![Kyungmin Park](/assets/img/avatar_default.png)
In the v4.5, there's no secure erase & trim support. Instead it supports the sanitize feature. Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Chris Ball <cjb@laptop.org>
434 lines
10 KiB
C
434 lines
10 KiB
C
/*
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* linux/drivers/mmc/card/queue.c
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*
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* Copyright (C) 2003 Russell King, All Rights Reserved.
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* Copyright 2006-2007 Pierre Ossman
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/blkdev.h>
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#include <linux/freezer.h>
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#include <linux/kthread.h>
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#include <linux/scatterlist.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/host.h>
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#include "queue.h"
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#define MMC_QUEUE_BOUNCESZ 65536
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#define MMC_QUEUE_SUSPENDED (1 << 0)
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/*
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* Prepare a MMC request. This just filters out odd stuff.
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*/
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static int mmc_prep_request(struct request_queue *q, struct request *req)
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{
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/*
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* We only like normal block requests and discards.
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*/
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if (req->cmd_type != REQ_TYPE_FS && !(req->cmd_flags & REQ_DISCARD)) {
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blk_dump_rq_flags(req, "MMC bad request");
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return BLKPREP_KILL;
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}
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req->cmd_flags |= REQ_DONTPREP;
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return BLKPREP_OK;
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}
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static int mmc_queue_thread(void *d)
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{
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struct mmc_queue *mq = d;
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struct request_queue *q = mq->queue;
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current->flags |= PF_MEMALLOC;
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down(&mq->thread_sem);
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do {
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struct request *req = NULL;
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struct mmc_queue_req *tmp;
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spin_lock_irq(q->queue_lock);
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set_current_state(TASK_INTERRUPTIBLE);
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req = blk_fetch_request(q);
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mq->mqrq_cur->req = req;
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spin_unlock_irq(q->queue_lock);
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if (req || mq->mqrq_prev->req) {
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set_current_state(TASK_RUNNING);
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mq->issue_fn(mq, req);
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} else {
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if (kthread_should_stop()) {
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set_current_state(TASK_RUNNING);
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break;
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}
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up(&mq->thread_sem);
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schedule();
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down(&mq->thread_sem);
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}
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/* Current request becomes previous request and vice versa. */
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mq->mqrq_prev->brq.mrq.data = NULL;
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mq->mqrq_prev->req = NULL;
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tmp = mq->mqrq_prev;
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mq->mqrq_prev = mq->mqrq_cur;
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mq->mqrq_cur = tmp;
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} while (1);
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up(&mq->thread_sem);
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return 0;
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}
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/*
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* Generic MMC request handler. This is called for any queue on a
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* particular host. When the host is not busy, we look for a request
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* on any queue on this host, and attempt to issue it. This may
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* not be the queue we were asked to process.
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*/
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static void mmc_request(struct request_queue *q)
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{
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struct mmc_queue *mq = q->queuedata;
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struct request *req;
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if (!mq) {
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while ((req = blk_fetch_request(q)) != NULL) {
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req->cmd_flags |= REQ_QUIET;
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__blk_end_request_all(req, -EIO);
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}
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return;
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}
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if (!mq->mqrq_cur->req && !mq->mqrq_prev->req)
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wake_up_process(mq->thread);
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}
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static struct scatterlist *mmc_alloc_sg(int sg_len, int *err)
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{
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struct scatterlist *sg;
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sg = kmalloc(sizeof(struct scatterlist)*sg_len, GFP_KERNEL);
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if (!sg)
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*err = -ENOMEM;
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else {
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*err = 0;
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sg_init_table(sg, sg_len);
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}
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return sg;
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}
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static void mmc_queue_setup_discard(struct request_queue *q,
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struct mmc_card *card)
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{
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unsigned max_discard;
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max_discard = mmc_calc_max_discard(card);
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if (!max_discard)
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return;
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queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
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q->limits.max_discard_sectors = max_discard;
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if (card->erased_byte == 0)
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q->limits.discard_zeroes_data = 1;
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q->limits.discard_granularity = card->pref_erase << 9;
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/* granularity must not be greater than max. discard */
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if (card->pref_erase > max_discard)
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q->limits.discard_granularity = 0;
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if (mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))
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queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q);
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}
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/**
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* mmc_init_queue - initialise a queue structure.
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* @mq: mmc queue
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* @card: mmc card to attach this queue
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* @lock: queue lock
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* @subname: partition subname
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*
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* Initialise a MMC card request queue.
