cregit-Linux how code gets into the kernel

Release 4.10 lib/genalloc.c

Directory: lib
/*
 * Basic general purpose allocator for managing special purpose
 * memory, for example, memory that is not managed by the regular
 * kmalloc/kfree interface.  Uses for this includes on-device special
 * memory, uncached memory etc.
 *
 * It is safe to use the allocator in NMI handlers and other special
 * unblockable contexts that could otherwise deadlock on locks.  This
 * is implemented by using atomic operations and retries on any
 * conflicts.  The disadvantage is that there may be livelocks in
 * extreme cases.  For better scalability, one allocator can be used
 * for each CPU.
 *
 * The lockless operation only works if there is enough memory
 * available.  If new memory is added to the pool a lock has to be
 * still taken.  So any user relying on locklessness has to ensure
 * that sufficient memory is preallocated.
 *
 * The basic atomic operation of this allocator is cmpxchg on long.
 * On architectures that don't have NMI-safe cmpxchg implementation,
 * the allocator can NOT be used in NMI handler.  So code uses the
 * allocator in NMI handler should depend on
 * CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG.
 *
 * Copyright 2005 (C) Jes Sorensen <jes@trained-monkey.org>
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2.  See the file COPYING for more details.
 */

#include <linux/slab.h>
#include <linux/export.h>
#include <linux/bitmap.h>
#include <linux/rculist.h>
#include <linux/interrupt.h>
#include <linux/genalloc.h>
#include <linux/of_device.h>


static inline size_t chunk_size(const struct gen_pool_chunk *chunk) { return chunk->end_addr - chunk->start_addr + 1; }

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static int set_bits_ll(unsigned long *addr, unsigned long mask_to_set) { unsigned long val, nval; nval = *addr; do { val = nval; if (val & mask_to_set) return -EBUSY; cpu_relax(); } while ((nval = cmpxchg(addr, val, val | mask_to_set)) != val); return 0; }

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huang yinghuang ying69100.00%1100.00%
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static int clear_bits_ll(unsigned long *addr, unsigned long mask_to_clear) { unsigned long val, nval; nval = *addr; do { val = nval; if ((val & mask_to_clear) != mask_to_clear) return -EBUSY; cpu_relax(); } while ((nval = cmpxchg(addr, val, val & ~mask_to_clear)) != val); return 0; }

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huang yinghuang ying74100.00%1100.00%
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/* * bitmap_set_ll - set the specified number of bits at the specified position * @map: pointer to a bitmap * @start: a bit position in @map * @nr: number of bits to set * * Set @nr bits start from @start in @map lock-lessly. Several users * can set/clear the same bitmap simultaneously without lock. If two * users set the same bit, one user will return remain bits, otherwise * return 0. */
static int bitmap_set_ll(unsigned long *map, int start, int nr) { unsigned long *p = map + BIT_WORD(start); const int size = start + nr; int bits_to_set = BITS_PER_LONG - (start % BITS_PER_LONG); unsigned long mask_to_set = BITMAP_FIRST_WORD_MASK(start); while (nr - bits_to_set >= 0) { if (set_bits_ll(p, mask_to_set)) return nr; nr -= bits_to_set; bits_to_set = BITS_PER_LONG; mask_to_set = ~0UL; p++; } if (nr) { mask_to_set &= BITMAP_LAST_WORD_MASK(size); if (set_bits_ll(p, mask_to_set)) return nr; } return 0; }

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huang yinghuang ying123100.00%1100.00%
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/* * bitmap_clear_ll - clear the specified number of bits at the specified position * @map: pointer to a bitmap * @start: a bit position in @map * @nr: number of bits to set * * Clear @nr bits start from @start in @map lock-lessly. Several users * can set/clear the same bitmap simultaneously without lock. If two * users clear the same bit, one user will return remain bits, * otherwise return 0. */
static int bitmap_clear_ll(unsigned long *map, int start, int nr) { unsigned long *p = map + BIT_WORD(start); const int size = start + nr; int bits_to_clear = BITS_PER_LONG - (start % BITS_PER_LONG); unsigned long mask_to_clear = BITMAP_FIRST_WORD_MASK(start); while (nr - bits_to_clear >= 0) { if (clear_bits_ll(p, mask_to_clear)) return nr; nr -= bits_to_clear; bits_to_clear = BITS_PER_LONG; mask_to_clear = ~0UL; p++; } if (nr) { mask_to_clear &= BITMAP_LAST_WORD_MASK(size); if (clear_bits_ll(p, mask_to_clear)) return nr; } return 0; }

