mmc: block: Move files to core

Once upon a time it made sense to keep the mmc block device driver and its
related code, in its own directory called card. Over time, more an more
functions/structures have become shared through generic mmc header files,
between the core and the card directory. In other words, the relationship
between them has become closer.

By sharing functions/structures via generic header files, it becomes easy
for outside users to abuse them. In a way to avoid that from happen, let's
move the files from card directory into the core directory, as it enables
us to move definitions of functions/structures into mmc core specific
header files.

Note, this is only the first step in providing a cleaner mmc interface for
outside users. Following changes will do the actual cleanup, as that is not
part of this change.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 0 insertions, 491 deletions

diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
deleted file mode 100644
index cf29809f69e4..000000000000
--- a/drivers/mmc/card/queue.c
+++ /dev/null
@@ -1,491 +0,0 @@
-/*
- *  linux/drivers/mmc/card/queue.c
- *
- *  Copyright (C) 2003 Russell King, All Rights Reserved.
- *  Copyright 2006-2007 Pierre Ossman
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- */
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/blkdev.h>
-#include <linux/freezer.h>
-#include <linux/kthread.h>
-#include <linux/scatterlist.h>
-#include <linux/dma-mapping.h>
-
-#include <linux/mmc/card.h>
-#include <linux/mmc/host.h>
-
-#include "queue.h"
-#include "block.h"
-
-#define MMC_QUEUE_BOUNCESZ	65536
-
-/*
- * Prepare a MMC request. This just filters out odd stuff.
- */
-static int mmc_prep_request(struct request_queue *q, struct request *req)
-{
-	struct mmc_queue *mq = q->queuedata;
-
-	/*
-	 * We only like normal block requests and discards.
-	 */
-	if (req->cmd_type != REQ_TYPE_FS && req_op(req) != REQ_OP_DISCARD &&
-	    req_op(req) != REQ_OP_SECURE_ERASE) {
-		blk_dump_rq_flags(req, "MMC bad request");
-		return BLKPREP_KILL;
-	}
-
-	if (mq && (mmc_card_removed(mq->card) || mmc_access_rpmb(mq)))
-		return BLKPREP_KILL;
-
-	req->cmd_flags |= REQ_DONTPREP;
-
-	return BLKPREP_OK;
-}
-
-static int mmc_queue_thread(void *d)
-{
-	struct mmc_queue *mq = d;
-	struct request_queue *q = mq->queue;
-	struct mmc_context_info *cntx = &mq->card->host->context_info;
-
-	current->flags |= PF_MEMALLOC;
-
-	down(&mq->thread_sem);
-	do {
-		struct request *req = NULL;
-
-		spin_lock_irq(q->queue_lock);
-		set_current_state(TASK_INTERRUPTIBLE);
-		req = blk_fetch_request(q);
-		mq->asleep = false;
-		cntx->is_waiting_last_req = false;
-		cntx->is_new_req = false;
-		if (!req) {
-			/*
-			 * Dispatch queue is empty so set flags for
-			 * mmc_request_fn() to wake us up.
-			 */
-			if (mq->mqrq_prev->req)
-				cntx->is_waiting_last_req = true;
-			else
-				mq->asleep = true;
-		}
-		mq->mqrq_cur->req = req;
-		spin_unlock_irq(q->queue_lock);
-
-		if (req || mq->mqrq_prev->req) {
-			bool req_is_special = mmc_req_is_special(req);
-
-			set_current_state(TASK_RUNNING);
-			mmc_blk_issue_rq(mq, req);
-			cond_resched();
-			if (mq->flags & MMC_QUEUE_NEW_REQUEST) {
-				mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
-				continue; /* fetch again */
-			}
-
-			/*
-			 * Current request becomes previous request
-			 * and vice versa.
-			 * In case of special requests, current request
-			 * has been finished. Do not assign it to previous
-			 * request.
