From: Greg KH <gregkh@linuxfoundation.org>
To: "Luck, Tony" <tony.luck@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>,
Hans de Goede <hdegoede@redhat.com>,
markgross@kernel.org, Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
X86 ML <x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
Jonathan Corbet <corbet@lwn.net>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
"Joseph, Jithu" <jithu.joseph@intel.com>,
"Raj, Ashok" <ashok.raj@intel.com>,
Steven Rostedt <rostedt@goodmis.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Doc Mailing List <linux-doc@vger.kernel.org>,
platform-driver-x86@vger.kernel.org, patches@lists.linux.dev,
Ravi V Shankar <ravi.v.shankar@intel.com>
Subject: Re: [PATCH v3 03/11] platform/x86/intel/ifs: Create device for Intel IFS (In Field Scan)
Date: Wed, 20 Apr 2022 19:46:11 +0200 [thread overview]
Message-ID: <YmBG44t4dYsUl4Aa@kroah.com> (raw)
In-Reply-To: <YmAmebezoc8m6n2E@agluck-desk3.sc.intel.com>
On Wed, Apr 20, 2022 at 08:27:53AM -0700, Luck, Tony wrote:
> On Wed, Apr 20, 2022 at 09:48:58AM +0200, Greg KH wrote:
> > Don't write code today for stuff you do not have right now, you all know
> > that. We can always revisit it in the future.
>
> Direction check on the virtual device option. Is this what
> you are asking for in "core.c"?
>
> The second test type is happening internally right away ... so I
> put in some example code of how it can be added. Upstream submission
> will just have the one test that exists today.
>
> Static definition of:
>
> static struct ifs_data ifs_data[IFS_NUMTESTS];
>
> keeps the code simpler (no need to have code to
> cleanup if dynamic allocation of this small structure
> fails). But if you feel strongly that all static allocation
> is bad, then I can kzallloc() per enumerated test type.
>
> With this change it is no longer a platform driver. So maybe
> doesn't belong in drivers/platform/x86/intel/ifs/*
>
> Any thoughts on where I should move it to?
>
> -Tony
>
> ---- core.c ---
>
> // SPDX-License-Identifier: GPL-2.0-only
> /* Copyright(c) 2022 Intel Corporation. */
>
> #include <linux/module.h>
> #include <linux/device.h>
> #include <linux/kdev_t.h>
> #include <linux/semaphore.h>
>
> #include <asm/cpu_device_id.h>
>
> #include "ifs.h"
>
> enum test_types {
> IFS_SAF,
> IFS_ANOTHER,
> IFS_NUMTESTS
> };
>
> static struct class *ifs_class;
> static struct ifs_data ifs_data[IFS_NUMTESTS];
>
> #define MSR_IA32_CORE_CAPS_INTEGRITY_BIT 2
> #define MSR_IA32_CORE_CAPS_INTEGRITY BIT(MSR_IA32_CORE_CAPS_INTEGRITY_BIT)
>
> #define X86_MATCH(model) \
> X86_MATCH_VENDOR_FAM_MODEL_FEATURE(INTEL, 6, \
> INTEL_FAM6_##model, X86_FEATURE_CORE_CAPABILITIES, NULL)
>
> static const struct x86_cpu_id ifs_cpu_ids[] __initconst = {
> X86_MATCH(SAPPHIRERAPIDS_X),
> {}
> };
> MODULE_DEVICE_TABLE(x86cpu, ifs_cpu_ids);
>
> static int ifs_device_unregister(struct device *dev, void *data)
> {
> device_unregister(dev);
>
> return 0;
> }
>
> static int __init ifs_init(void)
> {
> const struct x86_cpu_id *m;
> u64 ia32_core_caps;
> struct device *dev;
> int ndevices = 0;
> int ret = 0;
>
> m = x86_match_cpu(ifs_cpu_ids);
> if (!m)
> return -ENODEV;
>
> if (rdmsrl_safe(MSR_IA32_CORE_CAPS, &ia32_core_caps))
> return -ENODEV;
>
> ifs_class = class_create(THIS_MODULE, "intel_ifs");
Why do you need a class? Why not just use a misc device? Saves you
loads of boilerplate code that is sometimes tricky to get correct.
