#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/slab.h>
-#include <linux/vmalloc.h>
#include <linux/mtd/ubi.h>
#include <linux/workqueue.h>
#include <linux/blkdev.h>
+#include <linux/blk-mq.h>
#include <linux/hdreg.h>
+#include <linux/scatterlist.h>
#include <asm/div64.h>
#include "ubi-media.h"
char name[UBIBLOCK_PARAM_LEN+1];
};
+struct ubiblock_pdu {
+ struct work_struct work;
+ struct ubi_sgl usgl;
+};
+
/* Numbers of elements set in the @ubiblock_param array */
static int ubiblock_devs __initdata;
struct request_queue *rq;
struct workqueue_struct *wq;
- struct work_struct work;
struct mutex dev_mutex;
- spinlock_t queue_lock;
struct list_head list;
+ struct blk_mq_tag_set tag_set;
};
/* Linked list of all ubiblock instances */
return NULL;
}
-static int ubiblock_read_to_buf(struct ubiblock *dev, char *buffer,
- int leb, int offset, int len)
+static int ubiblock_read(struct ubiblock_pdu *pdu)
{
- int ret;
-
- ret = ubi_read(dev->desc, leb, buffer, offset, len);
- if (ret) {
- dev_err(disk_to_dev(dev->gd), "%d while reading from LEB %d (offset %d, length %d)",
- ret, leb, offset, len);
- return ret;
- }
- return 0;
-}
+ int ret, leb, offset, bytes_left, to_read;
+ u64 pos;
+ struct request *req = blk_mq_rq_from_pdu(pdu);
+ struct ubiblock *dev = req->q->queuedata;
-static int ubiblock_read(struct ubiblock *dev, char *buffer,
- sector_t sec, int len)
-{
- int ret, leb, offset;
- int bytes_left = len;
- int to_read = len;
- u64 pos = sec << 9;
+ to_read = blk_rq_bytes(req);
+ pos = blk_rq_pos(req) << 9;
/* Get LEB:offset address to read from */
offset = do_div(pos, dev->leb_size);
leb = pos;
+ bytes_left = to_read;
while (bytes_left) {
/*
if (offset + to_read > dev->leb_size)
to_read = dev->leb_size - offset;
- ret = ubiblock_read_to_buf(dev, buffer, leb, offset, to_read);
- if (ret)
+ ret = ubi_read_sg(dev->desc, leb, &pdu->usgl, offset, to_read);
+ if (ret < 0)
return ret;
- buffer += to_read;
bytes_left -= to_read;
to_read = bytes_left;
leb += 1;
return 0;
}
-static int do_ubiblock_request(struct ubiblock *dev, struct request *req)
-{
- int len, ret;
- sector_t sec;
-
- if (req->cmd_type != REQ_TYPE_FS)
- return -EIO;
-
- if (blk_rq_pos(req) + blk_rq_cur_sectors(req) >
- get_capacity(req->rq_disk))
- return -EIO;
-
- if (rq_data_dir(req) != READ)
- return -ENOSYS; /* Write not implemented */
-
- sec = blk_rq_pos(req);
- len = blk_rq_cur_bytes(req);
-
- /*
- * Let's prevent the device from being removed while we're doing I/O
- * work. Notice that this means we serialize all the I/O operations,
- * but it's probably of no impact given the NAND core serializes
- * flash access anyway.