-			 */
-			if (req_is_special)
-				mq->mqrq_cur->req = NULL;
-
-			mq->mqrq_prev->brq.mrq.data = NULL;
-			mq->mqrq_prev->req = NULL;
-			swap(mq->mqrq_prev, mq->mqrq_cur);
-		} else {
-			if (kthread_should_stop()) {
-				set_current_state(TASK_RUNNING);
-				break;
-			}
-			up(&mq->thread_sem);
-			schedule();
-			down(&mq->thread_sem);
-		}
-	} while (1);
-	up(&mq->thread_sem);
-
-	return 0;
-}
-
-/*
- * Generic MMC request handler.  This is called for any queue on a
- * particular host.  When the host is not busy, we look for a request
- * on any queue on this host, and attempt to issue it.  This may
- * not be the queue we were asked to process.
- */
-static void mmc_request_fn(struct request_queue *q)
-{
-	struct mmc_queue *mq = q->queuedata;
-	struct request *req;
-	struct mmc_context_info *cntx;
-
-	if (!mq) {
-		while ((req = blk_fetch_request(q)) != NULL) {
-			req->cmd_flags |= REQ_QUIET;
-			__blk_end_request_all(req, -EIO);
-		}
-		return;
-	}
-
-	cntx = &mq->card->host->context_info;
-
-	if (cntx->is_waiting_last_req) {
-		cntx->is_new_req = true;
-		wake_up_interruptible(&cntx->wait);
-	}
-
-	if (mq->asleep)
-		wake_up_process(mq->thread);
-}
-
-static struct scatterlist *mmc_alloc_sg(int sg_len, int *err)
-{
-	struct scatterlist *sg;
-
-	sg = kmalloc(sizeof(struct scatterlist)*sg_len, GFP_KERNEL);
-	if (!sg)
-		*err = -ENOMEM;
-	else {
-		*err = 0;
-		sg_init_table(sg, sg_len);
-	}
-
-	return sg;
-}
-
-static void mmc_queue_setup_discard(struct request_queue *q,
-				    struct mmc_card *card)
-{
-	unsigned max_discard;
-
-	max_discard = mmc_calc_max_discard(card);
-	if (!max_discard)
-		return;
-
-	queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
-	blk_queue_max_discard_sectors(q, max_discard);
-	if (card->erased_byte == 0 && !mmc_can_discard(card))
-		q->limits.discard_zeroes_data = 1;
-	q->limits.discard_granularity = card->pref_erase << 9;
-	/* granularity must not be greater than max. discard */
-	if (card->pref_erase > max_discard)
-		q->limits.discard_granularity = 0;
-	if (mmc_can_secure_erase_trim(card))
-		queue_flag_set_unlocked(QUEUE_FLAG_SECERASE, q);
-}
-
-#ifdef CONFIG_MMC_BLOCK_BOUNCE
-static bool mmc_queue_alloc_bounce_bufs(struct mmc_queue *mq,
-					unsigned int bouncesz)
-{
-	int i;
-
-	for (i = 0; i < mq->qdepth; i++) {
-		mq->mqrq[i].bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
-		if (!mq->mqrq[i].bounce_buf)
-			goto out_err;
-	}
-
-	return true;
-
-out_err:
-	while (--i >= 0) {
-		kfree(mq->mqrq[i].bounce_buf);
-		mq->mqrq[i].bounce_buf = NULL;
-	}
-	pr_warn("%s: unable to allocate bounce buffers\n",
-		mmc_card_name(mq->card));
-	return false;
-}
-
-static int mmc_queue_alloc_bounce_sgs(struct mmc_queue *mq,
-				      unsigned int bouncesz)
-{
-	int i, ret;
-
-	for (i = 0; i < mq->qdepth; i++) {
-		mq->mqrq[i].sg = mmc_alloc_sg(1, &ret);
-		if (ret)
-			return ret;
-
-		mq->mqrq[i].bounce_sg = mmc_alloc_sg(bouncesz / 512, &ret);
-		if (ret)
-			return ret;
-	}
-
-	return 0;
-}
-#endif
-
-static int mmc_queue_alloc_sgs(struct mmc_queue *mq, int max_segs)
-{
-	int i, ret;
-
-	for (i = 0; i < mq->qdepth; i++) {
-		mq->mqrq[i].sg = mmc_alloc_sg(max_segs, &ret);
-		if (ret)
-			return ret;
-	}
-
-	return 0;
-}
-
-static void mmc_queue_req_free_bufs(struct mmc_queue_req *mqrq)
-{
-	kfree(mqrq->bounce_sg);
-	mqrq->bounce_sg = NULL;
-
-	kfree(mqrq->sg);
-	mqrq->sg = NULL;
-
-	kfree(mqrq->bounce_buf);
-	mqrq->bounce_buf = NULL;
-}
-
-static void mmc_queue_reqs_free_bufs(struct mmc_queue *mq)
-{
-	int i;
-
-	for (i = 0; i < mq->qdepth; i++)
-		mmc_queue_req_free_bufs(&mq->mqrq[i]);
-}
-
-/**
- * mmc_init_queue - initialise a queue structure.
