Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) #include <linux/ftrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/stop_machine.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #ifdef CONFIG_DYNAMIC_FTRACE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #define NOP		0x4000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #define NOP32_HI	0xc400
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #define NOP32_LO	0x4820
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #define PUSH_LR		0x14d0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #define MOVIH_LINK	0xea3a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #define ORI_LINK	0xef5a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #define JSR_LINK	0xe8fa
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #define BSR_LINK	0xe000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  * Gcc-csky with -pg will insert stub in function prologue:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  *	push	lr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  *	jbsr	_mcount
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  *	nop32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  *	nop32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  * If the (callee - current_pc) is less then 64MB, we'll use bsr:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28)  *	push	lr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  *	bsr	_mcount
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30)  *	nop32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  *	nop32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  * else we'll use (movih + ori + jsr):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33)  *	push	lr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34)  *	movih	r26, ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35)  *	ori	r26, ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  *	jsr	r26
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38)  * (r26 is our reserved link-reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) static inline void make_jbsr(unsigned long callee, unsigned long pc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 			     uint16_t *call, bool nolr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	long offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	call[0]	= nolr ? NOP : PUSH_LR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	offset = (long) callee - (long) pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	if (unlikely(offset < -67108864 || offset > 67108864)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		call[1] = MOVIH_LINK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		call[2] = callee >> 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		call[3] = ORI_LINK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		call[4] = callee & 0xffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		call[5] = JSR_LINK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		call[6] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		offset = offset >> 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		call[1] = BSR_LINK |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 			 ((uint16_t)((unsigned long) offset >> 16) & 0x3ff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		call[2] = (uint16_t)((unsigned long) offset & 0xffff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		call[3] = call[5] = NOP32_HI;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		call[4] = call[6] = NOP32_LO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) static uint16_t nops[7] = {NOP, NOP32_HI, NOP32_LO, NOP32_HI, NOP32_LO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 				NOP32_HI, NOP32_LO};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) static int ftrace_check_current_nop(unsigned long hook)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	uint16_t olds[7];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	unsigned long hook_pos = hook - 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	if (copy_from_kernel_nofault((void *)olds, (void *)hook_pos,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 			sizeof(nops)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	if (memcmp((void *)nops, (void *)olds, sizeof(nops))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		pr_err("%p: nop but get (%04x %04x %04x %04x %04x %04x %04x)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 			(void *)hook_pos,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 			olds[0], olds[1], olds[2], olds[3], olds[4], olds[5],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 			olds[6]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) static int ftrace_modify_code(unsigned long hook, unsigned long target,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 			      bool enable, bool nolr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	uint16_t call[7];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	unsigned long hook_pos = hook - 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	make_jbsr(target, hook, call, nolr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	ret = copy_to_kernel_nofault((void *)hook_pos, enable ? call : nops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 				 sizeof(nops));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	flush_icache_range(hook_pos, hook_pos + MCOUNT_INSN_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	int ret = ftrace_check_current_nop(rec->ip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	return ftrace_modify_code(rec->ip, addr, true, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		    unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	return ftrace_modify_code(rec->ip, addr, false, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) int ftrace_update_ftrace_func(ftrace_func_t func)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	int ret = ftrace_modify_code((unsigned long)&ftrace_call,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 				(unsigned long)func, true, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		ret = ftrace_modify_code((unsigned long)&ftrace_regs_call,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 				(unsigned long)func, true, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) int __init ftrace_dyn_arch_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) #endif /* CONFIG_DYNAMIC_FTRACE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		       unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	return ftrace_modify_code(rec->ip, addr, true, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) #ifdef CONFIG_FUNCTION_GRAPH_TRACER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 			   unsigned long frame_pointer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	unsigned long return_hooker = (unsigned long)&return_to_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	unsigned long old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	if (unlikely(atomic_read(&current->tracing_graph_pause)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	old = *parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	if (!function_graph_enter(old, self_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 			*(unsigned long *)frame_pointer, parent)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		 * For csky-gcc function has sub-call:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		 * subi	sp,	sp, 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		 * stw	r8,	(sp, 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		 * mov	r8,	sp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		 * st.w r15,	(sp, 0x4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		 * push	r15
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		 * jl	_mcount
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		 * We only need set *parent for resume
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		 * For csky-gcc function has no sub-call:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		 * subi	sp,	sp, 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		 * stw	r8,	(sp, 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		 * mov	r8,	sp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		 * push	r15
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		 * jl	_mcount
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		 * We need set *parent and *(frame_pointer + 4) for resume,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		 * because lr is resumed twice.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		*parent = return_hooker;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		frame_pointer += 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		if (*(unsigned long *)frame_pointer == old)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			*(unsigned long *)frame_pointer = return_hooker;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) #ifdef CONFIG_DYNAMIC_FTRACE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) int ftrace_enable_ftrace_graph_caller(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	return ftrace_modify_code((unsigned long)&ftrace_graph_call,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 			(unsigned long)&ftrace_graph_caller, true, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) int ftrace_disable_ftrace_graph_caller(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	return ftrace_modify_code((unsigned long)&ftrace_graph_call,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 			(unsigned long)&ftrace_graph_caller, false, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) #endif /* CONFIG_DYNAMIC_FTRACE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) #ifdef CONFIG_DYNAMIC_FTRACE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) #ifndef CONFIG_CPU_HAS_ICACHE_INS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) struct ftrace_modify_param {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	int command;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	atomic_t cpu_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) static int __ftrace_modify_code(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	struct ftrace_modify_param *param = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	if (atomic_inc_return(&param->cpu_count) == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		ftrace_modify_all_code(param->command);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		atomic_inc(&param->cpu_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		while (atomic_read(&param->cpu_count) <= num_online_cpus())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 			cpu_relax();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		local_icache_inv_all(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) void arch_ftrace_update_code(int command)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	struct ftrace_modify_param param = { command, ATOMIC_INIT(0) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	stop_machine(__ftrace_modify_code, &param, cpu_online_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) #endif /* CONFIG_DYNAMIC_FTRACE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) /* _mcount is defined in abi's mcount.S */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) EXPORT_SYMBOL(_mcount);