4 * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * * Neither the name of Intel Corporation nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 #ifndef CHANNEL_MANAGER_H_
35 #define CHANNEL_MANAGER_H_
41 #include <linux/limits.h>
43 #include <rte_atomic.h>
45 /* Maximum number of CPUs */
46 #define CHANNEL_CMDS_MAX_CPUS 64
47 #if CHANNEL_CMDS_MAX_CPUS > 64
48 #error Maximum number of cores is 64, overflow is guaranteed to \
49 cause problems with VM Power Management
52 /* Maximum name length including '\0' terminator */
53 #define CHANNEL_MGR_MAX_NAME_LEN 64
55 /* Maximum number of channels to each Virtual Machine */
56 #define CHANNEL_MGR_MAX_CHANNELS 64
58 /* Hypervisor Path for libvirt(qemu/KVM) */
59 #define CHANNEL_MGR_DEFAULT_HV_PATH "qemu:///system"
61 /* File socket directory */
62 #define CHANNEL_MGR_SOCKET_PATH "/tmp/powermonitor/"
65 struct sockaddr_un _sockaddr_un;
66 #define UNIX_PATH_MAX sizeof(_sockaddr_un.sun_path)
73 struct libvirt_vm_info {
75 unsigned int pcpus[MAX_VCPUS];
79 struct libvirt_vm_info lvm_info[MAX_VMS];
80 /* Communication Channel Status */
81 enum channel_status { CHANNEL_MGR_CHANNEL_DISCONNECTED = 0,
82 CHANNEL_MGR_CHANNEL_CONNECTED,
83 CHANNEL_MGR_CHANNEL_DISABLED,
84 CHANNEL_MGR_CHANNEL_PROCESSING};
86 /* VM libvirt(qemu/KVM) connection status */
87 enum vm_status { CHANNEL_MGR_VM_INACTIVE = 0, CHANNEL_MGR_VM_ACTIVE};
90 * Represents a single and exclusive VM channel that exists between a guest and
94 char channel_path[UNIX_PATH_MAX]; /**< Path to host socket */
95 volatile uint32_t status; /**< Connection status(enum channel_status) */
96 int fd; /**< AF_UNIX socket fd */
97 unsigned channel_num; /**< CHANNEL_MGR_SOCKET_PATH/<vm_name>.channel_num */
98 void *priv_info; /**< Pointer to private info, do not modify */
101 /* Represents a single VM instance used to return internal information about
104 char name[CHANNEL_MGR_MAX_NAME_LEN]; /**< VM name */
105 enum vm_status status; /**< libvirt status */
106 uint64_t pcpu_mask[CHANNEL_CMDS_MAX_CPUS]; /**< pCPU mask for each vCPU */
107 unsigned num_vcpus; /**< number of vCPUS */
108 struct channel_info channels[CHANNEL_MGR_MAX_CHANNELS]; /**< Array of channel_info */
109 unsigned num_channels; /**< Number of channels */
113 * Initialize the Channel Manager resources and connect to the Hypervisor
115 * This must be successfully called first before calling any other functions.
116 * It must only be call once;
119 * Must be a local path, e.g. qemu:///system.
123 * - Negative on error.
125 int channel_manager_init(const char *path);
128 * Free resources associated with the Channel Manager.
131 * Must be a local path, e.g. qemu:///system.
136 void channel_manager_exit(void);
139 * Get the Physical CPU mask for VM lcore channel(vcpu), result is assigned to
141 * It is not thread-safe.
144 * Pointer to struct channel_info
147 * The virtual CPU to query.
154 uint64_t get_pcpus_mask(struct channel_info *chan_info, unsigned vcpu);
157 * Set the Physical CPU mask for the specified vCPU.
158 * It is not thread-safe.
161 * Virtual Machine name to lookup
164 * The virtual CPU to set.
167 * The core mask of the physical CPU(s) to bind the vCPU
171 * - Negative on error.
