1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * dibs loopback (aka loopback-ism) device structure definitions. 4 * 5 * Copyright (c) 2024, Alibaba Inc. 6 * 7 * Author: Wen Gu <guwen@linux.alibaba.com> 8 * Tony Lu <tonylu@linux.alibaba.com> 9 * 10 */ 11 12 #ifndef _DIBS_LOOPBACK_H 13 #define _DIBS_LOOPBACK_H 14 15 #include <linux/dibs.h> 16 #include <linux/hashtable.h> 17 #include <linux/spinlock.h> 18 #include <linux/types.h> 19 #include <linux/wait.h> 20 21 #if IS_ENABLED(CONFIG_DIBS_LO) 22 #define DIBS_LO_DMBS_HASH_BITS 12 23 #define DIBS_LO_MAX_DMBS 5000 24 25 struct dibs_lo_dmb_node { 26 struct hlist_node list; 27 u64 token; 28 u32 len; 29 u32 sba_idx; 30 void *cpu_addr; 31 dma_addr_t dma_addr; 32 refcount_t refcnt; 33 }; 34 35 struct dibs_lo_dev { 36 struct dibs_dev *dibs; 37 atomic_t dmb_cnt; 38 rwlock_t dmb_ht_lock; 39 DECLARE_BITMAP(sba_idx_mask, DIBS_LO_MAX_DMBS); 40 DECLARE_HASHTABLE(dmb_ht, DIBS_LO_DMBS_HASH_BITS); 41 wait_queue_head_t ldev_release; 42 }; 43 44 int dibs_loopback_init(void); 45 void dibs_loopback_exit(void); 46 #else 47 static inline int dibs_loopback_init(void) 48 { 49 return 0; 50 } 51 52 static inline void dibs_loopback_exit(void) 53 { 54 } 55 #endif 56 57 #endif /* _DIBS_LOOPBACK_H */ 58