1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2012-2019 ARM Limited (or its affiliates). */
3 
4 #include <crypto/internal/aead.h>
5 #include <crypto/authenc.h>
6 #include <crypto/scatterwalk.h>
7 #include <linux/dmapool.h>
8 #include <linux/dma-mapping.h>
9 
10 #include "cc_buffer_mgr.h"
11 #include "cc_lli_defs.h"
12 #include "cc_cipher.h"
13 #include "cc_hash.h"
14 #include "cc_aead.h"
15 
16 union buffer_array_entry {
17 	struct scatterlist *sgl;
18 	dma_addr_t buffer_dma;
19 };
20 
21 struct buffer_array {
22 	unsigned int num_of_buffers;
23 	union buffer_array_entry entry[MAX_NUM_OF_BUFFERS_IN_MLLI];
24 	unsigned int offset[MAX_NUM_OF_BUFFERS_IN_MLLI];
25 	int nents[MAX_NUM_OF_BUFFERS_IN_MLLI];
26 	int total_data_len[MAX_NUM_OF_BUFFERS_IN_MLLI];
27 	bool is_last[MAX_NUM_OF_BUFFERS_IN_MLLI];
28 	u32 *mlli_nents[MAX_NUM_OF_BUFFERS_IN_MLLI];
29 };
30 
31 static inline char *cc_dma_buf_type(enum cc_req_dma_buf_type type)
32 {
33 	switch (type) {
34 	case CC_DMA_BUF_NULL:
35 		return "BUF_NULL";
36 	case CC_DMA_BUF_DLLI:
37 		return "BUF_DLLI";
38 	case CC_DMA_BUF_MLLI:
39 		return "BUF_MLLI";
40 	default:
41 		return "BUF_INVALID";
42 	}
43 }
44 
45 /**
46  * cc_copy_mac() - Copy MAC to temporary location
47  *
48  * @dev: device object
49  * @req: aead request object
50  * @dir: [IN] copy from/to sgl
51  */
52 static void cc_copy_mac(struct device *dev, struct aead_request *req,
53 			enum cc_sg_cpy_direct dir)
54 {
55 	struct aead_req_ctx *areq_ctx = aead_request_ctx(req);
56 	u32 skip = req->assoclen + req->cryptlen;
57 
58 	cc_copy_sg_portion(dev, areq_ctx->backup_mac, req->src,
59 			   (skip - areq_ctx->req_authsize), skip, dir);
60 }
61 
62 /**
63  * cc_get_sgl_nents() - Get scatterlist number of entries.
64  *
65  * @dev: Device object
66  * @sg_list: SG list
67  * @nbytes: [IN] Total SGL data bytes.
68  * @lbytes: [OUT] Returns the amount of bytes at the last entry
69  *
70  * Return:
71  * Number of entries in the scatterlist
72  */
73 static unsigned int cc_get_sgl_nents(struct device *dev,
74 				     struct scatterlist *sg_list,
75 				     unsigned int nbytes, u32 *lbytes)
76 {
77 	unsigned int nents = 0;
78 
79 	*lbytes = 0;
80 
81 	while (nbytes && sg_list) {
82 		nents++;
83 		/* get the number of bytes in the last entry */
84 		*lbytes = nbytes;
85 		nbytes -= (sg_list->length > nbytes) ?
86 				nbytes : sg_list->length;
87 		sg_list = sg_next(sg_list);
88 	}
89 
90 	dev_dbg(dev, "nents %d last bytes %d\n", nents, *lbytes);
91 	return nents;
92 }
93 
94 /**
95  * cc_copy_sg_portion() - Copy scatter list data,
96  * from to_skip to end, to dest and vice versa
97  *
98  * @dev: Device object
99  * @dest: Buffer to copy to/from
100  * @sg: SG list
101  * @to_skip: Number of bytes to skip before copying
102  * @end: Offset of last byte to copy
103  * @direct: Transfer direction (true == from SG list to buffer, false == from
104  *          buffer to SG list)
105  */
106 void cc_copy_sg_portion(struct device *dev, u8 *dest, struct scatterlist *sg,
107 			u32 to_skip, u32 end, enum cc_sg_cpy_direct direct)
108 {
109 	u32 nents;
110 
111 	nents = sg_nents_for_len(sg, end);
112 	sg_copy_buffer(sg, nents, dest, (end - to_skip + 1), to_skip,
113 		       (direct == CC_SG_TO_BUF));
114 }
115 
116 static int cc_render_buff_to_mlli(struct device *dev, dma_addr_t buff_dma,
117 				  u32 buff_size, u32 *curr_nents,
118 				  u32 **mlli_entry_pp)
119 {
120 	u32 *mlli_entry_p = *mlli_entry_pp;
121 	u32 new_nents;
122 
123 	/* Verify there is no memory overflow*/
124 	new_nents = (*curr_nents + buff_size / CC_MAX_MLLI_ENTRY_SIZE + 1);
125 	if (new_nents > MAX_NUM_OF_TOTAL_MLLI_ENTRIES) {
126 		dev_err(dev, "Too many mlli entries. current %d max %d\n",
127 			new_nents, MAX_NUM_OF_TOTAL_MLLI_ENTRIES);
128 		return -ENOMEM;
129 	}
130 
131 	/*handle buffer longer than 64 kbytes */
132 	while (buff_size > CC_MAX_MLLI_ENTRY_SIZE) {
133 		cc_lli_set_addr(mlli_entry_p, buff_dma);
134 		cc_lli_set_size(mlli_entry_p, CC_MAX_MLLI_ENTRY_SIZE);
135 		dev_dbg(dev, "entry[%d]: single_buff=0x%08X size=%08X\n",
136 			*curr_nents, mlli_entry_p[LLI_WORD0_OFFSET],
137 			mlli_entry_p[LLI_WORD1_OFFSET]);
138 		buff_dma += CC_MAX_MLLI_ENTRY_SIZE;
139 		buff_size -= CC_MAX_MLLI_ENTRY_SIZE;
140 		mlli_entry_p = mlli_entry_p + 2;
141 		(*curr_nents)++;
142 	}
143 	/*Last entry */
144 	cc_lli_set_addr(mlli_entry_p, buff_dma);
145 	cc_lli_set_size(mlli_entry_p, buff_size);
146 	dev_dbg(dev, "entry[%d]: single_buff=0x%08X size=%08X\n",
147 		*curr_nents, mlli_entry_p[LLI_WORD0_OFFSET],
148 		mlli_entry_p[LLI_WORD1_OFFSET]);
149 	mlli_entry_p = mlli_entry_p + 2;
150 	*mlli_entry_pp = mlli_entry_p;
151 	(*curr_nents)++;
152 	return 0;
153 }
154 
155 static int cc_render_sg_to_mlli(struct device *dev, struct scatterlist *sgl,
156 				u32 sgl_data_len, u32 sgl_offset,
157 				u32 *curr_nents, u32 **mlli_entry_pp)
158 {
159 	struct scatterlist *curr_sgl = sgl;
160 	u32 *mlli_entry_p = *mlli_entry_pp;
161 	s32 rc = 0;
162 
163 	for ( ; (curr_sgl && sgl_data_len);
164 	      curr_sgl = sg_next(curr_sgl)) {
165 		u32 entry_data_len =
166 			(sgl_data_len > sg_dma_len(curr_sgl) - sgl_offset) ?
