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/*
* Copyright (C) 2016 Red Hat
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors:
* Rob Clark <robdclark@gmail.com>
*/
#ifndef DRM_PRINT_H_
#define DRM_PRINT_H_
#include <linux/compiler.h>
#include <linux/printk.h>
#include <linux/seq_file.h>
#include <linux/device.h>
#include <linux/debugfs.h>
#include <drm/drm.h>
/* Do *not* use outside of drm_print.[ch]! */
extern unsigned int __drm_debug;
/**
* DOC: print
*
* A simple wrapper for dev_printk(), seq_printf(), etc. Allows same
* debug code to be used for both debugfs and printk logging.
*
* For example::
*
* void log_some_info(struct drm_printer *p)
* {
* drm_printf(p, "foo=%d\n", foo);
* drm_printf(p, "bar=%d\n", bar);
* }
*
* #ifdef CONFIG_DEBUG_FS
* void debugfs_show(struct seq_file *f)
* {
* struct drm_printer p = drm_seq_file_printer(f);
* log_some_info(&p);
* }
* #endif
*
* void some_other_function(...)
* {
* struct drm_printer p = drm_info_printer(drm->dev);
* log_some_info(&p);
* }
*/
/**
* struct drm_printer - drm output "stream"
*
* Do not use struct members directly. Use drm_printer_seq_file(),
* drm_printer_info(), etc to initialize. And drm_printf() for output.
*/
struct drm_printer {
/* private: */
void (*printfn)(struct drm_printer *p, struct va_format *vaf);
void (*puts)(struct drm_printer *p, const char *str);
void *arg;
const char *prefix;
};
void __drm_printfn_coredump(struct drm_printer *p, struct va_format *vaf);
void __drm_puts_coredump(struct drm_printer *p, const char *str);
void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf);
void __drm_puts_seq_file(struct drm_printer *p, const char *str);
void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf);
void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf);
void __drm_printfn_err(struct drm_printer *p, struct va_format *vaf);
__printf(2, 3)
void drm_printf(struct drm_printer *p, const char *f, ...);
void drm_puts(struct drm_printer *p, const char *str);
void drm_print_regset32(struct drm_printer *p, struct debugfs_regset32 *regset);
void drm_print_bits(struct drm_printer *p, unsigned long value,
const char * const bits[], unsigned int nbits);
__printf(2, 0)
/**
* drm_vprintf - print to a &drm_printer stream
* @p: the &drm_printer
* @fmt: format string
* @va: the va_list
*/
static inline void
drm_vprintf(struct drm_printer *p, const char *fmt, va_list *va)
{
struct va_format vaf = { .fmt = fmt, .va = va };
p->printfn(p, &vaf);
}
/**
* drm_printf_indent - Print to a &drm_printer stream with indentation
* @printer: DRM printer
* @indent: Tab indentation level (max 5)
* @fmt: Format string
*/
#define drm_printf_indent(printer, indent, fmt, ...) \
drm_printf((printer), "%.*s" fmt, (indent), "\t\t\t\t\tX", ##__VA_ARGS__)
/**
* struct drm_print_iterator - local struct used with drm_printer_coredump
* @data: Pointer to the devcoredump output buffer, can be NULL if using
* drm_printer_coredump to determine size of devcoredump
* @start: The offset within the buffer to start writing
* @remain: The number of bytes to write for this iteration
*/
struct drm_print_iterator {
void *data;
ssize_t start;
ssize_t remain;
/* private: */
ssize_t offset;
};
/**
* drm_coredump_printer - construct a &drm_printer that can output to a buffer
* from the read function for devcoredump
* @iter: A pointer to a struct drm_print_iterator for the read instance
*
* This wrapper extends drm_printf() to work with a dev_coredumpm() callback
* function. The passed in drm_print_iterator struct contains the buffer
* pointer, size and offset as passed in from devcoredump.
*
* For example::
*
* void coredump_read(char *buffer, loff_t offset, size_t count,
* void *data, size_t datalen)
* {
* struct drm_print_iterator iter;
* struct drm_printer p;
*
* iter.data = buffer;
* iter.start = offset;
* iter.remain = count;
*
* p = drm_coredump_printer(&iter);
*
* drm_printf(p, "foo=%d\n", foo);
* }
*
* void makecoredump(...)
