^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * ACPI AML interfacing support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2015, Intel Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Authors: Lv Zheng <lv.zheng@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) /* #define DEBUG */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #define pr_fmt(fmt) "ACPI: AML: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/kthread.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/proc_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/debugfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/circ_buf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define ACPI_AML_BUF_ALIGN (sizeof (acpi_size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define ACPI_AML_BUF_SIZE PAGE_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define circ_count(circ) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) (CIRC_CNT((circ)->head, (circ)->tail, ACPI_AML_BUF_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define circ_count_to_end(circ) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) (CIRC_CNT_TO_END((circ)->head, (circ)->tail, ACPI_AML_BUF_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define circ_space(circ) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) (CIRC_SPACE((circ)->head, (circ)->tail, ACPI_AML_BUF_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define circ_space_to_end(circ) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) (CIRC_SPACE_TO_END((circ)->head, (circ)->tail, ACPI_AML_BUF_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define ACPI_AML_OPENED 0x0001
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define ACPI_AML_CLOSED 0x0002
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define ACPI_AML_IN_USER 0x0004 /* user space is writing cmd */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define ACPI_AML_IN_KERN 0x0008 /* kernel space is reading cmd */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #define ACPI_AML_OUT_USER 0x0010 /* user space is reading log */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #define ACPI_AML_OUT_KERN 0x0020 /* kernel space is writing log */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #define ACPI_AML_USER (ACPI_AML_IN_USER | ACPI_AML_OUT_USER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #define ACPI_AML_KERN (ACPI_AML_IN_KERN | ACPI_AML_OUT_KERN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #define ACPI_AML_BUSY (ACPI_AML_USER | ACPI_AML_KERN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #define ACPI_AML_OPEN (ACPI_AML_OPENED | ACPI_AML_CLOSED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct acpi_aml_io {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) wait_queue_head_t wait;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) unsigned long users;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct mutex lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct task_struct *thread;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) char out_buf[ACPI_AML_BUF_SIZE] __aligned(ACPI_AML_BUF_ALIGN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct circ_buf out_crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) char in_buf[ACPI_AML_BUF_SIZE] __aligned(ACPI_AML_BUF_ALIGN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) struct circ_buf in_crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) acpi_osd_exec_callback function;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) void *context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) unsigned long usages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static struct acpi_aml_io acpi_aml_io;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) static bool acpi_aml_initialized;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static struct file *acpi_aml_active_reader;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static struct dentry *acpi_aml_dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static inline bool __acpi_aml_running(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) return acpi_aml_io.thread ? true : false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static inline bool __acpi_aml_access_ok(unsigned long flag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * The debugger interface is in opened state (OPENED && !CLOSED),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * then it is allowed to access the debugger buffers from either
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * user space or the kernel space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * In addition, for the kernel space, only the debugger thread
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * (thread ID matched) is allowed to access.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) if (!(acpi_aml_io.flags & ACPI_AML_OPENED) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) (acpi_aml_io.flags & ACPI_AML_CLOSED) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) !__acpi_aml_running())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if ((flag & ACPI_AML_KERN) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) current != acpi_aml_io.thread)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return true;
^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 inline bool __acpi_aml_readable(struct circ_buf *circ, unsigned long flag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * Another read is not in progress and there is data in buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * available for read.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (!(acpi_aml_io.flags & flag) && circ_count(circ))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static inline bool __acpi_aml_writable(struct circ_buf *circ, unsigned long flag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) * Another write is not in progress and there is buffer space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) * available for write.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (!(acpi_aml_io.flags & flag) && circ_space(circ))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static inline bool __acpi_aml_busy(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) if (acpi_aml_io.flags & ACPI_AML_BUSY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static inline bool __acpi_aml_opened(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (acpi_aml_io.flags & ACPI_AML_OPEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return 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) static inline bool __acpi_aml_used(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return acpi_aml_io.usages ? true : false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static inline bool acpi_aml_running(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) bool ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) mutex_lock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) ret = __acpi_aml_running();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) mutex_unlock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static bool acpi_aml_busy(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) bool ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) mutex_lock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) ret = __acpi_aml_busy();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) mutex_unlock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) static bool acpi_aml_used(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) bool ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) * The usage count is prepared to avoid race conditions between the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) * starts and the stops of the debugger thread.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) mutex_lock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) ret = __acpi_aml_used();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) mutex_unlock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static bool acpi_aml_kern_readable(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) bool ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) mutex_lock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) ret = !__acpi_aml_access_ok(ACPI_AML_IN_KERN) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) __acpi_aml_readable(&acpi_aml_io.in_crc, ACPI_AML_IN_KERN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) mutex_unlock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) static bool acpi_aml_kern_writable(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) bool ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) mutex_lock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) ret = !__acpi_aml_access_ok(ACPI_AML_OUT_KERN) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) __acpi_aml_writable(&acpi_aml_io.out_crc, ACPI_AML_OUT_KERN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) mutex_unlock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) static bool acpi_aml_user_readable(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) bool ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) mutex_lock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) ret = !__acpi_aml_access_ok(ACPI_AML_OUT_USER) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) __acpi_aml_readable(&acpi_aml_io.out_crc, ACPI_AML_OUT_USER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) mutex_unlock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) static bool acpi_aml_user_writable(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) bool ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) mutex_lock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) ret = !__acpi_aml_access_ok(ACPI_AML_IN_USER) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) __acpi_aml_writable(&acpi_aml_io.in_crc, ACPI_AML_IN_USER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) mutex_unlock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) static int acpi_aml_lock_write(struct circ_buf *circ, unsigned long flag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) mutex_lock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) if (!__acpi_aml_access_ok(flag)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) if (!__acpi_aml_writable(circ, flag)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) ret = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) acpi_aml_io.flags |= flag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) mutex_unlock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) return ret;
