Author: jhibbits
Date: Sat May 19 03:45:38 2018
New Revision: 333825
URL: https://svnweb.freebsd.org/changeset/base/333825
Log:
Add yet another option for gathering available memory
On some POWER9 systems, 'reg' denotes the full memory in the system, while
'linux,usable-memory' denotes the usable memory. Some memory is reserved for
NVLink usage, so is partitioned off.
Submitted by: Breno Leitao
Modified:
head/sys/powerpc/ofw/ofw_machdep.c
Modified: head/sys/powerpc/ofw/ofw_machdep.c
==============================================================================
--- head/sys/powerpc/ofw/ofw_machdep.c Sat May 19 03:23:46 2018
(r333824)
+++ head/sys/powerpc/ofw/ofw_machdep.c Sat May 19 03:45:38 2018
(r333825)
@@ -342,6 +342,16 @@ ofw_mem_regions(struct mem_region *memp, int *memsz,
res = parse_ofw_memory(phandle, "reg", &memp[msz]);
msz += res/sizeof(struct mem_region);
+
+ /*
+ * On POWER9 Systems we might have both linux,usable-memory and
+ * reg properties. 'reg' denotes all available memory, but we
+ * must use 'linux,usable-memory', a subset, as some memory
+ * regions are reserved for NVLink.
+ */
+ if (OF_getproplen(phandle, "linux,usable-memory") >= 0)
+ res = parse_ofw_memory(phandle, "linux,usable-memory",
+ &availp[asz]);
if (OF_getproplen(phandle, "available") >= 0)
res = parse_ofw_memory(phandle, "available",
&availp[asz]);
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