do_machine_check

函数名称：The actual machine check handler. This only handles real* exceptions when something got corrupted coming in through int 18.* This is executed in NMI context not subject to normal locking rules. This* implies that most kernel services cannot be safely used

函数原型：void do_machine_check(struct pt_regs *regs, long error_code)

返回类型：void

参数：

类型	参数	名称
struct pt_regs *	regs
long	error_code

1231

DECLARE_BITMAP(valid_banks, Maximum banks number.* This is the limit of the current register layout on* Intel CPUs.)

1232

DECLARE_BITMAP(toclear, Maximum banks number.* This is the limit of the current register layout on* Intel CPUs.)

1233

cfg等于mca_cfg

1234

cpu等于当前cpu ID()

1235

msg等于"Unknown"

1237

worst等于0

1243

order等于负1

1249

no_way_out等于0

1255

kill_it等于0

1261

lmce等于1

1263

如果Cases where we avoid rendezvous handler timeout:* 1) If this CPU is offline则返回

1266

In IST context, we explicitly disable preemption. This serves two* purposes: it makes it much less likely that we would accidentally* schedule in IST context and it will force a warning if we somehow* manage to schedule by accident.

1268

this_cpu_inc(mce_exception_count)

1270

Collect all global (w.r.t. this processor) status about this machine* check into our "mce" struct so that we can use it later to assess* the severity of the problem as we read per-bank specific details.

1271

CPU time stamp counter 等于dtsc() - returns the current TSC without ordering constraints* rdtsc() returns the result of RDTSC as a 64-bit integer

1273

final等于this_cpu_ptr( & mces_seen)

1274

final等于m

1276

memset(valid_banks, 0, valid_banks的长度)

1277

no_way_out等于Do a quick check if any of the events requires a panic.* This decides if we keep the events around or clear them.

1279

The "volatile" is due to gcc bugs ()

1286

如果非Machine Check Global Status MSR 按位与start ip valid 的值则kill_it等于1

1293

如果Kernel's X86_VENDOR enum 恒等于X86_VENDOR_INTEL或Kernel's X86_VENDOR enum 恒等于X86_VENDOR_ZHAOXIN则lmce等于Machine Check Global Status MSR 按位与LMCE signaled

1304

如果lmce则

1305

如果no_way_out则mce_panic("Fatal local machine check", & m, msg)

1307

否则

1308

order等于Start of Monarch synchronization. This waits until all CPUs have* entered the exception handler and then determines if any of them* saw a fatal event that requires panic. Then it executes them* in the entry order.* TBD double check parallel CPU hotunplug

1311

__mc_scan_banks( & m, final, toclear, valid_banks, no_way_out, & worst)

1313

如果非no_way_out则mce_clear_state(toclear)

1320

如果非lmce则

1321

如果Synchronize between CPUs after main scanning loop.* This invokes the bulk of the Monarch processing.小于0则no_way_out等于worst大于等于MCE_PANIC_SEVERITY

1323

否则

1332

如果worst大于等于MCE_PANIC_SEVERITY且tolerant小于3则

1333

mce_severity( & m, tolerant, & msg, true)

1334

mce_panic("Local fatal machine check!", & m, msg)

1342

如果tolerant恒等于3则kill_it等于0

1344

否则如果no_way_out则mce_panic("Fatal machine check on current CPU", & m, msg)

1347

如果worst大于0则irq_work_queue( & mce_irq_work)

1350

mce_wrmsrl(MSR_IA32_MCG_STATUS, 0)

1352

This function forces the icache and prefetched instruction stream to* catch up with reality in two very specific cases:* a) Text was modified using one virtual address and is about to be executed* from the same physical page at a different virtual address

1354

如果worst不等于MCE_AR_SEVERITY且非kill_it则转到:out_ist

1358

如果Code segment 按位与3的值恒等于3则

1359

st_begin_non_atomic() - begin a non-atomic section in an IST exception*@regs: regs passed to the IST exception handler* IST exception handlers normally cannot schedule

1360

1362

如果kill_it或do_memory_failure( & m)则force_sig(SIGBUS)

1364

1365

st_end_non_atomic() - begin a non-atomic section in an IST exception* Ends a non-atomic section started with ist_begin_non_atomic().

1366

否则

1367

如果非fixup_exception(regs, X86_TRAP_MC, error_code, 0)则mce_panic("Failed kernel mode recovery", & m, NULL)

1371

1372

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