/* * 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>
*/
/* Do *not* use outside of drm_print.[ch]! */ externunsignedlong __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); * }
*/
/** * 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 { /* These names must match those in DYNAMIC_DEBUG_CLASSBITS */ /** * @DRM_UT_CORE: Used in the generic drm code: drm_ioctl.c, drm_mm.c, * drm_memory.c, ...
*/
DRM_UT_CORE, /** * @DRM_UT_DRIVER: Used in the vendor specific part of the driver: i915, * radeon, ... macro.
*/
DRM_UT_DRIVER, /** * @DRM_UT_KMS: Used in the modesetting code.
*/
DRM_UT_KMS, /** * @DRM_UT_PRIME: Used in the prime code.
*/
DRM_UT_PRIME, /** * @DRM_UT_ATOMIC: Used in the atomic code.
*/
DRM_UT_ATOMIC, /** * @DRM_UT_VBL: Used for verbose debug message in the vblank code.
*/
DRM_UT_VBL, /** * @DRM_UT_STATE: Used for verbose atomic state debugging.
*/
DRM_UT_STATE, /** * @DRM_UT_LEASE: Used in the lease code.
*/
DRM_UT_LEASE, /** * @DRM_UT_DP: Used in the DP code.
*/
DRM_UT_DP, /** * @DRM_UT_DRMRES: Used in the drm managed resources code.
*/
DRM_UT_DRMRES
};
#define drm_debug_enabled_instrumented(category) \
({ \
pr_debug("todo: is this frequent enough to optimize ?\n"); \
drm_debug_enabled_raw(category); \
})
#ifdefined(CONFIG_DRM_USE_DYNAMIC_DEBUG) /* * the drm.debug API uses dyndbg, so each drm_*dbg macro/callsite gets * a descriptor, and only enabled callsites are reachable. They use * the private macro to avoid re-testing the enable-bit.
*/ #define __drm_debug_enabled(category) true #define drm_debug_enabled(category) drm_debug_enabled_instrumented(category) #else #define __drm_debug_enabled(category) drm_debug_enabled_raw(category) #define drm_debug_enabled(category) drm_debug_enabled_raw(category) #endif
/** * 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, constchar *str); void *arg; constvoid *origin; constchar *prefix; struct { unsignedint series; unsignedint counter;
} line; enum drm_debug_category category;
};
__printf(2, 0) /** * drm_vprintf - print to a &drm_printer stream * @p: the &drm_printer * @fmt: format string * @va: the va_list
*/ staticinlinevoid
drm_vprintf(struct drm_printer *p, constchar *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
*/ staticinlinestruct 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_coredump_printer_is_full() - DRM coredump printer output is full * @p: DRM coredump printer * * DRM printer output is full, useful to short circuit coredump printing once * printer is full. * * RETURNS: * True if DRM coredump printer output buffer is full, False otherwise
*/ staticinlinebool drm_coredump_printer_is_full(struct drm_printer *p)
{ struct drm_print_iterator *iterator = p->arg;
if (p->printfn != __drm_printfn_coredump) returntrue;
return !iterator->remain;
}
/** * 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
*/ staticinlinestruct 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
*/ staticinlinestruct drm_printer drm_info_printer(struct device *dev)
{ struct drm_printer p = {
.printfn = __drm_printfn_info,
.arg = dev,
}; return p;
}
/** * drm_dbg_printer - construct a &drm_printer for drm device specific output * @drm: the &struct drm_device pointer, or NULL * @category: the debug category to use * @prefix: debug output prefix, or NULL for no prefix * * RETURNS: * The &drm_printer object
*/ staticinlinestruct drm_printer drm_dbg_printer(struct drm_device *drm, enum drm_debug_category category, constchar *prefix)
{ struct drm_printer p = {
.printfn = __drm_printfn_dbg,
.arg = drm,
.origin = (constvoid *)_THIS_IP_, /* it's fine as we will be inlined */
.prefix = prefix,
.category = category,
}; return p;
}
/** * drm_err_printer - construct a &drm_printer that outputs to drm_err() * @drm: the &struct drm_device pointer * @prefix: debug output prefix, or NULL for no prefix * * RETURNS: * The &drm_printer object
*/ staticinlinestruct drm_printer drm_err_printer(struct drm_device *drm, constchar *prefix)
{ struct drm_printer p = {
.printfn = __drm_printfn_err,
.arg = drm,
.prefix = prefix
}; return p;
}
/** * drm_line_printer - construct a &drm_printer that prefixes outputs with line numbers * @p: the &struct drm_printer which actually generates the output * @prefix: optional output prefix, or NULL for no prefix * @series: optional unique series identifier, or 0 to omit identifier in the output * * This printer can be used to increase the robustness of the captured output * to make sure we didn't lost any intermediate lines of the output. Helpful * while capturing some crash data. * * Example 1:: * * void crash_dump(struct drm_device *drm) * { * static unsigned int id; * struct drm_printer p = drm_err_printer(drm, "crash"); * struct drm_printer lp = drm_line_printer(&p, "dump", ++id); * * drm_printf(&lp, "foo"); * drm_printf(&lp, "bar"); * } * * Above code will print into the dmesg something like:: * * [ ] 0000:00:00.0: [drm] *ERROR* crash dump 1.1: foo * [ ] 0000:00:00.0: [drm] *ERROR* crash dump 1.2: bar * * Example 2:: * * void line_dump(struct device *dev) * { * struct drm_printer p = drm_info_printer(dev); * struct drm_printer lp = drm_line_printer(&p, NULL, 0); * * drm_printf(&lp, "foo"); * drm_printf(&lp, "bar"); * } * * Above code will print:: * * [ ] 0000:00:00.0: [drm] 1: foo * [ ] 0000:00:00.0: [drm] 2: bar * * RETURNS: * The &drm_printer object
*/ staticinlinestruct drm_printer drm_line_printer(struct drm_printer *p, constchar *prefix, unsignedint series)
{ struct drm_printer lp = {
.printfn = __drm_printfn_line,
.arg = p,
.prefix = prefix,
.line = { .series = series, },
}; return lp;
}
/* * struct device based logging * * Prefer drm_device based logging over device or printk based logging.
