081e5b9636
The write packing control will ensure that read requests latency is not increased due to long write packed commands. The trigger for enabling the write packing is managing to pack several write requests. The number of potential packed requests that will trigger the packing can be configured via sysfs by writing the required value to: /sys/block/<block_dev_name>/num_wr_reqs_to_start_packing. The trigger for disabling the write packing is fetching a read request. Change-Id: I982170fa6dca9150ea4310bb546b838b7fd30e9b Signed-off-by: Maya Erez <merez@codeaurora.org>
64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
#ifndef MMC_QUEUE_H
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#define MMC_QUEUE_H
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struct request;
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struct task_struct;
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struct mmc_blk_request {
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struct mmc_request mrq;
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struct mmc_command sbc;
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struct mmc_command cmd;
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struct mmc_command stop;
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struct mmc_data data;
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};
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enum mmc_packed_cmd {
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MMC_PACKED_NONE = 0,
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MMC_PACKED_WRITE,
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};
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struct mmc_queue_req {
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struct request *req;
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struct mmc_blk_request brq;
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struct scatterlist *sg;
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char *bounce_buf;
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struct scatterlist *bounce_sg;
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unsigned int bounce_sg_len;
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struct mmc_async_req mmc_active;
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struct list_head packed_list;
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u32 packed_cmd_hdr[128];
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unsigned int packed_blocks;
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enum mmc_packed_cmd packed_cmd;
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int packed_fail_idx;
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u8 packed_num;
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};
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struct mmc_queue {
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struct mmc_card *card;
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struct task_struct *thread;
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struct semaphore thread_sem;
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unsigned int flags;
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int (*issue_fn)(struct mmc_queue *, struct request *);
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void *data;
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struct request_queue *queue;
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struct mmc_queue_req mqrq[2];
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struct mmc_queue_req *mqrq_cur;
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struct mmc_queue_req *mqrq_prev;
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bool wr_packing_enabled;
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int num_of_potential_packed_wr_reqs;
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int num_wr_reqs_to_start_packing;
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};
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extern int mmc_init_queue(struct mmc_queue *, struct mmc_card *, spinlock_t *,
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const char *);
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extern void mmc_cleanup_queue(struct mmc_queue *);
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extern void mmc_queue_suspend(struct mmc_queue *);
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extern void mmc_queue_resume(struct mmc_queue *);
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extern unsigned int mmc_queue_map_sg(struct mmc_queue *,
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struct mmc_queue_req *);
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extern void mmc_queue_bounce_pre(struct mmc_queue_req *);
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extern void mmc_queue_bounce_post(struct mmc_queue_req *);
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#endif
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