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b9f98bd403
- Move files from the card directory to the core directory to enable future clean-ups of the generic mmc header files and interfaces. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJYURIiAAoJEP4mhCVzWIwpYAUQAL2qmTde04Qs/MjVtTCih3L0 +ZB0oK/ppNUwZTmAJlMhi1osKPmdRd1Kngv+7zEBnddrbVJDAYrM+T5Psd8WebM4 xUK0e3LnwuzFGskkgQ1mtd9qZHEniEdUg8Dq+nXSnGiesvCST2/uAAtjvFQHYr0R QK3U7hOyJBd1+L5LpPIIF+e/Ix7yaHobfYLGcGxRGULw5uhYiy3vbkpN7omD0hlQ 2EYdBFcHj1GHarDYFtD3BWUNGtT7GpC10iMueUYVuz+bzOjCAhEeZ0Lh6V7R6HCr ZVSeMEK45HegLHx81XMDGYqDfRUPgShjNKrAq8DxfzBXvQ+1iuq5Mh01Zrilcxfw nNbqNajc+OIXluxYRz5h3HHC02R4gGN6Uk/gx/H8a/eRRcM6a3irDLkLBpyvETpb pH1OkomaHg5B/dTH0cUFamK/fTDNr3Lv2HFcKJ9ALQxhgEAQwcsWaeAyvvUncFuU /uiyd6NEWo/19mHB905wF5R9oTv1WWrQGDmSHGJT51Br1BJf+W/2ZT9N9P12zweW d5ZvheGymUjQ6yFnv5ov6udTWdogy8qqAihGa4kwPbfpY+DwlcT+pN/bej1pYwqQ kUxCxBE84RciJzZbped9xDo10HSGVudlIZPMa8Jp0f/CbPYnwf+z3tP6Xt5wtwLh jAhBjdzkWvEdTAJfyYmw =U2+h -----END PGP SIGNATURE----- Merge tag 'mmc-v4.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc Pull another MMC update from Ulf Hansson: "Here's a second pull request for MMC for v4.10. As a matter of fact it's only one change that moves some mmc files around. I thought it was a good idea to get this into v4.10, as it gives us a nice and fresh base for v4.11. Summary: MMC core: - Move files from the card directory to the core directory to enable future clean-ups of the generic mmc header files and interfaces" * tag 'mmc-v4.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc: mmc: block: Move files to core
490 lines
11 KiB
C
490 lines
11 KiB
C
/*
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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/dma-mapping.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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#include "block.h"
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#define MMC_QUEUE_BOUNCESZ 65536
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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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struct mmc_queue *mq = q->queuedata;
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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_op(req) != REQ_OP_DISCARD &&
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req_op(req) != REQ_OP_SECURE_ERASE) {
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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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if (mq && (mmc_card_removed(mq->card) || mmc_access_rpmb(mq)))
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return BLKPREP_KILL;
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req->rq_flags |= RQF_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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struct mmc_context_info *cntx = &mq->card->host->context_info;
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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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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->asleep = false;
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cntx->is_waiting_last_req = false;
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cntx->is_new_req = false;
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if (!req) {
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/*
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* Dispatch queue is empty so set flags for
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* mmc_request_fn() to wake us up.
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*/
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if (mq->mqrq_prev->req)
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cntx->is_waiting_last_req = true;
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else
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mq->asleep = true;
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}
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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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bool req_is_special = mmc_req_is_special(req);
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set_current_state(TASK_RUNNING);
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mmc_blk_issue_rq(mq, req);
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cond_resched();
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if (mq->flags & MMC_QUEUE_NEW_REQUEST) {
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mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
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continue; /* fetch again */
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}
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/*
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* Current request becomes previous request
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* and vice versa.
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* In case of special requests, current request
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* has been finished. Do not assign it to previous
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* request.
