Patch rework based on feedback, only x86 specific functions left under
lib/librte_eal/common/include/arch/x86/.
Signed-off-by: Wojciech Andralojc <wojciechx.andralojc at intel.com>
---
lib/librte_eal/common/include/arch/x86/rte_msr.h | 158 +++++++++++++++++++++++
1 file changed, 158 insertions(+)
create mode 100644 lib/librte_eal/common/include/arch/x86/rte_msr.h
diff --git a/lib/librte_eal/common/include/arch/x86/rte_msr.h
b/lib/librte_eal/common/include/arch/x86/rte_msr.h
new file mode 100644
index 0000000..9d16633
--- /dev/null
+++ b/lib/librte_eal/common/include/arch/x86/rte_msr.h
@@ -0,0 +1,158 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2016 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _RTE_MSR_X86_64_H_
+#define _RTE_MSR_X86_64_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <fcntl.h> //O_RDONLY
+#include <unistd.h> //pread
+
+#include <rte_debug.h>
+#include <rte_log.h>
+
+#define CPU_MSR_PATH "/dev/cpu/%u/msr"
+#define CPU_MSR_PATH_MAX_LEN 32
+
+/**
+ * This function should not be called directly.
+ * Function to open CPU's MSR file
+ */
+static int
+__msr_open_file(const unsigned lcore, int flags)
+{
+ char fname[CPU_MSR_PATH_MAX_LEN] = {0};
+ int fd = -1;
+
+ snprintf(fname, sizeof(fname) - 1, CPU_MSR_PATH, lcore);
+
+ fd = open(fname, flags);
+
+ if (fd < 0)
+ RTE_LOG(ERR, PQOS, "Error opening file '%s'!\n", fname);
+
+ return fd;
+}
+
+/**
+ * Function to read CPU's MSR
+ *
+ * @param [in] lcore
+ * CPU logical core id
+ *
+ * @param [in] reg
+ * MSR reg to read
+ *
+ * @param [out] value
+ * Read value of MSR reg
+ *
+ * @return
+ * Operations status
+*/
+
+static inline int
+rte_msr_read(const unsigned lcore, const uint32_t reg, uint64_t *value)
+{
+ int fd = -1;
+ int ret = -1;
+
+ RTE_VERIFY(value != NULL);
+ if (value == NULL)
+ return -1;
+
+ fd = __msr_open_file(lcore, O_RDONLY);
+
+ if (fd >= 0) {
+ ssize_t read_ret = 0;
+
+ read_ret = pread(fd, value, sizeof(value[0]), (off_t)reg);
+
+ if (read_ret != sizeof(value[0])) {
+ RTE_LOG(ERR, PQOS, "RDMSR failed for reg[0x%x] on lcore
%u\n",
+ (unsigned)reg, lcore);
+ } else
+ ret = 0;
+
+ close(fd);
+ }
+
+ return ret;
+}
+
+/**
+ * Function to write CPU's MSR
+ *
+ * @param [in] lcore
+ * CPU logical core id
+ *
+ * @param [in] reg
+ * MSR reg to write
+ *
+ * @param [in] value
+ * Value to be written to MSR reg
+ *
+ * @return
+ * Operations status
+*/
+static inline int
+rte_msr_write(const unsigned lcore, const uint32_t reg, const uint64_t value)
+{
+ int fd = -1;
+ int ret = -1;
+
+ fd = __msr_open_file(lcore, O_WRONLY);
+
+ if (fd >= 0) {
+ ssize_t write_ret = 0;
+
+ write_ret = pwrite(fd, &value, sizeof(value), (off_t)reg);
+ if (write_ret != sizeof(value)) {
+ RTE_LOG(ERR, PQOS, "WRMSR failed for reg[0x%x] <-
value[0x%llx] on "
+ "lcore %u\n", (unsigned)reg, (unsigned
long long)value, lcore);
+ } else
+ ret = 0;
+
+ close(fd);
+ }
+
+ return ret;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_MSR_X86_64_H_ */
--
1.9.3
