#include "internal.h"
+/**
+ * DOC: memblock overview
+ *
+ * Memblock is a method of managing memory regions during the early
+ * boot period when the usual kernel memory allocators are not up and
+ * running.
+ *
+ * Memblock views the system memory as collections of contiguous
+ * regions. There are several types of these collections:
+ *
+ * * ``memory`` - describes the physical memory available to the
+ * kernel; this may differ from the actual physical memory installed
+ * in the system, for instance when the memory is restricted with
+ * ``mem=`` command line parameter
+ * * ``reserved`` - describes the regions that were allocated
+ * * ``physmap`` - describes the actual physical memory regardless of
+ * the possible restrictions; the ``physmap`` type is only available
+ * on some architectures.
+ *
+ * Each region is represented by :c:type:`struct memblock_region` that
+ * defines the region extents, its attributes and NUMA node id on NUMA
+ * systems. Every memory type is described by the :c:type:`struct
+ * memblock_type` which contains an array of memory regions along with
+ * the allocator metadata. The memory types are nicely wrapped with
+ * :c:type:`struct memblock`. This structure is statically initialzed
+ * at build time. The region arrays for the "memory" and "reserved"
+ * types are initially sized to %INIT_MEMBLOCK_REGIONS and for the
+ * "physmap" type to %INIT_PHYSMEM_REGIONS.
+ * The :c:func:`memblock_allow_resize` enables automatic resizing of
+ * the region arrays during addition of new regions. This feature
+ * should be used with care so that memory allocated for the region
+ * array will not overlap with areas that should be reserved, for
+ * example initrd.
+ *
+ * The early architecture setup should tell memblock what the physical
+ * memory layout is by using :c:func:`memblock_add` or
+ * :c:func:`memblock_add_node` functions. The first function does not
+ * assign the region to a NUMA node and it is appropriate for UMA
+ * systems. Yet, it is possible to use it on NUMA systems as well and
+ * assign the region to a NUMA node later in the setup process using
+ * :c:func:`memblock_set_node`. The :c:func:`memblock_add_node`
+ * performs such an assignment directly.
+ *
+ * Once memblock is setup the memory can be allocated using either
+ * memblock or bootmem APIs.
+ *
+ * As the system boot progresses, the architecture specific
+ * :c:func:`mem_init` function frees all the memory to the buddy page
+ * allocator.
+ *
+ * If an architecure enables %CONFIG_ARCH_DISCARD_MEMBLOCK, the
+ * memblock data structures will be discarded after the system
+ * initialization compltes.
+ */
+
static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
static int memblock_memory_in_slab __initdata_memblock = 0;
static int memblock_reserved_in_slab __initdata_memblock = 0;
-ulong __init_memblock choose_memblock_flags(void)
+enum memblock_flags __init_memblock choose_memblock_flags(void)
{
return system_has_some_mirror ? MEMBLOCK_MIRROR : MEMBLOCK_NONE;
}
return i < type->cnt;
}
-/*
+/**
* __memblock_find_range_bottom_up - find free area utility in bottom-up
* @start: start of candidate range
- * @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE}
+ * @end: end of candidate range, can be %MEMBLOCK_ALLOC_ANYWHERE or
+ * %MEMBLOCK_ALLOC_ACCESSIBLE
* @size: size of free area to find
* @align: alignment of free area to find
* @nid: nid of the free area to find, %NUMA_NO_NODE for any node
*
* Utility called from memblock_find_in_range_node(), find free area bottom-up.
*
- * RETURNS:
+ * Return:
* Found address on success, 0 on failure.
*/
static phys_addr_t __init_memblock
__memblock_find_range_bottom_up(phys_addr_t start, phys_addr_t end,
phys_addr_t size, phys_addr_t align, int nid,
- ulong flags)
+ enum memblock_flags flags)
{
phys_addr_t this_start, this_end, cand;
u64 i;
/**
* __memblock_find_range_top_down - find free area utility, in top-down
* @start: start of candidate range
- * @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE}
+ * @end: end of candidate range, can be %MEMBLOCK_ALLOC_ANYWHERE or
+ * %MEMBLOCK_ALLOC_ACCESSIBLE
* @size: size of free area to find
* @align: alignment of free area to find
* @nid: nid of the free area to find, %NUMA_NO_NODE for any node
*
* Utility called from memblock_find_in_range_node(), find free area top-down.
*
- * RETURNS:
+ * Return:
* Found address on success, 0 on failure.
