Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Xen SMP support |
| 3 | * |
| 4 | * This file implements the Xen versions of smp_ops. SMP under Xen is |
| 5 | * very straightforward. Bringing a CPU up is simply a matter of |
| 6 | * loading its initial context and setting it running. |
| 7 | * |
| 8 | * IPIs are handled through the Xen event mechanism. |
| 9 | * |
| 10 | * Because virtual CPUs can be scheduled onto any real CPU, there's no |
| 11 | * useful topology information for the kernel to make use of. As a |
| 12 | * result, all CPUs are treated as if they're single-core and |
| 13 | * single-threaded. |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 14 | */ |
| 15 | #include <linux/sched.h> |
| 16 | #include <linux/err.h> |
| 17 | #include <linux/smp.h> |
| 18 | |
| 19 | #include <asm/paravirt.h> |
| 20 | #include <asm/desc.h> |
| 21 | #include <asm/pgtable.h> |
| 22 | #include <asm/cpu.h> |
| 23 | |
| 24 | #include <xen/interface/xen.h> |
| 25 | #include <xen/interface/vcpu.h> |
| 26 | |
| 27 | #include <asm/xen/interface.h> |
| 28 | #include <asm/xen/hypercall.h> |
| 29 | |
| 30 | #include <xen/page.h> |
| 31 | #include <xen/events.h> |
| 32 | |
| 33 | #include "xen-ops.h" |
| 34 | #include "mmu.h" |
| 35 | |
Mike Travis | b78936e | 2008-12-16 17:33:57 -0800 | [diff] [blame] | 36 | cpumask_var_t xen_cpu_initialized_map; |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 37 | |
| 38 | static DEFINE_PER_CPU(int, resched_irq); |
| 39 | static DEFINE_PER_CPU(int, callfunc_irq); |
| 40 | static DEFINE_PER_CPU(int, callfuncsingle_irq); |
Jeremy Fitzhardinge | ee523ca | 2008-03-17 16:37:18 -0700 | [diff] [blame] | 41 | static DEFINE_PER_CPU(int, debug_irq) = -1; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 42 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 43 | static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id); |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 44 | static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 45 | |
| 46 | /* |
| 47 | * Reschedule call back. Nothing to do, |
| 48 | * all the work is done automatically when |
| 49 | * we return from the interrupt. |
| 50 | */ |
| 51 | static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id) |
| 52 | { |
Jeremy Fitzhardinge | 38bb5ab | 2008-05-26 23:31:16 +0100 | [diff] [blame] | 53 | #ifdef CONFIG_X86_32 |
| 54 | __get_cpu_var(irq_stat).irq_resched_count++; |
| 55 | #else |
| 56 | add_pda(irq_resched_count, 1); |
| 57 | #endif |
| 58 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 59 | return IRQ_HANDLED; |
| 60 | } |
| 61 | |
Alex Nixon | d68d82a | 2008-08-22 11:52:15 +0100 | [diff] [blame] | 62 | static __cpuinit void cpu_bringup(void) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 63 | { |
| 64 | int cpu = smp_processor_id(); |
| 65 | |
| 66 | cpu_init(); |
Alex Nixon | d68d82a | 2008-08-22 11:52:15 +0100 | [diff] [blame] | 67 | touch_softlockup_watchdog(); |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 68 | preempt_disable(); |
| 69 | |
Jeremy Fitzhardinge | e2a81ba | 2008-03-17 16:37:17 -0700 | [diff] [blame] | 70 | xen_enable_sysenter(); |
Jeremy Fitzhardinge | 6fcac6d | 2008-07-08 15:07:14 -0700 | [diff] [blame] | 71 | xen_enable_syscall(); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 72 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 73 | cpu = smp_processor_id(); |
| 74 | smp_store_cpu_info(cpu); |
| 75 | cpu_data(cpu).x86_max_cores = 1; |
| 76 | set_cpu_sibling_map(cpu); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 77 | |
| 78 | xen_setup_cpu_clockevents(); |
| 79 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 80 | cpu_set(cpu, cpu_online_map); |
| 81 | x86_write_percpu(cpu_state, CPU_ONLINE); |
| 82 | wmb(); |
| 83 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 84 | /* We can take interrupts now: we're officially "up". */ |
| 85 | local_irq_enable(); |
| 86 | |
| 87 | wmb(); /* make sure everything is out */ |
