mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 23:40:53 +07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: ia64: add sparse annotation to __ia64_per_cpu_var() percpu: implement kernel memory based chunk allocation percpu: move vmalloc based chunk management into percpu-vm.c percpu: misc preparations for nommu support percpu: reorganize chunk creation and destruction percpu: factor out pcpu_addr_in_first/reserved_chunk() and update per_cpu_ptr_to_phys()
This commit is contained in:
Linus Torvalds
commit
9c688c114c
@ -39,7 +39,10 @@ extern void *per_cpu_init(void);
|
||||
* On the positive side, using __ia64_per_cpu_var() instead of __get_cpu_var() is slightly
|
||||
* more efficient.
|
||||
*/
|
||||
#define __ia64_per_cpu_var(var) var
|
||||
#define __ia64_per_cpu_var(var) (*({ \
|
||||
__verify_pcpu_ptr(&(var)); \
|
||||
((typeof(var) __kernel __force *)&(var)); \
|
||||
}))
|
||||
|
||||
#include <asm-generic/percpu.h>
|
||||
|
||||
|
||||
104
mm/percpu-km.c
Normal file
104
mm/percpu-km.c
Normal file
@ -0,0 +1,104 @@
|
||||
/*
|
||||
* mm/percpu-km.c - kernel memory based chunk allocation
|
||||
*
|
||||
* Copyright (C) 2010 SUSE Linux Products GmbH
|
||||
* Copyright (C) 2010 Tejun Heo <tj@kernel.org>
|
||||
*
|
||||
* This file is released under the GPLv2.
|
||||
*
|
||||
* Chunks are allocated as a contiguous kernel memory using gfp
|
||||
* allocation. This is to be used on nommu architectures.
|
||||
*
|
||||
* To use percpu-km,
|
||||
*
|
||||
* - define CONFIG_NEED_PER_CPU_KM from the arch Kconfig.
|
||||
*
|
||||
* - CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK must not be defined. It's
|
||||
* not compatible with PER_CPU_KM. EMBED_FIRST_CHUNK should work
|
||||
* fine.
|
||||
*
|
||||
* - NUMA is not supported. When setting up the first chunk,
|
||||
* @cpu_distance_fn should be NULL or report all CPUs to be nearer
|
||||
* than or at LOCAL_DISTANCE.
|
||||
*
|
||||
* - It's best if the chunk size is power of two multiple of
|
||||
* PAGE_SIZE. Because each chunk is allocated as a contiguous
|
||||
* kernel memory block using alloc_pages(), memory will be wasted if
|
||||
* chunk size is not aligned. percpu-km code will whine about it.
|
||||
*/
|
||||
|
||||
#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
|
||||
#error "contiguous percpu allocation is incompatible with paged first chunk"
|
||||
#endif
|
||||
|
||||
#include <linux/log2.h>
|
||||
|
||||
static int pcpu_populate_chunk(struct pcpu_chunk *chunk, int off, int size)
|
||||
{
|
||||
/* noop */
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk, int off, int size)
|
||||
{
|
||||
/* nada */
|
||||
}
|
||||
|
||||
static struct pcpu_chunk *pcpu_create_chunk(void)
|
||||
{
|
||||
const int nr_pages = pcpu_group_sizes[0] >> PAGE_SHIFT;
|
||||
struct pcpu_chunk *chunk;
|
||||
struct page *pages;
|
||||
int i;
|
||||
|
||||
chunk = pcpu_alloc_chunk();
|
||||
if (!chunk)
|
||||
return NULL;
|
||||
|
||||
pages = alloc_pages(GFP_KERNEL, order_base_2(nr_pages));
|
||||
if (!pages) {
|
||||
pcpu_free_chunk(chunk);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
for (i = 0; i < nr_pages; i++)
|
||||
pcpu_set_page_chunk(nth_page(pages, i), chunk);
|
||||
|
||||
chunk->data = pages;
|
||||
chunk->base_addr = page_address(pages) - pcpu_group_offsets[0];
|
||||
return chunk;
|
||||
}
|
||||
|
||||
static void pcpu_destroy_chunk(struct pcpu_chunk *chunk)
|
||||
{
|
||||
const int nr_pages = pcpu_group_sizes[0] >> PAGE_SHIFT;
|
||||
|
||||
if (chunk && chunk->data)
|
||||
__free_pages(chunk->data, order_base_2(nr_pages));
|
||||
pcpu_free_chunk(chunk);
|
||||
}
|
||||
|
||||
static struct page *pcpu_addr_to_page(void *addr)
|
||||
{
|
||||
return virt_to_page(addr);
|
||||
}
|
||||
|
||||
static int __init pcpu_verify_alloc_info(const struct pcpu_alloc_info *ai)
|
||||
{
|
||||
size_t nr_pages, alloc_pages;
|
||||
|
||||
/* all units must be in a single group */
|
||||
if (ai->nr_groups != 1) {
|
||||
printk(KERN_CRIT "percpu: can't handle more than one groups\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
nr_pages = (ai->groups[0].nr_units * ai->unit_size) >> PAGE_SHIFT;
|
||||
alloc_pages = roundup_pow_of_two(nr_pages);
|
||||
|
||||
if (alloc_pages > nr_pages)
|
||||
printk(KERN_WARNING "percpu: wasting %zu pages per chunk\n",
|
||||
alloc_pages - nr_pages);
|
||||
|
||||
return 0;
|
||||
}
|
||||
451
mm/percpu-vm.c
Normal file
451
mm/percpu-vm.c
Normal file
@ -0,0 +1,451 @@
|
||||
/*
|
||||
* mm/percpu-vm.c - vmalloc area based chunk allocation
|
||||
*
|
||||
* Copyright (C) 2010 SUSE Linux Products GmbH
|
||||
* Copyright (C) 2010 Tejun Heo <tj@kernel.org>
|
||||
*
|
||||
* This file is released under the GPLv2.
|
||||
*
|
||||
* Chunks are mapped into vmalloc areas and populated page by page.
|
||||
* This is the default chunk allocator.
|
||||
*/
|
||||
|
||||
static struct page *pcpu_chunk_page(struct pcpu_chunk *chunk,
|
||||
unsigned int cpu, int page_idx)
|
||||
{
|
||||
/* must not be used on pre-mapped chunk */
|
||||
WARN_ON(chunk->immutable);
|
||||
|
||||
return vmalloc_to_page((void *)pcpu_chunk_addr(chunk, cpu, page_idx));
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_get_pages_and_bitmap - get temp pages array and bitmap
|
||||
* @chunk: chunk of interest
|
||||
* @bitmapp: output parameter for bitmap
|
||||
* @may_alloc: may allocate the array
|
||||
*
|
||||
* Returns pointer to array of pointers to struct page and bitmap,
|
||||
* both of which can be indexed with pcpu_page_idx(). The returned
|
||||
* array is cleared to zero and *@bitmapp is copied from
|
||||
* @chunk->populated. Note that there is only one array and bitmap
|
||||
* and access exclusion is the caller's responsibility.
|
||||
*
|
||||
* CONTEXT:
|
||||
* pcpu_alloc_mutex and does GFP_KERNEL allocation if @may_alloc.
|
||||
* Otherwise, don't care.
|
||||
*
|
||||
* RETURNS:
|
||||
* Pointer to temp pages array on success, NULL on failure.
