x86, NUMA: Initialize and use remap allocator from setup_node_bootmem()

setup_node_bootmem() is taken from 64bit and doesn't use remap
allocator.  It's about to be shared with 32bit so add support for it.
If NODE_DATA is remapped, it's noted in the debug message and node
locality check is skipped as the __pa() of the remapped address
doesn't reflect the actual physical address.

On 64bit, remap allocator becomes noop and doesn't affect the
behavior.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>

3 files changed, 34 insertions, 15 deletions

diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index b45caa39f7cf..a72317ae74c5 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -197,7 +197,9 @@ static void __init setup_node_bootmem(int nid, u64 start, u64 end)
         const u64 nd_low = PFN_PHYS(MAX_DMA_PFN);
         const u64 nd_high = PFN_PHYS(max_pfn_mapped);
         const size_t nd_size = roundup(sizeof(pg_data_t), PAGE_SIZE);
+        bool remapped = false;
         u64 nd_pa;
+        void *nd;
         int tnid;
 
         /*
@@ -207,34 +209,45 @@ static void __init setup_node_bootmem(int nid, u64 start, u64 end)
         if (end && (end - start) < NODE_MIN_SIZE)
                 return;
 
+        /* initialize remap allocator before aligning to ZONE_ALIGN */
+        init_alloc_remap(nid, start, end);
+
         start = roundup(start, ZONE_ALIGN);
 
         printk(KERN_INFO "Initmem setup node %d %016Lx-%016Lx\n",
                nid, start, end);
 
         /*
-         * Try to allocate node data on local node and then fall back to
-         * all nodes.  Never allocate in DMA zone.
+         * Allocate node data.  Try remap allocator first, node-local
+         * memory and then any node.  Never allocate in DMA zone.
          */
-        nd_pa = memblock_x86_find_in_range_node(nid, nd_low, nd_high,
+        nd = alloc_remap(nid, nd_size);
+        if (nd) {
+                nd_pa = __pa(nd);
+                remapped = true;
+        } else {
+                nd_pa = memblock_x86_find_in_range_node(nid, nd_low, nd_high,
                                                 nd_size, SMP_CACHE_BYTES);
-        if (nd_pa == MEMBLOCK_ERROR)
-                nd_pa = memblock_find_in_range(nd_low, nd_high,
-                                               nd_size, SMP_CACHE_BYTES);
-        if (nd_pa == MEMBLOCK_ERROR) {
-                pr_err("Cannot find %zu bytes in node %d\n", nd_size, nid);
-                return;
+                if (nd_pa == MEMBLOCK_ERROR)
+                        nd_pa = memblock_find_in_range(nd_low, nd_high,
+                                                nd_size, SMP_CACHE_BYTES);
+                if (nd_pa == MEMBLOCK_ERROR) {
+                        pr_err("Cannot find %zu bytes in node %d\n",
+                               nd_size, nid);
+                        return;
+                }
+                memblock_x86_reserve_range(nd_pa, nd_pa + nd_size, "NODE_DATA");
+                nd = __va(nd_pa);
         }
-        memblock_x86_reserve_range(nd_pa, nd_pa + nd_size, "NODE_DATA");
 
         /* report and initialize */
-        printk(KERN_INFO "  NODE_DATA [%016Lx - %016Lx]\n",
-               nd_pa, nd_pa + nd_size - 1);
+        printk(KERN_INFO "  NODE_DATA [%016Lx - %016Lx]%s\n",
+               nd_pa, nd_pa + nd_size - 1, remapped ? " (remapped)" : "");
         tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
-        if (tnid != nid)
+        if (!remapped && tnid != nid)
                 printk(KERN_INFO "    NODE_DATA(%d) on node %d\n", nid, tnid);
 
-        node_data[nid] = __va(nd_pa);
+        node_data[nid] = nd;
         memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
         NODE_DATA(nid)->node_id = nid;
         NODE_DATA(nid)->node_start_pfn = start >> PAGE_SHIFT;
diff --git a/arch/x86/mm/numa_32.c b/arch/x86/mm/numa_32.c
index 900863204be2..fbd558fe10bc 100644
--- a/arch/x86/mm/numa_32.c
+++ b/arch/x86/mm/numa_32.c
@@ -265,7 +265,7 @@ void resume_map_numa_kva(pgd_t *pgd_base)
  * opportunistically and the callers will fall back to other memory
  * allocation mechanisms on failure.
  */
-static __init void init_alloc_remap(int nid, u64 start, u64 end)
+void __init init_alloc_remap(int nid, u64 start, u64 end)
 {
         unsigned long start_pfn = start >> PAGE_SHIFT;
         unsigned long end_pfn = end >> PAGE_SHIFT;
diff --git a/arch/x86/mm/numa_internal.h b/arch/x86/mm/numa_internal.h
index ad86ec91e640..7178c3afe05e 100644
--- a/arch/x86/mm/numa_internal.h
+++ b/arch/x86/mm/numa_internal.h
@@ -21,6 +21,12 @@ void __init numa_reset_distance(void);
 
 void __init x86_numa_init(void);
 
+#ifdef CONFIG_X86_64
+static inline void init_alloc_remap(int nid, u64 start, u64 end)        { }
+#else
+void __init init_alloc_remap(int nid, u64 start, u64 end);
+#endif
+
 #ifdef CONFIG_NUMA_EMU
 void __init numa_emulation(struct numa_meminfo *numa_meminfo,
                            int numa_dist_cnt);