mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 16:40:52 +07:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
119 lines
3.4 KiB
C
119 lines
3.4 KiB
C
#ifndef _ASM_GENERIC_LOCAL_H
|
|
#define _ASM_GENERIC_LOCAL_H
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/hardirq.h>
|
|
#include <asm/types.h>
|
|
|
|
/* An unsigned long type for operations which are atomic for a single
|
|
* CPU. Usually used in combination with per-cpu variables. */
|
|
|
|
#if BITS_PER_LONG == 32
|
|
/* Implement in terms of atomics. */
|
|
|
|
/* Don't use typedef: don't want them to be mixed with atomic_t's. */
|
|
typedef struct
|
|
{
|
|
atomic_t a;
|
|
} local_t;
|
|
|
|
#define LOCAL_INIT(i) { ATOMIC_INIT(i) }
|
|
|
|
#define local_read(l) ((unsigned long)atomic_read(&(l)->a))
|
|
#define local_set(l,i) atomic_set((&(l)->a),(i))
|
|
#define local_inc(l) atomic_inc(&(l)->a)
|
|
#define local_dec(l) atomic_dec(&(l)->a)
|
|
#define local_add(i,l) atomic_add((i),(&(l)->a))
|
|
#define local_sub(i,l) atomic_sub((i),(&(l)->a))
|
|
|
|
/* Non-atomic variants, ie. preemption disabled and won't be touched
|
|
* in interrupt, etc. Some archs can optimize this case well. */
|
|
#define __local_inc(l) local_set((l), local_read(l) + 1)
|
|
#define __local_dec(l) local_set((l), local_read(l) - 1)
|
|
#define __local_add(i,l) local_set((l), local_read(l) + (i))
|
|
#define __local_sub(i,l) local_set((l), local_read(l) - (i))
|
|
|
|
#else /* ... can't use atomics. */
|
|
/* Implement in terms of three variables.
|
|
Another option would be to use local_irq_save/restore. */
|
|
|
|
typedef struct
|
|
{
|
|
/* 0 = in hardirq, 1 = in softirq, 2 = usermode. */
|
|
unsigned long v[3];
|
|
} local_t;
|
|
|
|
#define _LOCAL_VAR(l) ((l)->v[!in_interrupt() + !in_irq()])
|
|
|
|
#define LOCAL_INIT(i) { { (i), 0, 0 } }
|
|
|
|
static inline unsigned long local_read(local_t *l)
|
|
{
|
|
return l->v[0] + l->v[1] + l->v[2];
|
|
}
|
|
|
|
static inline void local_set(local_t *l, unsigned long v)
|
|
{
|
|
l->v[0] = v;
|
|
l->v[1] = l->v[2] = 0;
|
|
}
|
|
|
|
static inline void local_inc(local_t *l)
|
|
{
|
|
preempt_disable();
|
|
_LOCAL_VAR(l)++;
|
|
preempt_enable();
|
|
}
|
|
|
|
static inline void local_dec(local_t *l)
|
|
{
|
|
preempt_disable();
|
|
_LOCAL_VAR(l)--;
|
|
preempt_enable();
|
|
}
|
|
|
|
static inline void local_add(unsigned long v, local_t *l)
|
|
{
|
|
preempt_disable();
|
|
_LOCAL_VAR(l) += v;
|
|
preempt_enable();
|
|
}
|
|
|
|
static inline void local_sub(unsigned long v, local_t *l)
|
|
{
|
|
preempt_disable();
|
|
_LOCAL_VAR(l) -= v;
|
|
preempt_enable();
|
|
}
|
|
|
|
/* Non-atomic variants, ie. preemption disabled and won't be touched
|
|
* in interrupt, etc. Some archs can optimize this case well. */
|
|
#define __local_inc(l) ((l)->v[0]++)
|
|
#define __local_dec(l) ((l)->v[0]--)
|
|
#define __local_add(i,l) ((l)->v[0] += (i))
|
|
#define __local_sub(i,l) ((l)->v[0] -= (i))
|
|
|
|
#endif /* Non-atomic implementation */
|
|
|
|
/* Use these for per-cpu local_t variables: on some archs they are
|
|
* much more efficient than these naive implementations. Note they take
|
|
* a variable (eg. mystruct.foo), not an address.
|
|
*/
|
|
#define cpu_local_read(v) local_read(&__get_cpu_var(v))
|
|
#define cpu_local_set(v, i) local_set(&__get_cpu_var(v), (i))
|
|
#define cpu_local_inc(v) local_inc(&__get_cpu_var(v))
|
|
#define cpu_local_dec(v) local_dec(&__get_cpu_var(v))
|
|
#define cpu_local_add(i, v) local_add((i), &__get_cpu_var(v))
|
|
#define cpu_local_sub(i, v) local_sub((i), &__get_cpu_var(v))
|
|
|
|
/* Non-atomic increments, ie. preemption disabled and won't be touched
|
|
* in interrupt, etc. Some archs can optimize this case well.
|
|
*/
|
|
#define __cpu_local_inc(v) __local_inc(&__get_cpu_var(v))
|
|
#define __cpu_local_dec(v) __local_dec(&__get_cpu_var(v))
|
|
#define __cpu_local_add(i, v) __local_add((i), &__get_cpu_var(v))
|
|
#define __cpu_local_sub(i, v) __local_sub((i), &__get_cpu_var(v))
|
|
|
|
#endif /* _ASM_GENERIC_LOCAL_H */
|