On 11/5/20 10:04 AM, Kalle Valo wrote:
(changing the subject, adding more lists and people)
Pavel Procopiuc <pavel.procopiuc@xxxxxxxxx> writes:
Op 04.11.2020 om 10:12 schreef Kalle Valo:
Yeah, it is unfortunately time consuming but it is the best way to get
bottom of this.
I have found the commit that breaks things for me, it's
7fef431be9c9ac255838a9578331567b9dba4477 mm/page_alloc: place pages to
tail in __free_pages_core()
I've reverted it on top of the 5.10-rc2 and ath11k driver loads fine
and I have wifi working.
Oh, very interesting. Thanks a lot for the bisection, otherwise we would
have never found out whats causing this.
David & mm folks: Pavel noticed that his QCA6390 Wi-Fi 6 device (driver
ath11k) failed on v5.10-rc1. After bisecting he found that the commit
below causes the regression. I have not been able to reproduce this and
for me QCA6390 works fine. I don't know if this needs a specific kernel
configuration or what's the difference between our setups.
Any ideas what might cause this and how to fix it?
Full discussion: http://lists.infradead.org/pipermail/ath11k/2020-November/000501.html
commit 7fef431be9c9ac255838a9578331567b9dba4477
Author: David Hildenbrand <david@xxxxxxxxxx>
AuthorDate: Thu Oct 15 20:09:35 2020 -0700
Commit: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
CommitDate: Fri Oct 16 11:11:18 2020 -0700
mm/page_alloc: place pages to tail in __free_pages_core()
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.
Nov 02 10:41:27 razor kernel: ath11k_pci 0000:05:00.0: qmi failed to respond fw mem req:-22
Nov 02 10:41:32 razor kernel: ath11k_pci 0000:05:00.0: qmi failed memory request, err = -110
Nov 02 10:41:32 razor kernel: ath11k_pci 0000:05:00.0: qmi failed to respond fw mem req:-110
Nov 02 10:42:58 razor kernel: mhi 0000:05:00.0: Device failed to exit MHI Reset state
