[PATCH 1/7] drm: Add a helper function for printing a debugfs_regset32.

From: Eric Anholt
Date: Wed Feb 20 2019 - 16:03:50 EST


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.

Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
---
drivers/gpu/drm/drm_print.c | 16 ++++++++++++++++
include/drm/drm_print.h | 2 ++
2 files changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
index 0e7fc3e7dfb4..5ecc0f04cd0c 100644
--- a/drivers/gpu/drm/drm_print.c
+++ b/drivers/gpu/drm/drm_print.c
@@ -253,3 +253,19 @@ void drm_err(const char *format, ...)
va_end(args);
}
EXPORT_SYMBOL(drm_err);
+
+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 <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)
/**
--
2.20.1