linux-kernel - Re: [PATCH 4/4] PCI/sysfs: Allow userspace to query and set device reset mechanism

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Message-ID: <20210315135226.avwmnhkfsgof6ihw@pali>
Date:   Mon, 15 Mar 2021 14:52:26 +0100
From:   Pali Rohár <pali@...nel.org>
To:     Amey Narkhede <ameynarkhede03@...il.com>
Cc:     bhelgaas@...gle.com, alex.williamson@...hat.com,
        raphael.norwitz@...anix.com, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH 4/4] PCI/sysfs: Allow userspace to query and set device
 reset mechanism

On Monday 15 March 2021 19:13:23 Amey Narkhede wrote:
> slot reset (pci_dev_reset_slot_function) and secondary bus
> reset(pci_parent_bus_reset) which I think are hot reset and
> warm reset respectively.

No. PCI secondary bus reset = PCIe Hot Reset. Slot reset is just another
type of reset, which is currently implemented only for PCIe hot plug
bridges and for PowerPC PowerNV platform and it just call PCI secondary
bus reset with some other hook. PCIe Warm Reset does not have API in
kernel and therefore drivers do not export this type of reset via any
kernel function (yet).