diff options
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/Kconfig | 16 | ||||
| -rw-r--r-- | drivers/acpi/Makefile | 2 | ||||
| -rw-r--r-- | drivers/acpi/acpi_dbg.c | 80 | ||||
| -rw-r--r-- | drivers/acpi/bus.c | 3 | ||||
| -rw-r--r-- | drivers/acpi/osl.c | 207 |
5 files changed, 269 insertions, 39 deletions
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index 2a7e6d4c3edc..82b96ee8624c 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -60,13 +60,23 @@ config ACPI_CCA_REQUIRED config ACPI_DEBUGGER bool "AML debugger interface" select ACPI_DEBUG - depends on DEBUG_FS help - Enable in-kernel debugging of AML facilities: statistics, internal - object dump, single step control method execution. + Enable in-kernel debugging of AML facilities: statistics, + internal object dump, single step control method execution. This is still under development, currently enabling this only results in the compilation of the ACPICA debugger files. +if ACPI_DEBUGGER + +config ACPI_DEBUGGER_USER + tristate "Userspace debugger accessiblity" + depends on DEBUG_FS + help + Export /sys/kernel/debug/acpi/acpidbg for userspace utilities + to access the debugger functionalities. + +endif + config ACPI_SLEEP bool depends on SUSPEND || HIBERNATION diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 102b5e610425..c6f236f1b510 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -50,7 +50,6 @@ acpi-y += sysfs.o acpi-y += property.o acpi-$(CONFIG_X86) += acpi_cmos_rtc.o acpi-$(CONFIG_DEBUG_FS) += debugfs.o -acpi-$(CONFIG_ACPI_DEBUGGER) += acpi_dbg.o acpi-$(CONFIG_ACPI_NUMA) += numa.o acpi-$(CONFIG_ACPI_PROCFS_POWER) += cm_sbs.o acpi-y += acpi_lpat.o @@ -80,6 +79,7 @@ obj-$(CONFIG_ACPI_EC_DEBUGFS) += ec_sys.o obj-$(CONFIG_ACPI_CUSTOM_METHOD)+= custom_method.o obj-$(CONFIG_ACPI_BGRT) += bgrt.o obj-$(CONFIG_ACPI_CPPC_LIB) += cppc_acpi.o +obj-$(CONFIG_ACPI_DEBUGGER_USER) += acpi_dbg.o # processor has its own "processor." module_param namespace processor-y := processor_driver.o diff --git a/drivers/acpi/acpi_dbg.c b/drivers/acpi/acpi_dbg.c index abc23b2fd5d3..381beb299bf7 100644 --- a/drivers/acpi/acpi_dbg.c +++ b/drivers/acpi/acpi_dbg.c @@ -21,7 +21,7 @@ #include <linux/proc_fs.h> #include <linux/debugfs.h> #include <linux/circ_buf.h> -#include <linux/acpi_dbg.h> +#include <linux/acpi.h> #include "internal.h" #define ACPI_AML_BUF_ALIGN (sizeof (acpi_size)) @@ -307,7 +307,7 @@ static int acpi_aml_readb_kern(void) * the debugger output and store the output into the debugger interface * buffer. Return the size of stored logs or errno. */ -ssize_t acpi_aml_write_log(const char *msg) +static ssize_t acpi_aml_write_log(const char *msg) { int ret = 0; int count = 0, size = 0; @@ -337,7 +337,6 @@ again: } return size > 0 ? size : ret; } -EXPORT_SYMBOL(acpi_aml_write_log); /* * acpi_aml_read_cmd() - Capture debugger input @@ -348,7 +347,7 @@ EXPORT_SYMBOL(acpi_aml_write_log); * the debugger input commands and store the input commands into the * debugger interface buffer. Return the size of stored commands or errno. */ -ssize_t acpi_aml_read_cmd(char *msg, size_t count) +static ssize_t acpi_aml_read_cmd(char *msg, size_t count) { int ret = 0; int size = 0; @@ -390,7 +389,6 @@ again: } return size > 0 ? size : ret; } -EXPORT_SYMBOL(acpi_aml_read_cmd); static int acpi_aml_thread(void *unsed) { @@ -427,7 +425,7 @@ static int acpi_aml_thread(void *unsed) * This function should be used to implement acpi_os_execute() which is * used by the ACPICA debugger to create the debugger thread. */ -int acpi_aml_create_thread(acpi_osd_exec_callback function, void *context) +static int acpi_aml_create_thread(acpi_osd_exec_callback function, void *context) { struct task_struct *t; @@ -449,30 +447,27 @@ int acpi_aml_create_thread(acpi_osd_exec_callback function, void *context) mutex_unlock(&acpi_aml_io.lock); return 0; } -EXPORT_SYMBOL(acpi_aml_create_thread); -int acpi_aml_wait_command_ready(void) +static int acpi_aml_wait_command_ready(bool single_step, + char *buffer, size_t length) { acpi_status status; - if (!acpi_gbl_method_executing) - acpi_os_printf("\n%1c ", ACPI_DEBUGGER_COMMAND_PROMPT); - else + if (single_step) acpi_os_printf("\n%1c ", ACPI_DEBUGGER_EXECUTE_PROMPT); + else + acpi_os_printf("\n%1c ", ACPI_DEBUGGER_COMMAND_PROMPT); - status = acpi_os_get_line(acpi_gbl_db_line_buf, - ACPI_DB_LINE_BUFFER_SIZE, NULL); + status = acpi_os_get_line(buffer, length, NULL); if (ACPI_FAILURE(status)) return -EINVAL; return 0; } -EXPORT_SYMBOL(acpi_aml_wait_command_ready); -int acpi_aml_notify_command_complete(void) +static int acpi_aml_notify_command_complete(void) { return 0; } -EXPORT_SYMBOL(acpi_aml_notify_command_complete); static int acpi_aml_open(struct inode *inode, struct file *file) { @@ -746,10 +741,23 @@ static const struct file_operations acpi_aml_operations = { .llseek = generic_file_llseek, }; +static const struct acpi_debugger_ops acpi_aml_debugger = { + .create_thread = acpi_aml_create_thread, + .read_cmd = acpi_aml_read_cmd, + .write_log = acpi_aml_write_log, + .wait_command_ready = acpi_aml_wait_command_ready, + .notify_command_complete = acpi_aml_notify_command_complete, +}; + int __init acpi_aml_init(void) { - if (!acpi_debugfs_dir) - return -ENOENT; + int ret = 0; + + if (!acpi_debugfs_dir) { + ret = -ENOENT; + goto err_exit; + } + /* Initialize AML IO interface */ mutex_init(&acpi_aml_io.lock); init_waitqueue_head(&acpi_aml_io.wait); @@ -759,21 +767,39 @@ int __init acpi_aml_init(void) S_IFREG | S_IRUGO | S_IWUSR, acpi_debugfs_dir, NULL, &acpi_aml_operations); - if (acpi_aml_dentry == NULL) - return -ENODEV; + if (acpi_aml_dentry == NULL) { + ret = -ENODEV; + goto err_exit; + } + ret = acpi_register_debugger(THIS_MODULE, &acpi_aml_debugger); + if (ret) + goto err_fs; acpi_aml_initialized = true; - return 0; + +err_fs: + if (ret) { + debugfs_remove(acpi_aml_dentry); + acpi_aml_dentry = NULL; + } +err_exit: + return ret; } -#if 0 void __exit acpi_aml_exit(void) { - /* TODO: Stop the in kernel debugger */ - if (acpi_aml_dentry) - debugfs_remove(acpi_aml_dentry); - acpi_aml_initialized = false; + if (acpi_aml_initialized) { + acpi_unregister_debugger(&acpi_aml_debugger); + if (acpi_aml_dentry) { + debugfs_remove(acpi_aml_dentry); + acpi_aml_dentry = NULL; + } + acpi_aml_initialized = false; + } } module_init(acpi_aml_init); module_exit(acpi_aml_exit); -#endif + +MODULE_AUTHOR("Lv Zheng"); +MODULE_DESCRIPTION("ACPI debugger userspace IO driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index 06fbba92099b..1a40111e1c86 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -37,7 +37,6 @@ #include <acpi/apei.h> #include <linux/dmi.h> #include <linux/suspend.h> -#include <linux/acpi_dbg.h> #include "internal.h" @@ -1095,7 +1094,7 @@ static int __init acpi_init(void) acpi_debugfs_init(); acpi_sleep_proc_init(); acpi_wakeup_device_init(); - acpi_aml_init(); + acpi_debugger_init(); return 0; } diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index 4c1339819bfc..bb66093b7799 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -40,7 +40,6 @@ #include <linux/list.h> #include <linux/jiffies.h> #include <linux/semaphore.h> -#include <linux/acpi_dbg.h> #include <asm/io.h> #include <asm/uaccess.h> @@ -221,6 +220,7 @@ void acpi_os_printf(const char *fmt, ...) acpi_os_vprintf(fmt, args); va_end(args); } +EXPORT_SYMBOL(acpi_os_printf); void acpi_os_vprintf(const char *fmt, va_list args) { @@ -235,7 +235,7 @@ void acpi_os_vprintf(const char *fmt, va_list args) printk(KERN_CONT "%s", buffer); } #else - if (acpi_aml_write_log(buffer) < 0) + if (acpi_debugger_write_log(buffer) < 0) printk(KERN_CONT "%s", buffer); #endif } @@ -1103,6 +1103,200 @@ static void acpi_os_execute_deferred(struct work_struct *work) kfree(dpc); } +#ifdef CONFIG_ACPI_DEBUGGER +static struct acpi_debugger acpi_debugger; +static bool acpi_debugger_initialized; + +int acpi_register_debugger(struct module *owner, + const struct acpi_debugger_ops *ops) +{ + int ret = 0; + + mutex_lock(&acpi_debugger.lock); + if (acpi_debugger.ops) { + ret = -EBUSY; + goto err_lock; + } + + acpi_debugger.owner = owner; + acpi_debugger.ops = ops; + +err_lock: + mutex_unlock(&acpi_debugger.lock); + return