int map_alloc; /* # of map entries allocated */
int *map; /* allocation map */
bool immutable; /* no [de]population allowed */
- struct page **page; /* points to page array */
- struct page *page_ar[]; /* #cpus * UNIT_PAGES */
+ unsigned long populated[]; /* populated bitmap */
};
static int pcpu_unit_pages __read_mostly;
* Synchronization rules.
*
* There are two locks - pcpu_alloc_mutex and pcpu_lock. The former
- * protects allocation/reclaim paths, chunks and chunk->page arrays.
- * The latter is a spinlock and protects the index data structures -
- * chunk slots, chunks and area maps in chunks.
+ * protects allocation/reclaim paths, chunks, populated bitmap and
+ * vmalloc mapping. The latter is a spinlock and protects the index
+ * data structures - chunk slots, chunks and area maps in chunks.
*
* During allocation, pcpu_alloc_mutex is kept locked all the time and
* pcpu_lock is grabbed and released as necessary. All actual memory
(pcpu_page_idx(cpu, page_idx) << PAGE_SHIFT);
}
-static struct page **pcpu_chunk_pagep(struct pcpu_chunk *chunk,
- unsigned int cpu, int page_idx)
+static struct page *pcpu_chunk_page(struct pcpu_chunk *chunk,
+ unsigned int cpu, int page_idx)
{
- return &chunk->page[pcpu_page_idx(cpu, page_idx)];
-}
+ /* must not be used on pre-mapped chunk */
+ WARN_ON(chunk->immutable);
-static bool pcpu_chunk_page_occupied(struct pcpu_chunk *chunk,
- int page_idx)
-{
- return *pcpu_chunk_pagep(chunk, 0, page_idx) != NULL;
+ return vmalloc_to_page((void *)pcpu_chunk_addr(chunk, cpu, page_idx));
}
/* set the pointer to a chunk in a page struct */
return (struct pcpu_chunk *)page->index;
}
+static void 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)
+{
+ *rs = find_next_bit(chunk->populated, end, *rs);
+ *re = find_next_zero_bit(chunk->populated, end, *rs + 1);
+}
+
+/*
+ * (Un)populated page region iterators. Iterate over (un)populated
+ * page regions betwen @start and @end in @chunk. @rs and @re should
+ * be integer variables and will be set to start and end page index of
+ * the current region.
+ */
+#define pcpu_for_each_unpop_region(chunk, rs, re, start, end) \
+ for ((rs) = (start), pcpu_next_unpop((chunk), &(rs), &(re), (end)); \
+ (rs) < (re); \
+ (rs) = (re) + 1, pcpu_next_unpop((chunk), &(rs), &(re), (end)))
+
+#define pcpu_for_each_pop_region(chunk, rs, re, start, end) \
+ for ((rs) = (start), pcpu_next_pop((chunk), &(rs), &(re), (end)); \
+ (rs) < (re); \
+ (rs) = (re) + 1, pcpu_next_pop((chunk), &(rs), &(re), (end)))
+
/**
* pcpu_mem_alloc - allocate memory
* @size: bytes to allocate
}
/**
- * pcpu_unmap - unmap pages out of a pcpu_chunk
+ * 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 = num_possible_cpus() * 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)
+{
+ unsigned int last = num_possible_cpus() - 1;
+
+ flush_cache_vunmap(pcpu_chunk_addr(chunk, 0, page_start),
+ pcpu_chunk_addr(chunk, last, 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
- * @flush_tlb: whether to flush tlb or not
*
* For each cpu, unmap pages [@page_start,@page_end) out of @chunk.
- * If @flush is true, vcache is flushed before unmapping and tlb
- * after.
+ * 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(struct pcpu_chunk *chunk, int page_start, int page_end,
- bool flush_tlb)
+static void pcpu_unmap_pages(struct pcpu_chunk *chunk,
+ struct page **pages, unsigned long *populated,
+ int page_start, int page_end)
{
- unsigned int last = num_possible_cpus() - 1;
unsigned int cpu;
+ int i;
- /* unmap must not be done on immutable chunk */
- WARN_ON(chunk->immutable);
+ for_each_possible_cpu(cpu) {
+ for (i = page_start; i < page_end; i++) {
+ struct page *page;
- /*
- * 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.