*/
static phys_addr_t __init_memblock
__memblock_find_range_top_down(phys_addr_t start, phys_addr_t end,
phys_addr_t size, phys_addr_t align, int nid,
- ulong flags)
+ enum memblock_flags flags)
{
phys_addr_t this_start, this_end, cand;
u64 i;
* @size: size of free area to find
* @align: alignment of free area to find
* @start: start of candidate range
- * @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE}
+ * @end: end of candidate range, can be %MEMBLOCK_ALLOC_ANYWHERE or
+ * %MEMBLOCK_ALLOC_ACCESSIBLE
* @nid: nid of the free area to find, %NUMA_NO_NODE for any node
* @flags: pick from blocks based on memory attributes
*
*
* If bottom-up allocation failed, will try to allocate memory top-down.
*
- * RETURNS:
+ * Return:
* Found address on success, 0 on failure.
*/
phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t size,
phys_addr_t align, phys_addr_t start,
- phys_addr_t end, int nid, ulong flags)
+ phys_addr_t end, int nid,
+ enum memblock_flags flags)
{
phys_addr_t kernel_end, ret;
/**
* 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}
+ * @end: end of candidate range, can be %MEMBLOCK_ALLOC_ANYWHERE or
+ * %MEMBLOCK_ALLOC_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:
+ * Return:
* Found address on success, 0 on failure.
*/
phys_addr_t __init_memblock memblock_find_in_range(phys_addr_t start,
phys_addr_t align)
{
phys_addr_t ret;
- ulong flags = choose_memblock_flags();
+ enum memblock_flags flags = choose_memblock_flags();
again:
ret = memblock_find_in_range_node(size, align, start, end,
#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
/**
- * Discard memory and reserved arrays if they were allocated
+ * memblock_discard - discard memory and reserved arrays if they were allocated
*/
void __init memblock_discard(void)
{
*
* Double the size of the @type regions array. If memblock is being used to
* allocate memory for a new reserved regions array and there is a previously
- * allocated memory range [@new_area_start,@new_area_start+@new_area_size]
+ * allocated memory range [@new_area_start, @new_area_start + @new_area_size]
* waiting to be reserved, ensure the memory used by the new array does
* not overlap.
*
- * RETURNS:
+ * Return:
* 0 on success, -1 on failure.
*/
static int __init_memblock memblock_double_array(struct memblock_type *type,
* @nid: node id of the new region
* @flags: flags of the new region
*
- * Insert new memblock region [@base,@base+@size) into @type at @idx.
+ * Insert new memblock region [@base, @base + @size) into @type at @idx.
* @type must already have extra room to accommodate the new region.
*/
static void __init_memblock memblock_insert_region(struct memblock_type *type,
int idx, phys_addr_t base,
phys_addr_t size,
- int nid, unsigned long flags)
+ int nid,
+ enum memblock_flags flags)
{
struct memblock_region *rgn = &type->regions[idx];
* @nid: nid of the new region
* @flags: flags of the new region
*
- * Add new memblock region [@base,@base+@size) into @type. The new region
+ * Add new memblock region [@base, @base + @size) into @type. The new region
* is allowed to overlap with existing ones - overlaps don't affect already
* existing regions. @type is guaranteed to be minimal (all neighbouring
* compatible regions are merged) after the addition.
*
- * RETURNS:
+ * Return:
* 0 on success, -errno on failure.
*/
int __init_memblock memblock_add_range(struct memblock_type *type,
phys_addr_t base, phys_addr_t size,
- int nid, unsigned long flags)
+ int nid, enum memblock_flags flags)
{
bool insert = false;
phys_addr_t obase = base;
}
}
+/**
+ * memblock_add_node - add new memblock region within a NUMA node
+ * @base: base address of the new region
+ * @size: size of the new region
+ * @nid: nid of the new region
+ *
+ * Add new memblock region [@base, @base + @size) to the "memory"
+ * type. See memblock_add_range() description for mode details
+ *
+ * Return:
+ * 0 on success, -errno on failure.
+ */
int __init_memblock memblock_add_node(phys_addr_t base, phys_addr_t size,
int nid)
{
return memblock_add_range(&memblock.memory, base, size, nid, 0);
}
+/**
+ * memblock_add - add new memblock region
+ * @base: base address of the new region
+ * @size: size of the new region
+ *
+ * Add new memblock region [@base, @base + @size) to the "memory"
+ * type. See memblock_add_range() description for mode details
+ *
+ * Return:
+ * 0 on success, -errno on failure.
