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

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Message-ID: <e6410453-9ca3-4bdc-3c74-654333f2806f@arm.com>
Date:   Fri, 10 May 2019 16:03:37 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     laurentiu.tudor@....com, hch@....de, stern@...land.harvard.edu,
        gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        marex@...x.de
Cc:     leoyang.li@....com, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/3] prerequisites for device reserved local mem
 rework

Hi Laurentiu,

On 10/05/2019 15:56,  wrote:
> From: Laurentiu Tudor <laurentiu.tudor@....com>
> 
> 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(-)
>