From: Lukas Wunner <lukas@wunner.de>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: Stuart Hayes <stuart.w.hayes@gmail.com>,
Austin Bolen <austin_bolen@dell.com>,
keith.busch@intel.com, Alexandru Gagniuc <mr.nuke.me@gmail.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
"Gustavo A . R . Silva" <gustavo@embeddedor.com>,
Sinan Kaya <okaya@kernel.org>,
Oza Pawandeep <poza@codeaurora.org>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
Libor Pechacek <lpechacek@suse.cz>
Subject: Re: [PATCH v4 0/3] PCI: pciehp: Do not turn off slot if presence comes up after link
Date: Tue, 11 Feb 2020 15:32:02 +0100 [thread overview]
Message-ID: <20200211143202.2sgryye4m234pymq@wunner.de> (raw)
In-Reply-To: <20200211141443.GA204966@google.com>
On Tue, Feb 11, 2020 at 08:14:44AM -0600, Bjorn Helgaas wrote:
> I'm a little confused about why pci_hp_initialize()/
> __pci_hp_initialize()/pci_hp_register()/__pci_hp_register() is such a
> rat's nest with hotplug drivers using a mix of them.
This is modeled after device registration, which can be done either
in two steps (device_initialize() + device_add()) or in 1 step
(device_register()).
So it's either pci_hp_initialize() + pci_hp_add() or pci_hp_register().
The rationale is provided in the commit message of 51bbf9bee34f
("PCI: hotplug: Demidlayer registration with the core").
> Feels like sort of a
> double-negative situation, too. Obviously the hardware bit has to be
> "1 means disabled" to be compatible with previous spec versions, but
> the code is usually easier to read if we test for something being
> *enabled*.
It's a similar situation with the "DisINTx" bit in the Command
register, which, if disabled, is shown as "DisINTx-" in lspci even
though the more intuitive notion is that INTx is *enabled*. I think
you did the right thing by showing it as "IbPresDis-" because it's
consistent with how it's done elsewhere for similar bits.
Thanks,
Lukas
next prev parent reply other threads:[~2020-02-11 14:32 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-25 19:00 [PATCH v4 0/3] PCI: pciehp: Do not turn off slot if presence comes up after link Stuart Hayes
2019-10-25 19:00 ` [PATCH v4 1/3] PCI: pciehp: Add support for disabling in-band presence Stuart Hayes
2019-10-25 19:15 ` Andy Shevchenko
2019-11-27 1:36 ` Bjorn Helgaas
2019-11-27 2:19 ` Stuart Hayes
2019-12-31 22:06 ` Stuart Hayes
2020-01-29 13:15 ` Libor Pechacek
2019-10-25 19:00 ` [PATCH v4 2/3] PCI: pciehp: Wait for PDS if in-band presence is disabled Stuart Hayes
2019-10-25 19:16 ` Andy Shevchenko
2019-10-25 19:00 ` [PATCH v4 3/3] PCI: pciehp: Add dmi table for in-band presence disabled Stuart Hayes
2019-10-25 19:18 ` Andy Shevchenko
2020-02-21 5:21 ` Bjorn Helgaas
2020-02-21 17:46 ` Stuart Hayes
2019-10-28 11:31 ` [PATCH v4 0/3] PCI: pciehp: Do not turn off slot if presence comes up after link Mika Westerberg
2020-02-08 20:22 ` Lukas Wunner
2020-02-11 0:08 ` Bjorn Helgaas
2020-02-11 4:49 ` Lukas Wunner
2020-02-11 14:14 ` Bjorn Helgaas
2020-02-11 14:32 ` Lukas Wunner [this message]
2020-02-11 19:31 ` Bjorn Helgaas
2020-02-18 17:32 ` Bjorn Helgaas
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