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/** * gen_pool_create - create a new special memory pool * @min_alloc_order: log base 2 of number of bytes each bitmap bit represents * @nid: node id of the node the pool structure should be allocated on, or -1 * * Create a new special memory pool that can be used to manage special purpose * memory not managed by the regular kmalloc/kfree interface. */
struct gen_pool *gen_pool_create(int min_alloc_order, int nid) { struct gen_pool *pool; pool = kmalloc_node(sizeof(struct gen_pool), GFP_KERNEL, nid); if (pool != NULL) { spin_lock_init(&pool->lock); INIT_LIST_HEAD(&pool->chunks); pool->min_alloc_order = min_alloc_order; pool->algo = gen_pool_first_fit; pool->data = NULL; pool->name = NULL; } return pool; }

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dean nelsondean nelson3440.48%120.00%
jes sorensenjes sorensen3136.90%120.00%
benjamin gaignardbenjamin gaignard1214.29%120.00%
vladimir zapolskiyvladimir zapolskiy67.14%120.00%
huang yinghuang ying11.19%120.00%
Total84100.00%5100.00%

EXPORT_SYMBOL(gen_pool_create); /** * gen_pool_add_virt - add a new chunk of special memory to the pool * @pool: pool to add new memory chunk to * @virt: virtual starting address of memory chunk to add to pool * @phys: physical starting address of memory chunk to add to pool * @size: size in bytes of the memory chunk to add to pool * @nid: node id of the node the chunk structure and bitmap should be * allocated on, or -1 * * Add a new chunk of special memory to the specified pool. * * Returns 0 on success or a -ve errno on failure. */
int gen_pool_add_virt(struct gen_pool *pool, unsigned long virt, phys_addr_t phys, size_t size, int nid) { struct gen_pool_chunk *chunk; int nbits = size >> pool->min_alloc_order; int nbytes = sizeof(struct gen_pool_chunk) + BITS_TO_LONGS(nbits) * sizeof(long); chunk = kzalloc_node(nbytes, GFP_KERNEL, nid); if (unlikely(chunk == NULL)) return -ENOMEM; chunk->phys_addr = phys; chunk->start_addr = virt; chunk->end_addr = virt + size - 1; atomic_set(&chunk->avail, size); spin_lock(&pool->lock); list_add_rcu(&chunk->next_chunk, &pool->chunks); spin_unlock(&pool->lock); return 0; }

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dean nelsondean nelson7250.00%114.29%
jes sorensenjes sorensen3423.61%114.29%
jean-christophe plagniol-villardjean-christophe plagniol-villard149.72%114.29%
huang yinghuang ying139.03%114.29%
thadeu lima de souza cascardothadeu lima de souza cascardo85.56%114.29%
joonyoung shimjoonyoung shim21.39%114.29%
joe perchesjoe perches10.69%114.29%
Total144100.00%7100.00%

EXPORT_SYMBOL(gen_pool_add_virt); /** * gen_pool_virt_to_phys - return the physical address of memory * @pool: pool to allocate from * @addr: starting address of memory * * Returns the physical address on success, or -1 on error. */
phys_addr_t gen_pool_virt_to_phys(struct gen_pool *pool, unsigned long addr) { struct gen_pool_chunk *chunk; phys_addr_t paddr = -1; rcu_read_lock(); list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk) { if (addr >= chunk->start_addr && addr <= chunk->end_addr) { paddr = chunk->phys_addr + (addr - chunk->start_addr); break; } } rcu_read_unlock(); return paddr; }

