Revision ff5f16820f632079d5095884adc5d71ee3249fa4 authored by Linus Torvalds on 19 February 2016, 16:33:12 UTC, committed by Linus Torvalds on 19 February 2016, 16:33:12 UTC
Pull s390 fixes from Martin Schwidefsky: "Several bug fixes: - There are four different stack tracers, and three of them have bugs. For 4.5 the bugs are fixed and we prepare a cleanup patch for the next merge window. - Three bug fixes for the dasd driver in regard to parallel access volumes and the new max_dev_sectors block device queue limit - The irq restore optimization needs a fixup for memcpy_real - The diagnose trace code has a conflict with lockdep" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/dasd: fix performance drop s390/maccess: reduce stnsm instructions s390/diag: avoid lockdep recursion s390/dasd: fix refcount for PAV reassignment s390/dasd: prevent incorrect length error under z/VM after PAV changes s390: fix DAT off memory access, e.g. on kdump s390/oprofile: fix address range for asynchronous stack s390/perf_event: fix address range for asynchronous stack s390/stacktrace: add save_stack_trace_regs() s390/stacktrace: save full stack traces s390/stacktrace: add missing end marker s390/stacktrace: fix address ranges for asynchronous and panic stack s390/stacktrace: fix save_stack_trace_tsk() for current task
blk-mq-tag.h
#ifndef INT_BLK_MQ_TAG_H
#define INT_BLK_MQ_TAG_H
#include "blk-mq.h"
enum {
BT_WAIT_QUEUES = 8,
BT_WAIT_BATCH = 8,
};
struct bt_wait_state {
atomic_t wait_cnt;
wait_queue_head_t wait;
} ____cacheline_aligned_in_smp;
#define TAG_TO_INDEX(bt, tag) ((tag) >> (bt)->bits_per_word)
#define TAG_TO_BIT(bt, tag) ((tag) & ((1 << (bt)->bits_per_word) - 1))
struct blk_mq_bitmap_tags {
unsigned int depth;
unsigned int wake_cnt;
unsigned int bits_per_word;
unsigned int map_nr;
struct blk_align_bitmap *map;
atomic_t wake_index;
struct bt_wait_state *bs;
};
/*
* Tag address space map.
*/
struct blk_mq_tags {
unsigned int nr_tags;
unsigned int nr_reserved_tags;
atomic_t active_queues;
struct blk_mq_bitmap_tags bitmap_tags;
struct blk_mq_bitmap_tags breserved_tags;
struct request **rqs;
struct list_head page_list;
int alloc_policy;
cpumask_var_t cpumask;
};
extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy);
extern void blk_mq_free_tags(struct blk_mq_tags *tags);
extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, unsigned int tag, unsigned int *last_tag);
extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page);
extern void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *last_tag);
extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth);
extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
void *priv);
enum {
BLK_MQ_TAG_CACHE_MIN = 1,
BLK_MQ_TAG_CACHE_MAX = 64,
};
enum {
BLK_MQ_TAG_FAIL = -1U,
BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN,
BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,
};
extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
{
if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
return false;
return __blk_mq_tag_busy(hctx);
}
static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
{
if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
return;
__blk_mq_tag_idle(hctx);
}
/*
* This helper should only be used for flush request to share tag
* with the request cloned from, and both the two requests can't be
* in flight at the same time. The caller has to make sure the tag
* can't be freed.
*/
static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx,
unsigned int tag, struct request *rq)
{
hctx->tags->rqs[tag] = rq;
}
#endif
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