- * @mq: mmc queue
- * @card: mmc card to attach this queue
- * @lock: queue lock
- * @subname: partition subname
- *
- * Initialise a MMC card request queue.
- */
-int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
-		   spinlock_t *lock, const char *subname)
-{
-	struct mmc_host *host = card->host;
-	u64 limit = BLK_BOUNCE_HIGH;
-	bool bounce = false;
-	int ret = -ENOMEM;
-
-	if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
-		limit = (u64)dma_max_pfn(mmc_dev(host)) << PAGE_SHIFT;
-
-	mq->card = card;
-	mq->queue = blk_init_queue(mmc_request_fn, lock);
-	if (!mq->queue)
-		return -ENOMEM;
-
-	mq->qdepth = 2;
-	mq->mqrq = kcalloc(mq->qdepth, sizeof(struct mmc_queue_req),
-			   GFP_KERNEL);
-	if (!mq->mqrq)
-		goto blk_cleanup;
-	mq->mqrq_cur = &mq->mqrq[0];
-	mq->mqrq_prev = &mq->mqrq[1];
-	mq->queue->queuedata = mq;
-
-	blk_queue_prep_rq(mq->queue, mmc_prep_request);
-	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
-	queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, mq->queue);
-	if (mmc_can_erase(card))
-		mmc_queue_setup_discard(mq->queue, card);
-
-#ifdef CONFIG_MMC_BLOCK_BOUNCE
-	if (host->max_segs == 1) {
-		unsigned int bouncesz;
-
-		bouncesz = MMC_QUEUE_BOUNCESZ;
-
-		if (bouncesz > host->max_req_size)
-			bouncesz = host->max_req_size;
-		if (bouncesz > host->max_seg_size)
-			bouncesz = host->max_seg_size;
-		if (bouncesz > (host->max_blk_count * 512))
-			bouncesz = host->max_blk_count * 512;
-
-		if (bouncesz > 512 &&
-		    mmc_queue_alloc_bounce_bufs(mq, bouncesz)) {
-			blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY);
-			blk_queue_max_hw_sectors(mq->queue, bouncesz / 512);
-			blk_queue_max_segments(mq->queue, bouncesz / 512);
-			blk_queue_max_segment_size(mq->queue, bouncesz);
-
-			ret = mmc_queue_alloc_bounce_sgs(mq, bouncesz);
-			if (ret)
-				goto cleanup_queue;
-			bounce = true;
-		}
-	}
-#endif
-
-	if (!bounce) {
-		blk_queue_bounce_limit(mq->queue, limit);
-		blk_queue_max_hw_sectors(mq->queue,
-			min(host->max_blk_count, host->max_req_size / 512));
-		blk_queue_max_segments(mq->queue, host->max_segs);
-		blk_queue_max_segment_size(mq->queue, host->max_seg_size);
-
-		ret = mmc_queue_alloc_sgs(mq, host->max_segs);
-		if (ret)
-			goto cleanup_queue;
-	}
-
-	sema_init(&mq->thread_sem, 1);
-
-	mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd/%d%s",
-		host->index, subname ? subname : "");
-
-	if (IS_ERR(mq->thread)) {
-		ret = PTR_ERR(mq->thread);
-		goto cleanup_queue;
-	}
-
-	return 0;
-
- cleanup_queue:
-	mmc_queue_reqs_free_bufs(mq);
-	kfree(mq->mqrq);
-	mq->mqrq = NULL;
-blk_cleanup:
-	blk_cleanup_queue(mq->queue);
-	return ret;
-}
-
-void mmc_cleanup_queue(struct mmc_queue *mq)
-{
-	struct request_queue *q = mq->queue;
-	unsigned long flags;
-
-	/* Make sure the queue isn't suspended, as that will deadlock */
-	mmc_queue_resume(mq);
-
-	/* Then terminate our worker thread */
-	kthread_stop(mq->thread);
-
-	/* Empty the queue */
-	spin_lock_irqsave(q->queue_lock, flags);
-	q->queuedata = NULL;
-	blk_start_queue(q);
-	spin_unlock_irqrestore(q->queue_lock, flags);
-
-	mmc_queue_reqs_free_bufs(mq);
-	kfree(mq->mqrq);
-	mq->mqrq = NULL;
-
-	mq->card = NULL;
-}
-EXPORT_SYMBOL(mmc_cleanup_queue);
-
-/**
- * mmc_queue_suspend - suspend a MMC request queue
- * @mq: MMC queue to suspend
- *
- * Stop the block request queue, and wait for our thread to
- * complete any outstanding requests.  This ensures that we
- * won't suspend while a request is being processed.
- */
-void mmc_queue_suspend(struct mmc_queue *mq)
-{
-	struct request_queue *q = mq->queue;
-	unsigned long flags;
-
-	if (!(mq->flags & MMC_QUEUE_SUSPENDED)) {
-		mq->flags |= MMC_QUEUE_SUSPENDED;
-
-		spin_lock_irqsave(q->queue_lock, flags);
-		blk_stop_queue(q);
-		spin_unlock_irqrestore(q->queue_lock, flags);
-
-		down(&mq->thread_sem);
-	}
-}
-
-/**
- * mmc_queue_resume - resume a previously suspended MMC request queue
- * @mq: MMC queue to resume
- */
-void mmc_queue_resume(struct mmc_queue *mq)
-{
-	struct request_queue *q = mq->queue;
-	unsigned long flags;
-
-	if (mq->flags & MMC_QUEUE_SUSPENDED) {
-		mq->flags &= ~MMC_QUEUE_SUSPENDED;
-
-		up(&mq->thread_sem);
-
-		spin_lock_irqsave(q->queue_lock, flags);
-		blk_start_queue(q);
-		spin_unlock_irqrestore(q->queue_lock, flags);
-	}
-}
-
-/*
- * Prepare the sg list(s) to be handed of to the host driver
- */
-unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq)
-{
-	unsigned int sg_len;
-	size_t buflen;
-	struct scatterlist *sg;
-	int i;
-
-	if (!mqrq->bounce_buf)
-		return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
-
-	sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
-
-	mqrq->bounce_sg_len = sg_len;
-
-	buflen = 0;
-	for_each_sg(mqrq->bounce_sg, sg, sg_len, i)
-		buflen += sg->length;
-
-	sg_init_one(mqrq->sg, mqrq->bounce_buf, buflen);
-
-	return 1;
-}
-
-/*
- * If writing, bounce the data to the buffer before the request
- * is sent to the host driver
- */
-void mmc_queue_bounce_pre(struct mmc_queue_req *mqrq)
-{
-	if (!mqrq->bounce_buf)
-		return;
-
-	if (rq_data_dir(mqrq->req) != WRITE)
-		return;
-
-	sg_copy_to_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
-		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);
-}