Re: ath11k allocation failure on resume breaking wifi until power cycle

[Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>]

On Wed, Feb 21, 2024 at 08:34:23AM -0800, Jeff Johnson wrote:
> On 2/21/2024 6:39 AM, Vlastimil Babka wrote:
> > Hi,
> > 
> > starting with 6.8 rc series, I'm experiencing problems on resume from s2idle
> > on my laptop, which is Lenovo T14s Gen3:
> > 
> > LENOVO 21CRS0K63K/21CRS0K63K, BIOS R22ET65W (1.35 )
> > ath11k_pci 0000:01:00.0: wcn6855 hw2.1
> > ath11k_pci 0000:01:00.0: chip_id 0x12 chip_family 0xb board_id 0xff soc_id 0x400c1211
> > ath11k_pci 0000:01:00.0: fw_version 0x1106196e fw_build_timestamp 2024-01-12 11:30 fw_build_id WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.37
> > 
> > The problem is an allocation failure happening on resume from s2idle. After
> > that the wifi stops working and even a reboot won't fix it, only a
> > poweroff/poweron cycle of the laptop.
> > 

Looks like WLAN is powered down during s2idle, which doesn't make sense. I hope
Jeff will figure out what's going on.

But if you can share the dmesg after enabling the debug prints of both ath11k
and MHI, it will help a lot.

- Mani

> > This is order 4 (costly order), GFP_NOIO (maybe it's originally GFP_KERNEL
> > but we restrict to GFP_NOIO during resume) allocation, thus it's impossible
> > to do memory compaction and the page allocator gives up. Such high-order
> > allocations should have a fallback using smaller pages, or maybe it could at
> > least retry once the restricted GFP_NOIO context is gone.
> > 
> > I don't know why it never happened before 6.8, didn't spot anything obvious
> > and it happens too unreliably to go bisect. Any idea?
> 
> I've asked the development team to look at this, but in the interim can
> you apply the two hibernation patchsets to see if those cleanups also
> fix your problem:
> 
> [PATCH 0/5] wifi: ath11k: prepare for hibernation support
> https://lore.kernel.org/linux-wireless/20240221024725.10057-1-quic_bqiang@quicinc.com
> 
> [PATCH 0/3] wifi: ath11k: hibernation support
> https://lore.kernel.org/linux-wireless/20240221030026.10553-1-quic_bqiang@quicinc.com

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