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ae0222b7 KY |
1 | /** |
2 | * Routines supporting the Power 7+ Nest Accelerators driver | |
3 | * | |
4 | * Copyright (C) 2011-2012 International Business Machines Inc. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; version 2 only. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | * | |
19 | * Author: Kent Yoder <yoder1@us.ibm.com> | |
20 | */ | |
21 | ||
22 | #include <crypto/internal/hash.h> | |
23 | #include <crypto/hash.h> | |
24 | #include <crypto/aes.h> | |
25 | #include <crypto/sha.h> | |
26 | #include <crypto/algapi.h> | |
27 | #include <crypto/scatterwalk.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/moduleparam.h> | |
30 | #include <linux/types.h> | |
31 | #include <linux/mm.h> | |
32 | #include <linux/crypto.h> | |
33 | #include <linux/scatterlist.h> | |
34 | #include <linux/device.h> | |
35 | #include <linux/of.h> | |
ae0222b7 KY |
36 | #include <asm/hvcall.h> |
37 | #include <asm/vio.h> | |
38 | ||
39 | #include "nx_csbcpb.h" | |
40 | #include "nx.h" | |
41 | ||
42 | ||
43 | /** | |
44 | * nx_hcall_sync - make an H_COP_OP hcall for the passed in op structure | |
45 | * | |
46 | * @nx_ctx: the crypto context handle | |
47 | * @op: PFO operation struct to pass in | |
48 | * @may_sleep: flag indicating the request can sleep | |
49 | * | |
50 | * Make the hcall, retrying while the hardware is busy. If we cannot yield | |
51 | * the thread, limit the number of retries to 10 here. | |
52 | */ | |
53 | int nx_hcall_sync(struct nx_crypto_ctx *nx_ctx, | |
54 | struct vio_pfo_op *op, | |
55 | u32 may_sleep) | |
56 | { | |
57 | int rc, retries = 10; | |
58 | struct vio_dev *viodev = nx_driver.viodev; | |
59 | ||
60 | atomic_inc(&(nx_ctx->stats->sync_ops)); | |
61 | ||
62 | do { | |
63 | rc = vio_h_cop_sync(viodev, op); | |
64 | } while ((rc == -EBUSY && !may_sleep && retries--) || | |
65 | (rc == -EBUSY && may_sleep && cond_resched())); | |
66 | ||
67 | if (rc) { | |
68 | dev_dbg(&viodev->dev, "vio_h_cop_sync failed: rc: %d " | |
69 | "hcall rc: %ld\n", rc, op->hcall_err); | |
70 | atomic_inc(&(nx_ctx->stats->errors)); | |
71 | atomic_set(&(nx_ctx->stats->last_error), op->hcall_err); | |
72 | atomic_set(&(nx_ctx->stats->last_error_pid), current->pid); | |
73 | } | |
74 | ||
75 | return rc; | |
76 | } | |
77 | ||
78 | /** | |
79 | * nx_build_sg_list - build an NX scatter list describing a single buffer | |
80 | * | |
81 | * @sg_head: pointer to the first scatter list element to build | |
82 | * @start_addr: pointer to the linear buffer | |
83 | * @len: length of the data at @start_addr | |
84 | * @sgmax: the largest number of scatter list elements we're allowed to create | |
85 | * | |
86 | * This function will start writing nx_sg elements at @sg_head and keep | |
87 | * writing them until all of the data from @start_addr is described or | |
88 | * until sgmax elements have been written. Scatter list elements will be | |
89 | * created such that none of the elements describes a buffer that crosses a 4K | |
90 | * boundary. | |