167 				sg_dma_len(curr_sgl) - sgl_offset :
168 				sgl_data_len;
169 		sgl_data_len -= entry_data_len;
170 		rc = cc_render_buff_to_mlli(dev, sg_dma_address(curr_sgl) +
171 					    sgl_offset, entry_data_len,
172 					    curr_nents, &mlli_entry_p);
173 		if (rc)
174 			return rc;
175 
176 		sgl_offset = 0;
177 	}
178 	*mlli_entry_pp = mlli_entry_p;
179 	return 0;
180 }
181 
182 static int cc_generate_mlli(struct device *dev, struct buffer_array *sg_data,
183 			    struct mlli_params *mlli_params, gfp_t flags)
184 {
185 	u32 *mlli_p;
186 	u32 total_nents = 0, prev_total_nents = 0;
187 	int rc = 0, i;
188 
189 	dev_dbg(dev, "NUM of SG's = %d\n", sg_data->num_of_buffers);
190 
191 	/* Allocate memory from the pointed pool */
192 	mlli_params->mlli_virt_addr =
193 		dma_pool_alloc(mlli_params->curr_pool, flags,
194 			       &mlli_params->mlli_dma_addr);
195 	if (!mlli_params->mlli_virt_addr) {
196 		dev_err(dev, "dma_pool_alloc() failed\n");
197 		rc = -ENOMEM;
198 		goto build_mlli_exit;
199 	}
200 	/* Point to start of MLLI */
201 	mlli_p = mlli_params->mlli_virt_addr;
202 	/* go over all SG's and link it to one MLLI table */
203 	for (i = 0; i < sg_data->num_of_buffers; i++) {
204 		union buffer_array_entry *entry = &sg_data->entry[i];
205 		u32 tot_len = sg_data->total_data_len[i];
206 		u32 offset = sg_data->offset[i];
207 
208 		rc = cc_render_sg_to_mlli(dev, entry->sgl, tot_len, offset,
209 					  &total_nents, &mlli_p);
210 		if (rc)
211 			return rc;
212 
213 		/* set last bit in the current table */
214 		if (sg_data->mlli_nents[i]) {
215 			/*Calculate the current MLLI table length for the
216 			 *length field in the descriptor
217 			 */
218 			*sg_data->mlli_nents[i] +=
219 				(total_nents - prev_total_nents);
220 			prev_total_nents = total_nents;
221 		}
222 	}
223 
224 	/* Set MLLI size for the bypass operation */
225 	mlli_params->mlli_len = (total_nents * LLI_ENTRY_BYTE_SIZE);
226 
227 	dev_dbg(dev, "MLLI params: virt_addr=%pK dma_addr=%pad mlli_len=0x%X\n",
228 		mlli_params->mlli_virt_addr, &mlli_params->mlli_dma_addr,
229 		mlli_params->mlli_len);
230 
231 build_mlli_exit:
232 	return rc;
233 }
234 
235 static void cc_add_sg_entry(struct device *dev, struct buffer_array *sgl_data,
236 			    unsigned int nents, struct scatterlist *sgl,
237 			    unsigned int data_len, unsigned int data_offset,
238 			    bool is_last_table, u32 *mlli_nents)
239 {
240 	unsigned int index = sgl_data->num_of_buffers;
241 
242 	dev_dbg(dev, "index=%u nents=%u sgl=%pK data_len=0x%08X is_last=%d\n",
243 		index, nents, sgl, data_len, is_last_table);
244 	sgl_data->nents[index] = nents;
245 	sgl_data->entry[index].sgl = sgl;
246 	sgl_data->offset[index] = data_offset;
247 	sgl_data->total_data_len[index] = data_len;
248 	sgl_data->is_last[index] = is_last_table;
249 	sgl_data->mlli_nents[index] = mlli_nents;
250 	if (sgl_data->mlli_nents[index])
251 		*sgl_data->mlli_nents[index] = 0;
252 	sgl_data->num_of_buffers++;
253 }
254 
255 static int cc_map_sg(struct device *dev, struct scatterlist *sg,
256 		     unsigned int nbytes, int direction, u32 *nents,
257 		     u32 max_sg_nents, u32 *lbytes, u32 *mapped_nents)
258 {
259 	int ret = 0;
260 
261 	if (!nbytes) {
262 		*mapped_nents = 0;
263 		*lbytes = 0;
264 		*nents = 0;
265 		return 0;
266 	}
267 
268 	*nents = cc_get_sgl_nents(dev, sg, nbytes, lbytes);
269 	if (*nents > max_sg_nents) {
270 		*nents = 0;
271 		dev_err(dev, "Too many fragments. current %d max %d\n",
272 			*nents, max_sg_nents);
273 		return -ENOMEM;
274 	}
275 
276 	ret = dma_map_sg(dev, sg, *nents, direction);
277 	if (!ret) {
278 		*nents = 0;
279 		dev_err(dev, "dma_map_sg() sg buffer failed %d\n", ret);
280 		return -ENOMEM;
281 	}
282 
283 	*mapped_nents = ret;
284 
285 	return 0;
286 }
287 
288 static int
289 cc_set_aead_conf_buf(struct device *dev, struct aead_req_ctx *areq_ctx,
290 		     u8 *config_data, struct buffer_array *sg_data,
291 		     unsigned int assoclen)
292 {
293 	dev_dbg(dev, " handle additional data config set to DLLI\n");
294 	/* create sg for the current buffer */
295 	sg_init_one(&areq_ctx->ccm_adata_sg, config_data,
296 		    AES_BLOCK_SIZE + areq_ctx->ccm_hdr_size);
297 	if (dma_map_sg(dev, &areq_ctx->ccm_adata_sg, 1, DMA_TO_DEVICE) != 1) {
298 		dev_err(dev, "dma_map_sg() config buffer failed\n");
299 		return -ENOMEM;
300 	}
301 	dev_dbg(dev, "Mapped curr_buff: dma_address=%pad page=%p addr=%pK offset=%u length=%u\n",
302 		&sg_dma_address(&areq_ctx->ccm_adata_sg),
303 		sg_page(&areq_ctx->ccm_adata_sg),
304 		sg_virt(&areq_ctx->ccm_adata_sg),
305 		areq_ctx->ccm_adata_sg.offset, areq_ctx->ccm_adata_sg.length);
306 	/* prepare for case of MLLI */
307 	if (assoclen > 0) {
308 		cc_add_sg_entry(dev, sg_data, 1, &areq_ctx->ccm_adata_sg,
309 				(AES_BLOCK_SIZE + areq_ctx->ccm_hdr_size),
310 				0, false, NULL);
311 	}
312 	return 0;
313 }
314 
315 static int cc_set_hash_buf(struct device *dev, struct ahash_req_ctx *areq_ctx,
316 			   u8 *curr_buff, u32 curr_buff_cnt,
317 			   struct buffer_array *sg_data)
318 {
319 	dev_dbg(dev, " handle curr buff %x set to   DLLI\n", curr_buff_cnt);
320 	/* create sg for the current buffer */
321 	sg_init_one(areq_ctx->buff_sg, curr_buff, curr_buff_cnt);
322 	if (dma_map_sg(dev, areq_ctx->buff_sg, 1, DMA_TO_DEVICE) != 1) {
323 		dev_err(dev, "dma_map_sg() src buffer failed\n");
324 		return -ENOMEM;
325 	}
326 	dev_dbg(dev, "Mapped curr_buff: dma_address=%pad page=%p addr=%pK offset=%u length=%u\n",
327 		&sg_dma_address(areq_ctx->buff_sg), sg_page(areq_ctx->buff_sg),
328 		sg_virt(areq_ctx->buff_sg), areq_ctx->buff_sg->offset,
329 		areq_ctx->buff_sg->length);
330 	areq_ctx->data_dma_buf_type = CC_DMA_BUF_DLLI;
331 	areq_ctx->curr_sg = areq_ctx->buff_sg;
332 	areq_ctx->in_nents = 0;
333 	/* prepare for case of MLLI */
334 	cc_add_sg_entry(dev, sg_data, 1, areq_ctx->buff_sg, curr_buff_cnt, 0,
335 			false, NULL);
336 	return 0;
337 }
338 
339 void cc_unmap_cipher_request(struct device *dev, void *ctx,
340 				unsigned int ivsize, struct scatterlist *src,
341 				struct scatterlist *dst)
342 {
343 	struct cipher_req_ctx *req_ctx = (struct cipher_req_ctx *)ctx;
344 
345 	if (req_ctx->gen_ctx.iv_dma_addr) {
346 		dev_dbg(dev, "Unmapped iv: iv_dma_addr=%pad iv_size=%u\n",
347 			&req_ctx->gen_ctx.iv_dma_addr, ivsize);
348 		dma_unmap_single(dev, req_ctx->gen_ctx.iv_dma_addr,
349 				 ivsize, DMA_BIDIRECTIONAL);
350 	}
351 	/* Release pool */
352 	if (req_ctx->dma_buf_type == CC_DMA_BUF_MLLI &&
353 	    req_ctx->mlli_params.mlli_virt_addr) {
