[PATCH v2 04/13] x86, numa, acpi, memory-hotplug: Introduce hotplug info into struct numa_meminfo.

[Tang Chen]

Since Yinghai has implement "Allocate pagetable pages in local node", for a
node with hotpluggable memory, we have to allocate pagetable pages first, and
then reserve the rest as hotpluggable memory in memblock.

But the kernel parse SRAT first, and then initialize memory mapping. So we have
to remember the which memory ranges are hotpluggable for future usage.

When parsing SRAT, we added each memory range to numa_meminfo. So we can store
hotpluggable info in numa_meminfo.

This patch introduces a "bool hotpluggable" member into struct
numa_meminfo.

And modifies the following APIs' prototypes to support it:
   - numa_add_memblk()
   - numa_add_memblk_to()

And the following callers:
   - numaq_register_node()
   - dummy_numa_init()
   - amd_numa_init()
   - acpi_numa_memory_affinity_init() in x86

Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
---
 arch/x86/include/asm/numa.h     |    3 ++-
 arch/x86/kernel/apic/numaq_32.c |    2 +-
 arch/x86/mm/amdtopology.c       |    3 ++-
 arch/x86/mm/numa.c              |   10 +++++++---
 arch/x86/mm/numa_internal.h     |    1 +
 arch/x86/mm/srat.c              |    2 +-
 6 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/numa.h b/arch/x86/include/asm/numa.h
index 1b99ee5..73096b2 100644
--- a/arch/x86/include/asm/numa.h
+++ b/arch/x86/include/asm/numa.h
@@ -31,7 +31,8 @@ extern int numa_off;
 extern s16 __apicid_to_node[MAX_LOCAL_APIC];
 extern nodemask_t numa_nodes_parsed __initdata;
 
-extern int __init numa_add_memblk(int nodeid, u64 start, u64 end);
+extern int __init numa_add_memblk(int nodeid, u64 start, u64 end,
+				  bool hotpluggable);
 extern void __init numa_set_distance(int from, int to, int distance);
 
 static inline void set_apicid_to_node(int apicid, s16 node)
diff --git a/arch/x86/kernel/apic/numaq_32.c b/arch/x86/kernel/apic/numaq_32.c
index d661ee9..7a9c542 100644
--- a/arch/x86/kernel/apic/numaq_32.c
+++ b/arch/x86/kernel/apic/numaq_32.c
@@ -82,7 +82,7 @@ static inline void numaq_register_node(int node, struct sys_cfg_data *scd)
 	int ret;
 
 	node_set(node, numa_nodes_parsed);
-	ret = numa_add_memblk(node, start, end);
+	ret = numa_add_memblk(node, start, end, false);
 	BUG_ON(ret < 0);
 }
 
diff --git a/arch/x86/mm/amdtopology.c b/arch/x86/mm/amdtopology.c
index 5247d01..d521471 100644
--- a/arch/x86/mm/amdtopology.c
+++ b/arch/x86/mm/amdtopology.c
@@ -167,7 +167,8 @@ int __init amd_numa_init(void)
 			nodeid, base, limit);
 
 		prevbase = base;
-		numa_add_memblk(nodeid, base, limit);
+		/* Do not support memory hotplug for AMD cpu. */
+		numa_add_memblk(nodeid, base, limit, false);
 		node_set(nodeid, numa_nodes_parsed);
 	}
 
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 4f754e6..ecf37fd 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -134,6 +134,7 @@ void __init setup_node_to_cpumask_map(void)
 }
 
 static int __init numa_add_memblk_to(int nid, u64 start, u64 end,
+				     bool hotpluggable,
 				     struct numa_meminfo *mi)
 {
 	/* ignore zero length blks */
@@ -155,6 +156,7 @@ static int __init numa_add_memblk_to(int nid, u64 start, u64 end,
 	mi->blk[mi->nr_blks].start = start;
 	mi->blk[mi->nr_blks].end = end;
 	mi->blk[mi->nr_blks].nid = nid;
+	mi->blk[mi->nr_blks].hotpluggable = hotpluggable;
 	mi->nr_blks++;
 	return 0;
 }
@@ -179,15 +181,17 @@ void __init numa_remove_memblk_from(int idx, struct numa_meminfo *mi)
  * @nid: NUMA node ID of the new memblk
  * @start: Start address of the new memblk
  * @end: End address of the new memblk
+ * @hotpluggable: True if memblk is hotpluggable
  *
  * Add a new memblk to the default numa_meminfo.
  *
  * RETURNS:
  * 0 on success, -errno on failure.
  */
-int __init numa_add_memblk(int nid, u64 start, u64 end)
+int __init numa_add_memblk(int nid, u64 start, u64 end,
+			   bool hotpluggable)
 {
-	return numa_add_memblk_to(nid, start, end, &numa_meminfo);
+	return numa_add_memblk_to(nid, start, end, hotpluggable, &numa_meminfo);
 }
 
 /* Initialize NODE_DATA for a node on the local memory */
@@ -631,7 +635,7 @@ static int __init dummy_numa_init(void)
 	       0LLU, PFN_PHYS(max_pfn) - 1);
 
 	node_set(0, numa_nodes_parsed);
-	numa_add_memblk(0, 0, PFN_PHYS(max_pfn));
+	numa_add_memblk(0, 0, PFN_PHYS(max_pfn), false);
 
 	return 0;
 }
diff --git a/arch/x86/mm/numa_internal.h b/arch/x86/mm/numa_internal.h
index bb2fbcc..1ce4e6b 100644
--- a/arch/x86/mm/numa_internal.h
+++ b/arch/x86/mm/numa_internal.h
@@ -8,6 +8,7 @@ struct numa_memblk {
 	u64			start;
 	u64			end;
 	int			nid;
+	bool			hotpluggable;
 };
 
 struct numa_meminfo {
diff --git a/arch/x86/mm/srat.c b/arch/x86/mm/srat.c
index 5055fa7..f7f6fd4 100644
--- a/arch/x86/mm/srat.c
+++ b/arch/x86/mm/srat.c
@@ -171,7 +171,7 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 		goto out_err_bad_srat;
 	}
 
-	if (numa_add_memblk(node, start, end) < 0)
+	if (numa_add_memblk(node, start, end, hotpluggable) < 0)
 		goto out_err_bad_srat;
 
 	node_set(node, numa_nodes_parsed);
-- 
1.7.1

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