On Fri, Sep 18, 2009 at 10:00:53PM +0900, FUJITA Tomonori wrote:
> Let's confirm that dma_map_sg returns an invalid address.
>
> Eddie, can you try a kernel with the following patch and send kernel
> messages?
>
> Note that the patch doesn't fix the problem; just print debug
> information.
This is going to be quite noisy, and not give us all that much information.
Why not try this patch instead?
diff --git a/drivers/scsi/scsi_lib_dma.c b/drivers/scsi/scsi_lib_dma.c
index ac6855c..a179ff8 100644
--- a/drivers/scsi/scsi_lib_dma.c
+++ b/drivers/scsi/scsi_lib_dma.c
@@ -20,7 +20,8 @@
*/
int scsi_dma_map(struct scsi_cmnd *cmd)
{
- int nseg = 0;
+ int i, nseg = 0;
+ struct scatterlist *sgl;
if (scsi_sg_count(cmd)) {
struct device *dev = cmd->device->host->shost_gendev.parent;
@@ -29,6 +30,11 @@ int scsi_dma_map(struct scsi_cmnd *cmd)
cmd->sc_data_direction);
if (unlikely(!nseg))
return -ENOMEM;
+ scsi_for_each_sg(cmd, sgl, nseg, i) {
+ if (sg_dma_address(sgl) > *dev->dma_mask) {
+ printk("IOMMU bug, command %d, dma mask %llx, but returned %lx %u for phys %lx\n", cmd->cmnd[0], *dev->dma_mask, (unsigned long)sg_dma_address(sgl), sg_dma_len(sgl), (unsigned long)sg_phys(sgl));
+ }
+ }
}
return nseg;
}
> diff --git a/drivers/scsi/megaraid/megaraid_mbox.c b/drivers/scsi/megaraid/megaraid_mbox.c
> index 234f0b7..0d0a02f 100644
> --- a/drivers/scsi/megaraid/megaraid_mbox.c
> +++ b/drivers/scsi/megaraid/megaraid_mbox.c
> @@ -1391,7 +1391,12 @@ megaraid_mbox_mksgl(adapter_t *adapter, scb_t *scb)
>
> scb->dma_type = MRAID_DMA_WSG;
>
> + printk("%x %lx\n", scp->cmnd[0],
> + (unsigned long)*(scp->device->host->shost_gendev.parent->dma_mask));
> +
> scsi_for_each_sg(scp, sgl, sgcnt, i) {
> + printk("%lx %u\n", (unsigned long)sg_dma_address(sgl),
> + sg_dma_len(sgl));
> ccb->sgl64[i].address = sg_dma_address(sgl);
> ccb->sgl64[i].length = sg_dma_len(sgl);
> }
>
> --
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--
Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
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