diff options
Diffstat (limited to 'drivers/staging/ccree/ssi_buffer_mgr.c')
| -rw-r--r-- | drivers/staging/ccree/ssi_buffer_mgr.c | 537 |
1 files changed, 537 insertions, 0 deletions
diff --git a/drivers/staging/ccree/ssi_buffer_mgr.c b/drivers/staging/ccree/ssi_buffer_mgr.c new file mode 100644 index 0000000..3a74980 --- /dev/null +++ b/drivers/staging/ccree/ssi_buffer_mgr.c @@ -0,0 +1,537 @@ +/* + * Copyright (C) 2012-2017 ARM Limited or its affiliates. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/crypto.h> +#include <linux/version.h> +#include <crypto/algapi.h> +#include <crypto/authenc.h> +#include <crypto/scatterwalk.h> +#include <linux/dmapool.h> +#include <linux/dma-mapping.h> +#include <linux/crypto.h> +#include <linux/module.h> +#include <linux/platform_device.h> + +#include "ssi_buffer_mgr.h" +#include "cc_lli_defs.h" + +#define LLI_MAX_NUM_OF_DATA_ENTRIES 128 +#define LLI_MAX_NUM_OF_ASSOC_DATA_ENTRIES 4 +#define MLLI_TABLE_MIN_ALIGNMENT 4 /*Force the MLLI table to be align to uint32 */ +#define MAX_NUM_OF_BUFFERS_IN_MLLI 4 +#define MAX_NUM_OF_TOTAL_MLLI_ENTRIES (2*LLI_MAX_NUM_OF_DATA_ENTRIES + \ + LLI_MAX_NUM_OF_ASSOC_DATA_ENTRIES ) + +#ifdef CC_DEBUG +#define DUMP_SGL(sg) \ + while (sg) { \ + SSI_LOG_DEBUG("page=%lu offset=%u length=%u (dma_len=%u) " \ + "dma_addr=%08x\n", (sg)->page_link, (sg)->offset, \ + (sg)->length, sg_dma_len(sg), (sg)->dma_address); \ + (sg) = sg_next(sg); \ + } +#define DUMP_MLLI_TABLE(mlli_p, nents) \ + do { \ + SSI_LOG_DEBUG("mlli=%pK nents=%u\n", (mlli_p), (nents)); \ + while((nents)--) { \ + SSI_LOG_DEBUG("addr=0x%08X size=0x%08X\n", \ + (mlli_p)[LLI_WORD0_OFFSET], \ + (mlli_p)[LLI_WORD1_OFFSET]); \ + (mlli_p) += LLI_ENTRY_WORD_SIZE; \ + } \ + } while (0) +#define GET_DMA_BUFFER_TYPE(buff_type) ( \ + ((buff_type) == SSI_DMA_BUF_NULL) ? "BUF_NULL" : \ + ((buff_type) == SSI_DMA_BUF_DLLI) ? "BUF_DLLI" : \ + ((buff_type) == SSI_DMA_BUF_MLLI) ? "BUF_MLLI" : "BUF_INVALID") +#else +#define DX_BUFFER_MGR_DUMP_SGL(sg) +#define DX_BUFFER_MGR_DUMP_MLLI_TABLE(mlli_p, nents) +#define GET_DMA_BUFFER_TYPE(buff_type) +#endif + + +enum dma_buffer_type { + DMA_NULL_TYPE = -1, + DMA_SGL_TYPE = 1, + DMA_BUFF_TYPE = 2, +}; + +struct buff_mgr_handle { + struct dma_pool *mlli_buffs_pool; +}; + +union buffer_array_entry { + struct scatterlist *sgl; + dma_addr_t buffer_dma; +}; + +struct buffer_array { + unsigned int num_of_buffers; + union buffer_array_entry entry[MAX_NUM_OF_BUFFERS_IN_MLLI]; + unsigned int offset[MAX_NUM_OF_BUFFERS_IN_MLLI]; + int nents[MAX_NUM_OF_BUFFERS_IN_MLLI]; + int total_data_len[MAX_NUM_OF_BUFFERS_IN_MLLI]; + enum dma_buffer_type type[MAX_NUM_OF_BUFFERS_IN_MLLI]; + bool is_last[MAX_NUM_OF_BUFFERS_IN_MLLI]; + uint32_t * mlli_nents[MAX_NUM_OF_BUFFERS_IN_MLLI]; +}; + +#ifdef CC_DMA_48BIT_SIM +dma_addr_t ssi_buff_mgr_update_dma_addr(dma_addr_t orig_addr, uint32_t data_len) +{ + dma_addr_t tmp_dma_addr; +#ifdef CC_DMA_48BIT_SIM_FULL + /* With this code all addresses will be switched to 48 bits. */ + /* The if condition protects from double expention */ + if((((orig_addr >> 16) & 0xFFFF) != 0xFFFF) && + (data_len <= CC_MAX_MLLI_ENTRY_SIZE)) { +#else + if((!