On Mon, Apr 01, 2013 at 10:49:26AM +0800, Peter Chen wrote:
> On Fri, Mar 29, 2013 at 12:32:00AM +0100, Michael Grzeschik wrote:
[snip]
> What's the value of sizeof(struct ci13xxx_qh) after you pack it
> as 64 bytes aligned?
>
With the struct attribute aligned(64) the result
of sizeof(struct ci13xxx_qh) is 64 bytes.
> QH is 48-bytes structure, but needs 64-bytes aligned, it can't
> avoid wasting 16 bytes.
Correct.
> So, please make sure the memory layout is correct for qh arrays.
I tested the code, it did not work without the aligned attribute.
> > /* alloc resources */
> > - ci->qh_pool = dma_pool_create("ci13xxx_qh", dev,
> > - sizeof(struct ci13xxx_qh),
> > - 64, CI13XXX_PAGE_SIZE);
> > - if (ci->qh_pool == NULL)
> > + ci->qh.ptr = dma_alloc_coherent(dev, ci->qh.size,
> > + &ci->qh.dma, GFP_ATOMIC);
> > +
>
> GFP_ATMOIC isn't needed.
Correct, will fix.
>
> > + if (ci->qh.ptr == NULL)
> > return -ENOMEM;
> >
> > ci->td_pool = dma_pool_create("ci13xxx_td", dev,
> > @@ -1814,7 +1814,6 @@ destroy_eps:
> > free_pools:
> > dma_pool_destroy(ci->td_pool);
> > free_qh_pool:
> > - dma_pool_destroy(ci->qh_pool);
>
> You may need dma_free_coherent.
Will add that here.
>
> > return retval;
> > }
> >
> > @@ -1836,7 +1835,6 @@ static void udc_stop(struct ci13xxx *ci)
> > destroy_eps(ci);
> >
> > dma_pool_destroy(ci->td_pool);
> > - dma_pool_destroy(ci->qh_pool);
> >
> > if (!IS_ERR_OR_NULL(ci->transceiver)) {
> > otg_set_peripheral(ci->transceiver->otg, NULL);
> > diff --git a/drivers/usb/chipidea/udc.h b/drivers/usb/chipidea/udc.h
> > index 4b1315a..b7d3882 100644
> > --- a/drivers/usb/chipidea/udc.h
> > +++ b/drivers/usb/chipidea/udc.h
> > @@ -55,7 +55,7 @@ struct ci13xxx_qh {
> > /* 9 */
> > u32 RESERVED;
> > struct usb_ctrlrequest setup;
> > -} __attribute__ ((packed, aligned(4)));
> > +} __attribute__ ((packed, aligned(64)));
> >
> > /**
> > * struct ci13xxx_req - usb request representation
> > --
> > 1.8.2.rc2
Thanks for the review,
Michael
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