From: kai.heng.feng@canonical.com (Kai-Heng Feng)
Subject: [Regression] Commit "nvme/pci: Use host managed power state for suspend" has problems
Date: Wed, 31 Jul 2019 02:50:01 +0800 [thread overview]
Message-ID: <8246360B-F7D9-42EB-94FC-82995A769E28@canonical.com> (raw)
In-Reply-To: <100ba4aff1c6434a81e47774ab4acddc@AUSX13MPC105.AMER.DELL.COM>
at 01:14, <Mario.Limonciello@dell.com> <Mario.Limonciello@dell.com> wrote:
>> -----Original Message-----
>> From: Keith Busch <kbusch at kernel.org>
>> Sent: Tuesday, July 30, 2019 9:42 AM
>> To: Rafael J. Wysocki
>> Cc: Busch, Keith; Limonciello, Mario; Kai-Heng Feng; Christoph Hellwig;
>> Sagi
>> Grimberg; linux-nvme; Linux PM; Linux Kernel Mailing List; Rajat Jain
>> Subject: Re: [Regression] Commit "nvme/pci: Use host managed power state
>> for
>> suspend" has problems
>>
>>
>> [EXTERNAL EMAIL]
>>
>> On Tue, Jul 30, 2019@03:45:31AM -0700, Rafael J. Wysocki wrote:
>>> So I can reproduce this problem with plain 5.3-rc1 and the patch below
>>> fixes it.
>>>
>>> Also Mario reports that the same patch needs to be applied for his 9380
>>> to
>> reach
>>> SLP_S0 after some additional changes under testing/review now, so here it
>> goes.
>>> [The changes mentioned above are in the pm-s2idle-testing branch in the
>>> linux-pm.git tree at kernel.org.]
>>>
>>> ---
>>> From: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
>>> Subject: [PATCH] nvme-pci: Do not prevent PCI bus-level PM from being
>>> used
>>>
>>> One of the modifications made by commit d916b1be94b6 ("nvme-pci: use
>>> host managed power state for suspend") was adding a pci_save_state()
>>> call to nvme_suspend() in order to prevent the PCI bus-level PM from
>>> being applied to the suspended NVMe devices, but that causes the NVMe
>>> drive (PC401 NVMe SK hynix 256GB) in my Dell XPS13 9380 to prevent
>>> the SoC from reaching package idle states deeper than PC3, which is
>>> way insufficient for system suspend.
>>>
>>> Fix this issue by removing the pci_save_state() call in question.
>>
>> I'm okay with the patch if we can get confirmation this doesn't break
>> any previously tested devices. I recall we add the pci_save_state() in
>> the first place specifically to prevent PCI D3 since that was reported
>> to break some devices' low power settings. Kai-Heng or Mario, any input
>> here?
>
> It's entirely possible that in fixing the shutdown/flush/send NVME power
> state command
> that D3 will be OK now but it will take some time to double check across
> the variety of disks that
> we tested before.
Just did a quick test, this patch regress SK Hynix BC501, the SoC stays at
PC3 once the patch is applied.
Kai-Heng
>
> What's kernel policy in terms of adding a module parameter and removing
> it later? My gut
> reaction is I'd like to see that behind a module parameter and if we see
> that all the disks
> are actually OK we can potentially rip it out in a future release. Also
> gives us a knob for easier
> wider testing outside of the 4 of us.
>
>>> Fixes: d916b1be94b6 ("nvme-pci: use host managed power state for
>>> suspend")
>>> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
>>> ---
>>> drivers/nvme/host/pci.c | 8 +-------
>>> 1 file changed, 1 insertion(+), 7 deletions(-)
>>>
>>> Index: linux-pm/drivers/nvme/host/pci.c
>> ==============================================================
>> =====
>>> --- linux-pm.orig/drivers/nvme/host/pci.c
>>> +++ linux-pm/drivers/nvme/host/pci.c
>>> @@ -2897,14 +2897,8 @@ static int nvme_suspend(struct device *d
>>> nvme_dev_disable(ndev, true);
>>> ctrl->npss = 0;
>>> ret = 0;
>>> - goto unfreeze;
>>> }
>>> - /*
>>> - * A saved state prevents pci pm from generically controlling the
>>> - * device's power. If we're using protocol specific settings, we don't
>>> - * want pci interfering.