|
||||
*/
|
||||
static struct page **pcpu_get_pages_and_bitmap(struct pcpu_chunk *chunk,
|
||||
unsigned long **bitmapp,
|
||||
bool may_alloc)
|
||||
{
|
||||
static struct page **pages;
|
||||
static unsigned long *bitmap;
|
||||
size_t pages_size = pcpu_nr_units * pcpu_unit_pages * sizeof(pages[0]);
|
||||
size_t bitmap_size = BITS_TO_LONGS(pcpu_unit_pages) *
|
||||
sizeof(unsigned long);
|
||||
|
||||
if (!pages || !bitmap) {
|
||||
if (may_alloc && !pages)
|
||||
pages = pcpu_mem_alloc(pages_size);
|
||||
if (may_alloc && !bitmap)
|
||||
bitmap = pcpu_mem_alloc(bitmap_size);
|
||||
if (!pages || !bitmap)
|
||||
return NULL;
|
||||
}
|
||||
|
||||
memset(pages, 0, pages_size);
|
||||
bitmap_copy(bitmap, chunk->populated, pcpu_unit_pages);
|
||||
|
||||
*bitmapp = bitmap;
|
||||
return pages;
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_free_pages - free pages which were allocated for @chunk
|
||||
* @chunk: chunk pages were allocated for
|
||||
* @pages: array of pages to be freed, indexed by pcpu_page_idx()
|
||||
* @populated: populated bitmap
|
||||
* @page_start: page index of the first page to be freed
|
||||
* @page_end: page index of the last page to be freed + 1
|
||||
*
|
||||
* Free pages [@page_start and @page_end) in @pages for all units.
|
||||
* The pages were allocated for @chunk.
|
||||
*/
|
||||
static void pcpu_free_pages(struct pcpu_chunk *chunk,
|
||||
struct page **pages, unsigned long *populated,
|
||||
int page_start, int page_end)
|
||||
{
|
||||
unsigned int cpu;
|
||||
int i;
|
||||
|
||||
for_each_possible_cpu(cpu) {
|
||||
for (i = page_start; i < page_end; i++) {
|
||||
struct page *page = pages[pcpu_page_idx(cpu, i)];
|
||||
|
||||
if (page)
|
||||
__free_page(page);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_alloc_pages - allocates pages for @chunk
|
||||
* @chunk: target chunk
|
||||
* @pages: array to put the allocated pages into, indexed by pcpu_page_idx()
|
||||
* @populated: populated bitmap
|
||||
* @page_start: page index of the first page to be allocated
|
||||
* @page_end: page index of the last page to be allocated + 1
|
||||
*
|
||||
* Allocate pages [@page_start,@page_end) into @pages for all units.
|
||||
* The allocation is for @chunk. Percpu core doesn't care about the
|
||||
* content of @pages and will pass it verbatim to pcpu_map_pages().
|
||||
*/
|
||||
static int pcpu_alloc_pages(struct pcpu_chunk *chunk,
|
||||
struct page **pages, unsigned long *populated,
|
||||
int page_start, int page_end)
|
||||
{
|
||||
const gfp_t gfp = GFP_KERNEL | __GFP_HIGHMEM | __GFP_COLD;
|
||||
unsigned int cpu;
|
||||
int i;
|
||||
|
||||
for_each_possible_cpu(cpu) {
|
||||
for (i = page_start; i < page_end; i++) {
|
||||
struct page **pagep = &pages[pcpu_page_idx(cpu, i)];
|
||||
|
||||
*pagep = alloc_pages_node(cpu_to_node(cpu), gfp, 0);
|
||||
if (!*pagep) {
|
||||
pcpu_free_pages(chunk, pages, populated,
|
||||
page_start, page_end);
|
||||
return -ENOMEM;
|
||||
}
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_pre_unmap_flush - flush cache prior to unmapping
|
||||
* @chunk: chunk the regions to be flushed belongs to
|
||||
* @page_start: page index of the first page to be flushed
|
||||
* @page_end: page index of the last page to be flushed + 1
|
||||
*
|
||||
* Pages in [@page_start,@page_end) of @chunk are about to be
|
||||
* unmapped. Flush cache. As each flushing trial can be very
|
||||
* expensive, issue flush on the whole region at once rather than
|
||||
* doing it for each cpu. This could be an overkill but is more
|
||||
* scalable.
|
||||
*/
|
||||
static void pcpu_pre_unmap_flush(struct pcpu_chunk *chunk,
|
||||
int page_start, int page_end)
|
||||
{
|
||||
flush_cache_vunmap(
|
||||
pcpu_chunk_addr(chunk, pcpu_first_unit_cpu, page_start),
|
||||
pcpu_chunk_addr(chunk, pcpu_last_unit_cpu, page_end));
|
||||
}
|
||||
|
||||
static void __pcpu_unmap_pages(unsigned long addr, int nr_pages)
|
||||
{
|
||||
unmap_kernel_range_noflush(addr, nr_pages << PAGE_SHIFT);
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_unmap_pages - unmap pages out of a pcpu_chunk
|
||||
* @chunk: chunk of interest
|
||||
* @pages: pages array which can be used to pass information to free
|
||||
* @populated: populated bitmap
|
||||
* @page_start: page index of the first page to unmap
|
||||
* @page_end: page index of the last page to unmap + 1
|
||||
*
|
||||
* For each cpu, unmap pages [@page_start,@page_end) out of @chunk.
|
||||
* Corresponding elements in @pages were cleared by the caller and can
|
||||
* be used to carry information to pcpu_free_pages() which will be
|
||||
* called after all unmaps are finished. The caller should call
|
||||
* proper pre/post flush functions.
|
||||
*/
|
||||
static void pcpu_unmap_pages(struct pcpu_chunk *chunk,
|
||||
struct page **pages, unsigned long *populated,
|
||||
int page_start, int page_end)
|
||||
{
|
||||
unsigned int cpu;
|
||||
int i;
|
||||
|
||||
for_each_possible_cpu(cpu) {
|
||||
for (i = page_start; i < page_end; i++) {
|
||||
struct page *page;
|
||||
|
||||
page = pcpu_chunk_page(chunk, cpu, i);
|
||||
WARN_ON(!page);
|
||||
pages[pcpu_page_idx(cpu, i)] = page;
|
||||
}
|
||||
__pcpu_unmap_pages(pcpu_chunk_addr(chunk, cpu, page_start),
|
||||
page_end - page_start);
|
||||
}
|
||||
|
||||
for (i = page_start; i < page_end; i++)
|
||||
__clear_bit(i, populated);
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_post_unmap_tlb_flush - flush TLB after unmapping
|
||||
* @chunk: pcpu_chunk the regions to be flushed belong to
|
||||
* @page_start: page index of the first page to be flushed
|
||||
* @page_end: page index of the last page to be flushed + 1
|
||||
*
|
||||
* Pages [@page_start,@page_end) of @chunk have been unmapped. Flush
|
||||
* TLB for the regions. This can be skipped if the area is to be
|
||||
* returned to vmalloc as vmalloc will handle TLB flushing lazily.
|
||||
*
|
||||
* As with pcpu_pre_unmap_flush(), TLB flushing also is done at once
|
||||
* for the whole region.