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*/
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int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
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spinlock_t *lock, const char *subname)
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{
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struct mmc_host *host = card->host;
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u64 limit = BLK_BOUNCE_HIGH;
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int ret;
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struct mmc_queue_req *mqrq_cur = &mq->mqrq[0];
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struct mmc_queue_req *mqrq_prev = &mq->mqrq[1];
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if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
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limit = *mmc_dev(host)->dma_mask;
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mq->card = card;
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mq->queue = blk_init_queue(mmc_request, lock);
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if (!mq->queue)
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return -ENOMEM;
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memset(&mq->mqrq_cur, 0, sizeof(mq->mqrq_cur));
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memset(&mq->mqrq_prev, 0, sizeof(mq->mqrq_prev));
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mq->mqrq_cur = mqrq_cur;
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mq->mqrq_prev = mqrq_prev;
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mq->queue->queuedata = mq;
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blk_queue_prep_rq(mq->queue, mmc_prep_request);
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queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
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if (mmc_can_erase(card))
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mmc_queue_setup_discard(mq->queue, card);
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#ifdef CONFIG_MMC_BLOCK_BOUNCE
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if (host->max_segs == 1) {
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unsigned int bouncesz;
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bouncesz = MMC_QUEUE_BOUNCESZ;
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if (bouncesz > host->max_req_size)
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bouncesz = host->max_req_size;
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if (bouncesz > host->max_seg_size)
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bouncesz = host->max_seg_size;
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if (bouncesz > (host->max_blk_count * 512))
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bouncesz = host->max_blk_count * 512;
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if (bouncesz > 512) {
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mqrq_cur->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
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if (!mqrq_cur->bounce_buf) {
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pr_warning("%s: unable to "
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"allocate bounce cur buffer\n",
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mmc_card_name(card));
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}
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mqrq_prev->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
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if (!mqrq_prev->bounce_buf) {
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pr_warning("%s: unable to "
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"allocate bounce prev buffer\n",
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mmc_card_name(card));
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kfree(mqrq_cur->bounce_buf);
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mqrq_cur->bounce_buf = NULL;
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}
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}
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if (mqrq_cur->bounce_buf && mqrq_prev->bounce_buf) {
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blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY);
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blk_queue_max_hw_sectors(mq->queue, bouncesz / 512);
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blk_queue_max_segments(mq->queue, bouncesz / 512);
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blk_queue_max_segment_size(mq->queue, bouncesz);
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mqrq_cur->sg = mmc_alloc_sg(1, &ret);
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if (ret)
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goto cleanup_queue;
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mqrq_cur->bounce_sg =
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mmc_alloc_sg(bouncesz / 512, &ret);
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if (ret)
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goto cleanup_queue;
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mqrq_prev->sg = mmc_alloc_sg(1, &ret);
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if (ret)
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goto cleanup_queue;
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mqrq_prev->bounce_sg =
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mmc_alloc_sg(bouncesz / 512, &ret);
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if (ret)
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goto cleanup_queue;
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}
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}
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#endif
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if (!mqrq_cur->bounce_buf && !mqrq_prev->bounce_buf) {
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blk_queue_bounce_limit(mq->queue, limit);
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blk_queue_max_hw_sectors(mq->queue,
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min(host->max_blk_count, host->max_req_size / 512));
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blk_queue_max_segments(mq->queue, host->max_segs);
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blk_queue_max_segment_size(mq->queue, host->max_seg_size);
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mqrq_cur->sg = mmc_alloc_sg(host->max_segs, &ret);
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if (ret)
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goto cleanup_queue;
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mqrq_prev->sg = mmc_alloc_sg(host->max_segs, &ret);
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if (ret)
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goto cleanup_queue;
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}
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sema_init(&mq->thread_sem, 1);
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mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd/%d%s",
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host->index, subname ? subname : "");
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if (IS_ERR(mq->thread)) {
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ret = PTR_ERR(mq->thread);
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goto free_bounce_sg;
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}
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return 0;
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free_bounce_sg:
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kfree(mqrq_cur->bounce_sg);
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mqrq_cur->bounce_sg = NULL;
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kfree(mqrq_prev->bounce_sg);
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mqrq_prev->bounce_sg = NULL;
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cleanup_queue:
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kfree(mqrq_cur->sg);
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mqrq_cur->sg = NULL;
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kfree(mqrq_cur->bounce_buf);
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mqrq_cur->bounce_buf = NULL;
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kfree(mqrq_prev->sg);
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mqrq_prev->sg = NULL;
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kfree(mqrq_prev->bounce_buf);
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mqrq_prev->bounce_buf = NULL;
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blk_cleanup_queue(mq->queue);
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return ret;
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}
