11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * S390 version 3a53c8fabSHeiko Carstens * Copyright IBM Corp. 1999 41da177e4SLinus Torvalds * Author(s): Hartmut Penner (hp@de.ibm.com) 51da177e4SLinus Torvalds * Ulrich Weigand (uweigand@de.ibm.com) 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * Derived from "arch/i386/mm/fault.c" 81da177e4SLinus Torvalds * Copyright (C) 1995 Linus Torvalds 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds 11052ff461SHeiko Carstens #include <linux/kernel_stat.h> 12cdd6c482SIngo Molnar #include <linux/perf_event.h> 131da177e4SLinus Torvalds #include <linux/signal.h> 141da177e4SLinus Torvalds #include <linux/sched.h> 151da177e4SLinus Torvalds #include <linux/kernel.h> 161da177e4SLinus Torvalds #include <linux/errno.h> 171da177e4SLinus Torvalds #include <linux/string.h> 181da177e4SLinus Torvalds #include <linux/types.h> 191da177e4SLinus Torvalds #include <linux/ptrace.h> 201da177e4SLinus Torvalds #include <linux/mman.h> 211da177e4SLinus Torvalds #include <linux/mm.h> 227757591aSHeiko Carstens #include <linux/compat.h> 231da177e4SLinus Torvalds #include <linux/smp.h> 241eeb66a1SChristoph Hellwig #include <linux/kdebug.h> 251da177e4SLinus Torvalds #include <linux/init.h> 261da177e4SLinus Torvalds #include <linux/console.h> 271da177e4SLinus Torvalds #include <linux/module.h> 281da177e4SLinus Torvalds #include <linux/hardirq.h> 294ba069b8SMichael Grundy #include <linux/kprobes.h> 30be5ec363SMartin Schwidefsky #include <linux/uaccess.h> 3153492b1dSGerald Schaefer #include <linux/hugetlb.h> 32cbb870c8SHeiko Carstens #include <asm/asm-offsets.h> 331da177e4SLinus Torvalds #include <asm/pgtable.h> 34d7b250e2SHeiko Carstens #include <asm/irq.h> 356252d702SMartin Schwidefsky #include <asm/mmu_context.h> 36a0616cdeSDavid Howells #include <asm/facility.h> 37a806170eSHeiko Carstens #include "../kernel/entry.h" 381da177e4SLinus Torvalds 39347a8dc3SMartin Schwidefsky #ifndef CONFIG_64BIT 401da177e4SLinus Torvalds #define __FAIL_ADDR_MASK 0x7ffff000 411da177e4SLinus Torvalds #define __SUBCODE_MASK 0x0200 421da177e4SLinus Torvalds #define __PF_RES_FIELD 0ULL 43347a8dc3SMartin Schwidefsky #else /* CONFIG_64BIT */ 441da177e4SLinus Torvalds #define __FAIL_ADDR_MASK -4096L 451da177e4SLinus Torvalds #define __SUBCODE_MASK 0x0600 461da177e4SLinus Torvalds #define __PF_RES_FIELD 0x8000000000000000ULL 47347a8dc3SMartin Schwidefsky #endif /* CONFIG_64BIT */ 481da177e4SLinus Torvalds 4950d7280dSMartin Schwidefsky #define VM_FAULT_BADCONTEXT 0x010000 5050d7280dSMartin Schwidefsky #define VM_FAULT_BADMAP 0x020000 5150d7280dSMartin Schwidefsky #define VM_FAULT_BADACCESS 0x040000 52f2c76e3bSHeiko Carstens #define VM_FAULT_SIGNAL 0x080000 5324eb3a82SDominik Dingel #define VM_FAULT_PFAULT 0x100000 5450d7280dSMartin Schwidefsky 55a4f32bdbSHeiko Carstens static unsigned long store_indication __read_mostly; 5692f842eaSMartin Schwidefsky 57a4f32bdbSHeiko Carstens #ifdef CONFIG_64BIT 58a4f32bdbSHeiko Carstens static int __init fault_init(void) 5992f842eaSMartin Schwidefsky { 60a4f32bdbSHeiko Carstens if (test_facility(75)) 6192f842eaSMartin Schwidefsky store_indication = 0xc00; 62a4f32bdbSHeiko Carstens return 0; 6392f842eaSMartin Schwidefsky } 64a4f32bdbSHeiko Carstens early_initcall(fault_init); 65a4f32bdbSHeiko Carstens #endif 6692f842eaSMartin Schwidefsky 677ecb344aSMartin Schwidefsky static inline int notify_page_fault(struct pt_regs *regs) 6810c1031fSMartin Schwidefsky { 6933464e3bSChristoph Hellwig int ret = 0; 7033464e3bSChristoph Hellwig 7133464e3bSChristoph Hellwig /* kprobe_running() needs smp_processor_id() */ 7222e0a046SHeiko Carstens if (kprobes_built_in() && !user_mode(regs)) { 7333464e3bSChristoph Hellwig preempt_disable(); 7433464e3bSChristoph Hellwig if (kprobe_running() && kprobe_fault_handler(regs, 14)) 7533464e3bSChristoph Hellwig ret = 1; 7633464e3bSChristoph Hellwig preempt_enable(); 7733464e3bSChristoph Hellwig } 7833464e3bSChristoph Hellwig return ret; 794ba069b8SMichael Grundy } 804ba069b8SMichael Grundy 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds /* 831da177e4SLinus Torvalds * Unlock any spinlocks which will prevent us from getting the 84cefc8be8SKirill Korotaev * message out. 851da177e4SLinus Torvalds */ 861da177e4SLinus Torvalds void bust_spinlocks(int yes) 871da177e4SLinus Torvalds { 881da177e4SLinus Torvalds if (yes) { 891da177e4SLinus Torvalds oops_in_progress = 1; 901da177e4SLinus Torvalds } else { 911da177e4SLinus Torvalds int loglevel_save = console_loglevel; 921da177e4SLinus Torvalds console_unblank(); 931da177e4SLinus Torvalds oops_in_progress = 0; 941da177e4SLinus Torvalds /* 951da177e4SLinus Torvalds * OK, the message is on the console. Now we call printk() 961da177e4SLinus Torvalds * without oops_in_progress set so that printk will give klogd 971da177e4SLinus Torvalds * a poke. Hold onto your hats... 981da177e4SLinus Torvalds */ 991da177e4SLinus Torvalds console_loglevel = 15; 1001da177e4SLinus Torvalds printk(" "); 1011da177e4SLinus Torvalds console_loglevel = loglevel_save; 1021da177e4SLinus Torvalds } 1031da177e4SLinus Torvalds } 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds /* 106482b05ddSGerald Schaefer * Returns the address space associated with the fault. 