2 #include <xen/events.h>
3 #include <xen/grant_table.h>
5 #include <xen/interface/vcpu.h>
6 #include <xen/interface/xen.h>
7 #include <xen/interface/memory.h>
8 #include <xen/interface/hvm/params.h>
9 #include <xen/features.h>
10 #include <xen/platform_pci.h>
11 #include <xen/xenbus.h>
13 #include <xen/interface/sched.h>
14 #include <xen/xen-ops.h>
15 #include <asm/xen/hypervisor.h>
16 #include <asm/xen/hypercall.h>
17 #include <asm/system_misc.h>
18 #include <linux/interrupt.h>
19 #include <linux/irqreturn.h>
20 #include <linux/module.h>
22 #include <linux/of_irq.h>
23 #include <linux/of_address.h>
24 #include <linux/cpuidle.h>
25 #include <linux/cpufreq.h>
26 #include <linux/cpu.h>
27 #include <linux/console.h>
31 struct start_info _xen_start_info;
32 struct start_info *xen_start_info = &_xen_start_info;
33 EXPORT_SYMBOL(xen_start_info);
35 enum xen_domain_type xen_domain_type = XEN_NATIVE;
36 EXPORT_SYMBOL(xen_domain_type);
38 struct shared_info xen_dummy_shared_info;
39 struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
41 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
42 static struct vcpu_info __percpu *xen_vcpu_info;
44 /* These are unused until we support booting "pre-ballooned" */
45 unsigned long xen_released_pages;
46 struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
48 static __read_mostly unsigned int xen_events_irq;
50 static __initdata struct device_node *xen_node;
52 int xen_remap_domain_gfn_array(struct vm_area_struct *vma,
54 xen_pfn_t *gfn, int nr,
55 int *err_ptr, pgprot_t prot,
59 return xen_xlate_remap_gfn_array(vma, addr, gfn, nr, err_ptr,
62 EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_array);
64 /* Not used by XENFEAT_auto_translated guests. */
65 int xen_remap_domain_gfn_range(struct vm_area_struct *vma,
67 xen_pfn_t gfn, int nr,
68 pgprot_t prot, unsigned domid,
73 EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_range);
75 int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
76 int nr, struct page **pages)
78 return xen_xlate_unmap_gfn_range(vma, nr, pages);
80 EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
82 static void xen_percpu_init(void)
84 struct vcpu_register_vcpu_info info;
85 struct vcpu_info *vcpup;
89 pr_info("Xen: initializing cpu%d\n", cpu);
90 vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
92 info.mfn = __pa(vcpup) >> PAGE_SHIFT;
93 info.offset = offset_in_page(vcpup);
95 err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
97 per_cpu(xen_vcpu, cpu) = vcpup;
99 enable_percpu_irq(xen_events_irq, 0);
103 static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
105 struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
107 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
111 static void xen_power_off(void)
113 struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
115 rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
119 static int xen_cpu_notification(struct notifier_block *self,
120 unsigned long action,
134 static struct notifier_block xen_cpu_notifier = {
135 .notifier_call = xen_cpu_notification,
138 static irqreturn_t xen_arm_callback(int irq, void *arg)
140 xen_hvm_evtchn_do_upcall();
145 * see Documentation/devicetree/bindings/arm/xen.txt for the
146 * documentation of the Xen Device Tree format.
148 #define GRANT_TABLE_PHYSADDR 0
149 void __init xen_early_init(void)
152 const char *s = NULL;
153 const char *version = NULL;
154 const char *xen_prefix = "xen,xen-";
156 xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
158 pr_debug("No Xen support\n");
161 s = of_get_property(xen_node, "compatible", &len);
162 if (strlen(xen_prefix) + 3 < len &&
163 !strncmp(xen_prefix, s, strlen(xen_prefix)))
164 version = s + strlen(xen_prefix);
165 if (version == NULL) {
166 pr_debug("Xen version not found\n");
170 pr_info("Xen %s support found\n", version);
172 xen_domain_type = XEN_HVM_DOMAIN;
174 xen_setup_features();
176 if (xen_feature(XENFEAT_dom0))
177 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
179 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
181 if (!console_set_on_cmdline && !xen_initial_domain())
182 add_preferred_console("hvc", 0, NULL);
185 static int __init xen_guest_init(void)
187 struct xen_add_to_physmap xatp;
188 struct shared_info *shared_info_page = NULL;
190 phys_addr_t grant_frames;
195 if (of_address_to_resource(xen_node, GRANT_TABLE_PHYSADDR, &res)) {
196 pr_err("Xen grant table base address not found\n");
199 grant_frames = res.start;
201 xen_events_irq = irq_of_parse_and_map(xen_node, 0);
202 if (!xen_events_irq) {
203 pr_err("Xen event channel interrupt not found\n");
207 shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
209 if (!shared_info_page) {
210 pr_err("not enough memory\n");
213 xatp.domid = DOMID_SELF;
215 xatp.space = XENMAPSPACE_shared_info;
216 xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
217 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
220 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
222 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
223 * page, we use it in the event channel upcall and in some pvclock
225 * The shared info contains exactly 1 CPU (the boot CPU). The guest
226 * is required to use VCPUOP_register_vcpu_info to place vcpu info
227 * for secondary CPUs as they are brought up.
228 * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
230 xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
231 sizeof(struct vcpu_info));
232 if (xen_vcpu_info == NULL)
235 if (gnttab_setup_auto_xlat_frames(grant_frames)) {
236 free_percpu(xen_vcpu_info);
240 if (!xen_initial_domain())
244 * Making sure board specific code will not set up ops for
245 * cpu idle and cpu freq.
252 if (request_percpu_irq(xen_events_irq, xen_arm_callback,
253 "events", &xen_vcpu)) {
254 pr_err("Error request IRQ %d\n", xen_events_irq);
260 register_cpu_notifier(&xen_cpu_notifier);
264 early_initcall(xen_guest_init);
266 static int __init xen_pm_init(void)
271 pm_power_off = xen_power_off;
272 arm_pm_restart = xen_restart;
276 late_initcall(xen_pm_init);
280 void xen_arch_pre_suspend(void) { }
281 void xen_arch_post_suspend(int suspend_cancelled) { }
282 void xen_timer_resume(void) { }
283 void xen_arch_resume(void) { }
284 void xen_arch_suspend(void) { }
287 /* In the hypervisor.S file. */
288 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
289 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
290 EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
291 EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
292 EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
293 EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
294 EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
295 EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
296 EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
297 EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
298 EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
299 EXPORT_SYMBOL_GPL(privcmd_call);