linux-kernel - Re: [PATCH net-next v4 07/11] arch: x86: Add IPC mailbox accessor function and add SoC register access

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Date: Fri, 2 Feb 2024 11:04:15 +0800
From: Choong Yong Liang <yong.liang.choong@...ux.intel.com>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Rajneesh Bhardwaj <irenic.rajneesh@...il.com>,
 David E Box <david.e.box@...ux.intel.com>,
 Hans de Goede <hdegoede@...hat.com>, Mark Gross <markgross@...nel.org>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Jose Abreu <Jose.Abreu@...opsys.com>, "David S . Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Richard Cochran <richardcochran@...il.com>,
 Russell King <linux@...linux.org.uk>, Alexei Starovoitov <ast@...nel.org>,
 Daniel Borkmann <daniel@...earbox.net>,
 Jesper Dangaard Brouer <hawk@...nel.org>,
 John Fastabend <john.fastabend@...il.com>, Andrew Lunn <andrew@...n.ch>,
 Heiner Kallweit <hkallweit1@...il.com>,
 Philipp Zabel <p.zabel@...gutronix.de>, Andrew Halaney
 <ahalaney@...hat.com>, Simon Horman <simon.horman@...igine.com>,
 Serge Semin <fancer.lancer@...il.com>, Netdev <netdev@...r.kernel.org>,
 LKML <linux-kernel@...r.kernel.org>,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, platform-driver-x86@...r.kernel.org,
 linux-hwmon@...r.kernel.org, bpf@...r.kernel.org,
 Voon Wei Feng <weifeng.voon@...el.com>,
 Michael Sit Wei Hong <michael.wei.hong.sit@...el.com>,
 Lai Peter Jun Ann <jun.ann.lai@...el.com>,
 Abdul Rahim Faizal <faizal.abdul.rahim@...el.com>
Subject: Re: [PATCH net-next v4 07/11] arch: x86: Add IPC mailbox accessor
 function and add SoC register access

On 31/1/2024 6:54 pm, Ilpo Järvinen wrote:
> On Mon, 29 Jan 2024, Choong Yong Liang wrote:
> 
>> From: "David E. Box" <david.e.box@...ux.intel.com>
>>
>> - Exports intel_pmc_ipc() for host access to the PMC IPC mailbox
>> - Add support to use IPC command allows host to access SoC registers
>> through PMC firmware that are otherwise inaccessible to the host due to
>> security policies.
>>
>> Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
>> Signed-off-by: Chao Qin <chao.qin@...el.com>
>> Signed-off-by: Choong Yong Liang <yong.liang.choong@...ux.intel.com>
>> ---
>>   MAINTAINERS                                   |  2 +
>>   arch/x86/Kconfig                              |  9 +++
>>   arch/x86/platform/intel/Makefile              |  1 +
>>   arch/x86/platform/intel/pmc_ipc.c             | 75 +++++++++++++++++++
>>   .../linux/platform_data/x86/intel_pmc_ipc.h   | 34 +++++++++
>>   5 files changed, 121 insertions(+)
>>   create mode 100644 arch/x86/platform/intel/pmc_ipc.c
>>   create mode 100644 include/linux/platform_data/x86/intel_pmc_ipc.h
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 8709c7cd3656..441eb921edef 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -10973,8 +10973,10 @@ M:	Rajneesh Bhardwaj <irenic.rajneesh@...il.com>
>>   M:	David E Box <david.e.box@...el.com>
>>   L:	platform-driver-x86@...r.kernel.org
>>   S:	Maintained
>> +F:	arch/x86/platform/intel/pmc_ipc.c
>>   F:	Documentation/ABI/testing/sysfs-platform-intel-pmc
>>   F:	drivers/platform/x86/intel/pmc/
>> +F:	linux/platform_data/x86/intel_pmc_ipc.h
>>   
>>   INTEL PMIC GPIO DRIVERS
>>   M:	Andy Shevchenko <andy@...nel.org>
>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>> index 5edec175b9bf..bceae28b9381 100644
>> --- a/arch/x86/Kconfig
>> +++ b/arch/x86/Kconfig
>> @@ -666,6 +666,15 @@ config X86_AMD_PLATFORM_DEVICE
>>   	  I2C and UART depend on COMMON_CLK to set clock. GPIO driver is
>>   	  implemented under PINCTRL subsystem.
>>   
>> +config INTEL_PMC_IPC
>> +	tristate "Intel Core SoC Power Management Controller IPC mailbox"
>> +	depends on ACPI
>> +	help
>> +	  This option enables sideband register access support for Intel SoC
>> +	  power management controller IPC mailbox.
>> +
>> +	  If you don't require the option or are in doubt, say N.
>> +
>>   config IOSF_MBI
>>   	tristate "Intel SoC IOSF Sideband support for SoC platforms"
>>   	depends on PCI
>> diff --git a/arch/x86/platform/intel/Makefile b/arch/x86/platform/intel/Makefile
>> index dbee3b00f9d0..470fc68de6ba 100644
>> --- a/arch/x86/platform/intel/Makefile
>> +++ b/arch/x86/platform/intel/Makefile
>> @@ -1,2 +1,3 @@
>>   # SPDX-License-Identifier: GPL-2.0-only
>>   obj-$(CONFIG_IOSF_MBI)			+= iosf_mbi.o
>> +obj-$(CONFIG_INTEL_PMC_IPC)		+= pmc_ipc.o
>> \ No newline at end of file
> 
> New line missing.
> 
> 
Thank you for letting me know.
I will fix it in the new patch series.