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freebsd-dev/sys/x86/include/apicvar.h
Mark Johnston 610141cebb Add stack_save_td_running(), a function to trace the kernel stack of a 
running thread.

It is currently implemented only on amd64 and i386; on these
architectures, it is implemented by raising an NMI on the CPU on which
the target thread is currently running. Unlike stack_save_td(), it may
fail, for example if the thread is running in user mode.

This change also modifies the kern.proc.kstack sysctl to use this function,
so that stacks of running threads are shown in the output of "procstat -kk".
This is handy for debugging threads that are stuck in a busy loop.

Reviewed by:	bdrewery, jhb, kib
Sponsored by:	EMC / Isilon Storage Division
Differential Revision:	https://reviews.freebsd.org/D3256
2015-09-11 03:54:37 +00:00

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/*-
* Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _X86_APICVAR_H_
#define _X86_APICVAR_H_
/*
* Local && I/O APIC variable definitions.
*/
/*
* Layout of local APIC interrupt vectors:
*
* 0xff (255) +-------------+
* | | 15 (Spurious / IPIs / Local Interrupts)
* 0xf0 (240) +-------------+
* | | 14 (I/O Interrupts / Timer)
* 0xe0 (224) +-------------+
* | | 13 (I/O Interrupts)
* 0xd0 (208) +-------------+
* | | 12 (I/O Interrupts)
* 0xc0 (192) +-------------+
* | | 11 (I/O Interrupts)
* 0xb0 (176) +-------------+
* | | 10 (I/O Interrupts)
* 0xa0 (160) +-------------+
* | | 9 (I/O Interrupts)
* 0x90 (144) +-------------+
* | | 8 (I/O Interrupts / System Calls)
* 0x80 (128) +-------------+
* | | 7 (I/O Interrupts)
* 0x70 (112) +-------------+
* | | 6 (I/O Interrupts)
* 0x60 (96) +-------------+
* | | 5 (I/O Interrupts)
* 0x50 (80) +-------------+
* | | 4 (I/O Interrupts)
* 0x40 (64) +-------------+
* | | 3 (I/O Interrupts)
* 0x30 (48) +-------------+
* | | 2 (ATPIC Interrupts)
* 0x20 (32) +-------------+
* | | 1 (Exceptions, traps, faults, etc.)
* 0x10 (16) +-------------+
* | | 0 (Exceptions, traps, faults, etc.)
* 0x00 (0) +-------------+
*
* Note: 0x80 needs to be handled specially and not allocated to an
* I/O device!
*/
#define MAX_APIC_ID 0xfe
#define APIC_ID_ALL 0xff
/* I/O Interrupts are used for external devices such as ISA, PCI, etc. */
#define APIC_IO_INTS (IDT_IO_INTS + 16)
#define APIC_NUM_IOINTS 191
/* The timer interrupt is used for clock handling and drives hardclock, etc. */
#define APIC_TIMER_INT (APIC_IO_INTS + APIC_NUM_IOINTS)
/*
********************* !!! WARNING !!! ******************************
* Each local apic has an interrupt receive fifo that is two entries deep
* for each interrupt priority class (higher 4 bits of interrupt vector).
* Once the fifo is full the APIC can no longer receive interrupts for this
* class and sending IPIs from other CPUs will be blocked.
* To avoid deadlocks there should be no more than two IPI interrupts
* pending at the same time.
* Currently this is guaranteed by dividing the IPIs in two groups that have
* each at most one IPI interrupt pending. The first group is protected by the
* smp_ipi_mtx and waits for the completion of the IPI (Only one IPI user
* at a time) The second group uses a single interrupt and a bitmap to avoid
* redundant IPI interrupts.
*/
/* Interrupts for local APIC LVT entries other than the timer. */
#define APIC_LOCAL_INTS 240
#define APIC_ERROR_INT APIC_LOCAL_INTS
#define APIC_THERMAL_INT (APIC_LOCAL_INTS + 1)
#define APIC_CMC_INT (APIC_LOCAL_INTS + 2)
#define APIC_IPI_INTS (APIC_LOCAL_INTS + 3)
#define IPI_RENDEZVOUS (APIC_IPI_INTS) /* Inter-CPU rendezvous. */
#define IPI_INVLTLB (APIC_IPI_INTS + 1) /* TLB Shootdown IPIs */
#define IPI_INVLPG (APIC_IPI_INTS + 2)
#define IPI_INVLRNG (APIC_IPI_INTS + 3)
#define IPI_INVLCACHE (APIC_IPI_INTS + 4)
/* Vector to handle bitmap based IPIs */
#define IPI_BITMAP_VECTOR (APIC_IPI_INTS + 5)
/* IPIs handled by IPI_BITMAP_VECTOR */
#define IPI_AST 0 /* Generate software trap. */
#define IPI_PREEMPT 1
#define IPI_HARDCLOCK 2
#define IPI_BITMAP_LAST IPI_HARDCLOCK
#define IPI_IS_BITMAPED(x) ((x) <= IPI_BITMAP_LAST)
#define IPI_STOP (APIC_IPI_INTS + 6) /* Stop CPU until restarted. */
#define IPI_SUSPEND (APIC_IPI_INTS + 7) /* Suspend CPU until restarted. */
#ifdef __i386__
#define IPI_LAZYPMAP (APIC_IPI_INTS + 8) /* Lazy pmap release. */
#define IPI_DYN_FIRST (APIC_IPI_INTS + 9)
#else
#define IPI_DYN_FIRST (APIC_IPI_INTS + 8)
#endif
#define IPI_DYN_LAST (253) /* IPIs allocated at runtime */
/*
* IPI_STOP_HARD does not need to occupy a slot in the IPI vector space since
* it is delivered using an NMI anyways.
