ACPI / debugger: Add module support for ACPI debugger
This patch converts AML debugger into a loadable module. Note that, it implements driver unloading at the level dependent on the module reference count. Which means if ACPI debugger is being used by a userspace program, "rmmod acpi_dbg" should result in failure. Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lv Zheng
Rafael J. Wysocki
parent
37645d6590
commit
836d083018
7 changed files with 340 additions and 91 deletions
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@ -60,13 +60,23 @@ config ACPI_CCA_REQUIRED
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config ACPI_DEBUGGER
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bool "AML debugger interface"
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select ACPI_DEBUG
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depends on DEBUG_FS
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help
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Enable in-kernel debugging of AML facilities: statistics, internal
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object dump, single step control method execution.
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Enable in-kernel debugging of AML facilities: statistics,
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internal object dump, single step control method execution.
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This is still under development, currently enabling this only
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results in the compilation of the ACPICA debugger files.
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if ACPI_DEBUGGER
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config ACPI_DEBUGGER_USER
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tristate "Userspace debugger accessiblity"
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depends on DEBUG_FS
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help
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Export /sys/kernel/debug/acpi/acpidbg for userspace utilities
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to access the debugger functionalities.
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endif
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config ACPI_SLEEP
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bool
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depends on SUSPEND || HIBERNATION
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@ -50,7 +50,6 @@ acpi-y += sysfs.o
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acpi-y += property.o
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acpi-$(CONFIG_X86) += acpi_cmos_rtc.o
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acpi-$(CONFIG_DEBUG_FS) += debugfs.o
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acpi-$(CONFIG_ACPI_DEBUGGER) += acpi_dbg.o
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acpi-$(CONFIG_ACPI_NUMA) += numa.o
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acpi-$(CONFIG_ACPI_PROCFS_POWER) += cm_sbs.o
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acpi-y += acpi_lpat.o
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@ -80,6 +79,7 @@ obj-$(CONFIG_ACPI_EC_DEBUGFS) += ec_sys.o
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obj-$(CONFIG_ACPI_CUSTOM_METHOD)+= custom_method.o
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obj-$(CONFIG_ACPI_BGRT) += bgrt.o
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obj-$(CONFIG_ACPI_CPPC_LIB) += cppc_acpi.o
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obj-$(CONFIG_ACPI_DEBUGGER_USER) += acpi_dbg.o
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# processor has its own "processor." module_param namespace
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processor-y := processor_driver.o
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@ -21,7 +21,7 @@
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#include <linux/proc_fs.h>
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#include <linux/debugfs.h>
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#include <linux/circ_buf.h>
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#include <linux/acpi_dbg.h>
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#include <linux/acpi.h>
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#include "internal.h"
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#define ACPI_AML_BUF_ALIGN (sizeof (acpi_size))
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@ -307,7 +307,7 @@ static int acpi_aml_readb_kern(void)
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* the debugger output and store the output into the debugger interface
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* buffer. Return the size of stored logs or errno.
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*/
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ssize_t acpi_aml_write_log(const char *msg)
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static ssize_t acpi_aml_write_log(const char *msg)
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{
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int ret = 0;
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int count = 0, size = 0;
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@ -337,7 +337,6 @@ ssize_t acpi_aml_write_log(const char *msg)
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}
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return size > 0 ? size : ret;
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}
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EXPORT_SYMBOL(acpi_aml_write_log);
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/*
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* acpi_aml_read_cmd() - Capture debugger input
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@ -348,7 +347,7 @@ EXPORT_SYMBOL(acpi_aml_write_log);
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* the debugger input commands and store the input commands into the
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* debugger interface buffer. Return the size of stored commands or errno.
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*/
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ssize_t acpi_aml_read_cmd(char *msg, size_t count)
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static ssize_t acpi_aml_read_cmd(char *msg, size_t count)
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{
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int ret = 0;
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int size = 0;
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@ -390,7 +389,6 @@ ssize_t acpi_aml_read_cmd(char *msg, size_t count)
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}
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return size > 0 ? size : ret;
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}
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EXPORT_SYMBOL(acpi_aml_read_cmd);
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static int acpi_aml_thread(void *unsed)
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{
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@ -427,7 +425,7 @@ static int acpi_aml_thread(void *unsed)
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* This function should be used to implement acpi_os_execute() which is
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* used by the ACPICA debugger to create the debugger thread.
