librtas/0008-librtas-Move-physical-attestation-rtas-call-code-to-.patch

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