diff options
Diffstat (limited to 'arch/ia64/kernel/process.c')
| -rw-r--r-- | arch/ia64/kernel/process.c | 683 |
1 files changed, 0 insertions, 683 deletions
diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c deleted file mode 100644 index 968b5f33e725..000000000000 --- a/arch/ia64/kernel/process.c +++ /dev/null @@ -1,683 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Architecture-specific setup. - * - * Copyright (C) 1998-2003 Hewlett-Packard Co - * David Mosberger-Tang <davidm@hpl.hp.com> - * 04/11/17 Ashok Raj <ashok.raj@intel.com> Added CPU Hotplug Support - * - * 2005-10-07 Keith Owens <kaos@sgi.com> - * Add notify_die() hooks. - */ -#include <linux/cpu.h> -#include <linux/pm.h> -#include <linux/elf.h> -#include <linux/errno.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/slab.h> -#include <linux/module.h> -#include <linux/notifier.h> -#include <linux/personality.h> -#include <linux/sched.h> -#include <linux/sched/debug.h> -#include <linux/sched/hotplug.h> -#include <linux/sched/task.h> -#include <linux/sched/task_stack.h> -#include <linux/stddef.h> -#include <linux/thread_info.h> -#include <linux/unistd.h> -#include <linux/efi.h> -#include <linux/interrupt.h> -#include <linux/delay.h> -#include <linux/kdebug.h> -#include <linux/utsname.h> -#include <linux/tracehook.h> -#include <linux/rcupdate.h> - -#include <asm/cpu.h> -#include <asm/delay.h> -#include <asm/elf.h> -#include <asm/irq.h> -#include <asm/kexec.h> -#include <asm/pgalloc.h> -#include <asm/processor.h> -#include <asm/sal.h> -#include <asm/switch_to.h> -#include <asm/tlbflush.h> -#include <linux/uaccess.h> -#include <asm/unwind.h> -#include <asm/user.h> - -#include "entry.h" - -#ifdef CONFIG_PERFMON -# include <asm/perfmon.h> -#endif - -#include "sigframe.h" - -void (*ia64_mark_idle)(int); - -unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE; -EXPORT_SYMBOL(boot_option_idle_override); -void (*pm_power_off) (void); -EXPORT_SYMBOL(pm_power_off); - -void -ia64_do_show_stack (struct unw_frame_info *info, void *arg) -{ - unsigned long ip, sp, bsp; - - printk("\nCall Trace:\n"); - do { - unw_get_ip(info, &ip); - if (ip == 0) - break; - - unw_get_sp(info, &sp); - unw_get_bsp(info, &bsp); - printk(" [<%016lx>] %pS\n" - " sp=%016lx bsp=%016lx\n", - ip, (void *)ip, sp, bsp); - } while (unw_unwind(info) >= 0); -} - -void -show_stack (struct task_struct *task, unsigned long *sp) -{ - if (!task) - unw_init_running(ia64_do_show_stack, NULL); - else { - struct unw_frame_info info; - - unw_init_from_blocked_task(&info, task); - ia64_do_show_stack(&info, NULL); - } -} - -void -show_regs (struct pt_regs *regs) -{ - unsigned long ip = regs->cr_iip + ia64_psr(regs)->ri; - - print_modules(); - printk("\n"); - show_regs_print_info(KERN_DEFAULT); - printk("psr : %016lx ifs : %016lx ip : [<%016lx>] %s (%s)\n", - regs->cr_ipsr, regs->cr_ifs, ip, print_tainted(), - init_utsname()->release); - printk("ip is at %pS\n", (void *)ip); - printk("unat: %016lx pfs : %016lx rsc : %016lx\n", - regs->ar_unat, regs->ar_pfs, regs->ar_rsc); - printk("rnat: %016lx bsps: %016lx pr : %016lx\n", - regs->ar_rnat, regs->ar_bspstore, regs->pr); - printk("ldrs: %016lx ccv : %016lx