linux-kernel - Re: [PATCH v1 1/1] x86/PCI: Disable e820 usage for the resource allocation

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Message-ID: <Yqh/UJQphSFvxX74@smile.fi.intel.com>
Date:   Tue, 14 Jun 2022 15:30:08 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, Ferry Toth <ftoth@...londelft.nl>
Subject: Re: [PATCH v1 1/1] x86/PCI: Disable e820 usage for the resource
 allocation

On Mon, Jun 13, 2022 at 10:31:39PM +0200, Hans de Goede wrote:
> On 6/13/22 22:16, Andy Shevchenko wrote:
> > The resource management improve for PCI on x86 broke booting of Intel MID
> > platforms. It seems that the current code removes all available resources
> > from the list and none of the PCI device may be initialized. Restore the
> > old behaviour by force disabling the e820 usage for the resource allocation.
> > 
> > Fixes: 4c5e242d3e93 ("x86/PCI: Clip only host bridge windows for E820 regions")
> > Depends-on: fa6dae5d8208 ("x86/PCI: Add kernel cmdline options to use/ignore E820 reserved regions")
> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> 
> Andy, thank you for the patch. Commit 4c5e242d3e93 has also been causing
> issues for other platforms, so I've submitted a revert of it here:
> 
> https://lore.kernel.org/linux-pci/20220612144325.85366-1-hdegoede@redhat.com/T/#u
> 
> can you please give the revert a try, and confirm that that fixes
> the Intel MID platform issue too ?

Nope, it doesn't fix. The problem is in flags checking as far as I can see.
My patch is needed either we have yours or not.

-- 
With Best Regards,
Andy Shevchenko