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-rw-r--r--mm/memory_hotplug.c67
1 files changed, 48 insertions, 19 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 92f95952692b..4af58a3a8ffa 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -17,6 +17,7 @@
#include <linux/sysctl.h>
#include <linux/cpu.h>
#include <linux/memory.h>
+#include <linux/memremap.h>
#include <linux/memory_hotplug.h>
#include <linux/highmem.h>
#include <linux/vmalloc.h>
@@ -506,10 +507,25 @@ int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn,
unsigned long i;
int err = 0;
int start_sec, end_sec;
+ struct vmem_altmap *altmap;
+
/* during initialize mem_map, align hot-added range to section */
start_sec = pfn_to_section_nr(phys_start_pfn);
end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1);
+ altmap = to_vmem_altmap((unsigned long) pfn_to_page(phys_start_pfn));
+ if (altmap) {
+ /*
+ * Validate altmap is within bounds of the total request
+ */
+ if (altmap->base_pfn != phys_start_pfn
+ || vmem_altmap_offset(altmap) > nr_pages) {
+ pr_warn_once("memory add fail, invalid altmap\n");
+ return -EINVAL;
+ }
+ altmap->alloc = 0;
+ }
+
for (i = start_sec; i <= end_sec; i++) {
err = __add_section(nid, zone, section_nr_to_pfn(i));
@@ -731,7 +747,8 @@ static void __remove_zone(struct zone *zone, unsigned long start_pfn)
pgdat_resize_unlock(zone->zone_pgdat, &flags);
}
-static int __remove_section(struct zone *zone, struct mem_section *ms)
+static int __remove_section(struct zone *zone, struct mem_section *ms,
+ unsigned long map_offset)
{
unsigned long start_pfn;
int scn_nr;
@@ -748,7 +765,7 @@ static int __remove_section(struct zone *zone, struct mem_section *ms)
start_pfn = section_nr_to_pfn(scn_nr);
__remove_zone(zone, start_pfn);
- sparse_remove_one_section(zone, ms);
+ sparse_remove_one_section(zone, ms, map_offset);
return 0;
}
@@ -767,9 +784,32 @@ int __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
unsigned long nr_pages)
{
unsigned long i;
- int sections_to_remove;
- resource_size_t start, size;
- int ret = 0;
+ unsigned long map_offset = 0;
+ int sections_to_remove, ret = 0;
+
+ /* In the ZONE_DEVICE case device driver owns the memory region */
+ if (is_dev_zone(zone)) {
+ struct page *page = pfn_to_page(phys_start_pfn);
+ struct vmem_altmap *altmap;
+
+ altmap = to_vmem_altmap((unsigned long) page);
+ if (altmap)
+ map_offset = vmem_altmap_offset(altmap);
+ } else {
+ resource_size_t start, size;
+
+ start = phys_start_pfn << PAGE_SHIFT;
+ size = nr_pages * PAGE_SIZE;
+
+ ret = release_mem_region_adjustable(&iomem_resource, start,
+ size);
+ if (ret) {
+ resource_size_t endres = start + size - 1;
+
+ pr_warn("Unable to release resource <%pa-%pa> (%d)\n",
+ &start, &endres, ret);
+ }
+ }
/*
* We can only remove entire sections
@@ -777,23 +817,12 @@ int __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK);
BUG_ON(nr_pages % PAGES_PER_SECTION);
- start = phys_start_pfn << PAGE_SHIFT;
- size = nr_pages * PAGE_SIZE;
-
- /* in the ZONE_DEVICE case device driver owns the memory region */
- if (!is_dev_zone(zone))
- ret = release_mem_region_adjustable(&iomem_resource, start, size);
- if (ret) {
- resource_size_t endres = start + size - 1;
-
- pr_warn("Unable to release resource <%pa-%pa> (%d)\n",
- &start, &endres, ret);
- }
-
sections_to_remove = nr_pages / PAGES_PER_SECTION;
for (i = 0; i < sections_to_remove; i++) {
unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION;
- ret = __remove_section(zone, __pfn_to_section(pfn));
+
+ ret = __remove_section(zone, __pfn_to_section(pfn), map_offset);
+ map_offset = 0;
if (ret)
break;
}