#define memblock_dbg(fmt, ...) \
if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
+phys_addr_t memblock_find_in_range_node(phys_addr_t start, phys_addr_t end,
+ phys_addr_t size, phys_addr_t align, int nid);
phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
phys_addr_t size, phys_addr_t align);
int memblock_free_reserved_regions(void);
i != (u64)ULLONG_MAX; \
__next_free_mem_range(&i, nid, p_start, p_end, p_nid))
+void __next_free_mem_range_rev(u64 *idx, int nid, phys_addr_t *out_start,
+ phys_addr_t *out_end, int *out_nid);
+
+/**
+ * for_each_free_mem_range_reverse - rev-iterate through free memblock areas
+ * @i: u64 used as loop variable
+ * @nid: node selector, %MAX_NUMNODES for all nodes
+ * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
+ * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
+ * @p_nid: ptr to int for nid of the range, can be %NULL
+ *
+ * Walks over free (memory && !reserved) areas of memblock in reverse
+ * order. Available as soon as memblock is initialized.
+ */
+#define for_each_free_mem_range_reverse(i, nid, p_start, p_end, p_nid) \
+ for (i = (u64)ULLONG_MAX, \
+ __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid); \
+ i != (u64)ULLONG_MAX; \
+ __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid))
+
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
int memblock_set_node(phys_addr_t base, phys_addr_t size, int nid);
}
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
-phys_addr_t memblock_find_in_range_node(phys_addr_t start, phys_addr_t end,
- phys_addr_t size, phys_addr_t align, int nid);
phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
return (i < type->cnt) ? i : -1;
}
-/*
- * Find, allocate, deallocate or reserve unreserved regions. All allocations
- * are top-down.
+/**
+ * memblock_find_in_range_node - find free area in given range and node
+ * @start: start of candidate range
+ * @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE}
+ * @size: size of free area to find
+ * @align: alignment of free area to find
+ * @nid: nid of the free area to find, %MAX_NUMNODES for any node
+ *
+ * Find @size free area aligned to @align in the specified range and node.
+ *
+ * RETURNS:
+ * Found address on success, %0 on failure.
*/
-
-static phys_addr_t __init_memblock memblock_find_region(phys_addr_t start, phys_addr_t end,
- phys_addr_t size, phys_addr_t align)
+phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
+ phys_addr_t end, phys_addr_t size,
+ phys_addr_t align, int nid)
{
- phys_addr_t base, res_base;
- long j;
+ phys_addr_t this_start, this_end, cand;
+ u64 i;
- /* In case, huge size is requested */
- if (end < size)
- return 0;
+ /* align @size to avoid excessive fragmentation on reserved array */
+ size = round_up(size, align);
+
+ /* pump up @end */
+ if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
+ end = memblock.current_limit;
- base = round_down(end - size, align);
+ /* adjust @start to avoid underflow and allocating the first page */
+ start = max3(start, size, (phys_addr_t)PAGE_SIZE);
+ end = max(start, end);
- /* Prevent allocations returning 0 as it's also used to
- * indicate an allocation failure
- */
- if (start == 0)
- start = PAGE_SIZE;
-
- while (start <= base) {
- j = memblock_overlaps_region(&memblock.reserved, base, size);
- if (j < 0)
- return base;
- res_base = memblock.reserved.regions[j].base;
- if (res_base < size)
- break;
- base = round_down(res_base - size, align);
- }
+ for_each_free_mem_range_reverse(i, nid, &this_start, &this_end, NULL) {
+ this_start = clamp(this_start, start, end);
+ this_end = clamp(this_end, start, end);
+ cand = round_down(this_end - size, align);
+ if (cand >= this_start)
+ return cand;
+ }
return 0;
}
-/*
- * Find a free area with specified alignment in a specific range.
+/**
+ * memblock_find_in_range - find free area in given range
+ * @start: start of candidate range
+ * @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE}
+ * @size: size of free area to find
+ * @align: alignment of free area to find
+ *
+ * Find @size free area aligned to @align in the specified range.
+ *
+ * RETURNS:
+ * Found address on success, %0 on failure.
*/
-phys_addr_t __init_memblock memblock_find_in_range(phys_addr_t start, phys_addr_t end,
- phys_addr_t size, phys_addr_t align)
+phys_addr_t __init_memblock memblock_find_in_range(phys_addr_t start,
+ phys_addr_t end, phys_addr_t size,
+ phys_addr_t align)
{
- long i;
-
- BUG_ON(0 == size);
-
- /* Pump up max_addr */
- if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
- end = memblock.current_limit;
-
- /* We do a top-down search, this tends to limit memory
- * fragmentation by keeping early boot allocs near the
- * top of memory
- */
- for (i = memblock.memory.cnt - 1; i >= 0; i--) {
- phys_addr_t memblockbase = memblock.memory.regions[i].base;
- phys_addr_t memblocksize = memblock.memory.regions[i].size;
- phys_addr_t bottom, top, found;
-
- if (memblocksize < size)
- continue;
- if ((memblockbase + memblocksize) <= start)
- break;
- bottom = max(memblockbase, start);
- top = min(memblockbase + memblocksize, end);
- if (bottom >= top)
- continue;
- found = memblock_find_region(bottom, top, size, align);
- if (found)
- return found;
- }
- return 0;
+ return memblock_find_in_range_node(start, end, size, align,
+ MAX_NUMNODES);
}
/*
*idx = ULLONG_MAX;
}
+/**
+ * __next_free_mem_range_rev - next function for for_each_free_mem_range_reverse()
+ * @idx: pointer to u64 loop variable
+ * @nid: nid: node selector, %MAX_NUMNODES for all nodes
+ * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
+ * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
+ * @p_nid: ptr to int for nid of the range, can be %NULL
+ *
+ * Reverse of __next_free_mem_range().