- */
- mutex_lock(&dev->dev_mutex);
- ret = ubiblock_read(dev, bio_data(req->bio), sec, len);
- mutex_unlock(&dev->dev_mutex);
-
- return ret;
-}
-
-static void ubiblock_do_work(struct work_struct *work)
-{
- struct ubiblock *dev =
- container_of(work, struct ubiblock, work);
- struct request_queue *rq = dev->rq;
- struct request *req;
- int res;
-
- spin_lock_irq(rq->queue_lock);
-
- req = blk_fetch_request(rq);
- while (req) {
-
- spin_unlock_irq(rq->queue_lock);
- res = do_ubiblock_request(dev, req);
- spin_lock_irq(rq->queue_lock);
-
- /*
- * If we're done with this request,
- * we need to fetch a new one
- */
- if (!__blk_end_request_cur(req, res))
- req = blk_fetch_request(rq);
- }
-
- spin_unlock_irq(rq->queue_lock);
-}
-
-static void ubiblock_request(struct request_queue *rq)
-{
- struct ubiblock *dev;
- struct request *req;
-
- dev = rq->queuedata;
-
- if (!dev)
- while ((req = blk_fetch_request(rq)) != NULL)
- __blk_end_request_all(req, -ENODEV);
- else
- queue_work(dev->wq, &dev->work);
-}
-
static int ubiblock_open(struct block_device *bdev, fmode_t mode)
{
struct ubiblock *dev = bdev->bd_disk->private_data;
.getgeo = ubiblock_getgeo,
};
+static void ubiblock_do_work(struct work_struct *work)
+{
+ int ret;
+ struct ubiblock_pdu *pdu = container_of(work, struct ubiblock_pdu, work);
+ struct request *req = blk_mq_rq_from_pdu(pdu);
+
+ blk_mq_start_request(req);
+
+ /*
+ * It is safe to ignore the return value of blk_rq_map_sg() because
+ * the number of sg entries is limited to UBI_MAX_SG_COUNT
+ * and ubi_read_sg() will check that limit.
+ */
+ blk_rq_map_sg(req->q, req, pdu->usgl.sg);
+
+ ret = ubiblock_read(pdu);
+ blk_mq_end_request(req, ret);
+}
+
+static int ubiblock_queue_rq(struct blk_mq_hw_ctx *hctx,
+ const struct blk_mq_queue_data *bd)
+{
+ struct request *req = bd->rq;
+ struct ubiblock *dev = hctx->queue->queuedata;
+ struct ubiblock_pdu *pdu = blk_mq_rq_to_pdu(req);
+
+ if (req->cmd_type != REQ_TYPE_FS)
+ return BLK_MQ_RQ_QUEUE_ERROR;
+
+ if (rq_data_dir(req) != READ)
+ return BLK_MQ_RQ_QUEUE_ERROR; /* Write not implemented */
+
+ ubi_sgl_init(&pdu->usgl);
+ queue_work(dev->wq, &pdu->work);
+
+ return BLK_MQ_RQ_QUEUE_OK;
+}
+
+static int ubiblock_init_request(void *data, struct request *req,
+ unsigned int hctx_idx,
+ unsigned int request_idx,
+ unsigned int numa_node)
+{
+ struct ubiblock_pdu *pdu = blk_mq_rq_to_pdu(req);
+
+ sg_init_table(pdu->usgl.sg, UBI_MAX_SG_COUNT);
+ INIT_WORK(&pdu->work, ubiblock_do_work);
+
+ return 0;
+}
+
+static struct blk_mq_ops ubiblock_mq_ops = {
+ .queue_rq = ubiblock_queue_rq,
+ .init_request = ubiblock_init_request,
+ .map_queue = blk_mq_map_queue,
+};
+
int ubiblock_create(struct ubi_volume_info *vi)
{
struct ubiblock *dev;
set_capacity(gd, disk_capacity);
dev->gd = gd;
- spin_lock_init(&dev->queue_lock);
- dev->rq = blk_init_queue(ubiblock_request, &dev->queue_lock);
- if (!dev->rq) {
- dev_err(disk_to_dev(gd), "blk_init_queue failed");
- ret = -ENODEV;
+ dev->tag_set.ops = &ubiblock_mq_ops;
+ dev->tag_set.queue_depth = 64;
+ dev->tag_set.numa_node = NUMA_NO_NODE;
+ dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
+ dev->tag_set.cmd_size = sizeof(struct ubiblock_pdu);
+ dev->tag_set.driver_data = dev;
+ dev->tag_set.nr_hw_queues = 1;
+
+ ret = blk_mq_alloc_tag_set(&dev->tag_set);
+ if (ret) {
