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0e16aafb SJ |
1 | /* |
2 | * Driver for IBM Power 842 compression accelerator | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
17 | * | |
18 | * Copyright (C) IBM Corporation, 2012 | |
19 | * | |
20 | * Authors: Robert Jennings <rcj@linux.vnet.ibm.com> | |
21 | * Seth Jennings <sjenning@linux.vnet.ibm.com> | |
22 | */ | |
23 | ||
33b58b01 | 24 | #include <linux/kernel.h> |
0e16aafb | 25 | #include <linux/module.h> |
0e16aafb | 26 | #include <linux/nx842.h> |
33b58b01 ME |
27 | #include <linux/of.h> |
28 | #include <linux/slab.h> | |
29 | ||
30 | #include <asm/page.h> | |
31 | #include <asm/pSeries_reconfig.h> | |
32 | #include <asm/vio.h> | |
0e16aafb SJ |
33 | |
34 | #include "nx_csbcpb.h" /* struct nx_csbcpb */ | |
35 | ||
36 | #define MODULE_NAME "nx-compress" | |
37 | MODULE_LICENSE("GPL"); | |
38 | MODULE_AUTHOR("Robert Jennings <rcj@linux.vnet.ibm.com>"); | |
39 | MODULE_DESCRIPTION("842 H/W Compression driver for IBM Power processors"); | |
40 | ||
41 | #define SHIFT_4K 12 | |
42 | #define SHIFT_64K 16 | |
43 | #define SIZE_4K (1UL << SHIFT_4K) | |
44 | #define SIZE_64K (1UL << SHIFT_64K) | |
45 | ||
46 | /* IO buffer must be 128 byte aligned */ | |
47 | #define IO_BUFFER_ALIGN 128 | |
48 | ||
49 | struct nx842_header { | |
50 | int blocks_nr; /* number of compressed blocks */ | |
51 | int offset; /* offset of the first block (from beginning of header) */ | |
52 | int sizes[0]; /* size of compressed blocks */ | |
53 | }; | |
54 | ||
55 | static inline int nx842_header_size(const struct nx842_header *hdr) | |
56 | { | |
57 | return sizeof(struct nx842_header) + | |
58 | hdr->blocks_nr * sizeof(hdr->sizes[0]); | |
59 | } | |
60 | ||
61 | /* Macros for fields within nx_csbcpb */ | |
62 | /* Check the valid bit within the csbcpb valid field */ | |
63 | #define NX842_CSBCBP_VALID_CHK(x) (x & BIT_MASK(7)) | |
64 | ||
65 | /* CE macros operate on the completion_extension field bits in the csbcpb. | |
66 | * CE0 0=full completion, 1=partial completion | |
67 | * CE1 0=CE0 indicates completion, 1=termination (output may be modified) | |
68 | * CE2 0=processed_bytes is source bytes, 1=processed_bytes is target bytes */ | |
69 | #define NX842_CSBCPB_CE0(x) (x & BIT_MASK(7)) | |
70 | #define NX842_CSBCPB_CE1(x) (x & BIT_MASK(6)) | |
71 | #define NX842_CSBCPB_CE2(x) (x & BIT_MASK(5)) | |
72 | ||
73 | /* The NX unit accepts data only on 4K page boundaries */ | |
74 | #define NX842_HW_PAGE_SHIFT SHIFT_4K | |
75 | #define NX842_HW_PAGE_SIZE (ASM_CONST(1) << NX842_HW_PAGE_SHIFT) | |
76 | #define NX842_HW_PAGE_MASK (~(NX842_HW_PAGE_SIZE-1)) | |
77 | ||
78 | enum nx842_status { | |
79 | UNAVAILABLE, | |
80 | AVAILABLE | |
81 | }; | |
82 | ||
83 | struct ibm_nx842_counters { | |
84 | atomic64_t comp_complete; | |
85 | atomic64_t comp_failed; | |
86 | atomic64_t decomp_complete; | |
87 | atomic64_t decomp_failed; | |
88 | atomic64_t swdecomp; | |
89 | atomic64_t comp_times[32]; | |
90 | atomic64_t decomp_times[32]; | |
91 | }; | |
92 | ||
93 | static struct nx842_devdata { | |
94 | struct vio_dev *vdev; | |
95 | struct device *dev; | |
96 | struct ibm_nx842_counters *counters; | |
97 | unsigned int max_sg_len; | |
98 | unsigned int max_sync_size; | |
99 | unsigned int max_sync_sg; | |
100 | enum nx842_status status; | |
101 | } __rcu *devdata; | |
102 | static DEFINE_SPINLOCK(devdata_mutex); | |
103 | ||
104 | #define NX842_COUNTER_INC(_x) \ | |
105 | static inline void nx842_inc_##_x( \ | |
106 | const struct nx842_devdata *dev) { \ | |
107 | if (dev) \ | |
108 | atomic64_inc(&dev->counters->_x); \ | |
109 | } | |
110 | NX842_COUNTER_INC(comp_complete); | |
111 | NX842_COUNTER_INC(comp_failed); | |
112 | NX842_COUNTER_INC(decomp_complete); | |
113 | NX842_COUNTER_INC(decomp_failed); | |
114 | NX842_COUNTER_INC(swdecomp); | |
115 | ||
