mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 03:26:40 +07:00
35004f2e55
Fixes build break on most ARM/ARM64 defconfigs:
lib/genalloc.c: In function 'gen_pool_add_virt':
lib/genalloc.c:190:10: error: implicit declaration of function 'vzalloc_node'; did you mean 'kzalloc_node'?
lib/genalloc.c:190:8: warning: assignment to 'struct gen_pool_chunk *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
lib/genalloc.c: In function 'gen_pool_destroy':
lib/genalloc.c:254:3: error: implicit declaration of function 'vfree'; did you mean 'kfree'?
Fixes: 6862d2fc81
('lib/genalloc.c: use vzalloc_node() to allocate the bitmap')
Cc: Huang Shijie <sjhuang@iluvatar.ai>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexey Skidanov <alexey.skidanov@intel.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
786 lines
22 KiB
C
786 lines
22 KiB
C
/*
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* Basic general purpose allocator for managing special purpose
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* memory, for example, memory that is not managed by the regular
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* kmalloc/kfree interface. Uses for this includes on-device special
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* memory, uncached memory etc.
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*
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* It is safe to use the allocator in NMI handlers and other special
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* unblockable contexts that could otherwise deadlock on locks. This
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* is implemented by using atomic operations and retries on any
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* conflicts. The disadvantage is that there may be livelocks in
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* extreme cases. For better scalability, one allocator can be used
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* for each CPU.
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*
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* The lockless operation only works if there is enough memory
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* available. If new memory is added to the pool a lock has to be
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* still taken. So any user relying on locklessness has to ensure
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* that sufficient memory is preallocated.
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*
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* The basic atomic operation of this allocator is cmpxchg on long.
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* On architectures that don't have NMI-safe cmpxchg implementation,
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* the allocator can NOT be used in NMI handler. So code uses the
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* allocator in NMI handler should depend on
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* CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG.
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*
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* Copyright 2005 (C) Jes Sorensen <jes@trained-monkey.org>
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*
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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*/
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <linux/bitmap.h>
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#include <linux/rculist.h>
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#include <linux/interrupt.h>
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#include <linux/genalloc.h>
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#include <linux/of_device.h>
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#include <linux/vmalloc.h>
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static inline size_t chunk_size(const struct gen_pool_chunk *chunk)
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{
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return chunk->end_addr - chunk->start_addr + 1;
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}
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static int set_bits_ll(unsigned long *addr, unsigned long mask_to_set)
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{
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unsigned long val, nval;
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nval = *addr;
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do {
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val = nval;
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if (val & mask_to_set)
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return -EBUSY;
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cpu_relax();
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} while ((nval = cmpxchg(addr, val, val | mask_to_set)) != val);
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return 0;
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}
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static int clear_bits_ll(unsigned long *addr, unsigned long mask_to_clear)
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{
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unsigned long val, nval;
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nval = *addr;
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do {
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val = nval;
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if ((val & mask_to_clear) != mask_to_clear)
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return -EBUSY;
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cpu_relax();
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} while ((nval = cmpxchg(addr, val, val & ~mask_to_clear)) != val);
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return 0;
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}
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/*
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* bitmap_set_ll - set the specified number of bits at the specified position
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* @map: pointer to a bitmap
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* @start: a bit position in @map
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* @nr: number of bits to set
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*
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* Set @nr bits start from @start in @map lock-lessly. Several users
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* can set/clear the same bitmap simultaneously without lock. If two
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* users set the same bit, one user will return remain bits, otherwise
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* return 0.
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*/
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static int bitmap_set_ll(unsigned long *map, int start, int nr)
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{
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unsigned long *p = map + BIT_WORD(start);
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const int size = start + nr;
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int bits_to_set = BITS_PER_LONG - (start % BITS_PER_LONG);
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unsigned long mask_to_set = BITMAP_FIRST_WORD_MASK(start);
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while (nr - bits_to_set >= 0) {
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if (set_bits_ll(p, mask_to_set))
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return nr;
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nr -= bits_to_set;
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bits_to_set = BITS_PER_LONG;
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mask_to_set = ~0UL;
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p++;
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}
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if (nr) {
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mask_to_set &= BITMAP_LAST_WORD_MASK(size);
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if (set_bits_ll(p, mask_to_set))
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return nr;
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}
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return 0;
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}
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/*
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* bitmap_clear_ll - clear the specified number of bits at the specified position
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* @map: pointer to a bitmap
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* @start: a bit position in @map
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* @nr: number of bits to set
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*
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* Clear @nr bits start from @start in @map lock-lessly. Several users
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* can set/clear the same bitmap simultaneously without lock. If two
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* users clear the same bit, one user will return remain bits,
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* otherwise return 0.
