[PATCH v3 17/26] mm: introduce numa_memblks

Mike Rapoport
2024-08-01T06:18:45Z

From: "Mike Rapoport (Microsoft)" <rppt@kernel.org>

Move code dealing with numa_memblks from arch/x86 to mm/ and add Kconfig
options to let x86 select it in its Kconfig.

This code will be later reused by arch_numa.

No functional changes.

Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Tested-by: Zi Yan <ziy@nvidia.com> # for x86_64 and arm64
---
arch/x86/Kconfig | 1 +
arch/x86/include/asm/numa.h | 3 -
arch/x86/mm/amdtopology.c | 1 +
arch/x86/mm/numa.c | 372 +--------------------------------
arch/x86/mm/numa_emulation.c | 1 +
arch/x86/mm/numa_internal.h | 15 +-
drivers/acpi/numa/srat.c | 1 +
drivers/of/of_numa.c | 1 +
include/linux/numa_memblks.h | 35 ++++
mm/Kconfig | 3 +
mm/Makefile | 1 +
mm/numa_memblks.c | 385 +++++++++++++++++++++++++++++++++++
12 files changed, 436 insertions(+), 383 deletions(-)
create mode 100644 include/linux/numa_memblks.h
create mode 100644 mm/numa_memblks.c

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 007bab9f2a0e..74afb59c6603 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -296,6 +296,7 @@ config X86
select NEED_PER_CPU_EMBED_FIRST_CHUNK
select NEED_PER_CPU_PAGE_FIRST_CHUNK
select NEED_SG_DMA_LENGTH
+ select NUMA_MEMBLKS if NUMA
select PCI_DOMAINS if PCI
select PCI_LOCKLESS_CONFIG if PCI
select PERF_EVENTS
diff --git a/arch/x86/include/asm/numa.h b/arch/x86/include/asm/numa.h
index 6fa5ea925aac..6e9a50bf03d4 100644
--- a/arch/x86/include/asm/numa.h
+++ b/arch/x86/include/asm/numa.h
@@ -10,8 +10,6 @@

#ifdef CONFIG_NUMA

-#define NR_NODE_MEMBLKS (MAX_NUMNODES*2)
-
extern int numa_off;

/*
@@ -25,7 +23,6 @@ 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 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/mm/amdtopology.c b/arch/x86/mm/amdtopology.c
index 9332b36a1091..628833afee37 100644
--- a/arch/x86/mm/amdtopology.c
+++ b/arch/x86/mm/amdtopology.c
@@ -12,6 +12,7 @@
#include <linux/string.h>
#include <linux/nodemask.h>
#include <linux/memblock.h>
+#include <linux/numa_memblks.h>

#include <asm/io.h>
#include <linux/pci_ids.h>
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index cf7b95125d2a..6874d5650b4d 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -13,6 +13,7 @@
#include <linux/sched.h>
#include <linux/topology.h>
#include <linux/sort.h>
+#include <linux/numa_memblks.h>

#include <asm/e820/api.h>
#include <asm/proto.h>
@@ -22,10 +23,6 @@
#include "numa_internal.h"

int numa_off;
-nodemask_t numa_nodes_parsed __initdata;
-
-static struct numa_meminfo numa_meminfo __initdata_or_meminfo;
-static struct numa_meminfo numa_reserved_meminfo __initdata_or_meminfo;

static int numa_distance_cnt;
static u8 *numa_distance;
@@ -121,194 +118,6 @@ void __init setup_node_to_cpumask_map(void)
pr_debug("Node to cpumask map for %u nodes\n", nr_node_ids);
}