*/
#define IPI_NMI_FIRST 254
#define IPI_TRACE 254 /* Interrupt for tracing. */
#define IPI_STOP_HARD 255 /* Stop CPU with a NMI. */
/*
* The spurious interrupt can share the priority class with the IPIs since
* it is not a normal interrupt. (Does not use the APIC's interrupt fifo)
*/
#define APIC_SPURIOUS_INT 255
#ifndef LOCORE
#define APIC_IPI_DEST_SELF -1
#define APIC_IPI_DEST_ALL -2
#define APIC_IPI_DEST_OTHERS -3
#define APIC_BUS_UNKNOWN -1
#define APIC_BUS_ISA 0
#define APIC_BUS_EISA 1
#define APIC_BUS_PCI 2
#define APIC_BUS_MAX APIC_BUS_PCI
#define IRQ_EXTINT (NUM_IO_INTS + 1)
#define IRQ_NMI (NUM_IO_INTS + 2)
#define IRQ_SMI (NUM_IO_INTS + 3)
#define IRQ_DISABLED (NUM_IO_INTS + 4)
/*
* An APIC enumerator is a psuedo bus driver that enumerates APIC's including
* CPU's and I/O APIC's.
*/
struct apic_enumerator {
const char *apic_name;
int (*apic_probe)(void);
int (*apic_probe_cpus)(void);
int (*apic_setup_local)(void);
int (*apic_setup_io)(void);
SLIST_ENTRY(apic_enumerator) apic_next;
};
inthand_t
IDTVEC(apic_isr1), IDTVEC(apic_isr2), IDTVEC(apic_isr3),
IDTVEC(apic_isr4), IDTVEC(apic_isr5), IDTVEC(apic_isr6),
IDTVEC(apic_isr7), IDTVEC(cmcint), IDTVEC(errorint),
IDTVEC(spuriousint), IDTVEC(timerint);
extern vm_paddr_t lapic_paddr;
extern int apic_cpuids[];
void apic_register_enumerator(struct apic_enumerator *enumerator);
void *ioapic_create(vm_paddr_t addr, int32_t apic_id, int intbase);
int ioapic_disable_pin(void *cookie, u_int pin);
int ioapic_get_vector(void *cookie, u_int pin);
void ioapic_register(void *cookie);
int ioapic_remap_vector(void *cookie, u_int pin, int vector);
int ioapic_set_bus(void *cookie, u_int pin, int bus_type);
int ioapic_set_extint(void *cookie, u_int pin);
int ioapic_set_nmi(void *cookie, u_int pin);
int ioapic_set_polarity(void *cookie, u_int pin, enum intr_polarity pol);
int ioapic_set_triggermode(void *cookie, u_int pin,
enum intr_trigger trigger);
int ioapic_set_smi(void *cookie, u_int pin);
/*
* Struct containing pointers to APIC functions whose
* implementation is run time selectable.
