linux-kernel - Re: [PATCH 0/5] PCI: endpoint: Add support for additional notifiers

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Date:   Thu, 17 Jun 2021 22:35:50 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Om Prakash Singh <omp@...dia.com>
Cc:     kishon@...com, lorenzo.pieralisi@....com, bhelgaas@...gle.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, hemantk@...eaurora.org,
        smohanad@...eaurora.org
Subject: Re: [PATCH 0/5] PCI: endpoint: Add support for additional notifiers

Hi,

On Thu, Jun 17, 2021 at 12:42:07AM +0530, Om Prakash Singh wrote:
> Hi Mani,
> Adding more notifier types will surely help but I believe the list is not
> exhaustive. What you are trying here is to pass various vendor-specific epc
> interrupts to EPF driver. That can be taken care by a single notifier
> interface as well, "pci_epc_custom_notify" from your implementation.

That's what I initially thought eventhough not all the notifiers are
vendor specific. But Kishon suggested to add notifiers for generic ones
such as BME, PME etc... and that sounded reasonable to me.

> This
> also requires to have pre-defined values of "data" argument to standardize
> the interface.
> 

No, I don't think we can standardize the arguments to "custom" notifier.
The custom notifier is supposed to deal with vendor specific events and
I don't see any benefit on standardizing it. I see it more like an
opaque driver_data field where we pass driver specific arguments.

Thanks,
Mani

> your thoughts?
> 
> Thanks,
> Om
> 
> On 6/16/2021 5:29 PM, Manivannan Sadhasivam wrote:
> > External email: Use caution opening links or attachments
> > 
> > 
> > Hello,
> > 
> > This series adds support for additional notifiers in the PCI endpoint
> > framework. The notifiers LINK_DOWN, BME, PME, and D_STATE are generic
> > for all PCI endpoints but there is also a custom notifier (CUSTOM) added
> > to pass the device/vendor specific events to EPF from EPC.
> > 
> > The example usage of all notifiers is provided in the commit description.
> > 
> > Thanks,
> > Mani
> > 
> > Manivannan Sadhasivam (5):
> >    PCI: endpoint: Add linkdown notifier support
> >    PCI: endpoint: Add BME notifier support
> >    PCI: endpoint: Add PME notifier support
> >    PCI: endpoint: Add D_STATE notifier support
> >    PCI: endpoint: Add custom notifier support
> > 
> >   drivers/pci/endpoint/pci-epc-core.c | 89 +++++++++++++++++++++++++++++
> >   include/linux/pci-epc.h             |  5 ++
> >   include/linux/pci-epf.h             |  5 ++
> >   3 files changed, 99 insertions(+)
> > 
> > --
> > 2.25.1
> >