354 		dma_pool_free(req_ctx->mlli_params.curr_pool,
355 			      req_ctx->mlli_params.mlli_virt_addr,
356 			      req_ctx->mlli_params.mlli_dma_addr);
357 	}
358 
359 	if (src != dst) {
360 		dma_unmap_sg(dev, src, req_ctx->in_nents, DMA_TO_DEVICE);
361 		dma_unmap_sg(dev, dst, req_ctx->out_nents, DMA_FROM_DEVICE);
362 		dev_dbg(dev, "Unmapped req->dst=%pK\n", sg_virt(dst));
363 		dev_dbg(dev, "Unmapped req->src=%pK\n", sg_virt(src));
364 	} else {
365 		dma_unmap_sg(dev, src, req_ctx->in_nents, DMA_BIDIRECTIONAL);
366 		dev_dbg(dev, "Unmapped req->src=%pK\n", sg_virt(src));
367 	}
368 }
369 
370 int cc_map_cipher_request(struct cc_drvdata *drvdata, void *ctx,
371 			  unsigned int ivsize, unsigned int nbytes,
372 			  void *info, struct scatterlist *src,
373 			  struct scatterlist *dst, gfp_t flags)
374 {
375 	struct cipher_req_ctx *req_ctx = (struct cipher_req_ctx *)ctx;
376 	struct mlli_params *mlli_params = &req_ctx->mlli_params;
377 	struct device *dev = drvdata_to_dev(drvdata);
378 	struct buffer_array sg_data;
379 	u32 dummy = 0;
380 	int rc = 0;
381 	u32 mapped_nents = 0;
382 	int src_direction = (src != dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL);
383 
384 	req_ctx->dma_buf_type = CC_DMA_BUF_DLLI;
385 	mlli_params->curr_pool = NULL;
386 	sg_data.num_of_buffers = 0;
387 
388 	/* Map IV buffer */
389 	if (ivsize) {
390 		dump_byte_array("iv", info, ivsize);
391 		req_ctx->gen_ctx.iv_dma_addr =
392 			dma_map_single(dev, info, ivsize, DMA_BIDIRECTIONAL);
393 		if (dma_mapping_error(dev, req_ctx->gen_ctx.iv_dma_addr)) {
394 			dev_err(dev, "Mapping iv %u B at va=%pK for DMA failed\n",
395 				ivsize, info);
396 			return -ENOMEM;
397 		}
398 		dev_dbg(dev, "Mapped iv %u B at va=%pK to dma=%pad\n",
399 			ivsize, info, &req_ctx->gen_ctx.iv_dma_addr);
400 	} else {
401 		req_ctx->gen_ctx.iv_dma_addr = 0;
402 	}
403 
404 	/* Map the src SGL */
405 	rc = cc_map_sg(dev, src, nbytes, src_direction, &req_ctx->in_nents,
406 		       LLI_MAX_NUM_OF_DATA_ENTRIES, &dummy, &mapped_nents);
407 	if (rc)
408 		goto cipher_exit;
409 	if (mapped_nents > 1)
410 		req_ctx->dma_buf_type = CC_DMA_BUF_MLLI;
411 
412 	if (src == dst) {
413 		/* Handle inplace operation */
414 		if (req_ctx->dma_buf_type == CC_DMA_BUF_MLLI) {
415 			req_ctx->out_nents = 0;
416 			cc_add_sg_entry(dev, &sg_data, req_ctx->in_nents, src,
417 					nbytes, 0, true,
418 					&req_ctx->in_mlli_nents);
419 		}
420 	} else {
421 		/* Map the dst sg */
422 		rc = cc_map_sg(dev, dst, nbytes, DMA_FROM_DEVICE,
423 			       &req_ctx->out_nents, LLI_MAX_NUM_OF_DATA_ENTRIES,
424 			       &dummy, &mapped_nents);
425 		if (rc)
426 			goto cipher_exit;
427 		if (mapped_nents > 1)
428 			req_ctx->dma_buf_type = CC_DMA_BUF_MLLI;
429 
430 		if (req_ctx->dma_buf_type == CC_DMA_BUF_MLLI) {
431 			cc_add_sg_entry(dev, &sg_data, req_ctx->in_nents, src,
432 					nbytes, 0, true,
433 					&req_ctx->in_mlli_nents);
434 			cc_add_sg_entry(dev, &sg_data, req_ctx->out_nents, dst,
435 					nbytes, 0, true,
436 					&req_ctx->out_mlli_nents);
437 		}
438 	}
439 
440 	if (req_ctx->dma_buf_type == CC_DMA_BUF_MLLI) {
441 		mlli_params->curr_pool = drvdata->mlli_buffs_pool;
442 		rc = cc_generate_mlli(dev, &sg_data, mlli_params, flags);
443 		if (rc)
444 			goto cipher_exit;
445 	}
446 
447 	dev_dbg(dev, "areq_ctx->dma_buf_type = %s\n",
448 		cc_dma_buf_type(req_ctx->dma_buf_type));
449 
450 	return 0;
451 
452 cipher_exit:
453 	cc_unmap_cipher_request(dev, req_ctx, ivsize, src, dst);
454 	return rc;
455 }
456 
457 void cc_unmap_aead_request(struct device *dev, struct aead_request *req)
458 {
459 	struct aead_req_ctx *areq_ctx = aead_request_ctx(req);
460 	unsigned int hw_iv_size = areq_ctx->hw_iv_size;
461 	struct cc_drvdata *drvdata = dev_get_drvdata(dev);
462 	int src_direction = (req->src != req->dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL);
463 
464 	if (areq_ctx->mac_buf_dma_addr) {
465 		dma_unmap_single(dev, areq_ctx->mac_buf_dma_addr,
466 				 MAX_MAC_SIZE, DMA_BIDIRECTIONAL);
467 	}
468 
469 	if (areq_ctx->cipher_mode == DRV_CIPHER_GCTR) {
470 		if (areq_ctx->hkey_dma_addr) {
471 			dma_unmap_single(dev, areq_ctx->hkey_dma_addr,
472 					 AES_BLOCK_SIZE, DMA_BIDIRECTIONAL);
473 		}
474 
475 		if (areq_ctx->gcm_block_len_dma_addr) {
476 			dma_unmap_single(dev, areq_ctx->gcm_block_len_dma_addr,
477 					 AES_BLOCK_SIZE, DMA_TO_DEVICE);
478 		}
479 
480 		if (areq_ctx->gcm_iv_inc1_dma_addr) {
481 			dma_unmap_single(dev, areq_ctx->gcm_iv_inc1_dma_addr,
482 					 AES_BLOCK_SIZE, DMA_TO_DEVICE);
483 		}
484 
485 		if (areq_ctx->gcm_iv_inc2_dma_addr) {
486 			dma_unmap_single(dev, areq_ctx->gcm_iv_inc2_dma_addr,
487 					 AES_BLOCK_SIZE, DMA_TO_DEVICE);
488 		}
489 	}
490 
491 	if (areq_ctx->ccm_hdr_size != ccm_header_size_null) {
492 		if (areq_ctx->ccm_iv0_dma_addr) {
493 			dma_unmap_single(dev, areq_ctx->ccm_iv0_dma_addr,
494 					 AES_BLOCK_SIZE, DMA_TO_DEVICE);
495 		}
496 
497 		dma_unmap_sg(dev, &areq_ctx->ccm_adata_sg, 1, DMA_TO_DEVICE);
498 	}
499 	if (areq_ctx->gen_ctx.iv_dma_addr) {
500 		dma_unmap_single(dev, areq_ctx->gen_ctx.iv_dma_addr,
501 				 hw_iv_size, DMA_BIDIRECTIONAL);
502 		kfree_sensitive(areq_ctx->gen_ctx.iv);
503 	}
504 
505 	/* Release pool */
506 	if ((areq_ctx->assoc_buff_type == CC_DMA_BUF_MLLI ||
507 	     areq_ctx->data_buff_type == CC_DMA_BUF_MLLI) &&
508 	    (areq_ctx->mlli_params.mlli_virt_addr)) {
509 		dev_dbg(dev, "free MLLI buffer: dma=%pad virt=%pK\n",
510 			&areq_ctx->mlli_params.mlli_dma_addr,
511 			areq_ctx->mlli_params.mlli_virt_addr);
512 		dma_pool_free(areq_ctx->mlli_params.curr_pool,
513 			      areq_ctx->mlli_params.mlli_virt_addr,
514 			      areq_ctx->mlli_params.mlli_dma_addr);
515 	}
516 
517 	dev_dbg(dev, "Unmapping src sgl: req->src=%pK areq_ctx->src.nents=%u areq_ctx->assoc.nents=%u assoclen:%u cryptlen=%u\n",
518 		sg_virt(req->src), areq_ctx->src.nents, areq_ctx->assoc.nents,
519 		areq_ctx->assoclen, req->cryptlen);
520 
521 	dma_unmap_sg(dev, req->src, areq_ctx->src.mapped_nents, src_direction);
522 	if (req->src != req->dst) {
523 		dev_dbg(dev, "Unmapping dst sgl: req->dst=%pK\n",
524 			sg_virt(req->dst));
525 		dma_unmap_sg(dev, req->dst, areq_ctx->dst.mapped_nents, DMA_FROM_DEVICE);
526 	}
527 	if (drvdata->coherent &&
528 	    areq_ctx->gen_ctx.op_type == DRV_CRYPTO_DIRECTION_DECRYPT &&
529 	    req->src == req->dst) {
530 		/* copy back mac from temporary location to deal with possible
531 		 * data memory overriding that caused by cache coherence
532 		 * problem.