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*/
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static int bitmap_clear_ll(unsigned long *map, int start, int nr)
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{
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unsigned long *p = map + BIT_WORD(start);
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const int size = start + nr;
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int bits_to_clear = BITS_PER_LONG - (start % BITS_PER_LONG);
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unsigned long mask_to_clear = BITMAP_FIRST_WORD_MASK(start);
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while (nr - bits_to_clear >= 0) {
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if (clear_bits_ll(p, mask_to_clear))
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return nr;
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nr -= bits_to_clear;
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bits_to_clear = BITS_PER_LONG;
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mask_to_clear = ~0UL;
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p++;
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}
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if (nr) {
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mask_to_clear &= BITMAP_LAST_WORD_MASK(size);
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if (clear_bits_ll(p, mask_to_clear))
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return nr;
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}
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return 0;
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}
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/**
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* gen_pool_create - create a new special memory pool
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* @min_alloc_order: log base 2 of number of bytes each bitmap bit represents
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* @nid: node id of the node the pool structure should be allocated on, or -1
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*
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* Create a new special memory pool that can be used to manage special purpose
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* memory not managed by the regular kmalloc/kfree interface.
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*/
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struct gen_pool *gen_pool_create(int min_alloc_order, int nid)
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{
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struct gen_pool *pool;
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pool = kmalloc_node(sizeof(struct gen_pool), GFP_KERNEL, nid);
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if (pool != NULL) {
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spin_lock_init(&pool->lock);
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INIT_LIST_HEAD(&pool->chunks);
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pool->min_alloc_order = min_alloc_order;
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pool->algo = gen_pool_first_fit;
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pool->data = NULL;
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pool->name = NULL;
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}
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return pool;
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}
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EXPORT_SYMBOL(gen_pool_create);
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/**
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* gen_pool_add_virt - add a new chunk of special memory to the pool
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* @pool: pool to add new memory chunk to
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* @virt: virtual starting address of memory chunk to add to pool
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* @phys: physical starting address of memory chunk to add to pool
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* @size: size in bytes of the memory chunk to add to pool
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* @nid: node id of the node the chunk structure and bitmap should be
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* allocated on, or -1
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*
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* Add a new chunk of special memory to the specified pool.
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*
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* Returns 0 on success or a -ve errno on failure.
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*/
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int gen_pool_add_virt(struct gen_pool *pool, unsigned long virt, phys_addr_t phys,
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size_t size, int nid)
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{
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struct gen_pool_chunk *chunk;
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int nbits = size >> pool->min_alloc_order;
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int nbytes = sizeof(struct gen_pool_chunk) +
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BITS_TO_LONGS(nbits) * sizeof(long);
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chunk = vzalloc_node(nbytes, nid);
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if (unlikely(chunk == NULL))
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return -ENOMEM;
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chunk->phys_addr = phys;
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chunk->start_addr = virt;
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chunk->end_addr = virt + size - 1;
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atomic_long_set(&chunk->avail, size);
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spin_lock(&pool->lock);
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list_add_rcu(&chunk->next_chunk, &pool->chunks);
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spin_unlock(&pool->lock);
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return 0;
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}
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EXPORT_SYMBOL(gen_pool_add_virt);
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/**
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* gen_pool_virt_to_phys - return the physical address of memory
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* @pool: pool to allocate from
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* @addr: starting address of memory
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*
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* Returns the physical address on success, or -1 on error.
