arch/arm/xen/enlighten.c

   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 #include <linux/console.h>
  28
  29 #include <linux/mm.h>
  30
  31 struct start_info _xen_start_info;
  32 struct start_info *xen_start_info = &_xen_start_info;
  33 EXPORT_SYMBOL(xen_start_info);
  34
  35 enum xen_domain_type xen_domain_type = XEN_NATIVE;
  36 EXPORT_SYMBOL(xen_domain_type);
  37
  38 struct shared_info xen_dummy_shared_info;
  39 struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
  40
  41 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
  42 static struct vcpu_info __percpu *xen_vcpu_info;
  43
  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;
  47
  48 static __read_mostly unsigned int xen_events_irq;
  49
  50 static __initdata struct device_node *xen_node;
  51
  52 int xen_remap_domain_gfn_array(struct vm_area_struct *vma,
  53                                unsigned long addr,
  54                                xen_pfn_t *gfn, int nr,
  55                                int *err_ptr, pgprot_t prot,
  56                                unsigned domid,
  57                                struct page **pages)
  58 {
  59         return xen_xlate_remap_gfn_array(vma, addr, gfn, nr, err_ptr,
  60                                          prot, domid, pages);
  61 }
  62 EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_array);
  63
  64 /* Not used by XENFEAT_auto_translated guests. */
  65 int xen_remap_domain_gfn_range(struct vm_area_struct *vma,
  66                               unsigned long addr,
  67                               xen_pfn_t gfn, int nr,
  68                               pgprot_t prot, unsigned domid,
  69                               struct page **pages)
  70 {
  71         return -ENOSYS;
  72 }
  73 EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_range);
  74
  75 int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
  76                                int nr, struct page **pages)
  77 {
  78         return xen_xlate_unmap_gfn_range(vma, nr, pages);
  79 }
  80 EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
  81
  82 static void xen_percpu_init(void)
  83 {
  84         struct vcpu_register_vcpu_info info;
  85         struct vcpu_info *vcpup;
  86         int err;
  87         int cpu = get_cpu();
  88
  89         /*
  90          * VCPUOP_register_vcpu_info cannot be called twice for the same
  91          * vcpu, so if vcpu_info is already registered, just get out. This
  92          * can happen with cpu-hotplug.
  93          */
  94         if (per_cpu(xen_vcpu, cpu) != NULL)
  95                 goto after_register_vcpu_info;
  96
  97         pr_info("Xen: initializing cpu%d\n", cpu);
  98         vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
  99
 100         info.mfn = virt_to_gfn(vcpup);
 101         info.offset = xen_offset_in_page(vcpup);
 102
 103         err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
 104         BUG_ON(err);
 105         per_cpu(xen_vcpu, cpu) = vcpup;
 106
 107 after_register_vcpu_info:
 108         enable_percpu_irq(xen_events_irq, 0);
 109         put_cpu();
 110 }
 111
 112 static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
 113 {
 114         struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
 115         int rc;
 116         rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
 117         BUG_ON(rc);
 118 }
 119
 120 static void xen_power_off(void)
 121 {
 122         struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
 123         int rc;
 124         rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
 125         BUG_ON(rc);
 126 }
 127
 128 static int xen_cpu_notification(struct notifier_block *self,
 129                                 unsigned long action,
 130                                 void *hcpu)
 131 {
 132         switch (action) {
 133         case CPU_STARTING:
 134                 xen_percpu_init();
 135                 break;
 136         case CPU_DYING:
 137                 disable_percpu_irq(xen_events_irq);
 138                 break;
 139         default:
 140                 break;
 141         }
 142
 143         return NOTIFY_OK;
 144 }
 145
 146 static struct notifier_block xen_cpu_notifier = {
 147         .notifier_call = xen_cpu_notification,
 148 };
 149
 150 static irqreturn_t xen_arm_callback(int irq, void *arg)
 151 {
 152         xen_hvm_evtchn_do_upcall();
 153         return IRQ_HANDLED;
 154 }
 155
 156 /*
 157  * see Documentation/devicetree/bindings/arm/xen.txt for the
 158  * documentation of the Xen Device Tree format.