Alex Nixon | d68d82a | 2008-08-22 11:52:15 +0100 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | static __cpuinit void cpu_bringup_and_idle(void) |
| 91 | { |
| 92 | cpu_bringup(); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 93 | cpu_idle(); |
| 94 | } |
| 95 | |
| 96 | static int xen_smp_intr_init(unsigned int cpu) |
| 97 | { |
| 98 | int rc; |
Jeremy Fitzhardinge | ee523ca | 2008-03-17 16:37:18 -0700 | [diff] [blame] | 99 | const char *resched_name, *callfunc_name, *debug_name; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 100 | |
| 101 | resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu); |
| 102 | rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR, |
| 103 | cpu, |
| 104 | xen_reschedule_interrupt, |
| 105 | IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING, |
| 106 | resched_name, |
| 107 | NULL); |
| 108 | if (rc < 0) |
| 109 | goto fail; |
| 110 | per_cpu(resched_irq, cpu) = rc; |
| 111 | |
| 112 | callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu); |
| 113 | rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR, |
| 114 | cpu, |
| 115 | xen_call_function_interrupt, |
| 116 | IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING, |
| 117 | callfunc_name, |
| 118 | NULL); |
| 119 | if (rc < 0) |
| 120 | goto fail; |
| 121 | per_cpu(callfunc_irq, cpu) = rc; |
| 122 | |
Jeremy Fitzhardinge | ee523ca | 2008-03-17 16:37:18 -0700 | [diff] [blame] | 123 | debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu); |
| 124 | rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt, |
| 125 | IRQF_DISABLED | IRQF_PERCPU | IRQF_NOBALANCING, |
| 126 | debug_name, NULL); |
| 127 | if (rc < 0) |
| 128 | goto fail; |
| 129 | per_cpu(debug_irq, cpu) = rc; |
| 130 | |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 131 | callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu); |
| 132 | rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR, |
| 133 | cpu, |
| 134 | xen_call_function_single_interrupt, |
| 135 | IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING, |
| 136 | callfunc_name, |
| 137 | NULL); |
| 138 | if (rc < 0) |
| 139 | goto fail; |
| 140 | per_cpu(callfuncsingle_irq, cpu) = rc; |
| 141 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 142 | return 0; |
| 143 | |
| 144 | fail: |
| 145 | if (per_cpu(resched_irq, cpu) >= 0) |
| 146 | unbind_from_irqhandler(per_cpu(resched_irq, cpu), NULL); |
| 147 | if (per_cpu(callfunc_irq, cpu) >= 0) |
| 148 | unbind_from_irqhandler(per_cpu(callfunc_irq, cpu), NULL); |
Jeremy Fitzhardinge | ee523ca | 2008-03-17 16:37:18 -0700 | [diff] [blame] | 149 | if (per_cpu(debug_irq, cpu) >= 0) |
| 150 | unbind_from_irqhandler(per_cpu(debug_irq, cpu), NULL); |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 151 | if (per_cpu(callfuncsingle_irq, cpu) >= 0) |
| 152 | unbind_from_irqhandler(per_cpu(callfuncsingle_irq, cpu), NULL); |
| 153 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 154 | return rc; |
| 155 | } |
| 156 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 157 | static void __init xen_fill_possible_map(void) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 158 | { |
| 159 | int i, rc; |
| 160 | |
Mike Travis | e798673 | 2008-12-16 17:33:52 -0800 | [diff] [blame] | 161 | for (i = 0; i < nr_cpu_ids; i++) { |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 162 | rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL); |
Jeremy Fitzhardinge | 4560a29 | 2008-07-08 15:06:56 -0700 | [diff] [blame] | 163 | if (rc >= 0) { |
| 164 | num_processors++; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 165 | cpu_set(i, cpu_possible_map); |
Jeremy Fitzhardinge | 4560a29 | 2008-07-08 15:06:56 -0700 | [diff] [blame] | 166 | } |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 167 | } |
| 168 | } |
| 169 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 170 | static void __init xen_smp_prepare_boot_cpu(void) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 171 | { |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 172 | BUG_ON(smp_processor_id() != 0); |