91 | */ | |
92 | struct nx_sg *nx_build_sg_list(struct nx_sg *sg_head, | |
93 | u8 *start_addr, | |
94 | unsigned int len, | |
95 | u32 sgmax) | |
96 | { | |
97 | unsigned int sg_len = 0; | |
98 | struct nx_sg *sg; | |
99 | u64 sg_addr = (u64)start_addr; | |
100 | u64 end_addr; | |
101 | ||
102 | /* determine the start and end for this address range - slightly | |
103 | * different if this is in VMALLOC_REGION */ | |
104 | if (is_vmalloc_addr(start_addr)) | |
7187dafc | 105 | sg_addr = page_to_phys(vmalloc_to_page(start_addr)) |
ae0222b7 KY |
106 | + offset_in_page(sg_addr); |
107 | else | |
7187dafc | 108 | sg_addr = __pa(sg_addr); |
ae0222b7 KY |
109 | |
110 | end_addr = sg_addr + len; | |
111 | ||
112 | /* each iteration will write one struct nx_sg element and add the | |
113 | * length of data described by that element to sg_len. Once @len bytes | |
114 | * have been described (or @sgmax elements have been written), the | |
115 | * loop ends. min_t is used to ensure @end_addr falls on the same page | |
116 | * as sg_addr, if not, we need to create another nx_sg element for the | |
117 | * data on the next page */ | |
118 | for (sg = sg_head; sg_len < len; sg++) { | |
119 | sg->addr = sg_addr; | |
120 | sg_addr = min_t(u64, NX_PAGE_NUM(sg_addr + NX_PAGE_SIZE), end_addr); | |
121 | sg->len = sg_addr - sg->addr; | |
122 | sg_len += sg->len; | |
123 | ||
124 | if ((sg - sg_head) == sgmax) { | |
125 | pr_err("nx: scatter/gather list overflow, pid: %d\n", | |
126 | current->pid); | |
127 | return NULL; | |
128 | } | |
129 | } | |
130 | ||
131 | /* return the moved sg_head pointer */ | |
132 | return sg; | |
133 | } | |
134 | ||
135 | /** | |
136 | * nx_walk_and_build - walk a linux scatterlist and build an nx scatterlist | |
137 | * | |
138 | * @nx_dst: pointer to the first nx_sg element to write | |
139 | * @sglen: max number of nx_sg entries we're allowed to write | |
140 | * @sg_src: pointer to the source linux scatterlist to walk | |
141 | * @start: number of bytes to fast-forward past at the beginning of @sg_src | |
142 | * @src_len: number of bytes to walk in @sg_src | |
143 | */ | |
144 | struct nx_sg *nx_walk_and_build(struct nx_sg *nx_dst, | |
145 | unsigned int sglen, | |
146 | struct scatterlist *sg_src, | |
147 | unsigned int start, | |
148 | unsigned int src_len) | |
149 | { | |
150 | struct scatter_walk walk; | |
151 | struct nx_sg *nx_sg = nx_dst; | |
152 | unsigned int n, offset = 0, len = src_len; | |
153 | char *dst; | |
154 | ||
155 | /* we need to fast forward through @start bytes first */ | |
156 | for (;;) { | |
157 | scatterwalk_start(&walk, sg_src); | |
158 | ||
159 | if (start < offset + sg_src->length) | |
160 | break; | |
161 | ||
162 | offset += sg_src->length; | |
163 | sg_src = scatterwalk_sg_next(sg_src); | |
164 | } | |
165 | ||
166 | /* start - offset is the number of bytes to advance in the scatterlist | |
167 | * element we're currently looking at */ | |
168 | scatterwalk_advance(&walk, start - offset); | |
169 | ||
170 | while (len && nx_sg) { | |
