[OpenWrt-Devel] [PATCH] layerscape: kernel: cma: increase CMA buffer size from 16 to 32MB

[mail at adrianschmutzler.de]

Hi Linus,

> -----Original Message-----
> From: openwrt-devel [mailto:openwrt-devel-bounces at lists.openwrt.org]
> On Behalf Of Linus Lüssing
> Sent: Montag, 25. Mai 2020 09:40
> To: openwrt-devel at lists.openwrt.org
> Cc: Linus Lüssing <ll at simonwunderlich.de>; Sven Eckelmann
> <sven at narfation.org>
> Subject: [OpenWrt-Devel] [PATCH] layerscape: kernel: cma: increase CMA
> buffer size from 16 to 32MB
> 
> From: Linus Lüssing <ll at simonwunderlich.de>
> 
> 16MB are not enough for ath10k to initialize three 4x4 AC Wave 2 PCIe cards
> (168c:0046: Qualcomm Atheros QCA9984 802.11ac Wave 2 Wireless Network
> Adapter).
> This leads to the following error when trying to initialize the third
> one:

layerscape is already at kernel 5.4, so please patch this config file.

Despite, armv7 uses 64 MB ?

Best

Adrian

> 
> [   16.742475] ath10k_pci 0002:01:00.0: pci irq msi oper_irq_mode 2 irq_mode
> 0 reset_mode 0
> [   16.874024] ath10k_pci 0002:01:00.0: Direct firmware load for ath10k/pre-
> cal-pci-0002:01:00.0.bin failed with error -2
> [   16.884784] ath10k_pci 0002:01:00.0: Direct firmware load for ath10k/cal-
> pci-0002:01:00.0.bin failed with error -2
> [   16.895224] ath10k_pci 0002:01:00.0: Direct firmware load for
> ath10k/QCA9984/hw1.0/firmware-6.bin failed with error -2
> [   16.905956] ath10k_pci 0002:01:00.0: qca9984/qca9994 hw1.0 target
> 0x01000000 chip_id 0x00000000 sub 168c:cafe
> [   16.915881] ath10k_pci 0002:01:00.0: kconfig debug 0 debugfs 1 tracing 0 dfs
> 1 testmode 1
> [   16.925422] ath10k_pci 0002:01:00.0: firmware ver 10.4-3.9.0.2-00021 api 5
> features no-p2p,mfp,peer-flow-ctrl,btcoex-param,allows-mesh-bcast,no-ps
> crc32 9626782c
> [   18.169022] ath10k_pci 0002:01:00.0: board_file api 2 bmi_id 0:31 crc32
> cf58c3bc
> [   20.692482] cma: cma_alloc: alloc failed, req-size: 200 pages, ret: -12
> [   25.882670] ath10k_pci 0002:01:00.0: wmi service ready event not received
> [   25.943121] ath10k_pci 0002:01:00.0: could not init core (-110)
> [   25.949048] ath10k_pci 0002:01:00.0: could not probe fw (-110)
> 
> Fixing this issue by doubling the CMA buffer size from 16 to 32MB.
> New values in /proc/meminfo, with three such cards connected:
> 
> root at OpenWrt:/# cat /proc/meminfo | grep -i "cma"
> CmaTotal:          32768 kB
> CmaFree:           19268 kB
> 
> Interestingly, older Qualcomm AC cards
> (Qualcomm Atheros QCA986x/988x 802.11ac Wireless Network Adapter)
> don't seem to use the Contiguous Memory Allocator and therefore don't
> suffer from this issue.
> 
> Signed-off-by: Linus Lüssing <ll at simonwunderlich.de>
> ---
>  target/linux/layerscape/armv8_64b/config-4.14 | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/target/linux/layerscape/armv8_64b/config-4.14
> b/target/linux/layerscape/armv8_64b/config-4.14
> index c1bd718366..ef1bbadd2b 100644
> --- a/target/linux/layerscape/armv8_64b/config-4.14
> +++ b/target/linux/layerscape/armv8_64b/config-4.14
> @@ -140,7 +140,7 @@ CONFIG_CMA_ALIGNMENT=8
>  CONFIG_CMA_AREAS=7
>  # CONFIG_CMA_DEBUG is not set
>  # CONFIG_CMA_DEBUGFS is not set
> -CONFIG_CMA_SIZE_MBYTES=16
> +CONFIG_CMA_SIZE_MBYTES=32
>  # CONFIG_CMA_SIZE_SEL_MAX is not set
>  CONFIG_CMA_SIZE_SEL_MBYTES=y
>  # CONFIG_CMA_SIZE_SEL_MIN is not set
> --
> 2.27.0.rc0
> 
> 
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