| 173 | native_smp_prepare_boot_cpu(); |
| 174 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 175 | /* We've switched to the "real" per-cpu gdt, so make sure the |
| 176 | old memory can be recycled */ |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 177 | make_lowmem_page_readwrite(&per_cpu_var(gdt_page)); |
Jeremy Fitzhardinge | 60223a3 | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 178 | |
| 179 | xen_setup_vcpu_info_placement(); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 180 | } |
| 181 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 182 | static void __init xen_smp_prepare_cpus(unsigned int max_cpus) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 183 | { |
| 184 | unsigned cpu; |
| 185 | |
Jeremy Fitzhardinge | 2d9e1e2 | 2008-07-07 12:07:53 -0700 | [diff] [blame] | 186 | xen_init_lock_cpu(0); |
| 187 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 188 | smp_store_cpu_info(0); |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 189 | cpu_data(0).x86_max_cores = 1; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 190 | set_cpu_sibling_map(0); |
| 191 | |
| 192 | if (xen_smp_intr_init(0)) |
| 193 | BUG(); |
| 194 | |
Mike Travis | b78936e | 2008-12-16 17:33:57 -0800 | [diff] [blame] | 195 | if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL)) |
| 196 | panic("could not allocate xen_cpu_initialized_map\n"); |
| 197 | |
| 198 | cpumask_copy(xen_cpu_initialized_map, cpumask_of(0)); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 199 | |
| 200 | /* Restrict the possible_map according to max_cpus. */ |
| 201 | while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) { |
Mike Travis | e798673 | 2008-12-16 17:33:52 -0800 | [diff] [blame] | 202 | for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 203 | continue; |
| 204 | cpu_clear(cpu, cpu_possible_map); |
| 205 | } |
| 206 | |
| 207 | for_each_possible_cpu (cpu) { |
| 208 | struct task_struct *idle; |
| 209 | |
| 210 | if (cpu == 0) |
| 211 | continue; |
| 212 | |
| 213 | idle = fork_idle(cpu); |
| 214 | if (IS_ERR(idle)) |
| 215 | panic("failed fork for CPU %d", cpu); |
| 216 | |
| 217 | cpu_set(cpu, cpu_present_map); |
| 218 | } |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 219 | } |
| 220 | |
| 221 | static __cpuinit int |
| 222 | cpu_initialize_context(unsigned int cpu, struct task_struct *idle) |
| 223 | { |
| 224 | struct vcpu_guest_context *ctxt; |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 225 | struct desc_struct *gdt; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 226 | |
Mike Travis | b78936e | 2008-12-16 17:33:57 -0800 | [diff] [blame] | 227 | if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map)) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 228 | return 0; |
| 229 | |
| 230 | ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL); |
| 231 | if (ctxt == NULL) |
| 232 | return -ENOMEM; |
| 233 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 234 | gdt = get_cpu_gdt_table(cpu); |
| 235 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 236 | ctxt->flags = VGCF_IN_KERNEL; |
| 237 | ctxt->user_regs.ds = __USER_DS; |
| 238 | ctxt->user_regs.es = __USER_DS; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 239 | ctxt->user_regs.ss = __KERNEL_DS; |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 240 | #ifdef CONFIG_X86_32 |
| 241 | ctxt->user_regs.fs = __KERNEL_PERCPU; |
| 242 | #endif |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 243 | ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle; |
| 244 | ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */ |
| 245 | |
| 246 | memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt)); |
| 247 | |
| 248 | xen_copy_trap_info(ctxt->trap_ctxt); |
| 249 | |
| 250 | ctxt->ldt_ents = 0; |
| 251 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 252 | BUG_ON((unsigned long)gdt & ~PAGE_MASK); |