171 | n = scatterwalk_clamp(&walk, len); | |
172 | if (!n) { | |
173 | scatterwalk_start(&walk, sg_next(walk.sg)); | |
174 | n = scatterwalk_clamp(&walk, len); | |
175 | } | |
176 | dst = scatterwalk_map(&walk); | |
177 | ||
178 | nx_sg = nx_build_sg_list(nx_sg, dst, n, sglen); | |
179 | len -= n; | |
180 | ||
181 | scatterwalk_unmap(dst); | |
182 | scatterwalk_advance(&walk, n); | |
183 | scatterwalk_done(&walk, SCATTERWALK_FROM_SG, len); | |
184 | } | |
185 | ||
186 | /* return the moved destination pointer */ | |
187 | return nx_sg; | |
188 | } | |
189 | ||
190 | /** | |
191 | * nx_build_sg_lists - walk the input scatterlists and build arrays of NX | |
192 | * scatterlists based on them. | |
193 | * | |
194 | * @nx_ctx: NX crypto context for the lists we're building | |
195 | * @desc: the block cipher descriptor for the operation | |
196 | * @dst: destination scatterlist | |
197 | * @src: source scatterlist | |
198 | * @nbytes: length of data described in the scatterlists | |
199 | * @iv: destination for the iv data, if the algorithm requires it | |
200 | * | |
201 | * This is common code shared by all the AES algorithms. It uses the block | |
202 | * cipher walk routines to traverse input and output scatterlists, building | |
203 | * corresponding NX scatterlists | |
204 | */ | |
205 | int nx_build_sg_lists(struct nx_crypto_ctx *nx_ctx, | |
206 | struct blkcipher_desc *desc, | |
207 | struct scatterlist *dst, | |
208 | struct scatterlist *src, | |
209 | unsigned int nbytes, | |
210 | u8 *iv) | |
211 | { | |
212 | struct nx_sg *nx_insg = nx_ctx->in_sg; | |
213 | struct nx_sg *nx_outsg = nx_ctx->out_sg; | |
ae0222b7 KY |
214 | |
215 | if (iv) | |
1ad936e8 | 216 | memcpy(iv, desc->info, AES_BLOCK_SIZE); |
ae0222b7 | 217 | |
1ad936e8 KY |
218 | nx_insg = nx_walk_and_build(nx_insg, nx_ctx->ap->sglen, src, 0, nbytes); |
219 | nx_outsg = nx_walk_and_build(nx_outsg, nx_ctx->ap->sglen, dst, 0, nbytes); | |
ae0222b7 KY |
220 | |
221 | /* these lengths should be negative, which will indicate to phyp that | |
222 | * the input and output parameters are scatterlists, not linear | |
223 | * buffers */ | |
224 | nx_ctx->op.inlen = (nx_ctx->in_sg - nx_insg) * sizeof(struct nx_sg); | |
225 | nx_ctx->op.outlen = (nx_ctx->out_sg - nx_outsg) * sizeof(struct nx_sg); | |
1ad936e8 KY |
226 | |
227 | return 0; | |
ae0222b7 KY |
228 | } |
229 | ||
230 | /** | |
231 | * nx_ctx_init - initialize an nx_ctx's vio_pfo_op struct | |
232 | * | |
233 | * @nx_ctx: the nx context to initialize | |
234 | * @function: the function code for the op | |
235 | */ | |
236 | void nx_ctx_init(struct nx_crypto_ctx *nx_ctx, unsigned int function) | |
237 | { | |
238 | memset(nx_ctx->kmem, 0, nx_ctx->kmem_len); | |
239 | nx_ctx->csbcpb->csb.valid |= NX_CSB_VALID_BIT; | |
240 | ||
241 | nx_ctx->op.flags = function; | |
7187dafc ME |
242 | nx_ctx->op.csbcpb = __pa(nx_ctx->csbcpb); |
243 | nx_ctx->op.in = __pa(nx_ctx->in_sg); | |
244 | nx_ctx->op.out = __pa(nx_ctx->out_sg); | |
ae0222b7 KY |
245 | |
246 | if (nx_ctx->csbcpb_aead) { | |