*/
struct apic_ops {
void (*create)(u_int, int);
void (*init)(vm_paddr_t);
void (*xapic_mode)(void);
void (*setup)(int);
void (*dump)(const char *);
void (*disable)(void);
void (*eoi)(void);
int (*id)(void);
int (*intr_pending)(u_int);
void (*set_logical_id)(u_int, u_int, u_int);
u_int (*cpuid)(u_int);
/* Vectors */
u_int (*alloc_vector)(u_int, u_int);
u_int (*alloc_vectors)(u_int, u_int *, u_int, u_int);
void (*enable_vector)(u_int, u_int);
void (*disable_vector)(u_int, u_int);
void (*free_vector)(u_int, u_int, u_int);
/* PMC */
int (*enable_pmc)(void);
void (*disable_pmc)(void);
void (*reenable_pmc)(void);
/* CMC */
void (*enable_cmc)(void);
/* IPI */
void (*ipi_raw)(register_t, u_int);
void (*ipi_vectored)(u_int, int);
int (*ipi_wait)(int);
int (*ipi_alloc)(inthand_t *ipifunc);
void (*ipi_free)(int vector);
/* LVT */
int (*set_lvt_mask)(u_int, u_int, u_char);
int (*set_lvt_mode)(u_int, u_int, u_int32_t);
int (*set_lvt_polarity)(u_int, u_int, enum intr_polarity);
int (*set_lvt_triggermode)(u_int, u_int, enum intr_trigger);
};
extern struct apic_ops apic_ops;
static inline void
lapic_create(u_int apic_id, int boot_cpu)
{
apic_ops.create(apic_id, boot_cpu);
}
static inline void
lapic_init(vm_paddr_t addr)
{
apic_ops.init(addr);
}
static inline void
lapic_xapic_mode(void)
{
apic_ops.xapic_mode();
}
static inline void
lapic_setup(int boot)
{
apic_ops.setup(boot);
}
static inline void
lapic_dump(const char *str)
{
apic_ops.dump(str);
}
static inline void
lapic_disable(void)
{
apic_ops.disable();
}
static inline void
lapic_eoi(void)
{
apic_ops.eoi();
}
static inline int
lapic_id(void)
{
return (apic_ops.id());
}
static inline int
lapic_intr_pending(u_int vector)
{
return (apic_ops.intr_pending(vector));
}
/* XXX: UNUSED */
static inline void
lapic_set_logical_id(u_int apic_id, u_int cluster, u_int cluster_id)
{
apic_ops.set_logical_id(apic_id, cluster, cluster_id);
}
static inline u_int
apic_cpuid(u_int apic_id)
{
return (apic_ops.cpuid(apic_id));
}
static inline u_int
apic_alloc_vector(u_int apic_id, u_int irq)
{
return (apic_ops.alloc_vector(apic_id, irq));
}
static inline u_int
apic_alloc_vectors(u_int apic_id, u_int *irqs, u_int count, u_int align)
{
return (apic_ops.alloc_vectors(apic_id, irqs, count, align));
}
static inline void
apic_enable_vector(u_int apic_id, u_int vector)
{
apic_ops.enable_vector(apic_id, vector);
}
static inline void
apic_disable_vector(u_int apic_id, u_int vector)
{
apic_ops.disable_vector(apic_id, vector);
}
static inline void
apic_free_vector(u_int apic_id, u_int vector, u_int irq)
{
apic_ops.free_vector(apic_id, vector, irq);
}
static inline int
lapic_enable_pmc(void)
{
return (apic_ops.enable_pmc());
}
static inline void
lapic_disable_pmc(void)
{
apic_ops.disable_pmc();
}
static inline void
lapic_reenable_pmc(void)
{
apic_ops.reenable_pmc();
}
static inline void
lapic_enable_cmc(void)
{
apic_ops.enable_cmc();
}
static inline void
lapic_ipi_raw(register_t icrlo, u_int dest)
{
apic_ops.ipi_raw(icrlo, dest);
}
static inline void
lapic_ipi_vectored(u_int vector, int dest)
{
apic_ops.ipi_vectored(vector, dest);
}
static inline int
lapic_ipi_wait(int delay)
{
return (apic_ops.ipi_wait(delay));
}
static inline int
lapic_ipi_alloc(inthand_t *ipifunc)
{
return (apic_ops.ipi_alloc(ipifunc));
}
static inline void
lapic_ipi_free(int vector)
{
return (apic_ops.ipi_free(vector));
}
static inline int
lapic_set_lvt_mask(u_int apic_id, u_int lvt, u_char masked)
{
return (apic_ops.set_lvt_mask(apic_id, lvt, masked));
}
static inline int
lapic_set_lvt_mode(u_int apic_id, u_int lvt, u_int32_t mode)
{
return (apic_ops.set_lvt_mode(apic_id, lvt, mode));
}
static inline int
lapic_set_lvt_polarity(u_int apic_id, u_int lvt, enum intr_polarity pol)
{
return (apic_ops.set_lvt_polarity(apic_id, lvt, pol));
}
static inline int
lapic_set_lvt_triggermode(u_int apic_id, u_int lvt, enum intr_trigger trigger)
{
return (apic_ops.set_lvt_triggermode(apic_id, lvt, trigger));
}
void lapic_handle_cmc(void);
void lapic_handle_error(void);
void lapic_handle_intr(int vector, struct trapframe *frame);
void lapic_handle_timer(struct trapframe *frame);
void xen_intr_handle_upcall(struct trapframe *frame);
void hv_vector_handler(struct trapframe *frame);
extern int x2apic_mode;
extern int lapic_eoi_suppression;
#ifdef _SYS_SYSCTL_H_
SYSCTL_DECL(_hw_apic);
#endif
#endif /* !LOCORE */
#endif /* _X86_APICVAR_H_ */
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