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jean-christophe plagniol-villardjean-christophe plagniol-villard5168.00%133.33%
huang yinghuang ying2330.67%133.33%
joonyoung shimjoonyoung shim11.33%133.33%
Total75100.00%3100.00%

EXPORT_SYMBOL(gen_pool_virt_to_phys); /** * gen_pool_destroy - destroy a special memory pool * @pool: pool to destroy * * Destroy the specified special memory pool. Verifies that there are no * outstanding allocations. */
void gen_pool_destroy(struct gen_pool *pool) { struct list_head *_chunk, *_next_chunk; struct gen_pool_chunk *chunk; int order = pool->min_alloc_order; int bit, end_bit; list_for_each_safe(_chunk, _next_chunk, &pool->chunks) { chunk = list_entry(_chunk, struct gen_pool_chunk, next_chunk); list_del(&chunk->next_chunk); end_bit = chunk_size(chunk) >> order; bit = find_next_bit(chunk->bits, end_bit, 0); BUG_ON(bit < end_bit); kfree(chunk); } kfree_const(pool->name); kfree(pool); }

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steve wisesteve wise10190.99%133.33%
vladimir zapolskiyvladimir zapolskiy76.31%133.33%
joonyoung shimjoonyoung shim32.70%133.33%
Total111100.00%3100.00%

EXPORT_SYMBOL(gen_pool_destroy); /** * gen_pool_alloc - allocate special memory from the pool * @pool: pool to allocate from * @size: number of bytes to allocate from the pool * * Allocate the requested number of bytes from the specified pool. * Uses the pool allocation function (with first-fit algorithm by default). * Can not be used in NMI handler on architectures without * NMI-safe cmpxchg implementation. */
unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size) { return gen_pool_alloc_algo(pool, size, pool->algo, pool->data); }

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zhao qiangzhao qiang1756.67%133.33%
jes sorensenjes sorensen1136.67%133.33%
dean nelsondean nelson26.67%133.33%
Total30100.00%3100.00%

EXPORT_SYMBOL(gen_pool_alloc); /** * gen_pool_alloc_algo - allocate special memory from the pool * @pool: pool to allocate from * @size: number of bytes to allocate from the pool * @algo: algorithm passed from caller * @data: data passed to algorithm * * Allocate the requested number of bytes from the specified pool. * Uses the pool allocation function (with first-fit algorithm by default). * Can not be used in NMI handler on architectures without * NMI-safe cmpxchg implementation. */
unsigned long gen_pool_alloc_algo(struct gen_pool *pool, size_t size, genpool_algo_t algo, void *data) { struct gen_pool_chunk *chunk; unsigned long addr = 0; int order = pool->min_alloc_order; int nbits, start_bit, end_bit, remain; #ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG BUG_ON(in_nmi()); #endif if (size == 0) return 0; nbits = (size + (1UL << order) - 1) >> order; rcu_read_lock(); list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk) { if (size > atomic_read(&chunk->avail)) continue; start_bit = 0; end_bit = chunk_size(chunk) >> order; retry: start_bit = algo(chunk->bits, end_bit, start_bit, nbits, data, pool); if (start_bit >= end_bit) continue; remain = bitmap_set_ll(chunk->bits, start_bit, nbits); if (remain) { remain = bitmap_clear_ll(chunk->bits, start_bit, nbits - remain); BUG_ON(remain); goto retry; } addr = chunk->start_addr + ((unsigned long)start_bit << order); size = nbits << order; atomic_sub(size, &chunk->avail); break; } rcu_read_unlock(); return addr; }

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huang yinghuang ying8436.21%111.11%
dean nelsondean nelson7130.60%111.11%
jes sorensenjes sorensen3816.38%111.11%
zhao qiangzhao qiang229.48%111.11%
akinobu mitaakinobu mita62.59%111.11%
daniel mentzdaniel mentz41.72%111.11%
joonyoung shimjoonyoung shim31.29%111.11%
benjamin gaignardbenjamin gaignard20.86%111.11%
chris humbertchris humbert20.86%111.11%
Total232100.00%9100.00%

