linux-kernel - Re: [PATCH V2 3/3] Revert "ACPI,PCI,IRQ: remove SCI penalize function"

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Date:   Wed, 5 Oct 2016 15:38:52 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Sinan Kaya <okaya@...eaurora.org>
cc:     linux-acpi@...r.kernel.org, rjw@...ysocki.net, bhelgaas@...gle.com,
        ravikanth.nalla@....com, linux@...nbow-software.org,
        timur@...eaurora.org, cov@...eaurora.org, jcm@...hat.com,
        alex.williamson@...hat.com, linux-pci@...r.kernel.org,
        agross@...eaurora.org, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, wim@....tudelft.nl,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 3/3] Revert "ACPI,PCI,IRQ: remove SCI penalize
 function"

On Tue, 4 Oct 2016, Sinan Kaya wrote:

> The SCI function was removed in two steps (first refactor and then remove).
> This patch does the revert in one step.
> 
> The commit 103544d86976 ("ACPI,PCI,IRQ: reduce resource requirements")
> refactored the original code so that SCI penalty is calculated dynamically
> by the time get_penalty function is called. This patch does a partial
> revert for the SCI functionality only.
> 
> The commit 9e5ed6d1fb87 ("ACPI,PCI,IRQ: remove SCI penalize function") is
> for the removal of the function. SCI penalty API was replaced by the
> runtime penalty calculation based on the value of
> acpi_gbl_FADT.sci_interrupt.
> 
> The IRQ type does not get updated at the right time for some platforms and
> results in incorrect penalty assignment for PCI IRQs as
> irq_get_trigger_type returns the wrong type.
> 
> The register_gsi function delivers the IRQ found in the ACPI table to
> the interrupt controller driver.  Penalties are calculated before a
> link object is enabled to find out which interrupt has the least number
> of users. By the time penalties are calculated, the IRQ is not registered
> yet and the API returns the wrong type.
> 
> Tested-by: Jonathan Liu <net147@...il.com>
> Tested-by: Ondrej Zary <linux@...nbow-software.org>
> Link: https://lkml.org/lkml/2016/10/4/283
> Signed-off-by: Sinan Kaya <okaya@...eaurora.org>

Acked-by: Thomas Gleixner <tglx@...utronix.de>