247 | nx_ctx->csbcpb_aead->csb.valid |= NX_CSB_VALID_BIT; | |
248 | ||
249 | nx_ctx->op_aead.flags = function; | |
7187dafc ME |
250 | nx_ctx->op_aead.csbcpb = __pa(nx_ctx->csbcpb_aead); |
251 | nx_ctx->op_aead.in = __pa(nx_ctx->in_sg); | |
252 | nx_ctx->op_aead.out = __pa(nx_ctx->out_sg); | |
ae0222b7 KY |
253 | } |
254 | } | |
255 | ||
256 | static void nx_of_update_status(struct device *dev, | |
257 | struct property *p, | |
258 | struct nx_of *props) | |
259 | { | |
260 | if (!strncmp(p->value, "okay", p->length)) { | |
261 | props->status = NX_WAITING; | |
262 | props->flags |= NX_OF_FLAG_STATUS_SET; | |
263 | } else { | |
264 | dev_info(dev, "%s: status '%s' is not 'okay'\n", __func__, | |
265 | (char *)p->value); | |
266 | } | |
267 | } | |
268 | ||
269 | static void nx_of_update_sglen(struct device *dev, | |
270 | struct property *p, | |
271 | struct nx_of *props) | |
272 | { | |
273 | if (p->length != sizeof(props->max_sg_len)) { | |
274 | dev_err(dev, "%s: unexpected format for " | |
275 | "ibm,max-sg-len property\n", __func__); | |
276 | dev_dbg(dev, "%s: ibm,max-sg-len is %d bytes " | |
277 | "long, expected %zd bytes\n", __func__, | |
278 | p->length, sizeof(props->max_sg_len)); | |
279 | return; | |
280 | } | |
281 | ||
282 | props->max_sg_len = *(u32 *)p->value; | |
283 | props->flags |= NX_OF_FLAG_MAXSGLEN_SET; | |
284 | } | |
285 | ||
286 | static void nx_of_update_msc(struct device *dev, | |
287 | struct property *p, | |
288 | struct nx_of *props) | |
289 | { | |
290 | struct msc_triplet *trip; | |
291 | struct max_sync_cop *msc; | |
292 | unsigned int bytes_so_far, i, lenp; | |
293 | ||
294 | msc = (struct max_sync_cop *)p->value; | |
295 | lenp = p->length; | |
296 | ||
297 | /* You can't tell if the data read in for this property is sane by its | |
298 | * size alone. This is because there are sizes embedded in the data | |
299 | * structure. The best we can do is check lengths as we parse and bail | |
300 | * as soon as a length error is detected. */ | |
301 | bytes_so_far = 0; | |
302 | ||
303 | while ((bytes_so_far + sizeof(struct max_sync_cop)) <= lenp) { | |
304 | bytes_so_far += sizeof(struct max_sync_cop); | |
305 | ||
306 | trip = msc->trip; | |
307 | ||
308 | for (i = 0; | |
309 | ((bytes_so_far + sizeof(struct msc_triplet)) <= lenp) && | |
310 | i < msc->triplets; | |
311 | i++) { | |
c0a803c1 | 312 | if (msc->fc >= NX_MAX_FC || msc->mode >= NX_MAX_MODE) { |
ae0222b7 KY |
313 | dev_err(dev, "unknown function code/mode " |
314 | "combo: %d/%d (ignored)\n", msc->fc, | |
315 | msc->mode); | |
316 | goto next_loop; | |
317 | } | |
318 | ||
319 | switch (trip->keybitlen) { | |
320 | case 128: | |
321 | case 160: | |
322 | props->ap[msc->fc][msc->mode][0].databytelen = | |
323 | trip->databytelen; | |
324 | props->ap[msc->fc][msc->mode][0].sglen = | |
325 | trip->sglen; | |
326 | break; | |
327 | case 192: | |
328 | props->ap[msc->fc][msc->mode][1].databytelen = | |
329 | trip->databytelen; | |
330 | props->ap[msc->fc][msc->mode][1].sglen = | |
331 | trip->sglen; | |