* {
* ...
* dev_coredumpm(dev, THIS_MODULE, data, 0, GFP_KERNEL,
* coredump_read, ...)
* }
*
* The above example has a time complexity of O(N^2), where N is the size of the
* devcoredump. This is acceptable for small devcoredumps but scales poorly for
* larger ones.
*
* Another use case for drm_coredump_printer is to capture the devcoredump into
* a saved buffer before the dev_coredump() callback. This involves two passes:
* one to determine the size of the devcoredump and another to print it to a
* buffer. Then, in dev_coredump(), copy from the saved buffer into the
* devcoredump read buffer.
*
* For example::
*
* char *devcoredump_saved_buffer;
*
* ssize_t __coredump_print(char *buffer, ssize_t count, ...)
* {
* struct drm_print_iterator iter;
* struct drm_printer p;
*
* iter.data = buffer;
* iter.start = 0;
* iter.remain = count;
*
* p = drm_coredump_printer(&iter);
*
* drm_printf(p, "foo=%d\n", foo);
* ...
* return count - iter.remain;
* }
*
* void coredump_print(...)
* {
* ssize_t count;
*
* count = __coredump_print(NULL, INT_MAX, ...);
* devcoredump_saved_buffer = kvmalloc(count, GFP_KERNEL);
* __coredump_print(devcoredump_saved_buffer, count, ...);
* }
*
* void coredump_read(char *buffer, loff_t offset, size_t count,
* void *data, size_t datalen)
* {
* ...
* memcpy(buffer, devcoredump_saved_buffer + offset, count);
* ...
* }
*
* The above example has a time complexity of O(N*2), where N is the size of the
* devcoredump. This scales better than the previous example for larger
* devcoredumps.
*
* RETURNS:
* The &drm_printer object
*/
static inline struct drm_printer
drm_coredump_printer(struct drm_print_iterator *iter)
{
struct drm_printer p = {
.printfn = __drm_printfn_coredump,
.puts = __drm_puts_coredump,
.arg = iter,
};
/* Set the internal offset of the iterator to zero */
iter->offset = 0;
return p;
}
/**
* drm_seq_file_printer - construct a &drm_printer that outputs to &seq_file
* @f: the &struct seq_file to output to
*
* RETURNS:
* The &drm_printer object
*/
static inline struct drm_printer drm_seq_file_printer(struct seq_file *f)
{
struct drm_printer p = {
.printfn = __drm_printfn_seq_file,
.puts = __drm_puts_seq_file,
.arg = f,
};
return p;
}
/**
* drm_info_printer - construct a &drm_printer that outputs to dev_printk()
* @dev: the &struct device pointer
*
* RETURNS:
* The &drm_printer object
*/
static inline struct drm_printer drm_info_printer(struct device *dev)
{
struct drm_printer p = {
.printfn = __drm_printfn_info,
.arg = dev,
};
return p;
}
/**
* drm_debug_printer - construct a &drm_printer that outputs to pr_debug()
* @prefix: debug output prefix
*
* RETURNS:
* The &drm_printer object
*/
static inline struct drm_printer drm_debug_printer(const char *prefix)
{
struct drm_printer p = {
.printfn = __drm_printfn_debug,
.prefix = prefix
};
return p;
}
/**
* drm_err_printer - construct a &drm_printer that outputs to pr_err()
* @prefix: debug output prefix
*
* RETURNS:
* The &drm_printer object
*/
static inline struct drm_printer drm_err_printer(const char *prefix)
{
struct drm_printer p = {
.printfn = __drm_printfn_err,
.prefix = prefix
};
return p;
}
/**
* enum drm_debug_category - The DRM debug categories
*
* Each of the DRM debug logging macros use a specific category, and the logging
* is filtered by the drm.debug module parameter. This enum specifies the values
* for the interface.