10761365e13SMartin Schwidefsky * Returns 0 for kernel space and 1 for user space. 1081da177e4SLinus Torvalds */ 109457f2180SHeiko Carstens static inline int user_space_fault(struct pt_regs *regs) 1101da177e4SLinus Torvalds { 111457f2180SHeiko Carstens unsigned long trans_exc_code; 112457f2180SHeiko Carstens 1131da177e4SLinus Torvalds /* 11461365e13SMartin Schwidefsky * The lowest two bits of the translation exception 11561365e13SMartin Schwidefsky * identification indicate which paging table was used. 1161da177e4SLinus Torvalds */ 117457f2180SHeiko Carstens trans_exc_code = regs->int_parm_long & 3; 118457f2180SHeiko Carstens if (trans_exc_code == 3) /* home space -> kernel */ 119457f2180SHeiko Carstens return 0; 120457f2180SHeiko Carstens if (user_mode(regs)) 121457f2180SHeiko Carstens return 1; 122457f2180SHeiko Carstens if (trans_exc_code == 2) /* secondary space -> set_fs */ 12361365e13SMartin Schwidefsky return current->thread.mm_segment.ar4; 124457f2180SHeiko Carstens if (current->flags & PF_VCPU) 125457f2180SHeiko Carstens return 1; 126457f2180SHeiko Carstens return 0; 1271da177e4SLinus Torvalds } 1281da177e4SLinus Torvalds 1293b7df342SHeiko Carstens static int bad_address(void *p) 1303b7df342SHeiko Carstens { 1313b7df342SHeiko Carstens unsigned long dummy; 1323b7df342SHeiko Carstens 1333b7df342SHeiko Carstens return probe_kernel_address((unsigned long *)p, dummy); 1343b7df342SHeiko Carstens } 1353b7df342SHeiko Carstens 1363b7df342SHeiko Carstens #ifdef CONFIG_64BIT 1373b7df342SHeiko Carstens static void dump_pagetable(unsigned long asce, unsigned long address) 1383b7df342SHeiko Carstens { 1393b7df342SHeiko Carstens unsigned long *table = __va(asce & PAGE_MASK); 1403b7df342SHeiko Carstens 1413b7df342SHeiko Carstens pr_alert("AS:%016lx ", asce); 1423b7df342SHeiko Carstens switch (asce & _ASCE_TYPE_MASK) { 1433b7df342SHeiko Carstens case _ASCE_TYPE_REGION1: 1443b7df342SHeiko Carstens table = table + ((address >> 53) & 0x7ff); 1453b7df342SHeiko Carstens if (bad_address(table)) 1463b7df342SHeiko Carstens goto bad; 1473b7df342SHeiko Carstens pr_cont("R1:%016lx ", *table); 1483b7df342SHeiko Carstens if (*table & _REGION_ENTRY_INVALID) 1493b7df342SHeiko Carstens goto out; 1503b7df342SHeiko Carstens table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN); 1513b7df342SHeiko Carstens /* fallthrough */ 1523b7df342SHeiko Carstens case _ASCE_TYPE_REGION2: 1533b7df342SHeiko Carstens table = table + ((address >> 42) & 0x7ff); 1543b7df342SHeiko Carstens if (bad_address(table)) 1553b7df342SHeiko Carstens goto bad; 1563b7df342SHeiko Carstens pr_cont("R2:%016lx ", *table); 1573b7df342SHeiko Carstens if (*table & _REGION_ENTRY_INVALID) 1583b7df342SHeiko Carstens goto out; 1593b7df342SHeiko Carstens table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN); 1603b7df342SHeiko Carstens /* fallthrough */ 1613b7df342SHeiko Carstens case _ASCE_TYPE_REGION3: 1623b7df342SHeiko Carstens table = table + ((address >> 31) & 0x7ff); 1633b7df342SHeiko Carstens if (bad_address(table)) 1643b7df342SHeiko Carstens goto bad; 1653b7df342SHeiko Carstens pr_cont("R3:%016lx ", *table); 1663b7df342SHeiko Carstens if (*table & (_REGION_ENTRY_INVALID | _REGION3_ENTRY_LARGE)) 1673b7df342SHeiko Carstens goto out; 1683b7df342SHeiko Carstens table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN); 1693b7df342SHeiko Carstens /* fallthrough */ 1703b7df342SHeiko Carstens case _ASCE_TYPE_SEGMENT: 1713b7df342SHeiko Carstens table = table + ((address >> 20) & 0x7ff); 1723b7df342SHeiko Carstens if (bad_address(table)) 1733b7df342SHeiko Carstens goto bad; 1743b7df342SHeiko Carstens pr_cont(KERN_CONT "S:%016lx ", *table); 1753b7df342SHeiko Carstens if (*table & (_SEGMENT_ENTRY_INVALID | _SEGMENT_ENTRY_LARGE)) 1763b7df342SHeiko Carstens goto out; 1773b7df342SHeiko Carstens table = (unsigned long *)(*table & _SEGMENT_ENTRY_ORIGIN); 1783b7df342SHeiko Carstens } 1793b7df342SHeiko Carstens table = table + ((address >> 12) & 0xff); 1803b7df342SHeiko Carstens if (bad_address(table)) 1813b7df342SHeiko Carstens goto bad; 1823b7df342SHeiko Carstens pr_cont("P:%016lx ", *table); 1833b7df342SHeiko Carstens out: 1843b7df342SHeiko Carstens pr_cont("\n"); 1853b7df342SHeiko Carstens return; 1863b7df342SHeiko Carstens bad: 1873b7df342SHeiko Carstens pr_cont("BAD\n"); 1883b7df342SHeiko Carstens } 1893b7df342SHeiko Carstens 1903b7df342SHeiko Carstens #else /* CONFIG_64BIT */ 1913b7df342SHeiko Carstens 1923b7df342SHeiko Carstens static void dump_pagetable(unsigned long asce, unsigned long address) 1933b7df342SHeiko Carstens { 1943b7df342SHeiko Carstens unsigned long *table = __va(asce & PAGE_MASK); 1953b7df342SHeiko Carstens 1963b7df342SHeiko Carstens pr_alert("AS:%08lx ", asce); 1973b7df342SHeiko Carstens table = table + ((address >> 