+ */
+void __init_memblock __next_free_mem_range_rev(u64 *idx, int nid,
+ phys_addr_t *out_start,
+ phys_addr_t *out_end, int *out_nid)
+{
+ struct memblock_type *mem = &memblock.memory;
+ struct memblock_type *rsv = &memblock.reserved;
+ int mi = *idx & 0xffffffff;
+ int ri = *idx >> 32;
+
+ if (*idx == (u64)ULLONG_MAX) {
+ mi = mem->cnt - 1;
+ ri = rsv->cnt;
+ }
+
+ for ( ; mi >= 0; mi--) {
+ struct memblock_region *m = &mem->regions[mi];
+ phys_addr_t m_start = m->base;
+ phys_addr_t m_end = m->base + m->size;
+
+ /* only memory regions are associated with nodes, check it */
+ if (nid != MAX_NUMNODES && nid != memblock_get_region_node(m))
+ continue;
+
+ /* scan areas before each reservation for intersection */
+ for ( ; ri >= 0; ri--) {
+ struct memblock_region *r = &rsv->regions[ri];
+ phys_addr_t r_start = ri ? r[-1].base + r[-1].size : 0;
+ phys_addr_t r_end = ri < rsv->cnt ? r->base : ULLONG_MAX;
+
+ /* if ri advanced past mi, break out to advance mi */
+ if (r_end <= m_start)
+ break;
+ /* if the two regions intersect, we're done */
+ if (m_end > r_start) {
+ if (out_start)
+ *out_start = max(m_start, r_start);
+ if (out_end)
+ *out_end = min(m_end, r_end);
+ if (out_nid)
+ *out_nid = memblock_get_region_node(m);
+
+ if (m_start >= r_start)
+ mi--;
+ else
+ ri--;
+ *idx = (u32)mi | (u64)ri << 32;
+ return;
+ }
+ }
+ }
+
+ *idx = ULLONG_MAX;
+}
+
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
/*
* Common iterator interface used to define for_each_mem_range().
}
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
-phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
+static phys_addr_t __init memblock_alloc_base_nid(phys_addr_t size,
+ phys_addr_t align, phys_addr_t max_addr,
+ int nid)
{
phys_addr_t found;
- /* We align the size to limit fragmentation. Without this, a lot of
- * small allocs quickly eat up the whole reserve array on sparc
- */
- size = round_up(size, align);
-
- found = memblock_find_in_range(0, max_addr, size, align);
+ found = memblock_find_in_range_node(0, max_addr, size, align, nid);
if (found && !memblock_reserve(found, size))
return found;
return 0;
}
+phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid)
+{
+ return memblock_alloc_base_nid(size, align, MEMBLOCK_ALLOC_ACCESSIBLE, nid);
+}
+
+phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
+{
+ return memblock_alloc_base_nid(size, align, max_addr, MAX_NUMNODES);
+}
+
phys_addr_t __init memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
{
phys_addr_t alloc;
return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
}
-
-/*
- * Additional node-local top-down allocators.
- *
- * WARNING: Only available after early_node_map[] has been populated,
- * on some architectures, that is after all the calls to add_active_range()
- * have been done to populate it.
- */
-
-static phys_addr_t __init memblock_nid_range_rev(phys_addr_t start,
- phys_addr_t end, int *nid)
-{
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
- unsigned long start_pfn, end_pfn;
- int i;
-
- for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, nid)
- if (end > PFN_PHYS(start_pfn) && end <= PFN_PHYS(end_pfn))
- return max(start, PFN_PHYS(start_pfn));
-#endif
- *nid = 0;
- return start;
-}
-
-phys_addr_t __init memblock_find_in_range_node(phys_addr_t start,
- phys_addr_t end,
- phys_addr_t size,
- phys_addr_t align, int nid)
-{
- struct memblock_type *mem = &memblock.memory;
- int i;
-
- BUG_ON(0 == size);
-
- /* Pump up max_addr */
- if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
- end = memblock.current_limit;
-
- for (i = mem->cnt - 1; i >= 0; i--) {
- struct memblock_region *r = &mem->regions[i];
- phys_addr_t base = max(start, r->base);
- phys_addr_t top = min(end, r->base + r->size);
-
- while (base < top) {
- phys_addr_t tbase, ret;
- int tnid;
-
- tbase = memblock_nid_range_rev(base, top, &tnid);
- if (nid == MAX_NUMNODES || tnid == nid) {
- ret = memblock_find_region(tbase, top, size, align);
- if (ret)
- return ret;
- }
- top = tbase;
- }
- }
-
- return 0;
-}
-
-phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid)
-{
- phys_addr_t found;
-
- /*
- * We align the size to limit fragmentation. Without this, a lot of
- * small allocs quickly eat up the whole reserve array on sparc
- */
- size = round_up(size, align);
-
- found = memblock_find_in_range_node(0, MEMBLOCK_ALLOC_ACCESSIBLE,
- size, align, nid);
- if (found && !memblock_reserve(found, size))
- return found;
-
- return 0;
-}
-
phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid)
{
phys_addr_t res = memblock_alloc_nid(size, align, nid);
projects / linux-beck.git / commitdiff