+ */
int __init_memblock memblock_add(phys_addr_t base, phys_addr_t size)
{
phys_addr_t end = base + size - 1;
* @end_rgn: out parameter for the end of isolated region
*
* Walk @type and ensure that regions don't cross the boundaries defined by
- * [@base,@base+@size). Crossing regions are split at the boundaries,
+ * [@base, @base + @size). Crossing regions are split at the boundaries,
* which may create at most two more regions. The index of the first
* region inside the range is returned in *@start_rgn and end in *@end_rgn.
*
- * RETURNS:
+ * Return:
* 0 on success, -errno on failure.
*/
static int __init_memblock memblock_isolate_range(struct memblock_type *type,
}
/**
+ * memblock_setclr_flag - set or clear flag for a memory region
+ * @base: base address of the region
+ * @size: size of the region
+ * @set: set or clear the flag
+ * @flag: the flag to udpate
*
* This function isolates region [@base, @base + @size), and sets/clears flag
*
- * Return 0 on success, -errno on failure.
+ * Return: 0 on success, -errno on failure.
*/
static int __init_memblock memblock_setclr_flag(phys_addr_t base,
phys_addr_t size, int set, int flag)
* @base: the base phys addr of the region
* @size: the size of the region
*
- * Return 0 on success, -errno on failure.
+ * Return: 0 on success, -errno on failure.
*/
int __init_memblock memblock_mark_hotplug(phys_addr_t base, phys_addr_t size)
{
* @base: the base phys addr of the region
* @size: the size of the region
*
- * Return 0 on success, -errno on failure.
+ * Return: 0 on success, -errno on failure.
*/
int __init_memblock memblock_clear_hotplug(phys_addr_t base, phys_addr_t size)
{
* @base: the base phys addr of the region
* @size: the size of the region
*
- * Return 0 on success, -errno on failure.
+ * Return: 0 on success, -errno on failure.
*/
int __init_memblock memblock_mark_mirror(phys_addr_t base, phys_addr_t size)
{
* @base: the base phys addr of the region
* @size: the size of the region
*
- * Return 0 on success, -errno on failure.
+ * Return: 0 on success, -errno on failure.
*/
int __init_memblock memblock_mark_nomap(phys_addr_t base, phys_addr_t size)
{
* @base: the base phys addr of the region
* @size: the size of the region
*
- * Return 0 on success, -errno on failure.
+ * Return: 0 on success, -errno on failure.
*/
int __init_memblock memblock_clear_nomap(phys_addr_t base, phys_addr_t size)
{
* As both region arrays are sorted, the function advances the two indices
* in lockstep and returns each intersection.
*/
-void __init_memblock __next_mem_range(u64 *idx, int nid, ulong flags,
+void __init_memblock __next_mem_range(u64 *idx, int nid,
+ enum memblock_flags flags,
struct memblock_type *type_a,
struct memblock_type *type_b,
phys_addr_t *out_start,
/**
* __next_mem_range_rev - generic next function for for_each_*_range_rev()
*
- * Finds the next range from type_a which is not marked as unsuitable
- * in type_b.
- *
* @idx: pointer to u64 loop variable
* @nid: node selector, %NUMA_NO_NODE for all nodes
* @flags: pick from blocks based on memory attributes
* @out_end: ptr to phys_addr_t for end address of the range, can be %NULL
* @out_nid: ptr to int for nid of the range, can be %NULL
*
+ * Finds the next range from type_a which is not marked as unsuitable
+ * in type_b.
+ *
* Reverse of __next_mem_range().
*/
-void __init_memblock __next_mem_range_rev(u64 *idx, int nid, ulong flags,
+void __init_memblock __next_mem_range_rev(u64 *idx, int nid,
+ enum memblock_flags flags,
struct memblock_type *type_a,
struct memblock_type *type_b,
phys_addr_t *out_start,
* @type: memblock type to set node ID for
* @nid: node ID to set
*
- * Set the nid of memblock @type regions in [@base,@base+@size) to @nid.
+ * Set the nid of memblock @type regions in [@base, @base + @size) to @nid.
* Regions which cross the area boundaries are split as necessary.
*
- * RETURNS:
+ * Return:
* 0 on success, -errno on failure.
