drivers/mmc/host/mmc_hsq.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef LINUX_MMC_HSQ_H
   3 #define LINUX_MMC_HSQ_H
   4
   5 #define HSQ_NUM_SLOTS   64
   6 #define HSQ_INVALID_TAG HSQ_NUM_SLOTS
   7
   8 /*
   9  * For MMC host software queue, we only allow 2 requests in
  10  * flight to avoid a long latency.
  11  */
  12 #define HSQ_NORMAL_DEPTH        2
  13 /*
  14  * For 4k random writes, we allow hsq_depth to increase to 5
  15  * for better performance.
  16  */
  17 #define HSQ_PERFORMANCE_DEPTH   5
  18
  19 struct hsq_slot {
  20         struct mmc_request *mrq;
  21 };
  22
  23 struct mmc_hsq {
  24         struct mmc_host *mmc;
  25         struct mmc_request *mrq;
  26         wait_queue_head_t wait_queue;
  27         struct hsq_slot *slot;
  28         spinlock_t lock;
  29         struct work_struct retry_work;
  30
  31         int next_tag;
  32         int num_slots;
  33         int qcnt;
  34         int tail_tag;
  35         int tag_slot[HSQ_NUM_SLOTS];
  36
  37         bool enabled;
  38         bool waiting_for_idle;
  39         bool recovery_halt;
  40 };
  41
  42 int mmc_hsq_init(struct mmc_hsq *hsq, struct mmc_host *mmc);
  43 void mmc_hsq_suspend(struct mmc_host *mmc);
  44 int mmc_hsq_resume(struct mmc_host *mmc);
  45 bool mmc_hsq_finalize_request(struct mmc_host *mmc, struct mmc_request *mrq);
  46
  47 #endif