>>> - */
>>> - pci_save_state(pdev);
>>> +
>>> unfreeze:
>>> nvme_unfreeze(ctrl);
>>> return ret;
next prev parent reply other threads:[~2019-07-30 18:50 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-25 9:51 [Regression] Commit "nvme/pci: Use host managed power state for suspend" has problems Rafael J. Wysocki
2019-07-25 14:02 ` Kai-Heng Feng
2019-07-25 16:23 ` Mario.Limonciello
2019-07-25 17:03 ` Rafael J. Wysocki
2019-07-25 17:23 ` Mario.Limonciello
2019-07-25 18:20 ` Kai-Heng Feng
2019-07-25 19:09 ` Mario.Limonciello
2019-07-30 10:45 ` Rafael J. Wysocki
2019-07-30 14:41 ` Keith Busch
2019-07-30 17:14 ` Mario.Limonciello
2019-07-30 18:50 ` Kai-Heng Feng [this message]
2019-07-30 19:19 ` Keith Busch
2019-07-30 21:05 ` Mario.Limonciello
2019-07-30 21:31 ` Keith Busch
2019-07-31 21:25 ` Rafael J. Wysocki
2019-07-31 22:19 ` Keith Busch
2019-07-31 22:33 ` Rafael J. Wysocki
2019-08-01 9:05 ` Kai-Heng Feng
2019-08-01 17:29 ` Rafael J. Wysocki
2019-08-01 19:05 ` Mario.Limonciello
2019-08-01 22:26 ` Rafael J. Wysocki
2019-08-02 10:55 ` Kai-Heng Feng
2019-08-02 11:04 ` Rafael J. Wysocki
2019-08-05 19:13 ` Kai-Heng Feng
2019-08-05 21:28 ` Rafael J. Wysocki
2019-08-06 14:02 ` Mario.Limonciello
2019-08-06 15:00 ` Rafael J. Wysocki
2019-08-07 10:29 ` Rafael J. Wysocki
2019-08-01 20:22 ` Keith Busch
2019-08-07 9:48 ` Rafael J. Wysocki
2019-08-07 10:45 ` Christoph Hellwig
2019-08-07 10:54 ` Rafael J. Wysocki
2019-08-07 9:53 ` [PATCH] nvme-pci: Do not prevent PCI bus-level PM from being used Rafael J. Wysocki
2019-08-07 10:14 ` Rafael J. Wysocki
2019-08-07 10:43 ` Christoph Hellwig
2019-08-07 14:37 ` Keith Busch
2019-08-08 8:36 ` [PATCH] nvme-pci: Allow PCI bus-level PM to be used if ASPM is disabled Rafael J. Wysocki
2019-08-08 8:48 ` Christoph Hellwig
2019-08-08 9:06 ` Rafael J. Wysocki
2019-08-08 10:03 ` [PATCH v2 0/2] " Rafael J. Wysocki
2019-08-08 10:06 ` [PATCH v2 1/2] PCI: PCIe: ASPM: Introduce pcie_aspm_enabled_mask() Rafael J. Wysocki
2019-08-08 13:15 ` Bjorn Helgaas
2019-08-08 14:48 ` Rafael J. Wysocki
2019-08-08 10:10 ` [PATCH v2 2/2] nvme-pci: Allow PCI bus-level PM to be used if ASPM is disabled Rafael J. Wysocki
2019-08-08 13:43 ` Bjorn Helgaas
2019-08-08 14:47 ` Rafael J. Wysocki
2019-08-08 17:06 ` Rafael J. Wysocki
2019-08-08 18:39 ` Bjorn Helgaas
2019-08-08 20:01 ` Keith Busch
2019-08-08 20:05 ` Mario.Limonciello
2019-08-08 20:41 ` Rafael J. Wysocki
2019-08-09 4:47 ` Bjorn Helgaas
2019-08-09 8:04 ` Rafael J. Wysocki
2019-08-08 21:51 ` [PATCH v3 0/2] " Rafael J. Wysocki
2019-08-08 21:55 ` [PATCH v3 1/2] PCI: PCIe: ASPM: Introduce pcie_aspm_enabled() Rafael J. Wysocki
2019-08-09 4:50 ` Bjorn Helgaas
2019-08-09 8:00 ` Rafael J. Wysocki
2019-10-07 22:34 ` Bjorn Helgaas
2019-10-08 9:27 ` Rafael J. Wysocki
2019-10-08 21:16 ` Bjorn Helgaas
2019-10-08 22:54 ` Rafael J. Wysocki
2019-10-09 12:49 ` Bjorn Helgaas
2019-08-08 21:58 ` [PATCH v3 2/2] nvme-pci: Allow PCI bus-level PM to be used if ASPM is disabled Rafael J. Wysocki
2019-08-08 22:13 ` [PATCH v3 0/2] " Keith Busch
2019-08-09 8:05 ` Rafael J. Wysocki
2019-08-09 14:52 ` Keith Busch
2019-07-25 16:59 ` [Regression] Commit "nvme/pci: Use host managed power state for suspend" has problems Rafael J. Wysocki
2019-07-25 14:52 ` Keith Busch
2019-07-25 19:48 ` Rafael J. Wysocki
2019-07-25 19:52 ` Keith Busch
2019-07-25 20:02 ` Rafael J. Wysocki
2019-07-26 14:02 ` Kai-Heng Feng
2019-07-27 12:55 ` Rafael J. Wysocki
2019-07-29 15:51 ` Mario.Limonciello
2019-07-29 22:05 ` Rafael J. Wysocki
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