533 		 */
534 		cc_copy_mac(dev, req, CC_SG_FROM_BUF);
535 	}
536 }
537 
538 static bool cc_is_icv_frag(unsigned int sgl_nents, unsigned int authsize,
539 			   u32 last_entry_data_size)
540 {
541 	return ((sgl_nents > 1) && (last_entry_data_size < authsize));
542 }
543 
544 static int cc_aead_chain_iv(struct cc_drvdata *drvdata,
545 			    struct aead_request *req,
546 			    struct buffer_array *sg_data,
547 			    bool is_last, bool do_chain)
548 {
549 	struct aead_req_ctx *areq_ctx = aead_request_ctx(req);
550 	unsigned int hw_iv_size = areq_ctx->hw_iv_size;
551 	struct device *dev = drvdata_to_dev(drvdata);
552 	gfp_t flags = cc_gfp_flags(&req->base);
553 	int rc = 0;
554 
555 	if (!req->iv) {
556 		areq_ctx->gen_ctx.iv_dma_addr = 0;
557 		areq_ctx->gen_ctx.iv = NULL;
558 		goto chain_iv_exit;
559 	}
560 
561 	areq_ctx->gen_ctx.iv = kmemdup(req->iv, hw_iv_size, flags);
562 	if (!areq_ctx->gen_ctx.iv)
563 		return -ENOMEM;
564 
565 	areq_ctx->gen_ctx.iv_dma_addr =
566 		dma_map_single(dev, areq_ctx->gen_ctx.iv, hw_iv_size,
567 			       DMA_BIDIRECTIONAL);
568 	if (dma_mapping_error(dev, areq_ctx->gen_ctx.iv_dma_addr)) {
569 		dev_err(dev, "Mapping iv %u B at va=%pK for DMA failed\n",
570 			hw_iv_size, req->iv);
571 		kfree_sensitive(areq_ctx->gen_ctx.iv);
572 		areq_ctx->gen_ctx.iv = NULL;
573 		rc = -ENOMEM;
574 		goto chain_iv_exit;
575 	}
576 
577 	dev_dbg(dev, "Mapped iv %u B at va=%pK to dma=%pad\n",
578 		hw_iv_size, req->iv, &areq_ctx->gen_ctx.iv_dma_addr);
579 
580 chain_iv_exit:
581 	return rc;
582 }
583 
584 static int cc_aead_chain_assoc(struct cc_drvdata *drvdata,
585 			       struct aead_request *req,
586 			       struct buffer_array *sg_data,
587 			       bool is_last, bool do_chain)
588 {
589 	struct aead_req_ctx *areq_ctx = aead_request_ctx(req);
590 	int rc = 0;
591 	int mapped_nents = 0;
592 	struct device *dev = drvdata_to_dev(drvdata);
593 
594 	if (!sg_data) {
595 		rc = -EINVAL;
596 		goto chain_assoc_exit;
597 	}
598 
599 	if (areq_ctx->assoclen == 0) {
600 		areq_ctx->assoc_buff_type = CC_DMA_BUF_NULL;
601 		areq_ctx->assoc.nents = 0;
602 		areq_ctx->assoc.mlli_nents = 0;
603 		dev_dbg(dev, "Chain assoc of length 0: buff_type=%s nents=%u\n",
604 			cc_dma_buf_type(areq_ctx->assoc_buff_type),
605 			areq_ctx->assoc.nents);
606 		goto chain_assoc_exit;
607 	}
608 
609 	mapped_nents = sg_nents_for_len(req->src, areq_ctx->assoclen);
610 	if (mapped_nents < 0)
611 		return mapped_nents;
612 
613 	if (mapped_nents > LLI_MAX_NUM_OF_ASSOC_DATA_ENTRIES) {
614 		dev_err(dev, "Too many fragments. current %d max %d\n",
615 			mapped_nents, LLI_MAX_NUM_OF_ASSOC_DATA_ENTRIES);
616 		return -ENOMEM;
617 	}
618 	areq_ctx->assoc.nents = mapped_nents;
619 
620 	/* in CCM case we have additional entry for
621 	 * ccm header configurations
622 	 */
623 	if (areq_ctx->ccm_hdr_size != ccm_header_size_null) {
624 		if ((mapped_nents + 1) > LLI_MAX_NUM_OF_ASSOC_DATA_ENTRIES) {
625 			dev_err(dev, "CCM case.Too many fragments. Current %d max %d\n",
626 				(areq_ctx->assoc.nents + 1),
627 				LLI_MAX_NUM_OF_ASSOC_DATA_ENTRIES);
628 			rc = -ENOMEM;
629 			goto chain_assoc_exit;
630 		}
631 	}
632 
633 	if (mapped_nents == 1 && areq_ctx->ccm_hdr_size == ccm_header_size_null)
634 		areq_ctx->assoc_buff_type = CC_DMA_BUF_DLLI;
635 	else
636 		areq_ctx->assoc_buff_type = CC_DMA_BUF_MLLI;
637 
638 	if (do_chain || areq_ctx->assoc_buff_type == CC_DMA_BUF_MLLI) {
639 		dev_dbg(dev, "Chain assoc: buff_type=%s nents=%u\n",
640 			cc_dma_buf_type(areq_ctx->assoc_buff_type),
641 			areq_ctx->assoc.nents);
642 		cc_add_sg_entry(dev, sg_data, areq_ctx->assoc.nents, req->src,
643 				areq_ctx->assoclen, 0, is_last,
644 				&areq_ctx->assoc.mlli_nents);
645 		areq_ctx->assoc_buff_type = CC_DMA_BUF_MLLI;
646 	}
647 
648 chain_assoc_exit:
649 	return rc;
650 }
651 
652 static void cc_prepare_aead_data_dlli(struct aead_request *req,
653 				      u32 *src_last_bytes, u32 *dst_last_bytes)
654 {
655 	struct aead_req_ctx *areq_ctx = aead_request_ctx(req);
656 	enum drv_crypto_direction direct = areq_ctx->gen_ctx.op_type;
657 	unsigned int authsize = areq_ctx->req_authsize;
658 	struct scatterlist *sg;
659 	ssize_t offset;
660 
661 	areq_ctx->is_icv_fragmented = false;
662 
663 	if ((req->src == req->dst) || direct == DRV_CRYPTO_DIRECTION_DECRYPT) {
664 		sg = areq_ctx->src_sgl;
665 		offset = *src_last_bytes - authsize;
666 	} else {
667 		sg = areq_ctx->dst_sgl;
668 		offset = *dst_last_bytes - authsize;
669 	}
670 
671 	areq_ctx->icv_dma_addr = sg_dma_address(sg) + offset;
672 	areq_ctx->icv_virt_addr = sg_virt(sg) + offset;
673 }
674 
675 static void cc_prepare_aead_data_mlli(struct cc_drvdata *drvdata,
676 				      struct aead_request *req,
677 				      struct buffer_array *sg_data,
678 				      u32 *src_last_bytes, u32 *dst_last_bytes,
679 				      bool is_last_table)
680 {
681 	struct aead_req_ctx *areq_ctx = aead_request_ctx(req);
682 	enum drv_crypto_direction direct = areq_ctx->gen_ctx.op_type;
683 	unsigned int authsize = areq_ctx->req_authsize;
684 	struct device *dev = drvdata_to_dev(drvdata);
685 	struct scatterlist *sg;
686 
687 	if (req->src == req->dst) {
688 		/*INPLACE*/
689 		cc_add_sg_entry(dev, sg_data, areq_ctx->src.nents,
690 				areq_ctx->src_sgl, areq_ctx->cryptlen,
691 				areq_ctx->src_offset, is_last_table,
692 				&areq_ctx->src.mlli_nents);
693 
694 		areq_ctx->is_icv_fragmented =
695 			cc_is_icv_frag(areq_ctx->src.nents, authsize,
696 				       *src_last_bytes);
697 
698 		if (areq_ctx->is_icv_fragmented) {
699 			/* Backup happens only when ICV is fragmented, ICV
700 			 * verification is made by CPU compare in order to
701 			 * simplify MAC verification upon request completion
702 			 */
703 			if (direct == DRV_CRYPTO_DIRECTION_DECRYPT) {
704 				/* In coherent platforms (e.g. ACP)
705 				 * already copying ICV for any
706 				 * INPLACE-DECRYPT operation, hence
707 				 * we must neglect this code.
