git.stricted.de - GitHub/moto-9609/android_kernel_motorola

1 /*

2 * HyperV Detection code.

3 *

5 * Author : K. Y. Srinivasan <ksrinivasan@novell.com>

6 *

7 * This program is free software; you can redistribute it and/or modify

8 * it under the terms of the GNU General Public License as published by

9 * the Free Software Foundation; version 2 of the License.

10 *

11 */

13 #include <linux/types.h>

14 #include <linux/time.h>

15 #include <linux/clocksource.h>

16 #include <linux/init.h>

17 #include <linux/export.h>

18 #include <linux/hardirq.h>

19 #include <linux/efi.h>

20 #include <linux/interrupt.h>

21 #include <linux/irq.h>

22 #include <linux/kexec.h>

23 #include <linux/i8253.h>

24 #include <asm/processor.h>

25 #include <asm/hypervisor.h>

26 #include <asm/hyperv.h>

27 #include <asm/mshyperv.h>

28 #include <asm/desc.h>

29 #include <asm/irq_regs.h>

30 #include <asm/i8259.h>

31 #include <asm/apic.h>

32 #include <asm/timer.h>

33 #include <asm/reboot.h>

34 #include <asm/nmi.h>

36 struct ms_hyperv_info ms_hyperv;

37 EXPORT_SYMBOL_GPL(ms_hyperv);

39 #if IS_ENABLED(CONFIG_HYPERV)

40 static void (*vmbus_handler)(void);

41 static void (*hv_kexec_handler)(void);

42 static void (*hv_crash_handler)(struct pt_regs *regs);

44 void hyperv_vector_handler(struct pt_regs *regs)

45 {

46 struct pt_regs *old_regs = set_irq_regs(regs);

48 entering_irq();

49 inc_irq_stat(irq_hv_callback_count);

50 if (vmbus_handler)

51 vmbus_handler();

53 if (ms_hyperv.hints & HV_X64_DEPRECATING_AEOI_RECOMMENDED)

54 ack_APIC_irq();

56 exiting_irq();

57 set_irq_regs(old_regs);

58 }

60 void hv_setup_vmbus_irq(void (*handler)(void))

61 {

62 vmbus_handler = handler;

63 }

65 void hv_remove_vmbus_irq(void)

66 {

67 /* We have no way to deallocate the interrupt gate */

68 vmbus_handler = NULL;

69 }

70 EXPORT_SYMBOL_GPL(hv_setup_vmbus_irq);

71 EXPORT_SYMBOL_GPL(hv_remove_vmbus_irq);

73 void hv_setup_kexec_handler(void (*handler)(void))

74 {

75 hv_kexec_handler = handler;

76 }

77 EXPORT_SYMBOL_GPL(hv_setup_kexec_handler);

79 void hv_remove_kexec_handler(void)

80 {

81 hv_kexec_handler = NULL;

82 }

83 EXPORT_SYMBOL_GPL(hv_remove_kexec_handler);

85 void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs))

86 {

87 hv_crash_handler = handler;

88 }

89 EXPORT_SYMBOL_GPL(hv_setup_crash_handler);

91 void hv_remove_crash_handler(void)

92 {

93 hv_crash_handler = NULL;

94 }

95 EXPORT_SYMBOL_GPL(hv_remove_crash_handler);

97 #ifdef CONFIG_KEXEC_CORE

98 static void hv_machine_shutdown(void)

99 {

100 if (kexec_in_progress && hv_kexec_handler)

101 hv_kexec_handler();

102 native_machine_shutdown();

103 }

104

105 static void hv_machine_crash_shutdown(struct pt_regs *regs)

106 {

107 if (hv_crash_handler)

108 hv_crash_handler(regs);

109 native_machine_crash_shutdown(regs);

110 }

111 #endif /* CONFIG_KEXEC_CORE */

112 #endif /* CONFIG_HYPERV */

113

114 static uint32_t __init ms_hyperv_platform(void)

115 {

116 u32 eax;

117 u32 hyp_signature[3];

118

119 if (!boot_cpu_has(X86_FEATURE_HYPERVISOR))

120 return 0;

121

122 cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS,

123 &eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]);

124

125 if (eax >= HYPERV_CPUID_MIN &&

126 eax <= HYPERV_CPUID_MAX &&

127 !memcmp("Microsoft Hv", hyp_signature, 12))

128 return HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS;

129

130 return 0;

131 }

132

133 static unsigned char hv_get_nmi_reason(void)

134 {

135 return 0;

136 }

137

138 #ifdef CONFIG_X86_LOCAL_APIC

139 /*

140 * Prior to WS2016 Debug-VM sends NMIs to all CPUs which makes

141 * it dificult to process CHANNELMSG_UNLOAD in case of crash. Handle

142 * unknown NMI on the first CPU which gets it.

