diff options
author | Zhou Wang <wangzhou1@hisilicon.com> | 2019-08-02 15:57:51 +0800 |
---|---|---|
committer | Herbert Xu <herbert@gondor.apana.org.au> | 2019-08-09 15:11:53 +1000 |
commit | dfed0098ab91f647b5720ab6f1e03b5b55139408 (patch) | |
tree | 7e195fc299279dd885b41527ee4bb003951a09a6 /drivers/crypto | |
parent | 263c9959c9376ec0217d6adc61222a53469eed3c (diff) | |
download | linux-dfed0098ab91f647b5720ab6f1e03b5b55139408.tar.bz2 |
crypto: hisilicon - add hardware SGL support
HiSilicon accelerators in Hip08 use same hardware scatterlist for data format.
We support it in this module.
Specific accelerator drivers can use hisi_acc_create_sgl_pool to allocate
hardware SGLs ahead. Then use hisi_acc_sg_buf_map_to_hw_sgl to get one
hardware SGL and pass related information to hardware SGL.
The DMA address of mapped hardware SGL can be passed to SGL src/dst field
in QM SQE.
Signed-off-by: Zhou Wang <wangzhou1@hisilicon.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto')
-rw-r--r-- | drivers/crypto/hisilicon/Kconfig | 8 | ||||
-rw-r--r-- | drivers/crypto/hisilicon/Makefile | 1 | ||||
-rw-r--r-- | drivers/crypto/hisilicon/sgl.c | 214 | ||||
-rw-r--r-- | drivers/crypto/hisilicon/sgl.h | 24 |
4 files changed, 247 insertions, 0 deletions
diff --git a/drivers/crypto/hisilicon/Kconfig b/drivers/crypto/hisilicon/Kconfig index b79be8dc78e7..457d9bcb0d4e 100644 --- a/drivers/crypto/hisilicon/Kconfig +++ b/drivers/crypto/hisilicon/Kconfig @@ -19,3 +19,11 @@ config CRYPTO_DEV_HISI_QM help HiSilicon accelerator engines use a common queue management interface. Specific engine driver may use this module. + +config CRYPTO_HISI_SGL + tristate + depends on ARM64 + help + HiSilicon accelerator engines use a common hardware scatterlist + interface for data format. Specific engine driver may use this + module. diff --git a/drivers/crypto/hisilicon/Makefile b/drivers/crypto/hisilicon/Makefile index 05e9052e0f52..96cb9134194e 100644 --- a/drivers/crypto/hisilicon/Makefile +++ b/drivers/crypto/hisilicon/Makefile @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_CRYPTO_DEV_HISI_SEC) += sec/ obj-$(CONFIG_CRYPTO_DEV_HISI_QM) += qm.o +obj-$(CONFIG_CRYPTO_HISI_SGL) += sgl.o diff --git a/drivers/crypto/hisilicon/sgl.c b/drivers/crypto/hisilicon/sgl.c new file mode 100644 index 000000000000..8ef7679a365e --- /dev/null +++ b/drivers/crypto/hisilicon/sgl.c @@ -0,0 +1,214 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2019 HiSilicon Limited. */ +#include <linux/dma-mapping.h> +#include <linux/module.h> +#include "./sgl.h" + +#define HISI_ACC_SGL_SGE_NR_MIN 1 +#define HISI_ACC_SGL_SGE_NR_MAX 255 +#define HISI_ACC_SGL_SGE_NR_DEF 10 +#define HISI_ACC_SGL_NR_MAX 256 +#define HISI_ACC_SGL_ALIGN_SIZE 64 + +static int acc_sgl_sge_set(const char *val, const struct kernel_param *kp) +{ + int ret; + u32 n; + + if (!val) + return -EINVAL; + + ret = kstrtou32(val, 10, &n); + if (ret != 0 || n > HISI_ACC_SGL_SGE_NR_MAX || n == 0) + return -EINVAL; + + return param_set_int(val, kp); +} + +static const struct