20) & 0x7ff); 1983b7df342SHeiko Carstens if (bad_address(table)) 1993b7df342SHeiko Carstens goto bad; 2003b7df342SHeiko Carstens pr_cont("S:%08lx ", *table); 2013b7df342SHeiko Carstens if (*table & _SEGMENT_ENTRY_INVALID) 2023b7df342SHeiko Carstens goto out; 2033b7df342SHeiko Carstens table = (unsigned long *)(*table & _SEGMENT_ENTRY_ORIGIN); 2043b7df342SHeiko Carstens table = table + ((address >> 12) & 0xff); 2053b7df342SHeiko Carstens if (bad_address(table)) 2063b7df342SHeiko Carstens goto bad; 2073b7df342SHeiko Carstens pr_cont("P:%08lx ", *table); 2083b7df342SHeiko Carstens out: 2093b7df342SHeiko Carstens pr_cont("\n"); 2103b7df342SHeiko Carstens return; 2113b7df342SHeiko Carstens bad: 2123b7df342SHeiko Carstens pr_cont("BAD\n"); 2133b7df342SHeiko Carstens } 2143b7df342SHeiko Carstens 2153b7df342SHeiko Carstens #endif /* CONFIG_64BIT */ 2163b7df342SHeiko Carstens 2173b7df342SHeiko Carstens static void dump_fault_info(struct pt_regs *regs) 2183b7df342SHeiko Carstens { 2193b7df342SHeiko Carstens unsigned long asce; 2203b7df342SHeiko Carstens 2213b7df342SHeiko Carstens pr_alert("Fault in "); 2223b7df342SHeiko Carstens switch (regs->int_parm_long & 3) { 2233b7df342SHeiko Carstens case 3: 2243b7df342SHeiko Carstens pr_cont("home space "); 2253b7df342SHeiko Carstens break; 2263b7df342SHeiko Carstens case 2: 2273b7df342SHeiko Carstens pr_cont("secondary space "); 2283b7df342SHeiko Carstens break; 2293b7df342SHeiko Carstens case 1: 2303b7df342SHeiko Carstens pr_cont("access register "); 2313b7df342SHeiko Carstens break; 2323b7df342SHeiko Carstens case 0: 2333b7df342SHeiko Carstens pr_cont("primary space "); 2343b7df342SHeiko Carstens break; 2353b7df342SHeiko Carstens } 2363b7df342SHeiko Carstens pr_cont("mode while using "); 2373b7df342SHeiko Carstens if (!user_space_fault(regs)) { 2383b7df342SHeiko Carstens asce = S390_lowcore.kernel_asce; 2393b7df342SHeiko Carstens pr_cont("kernel "); 2403b7df342SHeiko Carstens } 2413b7df342SHeiko Carstens #ifdef CONFIG_PGSTE 2423b7df342SHeiko Carstens else if ((current->flags & PF_VCPU) && S390_lowcore.gmap) { 2433b7df342SHeiko Carstens struct gmap *gmap = (struct gmap *)S390_lowcore.gmap; 2443b7df342SHeiko Carstens asce = gmap->asce; 2453b7df342SHeiko Carstens pr_cont("gmap "); 2463b7df342SHeiko Carstens } 2473b7df342SHeiko Carstens #endif 2483b7df342SHeiko Carstens else { 2493b7df342SHeiko Carstens asce = S390_lowcore.user_asce; 2503b7df342SHeiko Carstens pr_cont("user "); 2513b7df342SHeiko Carstens } 2523b7df342SHeiko Carstens pr_cont("ASCE.\n"); 2533b7df342SHeiko Carstens dump_pagetable(asce, regs->int_parm_long & __FAIL_ADDR_MASK); 2543b7df342SHeiko Carstens } 2553b7df342SHeiko Carstens 256aa33c8cbSMartin Schwidefsky static inline void report_user_fault(struct pt_regs *regs, long signr) 257ab3c68eeSHeiko Carstens { 258ab3c68eeSHeiko Carstens if ((task_pid_nr(current) > 1) && !show_unhandled_signals) 259ab3c68eeSHeiko Carstens return; 260ab3c68eeSHeiko Carstens if (!unhandled_signal(current, signr)) 261ab3c68eeSHeiko Carstens return; 262ab3c68eeSHeiko Carstens if (!printk_ratelimit()) 263ab3c68eeSHeiko Carstens return; 264aa33c8cbSMartin Schwidefsky printk(KERN_ALERT "User process fault: interruption code 0x%X ", 265aa33c8cbSMartin Schwidefsky regs->int_code); 266ab3c68eeSHeiko Carstens print_vma_addr(KERN_CONT "in ", regs->psw.addr & PSW_ADDR_INSN); 267aa33c8cbSMartin Schwidefsky printk(KERN_CONT "\n"); 2683b7df342SHeiko Carstens printk(KERN_ALERT "failing address: %016lx TEID: %016lx\n", 2693b7df342SHeiko Carstens regs->int_parm_long & __FAIL_ADDR_MASK, regs->int_parm_long); 2703b7df342SHeiko Carstens dump_fault_info(regs); 271ab3c68eeSHeiko Carstens show_regs(regs); 272ab3c68eeSHeiko Carstens } 273ab3c68eeSHeiko Carstens 2741da177e4SLinus Torvalds /* 2751da177e4SLinus Torvalds * Send SIGSEGV to task. This is an external routine 2761da177e4SLinus Torvalds * to keep the stack usage of do_page_fault small. 2771da177e4SLinus Torvalds */ 278aa33c8cbSMartin Schwidefsky static noinline void do_sigsegv(struct pt_regs *regs, int si_code) 2791da177e4SLinus Torvalds { 2801da177e4SLinus Torvalds struct siginfo si; 2811da177e4SLinus Torvalds 282aa33c8cbSMartin Schwidefsky report_user_fault(regs, SIGSEGV); 2831da177e4SLinus Torvalds si.si_signo = SIGSEGV; 2841da177e4SLinus Torvalds si.si_code = si_code; 285aa33c8cbSMartin Schwidefsky si.si_addr = (void __user *)(regs->int_parm_long & __FAIL_ADDR_MASK); 2861da177e4SLinus Torvalds force_sig_info(SIGSEGV, &si, current); 2871da177e4SLinus Torvalds } 2881da177e4SLinus Torvalds 289aa33c8cbSMartin Schwidefsky static noinline void do_no_context(struct pt_regs *regs) 29010c1031fSMartin Schwidefsky { 29110c1031fSMartin Schwidefsky const struct exception_table_entry *fixup; 29261365e13SMartin Schwidefsky unsigned long address; 29310c1031fSMartin Schwidefsky 29410c1031fSMartin Schwidefsky /* Are we prepared to handle this kernel fault? */ 29550d7280dSMartin Schwidefsky fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN); 29610c1031fSMartin Schwidefsky if (fixup) { 297eb608fb3SHeiko Carstens regs->psw.addr = extable_fixup(fixup) | PSW_ADDR_AMODE; 29810c1031fSMartin Schwidefsky return; 29910c1031fSMartin Schwidefsky } 30010c1031fSMartin Schwidefsky 30110c1031fSMartin Schwidefsky /* 30210c1031fSMartin Schwidefsky * Oops. The kernel tried to access some bad page. We'll have to 30310c1031fSMartin Schwidefsky * terminate things with extreme prejudice. 