From 5f513cc89edfbb395b71ebf09d971666e23758db Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Wed, 20 Feb 2019 13:03:37 -0800 Subject: [PATCH] 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 Link: https://patchwork.freedesktop.org/patch/msgid/20190220210343.28157-1-eric@anholt.net Reviewed-by: Paul Kocialkowski (v1) Reviewed-by: Daniel Vetter --- drivers/gpu/drm/drm_print.c | 28 ++++++++++++++++++++++++++++ include/drm/drm_print.h | 2 ++ 2 files changed, 30 insertions(+) diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c index 0e7fc3e7dfb4..f5cb0aabfe35 100644 --- a/drivers/gpu/drm/drm_print.c +++ b/drivers/gpu/drm/drm_print.c @@ -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); diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h index afbc3beef089..3a4247319e63 100644 --- a/include/drm/drm_print.h +++ b/include/drm/drm_print.h @@ -30,6 +30,7 @@ #include #include #include +#include /** * 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) /** -- 2.30.2