[dpdk-dev] [PATCH 06/10] Alternate implementation of librte_power for VM Power Management(Guest).

[Alan Carew]

Re-using the host based librte_power API the alternate implementation uses
the guest channel API to forward request for frequency changes to the host
monitor.
A subset of the librte_power API is supported:
 rte_power_init(unsigned lcore_id)
 rte_power_exit(unsigned lcore_id)
 rte_power_freq_up(unsigned lcore_id)
 rte_power_freq_down(unsigned lcore_id)
 rte_power_freq_min(unsigned lcore_id)
 rte_power_freq_max(unsigned lcore_id)

The other unsupported APIs from librte_power return -ENOTSUP.

Signed-off-by: Alan Carew <alan.carew at intel.com>
---
 lib/librte_power_vm/Makefile    |  49 ++++++++++++++
 lib/librte_power_vm/rte_power.c | 146 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 195 insertions(+)
 create mode 100644 lib/librte_power_vm/Makefile
 create mode 100644 lib/librte_power_vm/rte_power.c

diff --git a/lib/librte_power_vm/Makefile b/lib/librte_power_vm/Makefile
new file mode 100644
index 0000000..284ec2c
--- /dev/null
+++ b/lib/librte_power_vm/Makefile
@@ -0,0 +1,49 @@
+#   BSD LICENSE
+#
+#   Copyright(c) 2010-2014 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.
+
+include $(RTE_SDK)/mk/rte.vars.mk
+
+# library name
+LIB = librte_power.a
+
+CFLAGS += $(WERROR_FLAGS) -I$(SRCDIR) -O3 -fno-strict-aliasing
+CFLAGS += -I$(RTE_SDK)/lib/librte_power/
+
+# all source are stored in SRCS-y
+SRCS-$(CONFIG_RTE_LIBRTE_POWER_VM) := guest_channel.c rte_power.c
+
+# install this header file
+SYMLINK-y-include := ../librte_power/rte_power.h
+
+# this lib needs eal
+DEPDIRS-$(CONFIG_RTE_LIBRTE_POWER) += lib/librte_eal
+
+include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/lib/librte_power_vm/rte_power.c b/lib/librte_power_vm/rte_power.c
new file mode 100644
index 0000000..1ce3fb0
--- /dev/null
+++ b/lib/librte_power_vm/rte_power.c
@@ -0,0 +1,146 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 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.
+ */
+#include <errno.h>
+#include <string.h>
+
+#include <rte_log.h>
+#include <rte_config.h>
+
+#include "guest_channel.h"
+#include "channel_commands.h"
+#include "rte_power.h"
+
+#define RTE_LOGTYPE_POWER_VM RTE_LOGTYPE_USER1
+
+#define FD_PATH "/dev/virtio-ports/virtio.serial.port.poweragent"
+
+static struct channel_packet pkt[RTE_MAX_LCORE];
+
+
+int
+rte_power_init(unsigned lcore_id)
+{
+	pkt[lcore_id].command = CPU_POWER;
+	pkt[lcore_id].resource_id = lcore_id;
+	return guest_channel_host_connect(FD_PATH, lcore_id);
+}
+
+int
+rte_power_exit(unsigned lcore_id)
+{
+	guest_channel_host_disconnect(lcore_id);
+	return 0;
+}
+
+uint32_t
+rte_power_freqs(__attribute__((unused)) unsigned lcore_id,
+		__attribute__((unused)) uint32_t *freqs,
+		__attribute__((unused)) uint32_t num)
+{
+	RTE_LOG(ERR, POWER_VM, "rte_power_freqs is not implemented "
+			"for Virtual Machine Power Management\n");
+	return -ENOTSUP;
+}
+
+uint32_t
+rte_power_get_freq(__attribute__((unused)) unsigned lcore_id)
+{
+	RTE_LOG(ERR, POWER_VM, "rte_power_get_freq is not implemented "
+			"for Virtual Machine Power Management\n");
+	return -ENOTSUP;
+}
+
+int
+rte_power_set_freq(__attribute__((unused)) unsigned lcore_id,
+		__attribute__((unused)) uint32_t index)
+{
+	RTE_LOG(ERR, POWER_VM, "rte_power_set_freq is not implemented "
+			"for Virtual Machine Power Management\n");
+	return -ENOTSUP;
+}
+
+int
+rte_power_freq_up(unsigned lcore_id)
+{
+	int ret;
+	pkt[lcore_id].unit = CPU_SCALE_UP;
+
+	ret = guest_channel_send_msg(&pkt[lcore_id], lcore_id);
+	if (ret <= 0)
+		return ret;
+	if (ret > 0)
+		RTE_LOG(DEBUG, POWER_VM, "Error sending message: %s\n", strerror(ret));
+	return -1;
+}
+
+int
+rte_power_freq_down(__attribute__((unused)) unsigned lcore_id)
+{
+	int ret;
+	pkt[lcore_id].unit = CPU_SCALE_DOWN;
+
+	ret = guest_channel_send_msg(&pkt[lcore_id], lcore_id);
+	if (ret <= 0)
+		return ret;
+	if (ret > 0)
+		RTE_LOG(DEBUG, POWER_VM, "Error sending message: %s\n", strerror(ret));
+	return -1;
+}
+
+int
+rte_power_freq_max(__attribute__((unused)) unsigned lcore_id)
+{
+	int ret;
+	pkt[lcore_id].unit = CPU_SCALE_MAX;
+
+	ret = guest_channel_send_msg(&pkt[lcore_id], lcore_id);
+	if (ret <= 0)
+		return ret;
+	if (ret > 0)
+		RTE_LOG(DEBUG, POWER_VM, "Error sending message: %s\n", strerror(ret));
+	return -1;
+}
+
+int
+rte_power_freq_min(__attribute__((unused)) unsigned lcore_id)
+{
+	int ret;
+	pkt[lcore_id].unit = CPU_SCALE_MIN;
+
+	ret = guest_channel_send_msg(&pkt[lcore_id], lcore_id);
+	if (ret <= 0)
+		return ret;
+	if (ret > 0)
+		RTE_LOG(DEBUG, POWER_VM, "Error sending message: %s\n", strerror(ret));
+	return -1;
+}
-- 
1.9.3