linux-kernel - Re: [PATCH v2 2/2] PCI: starfive: Simplify event doorbell bitmap initialization in pcie-starfive

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Message-ID: <CANAwSgQObUP-Jxk4o5KokA=U4RsNz5uoqvyfU-Tcmj=YNM=pYQ@mail.gmail.com>
Date: Mon, 17 Mar 2025 08:56:38 +0530
From: Anand Moon <linux.amoon@...il.com>
To: Minda Chen <minda.chen@...rfivetech.com>
Cc: Daire McNamara <daire.mcnamara@...rochip.com>, Lorenzo Pieralisi <lpieralisi@...nel.org>, 
	Krzysztof Wilczyński <kw@...ux.com>, 
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, Rob Herring <robh@...nel.org>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Kevin Xie <kevin.xie@...rfivetech.com>, 
	Conor Dooley <conor.dooley@...rochip.com>, Mason Huo <mason.huo@...rfivetech.com>, 
	"open list:PCI DRIVER FOR PLDA PCIE IP" <linux-pci@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] PCI: starfive: Simplify event doorbell bitmap
 initialization in pcie-starfive

Hi Minda

On Mon, 17 Mar 2025 at 07:53, Minda Chen <minda.chen@...rfivetech.com> wrote:
>
>
>
> >
> > The events_bitmap initialization in starfive_pcie_probe() previously masked out
> > the PLDA_AXI_DOORBELL and PLDA_PCIE_DOORBELL events.
> >
> > These masking has been removed, allowing these events to be included in the
> > bitmap. With this change ensures that all interrupt events are properly
> > accounted for and may be necessary for handling doorbell events in certain use
> > cases.
> >
> > PCIe Doorbell Events: These are typically used to notify a device about an event
> > or to trigger an action. For example, a host system can write to a doorbell
> > register on a PCIe device to signal that new data is available or that an
> > operation should start12.
> >
> > AXI-PCIe Bridge: This bridge acts as a protocol converter between AXI
> > (Advanced eXtensible Interface) and PCIe (Peripheral Component Interconnect
> > Express) domains. It allows transactions to be converted and communicated
> > between these two different protocols3.
> >
> > Fixes: 39b91eb40c6a ("PCI: starfive: Add JH7110 PCIe controller")
> > Cc: Minda Chen <minda.chen@...rfivetech.com>
> > Signed-off-by: Anand Moon <linux.amoon@...il.com>
> > ---
> > v2: new patch
> > ---
> >  drivers/pci/controller/plda/pcie-starfive.c | 4 +---
> >  1 file changed, 1 insertion(+), 3 deletions(-)
> >
> > diff --git a/drivers/pci/controller/plda/pcie-starfive.c
> > b/drivers/pci/controller/plda/pcie-starfive.c
> > index e73c1b7bc8efc..d2c2a8e039e10 100644
> > --- a/drivers/pci/controller/plda/pcie-starfive.c
> > +++ b/drivers/pci/controller/plda/pcie-starfive.c
> > @@ -410,9 +410,7 @@ static int starfive_pcie_probe(struct platform_device
> > *pdev)
> >       plda->host_ops = &sf_host_ops;
> >       plda->num_events = PLDA_MAX_EVENT_NUM;
> >       /* mask doorbell event */
> > -     plda->events_bitmap = GENMASK(PLDA_INT_EVENT_NUM - 1, 0)
> > -                          & ~BIT(PLDA_AXI_DOORBELL)
> > -                          & ~BIT(PLDA_PCIE_DOORBELL);
> > +     plda->events_bitmap = GENMASK(PLDA_INT_EVENT_NUM - 1, 0);
> >       plda->events_bitmap <<= PLDA_NUM_DMA_EVENTS;
> >       ret = plda_pcie_host_init(&pcie->plda, &starfive_pcie_ops,
> >                                 &stf_pcie_event);
> > --
> > 2.48.1
>
> Hi Anand
>    Mask the door bell interrupt is required. In some case, ( eg :NVMe read/write mass data) found error.

Thank you for your review comments.

I have tested using the Starfive Vision Five 2 board with a Samsung NVMe drive
and did not encounter any data read/write errors.
However, we can consider dropping this patch if there are issues with
other development boards.
I am also available to test with different NVMe modules if needed.

Thanks
-Anand