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From: Amey Narkhede <ameynarkhede03@gmail.com>
To: "Enrico Weigelt, metux IT consult" <lkml@metux.net>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	Raphael Norwitz <raphael.norwitz@nutanix.com>,
	linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	kw@linux.com, Shanker Donthineni <sdonthineni@nvidia.com>,
	Sinan Kaya <okaya@kernel.org>, Len Brown <lenb@kernel.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>
Subject: Re: [PATCH v7 0/8] Expose and manage PCI device reset
Date: Tue, 8 Jun 2021 21:14:55 +0530	[thread overview]
Message-ID: <20210608154455.ho44n6dnd52ogzxj@archlinux> (raw)
In-Reply-To: <abcbaf1b-6b5f-bddc-eba1-e1e8e3ecf40e@metux.net>

On 21/06/08 12:05PM, Enrico Weigelt, metux IT consult wrote:
> 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
>
In case of bus reset(pci_reset_secondary_bus()), it uses bridge control
register to assert reset on bus so I think it should out of the box but
not 100% sure about it.

Thanks,
Amey

      reply	other threads:[~2021-06-08 15:46 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-08  5:48 [PATCH v7 0/8] Expose and manage PCI device reset Amey Narkhede
2021-06-08  5:48 ` [PATCH v7 1/8] PCI: Add pcie_reset_flr to follow calling convention of other reset methods Amey Narkhede
2021-06-10 20:15   ` Shanker R Donthineni
2021-06-17 21:57   ` Bjorn Helgaas
2021-06-17 22:51     ` Alex Williamson
2021-06-18 16:32     ` Amey Narkhede
2021-06-24 12:23   ` Bjorn Helgaas
2021-06-24 15:28     ` Amey Narkhede
2021-06-24 16:15       ` Bjorn Helgaas
2021-06-24 18:48         ` Alex Williamson
2021-06-08  5:48 ` [PATCH v7 2/8] PCI: Add new array for keeping track of ordering of " Amey Narkhede
2021-06-10 20:15   ` Shanker R Donthineni
2021-06-17 23:13   ` Bjorn Helgaas
2021-06-18 17:22     ` Amey Narkhede
2021-06-21 15:02       ` Shanker R Donthineni
2021-06-21 17:15         ` Amey Narkhede
2021-06-21 18:37           ` Bjorn Helgaas
2021-06-08  5:48 ` [PATCH v7 3/8] PCI: Remove reset_fn field from pci_dev Amey Narkhede
2021-06-10 20:16   ` Shanker R Donthineni
2021-06-08  5:48 ` [PATCH v7 4/8] PCI/sysfs: Allow userspace to query and set device reset mechanism Amey Narkhede
2021-06-09 21:57   ` Raphael Norwitz
2021-06-09 22:36     ` Shanker R Donthineni
2021-06-09 22:48       ` Raphael Norwitz
2021-06-10 20:16   ` Shanker R Donthineni
2021-06-18 20:00   ` Bjorn Helgaas
2021-06-19 13:59     ` Amey Narkhede
2021-06-21 13:01       ` Bjorn Helgaas
2021-06-21 17:28         ` Amey Narkhede
2021-06-21 19:07           ` Bjorn Helgaas
2021-06-21 19:33             ` Amey Narkhede
2021-06-23 12:06               ` Bjorn Helgaas
2021-06-23 14:07                 ` Amey Narkhede
2021-06-23 17:56                   ` Amey Narkhede
2021-06-23 17:21         ` Alex Williamson
2021-06-24 12:15   ` Bjorn Helgaas
2021-06-24 15:12     ` Amey Narkhede
2021-06-24 16:56       ` Bjorn Helgaas
2021-06-24 17:20         ` Shanker R Donthineni
2021-06-24 17:28         ` Amey Narkhede
2021-06-24 17:59           ` Bjorn Helgaas
2021-06-08  5:48 ` [PATCH v7 5/8] PCI: Setup ACPI_COMPANION early Amey Narkhede
2021-06-08  5:48 ` [PATCH v7 6/8] PCI: Add support for ACPI _RST reset method Amey Narkhede
2021-06-08  5:48 ` [PATCH v7 7/8] PCI: Enable NO_BUS_RESET quirk for Nvidia GPUs Amey Narkhede
2021-06-10 23:16   ` Bjorn Helgaas
2021-06-10 23:33     ` Shanker R Donthineni
2021-06-10 23:43     ` Shanker R Donthineni
2021-06-10 23:53       ` Bjorn Helgaas
2021-06-11  4:15         ` Shanker R Donthineni
2021-06-08  5:48 ` [PATCH v7 8/8] PCI: Change the type of probe argument in reset functions Amey Narkhede
2021-06-09 21:40   ` Raphael Norwitz
2021-06-08 10:05 ` [PATCH v7 0/8] Expose and manage PCI device reset Enrico Weigelt, metux IT consult
2021-06-08 15:44   ` Amey Narkhede [this message]

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