(((orig_addr >> 16) & 0xFF) % 2)) && + (data_len <= CC_MAX_MLLI_ENTRY_SIZE)) { +#endif + tmp_dma_addr = ((orig_addr<<16) | 0xFFFF0000 | + (orig_addr & UINT16_MAX)); + SSI_LOG_DEBUG("MAP DMA: orig address=0x%llX " + "dma_address=0x%llX\n", + orig_addr, tmp_dma_addr); + return tmp_dma_addr; + } + return orig_addr; +} + +dma_addr_t ssi_buff_mgr_restore_dma_addr(dma_addr_t orig_addr) +{ + dma_addr_t tmp_dma_addr; +#ifdef CC_DMA_48BIT_SIM_FULL + /* With this code all addresses will be restored from 48 bits. */ + /* The if condition protects from double restoring */ + if((orig_addr >> 32) & 0xFFFF ) { +#else + if(((orig_addr >> 32) & 0xFFFF) && + !(((orig_addr >> 32) & 0xFF) % 2) ) { +#endif + /*return high 16 bits*/ + tmp_dma_addr = ((orig_addr >> 16)); + /*clean the 0xFFFF in the lower bits (set in the add expansion)*/ + tmp_dma_addr &= 0xFFFF0000; + /* Set the original 16 bits */ + tmp_dma_addr |= (orig_addr & UINT16_MAX); + SSI_LOG_DEBUG("Release DMA: orig address=0x%llX " + "dma_address=0x%llX\n", + orig_addr, tmp_dma_addr); + return tmp_dma_addr; + } + return orig_addr; +} +#endif +/** + * ssi_buffer_mgr_get_sgl_nents() - Get scatterlist number of entries. + * + * @sg_list: SG list + * @nbytes: [IN] Total SGL data bytes. + * @lbytes: [OUT] Returns the amount of bytes at the last entry + */ +static unsigned int ssi_buffer_mgr_get_sgl_nents( + struct scatterlist *sg_list, unsigned int nbytes, uint32_t *lbytes, bool *is_chained) +{ + unsigned int nents = 0; + while (nbytes != 0) { + if (sg_is_chain(sg_list)) { + SSI_LOG_ERR("Unexpected chanined entry " + "in sg (entry =0x%X) \n", nents); + BUG(); + } + if (sg_list->length != 0) { + nents++; + /* get the number of bytes in the last entry */ + *lbytes = nbytes; + nbytes -= ( sg_list->length > nbytes ) ? nbytes : sg_list->length; + sg_list = sg_next(sg_list); + } else { + sg_list = (struct scatterlist *)sg_page(sg_list); + if (is_chained != NULL) { + *is_chained = true; + } + } + } + SSI_LOG_DEBUG("nents %d last bytes %d\n",nents, *lbytes); + return nents; +} + +/** + * ssi_buffer_mgr_zero_sgl() - Zero scatter scatter list data. + * + * @sgl: + */ +void ssi_buffer_mgr_zero_sgl(struct scatterlist *sgl, uint32_t data_len) +{ + struct scatterlist *current_sg = sgl; + int sg_index = 0; + + while (sg_index <= data_len) { + if (current_sg == NULL) { + /* reached the end of the sgl --> just return back */ + return; + } + memset(sg_virt(current_sg), 0, current_sg->length); + sg_index += current_sg->length; + current_sg = sg_next(current_sg); + } +} + +/** + * ssi_buffer_mgr_copy_scatterlist_portion() - Copy scatter list data, + * from to_skip to end, to dest and vice versa + * + * @dest: + * @sg: + * @to_skip: + * @end: + * @direct: + */ +void ssi_buffer_mgr_copy_scatterlist_portion( + u8 *dest, struct scatterlist *sg, + uint32_t to_skip, uint32_t end, + enum ssi_sg_cpy_direct direct) +{ + uint32_t nents, lbytes; + + nents = ssi_buffer_mgr_get_sgl_nents(sg, end, &lbytes, NULL); + sg_copy_buffer(sg, nents, (void *)dest, (end - to_skip), 0, (direct == SSI_SG_TO_BUF)); +} + +static inline