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ACPI: Add acpi_handle_<level>() interfaces
This patch introduces acpi_handle_<level>(), where <level> is a kernel message level such as err/warn/info, to support improved logging messages for ACPI, esp. hot-plug operations. acpi_handle_<level>() appends "ACPI" prefix and ACPI object path to the messages. This improves diagnosis of hotplug operations since an error message in a log file identifies an object that caused an issue. This interface acquires the global namespace mutex to obtain an object path. In interrupt context, it shows the object path as <n/a>. acpi_handle_<level>() takes acpi_handle as an argument, which is passed to ACPI hotplug notify handlers from the ACPICA. Therefore, it is always available unlike other kernel objects, such as device. For example: acpi_handle_err(handle, "Device don't exist, dropping EJECT\n"); logs an error message like this at KERN_ERR. ACPI: \_SB_.SCK4.CPU4: Device don't exist, dropping EJECT ACPI hot-plug drivers can use acpi_handle_<level>() when they need to identify a target ACPI object path in their messages, such as error cases. The usage model is similar to dev_<level>(). acpi_handle_<level>() can be used when a device is not created or is invalid during hot-plug operations. ACPI object path is also consistent on the platform, unlike device name that gets incremented over hotplug operations. ACPI drivers should use dev_<level>() when a device object is valid. Device name provides more user friendly information, and avoids acquiring the global ACPI namespace mutex. ACPI drivers also continue to use pr_<level>() when they do not need to specify device information, such as boot-up messages. Note: ACPI_[WARNING|INFO|ERROR]() are intended for the ACPICA and are not associated with the kernel message level. Signed-off-by: Toshi Kani <toshi.kani@hp.com> Tested-by: Vijay Mohan Pandarathil <vijaymohan.pandarathil@hp.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -28,6 +28,8 @@
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/hardirq.h>
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#include <linux/acpi.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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@ -457,3 +459,39 @@ acpi_evaluate_hotplug_ost(acpi_handle handle, u32 source_event,
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#endif
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}
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EXPORT_SYMBOL(acpi_evaluate_hotplug_ost);
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/**
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* acpi_handle_printk: Print message with ACPI prefix and object path
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*
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* This function is called through acpi_handle_<level> macros and prints
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* a message with ACPI prefix and object path. This function acquires
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* the global namespace mutex to obtain an object path. In interrupt
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* context, it shows the object path as <n/a>.
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*/
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void
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acpi_handle_printk(const char *level, acpi_handle handle, const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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struct acpi_buffer buffer = {
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.length = ACPI_ALLOCATE_BUFFER,
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.pointer = NULL
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};
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const char *path;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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if (in_interrupt() ||
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acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer) != AE_OK)
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path = "<n/a>";
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else
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path = buffer.pointer;
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printk("%sACPI: %s: %pV", level, path, &vaf);
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va_end(args);
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kfree(buffer.pointer);
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}
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EXPORT_SYMBOL(acpi_handle_printk);
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@ -434,4 +434,47 @@ acpi_status acpi_os_prepare_sleep(u8 sleep_state,
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#define acpi_os_set_prepare_sleep(func, pm1a_ctrl, pm1b_ctrl) do { } while (0)
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#endif
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#ifdef CONFIG_ACPI
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__printf(3, 4)
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void acpi_handle_printk(const char *level, acpi_handle handle,
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const char *fmt, ...);
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#else /* !CONFIG_ACPI */
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static inline __printf(3, 4) void
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acpi_handle_printk(const char *level, void *handle, const char *fmt, ...) {}
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#endif /* !CONFIG_ACPI */
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/*
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* acpi_handle_<level>: Print message with ACPI prefix and object path
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*
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* These interfaces acquire the global namespace mutex to obtain an object
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* path. In interrupt context, it shows the object path as <n/a>.
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*/
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#define acpi_handle_emerg(handle, fmt, ...) \
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acpi_handle_printk(KERN_EMERG, handle, fmt, ##__VA_ARGS__)
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#define acpi_handle_alert(handle, fmt, ...) \
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acpi_handle_printk(KERN_ALERT, handle, fmt, ##__VA_ARGS__)
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#define acpi_handle_crit(handle, fmt, ...) \
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acpi_handle_printk(KERN_CRIT, handle, fmt, ##__VA_ARGS__)
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#define acpi_handle_err(handle, fmt, ...) \
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acpi_handle_printk(KERN_ERR, handle, fmt, ##__VA_ARGS__)
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#define acpi_handle_warn(handle, fmt, ...) \
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acpi_handle_printk(KERN_WARNING, handle, fmt, ##__VA_ARGS__)
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#define acpi_handle_notice(handle, fmt, ...) \
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acpi_handle_printk(KERN_NOTICE, handle, fmt, ##__VA_ARGS__)
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#define acpi_handle_info(handle, fmt, ...) \
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acpi_handle_printk(KERN_INFO, handle, fmt, ##__VA_ARGS__)
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/* REVISIT: Support CONFIG_DYNAMIC_DEBUG when necessary */
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#if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)
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#define acpi_handle_debug(handle, fmt, ...) \
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acpi_handle_printk(KERN_DEBUG, handle, fmt, ##__VA_ARGS__)
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#else
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#define acpi_handle_debug(handle, fmt, ...) \
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({ \
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if (0) \
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acpi_handle_printk(KERN_DEBUG, handle, fmt, ##__VA_ARGS__); \
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0; \
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})
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#endif
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#endif /*_LINUX_ACPI_H*/
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