diff mbox series

[v2,5/7] powerpc/secvar: Handle max object size in the consumer

Message ID 20221230042014.154483-6-ruscur@russell.cc
State New
Headers
Series pseries dynamic secure boot interface using secvar |

Commit Message

Russell Currey Dec. 30, 2022, 4:20 a.m. UTC 
  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>
---
 arch/powerpc/include/asm/secvar.h            |  1 +
 arch/powerpc/kernel/secvar-sysfs.c           | 17 +++--------------
 arch/powerpc/platforms/powernv/opal-secvar.c | 19 +++++++++++++++++++
 3 files changed, 23 insertions(+), 14 deletions(-)

Comments

Andrew Donnellan Jan. 4, 2023, 7:50 a.m. UTC | #1 
On Fri, 2022-12-30 at 15:20 +1100, Russell Currey wrote:
> 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>

LGTM

Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>

> ---
>  arch/powerpc/include/asm/secvar.h            |  1 +
>  arch/powerpc/kernel/secvar-sysfs.c           | 17 +++--------------
>  arch/powerpc/platforms/powernv/opal-secvar.c | 19
> +++++++++++++++++++
>  3 files changed, 23 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/secvar.h
> b/arch/powerpc/include/asm/secvar.h
> index 3b7e5a3625bd..92d2c051918b 100644
> --- a/arch/powerpc/include/asm/secvar.h
> +++ b/arch/powerpc/include/asm/secvar.h
> @@ -21,6 +21,7 @@ struct secvar_operations {
>         int (*set)(const char *key, uint64_t key_len, u8 *data,
>                    uint64_t data_size);
>         ssize_t (*format)(char *buf);
> +       int (*max_size)(uint64_t *max_size);
>  };
>  
>  #ifdef CONFIG_PPC_SECURE_BOOT
> diff --git a/arch/powerpc/kernel/secvar-sysfs.c
> b/arch/powerpc/kernel/secvar-sysfs.c
> index 190238f51335..aa1daec480e1 100644
> --- a/arch/powerpc/kernel/secvar-sysfs.c
> +++ b/arch/powerpc/kernel/secvar-sysfs.c
> @@ -122,27 +122,16 @@ 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)
> diff --git a/arch/powerpc/platforms/powernv/opal-secvar.c
> b/arch/powerpc/platforms/powernv/opal-secvar.c
> index 5e9de06b2533..07260460e966 100644
> --- a/arch/powerpc/platforms/powernv/opal-secvar.c
> +++ b/arch/powerpc/platforms/powernv/opal-secvar.c
> @@ -125,11 +125,30 @@ static ssize_t opal_secvar_format(char *buf)
>         return rc;
>  }
>  
> +static int opal_secvar_max_size(uint64_t *max_size)
> +{
> +       int rc;
> +       struct device_node *node;
> +
> +       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", 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)
diff mbox series

Patch

diff --git a/arch/powerpc/include/asm/secvar.h b/arch/powerpc/include/asm/secvar.h
index 3b7e5a3625bd..92d2c051918b 100644
--- a/arch/powerpc/include/asm/secvar.h
+++ b/arch/powerpc/include/asm/secvar.h
@@ -21,6 +21,7 @@  struct secvar_operations {
 	int (*set)(const char *key, uint64_t key_len, u8 *data,
 		   uint64_t data_size);
 	ssize_t (*format)(char *buf);
+	int (*max_size)(uint64_t *max_size);
 };
 
 #ifdef CONFIG_PPC_SECURE_BOOT
diff --git a/arch/powerpc/kernel/secvar-sysfs.c b/arch/powerpc/kernel/secvar-sysfs.c
index 190238f51335..aa1daec480e1 100644
--- a/arch/powerpc/kernel/secvar-sysfs.c
+++ b/arch/powerpc/kernel/secvar-sysfs.c
@@ -122,27 +122,16 @@  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)
diff --git a/arch/powerpc/platforms/powernv/opal-secvar.c b/arch/powerpc/platforms/powernv/opal-secvar.c
index 5e9de06b2533..07260460e966 100644
--- a/arch/powerpc/platforms/powernv/opal-secvar.c
+++ b/arch/powerpc/platforms/powernv/opal-secvar.c
@@ -125,11 +125,30 @@  static ssize_t opal_secvar_format(char *buf)
 	return rc;
 }
 
+static int opal_secvar_max_size(uint64_t *max_size)
+{
+	int rc;
+	struct device_node *node;
+
+	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", 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)