[PATCH] sparsemem hotplug base
Make sparse's initalization be accessible at runtime. This allows sparse
mappings to be created after boot in a hotplug situation.
This patch is separated from the previous one just to give an indication how
much of the sparse infrastructure is *just* for hotplug memory.
The section_mem_map doesn't really store a pointer. It stores something that
is convenient to do some math against to get a pointer. It isn't valid to
just do *section_mem_map, so I don't think it should be stored as a pointer.
There are a couple of things I'd like to store about a section. First of all,
the fact that it is !NULL does not mean that it is present. There could be
such a combination where section_mem_map *is* NULL, but the math gets you
properly to a real mem_map. So, I don't think that check is safe.
Since we're storing 32-bit-aligned structures, we have a few bits in the
bottom of the pointer to play with. Use one bit to encode whether there's
really a mem_map there, and the other one to tell whether there's a valid
section there. We need to distinguish between the two because sometimes
there's a gap between when a section is discovered to be present and when we
can get the mem_map for it.
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Bob Picco <bob.picco@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/mm/sparse.c b/mm/sparse.c
index f888385..b54e304 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -25,7 +25,7 @@
for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {
unsigned long section = pfn_to_section_nr(pfn);
if (!mem_section[section].section_mem_map)
- mem_section[section].section_mem_map = (void *) -1;
+ mem_section[section].section_mem_map = SECTION_MARKED_PRESENT;
}
}
@@ -51,6 +51,56 @@
}
/*
+ * Subtle, we encode the real pfn into the mem_map such that
+ * the identity pfn - section_mem_map will return the actual
+ * physical page frame number.
+ */
+static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long pnum)
+{
+ return (unsigned long)(mem_map - (section_nr_to_pfn(pnum)));
+}
+
+/*
+ * We need this if we ever free the mem_maps. While not implemented yet,
+ * this function is included for parity with its sibling.
+ */
+static __attribute((unused))
+struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pnum)
+{
+ return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum);
+}
+
+static int sparse_init_one_section(struct mem_section *ms,
+ unsigned long pnum, struct page *mem_map)
+{
+ if (!valid_section(ms))
+ return -EINVAL;
+
+ ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum);
+
+ return 1;
+}
+
+static struct page *sparse_early_mem_map_alloc(unsigned long pnum)
+{
+ struct page *map;
+ int nid = early_pfn_to_nid(section_nr_to_pfn(pnum));
+
+ map = alloc_remap(nid, sizeof(struct page) * PAGES_PER_SECTION);
+ if (map)
+ return map;
+
+ map = alloc_bootmem_node(NODE_DATA(nid),
+ sizeof(struct page) * PAGES_PER_SECTION);
+ if (map)
+ return map;
+
+ printk(KERN_WARNING "%s: allocation failed\n", __FUNCTION__);
+ mem_section[pnum].section_mem_map = 0;
+ return NULL;
+}
+
+/*
* Allocate the accumulated non-linear sections, allocate a mem_map
* for each and record the physical to section mapping.
*/
@@ -58,28 +108,30 @@
{
unsigned long pnum;
struct page *map;
- int nid;
for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) {
- if (!mem_section[pnum].section_mem_map)
+ if (!valid_section_nr(pnum))
continue;
- nid = early_pfn_to_nid(section_nr_to_pfn(pnum));
- map = alloc_remap(nid, sizeof(struct page) * PAGES_PER_SECTION);
- if (!map)
- map = alloc_bootmem_node(NODE_DATA(nid),
- sizeof(struct page) * PAGES_PER_SECTION);
- if (!map) {
- mem_section[pnum].section_mem_map = 0;
- continue;
- }
-
- /*
- * Subtle, we encode the real pfn into the mem_map such that
- * the identity pfn - section_mem_map will return the actual
- * physical page frame number.
- */
- mem_section[pnum].section_mem_map = map -
- section_nr_to_pfn(pnum);
+ map = sparse_early_mem_map_alloc(pnum);
+ if (map)
+ sparse_init_one_section(&mem_section[pnum], pnum, map);
}
}
+
+/*
+ * returns the number of sections whose mem_maps were properly
+ * set. If this is <=0, then that means that the passed-in
+ * map was not consumed and must be freed.
+ */
+int sparse_add_one_section(unsigned long start_pfn, int nr_pages, struct page *map)
+{
+ struct mem_section *ms = __pfn_to_section(start_pfn);
+
+ if (ms->section_mem_map & SECTION_MARKED_PRESENT)
+ return -EEXIST;
+
+ ms->section_mem_map |= SECTION_MARKED_PRESENT;
+
+ return sparse_init_one_section(ms, pfn_to_section_nr(start_pfn), map);
+}