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powerpc/secvar: Handle max object size in the consumer

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Currently the max object size is handled in the core secvar code with an
entirely OPAL-specific implementation, so create a new max_size() op and
move the existing implementation into the powernv platform.  Should be
no functional change.

Signed-off-by: Russell Currey <ruscur@russell.cc>
Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230210080401.345462-9-ajd@linux.ibm.com
This commit is contained in:
Russell Currey 2023-02-10 19:03:43 +11:00 committed by Michael Ellerman
parent ec2f40bd00
commit e024079440
3 changed files with 26 additions and 14 deletions
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1
arch/powerpc/include/asm/secvar.h
View File

@ -18,6 +18,7 @@ struct secvar_operations {
int (*get_next)(const char *key, u64 *key_len, u64 keybufsize);
int (*set)(const char *key, u64 key_len, u8 *data, u64 data_size);
ssize_t (*format)(char *buf, size_t bufsize);
int (*max_size)(u64 *max_size);
};
#ifdef CONFIG_PPC_SECURE_BOOT

17
arch/powerpc/kernel/secvar-sysfs.c
View File

@ -132,27 +132,16 @@ static struct kobj_type secvar_ktype = {
static int update_kobj_size(void)
{
struct device_node *node;
u64 varsize;
int rc = 0;
int rc = secvar_ops->max_size(&varsize);
node = of_find_compatible_node(NULL, NULL, "ibm,secvar-backend");
if (!of_device_is_available(node)) {
rc = -ENODEV;
goto out;
}
rc = of_property_read_u64(node, "max-var-size", &varsize);
if (rc)
goto out;
return rc;
data_attr.size = varsize;
update_attr.size = varsize;
out:
of_node_put(node);
return rc;
return 0;
}
static int secvar_sysfs_load(void)

22
arch/powerpc/platforms/powernv/opal-secvar.c
View File

@ -122,11 +122,33 @@ static ssize_t opal_secvar_format(char *buf, size_t bufsize)
return rc;
}
static int opal_secvar_max_size(u64 *max_size)
{
int rc;
struct device_node *node;
node = of_find_compatible_node(NULL, NULL, "ibm,secvar-backend");
if (!node)
return -ENODEV;
if (!of_device_is_available(node)) {
rc = -ENODEV;
goto out;
}
rc = of_property_read_u64(node, "max-var-size", max_size);
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,
.max_size = opal_secvar_max_size,
};
static int opal_secvar_probe(struct platform_device *pdev)