708 				 */
709 				if (!drvdata->coherent)
710 					cc_copy_mac(dev, req, CC_SG_TO_BUF);
711 
712 				areq_ctx->icv_virt_addr = areq_ctx->backup_mac;
713 			} else {
714 				areq_ctx->icv_virt_addr = areq_ctx->mac_buf;
715 				areq_ctx->icv_dma_addr =
716 					areq_ctx->mac_buf_dma_addr;
717 			}
718 		} else { /* Contig. ICV */
719 			sg = &areq_ctx->src_sgl[areq_ctx->src.nents - 1];
720 			/*Should hanlde if the sg is not contig.*/
721 			areq_ctx->icv_dma_addr = sg_dma_address(sg) +
722 				(*src_last_bytes - authsize);
723 			areq_ctx->icv_virt_addr = sg_virt(sg) +
724 				(*src_last_bytes - authsize);
725 		}
726 
727 	} else if (direct == DRV_CRYPTO_DIRECTION_DECRYPT) {
728 		/*NON-INPLACE and DECRYPT*/
729 		cc_add_sg_entry(dev, sg_data, areq_ctx->src.nents,
730 				areq_ctx->src_sgl, areq_ctx->cryptlen,
731 				areq_ctx->src_offset, is_last_table,
732 				&areq_ctx->src.mlli_nents);
733 		cc_add_sg_entry(dev, sg_data, areq_ctx->dst.nents,
734 				areq_ctx->dst_sgl, areq_ctx->cryptlen,
735 				areq_ctx->dst_offset, is_last_table,
736 				&areq_ctx->dst.mlli_nents);
737 
738 		areq_ctx->is_icv_fragmented =
739 			cc_is_icv_frag(areq_ctx->src.nents, authsize,
740 				       *src_last_bytes);
741 		/* Backup happens only when ICV is fragmented, ICV
742 
743 		 * verification is made by CPU compare in order to simplify
744 		 * MAC verification upon request completion
745 		 */
746 		if (areq_ctx->is_icv_fragmented) {
747 			cc_copy_mac(dev, req, CC_SG_TO_BUF);
748 			areq_ctx->icv_virt_addr = areq_ctx->backup_mac;
749 
750 		} else { /* Contig. ICV */
751 			sg = &areq_ctx->src_sgl[areq_ctx->src.nents - 1];
752 			/*Should hanlde if the sg is not contig.*/
753 			areq_ctx->icv_dma_addr = sg_dma_address(sg) +
754 				(*src_last_bytes - authsize);
755 			areq_ctx->icv_virt_addr = sg_virt(sg) +
756 				(*src_last_bytes - authsize);
757 		}
758 
759 	} else {
760 		/*NON-INPLACE and ENCRYPT*/
761 		cc_add_sg_entry(dev, sg_data, areq_ctx->dst.nents,
762 				areq_ctx->dst_sgl, areq_ctx->cryptlen,
763 				areq_ctx->dst_offset, is_last_table,
764 				&areq_ctx->dst.mlli_nents);
765 		cc_add_sg_entry(dev, sg_data, areq_ctx->src.nents,
766 				areq_ctx->src_sgl, areq_ctx->cryptlen,
767 				areq_ctx->src_offset, is_last_table,
768 				&areq_ctx->src.mlli_nents);
769 
770 		areq_ctx->is_icv_fragmented =
771 			cc_is_icv_frag(areq_ctx->dst.nents, authsize,
772 				       *dst_last_bytes);
773 
774 		if (!areq_ctx->is_icv_fragmented) {
775 			sg = &areq_ctx->dst_sgl[areq_ctx->dst.nents - 1];
776 			/* Contig. ICV */
777 			areq_ctx->icv_dma_addr = sg_dma_address(sg) +
778 				(*dst_last_bytes - authsize);
779 			areq_ctx->icv_virt_addr = sg_virt(sg) +
780 				(*dst_last_bytes - authsize);
781 		} else {
782 			areq_ctx->icv_dma_addr = areq_ctx->mac_buf_dma_addr;
783 			areq_ctx->icv_virt_addr = areq_ctx->mac_buf;
784 		}
785 	}
786 }
787 
788 static int cc_aead_chain_data(struct cc_drvdata *drvdata,
789 			      struct aead_request *req,
790 			      struct buffer_array *sg_data,
791 			      bool is_last_table, bool do_chain)
792 {
793 	struct aead_req_ctx *areq_ctx = aead_request_ctx(req);
794 	struct device *dev = drvdata_to_dev(drvdata);
795 	enum drv_crypto_direction direct = areq_ctx->gen_ctx.op_type;
796 	unsigned int authsize = areq_ctx->req_authsize;
797 	unsigned int src_last_bytes = 0, dst_last_bytes = 0;
798 	int rc = 0;
799 	u32 src_mapped_nents = 0, dst_mapped_nents = 0;
800 	u32 offset = 0;
801 	/* non-inplace mode */
802 	unsigned int size_for_map = req->assoclen + req->cryptlen;
803 	u32 sg_index = 0;
804 	u32 size_to_skip = req->assoclen;
805 	struct scatterlist *sgl;
806 
807 	offset = size_to_skip;
808 
809 	if (!sg_data)
810 		return -EINVAL;
811 
812 	areq_ctx->src_sgl = req->src;
813 	areq_ctx->dst_sgl = req->dst;
814 
815 	size_for_map += (direct == DRV_CRYPTO_DIRECTION_ENCRYPT) ?
816 			authsize : 0;
817 	src_mapped_nents = cc_get_sgl_nents(dev, req->src, size_for_map,
818 					    &src_last_bytes);
819 	sg_index = areq_ctx->src_sgl->length;
820 	//check where the data starts
821 	while (src_mapped_nents && (sg_index <= size_to_skip)) {
822 		src_mapped_nents--;
823 		offset -= areq_ctx->src_sgl->length;
824 		sgl = sg_next(areq_ctx->src_sgl);
825 		if (!sgl)
826 			break;
827 		areq_ctx->src_sgl = sgl;
828 		sg_index += areq_ctx->src_sgl->length;
829 	}
830 	if (src_mapped_nents > LLI_MAX_NUM_OF_DATA_ENTRIES) {
831 		dev_err(dev, "Too many fragments. current %d max %d\n",
832 			src_mapped_nents, LLI_MAX_NUM_OF_DATA_ENTRIES);
833 		return -ENOMEM;
834 	}
835 
836 	areq_ctx->src.nents = src_mapped_nents;
837 
838 	areq_ctx->src_offset = offset;
839 
840 	if (req->src != req->dst) {
841 		size_for_map = req->assoclen + req->cryptlen;
842 
843 		if (direct == DRV_CRYPTO_DIRECTION_ENCRYPT)
844 			size_for_map += authsize;
845 		else
846 			size_for_map -= authsize;
847 
848 		rc = cc_map_sg(dev, req->dst, size_for_map, DMA_FROM_DEVICE,
849 			       &areq_ctx->dst.mapped_nents,
850 			       LLI_MAX_NUM_OF_DATA_ENTRIES, &dst_last_bytes,
851 			       &dst_mapped_nents);
852 		if (rc)
853 			goto chain_data_exit;
854 	}
855 
856 	dst_mapped_nents = cc_get_sgl_nents(dev, req->dst, size_for_map,
857 					    &dst_last_bytes);
858 	sg_index = areq_ctx->dst_sgl->length;
859 	offset = size_to_skip;
860 
861 	//check where the data starts
862 	while (dst_mapped_nents && sg_index <= size_to_skip) {
863 		dst_mapped_nents--;
864 		offset -= areq_ctx->dst_sgl->length;
865 		sgl = sg_next(areq_ctx->dst_sgl);
866 		if (!sgl)
867 			break;
868 		areq_ctx->dst_sgl = sgl;
869 		sg_index += areq_ctx->dst_sgl->length;
870 	}
871 	if (dst_mapped_nents > LLI_MAX_NUM_OF_DATA_ENTRIES) {
872 		dev_err(dev, "Too many fragments. current %d max %d\n",
873 			dst_mapped_nents, LLI_MAX_NUM_OF_DATA_ENTRIES);
874 		return -ENOMEM;
875 	}
876 	areq_ctx->dst.nents = dst_mapped_nents;
877 	areq_ctx->dst_offset = offset;
878 	if (src_mapped_nents > 1 ||
879 	    dst_mapped_nents  > 1 ||
880 	    do_chain) {
881 		areq_ctx->data_buff_type = CC_DMA_BUF_MLLI;
