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drm: Add a helper function for printing a debugfs_regset32. 

The debugfs_regset32 is nice to use for reducing boilerplate in
dumping a bunch of regs in debugfs, but we also want to be able to
print to dmesg them at runtime for driver debugging.  drm_printer lets
us format debugfs and the printk the same way.

v2: Add some kerneldoc for the function (requested by danvet)

Signed-off-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20190220210343.28157-1-eric@anholt.net
Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com> (v1)
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Eric Anholt 2019-02-20 13:03:37 -08:00
parent 3f0b646e1a
commit 5f513cc89e
2 changed files with 30 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/gpu/drm/drm_print.c
View File

@ -253,3 +253,31 @@ void drm_err(const char *format, ...)
va_end(args);
}
EXPORT_SYMBOL(drm_err);
/**
* drm_print_regset32 - print the contents of registers to a
* &drm_printer stream.
*
* @p: the &drm printer
* @regset: the list of registers to print.
*
* Often in driver debug, it's useful to be able to either capture the
* contents of registers in the steady state using debugfs or at
* specific points during operation. This lets the driver have a
* single list of registers for both.
*/
void drm_print_regset32(struct drm_printer *p, struct debugfs_regset32 *regset)
{
int namelen = 0;
int i;
for (i = 0; i < regset->nregs; i++)
namelen = max(namelen, (int)strlen(regset->regs[i].name));
for (i = 0; i < regset->nregs; i++) {
drm_printf(p, "%*s = 0x%08x\n",
namelen, regset->regs[i].name,
readl(regset->base + regset->regs[i].offset));
}
}
EXPORT_SYMBOL(drm_print_regset32);

2
include/drm/drm_print.h
View File

@ -30,6 +30,7 @@
#include <linux/printk.h>
#include <linux/seq_file.h>
#include <linux/device.h>
#include <linux/debugfs.h>
/**
* DOC: print
@ -84,6 +85,7 @@ void __drm_printfn_debug(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);
__printf(2, 0)
/**