332 | break; | |
333 | case 256: | |
334 | if (msc->fc == NX_FC_AES) { | |
335 | props->ap[msc->fc][msc->mode][2]. | |
336 | databytelen = trip->databytelen; | |
337 | props->ap[msc->fc][msc->mode][2].sglen = | |
338 | trip->sglen; | |
339 | } else if (msc->fc == NX_FC_AES_HMAC || | |
340 | msc->fc == NX_FC_SHA) { | |
341 | props->ap[msc->fc][msc->mode][1]. | |
342 | databytelen = trip->databytelen; | |
343 | props->ap[msc->fc][msc->mode][1].sglen = | |
344 | trip->sglen; | |
345 | } else { | |
346 | dev_warn(dev, "unknown function " | |
347 | "code/key bit len combo" | |
348 | ": (%u/256)\n", msc->fc); | |
349 | } | |
350 | break; | |
351 | case 512: | |
352 | props->ap[msc->fc][msc->mode][2].databytelen = | |
353 | trip->databytelen; | |
354 | props->ap[msc->fc][msc->mode][2].sglen = | |
355 | trip->sglen; | |
356 | break; | |
357 | default: | |
358 | dev_warn(dev, "unknown function code/key bit " | |
359 | "len combo: (%u/%u)\n", msc->fc, | |
360 | trip->keybitlen); | |
361 | break; | |
362 | } | |
363 | next_loop: | |
364 | bytes_so_far += sizeof(struct msc_triplet); | |
365 | trip++; | |
366 | } | |
367 | ||
368 | msc = (struct max_sync_cop *)trip; | |
369 | } | |
370 | ||
371 | props->flags |= NX_OF_FLAG_MAXSYNCCOP_SET; | |
372 | } | |
373 | ||
374 | /** | |
375 | * nx_of_init - read openFirmware values from the device tree | |
376 | * | |
377 | * @dev: device handle | |
378 | * @props: pointer to struct to hold the properties values | |
379 | * | |
380 | * Called once at driver probe time, this function will read out the | |
381 | * openFirmware properties we use at runtime. If all the OF properties are | |
382 | * acceptable, when we exit this function props->flags will indicate that | |
383 | * we're ready to register our crypto algorithms. | |
384 | */ | |
385 | static void nx_of_init(struct device *dev, struct nx_of *props) | |
386 | { | |
387 | struct device_node *base_node = dev->of_node; | |
388 | struct property *p; | |
389 | ||
390 | p = of_find_property(base_node, "status", NULL); | |
391 | if (!p) | |
392 | dev_info(dev, "%s: property 'status' not found\n", __func__); | |
393 | else | |
394 | nx_of_update_status(dev, p, props); | |
395 | ||
396 | p = of_find_property(base_node, "ibm,max-sg-len", NULL); | |
397 | if (!p) | |
398 | dev_info(dev, "%s: property 'ibm,max-sg-len' not found\n", | |
399 | __func__); | |
400 | else | |
401 | nx_of_update_sglen(dev, p, props); | |
402 | ||
403 | p = of_find_property(base_node, "ibm,max-sync-cop", NULL); | |
404 | if (!p) | |
405 | dev_info(dev, "%s: property 'ibm,max-sync-cop' not found\n", | |
406 | __func__); | |
407 | else | |
408 | nx_of_update_msc(dev, p, props); | |
409 | } | |
410 | ||
411 | /** | |
412 | * nx_register_algs - register algorithms with the crypto API | |
413 | * | |
414 | * Called from nx_probe() | |
415 | * | |
416 | * If all OF properties are in an acceptable state, the driver flags will | |
417 | * indicate that we're ready and we'll create our debugfs files and register | |
418 | * out crypto algorithms. | |
