17 files changed, 186 insertions, 56 deletions

diff --git a/arch/csky/kernel/Makefile b/arch/csky/kernel/Makefile
index 6c0f36010ed0..8a868316b912 100644
--- a/arch/csky/kernel/Makefile
+++ b/arch/csky/kernel/Makefile
@@ -1,8 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0-only
-extra-y := head.o vmlinux.lds
+extra-y := vmlinux.lds
 
-obj-y += entry.o atomic.o signal.o traps.o irq.o time.o vdso.o vdso/
-obj-y += power.o syscall.o syscall_table.o setup.o
+obj-y += head.o entry.o atomic.o signal.o traps.o irq.o time.o vdso.o vdso/
+obj-y += power.o syscall.o syscall_table.o setup.o io.o
 obj-y += process.o cpu-probe.o ptrace.o stacktrace.o
 obj-y += probes/
 
@@ -13,6 +13,7 @@ obj-$(CONFIG_STACKTRACE)		+= stacktrace.o
 obj-$(CONFIG_CSKY_PMU_V1)		+= perf_event.o
 obj-$(CONFIG_PERF_EVENTS)		+= perf_callchain.o
 obj-$(CONFIG_HAVE_PERF_REGS)            += perf_regs.o
+obj-$(CONFIG_JUMP_LABEL)		+= jump_label.o
 
 ifdef CONFIG_FUNCTION_TRACER
 CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE)
diff --git a/arch/csky/kernel/asm-offsets.c b/arch/csky/kernel/asm-offsets.c
index 1cbcba4b0dd1..d1e903579473 100644
--- a/arch/csky/kernel/asm-offsets.c
+++ b/arch/csky/kernel/asm-offsets.c
@@ -25,7 +25,6 @@ int main(void)
 	/* offsets into the thread_info struct */
 	DEFINE(TINFO_FLAGS,       offsetof(struct thread_info, flags));
 	DEFINE(TINFO_PREEMPT,     offsetof(struct thread_info, preempt_count));
-	DEFINE(TINFO_ADDR_LIMIT,  offsetof(struct thread_info, addr_limit));
 	DEFINE(TINFO_TP_VALUE,   offsetof(struct thread_info, tp_value));
 	DEFINE(TINFO_TASK,        offsetof(struct thread_info, task));
 
diff --git a/arch/csky/kernel/entry.S b/arch/csky/kernel/entry.S
index a4ababf25e24..547b4cd1b24b 100644
--- a/arch/csky/kernel/entry.S
+++ b/arch/csky/kernel/entry.S
@@ -19,11 +19,11 @@
 .endm
 
