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Subject: Re: Regression: QCA6390 fails with "mm/page_alloc: place pages to
 tail in __free_pages_core()"
To:     Vlastimil Babka <vbabka@suse.cz>,
        Kalle Valo <kvalo@codeaurora.org>, david@redhat.com
Cc:     ath11k@lists.infradead.org, linux-mm@kvack.org,
        akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
        linux-wireless@vger.kernel.org
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From:   Pavel Procopiuc <pavel.procopiuc@gmail.com>
Message-ID: <2dfa9cd3-5b95-3e0b-8ffa-64d38540c573@gmail.com>
Date:   Thu, 5 Nov 2020 11:45:56 +0100
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Op 05.11.2020 om 11:42 schreef Vlastimil Babka:
> Let me paste from the ath11k discussion:
> 
>> * Relevant errors from the log:
>> # journalctl -b | grep -iP '05:00|ath11k'
>> Nov 02 10:41:26 razor kernel: pci 0000:05:00.0: [17cb:1101] type 00 class 0x028000
>> Nov 02 10:41:26 razor kernel: pci 0000:05:00.0: reg 0x10: [mem 0xd2100000-0xd21fffff 64bit]
>> Nov 02 10:41:26 razor kernel: pci 0000:05:00.0: PME# supported from D0 D3hot D3cold
>> Nov 02 10:41:26 razor kernel: pci 0000:05:00.0: 4.000 Gb/s available PCIe bandwidth, limited by 5.0 GT/s PCIe x1 link 
>> at 0000:00:1c.1 (capable of 7.876 Gb/s with 8.0 GT/s PCIe x1 link)
>> Nov 02 10:41:26 razor kernel: pci 0000:05:00.0: Adding to iommu group 21
>> Nov 02 10:41:27 razor kernel: ath11k_pci 0000:05:00.0: WARNING: ath11k PCI support is experimental!
>> Nov 02 10:41:27 razor kernel: ath11k_pci 0000:05:00.0: BAR 0: assigned [mem 0xd2100000-0xd21fffff 64bit]
>> Nov 02 10:41:27 razor kernel: ath11k_pci 0000:05:00.0: enabling device (0000 -> 0002)
>> Nov 02 10:41:27 razor kernel: mhi 0000:05:00.0: Requested to power ON
>> Nov 02 10:41:27 razor kernel: mhi 0000:05:00.0: Power on setup success
>> Nov 02 10:41:27 razor kernel: ath11k_pci 0000:05:00.0: Respond mem req failed, result: 1, err: 0
> 
> This seems to be ath11k_qmi_respond_fw_mem_request(). Why is it failure with error 0? No idea.
> 
> What would happen if all the GFP_KERNEL in the file were changed to GFP_DMA32?
> 
> I'm thinking the hardware perhaps doesn't like too high physical addresses or something. But if I think correctly, 
> freeing to tail should actually move them towards head. So it's weird.

Well, in fact I still have this particular error, although the hardware works correctly. This is my current log:

# journalctl -b | grep -iP '05:00|ath11k|Linux version'
Nov 05 09:43:31 razor kernel: Linux version 5.10.0-rc2 (root@razor) (gcc (Gentoo 9.3.0-r1 p3) 9.3.0, GNU ld (Gentoo 2.34 
p6) 2.34.0) #4 SMP Thu Nov 5 09:26:00 CET 2020
Nov 05 09:43:31 razor kernel: pci 0000:05:00.0: [17cb:1101] type 00 class 0x028000
Nov 05 09:43:31 razor kernel: pci 0000:05:00.0: reg 0x10: [mem 0xd2100000-0xd21fffff 64bit]
Nov 05 09:43:31 razor kernel: pci 0000:05:00.0: PME# supported from D0 D3hot D3cold
Nov 05 09:43:31 razor kernel: pci 0000:05:00.0: 4.000 Gb/s available PCIe bandwidth, limited by 5.0 GT/s PCIe x1 link at 
0000:00:1c.1 (capable of 7.876 Gb/s with 8.0 GT/s PCIe x1 link)
Nov 05 09:43:31 razor kernel: pci 0000:05:00.0: Adding to iommu group 21
Nov 05 09:43:32 razor kernel: ath11k_pci 0000:05:00.0: WARNING: ath11k PCI support is experimental!
Nov 05 09:43:32 razor kernel: ath11k_pci 0000:05:00.0: BAR 0: assigned [mem 0xd2100000-0xd21fffff 64bit]
Nov 05 09:43:32 razor kernel: ath11k_pci 0000:05:00.0: enabling device (0000 -> 0002)
Nov 05 09:43:32 razor kernel: mhi 0000:05:00.0: Requested to power ON
Nov 05 09:43:32 razor kernel: mhi 0000:05:00.0: Power on setup success
Nov 05 09:43:32 razor kernel: ath11k_pci 0000:05:00.0: Respond mem req failed, result: 1, err: 0
Nov 05 09:43:32 razor kernel: ath11k_pci 0000:05:00.0: qmi failed to respond fw mem req:-22
Nov 05 09:43:32 razor kernel: ath11k_pci 0000:05:00.0: chip_id 0x0 chip_family 0xb board_id 0xff soc_id 0xffffffff
Nov 05 09:43:32 razor kernel: ath11k_pci 0000:05:00.0: fw_version 0x101c06cc fw_build_timestamp 2020-06-24 19:50 fw_build_id
Nov 05 09:43:33 razor NetworkManager[777]: <info>  [1604565813.8043] rfkill1: found Wi-Fi radio killswitch (at 
/sys/devices/pci0000:00/0000:00:1c.1/0000:05:00.0/ieee80211/phy0/rfkill1) (driver ath11k_pci)
Nov 05 09:43:35 razor ModemManager[720]: <info>  Couldn't check support for device 
'/sys/devices/pci0000:00/0000:00:1c.1/0000:05:00.0': not supported by any plugin