linux-hardening - Re: [PATCH v2 08/11] arm64: dts: qcom: Add SM7325 device tree

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Message-ID: <36e775f9-b17f-4979-91a8-227931f6c4ea@kernel.org>
Date: Tue, 27 Aug 2024 12:45:06 +0200
From: Konrad Dybcio <konradybcio@...nel.org>
To: Danila Tikhonov <danila@...xyga.com>, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org, andersson@...nel.org,
 konradybcio@...nel.org, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, rafael@...nel.org,
 viresh.kumar@...aro.org, kees@...nel.org, tony.luck@...el.com,
 gpiccoli@...lia.com, ulf.hansson@...aro.org, andre.przywara@....com,
 quic_rjendra@...cinc.com, davidwronek@...il.com, neil.armstrong@...aro.org,
 heiko.stuebner@...rry.de, rafal@...ecki.pl, macromorgan@...mail.com,
 linus.walleij@...aro.org, lpieralisi@...nel.org,
 dmitry.baryshkov@...aro.org, fekz115@...il.com
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, netdev@...r.kernel.org,
 linux-pm@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2 08/11] arm64: dts: qcom: Add SM7325 device tree

On 21.08.2024 12:53 AM, Danila Tikhonov wrote:
> On 8/20/24 03:48, Konrad Dybcio wrote:
>> On 8.08.2024 8:40 PM, Danila Tikhonov wrote:
>>> From: Eugene Lepshy <fekz115@...il.com>
>>>
>>> The Snapdragon 778G (SM7325) / 778G+ (SM7325-AE) / 782G (SM7325-AF)
>>> is software-wise very similar to the Snapdragon 7c+ Gen 3 (SC7280).
>>>
>>> It uses the Kryo670.
>>>
>>> Signed-off-by: Eugene Lepshy <fekz115@...il.com>
>>> Signed-off-by: Danila Tikhonov <danila@...xyga.com>
>>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>>> ---
>>>   arch/arm64/boot/dts/qcom/sm7325.dtsi | 17 +++++++++++++++++
>>>   1 file changed, 17 insertions(+)
>>>   create mode 100644 arch/arm64/boot/dts/qcom/sm7325.dtsi
>>>
>>> diff --git a/arch/arm64/boot/dts/qcom/sm7325.dtsi b/arch/arm64/boot/dts/qcom/sm7325.dtsi
>>> new file mode 100644
>>> index 000000000000..5b4574484412
>>> --- /dev/null
>>> +++ b/arch/arm64/boot/dts/qcom/sm7325.dtsi
>>> @@ -0,0 +1,17 @@
>>> +// SPDX-License-Identifier: BSD-3-Clause
>>> +/*
>>> + * Copyright (c) 2024, Eugene Lepshy <fekz115@...il.com>
>>> + * Copyright (c) 2024, Danila Tikhonov <danila@...xyga.com>
>>> + */
>>> +
>>> +#include "sc7280.dtsi"
>>> +
>>> +/* SM7325 uses Kryo 670 */
>>> +&CPU0 { compatible = "qcom,kryo670"; };
>>> +&CPU1 { compatible = "qcom,kryo670"; };
>>> +&CPU2 { compatible = "qcom,kryo670"; };
>>> +&CPU3 { compatible = "qcom,kryo670"; };
>>> +&CPU4 { compatible = "qcom,kryo670"; };
>>> +&CPU5 { compatible = "qcom,kryo670"; };
>>> +&CPU6 { compatible = "qcom,kryo670"; };
>>> +&CPU7 { compatible = "qcom,kryo670"; };
>> This is a meaningless marketing name. As you mentioned in your
>> reply, cpu0-3 and cpu4-7 are wholly different (maybe cpu7 even
>> has a different MIDR part num?), we should do something about it :/
>>
>> Please post the output of `dmesg | grep "Booted secondary processor"`
>>
>> Konrad
> Sure:
> [    0.000000] Booting Linux on physical CPU 0x0000000000 [0x412fd050]
> [    0.020670] CPU1: Booted secondary processor 0x0000000100 [0x412fd050]
> [    0.036781] CPU2: Booted secondary processor 0x0000000200 [0x412fd050]
> [    0.052717] CPU3: Booted secondary processor 0x0000000300 [0x412fd050]
> [    0.070194] CPU4: Booted secondary processor 0x0000000400 [0x411fd411]
> [    0.089236] CPU5: Booted secondary processor 0x0000000500 [0x411fd411]
> [    0.109298] CPU6: Booted secondary processor 0x0000000600 [0x411fd411]
> [    0.126140] CPU7: Booted secondary processor 0x0000000700 [0x411fd411]

0x41 is Arm Ltd

0xd41 is CA78, 0xd05 is CA55

Konrad