143 */

144 static int hv_nmi_unknown(unsigned int val, struct pt_regs *regs)

145 {

146 static atomic_t nmi_cpu = ATOMIC_INIT(-1);

147

148 if (!unknown_nmi_panic)

149 return NMI_DONE;

150

151 if (atomic_cmpxchg(&nmi_cpu, -1, raw_smp_processor_id()) != -1)

152 return NMI_HANDLED;

153

154 return NMI_DONE;

155 }

156 #endif

157

158 static unsigned long hv_get_tsc_khz(void)

159 {

160 unsigned long freq;

161

162 rdmsrl(HV_X64_MSR_TSC_FREQUENCY, freq);

163

164 return freq / 1000;

165 }

166

167 static void __init ms_hyperv_init_platform(void)

168 {

169 int hv_host_info_eax;

170 int hv_host_info_ebx;

171 int hv_host_info_ecx;

172 int hv_host_info_edx;

173

174 /*

175 * Extract the features and hints

176 */

177 ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES);

178 ms_hyperv.misc_features = cpuid_edx(HYPERV_CPUID_FEATURES);

179 ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO);

180

181 pr_info("Hyper-V: features 0x%x, hints 0x%x\n",

182 ms_hyperv.features, ms_hyperv.hints);

183

184 ms_hyperv.max_vp_index = cpuid_eax(HVCPUID_IMPLEMENTATION_LIMITS);

185 ms_hyperv.max_lp_index = cpuid_ebx(HVCPUID_IMPLEMENTATION_LIMITS);

186

187 pr_debug("Hyper-V: max %u virtual processors, %u logical processors\n",

188 ms_hyperv.max_vp_index, ms_hyperv.max_lp_index);

189

190 /*

191 * Extract host information.

192 */

193 if (cpuid_eax(HVCPUID_VENDOR_MAXFUNCTION) >= HVCPUID_VERSION) {

194 hv_host_info_eax = cpuid_eax(HVCPUID_VERSION);

195 hv_host_info_ebx = cpuid_ebx(HVCPUID_VERSION);

196 hv_host_info_ecx = cpuid_ecx(HVCPUID_VERSION);

197 hv_host_info_edx = cpuid_edx(HVCPUID_VERSION);

198

199 pr_info("Hyper-V Host Build:%d-%d.%d-%d-%d.%d\n",

200 hv_host_info_eax, hv_host_info_ebx >> 16,

201 hv_host_info_ebx & 0xFFFF, hv_host_info_ecx,

202 hv_host_info_edx >> 24, hv_host_info_edx & 0xFFFFFF);

203 }

204

205 if (ms_hyperv.features & HV_X64_ACCESS_FREQUENCY_MSRS &&

206 ms_hyperv.misc_features & HV_FEATURE_FREQUENCY_MSRS_AVAILABLE) {

207 x86_platform.calibrate_tsc = hv_get_tsc_khz;

208 x86_platform.calibrate_cpu = hv_get_tsc_khz;

209 }

210

211 #ifdef CONFIG_X86_LOCAL_APIC

212 if (ms_hyperv.features & HV_X64_ACCESS_FREQUENCY_MSRS &&

213 ms_hyperv.misc_features & HV_FEATURE_FREQUENCY_MSRS_AVAILABLE) {

214 /*

215 * Get the APIC frequency.

216 */

217 u64 hv_lapic_frequency;

218

219 rdmsrl(HV_X64_MSR_APIC_FREQUENCY, hv_lapic_frequency);

220 hv_lapic_frequency = div_u64(hv_lapic_frequency, HZ);

221 lapic_timer_frequency = hv_lapic_frequency;

222 pr_info("Hyper-V: LAPIC Timer Frequency: %#x\n",

223 lapic_timer_frequency);

224 }

225

226 register_nmi_handler(NMI_UNKNOWN, hv_nmi_unknown, NMI_FLAG_FIRST,

227 "hv_nmi_unknown");

228 #endif

229

230 #ifdef CONFIG_X86_IO_APIC

231 no_timer_check = 1;

232 #endif

233

234 #if IS_ENABLED(CONFIG_HYPERV) && defined(CONFIG_KEXEC_CORE)

235 machine_ops.shutdown = hv_machine_shutdown;

236 machine_ops.crash_shutdown = hv_machine_crash_shutdown;

237 #endif

238 mark_tsc_unstable("running on Hyper-V");

239

240 /*

241 * Generation 2 instances don't support reading the NMI status from

242 * 0x61 port.

243 */

244 if (efi_enabled(EFI_BOOT))

245 x86_platform.get_nmi_reason = hv_get_nmi_reason;

246

247 /*

248 * Hyper-V VMs have a PIT emulation quirk such that zeroing the

249 * counter register during PIT shutdown restarts the PIT. So it

250 * continues to interrupt @18.2 HZ. Setting i8253_clear_counter

251 * to false tells pit_shutdown() not to zero the counter so that

252 * the PIT really is shutdown. Generation 2 VMs don't have a PIT,

253 * and setting this value has no effect.

254 */

255 i8253_clear_counter_on_shutdown = false;

256

257 #if IS_ENABLED(CONFIG_HYPERV)

258 /*

259 * Setup the hook to get control post apic initialization.

260 */

261 x86_platform.apic_post_init = hyperv_init;

262 hyperv_setup_mmu_ops();

263 /* Setup the IDT for hypervisor callback */

264 alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, hyperv_callback_vector);

265 #endif

266 }

267

268 const __initconst struct hypervisor_x86 x86_hyper_ms_hyperv = {

269 .name = "Microsoft Hyper-V",

270 .detect = ms_hyperv_platform,

271 .type = X86_HYPER_MS_HYPERV,

272 .init.init_platform = ms_hyperv_init_platform,

273 };