-static int __init numa_add_memblk_to(int nid, u64 start, u64 end,
- struct numa_meminfo *mi)
-{
- /* ignore zero length blks */
- if (start == end)
- return 0;
-
- /* whine about and ignore invalid blks */
- if (start > end || nid < 0 || nid >= MAX_NUMNODES) {
- pr_warn("Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
- nid, start, end - 1);
- return 0;
- }
-
- if (mi->nr_blks >= NR_NODE_MEMBLKS) {
- pr_err("too many memblk ranges\n");
- return -EINVAL;
- }
-
- mi->blk[mi->nr_blks].start = start;
- mi->blk[mi->nr_blks].end = end;
- mi->blk[mi->nr_blks].nid = nid;
- mi->nr_blks++;
- return 0;
-}
-
-/**
- * numa_remove_memblk_from - Remove one numa_memblk from a numa_meminfo
- * @idx: Index of memblk to remove
- * @mi: numa_meminfo to remove memblk from
- *
- * Remove @idx'th numa_memblk from @mi by shifting @mi->blk[] and
- * decrementing @mi->nr_blks.
- */
-void __init numa_remove_memblk_from(int idx, struct numa_meminfo *mi)
-{
- mi->nr_blks--;
- memmove(&mi->blk[idx], &mi->blk[idx + 1],
- (mi->nr_blks - idx) * sizeof(mi->blk[0]));
-}
-
-/**
- * numa_move_tail_memblk - Move a numa_memblk from one numa_meminfo to another
- * @dst: numa_meminfo to append block to
- * @idx: Index of memblk to remove
- * @src: numa_meminfo to remove memblk from
- */
-static void __init numa_move_tail_memblk(struct numa_meminfo *dst, int idx,
- struct numa_meminfo *src)
-{
- dst->blk[dst->nr_blks++] = src->blk[idx];
- numa_remove_memblk_from(idx, src);
-}
-
-/**
- * numa_add_memblk - Add one numa_memblk to numa_meminfo
- * @nid: NUMA node ID of the new memblk
- * @start: Start address of the new memblk
- * @end: End address of the new memblk
- *
- * 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)
-{
- return numa_add_memblk_to(nid, start, end, &numa_meminfo);
-}
-
-/**
- * numa_cleanup_meminfo - Cleanup a numa_meminfo
- * @mi: numa_meminfo to clean up
- *
- * Sanitize @mi by merging and removing unnecessary memblks. Also check for
- * conflicts and clear unused memblks.
- *
- * RETURNS:
- * 0 on success, -errno on failure.
- */
-int __init numa_cleanup_meminfo(struct numa_meminfo *mi)
-{
- const u64 low = 0;
- const u64 high = PFN_PHYS(max_pfn);
- int i, j, k;
-
- /* first, trim all entries */
- for (i = 0; i < mi->nr_blks; i++) {
- struct numa_memblk *bi = &mi->blk[i];
-
- /* move / save reserved memory ranges */
- if (!memblock_overlaps_region(&memblock.memory,
- bi->start, bi->end - bi->start)) {
- numa_move_tail_memblk(&numa_reserved_meminfo, i--, mi);
- continue;
- }
-
- /* make sure all non-reserved blocks are inside the limits */
- bi->start = max(bi->start, low);
-
- /* preserve info for non-RAM areas above 'max_pfn': */
- if (bi->end > high) {
- numa_add_memblk_to(bi->nid, high, bi->end,
- &numa_reserved_meminfo);
- bi->end = high;
- }
-
- /* and there's no empty block */
- if (bi->start >= bi->end)
- numa_remove_memblk_from(i--, mi);
- }
-
- /* merge neighboring / overlapping entries */
- for (i = 0; i < mi->nr_blks; i++) {
- struct numa_memblk *bi = &mi->blk[i];
-
- for (j = i + 1; j < mi->nr_blks; j++) {
- struct numa_memblk *bj = &mi->blk[j];
- u64 start, end;
-
- /*
- * See whether there are overlapping blocks. Whine
- * about but allow overlaps of the same nid. They
- * will be merged below.
- */
- if (bi->end > bj->start && bi->start < bj->end) {
- if (bi->nid != bj->nid) {
- pr_err("node %d [mem %#010Lx-%#010Lx] overlaps with node %d [mem %#010Lx-%#010Lx]\n",
- bi->nid, bi->start, bi->end - 1,
- bj->nid, bj->start, bj->end - 1);
- return -EINVAL;
- }
- pr_warn("Warning: node %d [mem %#010Lx-%#010Lx] overlaps with itself [mem %#010Lx-%#010Lx]\n",
- bi->nid, bi->start, bi->end - 1,
- bj->start, bj->end - 1);
- }
-
- /*
- * Join together blocks on the same node, holes
- * between which don't overlap with memory on other
- * nodes.
- */
- if (bi->nid != bj->nid)
- continue;
- start = min(bi->start, bj->start);
- end = max(bi->end, bj->end);
- for (k = 0; k < mi->nr_blks; k++) {
- struct numa_memblk *bk = &mi->blk[k];
-
- if (bi->nid == bk->nid)
- continue;
- if (start < bk->end && end > bk->start)
- break;
- }
- if (k < mi->nr_blks)
- continue;
- printk(KERN_INFO "NUMA: Node %d [mem %#010Lx-%#010Lx] + [mem %#010Lx-%#010Lx] -> [mem %#010Lx-%#010Lx]\n",
- bi->nid, bi->start, bi->end - 1, bj->start,
- bj->end - 1, start, end - 1);
- bi->start = start;
- bi->end = end;
- numa_remove_memblk_from(j--, mi);
- }
- }
-
- /* clear unused ones */
- for (i = mi->nr_blks; i < ARRAY_SIZE(mi->blk); i++) {
- mi->blk[i].start = mi->blk[i].end = 0;
- mi->blk[i].nid = NUMA_NO_NODE;
- }
-
- return 0;
-}
-
-/*
- * Set nodes, which have memory in @mi, in *@nodemask.
- */
-static void __init numa_nodemask_from_meminfo(nodemask_t *nodemask,
- const struct numa_meminfo *mi)
-{
- int i;
-
- for (i = 0; i < ARRAY_SIZE(mi->blk); i++)
- if (mi->blk[i].start != mi->blk[i].end &&
- mi->blk[i].nid != NUMA_NO_NODE)
- node_set(mi->blk[i].nid, *nodemask);
-}
-
/**
* numa_reset_distance - Reset NUMA distance table
*
@@ -410,111 +219,13 @@ int __node_distance(int from, int to)
}
EXPORT_SYMBOL(__node_distance);

-/*
- * Mark all currently memblock-reserved physical memory (which covers the
- * kernel's own memory ranges) as hot-unswappable.
- */
-static void __init numa_clear_kernel_node_hotplug(void)
-{
- nodemask_t reserved_nodemask = NODE_MASK_NONE;
- struct memblock_region *mb_region;
- int i;
-
- /*
- * We have to do some preprocessing of memblock regions, to
- * make them suitable for reservation.
- *
- * At this time, all memory regions reserved by memblock are
- * used by the kernel, but those regions are not split up
- * along node boundaries yet, and don't necessarily have their
- * node ID set yet either.
- *
- * So iterate over all memory known to the x86 architecture,
- * and use those ranges to set the nid in memblock.reserved.
- * This will split up the memblock regions along node
- * boundaries and will set the node IDs as well.
- */
- for (i = 0; i < numa_meminfo.nr_blks; i++) {
- struct numa_memblk *mb = numa_meminfo.blk + i;
- int ret;
-
- ret = memblock_set_node(mb->start, mb->end - mb->start, &memblock.reserved, mb->nid);
- WARN_ON_ONCE(ret);
- }
-
- /*
- * Now go over all reserved memblock regions, to construct a
- * node mask of all kernel reserved memory areas.
- *
- * [ Note, when booting with mem=nn[kMG] or in a kdump kernel,
- * numa_meminfo might not include all memblock.reserved
- * memory ranges, because quirks such as trim_snb_memory()
- * reserve specific pages for Sandy Bridge graphics. ]
- */
- for_each_reserved_mem_region(mb_region) {
- int nid = memblock_get_region_node(mb_region);
-
- if (nid != NUMA_NO_NODE)
- node_set(nid, reserved_nodemask);
- }
-
- /*
- * Finally, clear the MEMBLOCK_HOTPLUG flag for all memory
- * belonging to the reserved node mask.
- *
- * Note that this will include memory regions that reside
- * on nodes that contain kernel memory - entire nodes
- * become hot-unpluggable:
- */
- for (i = 0; i < numa_meminfo.nr_blks; i++) {
- struct numa_memblk *mb = numa_meminfo.blk + i;
-
- if (!node_isset(mb->nid, reserved_nodemask))
- continue;
-
- memblock_clear_hotplug(mb->start, mb->end - mb->start);
- }
-}
-
static int __init numa_register_memblks(struct numa_meminfo *mi)
{
- int i, nid;
+ int nid, err;

- /* Account for nodes with cpus and no memory */
- node_possible_map = numa_nodes_parsed;
- numa_nodemask_from_meminfo(&node_possible_map, mi);
- if (WARN_ON(nodes_empty(node_possible_map)))
- return -EINVAL;
-
- for (i = 0; i < mi->nr_blks; i++) {
- struct numa_memblk *mb = &mi->blk[i];
- memblock_set_node(mb->start, mb->end - mb->start,
- &memblock.memory, mb->nid);
- }
-
- /*
- * At very early time, the kernel have to use some memory such as
- * loading the kernel image. We cannot prevent this anyway. So any
- * node the kernel resides in should be un-hotpluggable.
- *
- * And when we come here, alloc node data won't fail.
- */
- numa_clear_kernel_node_hotplug();
-
- /*
- * If sections array is gonna be used for pfn -> nid mapping, check
- * whether its granularity is fine enough.
- */
- if (IS_ENABLED(NODE_NOT_IN_PAGE_FLAGS)) {
- unsigned long pfn_align = node_map_pfn_alignment();
-
- if (pfn_align && pfn_align < PAGES_PER_SECTION) {
- pr_warn("Node alignment %LuMB < min %LuMB, rejecting NUMA config\n",
- PFN_PHYS(pfn_align) >> 20,
- PFN_PHYS(PAGES_PER_SECTION) >> 20);
- return -EINVAL;
- }
- }
+ err = numa_register_meminfo(mi);
+ if (err)
+ return err;

if (!memblock_validate_numa_coverage(SZ_1M))
return -EINVAL;
@@ -912,76 +623,3 @@ int memory_add_physaddr_to_nid(u64 start)
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);

#endif
-
-static int __init cmp_memblk(const void *a, const void *b)
-{
- const struct numa_memblk *ma = *(const struct numa_memblk **)a;
- const struct numa_memblk *mb = *(const struct numa_memblk **)b;
-
- return (ma->start > mb->start) - (ma->start < mb->start);
-}
-
-static struct numa_memblk *numa_memblk_list[NR_NODE_MEMBLKS] __initdata;
-
-/**
- * numa_fill_memblks - Fill gaps in numa_meminfo memblks
- * @start: address to begin fill
- * @end: address to end fill
- *
- * Find and extend numa_meminfo memblks to cover the physical
- * address range @start-@end
- *
- * RETURNS:
- * 0 : Success
- * NUMA_NO_MEMBLK : No memblks exist in address range @start-@end
- */
-
-int __init numa_fill_memblks(u64 start, u64 end)
-{
- struct numa_memblk **blk = &numa_memblk_list[0];
- struct numa_meminfo *mi = &numa_meminfo;
- int count = 0;
- u64 prev_end;
-
- /*
- * Create a list of pointers to numa_meminfo memblks that
- * overlap start, end. The list is used to make in-place
- * changes that fill out the numa_meminfo memblks.
- */
- for (int i = 0; i < mi->nr_blks; i++) {
- struct numa_memblk *bi = &mi->blk[i];
-
- if (memblock_addrs_overlap(start, end - start, bi->start,
- bi->end - bi->start)) {
- blk[count] = &mi->blk[i];
- count++;
- }
- }
- if (!count)
- return NUMA_NO_MEMBLK;
-
- /* Sort the list of pointers in memblk->start order */
- sort(&blk[0], count, sizeof(blk[0]), cmp_memblk, NULL);
-
- /* Make sure the first/last memblks include start/end */
- blk[0]->start = min(blk[0]->start, start);
- blk[count - 1]->end = max(blk[count - 1]->end, end);
-
- /*
- * Fill any gaps by tracking the previous memblks
- * end address and backfilling to it if needed.
- */
- prev_end = blk[0]->end;
- for (int i = 1; i < count; i++) {
- struct numa_memblk *curr = blk[i];
-
- if (prev_end >= curr->start) {
- if (prev_end < curr->end)
- prev_end = curr->end;
- } else {
- curr->start = prev_end;
- prev_end = curr->end;
- }
- }
- return 0;
-}
diff --git a/arch/x86/mm/numa_emulation.c b/arch/x86/mm/numa_emulation.c
index 235f8a4eb2fa..33610026b7a3 100644
--- a/arch/x86/mm/numa_emulation.c
+++ b/arch/x86/mm/numa_emulation.c
@@ -6,6 +6,7 @@
#include <linux/errno.h>
#include <linux/topology.h>
#include <linux/memblock.h>
+#include <linux/numa_memblks.h>
#include <asm/dma.h>

#include "numa_internal.h"
diff --git a/arch/x86/mm/numa_internal.h b/arch/x86/mm/numa_internal.h
index 86860f279662..a51229a2f5af 100644
--- a/arch/x86/mm/numa_internal.h
+++ b/arch/x86/mm/numa_internal.h
@@ -5,23 +5,12 @@
#include <linux/types.h>
#include <asm/numa.h>