419 | */ | |
420 | static int nx_register_algs(void) | |
421 | { | |
422 | int rc = -1; | |
423 | ||
424 | if (nx_driver.of.flags != NX_OF_FLAG_MASK_READY) | |
425 | goto out; | |
426 | ||
427 | memset(&nx_driver.stats, 0, sizeof(struct nx_stats)); | |
428 | ||
429 | rc = NX_DEBUGFS_INIT(&nx_driver); | |
430 | if (rc) | |
431 | goto out; | |
432 | ||
1ad936e8 KY |
433 | nx_driver.of.status = NX_OKAY; |
434 | ||
ae0222b7 KY |
435 | rc = crypto_register_alg(&nx_ecb_aes_alg); |
436 | if (rc) | |
437 | goto out; | |
438 | ||
439 | rc = crypto_register_alg(&nx_cbc_aes_alg); | |
440 | if (rc) | |
441 | goto out_unreg_ecb; | |
442 | ||
443 | rc = crypto_register_alg(&nx_ctr_aes_alg); | |
444 | if (rc) | |
445 | goto out_unreg_cbc; | |
446 | ||
447 | rc = crypto_register_alg(&nx_ctr3686_aes_alg); | |
448 | if (rc) | |
449 | goto out_unreg_ctr; | |
450 | ||
451 | rc = crypto_register_alg(&nx_gcm_aes_alg); | |
452 | if (rc) | |
453 | goto out_unreg_ctr3686; | |
454 | ||
455 | rc = crypto_register_alg(&nx_gcm4106_aes_alg); | |
456 | if (rc) | |
457 | goto out_unreg_gcm; | |
458 | ||
459 | rc = crypto_register_alg(&nx_ccm_aes_alg); | |
460 | if (rc) | |
461 | goto out_unreg_gcm4106; | |
462 | ||
463 | rc = crypto_register_alg(&nx_ccm4309_aes_alg); | |
464 | if (rc) | |
465 | goto out_unreg_ccm; | |
466 | ||
467 | rc = crypto_register_shash(&nx_shash_sha256_alg); | |
468 | if (rc) | |
469 | goto out_unreg_ccm4309; | |
470 | ||
471 | rc = crypto_register_shash(&nx_shash_sha512_alg); | |
472 | if (rc) | |
473 | goto out_unreg_s256; | |
474 | ||
475 | rc = crypto_register_shash(&nx_shash_aes_xcbc_alg); | |
476 | if (rc) | |
477 | goto out_unreg_s512; | |
478 | ||
ae0222b7 KY |
479 | goto out; |
480 | ||
481 | out_unreg_s512: | |
482 | crypto_unregister_shash(&nx_shash_sha512_alg); | |
483 | out_unreg_s256: | |
484 | crypto_unregister_shash(&nx_shash_sha256_alg); | |
485 | out_unreg_ccm4309: | |
486 | crypto_unregister_alg(&nx_ccm4309_aes_alg); | |
487 | out_unreg_ccm: | |
488 | crypto_unregister_alg(&nx_ccm_aes_alg); | |
489 | out_unreg_gcm4106: | |
490 | crypto_unregister_alg(&nx_gcm4106_aes_alg); | |
491 | out_unreg_gcm: | |
492 | crypto_unregister_alg(&nx_gcm_aes_alg); | |
493 | out_unreg_ctr3686: | |
494 | crypto_unregister_alg(&nx_ctr3686_aes_alg); | |
495 | out_unreg_ctr: | |
496 | crypto_unregister_alg(&nx_ctr_aes_alg); | |
497 | out_unreg_cbc: | |
498 | crypto_unregister_alg(&nx_cbc_aes_alg); | |
499 | out_unreg_ecb: | |
500 | crypto_unregister_alg(&nx_ecb_aes_alg); | |
501 | out: | |
502 | return rc; | |
503 | } | |
504 | ||
505 | /** | |
506 | * nx_crypto_ctx_init - create and initialize a crypto api context | |
507 | * | |
508 | * @nx_ctx: the crypto api context | |
509 | * @fc: function code for the context | |
510 | * @mode: the function code specific mode for this context | |
511 | */ | |
512 | static int nx_crypto_ctx_init(struct nx_crypto_ctx *nx_ctx, u32 fc, u32 mode) | |
513 | { | |
514 | if (nx_driver.of.status != NX_OKAY) { | |
515 | pr_err("Attempt to initialize NX crypto context while device " | |