fpsr: %016lx\n", - regs->loadrs, regs->ar_ccv, regs->ar_fpsr); - printk("csd : %016lx ssd : %016lx\n", regs->ar_csd, regs->ar_ssd); - printk("b0 : %016lx b6 : %016lx b7 : %016lx\n", regs->b0, regs->b6, regs->b7); - printk("f6 : %05lx%016lx f7 : %05lx%016lx\n", - regs->f6.u.bits[1], regs->f6.u.bits[0], - regs->f7.u.bits[1], regs->f7.u.bits[0]); - printk("f8 : %05lx%016lx f9 : %05lx%016lx\n", - regs->f8.u.bits[1], regs->f8.u.bits[0], - regs->f9.u.bits[1], regs->f9.u.bits[0]); - printk("f10 : %05lx%016lx f11 : %05lx%016lx\n", - regs->f10.u.bits[1], regs->f10.u.bits[0], - regs->f11.u.bits[1], regs->f11.u.bits[0]); - - printk("r1 : %016lx r2 : %016lx r3 : %016lx\n", regs->r1, regs->r2, regs->r3); - printk("r8 : %016lx r9 : %016lx r10 : %016lx\n", regs->r8, regs->r9, regs->r10); - printk("r11 : %016lx r12 : %016lx r13 : %016lx\n", regs->r11, regs->r12, regs->r13); - printk("r14 : %016lx r15 : %016lx r16 : %016lx\n", regs->r14, regs->r15, regs->r16); - printk("r17 : %016lx r18 : %016lx r19 : %016lx\n", regs->r17, regs->r18, regs->r19); - printk("r20 : %016lx r21 : %016lx r22 : %016lx\n", regs->r20, regs->r21, regs->r22); - printk("r23 : %016lx r24 : %016lx r25 : %016lx\n", regs->r23, regs->r24, regs->r25); - printk("r26 : %016lx r27 : %016lx r28 : %016lx\n", regs->r26, regs->r27, regs->r28); - printk("r29 : %016lx r30 : %016lx r31 : %016lx\n", regs->r29, regs->r30, regs->r31); - - if (user_mode(regs)) { - /* print the stacked registers */ - unsigned long val, *bsp, ndirty; - int i, sof, is_nat = 0; - - sof = regs->cr_ifs & 0x7f; /* size of frame */ - ndirty = (regs->loadrs >> 19); - bsp = ia64_rse_skip_regs((unsigned long *) regs->ar_bspstore, ndirty); - for (i = 0; i < sof; ++i) { - get_user(val, (unsigned long __user *) ia64_rse_skip_regs(bsp, i)); - printk("r%-3u:%c%016lx%s", 32 + i, is_nat ? '*' : ' ', val, - ((i == sof - 1) || (i % 3) == 2) ? "\n" : " "); - } - } else - show_stack(NULL, NULL); -} - -/* local support for deprecated console_print */ -void -console_print(const char *s) -{ - printk(KERN_EMERG "%s", s); -} - -void -do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall) -{ - if (fsys_mode(current, &scr->pt)) { - /* - * defer signal-handling etc. until we return to - * privilege-level 0. - */ - if (!ia64_psr(&scr->pt)->lp) - ia64_psr(&scr->pt)->lp = 1; - return; - } - -#ifdef CONFIG_PERFMON - if (current->thread.pfm_needs_checking) - /* - * Note: pfm_handle_work() allow us to call it with interrupts - * disabled, and may enable interrupts within the function. - */ - pfm_handle_work(); -#endif - - /* deal with pending signal delivery */ - if (test_thread_flag(TIF_SIGPENDING)) { - local_irq_enable(); /* force interrupt enable */ - ia64_do_signal(scr, in_syscall); - } - - if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) { - local_irq_enable(); /* force interrupt enable */ - tracehook_notify_resume(&scr->pt); - } - - /* copy user rbs to kernel rbs */ - if (unlikely(test_thread_flag(TIF_RESTORE_RSE))) { - local_irq_enable(); /* force interrupt enable */ - ia64_sync_krbs(); - } - - local_irq_disable(); /* force interrupt disable */ -} - -static int __init nohalt_setup(char * str) -{ - cpu_idle_poll_ctrl(true); - return 