thanks,
greg k-h
next prev parent reply other threads:[~2022-04-20 17:46 UTC|newest]
Thread overview: 152+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-07 19:13 [PATCH v2 00/10] Introduce In Field Scan driver Jithu Joseph
2022-04-07 19:13 ` [PATCH v2 01/10] x86/microcode/intel: expose collect_cpu_info_early() for IFS Jithu Joseph
2022-04-08 8:34 ` Borislav Petkov
2022-04-21 14:56 ` Thomas Gleixner
2022-04-07 19:13 ` [PATCH v2 02/10] Documentation: In-Field Scan Jithu Joseph
2022-04-07 19:13 ` [PATCH v2 03/10] platform/x86/intel/ifs: Add driver for " Jithu Joseph
2022-04-07 19:13 ` [PATCH v2 04/10] platform/x86/intel/ifs: Load IFS Image Jithu Joseph
2022-04-08 5:02 ` Greg KH
2022-04-08 5:04 ` Greg KH
2022-04-07 19:13 ` [PATCH v2 05/10] platform/x86/intel/ifs: Check IFS Image sanity Jithu Joseph
2022-04-07 19:13 ` [PATCH v2 06/10] platform/x86/intel/ifs: Authenticate and copy to secured memory Jithu Joseph
2022-04-07 19:13 ` [PATCH v2 07/10] platform/x86/intel/ifs: Add scan test support Jithu Joseph
2022-04-07 19:13 ` [PATCH v2 08/10] platform/x86/intel/ifs: Add IFS sysfs interface Jithu Joseph
2022-04-08 4:59 ` Greg KH
2022-04-07 19:13 ` [PATCH v2 09/10] platform/x86/intel/ifs: add ABI documentation for IFS Jithu Joseph
2022-04-08 5:02 ` Greg KH
2022-04-07 19:13 ` [PATCH v2 10/10] trace: platform/x86/intel/ifs: Add trace point to track Intel IFS operations Jithu Joseph
2022-04-19 16:38 ` [PATCH v3 00/11] Introduce In Field Scan driver Tony Luck
2022-04-19 16:38 ` [PATCH v3 01/11] x86/microcode/intel: Expose collect_cpu_info_early() for IFS Tony Luck
2022-04-19 16:38 ` [PATCH v3 02/11] Documentation: In-Field Scan Tony Luck
2022-04-19 16:48 ` Greg KH
2022-04-19 19:45 ` Dan Williams
2022-04-20 7:48 ` Greg KH
2022-04-19 16:38 ` [PATCH v3 03/11] platform/x86/intel/ifs: Create device for Intel IFS (In Field Scan) Tony Luck
2022-04-19 16:47 ` Greg KH
2022-04-19 18:09 ` Dan Williams
2022-04-19 22:28 ` Dan Williams
2022-04-20 7:49 ` Greg KH
2022-04-20 7:48 ` Greg KH
2022-04-20 15:27 ` Luck, Tony
2022-04-20 17:46 ` Greg KH [this message]
2022-04-20 17:57 ` Luck, Tony
2022-04-20 18:04 ` Greg KH
2022-04-20 18:08 ` Luck, Tony
2022-04-20 19:04 ` Greg KH
2022-04-19 16:38 ` [PATCH v3 04/11] platform/x86/intel/ifs: Add stub driver for In-Field Scan Tony Luck
2022-04-19 16:38 ` [PATCH v3 05/11] platform/x86/intel/ifs: Read IFS firmware image Tony Luck
2022-04-19 17:14 ` Greg KH
2022-04-19 16:38 ` [PATCH v3 06/11] platform/x86/intel/ifs: Check IFS Image sanity Tony Luck
2022-04-19 17:16 ` Greg KH
2022-04-19 16:38 ` [PATCH v3 07/11] platform/x86/intel/ifs: Authenticate and copy to secured memory Tony Luck
2022-04-19 16:38 ` [PATCH v3 08/11] platform/x86/intel/ifs: Add scan test support Tony Luck
2022-04-19 16:38 ` [PATCH v3 09/11] platform/x86/intel/ifs: Add IFS sysfs interface Tony Luck
2022-04-19 17:20 ` Greg KH
2022-04-19 17:35 ` Luck, Tony
2022-04-19 17:58 ` Greg KH
2022-04-19 18:15 ` Dan Williams
2022-04-19 18:24 ` Dan Williams
2022-04-19 16:38 ` [PATCH v3 10/11] trace: platform/x86/intel/ifs: Add trace point to track Intel IFS operations Tony Luck
2022-04-20 23:38 ` Steven Rostedt
2022-04-21 4:26 ` Luck, Tony
2022-04-21 12:41 ` Steven Rostedt
2022-04-19 16:38 ` [PATCH v3 11/11] platform/x86/intel/ifs: add ABI documentation for IFS Tony Luck
2022-04-22 20:02 ` [PATCH v4 00/10] Introduce In Field Scan driver Tony Luck
2022-04-22 20:02 ` [PATCH v4 01/10] x86/microcode/intel: Expose collect_cpu_info_early() for IFS Tony Luck
2022-04-22 20:02 ` [PATCH v4 02/10] x86/msr-index: Define INTEGRITY_CAPABILITIES MSR Tony Luck
2022-04-22 20:02 ` [PATCH v4 03/10] platform/x86/intel/ifs: Add stub driver for In-Field Scan Tony Luck
2022-04-22 20:02 ` [PATCH v4 04/10] platform/x86/intel/ifs: Read IFS firmware image Tony Luck
2022-04-26 10:45 ` Greg KH
2022-04-26 16:12 ` Luck, Tony
2022-04-26 16:36 ` Greg KH
2022-04-26 18:47 ` Luck, Tony
2022-04-22 20:02 ` [PATCH v4 05/10] platform/x86/intel/ifs: Check IFS Image sanity Tony Luck
2022-04-22 20:02 ` [PATCH v4 06/10] platform/x86/intel/ifs: Authenticate and copy to secured memory Tony Luck
2022-04-22 20:02 ` [PATCH v4 07/10] platform/x86/intel/ifs: Add scan test support Tony Luck
2022-04-22 20:02 ` [PATCH v4 08/10] platform/x86/intel/ifs: Add IFS sysfs interface Tony Luck
2022-04-22 20:02 ` [PATCH v4 09/10] trace: platform/x86/intel/ifs: Add trace point to track Intel IFS operations Tony Luck
2022-04-25 14:52 ` Steven Rostedt
2022-04-25 16:49 ` Luck, Tony
2022-04-26 1:49 ` Steven Rostedt
2022-04-26 23:53 ` Luck, Tony
2022-04-27 2:42 ` Steven Rostedt
2022-04-22 20:02 ` [PATCH v4 10/10] platform/x86/intel/ifs: add ABI documentation for IFS Tony Luck
2022-04-28 15:38 ` [PATCH v5 00/10] Introduce In Field Scan driver Tony Luck
2022-04-28 15:38 ` [PATCH v5 01/10] x86/microcode/intel: Expose collect_cpu_info_early() for IFS Tony Luck
2022-05-03 15:29 ` Borislav Petkov
2022-05-04 10:28 ` Thomas Gleixner
2022-04-28 15:38 ` [PATCH v5 02/10] x86/msr-index: Define INTEGRITY_CAPABILITIES MSR Tony Luck
2022-04-28 15:38 ` [PATCH v5 03/10] platform/x86/intel/ifs: Add stub driver for In-Field Scan Tony Luck
2022-05-04 10:35 ` Thomas Gleixner
2022-05-04 16:24 ` Luck, Tony
2022-05-04 16:28 ` Borislav Petkov
2022-04-28 15:38 ` [PATCH v5 04/10] platform/x86/intel/ifs: Read IFS firmware image Tony Luck
2022-05-04 10:37 ` Thomas Gleixner
2022-05-04 16:49 ` Luck, Tony
2022-04-28 15:38 ` [PATCH v5 05/10] platform/x86/intel/ifs: Check IFS Image sanity Tony Luck
2022-04-28 15:38 ` [PATCH v5 06/10] platform/x86/intel/ifs: Authenticate and copy to secured memory Tony Luck
2022-05-04 10:48 ` Thomas Gleixner
2022-04-28 15:38 ` [PATCH v5 07/10] platform/x86/intel/ifs: Add scan test support Tony Luck
2022-05-04 12:29 ` Thomas Gleixner
2022-05-04 18:52 ` Luck, Tony
2022-05-04 23:15 ` Thomas Gleixner
2022-05-05 8:28 ` Peter Zijlstra
2022-05-05 9:01 ` Thomas Gleixner
2022-05-05 18:32 ` Luck, Tony
2022-05-05 20:21 ` Peter Zijlstra
2022-04-28 15:38 ` [PATCH v5 08/10] platform/x86/intel/ifs: Add IFS sysfs interface Tony Luck
2022-04-28 15:38 ` [PATCH v5 09/10] trace: platform/x86/intel/ifs: Add trace point to track Intel IFS operations Tony Luck
2022-04-28 15:38 ` [PATCH v5 10/10] platform/x86/intel/ifs: add ABI documentation for IFS Tony Luck
2022-04-28 15:58 ` [PATCH v5 00/10] Introduce In Field Scan driver Greg KH
2022-04-28 16:07 ` Luck, Tony
2022-05-02 15:15 ` Hans de Goede
2022-05-02 17:23 ` Luck, Tony
2022-05-03 15:32 ` Borislav Petkov
2022-05-03 16:04 ` Luck, Tony
2022-05-03 16:26 ` Luck, Tony
2022-05-06 14:19 ` Hans de Goede
2022-05-06 15:53 ` Luck, Tony
2022-05-06 18:41 ` Hans de Goede
2022-05-09 17:05 ` Luck, Tony
2022-05-09 18:12 ` Hans de Goede
2022-05-06 1:40 ` [PATCH v6 00/11] " Tony Luck
2022-05-06 1:40 ` [PATCH v6 01/11] x86/microcode/intel: Expose collect_cpu_info_early() for IFS Tony Luck
2022-05-06 1:40 ` [PATCH v6 02/11] x86/msr-index: Define INTEGRITY_CAPABILITIES MSR Tony Luck
2022-05-06 8:19 ` Thomas Gleixner
2022-05-06 1:40 ` [PATCH v6 03/11] stop_machine: Add stop_core_cpuslocked() for per-core operations Tony Luck
2022-05-06 8:20 ` Thomas Gleixner
2022-05-06 1:40 ` [PATCH v6 04/11] platform/x86/intel/ifs: Add stub driver for In-Field Scan Tony Luck
2022-05-06 8:23 ` Thomas Gleixner
2022-05-06 1:40 ` [PATCH v6 05/11] platform/x86/intel/ifs: Read IFS firmware image Tony Luck
2022-05-06 1:40 ` [PATCH v6 06/11] platform/x86/intel/ifs: Check IFS Image sanity Tony Luck
2022-05-06 1:40 ` [PATCH v6 07/11] platform/x86/intel/ifs: Authenticate and copy to secured memory Tony Luck
2022-05-06 1:40 ` [PATCH v6 08/11] platform/x86/intel/ifs: Add scan test support Tony Luck
2022-05-06 13:30 ` Thomas Gleixner
2022-05-06 18:49 ` Luck, Tony
2022-05-06 19:06 ` Thomas Gleixner
2022-05-06 1:40 ` [PATCH v6 09/11] platform/x86/intel/ifs: Add IFS sysfs interface Tony Luck
2022-05-06 1:40 ` [PATCH v6 10/11] trace: platform/x86/intel/ifs: Add trace point to track Intel IFS operations Tony Luck
2022-05-06 1:40 ` [PATCH v6 11/11] platform/x86/intel/ifs: add ABI documentation for IFS Tony Luck
2022-05-06 22:53 ` [PATCH v7 00/12] Introduce In Field Scan driver Tony Luck
2022-05-06 22:53 ` [PATCH v7 01/12] x86/microcode/intel: Expose collect_cpu_info_early() for IFS Tony Luck
2022-05-06 22:54 ` [PATCH v7 02/12] x86/msr-index: Define INTEGRITY_CAPABILITIES MSR Tony Luck
2022-05-06 22:54 ` [PATCH v7 03/12] stop_machine: Add stop_core_cpuslocked() for per-core operations Tony Luck
2022-05-06 22:54 ` [PATCH v7 04/12] platform/x86/intel/ifs: Add stub driver for In-Field Scan Tony Luck
2022-05-06 22:54 ` [PATCH v7 05/12] platform/x86/intel/ifs: Read IFS firmware image Tony Luck
2022-05-09 12:11 ` Thomas Gleixner
2022-05-06 22:54 ` [PATCH v7 06/12] platform/x86/intel/ifs: Check IFS Image sanity Tony Luck
2022-05-09 12:11 ` Thomas Gleixner
2022-05-09 16:31 ` Borislav Petkov
2022-05-09 16:51 ` Luck, Tony
2022-05-09 16:56 ` Borislav Petkov
2022-05-06 22:54 ` [PATCH v7 07/12] platform/x86/intel/ifs: Authenticate and copy to secured memory Tony Luck
2022-05-09 12:11 ` Thomas Gleixner
2022-05-06 22:54 ` [PATCH v7 08/12] platform/x86/intel/ifs: Add scan test support Tony Luck
2022-05-09 12:11 ` Thomas Gleixner
2022-05-06 22:54 ` [PATCH v7 09/12] platform/x86/intel/ifs: Add IFS sysfs interface Tony Luck
2022-05-09 12:12 ` Thomas Gleixner
2022-05-06 22:54 ` [PATCH v7 10/12] trace: platform/x86/intel/ifs: Add trace point to track Intel IFS operations Tony Luck
2022-05-06 22:54 ` [PATCH v7 11/12] platform/x86/intel/ifs: add ABI documentation for IFS Tony Luck
2022-05-06 22:54 ` [PATCH v7 12/12] Documentation: In-Field Scan Tony Luck
2022-05-09 12:16 ` Thomas Gleixner
2022-05-11 15:51 ` [PATCH v7 00/12] Introduce In Field Scan driver Hans de Goede
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