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| author | David Vrabel <david.vrabel@csr.com> | 2009-08-24 18:02:27 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-12-11 22:55:14 +0300 |
| commit | 294a39e7829dfd663e6c5c94cede0c6a0c13e37f (patch) | |
| tree | c9157a84b52aa64f29ce445e1e86a4f4523d8d39 /drivers/usb/host/whci/whcd.h | |
| parent | 4c1bd3d7a7d114dabd58f62f386ac4bfd268be1f (diff) | |
| download | linux-294a39e7829dfd663e6c5c94cede0c6a0c13e37f.tar.xz | |
USB: whci-hcd: support urbs with scatter-gather lists
Support urbs with scatter-gather lists by trying to fit sg list elements
into page lists in one or more qTDs. qTDs must end on a wMaxPacketSize
boundary so if this isn't possible the urb's sg list must be copied into
bounce buffers.
Signed-off-by: David Vrabel <david.vrabel@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/whci/whcd.h')
| -rw-r--r-- | drivers/usb/host/whci/whcd.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/usb/host/whci/whcd.h b/drivers/usb/host/whci/whcd.h index 24e94d983c5e..c80c7d93bc4a 100644 --- a/drivers/usb/host/whci/whcd.h +++ b/drivers/usb/host/whci/whcd.h @@ -84,6 +84,11 @@ struct whc { * @len: the length of data in the associated TD. * @ntds_remaining: number of TDs (starting from this one) in this transfer. * + * @bounce_buf: a bounce buffer if the std was from an urb with a sg + * list that could not be mapped to qTDs directly. + * @bounce_sg: the first scatterlist element bounce_buf is for. + * @bounce_offset: the offset into bounce_sg for the start of bounce_buf. + * * Queued URBs may require more TDs than are available in a qset so we * use a list of these "software TDs" (sTDs) to hold per-TD data. */ @@ -97,6 +102,10 @@ struct whc_std { int num_pointers; dma_addr_t dma_addr; struct whc_page_list_entry *pl_virt; + + void *bounce_buf; + struct scatterlist *bounce_sg; + unsigned bounce_offset; }; /** |