 .macro	context_tracking
-#ifdef CONFIG_CONTEXT_TRACKING
+#ifdef CONFIG_CONTEXT_TRACKING_USER
 	mfcr	a0, epsr
 	btsti	a0, 31
 	bt	1f
-	jbsr	context_tracking_user_exit
+	jbsr	user_exit_callable
 	ldw	a0, (sp, LSAVE_A0)
 	ldw	a1, (sp, LSAVE_A1)
 	ldw	a2, (sp, LSAVE_A2)
@@ -159,8 +159,8 @@ ret_from_exception:
 	and	r10, r9
 	cmpnei	r10, 0
 	bt	exit_work
-#ifdef CONFIG_CONTEXT_TRACKING
-	jbsr	context_tracking_user_enter
+#ifdef CONFIG_CONTEXT_TRACKING_USER
+	jbsr	user_enter_callable
 #endif
 1:
 #ifdef CONFIG_PREEMPTION
diff --git a/arch/csky/kernel/io.c b/arch/csky/kernel/io.c
new file mode 100644
index 000000000000..5883f13fa2b1
--- /dev/null
+++ b/arch/csky/kernel/io.c
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/export.h>
+#include <linux/types.h>
+#include <linux/io.h>
+
+/*
+ * Copy data from IO memory space to "real" memory space.
+ */
+void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
+{
+	while (count && !IS_ALIGNED((unsigned long)from, 4)) {
+		*(u8 *)to = __raw_readb(from);
+		from++;
+		to++;
+		count--;
+	}
+
+	while (count >= 4) {
+		*(u32 *)to = __raw_readl(from);
+		from += 4;
+		to += 4;
+		count -= 4;
+	}
+
+	while (count) {
+		*(u8 *)to = __raw_readb(from);
+		from++;
+		to++;
+		count--;
+	}
+}
+EXPORT_SYMBOL(__memcpy_fromio);
+
+/*
+ * Copy data from "real" memory space to IO memory space.
+ */
+void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
+{
+	while (count && !IS_ALIGNED((unsigned long)to, 4)) {
+		__raw_writeb(*(u8 *)from, to);
+		from++;
+		to++;
+		count--;
+	}
+
+	while (count >= 4) {
+		__raw_writel(*(u32 *)from, to);
+		from += 4;
+		to += 4;
+		count -= 4;
+	}
+
+	while (count) {
+		__raw_writeb(*(u8 *)from, to);
+		from++;
+		to++;
+		count--;
+	}
+}
+EXPORT_SYMBOL(__memcpy_toio);
+
+/*
+ * "memset" on IO memory space.
+ */
+void __memset_io(volatile void __iomem *dst, int c, size_t count)
+{
+	u32 qc = (u8)c;
+
+	qc |= qc << 8;
+	qc |= qc << 16;
+
+	while (count && !IS_ALIGNED((unsigned long)dst, 4)) {
+		__raw_writeb(c, dst);
+		dst++;
+		count--;
+	}
+
+	while (count >= 4) {
+		__raw_writel(qc, dst);
+		dst += 4;
+		count -= 4;
+	}
+
+	while (count) {
+		__raw_writeb(c, dst);
+		dst++;
+		count--;
+	}
+}
+EXPORT_SYMBOL(__memset_io);
diff --git a/arch/csky/kernel/jump_label.c b/arch/csky/kernel/jump_label.c
new file mode 100644
index 000000000000..d0e8b21447e1
--- /dev/null
+++ b/arch/csky/kernel/jump_label.c
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/jump_label.h>
+#include <linux/kernel.h>
+#include <linux/memory.h>
+#include <linux/mutex.h>
+#include <linux/uaccess.h>
+#include <asm/cacheflush.h>
+
+#define NOP32_HI	0xc400
+#define NOP32_LO	0x4820
+#define BSR_LINK	0xe000
+
+void arch_jump_label_transform(struct jump_entry *entry,
+			       enum jump_label_type type)
+{
+	unsigned long addr = jump_entry_code(entry);
+	u16 insn[2];
+	int ret = 0;
+
+	if (type == JUMP_LABEL_JMP) {
+		long offset = jump_entry_target(entry) - jump_entry_code(entry);
+
+		if (WARN_ON(offset & 1 || offset < -67108864 || offset >= 67108864))
+			return;
+
+		offset = offset >> 1;
+
+		insn[0] = BSR_LINK |
+			((uint16_t)((unsigned long) offset >> 16) & 0x3ff);
+		insn[1] = (uint16_t)((unsigned long) offset & 0xffff);
+	} else {
+		insn[0] = NOP32_HI;
+		insn[1] = NOP32_LO;
+	}
+
+	ret = copy_to_kernel_nofault((void *)addr, insn, 4);
+	WARN_ON(ret);
+
+	flush_icache_range(addr, addr + 4);
+}
+
+void arch_jump_label_transform_static(struct jump_entry *entry,
+				      enum jump_label_type type)
+{
+	/*
+	 * We use the same instructions in the arch_static_branch and
+	 * arch_static_branch_jump inline functions, so there's no
+	 * need to patch them up here.
+	 * The core will call arch_jump_label_transform  when those
+	 * instructions need to be replaced.
+	 */
+	arch_jump_label_transform(entry, type);
+}
diff --git a/arch/csky/kernel/module.c b/arch/csky/kernel/module.c
index 6cd82d69c655..f11b3e573344 100644
--- a/arch/csky/kernel/module.c
+++ b/arch/csky/kernel/module.c
@@ -68,7 +68,7 @@ int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
 			*location = rel[i].r_addend + sym->st_value;
 			break;
 		case R_CSKY_PC32:
-			/* Add the value, subtract its postition */
+			/* Add the value, subtract its position */
 			*location = rel[i].r_addend + sym->st_value
 							- (uint32_t)location;
 			break;
diff --git a/arch/csky/kernel/perf_callchain.c b/arch/csky/kernel/perf_callchain.c
index ab55e98ee8f6..1612f4354087 100644
--- a/arch/csky/kernel/perf_callchain.c
+++ b/arch/csky/kernel/perf_callchain.c
@@ -49,7 +49,7 @@ static unsigned long user_backtrace(struct perf_callchain_entry_ctx *entry,
 {
 	struct stackframe buftail;
 	unsigned long lr = 0;
-	unsigned long *user_frame_tail = (unsigned long *)fp;
+	unsigned long __user *user_frame_tail = (unsigned long __user *)fp;
 
