This uses the BAM dmaengine driver for the ipa2_lite driver. It gives working mobile data in simple cases (accessing wikipedia works), but crashes when accessing youtube.
The crash when using youtube is caused by a NULL pointer in ipa_poll_tx, using netconsole I could observe
BUG_ON(!skb) being triggered.
while (done < budget) {
struct ipa_trans *trans;
done++;
trans = bam_channel_poll_one_new(ep);
if (!trans)
break;
skb = trans->skb;
BUG_ON(!skb);
bytes += skb->len;
packets++;
dma_unmap_single(dev, trans->addr, skb->len, DMA_TO_DEVICE);
dev_consume_skb_any(skb);
ipa_trans_free(trans);
}
Another issue is that I had to remove the iommus from the ipa and ipa_bam nodes to make BAM dma work.
spasswolf
commented
5 months ago
This uses the BAM dmaengine driver for the ipa2_lite driver. It gives working mobile data in simple cases (accessing wikipedia works), but crashes when accessing youtube.
The crash when using youtube is caused by a NULL pointer in ipa_poll_tx, using netconsole I could observe BUG_ON(!skb) being triggered.
Another issue is that I had to remove the iommus from the ipa and ipa_bam nodes to make BAM dma work.