-struct numa_memblk {
- u64 start;
- u64 end;
- int nid;
-};
-
-struct numa_meminfo {
- int nr_blks;
- struct numa_memblk blk[NR_NODE_MEMBLKS];
-};
-
-void __init numa_remove_memblk_from(int idx, struct numa_meminfo *mi);
-int __init numa_cleanup_meminfo(struct numa_meminfo *mi);
void __init numa_reset_distance(void);

void __init x86_numa_init(void);

+struct numa_meminfo;
+
#ifdef CONFIG_NUMA_EMU
void __init numa_emulation(struct numa_meminfo *numa_meminfo,
int numa_dist_cnt);
diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c
index 44f91f2c6c5d..bec0dcd1f9c3 100644
--- a/drivers/acpi/numa/srat.c
+++ b/drivers/acpi/numa/srat.c
@@ -17,6 +17,7 @@
#include <linux/numa.h>
#include <linux/nodemask.h>
#include <linux/topology.h>
+#include <linux/numa_memblks.h>

static nodemask_t nodes_found_map = NODE_MASK_NONE;

diff --git a/drivers/of/of_numa.c b/drivers/of/of_numa.c
index 5949829a1b00..838747e319a2 100644
--- a/drivers/of/of_numa.c
+++ b/drivers/of/of_numa.c
@@ -10,6 +10,7 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/nodemask.h>
+#include <linux/numa_memblks.h>

#include <asm/numa.h>

diff --git a/include/linux/numa_memblks.h b/include/linux/numa_memblks.h
new file mode 100644
index 000000000000..6981cf97d2c9
--- /dev/null
+++ b/include/linux/numa_memblks.h
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __NUMA_MEMBLKS_H
+#define __NUMA_MEMBLKS_H
+
+#ifdef CONFIG_NUMA_MEMBLKS
+#include <linux/types.h>
+
+#define NR_NODE_MEMBLKS (MAX_NUMNODES * 2)
+
+struct numa_memblk {
+ u64 start;
+ u64 end;
+ int nid;
+};
+
+struct numa_meminfo {
+ int nr_blks;
+ struct numa_memblk blk[NR_NODE_MEMBLKS];
+};
+
+extern struct numa_meminfo numa_meminfo __initdata_or_meminfo;
+extern struct numa_meminfo numa_reserved_meminfo __initdata_or_meminfo;
+
+int __init numa_add_memblk(int nodeid, u64 start, u64 end);
+void __init numa_remove_memblk_from(int idx, struct numa_meminfo *mi);
+
+int __init numa_cleanup_meminfo(struct numa_meminfo *mi);
+int __init numa_register_meminfo(struct numa_meminfo *mi);
+
+void __init numa_nodemask_from_meminfo(nodemask_t *nodemask,
+ const struct numa_meminfo *mi);
+
+#endif /* CONFIG_NUMA_MEMBLKS */
+
+#endif /* __NUMA_MEMBLKS_H */
diff --git a/mm/Kconfig b/mm/Kconfig
index b72e7d040f78..dc5912d29ed5 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -1263,6 +1263,9 @@ config IOMMU_MM_DATA
config EXECMEM
bool

+config NUMA_MEMBLKS
+ bool
+
source "mm/damon/Kconfig"

