[PATCH v2 08/22] memblock: Introduce a generic phys_addr_to_target_node()
From: Dan Williams
Date: Sun Jul 12 2020 - 12:43:11 EST
Similar to how generic memory_add_physaddr_to_nid() interrogates
memblock data for numa information, introduce
get_reserved_pfn_range_from_nid() to enable the same operation for
reserved memory ranges. Example memory ranges that are reserved, but
still have associated numa-info are persistent memory or Soft Reserved
(EFI_MEMORY_SP) memory.
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: Jia He <justin.he@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
include/linux/memblock.h | 4 +++
include/linux/mm.h | 2 +
include/linux/numa.h | 2 +
mm/memblock.c | 22 ++++++++++++++--
mm/page_alloc.c | 63 +++++++++++++++++++++++++++++++++++++++++++++-
5 files changed, 87 insertions(+), 6 deletions(-)
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 017fae833d4a..0655e8376c72 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -234,6 +234,10 @@ void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \
i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
+#define for_each_reserved_pfn_range(i, nid, p_start, p_end, p_nid) \
+ for (i = -1, __next_reserved_pfn_range(&i, nid, p_start, p_end, p_nid); \
+ i >= 0; __next_reserved_pfn_range(&i, nid, p_start, p_end, p_nid))
+
#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
void __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone,
unsigned long *out_spfn,
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 1e76ee5da20b..82dac9f42c46 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2438,6 +2438,8 @@ extern unsigned long absent_pages_in_range(unsigned long start_pfn,
extern void get_pfn_range_for_nid(unsigned int nid,
unsigned long *start_pfn, unsigned long *end_pfn);
+extern void get_reserved_pfn_range_for_nid(unsigned int nid,
+ unsigned long *start_pfn, unsigned long *end_pfn);
extern unsigned long find_min_pfn_with_active_regions(void);
extern void sparse_memory_present_with_active_regions(int nid);
diff --git a/include/linux/numa.h b/include/linux/numa.h
index 5d25c5de1322..52b2430bc759 100644
--- a/include/linux/numa.h
+++ b/include/linux/numa.h
@@ -19,7 +19,7 @@ int numa_map_to_online_node(int node);
/*
* Optional architecture specific implementation, users need a "depends
- * on $ARCH"
+ * on $ARCH" or depends on CONFIG_MEMBLOCK_NUMA_INFO
*/
int phys_to_target_node(phys_addr_t addr);
#else
diff --git a/mm/memblock.c b/mm/memblock.c
index 39aceafc57f6..43c3abab705e 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1200,11 +1200,11 @@ void __init_memblock __next_mem_range_rev(u64 *idx, int nid,
/*
* Common iterator interface used to define for_each_mem_pfn_range().
*/
-void __init_memblock __next_mem_pfn_range(int *idx, int nid,
+static void __init_memblock __next_memblock_pfn_range(int *idx, int nid,
unsigned long *out_start_pfn,
- unsigned long *out_end_pfn, int *out_nid)
+ unsigned long *out_end_pfn, int *out_nid,
+ struct memblock_type *type)
{
- struct memblock_type *type = &memblock.memory;
struct memblock_region *r;
int r_nid;
@@ -1230,6 +1230,22 @@ void __init_memblock __next_mem_pfn_range(int *idx, int nid,
*out_nid = r_nid;
}
+void __init_memblock __next_mem_pfn_range(int *idx, int nid,
+ unsigned long *out_start_pfn,
+ unsigned long *out_end_pfn, int *out_nid)
+{
+ __next_memblock_pfn_range(idx, nid, out_start_pfn, out_end_pfn, out_nid,
+ &memblock.memory);
+}
+
+void __init_memblock __next_reserved_pfn_range(int *idx, int nid,
+ unsigned long *out_start_pfn,
+ unsigned long *out_end_pfn, int *out_nid)
+{
+ __next_memblock_pfn_range(idx, nid, out_start_pfn, out_end_pfn, out_nid,
+ &memblock.reserved);
+}
+
/**
* memblock_set_node - set node ID on memblock regions
* @base: base of area to set node ID for
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index df8bd169dbb4..94ad77c0c338 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6369,12 +6369,39 @@ void __init_or_memblock get_pfn_range_for_nid(unsigned int nid,
*start_pfn = 0;
}
+/**
+ * get_reserved_pfn_range_for_nid - Return the start and end page frames for a node
+ * @nid: The nid to return the range for. If MAX_NUMNODES, the min and max PFN are returned.
+ * @start_pfn: Passed by reference. On return, it will have the node start_pfn.
+ * @end_pfn: Passed by reference. On return, it will have the node end_pfn.
+ *
+ * Mostly identical to get_pfn_range_for_nid() except it operates on
+ * reserved ranges rather than online memory.
+ */
+void __init_or_memblock get_reserved_pfn_range_for_nid(unsigned int nid,
+ unsigned long *start_pfn, unsigned long *end_pfn)
+{
+ unsigned long this_start_pfn, this_end_pfn;
+ int i;
+
+ *start_pfn = -1UL;
+ *end_pfn = 0;
+
+ for_each_mem_pfn_range(i, nid, &this_start_pfn, &this_end_pfn, NULL) {
+ *start_pfn = min(*start_pfn, this_start_pfn);
+ *end_pfn = max(*end_pfn, this_end_pfn);
+ }
+
+ if (*start_pfn == -1UL)
+ *start_pfn = 0;
+}
+
/*
* Generic implementation of memory_add_physaddr_to_nid() depends on
* architecture using memblock data for numa information.
*/
#ifdef CONFIG_MEMBLOCK_NUMA_INFO
-int __init_or_memblock memory_add_physaddr_to_nid(u64 addr)
+static int __init_or_memblock __memory_add_physaddr_to_nid(u64 addr)
{
unsigned long start_pfn, end_pfn, pfn = PHYS_PFN(addr);
int nid;
@@ -6384,10 +6411,42 @@ int __init_or_memblock memory_add_physaddr_to_nid(u64 addr)
if (pfn >= start_pfn && pfn <= end_pfn)
return nid;
}
+ return NUMA_NO_NODE;
+}
+
+int __init_or_memblock memory_add_physaddr_to_nid(u64 addr)
+{
+ int nid = __memory_add_physaddr_to_nid(addr);
+
/* Default to node0 as not all callers are prepared for this to fail */
- return 0;
+ if (nid == NUMA_NO_NODE)
+ return 0;
+ return nid;
}
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
+
+int __init_or_memblock phys_to_target_node(u64 addr)
+{
+ unsigned long start_pfn, end_pfn, pfn = PHYS_PFN(addr);
+ int nid = __memory_add_physaddr_to_nid(addr);
+
+ if (nid != NUMA_NO_NODE)
+ return nid;
+
+ /*
+ * Search reserved memory ranges since the memory address does
+ * not appear to be online
+ */
+ for_each_possible_node(nid) {
+ if (node_online(nid))
+ continue;
+ get_reserved_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
+ if (pfn >= start_pfn && pfn <= end_pfn)
+ return nid;
+ }
+ return NUMA_NO_NODE;
+}
+EXPORT_SYMBOL_GPL(phys_to_target_node);
#endif /* CONFIG_MEMBLOCK_NUMA_INFO */
/*