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mm: introduce numa_memblks

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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.

Link: https://lkml.kernel.org/r/20240807064110.1003856-18-rppt@kernel.org
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Tested-by: Zi Yan <ziy@nvidia.com> # for x86_64 and arm64
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Tested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> [arm64 + CXL via QEMU]
Acked-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: David S. Miller <davem@davemloft.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Rafael J. Wysocki <rafael@kernel.org>
Cc: Rob Herring (Arm) <robh@kernel.org>
Cc: Samuel Holland <samuel.holland@sifive.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Mike Rapoport (Microsoft) 2024-08-07 09:41:01 +03:00 committed by Andrew Morton
parent 7a7152857d
commit 8748270821
12 changed files with 436 additions and 383 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/Kconfig
View File

@ -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

3
arch/x86/include/asm/numa.h
View File

@ -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)

1
arch/x86/mm/amdtopology.c
View File

@ -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>

372
arch/x86/mm/numa.c
View File

@ -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;
@ -916,76 +627,3 @@ 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;
}

1
arch/x86/mm/numa_emulation.c
View File

@ -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"

15
arch/x86/mm/numa_internal.h
View File

@ -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);

1
drivers/acpi/numa/srat.c
View File

@ -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;

1
drivers/of/of_numa.c
View File

@ -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>

35
include/linux/numa_memblks.h Normal file
View File

@ -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 */

3
mm/Kconfig
View File

@ -1267,6 +1267,9 @@ config IOMMU_MM_DATA
config EXECMEM
bool
config NUMA_MEMBLKS
bool
source "mm/damon/Kconfig"
endmenu

1
mm/Makefile
View File

@ -118,6 +118,7 @@ obj-$(CONFIG_Z3FOLD) += z3fold.o
obj-$(CONFIG_GENERIC_EARLY_IOREMAP) += early_ioremap.o
obj-$(CONFIG_CMA) += cma.o
obj-$(CONFIG_NUMA) += numa.o
obj-$(CONFIG_NUMA_MEMBLKS) += numa_memblks.o
obj-$(CONFIG_MEMORY_BALLOON) += balloon_compaction.o
obj-$(CONFIG_PAGE_EXTENSION) += page_ext.o
obj-$(CONFIG_PAGE_TABLE_CHECK) += page_table_check.o

385
mm/numa_memblks.c Normal file
View File

@ -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;
}