~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/block/blk-mq.h

Version: ~ [ linux-5.10-rc5 ] ~ [ linux-5.9.10 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.79 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.159 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.208 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.245 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.245 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 #ifndef INT_BLK_MQ_H
  2 #define INT_BLK_MQ_H
  3 
  4 struct blk_mq_tag_set;
  5 
  6 struct blk_mq_ctx {
  7         struct {
  8                 spinlock_t              lock;
  9                 struct list_head        rq_list;
 10         }  ____cacheline_aligned_in_smp;
 11 
 12         unsigned int            cpu;
 13         unsigned int            index_hw;
 14 
 15         unsigned int            last_tag ____cacheline_aligned_in_smp;
 16 
 17         /* incremented at dispatch time */
 18         unsigned long           rq_dispatched[2];
 19         unsigned long           rq_merged;
 20 
 21         /* incremented at completion time */
 22         unsigned long           ____cacheline_aligned_in_smp rq_completed[2];
 23 
 24         struct request_queue    *queue;
 25         struct kobject          kobj;
 26 } ____cacheline_aligned_in_smp;
 27 
 28 void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
 29 void blk_mq_freeze_queue(struct request_queue *q);
 30 void blk_mq_free_queue(struct request_queue *q);
 31 int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
 32 void blk_mq_wake_waiters(struct request_queue *q);
 33 
 34 /*
 35  * CPU hotplug helpers
 36  */
 37 struct blk_mq_cpu_notifier;
 38 void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
 39                               int (*fn)(void *, unsigned long, unsigned int),
 40                               void *data);
 41 void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
 42 void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
 43 void blk_mq_cpu_init(void);
 44 void blk_mq_enable_hotplug(void);
 45 void blk_mq_disable_hotplug(void);
 46 
 47 /*
 48  * CPU -> queue mappings
 49  */
 50 extern unsigned int *blk_mq_make_queue_map(struct blk_mq_tag_set *set);
 51 extern int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues,
 52                                    const struct cpumask *online_mask);
 53 extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);
 54 
 55 /*
 56  * sysfs helpers
 57  */
 58 extern int blk_mq_sysfs_register(struct request_queue *q);
 59 extern void blk_mq_sysfs_unregister(struct request_queue *q);
 60 
 61 extern void blk_mq_rq_timed_out(struct request *req, bool reserved);
 62 
 63 void blk_mq_release(struct request_queue *q);
 64 
 65 /*
 66  * Basic implementation of sparser bitmap, allowing the user to spread
 67  * the bits over more cachelines.
 68  */
 69 struct blk_align_bitmap {
 70         unsigned long word;
 71         unsigned long depth;
 72 } ____cacheline_aligned_in_smp;
 73 
 74 static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
 75                                            unsigned int cpu)
 76 {
 77         return per_cpu_ptr(q->queue_ctx, cpu);
 78 }
 79 
 80 /*
 81  * This assumes per-cpu software queueing queues. They could be per-node
 82  * as well, for instance. For now this is hardcoded as-is. Note that we don't
 83  * care about preemption, since we know the ctx's are persistent. This does
 84  * mean that we can't rely on ctx always matching the currently running CPU.
 85  */
 86 static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
 87 {
 88         return __blk_mq_get_ctx(q, get_cpu());
 89 }
 90 
 91 static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
 92 {
 93         put_cpu();
 94 }
 95 
 96 struct blk_mq_alloc_data {
 97         /* input parameter */
 98         struct request_queue *q;
 99         unsigned int flags;
100 
101         /* input & output parameter */
102         struct blk_mq_ctx *ctx;
103         struct blk_mq_hw_ctx *hctx;
104 };
105 
106 static inline void blk_mq_set_alloc_data(struct blk_mq_alloc_data *data,
107                 struct request_queue *q, unsigned int flags,
108                 struct blk_mq_ctx *ctx, struct blk_mq_hw_ctx *hctx)
109 {
110         data->q = q;
111         data->flags = flags;
112         data->ctx = ctx;
113         data->hctx = hctx;
114 }
115 
116 static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
117 {
118         return hctx->nr_ctx && hctx->tags;
119 }
120 
121 #endif
122 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp