1 files changed, 438 insertions, 0 deletions

diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
new file mode 100644
index 00000000..996f8e36
--- /dev/null
+++ b/drivers/mmc/card/queue.c
@@ -0,0 +1,438 @@
+/*
+ *  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/mmc/card.h>
+#include <linux/mmc/host.h>
+#include "queue.h"
+
+#define MMC_QUEUE_BOUNCESZ	65536
+
+#define MMC_QUEUE_SUSPENDED	(1 << 0)
+
+/*
+ * 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->cmd_flags & REQ_DISCARD)) {
+		blk_dump_rq_flags(req, "MMC bad request");
+		return BLKPREP_KILL;
+	}
+
+	if (mq && mmc_card_removed(mq->card))
+		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;
+
+	current->flags |= PF_MEMALLOC;
+
+	down(&mq->thread_sem);
+	do {
+		struct request *req = NULL;
+		struct mmc_queue_req *tmp;
+
+		spin_lock_irq(q->queue_lock);
+		set_current_state(TASK_INTERRUPTIBLE);
+		req = blk_fetch_request(q);
+		mq->mqrq_cur->req = req;
+		spin_unlock_irq(q->queue_lock);
+
+		if (req || mq->mqrq_prev->req) {
+			set_current_state(TASK_RUNNING);
+			mq->issue_fn(mq, req);
+		} else {
+			if (kthread_should_stop()) {
+				set_current_state(TASK_RUNNING);
+				break;
+			}
+			up(&mq->thread_sem);
+			schedule();
+			down(&mq->thread_sem);
+		}
+
+		/* Current request becomes previous request and vice versa. */
+		mq->mqrq_prev->brq.mrq.data = NULL;
+		mq->mqrq_prev->req = NULL;
+		tmp = mq->mqrq_prev;
+		mq->mqrq_prev = mq->mqrq_cur;
+		mq->mqrq_cur = tmp;
+	} 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(struct request_queue *q)
+{
+	struct mmc_queue *mq = q->queuedata;
+	struct request *req;
+
+	if (!mq) {
+		while ((req = blk_fetch_request(q)) != NULL) {
+			req->cmd_flags |= REQ_QUIET;
+			__blk_end_request_all(req, -EIO);
+		}
+		return;
+	}
+
+	if (!mq->mqrq_cur->req && !mq->mqrq_prev->req)
+		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);
+	q->limits.max_discard_sectors = 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) || mmc_can_sanitize(card))
+		queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q);
+}
+
+/**
+ * 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;
+	int ret;
+	struct mmc_queue_req *mqrq_cur = &mq->mqrq[0];
+	struct mmc_queue_req *mqrq_prev = &mq->mqrq[1];
+
+	if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
+		limit = *mmc_dev(host)->dma_mask;
+
+	mq->card = card;
+	mq->queue = blk_init_queue(mmc_request, lock);
+	if (!mq->queue)
+		return -ENOMEM;
+
+	memset(&mq->mqrq_cur, 0, sizeof(mq->mqrq_cur));
+	memset(&mq->mqrq_prev, 0, sizeof(mq->mqrq_prev));
+	mq->mqrq_cur = mqrq_cur;
+	mq->mqrq_prev = mqrq_prev;
+	mq->queue->queuedata = mq;
+
+	blk_queue_prep_rq(mq->queue, mmc_prep_request);
+	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, 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) {
+			mqrq_cur->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
+			if (!mqrq_cur->bounce_buf) {
+				pr_warning("%s: unable to "
+					"allocate bounce cur buffer\n",
+					mmc_card_name(card));
+			}
+			mqrq_prev->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
+			if (!mqrq_prev->bounce_buf) {
+				pr_warning("%s: unable to "
+					"allocate bounce prev buffer\n",
+					mmc_card_name(card));
+				kfree(mqrq_cur->bounce_buf);
+				mqrq_cur->bounce_buf = NULL;
+			}
+		}
+
+		if (mqrq_cur->bounce_buf && mqrq_prev->bounce_buf) {
+			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);
+
+			mqrq_cur->sg = mmc_alloc_sg(1, &ret);
+			if (ret)
+				goto cleanup_queue;
+
+			mqrq_cur->bounce_sg =
+				mmc_alloc_sg(bouncesz / 512, &ret);
+			if (ret)
+				goto cleanup_queue;
+
+			mqrq_prev->sg = mmc_alloc_sg(1, &ret);
+			if (ret)
+				goto cleanup_queue;
+
+			mqrq_prev->bounce_sg =
+				mmc_alloc_sg(bouncesz / 512, &ret);
+			if (ret)
+				goto cleanup_queue;
+		}
+	}
+#endif
+
+	if (!mqrq_cur->bounce_buf && !mqrq_prev->bounce_buf) {
+		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);
+
+		mqrq_cur->sg = mmc_alloc_sg(host->max_segs, &ret);
+		if (ret)
+			goto cleanup_queue;
+
+
+		mqrq_prev->sg = mmc_alloc_sg(host->max_segs, &ret);
+		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 free_bounce_sg;
+	}
+
+	return 0;
+ free_bounce_sg:
+	kfree(mqrq_cur->bounce_sg);
+	mqrq_cur->bounce_sg = NULL;
+	kfree(mqrq_prev->bounce_sg);
+	mqrq_prev->bounce_sg = NULL;
+
+ cleanup_queue:
+	kfree(mqrq_cur->sg);
+	mqrq_cur->sg = NULL;
+	kfree(mqrq_cur->bounce_buf);
+	mqrq_cur->bounce_buf = NULL;
+
+	kfree(mqrq_prev->sg);
+	mqrq_prev->sg = NULL;
+	kfree(mqrq_prev->bounce_buf);
+	mqrq_prev->bounce_buf = NULL;
+
+	blk_cleanup_queue(mq->queue);
+	return ret;
+}
+
+void mmc_cleanup_queue(struct mmc_queue *mq)
+{
+	struct request_queue *q = mq->queue;
+	unsigned long flags;
+	struct mmc_queue_req *mqrq_cur = mq->mqrq_cur;
+	struct mmc_queue_req *mqrq_prev = mq->mqrq_prev;
+
+	/* 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);
+
+	kfree(mqrq_cur->bounce_sg);
+	mqrq_cur->bounce_sg = NULL;
+
+	kfree(mqrq_cur->sg);
+	mqrq_cur->sg = NULL;
+
+	kfree(mqrq_cur->bounce_buf);
+	mqrq_cur->bounce_buf = NULL;
+
+	kfree(mqrq_prev->bounce_sg);
+	mqrq_prev->bounce_sg = NULL;
+
+	kfree(mqrq_prev->sg);
+	mqrq_prev->sg = NULL;
+
+	kfree(mqrq_prev->bounce_buf);
+	mqrq_prev->bounce_buf = 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);
+
+	BUG_ON(!mqrq->bounce_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);
+}