882 		cc_prepare_aead_data_mlli(drvdata, req, sg_data,
883 					  &src_last_bytes, &dst_last_bytes,
884 					  is_last_table);
885 	} else {
886 		areq_ctx->data_buff_type = CC_DMA_BUF_DLLI;
887 		cc_prepare_aead_data_dlli(req, &src_last_bytes,
888 					  &dst_last_bytes);
889 	}
890 
891 chain_data_exit:
892 	return rc;
893 }
894 
895 static void cc_update_aead_mlli_nents(struct cc_drvdata *drvdata,
896 				      struct aead_request *req)
897 {
898 	struct aead_req_ctx *areq_ctx = aead_request_ctx(req);
899 	u32 curr_mlli_size = 0;
900 
901 	if (areq_ctx->assoc_buff_type == CC_DMA_BUF_MLLI) {
902 		areq_ctx->assoc.sram_addr = drvdata->mlli_sram_addr;
903 		curr_mlli_size = areq_ctx->assoc.mlli_nents *
904 						LLI_ENTRY_BYTE_SIZE;
905 	}
906 
907 	if (areq_ctx->data_buff_type == CC_DMA_BUF_MLLI) {
908 		/*Inplace case dst nents equal to src nents*/
909 		if (req->src == req->dst) {
910 			areq_ctx->dst.mlli_nents = areq_ctx->src.mlli_nents;
911 			areq_ctx->src.sram_addr = drvdata->mlli_sram_addr +
912 								curr_mlli_size;
913 			areq_ctx->dst.sram_addr = areq_ctx->src.sram_addr;
914 			if (!areq_ctx->is_single_pass)
915 				areq_ctx->assoc.mlli_nents +=
916 					areq_ctx->src.mlli_nents;
917 		} else {
918 			if (areq_ctx->gen_ctx.op_type ==
919 					DRV_CRYPTO_DIRECTION_DECRYPT) {
920 				areq_ctx->src.sram_addr =
921 						drvdata->mlli_sram_addr +
922 								curr_mlli_size;
923 				areq_ctx->dst.sram_addr =
924 						areq_ctx->src.sram_addr +
925 						areq_ctx->src.mlli_nents *
926 						LLI_ENTRY_BYTE_SIZE;
927 				if (!areq_ctx->is_single_pass)
928 					areq_ctx->assoc.mlli_nents +=
929 						areq_ctx->src.mlli_nents;
930 			} else {
931 				areq_ctx->dst.sram_addr =
932 						drvdata->mlli_sram_addr +
933 								curr_mlli_size;
934 				areq_ctx->src.sram_addr =
935 						areq_ctx->dst.sram_addr +
936 						areq_ctx->dst.mlli_nents *
937 						LLI_ENTRY_BYTE_SIZE;
938 				if (!areq_ctx->is_single_pass)
939 					areq_ctx->assoc.mlli_nents +=
940 						areq_ctx->dst.mlli_nents;
941 			}
942 		}
943 	}
944 }
945 
946 int cc_map_aead_request(struct cc_drvdata *drvdata, struct aead_request *req)
947 {
948 	struct aead_req_ctx *areq_ctx = aead_request_ctx(req);
949 	struct mlli_params *mlli_params = &areq_ctx->mlli_params;
950 	struct device *dev = drvdata_to_dev(drvdata);
951 	struct buffer_array sg_data;
952 	unsigned int authsize = areq_ctx->req_authsize;
953 	int rc = 0;
954 	dma_addr_t dma_addr;
955 	u32 mapped_nents = 0;
956 	u32 dummy = 0; /*used for the assoc data fragments */
957 	u32 size_to_map;
958 	gfp_t flags = cc_gfp_flags(&req->base);
959 
960 	mlli_params->curr_pool = NULL;
961 	sg_data.num_of_buffers = 0;
962 
963 	/* copy mac to a temporary location to deal with possible
964 	 * data memory overriding that caused by cache coherence problem.
965 	 */
966 	if (drvdata->coherent &&
967 	    areq_ctx->gen_ctx.op_type == DRV_CRYPTO_DIRECTION_DECRYPT &&
968 	    req->src == req->dst)
969 		cc_copy_mac(dev, req, CC_SG_TO_BUF);
970 
971 	/* cacluate the size for cipher remove ICV in decrypt*/
972 	areq_ctx->cryptlen = (areq_ctx->gen_ctx.op_type ==
973 				 DRV_CRYPTO_DIRECTION_ENCRYPT) ?
974 				req->cryptlen :
975 				(req->cryptlen - authsize);
976 
977 	dma_addr = dma_map_single(dev, areq_ctx->mac_buf, MAX_MAC_SIZE,
978 				  DMA_BIDIRECTIONAL);
979 	if (dma_mapping_error(dev, dma_addr)) {
980 		dev_err(dev, "Mapping mac_buf %u B at va=%pK for DMA failed\n",
981 			MAX_MAC_SIZE, areq_ctx->mac_buf);
982 		rc = -ENOMEM;
983 		goto aead_map_failure;
984 	}
985 	areq_ctx->mac_buf_dma_addr = dma_addr;
986 
987 	if (areq_ctx->ccm_hdr_size != ccm_header_size_null) {
988 		void *addr = areq_ctx->ccm_config + CCM_CTR_COUNT_0_OFFSET;
989 
990 		dma_addr = dma_map_single(dev, addr, AES_BLOCK_SIZE,
991 					  DMA_TO_DEVICE);
992 
993 		if (dma_mapping_error(dev, dma_addr)) {
994 			dev_err(dev, "Mapping mac_buf %u B at va=%pK for DMA failed\n",
995 				AES_BLOCK_SIZE, addr);
996 			areq_ctx->ccm_iv0_dma_addr = 0;
997 			rc = -ENOMEM;
998 			goto aead_map_failure;
999 		}
1000 		areq_ctx->ccm_iv0_dma_addr = dma_addr;
1001 
1002 		rc = cc_set_aead_conf_buf(dev, areq_ctx, areq_ctx->ccm_config,
1003 					  &sg_data, areq_ctx->assoclen);
1004 		if (rc)
1005 			goto aead_map_failure;
1006 	}
1007 
1008 	if (areq_ctx->cipher_mode == DRV_CIPHER_GCTR) {
1009 		dma_addr = dma_map_single(dev, areq_ctx->hkey, AES_BLOCK_SIZE,
1010 					  DMA_BIDIRECTIONAL);
1011 		if (dma_mapping_error(dev, dma_addr)) {
1012 			dev_err(dev, "Mapping hkey %u B at va=%pK for DMA failed\n",
1013 				AES_BLOCK_SIZE, areq_ctx->hkey);
1014 			rc = -ENOMEM;
1015 			goto aead_map_failure;
1016 		}
1017 		areq_ctx->hkey_dma_addr = dma_addr;
1018 
1019 		dma_addr = dma_map_single(dev, &areq_ctx->gcm_len_block,
1020 					  AES_BLOCK_SIZE, DMA_TO_DEVICE);
1021 		if (dma_mapping_error(dev, dma_addr)) {
1022 			dev_err(dev, "Mapping gcm_len_block %u B at va=%pK for DMA failed\n",
1023 				AES_BLOCK_SIZE, &areq_ctx->gcm_len_block);
1024 			rc = -ENOMEM;
1025 			goto aead_map_failure;
1026 		}
1027 		areq_ctx->gcm_block_len_dma_addr = dma_addr;
1028 
1029 		dma_addr = dma_map_single(dev, areq_ctx->gcm_iv_inc1,
1030 					  AES_BLOCK_SIZE, DMA_TO_DEVICE);
1031 
1032 		if (dma_mapping_error(dev, dma_addr)) {
1033 			dev_err(dev, "Mapping gcm_iv_inc1 %u B at va=%pK for DMA failed\n",
1034 				AES_BLOCK_SIZE, (areq_ctx->gcm_iv_inc1));
1035 			areq_ctx->gcm_iv_inc1_dma_addr = 0;
1036 			rc = -ENOMEM;
1037 			goto aead_map_failure;
1038 		}
1039 		areq_ctx->gcm_iv_inc1_dma_addr = dma_addr;
1040 
1041 		dma_addr = dma_map_single(dev, areq_ctx->gcm_iv_inc2,
1042 					  AES_BLOCK_SIZE, DMA_TO_DEVICE);
1043 
1044 		if (dma_mapping_error(dev, dma_addr)) {
1045 			dev_err(dev, "Mapping gcm_iv_inc2 %u B at va=%pK for DMA failed\n",
1046 				AES_BLOCK_SIZE, (areq_ctx->gcm_iv_inc2));
1047 			areq_ctx->gcm_iv_inc2_dma_addr = 0;
1048 			rc = -ENOMEM;
1049 			goto aead_map_failure;
1050 		}
1051 		areq_ctx->gcm_iv_inc2_dma_addr = dma_addr;
1052 	}
1053 
