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kernel-ark/arch/blackfin/include/asm/irqflags.h
Steven Rostedt a2de3f79b1 Blackfin: irqs: do not trace arch_local_{*,irq_*} functions 
Do not trace arch_local_save_flags(), arch_local_irq_*() and friends.
Although they are marked inline, gcc may still make a function out of
them and add it to the pool of functions that are traced by the function
tracer. This can cause undesirable results (kernel panic, triple faults,
etc).

Add the notrace notation to prevent them from ever being traced.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2011-07-23 01:18:33 -04:00

286 lines
7.1 KiB
C
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/*
* interface to Blackfin CEC
*
* Copyright 2009 Analog Devices Inc.
* Licensed under the GPL-2 or later.
*/
#ifndef __ASM_BFIN_IRQFLAGS_H__
#define __ASM_BFIN_IRQFLAGS_H__
#include <mach/blackfin.h>
#ifdef CONFIG_SMP
# include <asm/pda.h>
# include <asm/processor.h>
# define bfin_irq_flags cpu_pda[blackfin_core_id()].imask
#else
extern unsigned long bfin_irq_flags;
#endif
static inline notrace void bfin_sti(unsigned long flags)
{
asm volatile("sti %0;" : : "d" (flags));
}
static inline notrace unsigned long bfin_cli(void)
{
unsigned long flags;
asm volatile("cli %0;" : "=d" (flags));
return flags;
}
#ifdef CONFIG_DEBUG_HWERR
# define bfin_no_irqs 0x3f
#else
# define bfin_no_irqs 0x1f
#endif
/*****************************************************************************/
/*
* Hard, untraced CPU interrupt flag manipulation and access.
*/
static inline notrace void __hard_local_irq_disable(void)
{
bfin_cli();
}
static inline notrace void __hard_local_irq_enable(void)
{
bfin_sti(bfin_irq_flags);
}
static inline notrace unsigned long hard_local_save_flags(void)
{
return bfin_read_IMASK();
}
static inline notrace unsigned long __hard_local_irq_save(void)
{
unsigned long flags;
flags = bfin_cli();
#ifdef CONFIG_DEBUG_HWERR
bfin_sti(0x3f);
#endif
return flags;
}
static inline notrace int hard_irqs_disabled_flags(unsigned long flags)
{
return (flags & ~0x3f) == 0;
}
static inline notrace int hard_irqs_disabled(void)
{
unsigned long flags = hard_local_save_flags();
return hard_irqs_disabled_flags(flags);
}
static inline notrace void __hard_local_irq_restore(unsigned long flags)
{
if (!hard_irqs_disabled_flags(flags))
__hard_local_irq_enable();
}
/*****************************************************************************/
/*
* Interrupt pipe handling.
*/
#ifdef CONFIG_IPIPE
#include <linux/compiler.h>
#include <linux/ipipe_trace.h>
/*
* Way too many inter-deps between low-level headers in this port, so
* we redeclare the required bits we cannot pick from
* <asm/ipipe_base.h> to prevent circular dependencies.
*/
void __ipipe_stall_root(void);
void __ipipe_unstall_root(void);
unsigned long __ipipe_test_root(void);
unsigned long __ipipe_test_and_stall_root(void);
void __ipipe_restore_root(unsigned long flags);
#ifdef CONFIG_IPIPE_DEBUG_CONTEXT
struct ipipe_domain;
extern struct ipipe_domain ipipe_root;
void ipipe_check_context(struct ipipe_domain *ipd);
#define __check_irqop_context(ipd) ipipe_check_context(&ipipe_root)
#else /* !CONFIG_IPIPE_DEBUG_CONTEXT */
#define __check_irqop_context(ipd) do { } while (0)
#endif /* !CONFIG_IPIPE_DEBUG_CONTEXT */
/*
* Interrupt pipe interface to linux/irqflags.h.
*/
static inline notrace void arch_local_irq_disable(void)
{
__check_irqop_context();
__ipipe_stall_root();
barrier();
}
static inline notrace void arch_local_irq_enable(void)
{
barrier();
__check_irqop_context();
__ipipe_unstall_root();
}
static inline notrace unsigned long arch_local_save_flags(void)
{
return __ipipe_test_root() ? bfin_no_irqs : bfin_irq_flags;
}
static inline notrace int arch_irqs_disabled_flags(unsigned long flags)
{
return flags == bfin_no_irqs;
}
static inline notrace unsigned long arch_local_irq_save(void)
{
unsigned long flags;
__check_irqop_context();
flags = __ipipe_test_and_stall_root() ? bfin_no_irqs : bfin_irq_flags;
barrier();
return flags;
}
static inline notrace void arch_local_irq_restore(unsigned long flags)
{
__check_irqop_context();
__ipipe_restore_root(flags == bfin_no_irqs);
}
static inline notrace unsigned long arch_mangle_irq_bits(int virt, unsigned long real)
{
/*
* Merge virtual and real interrupt mask bits into a single
* 32bit word.
