v4.19.13 snapshot.
diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
new file mode 100644
index 0000000..0e7fc3e
--- /dev/null
+++ b/drivers/gpu/drm/drm_print.c
@@ -0,0 +1,255 @@
+/*
+ * 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>
+ */
+
+#define DEBUG /* for pr_debug() */
+
+#include <stdarg.h>
+#include <linux/seq_file.h>
+#include <drm/drmP.h>
+#include <drm/drm_print.h>
+
+void __drm_puts_coredump(struct drm_printer *p, const char *str)
+{
+ struct drm_print_iterator *iterator = p->arg;
+ ssize_t len;
+
+ if (!iterator->remain)
+ return;
+
+ if (iterator->offset < iterator->start) {
+ ssize_t copy;
+
+ len = strlen(str);
+
+ if (iterator->offset + len <= iterator->start) {
+ iterator->offset += len;
+ return;
+ }
+
+ copy = len - (iterator->start - iterator->offset);
+
+ if (copy > iterator->remain)
+ copy = iterator->remain;
+
+ /* Copy out the bit of the string that we need */
+ memcpy(iterator->data,
+ str + (iterator->start - iterator->offset), copy);
+
+ iterator->offset = iterator->start + copy;
+ iterator->remain -= copy;
+ } else {
+ ssize_t pos = iterator->offset - iterator->start;
+
+ len = min_t(ssize_t, strlen(str), iterator->remain);
+
+ memcpy(iterator->data + pos, str, len);
+
+ iterator->offset += len;
+ iterator->remain -= len;
+ }
+}
+EXPORT_SYMBOL(__drm_puts_coredump);
+
+void __drm_printfn_coredump(struct drm_printer *p, struct va_format *vaf)
+{
+ struct drm_print_iterator *iterator = p->arg;
+ size_t len;
+ char *buf;
+
+ if (!iterator->remain)
+ return;
+
+ /* Figure out how big the string will be */
+ len = snprintf(NULL, 0, "%pV", vaf);
+
+ /* This is the easiest path, we've already advanced beyond the offset */
+ if (iterator->offset + len <= iterator->start) {
+ iterator->offset += len;
+ return;
+ }
+
+ /* Then check if we can directly copy into the target buffer */
+ if ((iterator->offset >= iterator->start) && (len < iterator->remain)) {
+ ssize_t pos = iterator->offset - iterator->start;
+
+ snprintf(((char *) iterator->data) + pos,
+ iterator->remain, "%pV", vaf);
+
+ iterator->offset += len;
+ iterator->remain -= len;
+
+ return;
+ }
+
+ /*
+ * Finally, hit the slow path and make a temporary string to copy over
+ * using _drm_puts_coredump
+ */
+ buf = kmalloc(len + 1, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
+ if (!buf)
+ return;
+
+ snprintf(buf, len + 1, "%pV", vaf);
+ __drm_puts_coredump(p, (const char *) buf);
+
+ kfree(buf);
+}
+EXPORT_SYMBOL(__drm_printfn_coredump);
+
+void __drm_puts_seq_file(struct drm_printer *p, const char *str)
+{
+ seq_puts(p->arg, str);
+}
+EXPORT_SYMBOL(__drm_puts_seq_file);
+
+void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf)
+{
+ seq_printf(p->arg, "%pV", vaf);
+}
+EXPORT_SYMBOL(__drm_printfn_seq_file);
+
+void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf)
+{
+ dev_info(p->arg, "[" DRM_NAME "] %pV", vaf);
+}
+EXPORT_SYMBOL(__drm_printfn_info);
+
+void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf)
+{
+ pr_debug("%s %pV", p->prefix, vaf);
+}
+EXPORT_SYMBOL(__drm_printfn_debug);
+
+/**
+ * drm_puts - print a const string to a &drm_printer stream
+ * @p: the &drm printer
+ * @str: const string
+ *
+ * Allow &drm_printer types that have a constant string
+ * option to use it.
+ */
+void drm_puts(struct drm_printer *p, const char *str)
+{
+ if (p->puts)
+ p->puts(p, str);
+ else
+ drm_printf(p, "%s", str);
+}
+EXPORT_SYMBOL(drm_puts);
+
+/**
+ * drm_printf - print to a &drm_printer stream
+ * @p: the &drm_printer
+ * @f: format string
+ */
+void drm_printf(struct drm_printer *p, const char *f, ...)
+{
+ va_list args;
+
+ va_start(args, f);
+ drm_vprintf(p, f, &args);
+ va_end(args);
+}
+EXPORT_SYMBOL(drm_printf);
+
+void drm_dev_printk(const struct device *dev, const char *level,
+ const char *format, ...)
+{
+ struct va_format vaf;
+ va_list args;
+
+ va_start(args, format);
+ vaf.fmt = format;
+ vaf.va = &args;
+
+ if (dev)
+ dev_printk(level, dev, "[" DRM_NAME ":%ps] %pV",
+ __builtin_return_address(0), &vaf);
+ else
+ printk("%s" "[" DRM_NAME ":%ps] %pV",
+ level, __builtin_return_address(0), &vaf);
+
+ va_end(args);
+}
+EXPORT_SYMBOL(drm_dev_printk);
+
+void drm_dev_dbg(const struct device *dev, unsigned int category,
+ const char *format, ...)
+{
+ struct va_format vaf;
+ va_list args;
+
+ if (!(drm_debug & category))
+ return;
+
+ va_start(args, format);
+ vaf.fmt = format;
+ vaf.va = &args;
+
+ if (dev)
+ dev_printk(KERN_DEBUG, dev, "[" DRM_NAME ":%ps] %pV",
+ __builtin_return_address(0), &vaf);
+ else
+ printk(KERN_DEBUG "[" DRM_NAME ":%ps] %pV",
+ __builtin_return_address(0), &vaf);
+
+ va_end(args);
+}
+EXPORT_SYMBOL(drm_dev_dbg);
+
+void drm_dbg(unsigned int category, const char *format, ...)
+{
+ struct va_format vaf;
+ va_list args;
+
+ if (!(drm_debug & category))
+ return;
+
+ va_start(args, format);
+ vaf.fmt = format;
+ vaf.va = &args;
+
+ printk(KERN_DEBUG "[" DRM_NAME ":%ps] %pV",
+ __builtin_return_address(0), &vaf);
+
+ va_end(args);
+}
+EXPORT_SYMBOL(drm_dbg);
+
+void drm_err(const char *format, ...)
+{
+ struct va_format vaf;
+ va_list args;
+
+ va_start(args, format);
+ vaf.fmt = format;
+ vaf.va = &args;
+
+ printk(KERN_ERR "[" DRM_NAME ":%ps] *ERROR* %pV",
+ __builtin_return_address(0), &vaf);
+
+ va_end(args);
+}
+EXPORT_SYMBOL(drm_err);