kernel_param_ops acc_sgl_sge_ops = { + .set = acc_sgl_sge_set, + .get = param_get_int, +}; + +static u32 acc_sgl_sge_nr = HISI_ACC_SGL_SGE_NR_DEF; +module_param_cb(acc_sgl_sge_nr, &acc_sgl_sge_ops, &acc_sgl_sge_nr, 0444); +MODULE_PARM_DESC(acc_sgl_sge_nr, "Number of sge in sgl(1-255)"); + +struct acc_hw_sge { + dma_addr_t buf; + void *page_ctrl; + __le32 len; + __le32 pad; + __le32 pad0; + __le32 pad1; +}; + +/* use default sgl head size 64B */ +struct hisi_acc_hw_sgl { + dma_addr_t next_dma; + __le16 entry_sum_in_chain; + __le16 entry_sum_in_sgl; + __le16 entry_length_in_sgl; + __le16 pad0; + __le64 pad1[5]; + struct hisi_acc_hw_sgl *next; + struct acc_hw_sge sge_entries[]; +} __aligned(1); + +/** + * hisi_acc_create_sgl_pool() - Create a hw sgl pool. + * @dev: The device which hw sgl pool belongs to. + * @pool: Pointer of pool. + * @count: Count of hisi_acc_hw_sgl in pool. + * + * This function creates a hw sgl pool, after this user can get hw sgl memory + * from it. + */ +int hisi_acc_create_sgl_pool(struct device *dev, + struct hisi_acc_sgl_pool *pool, u32 count) +{ + u32 sgl_size; + u32 size; + + if (!dev || !pool || !count) + return -EINVAL; + + sgl_size = sizeof(struct acc_hw_sge) * acc_sgl_sge_nr + + sizeof(struct hisi_acc_hw_sgl); + size = sgl_size * count; + + pool->sgl = dma_alloc_coherent(dev, size, &pool->sgl_dma, GFP_KERNEL); + if (!pool->sgl) + return -ENOMEM; + + pool->size = size; + pool->count = count; + pool->sgl_size = sgl_size; + + return 0; +} +EXPORT_SYMBOL_GPL(hisi_acc_create_sgl_pool); + +/** + * hisi_acc_free_sgl_pool() - Free a hw sgl pool. + * @dev: The device which hw sgl pool belongs to. + * @pool: Pointer of pool. + * + * This function frees memory of a hw sgl pool. + */ +void hisi_acc_free_sgl_pool(struct device *dev, struct hisi_acc_sgl_pool *pool) +{ + dma_free_coherent(dev, pool->size, pool->sgl, pool->sgl_dma); + memset(pool, 0, sizeof(struct hisi_acc_sgl_pool)); +} +EXPORT_SYMBOL_GPL(hisi_acc_free_sgl_pool); + +struct hisi_acc_hw_sgl *acc_get_sgl(struct hisi_acc_sgl_pool *pool, u32 index, + dma_addr_t *hw_sgl_dma) +{ + if (!pool || !hw_sgl_dma || index >= pool->count || !pool->sgl) + return ERR_PTR(-EINVAL); + + *hw_sgl_dma = pool->sgl_dma + pool->sgl_size * index; + return (void *)pool->sgl + pool->sgl_size * index; +} + +void acc_put_sgl(struct hisi_acc_sgl_pool *pool, u32 index) {} + +static void sg_map_to_hw_sg(struct scatterlist *sgl, + struct acc_hw_sge *hw_sge) +{ + hw_sge->buf = sgl->dma_address; + hw_sge->len = sgl->dma_length; +} + +static void inc_hw_sgl_sge(struct hisi_acc_hw_sgl *hw_sgl) +{ + hw_sgl->entry_sum_in_sgl++; +} + +static void update_hw_sgl_sum_sge(struct hisi_acc_hw_sgl *hw_sgl, u16 sum) +{ + hw_sgl->entry_sum_in_chain = sum; +} + +/** + * hisi_acc_sg_buf_map_to_hw_sgl - Map a scatterlist to a hw sgl. + * @dev: The device which hw sgl belongs to. + * @sgl: Scatterlist which will be mapped to hw sgl. + * @pool: Pool which hw sgl memory will be allocated in. + * @index: Index of hisi_acc_hw_sgl in pool. + * @hw_sgl_dma: The dma