|
||||
*/
|
||||
static void pcpu_post_unmap_tlb_flush(struct pcpu_chunk *chunk,
|
||||
int page_start, int page_end)
|
||||
{
|
||||
flush_tlb_kernel_range(
|
||||
pcpu_chunk_addr(chunk, pcpu_first_unit_cpu, page_start),
|
||||
pcpu_chunk_addr(chunk, pcpu_last_unit_cpu, page_end));
|
||||
}
|
||||
|
||||
static int __pcpu_map_pages(unsigned long addr, struct page **pages,
|
||||
int nr_pages)
|
||||
{
|
||||
return map_kernel_range_noflush(addr, nr_pages << PAGE_SHIFT,
|
||||
PAGE_KERNEL, pages);
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_map_pages - map pages into a pcpu_chunk
|
||||
* @chunk: chunk of interest
|
||||
* @pages: pages array containing pages to be mapped
|
||||
* @populated: populated bitmap
|
||||
* @page_start: page index of the first page to map
|
||||
* @page_end: page index of the last page to map + 1
|
||||
*
|
||||
* For each cpu, map pages [@page_start,@page_end) into @chunk. The
|
||||
* caller is responsible for calling pcpu_post_map_flush() after all
|
||||
* mappings are complete.
|
||||
*
|
||||
* This function is responsible for setting corresponding bits in
|
||||
* @chunk->populated bitmap and whatever is necessary for reverse
|
||||
* lookup (addr -> chunk).
|
||||
*/
|
||||
static int pcpu_map_pages(struct pcpu_chunk *chunk,
|
||||
struct page **pages, unsigned long *populated,
|
||||
int page_start, int page_end)
|
||||
{
|
||||
unsigned int cpu, tcpu;
|
||||
int i, err;
|
||||
|
||||
for_each_possible_cpu(cpu) {
|
||||
err = __pcpu_map_pages(pcpu_chunk_addr(chunk, cpu, page_start),
|
||||
&pages[pcpu_page_idx(cpu, page_start)],
|
||||
page_end - page_start);
|
||||
if (err < 0)
|
||||
goto err;
|
||||
}
|
||||
|
||||
/* mapping successful, link chunk and mark populated */
|
||||
for (i = page_start; i < page_end; i++) {
|
||||
for_each_possible_cpu(cpu)
|
||||
pcpu_set_page_chunk(pages[pcpu_page_idx(cpu, i)],
|
||||
chunk);
|
||||
__set_bit(i, populated);
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
err:
|
||||
for_each_possible_cpu(tcpu) {
|
||||
if (tcpu == cpu)
|
||||
break;
|
||||
__pcpu_unmap_pages(pcpu_chunk_addr(chunk, tcpu, page_start),
|
||||
page_end - page_start);
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_post_map_flush - flush cache after mapping
|
||||
* @chunk: pcpu_chunk the regions to be flushed belong to
|
||||
* @page_start: page index of the first page to be flushed
|
||||
* @page_end: page index of the last page to be flushed + 1
|
||||
*
|
||||
* Pages [@page_start,@page_end) of @chunk have been mapped. Flush
|
||||
* cache.
|
||||
*
|
||||
* As with pcpu_pre_unmap_flush(), TLB flushing also is done at once
|
||||
* for the whole region.
|
||||
*/
|
||||
static void pcpu_post_map_flush(struct pcpu_chunk *chunk,
|
||||
int page_start, int page_end)
|
||||
{
|
||||
flush_cache_vmap(
|
||||
pcpu_chunk_addr(chunk, pcpu_first_unit_cpu, page_start),
|
||||
pcpu_chunk_addr(chunk, pcpu_last_unit_cpu, page_end));
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_populate_chunk - populate and map an area of a pcpu_chunk
|
||||
* @chunk: chunk of interest
|
||||
* @off: offset to the area to populate
|
||||
* @size: size of the area to populate in bytes
|
||||
*
|
||||
* For each cpu, populate and map pages [@page_start,@page_end) into
|
||||
* @chunk. The area is cleared on return.
|
||||
*
|
||||
* CONTEXT:
|
||||
* pcpu_alloc_mutex, does GFP_KERNEL allocation.
|
||||
*/
|
||||
static int pcpu_populate_chunk(struct pcpu_chunk *chunk, int off, int size)
|
||||
{
|
||||
int page_start = PFN_DOWN(off);
|
||||
int page_end = PFN_UP(off + size);
|
||||
int free_end = page_start, unmap_end = page_start;
|
||||
struct page **pages;
|
||||
unsigned long *populated;
|
||||
unsigned int cpu;
|
||||
int rs, re, rc;
|
||||
|
||||
/* quick path, check whether all pages are already there */
|
||||
rs = page_start;
|
||||
pcpu_next_pop(chunk, &rs, &re, page_end);
|
||||
if (rs == page_start && re == page_end)
|
||||
goto clear;
|
||||
|
||||
/* need to allocate and map pages, this chunk can't be immutable */
|
||||
WARN_ON(chunk->immutable);
|
||||
|
||||
pages = pcpu_get_pages_and_bitmap(chunk, &populated, true);
|
||||
if (!pages)
|
||||
return -ENOMEM;
|
||||
|
||||
/* alloc and map */
|
||||
pcpu_for_each_unpop_region(chunk, rs, re, page_start, page_end) {
|
||||
rc = pcpu_alloc_pages(chunk, pages, populated, rs, re);
|
||||
if (rc)
|
||||
goto err_free;
|
||||
free_end = re;
|
||||
}
|
||||
|
||||
pcpu_for_each_unpop_region(chunk, rs, re, page_start, page_end) {
|
||||
rc = pcpu_map_pages(chunk, pages, populated, rs, re);
|
||||
if (rc)
|
||||
goto err_unmap;
|
||||
unmap_end = re;
|
||||
}
|
||||
pcpu_post_map_flush(chunk, page_start, page_end);
|
||||
|
||||
/* commit new bitmap */
|
||||
bitmap_copy(chunk->populated, populated, pcpu_unit_pages);
|
||||
clear:
|
||||
for_each_possible_cpu(cpu)
|
||||
memset((void *)pcpu_chunk_addr(chunk, cpu, 0) + off, 0, size);
|
||||
return 0;
|
||||
|
||||
err_unmap:
|
||||
pcpu_pre_unmap_flush(chunk, page_start, unmap_end);
|
||||
pcpu_for_each_unpop_region(chunk, rs, re, page_start, unmap_end)
|
||||
pcpu_unmap_pages(chunk, pages, populated, rs, re);
|
||||
pcpu_post_unmap_tlb_flush(chunk, page_start, unmap_end);
|
||||
err_free:
|
||||
pcpu_for_each_unpop_region(chunk, rs, re, page_start, free_end)
|
||||
pcpu_free_pages(chunk, pages, populated, rs, re);
|
||||
return rc;
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_depopulate_chunk - depopulate and unmap an area of a pcpu_chunk
|
||||
* @chunk: chunk to depopulate
|
||||
* @off: offset to the area to depopulate
|
||||
* @size: size of the area to depopulate in bytes
|
||||
* @flush: whether to flush cache and tlb or not
|
||||
*
|
||||
* For each cpu, depopulate and unmap pages [@page_start,@page_end)
|
||||
* from @chunk. If @flush is true, vcache is flushed before unmapping
|
||||
* and tlb after.
