linux-kernel - Re:Re: [PATCH] Revert "ACPI: power: Turn off unused power resources unconditionally"

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Date:   Mon, 17 May 2021 17:48:10 +0800 (CST)
From:   wsj20369 <wsj20369@....com>
To:     "Zhang Rui" <rui.zhang@...el.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "lenb@...nel.org" <lenb@...nel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "David Box" <david.e.box@...ux.intel.com>
Subject: Re:Re: [PATCH] Revert "ACPI: power: Turn off unused power resources
 unconditionally"

At 2021-05-10 21:59:03, "Zhang Rui" <rui.zhang@...el.com> wrote:
>On Mon, 2021-05-10 at 14:13 +0200, Rafael J. Wysocki wrote:
>> On Mon, May 10, 2021 at 8:37 AM Zhang, Rui <rui.zhang@...el.com>
>> wrote:
>> > 
>> > Hi, Shujun,
>> > 
>> > I'm experiencing similar problem, and it should be a BIOS problem,
>> 
>> Right, and I confused things.  Sorry about that.
>> 
>> If commit 7e4fdeafa61f2b653f ("ACPI: power: Turn off unused power
>> resources unconditionally") causes problems to happen, this means
>> that
>> the platform firmware implementation doesn't follow the ACPI
>> specification.
>> 
>> > which can be fixed by a customized DSDT.
>> > Can you please attach the full acpidump output on this machine? I
>> > just want to make sure if it is the same problem.
>> 
>> Yes, please.
>> 
>> Rui, can you create a BZ for this please and can you both attach
>> dmidecode output from the affected systems?
>> 
>> I don't want to revert this commit completely, so the default
>> behavior
>> is spec-compliant, but there can be a DMI-based blacklist for systems
>> having problems with it.
>> 
>Done.
>https://bugzilla.kernel.org/show_bug.cgi?id=213019
>
>Shujun,
>can you please attach the acpidump and dmidecode output in this bug
>report?
>
>thanks,
>rui

Hi Rui:

Sorry for late, I have attached the acpidump and dmidecode in the https://bugzilla.kernel.org/show_bug.cgi?id=213019

BR
Shujun Wang

>
>> > > -----Original Message-----
>> > > From: Shujun Wang <wsj20369@....com>
>> > > Sent: Friday, April 30, 2021 8:42 PM
>> > > To: rjw@...ysocki.net; lenb@...nel.org; 
>> > > linux-acpi@...r.kernel.org; linux-
>> > > kernel@...r.kernel.org
>> > > Cc: Shujun Wang <wsj20369@....com>
>> > > Subject: [PATCH] Revert "ACPI: power: Turn off unused power
>> > > resources
>> > > unconditionally"
>> > > 
>> > > This reverts commit 7e4fdeafa61f2b653fcf9678f09935e55756aed2.
>> > > It may cause some NVMe device probes to fail, and the system may
>> > > get stuck
>> > > when using an NVMe device as the root filesystem.
>> > > 
>> > > In the function nvme_pci_enable(struct nvme_dev *dev), as shown
>> > > below,
>> > > readl(NVME_REG_CSTS) always returns -1 with the commit, which
>> > > results in
>> > > the probe failed.
>> > > 
>> > >   if (readl(dev->bar + NVME_REG_CSTS) == -1) {
>> > >       result = -ENODEV;
>> > >       goto disable;
>> > >   }
>> > > 
>> > > dmesg:
>> > >   [    1.106280] nvme 0000:04:00.0: platform quirk: setting
>> > > simple suspend
>> > >   [    1.109111] nvme nvme0: pci function 0000:04:00.0
>> > >   [    1.113066] nvme 0000:04:00.0: enabling device (0000 ->
>> > > 0002)
>> > >   [    1.121040] nvme nvme0: Removing after probe failure status:
>> > > -19
>> > > 
>> > > lspci:
>> > >   Non-Volatile memory controller: KIOXIA Corporation Device 0001
>> > > 
>> > > device uevent:
>> > >   DRIVER=nvme
>> > >   PCI_CLASS=10802
>> > >   PCI_ID=1E0F:0001
>> > >   PCI_SUBSYS_ID=1E0F:0001
>> > >   PCI_SLOT_NAME=0000:04:00.0
>> > >   MODALIAS=pci:v00001E0Fd00000001sv00001E0Fsd00000001bc01sc08i02
>> > > 
>> > > This patch was tested in Lenovo Thinkpad X1.
>> > > 
>> > > Signed-off-by: Shujun Wang <wsj20369@....com>
>> > > ---
>> > >  drivers/acpi/power.c | 11 ++++++++++-
>> > >  1 file changed, 10 insertions(+), 1 deletion(-)
>> > > 
>> > > diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c index
>> > > 56102eaaa2da..8bf10abeb2e0 100644
>> > > --- a/drivers/acpi/power.c
>> > > +++ b/drivers/acpi/power.c
>> > > @@ -1004,9 +1004,18 @@ void
>> > > acpi_turn_off_unused_power_resources(void)
>> > >       mutex_lock(&power_resource_list_lock);
>> > > 
>> > >       list_for_each_entry_reverse(resource,
>> > > &acpi_power_resource_list,
>> > > list_node) {
>> > > +             int result, state;
>> > > +
>> > >               mutex_lock(&resource->resource_lock);
>> > > 
>> > > -             if (!resource->ref_count) {
>> > > +             result = acpi_power_get_state(resource-
>> > > >device.handle,
>> > > &state);
>> > > +             if (result) {
>> > > +                     mutex_unlock(&resource->resource_lock);
>> > > +                     continue;
>> > > +             }
>> > > +
>> > > +             if (state == ACPI_POWER_RESOURCE_STATE_ON
>> > > +                 && !resource->ref_count) {
>> > >                       dev_info(&resource->device.dev, "Turning
>> > > OFF\n");
>> > >                       __acpi_power_off(resource);
>> > >               }
>> > > --
>> > > 2.25.1