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From: Hans de Goede <hdegoede@redhat.com>
To: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: "Rafael J . Wysocki" <rjw@rjwysocki.net>,
	Len Brown <lenb@kernel.org>, Bjorn Helgaas <bhelgaas@google.com>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	Linux PCI <linux-pci@vger.kernel.org>
Subject: Re: [RFC 1/1] PCI/ACPI: Make acpi_pci_root_validate_resources() reject IOMEM resources which start at address 0
Date: Tue, 15 Jun 2021 13:33:22 +0200	[thread overview]
Message-ID: <fb26ac42-d047-5a01-1d16-0b5ea3e2eefc@redhat.com> (raw)
In-Reply-To: <CAJZ5v0hJ0-U7-rMApDF72xVO2PQEdbzWtVkrOQVp4xnxGHoyuA@mail.gmail.com>

Hi,

On 6/15/21 12:59 PM, Rafael J. Wysocki wrote:
> On Tue, Jun 15, 2021 at 12:26 PM Hans de Goede <hdegoede@redhat.com> wrote:
>>
>> On some Lenovo laptops the base-addrsss of some PCI devices is left
>> at 0 at boot:
>>
>> [    0.283145] pci 0000:00:15.0: [8086:34e8] type 00 class 0x0c8000
>> [    0.283217] pci 0000:00:15.0: reg 0x10: [mem 0x00000000-0x00000fff 64bit]
>> [    0.285117] pci 0000:00:15.1: [8086:34e9] type 00 class 0x0c8000
>> [    0.285189] pci 0000:00:15.1: reg 0x10: [mem 0x00000000-0x00000fff 64bit]
>>
>> There is a _CRS method for these devices, which simply returns the
>> configured 0 address. This is causing the PCI core to not assign
>> memory to these PCI devices and is causing these errors:
>>
>> [    0.655335] pci 0000:00:15.0: BAR 0: no space for [mem size 0x00001000 64bit]
>> [    0.655337] pci 0000:00:15.0: BAR 0: failed to assign [mem size 0x00001000 64bit]
>> [    0.655339] pci 0000:00:15.1: BAR 0: no space for [mem size 0x00001000 64bit]
>> [    0.655340] pci 0000:00:15.1: BAR 0: failed to assign [mem size 0x00001000 64bit]
>>
>> This happens specifically for the designware I2C PCI devices on these
>> laptops, causing I2C-HID attached touchpads/touchscreens to not work.
>>
>> Booting with nocrs on these devices results in the kernel itself
>> assigning memory to these devices, fixing things:
>>
>> [    0.355716] pci 0000:00:15.0: BAR 0: assigned [mem 0x29c000000-0x29c000fff 64bit]
>> [    0.355783] pci 0000:00:15.1: BAR 0: assigned [mem 0x29c001000-0x29c001fff 64bit]
>>
>> At least the following models are known to be affected by this (but there
>> might be more):
>>
>> Lenovo IdeaPad 3 15IIL05 81WE
>> Lenovo IdeaPad 5 14IIL05 81YH
>>
>> Add an extra check for the base-address being 0 to
>> acpi_pci_root_validate_resources() and reject IOMEM resources where this
>> is the case, to fix this issue.
>>
>> BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1871793
>> BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1868899
>> BugLink: https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe/+bug/1878279
>> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
>> ---
>> Note we could instead add the known to be affected models to the
>> pci_crs_quirks table in arch/x86/pci/acpi.c, but it is likely that more
>> systems are affected and a more generic fix seems better in general.
> 
> Also, a memory resource starting at 0 is not usable in Linux anyway
> AFAICS, at least on x86.

Right, but I was wondering about other arches. Maybe wrap the new check in
"#if IS_ENABLED(CONFIG_X86)" ?

Regards,

Hans



> 
>> ---
>>  drivers/acpi/pci_root.c | 7 +++++++
>>  1 file changed, 7 insertions(+)
>>
>> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
>> index dcd593766a64..6cd2ca551005 100644
>> --- a/drivers/acpi/pci_root.c
>> +++ b/drivers/acpi/pci_root.c
>> @@ -686,6 +686,13 @@ static void acpi_pci_root_validate_resources(struct device *dev,
>>                 if (!(res1->flags & type))
>>                         goto next;
>>
>> +               if ((type & IORESOURCE_MEM) && res1->start == 0) {
>> +                       dev_info(dev, "host bridge window %pR (ignored, start address not set)\n",
>> +                                res1);
> 
> Makes sense to me (small nit: I wouldn't break the like above).
> 
>> +                       free = true;
>> +                       goto next;
>> +               }
>> +
>>                 /* Exclude non-addressable range or non-addressable portion */
>>                 end = min(res1->end, root->end);
>>                 if (end <= res1->start) {
>> --
> 


  reply	other threads:[~2021-06-15 11:33 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-15 10:25 [RFC 0/1] " Hans de Goede
2021-06-15 10:25 ` [RFC 1/1] " Hans de Goede
2021-06-15 10:59   ` Rafael J. Wysocki
2021-06-15 11:33     ` Hans de Goede [this message]
2021-06-15 11:52       ` Rafael J. Wysocki
2021-06-15 20:23   ` Bjorn Helgaas
2021-06-16 18:43     ` Hans de Goede
2021-06-16 22:57       ` Bjorn Helgaas
2021-06-21 11:49         ` Hans de Goede
2021-06-21 12:37           ` Bjorn Helgaas
2021-07-01 14:21           ` Hans de Goede

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