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SubjectRe: [PATCH 4/5] lguest block driver feedback tidyups
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On Fri, 2007-05-11 at 11:23 +1000, Rusty Russell wrote:
> 1) Use new dma wrapper functions, and handle bind failure (may happen
> in future)
> 2) Use new lgdev_irq() "get me a good interrupt number" function.
> 3) __force the ioremap: guests can use it as normal memory.

And here is the update using lguest_map/unmap instead of ioremap +
__force:

1) Use new dma wrapper functions, and handle bind failure (may happen
in future)
2) Use new lgdev_irq() "get me a good interrupt number" function.
3) Use new lguest_map()/lguest_unmap() instead of ioremap/iounmap.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
drivers/block/lguest_blk.c | 18 +++++++++++-------
1 file changed, 11 insertions(+), 7 deletions(-)
===================================================================
--- a/drivers/block/lguest_blk.c
+++ b/drivers/block/lguest_blk.c
@@ -37,7 +37,7 @@ struct blockdev
int irq;

unsigned long phys_addr;
- /* The ioremap'ed block page. */
+ /* The mapped block page. */
struct lguest_block_page *lb_page;

/* We only have a single request outstanding at a time. */
@@ -123,7 +123,7 @@ static void do_write(struct blockdev *bd
pr_debug("lgb: WRITE sector %li\n", (long)req->sector);
setup_req(bd, 1, req, &send);

- hcall(LHCALL_SEND_DMA, bd->phys_addr, __pa(&send), 0);
+ lguest_send_dma(bd->phys_addr, &send);
}

static void do_read(struct blockdev *bd, struct request *req)
@@ -134,7 +134,7 @@ static void do_read(struct blockdev *bd,
setup_req(bd, 0, req, &bd->dma);

empty_dma(&ping);
- hcall(LHCALL_SEND_DMA, bd->phys_addr, __pa(&ping), 0);
+ lguest_send_dma(bd->phys_addr, &ping);
}

static void do_lgb_request(request_queue_t *q)
@@ -183,13 +183,13 @@ static int lguestblk_probe(struct lguest
return -ENOMEM;

spin_lock_init(&bd->lock);
- bd->irq = lgdev->index+1;
+ 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 = (void *)ioremap(bd->phys_addr, PAGE_SIZE);
+ bd->lb_page = lguest_map(bd->phys_addr, 1);
if (!bd->lb_page) {
err = -ENOMEM;
goto out_free_bd;
@@ -225,7 +225,9 @@ static int lguestblk_probe(struct lguest
if (err)
goto out_cleanup_queue;

- hcall(LHCALL_BIND_DMA, bd->phys_addr, __pa(&bd->dma), (1<<8)+bd->irq);
+ 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;
@@ -241,6 +243,8 @@ static int lguestblk_probe(struct lguest
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:
@@ -248,7 +252,7 @@ out_unregister_blkdev:
out_unregister_blkdev:
unregister_blkdev(bd->major, "lguestblk");
out_unmap:
- iounmap(bd->lb_page);
+ lguest_unmap(bd->lb_page);
out_free_bd:
kfree(bd);
return err;

-
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