EXPORT_SYMBOL(gen_pool_alloc_algo); /** * gen_pool_dma_alloc - allocate special memory from the pool for DMA usage * @pool: pool to allocate from * @size: number of bytes to allocate from the pool * @dma: dma-view physical address return value. Use NULL if unneeded. * * Allocate the requested number of bytes from the specified pool. * Uses the pool allocation function (with first-fit algorithm by default). * Can not be used in NMI handler on architectures without * NMI-safe cmpxchg implementation. */
void *gen_pool_dma_alloc(struct gen_pool *pool, size_t size, dma_addr_t *dma) { unsigned long vaddr; if (!pool) return NULL; vaddr = gen_pool_alloc(pool, size); if (!vaddr) return NULL; if (dma) *dma = gen_pool_virt_to_phys(pool, vaddr); return (void *)vaddr; }

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nicolin chennicolin chen6494.12%150.00%
prabhakar ladprabhakar lad45.88%150.00%
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EXPORT_SYMBOL(gen_pool_dma_alloc); /** * gen_pool_free - free allocated special memory back to the pool * @pool: pool to free to * @addr: starting address of memory to free back to pool * @size: size in bytes of memory to free * * Free previously allocated special memory back to the specified * pool. Can not be used in NMI handler on architectures without * NMI-safe cmpxchg implementation. */
void gen_pool_free(struct gen_pool *pool, unsigned long addr, size_t size) { struct gen_pool_chunk *chunk; int order = pool->min_alloc_order; int start_bit, nbits, remain; #ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG BUG_ON(in_nmi()); #endif nbits = (size + (1UL << order) - 1) >> order; rcu_read_lock(); list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk) { if (addr >= chunk->start_addr && addr <= chunk->end_addr) { BUG_ON(addr + size - 1 > chunk->end_addr); start_bit = (addr - chunk->start_addr) >> order; remain = bitmap_clear_ll(chunk->bits, start_bit, nbits); BUG_ON(remain); size = nbits << order; atomic_add(size, &chunk->avail); rcu_read_unlock(); return; } } rcu_read_unlock(); BUG(); }

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joonyoung shimjoonyoung shim31.86%125.00%
Total161100.00%4100.00%

EXPORT_SYMBOL(gen_pool_free); /** * gen_pool_for_each_chunk - call func for every chunk of generic memory pool * @pool: the generic memory pool * @func: func to call * @data: additional data used by @func * * Call @func for every chunk of generic memory pool. The @func is * called with rcu_read_lock held. */
void gen_pool_for_each_chunk(struct gen_pool *pool, void (*func)(struct gen_pool *pool, struct gen_pool_chunk *chunk, void *data), void *data) { struct gen_pool_chunk *chunk; rcu_read_lock(); list_for_each_entry_rcu(chunk, &(pool)->chunks, next_chunk) func(pool, chunk, data); rcu_read_unlock(); }

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EXPORT_SYMBOL(gen_pool_for_each_chunk); /** * addr_in_gen_pool - checks if an address falls within the range of a pool * @pool: the generic memory pool * @start: start address * @size: size of the region * * Check if the range of addresses falls within the specified pool. Returns * true if the entire range is contained in the pool and false otherwise. */
bool addr_in_gen_pool(struct gen_pool *pool, unsigned long start, size_t size) { bool found = false; unsigned long end = start + size - 1; struct gen_pool_chunk *chunk; rcu_read_lock(); list_for_each_entry_rcu(chunk, &(pool)->chunks, next_chunk) { if (start >= chunk->start_addr && start <= chunk->end_addr) { if (end <= chunk->end_addr) { found = true; break; } } } rcu_read_unlock(); return found; }