 	/* Check accessibility of one struct frame_tail beyond */
 	if (!access_ok(user_frame_tail, sizeof(buftail)))
@@ -88,10 +88,6 @@ void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
 {
 	unsigned long fp = 0;
 
-	/* C-SKY does not support virtualization. */
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest())
-		return;
-
 	fp = regs->regs[4];
 	perf_callchain_store(entry, regs->pc);
 
@@ -112,12 +108,6 @@ void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
 {
 	struct stackframe fr;
 
-	/* C-SKY does not support virtualization. */
-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
-		pr_warn("C-SKY does not support perf in guest mode!");
-		return;
-	}
-
 	fr.fp = regs->regs[4];
 	fr.lr = regs->lr;
 	walk_stackframe(&fr, entry);
diff --git a/arch/csky/kernel/power.c b/arch/csky/kernel/power.c
index 923ee4e381b8..86ee202906f8 100644
--- a/arch/csky/kernel/power.c
+++ b/arch/csky/kernel/power.c
@@ -9,16 +9,14 @@ EXPORT_SYMBOL(pm_power_off);
 void machine_power_off(void)
 {
 	local_irq_disable();
-	if (pm_power_off)
-		pm_power_off();
+	do_kernel_power_off();
 	asm volatile ("bkpt");
 }
 
 void machine_halt(void)
 {
 	local_irq_disable();
-	if (pm_power_off)
-		pm_power_off();
+	do_kernel_power_off();
 	asm volatile ("bkpt");
 }
 
diff --git a/arch/csky/kernel/probes/kprobes.c b/arch/csky/kernel/probes/kprobes.c
index 42920f25e73c..3c6e5c725d81 100644
--- a/arch/csky/kernel/probes/kprobes.c
+++ b/arch/csky/kernel/probes/kprobes.c
@@ -30,7 +30,7 @@ static int __kprobes patch_text_cb(void *priv)
 	struct csky_insn_patch *param = priv;
 	unsigned int addr = (unsigned int)param->addr;
 
-	if (atomic_inc_return(&param->cpu_count) == 1) {
+	if (atomic_inc_return(&param->cpu_count) == num_online_cpus()) {
 		*(u16 *) addr = cpu_to_le16(param->opcode);
 		dcache_wb_range(addr, addr + 2);
 		atomic_inc(&param->cpu_count);
@@ -124,6 +124,10 @@ void __kprobes arch_disarm_kprobe(struct kprobe *p)
 
 void __kprobes arch_remove_kprobe(struct kprobe *p)
 {
+	if (p->ainsn.api.insn) {
+		free_insn_slot(p->ainsn.api.insn, 0);
+		p->ainsn.api.insn = NULL;
+	}
 }
 
 static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
diff --git a/arch/csky/kernel/probes/uprobes.c b/arch/csky/kernel/probes/uprobes.c
index 1a9e0961b2b5..2d31a12e46cf 100644
--- a/arch/csky/kernel/probes/uprobes.c
+++ b/arch/csky/kernel/probes/uprobes.c
@@ -102,7 +102,7 @@ void arch_uprobe_abort_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
 	struct uprobe_task *utask = current->utask;
 
