linux-kernel - Re: [PATCH v2 04/10] platform/x86/intel/ifs: Load IFS Image

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Message-ID: <Yk/CW+a7cyB8NbRd@kroah.com>
Date:   Fri, 8 Apr 2022 07:04:27 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jithu Joseph <jithu.joseph@...el.com>
Cc:     hdegoede@...hat.com, markgross@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com, corbet@....net,
        andriy.shevchenko@...ux.intel.com, ashok.raj@...el.com,
        tony.luck@...el.com, rostedt@...dmis.org, dan.j.williams@...el.com,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, patches@...ts.linux.dev,
        ravi.v.shankar@...el.com
Subject: Re: [PATCH v2 04/10] platform/x86/intel/ifs: Load IFS Image

On Thu, Apr 07, 2022 at 12:13:41PM -0700, Jithu Joseph wrote:
> IFS uses a scan image format that shares the same header as
> microcode updates and deployment approach for these images mirrors
> that of microcode update. Specifically, enable images to be deployed
> relative to a static symlink in /lib/firmware and then load
> into kernel memory via request_firmware().
> 
> The image is specific to a processor family, model and stepping.
> IFS requires that a test image be loaded before any ifs test is
> initiated. Load the image that matches processor signature.
> The IFS image is signed by Intel.
> 
> The IFS image file follows a similar naming convention as used for
> Intel CPU microcode files. The file must be located in the firmware
> directory where the microcode files are placed and named as {family/model
> /stepping}.scan as below:
> 
> /lib/firmware/intel/ifs/{ff-mm-ss}.scan
> 
> Reviewed-by: Tony Luck <tony.luck@...el.com>
> Signed-off-by: Jithu Joseph <jithu.joseph@...el.com>
> ---
>  drivers/platform/x86/intel/ifs/Makefile |  2 +-
>  drivers/platform/x86/intel/ifs/core.c   | 62 ++++++++++++++++++++
>  drivers/platform/x86/intel/ifs/ifs.h    | 15 +++++
>  drivers/platform/x86/intel/ifs/load.c   | 76 +++++++++++++++++++++++++
>  4 files changed, 154 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/platform/x86/intel/ifs/load.c
> 
> diff --git a/drivers/platform/x86/intel/ifs/Makefile b/drivers/platform/x86/intel/ifs/Makefile
> index c44305dff542..b69d026ca9da 100644
> --- a/drivers/platform/x86/intel/ifs/Makefile
> +++ b/drivers/platform/x86/intel/ifs/Makefile
> @@ -1,3 +1,3 @@
>  obj-$(CONFIG_INTEL_IFS)			+= intel_ifs.o
>  
> -intel_ifs-objs				:= core.o
> +intel_ifs-objs				:= core.o load.o
> diff --git a/drivers/platform/x86/intel/ifs/core.c b/drivers/platform/x86/intel/ifs/core.c
> index 87956623208f..716f333a064b 100644
> --- a/drivers/platform/x86/intel/ifs/core.c
> +++ b/drivers/platform/x86/intel/ifs/core.c
> @@ -2,10 +2,14 @@
>  /* Copyright(c) 2022 Intel Corporation. */
>  
>  #include <linux/module.h>
> +#include <linux/platform_device.h>
>  #include <asm/cpu_device_id.h>
>  
>  #include "ifs.h"
>  
> +struct platform_device *ifs_pdev;
> +struct ifs_binary ifs_binary;

Please no static memory.  Use the driver model properly which does not
want you to do this at all.

You should not need this at all.  If you do, something is wrong as you
are tying the lifecycle of the memory to the code, not to the device.

{sigh}

greg k-h