Re: [RFC PATCH 0/3] prerequisites for device reserved local mem rework

[Robin Murphy]

Hi Laurentiu,

On 10/05/2019 15:56,  wrote:
> From: Laurentiu Tudor <laurentiu.tudor@xxxxxxx>
>
> For HCs that have local memory, replace the current DMA API usage
> with a genalloc generic allocator to manage the mappings for these
> devices.
> This is in preparation for dropping the existing "coherent" dma
> mem declaration APIs. Current implementation was relying on a short
> circuit in the DMA API that in the end, was acting as an allocator
> for these type of devices.
>
> Only compiled tested, so any volunteers willing to test are most welcome.

Based on my diggings into this in the past, I would expect that you need 
to do something about hcd_alloc_coherent() as well.

Robin.

> Thank you!
>
> For context, see thread here: https://lkml.org/lkml/2019/4/22/357
>
> Laurentiu Tudor (3):
>    ohci-hcd: use genalloc for USB HCs with local memory
>    usb: host: ohci-sm501: init genalloc for local memory
>    usb: host: ohci-tmio: init genalloc for local memory
>
>   drivers/usb/host/ohci-hcd.c   | 21 +++++++++---
>   drivers/usb/host/ohci-sm501.c | 63 +++++++++++++++++++----------------
>   drivers/usb/host/ohci-tmio.c  | 23 ++++++++-----
>   drivers/usb/host/ohci.h       |  3 ++
>   4 files changed, 69 insertions(+), 41 deletions(-)