1054 	size_to_map = req->cryptlen + req->assoclen;
1055 	/* If we do in-place encryption, we also need the auth tag */
1056 	if ((areq_ctx->gen_ctx.op_type == DRV_CRYPTO_DIRECTION_ENCRYPT) &&
1057 	   (req->src == req->dst)) {
1058 		size_to_map += authsize;
1059 	}
1060 
1061 	rc = cc_map_sg(dev, req->src, size_to_map,
1062 		       (req->src != req->dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL),
1063 		       &areq_ctx->src.mapped_nents,
1064 		       (LLI_MAX_NUM_OF_ASSOC_DATA_ENTRIES +
1065 			LLI_MAX_NUM_OF_DATA_ENTRIES),
1066 		       &dummy, &mapped_nents);
1067 	if (rc)
1068 		goto aead_map_failure;
1069 
1070 	if (areq_ctx->is_single_pass) {
1071 		/*
1072 		 * Create MLLI table for:
1073 		 *   (1) Assoc. data
1074 		 *   (2) Src/Dst SGLs
1075 		 *   Note: IV is contg. buffer (not an SGL)
1076 		 */
1077 		rc = cc_aead_chain_assoc(drvdata, req, &sg_data, true, false);
1078 		if (rc)
1079 			goto aead_map_failure;
1080 		rc = cc_aead_chain_iv(drvdata, req, &sg_data, true, false);
1081 		if (rc)
1082 			goto aead_map_failure;
1083 		rc = cc_aead_chain_data(drvdata, req, &sg_data, true, false);
1084 		if (rc)
1085 			goto aead_map_failure;
1086 	} else { /* DOUBLE-PASS flow */
1087 		/*
1088 		 * Prepare MLLI table(s) in this order:
1089 		 *
1090 		 * If ENCRYPT/DECRYPT (inplace):
1091 		 *   (1) MLLI table for assoc
1092 		 *   (2) IV entry (chained right after end of assoc)
1093 		 *   (3) MLLI for src/dst (inplace operation)
1094 		 *
1095 		 * If ENCRYPT (non-inplace)
1096 		 *   (1) MLLI table for assoc
1097 		 *   (2) IV entry (chained right after end of assoc)
1098 		 *   (3) MLLI for dst
1099 		 *   (4) MLLI for src
1100 		 *
1101 		 * If DECRYPT (non-inplace)
1102 		 *   (1) MLLI table for assoc
1103 		 *   (2) IV entry (chained right after end of assoc)
1104 		 *   (3) MLLI for src
1105 		 *   (4) MLLI for dst
1106 		 */
1107 		rc = cc_aead_chain_assoc(drvdata, req, &sg_data, false, true);
1108 		if (rc)
1109 			goto aead_map_failure;
1110 		rc = cc_aead_chain_iv(drvdata, req, &sg_data, false, true);
1111 		if (rc)
1112 			goto aead_map_failure;
1113 		rc = cc_aead_chain_data(drvdata, req, &sg_data, true, true);
1114 		if (rc)
1115 			goto aead_map_failure;
1116 	}
1117 
1118 	/* Mlli support -start building the MLLI according to the above
1119 	 * results
1120 	 */
1121 	if (areq_ctx->assoc_buff_type == CC_DMA_BUF_MLLI ||
1122 	    areq_ctx->data_buff_type == CC_DMA_BUF_MLLI) {
1123 		mlli_params->curr_pool = drvdata->mlli_buffs_pool;
1124 		rc = cc_generate_mlli(dev, &sg_data, mlli_params, flags);
1125 		if (rc)
1126 			goto aead_map_failure;
1127 
1128 		cc_update_aead_mlli_nents(drvdata, req);
1129 		dev_dbg(dev, "assoc params mn %d\n",
1130 			areq_ctx->assoc.mlli_nents);
1131 		dev_dbg(dev, "src params mn %d\n", areq_ctx->src.mlli_nents);
1132 		dev_dbg(dev, "dst params mn %d\n", areq_ctx->dst.mlli_nents);
1133 	}
1134 	return 0;
1135 
1136 aead_map_failure:
1137 	cc_unmap_aead_request(dev, req);
1138 	return rc;
1139 }
1140 
1141 int cc_map_hash_request_final(struct cc_drvdata *drvdata, void *ctx,
1142 			      struct scatterlist *src, unsigned int nbytes,
1143 			      bool do_update, gfp_t flags)
1144 {
1145 	struct ahash_req_ctx *areq_ctx = (struct ahash_req_ctx *)ctx;
1146 	struct device *dev = drvdata_to_dev(drvdata);
1147 	u8 *curr_buff = cc_hash_buf(areq_ctx);
1148 	u32 *curr_buff_cnt = cc_hash_buf_cnt(areq_ctx);
1149 	struct mlli_params *mlli_params = &areq_ctx->mlli_params;
1150 	struct buffer_array sg_data;
1151 	int rc = 0;
1152 	u32 dummy = 0;
1153 	u32 mapped_nents = 0;
1154 
1155 	dev_dbg(dev, "final params : curr_buff=%pK curr_buff_cnt=0x%X nbytes = 0x%X src=%pK curr_index=%u\n",
1156 		curr_buff, *curr_buff_cnt, nbytes, src, areq_ctx->buff_index);
1157 	/* Init the type of the dma buffer */
1158 	areq_ctx->data_dma_buf_type = CC_DMA_BUF_NULL;
1159 	mlli_params->curr_pool = NULL;
1160 	sg_data.num_of_buffers = 0;
1161 	areq_ctx->in_nents = 0;
1162 
1163 	if (nbytes == 0 && *curr_buff_cnt == 0) {
1164 		/* nothing to do */
1165 		return 0;
1166 	}
1167 
1168 	/* map the previous buffer */
1169 	if (*curr_buff_cnt) {
1170 		rc = cc_set_hash_buf(dev, areq_ctx, curr_buff, *curr_buff_cnt,
1171 				     &sg_data);
1172 		if (rc)
1173 			return rc;
1174 	}
1175 
1176 	if (src && nbytes > 0 && do_update) {
1177 		rc = cc_map_sg(dev, src, nbytes, DMA_TO_DEVICE,
1178 			       &areq_ctx->in_nents, LLI_MAX_NUM_OF_DATA_ENTRIES,
1179 			       &dummy, &mapped_nents);
1180 		if (rc)
1181 			goto unmap_curr_buff;
1182 		if (src && mapped_nents == 1 &&
1183 		    areq_ctx->data_dma_buf_type == CC_DMA_BUF_NULL) {
1184 			memcpy(areq_ctx->buff_sg, src,
1185 			       sizeof(struct scatterlist));
1186 			areq_ctx->buff_sg->length = nbytes;
1187 			areq_ctx->curr_sg = areq_ctx->buff_sg;
1188 			areq_ctx->data_dma_buf_type = CC_DMA_BUF_DLLI;
1189 		} else {
1190 			areq_ctx->data_dma_buf_type = CC_DMA_BUF_MLLI;
1191 		}
1192 	}
1193 
1194 	/*build mlli */
1195 	if (areq_ctx->data_dma_buf_type == CC_DMA_BUF_MLLI) {
1196 		mlli_params->curr_pool = drvdata->mlli_buffs_pool;
1197 		/* add the src data to the sg_data */
1198 		cc_add_sg_entry(dev, &sg_data, areq_ctx->in_nents, src, nbytes,
1199 				0, true, &areq_ctx->mlli_nents);
1200 		rc = cc_generate_mlli(dev, &sg_data, mlli_params, flags);
1201 		if (rc)
1202 			goto fail_unmap_din;
1203 	}
1204 	/* change the buffer index for the unmap function */
1205 	areq_ctx->buff_index = (areq_ctx->buff_index ^ 1);
1206 	dev_dbg(dev, "areq_ctx->data_dma_buf_type = %s\n",
1207 		cc_dma_buf_type(areq_ctx->data_dma_buf_type));
1208 	return 0;
1209 
1210 fail_unmap_din:
1211 	dma_unmap_sg(dev, src, areq_ctx->in_nents, DMA_TO_DEVICE);
1212 
1213 unmap_curr_buff:
1214 	if (*curr_buff_cnt)
1215 		dma_unmap_sg(dev, areq_ctx->buff_sg, 1, DMA_TO_DEVICE);
1216 
1217 	return rc;
1218 }
1219 
1220 int cc_map_hash_request_update(struct cc_drvdata *drvdata, void *ctx,
1221 			       struct scatterlist *src, unsigned int nbytes,
1222 			       unsigned int block_size, gfp_t flags)
1223 {