516 | "is not available!\n"); | |
517 | return -ENODEV; | |
518 | } | |
519 | ||
520 | /* we need an extra page for csbcpb_aead for these modes */ | |
521 | if (mode == NX_MODE_AES_GCM || mode == NX_MODE_AES_CCM) | |
522 | nx_ctx->kmem_len = (4 * NX_PAGE_SIZE) + | |
523 | sizeof(struct nx_csbcpb); | |
524 | else | |
525 | nx_ctx->kmem_len = (3 * NX_PAGE_SIZE) + | |
526 | sizeof(struct nx_csbcpb); | |
527 | ||
528 | nx_ctx->kmem = kmalloc(nx_ctx->kmem_len, GFP_KERNEL); | |
529 | if (!nx_ctx->kmem) | |
530 | return -ENOMEM; | |
531 | ||
532 | /* the csbcpb and scatterlists must be 4K aligned pages */ | |
533 | nx_ctx->csbcpb = (struct nx_csbcpb *)(round_up((u64)nx_ctx->kmem, | |
534 | (u64)NX_PAGE_SIZE)); | |
535 | nx_ctx->in_sg = (struct nx_sg *)((u8 *)nx_ctx->csbcpb + NX_PAGE_SIZE); | |
536 | nx_ctx->out_sg = (struct nx_sg *)((u8 *)nx_ctx->in_sg + NX_PAGE_SIZE); | |
537 | ||
538 | if (mode == NX_MODE_AES_GCM || mode == NX_MODE_AES_CCM) | |
539 | nx_ctx->csbcpb_aead = | |
540 | (struct nx_csbcpb *)((u8 *)nx_ctx->out_sg + | |
541 | NX_PAGE_SIZE); | |
542 | ||
543 | /* give each context a pointer to global stats and their OF | |
544 | * properties */ | |
545 | nx_ctx->stats = &nx_driver.stats; | |
546 | memcpy(nx_ctx->props, nx_driver.of.ap[fc][mode], | |
547 | sizeof(struct alg_props) * 3); | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
552 | /* entry points from the crypto tfm initializers */ | |
553 | int nx_crypto_ctx_aes_ccm_init(struct crypto_tfm *tfm) | |
554 | { | |
555 | return nx_crypto_ctx_init(crypto_tfm_ctx(tfm), NX_FC_AES, | |
556 | NX_MODE_AES_CCM); | |
557 | } | |
558 | ||
559 | int nx_crypto_ctx_aes_gcm_init(struct crypto_tfm *tfm) | |
560 | { | |
561 | return nx_crypto_ctx_init(crypto_tfm_ctx(tfm), NX_FC_AES, | |
562 | NX_MODE_AES_GCM); | |
563 | } | |
564 | ||
565 | int nx_crypto_ctx_aes_ctr_init(struct crypto_tfm *tfm) | |
566 | { | |
567 | return nx_crypto_ctx_init(crypto_tfm_ctx(tfm), NX_FC_AES, | |
568 | NX_MODE_AES_CTR); | |
569 | } | |
570 | ||
571 | int nx_crypto_ctx_aes_cbc_init(struct crypto_tfm *tfm) | |
572 | { | |
573 | return nx_crypto_ctx_init(crypto_tfm_ctx(tfm), NX_FC_AES, | |
574 | NX_MODE_AES_CBC); | |
575 | } | |
576 | ||
577 | int nx_crypto_ctx_aes_ecb_init(struct crypto_tfm *tfm) | |
578 | { | |
579 | return nx_crypto_ctx_init(crypto_tfm_ctx(tfm), NX_FC_AES, | |
580 | NX_MODE_AES_ECB); | |
581 | } | |
582 | ||
583 | int nx_crypto_ctx_sha_init(struct crypto_tfm *tfm) | |
584 | { | |
585 | return nx_crypto_ctx_init(crypto_tfm_ctx(tfm), NX_FC_SHA, NX_MODE_SHA); | |
586 | } | |
587 | ||
588 | int nx_crypto_ctx_aes_xcbc_init(struct crypto_tfm *tfm) | |
589 | { | |
590 | return nx_crypto_ctx_init(crypto_tfm_ctx(tfm), NX_FC_AES, | |
591 | NX_MODE_AES_XCBC_MAC); | |
592 | } | |
593 | ||
594 | /** | |
595 | * nx_crypto_ctx_exit - destroy a crypto api context | |
596 | * | |
597 | * @tfm: the crypto transform pointer for the context | |
598 | * | |
599 | * As crypto API contexts are destroyed, this exit hook is called to free the | |
