mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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627c3ccfb4
If we don't have the block layer enabled, we do not present card status and extcsd in the debugfs. Debugfs is not ABI, and maintaining files of no relevance for non-block devices comes at a high maintenance cost if we shall support it with the block layer compiled out. The debugfs entries suffer from all the same starvation issues as the other userspace things, under e.g. a heavy dd operation. The expected number of debugfs users utilizing these two debugfs files is already low as there is an ioctl() to get the same information using the mmc-tools, and of these few users the expected number of people using it on SDIO or combo cards are expected to be zero. It is therefore logical to move this over to the block layer when it is enabled, using the new custom requests and issue it using the block request queue. On the other hand it moves some debugfs code from debugfs.c and into block.c. Tested during heavy dd load by cat:in the status file. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
#ifndef MMC_QUEUE_H
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#define MMC_QUEUE_H
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#include <linux/types.h>
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#include <linux/blkdev.h>
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#include <linux/blk-mq.h>
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#include <linux/mmc/core.h>
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#include <linux/mmc/host.h>
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static inline struct mmc_queue_req *req_to_mmc_queue_req(struct request *rq)
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{
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return blk_mq_rq_to_pdu(rq);
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}
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struct mmc_queue_req;
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static inline struct request *mmc_queue_req_to_req(struct mmc_queue_req *mqr)
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{
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return blk_mq_rq_from_pdu(mqr);
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}
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struct task_struct;
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struct mmc_blk_data;
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struct mmc_blk_ioc_data;
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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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int retune_retry_done;
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};
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/**
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* enum mmc_drv_op - enumerates the operations in the mmc_queue_req
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* @MMC_DRV_OP_IOCTL: ioctl operation
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* @MMC_DRV_OP_BOOT_WP: write protect boot partitions
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* @MMC_DRV_OP_GET_CARD_STATUS: get card status
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* @MMC_DRV_OP_GET_EXT_CSD: get the EXT CSD from an eMMC card
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*/
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enum mmc_drv_op {
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MMC_DRV_OP_IOCTL,
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MMC_DRV_OP_BOOT_WP,
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MMC_DRV_OP_GET_CARD_STATUS,
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MMC_DRV_OP_GET_EXT_CSD,
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};
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struct mmc_queue_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 areq;
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enum mmc_drv_op drv_op;
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int drv_op_result;
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void *drv_op_data;
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unsigned int ioc_count;
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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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bool suspended;
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bool asleep;
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struct mmc_blk_data *blkdata;
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struct request_queue *queue;
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/*
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* FIXME: this counter is not a very reliable way of keeping
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* track of how many requests that are ongoing. Switch to just
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* letting the block core keep track of requests and per-request
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* associated mmc_queue_req data.
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*/
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int qcnt;
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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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extern int mmc_access_rpmb(struct mmc_queue *);
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#endif
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