forked from Minki/linux
2ac757e415
In case of error, the function gen_pool_create() returns NULL pointer
not ERR_PTR(). The IS_ERR() test in the return value check should be
replaced with NULL test.
Fixes: 93a7653031 ("net: ethernet: ti: introduce am65x/j721e gigabit eth subsystem driver")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
127 lines
3.1 KiB
C
127 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* TI K3 CPPI5 descriptors pool API
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*
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* Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/err.h>
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#include <linux/genalloc.h>
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#include <linux/kernel.h>
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#include "k3-cppi-desc-pool.h"
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struct k3_cppi_desc_pool {
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struct device *dev;
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dma_addr_t dma_addr;
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void *cpumem; /* dma_alloc map */
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size_t desc_size;
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size_t mem_size;
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size_t num_desc;
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struct gen_pool *gen_pool;
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};
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void k3_cppi_desc_pool_destroy(struct k3_cppi_desc_pool *pool)
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{
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if (!pool)
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return;
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WARN(gen_pool_size(pool->gen_pool) != gen_pool_avail(pool->gen_pool),
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"k3_knav_desc_pool size %zu != avail %zu",
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gen_pool_size(pool->gen_pool),
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gen_pool_avail(pool->gen_pool));
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if (pool->cpumem)
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dma_free_coherent(pool->dev, pool->mem_size, pool->cpumem,
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pool->dma_addr);
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gen_pool_destroy(pool->gen_pool); /* frees pool->name */
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}
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struct k3_cppi_desc_pool *
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k3_cppi_desc_pool_create_name(struct device *dev, size_t size,
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size_t desc_size,
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const char *name)
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{
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struct k3_cppi_desc_pool *pool;
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const char *pool_name = NULL;
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int ret = -ENOMEM;
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pool = devm_kzalloc(dev, sizeof(*pool), GFP_KERNEL);
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if (!pool)
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return ERR_PTR(ret);
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pool->dev = dev;
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pool->desc_size = roundup_pow_of_two(desc_size);
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pool->num_desc = size;
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pool->mem_size = pool->num_desc * pool->desc_size;
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pool_name = kstrdup_const(name ? name : dev_name(pool->dev),
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GFP_KERNEL);
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if (!pool_name)
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return ERR_PTR(-ENOMEM);
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pool->gen_pool = gen_pool_create(ilog2(pool->desc_size), -1);
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if (!pool->gen_pool) {
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ret = -ENOMEM;
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dev_err(pool->dev, "pool create failed %d\n", ret);
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kfree_const(pool_name);
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goto gen_pool_create_fail;
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}
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pool->gen_pool->name = pool_name;
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pool->cpumem = dma_alloc_coherent(pool->dev, pool->mem_size,
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&pool->dma_addr, GFP_KERNEL);
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if (!pool->cpumem)
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goto dma_alloc_fail;
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ret = gen_pool_add_virt(pool->gen_pool, (unsigned long)pool->cpumem,
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(phys_addr_t)pool->dma_addr, pool->mem_size,
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-1);
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if (ret < 0) {
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dev_err(pool->dev, "pool add failed %d\n", ret);
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goto gen_pool_add_virt_fail;
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}
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return pool;
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gen_pool_add_virt_fail:
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dma_free_coherent(pool->dev, pool->mem_size, pool->cpumem,
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pool->dma_addr);
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dma_alloc_fail:
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gen_pool_destroy(pool->gen_pool); /* frees pool->name */
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gen_pool_create_fail:
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devm_kfree(pool->dev, pool);
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return ERR_PTR(ret);
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}
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dma_addr_t k3_cppi_desc_pool_virt2dma(struct k3_cppi_desc_pool *pool,
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void *addr)
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{
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return addr ? pool->dma_addr + (addr - pool->cpumem) : 0;
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}
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void *k3_cppi_desc_pool_dma2virt(struct k3_cppi_desc_pool *pool, dma_addr_t dma)
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{
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return dma ? pool->cpumem + (dma - pool->dma_addr) : NULL;
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}
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void *k3_cppi_desc_pool_alloc(struct k3_cppi_desc_pool *pool)
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{
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return (void *)gen_pool_alloc(pool->gen_pool, pool->desc_size);
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}
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void k3_cppi_desc_pool_free(struct k3_cppi_desc_pool *pool, void *addr)
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{
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gen_pool_free(pool->gen_pool, (unsigned long)addr, pool->desc_size);
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}
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size_t k3_cppi_desc_pool_avail(struct k3_cppi_desc_pool *pool)
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{
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return gen_pool_avail(pool->gen_pool) / pool->desc_size;
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}
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