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drm: add drm_print_bits 

New helper to print named bits of some value (think flags fields).

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: http://patchwork.freedesktop.org/patch/msgid/20190904054740.20817-2-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2019-09-04 07:47:34 +02:00
parent 2236439bc6
commit 2dc5d44ccc
2 changed files with 36 additions and 0 deletions
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33
drivers/gpu/drm/drm_print.c
View File

@ -185,6 +185,39 @@ void drm_printf(struct drm_printer *p, const char *f, ...)
}
EXPORT_SYMBOL(drm_printf);
/**
* drm_print_bits - print bits to a &drm_printer stream
*
* Print bits (in flag fields for example) in human readable form.
* The first name in the @bits array is for the bit indexed by @from.
*
* @p: the &drm_printer
* @value: field value.
* @bits: Array with bit names.
* @from: start of bit range to print (inclusive).
* @to: end of bit range to print (exclusive).
*/
void drm_print_bits(struct drm_printer *p,
unsigned long value, const char *bits[],
unsigned int from, unsigned int to)
{
bool first = true;
unsigned int i;
for (i = from; i < to; i++) {
if (!(value & (1 << i)))
continue;
if (WARN_ON_ONCE(!bits[i-from]))
continue;
drm_printf(p, "%s%s", first ? "" : ",",
bits[i-from]);
first = false;
}
if (first)
drm_printf(p, "(none)");
}
EXPORT_SYMBOL(drm_print_bits);
void drm_dev_printk(const struct device *dev, const char *level,
const char *format, ...)
{

3
include/drm/drm_print.h
View File

@ -89,6 +89,9 @@ __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 *bits[],
unsigned int from, unsigned int to);
__printf(2, 0)
/**