lkml.org 
[lkml]   [2011]   [Feb]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
SubjectRe: b44 driver causes panic when using swiotlb
From
On Mon, 31 Jan 2011 10:54:12 -0500
Chuck Ebbert <cebbert@redhat.com> wrote:

> The b44 driver is triggering this panic in swiotlb_map_page():
>
> if (!dma_capable(dev, dev_addr, size))
> panic("map_single: bounce buffer is not DMA'ble");
>
> The kernel log says the bounce buffers are at 0xdb400000, but b44 can
> only do DMA to the first 1GB of memory:

Can you try this? b44 has the own bouncing mechanism so if swiotlb
returns an error, the driver can allocate an appropriate buffer.

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index c47bbe1..93ca08b 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -686,8 +686,10 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
/*
* Ensure that the address returned is DMA'ble
*/
- if (!dma_capable(dev, dev_addr, size))
- panic("map_single: bounce buffer is not DMA'ble");
+ if (!dma_capable(dev, dev_addr, size)) {
+ swiotlb_tbl_unmap_single(dev, map, size, dir);
+ dev_addr = swiotlb_virt_to_bus(dev, io_tlb_overflow_buffer);
+ }

return dev_addr;
}

\
 
 \ /
  Last update: 2011-02-01 15:15    [W:0.130 / U:0.004 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site