|
||||
*
|
||||
* CONTEXT:
|
||||
* pcpu_alloc_mutex.
|
||||
*/
|
||||
static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk, int off, int size)
|
||||
{
|
||||
int page_start = PFN_DOWN(off);
|
||||
int page_end = PFN_UP(off + size);
|
||||
struct page **pages;
|
||||
unsigned long *populated;
|
||||
int rs, re;
|
||||
|
||||
/* quick path, check whether it's empty already */
|
||||
rs = page_start;
|
||||
pcpu_next_unpop(chunk, &rs, &re, page_end);
|
||||
if (rs == page_start && re == page_end)
|
||||
return;
|
||||
|
||||
/* immutable chunks can't be depopulated */
|
||||
WARN_ON(chunk->immutable);
|
||||
|
||||
/*
|
||||
* If control reaches here, there must have been at least one
|
||||
* successful population attempt so the temp pages array must
|
||||
* be available now.
|
||||
*/
|
||||
pages = pcpu_get_pages_and_bitmap(chunk, &populated, false);
|
||||
BUG_ON(!pages);
|
||||
|
||||
/* unmap and free */
|
||||
pcpu_pre_unmap_flush(chunk, page_start, page_end);
|
||||
|
||||
pcpu_for_each_pop_region(chunk, rs, re, page_start, page_end)
|
||||
pcpu_unmap_pages(chunk, pages, populated, rs, re);
|
||||
|
||||
/* no need to flush tlb, vmalloc will handle it lazily */
|
||||
|
||||
pcpu_for_each_pop_region(chunk, rs, re, page_start, page_end)
|
||||
pcpu_free_pages(chunk, pages, populated, rs, re);
|
||||
|
||||
/* commit new bitmap */
|
||||
bitmap_copy(chunk->populated, populated, pcpu_unit_pages);
|
||||
}
|
||||
|
||||
static struct pcpu_chunk *pcpu_create_chunk(void)
|
||||
{
|
||||
struct pcpu_chunk *chunk;
|
||||
struct vm_struct **vms;
|
||||
|
||||
chunk = pcpu_alloc_chunk();
|
||||
if (!chunk)
|
||||
return NULL;
|
||||
|
||||
vms = pcpu_get_vm_areas(pcpu_group_offsets, pcpu_group_sizes,
|
||||
pcpu_nr_groups, pcpu_atom_size, GFP_KERNEL);
|
||||
if (!vms) {
|
||||
pcpu_free_chunk(chunk);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
chunk->data = vms;
|
||||
chunk->base_addr = vms[0]->addr - pcpu_group_offsets[0];
|
||||
return chunk;
|
||||
}
|
||||
|
||||
static void pcpu_destroy_chunk(struct pcpu_chunk *chunk)
|
||||
{
|
||||
if (chunk && chunk->data)
|
||||
pcpu_free_vm_areas(chunk->data, pcpu_nr_groups);
|
||||
pcpu_free_chunk(chunk);
|
||||
}
|
||||
|
||||
static struct page *pcpu_addr_to_page(void *addr)
|
||||
{
|
||||
return vmalloc_to_page(addr);
|
||||
}
|
||||
|
||||
static int __init pcpu_verify_alloc_info(const struct pcpu_alloc_info *ai)
|
||||
{
|
||||
/* no extra restriction */
|
||||
return 0;
|
||||
}
|
||||
597
mm/percpu.c
597
mm/percpu.c
@ -1,5 +1,5 @@
|
||||
/*
|
||||
* linux/mm/percpu.c - percpu memory allocator
|
||||
* mm/percpu.c - percpu memory allocator
|
||||
*
|
||||
* Copyright (C) 2009 SUSE Linux Products GmbH
|
||||
* Copyright (C) 2009 Tejun Heo <tj@kernel.org>
|
||||
@ -7,14 +7,13 @@
|
||||
* This file is released under the GPLv2.
|
||||
*
|
||||
* This is percpu allocator which can handle both static and dynamic
|
||||
* areas. Percpu areas are allocated in chunks in vmalloc area. Each
|
||||
* chunk is consisted of boot-time determined number of units and the
|
||||
* first chunk is used for static percpu variables in the kernel image
|
||||
* areas. Percpu areas are allocated in chunks. Each chunk is
|
||||
* consisted of boot-time determined number of units and the first
|
||||
* chunk is used for static percpu variables in the kernel image
|
||||
* (special boot time alloc/init handling necessary as these areas
|
||||
* need to be brought up before allocation services are running).
|
||||
* Unit grows as necessary and all units grow or shrink in unison.
|
||||
* When a chunk is filled up, another chunk is allocated. ie. in
|
||||
* vmalloc area
|
||||
* When a chunk is filled up, another chunk is allocated.
|
||||
*
|
||||
* c0 c1 c2
|
||||
* ------------------- ------------------- ------------
|
||||
@ -99,7 +98,7 @@ struct pcpu_chunk {
|
||||
int map_used; /* # of map entries used */
|
||||
int map_alloc; /* # of map entries allocated */
|
||||
int *map; /* allocation map */
|
||||
struct vm_struct **vms; /* mapped vmalloc regions */
|
||||
void *data; /* chunk data */
|
||||
bool immutable; /* no [de]population allowed */
|
||||
unsigned long populated[]; /* populated bitmap */
|
||||
};
|
||||
@ -177,6 +176,21 @@ static struct list_head *pcpu_slot __read_mostly; /* chunk list slots */
|
||||
static void pcpu_reclaim(struct work_struct *work);
|
||||
static DECLARE_WORK(pcpu_reclaim_work, pcpu_reclaim);
|
||||
|
||||
static bool pcpu_addr_in_first_chunk(void *addr)
|
||||
{
|
||||
void *first_start = pcpu_first_chunk->base_addr;
|
||||
|
||||
return addr >= first_start && addr < first_start + pcpu_unit_size;
|
||||
}
|
||||
|
||||
static bool pcpu_addr_in_reserved_chunk(void *addr)
|
||||
{
|
||||
void *first_start = pcpu_first_chunk->base_addr;
|
||||
|
||||
return addr >= first_start &&
|
||||
addr < first_start + pcpu_reserved_chunk_limit;
|
||||
}
|
||||
|
||||
static int __pcpu_size_to_slot(int size)
|
||||
{
|
||||
int highbit = fls(size); /* size is in bytes */
|
||||
@ -198,27 +212,6 @@ static int pcpu_chunk_slot(const struct pcpu_chunk *chunk)
|
||||
return pcpu_size_to_slot(chunk->free_size);
|
||||
}
|
||||
|
||||
static int pcpu_page_idx(unsigned int cpu, int page_idx)
|
||||
{
|
||||
return pcpu_unit_map[cpu] * pcpu_unit_pages + page_idx;
|
||||
}
|
||||
|
||||
static unsigned long pcpu_chunk_addr(struct pcpu_chunk *chunk,
|
||||
unsigned int cpu, int page_idx)
|
||||
{
|
||||
return (unsigned long)chunk->base_addr + pcpu_unit_offsets[cpu] +
|
||||
(page_idx << PAGE_SHIFT);
|
||||
}
|
||||
|
||||
static struct page *pcpu_chunk_page(struct pcpu_chunk *chunk,
|
||||
unsigned int cpu, int page_idx)
|
||||
{
|
||||
/* must not be used on pre-mapped chunk */
|
||||
WARN_ON(chunk->immutable);
|
||||
|
||||
return vmalloc_to_page((void *)pcpu_chunk_addr(chunk, cpu, page_idx));
|
||||
}
|
||||
|
||||
/* set the pointer to a chunk in a page struct */
