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Subject: [PATCH] powerpc/pseries: Export maximum memory value
From: Aravinda Prasad <aravinda@linux.vnet.ibm.com>
To: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org
Date: Wed, 10 Oct 2018 15:52:59 +0530
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 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

This patch exports the maximum possible amount of memory
configured on the system via /proc/powerpc/lparcfg.

Signed-off-by: Aravinda Prasad <aravinda@linux.vnet.ibm.com>
---
 arch/powerpc/platforms/pseries/lparcfg.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/powerpc/platforms/pseries/lparcfg.c b/arch/powerpc/platforms/pseries/lparcfg.c
index 7c872dc..aa82f55 100644
--- a/arch/powerpc/platforms/pseries/lparcfg.c
+++ b/arch/powerpc/platforms/pseries/lparcfg.c
@@ -26,6 +26,7 @@
 #include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>
+#include <linux/hugetlb.h>
 #include <asm/lppaca.h>
 #include <asm/hvcall.h>
 #include <asm/firmware.h>
@@ -36,6 +37,7 @@
 #include <asm/vio.h>
 #include <asm/mmu.h>
 #include <asm/machdep.h>
+#include <asm/drmem.h>
 
 #include "pseries.h"
 
@@ -433,6 +435,16 @@ static void parse_em_data(struct seq_file *m)
 		seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
 }
 
+static void maxmem_data(struct seq_file *m)
+{
+	unsigned long maxmem = 0;
+
+	maxmem += drmem_info->n_lmbs * drmem_info->lmb_size;
+	maxmem += hugetlb_total_pages() * PAGE_SIZE;
+
+	seq_printf(m, "MaxMem=%ld\n", maxmem);
+}
+
 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 {
 	int partition_potential_processors;
@@ -491,6 +503,7 @@ static int pseries_lparcfg_data(struct seq_file *m, void *v)
 	seq_printf(m, "slb_size=%d\n", mmu_slb_size);
 #endif
 	parse_em_data(m);
+	maxmem_data(m);
 
 	return 0;
 }