30410c1031fSMartin Schwidefsky */ 305aa33c8cbSMartin Schwidefsky address = regs->int_parm_long & __FAIL_ADDR_MASK; 306457f2180SHeiko Carstens if (!user_space_fault(regs)) 30710c1031fSMartin Schwidefsky printk(KERN_ALERT "Unable to handle kernel pointer dereference" 3083b7df342SHeiko Carstens " in virtual kernel address space\n"); 30910c1031fSMartin Schwidefsky else 31010c1031fSMartin Schwidefsky printk(KERN_ALERT "Unable to handle kernel paging request" 3113b7df342SHeiko Carstens " in virtual user address space\n"); 3123b7df342SHeiko Carstens printk(KERN_ALERT "failing address: %016lx TEID: %016lx\n", 3133b7df342SHeiko Carstens regs->int_parm_long & __FAIL_ADDR_MASK, regs->int_parm_long); 3143b7df342SHeiko Carstens dump_fault_info(regs); 315aa33c8cbSMartin Schwidefsky die(regs, "Oops"); 31610c1031fSMartin Schwidefsky do_exit(SIGKILL); 31710c1031fSMartin Schwidefsky } 31810c1031fSMartin Schwidefsky 319aa33c8cbSMartin Schwidefsky static noinline void do_low_address(struct pt_regs *regs) 32010c1031fSMartin Schwidefsky { 32110c1031fSMartin Schwidefsky /* Low-address protection hit in kernel mode means 32210c1031fSMartin Schwidefsky NULL pointer write access in kernel mode. */ 32310c1031fSMartin Schwidefsky if (regs->psw.mask & PSW_MASK_PSTATE) { 32410c1031fSMartin Schwidefsky /* Low-address protection hit in user mode 'cannot happen'. */ 325aa33c8cbSMartin Schwidefsky die (regs, "Low-address protection"); 32610c1031fSMartin Schwidefsky do_exit(SIGKILL); 32710c1031fSMartin Schwidefsky } 32810c1031fSMartin Schwidefsky 329aa33c8cbSMartin Schwidefsky do_no_context(regs); 33010c1031fSMartin Schwidefsky } 33110c1031fSMartin Schwidefsky 332aa33c8cbSMartin Schwidefsky static noinline void do_sigbus(struct pt_regs *regs) 33310c1031fSMartin Schwidefsky { 33410c1031fSMartin Schwidefsky struct task_struct *tsk = current; 33536bf9680SMartin Schwidefsky struct siginfo si; 33610c1031fSMartin Schwidefsky 33710c1031fSMartin Schwidefsky /* 33810c1031fSMartin Schwidefsky * Send a sigbus, regardless of whether we were in kernel 33910c1031fSMartin Schwidefsky * or user mode. 34010c1031fSMartin Schwidefsky */ 34136bf9680SMartin Schwidefsky si.si_signo = SIGBUS; 34236bf9680SMartin Schwidefsky si.si_errno = 0; 34336bf9680SMartin Schwidefsky si.si_code = BUS_ADRERR; 344aa33c8cbSMartin Schwidefsky si.si_addr = (void __user *)(regs->int_parm_long & __FAIL_ADDR_MASK); 34536bf9680SMartin Schwidefsky force_sig_info(SIGBUS, &si, tsk); 34610c1031fSMartin Schwidefsky } 34710c1031fSMartin Schwidefsky 348aa33c8cbSMartin Schwidefsky static noinline void do_fault_error(struct pt_regs *regs, int fault) 34950d7280dSMartin Schwidefsky { 35050d7280dSMartin Schwidefsky int si_code; 35150d7280dSMartin Schwidefsky 35250d7280dSMartin Schwidefsky switch (fault) { 35350d7280dSMartin Schwidefsky case VM_FAULT_BADACCESS: 35450d7280dSMartin Schwidefsky case VM_FAULT_BADMAP: 35550d7280dSMartin Schwidefsky /* Bad memory access. Check if it is kernel or user space. */ 3567d256175SHeiko Carstens if (user_mode(regs)) { 35750d7280dSMartin Schwidefsky /* User mode accesses just cause a SIGSEGV */ 35850d7280dSMartin Schwidefsky si_code = (fault == VM_FAULT_BADMAP) ? 35950d7280dSMartin Schwidefsky SEGV_MAPERR : SEGV_ACCERR; 360aa33c8cbSMartin Schwidefsky do_sigsegv(regs, si_code); 36150d7280dSMartin Schwidefsky return; 36250d7280dSMartin Schwidefsky } 36350d7280dSMartin Schwidefsky case VM_FAULT_BADCONTEXT: 36424eb3a82SDominik Dingel case VM_FAULT_PFAULT: 365aa33c8cbSMartin Schwidefsky do_no_context(regs); 36650d7280dSMartin Schwidefsky break; 367f2c76e3bSHeiko Carstens case VM_FAULT_SIGNAL: 368f2c76e3bSHeiko Carstens if (!user_mode(regs)) 369f2c76e3bSHeiko Carstens do_no_context(regs); 370f2c76e3bSHeiko Carstens break; 37150d7280dSMartin Schwidefsky default: /* fault & VM_FAULT_ERROR */ 37299583181SHeiko Carstens if (fault & VM_FAULT_OOM) { 3737d256175SHeiko Carstens if (!user_mode(regs)) 374aa33c8cbSMartin Schwidefsky do_no_context(regs); 37599583181SHeiko Carstens else 37650d7280dSMartin Schwidefsky pagefault_out_of_memory(); 37799583181SHeiko Carstens } else if (fault & VM_FAULT_SIGBUS) { 37850d7280dSMartin Schwidefsky /* Kernel mode? Handle exceptions or die */ 3797d256175SHeiko Carstens if (!user_mode(regs)) 380aa33c8cbSMartin Schwidefsky do_no_context(regs); 38136bf9680SMartin Schwidefsky else 382aa33c8cbSMartin Schwidefsky do_sigbus(regs); 38350d7280dSMartin Schwidefsky } else 38450d7280dSMartin Schwidefsky BUG(); 38550d7280dSMartin Schwidefsky break; 38650d7280dSMartin Schwidefsky } 38750d7280dSMartin Schwidefsky } 38850d7280dSMartin Schwidefsky 3891da177e4SLinus Torvalds /* 3901da177e4SLinus Torvalds * This routine handles page faults. It determines the address, 3911da177e4SLinus Torvalds * and the problem, and then passes it off to one of the appropriate 3921da177e4SLinus Torvalds * routines. 