| 253 | make_lowmem_page_readonly(gdt); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 254 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 255 | ctxt->gdt_frames[0] = virt_to_mfn(gdt); |
| 256 | ctxt->gdt_ents = GDT_ENTRIES; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 257 | |
| 258 | ctxt->user_regs.cs = __KERNEL_CS; |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 259 | ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 260 | |
| 261 | ctxt->kernel_ss = __KERNEL_DS; |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 262 | ctxt->kernel_sp = idle->thread.sp0; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 263 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 264 | #ifdef CONFIG_X86_32 |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 265 | ctxt->event_callback_cs = __KERNEL_CS; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 266 | ctxt->failsafe_callback_cs = __KERNEL_CS; |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 267 | #endif |
| 268 | ctxt->event_callback_eip = (unsigned long)xen_hypervisor_callback; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 269 | ctxt->failsafe_callback_eip = (unsigned long)xen_failsafe_callback; |
| 270 | |
| 271 | per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir); |
| 272 | ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir)); |
| 273 | |
| 274 | if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt)) |
| 275 | BUG(); |
| 276 | |
| 277 | kfree(ctxt); |
| 278 | return 0; |
| 279 | } |
| 280 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 281 | static int __cpuinit xen_cpu_up(unsigned int cpu) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 282 | { |
| 283 | struct task_struct *idle = idle_task(cpu); |
| 284 | int rc; |
| 285 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 286 | #ifdef CONFIG_X86_32 |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 287 | init_gdt(cpu); |
| 288 | per_cpu(current_task, cpu) = idle; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 289 | irq_ctx_init(cpu); |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 290 | #else |
| 291 | cpu_pda(cpu)->pcurrent = idle; |
| 292 | clear_tsk_thread_flag(idle, TIF_FORK); |
| 293 | #endif |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 294 | xen_setup_timer(cpu); |
Jeremy Fitzhardinge | 2d9e1e2 | 2008-07-07 12:07:53 -0700 | [diff] [blame] | 295 | xen_init_lock_cpu(cpu); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 296 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 297 | per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; |
| 298 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 299 | /* make sure interrupts start blocked */ |
| 300 | per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1; |
| 301 | |
| 302 | rc = cpu_initialize_context(cpu, idle); |
| 303 | if (rc) |
| 304 | return rc; |
| 305 | |
| 306 | if (num_online_cpus() == 1) |
| 307 | alternatives_smp_switch(1); |
| 308 | |
| 309 | rc = xen_smp_intr_init(cpu); |
| 310 | if (rc) |
| 311 | return rc; |
| 312 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 313 | rc = HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL); |
| 314 | BUG_ON(rc); |
| 315 | |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 316 | while(per_cpu(cpu_state, cpu) != CPU_ONLINE) { |
| 317 | HYPERVISOR_sched_op(SCHEDOP_yield, 0); |
| 318 | barrier(); |
| 319 | } |
| 320 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 321 | return 0; |
| 322 | } |
| 323 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 324 | static void xen_smp_cpus_done(unsigned int max_cpus) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 325 | { |
| 326 | } |
| 327 | |
Alex Nixon | 2737146 | 2008-09-08 13:43:33 +0100 | [diff] [blame] | 328 | #ifdef CONFIG_HOTPLUG_CPU |
Alex Nixon | 26fd105 | 2008-09-08 13:43:34 +0100 | [diff] [blame] | 329 | static int xen_cpu_disable(void) |
Alex Nixon | d68d82a | 2008-08-22 11:52:15 +0100 | [diff] [blame] | 330 | { |