1; -} -__setup("nohalt", nohalt_setup); - -#ifdef CONFIG_HOTPLUG_CPU -/* We don't actually take CPU down, just spin without interrupts. */ -static inline void play_dead(void) -{ - unsigned int this_cpu = smp_processor_id(); - - /* Ack it */ - __this_cpu_write(cpu_state, CPU_DEAD); - - max_xtp(); - local_irq_disable(); - idle_task_exit(); - ia64_jump_to_sal(&sal_boot_rendez_state[this_cpu]); - /* - * The above is a point of no-return, the processor is - * expected to be in SAL loop now. - */ - BUG(); -} -#else -static inline void play_dead(void) -{ - BUG(); -} -#endif /* CONFIG_HOTPLUG_CPU */ - -void arch_cpu_idle_dead(void) -{ - play_dead(); -} - -void arch_cpu_idle(void) -{ - void (*mark_idle)(int) = ia64_mark_idle; - -#ifdef CONFIG_SMP - min_xtp(); -#endif - rmb(); - if (mark_idle) - (*mark_idle)(1); - - safe_halt(); - - if (mark_idle) - (*mark_idle)(0); -#ifdef CONFIG_SMP - normal_xtp(); -#endif -} - -void -ia64_save_extra (struct task_struct *task) -{ -#ifdef CONFIG_PERFMON - unsigned long info; -#endif - - if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0) - ia64_save_debug_regs(&task->thread.dbr[0]); - -#ifdef CONFIG_PERFMON - if ((task->thread.flags & IA64_THREAD_PM_VALID) != 0) - pfm_save_regs(task); - - info = __this_cpu_read(pfm_syst_info); - if (info & PFM_CPUINFO_SYST_WIDE) - pfm_syst_wide_update_task(task, info, 0); -#endif -} - -void -ia64_load_extra (struct task_struct *task) -{ -#ifdef CONFIG_PERFMON - unsigned long info; -#endif - - if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0) - ia64_load_debug_regs(&task->thread.dbr[0]); - -#ifdef CONFIG_PERFMON - if ((task->thread.flags & IA64_THREAD_PM_VALID) != 0) - pfm_load_regs(task); - - info = __this_cpu_read(pfm_syst_info); - if (info & PFM_CPUINFO_SYST_WIDE) - pfm_syst_wide_update_task(task, info, 1); -#endif -} - -/* - * Copy the state of an ia-64 thread. - * - * We get here through the following call chain: - * - * from user-level: from kernel: - * - * <clone syscall> <some kernel call frames> - * sys_clone : - * do_fork do_fork - * copy_thread copy_thread - * - * This means that the stack layout is as follows: - * - * +---------------------+ (highest addr) - * | struct pt_regs | - * +---------------------+ - * | struct switch_stack | - * +---------------------+ - * | | - * | memory stack | - * | | <-- sp (lowest addr) - * +---------------------+ - * - * Observe that we copy the unat values that are in pt_regs and switch_stack. Spilling an - * integer to address X causes bit N in ar.unat to be set to the NaT bit of the register, - * with N=(X & 0x1ff)/8. Thus, copying the unat value preserves the NaT bits ONLY if the - * pt_regs structure in the parent is congruent to that of the child, modulo 512. Since - * the stack is page aligned and the page size is at least 4KB, this is always the case, - * so there is nothing to worry about. - */ -int -copy_thread(unsigned long clone_flags, - unsigned long user_stack_base, unsigned long user_stack_size, - struct task_struct *p) -{ - extern char ia64_ret_from_clone; - struct switch_stack *child_stack, *stack; - unsigned long rbs, child_rbs, rbs_size; - struct pt_regs *child_ptregs; - struct pt_regs *regs = current_pt_regs(); - int retval = 0; - - child_ptregs = (struct pt_regs *) ((unsigned long) p + IA64_STK_OFFSET) - 1; - child_stack = (struct switch_stack *) child_ptregs - 1; - - rbs = (unsigned long) current + IA64_RBS_OFFSET; - child_rbs = (unsigned long) p + IA64_RBS_OFFSET; - - /* copy parts of thread_struct: */ - p->thread.ksp = (unsigned long) child_stack - 16; - - /* - * NOTE: The calling convention considers all floating point - * registers in the high partition (fph) to be scratch. Since - * the only way to get to this point is through a system call, - * we know that the values in fph are all dead. Hence, there - * is no need to inherit the fph state from the parent to the - * child and all we have to do is to make sure that - * IA64_THREAD_FPH_VALID is cleared in the child. - * - * XXX We could push this optimization a bit further by - * clearing IA64_THREAD_FPH_VALID on ANY system call. - * However, it's not clear this is worth doing. Also, it - * would be a slight deviation from the normal Linux system - * call behavior where scratch registers are preserved across - * system calls (unless used by the system call itself). - */ -# define THREAD_FLAGS_TO_CLEAR (IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID \ - | IA64_THREAD_PM_VALID) -# define THREAD_FLAGS_TO_SET 0 - p->thread.flags = ((current->thread.flags & ~THREAD_FLAGS_TO_CLEAR) - | THREAD_FLAGS_TO_SET); - - ia64_drop_fpu(p); /* don't pick up stale state from a CPU's fph */ - - if (unlikely(p->flags & PF_KTHREAD)) { - if (unlikely(!user_stack_base)) { - /* fork_idle() called us */ - return 0; - } - memset(child_stack, 0, sizeof(*child_ptregs) + sizeof(*child_stack)); - child_stack->r4 = user_stack_base; /* payload */ - child_stack->r5 = user_stack_size; /* argument */ - /* - * Preserve PSR bits, except for bits 32-34 and 37-45, - * which we can't read. - */ - child_ptregs->cr_ipsr = ia64_getreg(_IA64_REG_PSR) | IA64_PSR_BN; - /* mark as valid, empty frame */ - child_ptregs->cr_ifs = 1UL << 63; - child_stack->ar_fpsr = child_ptregs->ar_fpsr - = ia64_getreg(_IA64_REG_AR_FPSR); - child_stack->pr = (1 << PRED_KERNEL_STACK); - child_stack->ar_bspstore = child_rbs; - child_stack->b0 = (unsigned long) &ia64_ret_from_clone; - - /* stop some PSR bits from being inherited. - * the psr.up/psr.pp bits must be cleared on fork but inherited on execve() - * therefore we must specify them explicitly here and not include them in - * IA64_PSR_BITS_TO_CLEAR. - */ - child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET) - & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP)); - - return 0; - } - stack = ((struct switch_stack *) regs) - 1; - /* copy parent's switch_stack & pt_regs to child: */ - memcpy(child_stack, stack, sizeof(*child_ptregs) + sizeof(*child_stack)); - - /* copy the parent's register backing store to the child: */ - rbs_size = stack->ar_bspstore - rbs; - memcpy((void *) child_rbs, (void *) rbs, rbs_size); - if (clone_flags & CLONE_SETTLS) - child_ptregs->r13 = regs->r16; /* see sys_clone2() in entry.S */ - if (user_stack_base) { - child_ptregs->r12 = user_stack_base + user_stack_size - 16; - child_ptregs->ar_bspstore = user_stack_base; - child_ptregs->ar_rnat = 0; - child_ptregs->loadrs = 0; - } - child_stack->ar_bspstore = child_rbs + rbs_size; - child_stack->b0 = (unsigned long) &ia64_ret_from_clone; - - /* stop some PSR bits from being inherited. - * the psr.up/psr.pp bits must be cleared on fork but inherited on execve() - * therefore we must specify them explicitly here and not include them in - * IA64_PSR_BITS_TO_CLEAR. - */ - child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET) - & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP)); - -#ifdef CONFIG_PERFMON - if (current->thread.pfm_context) - pfm_inherit(p, child_ptregs); -#endif - return retval; -} - -static void -do_copy_task_regs (struct task_struct *task, struct unw_frame_info *info, void *arg) -{ - unsigned long mask, sp, nat_bits = 0, ar_rnat, urbs_end, cfm; - unsigned long uninitialized_var(ip); /* GCC be quiet */ - elf_greg_t *dst = arg; - struct pt_regs *pt; - char nat; - int i; - - memset(dst, 0, sizeof(elf_gregset_t)); /* don't leak any kernel bits to user-level */ - - if (unw_unwind_to_user(info) < 0) - return; - - unw_get_sp(info, &sp); - pt = (struct pt_regs *) (sp + 16); - - urbs_end = ia64_get_user_rbs_end(task, pt, &cfm); - - if (ia64_sync_user_rbs(task, info->sw, pt->ar_bspstore, urbs_end) < 0) - return; - - ia64_peek(task, info->sw, urbs_end, (long) ia64_rse_rnat_addr((long *) urbs_end), - &ar_rnat); - - /* - * coredump format: - * r0-r31 - * NaT bits (for r0-r31; bit N == 1 iff rN is a NaT) - * predicate registers (p0-p63) - * b0-b7 - * ip cfm user-mask - * ar.rsc ar.bsp ar.bspstore ar.rnat - * ar.ccv ar.unat ar.fpsr ar.pfs ar.lc ar.ec - */ - - /* r0 is zero */ - for (i = 1, mask = (1UL << i); i < 32; ++i) { - unw_get_gr(info, i, &dst[i], &nat); - if (nat) - nat_bits |= mask; - mask <<= 1; - } - dst[32] = nat_bits; - unw_get_pr(info, &dst[33]); - - for (i = 0; i < 8; ++i) - unw_get_br(info, i, &dst[34 + i]); - - unw_get_rp(info, &ip); - dst[42] = ip + ia64_psr(pt)->ri; - dst[43] = cfm; - dst[44] = pt->cr_ipsr & IA64_PSR_UM; - - unw_get_ar(info, UNW_AR_RSC, &dst[45]); - /* - * For bsp and bspstore, unw_get_ar() would return the kernel - * addresses, but we need the user-level addresses instead: - */ - dst[46] = urbs_end; /* note: by convention PT_AR_BSP points to the end of the urbs! */ - dst[47] = pt->ar_bspstore; - dst[48] = ar_rnat; - unw_get_ar(info, UNW_AR_CCV, &dst[49]); - unw_get_ar(info, UNW_AR_UNAT, &dst[50]); - unw_get_ar(info, UNW_AR_FPSR, &dst[51]); - dst[52] = pt->ar_pfs; /* UNW_AR_PFS is == to pt->cr_ifs for interrupt frames */ - unw_get_ar(info, UNW_AR_LC, &dst[53]); - unw_get_ar(info, UNW_AR_EC, &dst[54]); - unw_get_ar(info, UNW_AR_CSD, &dst[55]); - unw_get_ar(info, UNW_AR_SSD, &dst[56]); -} - -void -do_dump_task_fpu (struct task_struct *task, struct unw_frame_info *info, void *arg) -{ - elf_fpreg_t *dst = arg; - int i; - - memset(dst, 0, sizeof(elf_fpregset_t)); /* don't leak any "random" bits */ - - if (unw_unwind_to_user(info) < 0) - return; - - /* f0 is 0.0, f1 is 1.0 */ - - for (i = 2; i < 32; ++i) - unw_get_fr(info, i, dst + i); - - ia64_flush_fph(task); - if ((task->thread.flags & IA64_THREAD_FPH_VALID) != 0) - memcpy(dst + 32, task->thread.fph, 