linux-kernel - [DEBUG 13/21] powerpc/mm: Identify coherent device memory nodes during platform init

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Date:   Mon, 30 Jan 2017 09:05:54 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     mhocko@...e.com, vbabka@...e.cz, mgorman@...e.de,
        minchan@...nel.org, aneesh.kumar@...ux.vnet.ibm.com,
        bsingharora@...il.com, srikar@...ux.vnet.ibm.com,
        haren@...ux.vnet.ibm.com, jglisse@...hat.com,
        dave.hansen@...el.com, dan.j.williams@...el.com
Subject: [DEBUG 13/21] powerpc/mm: Identify coherent device memory nodes during platform init

Coherent device memory nodes will have "ibm,hotplug-aperture" as one of the
compatible properties in their respective device nodes in the device tree.
Detect them early during NUMA platform initialization and mark them as such
in the node_to_phys_device_map[] array which in turn is used to support the
arch_check_cdm_node() function for the core VM.

Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
---
 arch/powerpc/mm/numa.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 9c73fbe..6def078 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -41,10 +41,12 @@
 #include <asm/setup.h>
 #include <asm/vdso.h>
 
+static int node_to_phys_device_map[MAX_NUMNODES];
+
 #ifdef CONFIG_COHERENT_DEVICE
 int arch_check_node_cdm(int nid)
 {
-	return 0;
+	return node_to_phys_device_map[nid];
 }
 #endif
 
@@ -790,6 +792,9 @@ static int __init parse_numa_properties(void)
 		if (nid < 0)
 			nid = default_nid;
 
+		if (of_device_is_compatible(memory, "ibm,hotplug-aperture"))
+			node_to_phys_device_map[nid] = 1;
+
 		fake_numa_create_new_node(((start + size) >> PAGE_SHIFT), &nid);
 		node_set_online(nid);
 
-- 
2.9.3