diff options
Diffstat (limited to 'drivers/mmc/mmc_queue.c')
| -rw-r--r-- | drivers/mmc/mmc_queue.c | 239 |
1 files changed, 0 insertions, 239 deletions
diff --git a/drivers/mmc/mmc_queue.c b/drivers/mmc/mmc_queue.c deleted file mode 100644 index 74f8cdeeff0..00000000000 --- a/drivers/mmc/mmc_queue.c +++ /dev/null @@ -1,239 +0,0 @@ -/* - * linux/drivers/mmc/mmc_queue.c - * - * Copyright (C) 2003 Russell King, All Rights Reserved. - * - * 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/module.h> -#include <linux/blkdev.h> - -#include <linux/mmc/card.h> -#include <linux/mmc/host.h> -#include "mmc_queue.h" - -#define MMC_QUEUE_EXIT (1 << 0) -#define MMC_QUEUE_SUSPENDED (1 << 1) - -/* - * Prepare a MMC request. Essentially, this means passing the - * preparation off to the media driver. The media driver will - * create a mmc_io_request in req->special. - */ -static int mmc_prep_request(struct request_queue *q, struct request *req) -{ - struct mmc_queue *mq = q->queuedata; - int ret = BLKPREP_KILL; - - if (req->flags & REQ_SPECIAL) { - /* - * Special commands already have the command - * blocks already setup in req->special. - */ - BUG_ON(!req->special); - - ret = BLKPREP_OK; - } else if (req->flags & (REQ_CMD | REQ_BLOCK_PC)) { - /* - * Block I/O requests need translating according - * to the protocol. - */ - ret = mq->prep_fn(mq, req); - } else { - /* - * Everything else is invalid. - */ - blk_dump_rq_flags(req, "MMC bad request"); - } - - if (ret == BLKPREP_OK) - req->flags |= REQ_DONTPREP; - - return ret; -} - -static int mmc_queue_thread(void *d) -{ - struct mmc_queue *mq = d; - struct request_queue *q = mq->queue; - DECLARE_WAITQUEUE(wait, current); - - /* - * Set iothread to ensure that we aren't put to sleep by - * the process freezing. We handle suspension ourselves. - */ - current->flags |= PF_MEMALLOC|PF_NOFREEZE; - - daemonize("mmcqd"); - - complete(&mq->thread_complete); - - down(&mq->thread_sem); - add_wait_queue(&mq->thread_wq, &wait); - do { - struct request *req = NULL; - - spin_lock_irq(q->queue_lock); - set_current_state(TASK_INTERRUPTIBLE); - if (!blk_queue_plugged(q)) - req = elv_next_request(q); - mq->req = req; - spin_unlock_irq(q->queue_lock); - - if (!req) { - if (mq->flags & MMC_QUEUE_EXIT) - break; - up(&mq->thread_sem); - schedule(); - down(&mq->thread_sem); - continue; - } - set_current_state(TASK_RUNNING); - - mq->issue_fn(mq, req); - } while (1); - remove_wait_queue(&mq->thread_wq, &wait); - up(&mq->thread_sem); - - complete_and_exit(&mq->thread_complete, 0); - 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(request_queue_t *q) -{ - struct mmc_queue *mq = q->queuedata; - - if (!mq->req) - wake_up(&mq->thread_wq); -} - -/** - * mmc_init_queue - initialise a queue structure. - * @mq: mmc queue - * @card: mmc card to attach this queue - * @lock: queue lock - * - * Initialise a MMC card request queue. - */ -int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock) -{ - struct mmc_host *host = card->host; - u64 limit = BLK_BOUNCE_HIGH; - int ret; - - if (host->dev->dma_mask && *host->dev->dma_mask) - limit = *host->dev->dma_mask; - - mq->card = card; - mq->queue = blk_init_queue(mmc_request, lock); - if (!mq->queue) - return -ENOMEM; - - blk_queue_prep_rq(mq->queue, mmc_prep_request); - blk_queue_bounce_limit(mq->queue, limit); - blk_queue_max_sectors(mq->queue, host->max_sectors); - blk_queue_max_phys_segments(mq->queue, host->max_phys_segs); - blk_queue_max_hw_segments(mq->queue, host->max_hw_segs); - blk_queue_max_segment_size(mq->queue, host->max_seg_size); - - mq->queue->queuedata = mq; - mq->req = NULL; - - mq->sg = kmalloc(sizeof(struct scatterlist) * host->max_phys_segs, - GFP_KERNEL); - if (!mq->sg) { - ret = -ENOMEM; - goto cleanup; - } - - init_completion(&mq->thread_complete); - init_waitqueue_head(&mq->thread_wq); - init_MUTEX(&mq->thread_sem); - - ret = kernel_thread(mmc_queue_thread, mq, CLONE_KERNEL); - if (ret >= 0) { - wait_for_completion(&mq->thread_complete); - init_completion(&mq->thread_complete); - ret = 0; - goto out; - } - - cleanup: - kfree(mq->sg); - mq->sg = NULL; - - blk_cleanup_queue(mq->queue); - out: - return ret; -} -EXPORT_SYMBOL(mmc_init_queue); - -void mmc_cleanup_queue(struct mmc_queue *mq) -{ - mq->flags |= MMC_QUEUE_EXIT; - wake_up(&mq->thread_wq); - wait_for_completion(&mq->thread_complete); - - kfree(mq->sg); - mq->sg = NULL; - - blk_cleanup_queue(mq->queue); - - 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) -{ - request_queue_t *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); - } -} -EXPORT_SYMBOL(mmc_queue_suspend); - -/** - * mmc_queue_resume - resume a previously suspended MMC request queue - * @mq: MMC queue to resume - */ -void mmc_queue_resume(struct mmc_queue *mq) -{ - request_queue_t *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); - } -} -EXPORT_SYMBOL(mmc_queue_resume); |