*/
return (real & ~(1 << 31)) | ((virt != 0) << 31);
}
static inline notrace int arch_demangle_irq_bits(unsigned long *x)
{
int virt = (*x & (1 << 31)) != 0;
*x &= ~(1L << 31);
return virt;
}
/*
* Interface to various arch routines that may be traced.
*/
#ifdef CONFIG_IPIPE_TRACE_IRQSOFF
static inline notrace void hard_local_irq_disable(void)
{
if (!hard_irqs_disabled()) {
__hard_local_irq_disable();
ipipe_trace_begin(0x80000000);
}
}
static inline notrace void hard_local_irq_enable(void)
{
if (hard_irqs_disabled()) {
ipipe_trace_end(0x80000000);
__hard_local_irq_enable();
}
}
static inline notrace unsigned long hard_local_irq_save(void)
{
unsigned long flags = hard_local_save_flags();
if (!hard_irqs_disabled_flags(flags)) {
__hard_local_irq_disable();
ipipe_trace_begin(0x80000001);
}
return flags;
}
static inline notrace void hard_local_irq_restore(unsigned long flags)
{
if (!hard_irqs_disabled_flags(flags)) {
ipipe_trace_end(0x80000001);
__hard_local_irq_enable();
}
}
#else /* !CONFIG_IPIPE_TRACE_IRQSOFF */
# define hard_local_irq_disable() __hard_local_irq_disable()
# define hard_local_irq_enable() __hard_local_irq_enable()
# define hard_local_irq_save() __hard_local_irq_save()
# define hard_local_irq_restore(flags) __hard_local_irq_restore(flags)
#endif /* !CONFIG_IPIPE_TRACE_IRQSOFF */
#define hard_local_irq_save_cond() hard_local_irq_save()
#define hard_local_irq_restore_cond(flags) hard_local_irq_restore(flags)
#else /* !CONFIG_IPIPE */
/*
* Direct interface to linux/irqflags.h.
*/
#define arch_local_save_flags() hard_local_save_flags()
#define arch_local_irq_save(flags) __hard_local_irq_save()
#define arch_local_irq_restore(flags) __hard_local_irq_restore(flags)
#define arch_local_irq_enable() __hard_local_irq_enable()
#define arch_local_irq_disable() __hard_local_irq_disable()
#define arch_irqs_disabled_flags(flags) hard_irqs_disabled_flags(flags)
#define arch_irqs_disabled() hard_irqs_disabled()
/*
* Interface to various arch routines that may be traced.
*/
#define hard_local_irq_save() __hard_local_irq_save()
#define hard_local_irq_restore(flags) __hard_local_irq_restore(flags)
#define hard_local_irq_enable() __hard_local_irq_enable()
#define hard_local_irq_disable() __hard_local_irq_disable()
#define hard_local_irq_save_cond() hard_local_save_flags()
#define hard_local_irq_restore_cond(flags) do { (void)(flags); } while (0)
#endif /* !CONFIG_IPIPE */
#ifdef CONFIG_SMP
#define hard_local_irq_save_smp() hard_local_irq_save()
#define hard_local_irq_restore_smp(flags) hard_local_irq_restore(flags)
#else
#define hard_local_irq_save_smp() hard_local_save_flags()
#define hard_local_irq_restore_smp(flags) do { (void)(flags); } while (0)
#endif
/*
* Remap the arch-neutral IRQ state manipulation macros to the
* blackfin-specific hard_local_irq_* API.
*/
#define local_irq_save_hw(flags) \
do { \
(flags) = hard_local_irq_save(); \
} while (0)
#define local_irq_restore_hw(flags) \
do { \
hard_local_irq_restore(flags); \
} while (0)
#define local_irq_disable_hw() \
do { \
hard_local_irq_disable(); \
} while (0)
#define local_irq_enable_hw() \
do { \
hard_local_irq_enable(); \
} while (0)
#define local_irq_save_hw_notrace(flags) \
do { \
(flags) = __hard_local_irq_save(); \
} while (0)
#define local_irq_restore_hw_notrace(flags) \
do { \
__hard_local_irq_restore(flags); \
} while (0)
#define irqs_disabled_hw() hard_irqs_disabled()
#endif
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