[PATCH v2 4/7] powerpc/secvar: Handle format string in the consumer

Russell Currey
2022-12-30T04:22:27Z

The code that handles the format string in secvar-sysfs.c is entirely
OPAL specific, so create a new "format" op in secvar_operations to make
the secvar code more generic. No functional change.

Signed-off-by: Russell Currey <ruscur@russell.cc>
---
arch/powerpc/include/asm/secvar.h | 1 +
arch/powerpc/kernel/secvar-sysfs.c | 21 +---------------
arch/powerpc/platforms/powernv/opal-secvar.c | 25 ++++++++++++++++++++
3 files changed, 27 insertions(+), 20 deletions(-)

diff --git a/arch/powerpc/include/asm/secvar.h b/arch/powerpc/include/asm/secvar.h
index 4cc35b58b986..3b7e5a3625bd 100644
--- a/arch/powerpc/include/asm/secvar.h
+++ b/arch/powerpc/include/asm/secvar.h
@@ -20,6 +20,7 @@ struct secvar_operations {
uint64_t keybufsize);
int (*set)(const char *key, uint64_t key_len, u8 *data,
uint64_t data_size);
+ ssize_t (*format)(char *buf);
};

#ifdef CONFIG_PPC_SECURE_BOOT
diff --git a/arch/powerpc/kernel/secvar-sysfs.c b/arch/powerpc/kernel/secvar-sysfs.c
index 02e9fee1552e..190238f51335 100644
--- a/arch/powerpc/kernel/secvar-sysfs.c
+++ b/arch/powerpc/kernel/secvar-sysfs.c
@@ -21,26 +21,7 @@ static struct kset *secvar_kset;
static ssize_t format_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
- ssize_t rc = 0;
- struct device_node *node;
- const char *format;
-
- node = of_find_compatible_node(NULL, NULL, "ibm,secvar-backend");
- if (!of_device_is_available(node)) {
- rc = -ENODEV;
- goto out;
- }
-
- rc = of_property_read_string(node, "format", &format);
- if (rc)
- goto out;
-
- rc = sysfs_emit(buf, "%s\n", format);
-
-out:
- of_node_put(node);
-
- return rc;
+ return secvar_ops->format(buf);
}

diff --git a/arch/powerpc/platforms/powernv/opal-secvar.c b/arch/powerpc/platforms/powernv/opal-secvar.c
index 14133e120bdd..5e9de06b2533 100644
--- a/arch/powerpc/platforms/powernv/opal-secvar.c
+++ b/arch/powerpc/platforms/powernv/opal-secvar.c
@@ -101,10 +101,35 @@ static int opal_set_variable(const char *key, uint64_t ksize, u8 *data,
return opal_status_to_err(rc);
}

+static ssize_t opal_secvar_format(char *buf)
+{
+ ssize_t rc = 0;
+ struct device_node *node;
+ const char *format;
+
+ node = of_find_compatible_node(NULL, NULL, "ibm,secvar-backend");
+ if (!of_device_is_available(node)) {
+ rc = -ENODEV;
+ goto out;
+ }
+
+ rc = of_property_read_string(node, "format", &format);
+ if (rc)
+ goto out;
+
+ rc = sysfs_emit(buf, "%s\n", format);
+
+out:
+ of_node_put(node);
+
+ return rc;
+}
+
static const struct secvar_operations opal_secvar_ops = {
.get = opal_get_variable,
.get_next = opal_get_next_variable,
.set = opal_set_variable,
+ .format = opal_secvar_format,
};

static int opal_secvar_probe(struct platform_device *pdev)
--
2.38.1