- */
- flush_cache_vunmap(pcpu_chunk_addr(chunk, 0, page_start),
- pcpu_chunk_addr(chunk, last, page_end));
+ 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_each_possible_cpu(cpu)
- unmap_kernel_range_noflush(
- pcpu_chunk_addr(chunk, cpu, page_start),
- (page_end - page_start) << PAGE_SHIFT);
-
- /* ditto as flush_cache_vunmap() */
- if (flush_tlb)
- flush_tlb_kernel_range(pcpu_chunk_addr(chunk, 0, page_start),
- pcpu_chunk_addr(chunk, last, page_end));
+ 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)
+{
+ unsigned int last = num_possible_cpus() - 1;
+
+ flush_tlb_kernel_range(pcpu_chunk_addr(chunk, 0, page_start),
+ pcpu_chunk_addr(chunk, last, page_end));
}
static int __pcpu_map_pages(unsigned long addr, struct page **pages,
}
/**
- * pcpu_map - map pages into a pcpu_chunk
+ * 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.
- * vcache is flushed afterwards.
+ * 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(struct pcpu_chunk *chunk, int page_start, int page_end)
+static int pcpu_map_pages(struct pcpu_chunk *chunk,
+ struct page **pages, unsigned long *populated,
+ int page_start, int page_end)
{
- unsigned int last = num_possible_cpus() - 1;
- unsigned int cpu;
- int err;
-
- /* map must not be done on immutable chunk */
- WARN_ON(chunk->immutable);
+ unsigned int cpu, tcpu;
+ int i, err;
for_each_possible_cpu(cpu) {
err = __pcpu_map_pages(pcpu_chunk_addr(chunk, cpu, page_start),
- pcpu_chunk_pagep(chunk, cpu, page_start),
+ &pages[pcpu_page_idx(cpu, page_start)],
page_end - page_start);
if (err < 0)
- return err;
+ 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)
+{
+ unsigned int last = num_possible_cpus() - 1;
+
/* flush at once, please read comments in pcpu_unmap() */
flush_cache_vmap(pcpu_chunk_addr(chunk, 0, page_start),
pcpu_chunk_addr(chunk, last, page_end));
- return 0;
}
/**
* CONTEXT:
* pcpu_alloc_mutex.
*/
-static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk, int off, int size,
- bool flush)
+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);
- int unmap_start = -1;
- int uninitialized_var(unmap_end);
- unsigned int cpu;
- int i;
+ struct page **pages;
+ unsigned long *populated;
+ int rs, re;
+
+ /* quick path, check whether it's empty already */
+ pcpu_for_each_unpop_region(chunk, rs, re, page_start, page_end) {
+ if (rs == page_start && re == page_end)
+ return;
+ break;
+ }
- for (i = page_start; i < page_end; i++) {
- for_each_possible_cpu(cpu) {
- struct page **pagep = pcpu_chunk_pagep(chunk, cpu, i);
+ /* immutable chunks can't be depopulated */
+ WARN_ON(chunk->immutable);
- if (!*pagep)
- continue;
+ /*
+ * 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);
- __free_page(*pagep);
+ /* unmap and free */
+ pcpu_pre_unmap_flush(chunk, page_start, page_end);
- /*
- * If it's partial depopulation, it might get
- * populated or depopulated again. Mark the
- * page gone.
- */
- *pagep = NULL;
+ pcpu_for_each_pop_region(chunk, rs, re, page_start, page_end)
+ pcpu_unmap_pages(chunk, pages, populated, rs, re);
- unmap_start = unmap_start < 0 ? i : unmap_start;
- unmap_end = i + 1;
- }
- }
+ /* 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);
- if (unmap_start >= 0)
- pcpu_unmap(chunk, unmap_start, unmap_end, flush);
+ /* commit new bitmap */
+ bitmap_copy(chunk->populated, populated, pcpu_unit_pages);
}
/**
*/
static int pcpu_populate_chunk(struct pcpu_chunk *chunk, int off, int size)
{
- const gfp_t alloc_mask = GFP_KERNEL | __GFP_HIGHMEM | __GFP_COLD;
int page_start = PFN_DOWN(off);
int page_end = PFN_UP(off + size);
- int map_start = -1;
- int uninitialized_var(map_end);
+ int free_end = page_start, unmap_end = page_start;
+ struct page **pages;
+ unsigned long *populated;
unsigned int cpu;
- int i;
+ int rs, re, rc;
- for (i = page_start; i < page_end; i++) {
- if (pcpu_chunk_page_occupied(chunk, i)) {
- if (map_start >= 0) {
- if (pcpu_map(chunk, map_start, map_end))
- goto err;
- map_start = -1;
- }
- continue;
- }
+ /* quick path, check whether all pages are already there */
+ pcpu_for_each_pop_region(chunk, rs, re, page_start, page_end) {
+ if (rs == page_start && re == page_end)
+ goto clear;
+ break;
+ }
- map_start = map_start < 0 ? i : map_start;
- map_end = i + 1;
+ /* need to allocate and map pages, this chunk can't be immutable */
+ WARN_ON(chunk->immutable);
- for_each_possible_cpu(cpu) {
- struct page **pagep = pcpu_chunk_pagep(chunk, cpu, i);
