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
  28 #include <linux/mm.h>
  29
  30 struct start_info _xen_start_info;
  31 struct start_info *xen_start_info = &_xen_start_info;
  32 EXPORT_SYMBOL(xen_start_info);
  33
  34 enum xen_domain_type xen_domain_type = XEN_NATIVE;
  35 EXPORT_SYMBOL(xen_domain_type);
  36
  37 struct shared_info xen_dummy_shared_info;
  38 struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
  39
  40 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
  41 static struct vcpu_info __percpu *xen_vcpu_info;
  42
  43 /* These are unused until we support booting "pre-ballooned" */
  44 unsigned long xen_released_pages;
  45 struct 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;
  49 EXPORT_SYMBOL_GPL(xen_have_vector_callback);
  50
  51 int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
  52 EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
  53
  54 static __read_mostly int xen_events_irq = -1;
  55
  56 int 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 }
  66 EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_array);
  67
  68 /* Not used by XENFEAT_auto_translated guests. */
  69 int 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 }
  77 EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
  78
  79 int 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 }
  84 EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);
  85
  86 static 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
 107 static 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
 115 static 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
 123 static 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
 138 static struct notifier_block xen_cpu_notifier = {
 139         .notifier_call = xen_cpu_notification,
 140 };
 141
 142 static 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
 153 static 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 }
 255 early_initcall(xen_guest_init);
 256
 257 static 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 }
 267 late_initcall(xen_pm_init);
 268
 269
 270 /* empty stubs */
 271 void xen_arch_pre_suspend(void) { }
 272 void xen_arch_post_suspend(int suspend_cancelled) { }
 273 void xen_timer_resume(void) { }
 274 void xen_arch_resume(void) { }
 275
 276
 277 /* In the hypervisor.S file. */
 278 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
 279 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
 280 EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
 281 EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
 282 EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
 283 EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
 284 EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
 285 EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
 286 EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
 287 EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
 288 EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
 289 EXPORT_SYMBOL_GPL(privcmd_call);