linux-kernel - Re: [PATCH 3/4] MFD: Intel Out of Band Management Services Module (OOBMSM) driver

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Message-ID: <YNxEr+X8GozvxNrW@dell>
Date:   Wed, 30 Jun 2021 11:17:19 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     "David E. Box" <david.e.box@...ux.intel.com>
Cc:     hdegoede@...hat.com, mgross@...ux.intel.com, bhelgaas@...gle.com,
        linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH 3/4] MFD: Intel Out of Band Management Services Module
 (OOBMSM) driver

On Thu, 17 Jun 2021, David E. Box wrote:

> The Intel Out of Band Management Services Module (OOBMSM) is a device
> that provides access to Intel capabilities described in PCIE vendor
> specific extended capability registers (both VSEC and DVSEC). These
> capabilities include features like Intel Platform Monitoring Technology
> as well as others that are not supported by the intel_pmt driver. Add a
> driver for creating platform devices for these capabilities coming from
> OOBMSM.
> 
> Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
> ---
>  MAINTAINERS                  |  1 +
>  drivers/mfd/Kconfig          | 11 +++++++
>  drivers/mfd/Makefile         |  1 +
>  drivers/mfd/intel_oobmsm.c   | 61 ++++++++++++++++++++++++++++++++++++
>  drivers/platform/x86/Kconfig |  4 +--
>  5 files changed, 76 insertions(+), 2 deletions(-)
>  create mode 100644 drivers/mfd/intel_oobmsm.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index ebdc2a0f794b..0961e3f89497 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -9356,6 +9356,7 @@ INTEL PMT DRIVER
>  M:	"David E. Box" <david.e.box@...ux.intel.com>
>  S:	Maintained
>  F:	drivers/mfd/intel_extended_cap.c
> +F:	drivers/mfd/intel_oobmsm.c
>  F:	drivers/mfd/intel_pmt.c
>  F:	drivers/platform/x86/intel_pmt_*
>  
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 4dde8e223a9e..269312de2666 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -687,6 +687,17 @@ config MFD_INTEL_PMT
>  	  Telemetry, Watcher, and Crashlog PMT capabilities/devices for
>  	  platforms starting from Tiger Lake.
>  
> +config MFD_INTEL_OOBMSM
> +	tristate "Intel Out Of Band Management Services Module (OOBMSM) support"
> +	depends on PCI
> +	select MFD_INTEL_EXTENDED_CAPS
> +	help
> +	  The Intel Out of Band Management Service Module driver is used to
> +	  enumerate auxiliary platform features described in both Vendor
> +	  Specific and Designated Vendor Specific PCIe config space. Supported
> +	  features include Intel Platform Monitoring Technology (PMT) as well
> +	  as other non-PMT capabilities.
> +
>  config MFD_IPAQ_MICRO
>  	bool "Atmel Micro ASIC (iPAQ h3100/h3600/h3700) Support"
>  	depends on SA1100_H3100 || SA1100_H3600
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 7fa35399ec76..50fa38810bbd 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -213,6 +213,7 @@ obj-$(CONFIG_MFD_INTEL_EXTENDED_CAPS)	+= intel_extended_caps.o
>  obj-$(CONFIG_MFD_INTEL_LPSS)	+= intel-lpss.o
>  obj-$(CONFIG_MFD_INTEL_LPSS_PCI)	+= intel-lpss-pci.o
>  obj-$(CONFIG_MFD_INTEL_LPSS_ACPI)	+= intel-lpss-acpi.o
> +obj-$(CONFIG_MFD_INTEL_OOBMSM)	+= intel_oobmsm.o
>  obj-$(CONFIG_MFD_INTEL_PMC_BXT)	+= intel_pmc_bxt.o
>  obj-$(CONFIG_MFD_INTEL_PMT)	+= intel_pmt.o
>  obj-$(CONFIG_MFD_PALMAS)	+= palmas.o
> diff --git a/drivers/mfd/intel_oobmsm.c b/drivers/mfd/intel_oobmsm.c
> new file mode 100644
> index 000000000000..c66532f11c29
> --- /dev/null
> +++ b/drivers/mfd/intel_oobmsm.c
> @@ -0,0 +1,61 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Intel Out of Band Management Services Module driver
> + *
> + * Copyright (c) 2021, Intel Corporation.
> + * All Rights Reserved.
> + *
> + * Author: David E. Box <david.e.box@...ux.intel.com>
> + */
> +
> +#include <linux/module.h>
> +#include <linux/pci.h>
> +#include <linux/pm_runtime.h>

This doesn't appear to have anything to do with MFD?

> +#include "intel_extended_caps.h"
> +
> +static int intel_oobmsm_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> +{
> +	struct intel_ext_cap_platform_info *info;
> +	int ret;
> +
> +	ret = pcim_enable_device(pdev);
> +	if (ret)
> +		return ret;
> +
> +	info = (struct intel_ext_cap_platform_info *)id->driver_data;
> +
> +	ret = intel_ext_cap_probe(pdev, info);
> +	if (ret)
> +		return ret;
> +
> +	pm_runtime_put(&pdev->dev);
> +	pm_runtime_allow(&pdev->dev);
> +
> +	return 0;
> +}
> +
> +static void intel_oobmsm_pci_remove(struct pci_dev *pdev)
> +{
> +	pm_runtime_forbid(&pdev->dev);
> +	pm_runtime_get_sync(&pdev->dev);
> +}
> +
> +#define PCI_DEVICE_ID_INTEL_PMT_OOBMSM	0x09a7
> +static const struct pci_device_id intel_oobmsm_pci_ids[] = {
> +	{ PCI_DEVICE_DATA(INTEL, PMT_OOBMSM, NULL) },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(pci, intel_oobmsm_pci_ids);
> +
> +static struct pci_driver intel_oobmsm_pci_driver = {
> +	.name = "intel-oobmsm",
> +	.id_table = intel_oobmsm_pci_ids,
> +	.probe = intel_oobmsm_pci_probe,
> +	.remove = intel_oobmsm_pci_remove,
> +};
> +module_pci_driver(intel_oobmsm_pci_driver);
> +
> +MODULE_AUTHOR("David E. Box <david.e.box@...ux.intel.com>");
> +MODULE_DESCRIPTION("Intel Out of Band Management Services Module driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> index 60592fb88e7a..4dd3af9f848e 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -1226,7 +1226,7 @@ config INTEL_PMT_CLASS
>  
>  config INTEL_PMT_TELEMETRY
>  	tristate "Intel Platform Monitoring Technology (PMT) Telemetry driver"
> -	depends on MFD_INTEL_PMT
> +	depends on MFD_INTEL_PMT || MFD_INTEL_OOBMSM
>  	select INTEL_PMT_CLASS
>  	help
>  	  The Intel Platform Monitory Technology (PMT) Telemetry driver provides
> @@ -1238,7 +1238,7 @@ config INTEL_PMT_TELEMETRY
>  
>  config INTEL_PMT_CRASHLOG
>  	tristate "Intel Platform Monitoring Technology (PMT) Crashlog driver"
> -	depends on MFD_INTEL_PMT
> +	depends on MFD_INTEL_PMT || MFD_INTEL_OOBMSM
>  	select INTEL_PMT_CLASS
>  	help
>  	  The Intel Platform Monitoring Technology (PMT) crashlog driver provides

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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