+ pages = pcpu_get_pages_and_bitmap(chunk, &populated, true);
+ if (!pages)
+ return -ENOMEM;
- *pagep = alloc_pages_node(cpu_to_node(cpu),
- alloc_mask, 0);
- if (!*pagep)
- goto err;
- pcpu_set_page_chunk(*pagep, chunk);
- }
+ /* 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;
}
- if (map_start >= 0 && pcpu_map(chunk, map_start, map_end))
- goto err;
+ 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(chunk->vm->addr + cpu * pcpu_unit_size + off, 0,
size);
-
return 0;
-err:
- /* likely under heavy memory pressure, give memory back */
- pcpu_depopulate_chunk(chunk, off, size, true);
- return -ENOMEM;
+
+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)
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->page = chunk->page_ar;
chunk->vm = get_vm_area(pcpu_chunk_size, GFP_KERNEL);
if (!chunk->vm) {
mutex_unlock(&pcpu_alloc_mutex);
list_for_each_entry_safe(chunk, next, &todo, list) {
- pcpu_depopulate_chunk(chunk, 0, pcpu_unit_size, false);
+ pcpu_depopulate_chunk(chunk, 0, pcpu_unit_size);
free_pcpu_chunk(chunk);
}
}
/**
* pcpu_setup_first_chunk - initialize the first percpu chunk
- * @get_page_fn: callback to fetch page pointer
* @static_size: the size of static percpu area in bytes
* @reserved_size: the size of reserved percpu area in bytes, 0 for none
* @dyn_size: free size for dynamic allocation in bytes, -1 for auto
* perpcu area. This function is to be called from arch percpu area
* setup path.
*
- * @get_page_fn() should return pointer to percpu page given cpu
- * number and page number. It should at least return enough pages to
- * cover the static area. The returned pages for static area should
- * have been initialized with valid data. It can also return pages
- * after the static area. NULL return indicates end of pages for the
- * cpu. Note that @get_page_fn() must return the same number of pages
- * for all cpus.
- *
* @reserved_size, if non-zero, specifies the amount of bytes to
* reserve after the static area in the first chunk. This reserves
* the first chunk such that it's available only through reserved
* The determined pcpu_unit_size which can be used to initialize
* percpu access.
*/
-size_t __init pcpu_setup_first_chunk(pcpu_get_page_fn_t get_page_fn,
- size_t static_size, size_t reserved_size,
+size_t __init pcpu_setup_first_chunk(size_t static_size, size_t reserved_size,
ssize_t dyn_size, size_t unit_size,
void *base_addr)
{
size_t size_sum = static_size + reserved_size +
(dyn_size >= 0 ? dyn_size : 0);
struct pcpu_chunk *schunk, *dchunk = NULL;
- unsigned int cpu;
- int i, nr_pages;
+ int i;
/* santiy checks */
BUILD_BUG_ON(ARRAY_SIZE(smap) >= PCPU_DFL_MAP_ALLOC ||
pcpu_unit_pages = unit_size >> PAGE_SHIFT;
pcpu_unit_size = pcpu_unit_pages << PAGE_SHIFT;
pcpu_chunk_size = num_possible_cpus() * pcpu_unit_size;
- pcpu_chunk_struct_size = sizeof(struct pcpu_chunk)
- + num_possible_cpus() * pcpu_unit_pages * sizeof(struct page *);
+ pcpu_chunk_struct_size = sizeof(struct pcpu_chunk) +
+ BITS_TO_LONGS(pcpu_unit_pages) * sizeof(unsigned long);
if (dyn_size < 0)
dyn_size = pcpu_unit_size - static_size - reserved_size;
schunk->vm = &first_vm;
schunk->map = smap;
schunk->map_alloc = ARRAY_SIZE(smap);
- schunk->page = schunk->page_ar;
schunk->immutable = true;
+ bitmap_fill(schunk->populated, pcpu_unit_pages);
if (reserved_size) {
schunk->free_size = reserved_size;
/* init dynamic chunk if necessary */
if (dyn_size) {
- dchunk = alloc_bootmem(sizeof(struct pcpu_chunk));
+ dchunk = alloc_bootmem(pcpu_chunk_struct_size);
INIT_LIST_HEAD(&dchunk->list);
dchunk->vm = &first_vm;
dchunk->map = dmap;
dchunk->map_alloc = ARRAY_SIZE(dmap);
- dchunk->page = schunk->page_ar; /* share page map with schunk */
dchunk->immutable = true;
+ bitmap_fill(dchunk->populated, pcpu_unit_pages);
dchunk->contig_hint = dchunk->free_size = dyn_size;
dchunk->map[dchunk->map_used++] = -pcpu_reserved_chunk_limit;
dchunk->map[dchunk->map_used++] = dchunk->free_size;
}
- /* assign pages */
- nr_pages = -1;
- for_each_possible_cpu(cpu) {
- for (i = 0; i < pcpu_unit_pages; i++) {
- struct page *page = get_page_fn(cpu, i);
-
- if (!page)
- break;
- *pcpu_chunk_pagep(schunk, cpu, i) = page;
- }
-
- BUG_ON(i < PFN_UP(static_size));
-
- if (nr_pages < 0)
- nr_pages = i;
- else
- BUG_ON(nr_pages != i);
- }
-
/* link the first chunk in */
pcpu_first_chunk = dchunk ?: schunk;
pcpu_chunk_relocate(pcpu_first_chunk, -1);
return size_sum;
}
-/*
- * Embedding first chunk setup helper.