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*/
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int acpi_aml_create_thread(acpi_osd_exec_callback function, void *context)
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static int acpi_aml_create_thread(acpi_osd_exec_callback function, void *context)
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{
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struct task_struct *t;
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@ -449,30 +447,27 @@ int acpi_aml_create_thread(acpi_osd_exec_callback function, void *context)
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mutex_unlock(&acpi_aml_io.lock);
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return 0;
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}
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EXPORT_SYMBOL(acpi_aml_create_thread);
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int acpi_aml_wait_command_ready(void)
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static int acpi_aml_wait_command_ready(bool single_step,
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char *buffer, size_t length)
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{
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acpi_status status;
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if (!acpi_gbl_method_executing)
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acpi_os_printf("\n%1c ", ACPI_DEBUGGER_COMMAND_PROMPT);
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else
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if (single_step)
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acpi_os_printf("\n%1c ", ACPI_DEBUGGER_EXECUTE_PROMPT);
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else
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acpi_os_printf("\n%1c ", ACPI_DEBUGGER_COMMAND_PROMPT);
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status = acpi_os_get_line(acpi_gbl_db_line_buf,
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ACPI_DB_LINE_BUFFER_SIZE, NULL);
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status = acpi_os_get_line(buffer, length, NULL);
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if (ACPI_FAILURE(status))
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return -EINVAL;
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return 0;
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}
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EXPORT_SYMBOL(acpi_aml_wait_command_ready);
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int acpi_aml_notify_command_complete(void)
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static int acpi_aml_notify_command_complete(void)
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{
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return 0;
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}
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EXPORT_SYMBOL(acpi_aml_notify_command_complete);
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static int acpi_aml_open(struct inode *inode, struct file *file)
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{
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@ -746,10 +741,23 @@ static const struct file_operations acpi_aml_operations = {
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.llseek = generic_file_llseek,
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};
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static const struct acpi_debugger_ops acpi_aml_debugger = {
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.create_thread = acpi_aml_create_thread,
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.read_cmd = acpi_aml_read_cmd,
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.write_log = acpi_aml_write_log,
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.wait_command_ready = acpi_aml_wait_command_ready,
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.notify_command_complete = acpi_aml_notify_command_complete,
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};
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int __init acpi_aml_init(void)
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{
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if (!acpi_debugfs_dir)
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return -ENOENT;
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int ret = 0;
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if (!acpi_debugfs_dir) {
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ret = -ENOENT;
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goto err_exit;
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}
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/* Initialize AML IO interface */
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mutex_init(&acpi_aml_io.lock);
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init_waitqueue_head(&acpi_aml_io.wait);
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@ -759,21 +767,39 @@ int __init acpi_aml_init(void)
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S_IFREG | S_IRUGO | S_IWUSR,
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acpi_debugfs_dir, NULL,
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&acpi_aml_operations);
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if (acpi_aml_dentry == NULL)
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return -ENODEV;
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if (acpi_aml_dentry == NULL) {
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ret = -ENODEV;
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goto err_exit;
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}
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ret = acpi_register_debugger(THIS_MODULE, &acpi_aml_debugger);
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if (ret)
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goto err_fs;
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acpi_aml_initialized = true;
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return 0;
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err_fs:
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if (ret) {
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debugfs_remove(acpi_aml_dentry);
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acpi_aml_dentry = NULL;
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}
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err_exit:
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return ret;
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}
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#if 0
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void __exit acpi_aml_exit(void)
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{
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/* TODO: Stop the in kernel debugger */
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if (acpi_aml_dentry)
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debugfs_remove(acpi_aml_dentry);
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acpi_aml_initialized = false;
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if (acpi_aml_initialized) {
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acpi_unregister_debugger(&acpi_aml_debugger);
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if (acpi_aml_dentry) {
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debugfs_remove(acpi_aml_dentry);
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acpi_aml_dentry = NULL;
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}
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acpi_aml_initialized = false;
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}
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}
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module_init(acpi_aml_init);
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module_exit(acpi_aml_exit);
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#endif
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MODULE_AUTHOR("Lv Zheng");
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MODULE_DESCRIPTION("ACPI debugger userspace IO driver");
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MODULE_LICENSE("GPL");
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@ -37,7 +37,6 @@
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#include <acpi/apei.h>
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#include <linux/dmi.h>
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#include <linux/suspend.h>
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#include <linux/acpi_dbg.h>
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#include "internal.h"
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@ -1095,7 +1094,7 @@ static int __init acpi_init(void)
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acpi_debugfs_init();
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acpi_sleep_proc_init();
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acpi_wakeup_device_init();
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acpi_aml_init();
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acpi_debugger_init();
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return 0;
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}
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@ -40,7 +40,6 @@
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#include <linux/list.h>
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#include <linux/jiffies.h>
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#include <linux/semaphore.h>
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#include <linux/acpi_dbg.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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@ -221,6 +220,7 @@ void acpi_os_printf(const char *fmt, ...)
