lguest: the block driver

Lguest block driver

A simple block driver for lguest.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andi Kleen <ak@suse.de>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 275 insertions, 0 deletions

diff --git a/drivers/block/lguest_blk.c b/drivers/block/lguest_blk.c
new file mode 100644
index 000000000000..1634c2dd25ec
--- /dev/null
+++ b/drivers/block/lguest_blk.c
@@ -0,0 +1,275 @@
+/* A simple block driver for lguest.
+ *
+ * Copyright 2006 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+//#define DEBUG
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/blkdev.h>
+#include <linux/interrupt.h>
+#include <linux/lguest_bus.h>
+
+static char next_block_index = 'a';
+
+struct blockdev
+{
+        spinlock_t lock;
+
+        /* The disk structure for the kernel. */
+        struct gendisk *disk;
+
+        /* The major number for this disk. */
+        int major;
+        int irq;
+
+        unsigned long phys_addr;
+        /* The mapped block page. */
+        struct lguest_block_page *lb_page;
+
+        /* We only have a single request outstanding at a time. */
+        struct lguest_dma dma;
+        struct request *req;
+};
+
+/* Jens gave me this nice helper to end all chunks of a request. */
+static void end_entire_request(struct request *req, int uptodate)
+{
+        if (end_that_request_first(req, uptodate, req->hard_nr_sectors))
+                BUG();
+        add_disk_randomness(req->rq_disk);
+        blkdev_dequeue_request(req);
+        end_that_request_last(req, uptodate);
+}
+
+static irqreturn_t lgb_irq(int irq, void *_bd)
+{
+        struct blockdev *bd = _bd;
+        unsigned long flags;
+
+        if (!bd->req) {
+                pr_debug("No work!\n");
+                return IRQ_NONE;
+        }
+
+        if (!bd->lb_page->result) {
+                pr_debug("No result!\n");
+                return IRQ_NONE;
+        }
+
+        spin_lock_irqsave(&bd->lock, flags);
+        end_entire_request(bd->req, bd->lb_page->result == 1);
+        bd->req = NULL;
+        bd->dma.used_len = 0;
+        blk_start_queue(bd->disk->queue);
+        spin_unlock_irqrestore(&bd->lock, flags);
+        return IRQ_HANDLED;
+}
+
+static unsigned int req_to_dma(struct request *req, struct lguest_dma *dma)
+{
+        unsigned int i = 0, idx, len = 0;
+        struct bio *bio;
+
+        rq_for_each_bio(bio, req) {
+                struct bio_vec *bvec;
+                bio_for_each_segment(bvec, bio, idx) {
+                        BUG_ON(i == LGUEST_MAX_DMA_SECTIONS);
+                        BUG_ON(!bvec->bv_len);
+                        dma->addr[i] = page_to_phys(bvec->bv_page)
+                                + bvec->bv_offset;
+                        dma->len[i] = bvec->bv_len;
+                        len += bvec->bv_len;
+                        i++;
+                }
+        }
+        if (i < LGUEST_MAX_DMA_SECTIONS)
+                dma->len[i] = 0;
+        return len;
+}
+
+static void empty_dma(struct lguest_dma *dma)
+{
+        dma->len[0] = 0;
+}
+
+static void setup_req(struct blockdev *bd,
+                      int type, struct request *req, struct lguest_dma *dma)
+{
+        bd->lb_page->type = type;
+        bd->lb_page->sector = req->sector;
+        bd->lb_page->result = 0;
+        bd->req = req;
+        bd->lb_page->bytes = req_to_dma(req, dma);
+}
+
+static void do_write(struct blockdev *bd, struct request *req)
+{
+        struct lguest_dma send;
+
+        pr_debug("lgb: WRITE sector %li\n", (long)req->sector);
+        setup_req(bd, 1, req, &send);
+
+        lguest_send_dma(bd->phys_addr, &send);
+}
+
+static void do_read(struct blockdev *bd, struct request *req)
+{
+        struct lguest_dma ping;
+
+        pr_debug("lgb: READ sector %li\n", (long)req->sector);
+        setup_req(bd, 0, req, &bd->dma);
+
+        empty_dma(&ping);
+        lguest_send_dma(bd->phys_addr, &ping);
+}
+
+static void do_lgb_request(request_queue_t *q)