- */
-static void *pcpue_ptr __initdata;
-static size_t pcpue_size __initdata;
-static size_t pcpue_unit_size __initdata;
-
-static struct page * __init pcpue_get_page(unsigned int cpu, int pageno)
-{
- size_t off = (size_t)pageno << PAGE_SHIFT;
-
- if (off >= pcpue_size)
- return NULL;
-
- return virt_to_page(pcpue_ptr + cpu * pcpue_unit_size + off);
-}
-
/**
* pcpu_embed_first_chunk - embed the first percpu chunk into bootmem
* @static_size: the size of static percpu area in bytes
ssize_t __init pcpu_embed_first_chunk(size_t static_size, size_t reserved_size,
ssize_t dyn_size)
{
- size_t chunk_size;
+ size_t size_sum, unit_size, chunk_size;
+ void *base;
unsigned int cpu;
/* determine parameters and allocate */
- pcpue_size = pcpu_calc_fc_sizes(static_size, reserved_size, &dyn_size);
+ size_sum = pcpu_calc_fc_sizes(static_size, reserved_size, &dyn_size);
- pcpue_unit_size = max_t(size_t, pcpue_size, PCPU_MIN_UNIT_SIZE);
- chunk_size = pcpue_unit_size * num_possible_cpus();
+ unit_size = max_t(size_t, size_sum, PCPU_MIN_UNIT_SIZE);
+ chunk_size = unit_size * num_possible_cpus();
- pcpue_ptr = __alloc_bootmem_nopanic(chunk_size, PAGE_SIZE,
- __pa(MAX_DMA_ADDRESS));
- if (!pcpue_ptr) {
+ base = __alloc_bootmem_nopanic(chunk_size, PAGE_SIZE,
+ __pa(MAX_DMA_ADDRESS));
+ if (!base) {
pr_warning("PERCPU: failed to allocate %zu bytes for "
"embedding\n", chunk_size);
return -ENOMEM;
/* return the leftover and copy */
for_each_possible_cpu(cpu) {
- void *ptr = pcpue_ptr + cpu * pcpue_unit_size;
+ void *ptr = base + cpu * unit_size;
- free_bootmem(__pa(ptr + pcpue_size),
- pcpue_unit_size - pcpue_size);
+ free_bootmem(__pa(ptr + size_sum), unit_size - size_sum);
memcpy(ptr, __per_cpu_load, static_size);
}
/* we're ready, commit */
pr_info("PERCPU: Embedded %zu pages at %p, static data %zu bytes\n",
- pcpue_size >> PAGE_SHIFT, pcpue_ptr, static_size);
+ size_sum >> PAGE_SHIFT, base, static_size);
- return pcpu_setup_first_chunk(pcpue_get_page, static_size,
- reserved_size, dyn_size,
- pcpue_unit_size, pcpue_ptr);
-}
-
-/*
- * 4k page first chunk setup helper.
