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Subject[PATCH 2/8] x86: add find_e820_area_node
Date
From: Yinghai Lu <yinghai@@kernel.org>

David Miller pointed out that early_res have problem to find node data on correct node
when we have
node0: [0, 2g), [4g, 6g), [10g, 14g)
node1: [6g, 10g), [14g, 18g)
the cross node case

the problem is there for x86 bits even before we are using early_res for bootmem replacement.
after early_res for bootmem replacement, alloc_bootmem_node still can get range on correct node

this patch is fixing problem before bootmem or early_res replacement for bootmem.

now only user is for x86 64bit numa to find node data.

the point is use early_node_map with find_e820_area_node()

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
arch/x86/include/asm/e820.h | 1 +
arch/x86/kernel/e820.c | 15 +++++++++++++++
arch/x86/mm/numa_64.c | 4 ++--
include/linux/mm.h | 2 ++
mm/page_alloc.c | 37 +++++++++++++++++++++++--------------
5 files changed, 43 insertions(+), 16 deletions(-)
diff --git a/arch/x86/include/asm/e820.h b/arch/x86/include/asm/e820.h
index ec8a52d..41553af 100644
--- a/arch/x86/include/asm/e820.h
+++ b/arch/x86/include/asm/e820.h
@@ -116,6 +116,7 @@ extern unsigned long end_user_pfn;

extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align);
extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align);
+u64 find_e820_area_node(int nid, u64 start, u64 end, u64 size, u64 align);
extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);
#include <linux/early_res.h>

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 740b440..05ee724 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -787,6 +787,21 @@ u64 __init find_e820_area_size(u64 start, u64 *sizep, u64 align)
return -1ULL;
}

+u64 __init find_e820_area_node(int nid, u64 start, u64 end, u64 size, u64 align)
+{
+ u64 addr;
+ /*
+ * need to call this function after e820_register_active_regions
+ * so early_node_map[] is set
+ */
+ addr = find_memory_core_early(nid, size, align, start, end);
+ if (addr != -1ULL)
+ return addr;
+
+ /* fallback, should already have start end in the node range */
+ return find_e820_area(start, end, size, align);
+}
+
/*
* pre allocated 4k and reserved it in e820
*/
diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
index 8948f47..ffc5ad5 100644
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -174,7 +174,7 @@ static void * __init early_node_mem(int nodeid, unsigned long start,
if (start < (MAX_DMA32_PFN<<PAGE_SHIFT) &&
end > (MAX_DMA32_PFN<<PAGE_SHIFT))
start = MAX_DMA32_PFN<<PAGE_SHIFT;
- mem = find_e820_area(start, end, size, align);
+ mem = find_e820_area_node(nodeid, start, end, size, align);
if (mem != -1L)
return __va(mem);

@@ -184,7 +184,7 @@ static void * __init early_node_mem(int nodeid, unsigned long start,
start = MAX_DMA32_PFN<<PAGE_SHIFT;
else
start = MAX_DMA_PFN<<PAGE_SHIFT;
- mem = find_e820_area(start, end, size, align);
+ mem = find_e820_area_node(nodeid, start, end, size, align);
if (mem != -1L)
return __va(mem);

diff --git a/include/linux/mm.h b/include/linux/mm.h
index e70f21b..5c2d17e 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1160,6 +1160,8 @@ extern void free_bootmem_with_active_regions(int nid,
unsigned long max_low_pfn);
int add_from_early_node_map(struct range *range, int az,
int nr_range, int nid);
+u64 __init find_memory_core_early(int nid, u64 size, u64 align,
+ u64 goal, u64 limit);
void *__alloc_memory_core_early(int nodeid, u64 size, u64 align,
u64 goal, u64 limit);
typedef int (*work_fn_t)(unsigned long, unsigned long, void *);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d03c946..eef3757 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3408,12 +3408,11 @@ int __init add_from_early_node_map(struct range *range, int az,
return nr_range;
}

-#ifdef CONFIG_NO_BOOTMEM
-void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
+#ifdef CONFIG_HAVE_EARLY_RES
+u64 __init find_memory_core_early(int nid, u64 size, u64 align,
u64 goal, u64 limit)
{
int i;
- void *ptr;

/* need to go over early_node_map to find out good range for node */
for_each_active_range_index_in_nid(i, nid) {
@@ -3430,20 +3429,30 @@ void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
if (addr == -1ULL)
continue;

-#if 0
- printk(KERN_DEBUG "alloc (nid=%d %llx - %llx) (%llx - %llx) %llx %llx => %llx\n",
- nid,
- ei_start, ei_last, goal, limit, size,
- align, addr);
+ return addr;
+ }
+
+ return -1ULL;
+}
#endif

- ptr = phys_to_virt(addr);
- memset(ptr, 0, size);
- reserve_early_without_check(addr, addr + size, "BOOTMEM");
- return ptr;
- }
+#ifdef CONFIG_NO_BOOTMEM
+void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
+ u64 goal, u64 limit)
+{
+ void *ptr;

- return NULL;
+ u64 addr;
+
+ addr = find_memory_core_early(nid, size, align, goal, limit);
+
+ if (addr == -1ULL)
+ return NULL;
+
+ ptr = phys_to_virt(addr);
+ memset(ptr, 0, size);
+ reserve_early_without_check(addr, addr + size, "BOOTMEM");
+ return ptr;
}
#endif

--
1.6.4.2


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