|
||||
static void pcpu_set_page_chunk(struct page *page, struct pcpu_chunk *pcpu)
|
||||
{
|
||||
@ -231,13 +224,27 @@ static struct pcpu_chunk *pcpu_get_page_chunk(struct page *page)
|
||||
return (struct pcpu_chunk *)page->index;
|
||||
}
|
||||
|
||||
static void pcpu_next_unpop(struct pcpu_chunk *chunk, int *rs, int *re, int end)
|
||||
static int __maybe_unused pcpu_page_idx(unsigned int cpu, int page_idx)
|
||||
{
|
||||
return pcpu_unit_map[cpu] * pcpu_unit_pages + page_idx;
|
||||
}
|
||||
|
||||
static unsigned long __maybe_unused pcpu_chunk_addr(struct pcpu_chunk *chunk,
|
||||
unsigned int cpu, int page_idx)
|
||||
{
|
||||
return (unsigned long)chunk->base_addr + pcpu_unit_offsets[cpu] +
|
||||
(page_idx << PAGE_SHIFT);
|
||||
}
|
||||
|
||||
static void __maybe_unused pcpu_next_unpop(struct pcpu_chunk *chunk,
|
||||
int *rs, int *re, int end)
|
||||
{
|
||||
*rs = find_next_zero_bit(chunk->populated, end, *rs);
|
||||
*re = find_next_bit(chunk->populated, end, *rs + 1);
|
||||
}
|
||||
|
||||
static void pcpu_next_pop(struct pcpu_chunk *chunk, int *rs, int *re, int end)
|
||||
static void __maybe_unused pcpu_next_pop(struct pcpu_chunk *chunk,
|
||||
int *rs, int *re, int end)
|
||||
{
|
||||
*rs = find_next_bit(chunk->populated, end, *rs);
|
||||
*re = find_next_zero_bit(chunk->populated, end, *rs + 1);
|
||||
@ -325,36 +332,6 @@ static void pcpu_chunk_relocate(struct pcpu_chunk *chunk, int oslot)
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_chunk_addr_search - determine chunk containing specified address
|
||||
* @addr: address for which the chunk needs to be determined.
|
||||
*
|
||||
* RETURNS:
|
||||
* The address of the found chunk.
|
||||
*/
|
||||
static struct pcpu_chunk *pcpu_chunk_addr_search(void *addr)
|
||||
{
|
||||
void *first_start = pcpu_first_chunk->base_addr;
|
||||
|
||||
/* is it in the first chunk? */
|
||||
if (addr >= first_start && addr < first_start + pcpu_unit_size) {
|
||||
/* is it in the reserved area? */
|
||||
if (addr < first_start + pcpu_reserved_chunk_limit)
|
||||
return pcpu_reserved_chunk;
|
||||
return pcpu_first_chunk;
|
||||
}
|
||||
|
||||
/*
|
||||
* The address is relative to unit0 which might be unused and
|
||||
* thus unmapped. Offset the address to the unit space of the
|
||||
* current processor before looking it up in the vmalloc
|
||||
* space. Note that any possible cpu id can be used here, so
|
||||
* there's no need to worry about preemption or cpu hotplug.
|
||||
*/
|
||||
addr += pcpu_unit_offsets[raw_smp_processor_id()];
|
||||
return pcpu_get_page_chunk(vmalloc_to_page(addr));
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_need_to_extend - determine whether chunk area map needs to be extended
|
||||
* @chunk: chunk of interest
|
||||
@ -623,409 +600,7 @@ static void pcpu_free_area(struct pcpu_chunk *chunk, int freeme)
|
||||
pcpu_chunk_relocate(chunk, oslot);
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_get_pages_and_bitmap - get temp pages array and bitmap
|
||||
* @chunk: chunk of interest
|
||||
* @bitmapp: output parameter for bitmap
|
||||
* @may_alloc: may allocate the array
|
||||
*
|
||||
* Returns pointer to array of pointers to struct page and bitmap,
|
||||
* both of which can be indexed with pcpu_page_idx(). The returned
|
||||
* array is cleared to zero and *@bitmapp is copied from
|
||||
* @chunk->populated. Note that there is only one array and bitmap
|
||||
* and access exclusion is the caller's responsibility.
|
||||
*
|
||||
* CONTEXT:
|
||||
* pcpu_alloc_mutex and does GFP_KERNEL allocation if @may_alloc.
|
||||
* Otherwise, don't care.
|
||||
*
|
||||
* RETURNS:
|
||||
* Pointer to temp pages array on success, NULL on failure.
|
||||
*/
|
||||
static struct page **pcpu_get_pages_and_bitmap(struct pcpu_chunk *chunk,
|
||||
unsigned long **bitmapp,
|
||||
bool may_alloc)
|
||||
{
|
||||
static struct page **pages;
|
||||
static unsigned long *bitmap;
|
||||
size_t pages_size = pcpu_nr_units * pcpu_unit_pages * sizeof(pages[0]);
|
||||
size_t bitmap_size = BITS_TO_LONGS(pcpu_unit_pages) *
|
||||
sizeof(unsigned long);
|
||||
|
||||
if (!pages || !bitmap) {
|
||||
if (may_alloc && !pages)
|
||||
pages = pcpu_mem_alloc(pages_size);
|
||||
if (may_alloc && !bitmap)
|
||||
bitmap = pcpu_mem_alloc(bitmap_size);
|
||||
if (!pages || !bitmap)
|
||||
return NULL;
|
||||
}
|
||||
|
||||
memset(pages, 0, pages_size);
|
||||
bitmap_copy(bitmap, chunk->populated, pcpu_unit_pages);
|
||||
|
||||
*bitmapp = bitmap;
|
||||
return pages;
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_free_pages - free pages which were allocated for @chunk
|
||||
* @chunk: chunk pages were allocated for
|
||||
* @pages: array of pages to be freed, indexed by pcpu_page_idx()
|
||||
* @populated: populated bitmap
|
||||
* @page_start: page index of the first page to be freed
|
||||
* @page_end: page index of the last page to be freed + 1
|
||||
*
|
||||
* Free pages [@page_start and @page_end) in @pages for all units.
|
||||
* The pages were allocated for @chunk.
|
||||
*/
|
||||
static void pcpu_free_pages(struct pcpu_chunk *chunk,
|
||||
struct page **pages, unsigned long *populated,
|
||||
int page_start, int page_end)
|
||||
{
|
||||
unsigned int cpu;
|
||||
int i;
|
||||
|
||||
for_each_possible_cpu(cpu) {
|
||||
for (i = page_start; i < page_end; i++) {
|
||||
struct page *page = pages[pcpu_page_idx(cpu, i)];
|
||||
|
||||
if (page)
|
||||
__free_page(page);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_alloc_pages - allocates pages for @chunk
|
||||
* @chunk: target chunk
|
||||
* @pages: array to put the allocated pages into, indexed by pcpu_page_idx()
|
||||
* @populated: populated bitmap
|
||||
* @page_start: page index of the first page to be allocated
|
||||
* @page_end: page index of the last page to be allocated + 1
|
||||
*
|
||||
* Allocate pages [@page_start,@page_end) into @pages for all units.
