linux-kernel - Re: [PATCH v2 2/7] PCI: ACPI: PM: Do not use pci_platform_pm

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Date:   Thu, 23 Sep 2021 15:51:13 +0200
From:   Ferry Toth <fntoth@...il.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: Re: [PATCH v2 2/7] PCI: ACPI: PM: Do not use pci_platform_pm_ops for
 ACPI

Repost (with formatting removed, sorry for the noise)
Op 23-09-2021 om 13:30 schreef Rafael J. Wysocki:
> On Wed, Sep 22, 2021 at 11:31 PM Ferry Toth<fntoth@...il.com>  wrote:
>> Hi,
>> Op 20-09-2021 om 21:17 schreef Rafael J. Wysocki:
>>> From: Rafael J. Wysocki<rafael.j.wysocki@...el.com>
>>>
>>> Using struct pci_platform_pm_ops for ACPI adds unnecessary
>>> indirection to the interactions between the PCI core and ACPI PM,
>>> which is also subject to retpolines.
>>>
>>> Moreover, it is not particularly clear from the current code that,
>>> as far as PCI PM is concerned, "platform" really means just ACPI
>>> except for the special casess when Intel MID PCI PM is used or when
>>> ACPI support is disabled (through the kernel config or command line,
>>> or because there are no usable ACPI tables on the system).
>>>
>>> To address the above, rework the PCI PM code to invoke ACPI PM
>>> functions directly as needed and drop the acpi_pci_platform_pm
>>> object that is not necessary any more.
>>>
>>> Accordingly, update some of the ACPI PM functions in question to do
>>> extra checks in case the ACPI support is disabled (which previously
>>> was taken care of by avoiding to set the pci_platform_ops pointer
>>> in those cases).
>>>
>>> Signed-off-by: Rafael J. Wysocki<rafael.j.wysocki@...el.com>
>>> ---
>>>
>>> v1 -> v2:
>>>       * Rebase on top of the new [1/7] and move dropping struct
>>>         pci_platform_pm_ops to a separate patch.
>> I wanted to test this series on 5.15-rc2 but this patch 2/7 doesn't
>> apply (after 1/7 applied). Should I apply this on another tree?
> This is on top of
> https://patchwork.kernel.org/project/linux-acpi/patch/2793105.e9J7NaK4W3@kreacher/
> which is not yet in any tree.
>
> Sorry for the confusion.
No problem at all. If I can I will try to report back tonight. Else, 
will be delayed 2 due to a short break.