 159  */
 160 #define GRANT_TABLE_PHYSADDR 0
 161 void __init xen_early_init(void)
 162 {
 163         int len;
 164         const char *s = NULL;
 165         const char *version = NULL;
 166         const char *xen_prefix = "xen,xen-";
 167
 168         xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
 169         if (!xen_node) {
 170                 pr_debug("No Xen support\n");
 171                 return;
 172         }
 173         s = of_get_property(xen_node, "compatible", &len);
 174         if (strlen(xen_prefix) + 3  < len &&
 175                         !strncmp(xen_prefix, s, strlen(xen_prefix)))
 176                 version = s + strlen(xen_prefix);
 177         if (version == NULL) {
 178                 pr_debug("Xen version not found\n");
 179                 return;
 180         }
 181
 182         pr_info("Xen %s support found\n", version);
 183
 184         xen_domain_type = XEN_HVM_DOMAIN;
 185
 186         xen_setup_features();
 187
 188         if (xen_feature(XENFEAT_dom0))
 189                 xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
 190         else
 191                 xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
 192
 193         if (!console_set_on_cmdline && !xen_initial_domain())
 194                 add_preferred_console("hvc", 0, NULL);
 195 }
 196
 197 static int __init xen_guest_init(void)
 198 {
 199         struct xen_add_to_physmap xatp;
 200         struct shared_info *shared_info_page = NULL;
 201         struct resource res;
 202         phys_addr_t grant_frames;
 203
 204         if (!xen_domain())
 205                 return 0;
 206
 207         if (of_address_to_resource(xen_node, GRANT_TABLE_PHYSADDR, &res)) {
 208                 pr_err("Xen grant table base address not found\n");
 209                 return -ENODEV;
 210         }
 211         grant_frames = res.start;
 212
 213         xen_events_irq = irq_of_parse_and_map(xen_node, 0);
 214         if (!xen_events_irq) {
 215                 pr_err("Xen event channel interrupt not found\n");
 216                 return -ENODEV;
 217         }
 218
 219         shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
 220
 221         if (!shared_info_page) {
 222                 pr_err("not enough memory\n");
 223                 return -ENOMEM;
 224         }
 225         xatp.domid = DOMID_SELF;
 226         xatp.idx = 0;
 227         xatp.space = XENMAPSPACE_shared_info;
 228         xatp.gpfn = virt_to_gfn(shared_info_page);
 229         if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
 230                 BUG();
 231
 232         HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
 233
 234         /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
 235          * page, we use it in the event channel upcall and in some pvclock
 236          * related functions.
 237          * The shared info contains exactly 1 CPU (the boot CPU). The guest
 238          * is required to use VCPUOP_register_vcpu_info to place vcpu info
 239          * for secondary CPUs as they are brought up.
 240          * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
 241          */
 242         xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
 243                                                sizeof(struct vcpu_info));
 244         if (xen_vcpu_info == NULL)
 245                 return -ENOMEM;
 246
 247         if (gnttab_setup_auto_xlat_frames(grant_frames)) {
 248                 free_percpu(xen_vcpu_info);
 249                 return -ENOMEM;
 250         }
 251         gnttab_init();
 252         if (!xen_initial_domain())
 253                 xenbus_probe(NULL);
 254
 255         /*
 256          * Making sure board specific code will not set up ops for
 257          * cpu idle and cpu freq.
 258          */
 259         disable_cpuidle();
 260         disable_cpufreq();
 261
 262         xen_init_IRQ();
 263
 264         if (request_percpu_irq(xen_events_irq, xen_arm_callback,
 265                                "events", &xen_vcpu)) {
 266                 pr_err("Error request IRQ %d\n", xen_events_irq);
 267                 return -EINVAL;
 268         }
 269
 270         xen_percpu_init();
 271
 272         register_cpu_notifier(&xen_cpu_notifier);
 273
 274         return 0;
 275 }
 276 early_initcall(xen_guest_init);
 277
 278 static int __init xen_pm_init(void)
 279 {
 280         if (!xen_domain())
 281                 return -ENODEV;
 282
 283         pm_power_off = xen_power_off;
 284         arm_pm_restart = xen_restart;
 285
 286         return 0;
 287 }
 288 late_initcall(xen_pm_init);
 289
 290
 291 /* empty stubs */
 292 void xen_arch_pre_suspend(void) { }
 293 void xen_arch_post_suspend(int suspend_cancelled) { }
 294 void xen_timer_resume(void) { }
 295 void xen_arch_resume(void) { }
 296 void xen_arch_suspend(void) { }
 297
 298
 299 /* In the hypercall.S file. */
 300 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
 301 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
 302 EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
 303 EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
 304 EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
 305 EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
 306 EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
 307 EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
 308 EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
 309 EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
 310 EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
 311 EXPORT_SYMBOL_GPL(privcmd_call);