Author: markj
Date: Mon Jul 3 02:01:16 2017
New Revision: 320580
URL: https://svnweb.freebsd.org/changeset/base/320580
Log:
Let io_mapping_init_wc() fall back to an uncacheable mapping.
This allows usage of the function on architectures that don't support
write-combining.
Reported by: bz, emaste
X-MFC With: r320196
Modified:
head/sys/compat/linuxkpi/common/include/linux/io-mapping.h
Modified: head/sys/compat/linuxkpi/common/include/linux/io-mapping.h
==============================================================================
--- head/sys/compat/linuxkpi/common/include/linux/io-mapping.h Sun Jul 2
21:00:30 2017 (r320579)
+++ head/sys/compat/linuxkpi/common/include/linux/io-mapping.h Mon Jul 3
02:01:16 2017 (r320580)
@@ -53,8 +53,13 @@ io_mapping_init_wc(struct io_mapping *mapping, resourc
mapping->base = base;
mapping->size = size;
+#ifdef VM_MEMATTR_WRITE_COMBINING
mapping->mem = ioremap_wc(base, size);
mapping->attr = VM_MEMATTR_WRITE_COMBINING;
+#else
+ mapping->mem = ioremap_nocache(base, size);
+ mapping->attr = VM_MEMATTR_UNCACHEABLE;
+#endif
return (mapping);
}
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