*/
int __init_memblock memblock_set_node(phys_addr_t base, phys_addr_t size,
static phys_addr_t __init memblock_alloc_range_nid(phys_addr_t size,
phys_addr_t align, phys_addr_t start,
- phys_addr_t end, int nid, ulong flags)
+ phys_addr_t end, int nid,
+ enum memblock_flags flags)
{
phys_addr_t found;
phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align,
phys_addr_t start, phys_addr_t end,
- ulong flags)
+ enum memblock_flags flags)
{
return memblock_alloc_range_nid(size, align, start, end, NUMA_NO_NODE,
flags);
phys_addr_t __init memblock_alloc_base_nid(phys_addr_t size,
phys_addr_t align, phys_addr_t max_addr,
- int nid, ulong flags)
+ int nid, enum memblock_flags flags)
{
return memblock_alloc_range_nid(size, align, 0, max_addr, nid, flags);
}
phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid)
{
- ulong flags = choose_memblock_flags();
+ enum memblock_flags flags = choose_memblock_flags();
phys_addr_t ret;
again:
* The allocation is performed from memory region limited by
* memblock.current_limit if @max_addr == %BOOTMEM_ALLOC_ACCESSIBLE.
*
- * The memory block is aligned on SMP_CACHE_BYTES if @align == 0.
+ * The memory block is aligned on %SMP_CACHE_BYTES if @align == 0.
*
* The phys address of allocated boot memory block is converted to virtual and
* allocated memory is reset to 0.
* In addition, function sets the min_count to 0 using kmemleak_alloc for
* allocated boot memory block, so that it is never reported as leaks.
*
- * RETURNS:
+ * Return:
* Virtual address of allocated memory block on success, NULL on failure.
*/
static void * __init memblock_virt_alloc_internal(
{
phys_addr_t alloc;
void *ptr;
- ulong flags = choose_memblock_flags();
+ enum memblock_flags flags = choose_memblock_flags();
if (WARN_ONCE(nid == MAX_NUMNODES, "Usage of MAX_NUMNODES is deprecated. Use NUMA_NO_NODE instead\n"))
nid = NUMA_NO_NODE;
* info), if enabled. Does not zero allocated memory, does not panic if request
* cannot be satisfied.
*
- * RETURNS:
+ * Return:
* Virtual address of allocated memory block on success, NULL on failure.
*/
void * __init memblock_virt_alloc_try_nid_raw(
* Public function, provides additional debug information (including caller
* info), if enabled. This function zeroes the allocated memory.
*
- * RETURNS:
+ * Return:
* Virtual address of allocated memory block on success, NULL on failure.
*/
void * __init memblock_virt_alloc_try_nid_nopanic(
* which provides debug information (including caller info), if enabled,
* and panics if the request can not be satisfied.
*
- * RETURNS:
+ * Return:
* Virtual address of allocated memory block on success, NULL on failure.
*/
void * __init memblock_virt_alloc_try_nid(
memblock_remove_range(&memblock.reserved, base, size);
}
-/*
+/**
* __memblock_free_late - free bootmem block pages directly to buddy allocator
- * @addr: phys starting address of the boot memory block
+ * @base: phys starting address of the boot memory block
* @size: size of the boot memory block in bytes
*
* This is only useful when the bootmem allocator has already been torn
* @base: base of region to check
* @size: size of region to check
*
- * Check if the region [@base, @base+@size) is a subset of a memory block.
+ * Check if the region [@base, @base + @size) is a subset of a memory block.
*
- * RETURNS:
+ * Return:
* 0 if false, non-zero if true
*/
bool __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t size)
* @base: base of region to check
* @size: size of region to check
*
- * Check if the region [@base, @base+@size) intersects a reserved memory block.
+ * Check if the region [@base, @base + @size) intersects a reserved
+ * memory block.
*
- * RETURNS:
+ * Return:
* True if they intersect, false if not.
*/
bool __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t size)
static void __init_memblock memblock_dump(struct memblock_type *type)
{
phys_addr_t base, end, size;
- unsigned long flags;
+ enum memblock_flags flags;
int idx;
struct memblock_region *rgn;
snprintf(nid_buf, sizeof(nid_buf), " on node %d",
memblock_get_region_node(rgn));
#endif
- pr_info(" %s[%#x]\t[%pa-%pa], %pa bytes%s flags: %#lx\n",
+ pr_info(" %s[%#x]\t[%pa-%pa], %pa bytes%s flags: %#x\n",
type->name, idx, &base, &end, &size, nid_buf, flags);
}
}
projects / mirror_ubuntu-hirsute-kernel.git / blobdiff