 	/*
-	 * Task has received a fatal signal, so reset back to probbed
+	 * Task has received a fatal signal, so reset back to probed
 	 * address.
 	 */
 	instruction_pointer_set(regs, utask->vaddr);
diff --git a/arch/csky/kernel/process.c b/arch/csky/kernel/process.c
index 3d0ca22cd0e2..eedddb155669 100644
--- a/arch/csky/kernel/process.c
+++ b/arch/csky/kernel/process.c
@@ -2,7 +2,6 @@
 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
 
 #include <linux/module.h>
-#include <linux/version.h>
 #include <linux/sched.h>
 #include <linux/sched/task_stack.h>
 #include <linux/sched/debug.h>
@@ -30,12 +29,11 @@ asmlinkage void ret_from_kernel_thread(void);
  */
 void flush_thread(void){}
 
-int copy_thread(unsigned long clone_flags,
-		unsigned long usp,
-		unsigned long kthread_arg,
-		struct task_struct *p,
-		unsigned long tls)
+int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
 {
+	unsigned long clone_flags = args->flags;
+	unsigned long usp = args->stack;
+	unsigned long tls = args->tls;
 	struct switch_stack *childstack;
 	struct pt_regs *childregs = task_pt_regs(p);
 
@@ -49,11 +47,11 @@ int copy_thread(unsigned long clone_flags,
 	/* setup thread.sp for switch_to !!! */
 	p->thread.sp = (unsigned long)childstack;
 
-	if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) {
+	if (unlikely(args->fn)) {
 		memset(childregs, 0, sizeof(struct pt_regs));
 		childstack->r15 = (unsigned long) ret_from_kernel_thread;
-		childstack->r10 = kthread_arg;
-		childstack->r9 = usp;
+		childstack->r10 = (unsigned long) args->fn_arg;
+		childstack->r9 = (unsigned long) args->fn;
 		childregs->sr = mfcr("psr");
 	} else {
 		*childregs = *(current_pt_regs());
diff --git a/arch/csky/kernel/ptrace.c b/arch/csky/kernel/ptrace.c
index 1a5f54e0d272..0f7e7b653c72 100644
--- a/arch/csky/kernel/ptrace.c
+++ b/arch/csky/kernel/ptrace.c
@@ -12,7 +12,6 @@
 #include <linux/sched/task_stack.h>
 #include <linux/signal.h>
 #include <linux/smp.h>
-#include <linux/tracehook.h>
 #include <linux/uaccess.h>
 #include <linux/user.h>
 
@@ -321,7 +320,7 @@ long arch_ptrace(struct task_struct *child, long request,
 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
 {
 	if (test_thread_flag(TIF_SYSCALL_TRACE))
-		if (tracehook_report_syscall_entry(regs))
+		if (ptrace_report_syscall_entry(regs))
 			return -1;
 
 	if (secure_computing() == -1)
@@ -339,7 +338,7 @@ asmlinkage void syscall_trace_exit(struct pt_regs *regs)
 	audit_syscall_exit(regs);
 
 	if (test_thread_flag(TIF_SYSCALL_TRACE))
-		tracehook_report_syscall_exit(regs, 0);
+		ptrace_report_syscall_exit(regs, 0);
 
 	if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
 		trace_sys_exit(regs, syscall_get_return_value(current, regs));
diff --git a/arch/csky/kernel/setup.c b/arch/csky/kernel/setup.c
index c64e7be2045b..106fbf0b6f3b 100644
--- a/arch/csky/kernel/setup.c
+++ b/arch/csky/kernel/setup.c
@@ -31,7 +31,7 @@ static void __init csky_memblock_init(void)
 	unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
 	signed long size;
 
-	memblock_reserve(__pa(_stext), _end - _stext);
+	memblock_reserve(__pa(_start), _end - _start);
 
 	early_init_fdt_reserve_self();
 	early_init_fdt_scan_reserved_mem();
@@ -78,7 +78,7 @@ void __init setup_arch(char **cmdline_p)
 	pr_info("Phys. mem: %ldMB\n",
 		(unsigned long) memblock_phys_mem_size()/1024/1024);
 