+ dev_err(disk_to_dev(dev->gd), "blk_mq_alloc_tag_set failed");
goto out_put_disk;
}
+ dev->rq = blk_mq_init_queue(&dev->tag_set);
+ if (IS_ERR(dev->rq)) {
+ dev_err(disk_to_dev(gd), "blk_mq_init_queue failed");
+ ret = PTR_ERR(dev->rq);
+ goto out_free_tags;
+ }
+ blk_queue_max_segments(dev->rq, UBI_MAX_SG_COUNT);
+
dev->rq->queuedata = dev;
dev->gd->queue = dev->rq;
ret = -ENOMEM;
goto out_free_queue;
}
- INIT_WORK(&dev->work, ubiblock_do_work);
mutex_lock(&devices_mutex);
list_add_tail(&dev->list, &ubiblock_devices);
out_free_queue:
blk_cleanup_queue(dev->rq);
+out_free_tags:
+ blk_mq_free_tag_set(&dev->tag_set);
out_put_disk:
put_disk(dev->gd);
out_free_dev:
static void ubiblock_cleanup(struct ubiblock *dev)
{
+ /* Stop new requests to arrive */
del_gendisk(dev->gd);
+ /* Flush pending work */
+ destroy_workqueue(dev->wq);
+ /* Finally destroy the blk queue */
blk_cleanup_queue(dev->rq);
+ blk_mq_free_tag_set(&dev->tag_set);
dev_info(disk_to_dev(dev->gd), "released");
put_disk(dev->gd);
}
list_del(&dev->list);
mutex_unlock(&devices_mutex);
- /* Flush pending work and stop this workqueue */
- destroy_workqueue(dev->wq);
-
ubiblock_cleanup(dev);
mutex_unlock(&dev->dev_mutex);
kfree(dev);
return ubi_open_volume(ubi_num, vol_id, UBI_READONLY);
}
-static int __init ubiblock_create_from_param(void)
+static void __init ubiblock_create_from_param(void)
{
- int i, ret;
+ int i, ret = 0;
struct ubiblock_param *p;
struct ubi_volume_desc *desc;
struct ubi_volume_info vi;
+ /*
+ * If there is an error creating one of the ubiblocks, continue on to
+ * create the following ubiblocks. This helps in a circumstance where
+ * the kernel command-line specifies multiple block devices and some
+ * may be broken, but we still want the working ones to come up.
+ */
for (i = 0; i < ubiblock_devs; i++) {
p = &ubiblock_param[i];
desc = open_volume_desc(p->name, p->ubi_num, p->vol_id);
if (IS_ERR(desc)) {
- pr_err("UBI: block: can't open volume, err=%ld\n",
- PTR_ERR(desc));
- ret = PTR_ERR(desc);
- break;
+ pr_err(
+ "UBI: block: can't open volume on ubi%d_%d, err=%ld",
+ p->ubi_num, p->vol_id, PTR_ERR(desc));
+ continue;
}
ubi_get_volume_info(desc, &vi);
ret = ubiblock_create(&vi);
if (ret) {
- pr_err("UBI: block: can't add '%s' volume, err=%d\n",
- vi.name, ret);
- break;
+ pr_err(
+ "UBI: block: can't add '%s' volume on ubi%d_%d, err=%d",
+ vi.name, p->ubi_num, p->vol_id, ret);
+ continue;
}
}
- return ret;
}
static void ubiblock_remove_all(void)
struct ubiblock *dev;
list_for_each_entry_safe(dev, next, &ubiblock_devices, list) {
- /* Flush pending work and stop workqueue */
- destroy_workqueue(dev->wq);
/* The module is being forcefully removed */
WARN_ON(dev->desc);
/* Remove from device list */
if (ubiblock_major < 0)
return ubiblock_major;
- /* Attach block devices from 'block=' module param */
- ret = ubiblock_create_from_param();
- if (ret)
- goto err_remove;
+ /*
+ * Attach block devices from 'block=' module param.
+ * Even if one block device in the param list fails to come up,
+ * still allow the module to load and leave any others up.
+ */
+ ubiblock_create_from_param();
/*
* Block devices are only created upon user requests, so we ignore
err_unreg:
unregister_blkdev(ubiblock_major, "ubiblock");
-err_remove:
ubiblock_remove_all();
return ret;
}
projects / cascardo / linux.git / blobdiff