linux-kernel - [DEBUG 05/10] powerpc/mm: Identify isolation seeking coherent memory nodes during boot

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Date:   Mon, 24 Oct 2016 10:12:24 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     mhocko@...e.com, js1304@...il.com, vbabka@...e.cz, mgorman@...e.de,
        minchan@...nel.org, akpm@...ux-foundation.org,
        aneesh.kumar@...ux.vnet.ibm.com, bsingharora@...il.com
Subject: [DEBUG 05/10] powerpc/mm: Identify isolation seeking coherent memory nodes during boot

Isolation seeking coherent memory nodes which wish to be MNODE_ISOLATION
in core VM will have "ibm,hotplug-aperture" as one of the compatible
properties in their respective device nodes in device tree. Detect them
during platform NUMA initialization and mark their respective coherent
mask in pglist_data structure as MNODE_ISOLATION.

Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
---
 arch/powerpc/mm/numa.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 5010181..89ae64c 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -64,6 +64,7 @@ static int form1_affinity;
 static int distance_ref_points_depth;
 static const __be32 *distance_ref_points;
 static int distance_lookup_table[MAX_NUMNODES][MAX_DISTANCE_REF_POINTS];
+static int node_to_phys_device_map[MAX_NUMNODES];
 
 /*
  * Allocate node_to_cpumask_map based on number of available nodes
@@ -714,6 +715,17 @@ static const struct of_device_id memory_match[] = {
 	{ /* sentinel */ }
 };
 
+int arch_get_memory_phys_device(unsigned long start_pfn)
+{
+	return node_to_phys_device_map[pfn_to_nid(start_pfn)];
+}
+
+int special_mem_node(int nid)
+{
+	return node_to_phys_device_map[nid];
+}
+EXPORT_SYMBOL(special_mem_node);
+
 static int __init parse_numa_properties(void)
 {
 	struct device_node *memory;
@@ -789,6 +801,9 @@ 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);
 
@@ -908,6 +923,11 @@ static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
 	NODE_DATA(nid)->node_id = nid;
 	NODE_DATA(nid)->node_start_pfn = start_pfn;
 	NODE_DATA(nid)->node_spanned_pages = spanned_pages;
+
+#ifdef CONFIG_COHERENT_DEVICE
+	if (special_mem_node(nid))
+		set_cdm_isolation(nid);
+#endif
 }
 
 void __init initmem_init(void)
-- 
2.1.0