3931da177e4SLinus Torvalds * 39450d7280dSMartin Schwidefsky * interruption code (int_code): 3951da177e4SLinus Torvalds * 04 Protection -> Write-Protection (suprression) 3961da177e4SLinus Torvalds * 10 Segment translation -> Not present (nullification) 3971da177e4SLinus Torvalds * 11 Page translation -> Not present (nullification) 3981da177e4SLinus Torvalds * 3b Region third trans. -> Not present (nullification) 3991da177e4SLinus Torvalds */ 400aa33c8cbSMartin Schwidefsky static inline int do_exception(struct pt_regs *regs, int access) 4011da177e4SLinus Torvalds { 40224eb3a82SDominik Dingel #ifdef CONFIG_PGSTE 40324eb3a82SDominik Dingel struct gmap *gmap; 40424eb3a82SDominik Dingel #endif 4051da177e4SLinus Torvalds struct task_struct *tsk; 4061da177e4SLinus Torvalds struct mm_struct *mm; 4071da177e4SLinus Torvalds struct vm_area_struct *vma; 408aa33c8cbSMartin Schwidefsky unsigned long trans_exc_code; 4091da177e4SLinus Torvalds unsigned long address; 41033ce6140SHeiko Carstens unsigned int flags; 41133ce6140SHeiko Carstens int fault; 41210c1031fSMartin Schwidefsky 41339efd4ecSMartin Schwidefsky tsk = current; 41439efd4ecSMartin Schwidefsky /* 41539efd4ecSMartin Schwidefsky * The instruction that caused the program check has 41639efd4ecSMartin Schwidefsky * been nullified. Don't signal single step via SIGTRAP. 41739efd4ecSMartin Schwidefsky */ 418*d3a73acbSMartin Schwidefsky clear_pt_regs_flag(regs, PIF_PER_TRAP); 41939efd4ecSMartin Schwidefsky 4207ecb344aSMartin Schwidefsky if (notify_page_fault(regs)) 42150d7280dSMartin Schwidefsky return 0; 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds mm = tsk->mm; 424aa33c8cbSMartin Schwidefsky trans_exc_code = regs->int_parm_long; 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds /* 4271da177e4SLinus Torvalds * Verify that the fault happened in user space, that 4281da177e4SLinus Torvalds * we are not in an interrupt and that there is a 4291da177e4SLinus Torvalds * user context. 4301da177e4SLinus Torvalds */ 43150d7280dSMartin Schwidefsky fault = VM_FAULT_BADCONTEXT; 432457f2180SHeiko Carstens if (unlikely(!user_space_fault(regs) || in_atomic() || !mm)) 43350d7280dSMartin Schwidefsky goto out; 4341da177e4SLinus Torvalds 43561365e13SMartin Schwidefsky address = trans_exc_code & __FAIL_ADDR_MASK; 436a8b0ca17SPeter Zijlstra perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address); 437f2c76e3bSHeiko Carstens flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; 438759496baSJohannes Weiner if (user_mode(regs)) 439759496baSJohannes Weiner flags |= FAULT_FLAG_USER; 44033ce6140SHeiko Carstens if (access == VM_WRITE || (trans_exc_code & store_indication) == 0x400) 44133ce6140SHeiko Carstens flags |= FAULT_FLAG_WRITE; 4421da177e4SLinus Torvalds down_read(&mm->mmap_sem); 4431da177e4SLinus Torvalds 444e5992f2eSMartin Schwidefsky #ifdef CONFIG_PGSTE 44524eb3a82SDominik Dingel gmap = (struct gmap *) 44624eb3a82SDominik Dingel ((current->flags & PF_VCPU) ? S390_lowcore.gmap : 0); 44724eb3a82SDominik Dingel if (gmap) { 44824eb3a82SDominik Dingel address = __gmap_fault(address, gmap); 449e5992f2eSMartin Schwidefsky if (address == -EFAULT) { 450e5992f2eSMartin Schwidefsky fault = VM_FAULT_BADMAP; 451e5992f2eSMartin Schwidefsky goto out_up; 452e5992f2eSMartin Schwidefsky } 453e5992f2eSMartin Schwidefsky if (address == -ENOMEM) { 454e5992f2eSMartin Schwidefsky fault = VM_FAULT_OOM; 455e5992f2eSMartin Schwidefsky goto out_up; 456e5992f2eSMartin Schwidefsky } 45724eb3a82SDominik Dingel if (gmap->pfault_enabled) 45824eb3a82SDominik Dingel flags |= FAULT_FLAG_RETRY_NOWAIT; 459e5992f2eSMartin Schwidefsky } 460e5992f2eSMartin Schwidefsky #endif 461e5992f2eSMartin Schwidefsky 462e5992f2eSMartin Schwidefsky retry: 46350d7280dSMartin Schwidefsky fault = VM_FAULT_BADMAP; 4641da177e4SLinus Torvalds vma = find_vma(mm, address); 4651da177e4SLinus Torvalds if (!vma) 46650d7280dSMartin Schwidefsky goto out_up; 467c1821c2eSGerald Schaefer 46850d7280dSMartin Schwidefsky if (unlikely(vma->vm_start > address)) { 4691da177e4SLinus Torvalds if (!(vma->vm_flags & VM_GROWSDOWN)) 47050d7280dSMartin Schwidefsky goto out_up; 4711da177e4SLinus Torvalds if (expand_stack(vma, address)) 47250d7280dSMartin Schwidefsky goto out_up; 47350d7280dSMartin Schwidefsky } 47450d7280dSMartin Schwidefsky 4751da177e4SLinus Torvalds /* 4761da177e4SLinus Torvalds * Ok, we have a good vm_area for this memory access, so 4771da177e4SLinus Torvalds * we can handle it.. 4781da177e4SLinus Torvalds */ 47950d7280dSMartin Schwidefsky fault = VM_FAULT_BADACCESS; 4801ab947deSMartin Schwidefsky if (unlikely(!