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/* 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 throught 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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