linux-kernel - Re: [PATCH v7 0/8] Expose and manage PCI device reset

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Message-ID: <abcbaf1b-6b5f-bddc-eba1-e1e8e3ecf40e@metux.net>
Date:   Tue, 8 Jun 2021 12:05:05 +0200
From:   "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
To:     Amey Narkhede <ameynarkhede03@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     alex.williamson@...hat.com,
        Raphael Norwitz <raphael.norwitz@...anix.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        kw@...ux.com, Shanker Donthineni <sdonthineni@...dia.com>,
        Sinan Kaya <okaya@...nel.org>, Len Brown <lenb@...nel.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH v7 0/8] Expose and manage PCI device reset

On 08.06.21 07:48, Amey Narkhede wrote:

Hi,

> PCI and PCIe devices may support a number of possible reset mechanisms
> for example Function Level Reset (FLR) provided via Advanced Feature or
> PCIe capabilities, Power Management reset, bus reset, or device specific reset.
> Currently the PCI subsystem creates a policy prioritizing these reset methods
> which provides neither visibility nor control to userspace.

Since I've got a current use case for that - could you perhaps tell more
about the whole pci device reset mechanisms ?

In my case I've got a board that wires reset lines to the soc's gpios.
Not sure how exactly to qualify this, but I guess it would count as a
bus wide reset.

Now the big question for me is how to implement that in a board specific
platform driver (which already does setup of gpios and other attached
devices), so we can reset the card in slot X in a generic way.

Any help highly appreciated.


--mtx

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Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@...ux.net -- +49-151-27565287