(vma->vm_flags & access))) 48150d7280dSMartin Schwidefsky goto out_up; 4821da177e4SLinus Torvalds 48353492b1dSGerald Schaefer if (is_vm_hugetlb_page(vma)) 48453492b1dSGerald Schaefer address &= HPAGE_MASK; 4851da177e4SLinus Torvalds /* 4861da177e4SLinus Torvalds * If for any reason at all we couldn't handle the fault, 4871da177e4SLinus Torvalds * make sure we exit gracefully rather than endlessly redo 4881da177e4SLinus Torvalds * the fault. 4891da177e4SLinus Torvalds */ 49033ce6140SHeiko Carstens fault = handle_mm_fault(mm, vma, address, flags); 491f2c76e3bSHeiko Carstens /* No reason to continue if interrupted by SIGKILL. */ 492f2c76e3bSHeiko Carstens if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current)) { 493f2c76e3bSHeiko Carstens fault = VM_FAULT_SIGNAL; 494f2c76e3bSHeiko Carstens goto out; 495f2c76e3bSHeiko Carstens } 49650d7280dSMartin Schwidefsky if (unlikely(fault & VM_FAULT_ERROR)) 49750d7280dSMartin Schwidefsky goto out_up; 49850d7280dSMartin Schwidefsky 49933ce6140SHeiko Carstens /* 50033ce6140SHeiko Carstens * Major/minor page fault accounting is only done on the 50133ce6140SHeiko Carstens * initial attempt. If we go through a retry, it is extremely 50233ce6140SHeiko Carstens * likely that the page will be found in page cache at that point. 50333ce6140SHeiko Carstens */ 50433ce6140SHeiko Carstens if (flags & FAULT_FLAG_ALLOW_RETRY) { 505bde69af2SHeiko Carstens if (fault & VM_FAULT_MAJOR) { 50683c54070SNick Piggin tsk->maj_flt++; 507a8b0ca17SPeter Zijlstra perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, 508bde69af2SHeiko Carstens regs, address); 509bde69af2SHeiko Carstens } else { 51083c54070SNick Piggin tsk->min_flt++; 511a8b0ca17SPeter Zijlstra perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, 512bde69af2SHeiko Carstens regs, address); 513bde69af2SHeiko Carstens } 51433ce6140SHeiko Carstens if (fault & VM_FAULT_RETRY) { 51524eb3a82SDominik Dingel #ifdef CONFIG_PGSTE 51624eb3a82SDominik Dingel if (gmap && (flags & FAULT_FLAG_RETRY_NOWAIT)) { 51724eb3a82SDominik Dingel /* FAULT_FLAG_RETRY_NOWAIT has been set, 51824eb3a82SDominik Dingel * mmap_sem has not been released */ 51924eb3a82SDominik Dingel current->thread.gmap_pfault = 1; 52024eb3a82SDominik Dingel fault = VM_FAULT_PFAULT; 52124eb3a82SDominik Dingel goto out_up; 52224eb3a82SDominik Dingel } 52324eb3a82SDominik Dingel #endif 52433ce6140SHeiko Carstens /* Clear FAULT_FLAG_ALLOW_RETRY to avoid any risk 52533ce6140SHeiko Carstens * of starvation. */ 52624eb3a82SDominik Dingel flags &= ~(FAULT_FLAG_ALLOW_RETRY | 52724eb3a82SDominik Dingel FAULT_FLAG_RETRY_NOWAIT); 52845cac65bSShaohua Li flags |= FAULT_FLAG_TRIED; 529e5992f2eSMartin Schwidefsky down_read(&mm->mmap_sem); 53033ce6140SHeiko Carstens goto retry; 53133ce6140SHeiko Carstens } 53233ce6140SHeiko Carstens } 53350d7280dSMartin Schwidefsky fault = 0; 53450d7280dSMartin Schwidefsky out_up: 5351da177e4SLinus Torvalds up_read(&mm->mmap_sem); 53650d7280dSMartin Schwidefsky out: 53750d7280dSMartin Schwidefsky return fault; 5381da177e4SLinus Torvalds } 5391da177e4SLinus Torvalds 540aa33c8cbSMartin Schwidefsky void __kprobes do_protection_exception(struct pt_regs *regs) 5411da177e4SLinus Torvalds { 542aa33c8cbSMartin Schwidefsky unsigned long trans_exc_code; 54350d7280dSMartin Schwidefsky int fault; 54461365e13SMartin Schwidefsky 545aa33c8cbSMartin Schwidefsky trans_exc_code = regs->int_parm_long; 546f752ac4dSMartin Schwidefsky /* 547f752ac4dSMartin Schwidefsky * Protection exceptions are suppressing, decrement psw address. 548f752ac4dSMartin Schwidefsky * The exception to this rule are aborted transactions, for these 549f752ac4dSMartin Schwidefsky * the PSW already points to the correct location. 550f752ac4dSMartin Schwidefsky */ 551f752ac4dSMartin Schwidefsky if (!(regs->int_code & 0x200)) 552aa33c8cbSMartin Schwidefsky regs->psw.addr = __rewind_psw(regs->psw, regs->int_code >> 16); 55310c1031fSMartin Schwidefsky /* 55410c1031fSMartin Schwidefsky * Check for low-address protection. This needs to be treated 55510c1031fSMartin Schwidefsky * as a special case because the translation exception code 55610c1031fSMartin Schwidefsky * field is not guaranteed to contain valid data in this case. 55710c1031fSMartin Schwidefsky */ 55861365e13SMartin Schwidefsky if (unlikely(!(trans_exc_code & 4))) { 559aa33c8cbSMartin Schwidefsky do_low_address(regs); 56010c1031fSMartin Schwidefsky return; 56110c1031fSMartin Schwidefsky } 562aa33c8cbSMartin Schwidefsky fault = do_exception(regs, VM_WRITE); 56350d7280dSMartin Schwidefsky if (unlikely(fault)) 564aa33c8cbSMartin Schwidefsky do_fault_error(regs, fault); 5651da177e4SLinus Torvalds } 5661da177e4SLinus Torvalds 567aa33c8cbSMartin Schwidefsky void __kprobes do_dat_exception(struct pt_regs *regs) 5681da177e4SLinus Torvalds { 5691ab947deSMartin Schwidefsky int access, fault; 57050d7280dSMartin Schwidefsky 5711ab947deSMartin Schwidefsky access = VM_READ | VM_EXEC | VM_WRITE; 572aa33c8cbSMartin Schwidefsky fault = do_exception(regs, access); 57350d7280dSMartin Schwidefsky if (unlikely(fault)) 574aa33c8cbSMartin Schwidefsky do_fault_error(regs, fault); 5751da177e4SLinus Torvalds } 5761da177e4SLinus Torvalds 5771da177e4SLinus Torvalds #ifdef CONFIG_PFAULT 5781da177e4SLinus Torvalds /* 5791da177e4SLinus Torvalds * 'pfault' pseudo page faults routines. 