173 int set_pcpus_mask(char *vm_name, unsigned vcpu, uint64_t core_mask);
176 * Set the Physical CPU for the specified vCPU.
177 * It is not thread-safe.
180 * Virtual Machine name to lookup
183 * The virtual CPU to set.
186 * The core number of the physical CPU(s) to bind the vCPU
190 * - Negative on error.
192 int set_pcpu(char *vm_name, unsigned vcpu, unsigned core_num);
194 * Add a VM as specified by name to the Channel Manager. The name must
195 * correspond to a valid libvirt domain name.
196 * This is required prior to adding channels.
197 * It is not thread-safe.
200 * Virtual Machine name to lookup.
204 * - Negative on error.
206 int add_vm(const char *name);
209 * Remove a previously added Virtual Machine from the Channel Manager
210 * It is not thread-safe.
213 * Virtual Machine name to lookup.
217 * - Negative on error.
219 int remove_vm(const char *name);
222 * Add all available channels to the VM as specified by name.
223 * Channels in the form of paths
224 * (CHANNEL_MGR_SOCKET_PATH/<vm_name>.<channel_number>) will only be parsed.
225 * It is not thread-safe.
228 * Virtual Machine name to lookup.
231 * - N the number of channels added for the VM
233 int add_all_channels(const char *vm_name);
236 * Add the channel numbers in channel_list to the domain specified by name.
237 * Channels in the form of paths
238 * (CHANNEL_MGR_SOCKET_PATH/<vm_name>.<channel_number>) will only be parsed.
239 * It is not thread-safe.
242 * Virtual Machine name to add channels.
244 * @param channel_list
245 * Pointer to list of unsigned integers, representing the channel number to add
246 * It must be allocated outside of this function.
248 * @param num_channels
249 * The amount of channel numbers in channel_list
252 * - N the number of channels added for the VM
255 int add_channels(const char *vm_name, unsigned *channel_list,
256 unsigned num_channels);
259 * Remove a channel definition from the channel manager. This must only be
260 * called from the channel monitor thread.
263 * Pointer to a valid struct channel_info.
267 * - Negative on error.
269 int remove_channel(struct channel_info **chan_info_dptr);
272 * For all channels associated with a Virtual Machine name, update the
273 * connection status. Valid states are CHANNEL_MGR_CHANNEL_CONNECTED or
274 * CHANNEL_MGR_CHANNEL_DISABLED only.
278 * Virtual Machine name to modify all channels.
281 * The status to set each channel
283 * @param num_channels
284 * The amount of channel numbers in channel_list
287 * - N the number of channels added for the VM
290 int set_channel_status_all(const char *name, enum channel_status status);
293 * For all channels in channel_list associated with a Virtual Machine name
294 * update the connection status of each.
295 * Valid states are CHANNEL_MGR_CHANNEL_CONNECTED or
296 * CHANNEL_MGR_CHANNEL_DISABLED only.
297 * It is not thread-safe.
300 * Virtual Machine name to add channels.
302 * @param channel_list
303 * Pointer to list of unsigned integers, representing the channel numbers to
305 * It must be allocated outside of this function.
307 * @param num_channels
308 * The amount of channel numbers in channel_list
311 * - N the number of channels modified for the VM
314 int set_channel_status(const char *vm_name, unsigned *channel_list,
315 unsigned len_channel_list, enum channel_status status);
318 * Populates a pointer to struct vm_info associated with vm_name.
321 * The name of the virtual machine to lookup.
324 * Pointer to a struct vm_info, this must be allocated prior to calling this
329 * - Negative on error.
331 int get_info_vm(const char *vm_name, struct vm_info *info);
334 * Populates a table with all domains running and their physical cpu.
335 * All information is gathered through libvirt api.
338 * modified to store number of active VMs
341 modified to store number of vcpus active
346 void get_all_vm(int *num_vm, int *num_vcpu);
351 #endif /* CHANNEL_MANAGER_H_ */