_platform_setup(void)
{
uint32_t eax, ebx, ecx, edx;
VMWARE_PORT(GETHZ, eax, ebx, ecx, edx);
- if (ebx != UINT_MAX)
+ if (ebx != UINT_MAX) {
x86_platform.calibrate_tsc = vmware_get_tsc_khz;
- else
+ x86_init.timers.calibrate_apic = vmware_calibrate_apic;
+ } else
printk(KERN_WARNING
- "Failed to get TSC freq from the hypervisor\n");
+ "Failed to setup VMware hypervisor platform\n");
}
/*
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index cd6da6b..f162e14 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -68,6 +68,7 @@ struct x86_init_ops x86_init __initdata = {
.setup_percpu_clockev = setup_boot_APIC_clock,
.tsc_pre_init = x86_init_noop,
.timer_init = hpet_time_init,
+ .calibrate_apic = native_calibrate_apic
},
.iommu = {