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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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8622384f13
Introduce a module parameter to specify the number of requests we try to handle with one HW request. Suggested-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
136 lines
3.7 KiB
C
136 lines
3.7 KiB
C
#ifndef SCM_BLK_H
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#define SCM_BLK_H
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/blkdev.h>
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#include <linux/genhd.h>
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#include <linux/list.h>
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#include <asm/debug.h>
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#include <asm/eadm.h>
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#define SCM_NR_PARTS 8
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#define SCM_QUEUE_DELAY 5
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struct scm_blk_dev {
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struct tasklet_struct tasklet;
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struct request_queue *rq;
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struct gendisk *gendisk;
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struct scm_device *scmdev;
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spinlock_t rq_lock; /* guard the request queue */
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spinlock_t lock; /* guard the rest of the blockdev */
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atomic_t queued_reqs;
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enum {SCM_OPER, SCM_WR_PROHIBIT} state;
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struct list_head finished_requests;
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#ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE
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struct list_head cluster_list;
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#endif
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};
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struct scm_request {
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struct scm_blk_dev *bdev;
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struct aidaw *next_aidaw;
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struct request **request;
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struct aob *aob;
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struct list_head list;
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u8 retries;
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int error;
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#ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE
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struct {
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enum {CLUSTER_NONE, CLUSTER_READ, CLUSTER_WRITE} state;
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struct list_head list;
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void **buf;
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} cluster;
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#endif
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};
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#define to_aobrq(rq) container_of((void *) rq, struct aob_rq_header, data)
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int scm_blk_dev_setup(struct scm_blk_dev *, struct scm_device *);
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void scm_blk_dev_cleanup(struct scm_blk_dev *);
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void scm_blk_set_available(struct scm_blk_dev *);
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void scm_blk_irq(struct scm_device *, void *, int);
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void scm_request_finish(struct scm_request *);
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void scm_request_requeue(struct scm_request *);
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struct aidaw *scm_aidaw_fetch(struct scm_request *scmrq, unsigned int bytes);
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int scm_drv_init(void);
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void scm_drv_cleanup(void);
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#ifdef CONFIG_SCM_BLOCK_CLUSTER_WRITE
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void __scm_free_rq_cluster(struct scm_request *);
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int __scm_alloc_rq_cluster(struct scm_request *);
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void scm_request_cluster_init(struct scm_request *);
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bool scm_reserve_cluster(struct scm_request *);
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void scm_release_cluster(struct scm_request *);
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void scm_blk_dev_cluster_setup(struct scm_blk_dev *);
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bool scm_need_cluster_request(struct scm_request *);
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void scm_initiate_cluster_request(struct scm_request *);
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void scm_cluster_request_irq(struct scm_request *);
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bool scm_test_cluster_request(struct scm_request *);
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bool scm_cluster_size_valid(void);
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#else /* CONFIG_SCM_BLOCK_CLUSTER_WRITE */
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static inline void __scm_free_rq_cluster(struct scm_request *scmrq) {}
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static inline int __scm_alloc_rq_cluster(struct scm_request *scmrq)
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{
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return 0;
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}
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static inline void scm_request_cluster_init(struct scm_request *scmrq) {}
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static inline bool scm_reserve_cluster(struct scm_request *scmrq)
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{
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return true;
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}
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static inline void scm_release_cluster(struct scm_request *scmrq) {}
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static inline void scm_blk_dev_cluster_setup(struct scm_blk_dev *bdev) {}
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static inline bool scm_need_cluster_request(struct scm_request *scmrq)
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{
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return false;
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}
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static inline void scm_initiate_cluster_request(struct scm_request *scmrq) {}
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static inline void scm_cluster_request_irq(struct scm_request *scmrq) {}
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static inline bool scm_test_cluster_request(struct scm_request *scmrq)
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{
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return false;
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}
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static inline bool scm_cluster_size_valid(void)
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{
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return true;
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}
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#endif /* CONFIG_SCM_BLOCK_CLUSTER_WRITE */
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extern debug_info_t *scm_debug;
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#define SCM_LOG(imp, txt) do { \
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debug_text_event(scm_debug, imp, txt); \
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} while (0)
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static inline void SCM_LOG_HEX(int level, void *data, int length)
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{
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if (!debug_level_enabled(scm_debug, level))
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return;
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while (length > 0) {
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debug_event(scm_debug, level, data, length);
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length -= scm_debug->buf_size;
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data += scm_debug->buf_size;
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}
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}
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static inline void SCM_LOG_STATE(int level, struct scm_device *scmdev)
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{
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struct {
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u64 address;
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u8 oper_state;
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u8 rank;
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} __packed data = {
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.address = scmdev->address,
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.oper_state = scmdev->attrs.oper_state,
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.rank = scmdev->attrs.rank,
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};
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SCM_LOG_HEX(level, &data, sizeof(data));
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}
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#endif /* SCM_BLK_H */
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