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@@ -312,6 +312,34 @@ retry:
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}
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EXPORT_SYMBOL(gen_pool_alloc);
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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
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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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+
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+ if (!pool)
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+ return NULL;
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+
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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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+
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+ *dma = gen_pool_virt_to_phys(pool, vaddr);
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+
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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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/**
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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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