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acpi_os_vprintf(fmt, args);
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va_end(args);
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}
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EXPORT_SYMBOL(acpi_os_printf);
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void acpi_os_vprintf(const char *fmt, va_list args)
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{
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@ -235,7 +235,7 @@ void acpi_os_vprintf(const char *fmt, va_list args)
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printk(KERN_CONT "%s", buffer);
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}
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#else
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if (acpi_aml_write_log(buffer) < 0)
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if (acpi_debugger_write_log(buffer) < 0)
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printk(KERN_CONT "%s", buffer);
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#endif
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}
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@ -1103,6 +1103,200 @@ static void acpi_os_execute_deferred(struct work_struct *work)
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kfree(dpc);
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}
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#ifdef CONFIG_ACPI_DEBUGGER
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static struct acpi_debugger acpi_debugger;
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static bool acpi_debugger_initialized;
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int acpi_register_debugger(struct module *owner,
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const struct acpi_debugger_ops *ops)
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{
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int ret = 0;
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mutex_lock(&acpi_debugger.lock);
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if (acpi_debugger.ops) {
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ret = -EBUSY;
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goto err_lock;
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}
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acpi_debugger.owner = owner;
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acpi_debugger.ops = ops;
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err_lock:
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mutex_unlock(&acpi_debugger.lock);
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return ret;
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}
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EXPORT_SYMBOL(acpi_register_debugger);
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void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
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{
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mutex_lock(&acpi_debugger.lock);
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if (ops == acpi_debugger.ops) {
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acpi_debugger.ops = NULL;
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acpi_debugger.owner = NULL;
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}
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mutex_unlock(&acpi_debugger.lock);
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}
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EXPORT_SYMBOL(acpi_unregister_debugger);
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int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
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{
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int ret;
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int (*func)(acpi_osd_exec_callback, void *);
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struct module *owner;
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if (!acpi_debugger_initialized)
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return -ENODEV;
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mutex_lock(&acpi_debugger.lock);
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if (!acpi_debugger.ops) {
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ret = -ENODEV;
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goto err_lock;
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}
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if (!try_module_get(acpi_debugger.owner)) {
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ret = -ENODEV;
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goto err_lock;
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}
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func = acpi_debugger.ops->create_thread;
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owner = acpi_debugger.owner;
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mutex_unlock(&acpi_debugger.lock);
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ret = func(function, context);
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mutex_lock(&acpi_debugger.lock);
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module_put(owner);
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err_lock:
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mutex_unlock(&acpi_debugger.lock);
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return ret;
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}
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ssize_t acpi_debugger_write_log(const char *msg)
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{
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ssize_t ret;
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ssize_t (*func)(const char *);
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struct module *owner;
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if (!acpi_debugger_initialized)
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return -ENODEV;
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mutex_lock(&acpi_debugger.lock);
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if (!acpi_debugger.ops) {
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ret = -ENODEV;
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goto err_lock;
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}
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if (!try_module_get(acpi_debugger.owner)) {
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ret = -ENODEV;
