linux-kernel - Re: [PATCH v2] PCI: endpoint: Use EPC's device in dma_alloc_coherent/dma_free

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Message-ID: <8af4c0ae-e132-e56c-7e07-bbe4b78265bd@ti.com>
Date:   Thu, 11 Jan 2018 14:01:57 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:     Bjorn Helgaas <bhelgaas@...gle.com>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <nsekhar@...com>,
        Robin Murphy <robin.murphy@....com>,
        Rob Herring <robh@...nel.org>, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2] PCI: endpoint: Use EPC's device in
 dma_alloc_coherent/dma_free_coherent



On Wednesday 10 January 2018 04:41 PM, Lorenzo Pieralisi wrote:
> On Tue, Dec 19, 2017 at 02:06:27PM +0530, Kishon Vijay Abraham I wrote:
>> After commit 723288836628bc1c08 ("of: restrict DMA configuration"),
>> of_dma_configure doesn't configure the coherent_dma_mask/dma_mask
>> of endpoint function device (since it doesn't have a dt node associated
>> with and hence no dma-ranges property), resulting in dma_alloc_coherent
>> (used in pci_epf_alloc_space) to fail.
>>
>> Fix it by making dma_alloc_coherent use EPC's device for allocating
>> memory address as per discussion in [1]
>>
>> [1] https://lkml.org/lkml/2017/10/24/26
> 
> Hi Kishon,
> 
> small nit, mind embedding the link [1] above in a lkml redirector
> format - as described in:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v4.15-rc7
> 
> put it in a Link: tag to be added below - I think that's important
> for the commit log to have.
> 
> Either send me the formatted link or send a v3 with it, I will merge
> then.

sure, sent you a v3.

Thanks
Kishon