1#include <xen/xen.h>
2#include <xen/events.h>
3#include <xen/grant_table.h>
4#include <xen/hvm.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>
12#include <xen/page.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>
21#include <linux/of.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
28#include <linux/mm.h>
29
30struct start_info _xen_start_info;
31struct start_info *xen_start_info = &_xen_start_info;
32EXPORT_SYMBOL(xen_start_info);
33
34enum xen_domain_type xen_domain_type = XEN_NATIVE;
35EXPORT_SYMBOL(xen_domain_type);
36
37struct shared_info xen_dummy_shared_info;
38struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
39
40DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
41static struct vcpu_info __percpu *xen_vcpu_info;
42
43/* These are unused until we support booting "pre-ballooned" */
44unsigned long xen_released_pages;
45struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
46
47/* TODO: to be removed */
48__read_mostly int xen_have_vector_callback;
49EXPORT_SYMBOL_GPL(xen_have_vector_callback);
50
51int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
52EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
53
54static __read_mostly int xen_events_irq = -1;
55
56int xen_remap_domain_mfn_array(struct vm_area_struct *vma,
57			       unsigned long addr,
58			       xen_pfn_t *mfn, int nr,
59			       int *err_ptr, pgprot_t prot,
60			       unsigned domid,
61			       struct page **pages)
62{
63	return xen_xlate_remap_gfn_array(vma, addr, mfn, nr, err_ptr,
64					 prot, domid, pages);
65}
66EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_array);
67
68/* Not used by XENFEAT_auto_translated guests. */
69int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
70                              unsigned long addr,
71                              xen_pfn_t mfn, int nr,
72                              pgprot_t prot, unsigned domid,
73                              struct page **pages)
74{
75	return -ENOSYS;
76}
77EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
78
79int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
80			       int nr, struct page **pages)
81{
82	return xen_xlate_unmap_gfn_range(vma, nr, pages);
83}
84EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);
85
86static void xen_percpu_init(void)
87{
88	struct vcpu_register_vcpu_info info;
89	struct vcpu_info *vcpup;
90	int err;
91	int cpu = get_cpu();
92
93	pr_info("Xen: initializing cpu%d\n", cpu);
94	vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
95
96	info.mfn = __pa(vcpup) >> PAGE_SHIFT;
97	info.offset = offset_in_page(vcpup);
98
99	err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
100	BUG_ON(err);
101	per_cpu(xen_vcpu, cpu) = vcpup;
102
103	enable_percpu_irq(xen_events_irq, 0);
104	put_cpu();
105}
106
107static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
108{
109	struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
110	int rc;
111	rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
112	BUG_ON(rc);
113}
114
115static void xen_power_off(void)
116{
117	struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
118	int rc;
119	rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
120	BUG_ON(rc);
121}
122
123static int xen_cpu_notification(struct notifier_block *self,
124				unsigned long action,
125				void *hcpu)
126{
127	switch (action) {
128	case CPU_STARTING:
129		xen_percpu_init();
130		break;
131	default:
132		break;
133	}
134
135	return NOTIFY_OK;
136}
137
138static struct notifier_block xen_cpu_notifier = {
139	.notifier_call = xen_cpu_notification,
140};
141
142static irqreturn_t xen_arm_callback(int irq, void *arg)
143{
144	xen_hvm_evtchn_do_upcall();
145	return IRQ_HANDLED;
146}
147
148/*
149 * see Documentation/devicetree/bindings/arm/xen.txt for the
150 * documentation of the Xen Device Tree format.
151 */
152#define GRANT_TABLE_PHYSADDR 0
153static int __init xen_guest_init(void)
154{
155	struct xen_add_to_physmap xatp;
156	static struct shared_info *shared_info_page = 0;
157	struct device_node *node;
158	int len;
159	const char *s = NULL;
160	const char *version = NULL;
161	const char *xen_prefix = "xen,xen-";
162	struct resource res;
163	phys_addr_t grant_frames;
164
165	node = of_find_compatible_node(NULL, NULL, "xen,xen");
166	if (!node) {
167		pr_debug("No Xen support\n");
168		return 0;
169	}
170	s = of_get_property(node, "compatible", &len);
171	if (strlen(xen_prefix) + 3  < len &&
172			!strncmp(xen_prefix, s, strlen(xen_prefix)))
173		version = s + strlen(xen_prefix);
174	if (version == NULL) {
175		pr_debug("Xen version not found\n");
176		return 0;
177	}
178	if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res))
179		return 0;
180	grant_frames = res.start;
181	xen_events_irq = irq_of_parse_and_map(node, 0);
182	pr_info("Xen %s support found, events_irq=%d gnttab_frame=%pa\n",
183			version, xen_events_irq, &grant_frames);
184
185	if (xen_events_irq < 0)
186		return -ENODEV;
187
188	xen_domain_type = XEN_HVM_DOMAIN;
189
190	xen_setup_features();
191
192	if (xen_feature(XENFEAT_dom0))
193		xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
194	else
195		xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
196
197	if (!shared_info_page)
198		shared_info_page = (struct shared_info *)
199			get_zeroed_page(GFP_KERNEL);
200	if (!shared_info_page) {
201		pr_err("not enough memory\n");
202		return -ENOMEM;
203	}
204	xatp.domid = DOMID_SELF;
205	xatp.idx = 0;
206	xatp.space = XENMAPSPACE_shared_info;
207	xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
208	if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
209		BUG();
210
211	HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
212
213	/* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
214	 * page, we use it in the event channel upcall and in some pvclock
215	 * related functions.
216	 * The shared info contains exactly 1 CPU (the boot CPU). The guest
217	 * is required to use VCPUOP_register_vcpu_info to place vcpu info
218	 * for secondary CPUs as they are brought up.
219	 * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
220	 */
221	xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
222			                       sizeof(struct vcpu_info));
223	if (xen_vcpu_info == NULL)
224		return -ENOMEM;
225
226	if (gnttab_setup_auto_xlat_frames(grant_frames)) {
227		free_percpu(xen_vcpu_info);
228		return -ENOMEM;
229	}
230	gnttab_init();
231	if (!xen_initial_domain())
232		xenbus_probe(NULL);
233
234	/*
235	 * Making sure board specific code will not set up ops for
236	 * cpu idle and cpu freq.
237	 */
238	disable_cpuidle();
239	disable_cpufreq();
240
241	xen_init_IRQ();
242
243	if (request_percpu_irq(xen_events_irq, xen_arm_callback,
244			       "events", &xen_vcpu)) {
245		pr_err("Error request IRQ %d\n", xen_events_irq);
246		return -EINVAL;
247	}
248
249	xen_percpu_init();
250
251	register_cpu_notifier(&xen_cpu_notifier);
252
253	return 0;
254}
255early_initcall(xen_guest_init);
256
257static int __init xen_pm_init(void)
258{
259	if (!xen_domain())
260		return -ENODEV;
261
262	pm_power_off = xen_power_off;
263	arm_pm_restart = xen_restart;
264
265	return 0;
266}
267late_initcall(xen_pm_init);
268
269
270/* empty stubs */
271void xen_arch_pre_suspend(void) { }
272void xen_arch_post_suspend(int suspend_cancelled) { }
273void xen_timer_resume(void) { }
274void xen_arch_resume(void) { }
275void xen_arch_suspend(void) { }
276
277
278/* In the hypervisor.S file. */
279EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
280EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
281EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
282EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
283EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
284EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
285EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
286EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
287EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
288EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
289EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
290EXPORT_SYMBOL_GPL(privcmd_call);
291