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goto err_lock;
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}
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func = acpi_debugger.ops->write_log;
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owner = acpi_debugger.owner;
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mutex_unlock(&acpi_debugger.lock);
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ret = func(msg);
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mutex_lock(&acpi_debugger.lock);
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module_put(owner);
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err_lock:
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mutex_unlock(&acpi_debugger.lock);
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return ret;
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}
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ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
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{
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ssize_t ret;
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ssize_t (*func)(char *, size_t);
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struct module *owner;
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if (!acpi_debugger_initialized)
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return -ENODEV;
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mutex_lock(&acpi_debugger.lock);
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if (!acpi_debugger.ops) {
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ret = -ENODEV;
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goto err_lock;
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}
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if (!try_module_get(acpi_debugger.owner)) {
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ret = -ENODEV;
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goto err_lock;
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}
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func = acpi_debugger.ops->read_cmd;
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owner = acpi_debugger.owner;
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mutex_unlock(&acpi_debugger.lock);
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ret = func(buffer, buffer_length);
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mutex_lock(&acpi_debugger.lock);
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module_put(owner);
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err_lock:
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mutex_unlock(&acpi_debugger.lock);
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return ret;
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}
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int acpi_debugger_wait_command_ready(void)
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{
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int ret;
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int (*func)(bool, char *, size_t);
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struct module *owner;
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if (!acpi_debugger_initialized)
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return -ENODEV;
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mutex_lock(&acpi_debugger.lock);
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if (!acpi_debugger.ops) {
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ret = -ENODEV;
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goto err_lock;
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}
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if (!try_module_get(acpi_debugger.owner)) {
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ret = -ENODEV;
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goto err_lock;
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}
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func = acpi_debugger.ops->wait_command_ready;
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owner = acpi_debugger.owner;
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mutex_unlock(&acpi_debugger.lock);
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ret = func(acpi_gbl_method_executing,
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acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
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mutex_lock(&acpi_debugger.lock);
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module_put(owner);
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err_lock:
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mutex_unlock(&acpi_debugger.lock);
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return ret;
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}
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int acpi_debugger_notify_command_complete(void)
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{
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int ret;
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int (*func)(void);
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struct module *owner;
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if (!acpi_debugger_initialized)
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return -ENODEV;
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mutex_lock(&acpi_debugger.lock);
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if (!acpi_debugger.ops) {
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ret = -ENODEV;
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goto err_lock;
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}
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if (!try_module_get(acpi_debugger.owner)) {
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ret = -ENODEV;
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goto err_lock;
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}
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func = acpi_debugger.ops->notify_command_complete;
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owner = acpi_debugger.owner;
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mutex_unlock(&acpi_debugger.lock);
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ret = func();
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mutex_lock(&acpi_debugger.lock);
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module_put(owner);
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err_lock:
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mutex_unlock(&acpi_debugger.lock);
