File 0002-librtas-move-VPD-code-into-separate-module.patch of Package librtas
From ee06898b1e7807a6e201b281ffc8ee3fa96136f4 Mon Sep 17 00:00:00 2001
From: Nathan Lynch <nathanl@linux.ibm.com>
Date: Sat, 12 Aug 2023 12:44:38 -0500
Subject: [PATCH 2/6] librtas: move VPD code into separate module
This code will gain the ability to retrieve VPD using a different
interface exposed by newer kernels. This will be a lot of additional
code, so move it out of syscall_calls.c.
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
---
Makefile.am | 1 +
librtas_src/syscall_calls.c | 67 ------------------------------
librtas_src/vpd.c | 81 +++++++++++++++++++++++++++++++++++++
3 files changed, 82 insertions(+), 67 deletions(-)
create mode 100644 librtas_src/vpd.c
diff --git a/Makefile.am b/Makefile.am
index c4bf09d..37df243 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -28,6 +28,7 @@ LIBRTAS_LIBRARY_VERSION = $(LIBRTAS_CURRENT):$(LIBRTAS_REVISION):$(LIBRTAS_AGE)
lib_LTLIBRARIES += librtas.la
librtas_la_LDFLAGS = -version-info $(LIBRTAS_LIBRARY_VERSION)
librtas_la_SOURCES = \
+ librtas_src/vpd.c \
librtas_src/ofdt.c \
librtas_src/syscall_calls.c \
librtas_src/syscall_rmo.c
diff --git a/librtas_src/syscall_calls.c b/librtas_src/syscall_calls.c
index eabc5ea..05f3c7c 100644
--- a/librtas_src/syscall_calls.c
+++ b/librtas_src/syscall_calls.c
@@ -753,73 +753,6 @@ int rtas_get_time(uint32_t *year, uint32_t *month, uint32_t *day,
return rc ? rc : status;
}
-/**
- * rtas_get_vpd
- * @brief Interface to the ibm,get-vpd rtas call
- *
- * @param loc_code location code
- * @param workarea additional args to rtas call
- * @param size
- * @param sequence
- * @param seq_next
- * @param bytes_ret
- * @return 0 on success, !0 otherwise
- */
-int rtas_get_vpd(char *loc_code, char *workarea, size_t size,
- unsigned int sequence, unsigned int *seq_next,
- unsigned int *bytes_ret)
-{
- uint32_t kernbuf_pa;
- uint32_t loc_pa = 0;
- uint32_t rmo_pa = 0;
- uint64_t elapsed = 0;
- void *kernbuf;
- void *rmobuf;
- void *locbuf;
- int rc, status;
-
- rc = sanity_check();
- if (rc)
- return rc;
-
- rc = rtas_get_rmo_buffer(size + WORK_AREA_SIZE, &rmobuf, &rmo_pa);
- if (rc)
- return rc;
-
- kernbuf = rmobuf + WORK_AREA_SIZE;
- kernbuf_pa = rmo_pa + WORK_AREA_SIZE;
- locbuf = rmobuf;
- loc_pa = rmo_pa;
-
- /* If user didn't set loc_code, copy a NULL string */
- strncpy(locbuf, loc_code ? loc_code : "", WORK_AREA_SIZE);
-
- *seq_next = htobe32(sequence);
- do {
- sequence = *seq_next;
- rc = rtas_call_no_delay("ibm,get-vpd", 4, 3, htobe32(loc_pa),
- htobe32(kernbuf_pa), htobe32(size),
- sequence, &status, seq_next,
- bytes_ret);
- if (rc < 0)
- break;
-
- rc = handle_delay(status, &elapsed);
- } while (rc == CALL_AGAIN);
-
- if (rc == 0)
- memcpy(workarea, kernbuf, size);
-
- (void) rtas_free_rmo_buffer(rmobuf, rmo_pa, size + WORK_AREA_SIZE);
-
- *seq_next = be32toh(*seq_next);
- *bytes_ret = be32toh(*bytes_ret);
-
- dbg("(%s, 0x%p, %zu, %u) = %d, %u, %u\n", loc_code ? loc_code : "NULL",
- workarea, size, sequence, status, *seq_next, *bytes_ret);
- return rc ? rc : status;
-}
-
/**
* rtas_lpar_perftools
* @brief Interface to the ibm,lpar-perftools rtas call
diff --git a/librtas_src/vpd.c b/librtas_src/vpd.c
new file mode 100644
index 0000000..b2689fb
--- /dev/null
+++ b/librtas_src/vpd.c
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+// Support for accessing IBM Power systems Vital Product Data (VPD)
+// via the rtas() syscall.
+
+#include <endian.h>
+#include <linux/types.h>
+#include <linux/unistd.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/syscall.h>
+
+#include "internal.h"
+#include "librtas.h"
+
+/**
+ * rtas_get_vpd
+ * @brief Interface to the ibm,get-vpd rtas call
+ *
+ * @param loc_code location code
+ * @param workarea additional args to rtas call
+ * @param size
+ * @param sequence
+ * @param seq_next
+ * @param bytes_ret
+ * @return 0 on success, !0 otherwise
+ */
+int rtas_get_vpd(char *loc_code, char *workarea, size_t size,
+ unsigned int sequence, unsigned int *seq_next,
+ unsigned int *bytes_ret)
+{
+ uint32_t kernbuf_pa;
+ uint32_t loc_pa = 0;
+ uint32_t rmo_pa = 0;
+ uint64_t elapsed = 0;
+ void *kernbuf;
+ void *rmobuf;
+ void *locbuf;
+ int rc, status;
+
+ rc = sanity_check();
+ if (rc)
+ return rc;
+
+ rc = rtas_get_rmo_buffer(size + WORK_AREA_SIZE, &rmobuf, &rmo_pa);
+ if (rc)
+ return rc;
+
+ kernbuf = rmobuf + WORK_AREA_SIZE;
+ kernbuf_pa = rmo_pa + WORK_AREA_SIZE;
+ locbuf = rmobuf;
+ loc_pa = rmo_pa;
+
+ /* If user didn't set loc_code, copy a NULL string */
+ strncpy(locbuf, loc_code ? loc_code : "", WORK_AREA_SIZE);
+
+ *seq_next = htobe32(sequence);
+ do {
+ sequence = *seq_next;
+ rc = rtas_call_no_delay("ibm,get-vpd", 4, 3, htobe32(loc_pa),
+ htobe32(kernbuf_pa), htobe32(size),
+ sequence, &status, seq_next,
+ bytes_ret);
+ if (rc < 0)
+ break;
+
+ rc = handle_delay(status, &elapsed);
+ } while (rc == CALL_AGAIN);
+
+ if (rc == 0)
+ memcpy(workarea, kernbuf, size);
+
+ (void) rtas_free_rmo_buffer(rmobuf, rmo_pa, size + WORK_AREA_SIZE);
+
+ *seq_next = be32toh(*seq_next);
+ *bytes_ret = be32toh(*bytes_ret);
+
+ dbg("(%s, 0x%p, %zu, %u) = %d, %u, %u\n", loc_code ? loc_code : "NULL",
+ workarea, size, sequence, status, *seq_next, *bytes_ret);
+ return rc ? rc : status;
+}
--
2.43.0