int ssi_buffer_mgr_render_buff_to_mlli( + dma_addr_t buff_dma, uint32_t buff_size, uint32_t *curr_nents, + uint32_t **mlli_entry_pp) +{ + uint32_t *mlli_entry_p = *mlli_entry_pp; + uint32_t new_nents;; + + /* Verify there is no memory overflow*/ + new_nents = (*curr_nents + buff_size/CC_MAX_MLLI_ENTRY_SIZE + 1); + if (new_nents > MAX_NUM_OF_TOTAL_MLLI_ENTRIES ) { + return -ENOMEM; + } + + /*handle buffer longer than 64 kbytes */ + while (buff_size > CC_MAX_MLLI_ENTRY_SIZE ) { + SSI_UPDATE_DMA_ADDR_TO_48BIT(buff_dma, CC_MAX_MLLI_ENTRY_SIZE); + LLI_SET_ADDR(mlli_entry_p,buff_dma); + LLI_SET_SIZE(mlli_entry_p, CC_MAX_MLLI_ENTRY_SIZE); + SSI_LOG_DEBUG("entry[%d]: single_buff=0x%08X size=%08X\n",*curr_nents, + mlli_entry_p[LLI_WORD0_OFFSET], + mlli_entry_p[LLI_WORD1_OFFSET]); + SSI_RESTORE_DMA_ADDR_TO_48BIT(buff_dma); + buff_dma += CC_MAX_MLLI_ENTRY_SIZE; + buff_size -= CC_MAX_MLLI_ENTRY_SIZE; + mlli_entry_p = mlli_entry_p + 2; + (*curr_nents)++; + } + /*Last entry */ + SSI_UPDATE_DMA_ADDR_TO_48BIT(buff_dma, buff_size); + LLI_SET_ADDR(mlli_entry_p,buff_dma); + LLI_SET_SIZE(mlli_entry_p, buff_size); + SSI_LOG_DEBUG("entry[%d]: single_buff=0x%08X size=%08X\n",*curr_nents, + mlli_entry_p[LLI_WORD0_OFFSET], + mlli_entry_p[LLI_WORD1_OFFSET]); + mlli_entry_p = mlli_entry_p + 2; + *mlli_entry_pp = mlli_entry_p; + (*curr_nents)++; + return 0; +} + + +static inline int ssi_buffer_mgr_render_scatterlist_to_mlli( + struct scatterlist *sgl, uint32_t sgl_data_len, uint32_t sglOffset, uint32_t *curr_nents, + uint32_t **mlli_entry_pp) +{ + struct scatterlist *curr_sgl = sgl; + uint32_t *mlli_entry_p = *mlli_entry_pp; + int32_t rc = 0; + + for ( ; (curr_sgl != NULL) && (sgl_data_len != 0); + curr_sgl = sg_next(curr_sgl)) { + uint32_t entry_data_len = + (sgl_data_len > sg_dma_len(curr_sgl) - sglOffset) ? + sg_dma_len(curr_sgl) - sglOffset : sgl_data_len ; + sgl_data_len -= entry_data_len; + rc = ssi_buffer_mgr_render_buff_to_mlli( + sg_dma_address(curr_sgl) + sglOffset, entry_data_len, curr_nents, + &mlli_entry_p); + if(rc != 0) { + return rc; + } + sglOffset=0; + } + *mlli_entry_pp = mlli_entry_p; + return 0; +} + +static int ssi_buffer_mgr_generate_mlli ( + struct device *dev, + struct buffer_array *sg_data, + struct mlli_params *mlli_params) __maybe_unused; + +static int ssi_buffer_mgr_generate_mlli( + struct device *dev, + struct buffer_array *sg_data, + struct mlli_params *mlli_params) +{ + uint32_t *mlli_p; + uint32_t total_nents = 0,prev_total_nents = 0; + int rc = 0, i; + + SSI_LOG_DEBUG("NUM of SG's = %d\n", sg_data->num_of_buffers); + + /* Allocate memory from the pointed pool */ + mlli_params->mlli_virt_addr = dma_pool_alloc( + mlli_params->curr_pool, GFP_KERNEL, + &(mlli_params->mlli_dma_addr)); + if (unlikely(mlli_params->mlli_virt_addr == NULL)) { + SSI_LOG_ERR("dma_pool_alloc() failed\n"); + rc =-ENOMEM; + goto build_mlli_exit; + } + SSI_UPDATE_DMA_ADDR_TO_48BIT(mlli_params->mlli_dma_addr, + (MAX_NUM_OF_TOTAL_MLLI_ENTRIES* + LLI_ENTRY_BYTE_SIZE)); + /* Point to start of MLLI */ + mlli_p = (uint32_t *)mlli_params->mlli_virt_addr; + /* go over all SG's and link it to