| 331 | unsigned int cpu = smp_processor_id(); |
| 332 | if (cpu == 0) |
| 333 | return -EBUSY; |
| 334 | |
| 335 | cpu_disable_common(); |
| 336 | |
| 337 | load_cr3(swapper_pg_dir); |
| 338 | return 0; |
| 339 | } |
| 340 | |
Alex Nixon | 26fd105 | 2008-09-08 13:43:34 +0100 | [diff] [blame] | 341 | static void xen_cpu_die(unsigned int cpu) |
Alex Nixon | d68d82a | 2008-08-22 11:52:15 +0100 | [diff] [blame] | 342 | { |
| 343 | while (HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL)) { |
| 344 | current->state = TASK_UNINTERRUPTIBLE; |
| 345 | schedule_timeout(HZ/10); |
| 346 | } |
| 347 | unbind_from_irqhandler(per_cpu(resched_irq, cpu), NULL); |
| 348 | unbind_from_irqhandler(per_cpu(callfunc_irq, cpu), NULL); |
| 349 | unbind_from_irqhandler(per_cpu(debug_irq, cpu), NULL); |
| 350 | unbind_from_irqhandler(per_cpu(callfuncsingle_irq, cpu), NULL); |
| 351 | xen_uninit_lock_cpu(cpu); |
| 352 | xen_teardown_timer(cpu); |
| 353 | |
| 354 | if (num_online_cpus() == 1) |
| 355 | alternatives_smp_switch(0); |
| 356 | } |
| 357 | |
Al Viro | df6b079 | 2008-11-22 17:38:04 +0000 | [diff] [blame] | 358 | static void __cpuinit xen_play_dead(void) /* used only with CPU_HOTPLUG */ |
Alex Nixon | d68d82a | 2008-08-22 11:52:15 +0100 | [diff] [blame] | 359 | { |
| 360 | play_dead_common(); |
| 361 | HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL); |
| 362 | cpu_bringup(); |
| 363 | } |
| 364 | |
Alex Nixon | 2737146 | 2008-09-08 13:43:33 +0100 | [diff] [blame] | 365 | #else /* !CONFIG_HOTPLUG_CPU */ |
Alex Nixon | 26fd105 | 2008-09-08 13:43:34 +0100 | [diff] [blame] | 366 | static int xen_cpu_disable(void) |
Alex Nixon | 2737146 | 2008-09-08 13:43:33 +0100 | [diff] [blame] | 367 | { |
| 368 | return -ENOSYS; |
| 369 | } |
| 370 | |
Alex Nixon | 26fd105 | 2008-09-08 13:43:34 +0100 | [diff] [blame] | 371 | static void xen_cpu_die(unsigned int cpu) |
Alex Nixon | 2737146 | 2008-09-08 13:43:33 +0100 | [diff] [blame] | 372 | { |
| 373 | BUG(); |
| 374 | } |
| 375 | |
Alex Nixon | 26fd105 | 2008-09-08 13:43:34 +0100 | [diff] [blame] | 376 | static void xen_play_dead(void) |
Alex Nixon | 2737146 | 2008-09-08 13:43:33 +0100 | [diff] [blame] | 377 | { |
| 378 | BUG(); |
| 379 | } |
| 380 | |
| 381 | #endif |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 382 | static void stop_self(void *v) |
| 383 | { |
| 384 | int cpu = smp_processor_id(); |
| 385 | |
| 386 | /* make sure we're not pinning something down */ |
| 387 | load_cr3(swapper_pg_dir); |
| 388 | /* should set up a minimal gdt */ |
| 389 | |
| 390 | HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL); |
| 391 | BUG(); |
| 392 | } |
| 393 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 394 | static void xen_smp_send_stop(void) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 395 | { |
Jens Axboe | 8691e5a | 2008-06-06 11:18:06 +0200 | [diff] [blame] | 396 | smp_call_function(stop_self, NULL, 0); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 397 | } |
| 398 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 399 | static void xen_smp_send_reschedule(int cpu) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 400 | { |
| 401 | xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR); |
| 402 | } |
| 403 | |
Mike Travis | bcda016 | 2008-12-16 17:33:59 -0800 | [diff] [blame] | 404 | static void xen_send_IPI_mask(const struct cpumask *mask, |
| 405 | enum ipi_vector vector) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 406 | { |
| 407 | unsigned cpu; |
| 408 | |
Mike Travis | bcda016 | 2008-12-16 17:33:59 -0800 | [diff] [blame] | 409 | for_each_cpu_and(cpu, mask, cpu_online_mask) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 410 | xen_send_IPI_one(cpu, vector); |
| 411 | } |
| 412 | |
Mike Travis | bcda016 | 2008-12-16 17:33:59 -0800 | [diff] [blame] | 413 | static void xen_smp_send_call_function_ipi(const struct cpumask *mask) |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 414 | { |
| 415 | int cpu; |
| 416 | |