^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) static int acpi_aml_lock_read(struct circ_buf *circ, unsigned long flag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) mutex_lock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) if (!__acpi_aml_access_ok(flag)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) if (!__acpi_aml_readable(circ, flag)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) ret = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) acpi_aml_io.flags |= flag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) mutex_unlock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) static void acpi_aml_unlock_fifo(unsigned long flag, bool wakeup)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) mutex_lock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) acpi_aml_io.flags &= ~flag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if (wakeup)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) wake_up_interruptible(&acpi_aml_io.wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) mutex_unlock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) static int acpi_aml_write_kern(const char *buf, int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) struct circ_buf *crc = &acpi_aml_io.out_crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) int n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) char *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) ret = acpi_aml_lock_write(crc, ACPI_AML_OUT_KERN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) /* sync tail before inserting logs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) smp_mb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) p = &crc->buf[crc->head];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) n = min(len, circ_space_to_end(crc));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) memcpy(p, buf, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) /* sync head after inserting logs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) smp_wmb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) crc->head = (crc->head + n) & (ACPI_AML_BUF_SIZE - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) acpi_aml_unlock_fifo(ACPI_AML_OUT_KERN, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) static int acpi_aml_readb_kern(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) struct circ_buf *crc = &acpi_aml_io.in_crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) char *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) ret = acpi_aml_lock_read(crc, ACPI_AML_IN_KERN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) /* sync head before removing cmds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) smp_rmb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) p = &crc->buf[crc->tail];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) ret = (int)*p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) /* sync tail before inserting cmds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) smp_mb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) crc->tail = (crc->tail + 1) & (ACPI_AML_BUF_SIZE - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) acpi_aml_unlock_fifo(ACPI_AML_IN_KERN, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) * acpi_aml_write_log() - Capture debugger output
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) * @msg: the debugger output
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) * This function should be used to implement acpi_os_printf() to filter out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) * the debugger output and store the output into the debugger interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) * buffer. Return the size of stored logs or errno.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) static ssize_t acpi_aml_write_log(const char *msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) int count = 0, size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) if (!acpi_aml_initialized)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) if (msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) count = strlen(msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) while (count > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) again:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) ret = acpi_aml_write_kern(msg + size, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) if (ret == -EAGAIN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) ret = wait_event_interruptible(acpi_aml_io.wait,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) acpi_aml_kern_writable());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) * We need to retry when the condition
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) * becomes true.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) if (ret == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) goto again;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) size += ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) count -= ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) return size > 0 ? size : ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) * acpi_aml_read_cmd() - Capture debugger input
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) * @msg: the debugger input
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) * @size: the size of the debugger input
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) * This function should be used to implement acpi_os_get_line() to capture
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) * the debugger input commands and store the input commands into the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) * debugger interface buffer. Return the size of stored commands or errno.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) static ssize_t acpi_aml_read_cmd(char *msg, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) int size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) * This is ensured by the running fact of the debugger thread
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) * unless a bug is introduced.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) BUG_ON(!acpi_aml_initialized);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) while (count > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) again:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) * Check each input byte to find the end of the command.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) ret = acpi_aml_readb_kern();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) if (ret == -EAGAIN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) ret = wait_event_interruptible(acpi_aml_io.wait,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) acpi_aml_kern_readable());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) * We need to retry when the condition becomes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) * true.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) if (ret == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) goto again;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) *(msg + size) = (char)ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) size++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) if (ret == '\n') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) * acpi_os_get_line() requires a zero terminated command
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) * string.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) *(msg + size - 1) = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) return size > 0 ? size : ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) static int acpi_aml_thread(void *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) acpi_osd_exec_callback function = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) void *context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) mutex_lock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) if (acpi_aml_io.function) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) acpi_aml_io.usages++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) function = acpi_aml_io.function;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) context = acpi_aml_io.context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) mutex_unlock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) if (function)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) function(context);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) mutex_lock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) acpi_aml_io.usages--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) if (!__acpi_aml_used()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) acpi_aml_io.thread = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) wake_up(&acpi_aml_io.wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) mutex_unlock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) * acpi_aml_create_thread() - Create AML debugger thread
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) * @function: the debugger thread callback
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) * @context: the context to be passed to the debugger thread
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) * This function should be used to implement acpi_os_execute() which is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) * used by the ACPICA debugger to create the debugger thread.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) static int acpi_aml_create_thread(acpi_osd_exec_callback function, void *context)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) struct task_struct *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) mutex_lock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) acpi_aml_io.function = function;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) acpi_aml_io.context = context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) mutex_unlock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) t = kthread_create(acpi_aml_thread, NULL, "aml");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) if (IS_ERR(t)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) pr_err("Failed to create AML debugger thread.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) return PTR_ERR(t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) mutex_lock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) acpi_aml_io.thread = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) acpi_set_debugger_thread_id((acpi_thread_id)(unsigned long)t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) wake_up_process(t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) mutex_unlock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) static int acpi_aml_wait_command_ready(bool single_step,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) char *buffer, size_t length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) if (single_step)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) acpi_os_printf("\n%1c ", ACPI_DEBUGGER_EXECUTE_PROMPT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) acpi_os_printf("\n%1c ", ACPI_DEBUGGER_COMMAND_PROMPT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) status = acpi_os_get_line(buffer, length, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) if (ACPI_FAILURE(status))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) static int acpi_aml_notify_command_complete(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) static int acpi_aml_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) mutex_lock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) * The debugger interface is being closed, no new user is allowed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) * during this period.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) if (acpi_aml_io.flags & ACPI_AML_CLOSED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) ret = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) goto err_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) if ((file->f_flags & O_ACCMODE) != O_WRONLY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) * Only one reader is allowed to initiate the debugger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) * thread.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) if (acpi_aml_active_reader) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) ret = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) goto err_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) pr_debug("Opening debugger reader.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) acpi_aml_active_reader = file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) * No writer is allowed unless the debugger thread is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) * ready.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) if (!(acpi_aml_io.flags & ACPI_AML_OPENED)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) goto err_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) if (acpi_aml_active_reader == file) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) pr_debug("Opening debugger interface.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) mutex_unlock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) pr_debug("Initializing debugger thread.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) status = acpi_initialize_debugger();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) if (ACPI_FAILURE(status)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) pr_err("Failed to initialize debugger.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) goto err_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) pr_debug("Debugger thread initialized.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) mutex_lock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) acpi_aml_io.flags |= ACPI_AML_OPENED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) acpi_aml_io.out_crc.head = acpi_aml_io.out_crc.tail = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) acpi_aml_io.in_crc.head = acpi_aml_io.in_crc.tail = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) pr_debug("Debugger interface opened.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) acpi_aml_io.users++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) err_lock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) if (acpi_aml_active_reader == file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) acpi_aml_active_reader = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) mutex_unlock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) err_exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) static int acpi_aml_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) mutex_lock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) acpi_aml_io.users--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) if (file == acpi_aml_active_reader) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) pr_debug("Closing debugger reader.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) acpi_aml_active_reader = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) pr_debug("Closing debugger interface.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) acpi_aml_io.flags |= ACPI_AML_CLOSED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) * Wake up all user space/kernel space blocked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) * readers/writers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) wake_up_interruptible(&acpi_aml_io.wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) mutex_unlock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) * Wait all user space/kernel space readers/writers to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) * stop so that ACPICA command loop of the debugger thread
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) * should fail all its command line reads after this point.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) wait_event(acpi_aml_io.wait, !acpi_aml_busy());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) * Then we try to terminate the debugger thread if it is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) * not terminated.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) pr_debug("Terminating debugger thread.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) acpi_terminate_debugger();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) wait_event(acpi_aml_io.wait, !acpi_aml_used());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) pr_debug("Debugger thread terminated.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) mutex_lock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) acpi_aml_io.flags &= ~ACPI_AML_OPENED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) if (acpi_aml_io.users == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) pr_debug("Debugger interface closed.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) acpi_aml_io.flags &= ~ACPI_AML_CLOSED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) mutex_unlock(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) static int acpi_aml_read_user(char __user *buf, int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) struct circ_buf *crc = &acpi_aml_io.out_crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) int n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) char *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) ret = acpi_aml_lock_read(crc, ACPI_AML_OUT_USER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) /* sync head before removing logs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) smp_rmb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) p = &crc->buf[crc->tail];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) n = min(len, circ_count_to_end(crc));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) if (copy_to_user(buf, p, n)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) /* sync tail after removing logs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) smp_mb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) crc->tail = (crc->tail + n) & (ACPI_AML_BUF_SIZE - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) ret = n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) acpi_aml_unlock_fifo(ACPI_AML_OUT_USER, ret >= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) static ssize_t acpi_aml_read(struct file *file, char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) int size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) if (!count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) if (!access_ok(buf, count))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) while (count > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) again:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) ret = acpi_aml_read_user(buf + size, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) if (ret == -EAGAIN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) if (file->f_flags & O_NONBLOCK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) ret = wait_event_interruptible(acpi_aml_io.wait,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) acpi_aml_user_readable());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) * We need to retry when the condition
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) * becomes true.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) if (ret == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) goto again;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) if (!acpi_aml_running())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) size += ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) count -= ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) *ppos += ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) return size > 0 ? size : ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) static int acpi_aml_write_user(const char __user *buf, int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) struct circ_buf *crc = &acpi_aml_io.in_crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) int n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) char *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) ret = acpi_aml_lock_write(crc, ACPI_AML_IN_USER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) /* sync tail before inserting cmds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) smp_mb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) p = &crc->buf[crc->head];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) n = min(len, circ_space_to_end(crc));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) if (copy_from_user(p, buf, n)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) /* sync head after inserting cmds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) smp_wmb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) crc->head = (crc->head + n) & (ACPI_AML_BUF_SIZE - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) ret = n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) acpi_aml_unlock_fifo(ACPI_AML_IN_USER, ret >= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) static ssize_t acpi_aml_write(struct file *file, const char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) int size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) if (!count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) if (!access_ok(buf, count))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) while (count > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) again:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) ret = acpi_aml_write_user(buf + size, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) if (ret == -EAGAIN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) if (file->f_flags & O_NONBLOCK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) ret = wait_event_interruptible(acpi_aml_io.wait,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) acpi_aml_user_writable());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) * We need to retry when the condition
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) * becomes true.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) if (ret == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) goto again;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) if (!acpi_aml_running())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) size += ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) count -= ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) *ppos += ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) return size > 0 ? size : ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) static __poll_t acpi_aml_poll(struct file *file, poll_table *wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) __poll_t masks = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) poll_wait(file, &acpi_aml_io.wait, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) if (acpi_aml_user_readable())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) masks |= EPOLLIN | EPOLLRDNORM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) if (acpi_aml_user_writable())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) masks |= EPOLLOUT | EPOLLWRNORM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) return masks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) static const struct file_operations acpi_aml_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) .read = acpi_aml_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) .write = acpi_aml_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) .poll = acpi_aml_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) .open = acpi_aml_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) .release = acpi_aml_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) .llseek = generic_file_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) static const struct acpi_debugger_ops acpi_aml_debugger = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) .create_thread = acpi_aml_create_thread,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) .read_cmd = acpi_aml_read_cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) .write_log = acpi_aml_write_log,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) .wait_command_ready = acpi_aml_wait_command_ready,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) .notify_command_complete = acpi_aml_notify_command_complete,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) static int __init acpi_aml_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) if (acpi_disabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) /* Initialize AML IO interface */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) mutex_init(&acpi_aml_io.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) init_waitqueue_head(&acpi_aml_io.wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) acpi_aml_io.out_crc.buf = acpi_aml_io.out_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) acpi_aml_io.in_crc.buf = acpi_aml_io.in_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) acpi_aml_dentry = debugfs_create_file("acpidbg",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) S_IFREG | S_IRUGO | S_IWUSR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) acpi_debugfs_dir, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) &acpi_aml_operations);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) ret = acpi_register_debugger(THIS_MODULE, &acpi_aml_debugger);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) debugfs_remove(acpi_aml_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) acpi_aml_dentry = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) acpi_aml_initialized = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) static void __exit acpi_aml_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) if (acpi_aml_initialized) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) acpi_unregister_debugger(&acpi_aml_debugger);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) debugfs_remove(acpi_aml_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) acpi_aml_dentry = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) acpi_aml_initialized = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) module_init(acpi_aml_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) module_exit(acpi_aml_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) MODULE_AUTHOR("Lv Zheng");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) MODULE_DESCRIPTION("ACPI debugger userspace IO driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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