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From: Alan Carew <alan.carew@intel.com>
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Date: Mon, 22 Sep 2014 19:34:35 +0100
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Subject: [dpdk-dev] [PATCH 06/10] Alternate implementation of librte_power
for VM Power Management(Guest).
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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@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