linux-kernel - Re: [PATCH 1/5] PCI: endpoint: functions/pci-epf-test: Add DMA support to transfer data

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Date:   Wed, 26 Feb 2020 09:39:20 -0800
From:   Alan Mikhak <alan.mikhak@...ive.com>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     amurray@...goodpenguin.co.uk, arnd@...db.de,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        linux-pci <linux-pci@...r.kernel.org>, lorenzo.pieralisi@....com
Subject: Re: [PATCH 1/5] PCI: endpoint: functions/pci-epf-test: Add DMA
 support to transfer data

On Tue, Feb 25, 2020 at 9:27 PM Kishon Vijay Abraham I <kishon@...com> wrote:
>
> Hi Alan,
>
> On 26/02/20 2:41 am, Alan Mikhak wrote:
> > @@ -380,6 +572,7 @@ static void pci_epf_test_unbind(struct pci_epf *epf)
> >         int bar;
> >
> >         cancel_delayed_work(&epf_test->cmd_handler);
> > +       pci_epf_clean_dma_chan(epf_test);
> >         pci_epc_stop(epc);
> >         for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
> >                 epf_bar = &epf->bar[bar];
> > @@ -550,6 +743,12 @@ static int pci_epf_test_bind(struct pci_epf *epf)
> >                 }
> >         }
> >
> > +       epf_test->dma_supported = true;
> > +
> > +       ret = pci_epf_init_dma_chan(epf_test);
> > +       if (ret)
> > +               epf_test->dma_supported = false;
> > +
> >         if (linkup_notifier) {
> >                 epf->nb.notifier_call = pci_epf_test_notifier;
> >                 pci_epc_register_notifier(epc, &epf->nb);
> >
> > Hi Kishon,
> >
> > Looking forward to building and trying this patch series on
> > a platform I work on.
> >
> > Would you please point me to where I can find the patches
> > which add pci_epf_init_dma_chan() and pci_epf_clean_dma_chan()
> > to Linux PCI Endpoint Framework?
>
> I've added these functions in pci-epf-test itself instead of adding in
> the core files. I realized adding it in core files may not be helpful if
> the endpoint function decides to use more number of DMA channels etc.,

Thanks Kishon,

I now realize they are in [PATCH 1/5] of this series. May I suggest renaming
them to pci_epf_test_init_dma_chan() and pci_epf_test_cleanup_dma_chan()?
With just pci_epf in their name, I was looking for them in pci-epf-core.c.

Regards,
Alan

>
> Thanks
> Kishon