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authorLv Zheng <lv.zheng@intel.com>2015-12-03 05:42:46 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-12-15 02:17:43 +0300
commitf8d31489629c125806ce4bf587c0c5c284d6d113 (patch)
treed6bd3938fab6e5284e111fd5dc8cbecd7fae2bfb /include/acpi/acpiosxf.h
parent96889231fbc047be91a49d953f50c9f747bc9f89 (diff)
downloadlinux-f8d31489629c125806ce4bf587c0c5c284d6d113.tar.xz
ACPICA: Debugger: Convert some mechanisms to OSPM specific
The following mechanisms are OSPM specific: 1. Redirect output destination to console: no file redirection will be needed by an in-kernel debugger, there is even no file can be accessed when the debugger is running in the kernel mode. 2. Output command prompts: programs other than acpiexec can have different prompt characters and the prompt characters may be implemented as a special character sequence to form a char device IO protocol. 3. Command ready/complete handshake: OSPM debugger may wait more conditions to implement OSPM specific semantics (for example, FIFO full/empty conditions for O_NONBLOCK or IO open/close conditions). Leaving such OSPM specific stuffs in the ACPICA debugger core blocks Linux debugger IO driver implementation. Several new OSL APIs are provided by this patch: 1. acpi_os_initialize_command_signals: initialize command handshake mechanism or any other OSPM specific stuffs. 2. acpi_os_terminate_command_signals: reversal of acpi_os_initialize_command_signals. 3. acpi_os_wait_command_ready: putting debugger task into wait state when a command is not ready. OSPMs can terminate command loop by returning AE_CTRL_TERMINATE from this API. Normally, wait_event() or wait_for_multiple_object() may be used to implement this API. 4. acpi_os_notify_command_complete: putting user task into running state when a command has been completed. OSPMs can terminate command loop by returning AE_CTRL_TERMINATE from this API. Normally, wake_up() or set_event() may be used to implement this API. This patch also converts current command signaling implementation into a generic debugger layer (osgendbg.c) to be used by the existing OSPMs or acpiexec, in return, Linux can have chance to implement its own command handshake mechanism. This patch also implements acpiexec batch mode in a multi-threading mode comaptible style as a demo (this can be confirmed by configuring acpiexec into DEBUGGER_MULTI_THREADED mode where the batch mode is still working). Lv Zheng. Note that the OSPM specific command handshake mechanism is required by Linux kernel because: 1. Linux kernel trends to use wait queue to synchronize two threads, using mutexes to achieve that will cause false "dead lock" warnings. 2. The command handshake mechanism implemented by ACPICA is implemented in this way because of a design issue in debugger IO streaming. Debugger IO outputs are simply cached using a giant buffer, this should be tuned by Linux in the future. Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/acpi/acpiosxf.h')
-rw-r--r--include/acpi/acpiosxf.h18
1 files changed, 17 insertions, 1 deletions
diff --git a/include/acpi/acpiosxf.h b/include/acpi/acpiosxf.h
index fbc2baf2b9dc..0d824a28522d 100644
--- a/include/acpi/acpiosxf.h
+++ b/include/acpi/acpiosxf.h
@@ -349,12 +349,28 @@ void acpi_os_redirect_output(void *destination);
#endif
/*
- * Debug input
+ * Debug IO
*/
#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_line
acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read);
#endif
+#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_initialize_command_signals
+acpi_status acpi_os_initialize_command_signals(void);
+#endif
+
+#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_terminate_command_signals
+void acpi_os_terminate_command_signals(void);
+#endif
+
+#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_wait_command_ready
+acpi_status acpi_os_wait_command_ready(void);
+#endif
+
+#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_notify_command_complete
+acpi_status acpi_os_notify_command_complete(void);
+#endif
+
/*
* Obtain ACPI table(s)
*/