|
||||
* The allocation is for @chunk. Percpu core doesn't care about the
|
||||
* content of @pages and will pass it verbatim to pcpu_map_pages().
|
||||
*/
|
||||
static int pcpu_alloc_pages(struct pcpu_chunk *chunk,
|
||||
struct page **pages, unsigned long *populated,
|
||||
int page_start, int page_end)
|
||||
{
|
||||
const gfp_t gfp = GFP_KERNEL | __GFP_HIGHMEM | __GFP_COLD;
|
||||
unsigned int cpu;
|
||||
int i;
|
||||
|
||||
for_each_possible_cpu(cpu) {
|
||||
for (i = page_start; i < page_end; i++) {
|
||||
struct page **pagep = &pages[pcpu_page_idx(cpu, i)];
|
||||
|
||||
*pagep = alloc_pages_node(cpu_to_node(cpu), gfp, 0);
|
||||
if (!*pagep) {
|
||||
pcpu_free_pages(chunk, pages, populated,
|
||||
page_start, page_end);
|
||||
return -ENOMEM;
|
||||
}
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_pre_unmap_flush - flush cache prior to unmapping
|
||||
* @chunk: chunk the regions to be flushed belongs to
|
||||
* @page_start: page index of the first page to be flushed
|
||||
* @page_end: page index of the last page to be flushed + 1
|
||||
*
|
||||
* Pages in [@page_start,@page_end) of @chunk are about to be
|
||||
* unmapped. Flush cache. As each flushing trial can be very
|
||||
* expensive, issue flush on the whole region at once rather than
|
||||
* doing it for each cpu. This could be an overkill but is more
|
||||
* scalable.
|
||||
*/
|
||||
static void pcpu_pre_unmap_flush(struct pcpu_chunk *chunk,
|
||||
int page_start, int page_end)
|
||||
{
|
||||
flush_cache_vunmap(
|
||||
pcpu_chunk_addr(chunk, pcpu_first_unit_cpu, page_start),
|
||||
pcpu_chunk_addr(chunk, pcpu_last_unit_cpu, page_end));
|
||||
}
|
||||
|
||||
static void __pcpu_unmap_pages(unsigned long addr, int nr_pages)
|
||||
{
|
||||
unmap_kernel_range_noflush(addr, nr_pages << PAGE_SHIFT);
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_unmap_pages - unmap pages out of a pcpu_chunk
|
||||
* @chunk: chunk of interest
|
||||
* @pages: pages array which can be used to pass information to free
|
||||
* @populated: populated bitmap
|
||||
* @page_start: page index of the first page to unmap
|
||||
* @page_end: page index of the last page to unmap + 1
|
||||
*
|
||||
* For each cpu, unmap pages [@page_start,@page_end) out of @chunk.
|
||||
* Corresponding elements in @pages were cleared by the caller and can
|
||||
* be used to carry information to pcpu_free_pages() which will be
|
||||
* called after all unmaps are finished. The caller should call
|
||||
* proper pre/post flush functions.
|
||||
*/
|
||||
static void pcpu_unmap_pages(struct pcpu_chunk *chunk,
|
||||
struct page **pages, unsigned long *populated,
|
||||
int page_start, int page_end)
|
||||
{
|
||||
unsigned int cpu;
|
||||
int i;
|
||||
|
||||
for_each_possible_cpu(cpu) {
|
||||
for (i = page_start; i < page_end; i++) {
|
||||
struct page *page;
|
||||
|
||||
page = pcpu_chunk_page(chunk, cpu, i);
|
||||
WARN_ON(!page);
|
||||
pages[pcpu_page_idx(cpu, i)] = page;
|
||||
}
|
||||
__pcpu_unmap_pages(pcpu_chunk_addr(chunk, cpu, page_start),
|
||||
page_end - page_start);
|
||||
}
|
||||
|
||||
for (i = page_start; i < page_end; i++)
|
||||
__clear_bit(i, populated);
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_post_unmap_tlb_flush - flush TLB after unmapping
|
||||
* @chunk: pcpu_chunk the regions to be flushed belong to
|
||||
* @page_start: page index of the first page to be flushed
|
||||
* @page_end: page index of the last page to be flushed + 1
|
||||
*
|
||||
* Pages [@page_start,@page_end) of @chunk have been unmapped. Flush
|
||||
* TLB for the regions. This can be skipped if the area is to be
|
||||
* returned to vmalloc as vmalloc will handle TLB flushing lazily.
|
||||
*
|
||||
* As with pcpu_pre_unmap_flush(), TLB flushing also is done at once
|
||||
* for the whole region.
|
||||
*/
|
||||
static void pcpu_post_unmap_tlb_flush(struct pcpu_chunk *chunk,
|
||||
int page_start, int page_end)
|
||||
{
|
||||
flush_tlb_kernel_range(
|
||||
pcpu_chunk_addr(chunk, pcpu_first_unit_cpu, page_start),
|
||||
pcpu_chunk_addr(chunk, pcpu_last_unit_cpu, page_end));
|
||||
}
|
||||
|
||||
static int __pcpu_map_pages(unsigned long addr, struct page **pages,
|
||||
int nr_pages)
|
||||
{
|
||||
return map_kernel_range_noflush(addr, nr_pages << PAGE_SHIFT,
|
||||
PAGE_KERNEL, pages);
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_map_pages - map pages into a pcpu_chunk
|
||||
* @chunk: chunk of interest
|
||||
* @pages: pages array containing pages to be mapped
|
||||
* @populated: populated bitmap
|
||||
* @page_start: page index of the first page to map
|
||||
* @page_end: page index of the last page to map + 1
|
||||
*
|
||||
* For each cpu, map pages [@page_start,@page_end) into @chunk. The
|
||||
* caller is responsible for calling pcpu_post_map_flush() after all
|
||||
* mappings are complete.
|
||||
*
|
||||
* This function is responsible for setting corresponding bits in
|
||||
* @chunk->populated bitmap and whatever is necessary for reverse
|
||||
* lookup (addr -> chunk).
|
||||
*/
|
||||
static int pcpu_map_pages(struct pcpu_chunk *chunk,
|
||||
struct page **pages, unsigned long *populated,
|
||||
int page_start, int page_end)
|
||||
{
|
||||
unsigned int cpu, tcpu;
|
||||
int i, err;
|
||||
|
||||
for_each_possible_cpu(cpu) {
|
||||
err = __pcpu_map_pages(pcpu_chunk_addr(chunk, cpu, page_start),
|
||||
&pages[pcpu_page_idx(cpu, page_start)],
|
||||
page_end - page_start);
|
||||
if (err < 0)
|
||||
goto err;
|
||||
}
|
||||
|
||||
/* mapping successful, link chunk and mark populated */
|
||||
for (i = page_start; i < page_end; i++) {
|
||||
for_each_possible_cpu(cpu)
|
||||
pcpu_set_page_chunk(pages[pcpu_page_idx(cpu, i)],
|
||||
chunk);
|
||||
__set_bit(i, populated);
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
err:
|
||||
for_each_possible_cpu(tcpu) {
|
||||
if (tcpu == cpu)
|
||||
break;
|
||||
__pcpu_unmap_pages(pcpu_chunk_addr(chunk, tcpu, page_start),
|
||||
page_end - page_start);
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_post_map_flush - flush cache after mapping
|
||||
* @chunk: pcpu_chunk the regions to be flushed belong to
|
||||
* @page_start: page index of the first page to be flushed
|
||||
* @page_end: page index of the last page to be flushed + 1
|
||||
*
|
||||
* Pages [@page_start,@page_end) of @chunk have been mapped. Flush
|
||||
* cache.
