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By dynamically adjusting the host->hsq_depth, based upon the buffer size being 4k and that we get at least two I/O write requests in flight, we can improve the throughput a bit. This is typical for a random I/O write pattern. More precisely, by dynamically changing the number of requests in flight from 2 to 5, we can on some platforms observe ~4-5% increase in throughput. Signed-off-by: Wenchao Chen <wenchao.chen@unisoc.com> Link: https://lore.kernel.org/r/20230919074707.25517-3-wenchao.chen@unisoc.com [Ulf: Re-wrote the commitmsg, minor adjustment to the code - all to clarify.] Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
48 lines
1014 B
C
48 lines
1014 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef LINUX_MMC_HSQ_H
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#define LINUX_MMC_HSQ_H
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#define HSQ_NUM_SLOTS 64
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#define HSQ_INVALID_TAG HSQ_NUM_SLOTS
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/*
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* For MMC host software queue, we only allow 2 requests in
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* flight to avoid a long latency.
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*/
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#define HSQ_NORMAL_DEPTH 2
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/*
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* For 4k random writes, we allow hsq_depth to increase to 5
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* for better performance.
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*/
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#define HSQ_PERFORMANCE_DEPTH 5
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struct hsq_slot {
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struct mmc_request *mrq;
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};
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struct mmc_hsq {
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struct mmc_host *mmc;
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struct mmc_request *mrq;
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wait_queue_head_t wait_queue;
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struct hsq_slot *slot;
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spinlock_t lock;
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struct work_struct retry_work;
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int next_tag;
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int num_slots;
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int qcnt;
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int tail_tag;
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int tag_slot[HSQ_NUM_SLOTS];
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bool enabled;
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bool waiting_for_idle;
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bool recovery_halt;
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};
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int mmc_hsq_init(struct mmc_hsq *hsq, struct mmc_host *mmc);
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void mmc_hsq_suspend(struct mmc_host *mmc);
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int mmc_hsq_resume(struct mmc_host *mmc);
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bool mmc_hsq_finalize_request(struct mmc_host *mmc, struct mmc_request *mrq);
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#endif
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