5801da177e4SLinus Torvalds */ 581fb0a9d7eSHeiko Carstens static int pfault_disable; 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds static int __init nopfault(char *str) 5841da177e4SLinus Torvalds { 5851da177e4SLinus Torvalds pfault_disable = 1; 5861da177e4SLinus Torvalds return 1; 5871da177e4SLinus Torvalds } 5881da177e4SLinus Torvalds 5891da177e4SLinus Torvalds __setup("nopfault", nopfault); 5901da177e4SLinus Torvalds 5917dd8fe1fSHeiko Carstens struct pfault_refbk { 5927dd8fe1fSHeiko Carstens u16 refdiagc; 5937dd8fe1fSHeiko Carstens u16 reffcode; 5947dd8fe1fSHeiko Carstens u16 refdwlen; 5957dd8fe1fSHeiko Carstens u16 refversn; 5967dd8fe1fSHeiko Carstens u64 refgaddr; 5977dd8fe1fSHeiko Carstens u64 refselmk; 5987dd8fe1fSHeiko Carstens u64 refcmpmk; 5997dd8fe1fSHeiko Carstens u64 reserved; 6007dd8fe1fSHeiko Carstens } __attribute__ ((packed, aligned(8))); 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds int pfault_init(void) 6031da177e4SLinus Torvalds { 6047dd8fe1fSHeiko Carstens struct pfault_refbk refbk = { 6057dd8fe1fSHeiko Carstens .refdiagc = 0x258, 6067dd8fe1fSHeiko Carstens .reffcode = 0, 6077dd8fe1fSHeiko Carstens .refdwlen = 5, 6087dd8fe1fSHeiko Carstens .refversn = 2, 6097dd8fe1fSHeiko Carstens .refgaddr = __LC_CURRENT_PID, 6107dd8fe1fSHeiko Carstens .refselmk = 1ULL << 48, 6117dd8fe1fSHeiko Carstens .refcmpmk = 1ULL << 48, 6127dd8fe1fSHeiko Carstens .reserved = __PF_RES_FIELD }; 6131da177e4SLinus Torvalds int rc; 6141da177e4SLinus Torvalds 615f32269a0SCarsten Otte if (pfault_disable) 6161da177e4SLinus Torvalds return -1; 61794c12cc7SMartin Schwidefsky asm volatile( 6181da177e4SLinus Torvalds " diag %1,%0,0x258\n" 6191da177e4SLinus Torvalds "0: j 2f\n" 6201da177e4SLinus Torvalds "1: la %0,8\n" 6211da177e4SLinus Torvalds "2:\n" 62294c12cc7SMartin Schwidefsky EX_TABLE(0b,1b) 623d4b68996SMartin Schwidefsky : "=d" (rc) : "a" (&refbk), "m" (refbk) : "cc"); 6241da177e4SLinus Torvalds return rc; 6251da177e4SLinus Torvalds } 6261da177e4SLinus Torvalds 6271da177e4SLinus Torvalds void pfault_fini(void) 6281da177e4SLinus Torvalds { 6297dd8fe1fSHeiko Carstens struct pfault_refbk refbk = { 6307dd8fe1fSHeiko Carstens .refdiagc = 0x258, 6317dd8fe1fSHeiko Carstens .reffcode = 1, 6327dd8fe1fSHeiko Carstens .refdwlen = 5, 6337dd8fe1fSHeiko Carstens .refversn = 2, 6347dd8fe1fSHeiko Carstens }; 6351da177e4SLinus Torvalds 636f32269a0SCarsten Otte if (pfault_disable) 6371da177e4SLinus Torvalds return; 63894c12cc7SMartin Schwidefsky asm volatile( 6391da177e4SLinus Torvalds " diag %0,0,0x258\n" 6401da177e4SLinus Torvalds "0:\n" 64194c12cc7SMartin Schwidefsky EX_TABLE(0b,0b) 642d4b68996SMartin Schwidefsky : : "a" (&refbk), "m" (refbk) : "cc"); 6431da177e4SLinus Torvalds } 6441da177e4SLinus Torvalds 645f2db2e6cSHeiko Carstens static DEFINE_SPINLOCK(pfault_lock); 646f2db2e6cSHeiko Carstens static LIST_HEAD(pfault_list); 647f2db2e6cSHeiko Carstens 648fde15c3aSHeiko Carstens static void pfault_interrupt(struct ext_code ext_code, 649f6649a7eSMartin Schwidefsky unsigned int param32, unsigned long param64) 6501da177e4SLinus Torvalds { 6511da177e4SLinus Torvalds struct task_struct *tsk; 6521da177e4SLinus Torvalds __u16 subcode; 653f2db2e6cSHeiko Carstens pid_t pid; 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds /* 6561da177e4SLinus Torvalds * Get the external interruption subcode & pfault 6571da177e4SLinus Torvalds * initial/completion signal bit. VM stores this 6581da177e4SLinus Torvalds * in the 'cpu address' field associated with the 6591da177e4SLinus Torvalds * external interrupt. 6601da177e4SLinus Torvalds */ 661fde15c3aSHeiko Carstens subcode = ext_code.subcode; 6621da177e4SLinus Torvalds if ((subcode & 0xff00) != __SUBCODE_MASK) 6631da177e4SLinus Torvalds return; 664420f42ecSHeiko Carstens inc_irq_stat(IRQEXT_PFL); 665f2db2e6cSHeiko Carstens /* Get the token (= pid of the affected task). */ 666f2db2e6cSHeiko Carstens pid = sizeof(void *) == 4 ? param32 : param64; 667f2db2e6cSHeiko Carstens rcu_read_lock(); 668f2db2e6cSHeiko Carstens tsk = find_task_by_pid_ns(pid, &init_pid_ns); 669f2db2e6cSHeiko Carstens if (tsk) 670f2db2e6cSHeiko Carstens get_task_struct(tsk); 671f2db2e6cSHeiko Carstens rcu_read_unlock(); 672f2db2e6cSHeiko Carstens if (!tsk) 673f2db2e6cSHeiko Carstens return; 674f2db2e6cSHeiko Carstens spin_lock(&pfault_lock); 6751da177e4SLinus Torvalds if (subcode & 0x0080) { 6761da177e4SLinus Torvalds /* signal bit is set -> a page has been swapped in by VM */ 677f2db2e6cSHeiko Carstens if (tsk->thread.pfault_wait == 1) { 6781da177e4SLinus Torvalds /* Initial interrupt was faster than the completion 6791da177e4SLinus Torvalds * interrupt. pfault_wait is valid. Set pfault_wait 6801da177e4SLinus Torvalds * back to zero and wake up the process. This can 6811da177e4SLinus Torvalds * safely be done because the task is still sleeping 682b6d09449SMartin Schwidefsky * and can't produce new pfaults. */ 6831da177e4SLinus Torvalds tsk->thread.pfault_wait = 0; 684f2db2e6cSHeiko Carstens list_del(&tsk->thread.list); 6851da177e4SLinus Torvalds wake_up_process(tsk); 686d5e50a51SHeiko Carstens put_task_struct(tsk); 687f2db2e6cSHeiko Carstens } else { 688f2db2e6cSHeiko Carstens /* Completion interrupt was faster than initial 689f2db2e6cSHeiko Carstens * interrupt. Set pfault_wait to -1 so the initial 690fa2fb2f4SHeiko Carstens * interrupt doesn't put the task to sleep. 