*/
/** * DRM_DEV_ERROR() - Error output. * * NOTE: this is deprecated in favor of drm_err() or dev_err(). * * @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. * * NOTE: this is deprecated in favor of drm_err_ratelimited() or * dev_err_ratelimited(). * * @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__); \
})
/* NOTE: this is deprecated in favor of drm_info() or dev_info(). */ #define DRM_DEV_INFO(dev, fmt, ...) \
drm_dev_printk(dev, KERN_INFO, fmt, ##__VA_ARGS__)
/* NOTE: this is deprecated in favor of drm_info_once() or dev_info_once(). */ #define DRM_DEV_INFO_ONCE(dev, fmt, ...) \
({ \ staticbool __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 * * NOTE: this is deprecated in favor of drm_dbg_core(). * * @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 * * NOTE: this is deprecated in favor of drm_dbg() or dev_dbg(). * * @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 * * NOTE: this is deprecated in favor of drm_dbg_kms(). * * @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.
*/
/* NOTE: this is deprecated in favor of pr_info(). */ #define DRM_INFO(fmt, ...) \
_DRM_PRINTK(, INFO, fmt, ##__VA_ARGS__) /* NOTE: this is deprecated in favor of pr_notice(). */ #define DRM_NOTE(fmt, ...) \
_DRM_PRINTK(, NOTICE, fmt, ##__VA_ARGS__) /* NOTE: this is deprecated in favor of pr_warn(). */ #define DRM_WARN(fmt, ...) \
_DRM_PRINTK(, WARNING, fmt, ##__VA_ARGS__)
/* NOTE: this is deprecated in favor of pr_info_once(). */ #define DRM_INFO_ONCE(fmt, ...) \
_DRM_PRINTK(_once, INFO, fmt, ##__VA_ARGS__) /* NOTE: this is deprecated in favor of pr_notice_once(). */ #define DRM_NOTE_ONCE(fmt, ...) \
_DRM_PRINTK(_once, NOTICE, fmt, ##__VA_ARGS__) /* NOTE: this is deprecated in favor of pr_warn_once(). */ #define DRM_WARN_ONCE(fmt, ...) \
_DRM_PRINTK(_once, WARNING, fmt, ##__VA_ARGS__)
/* NOTE: this is deprecated in favor of pr_err(). */ #define DRM_ERROR(fmt, ...) \
__drm_err(fmt, ##__VA_ARGS__)
/* NOTE: this is deprecated in favor of pr_err_ratelimited(). */ #define DRM_ERROR_RATELIMITED(fmt, ...) \
DRM_DEV_ERROR_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
/* NOTE: this is deprecated in favor of drm_dbg_core(NULL, ...). */ #define DRM_DEBUG(fmt, ...) \
__drm_dbg(DRM_UT_CORE, fmt, ##__VA_ARGS__)
/* NOTE: this is deprecated in favor of drm_dbg(NULL, ...). */ #define DRM_DEBUG_DRIVER(fmt, ...) \
__drm_dbg(DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
/* NOTE: this is deprecated in favor of drm_dbg_kms(NULL, ...). */ #define DRM_DEBUG_KMS(fmt, ...) \
__drm_dbg(DRM_UT_KMS, fmt, ##__VA_ARGS__)
/* NOTE: this is deprecated in favor of drm_dbg_prime(NULL, ...). */ #define DRM_DEBUG_PRIME(fmt, ...) \
__drm_dbg(DRM_UT_PRIME, fmt, ##__VA_ARGS__)
/* NOTE: this is deprecated in favor of drm_dbg_atomic(NULL, ...). */ #define DRM_DEBUG_ATOMIC(fmt, ...) \
__drm_dbg(DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
/* NOTE: this is deprecated in favor of drm_dbg_vbl(NULL, ...). */ #define DRM_DEBUG_VBL(fmt, ...) \
__drm_dbg(DRM_UT_VBL, fmt, ##__VA_ARGS__)
/* NOTE: this is deprecated in favor of drm_dbg_lease(NULL, ...). */ #define DRM_DEBUG_LEASE(fmt, ...) \
__drm_dbg(DRM_UT_LEASE, fmt, ##__VA_ARGS__)
/* NOTE: this is deprecated in favor of drm_dbg_dp(NULL, ...). */ #define DRM_DEBUG_DP(fmt, ...) \
__drm_dbg(DRM_UT_DP, 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: [drm] " format, \
dev_driver_string(__drm_to_dev(drm)), \
dev_name(__drm_to_dev(drm)), ## arg)
#define drm_WARN_ONCE(drm, condition, format, arg...) \
WARN_ONCE(condition, "%s %s: [drm] " format, \
dev_driver_string(__drm_to_dev(drm)), \
dev_name(__drm_to_dev(drm)), ## arg)
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