*
* Each DRM_DEBUG_<CATEGORY> macro logs to DRM_UT_<CATEGORY> category, except
* DRM_DEBUG() logs to DRM_UT_CORE.
*
* Enabling verbose debug messages is done through the drm.debug parameter, each
* category being enabled by a bit:
*
* - drm.debug=0x1 will enable CORE messages
* - drm.debug=0x2 will enable DRIVER messages
* - drm.debug=0x3 will enable CORE and DRIVER messages
* - ...
* - drm.debug=0x1ff will enable all messages
*
* An interesting feature is that it's possible to enable verbose logging at
* run-time by echoing the debug value in its sysfs node::
*
* # echo 0xf > /sys/module/drm/parameters/debug
*
*/
enum drm_debug_category {
/**
* @DRM_UT_CORE: Used in the generic drm code: drm_ioctl.c, drm_mm.c,
* drm_memory.c, ...
*/
DRM_UT_CORE = 0x01,
/**
* @DRM_UT_DRIVER: Used in the vendor specific part of the driver: i915,
* radeon, ... macro.
*/
DRM_UT_DRIVER = 0x02,
/**
* @DRM_UT_KMS: Used in the modesetting code.
*/
DRM_UT_KMS = 0x04,
/**
* @DRM_UT_PRIME: Used in the prime code.
*/
DRM_UT_PRIME = 0x08,
/**
* @DRM_UT_ATOMIC: Used in the atomic code.
*/
DRM_UT_ATOMIC = 0x10,
/**
* @DRM_UT_VBL: Used for verbose debug message in the vblank code.
*/
DRM_UT_VBL = 0x20,
/**
* @DRM_UT_STATE: Used for verbose atomic state debugging.
*/
DRM_UT_STATE = 0x40,
/**
* @DRM_UT_LEASE: Used in the lease code.
*/
DRM_UT_LEASE = 0x80,
/**
* @DRM_UT_DP: Used in the DP code.
*/
DRM_UT_DP = 0x100,
/**
* @DRM_UT_DRMRES: Used in the drm managed resources code.
*/
DRM_UT_DRMRES = 0x200,
};
static inline bool drm_debug_enabled(enum drm_debug_category category)
{
return unlikely(__drm_debug & category);
}
/*
* struct device based logging
*
* Prefer drm_device based logging over device or printk based logging.
*/
__printf(3, 4)
void drm_dev_printk(const struct device *dev, const char *level,
const char *format, ...);
__printf(3, 4)
void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
const char *format, ...);
/**
* DRM_DEV_ERROR() - Error output.
*
* @dev: device pointer
* @fmt: printf() like format string.
*/
#define DRM_DEV_ERROR(dev, fmt, ...) \
drm_dev_printk(dev, KERN_ERR, "*ERROR* " fmt, ##__VA_ARGS__)
/**
* DRM_DEV_ERROR_RATELIMITED() - Rate limited error output.
*
* @dev: device pointer
* @fmt: printf() like format string.
*
* Like DRM_ERROR() but won't flood the log.
*/
#define DRM_DEV_ERROR_RATELIMITED(dev, fmt, ...) \
({ \
static DEFINE_RATELIMIT_STATE(_rs, \
DEFAULT_RATELIMIT_INTERVAL, \
DEFAULT_RATELIMIT_BURST); \
\
if (__ratelimit(&_rs)) \
DRM_DEV_ERROR(dev, fmt, ##__VA_ARGS__); \
})
#define DRM_DEV_INFO(dev, fmt, ...) \
drm_dev_printk(dev, KERN_INFO, fmt, ##__VA_ARGS__)
#define DRM_DEV_INFO_ONCE(dev, fmt, ...) \
({ \
static bool __print_once __read_mostly; \
if (!__print_once) { \
__print_once = true; \
DRM_DEV_INFO(dev, fmt, ##__VA_ARGS__); \
} \
})
/**
* DRM_DEV_DEBUG() - Debug output for generic drm code
*
* @dev: device pointer
* @fmt: printf() like format string.