|
||||
*
|
||||
* As with pcpu_pre_unmap_flush(), TLB flushing also is done at once
|
||||
* for the whole region.
|
||||
*/
|
||||
static void pcpu_post_map_flush(struct pcpu_chunk *chunk,
|
||||
int page_start, int page_end)
|
||||
{
|
||||
flush_cache_vmap(
|
||||
pcpu_chunk_addr(chunk, pcpu_first_unit_cpu, page_start),
|
||||
pcpu_chunk_addr(chunk, pcpu_last_unit_cpu, page_end));
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_depopulate_chunk - depopulate and unmap an area of a pcpu_chunk
|
||||
* @chunk: chunk to depopulate
|
||||
* @off: offset to the area to depopulate
|
||||
* @size: size of the area to depopulate in bytes
|
||||
* @flush: whether to flush cache and tlb or not
|
||||
*
|
||||
* For each cpu, depopulate and unmap pages [@page_start,@page_end)
|
||||
* from @chunk. If @flush is true, vcache is flushed before unmapping
|
||||
* and tlb after.
|
||||
*
|
||||
* CONTEXT:
|
||||
* pcpu_alloc_mutex.
|
||||
*/
|
||||
static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk, int off, int size)
|
||||
{
|
||||
int page_start = PFN_DOWN(off);
|
||||
int page_end = PFN_UP(off + size);
|
||||
struct page **pages;
|
||||
unsigned long *populated;
|
||||
int rs, re;
|
||||
|
||||
/* quick path, check whether it's empty already */
|
||||
rs = page_start;
|
||||
pcpu_next_unpop(chunk, &rs, &re, page_end);
|
||||
if (rs == page_start && re == page_end)
|
||||
return;
|
||||
|
||||
/* immutable chunks can't be depopulated */
|
||||
WARN_ON(chunk->immutable);
|
||||
|
||||
/*
|
||||
* If control reaches here, there must have been at least one
|
||||
* successful population attempt so the temp pages array must
|
||||
* be available now.
|
||||
*/
|
||||
pages = pcpu_get_pages_and_bitmap(chunk, &populated, false);
|
||||
BUG_ON(!pages);
|
||||
|
||||
/* unmap and free */
|
||||
pcpu_pre_unmap_flush(chunk, page_start, page_end);
|
||||
|
||||
pcpu_for_each_pop_region(chunk, rs, re, page_start, page_end)
|
||||
pcpu_unmap_pages(chunk, pages, populated, rs, re);
|
||||
|
||||
/* no need to flush tlb, vmalloc will handle it lazily */
|
||||
|
||||
pcpu_for_each_pop_region(chunk, rs, re, page_start, page_end)
|
||||
pcpu_free_pages(chunk, pages, populated, rs, re);
|
||||
|
||||
/* commit new bitmap */
|
||||
bitmap_copy(chunk->populated, populated, pcpu_unit_pages);
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_populate_chunk - populate and map an area of a pcpu_chunk
|
||||
* @chunk: chunk of interest
|
||||
* @off: offset to the area to populate
|
||||
* @size: size of the area to populate in bytes
|
||||
*
|
||||
* For each cpu, populate and map pages [@page_start,@page_end) into
|
||||
* @chunk. The area is cleared on return.
|
||||
*
|
||||
* CONTEXT:
|
||||
* pcpu_alloc_mutex, does GFP_KERNEL allocation.
|
||||
*/
|
||||
static int pcpu_populate_chunk(struct pcpu_chunk *chunk, int off, int size)
|
||||
{
|
||||
int page_start = PFN_DOWN(off);
|
||||
int page_end = PFN_UP(off + size);
|
||||
int free_end = page_start, unmap_end = page_start;
|
||||
struct page **pages;
|
||||
unsigned long *populated;
|
||||
unsigned int cpu;
|
||||
int rs, re, rc;
|
||||
|
||||
/* quick path, check whether all pages are already there */
|
||||
rs = page_start;
|
||||
pcpu_next_pop(chunk, &rs, &re, page_end);
|
||||
if (rs == page_start && re == page_end)
|
||||
goto clear;
|
||||
|
||||
/* need to allocate and map pages, this chunk can't be immutable */
|
||||
WARN_ON(chunk->immutable);
|
||||
|
||||
pages = pcpu_get_pages_and_bitmap(chunk, &populated, true);
|
||||
if (!pages)
|
||||
return -ENOMEM;
|
||||
|
||||
/* alloc and map */
|
||||
pcpu_for_each_unpop_region(chunk, rs, re, page_start, page_end) {
|
||||
rc = pcpu_alloc_pages(chunk, pages, populated, rs, re);
|
||||
if (rc)
|
||||
goto err_free;
|
||||
free_end = re;
|
||||
}
|
||||
|
||||
pcpu_for_each_unpop_region(chunk, rs, re, page_start, page_end) {
|
||||
rc = pcpu_map_pages(chunk, pages, populated, rs, re);
|
||||
if (rc)
|
||||
goto err_unmap;
|
||||
unmap_end = re;
|
||||
}
|
||||
pcpu_post_map_flush(chunk, page_start, page_end);
|
||||
|
||||
/* commit new bitmap */
|
||||
bitmap_copy(chunk->populated, populated, pcpu_unit_pages);
|
||||
clear:
|
||||
for_each_possible_cpu(cpu)
|
||||
memset((void *)pcpu_chunk_addr(chunk, cpu, 0) + off, 0, size);
|
||||
return 0;
|
||||
|
||||
err_unmap:
|
||||
pcpu_pre_unmap_flush(chunk, page_start, unmap_end);
|
||||
pcpu_for_each_unpop_region(chunk, rs, re, page_start, unmap_end)
|
||||
pcpu_unmap_pages(chunk, pages, populated, rs, re);
|
||||
pcpu_post_unmap_tlb_flush(chunk, page_start, unmap_end);
|
||||
err_free:
|
||||
pcpu_for_each_unpop_region(chunk, rs, re, page_start, free_end)
|
||||
pcpu_free_pages(chunk, pages, populated, rs, re);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static void free_pcpu_chunk(struct pcpu_chunk *chunk)
|
||||
{
|
||||
if (!chunk)
|
||||
return;
|
||||
if (chunk->vms)
|
||||
pcpu_free_vm_areas(chunk->vms, pcpu_nr_groups);
|
||||
pcpu_mem_free(chunk->map, chunk->map_alloc * sizeof(chunk->map[0]));
|
||||
kfree(chunk);
|
||||
}
|
||||
|
||||
static struct pcpu_chunk *alloc_pcpu_chunk(void)
|
||||
static struct pcpu_chunk *pcpu_alloc_chunk(void)
|
||||
{
|
||||
struct pcpu_chunk *chunk;
|
||||
|
||||
@ -1034,25 +609,85 @@ static struct pcpu_chunk *alloc_pcpu_chunk(void)
|
||||
return NULL;
|
||||
|
||||
chunk->map = pcpu_mem_alloc(PCPU_DFL_MAP_ALLOC * sizeof(chunk->map[0]));
|
||||
chunk->map_alloc = PCPU_DFL_MAP_ALLOC;
|
||||
chunk->map[chunk->map_used++] = pcpu_unit_size;
|
||||
|
||||
chunk->vms = pcpu_get_vm_areas(pcpu_group_offsets, pcpu_group_sizes,
|
||||
pcpu_nr_groups, pcpu_atom_size,
|
||||
GFP_KERNEL);
|
||||
if (!chunk->vms) {
|
||||
free_pcpu_chunk(chunk);
|
||||
if (!chunk->map) {
|
||||
kfree(chunk);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
chunk->map_alloc = PCPU_DFL_MAP_ALLOC;
|
||||
chunk->map[chunk->map_used++] = pcpu_unit_size;
|
||||
|
||||
INIT_LIST_HEAD(&chunk->list);
|
||||
chunk->free_size = pcpu_unit_size;
|
||||
chunk->contig_hint = pcpu_unit_size;
|
||||
chunk->base_addr = chunk->vms[0]->addr - pcpu_group_offsets[0];
|
||||
|
||||
return chunk;
|
||||
}
|
||||
|
||||
static void pcpu_free_chunk(struct pcpu_chunk *chunk)
|
||||
{
|
||||
if (!chunk)
|
||||
return;
|
||||
pcpu_mem_free(chunk->map, chunk->map_alloc * sizeof(chunk->map[0]));
|
||||
kfree(chunk);
|
||||
}
|
||||
|
||||
/*
|
||||
* Chunk management implementation.
|
||||
*
|
||||
* To allow different implementations, chunk alloc/free and
|
||||
* [de]population are implemented in a separate file which is pulled
|
||||
* into this file and compiled together. The following functions
|
||||
* should be implemented.
|
||||
*
|
||||
* pcpu_populate_chunk - populate the specified range of a chunk
|
||||
* pcpu_depopulate_chunk - depopulate the specified range of a chunk
|
||||
* pcpu_create_chunk - create a new chunk
|
||||
* pcpu_destroy_chunk - destroy a chunk, always preceded by full depop
|
||||
* pcpu_addr_to_page - translate address to physical address
|
||||
* pcpu_verify_alloc_info - check alloc_info is acceptable during init
|
||||
*/
|
||||
static int pcpu_populate_chunk(struct pcpu_chunk *chunk, int off, int size);
|
||||
static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk, int off, int size);
|
||||
static struct pcpu_chunk *pcpu_create_chunk(void);
|
||||
static void pcpu_destroy_chunk(struct pcpu_chunk *chunk);
|
||||
static struct page *pcpu_addr_to_page(void *addr);
|
||||
static int __init pcpu_verify_alloc_info(const struct pcpu_alloc_info *ai);
|
||||
|
||||
#ifdef CONFIG_NEED_PER_CPU_KM
|
||||
#include "percpu-km.c"
|
||||
#else
|
||||
#include "percpu-vm.c"
|
||||
#endif
|
||||
|
||||
/**
|
||||
* pcpu_chunk_addr_search - determine chunk containing specified address
|
||||
* @addr: address for which the chunk needs to be determined.
|
||||
*
|
||||
* RETURNS:
|
||||
* The address of the found chunk.
|
||||
*/
|
||||
static struct pcpu_chunk *pcpu_chunk_addr_search(void *addr)
|
||||
{
|
||||
/* is it in the first chunk? */
|
||||
if (pcpu_addr_in_first_chunk(addr)) {
|
||||
/* is it in the reserved area? */
|
||||
if (pcpu_addr_in_reserved_chunk(addr))
|
||||
return pcpu_reserved_chunk;
|
||||
return pcpu_first_chunk;
|
||||
}
|
||||
|
||||
/*
|
||||
* The address is relative to unit0 which might be unused and
|
||||
* thus unmapped. Offset the address to the unit space of the
|
||||
* current processor before looking it up in the vmalloc
|
||||
* space. Note that any possible cpu id can be used here, so
|
||||
* there's no need to worry about preemption or cpu hotplug.
|
||||
*/
|
||||
addr += pcpu_unit_offsets[raw_smp_processor_id()];
|
||||
return pcpu_get_page_chunk(pcpu_addr_to_page(addr));
|
||||
}
|
||||
|
||||
/**
|
||||
* pcpu_alloc - the percpu allocator
|
||||
* @size: size of area to allocate in bytes
|
||||
@ -1142,7 +777,7 @@ static void __percpu *pcpu_alloc(size_t size, size_t align, bool reserved)
|
||||
/* hmmm... no space left, create a new chunk */
|
||||
spin_unlock_irqrestore(&pcpu_lock, flags);
|
||||
|
||||
chunk = alloc_pcpu_chunk();
|
||||
chunk = pcpu_create_chunk();
|
||||
if (!chunk) {
|
||||
err = "failed to allocate new chunk";
|
||||
goto fail_unlock_mutex;
|
||||
@ -1254,7 +889,7 @@ static void pcpu_reclaim(struct work_struct *work)
|
||||
|
||||
list_for_each_entry_safe(chunk, next, &todo, list) {
|
||||
pcpu_depopulate_chunk(chunk, 0, pcpu_unit_size);
|
||||
free_pcpu_chunk(chunk);
|
||||
pcpu_destroy_chunk(chunk);
|
||||
}
|
||||
|
||||
mutex_unlock(&pcpu_alloc_mutex);
|
||||
@ -1343,11 +978,14 @@ bool is_kernel_percpu_address(unsigned long addr)
|
||||
*/
|
||||
phys_addr_t per_cpu_ptr_to_phys(void *addr)
|
||||
{
|
||||
if ((unsigned long)addr < VMALLOC_START ||
|
||||
(unsigned long)addr >= VMALLOC_END)
|
||||
return __pa(addr);
|
||||
else
|
||||
return page_to_phys(vmalloc_to_page(addr));
|
||||
if (pcpu_addr_in_first_chunk(addr)) {
|
||||
if ((unsigned long)addr < VMALLOC_START ||
|
||||
(unsigned long)addr >= VMALLOC_END)
|
||||
return __pa(addr);
|
||||
else
|
||||
return page_to_phys(vmalloc_to_page(addr));
|
||||
} else
|
||||
return page_to_phys(pcpu_addr_to_page(addr));
|
||||
}
|
||||
|
||||
static inline size_t pcpu_calc_fc_sizes(size_t static_size,
|
||||
@ -1719,6 +1357,7 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
|
||||
PCPU_SETUP_BUG_ON(ai->unit_size < size_sum);
|
||||
PCPU_SETUP_BUG_ON(ai->unit_size & ~PAGE_MASK);
|
||||
PCPU_SETUP_BUG_ON(ai->unit_size < PCPU_MIN_UNIT_SIZE);
|
||||
PCPU_SETUP_BUG_ON(pcpu_verify_alloc_info(ai) < 0);
|
||||
|
||||
/* process group information and build config tables accordingly */
|
||||
group_offsets = alloc_bootmem(ai->nr_groups * sizeof(group_offsets[0]));
|
||||
|
||||
Loading…
Reference in New Issue
Block a user