96*16); -} - -void -do_copy_regs (struct unw_frame_info *info, void *arg) -{ - do_copy_task_regs(current, info, arg); -} - -void -do_dump_fpu (struct unw_frame_info *info, void *arg) -{ - do_dump_task_fpu(current, info, arg); -} - -void -ia64_elf_core_copy_regs (struct pt_regs *pt, elf_gregset_t dst) -{ - unw_init_running(do_copy_regs, dst); -} - -int -dump_fpu (struct pt_regs *pt, elf_fpregset_t dst) -{ - unw_init_running(do_dump_fpu, dst); - return 1; /* f0-f31 are always valid so we always return 1 */ -} - -/* - * Flush thread state. This is called when a thread does an execve(). - */ -void -flush_thread (void) -{ - /* drop floating-point and debug-register state if it exists: */ - current->thread.flags &= ~(IA64_THREAD_FPH_VALID | IA64_THREAD_DBG_VALID); - ia64_drop_fpu(current); -} - -/* - * Clean up state associated with a thread. This is called when - * the thread calls exit(). - */ -void -exit_thread (struct task_struct *tsk) -{ - - ia64_drop_fpu(tsk); -#ifdef CONFIG_PERFMON - /* if needed, stop monitoring and flush state to perfmon context */ - if (tsk->thread.pfm_context) - pfm_exit_thread(tsk); - - /* free debug register resources */ - if (tsk->thread.flags & IA64_THREAD_DBG_VALID) - pfm_release_debug_registers(tsk); -#endif -} - -unsigned long -get_wchan (struct task_struct *p) -{ - struct unw_frame_info info; - unsigned long ip; - int count = 0; - - if (!p || p == current || p->state == TASK_RUNNING) - return 0; - - /* - * Note: p may not be a blocked task (it could be current or - * another process running on some other CPU. Rather than - * trying to determine if p is really blocked, we just assume - * it's blocked and rely on the unwind routines to fail - * gracefully if the process wasn't really blocked after all. - * --davidm 99/12/15 - */ - unw_init_from_blocked_task(&info, p); - do { - if (p->state == TASK_RUNNING) - return 0; - if (unw_unwind(&info) < 0) - return 0; - unw_get_ip(&info, &ip); - if (!in_sched_functions(ip)) - return ip; - } while (count++ < 16); - return 0; -} - -void -cpu_halt (void) -{ - pal_power_mgmt_info_u_t power_info[8]; - unsigned long min_power; - int i, min_power_state; - - if (ia64_pal_halt_info(power_info) != 0) - return; - - min_power_state = 0; - min_power = power_info[0].pal_power_mgmt_info_s.power_consumption; - for (i = 1; i < 8; ++i) - if (power_info[i].pal_power_mgmt_info_s.im - && power_info[i].pal_power_mgmt_info_s.power_consumption < min_power) { - min_power = power_info[i].pal_power_mgmt_info_s.power_consumption; - min_power_state = i; - } - - while (1) - ia64_pal_halt(min_power_state); -} - -void machine_shutdown(void) -{ -#ifdef CONFIG_HOTPLUG_CPU - int cpu; - - for_each_online_cpu(cpu) { - if (cpu != smp_processor_id()) - cpu_down(cpu); - } -#endif -#ifdef CONFIG_KEXEC - kexec_disable_iosapic(); -#endif -} - -void -machine_restart (char *restart_cmd) -{ - (void) notify_die(DIE_MACHINE_RESTART, restart_cmd, NULL, 0, 0, 0); - efi_reboot(REBOOT_WARM, NULL); -} - -void -machine_halt (void) -{ - (void) notify_die(DIE_MACHINE_HALT, "", NULL, 0, 0, 0); - cpu_halt(); -} - -void -machine_power_off (void) -{ - if (pm_power_off) - pm_power_off(); - machine_halt(); -} - |