one MLLI table */ + for (i = 0; i < sg_data->num_of_buffers; i++) { + if (sg_data->type[i] == DMA_SGL_TYPE) + rc = ssi_buffer_mgr_render_scatterlist_to_mlli( + sg_data->entry[i].sgl, + sg_data->total_data_len[i], sg_data->offset[i], &total_nents, + &mlli_p); + else /*DMA_BUFF_TYPE*/ + rc = ssi_buffer_mgr_render_buff_to_mlli( + sg_data->entry[i].buffer_dma, + sg_data->total_data_len[i], &total_nents, + &mlli_p); + if(rc != 0) { + return rc; + } + + /* set last bit in the current table */ + if (sg_data->mlli_nents[i] != NULL) { + /*Calculate the current MLLI table length for the + length field in the descriptor*/ + *(sg_data->mlli_nents[i]) += + (total_nents - prev_total_nents); + prev_total_nents = total_nents; + } + } + + /* Set MLLI size for the bypass operation */ + mlli_params->mlli_len = (total_nents * LLI_ENTRY_BYTE_SIZE); + + SSI_LOG_DEBUG("MLLI params: " + "virt_addr=%pK dma_addr=0x%llX mlli_len=0x%X\n", + mlli_params->mlli_virt_addr, + (unsigned long long)mlli_params->mlli_dma_addr, + mlli_params->mlli_len); + +build_mlli_exit: + return rc; +} + +static inline void ssi_buffer_mgr_add_buffer_entry( + struct buffer_array *sgl_data, + dma_addr_t buffer_dma, unsigned int buffer_len, + bool is_last_entry, uint32_t *mlli_nents) +{ + unsigned int index = sgl_data->num_of_buffers; + + SSI_LOG_DEBUG("index=%u single_buff=0x%llX " + "buffer_len=0x%08X is_last=%d\n", + index, (unsigned long long)buffer_dma, buffer_len, is_last_entry); + sgl_data->nents[index] = 1; + sgl_data->entry[index].buffer_dma = buffer_dma; + sgl_data->offset[index] = 0; + sgl_data->total_data_len[index] = buffer_len; + sgl_data->type[index] = DMA_BUFF_TYPE; + sgl_data->is_last[index] = is_last_entry; + sgl_data->mlli_nents[index] = mlli_nents; + if (sgl_data->mlli_nents[index] != NULL) + *sgl_data->mlli_nents[index] = 0; + sgl_data->num_of_buffers++; +} + +static inline void ssi_buffer_mgr_add_scatterlist_entry( + struct buffer_array *sgl_data, + unsigned int nents, + struct scatterlist *sgl, + unsigned int data_len, + unsigned int data_offset, + bool is_last_table, + uint32_t *mlli_nents) +{ + unsigned int index = sgl_data->num_of_buffers; + + SSI_LOG_DEBUG("index=%u nents=%u sgl=%pK data_len=0x%08X is_last=%d\n", + index, nents, sgl, data_len, is_last_table); + sgl_data->nents[index] = nents; + sgl_data->entry[index].sgl = sgl; + sgl_data->offset[index] = data_offset; + sgl_data->total_data_len[index] = data_len; + sgl_data->type[index] = DMA_SGL_TYPE; + sgl_data->is_last[index] = is_last_table; + sgl_data->mlli_nents[index] = mlli_nents; + if (sgl_data->mlli_nents[index] != NULL) + *sgl_data->mlli_nents[index] = 0; + sgl_data->num_of_buffers++; +} + +static int +ssi_buffer_mgr_dma_map_sg(struct device *dev, struct scatterlist *sg, uint32_t nents, + enum dma_data_direction direction) +{ + uint32_t i , j; + struct scatterlist *l_sg = sg; + for (i = 0; i < nents; i++) { + if (l_sg == NULL) { + break; + } + if (unlikely(dma_map_sg(dev, l_sg, 1, direction) != 1)){ + SSI_LOG_ERR("dma_map_page() sg buffer failed\n"); + goto err; + } + l_sg = sg_next(l_sg); + } + return nents; + +err: + /* Restore