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void mmc_cleanup_queue(struct mmc_queue *mq)
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{
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struct request_queue *q = mq->queue;
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unsigned long flags;
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struct mmc_queue_req *mqrq_cur = mq->mqrq_cur;
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struct mmc_queue_req *mqrq_prev = mq->mqrq_prev;
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/* Make sure the queue isn't suspended, as that will deadlock */
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mmc_queue_resume(mq);
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/* Then terminate our worker thread */
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kthread_stop(mq->thread);
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/* Empty the queue */
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spin_lock_irqsave(q->queue_lock, flags);
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q->queuedata = NULL;
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blk_start_queue(q);
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spin_unlock_irqrestore(q->queue_lock, flags);
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kfree(mqrq_cur->bounce_sg);
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mqrq_cur->bounce_sg = NULL;
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kfree(mqrq_cur->sg);
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mqrq_cur->sg = NULL;
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kfree(mqrq_cur->bounce_buf);
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mqrq_cur->bounce_buf = NULL;
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kfree(mqrq_prev->bounce_sg);
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mqrq_prev->bounce_sg = NULL;
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kfree(mqrq_prev->sg);
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mqrq_prev->sg = NULL;
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kfree(mqrq_prev->bounce_buf);
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mqrq_prev->bounce_buf = NULL;
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mq->card = NULL;
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}
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EXPORT_SYMBOL(mmc_cleanup_queue);
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/**
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* mmc_queue_suspend - suspend a MMC request queue
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* @mq: MMC queue to suspend
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*
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* Stop the block request queue, and wait for our thread to
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* complete any outstanding requests. This ensures that we
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* won't suspend while a request is being processed.
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*/
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void mmc_queue_suspend(struct mmc_queue *mq)
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{
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struct request_queue *q = mq->queue;
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unsigned long flags;
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if (!(mq->flags & MMC_QUEUE_SUSPENDED)) {
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mq->flags |= MMC_QUEUE_SUSPENDED;
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spin_lock_irqsave(q->queue_lock, flags);
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blk_stop_queue(q);
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spin_unlock_irqrestore(q->queue_lock, flags);
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down(&mq->thread_sem);
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}
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}
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/**
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* mmc_queue_resume - resume a previously suspended MMC request queue
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* @mq: MMC queue to resume
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*/
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void mmc_queue_resume(struct mmc_queue *mq)
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{
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struct request_queue *q = mq->queue;
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unsigned long flags;
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if (mq->flags & MMC_QUEUE_SUSPENDED) {
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mq->flags &= ~MMC_QUEUE_SUSPENDED;
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up(&mq->thread_sem);
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spin_lock_irqsave(q->queue_lock, flags);
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blk_start_queue(q);
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spin_unlock_irqrestore(q->queue_lock, flags);
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}
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}
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/*
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* Prepare the sg list(s) to be handed of to the host driver
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*/
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unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq)
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{
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unsigned int sg_len;
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size_t buflen;
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struct scatterlist *sg;
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int i;
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if (!mqrq->bounce_buf)
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return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
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BUG_ON(!mqrq->bounce_sg);
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sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
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mqrq->bounce_sg_len = sg_len;
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buflen = 0;
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for_each_sg(mqrq->bounce_sg, sg, sg_len, i)
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buflen += sg->length;
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sg_init_one(mqrq->sg, mqrq->bounce_buf, buflen);
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return 1;
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}
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/*
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* If writing, bounce the data to the buffer before the request
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* is sent to the host driver
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*/
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void mmc_queue_bounce_pre(struct mmc_queue_req *mqrq)
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{
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if (!mqrq->bounce_buf)
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return;
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if (rq_data_dir(mqrq->req) != WRITE)
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return;
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sg_copy_to_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
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mqrq->bounce_buf, mqrq->sg[0].length);
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}
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/*
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* If reading, bounce the data from the buffer after the request
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* has been handled by the host driver
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*/
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void mmc_queue_bounce_post(struct mmc_queue_req *mqrq)
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{
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if (!mqrq->bounce_buf)
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return;
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if (rq_data_dir(mqrq->req) != READ)
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return;
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sg_copy_from_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
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mqrq->bounce_buf, mqrq->sg[0].length);
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}
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