ret; +} +EXPORT_SYMBOL(acpi_register_debugger); + +void acpi_unregister_debugger(const struct acpi_debugger_ops *ops) +{ + mutex_lock(&acpi_debugger.lock); + if (ops == acpi_debugger.ops) { + acpi_debugger.ops = NULL; + acpi_debugger.owner = NULL; + } + mutex_unlock(&acpi_debugger.lock); +} +EXPORT_SYMBOL(acpi_unregister_debugger); + +int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context) +{ + int ret; + int (*func)(acpi_osd_exec_callback, void *); + struct module *owner; + + if (!acpi_debugger_initialized) + return -ENODEV; + mutex_lock(&acpi_debugger.lock); + if (!acpi_debugger.ops) { + ret = -ENODEV; + goto err_lock; + } + if (!try_module_get(acpi_debugger.owner)) { + ret = -ENODEV; + goto err_lock; + } + func = acpi_debugger.ops->create_thread; + owner = acpi_debugger.owner; + mutex_unlock(&acpi_debugger.lock); + + ret = func(function, context); + + mutex_lock(&acpi_debugger.lock); + module_put(owner); +err_lock: + mutex_unlock(&acpi_debugger.lock); + return ret; +} + +ssize_t acpi_debugger_write_log(const char *msg) +{ + ssize_t ret; + ssize_t (*func)(const char *); + struct module *owner; + + if (!acpi_debugger_initialized) + return -ENODEV; + mutex_lock(&acpi_debugger.lock); + if (!acpi_debugger.ops) { + ret = -ENODEV; + goto err_lock; + } + if (!try_module_get(acpi_debugger.owner)) { + ret = -ENODEV; + goto err_lock; + } + func = acpi_debugger.ops->write_log; + owner = acpi_debugger.owner; + mutex_unlock(&acpi_debugger.lock); + + ret = func(msg); + + mutex_lock(&acpi_debugger.lock); + module_put(owner); +err_lock: + mutex_unlock(&acpi_debugger.lock); + return ret; +} + +ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length) +{ + ssize_t ret; + ssize_t (*func)(char *, size_t); + struct module *owner; + + if (!acpi_debugger_initialized) + return -ENODEV; + mutex_lock(&acpi_debugger.lock); + if (!acpi_debugger.ops) { + ret = -ENODEV; + goto err_lock; + } + if (!try_module_get(acpi_debugger.owner)) { + ret = -ENODEV; + goto err_lock; + } + func = acpi_debugger.ops->read_cmd; + owner = acpi_debugger.owner; + mutex_unlock(&acpi_debugger.lock); + + ret = func(buffer, buffer_length); + + mutex_lock(&acpi_debugger.lock); + module_put(owner); +err_lock: + mutex_unlock(&acpi_debugger.lock); + return ret; +} + +int acpi_debugger_wait_command_ready(void) +{ + int ret; + int (*func)(bool, char *, size_t); + struct module *owner; + + if (!acpi_debugger_initialized) + return -ENODEV; + mutex_lock(&acpi_debugger.lock); + if (!acpi_debugger.ops) { + ret = -ENODEV; + goto err_lock; + } + if (!try_module_get(acpi_debugger.owner)) { + ret = -ENODEV; + goto err_lock; + } + func = acpi_debugger.ops->wait_command_ready; + owner = acpi_debugger.owner; + mutex_unlock(&acpi_debugger.lock); + + ret = func(acpi_gbl_method_executing, + acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE); + + mutex_lock(&acpi_debugger.lock); + module_put(owner); +err_lock: + mutex_unlock(&acpi_debugger.lock); + return ret; +} + +int acpi_debugger_notify_command_complete(void) +{ + int ret; + int (*func)(void); + struct module *owner; + + if (!acpi_debugger_initialized) + return -ENODEV; + mutex_lock(&acpi_debugger.lock); + if (!acpi_debugger.ops) { + ret = -ENODEV; + goto err_lock; + } + if (!try_module_get(acpi_debugger.owner)) { + ret = -ENODEV; + goto err_lock; + } + func = acpi_debugger.ops->notify_command_complete; + owner = acpi_debugger.owner; + mutex_unlock(&acpi_debugger.lock); + + ret = func(); + + mutex_lock(&acpi_debugger.lock); + module_put(owner); +err_lock: + mutex_unlock(&acpi_debugger.lock); + return ret; +} + +int __init acpi_debugger_init(void) +{ + mutex_init(&acpi_debugger.lock); + acpi_debugger_initialized = true; + return 0; +} +#endif + /******************************************************************************* * * FUNCTION: acpi_os_execute @@ -1130,7 +1324,7 @@ acpi_status acpi_os_execute(acpi_execute_type type, function, context)); if (type == OSL_DEBUGGER_MAIN_THREAD) { - ret = acpi_aml_create_thread(function, context); + ret = acpi_debugger_create_thread(function, context); 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; |