691fa2fb2f4SHeiko Carstens * If the task is not running, ignore the completion 692fa2fb2f4SHeiko Carstens * interrupt since it must be a leftover of a PFAULT 693fa2fb2f4SHeiko Carstens * CANCEL operation which didn't remove all pending 694fa2fb2f4SHeiko Carstens * completion interrupts. */ 695fa2fb2f4SHeiko Carstens if (tsk->state == TASK_RUNNING) 696f2db2e6cSHeiko Carstens tsk->thread.pfault_wait = -1; 6971da177e4SLinus Torvalds } 6981da177e4SLinus Torvalds } else { 6991da177e4SLinus Torvalds /* signal bit not set -> a real page is missing. */ 700d49f47f8SHeiko Carstens if (WARN_ON_ONCE(tsk != current)) 701d49f47f8SHeiko Carstens goto out; 702d5e50a51SHeiko Carstens if (tsk->thread.pfault_wait == 1) { 703d5e50a51SHeiko Carstens /* Already on the list with a reference: put to sleep */ 7040a16ba78SHeiko Carstens __set_task_state(tsk, TASK_UNINTERRUPTIBLE); 705d5e50a51SHeiko Carstens set_tsk_need_resched(tsk); 706d5e50a51SHeiko Carstens } else if (tsk->thread.pfault_wait == -1) { 7071da177e4SLinus Torvalds /* Completion interrupt was faster than the initial 708f2db2e6cSHeiko Carstens * interrupt (pfault_wait == -1). Set pfault_wait 709f2db2e6cSHeiko Carstens * back to zero and exit. */ 7101da177e4SLinus Torvalds tsk->thread.pfault_wait = 0; 711f2db2e6cSHeiko Carstens } else { 712f2db2e6cSHeiko Carstens /* Initial interrupt arrived before completion 713d5e50a51SHeiko Carstens * interrupt. Let the task sleep. 714d5e50a51SHeiko Carstens * An extra task reference is needed since a different 715d5e50a51SHeiko Carstens * cpu may set the task state to TASK_RUNNING again 716d5e50a51SHeiko Carstens * before the scheduler is reached. */ 717d5e50a51SHeiko Carstens get_task_struct(tsk); 718f2db2e6cSHeiko Carstens tsk->thread.pfault_wait = 1; 719f2db2e6cSHeiko Carstens list_add(&tsk->thread.list, &pfault_list); 7200a16ba78SHeiko Carstens __set_task_state(tsk, TASK_UNINTERRUPTIBLE); 7211da177e4SLinus Torvalds set_tsk_need_resched(tsk); 7221da177e4SLinus Torvalds } 7231da177e4SLinus Torvalds } 724d49f47f8SHeiko Carstens out: 725f2db2e6cSHeiko Carstens spin_unlock(&pfault_lock); 72654c27791SHeiko Carstens put_task_struct(tsk); 727f2db2e6cSHeiko Carstens } 728f2db2e6cSHeiko Carstens 729e2741f17SPaul Gortmaker static int pfault_cpu_notify(struct notifier_block *self, unsigned long action, 730e2741f17SPaul Gortmaker void *hcpu) 731f2db2e6cSHeiko Carstens { 732f2db2e6cSHeiko Carstens struct thread_struct *thread, *next; 733f2db2e6cSHeiko Carstens struct task_struct *tsk; 734f2db2e6cSHeiko Carstens 7351c725922SHeiko Carstens switch (action & ~CPU_TASKS_FROZEN) { 736f2db2e6cSHeiko Carstens case CPU_DEAD: 737f2db2e6cSHeiko Carstens spin_lock_irq(&pfault_lock); 738f2db2e6cSHeiko Carstens list_for_each_entry_safe(thread, next, &pfault_list, list) { 739f2db2e6cSHeiko Carstens thread->pfault_wait = 0; 740f2db2e6cSHeiko Carstens list_del(&thread->list); 741f2db2e6cSHeiko Carstens tsk = container_of(thread, struct task_struct, thread); 742f2db2e6cSHeiko Carstens wake_up_process(tsk); 743d5e50a51SHeiko Carstens put_task_struct(tsk); 744f2db2e6cSHeiko Carstens } 745f2db2e6cSHeiko Carstens spin_unlock_irq(&pfault_lock); 746f2db2e6cSHeiko Carstens break; 747f2db2e6cSHeiko Carstens default: 748f2db2e6cSHeiko Carstens break; 749f2db2e6cSHeiko Carstens } 750f2db2e6cSHeiko Carstens return NOTIFY_OK; 751f2db2e6cSHeiko Carstens } 7521da177e4SLinus Torvalds 753fb0a9d7eSHeiko Carstens static int __init pfault_irq_init(void) 75429b08d2bSHeiko Carstens { 755fb0a9d7eSHeiko Carstens int rc; 75629b08d2bSHeiko Carstens 7571dad093bSThomas Huth rc = register_external_irq(EXT_IRQ_CP_SERVICE, pfault_interrupt); 7587dd8fe1fSHeiko Carstens if (rc) 7597dd8fe1fSHeiko Carstens goto out_extint; 7607dd8fe1fSHeiko Carstens rc = pfault_init() == 0 ? 0 : -EOPNOTSUPP; 7617dd8fe1fSHeiko Carstens if (rc) 7627dd8fe1fSHeiko Carstens goto out_pfault; 76382003c3eSHeiko Carstens irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL); 7647dd8fe1fSHeiko Carstens hotcpu_notifier(pfault_cpu_notify, 0); 7657dd8fe1fSHeiko Carstens return 0; 7667dd8fe1fSHeiko Carstens 7677dd8fe1fSHeiko Carstens out_pfault: 7681dad093bSThomas Huth unregister_external_irq(EXT_IRQ_CP_SERVICE, pfault_interrupt); 7697dd8fe1fSHeiko Carstens out_extint: 770fb0a9d7eSHeiko Carstens pfault_disable = 1; 771fb0a9d7eSHeiko Carstens return rc; 772fb0a9d7eSHeiko Carstens } 773fb0a9d7eSHeiko Carstens early_initcall(pfault_irq_init); 774fb0a9d7eSHeiko Carstens 7757dd8fe1fSHeiko Carstens #endif /* CONFIG_PFAULT */ 776