linux-kernel - [PATCH v3 5/8] platform/x86/intel/ifs: Sysfs interface for Array BIST

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Date:   Tue, 28 Feb 2023 17:59:39 -0800
From:   Jithu Joseph <jithu.joseph@...el.com>
To:     hdegoede@...hat.com, markgross@...nel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        gregkh@...uxfoundation.org, rostedt@...dmis.org,
        jithu.joseph@...el.com, 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: [PATCH v3 5/8] platform/x86/intel/ifs: Sysfs interface for Array BIST

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 for array BIST test, the testing support will
be added by subsequent patch.

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    |  2 ++
 drivers/platform/x86/intel/ifs/runtest.c | 10 +++++++++-
 drivers/platform/x86/intel/ifs/sysfs.c   | 10 +++++++++-
 4 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/intel/ifs/ifs.h b/drivers/platform/x86/intel/ifs/ifs.h
index b8b956e29653..f31966e291df 100644
--- a/drivers/platform/x86/intel/ifs/ifs.h
+++ b/drivers/platform/x86/intel/ifs/ifs.h
@@ -250,5 +250,6 @@ extern bool *ifs_pkg_auth;
 int ifs_load_firmware(struct device *dev);
 int do_core_test(int cpu, struct device *dev);
 extern struct attribute *plat_ifs_attrs[];
+extern struct attribute *plat_ifs_array_attrs[];
 
 #endif
diff --git a/drivers/platform/x86/intel/ifs/core.c b/drivers/platform/x86/intel/ifs/core.c
index 2237aaba7078..c74accedfc8d 100644
--- a/drivers/platform/x86/intel/ifs/core.c
+++ b/drivers/platform/x86/intel/ifs/core.c
@@ -22,6 +22,7 @@ static const struct x86_cpu_id ifs_cpu_ids[] __initconst = {
 MODULE_DEVICE_TABLE(x86cpu, ifs_cpu_ids);
 
 ATTRIBUTE_GROUPS(plat_ifs);
+ATTRIBUTE_GROUPS(plat_ifs_array);
 
 bool *ifs_pkg_auth;
 
@@ -45,6 +46,7 @@ static struct ifs_device ifs_devices[] = {
 		.misc = {
 			.name = "intel_ifs_1",
 			.minor = MISC_DYNAMIC_MINOR,
+			.groups = plat_ifs_array_groups,
 		},
 	},
 };
diff --git a/drivers/platform/x86/intel/ifs/runtest.c b/drivers/platform/x86/intel/ifs/runtest.c
index 0bfd8fcdd7e8..969b3e0946d5 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 +248,14 @@ int do_core_test(int cpu, struct device *dev)
 		goto out;
 	}
 
-	ifs_test_core(cpu, dev);
+	switch (ifsd->ro_info->test_num) {
+	case IFS_TYPE_SAF:
+		ifs_test_core(cpu, dev);
+		break;
+	case IFS_TYPE_ARRAY_BIST:
+	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 2007d8054f04..88234798080a 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->ro_info->test_num != IFS_TYPE_ARRAY_BIST && !ifsd->loaded)
 		rc = -EPERM;
 	else
 		rc = do_core_test(cpu, dev);
@@ -149,3 +149,11 @@ struct attribute *plat_ifs_attrs[] = {
 	&dev_attr_image_version.attr,
 	NULL
 };
+
+/* global array sysfs attributes */
+struct attribute *plat_ifs_array_attrs[] = {
+	&dev_attr_details.attr,
+	&dev_attr_status.attr,
+	&dev_attr_run_test.attr,
+	NULL
+};
-- 
2.25.1