address of allocated hw sgl. + * + * This function builds hw sgl according input sgl, user can use hw_sgl_dma + * as src/dst in its BD. Only support single hw sgl currently. + */ +struct hisi_acc_hw_sgl * +hisi_acc_sg_buf_map_to_hw_sgl(struct device *dev, + struct scatterlist *sgl, + struct hisi_acc_sgl_pool *pool, + u32 index, dma_addr_t *hw_sgl_dma) +{ + struct hisi_acc_hw_sgl *curr_hw_sgl; + dma_addr_t curr_sgl_dma; + struct acc_hw_sge *curr_hw_sge; + struct scatterlist *sg; + int sg_n = sg_nents(sgl); + int i, ret; + + if (!dev || !sgl || !pool || !hw_sgl_dma || sg_n > acc_sgl_sge_nr) + return ERR_PTR(-EINVAL); + + ret = dma_map_sg(dev, sgl, sg_n, DMA_BIDIRECTIONAL); + if (!ret) + return ERR_PTR(-EINVAL); + + curr_hw_sgl = acc_get_sgl(pool, index, &curr_sgl_dma); + if (!curr_hw_sgl) { + ret = -ENOMEM; + goto err_unmap_sg; + } + curr_hw_sgl->entry_length_in_sgl = acc_sgl_sge_nr; + curr_hw_sge = curr_hw_sgl->sge_entries; + + for_each_sg(sgl, sg, sg_n, i) { + sg_map_to_hw_sg(sg, curr_hw_sge); + inc_hw_sgl_sge(curr_hw_sgl); + curr_hw_sge++; + } + + update_hw_sgl_sum_sge(curr_hw_sgl, acc_sgl_sge_nr); + *hw_sgl_dma = curr_sgl_dma; + + return curr_hw_sgl; + +err_unmap_sg: + dma_unmap_sg(dev, sgl, sg_n, DMA_BIDIRECTIONAL); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(hisi_acc_sg_buf_map_to_hw_sgl); + +/** + * hisi_acc_sg_buf_unmap() - Unmap allocated hw sgl. + * @dev: The device which hw sgl belongs to. + * @sgl: Related scatterlist. + * @hw_sgl: Virtual address of hw sgl. + * @hw_sgl_dma: DMA address of hw sgl. + * @pool: Pool which hw sgl is allocated in. + * + * This function unmaps allocated hw sgl. + */ +void hisi_acc_sg_buf_unmap(struct device *dev, struct scatterlist *sgl, + struct hisi_acc_hw_sgl *hw_sgl) +{ + dma_unmap_sg(dev, sgl, sg_nents(sgl), DMA_BIDIRECTIONAL); + + hw_sgl->entry_sum_in_chain = 0; + hw_sgl->entry_sum_in_sgl = 0; + hw_sgl->entry_length_in_sgl = 0; +} +EXPORT_SYMBOL_GPL(hisi_acc_sg_buf_unmap); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Zhou Wang <wangzhou1@hisilicon.com>"); +MODULE_DESCRIPTION("HiSilicon Accelerator SGL support"); diff --git a/drivers/crypto/hisilicon/sgl.h b/drivers/crypto/hisilicon/sgl.h new file mode 100644 index 000000000000..3ac8871c7acf --- /dev/null +++ b/drivers/crypto/hisilicon/sgl.h @@ -0,0 +1,24 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (c) 2019 HiSilicon Limited. */ +#ifndef HISI_ACC_SGL_H +#define HISI_ACC_SGL_H + +struct hisi_acc_sgl_pool { + struct hisi_acc_hw_sgl *sgl; + dma_addr_t sgl_dma; + size_t size; + u32 count; + size_t sgl_size; +}; + +struct hisi_acc_hw_sgl * +hisi_acc_sg_buf_map_to_hw_sgl(struct device *dev, + struct scatterlist *sgl, + struct hisi_acc_sgl_pool *pool, + u32 index, dma_addr_t *hw_sgl_dma); +void hisi_acc_sg_buf_unmap(struct device *dev, struct scatterlist *sgl, + struct hisi_acc_hw_sgl *hw_sgl); +int hisi_acc_create_sgl_pool(struct device *dev, struct hisi_acc_sgl_pool *pool, + u32 count); +void hisi_acc_free_sgl_pool(struct device *dev, struct hisi_acc_sgl_pool *pool); +#endif |