This separates out the old tpm_buf_... handling functions from static
inlines in tpm.h and makes them their own tpm-buf.c file. This is a
precursor so we can add new functions for other TPM type handling
Signed-off-by: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
---
v2: added this patch to separate out the API changes
v3: added tpm_buf_reset_cmd()
v6: extract first then add functions
---
drivers/char/tpm/Makefile | 1 +
drivers/char/tpm/tpm-buf.c | 118 +++++++++++++++++++++++++++++++++++++++++++++
drivers/char/tpm/tpm.h | 90 ++++------------------------------
3 files changed, 129 insertions(+), 80 deletions(-)
create mode 100644 drivers/char/tpm/tpm-buf.c
diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
index a01c4cab902a..78bd025b808a 100644
--- a/drivers/char/tpm/Makefile
+++ b/drivers/char/tpm/Makefile
@@ -15,6 +15,7 @@ tpm-y += tpm-sysfs.o
tpm-y += eventlog/common.o
tpm-y += eventlog/tpm1.o
tpm-y += eventlog/tpm2.o
+tpm-y += tpm-buf.o
tpm-$(CONFIG_ACPI) += tpm_ppi.o eventlog/acpi.o
tpm-$(CONFIG_EFI) += eventlog/efi.o
diff --git a/drivers/char/tpm/tpm-buf.c b/drivers/char/tpm/tpm-buf.c
new file mode 100644
index 000000000000..9fa8a9cb0fdf
--- /dev/null
+++ b/drivers/char/tpm/tpm-buf.c
@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Handing for tpm_buf structures to facilitate the building of commands
+ */
+
+#include "tpm.h"
+
+#include <linux/module.h>
+
+static int __tpm_buf_init(struct tpm_buf *buf)
+{
+ buf->data_page = alloc_page(GFP_HIGHUSER);
+ if (!buf->data_page)
+ return -ENOMEM;
+
+ buf->flags = 0;
+ buf->data = kmap(buf->data_page);
+
+ return 0;
+}
+
+void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal)
+{
+ struct tpm_header *head;
+
+ head = (struct tpm_header *) buf->data;
+
+ head->tag = cpu_to_be16(tag);
+ head->length = cpu_to_be32(sizeof(*head));
+ head->ordinal = cpu_to_be32(ordinal);
+}
+EXPORT_SYMBOL_GPL(tpm_buf_reset);
+
+int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal)
+{
+ int rc;
+
+ rc = __tpm_buf_init(buf);
+ if (rc)
+ return rc;
+
+ tpm_buf_reset(buf, tag, ordinal);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(tpm_buf_init);
+
+void tpm_buf_destroy(struct tpm_buf *buf)
+{
+ kunmap(buf->data_page);
+ __free_page(buf->data_page);
+}
+EXPORT_SYMBOL_GPL(tpm_buf_destroy);
+
+u32 tpm_buf_length(struct tpm_buf *buf)
+{
+ struct tpm_header *head = (struct tpm_header *)buf->data;
+ u32 len;
+
+ len = be32_to_cpu(head->length);
+ if (buf->flags & TPM_BUF_2B)
+ len -= sizeof(*head);
+ return len;
+}
+EXPORT_SYMBOL_GPL(tpm_buf_length);
+
+u16 tpm_buf_tag(struct tpm_buf *buf)
+{
+ struct tpm_header *head = (struct tpm_header *)buf->data;
+
+ return be16_to_cpu(head->tag);
+}
+EXPORT_SYMBOL_GPL(tpm_buf_tag);
+
+void tpm_buf_append(struct tpm_buf *buf,
+ const unsigned char *new_data,
+ unsigned int new_len)
+{
+ struct tpm_header *head = (struct tpm_header *) buf->data;
+ u32 len = be32_to_cpu(head->length);
+
+ /* Return silently if overflow has already happened. */
+ if (buf->flags & TPM_BUF_OVERFLOW)
+ return;
+
+ if ((len + new_len) > PAGE_SIZE) {
+ WARN(1, "tpm_buf: overflow\n");
+ buf->flags |= TPM_BUF_OVERFLOW;
+ return;
+ }
+
+ memcpy(&buf->data[len], new_data, new_len);
+ head->length = cpu_to_be32(len + new_len);
+}
+EXPORT_SYMBOL_GPL(tpm_buf_append);
+
+void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value)
