File 0008-librtas-Move-physical-attestation-rtas-call-code-to-.patch of Package librtas
From b213c977f8c5652b89ffe86f5a94d0b94d99a5be Mon Sep 17 00:00:00 2001
From: Haren Myneni <haren@linux.ibm.com>
Date: Sun, 9 Mar 2025 16:29:14 -0700
Subject: [PATCH 8/9] librtas: Move physical-attestation rtas call code to
separate file
New kernel interfaces to support system lockdown will be added for
this RTAS call. So move the physical-attestation rtas call code to
separate file to add code for new interfaces.
Signed-off-by: Haren Myneni <haren@linux.ibm.com>
---
Makefile.am | 3 +-
librtas_src/physical-attestation.c | 78 ++++++++++++++++++++++++++++++
librtas_src/syscall_calls.c | 63 ------------------------
3 files changed, 80 insertions(+), 64 deletions(-)
create mode 100644 librtas_src/physical-attestation.c
diff --git a/Makefile.am b/Makefile.am
index 02d6184..e605d98 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -34,7 +34,8 @@ librtas_la_SOURCES = \
librtas_src/syscall_calls.c \
librtas_src/syscall_rmo.c \
librtas_src/sysparm.c \
- librtas_src/indices.c
+ librtas_src/indices.c \
+ librtas_src/physical-attestation.c
library_include_HEADERS += librtas_src/librtas.h
noinst_HEADERS += \
diff --git a/librtas_src/physical-attestation.c b/librtas_src/physical-attestation.c
new file mode 100644
index 0000000..3e36af3
--- /dev/null
+++ b/librtas_src/physical-attestation.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+// Support for accessing ibm,physical-attestation data
+// via /dev/papr-phy-attestation or the legacy rtas() syscall.
+
+#include <stdarg.h>
+#include <string.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <sys/syscall.h>
+#include <linux/unistd.h>
+#include <linux/types.h>
+#include "internal.h"
+#include "librtas.h"
+
+/**
+ * rtas_physical_attestation
+ * @brief Interface for ibm,physical-attestation rtas call.
+ *
+ * @param workarea input/output work area for rtas call
+ * @param seq_num sequence number of the rtas call
+ * @param next_seq_num next sequence number
+ * @param work_area_bytes size of work area
+ * @return 0 on success, !0 on failure
+ */
+int rtas_physical_attestation(char *workarea, int seq_num, int *next_seq_num,
+ int *work_area_bytes)
+{
+ uint32_t workarea_pa;
+ uint64_t elapsed = 0;
+ void *kernbuf;
+ int kbuf_sz = WORK_AREA_SIZE;
+ int rc, status;
+ int resp_bytes = *work_area_bytes;
+
+ rc = sanity_check();
+ if (rc)
+ return rc;
+
+ /* Caller provided more data than FW can handle */
+ if (*work_area_bytes == 0 ||
+ *work_area_bytes > kbuf_sz)
+ return RTAS_IO_ASSERT;
+
+ rc = rtas_get_rmo_buffer(kbuf_sz, &kernbuf, &workarea_pa);
+ if (rc)
+ return rc;
+ memcpy(kernbuf, workarea, *work_area_bytes);
+
+ do {
+ rc = rtas_call("ibm,physical-attestation", 3, 3,
+ htobe32(workarea_pa), htobe32(kbuf_sz),
+ htobe32(seq_num),
+ &status, next_seq_num, &resp_bytes);
+ if (rc < 0)
+ break;
+
+ rc = handle_delay(status, &elapsed);
+ } while (rc == CALL_AGAIN);
+
+ *next_seq_num = be32toh(*next_seq_num);
+
+ /* FW returned more data than we can handle */
+ if (be32toh(resp_bytes) > (unsigned int)*work_area_bytes) {
+ (void)rtas_free_rmo_buffer(kernbuf, workarea_pa, kbuf_sz);
+ return RTAS_IO_ASSERT;
+ }
+
+ *work_area_bytes = be32toh(resp_bytes);
+
+ if (rc == 0)
+ memcpy(workarea, kernbuf, *work_area_bytes);
+
+ (void)rtas_free_rmo_buffer(kernbuf, workarea_pa, kbuf_sz);
+
+ return rc ? rc : status;
+}
+
diff --git a/librtas_src/syscall_calls.c b/librtas_src/syscall_calls.c
index 573a4c3..c1d3a9c 100644
--- a/librtas_src/syscall_calls.c
+++ b/librtas_src/syscall_calls.c
@@ -990,66 +990,3 @@ int rtas_update_properties(char *workarea, unsigned int scope)
dbg("(%p) %u = %d\n", workarea, scope, rc ? rc : status);
return rc ? rc : status;
}
-
-/**
- * rtas_physical_attestation
- * @brief Interface for ibm,physical-attestation rtas call.
- *
- * @param workarea input/output work area for rtas call
- * @param seq_num sequence number of the rtas call
- * @param next_seq_num next sequence number
- * @param work_area_bytes size of work area
- * @return 0 on success, !0 on failure
- */
-int rtas_physical_attestation(char *workarea, int seq_num, int *next_seq_num,
- int *work_area_bytes)
-{
- uint32_t workarea_pa;
- uint64_t elapsed = 0;
- void *kernbuf;
- int kbuf_sz = WORK_AREA_SIZE;
- int rc, status;
- int resp_bytes = *work_area_bytes;
-
- rc = sanity_check();
- if (rc)
- return rc;
-
- /* Caller provided more data than FW can handle */
- if (*work_area_bytes == 0 ||
- *work_area_bytes > kbuf_sz)
- return RTAS_IO_ASSERT;
-
- rc = rtas_get_rmo_buffer(kbuf_sz, &kernbuf, &workarea_pa);
- if (rc)
- return rc;
- memcpy(kernbuf, workarea, *work_area_bytes);
-
- do {
- rc = rtas_call("ibm,physical-attestation", 3, 3,
- htobe32(workarea_pa), htobe32(kbuf_sz),
- htobe32(seq_num),
- &status, next_seq_num, &resp_bytes);
- if (rc < 0)
- break;
-
- rc = handle_delay(status, &elapsed);
- } while (rc == CALL_AGAIN);
-
- *next_seq_num = be32toh(*next_seq_num);
-
- /* FW returned more data than we can handle */
- if (be32toh(resp_bytes) > (unsigned int)*work_area_bytes) {
- (void)rtas_free_rmo_buffer(kernbuf, workarea_pa, kbuf_sz);
- return RTAS_IO_ASSERT;
- }
-
- *work_area_bytes = be32toh(resp_bytes);
-
- if (rc == 0)
- memcpy(workarea, kernbuf, *work_area_bytes);
-
- (void)rtas_free_rmo_buffer(kernbuf, workarea_pa, kbuf_sz);
-
- return rc ? rc : status;
-}
--
2.47.1