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*/
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phys_addr_t gen_pool_virt_to_phys(struct gen_pool *pool, unsigned long addr)
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{
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struct gen_pool_chunk *chunk;
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phys_addr_t paddr = -1;
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rcu_read_lock();
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list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk) {
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if (addr >= chunk->start_addr && addr <= chunk->end_addr) {
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paddr = chunk->phys_addr + (addr - chunk->start_addr);
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break;
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}
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}
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rcu_read_unlock();
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return paddr;
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}
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EXPORT_SYMBOL(gen_pool_virt_to_phys);
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/**
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* gen_pool_destroy - destroy a special memory pool
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* @pool: pool to destroy
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*
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* Destroy the specified special memory pool. Verifies that there are no
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* outstanding allocations.
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*/
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void gen_pool_destroy(struct gen_pool *pool)
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{
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struct list_head *_chunk, *_next_chunk;
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struct gen_pool_chunk *chunk;
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int order = pool->min_alloc_order;
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int bit, end_bit;
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list_for_each_safe(_chunk, _next_chunk, &pool->chunks) {
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chunk = list_entry(_chunk, struct gen_pool_chunk, next_chunk);
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list_del(&chunk->next_chunk);
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end_bit = chunk_size(chunk) >> order;
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bit = find_next_bit(chunk->bits, end_bit, 0);
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BUG_ON(bit < end_bit);
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vfree(chunk);
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}
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kfree_const(pool->name);
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kfree(pool);
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}
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EXPORT_SYMBOL(gen_pool_destroy);
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/**
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* gen_pool_alloc - allocate special memory from the pool
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* @pool: pool to allocate from
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* @size: number of bytes to allocate from the pool
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*
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* Allocate the requested number of bytes from the specified pool.
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* Uses the pool allocation function (with first-fit algorithm by default).
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* Can not be used in NMI handler on architectures without
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* NMI-safe cmpxchg implementation.
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*/
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unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size)
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{
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return gen_pool_alloc_algo(pool, size, pool->algo, pool->data);
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}
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EXPORT_SYMBOL(gen_pool_alloc);
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/**
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* gen_pool_alloc_algo - allocate special memory from the pool
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* @pool: pool to allocate from
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* @size: number of bytes to allocate from the pool
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* @algo: algorithm passed from caller
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* @data: data passed to algorithm
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*
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* Allocate the requested number of bytes from the specified pool.
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* Uses the pool allocation function (with first-fit algorithm by default).
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* Can not be used in NMI handler on architectures without
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* NMI-safe cmpxchg implementation.
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*/
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unsigned long gen_pool_alloc_algo(struct gen_pool *pool, size_t size,
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genpool_algo_t algo, void *data)
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{
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struct gen_pool_chunk *chunk;
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unsigned long addr = 0;
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int order = pool->min_alloc_order;
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int nbits, start_bit, end_bit, remain;
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#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
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BUG_ON(in_nmi());
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#endif
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if (size == 0)
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return 0;
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nbits = (size + (1UL << order) - 1) >> order;
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rcu_read_lock();
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list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk) {
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if (size > atomic_long_read(&chunk->avail))
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continue;
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start_bit = 0;
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end_bit = chunk_size(chunk) >> order;
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retry:
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start_bit = algo(chunk->bits, end_bit, start_bit,
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nbits, data, pool, chunk->start_addr);
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if (start_bit >= end_bit)
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continue;
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remain = bitmap_set_ll(chunk->bits, start_bit, nbits);
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if (remain) {
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remain = bitmap_clear_ll(chunk->bits, start_bit,
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nbits - remain);
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BUG_ON(remain);
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goto retry;
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}
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addr = chunk->start_addr + ((unsigned long)start_bit << order);
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size = nbits << order;
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atomic_long_sub(size, &chunk->avail);
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break;
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}
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rcu_read_unlock();
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return addr;
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}
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EXPORT_SYMBOL(gen_pool_alloc_algo);
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/**
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* gen_pool_dma_alloc - allocate special memory from the pool for DMA usage
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* @pool: pool to allocate from
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* @size: number of bytes to allocate from the pool
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* @dma: dma-view physical address return value. Use NULL if unneeded.
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*
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* Allocate the requested number of bytes from the specified pool.
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* Uses the pool allocation function (with first-fit algorithm by default).
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* Can not be used in NMI handler on architectures without
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* NMI-safe cmpxchg implementation.