+{
+ tpm_buf_append(buf, &value, 1);
+}
+EXPORT_SYMBOL_GPL(tpm_buf_append_u8);
+
+void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value)
+{
+ __be16 value2 = cpu_to_be16(value);
+
+ tpm_buf_append(buf, (u8 *) &value2, 2);
+}
+EXPORT_SYMBOL_GPL(tpm_buf_append_u16);
+
+void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value)
+{
+ __be32 value2 = cpu_to_be32(value);
+
+ tpm_buf_append(buf, (u8 *) &value2, 4);
+}
+EXPORT_SYMBOL_GPL(tpm_buf_append_u32);
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index a7fea3e0ca86..8c5b8bba60d2 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -281,6 +281,7 @@ enum tpm_sub_capabilities {
enum tpm_buf_flags {
TPM_BUF_OVERFLOW = BIT(0),
+ TPM_BUF_2B = BIT(1),
};
struct tpm_buf {
@@ -289,86 +290,15 @@ struct tpm_buf {
u8 *data;
};
-static inline void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal)
-{
- struct tpm_header *head = (struct tpm_header *)buf->data;
-
- head->tag = cpu_to_be16(tag);
- head->length = cpu_to_be32(sizeof(*head));
- head->ordinal = cpu_to_be32(ordinal);
-}
-
-static inline int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal)
-{
- buf->data_page = alloc_page(GFP_HIGHUSER);
- if (!buf->data_page)
- return -ENOMEM;
-
- buf->flags = 0;
- buf->data = kmap(buf->data_page);
- tpm_buf_reset(buf, tag, ordinal);
- return 0;
-}
-
-static inline void tpm_buf_destroy(struct tpm_buf *buf)
-{
- kunmap(buf->data_page);
- __free_page(buf->data_page);
-}
-
-static inline u32 tpm_buf_length(struct tpm_buf *buf)
-{
- struct tpm_header *head = (struct tpm_header *)buf->data;
-
- return be32_to_cpu(head->length);
-}
-
-static inline u16 tpm_buf_tag(struct tpm_buf *buf)
-{
- struct tpm_header *head = (struct tpm_header *)buf->data;
-
- return be16_to_cpu(head->tag);
-}
-
-static inline void tpm_buf_append(struct tpm_buf *buf,
- const unsigned char *new_data,
- unsigned int new_len)
-{
- struct tpm_header *head = (struct tpm_header *)buf->data;
- u32 len = tpm_buf_length(buf);
-
- /* Return silently if overflow has already happened. */
- if (buf->flags & TPM_BUF_OVERFLOW)
- return;
-
- if ((len + new_len) > PAGE_SIZE) {
- WARN(1, "tpm_buf: overflow\n");
- buf->flags |= TPM_BUF_OVERFLOW;
- return;
- }
-
- memcpy(&buf->data[len], new_data, new_len);
- head->length = cpu_to_be32(len + new_len);
-}
-
-static inline void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value)
-{
- tpm_buf_append(buf, &value, 1);
-}
-
-static inline void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value)
-{
- __be16 value2 = cpu_to_be16(value);
-
- tpm_buf_append(buf, (u8 *) &value2, 2);
-}
-
-static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value)
-{
- __be32 value2 = cpu_to_be32(value);
-
- tpm_buf_append(buf, (u8 *) &value2, 4);
-}
+int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal);
+void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal);
+void tpm_buf_destroy(struct tpm_buf *buf);
+u32 tpm_buf_length(struct tpm_buf *buf);
+void tpm_buf_append(struct tpm_buf *buf, const unsigned char *new_data,
+ unsigned int new_len);
+void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value);
+void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value);
+void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value);
extern struct class *tpm_class;
extern struct class *tpmrm_class;
--
2.16.4