| 417 | xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR); |
| 418 | |
| 419 | /* Make sure other vcpus get a chance to run if they need to. */ |
Mike Travis | bcda016 | 2008-12-16 17:33:59 -0800 | [diff] [blame] | 420 | for_each_cpu(cpu, mask) { |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 421 | if (xen_vcpu_stolen(cpu)) { |
| 422 | HYPERVISOR_sched_op(SCHEDOP_yield, 0); |
| 423 | break; |
| 424 | } |
| 425 | } |
| 426 | } |
| 427 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 428 | static void xen_smp_send_call_function_single_ipi(int cpu) |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 429 | { |
Mike Travis | bcda016 | 2008-12-16 17:33:59 -0800 | [diff] [blame] | 430 | xen_send_IPI_mask(cpumask_of(cpu), |
Mike Travis | e798673 | 2008-12-16 17:33:52 -0800 | [diff] [blame] | 431 | XEN_CALL_FUNCTION_SINGLE_VECTOR); |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 432 | } |
| 433 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 434 | static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id) |
| 435 | { |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 436 | irq_enter(); |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 437 | generic_smp_call_function_interrupt(); |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 438 | #ifdef CONFIG_X86_32 |
Joe Korty | 38e760a | 2007-10-17 18:04:40 +0200 | [diff] [blame] | 439 | __get_cpu_var(irq_stat).irq_call_count++; |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 440 | #else |
| 441 | add_pda(irq_call_count, 1); |
| 442 | #endif |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 443 | irq_exit(); |
| 444 | |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 445 | return IRQ_HANDLED; |
| 446 | } |
| 447 | |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 448 | static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id) |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 449 | { |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 450 | irq_enter(); |
| 451 | generic_smp_call_function_single_interrupt(); |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 452 | #ifdef CONFIG_X86_32 |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 453 | __get_cpu_var(irq_stat).irq_call_count++; |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 454 | #else |
| 455 | add_pda(irq_call_count, 1); |
| 456 | #endif |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 457 | irq_exit(); |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 458 | |
Jens Axboe | 3b16cf8 | 2008-06-26 11:21:54 +0200 | [diff] [blame] | 459 | return IRQ_HANDLED; |
Jeremy Fitzhardinge | f87e4ca | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 460 | } |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 461 | |
| 462 | static const struct smp_ops xen_smp_ops __initdata = { |
| 463 | .smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu, |
| 464 | .smp_prepare_cpus = xen_smp_prepare_cpus, |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 465 | .smp_cpus_done = xen_smp_cpus_done, |
| 466 | |
Alex Nixon | d68d82a | 2008-08-22 11:52:15 +0100 | [diff] [blame] | 467 | .cpu_up = xen_cpu_up, |
| 468 | .cpu_die = xen_cpu_die, |
| 469 | .cpu_disable = xen_cpu_disable, |
| 470 | .play_dead = xen_play_dead, |
| 471 | |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 472 | .smp_send_stop = xen_smp_send_stop, |
| 473 | .smp_send_reschedule = xen_smp_send_reschedule, |
| 474 | |
| 475 | .send_call_func_ipi = xen_smp_send_call_function_ipi, |
| 476 | .send_call_func_single_ipi = xen_smp_send_call_function_single_ipi, |
| 477 | }; |
| 478 | |
| 479 | void __init xen_smp_init(void) |
| 480 | { |
| 481 | smp_ops = xen_smp_ops; |
Jeremy Fitzhardinge | c7b7594 | 2008-07-08 15:06:43 -0700 | [diff] [blame] | 482 | xen_fill_possible_map(); |
Jeremy Fitzhardinge | 2d9e1e2 | 2008-07-07 12:07:53 -0700 | [diff] [blame] | 483 | xen_init_spinlocks(); |
Jeremy Fitzhardinge | a9e7062 | 2008-07-08 15:06:41 -0700 | [diff] [blame] | 484 | } |