-	setup_initial_init_mm(_stext, _etext, _edata, _end);
+	setup_initial_init_mm(_start, _etext, _edata, _end);
 
 	parse_early_param();
 
diff --git a/arch/csky/kernel/signal.c b/arch/csky/kernel/signal.c
index c7b763d2f526..b7b3685283d7 100644
--- a/arch/csky/kernel/signal.c
+++ b/arch/csky/kernel/signal.c
@@ -3,7 +3,7 @@
 #include <linux/signal.h>
 #include <linux/uaccess.h>
 #include <linux/syscalls.h>
-#include <linux/tracehook.h>
+#include <linux/resume_user_mode.h>
 
 #include <asm/traps.h>
 #include <asm/ucontext.h>
@@ -136,7 +136,7 @@ static inline void __user *get_sigframe(struct ksignal *ksig,
 static int
 setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
 {
-	struct rt_sigframe *frame;
+	struct rt_sigframe __user *frame;
 	int err = 0;
 
 	frame = get_sigframe(ksig, regs, sizeof(*frame));
@@ -265,5 +265,5 @@ asmlinkage void do_notify_resume(struct pt_regs *regs,
 		do_signal(regs);
 
 	if (thread_info_flags & _TIF_NOTIFY_RESUME)
-		tracehook_notify_resume(regs);
+		resume_user_mode_work(regs);
 }
diff --git a/arch/csky/kernel/smp.c b/arch/csky/kernel/smp.c
index 6bb38bc2f39b..4b605aa2e1d6 100644
--- a/arch/csky/kernel/smp.c
+++ b/arch/csky/kernel/smp.c
@@ -243,11 +243,6 @@ void __init smp_cpus_done(unsigned int max_cpus)
 {
 }
 
-int setup_profiling_timer(unsigned int multiplier)
-{
-	return -EINVAL;
-}
-
 void csky_start_secondary(void)
 {
 	struct mm_struct *mm = &init_mm;
diff --git a/arch/csky/kernel/traps.c b/arch/csky/kernel/traps.c
index 2020af88b636..6e426fba0119 100644
--- a/arch/csky/kernel/traps.c
+++ b/arch/csky/kernel/traps.c
@@ -109,7 +109,7 @@ void die(struct pt_regs *regs, const char *str)
 	if (panic_on_oops)
 		panic("Fatal exception");
 	if (ret != NOTIFY_STOP)
-		do_exit(SIGSEGV);
+		make_task_dead(SIGSEGV);
 }
 
 void do_trap(struct pt_regs *regs, int signo, int code, unsigned long addr)
diff --git a/arch/csky/kernel/vmlinux.lds.S b/arch/csky/kernel/vmlinux.lds.S
index e8b1a4a49798..68c980d08482 100644
--- a/arch/csky/kernel/vmlinux.lds.S
+++ b/arch/csky/kernel/vmlinux.lds.S
@@ -22,17 +22,13 @@ SECTIONS
 {
 	. = PAGE_OFFSET + PHYS_OFFSET_OFFSET;
 
-	_stext = .;
-	__init_begin = .;
+	_start = .;
 	HEAD_TEXT_SECTION
-	INIT_TEXT_SECTION(PAGE_SIZE)
-	INIT_DATA_SECTION(PAGE_SIZE)
-	PERCPU_SECTION(L1_CACHE_BYTES)
 	. = ALIGN(PAGE_SIZE);
-	__init_end = .;
 
 	.text : AT(ADDR(.text) - LOAD_OFFSET) {
 		_text = .;
+		_stext = .;
 		VBR_BASE
 		IRQENTRY_TEXT
 		SOFTIRQENTRY_TEXT
@@ -48,7 +44,12 @@ SECTIONS
 
 	/* __init_begin __init_end must be page aligned for free_initmem */
 	. = ALIGN(PAGE_SIZE);
-
+	__init_begin = .;
+	INIT_TEXT_SECTION(PAGE_SIZE)
+	INIT_DATA_SECTION(PAGE_SIZE)
+	PERCPU_SECTION(L1_CACHE_BYTES)
+	. = ALIGN(PAGE_SIZE);
+	__init_end = .;
 
 	_sdata = .;
 	RO_DATA(PAGE_SIZE)