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*/
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if (req_is_special)
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mq->mqrq_cur->req = NULL;
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mq->mqrq_prev->brq.mrq.data = NULL;
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mq->mqrq_prev->req = NULL;
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swap(mq->mqrq_prev, mq->mqrq_cur);
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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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} 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_fn(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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struct mmc_context_info *cntx;
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if (!mq) {
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while ((req = blk_fetch_request(q)) != NULL) {
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req->rq_flags |= RQF_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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cntx = &mq->card->host->context_info;
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if (cntx->is_waiting_last_req) {
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cntx->is_new_req = true;
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wake_up_interruptible(&cntx->wait);
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}
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if (mq->asleep)
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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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blk_queue_max_discard_sectors(q, max_discard);
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if (card->erased_byte == 0 && !mmc_can_discard(card))
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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))
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queue_flag_set_unlocked(QUEUE_FLAG_SECERASE, q);
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}
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#ifdef CONFIG_MMC_BLOCK_BOUNCE
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static bool mmc_queue_alloc_bounce_bufs(struct mmc_queue *mq,
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unsigned int bouncesz)
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{
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int i;
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for (i = 0; i < mq->qdepth; i++) {
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mq->mqrq[i].bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
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if (!mq->mqrq[i].bounce_buf)
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goto out_err;
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}
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return true;
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out_err:
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while (--i >= 0) {
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kfree(mq->mqrq[i].bounce_buf);
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mq->mqrq[i].bounce_buf = NULL;
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}
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pr_warn("%s: unable to allocate bounce buffers\n",
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mmc_card_name(mq->card));
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return false;
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}
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static int mmc_queue_alloc_bounce_sgs(struct mmc_queue *mq,
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unsigned int bouncesz)
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{
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int i, ret;
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for (i = 0; i < mq->qdepth; i++) {
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mq->mqrq[i].sg = mmc_alloc_sg(1, &ret);
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if (ret)
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return ret;
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mq->mqrq[i].bounce_sg = mmc_alloc_sg(bouncesz / 512, &ret);
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if (ret)
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return ret;
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}
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return 0;
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}
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#endif
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static int mmc_queue_alloc_sgs(struct mmc_queue *mq, int max_segs)
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{
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int i, ret;
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for (i = 0; i < mq->qdepth; i++) {
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mq->mqrq[i].sg = mmc_alloc_sg(max_segs, &ret);
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if (ret)
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return ret;
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}
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return 0;
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}
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static void mmc_queue_req_free_bufs(struct mmc_queue_req *mqrq)
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{
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kfree(mqrq->bounce_sg);
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mqrq->bounce_sg = NULL;
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kfree(mqrq->sg);
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mqrq->sg = NULL;
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kfree(mqrq->bounce_buf);
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mqrq->bounce_buf = NULL;
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}
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static void mmc_queue_reqs_free_bufs(struct mmc_queue *mq)
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{
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int i;
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for (i = 0; i < mq->qdepth; i++)
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mmc_queue_req_free_bufs(&mq->mqrq[i]);
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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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bool bounce = false;
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int ret = -ENOMEM;
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if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
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limit = (u64)dma_max_pfn(mmc_dev(host)) << PAGE_SHIFT;
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mq->card = card;
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mq->queue = blk_init_queue(mmc_request_fn, lock);
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if (!mq->queue)
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return -ENOMEM;
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mq->qdepth = 2;
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mq->mqrq = kcalloc(mq->qdepth, sizeof(struct mmc_queue_req),
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GFP_KERNEL);
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if (!mq->mqrq)
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goto blk_cleanup;
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mq->mqrq_cur = &mq->mqrq[0];
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mq->mqrq_prev = &mq->mqrq[1];
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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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queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, 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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mmc_queue_alloc_bounce_bufs(mq, bouncesz)) {
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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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ret = mmc_queue_alloc_bounce_sgs(mq, bouncesz);
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if (ret)
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goto cleanup_queue;
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bounce = true;
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}
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}
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#endif
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if (!bounce) {
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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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ret = mmc_queue_alloc_sgs(mq, host->max_segs);
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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 cleanup_queue;
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}
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return 0;
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cleanup_queue:
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mmc_queue_reqs_free_bufs(mq);
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kfree(mq->mqrq);
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mq->mqrq = NULL;
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blk_cleanup:
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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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/* 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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mmc_queue_reqs_free_bufs(mq);
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kfree(mq->mqrq);
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mq->mqrq = 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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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);
|
|
}
|
|
|
|
/*
|
|
* If reading, bounce the data from the buffer after the request
|
|
* has been handled by the host driver
|
|
*/
|
|
void mmc_queue_bounce_post(struct mmc_queue_req *mqrq)
|
|
{
|
|
if (!mqrq->bounce_buf)
|
|
return;
|
|
|
|
if (rq_data_dir(mqrq->req) != READ)
|
|
return;
|
|
|
|
sg_copy_from_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
|
|
mqrq->bounce_buf, mqrq->sg[0].length);
|
|
}
|