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toshi kikuchitoshi kikuchi22.30%150.00%
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/** * gen_pool_avail - get available free space of the pool * @pool: pool to get available free space * * Return available free space of the specified pool. */
size_t gen_pool_avail(struct gen_pool *pool) { struct gen_pool_chunk *chunk; size_t avail = 0; rcu_read_lock(); list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk) avail += atomic_read(&chunk->avail); rcu_read_unlock(); return avail; }

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dean nelsondean nelson12.13%133.33%
Total47100.00%3100.00%

EXPORT_SYMBOL_GPL(gen_pool_avail); /** * gen_pool_size - get size in bytes of memory managed by the pool * @pool: pool to get size * * Return size in bytes of memory managed by the pool. */
size_t gen_pool_size(struct gen_pool *pool) { struct gen_pool_chunk *chunk; size_t size = 0; rcu_read_lock(); list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk) size += chunk_size(chunk); rcu_read_unlock(); return size; }

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EXPORT_SYMBOL_GPL(gen_pool_size); /** * gen_pool_set_algo - set the allocation algorithm * @pool: pool to change allocation algorithm * @algo: custom algorithm function * @data: additional data used by @algo * * Call @algo for each memory allocation in the pool. * If @algo is NULL use gen_pool_first_fit as default * memory allocation function. */
void gen_pool_set_algo(struct gen_pool *pool, genpool_algo_t algo, void *data) { rcu_read_lock(); pool->algo = algo; if (!pool->algo) pool->algo = gen_pool_first_fit; pool->data = data; rcu_read_unlock(); }

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benjamin gaignardbenjamin gaignard48100.00%1100.00%
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EXPORT_SYMBOL(gen_pool_set_algo); /** * gen_pool_first_fit - find the first available region * of memory matching the size requirement (no alignment constraint) * @map: The address to base the search on * @size: The bitmap size in bits * @start: The bitnumber to start searching at * @nr: The number of zeroed bits we're looking for * @data: additional data - unused * @pool: pool to find the fit region memory from */
unsigned long gen_pool_first_fit(unsigned long *map, unsigned long size, unsigned long start, unsigned int nr, void *data, struct gen_pool *pool) { return bitmap_find_next_zero_area(map, size, start, nr, 0); }

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benjamin gaignardbenjamin gaignard4189.13%150.00%
zhao qiangzhao qiang510.87%150.00%
Total46100.00%2100.00%

EXPORT_SYMBOL(gen_pool_first_fit); /** * gen_pool_first_fit_align - find the first available region * of memory matching the size requirement (alignment constraint) * @map: The address to base the search on * @size: The bitmap size in bits * @start: The bitnumber to start searching at * @nr: The number of zeroed bits we're looking for * @data: data for alignment * @pool: pool to get order from */
unsigned long gen_pool_first_fit_align(unsigned long *map, unsigned long size, unsigned long start, unsigned int nr, void *data, struct gen_pool *pool) { struct genpool_data_align *alignment; unsigned long align_mask; int order; alignment = data; order = pool->min_alloc_order; align_mask = ((alignment->align + (1UL << order) - 1) >> order) - 1; return bitmap_find_next_zero_area(map, size, start, nr, align_mask); }

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zhao qiangzhao qiang90100.00%1100.00%
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EXPORT_SYMBOL(gen_pool_first_fit_align); /** * gen_pool_fixed_alloc - reserve a specific region * @map: The address to base the search on * @size: The bitmap size in bits * @start: The bitnumber to start searching at * @nr: The number of zeroed bits we're looking for * @data: data for alignment * @pool: pool to get order from */
unsigned long gen_pool_fixed_alloc(unsigned long *map, unsigned long size, unsigned long start, unsigned int nr, void *data, struct gen_pool *pool) { struct genpool_data_fixed *fixed_data; int order; unsigned long offset_bit; unsigned long start_bit; fixed_data = data; order = pool->min_alloc_order; offset_bit = fixed_data->offset >> order; if (WARN_ON(fixed_data->offset & ((1UL << order) - 1))) return size; start_bit = bitmap_find_next_zero_area(map, size, start + offset_bit, nr, 0); if (start_bit != offset_bit) start_bit = size; return start_bit; }