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return ret;
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}
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int __init acpi_debugger_init(void)
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{
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mutex_init(&acpi_debugger.lock);
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acpi_debugger_initialized = true;
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return 0;
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}
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#endif
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/*******************************************************************************
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*
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* FUNCTION: acpi_os_execute
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@ -1130,7 +1324,7 @@ acpi_status acpi_os_execute(acpi_execute_type type,
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function, context));
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if (type == OSL_DEBUGGER_MAIN_THREAD) {
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ret = acpi_aml_create_thread(function, context);
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ret = acpi_debugger_create_thread(function, context);
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if (ret) {
|
||||
pr_err("Call to kthread_create() failed.\n");
|
||||
status = AE_ERROR;
|
||||
|
|
@ -1380,7 +1574,7 @@ acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
|
|||
#else
|
||||
int ret;
|
||||
|
||||
ret = acpi_aml_read_cmd(buffer, buffer_length);
|
||||
ret = acpi_debugger_read_cmd(buffer, buffer_length);
|
||||
if (ret < 0)
|
||||
return AE_ERROR;
|
||||
if (bytes_read)
|
||||
|
|
@ -1389,12 +1583,13 @@ acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
|
|||
|
||||
return AE_OK;
|
||||
}
|
||||
EXPORT_SYMBOL(acpi_os_get_line);
|
||||
|
||||
acpi_status acpi_os_wait_command_ready(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = acpi_aml_wait_command_ready();
|
||||
ret = acpi_debugger_wait_command_ready();
|
||||
if (ret < 0)
|
||||
return AE_ERROR;
|
||||
return AE_OK;
|
||||
|
|
@ -1404,7 +1599,7 @@ acpi_status acpi_os_notify_command_complete(void)
|
|||
{
|
||||
int ret;
|
||||
|
||||
ret = acpi_aml_notify_command_complete();
|
||||
ret = acpi_debugger_notify_command_complete();
|
||||
if (ret < 0)
|
||||
return AE_ERROR;
|
||||
return AE_OK;
|
||||
|
|
|
|||
|
|
@ -37,6 +37,8 @@
|
|||
#include <linux/list.h>
|
||||
#include <linux/mod_devicetable.h>
|
||||
#include <linux/dynamic_debug.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/mutex.h>
|
||||
|
||||
#include <acpi/acpi_bus.h>
|
||||
#include <acpi/acpi_drivers.h>
|
||||
|
|
@ -119,6 +121,75 @@ typedef int (*acpi_tbl_table_handler)(struct acpi_table_header *table);
|
|||
typedef int (*acpi_tbl_entry_handler)(struct acpi_subtable_header *header,
|
||||
const unsigned long end);
|
||||
|
||||
/* Debugger support */
|
||||
|
||||
struct acpi_debugger_ops {
|
||||
int (*create_thread)(acpi_osd_exec_callback function, void *context);
|
||||
ssize_t (*write_log)(const char *msg);
|
||||
ssize_t (*read_cmd)(char *buffer, size_t length);
|
||||
int (*wait_command_ready)(bool single_step, char *buffer, size_t length);
|
||||
int (*notify_command_complete)(void);
|
||||
};
|
||||
|
||||
struct acpi_debugger {
|
||||
const struct acpi_debugger_ops *ops;
|
||||
struct module *owner;
|
||||
struct mutex lock;
|
||||
};
|
||||
|
||||
#ifdef CONFIG_ACPI_DEBUGGER
|
||||
int __init acpi_debugger_init(void);
|
||||
int acpi_register_debugger(struct module *owner,
|
||||
const struct acpi_debugger_ops *ops);
|
||||
void acpi_unregister_debugger(const struct acpi_debugger_ops *ops);
|
||||
int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context);
|
||||
ssize_t acpi_debugger_write_log(const char *msg);
|
||||
ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length);
|
||||
int acpi_debugger_wait_command_ready(void);
|
||||
int acpi_debugger_notify_command_complete(void);
|
||||
#else
|
||||
static inline int acpi_debugger_init(void)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
static inline int acpi_register_debugger(struct module *owner,
|
||||
const struct acpi_debugger_ops *ops)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
static inline void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
|
||||
{
|
||||
}
|
||||
|
||||
static inline int acpi_debugger_create_thread(acpi_osd_exec_callback function,
|
||||
void *context)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
static inline int acpi_debugger_write_log(const char *msg)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
static inline int acpi_debugger_read_cmd(char *buffer, u32 buffer_length)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
static inline int acpi_debugger_wait_command_ready(void)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
static inline int acpi_debugger_notify_command_complete(void)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
|
||||
void acpi_initrd_override(void *data, size_t size);
|
||||
#else
|
||||
|
|
|
|||
|
|
@ -1,52 +0,0 @@
|
|||
/*
|
||||
* ACPI AML interfacing support
|
||||
*
|
||||
* Copyright (C) 2015, Intel Corporation
|
||||
* Authors: Lv Zheng <lv.zheng@intel.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#ifndef _LINUX_ACPI_DBG_H
|
||||
#define _LINUX_ACPI_DBG_H
|
||||
|
||||
#include <linux/acpi.h>
|
||||
|
||||
#ifdef CONFIG_ACPI_DEBUGGER
|
||||
int __init acpi_aml_init(void);
|
||||
int acpi_aml_create_thread(acpi_osd_exec_callback function, void *context);
|
||||
ssize_t acpi_aml_write_log(const char *msg);
|
||||
ssize_t acpi_aml_read_cmd(char *buffer, size_t buffer_length);
|
||||
int acpi_aml_wait_command_ready(void);
|
||||
int acpi_aml_notify_command_complete(void);
|
||||
#else
|
||||
static int inline acpi_aml_init(void)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
static inline int acpi_aml_create_thread(acpi_osd_exec_callback function,
|
||||
void *context)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
static inline int acpi_aml_write_log(const char *msg)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
static inline int acpi_aml_read_cmd(char *buffer, u32 buffer_length)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
static inline int acpi_aml_wait_command_ready(void)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
static inline int acpi_aml_notify_command_complete(void)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /* _LINUX_ACPI_DBG_H */
|
||||
Loading…
Reference in a new issue