tools/testing/selftests/kvm/aarch64/arch_timer.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * The test validates both the virtual and physical timer IRQs using
   4  * CVAL and TVAL registers.
   5  *
   6  * Copyright (c) 2021, Google LLC.
   7  */
   8 #define _GNU_SOURCE
   9
  10 #include "arch_timer.h"
  11 #include "delay.h"
  12 #include "gic.h"
  13 #include "processor.h"
  14 #include "timer_test.h"
  15 #include "vgic.h"
  16
  17 #define GICD_BASE_GPA                   0x8000000ULL
  18 #define GICR_BASE_GPA                   0x80A0000ULL
  19
  20 enum guest_stage {
  21         GUEST_STAGE_VTIMER_CVAL = 1,
  22         GUEST_STAGE_VTIMER_TVAL,
  23         GUEST_STAGE_PTIMER_CVAL,
  24         GUEST_STAGE_PTIMER_TVAL,
  25         GUEST_STAGE_MAX,
  26 };
  27
  28 static int vtimer_irq, ptimer_irq;
  29
  30 static void
  31 guest_configure_timer_action(struct test_vcpu_shared_data *shared_data)
  32 {
  33         switch (shared_data->guest_stage) {
  34         case GUEST_STAGE_VTIMER_CVAL:
  35                 timer_set_next_cval_ms(VIRTUAL, test_args.timer_period_ms);
  36                 shared_data->xcnt = timer_get_cntct(VIRTUAL);
  37                 timer_set_ctl(VIRTUAL, CTL_ENABLE);
  38                 break;
  39         case GUEST_STAGE_VTIMER_TVAL:
  40                 timer_set_next_tval_ms(VIRTUAL, test_args.timer_period_ms);
  41                 shared_data->xcnt = timer_get_cntct(VIRTUAL);
  42                 timer_set_ctl(VIRTUAL, CTL_ENABLE);
  43                 break;
  44         case GUEST_STAGE_PTIMER_CVAL:
  45                 timer_set_next_cval_ms(PHYSICAL, test_args.timer_period_ms);
  46                 shared_data->xcnt = timer_get_cntct(PHYSICAL);
  47                 timer_set_ctl(PHYSICAL, CTL_ENABLE);
  48                 break;
  49         case GUEST_STAGE_PTIMER_TVAL:
  50                 timer_set_next_tval_ms(PHYSICAL, test_args.timer_period_ms);
  51                 shared_data->xcnt = timer_get_cntct(PHYSICAL);
  52                 timer_set_ctl(PHYSICAL, CTL_ENABLE);
  53                 break;
  54         default:
  55                 GUEST_ASSERT(0);
  56         }
  57 }
  58
  59 static void guest_validate_irq(unsigned int intid,
  60                                 struct test_vcpu_shared_data *shared_data)
  61 {
  62         enum guest_stage stage = shared_data->guest_stage;
  63         uint64_t xcnt = 0, xcnt_diff_us, cval = 0;
  64         unsigned long xctl = 0;
  65         unsigned int timer_irq = 0;
  66         unsigned int accessor;
  67
  68         if (intid == IAR_SPURIOUS)
  69                 return;
  70
  71         switch (stage) {
  72         case GUEST_STAGE_VTIMER_CVAL:
  73         case GUEST_STAGE_VTIMER_TVAL:
  74                 accessor = VIRTUAL;
  75                 timer_irq = vtimer_irq;
  76                 break;
  77         case GUEST_STAGE_PTIMER_CVAL:
  78         case GUEST_STAGE_PTIMER_TVAL:
  79                 accessor = PHYSICAL;
  80                 timer_irq = ptimer_irq;
  81                 break;
  82         default:
  83                 GUEST_ASSERT(0);
  84                 return;
  85         }
  86
  87         xctl = timer_get_ctl(accessor);
  88         if ((xctl & CTL_IMASK) || !(xctl & CTL_ENABLE))
  89                 return;
  90
  91         timer_set_ctl(accessor, CTL_IMASK);
  92         xcnt = timer_get_cntct(accessor);
  93         cval = timer_get_cval(accessor);
  94
  95         xcnt_diff_us = cycles_to_usec(xcnt - shared_data->xcnt);
  96
  97         /* Make sure we are dealing with the correct timer IRQ */
  98         GUEST_ASSERT_EQ(intid, timer_irq);
  99
 100         /* Basic 'timer condition met' check */
 101         __GUEST_ASSERT(xcnt >= cval,
 102                        "xcnt = 0x%lx, cval = 0x%lx, xcnt_diff_us = 0x%lx",
 103                        xcnt, cval, xcnt_diff_us);
 104         __GUEST_ASSERT(xctl & CTL_ISTATUS, "xctl = 0x%lx", xctl);
 105
 106         WRITE_ONCE(shared_data->nr_iter, shared_data->nr_iter + 1);
 107 }
 108
 109 static void guest_irq_handler(struct ex_regs *regs)
 110 {
 111         unsigned int intid = gic_get_and_ack_irq();
 112         uint32_t cpu = guest_get_vcpuid();
 113         struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
 114
 115         guest_validate_irq(intid, shared_data);
 116
 117         gic_set_eoi(intid);
 118 }
 119
 120 static void guest_run_stage(struct test_vcpu_shared_data *shared_data,
 121                                 enum guest_stage stage)
 122 {
 123         uint32_t irq_iter, config_iter;
 124
 125         shared_data->guest_stage = stage;
 126         shared_data->nr_iter = 0;
 127
 128         for (config_iter = 0; config_iter < test_args.nr_iter; config_iter++) {
 129                 /* Setup the next interrupt */
 130                 guest_configure_timer_action(shared_data);
 131
 132                 /* Setup a timeout for the interrupt to arrive */
 133                 udelay(msecs_to_usecs(test_args.timer_period_ms) +
 134                         test_args.timer_err_margin_us);
 135
 136                 irq_iter = READ_ONCE(shared_data->nr_iter);
 137                 __GUEST_ASSERT(config_iter + 1 == irq_iter,
 138                                 "config_iter + 1 = 0x%x, irq_iter = 0x%x.\n"
 139                                 "  Guest timer interrupt was not trigged within the specified\n"
 140                                 "  interval, try to increase the error margin by [-e] option.\n",
 141                                 config_iter + 1, irq_iter);
 142         }
 143 }
 144
 145 static void guest_code(void)
 146 {
 147         uint32_t cpu = guest_get_vcpuid();
 148         struct test_vcpu_shared_data *shared_data = &vcpu_shared_data[cpu];
 149
 150         local_irq_disable();
 151
 152         gic_init(GIC_V3, test_args.nr_vcpus,
 153                 (void *)GICD_BASE_GPA, (void *)GICR_BASE_GPA);
 154
 155         timer_set_ctl(VIRTUAL, CTL_IMASK);
 156         timer_set_ctl(PHYSICAL, CTL_IMASK);
 157
 158         gic_irq_enable(vtimer_irq);
 159         gic_irq_enable(ptimer_irq);
 160         local_irq_enable();
 161
 162         guest_run_stage(shared_data, GUEST_STAGE_VTIMER_CVAL);
 163         guest_run_stage(shared_data, GUEST_STAGE_VTIMER_TVAL);
 164         guest_run_stage(shared_data, GUEST_STAGE_PTIMER_CVAL);
 165         guest_run_stage(shared_data, GUEST_STAGE_PTIMER_TVAL);
 166
 167         GUEST_DONE();
 168 }
 169
 170 static void test_init_timer_irq(struct kvm_vm *vm)
 171 {
 172         /* Timer initid should be same for all the vCPUs, so query only vCPU-0 */
 173         vcpu_device_attr_get(vcpus[0], KVM_ARM_VCPU_TIMER_CTRL,
 174                              KVM_ARM_VCPU_TIMER_IRQ_PTIMER, &ptimer_irq);
 175         vcpu_device_attr_get(vcpus[0], KVM_ARM_VCPU_TIMER_CTRL,
 176                              KVM_ARM_VCPU_TIMER_IRQ_VTIMER, &vtimer_irq);
 177
 178         sync_global_to_guest(vm, ptimer_irq);
 179         sync_global_to_guest(vm, vtimer_irq);
 180
 181         pr_debug("ptimer_irq: %d; vtimer_irq: %d\n", ptimer_irq, vtimer_irq);
 182 }
 183
 184 static int gic_fd;
 185
 186 struct kvm_vm *test_vm_create(void)
 187 {
 188         struct kvm_vm *vm;
 189         unsigned int i;
 190         int nr_vcpus = test_args.nr_vcpus;
 191
 192         vm = vm_create_with_vcpus(nr_vcpus, guest_code, vcpus);
 193
 194         vm_init_descriptor_tables(vm);
 195         vm_install_exception_handler(vm, VECTOR_IRQ_CURRENT, guest_irq_handler);
 196
 197         if (!test_args.reserved) {
 198                 if (kvm_has_cap(KVM_CAP_COUNTER_OFFSET)) {
 199                         struct kvm_arm_counter_offset offset = {
 200                                 .counter_offset = test_args.counter_offset,
 201                                 .reserved = 0,
 202                         };
 203                         vm_ioctl(vm, KVM_ARM_SET_COUNTER_OFFSET, &offset);
 204                 } else
 205                         TEST_FAIL("no support for global offset");
 206         }
 207
 208         for (i = 0; i < nr_vcpus; i++)
 209                 vcpu_init_descriptor_tables(vcpus[i]);
 210
 211         test_init_timer_irq(vm);
 212         gic_fd = vgic_v3_setup(vm, nr_vcpus, 64, GICD_BASE_GPA, GICR_BASE_GPA);
 213         __TEST_REQUIRE(gic_fd >= 0, "Failed to create vgic-v3");
 214
 215         /* Make all the test's cmdline args visible to the guest */
 216         sync_global_to_guest(vm, test_args);
 217
 218         return vm;
 219 }
 220
 221 void test_vm_cleanup(struct kvm_vm *vm)
 222 {
 223         close(gic_fd);
 224         kvm_vm_free(vm);
 225 }