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*/
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void *gen_pool_dma_alloc(struct gen_pool *pool, size_t size, dma_addr_t *dma)
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{
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unsigned long vaddr;
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if (!pool)
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return NULL;
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vaddr = gen_pool_alloc(pool, size);
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if (!vaddr)
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return NULL;
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if (dma)
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*dma = gen_pool_virt_to_phys(pool, vaddr);
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return (void *)vaddr;
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}
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EXPORT_SYMBOL(gen_pool_dma_alloc);
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/**
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* gen_pool_free - free allocated special memory back to the pool
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* @pool: pool to free to
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* @addr: starting address of memory to free back to pool
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* @size: size in bytes of memory to free
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*
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* Free previously allocated special memory back to the specified
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* pool. Can not be used in NMI handler on architectures without
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* NMI-safe cmpxchg implementation.
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*/
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void gen_pool_free(struct gen_pool *pool, unsigned long addr, size_t size)
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{
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struct gen_pool_chunk *chunk;
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int order = pool->min_alloc_order;
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int start_bit, nbits, remain;
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|
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#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
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BUG_ON(in_nmi());
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#endif
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nbits = (size + (1UL << order) - 1) >> order;
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rcu_read_lock();
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list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk) {
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if (addr >= chunk->start_addr && addr <= chunk->end_addr) {
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BUG_ON(addr + size - 1 > chunk->end_addr);
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start_bit = (addr - chunk->start_addr) >> order;
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remain = bitmap_clear_ll(chunk->bits, start_bit, nbits);
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BUG_ON(remain);
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size = nbits << order;
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atomic_long_add(size, &chunk->avail);
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rcu_read_unlock();
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return;
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}
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}
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rcu_read_unlock();
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BUG();
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}
|
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EXPORT_SYMBOL(gen_pool_free);
|
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|
|
/**
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* gen_pool_for_each_chunk - call func for every chunk of generic memory pool
|
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* @pool: the generic memory pool
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* @func: func to call
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* @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,
|
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void (*func)(struct gen_pool *pool, struct gen_pool_chunk *chunk, void *data),
|
|
void *data)
|
|
{
|
|
struct gen_pool_chunk *chunk;
|
|
|
|
rcu_read_lock();
|
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list_for_each_entry_rcu(chunk, &(pool)->chunks, next_chunk)
|
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func(pool, chunk, data);
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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
|
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* @pool: the generic memory pool
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* @start: start address
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|
* @size: size of the region
|
|
*
|
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* 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,
|
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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;
|
|
}
|
|
|
|
/**
|
|
* 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_long_read(&chunk->avail);
|
|
rcu_read_unlock();
|
|
return avail;
|
|
}
|
|
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;
|
|
}
|
|
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();
|
|
}
|
|
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, unsigned long start_addr)
|
|
{
|
|
return bitmap_find_next_zero_area(map, size, start, nr, 0);
|
|
}
|
|
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, unsigned long start_addr)
|
|
{
|
|
struct genpool_data_align *alignment;
|
|
unsigned long align_mask, align_off;
|
|
int order;
|
|
|
|
alignment = data;
|
|
order = pool->min_alloc_order;
|
|
align_mask = ((alignment->align + (1UL << order) - 1) >> order) - 1;
|
|
align_off = (start_addr & (alignment->align - 1)) >> order;
|
|
|
|
return bitmap_find_next_zero_area_off(map, size, start, nr,
|
|
align_mask, align_off);
|
|
}
|
|
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, unsigned long start_addr)
|
|
{
|
|
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;
|
|
}
|
|
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 start_addr)
|
|
{
|
|
unsigned long align_mask = roundup_pow_of_two(nr) - 1;
|
|
|
|
return bitmap_find_next_zero_area(map, size, start, nr, align_mask);
|
|
}
|
|
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_addr)
|
|
{
|
|
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;
|
|
}
|
|
EXPORT_SYMBOL(gen_pool_best_fit);
|
|
|
|
static void devm_gen_pool_release(struct device *dev, void *res)
|
|
{
|
|
gen_pool_destroy(*(struct gen_pool **)res);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
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);
|
|
}
|
|
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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_gen_pool_get);
|
|
#endif /* CONFIG_OF */
|