1224 	struct ahash_req_ctx *areq_ctx = (struct ahash_req_ctx *)ctx;
1225 	struct device *dev = drvdata_to_dev(drvdata);
1226 	u8 *curr_buff = cc_hash_buf(areq_ctx);
1227 	u32 *curr_buff_cnt = cc_hash_buf_cnt(areq_ctx);
1228 	u8 *next_buff = cc_next_buf(areq_ctx);
1229 	u32 *next_buff_cnt = cc_next_buf_cnt(areq_ctx);
1230 	struct mlli_params *mlli_params = &areq_ctx->mlli_params;
1231 	unsigned int update_data_len;
1232 	u32 total_in_len = nbytes + *curr_buff_cnt;
1233 	struct buffer_array sg_data;
1234 	unsigned int swap_index = 0;
1235 	int rc = 0;
1236 	u32 dummy = 0;
1237 	u32 mapped_nents = 0;
1238 
1239 	dev_dbg(dev, " update params : curr_buff=%pK curr_buff_cnt=0x%X nbytes=0x%X src=%pK curr_index=%u\n",
1240 		curr_buff, *curr_buff_cnt, nbytes, src, areq_ctx->buff_index);
1241 	/* Init the type of the dma buffer */
1242 	areq_ctx->data_dma_buf_type = CC_DMA_BUF_NULL;
1243 	mlli_params->curr_pool = NULL;
1244 	areq_ctx->curr_sg = NULL;
1245 	sg_data.num_of_buffers = 0;
1246 	areq_ctx->in_nents = 0;
1247 
1248 	if (total_in_len < block_size) {
1249 		dev_dbg(dev, " less than one block: curr_buff=%pK *curr_buff_cnt=0x%X copy_to=%pK\n",
1250 			curr_buff, *curr_buff_cnt, &curr_buff[*curr_buff_cnt]);
1251 		areq_ctx->in_nents = sg_nents_for_len(src, nbytes);
1252 		sg_copy_to_buffer(src, areq_ctx->in_nents,
1253 				  &curr_buff[*curr_buff_cnt], nbytes);
1254 		*curr_buff_cnt += nbytes;
1255 		return 1;
1256 	}
1257 
1258 	/* Calculate the residue size*/
1259 	*next_buff_cnt = total_in_len & (block_size - 1);
1260 	/* update data len */
1261 	update_data_len = total_in_len - *next_buff_cnt;
1262 
1263 	dev_dbg(dev, " temp length : *next_buff_cnt=0x%X update_data_len=0x%X\n",
1264 		*next_buff_cnt, update_data_len);
1265 
1266 	/* Copy the new residue to next buffer */
1267 	if (*next_buff_cnt) {
1268 		dev_dbg(dev, " handle residue: next buff %pK skip data %u residue %u\n",
1269 			next_buff, (update_data_len - *curr_buff_cnt),
1270 			*next_buff_cnt);
1271 		cc_copy_sg_portion(dev, next_buff, src,
1272 				   (update_data_len - *curr_buff_cnt),
1273 				   nbytes, CC_SG_TO_BUF);
1274 		/* change the buffer index for next operation */
1275 		swap_index = 1;
1276 	}
1277 
1278 	if (*curr_buff_cnt) {
1279 		rc = cc_set_hash_buf(dev, areq_ctx, curr_buff, *curr_buff_cnt,
1280 				     &sg_data);
1281 		if (rc)
1282 			return rc;
1283 		/* change the buffer index for next operation */
1284 		swap_index = 1;
1285 	}
1286 
1287 	if (update_data_len > *curr_buff_cnt) {
1288 		rc = cc_map_sg(dev, src, (update_data_len - *curr_buff_cnt),
1289 			       DMA_TO_DEVICE, &areq_ctx->in_nents,
1290 			       LLI_MAX_NUM_OF_DATA_ENTRIES, &dummy,
1291 			       &mapped_nents);
1292 		if (rc)
1293 			goto unmap_curr_buff;
1294 		if (mapped_nents == 1 &&
1295 		    areq_ctx->data_dma_buf_type == CC_DMA_BUF_NULL) {
1296 			/* only one entry in the SG and no previous data */
1297 			memcpy(areq_ctx->buff_sg, src,
1298 			       sizeof(struct scatterlist));
1299 			areq_ctx->buff_sg->length = update_data_len;
1300 			areq_ctx->data_dma_buf_type = CC_DMA_BUF_DLLI;
1301 			areq_ctx->curr_sg = areq_ctx->buff_sg;
1302 		} else {
1303 			areq_ctx->data_dma_buf_type = CC_DMA_BUF_MLLI;
1304 		}
1305 	}
1306 
1307 	if (areq_ctx->data_dma_buf_type == CC_DMA_BUF_MLLI) {
1308 		mlli_params->curr_pool = drvdata->mlli_buffs_pool;
1309 		/* add the src data to the sg_data */
1310 		cc_add_sg_entry(dev, &sg_data, areq_ctx->in_nents, src,
1311 				(update_data_len - *curr_buff_cnt), 0, true,
1312 				&areq_ctx->mlli_nents);
1313 		rc = cc_generate_mlli(dev, &sg_data, mlli_params, flags);
1314 		if (rc)
1315 			goto fail_unmap_din;
1316 	}
1317 	areq_ctx->buff_index = (areq_ctx->buff_index ^ swap_index);
1318 
1319 	return 0;
1320 
1321 fail_unmap_din:
1322 	dma_unmap_sg(dev, src, areq_ctx->in_nents, DMA_TO_DEVICE);
1323 
1324 unmap_curr_buff:
1325 	if (*curr_buff_cnt)
1326 		dma_unmap_sg(dev, areq_ctx->buff_sg, 1, DMA_TO_DEVICE);
1327 
1328 	return rc;
1329 }
1330 
1331 void cc_unmap_hash_request(struct device *dev, void *ctx,
1332 			   struct scatterlist *src, bool do_revert)
1333 {
1334 	struct ahash_req_ctx *areq_ctx = (struct ahash_req_ctx *)ctx;
1335 	u32 *prev_len = cc_next_buf_cnt(areq_ctx);
1336 
1337 	/*In case a pool was set, a table was
1338 	 *allocated and should be released
1339 	 */
1340 	if (areq_ctx->mlli_params.curr_pool) {
1341 		dev_dbg(dev, "free MLLI buffer: dma=%pad virt=%pK\n",
1342 			&areq_ctx->mlli_params.mlli_dma_addr,
1343 			areq_ctx->mlli_params.mlli_virt_addr);
1344 		dma_pool_free(areq_ctx->mlli_params.curr_pool,
1345 			      areq_ctx->mlli_params.mlli_virt_addr,
1346 			      areq_ctx->mlli_params.mlli_dma_addr);
1347 	}
1348 
1349 	if (src && areq_ctx->in_nents) {
1350 		dev_dbg(dev, "Unmapped sg src: virt=%pK dma=%pad len=0x%X\n",
1351 			sg_virt(src), &sg_dma_address(src), sg_dma_len(src));
1352 		dma_unmap_sg(dev, src,
1353 			     areq_ctx->in_nents, DMA_TO_DEVICE);
1354 	}
1355 
1356 	if (*prev_len) {
1357 		dev_dbg(dev, "Unmapped buffer: areq_ctx->buff_sg=%pK dma=%pad len 0x%X\n",
1358 			sg_virt(areq_ctx->buff_sg),
1359 			&sg_dma_address(areq_ctx->buff_sg),
1360 			sg_dma_len(areq_ctx->buff_sg));
1361 		dma_unmap_sg(dev, areq_ctx->buff_sg, 1, DMA_TO_DEVICE);
1362 		if (!do_revert) {
1363 			/* clean the previous data length for update
1364 			 * operation
1365 			 */
1366 			*prev_len = 0;
1367 		} else {
1368 			areq_ctx->buff_index ^= 1;
1369 		}
1370 	}
1371 }
1372 
1373 int cc_buffer_mgr_init(struct cc_drvdata *drvdata)
1374 {
1375 	struct device *dev = drvdata_to_dev(drvdata);
1376 
1377 	drvdata->mlli_buffs_pool =
1378 		dma_pool_create("dx_single_mlli_tables", dev,
1379 				MAX_NUM_OF_TOTAL_MLLI_ENTRIES *
1380 				LLI_ENTRY_BYTE_SIZE,
1381 				MLLI_TABLE_MIN_ALIGNMENT, 0);
1382 
1383 	if (!drvdata->mlli_buffs_pool)
1384 		return -ENOMEM;
1385 
1386 	return 0;
1387 }
1388 
1389 int cc_buffer_mgr_fini(struct cc_drvdata *drvdata)
1390 {
1391 	dma_pool_destroy(drvdata->mlli_buffs_pool);
1392 	return 0;
1393 }
1394