+{
+        struct blockdev *bd;
+        struct request *req;
+
+again:
+        req = elv_next_request(q);
+        if (!req)
+                return;
+
+        bd = req->rq_disk->private_data;
+        /* Sometimes we get repeated requests after blk_stop_queue. */
+        if (bd->req)
+                return;
+
+        if (!blk_fs_request(req)) {
+                pr_debug("Got non-command 0x%08x\n", req->cmd_type);
+                req->errors++;
+                end_entire_request(req, 0);
+                goto again;
+        }
+
+        if (rq_data_dir(req) == WRITE)
+                do_write(bd, req);
+        else
+                do_read(bd, req);
+
+        /* Wait for interrupt to tell us it's done. */
+        blk_stop_queue(q);
+}
+
+static struct block_device_operations lguestblk_fops = {
+        .owner = THIS_MODULE,
+};
+
+static int lguestblk_probe(struct lguest_device *lgdev)
+{
+        struct blockdev *bd;
+        int err;
+        int irqflags = IRQF_SHARED;
+
+        bd = kmalloc(sizeof(*bd), GFP_KERNEL);
+        if (!bd)
+                return -ENOMEM;
+
+        spin_lock_init(&bd->lock);
+        bd->irq = lgdev_irq(lgdev);
+        bd->req = NULL;
+        bd->dma.used_len = 0;
+        bd->dma.len[0] = 0;
+        bd->phys_addr = (lguest_devices[lgdev->index].pfn << PAGE_SHIFT);
+
+        bd->lb_page = lguest_map(bd->phys_addr, 1);
+        if (!bd->lb_page) {
+                err = -ENOMEM;
+                goto out_free_bd;
+        }
+
+        bd->major = register_blkdev(0, "lguestblk");
+        if (bd->major < 0) {
+                err = bd->major;
+                goto out_unmap;
+        }
+
+        bd->disk = alloc_disk(1);
+        if (!bd->disk) {
+                err = -ENOMEM;
+                goto out_unregister_blkdev;
+        }
+
+        bd->disk->queue = blk_init_queue(do_lgb_request, &bd->lock);
+        if (!bd->disk->queue) {
+                err = -ENOMEM;
+                goto out_put_disk;
+        }
+
+        /* We can only handle a certain number of sg entries */
+        blk_queue_max_hw_segments(bd->disk->queue, LGUEST_MAX_DMA_SECTIONS);
+        /* Buffers must not cross page boundaries */
+        blk_queue_segment_boundary(bd->disk->queue, PAGE_SIZE-1);
+
+        sprintf(bd->disk->disk_name, "lgb%c", next_block_index++);
+        if (lguest_devices[lgdev->index].features & LGUEST_DEVICE_F_RANDOMNESS)
+                irqflags |= IRQF_SAMPLE_RANDOM;
+        err = request_irq(bd->irq, lgb_irq, irqflags, bd->disk->disk_name, bd);
+        if (err)
+                goto out_cleanup_queue;
+
+        err = lguest_bind_dma(bd->phys_addr, &bd->dma, 1, bd->irq);
+        if (err)
+                goto out_free_irq;
+
+        bd->disk->major = bd->major;
+        bd->disk->first_minor = 0;
+        bd->disk->private_data = bd;
+        bd->disk->fops = &lguestblk_fops;
+        /* This is initialized to the disk size by the other end. */
+        set_capacity(bd->disk, bd->lb_page->num_sectors);
+        add_disk(bd->disk);
+
+        printk(KERN_INFO "%s: device %i at major %d\n",
+               bd->disk->disk_name, lgdev->index, bd->major);
+
+        lgdev->private = bd;
+        return 0;
+
+out_free_irq:
+        free_irq(bd->irq, bd);
+out_cleanup_queue:
+        blk_cleanup_queue(bd->disk->queue);
+out_put_disk:
+        put_disk(bd->disk);
+out_unregister_blkdev:
+        unregister_blkdev(bd->major, "lguestblk");
+out_unmap:
+        lguest_unmap(bd->lb_page);
+out_free_bd:
+        kfree(bd);
+        return err;
+}
+
+static struct lguest_driver lguestblk_drv = {
+        .name = "lguestblk",
+        .owner = THIS_MODULE,
+        .device_type = LGUEST_DEVICE_T_BLOCK,
+        .probe = lguestblk_probe,
+};
+
+static __init int lguestblk_init(void)
+{
+        return register_lguest_driver(&lguestblk_drv);
+}
+module_init(lguestblk_init);
+
+MODULE_DESCRIPTION("Lguest block driver");
+MODULE_LICENSE("GPL");