- */
-static struct page **pcpu4k_pages __initdata;
-static int pcpu4k_unit_pages __initdata;
-
-static struct page * __init pcpu4k_get_page(unsigned int cpu, int pageno)
-{
- if (pageno < pcpu4k_unit_pages)
- return pcpu4k_pages[cpu * pcpu4k_unit_pages + pageno];
- return NULL;
+ return pcpu_setup_first_chunk(static_size, reserved_size, dyn_size,
+ unit_size, base);
}
/**
pcpu_fc_populate_pte_fn_t populate_pte_fn)
{
static struct vm_struct vm;
+ int unit_pages;
size_t pages_size;
+ struct page **pages;
unsigned int cpu;
int i, j;
ssize_t ret;
- pcpu4k_unit_pages = PFN_UP(max_t(size_t, static_size + reserved_size,
- PCPU_MIN_UNIT_SIZE));
+ unit_pages = PFN_UP(max_t(size_t, static_size + reserved_size,
+ PCPU_MIN_UNIT_SIZE));
/* unaligned allocations can't be freed, round up to page size */
- pages_size = PFN_ALIGN(pcpu4k_unit_pages * num_possible_cpus() *
- sizeof(pcpu4k_pages[0]));
- pcpu4k_pages = alloc_bootmem(pages_size);
+ pages_size = PFN_ALIGN(unit_pages * num_possible_cpus() *
+ sizeof(pages[0]));
+ pages = alloc_bootmem(pages_size);
/* allocate pages */
j = 0;
for_each_possible_cpu(cpu)
- for (i = 0; i < pcpu4k_unit_pages; i++) {
+ for (i = 0; i < unit_pages; i++) {
void *ptr;
ptr = alloc_fn(cpu, PAGE_SIZE);
"4k page for cpu%u\n", cpu);
goto enomem;
}
- pcpu4k_pages[j++] = virt_to_page(ptr);
+ pages[j++] = virt_to_page(ptr);
}
/* allocate vm area, map the pages and copy static data */
vm.flags = VM_ALLOC;
- vm.size = num_possible_cpus() * pcpu4k_unit_pages << PAGE_SHIFT;
+ vm.size = num_possible_cpus() * unit_pages << PAGE_SHIFT;
vm_area_register_early(&vm, PAGE_SIZE);
for_each_possible_cpu(cpu) {
unsigned long unit_addr = (unsigned long)vm.addr +
- (cpu * pcpu4k_unit_pages << PAGE_SHIFT);
+ (cpu * unit_pages << PAGE_SHIFT);
- for (i = 0; i < pcpu4k_unit_pages; i++)
+ for (i = 0; i < unit_pages; i++)
populate_pte_fn(unit_addr + (i << PAGE_SHIFT));
/* pte already populated, the following shouldn't fail */
- ret = __pcpu_map_pages(unit_addr,
- &pcpu4k_pages[cpu * pcpu4k_unit_pages],
- pcpu4k_unit_pages);
+ ret = __pcpu_map_pages(unit_addr, &pages[cpu * unit_pages],
+ unit_pages);
if (ret < 0)
panic("failed to map percpu area, err=%zd\n", ret);
/* we're ready, commit */
pr_info("PERCPU: %d 4k pages per cpu, static data %zu bytes\n",
- pcpu4k_unit_pages, static_size);
+ unit_pages, static_size);
- ret = pcpu_setup_first_chunk(pcpu4k_get_page, static_size,
- reserved_size, -1,
- pcpu4k_unit_pages << PAGE_SHIFT, vm.addr);
+ ret = pcpu_setup_first_chunk(static_size, reserved_size, -1,
+ unit_pages << PAGE_SHIFT, vm.addr);
goto out_free_ar;
enomem:
while (--j >= 0)
- free_fn(page_address(pcpu4k_pages[j]), PAGE_SIZE);
+ free_fn(page_address(pages[j]), PAGE_SIZE);
ret = -ENOMEM;
out_free_ar:
- free_bootmem(__pa(pcpu4k_pages), pages_size);
+ free_bootmem(__pa(pages), pages_size);
return ret;
}
static struct pcpul_ent *pcpul_map;
static struct vm_struct pcpul_vm;
-static struct page * __init pcpul_get_page(unsigned int cpu, int pageno)
-{
- size_t off = (size_t)pageno << PAGE_SHIFT;
-
- if (off >= pcpul_size)
- return NULL;
-
- return virt_to_page(pcpul_map[cpu].ptr + off);
-}
-
/**
* pcpu_lpage_first_chunk - remap the first percpu chunk using large page
* @static_size: the size of static percpu area in bytes
pr_info("PERCPU: Remapped at %p with large pages, static data "
"%zu bytes\n", pcpul_vm.addr, static_size);
- ret = pcpu_setup_first_chunk(pcpul_get_page, static_size,
- reserved_size, dyn_size, pcpul_unit_size,
- pcpul_vm.addr);
+ ret = pcpu_setup_first_chunk(static_size, reserved_size, dyn_size,
+ pcpul_unit_size, pcpul_vm.addr);
/* sort pcpul_map array for pcpu_lpage_remapped() */
for (i = 0; i < num_possible_cpus() - 1; i++)
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff