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