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