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EXPORT_SYMBOL(gen_pool_fixed_alloc); /** * gen_pool_first_fit_order_align - find the first available region * of memory matching the size requirement. The region will be aligned * to the order of the size specified. * @map: The address to base the search on * @size: The bitmap size in bits * @start: The bitnumber to start searching at * @nr: The number of zeroed bits we're looking for * @data: additional data - unused * @pool: pool to find the fit region memory from */
unsigned long gen_pool_first_fit_order_align(unsigned long *map, unsigned long size, unsigned long start, unsigned int nr, void *data, struct gen_pool *pool) { unsigned long align_mask = roundup_pow_of_two(nr) - 1; return bitmap_find_next_zero_area(map, size, start, nr, align_mask); }

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laura abbottlaura abbott5291.23%150.00%
zhao qiangzhao qiang58.77%150.00%
Total57100.00%2100.00%

EXPORT_SYMBOL(gen_pool_first_fit_order_align); /** * gen_pool_best_fit - find the best fitting region of memory * macthing the size requirement (no alignment constraint) * @map: The address to base the search on * @size: The bitmap size in bits * @start: The bitnumber to start searching at * @nr: The number of zeroed bits we're looking for * @data: additional data - unused * @pool: pool to find the fit region memory from * * Iterate over the bitmap to find the smallest free region * which we can allocate the memory. */
unsigned long gen_pool_best_fit(unsigned long *map, unsigned long size, unsigned long start, unsigned int nr, void *data, struct gen_pool *pool) { unsigned long start_bit = size; unsigned long len = size + 1; unsigned long index; index = bitmap_find_next_zero_area(map, size, start, nr, 0); while (index < size) { int next_bit = find_next_bit(map, size, index + nr); if ((next_bit - index) < len) { len = next_bit - index; start_bit = index; if (len == nr) return start_bit; } index = bitmap_find_next_zero_area(map, size, next_bit + 1, nr, 0); } return start_bit; }

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benjamin gaignardbenjamin gaignard13396.38%150.00%
zhao qiangzhao qiang53.62%150.00%
Total138100.00%2100.00%

EXPORT_SYMBOL(gen_pool_best_fit);
static void devm_gen_pool_release(struct device *dev, void *res) { gen_pool_destroy(*(struct gen_pool **)res); }

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philipp zabelphilipp zabel27100.00%1100.00%
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static int devm_gen_pool_match(struct device *dev, void *res, void *data) { struct gen_pool **p = res; /* NULL data matches only a pool without an assigned name */ if (!data && !(*p)->name) return 1; if (!data || !(*p)->name) return 0; return !strcmp((*p)->name, data); }

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vladimir zapolskiyvladimir zapolskiy74100.00%1100.00%
Total74100.00%1100.00%

/** * gen_pool_get - Obtain the gen_pool (if any) for a device * @dev: device to retrieve the gen_pool from * @name: name of a gen_pool or NULL, identifies a particular gen_pool on device * * Returns the gen_pool for the device if one is present, or NULL. */
struct gen_pool *gen_pool_get(struct device *dev, const char *name) { struct gen_pool **p; p = devres_find(dev, devm_gen_pool_release, devm_gen_pool_match, (void *)name); if (!p) return NULL; return *p; }

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vladimir zapolskiyvladimir zapolskiy52100.00%2100.00%
Total52100.00%2100.00%

