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