projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * linux/drivers/mmc/mmc_queue.c | |
| 3 | * | |
| 4 | * Copyright (C) 2003 Russell King, All Rights Reserved. | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | * | |
| 10 | */ | |
| 11 | #include <linux/module.h> | |
| 12 | #include <linux/blkdev.h> | |
| 13 | ||
| 14 | #include <linux/mmc/card.h> | |
| 15 | #include <linux/mmc/host.h> | |
| 16 | #include "mmc_queue.h" | |
| 17 | ||
| 18 | #define MMC_QUEUE_EXIT (1 << 0) | |
| 19 | #define MMC_QUEUE_SUSPENDED (1 << 1) | |
| 20 | ||
| 21 | /* | |
| 22 | * Prepare a MMC request. Essentially, this means passing the | |
| 23 | * preparation off to the media driver. The media driver will | |
| 24 | * create a mmc_io_request in req->special. | |
| 25 | */ | |
| 26 | static int mmc_prep_request(struct request_queue *q, struct request *req) | |
| 27 | { | |
| 28 | struct mmc_queue *mq = q->queuedata; | |
| 29 | int ret = BLKPREP_KILL; | |
| 30 | ||
| 31 | if (req->flags & REQ_SPECIAL) { | |
| 32 | /* | |
| 33 | * Special commands already have the command | |
| 34 | * blocks already setup in req->special. | |
| 35 | */ | |
| 36 | BUG_ON(!req->special); | |
| 37 | ||
| 38 | ret = BLKPREP_OK; | |
| 39 | } else if (req->flags & (REQ_CMD | REQ_BLOCK_PC)) { | |
| 40 | /* | |
| 41 | * Block I/O requests need translating according | |
| 42 | * to the protocol. | |
| 43 | */ | |
| 44 | ret = mq->prep_fn(mq, req); | |
| 45 | } else { | |
| 46 | /* | |
| 47 | * Everything else is invalid. | |
| 48 | */ | |
| 49 | blk_dump_rq_flags(req, "MMC bad request"); | |
| 50 | } | |
| 51 | ||
| 52 | if (ret == BLKPREP_OK) | |
| 53 | req->flags |= REQ_DONTPREP; | |
| 54 | ||
| 55 | return ret; | |
| 56 | } | |
| 57 | ||
| 58 | static int mmc_queue_thread(void *d) | |
| 59 | { | |
| 60 | struct mmc_queue *mq = d; | |
| 61 | struct request_queue *q = mq->queue; | |
| 62 | DECLARE_WAITQUEUE(wait, current); | |
| 63 | ||
| 64 | /* | |
| 65 | * Set iothread to ensure that we aren't put to sleep by | |
| 66 | * the process freezing. We handle suspension ourselves. | |
| 67 | */ | |
| 68 | current->flags |= PF_MEMALLOC|PF_NOFREEZE; | |
| 69 | ||
| 70 | daemonize("mmcqd"); | |
| 71 | ||
| 72 | complete(&mq->thread_complete); | |
| 73 | ||
| 74 | down(&mq->thread_sem); | |
| 75 | add_wait_queue(&mq->thread_wq, &wait); | |
| 76 | do { | |
| 77 | struct request *req = NULL; | |
| 78 | ||
| 79 | spin_lock_irq(q->queue_lock); | |
| 80 | set_current_state(TASK_INTERRUPTIBLE); | |
| 81 | if (!blk_queue_plugged(q)) |