*/
#define DRM_DEV_DEBUG(dev, fmt, ...) \
drm_dev_dbg(dev, DRM_UT_CORE, fmt, ##__VA_ARGS__)
/**
* DRM_DEV_DEBUG_DRIVER() - Debug output for vendor specific part of the driver
*
* @dev: device pointer
* @fmt: printf() like format string.
*/
#define DRM_DEV_DEBUG_DRIVER(dev, fmt, ...) \
drm_dev_dbg(dev, DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
/**
* DRM_DEV_DEBUG_KMS() - Debug output for modesetting code
*
* @dev: device pointer
* @fmt: printf() like format string.
*/
#define DRM_DEV_DEBUG_KMS(dev, fmt, ...) \
drm_dev_dbg(dev, DRM_UT_KMS, fmt, ##__VA_ARGS__)
/*
* struct drm_device based logging
*
* Prefer drm_device based logging over device or prink based logging.
*/
/* Helper for struct drm_device based logging. */
#define __drm_printk(drm, level, type, fmt, ...) \
dev_##level##type((drm)->dev, "[drm] " fmt, ##__VA_ARGS__)
#define drm_info(drm, fmt, ...) \
__drm_printk((drm), info,, fmt, ##__VA_ARGS__)
#define drm_notice(drm, fmt, ...) \
__drm_printk((drm), notice,, fmt, ##__VA_ARGS__)
#define drm_warn(drm, fmt, ...) \
__drm_printk((drm), warn,, fmt, ##__VA_ARGS__)
#define drm_err(drm, fmt, ...) \
__drm_printk((drm), err,, "*ERROR* " fmt, ##__VA_ARGS__)
#define drm_info_once(drm, fmt, ...) \
__drm_printk((drm), info, _once, fmt, ##__VA_ARGS__)
#define drm_notice_once(drm, fmt, ...) \
__drm_printk((drm), notice, _once, fmt, ##__VA_ARGS__)
#define drm_warn_once(drm, fmt, ...) \
__drm_printk((drm), warn, _once, fmt, ##__VA_ARGS__)
#define drm_err_once(drm, fmt, ...) \
__drm_printk((drm), err, _once, "*ERROR* " fmt, ##__VA_ARGS__)
#define drm_err_ratelimited(drm, fmt, ...) \
__drm_printk((drm), err, _ratelimited, "*ERROR* " fmt, ##__VA_ARGS__)
#define drm_dbg_core(drm, fmt, ...) \
drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_CORE, fmt, ##__VA_ARGS__)
#define drm_dbg_driver(drm, fmt, ...) \
drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
#define drm_dbg_kms(drm, fmt, ...) \
drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_KMS, fmt, ##__VA_ARGS__)
#define drm_dbg_prime(drm, fmt, ...) \
drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_PRIME, fmt, ##__VA_ARGS__)
#define drm_dbg_atomic(drm, fmt, ...) \
drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
#define drm_dbg_vbl(drm, fmt, ...) \
drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_VBL, fmt, ##__VA_ARGS__)
#define drm_dbg_state(drm, fmt, ...) \
drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_STATE, fmt, ##__VA_ARGS__)
#define drm_dbg_lease(drm, fmt, ...) \
drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_LEASE, fmt, ##__VA_ARGS__)
#define drm_dbg_dp(drm, fmt, ...) \
drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_DP, fmt, ##__VA_ARGS__)
#define drm_dbg_drmres(drm, fmt, ...) \
drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_DRMRES, fmt, ##__VA_ARGS__)
#define drm_dbg(drm, fmt, ...) drm_dbg_driver(drm, fmt, ##__VA_ARGS__)
/*
* printk based logging
*
* Prefer drm_device based logging over device or prink based logging.
