drivers/xen/pcpu.c

2  * pcpu.c
3  * Management physical cpu in dom0, get pcpu info and provide sys interface
60 struct pcpu {
103 	struct pcpu *cpu = container_of(dev, struct pcpu, dev);
112 	struct pcpu *pcpu = container_of(dev, struct pcpu, dev);
124 		ret = xen_pcpu_down(pcpu->cpu_id);
127 		ret = xen_pcpu_up(pcpu->cpu_id);
172 			       struct pcpu *pcpu)
175 	   !xen_pcpu_online(pcpu->flags)) {
176 		/* the pcpu is onlined */
177 		pcpu->flags |= XEN_PCPU_FLAGS_ONLINE;
178 		kobject_uevent(&pcpu->dev.kobj, KOBJ_ONLINE);
180 		    xen_pcpu_online(pcpu->flags)) {
181 		/* The pcpu is offlined */
182 		pcpu->flags &= ~XEN_PCPU_FLAGS_ONLINE;
183 		kobject_uevent(&pcpu->dev.kobj, KOBJ_OFFLINE);
187 static struct pcpu *get_pcpu(uint32_t cpu_id)
189 	struct pcpu *pcpu;
191 	list_for_each_entry(pcpu, &xen_pcpus, list) {
192 		if (pcpu->cpu_id == cpu_id)
193 			return pcpu;
201 	struct pcpu *pcpu = container_of(dev, struct pcpu, dev);
203 	list_del(&pcpu->list);
204 	kfree(pcpu);
207 static void unregister_and_remove_pcpu(struct pcpu *pcpu)
211 	if (!pcpu)
214 	dev = &pcpu->dev;
215 	/* pcpu remove would be implicitly done */
219 static int register_pcpu(struct pcpu *pcpu)
224 	if (!pcpu)
227 	dev = &pcpu->dev;
229 	dev->id = pcpu->cpu_id;
242 static struct pcpu *create_and_register_pcpu(struct xenpf_pcpuinfo *info)
244 	struct pcpu *pcpu;
250 	pcpu = kzalloc(sizeof(struct pcpu), GFP_KERNEL);
251 	if (!pcpu)
254 	INIT_LIST_HEAD(&pcpu->list);
255 	pcpu->cpu_id = info->xen_cpuid;
256 	pcpu->acpi_id = info->acpi_id;
257 	pcpu->flags = info->flags;
259 	/* Need hold on xen_pcpu_lock before pcpu list manipulations */
260 	list_add_tail(&pcpu->list, &xen_pcpus);
262 	err = register_pcpu(pcpu);
264 		pr_warn("Failed to register pcpu%u\n", info->xen_cpuid);
268 	return pcpu;
277 	struct pcpu *pcpu = NULL;
293 	pcpu = get_pcpu(cpu);
299 		unregister_and_remove_pcpu(pcpu);
303 	if (!pcpu) {
304 		pcpu = create_and_register_pcpu(info);
305 		if (IS_ERR_OR_NULL(pcpu))
308 		pcpu_online_status(info, pcpu);
314  * Sync dom0's pcpu information with xen hypervisor's
323 	struct pcpu *pcpu, *tmp;
333 		list_for_each_entry_safe(pcpu, tmp, &xen_pcpus, list)
334 			unregister_and_remove_pcpu(pcpu);
362 				      "xen-pcpu", NULL);
364 		pr_warn("Failed to bind pcpu virq\n");
370 		pr_warn("Failed to register pcpu subsys\n");
376 		pr_warn("Failed to sync pcpu info\n");
393 	const struct pcpu *pcpu;
397 	list_for_each_entry(pcpu, &xen_pcpus, list)
398 		if (pcpu->acpi_id == acpi_id) {
399 			online = pcpu->flags & XEN_PCPU_FLAGS_ONLINE;