mapped parts */ + for (j = 0; j < i; j++) { + if (sg == NULL) { + break; + } + dma_unmap_sg(dev,sg,1,direction); + sg = sg_next(sg); + } + return 0; +} + +static int ssi_buffer_mgr_map_scatterlist (struct device *dev, + struct scatterlist *sg, unsigned int nbytes, int direction, + uint32_t *nents, uint32_t max_sg_nents, uint32_t *lbytes, + uint32_t *mapped_nents) __maybe_unused; + +static int ssi_buffer_mgr_map_scatterlist( + struct device *dev, struct scatterlist *sg, + unsigned int nbytes, int direction, + uint32_t *nents, uint32_t max_sg_nents, + uint32_t *lbytes, uint32_t *mapped_nents) +{ + bool is_chained = false; + + if (sg_is_last(sg)) { + /* One entry only case -set to DLLI */ + if (unlikely(dma_map_sg(dev, sg, 1, direction) != 1)) { + SSI_LOG_ERR("dma_map_sg() single buffer failed\n"); + return -ENOMEM; + } + SSI_LOG_DEBUG("Mapped sg: dma_address=0x%llX " + "page_link=0x%08lX addr=%pK offset=%u " + "length=%u\n", + (unsigned long long)sg_dma_address(sg), + sg->page_link, + sg_virt(sg), + sg->offset, sg->length); + *lbytes = nbytes; + *nents = 1; + *mapped_nents = 1; + SSI_UPDATE_DMA_ADDR_TO_48BIT(sg_dma_address(sg), sg_dma_len(sg)); + } else { /*sg_is_last*/ + *nents = ssi_buffer_mgr_get_sgl_nents(sg, nbytes, lbytes, + &is_chained); + if (*nents > max_sg_nents) { + *nents = 0; + SSI_LOG_ERR("Too many fragments. current %d max %d\n", + *nents, max_sg_nents); + return -ENOMEM; + } + if (!is_chained) { + /* In case of mmu the number of mapped nents might + be changed from the original sgl nents */ + *mapped_nents = dma_map_sg(dev, sg, *nents, direction); + if (unlikely(*mapped_nents == 0)){ + *nents = 0; + SSI_LOG_ERR("dma_map_sg() sg buffer failed\n"); + return -ENOMEM; + } + } else { + /*In this case the driver maps entry by entry so it + must have the same nents before and after map */ + *mapped_nents = ssi_buffer_mgr_dma_map_sg(dev, + sg, + *nents, + direction); + if (unlikely(*mapped_nents != *nents)){ + *nents = *mapped_nents; + SSI_LOG_ERR("dma_map_sg() sg buffer failed\n"); + return -ENOMEM; + } + } + } + + return 0; +} + +int ssi_buffer_mgr_init(struct ssi_drvdata *drvdata) +{ + struct buff_mgr_handle *buff_mgr_handle; + struct device *dev = &drvdata->plat_dev->dev; + + buff_mgr_handle = (struct buff_mgr_handle *) + kmalloc(sizeof(struct buff_mgr_handle), GFP_KERNEL); + if (buff_mgr_handle == NULL) + return -ENOMEM; + + drvdata->buff_mgr_handle = buff_mgr_handle; + + buff_mgr_handle->mlli_buffs_pool = dma_pool_create( + "dx_single_mlli_tables", dev, + MAX_NUM_OF_TOTAL_MLLI_ENTRIES * + LLI_ENTRY_BYTE_SIZE, + MLLI_TABLE_MIN_ALIGNMENT, 0); + + if (unlikely(buff_mgr_handle->mlli_buffs_pool == NULL)) + goto error; + + return 0; + +error: + ssi_buffer_mgr_fini(drvdata); + return -ENOMEM; +} + +int ssi_buffer_mgr_fini(struct ssi_drvdata *drvdata) +{ + struct buff_mgr_handle *buff_mgr_handle = drvdata->buff_mgr_handle; + + if (buff_mgr_handle != NULL) { + if (buff_mgr_handle->mlli_buffs_pool != NULL) + dma_pool_destroy(buff_mgr_handle->mlli_buffs_pool); + kfree(drvdata->buff_mgr_handle); + drvdata->buff_mgr_handle = NULL; + + } + return 0; +} + |
