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Currently ath11k_ahb module is not loaded successfully and the wifi
interface is not created. Kernel trace is seen while loading the
ath11k_ahb module. The issue is seen in all ath11k AHB devices except
in IPQ5018.
This happens because in ath11k_ahb_probe(), ab->mem_ce is initialized
with the value of ab->mem. However, at this instant ab->mem is not
yet set.
Later, during write to a particular memory via ath11k_ahb_write32()
this ab->mem_ce is used with particular offset. Since ab->mem_ce is
not set properly this possibly leads to memory conflict to handle
kernel paging request and the below trace is seen.
[ 93.035047] Unable to handle kernel paging request at virtual address ffff800100a00000
[ 93.035083] Mem abort info:
[ 93.041869] ESR = 0x0000000096000045
[ 93.044561] EC = 0x25: DABT (current EL), IL = 32 bits
[ 93.048377] SET = 0, FnV = 0
[ 93.053840] EA = 0, S1PTW = 0
[ 93.056704] FSC = 0x05: level 1 translation fault
[ 93.059745] Data abort info:
[ 93.064603] ISV = 0, ISS = 0x00000045
[ 93.067729] CM = 0, WnR = 1
[ 93.071287] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000042219000
[ 93.074409] [ffff800100a00000] pgd=100000007ffff003, p4d=100000007ffff003, pud=0000000000000000
[ 93.081195] Internal error: Oops: 0000000096000045 [#1] PREEMPT SMP
[ 93.089598] Modules linked in: ath11k_ahb ath11k_pci ath11k qmi_helpers
[ 93.095851] CPU: 2 PID: 66 Comm: kworker/u8:3 Not tainted 6.1.0-rc8-wt-ath-658126-g58e4b9df840c-dirty #2
[ 93.102454] Hardware name: Qualcomm Technologies, Inc. IPQ8074/AP-HK14 (DT)
[ 93.112171] Workqueue: ath11k_qmi_driver_event ath11k_qmi_driver_event_work [ath11k]
[ 93.118856] pstate: 40000005 (nZcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 93.126838] pc : ath11k_ahb_write32+0xc/0x18 [ath11k_ahb]
[ 93.133520] lr : ath11k_hal_srng_setup+0x860/0x8f0 [ath11k]
[ 93.139075] sp : ffff80000aaebb70
[ 93.144452] x29: ffff80000aaebb70 x28: 0000000000000020 x27: ffff80000aaebc50
[ 93.147934] x26: ffff000004923750 x25: ffff000004921200 x24: ffff000004928000
[ 93.155051] x23: 0000000000000020 x22: ffff000004930000 x21: ffff000004923200
[ 93.162170] x20: ffff000004920000 x19: 00000000eea00000 x18: ffff0000049200f0
[ 93.169288] x17: 0000000000000000 x16: 0000000000000000 x15: 000000000000025e
[ 93.176405] x14: ffff000003c414f0 x13: 0000000000000000 x12: 0000000000000008
[ 93.183524] x11: ffff000003c41488 x10: 0000000000000040 x9 : 0000000000000000
[ 93.190641] x8 : ffff80000a9dd100 x7 : 0000000000000000 x6 : 000000000000003f
[ 93.197759] x5 : ffff800100a00400 x4 : ffff8000031f4018 x3 : 0000000000000004
[ 93.204877] x2 : 0000000047b62000 x1 : ffff800100a00000 x0 : ffff800012000000
[ 93.211996] Call trace:
[ 93.219104] ath11k_ahb_write32+0xc/0x18 [ath11k_ahb]
[ 93.221366] ath11k_ce_init_ring+0x184/0x278 [ath11k]
[ 93.226576] ath11k_ce_init_pipes+0x4c/0x1a0 [ath11k]
[ 93.231610] ath11k_core_qmi_firmware_ready+0x3c/0x568 [ath11k]
[ 93.236646] ath11k_qmi_driver_event_work+0x168/0x4f8 [ath11k]
[ 93.242376] process_one_work+0x144/0x350
[ 93.248275] worker_thread+0x120/0x430
[ 93.252352] kthread+0xf4/0x110
[ 93.255997] ret_from_fork+0x10/0x20
[ 93.259043] Code: d503201f f94e1c00 8b214001 d50332bf (b9000022)
[ 93.262863] ---[ end trace 0000000000000000 ]---
However, for the device IPQ5018 ath11k_hw_params .ce_remap is
defined. This parameter is used to recalculate ab->mem_ce and hence,
this issue is not seen in IPQ5018.
Hence, fix this by initializing ab->mem_ce after ab->mem is set.
ab->mem is set inside the ath11k_ahb_setup_resources() therefore
initialize ab->mem_ce after ath11k_ahb_setup_resources().
Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.7.0.1-01744-QCAHKSWPL_SILICONZ-1
Fixes: b42b3678c9 ("wifi: ath11k: remap ce register space for IPQ5018")
Signed-off-by: Raj Kumar Bhagat <quic_rajkbhag@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20230113063209.7256-1-quic_rajkbhag@quicinc.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
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https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.