Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 611 insertions, 0 deletions

diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
new file mode 100644
index 0000000000..9a5cd9fad3
--- /dev/null
+++ b/arch/ia64/kernel/process.c
@@ -0,0 +1,611 @@
+// 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/reboot.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/resume_user_mode.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/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 <asm/xtp.h>
+
+#include "entry.h"
+
+#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);
+
+static void
+ia64_do_show_stack (struct unw_frame_info *info, void *arg)
+{
+	unsigned long ip, sp, bsp;
+	const char *loglvl = arg;
+
+	printk("%s\nCall Trace:\n", loglvl);
+	do {
+		unw_get_ip(info, &ip);
+		if (ip == 0)
+			break;
+
+		unw_get_sp(info, &sp);
+		unw_get_bsp(info, &bsp);
+		printk("%s [<%016lx>] %pS\n"
+			 "                                sp=%016lx bsp=%016lx\n",
+			 loglvl, ip, (void *)ip, sp, bsp);
+	} while (unw_unwind(info) >= 0);
+}
+
+void
+show_stack (struct task_struct *task, unsigned long *sp, const char *loglvl)
+{
+	if (!task)
+		unw_init_running(ia64_do_show_stack, (void *)loglvl);
+	else {
+		struct unw_frame_info info;
+
+		unw_init_from_blocked_task(&info, task);
+		ia64_do_show_stack(&info, (void *)loglvl);
+	}
+}
+
+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, KERN_DEFAULT);
+}
+
+/* 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;
+	}
+
+	/* deal with pending signal delivery */
+	if (test_thread_flag(TIF_SIGPENDING) ||
+	    test_thread_flag(TIF_NOTIFY_SIGNAL)) {
+		local_irq_enable();	/* force interrupt enable */
+		ia64_do_signal(scr, in_syscall);
+	}
+
+	if (test_thread_flag(TIF_NOTIFY_RESUME)) {
+		local_irq_enable();	/* force interrupt enable */
+		resume_user_mode_work(&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 __noreturn 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 __noreturn play_dead(void)
+{
+	BUG();
+}
+#endif /* CONFIG_HOTPLUG_CPU */
+
+void __noreturn 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);
+
+	raw_safe_halt();
+	raw_local_irq_disable();
+
+	if (mark_idle)
+		(*mark_idle)(0);
+#ifdef CONFIG_SMP
+	normal_xtp();
+#endif
+}
+
+void
+ia64_save_extra (struct task_struct *task)
+{
+	if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0)
+		ia64_save_debug_regs(&task->thread.dbr[0]);
+}
+
+void
+ia64_load_extra (struct task_struct *task)
+{
+	if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0)
+		ia64_load_debug_regs(&task->thread.dbr[0]);
+}
+
+/*
+ * 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		   :
+ *	kernel_clone		kernel_clone
+ *	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(struct task_struct *p, const struct kernel_clone_args *args)
+{
+	unsigned long clone_flags = args->flags;
+	unsigned long user_stack_base = args->stack;
+	unsigned long user_stack_size = args->stack_size;
+	unsigned long tls = args->tls;
+	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(args->fn)) {
+		if (unlikely(args->idle)) {
+			/* fork_idle() called us */
+			return 0;
+		}
+		memset(child_stack, 0, sizeof(*child_ptregs) + sizeof(*child_stack));
+		child_stack->r4 = (unsigned long) args->fn;
+		child_stack->r5 = (unsigned long) args->fn_arg;
+		/*
+		 * 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 = tls;
+	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));
+	return retval;
+}
+
+asmlinkage long ia64_clone(unsigned long clone_flags, unsigned long stack_start,
+			   unsigned long stack_size, unsigned long parent_tidptr,
+			   unsigned long child_tidptr, unsigned long tls)
+{
+	struct kernel_clone_args args = {
+		.flags		= (lower_32_bits(clone_flags) & ~CSIGNAL),
+		.pidfd		= (int __user *)parent_tidptr,
+		.child_tid	= (int __user *)child_tidptr,
+		.parent_tid	= (int __user *)parent_tidptr,
+		.exit_signal	= (lower_32_bits(clone_flags) & CSIGNAL),
+		.stack		= stack_start,
+		.stack_size	= stack_size,
+		.tls		= tls,
+	};
+
+	return kernel_clone(&args);
+}
+
+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 ip;
+	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]);
+}
+
+static void
+do_copy_regs (struct unw_frame_info *info, void *arg)
+{
+	do_copy_task_regs(current, info, arg);
+}
+
+void
+ia64_elf_core_copy_regs (struct pt_regs *pt, elf_gregset_t dst)
+{
+	unw_init_running(do_copy_regs, dst);
+}
+
+/*
+ * 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);
+}
+
+unsigned long
+__get_wchan (struct task_struct *p)
+{
+	struct unw_frame_info info;
+	unsigned long ip;
+	int count = 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 (task_is_running(p))
+			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)
+{
+	smp_shutdown_nonboot_cpus(reboot_cpu);
+
+#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)
+{
+	do_kernel_power_off();
+	machine_halt();
+}
+
+EXPORT_SYMBOL(ia64_delay_loop);