[BUG] XHCI getting ZONE_DMA32 memory > than its bus_dma_limit
Jeremy Linton
jeremy.linton at arm.com
Thu Jul 2 13:49:14 EDT 2020
Hi,
Using 5.8rc3:
The rpi4 has a 3G dev->bus_dma_limit on its XHCI controller. With a usb3
hub, plus a few devices plugged in, randomly devices will fail
operations. This appears to because xhci_alloc_container_ctx() is
getting buffers > 3G via dma_pool_zalloc().
Tracking that down, it seems to be caused by dma_alloc_from_pool() using
dev_to_pool()->dma_direct_optimal_gfp_mask() to "optimistically" select
the atomic_pool_dma32 but then failing to verify that the allocations in
the pool are less than the dev bus_dma_limit.
Thanks,
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