*/
__printf(2, 3)
void __drm_dbg(enum drm_debug_category category, const char *format, ...);
__printf(1, 2)
void __drm_err(const char *format, ...);
/* Macros to make printk easier */
#define _DRM_PRINTK(once, level, fmt, ...) \
printk##once(KERN_##level "[" DRM_NAME "] " fmt, ##__VA_ARGS__)
#define DRM_INFO(fmt, ...) \
_DRM_PRINTK(, INFO, fmt, ##__VA_ARGS__)
#define DRM_NOTE(fmt, ...) \
_DRM_PRINTK(, NOTICE, fmt, ##__VA_ARGS__)
#define DRM_WARN(fmt, ...) \
_DRM_PRINTK(, WARNING, fmt, ##__VA_ARGS__)
#define DRM_INFO_ONCE(fmt, ...) \
_DRM_PRINTK(_once, INFO, fmt, ##__VA_ARGS__)
#define DRM_NOTE_ONCE(fmt, ...) \
_DRM_PRINTK(_once, NOTICE, fmt, ##__VA_ARGS__)
#define DRM_WARN_ONCE(fmt, ...) \
_DRM_PRINTK(_once, WARNING, fmt, ##__VA_ARGS__)
#define DRM_ERROR(fmt, ...) \
__drm_err(fmt, ##__VA_ARGS__)
#define DRM_ERROR_RATELIMITED(fmt, ...) \
DRM_DEV_ERROR_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
#define DRM_DEBUG(fmt, ...) \
__drm_dbg(DRM_UT_CORE, fmt, ##__VA_ARGS__)
#define DRM_DEBUG_DRIVER(fmt, ...) \
__drm_dbg(DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
#define DRM_DEBUG_KMS(fmt, ...) \
__drm_dbg(DRM_UT_KMS, fmt, ##__VA_ARGS__)
#define DRM_DEBUG_PRIME(fmt, ...) \
__drm_dbg(DRM_UT_PRIME, fmt, ##__VA_ARGS__)
#define DRM_DEBUG_ATOMIC(fmt, ...) \
__drm_dbg(DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
#define DRM_DEBUG_VBL(fmt, ...) \
__drm_dbg(DRM_UT_VBL, fmt, ##__VA_ARGS__)
#define DRM_DEBUG_LEASE(fmt, ...) \
__drm_dbg(DRM_UT_LEASE, fmt, ##__VA_ARGS__)
#define DRM_DEBUG_DP(fmt, ...) \
__drm_dbg(DRM_UT_DP, fmt, ## __VA_ARGS__)
#define __DRM_DEFINE_DBG_RATELIMITED(category, drm, fmt, ...) \
({ \
static DEFINE_RATELIMIT_STATE(rs_, DEFAULT_RATELIMIT_INTERVAL, DEFAULT_RATELIMIT_BURST);\
const struct drm_device *drm_ = (drm); \
\
if (drm_debug_enabled(DRM_UT_ ## category) && __ratelimit(&rs_)) \
drm_dev_printk(drm_ ? drm_->dev : NULL, KERN_DEBUG, fmt, ## __VA_ARGS__); \
})
#define drm_dbg_kms_ratelimited(drm, fmt, ...) \
__DRM_DEFINE_DBG_RATELIMITED(KMS, drm, fmt, ## __VA_ARGS__)
#define DRM_DEBUG_KMS_RATELIMITED(fmt, ...) drm_dbg_kms_ratelimited(NULL, fmt, ## __VA_ARGS__)
/*
* struct drm_device based WARNs
*
* drm_WARN*() acts like WARN*(), but with the key difference of
* using device specific information so that we know from which device
* warning is originating from.
*
* Prefer drm_device based drm_WARN* over regular WARN*
*/
/* Helper for struct drm_device based WARNs */
#define drm_WARN(drm, condition, format, arg...) \
WARN(condition, "%s %s: " format, \
dev_driver_string((drm)->dev), \
dev_name((drm)->dev), ## arg)
#define drm_WARN_ONCE(drm, condition, format, arg...) \
WARN_ONCE(condition, "%s %s: " format, \
dev_driver_string((drm)->dev), \
dev_name((drm)->dev), ## arg)
#define drm_WARN_ON(drm, x) \
drm_WARN((drm), (x), "%s", \
"drm_WARN_ON(" __stringify(x) ")")
#define drm_WARN_ON_ONCE(drm, x) \
drm_WARN_ONCE((drm), (x), "%s", \
"drm_WARN_ON_ONCE(" __stringify(x) ")")
#endif /* DRM_PRINT_H_ */
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