600 | * memory associated with it. | |
601 | */ | |
602 | void nx_crypto_ctx_exit(struct crypto_tfm *tfm) | |
603 | { | |
604 | struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm); | |
605 | ||
606 | kzfree(nx_ctx->kmem); | |
607 | nx_ctx->csbcpb = NULL; | |
608 | nx_ctx->csbcpb_aead = NULL; | |
609 | nx_ctx->in_sg = NULL; | |
610 | nx_ctx->out_sg = NULL; | |
611 | } | |
612 | ||
49cfe4db | 613 | static int nx_probe(struct vio_dev *viodev, const struct vio_device_id *id) |
ae0222b7 KY |
614 | { |
615 | dev_dbg(&viodev->dev, "driver probed: %s resource id: 0x%x\n", | |
616 | viodev->name, viodev->resource_id); | |
617 | ||
618 | if (nx_driver.viodev) { | |
619 | dev_err(&viodev->dev, "%s: Attempt to register more than one " | |
620 | "instance of the hardware\n", __func__); | |
621 | return -EINVAL; | |
622 | } | |
623 | ||
624 | nx_driver.viodev = viodev; | |
625 | ||
626 | nx_of_init(&viodev->dev, &nx_driver.of); | |
627 | ||
628 | return nx_register_algs(); | |
629 | } | |
630 | ||
49cfe4db | 631 | static int nx_remove(struct vio_dev *viodev) |
ae0222b7 KY |
632 | { |
633 | dev_dbg(&viodev->dev, "entering nx_remove for UA 0x%x\n", | |
634 | viodev->unit_address); | |
635 | ||
636 | if (nx_driver.of.status == NX_OKAY) { | |
637 | NX_DEBUGFS_FINI(&nx_driver); | |
638 | ||
639 | crypto_unregister_alg(&nx_ccm_aes_alg); | |
640 | crypto_unregister_alg(&nx_ccm4309_aes_alg); | |
641 | crypto_unregister_alg(&nx_gcm_aes_alg); | |
642 | crypto_unregister_alg(&nx_gcm4106_aes_alg); | |
643 | crypto_unregister_alg(&nx_ctr_aes_alg); | |
644 | crypto_unregister_alg(&nx_ctr3686_aes_alg); | |
645 | crypto_unregister_alg(&nx_cbc_aes_alg); | |
646 | crypto_unregister_alg(&nx_ecb_aes_alg); | |
647 | crypto_unregister_shash(&nx_shash_sha256_alg); | |
648 | crypto_unregister_shash(&nx_shash_sha512_alg); | |
649 | crypto_unregister_shash(&nx_shash_aes_xcbc_alg); | |
650 | } | |
651 | ||
652 | return 0; | |
653 | } | |
654 | ||
655 | ||
656 | /* module wide initialization/cleanup */ | |
657 | static int __init nx_init(void) | |
658 | { | |
659 | return vio_register_driver(&nx_driver.viodriver); | |
660 | } | |
661 | ||
662 | static void __exit nx_fini(void) | |
663 | { | |
664 | vio_unregister_driver(&nx_driver.viodriver); | |
665 | } | |
666 | ||
49cfe4db | 667 | static struct vio_device_id nx_crypto_driver_ids[] = { |
ae0222b7 KY |
668 | { "ibm,sym-encryption-v1", "ibm,sym-encryption" }, |
669 | { "", "" } | |
670 | }; | |
671 | MODULE_DEVICE_TABLE(vio, nx_crypto_driver_ids); | |
672 | ||
673 | /* driver state structure */ | |
674 | struct nx_crypto_driver nx_driver = { | |
675 | .viodriver = { | |
676 | .id_table = nx_crypto_driver_ids, | |
677 | .probe = nx_probe, | |
678 | .remove = nx_remove, | |
679 | .name = NX_NAME, | |
680 | }, | |
681 | }; | |
682 | ||
683 | module_init(nx_init); | |
684 | module_exit(nx_fini); | |
685 | ||
686 | MODULE_AUTHOR("Kent Yoder <yoder1@us.ibm.com>"); | |
687 | MODULE_DESCRIPTION(NX_STRING); | |
688 | MODULE_LICENSE("GPL"); | |
689 | MODULE_VERSION(NX_VERSION); |