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/* SPDX-License-Identifier: GPL-2.0 */
/*
* dibs loopback (aka loopback-ism) device structure definitions.
*
* Copyright (c) 2024, Alibaba Inc.
*
* Author: Wen Gu <guwen@linux.alibaba.com>
* Tony Lu <tonylu@linux.alibaba.com>
*
*/
#ifndef _DIBS_LOOPBACK_H
#define _DIBS_LOOPBACK_H
#include <linux/dibs.h>
#include <linux/hashtable.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/wait.h>
#if IS_ENABLED(CONFIG_DIBS_LO)
#define DIBS_LO_DMBS_HASH_BITS 12
#define DIBS_LO_MAX_DMBS 5000
struct dibs_lo_dmb_node {
struct hlist_node list;
u64 token;
u32 len;
u32 sba_idx;
void *cpu_addr;
dma_addr_t dma_addr;
refcount_t refcnt;
};
struct dibs_lo_dev {
struct dibs_dev *dibs;
atomic_t dmb_cnt;
rwlock_t dmb_ht_lock;
DECLARE_BITMAP(sba_idx_mask, DIBS_LO_MAX_DMBS);
DECLARE_HASHTABLE(dmb_ht, DIBS_LO_DMBS_HASH_BITS);
wait_queue_head_t ldev_release;
};
int dibs_loopback_init(void);
void dibs_loopback_exit(void);
#else
static inline int dibs_loopback_init(void)
{
return 0;
}
static inline void dibs_loopback_exit(void)
{
}
#endif
#endif /* _DIBS_LOOPBACK_H */
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