FM / asm

/usr/src/linux-headers-5.15.0-181/arch/csky/include/asm/

/usr/src/linux-headers-5.15.0-181/arch/csky/include/asm

Name	Size	Mode	Actions
vdso/	-	0755	rm
addrspace.h	231	0644	edit dl rm
asid.h	2440	0644	edit dl rm
barrier.h	2533	0644	edit dl rm
bitops.h	1363	0644	edit dl rm
bug.h	565	0644	edit dl rm
cache.h	861	0644	edit dl rm
cacheflush.h	193	0644	edit dl rm
checksum.h	944	0644	edit dl rm
clocksource.h	159	0644	edit dl rm
cmpxchg.h	1824	0644	edit dl rm
elf.h	2723	0644	edit dl rm
fixmap.h	747	0644	edit dl rm
ftrace.h	558	0644	edit dl rm
futex.h	2605	0644	edit dl rm
highmem.h	1114	0644	edit dl rm
io.h	1384	0644	edit dl rm
irqflags.h	1132	0644	edit dl rm
irq_work.h	208	0644	edit dl rm
Kbuild	199	0644	edit dl rm
kprobes.h	1158	0644	edit dl rm
memory.h	657	0644	edit dl rm
mmu.h	216	0644	edit dl rm
mmu_context.h	959	0644	edit dl rm
page.h	2757	0644	edit dl rm
pci.h	680	0644	edit dl rm
perf_event.h	359	0644	edit dl rm
pgalloc.h	1657	0644	edit dl rm
pgtable.h	6985	0644	edit dl rm
probes.h	554	0644	edit dl rm
processor.h	2525	0644	edit dl rm
ptrace.h	2476	0644	edit dl rm
reg_ops.h	382	0644	edit dl rm
seccomp.h	283	0644	edit dl rm
segment.h	187	0644	edit dl rm
shmparam.h	197	0644	edit dl rm
smp.h	626	0644	edit dl rm
spinlock.h	1892	0644	edit dl rm
spinlock_types.h	504	0644	edit dl rm
stackprotector.h	705	0644	edit dl rm
string.h	233	0644	edit dl rm
switch_to.h	923	0644	edit dl rm
syscall.h	1563	0644	edit dl rm
syscalls.h	351	0644	edit dl rm
tcm.h	665	0644	edit dl rm
thread_info.h	2866	0644	edit dl rm
tlb.h	508	0644	edit dl rm
tlbflush.h	824	0644	edit dl rm
traps.h	796	0644	edit dl rm
uaccess.h	5271	0644	edit dl rm
unistd.h	106	0644	edit dl rm
uprobes.h	669	0644	edit dl rm
vdso.h	784	0644	edit dl rm
vmalloc.h	90	0644	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-181/arch/csky/include/asm/asid.h (2440B)

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_ASM_ASID_H
#define __ASM_ASM_ASID_H

#include <linux/atomic.h>
#include <linux/compiler.h>
#include <linux/cpumask.h>
#include <linux/percpu.h>
#include <linux/spinlock.h>

struct asid_info
{
	atomic64_t	generation;
	unsigned long	*map;
	atomic64_t __percpu	*active;
	u64 __percpu		*reserved;
	u32			bits;
	/* Lock protecting the structure */
	raw_spinlock_t		lock;
	/* Which CPU requires context flush on next call */
	cpumask_t		flush_pending;
	/* Number of ASID allocated by context (shift value) */
	unsigned int		ctxt_shift;
	/* Callback to locally flush the context. */
	void			(*flush_cpu_ctxt_cb)(void);
};

#define NUM_ASIDS(info)			(1UL << ((info)->bits))
#define NUM_CTXT_ASIDS(info)		(NUM_ASIDS(info) >> (info)->ctxt_shift)

#define active_asid(info, cpu)	*per_cpu_ptr((info)->active, cpu)

void asid_new_context(struct asid_info *info, atomic64_t *pasid,
		      unsigned int cpu, struct mm_struct *mm);

/*
 * Check the ASID is still valid for the context. If not generate a new ASID.
 *
 * @pasid: Pointer to the current ASID batch
 * @cpu: current CPU ID. Must have been acquired through get_cpu()
 */
static inline void asid_check_context(struct asid_info *info,
				      atomic64_t *pasid, unsigned int cpu,
				      struct mm_struct *mm)
{
	u64 asid, old_active_asid;

asid = atomic64_read(pasid);

/*
	 * The memory ordering here is subtle.
	 * If our active_asid is non-zero and the ASID matches the current
	 * generation, then we update the active_asid entry with a relaxed
	 * cmpxchg. Racing with a concurrent rollover means that either:
	 *
	 * - We get a zero back from the cmpxchg and end up waiting on the
	 *   lock. Taking the lock synchronises with the rollover and so
	 *   we are forced to see the updated generation.
	 *
	 * - We get a valid ASID back from the cmpxchg, which means the
	 *   relaxed xchg in flush_context will treat us as reserved
	 *   because atomic RmWs are totally ordered for a given location.
	 */
	old_active_asid = atomic64_read(&active_asid(info, cpu));
	if (old_active_asid &&
	    !((asid ^ atomic64_read(&info->generation)) >> info->bits) &&
	    atomic64_cmpxchg_relaxed(&active_asid(info, cpu),
				     old_active_asid, asid))
		return;

asid_new_context(info, pasid, cpu, mm);
}

int asid_allocator_init(struct asid_info *info,
			u32 bits, unsigned int asid_per_ctxt,
			void (*flush_cpu_ctxt_cb)(void));

#endif

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