On 18.01.2011 [12:31:52 +1100], Anton Blanchard wrote:
> Hi,
>
> I was testing 2.6.37-git17 on a POWER7 with virtual IO and hit this:
>
> Trying to unpack rootfs image as initramfs...
> Freeing initrd memory: 7446k freed
> vio 30000000: Warning: IOMMU dma not supported: mask
> 0xffffffffffffffff, table unavailable
> vio 4000: Warning: IOMMU dma not supported: mask 0xffffffffffffffff,
> table unavailable
> vio 4001: Warning: IOMMU dma not supported: mask 0xffffffffffffffff,
> table unavailable
> vio 4002: Warning: IOMMU dma not supported: mask 0xffffffffffffffff,
> table unavailable
> vio 4004: Warning: IOMMU dma not supported: mask 0xffffffffffffffff,
> table unavailable
> audit: initializing netlink socket (disabled)
>
> Haven't had a chance to look closer yet.
After debugging a bit, this would appear to be due to the second hunk of
b3c73856ae47d43d0d181f9de1c1c6c0820c4515.
diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c
index b265405..1b695fd 100644
--- a/arch/powerpc/kernel/vio.c
+++ b/arch/powerpc/kernel/vio.c
@@ -1257,6 +1257,10 @@ struct vio_dev *vio_register_device_node(struct
device_node *of_node)
viodev->dev.parent = &vio_bus_device.dev;
viodev->dev.bus = &vio_bus_type;
viodev->dev.release = vio_dev_release;
+ /* needed to ensure proper operation of coherent allocations
+ * later, in case driver doesn't set it explicitly */
+ dma_set_mask(&viodev->dev, DMA_BIT_MASK(64));
+ dma_set_coherent_mask(&viodev->dev, DMA_BIT_MASK(64));
/* register with generic device framework */
if (device_register(&viodev->dev)) {
Milton, Sonny, any thoughts?
Thanks,
Nish
--
Nishanth Aravamudan <n...@us.ibm.com>
IBM Linux Technology Center
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