endmenu
diff --git a/mm/Makefile b/mm/Makefile
index 4e668be85f0b..e3fac7efd880 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -142,3 +142,4 @@ obj-$(CONFIG_GENERIC_IOREMAP) += ioremap.o
obj-$(CONFIG_SHRINKER_DEBUG) += shrinker_debug.o
obj-$(CONFIG_EXECMEM) += execmem.o
obj-$(CONFIG_NUMA) += numa.o
+obj-$(CONFIG_NUMA_MEMBLKS) += numa_memblks.o
diff --git a/mm/numa_memblks.c b/mm/numa_memblks.c
new file mode 100644
index 000000000000..72f191a94c66
--- /dev/null
+++ b/mm/numa_memblks.c
@@ -0,0 +1,385 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/array_size.h>
+#include <linux/sort.h>
+#include <linux/printk.h>
+#include <linux/memblock.h>
+#include <linux/numa.h>
+#include <linux/numa_memblks.h>
+
+nodemask_t numa_nodes_parsed __initdata;
+
+struct numa_meminfo numa_meminfo __initdata_or_meminfo;
+struct numa_meminfo numa_reserved_meminfo __initdata_or_meminfo;
+
+static int __init numa_add_memblk_to(int nid, u64 start, u64 end,
+ struct numa_meminfo *mi)
+{
+ /* ignore zero length blks */
+ if (start == end)
+ return 0;
+
+ /* whine about and ignore invalid blks */
+ if (start > end || nid < 0 || nid >= MAX_NUMNODES) {
+ pr_warn("Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
+ nid, start, end - 1);
+ return 0;
+ }
+
+ if (mi->nr_blks >= NR_NODE_MEMBLKS) {
+ pr_err("too many memblk ranges\n");
+ return -EINVAL;
+ }
+
+ mi->blk[mi->nr_blks].start = start;
+ mi->blk[mi->nr_blks].end = end;
+ mi->blk[mi->nr_blks].nid = nid;
+ mi->nr_blks++;
+ return 0;
+}
+
+/**
+ * numa_remove_memblk_from - Remove one numa_memblk from a numa_meminfo
+ * @idx: Index of memblk to remove
+ * @mi: numa_meminfo to remove memblk from
+ *
+ * Remove @idx'th numa_memblk from @mi by shifting @mi->blk[] and
+ * decrementing @mi->nr_blks.
+ */
+void __init numa_remove_memblk_from(int idx, struct numa_meminfo *mi)
+{
+ mi->nr_blks--;
+ memmove(&mi->blk[idx], &mi->blk[idx + 1],
+ (mi->nr_blks - idx) * sizeof(mi->blk[0]));
+}
+
+/**
+ * numa_move_tail_memblk - Move a numa_memblk from one numa_meminfo to another
+ * @dst: numa_meminfo to append block to
+ * @idx: Index of memblk to remove
+ * @src: numa_meminfo to remove memblk from
+ */
+static void __init numa_move_tail_memblk(struct numa_meminfo *dst, int idx,
+ struct numa_meminfo *src)
+{
+ dst->blk[dst->nr_blks++] = src->blk[idx];
+ numa_remove_memblk_from(idx, src);
+}
+
+/**
+ * numa_add_memblk - Add one numa_memblk to numa_meminfo
+ * @nid: NUMA node ID of the new memblk
+ * @start: Start address of the new memblk
+ * @end: End address of the new memblk
+ *
+ * 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)
+{
+ return numa_add_memblk_to(nid, start, end, &numa_meminfo);
+}
+
+/**
+ * numa_cleanup_meminfo - Cleanup a numa_meminfo
+ * @mi: numa_meminfo to clean up
+ *
+ * Sanitize @mi by merging and removing unnecessary memblks. Also check for
+ * conflicts and clear unused memblks.
+ *
+ * RETURNS:
+ * 0 on success, -errno on failure.
+ */
+int __init numa_cleanup_meminfo(struct numa_meminfo *mi)
+{
+ const u64 low = 0;
+ const u64 high = PFN_PHYS(max_pfn);
+ int i, j, k;
+
+ /* first, trim all entries */
+ for (i = 0; i < mi->nr_blks; i++) {
+ struct numa_memblk *bi = &mi->blk[i];
+
+ /* move / save reserved memory ranges */
+ if (!memblock_overlaps_region(&memblock.memory,
+ bi->start, bi->end - bi->start)) {
+ numa_move_tail_memblk(&numa_reserved_meminfo, i--, mi);
+ continue;
+ }
+
+ /* make sure all non-reserved blocks are inside the limits */
+ bi->start = max(bi->start, low);
+
+ /* preserve info for non-RAM areas above 'max_pfn': */
+ if (bi->end > high) {
+ numa_add_memblk_to(bi->nid, high, bi->end,
+ &numa_reserved_meminfo);
+ bi->end = high;
+ }
+
+ /* and there's no empty block */
+ if (bi->start >= bi->end)
+ numa_remove_memblk_from(i--, mi);
+ }
+
+ /* merge neighboring / overlapping entries */
+ for (i = 0; i < mi->nr_blks; i++) {
+ struct numa_memblk *bi = &mi->blk[i];
+
+ for (j = i + 1; j < mi->nr_blks; j++) {
+ struct numa_memblk *bj = &mi->blk[j];
+ u64 start, end;
+
+ /*
+ * See whether there are overlapping blocks. Whine
+ * about but allow overlaps of the same nid. They
+ * will be merged below.
+ */
+ if (bi->end > bj->start && bi->start < bj->end) {
+ if (bi->nid != bj->nid) {
+ pr_err("node %d [mem %#010Lx-%#010Lx] overlaps with node %d [mem %#010Lx-%#010Lx]\n",
+ bi->nid, bi->start, bi->end - 1,
+ bj->nid, bj->start, bj->end - 1);
+ return -EINVAL;
+ }
+ pr_warn("Warning: node %d [mem %#010Lx-%#010Lx] overlaps with itself [mem %#010Lx-%#010Lx]\n",
+ bi->nid, bi->start, bi->end - 1,
+ bj->start, bj->end - 1);
+ }
+
+ /*
+ * Join together blocks on the same node, holes
+ * between which don't overlap with memory on other
+ * nodes.
+ */
+ if (bi->nid != bj->nid)
+ continue;
+ start = min(bi->start, bj->start);
+ end = max(bi->end, bj->end);
+ for (k = 0; k < mi->nr_blks; k++) {
+ struct numa_memblk *bk = &mi->blk[k];
+
+ if (bi->nid == bk->nid)
+ continue;
+ if (start < bk->end && end > bk->start)
+ break;
+ }
+ if (k < mi->nr_blks)
+ continue;
+ pr_info("NUMA: Node %d [mem %#010Lx-%#010Lx] + [mem %#010Lx-%#010Lx] -> [mem %#010Lx-%#010Lx]\n",
+ bi->nid, bi->start, bi->end - 1, bj->start,
+ bj->end - 1, start, end - 1);
+ bi->start = start;
+ bi->end = end;
+ numa_remove_memblk_from(j--, mi);
+ }
+ }
+
+ /* clear unused ones */
+ for (i = mi->nr_blks; i < ARRAY_SIZE(mi->blk); i++) {
+ mi->blk[i].start = mi->blk[i].end = 0;
+ mi->blk[i].nid = NUMA_NO_NODE;
+ }
+
+ return 0;
+}
+
+/*
+ * Set nodes, which have memory in @mi, in *@nodemask.
+ */
+void __init numa_nodemask_from_meminfo(nodemask_t *nodemask,
+ const struct numa_meminfo *mi)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(mi->blk); i++)
+ if (mi->blk[i].start != mi->blk[i].end &&
+ mi->blk[i].nid != NUMA_NO_NODE)
+ node_set(mi->blk[i].nid, *nodemask);
+}
+
+/*
+ * Mark all currently memblock-reserved physical memory (which covers the
+ * kernel's own memory ranges) as hot-unswappable.
+ */
+static void __init numa_clear_kernel_node_hotplug(void)
+{
+ nodemask_t reserved_nodemask = NODE_MASK_NONE;
+ struct memblock_region *mb_region;
+ int i;
+
+ /*
+ * We have to do some preprocessing of memblock regions, to
+ * make them suitable for reservation.
+ *
+ * At this time, all memory regions reserved by memblock are
+ * used by the kernel, but those regions are not split up
+ * along node boundaries yet, and don't necessarily have their
+ * node ID set yet either.
+ *
+ * So iterate over all parsed memory blocks and use those ranges to
+ * set the nid in memblock.reserved. This will split up the
+ * memblock regions along node boundaries and will set the node IDs
+ * as well.
+ */
+ for (i = 0; i < numa_meminfo.nr_blks; i++) {
+ struct numa_memblk *mb = numa_meminfo.blk + i;
+ int ret;
+
+ ret = memblock_set_node(mb->start, mb->end - mb->start,
+ &memblock.reserved, mb->nid);
+ WARN_ON_ONCE(ret);
+ }
+
+ /*
+ * Now go over all reserved memblock regions, to construct a
+ * node mask of all kernel reserved memory areas.
+ *
+ * [ Note, when booting with mem=nn[kMG] or in a kdump kernel,
+ * numa_meminfo might not include all memblock.reserved
+ * memory ranges, because quirks such as trim_snb_memory()
+ * reserve specific pages for Sandy Bridge graphics. ]
+ */
+ for_each_reserved_mem_region(mb_region) {
+ int nid = memblock_get_region_node(mb_region);
+
+ if (nid != MAX_NUMNODES)
+ node_set(nid, reserved_nodemask);
+ }
+
+ /*
+ * Finally, clear the MEMBLOCK_HOTPLUG flag for all memory
+ * belonging to the reserved node mask.
+ *
+ * Note that this will include memory regions that reside
+ * on nodes that contain kernel memory - entire nodes
+ * become hot-unpluggable:
+ */
+ for (i = 0; i < numa_meminfo.nr_blks; i++) {
+ struct numa_memblk *mb = numa_meminfo.blk + i;
+
+ if (!node_isset(mb->nid, reserved_nodemask))
+ continue;
+
+ memblock_clear_hotplug(mb->start, mb->end - mb->start);
+ }
+}
+
+int __init numa_register_meminfo(struct numa_meminfo *mi)
+{
+ int i;
+
+ /* Account for nodes with cpus and no memory */
+ node_possible_map = numa_nodes_parsed;
+ numa_nodemask_from_meminfo(&node_possible_map, mi);
+ if (WARN_ON(nodes_empty(node_possible_map)))
+ return -EINVAL;
+
+ for (i = 0; i < mi->nr_blks; i++) {
+ struct numa_memblk *mb = &mi->blk[i];
+
+ memblock_set_node(mb->start, mb->end - mb->start,
+ &memblock.memory, mb->nid);
+ }
+
+ /*
+ * At very early time, the kernel have to use some memory such as
+ * loading the kernel image. We cannot prevent this anyway. So any
+ * node the kernel resides in should be un-hotpluggable.
+ *
+ * And when we come here, alloc node data won't fail.
+ */
+ numa_clear_kernel_node_hotplug();
+
+ /*
+ * If sections array is gonna be used for pfn -> nid mapping, check
+ * whether its granularity is fine enough.
+ */
+ if (IS_ENABLED(NODE_NOT_IN_PAGE_FLAGS)) {
+ unsigned long pfn_align = node_map_pfn_alignment();
+
+ if (pfn_align && pfn_align < PAGES_PER_SECTION) {
+ pr_warn("Node alignment %LuMB < min %LuMB, rejecting NUMA config\n",
+ PFN_PHYS(pfn_align) >> 20,
+ PFN_PHYS(PAGES_PER_SECTION) >> 20);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static int __init cmp_memblk(const void *a, const void *b)
+{
+ const struct numa_memblk *ma = *(const struct numa_memblk **)a;
+ const struct numa_memblk *mb = *(const struct numa_memblk **)b;
+
+ return (ma->start > mb->start) - (ma->start < mb->start);
+}
+
+static struct numa_memblk *numa_memblk_list[NR_NODE_MEMBLKS] __initdata;
+
+/**
+ * numa_fill_memblks - Fill gaps in numa_meminfo memblks
+ * @start: address to begin fill
+ * @end: address to end fill
+ *
+ * Find and extend numa_meminfo memblks to cover the physical
+ * address range @start-@end
+ *
+ * RETURNS:
+ * 0 : Success
+ * NUMA_NO_MEMBLK : No memblks exist in address range @start-@end
+ */
+
+int __init numa_fill_memblks(u64 start, u64 end)
+{
+ struct numa_memblk **blk = &numa_memblk_list[0];
+ struct numa_meminfo *mi = &numa_meminfo;
+ int count = 0;
+ u64 prev_end;
+
+ /*
+ * Create a list of pointers to numa_meminfo memblks that
+ * overlap start, end. The list is used to make in-place
+ * changes that fill out the numa_meminfo memblks.
+ */
+ for (int i = 0; i < mi->nr_blks; i++) {
+ struct numa_memblk *bi = &mi->blk[i];
+
+ if (memblock_addrs_overlap(start, end - start, bi->start,
+ bi->end - bi->start)) {
+ blk[count] = &mi->blk[i];
+ count++;
+ }
+ }
+ if (!count)
+ return NUMA_NO_MEMBLK;
+
+ /* Sort the list of pointers in memblk->start order */
+ sort(&blk[0], count, sizeof(blk[0]), cmp_memblk, NULL);
+
+ /* Make sure the first/last memblks include start/end */
+ blk[0]->start = min(blk[0]->start, start);
+ blk[count - 1]->end = max(blk[count - 1]->end, end);
+
+ /*
+ * Fill any gaps by tracking the previous memblks
+ * end address and backfilling to it if needed.
+ */
+ prev_end = blk[0]->end;
+ for (int i = 1; i < count; i++) {
+ struct numa_memblk *curr = blk[i];
+
+ if (prev_end >= curr->start) {
+ if (prev_end < curr->end)
+ prev_end = curr->end;
+ } else {
+ curr->start = prev_end;
+ prev_end = curr->end;
+ }
+ }
+ return 0;
+}
--
2.43.0