bool movable_node_enabled = false;
#ifndef CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE
-int memhp_default_online_type = MMOP_OFFLINE;
+int mhp_default_online_type = MMOP_OFFLINE;
#else
-int memhp_default_online_type = MMOP_ONLINE;
+int mhp_default_online_type = MMOP_ONLINE;
#endif
static int __init setup_memhp_default_state(char *str)
{
- const int online_type = memhp_online_type_from_str(str);
+ const int online_type = mhp_online_type_from_str(str);
if (online_type >= 0)
- memhp_default_online_type = online_type;
+ mhp_default_online_type = online_type;
return 1;
}
struct page *pfn_to_online_page(unsigned long pfn)
{
unsigned long nr = pfn_to_section_nr(pfn);
+ struct dev_pagemap *pgmap;
struct mem_section *ms;
if (nr >= NR_MEM_SECTIONS)
if (!pfn_section_valid(ms, pfn))
return NULL;
+ if (!online_device_section(ms))
+ return pfn_to_page(pfn);
+
+ /*
+ * Slowpath: when ZONE_DEVICE collides with
+ * ZONE_{NORMAL,MOVABLE} within the same section some pfns in
+ * the section may be 'offline' but 'valid'. Only
+ * get_dev_pagemap() can determine sub-section online status.
+ */
+ pgmap = get_dev_pagemap(pfn, NULL);
+ put_dev_pagemap(pgmap);
+
+ /* The presence of a pgmap indicates ZONE_DEVICE offline pfn */
+ if (pgmap)
+ return NULL;
+
return pfn_to_page(pfn);
}
EXPORT_SYMBOL_GPL(pfn_to_online_page);
pgdat->node_spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - pgdat->node_start_pfn;
}
+
+static void section_taint_zone_device(unsigned long pfn)
+{
+ struct mem_section *ms = __pfn_to_section(pfn);
+
+ ms->section_mem_map |= SECTION_TAINT_ZONE_DEVICE;
+}
+
/*
* Associate the pfn range with the given zone, initializing the memmaps
* and resizing the pgdat/zone data to span the added pages. After this
resize_pgdat_range(pgdat, start_pfn, nr_pages);
pgdat_resize_unlock(pgdat, &flags);
+ /*
+ * Subsection population requires care in pfn_to_online_page().
+ * Set the taint to enable the slow path detection of
+ * ZONE_DEVICE pages in an otherwise ZONE_{NORMAL,MOVABLE}
+ * section.
+ */
+ if (zone_is_zone_device(zone)) {
+ if (!IS_ALIGNED(start_pfn, PAGES_PER_SECTION))
+ section_taint_zone_device(start_pfn);
+ if (!IS_ALIGNED(start_pfn + nr_pages, PAGES_PER_SECTION))
+ section_taint_zone_device(start_pfn + nr_pages);
+ }
+
/*
* TODO now we have a visible range of pages which are not associated
* with their zone properly. Not nice but set_pfnblock_flags_mask
static int online_memory_block(struct memory_block *mem, void *arg)
{
- mem->online_type = memhp_default_online_type;
+ mem->online_type = mhp_default_online_type;
return device_online(&mem->dev);
}
* In case we're allowed to merge the resource, flag it and trigger
* merging now that adding succeeded.
*/
- if (mhp_flags & MEMHP_MERGE_RESOURCE)
+ if (mhp_flags & MHP_MERGE_RESOURCE)
merge_system_ram_resource(res);
/* online pages if requested */
- if (memhp_default_online_type != MMOP_OFFLINE)
+ if (mhp_default_online_type != MMOP_OFFLINE)
walk_memory_blocks(start, size, NULL, online_memory_block);
return ret;