linux-4.4.1/rmem_cma_setup() の履歴(No.2)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-4.4.1/rmem_cma_setup() へ行く。
  • 1 (2016-03-02 (水) 11:37:24)
  • 2 (2016-03-02 (水) 13:13:01)

参照元†

• linux-4.4.1/__of_table_cma(global)

説明†

• パス: linux-4.4.1/drivers/base/dma-contiguous.c

• FIXME: これは何？
  • 説明

引数†

• struct reserved_mem *rmem
  • linux-4.4.1/reserved_mem

返り値†

• int

参考†

実装†

static int __init rmem_cma_setup(struct reserved_mem *rmem)
{
        phys_addr_t align = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order);
        phys_addr_t mask = align - 1;
        unsigned long node = rmem->fdt_node;
        struct cma *cma;
        int err;

• • linux-4.4.1/phys_addr_t
  • linux-4.4.1/PAGE_SIZE
  • linux-4.4.1/max()
  • linux-4.4.1/MAX_ORDER
  • linux-4.4.1/pageblock_order(global)
  • linux-4.4.1/cma

        if (!of_get_flat_dt_prop(node, "reusable", NULL) ||
            of_get_flat_dt_prop(node, "no-map", NULL))
                return -EINVAL;

• • linux-4.4.1/of_get_flat_dt_prop()

        if ((rmem->base & mask) || (rmem->size & mask)) {
                pr_err("Reserved memory: incorrect alignment of CMA region\n");
                return -EINVAL;
        }

• • linux-4.4.1/pr_err()

        err = cma_init_reserved_mem(rmem->base, rmem->size, 0, &cma);
        if (err) {
                pr_err("Reserved memory: unable to setup CMA region\n");
                return err;
        }
        /* Architecture specific contiguous memory fixup. */
        dma_contiguous_early_fixup(rmem->base, rmem->size);

• • linux-4.4.1/cma_init_reserved_mem()
  • linux-4.4.1/dma_contiguous_early_fixup()

        if (of_get_flat_dt_prop(node, "linux,cma-default", NULL))
                dma_contiguous_set_default(cma);

• • linux-4.4.1/dma_contiguous_set_default()

        rmem->ops = &rmem_cma_ops;
        rmem->priv = cma;

• • linux-4.4.1/rmem_cma_ops(global)

        pr_info("Reserved memory: created CMA memory pool at %pa, size %ld MiB\n",
                &rmem->base, (unsigned long)rmem->size / SZ_1M);

• • linux-4.4.1/pr_info()
  • linux-4.4.1/SZ_1M

        return 0;
}
RESERVEDMEM_OF_DECLARE(cma, "shared-dma-pool", rmem_cma_setup);

• • linux-4.4.1/RESERVEDMEM_OF_DECLARE()
  • linux-4.4.1/__of_table_cma(global)

コメント†