EXPORT_SYMBOL_GPL(gen_pool_get); /** * devm_gen_pool_create - managed gen_pool_create * @dev: device that provides the gen_pool * @min_alloc_order: log base 2 of number of bytes each bitmap bit represents * @nid: node selector for allocated gen_pool, %NUMA_NO_NODE for all nodes * @name: name of a gen_pool or NULL, identifies a particular gen_pool on device * * Create a new special memory pool that can be used to manage special purpose * memory not managed by the regular kmalloc/kfree interface. The pool will be * automatically destroyed by the device management code. */
struct gen_pool *devm_gen_pool_create(struct device *dev, int min_alloc_order, int nid, const char *name) { struct gen_pool **ptr, *pool; const char *pool_name = NULL; /* Check that genpool to be created is uniquely addressed on device */ if (gen_pool_get(dev, name)) return ERR_PTR(-EINVAL); if (name) { pool_name = kstrdup_const(name, GFP_KERNEL); if (!pool_name) return ERR_PTR(-ENOMEM); } ptr = devres_alloc(devm_gen_pool_release, sizeof(*ptr), GFP_KERNEL); if (!ptr) goto free_pool_name; pool = gen_pool_create(min_alloc_order, nid); if (!pool) goto free_devres; *ptr = pool; pool->name = pool_name; devres_add(dev, ptr); return pool; free_devres: devres_free(ptr); free_pool_name: kfree_const(pool_name); return ERR_PTR(-ENOMEM); }

Contributors

PersonTokensPropCommitsCommitProp
vladimir zapolskiyvladimir zapolskiy8853.33%250.00%
philipp zabelphilipp zabel7243.64%125.00%
jan karajan kara53.03%125.00%
Total165100.00%4100.00%

EXPORT_SYMBOL(devm_gen_pool_create); #ifdef CONFIG_OF /** * of_gen_pool_get - find a pool by phandle property * @np: device node * @propname: property name containing phandle(s) * @index: index into the phandle array * * Returns the pool that contains the chunk starting at the physical * address of the device tree node pointed at by the phandle property, * or NULL if not found. */
struct gen_pool *of_gen_pool_get(struct device_node *np, const char *propname, int index) { struct platform_device *pdev; struct device_node *np_pool, *parent; const char *name = NULL; struct gen_pool *pool = NULL; np_pool = of_parse_phandle(np, propname, index); if (!np_pool) return NULL; pdev = of_find_device_by_node(np_pool); if (!pdev) { /* Check if named gen_pool is created by parent node device */ parent = of_get_parent(np_pool); pdev = of_find_device_by_node(parent); of_node_put(parent); of_property_read_string(np_pool, "label", &name); if (!name) name = np_pool->name; } if (pdev) pool = gen_pool_get(&pdev->dev, name); of_node_put(np_pool); return pool; }

Contributors

PersonTokensPropCommitsCommitProp
vladimir zapolskiyvladimir zapolskiy7853.79%583.33%
philipp zabelphilipp zabel6746.21%116.67%
Total145100.00%6100.00%

EXPORT_SYMBOL_GPL(of_gen_pool_get); #endif /* CONFIG_OF */

Overall Contributors

PersonTokensPropCommitsCommitProp
huang yinghuang ying73627.57%13.23%
vladimir zapolskiyvladimir zapolskiy31411.76%516.13%
zhao qiangzhao qiang28410.64%39.68%
dean nelsondean nelson2569.59%26.45%
benjamin gaignardbenjamin gaignard2539.48%13.23%
philipp zabelphilipp zabel1796.70%13.23%
jes sorensenjes sorensen1736.48%13.23%
laura abbottlaura abbott1435.36%26.45%
steve wisesteve wise1063.97%13.23%
jean-christophe plagniol-villardjean-christophe plagniol-villard732.73%13.23%
nicolin chennicolin chen692.58%13.23%
joonyoung shimjoonyoung shim391.46%13.23%
akinobu mitaakinobu mita90.34%13.23%
thadeu lima de souza cascardothadeu lima de souza cascardo80.30%13.23%
jan karajan kara50.19%13.23%
prabhakar ladprabhakar lad50.19%13.23%
michal simekmichal simek50.19%13.23%
daniel mentzdaniel mentz40.15%13.23%
tejun heotejun heo30.11%13.23%
chris humbertchris humbert20.07%13.23%
toshi kikuchitoshi kikuchi20.07%13.23%
paul gortmakerpaul gortmaker10.04%13.23%
joe perchesjoe perches10.04%13.23%
Total2670100.00%31100.00%
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