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Date: Wed, 1 Feb 2023 06:04:04 +0100
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, rostedt@...dmis.org,
ashok.raj@...el.com, tony.luck@...el.com,
linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
patches@...ts.linux.dev, ravi.v.shankar@...el.com,
thiago.macieira@...el.com, athenas.jimenez.gonzalez@...el.com,
sohil.mehta@...el.com
Subject: Re: [PATCH 3/5] platform/x86/intel/ifs: Sysfs interface for Array
BIST
On Tue, Jan 31, 2023 at 03:43:00PM -0800, Jithu Joseph wrote:
> The interface to trigger Array BIST test and obtain its result
> is similar to the existing scan test. The only notable
> difference is that, Array BIST doesn't require any test content
> to be loaded. So binary load related options are not needed for
> this test.
>
> Add sysfs interface array BIST test, the testing support will
> be added by subsequent patch.
What is "sysfs interface array" exactly?
Where is the new Documentation/ABI/ entries for these new sysfs files
you added?
>
> Signed-off-by: Jithu Joseph <jithu.joseph@...el.com>
> Reviewed-by: Tony Luck <tony.luck@...el.com>
> ---
> drivers/platform/x86/intel/ifs/ifs.h | 1 +
> drivers/platform/x86/intel/ifs/core.c | 18 +++++++++++++-----
> drivers/platform/x86/intel/ifs/runtest.c | 11 ++++++++++-
> drivers/platform/x86/intel/ifs/sysfs.c | 17 ++++++++++++++++-
> 4 files changed, 40 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/platform/x86/intel/ifs/ifs.h b/drivers/platform/x86/intel/ifs/ifs.h
> index 2cef88a88aa9..07423bc4e368 100644
> --- a/drivers/platform/x86/intel/ifs/ifs.h
> +++ b/drivers/platform/x86/intel/ifs/ifs.h
> @@ -249,5 +249,6 @@ static inline struct ifs_data *ifs_get_data(struct device *dev)
> int ifs_load_firmware(struct device *dev);
> int do_core_test(int cpu, struct device *dev);
> const struct attribute_group **ifs_get_groups(void);
> +const struct attribute_group **ifs_get_array_groups(void);
>
> #endif
> diff --git a/drivers/platform/x86/intel/ifs/core.c b/drivers/platform/x86/intel/ifs/core.c
> index ab234620ef4c..2b7a49fd473d 100644
> --- a/drivers/platform/x86/intel/ifs/core.c
> +++ b/drivers/platform/x86/intel/ifs/core.c
> @@ -25,6 +25,7 @@ static struct ifs_device ifs_devices[] = {
> [IFS_SAF] = {
> .data = {
> .integrity_cap_bit = MSR_INTEGRITY_CAPS_PERIODIC_BIST_BIT,
> + .pkg_auth = NULL,
> .test_num = IFS_SAF,
> },
> .misc = {
> @@ -36,6 +37,7 @@ static struct ifs_device ifs_devices[] = {
> [IFS_ARRAY] = {
> .data = {
> .integrity_cap_bit = MSR_INTEGRITY_CAPS_ARRAY_BIST_BIT,
> + .pkg_auth = NULL,
> .test_num = IFS_ARRAY,
> },
> .misc = {
> @@ -72,11 +74,17 @@ static int __init ifs_init(void)
> if (!(msrval & BIT(ifs_devices[i].data.integrity_cap_bit)))
> continue;
>
> - ifs_devices[i].data.pkg_auth = kmalloc_array(topology_max_packages(),
> - sizeof(bool), GFP_KERNEL);
> - if (!ifs_devices[i].data.pkg_auth)
> - continue;
> - ifs_devices[i].misc.groups = ifs_get_groups();
> + switch (ifs_devices[i].data.test_num) {
> + case IFS_SAF:
> + ifs_devices[i].data.pkg_auth = kmalloc_array(topology_max_packages(),
> + sizeof(bool), GFP_KERNEL);
> + if (!ifs_devices[i].data.pkg_auth)
> + continue;
> + ifs_devices[i].misc.groups = ifs_get_groups();
> + break;
> + case IFS_ARRAY:
> + ifs_devices[i].misc.groups = ifs_get_array_groups();
> + }
>
> if (misc_register(&ifs_devices[i].misc))
> kfree(ifs_devices[i].data.pkg_auth);
> diff --git a/drivers/platform/x86/intel/ifs/runtest.c b/drivers/platform/x86/intel/ifs/runtest.c
> index 0bfd8fcdd7e8..65e08af70994 100644
> --- a/drivers/platform/x86/intel/ifs/runtest.c
> +++ b/drivers/platform/x86/intel/ifs/runtest.c
> @@ -236,6 +236,7 @@ static void ifs_test_core(int cpu, struct device *dev)
> */
> int do_core_test(int cpu, struct device *dev)
> {
> + struct ifs_data *ifsd = ifs_get_data(dev);
> int ret = 0;
>
> /* Prevent CPUs from being taken offline during the scan test */
> @@ -247,7 +248,15 @@ int do_core_test(int cpu, struct device *dev)
> goto out;
> }
>
> - ifs_test_core(cpu, dev);
> + switch (ifsd->test_num) {
> + case IFS_SAF:
> + ifs_test_core(cpu, dev);
> + break;
> + case IFS_ARRAY:
> + default:
> + return -EINVAL;
> + }
> +
> out:
> cpus_read_unlock();
> return ret;
> diff --git a/drivers/platform/x86/intel/ifs/sysfs.c b/drivers/platform/x86/intel/ifs/sysfs.c
> index ee636a76b083..7cf32184ce6a 100644
> --- a/drivers/platform/x86/intel/ifs/sysfs.c
> +++ b/drivers/platform/x86/intel/ifs/sysfs.c
> @@ -75,7 +75,7 @@ static ssize_t run_test_store(struct device *dev,
> if (down_interruptible(&ifs_sem))
> return -EINTR;
>
> - if (!ifsd->loaded)
> + if (ifsd->test_num != IFS_ARRAY && !ifsd->loaded)
> rc = -EPERM;
> else
> rc = do_core_test(cpu, dev);
> @@ -156,3 +156,18 @@ const struct attribute_group **ifs_get_groups(void)
> {
> return plat_ifs_groups;
> }
> +
> +/* global array sysfs attributes */
> +static struct attribute *plat_ifs_array_attrs[] = {
> + &dev_attr_details.attr,
> + &dev_attr_status.attr,
> + &dev_attr_run_test.attr,
> + NULL
> +};
> +
> +ATTRIBUTE_GROUPS(plat_ifs_array);
> +
> +const struct attribute_group **ifs_get_array_groups(void)
> +{
> + return plat_ifs_array_groups;
> +}
Why do you need a function to get access to a static variable? Just
make the variable not static.
thanks,
greg k-h
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