116 | #define NX842_HIST_SLOTS 16 | |
117 | ||
118 | static void ibm_nx842_incr_hist(atomic64_t *times, unsigned int time) | |
119 | { | |
120 | int bucket = fls(time); | |
121 | ||
122 | if (bucket) | |
123 | bucket = min((NX842_HIST_SLOTS - 1), bucket - 1); | |
124 | ||
125 | atomic64_inc(×[bucket]); | |
126 | } | |
127 | ||
128 | /* NX unit operation flags */ | |
129 | #define NX842_OP_COMPRESS 0x0 | |
130 | #define NX842_OP_CRC 0x1 | |
131 | #define NX842_OP_DECOMPRESS 0x2 | |
132 | #define NX842_OP_COMPRESS_CRC (NX842_OP_COMPRESS | NX842_OP_CRC) | |
133 | #define NX842_OP_DECOMPRESS_CRC (NX842_OP_DECOMPRESS | NX842_OP_CRC) | |
134 | #define NX842_OP_ASYNC (1<<23) | |
135 | #define NX842_OP_NOTIFY (1<<22) | |
136 | #define NX842_OP_NOTIFY_INT(x) ((x & 0xff)<<8) | |
137 | ||
138 | static unsigned long nx842_get_desired_dma(struct vio_dev *viodev) | |
139 | { | |
140 | /* No use of DMA mappings within the driver. */ | |
141 | return 0; | |
142 | } | |
143 | ||
144 | struct nx842_slentry { | |
33b58b01 | 145 | unsigned long ptr; /* Real address (use __pa()) */ |
0e16aafb SJ |
146 | unsigned long len; |
147 | }; | |
148 | ||
149 | /* pHyp scatterlist entry */ | |
150 | struct nx842_scatterlist { | |
151 | int entry_nr; /* number of slentries */ | |
152 | struct nx842_slentry *entries; /* ptr to array of slentries */ | |
153 | }; | |
154 | ||
155 | /* Does not include sizeof(entry_nr) in the size */ | |
156 | static inline unsigned long nx842_get_scatterlist_size( | |
157 | struct nx842_scatterlist *sl) | |
158 | { | |
159 | return sl->entry_nr * sizeof(struct nx842_slentry); | |
160 | } | |
161 | ||
162 | static int nx842_build_scatterlist(unsigned long buf, int len, | |
163 | struct nx842_scatterlist *sl) | |
164 | { | |
165 | unsigned long nextpage; | |
166 | struct nx842_slentry *entry; | |
167 | ||
168 | sl->entry_nr = 0; | |
169 | ||
170 | entry = sl->entries; | |
171 | while (len) { | |
33b58b01 | 172 | entry->ptr = __pa(buf); |
0e16aafb SJ |
173 | nextpage = ALIGN(buf + 1, NX842_HW_PAGE_SIZE); |
174 | if (nextpage < buf + len) { | |
175 | /* we aren't at the end yet */ | |
176 | if (IS_ALIGNED(buf, NX842_HW_PAGE_SIZE)) | |
177 | /* we are in the middle (or beginning) */ | |
178 | entry->len = NX842_HW_PAGE_SIZE; | |
179 | else | |
180 | /* we are at the beginning */ | |
181 | entry->len = nextpage - buf; | |
182 | } else { | |
183 | /* at the end */ | |
184 | entry->len = len; | |
185 | } | |
186 | ||
187 | len -= entry->len; | |
188 | buf += entry->len; | |
189 | sl->entry_nr++; | |
190 | entry++; | |
191 | } | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | /* | |
197 | * Working memory for software decompression | |
198 | */ | |
199 | struct sw842_fifo { | |
200 | union { | |
201 | char f8[256][8]; | |
202 | char f4[512][4]; | |
203 | }; | |
204 | char f2[256][2]; | |
205 | unsigned char f84_full; | |
206 | unsigned char f2_full; | |
207 | unsigned char f8_count; | |
208 | unsigned char f2_count; | |
209 | unsigned int f4_count; | |
210 | }; | |
211 | ||
212 | /* | |
213 | * Working memory for crypto API | |
214 | */ | |
215 | struct nx842_workmem { | |
216 | char bounce[PAGE_SIZE]; /* bounce buffer for decompression input */ | |
217 | union { | |
218 | /* hardware working memory */ | |
219 | struct { | |
220 | /* scatterlist */ | |
221 | char slin[SIZE_4K]; | |
222 | char slout[SIZE_4K]; | |
223 | /* coprocessor status/parameter block */ | |
224 | struct nx_csbcpb csbcpb; | |
225 | }; | |
226 | /* software working memory */ | |
227 | struct sw842_fifo swfifo; /* software decompression fifo */ | |
228 | }; | |
229 | }; | |
230 | ||
231 | int nx842_get_workmem_size(void) | |
232 | { | |
233 | return sizeof(struct nx842_workmem) + NX842_HW_PAGE_SIZE; | |
234 | } | |
235 | EXPORT_SYMBOL_GPL(nx842_get_workmem_size); | |
236 | ||
237 | int nx842_get_workmem_size_aligned(void) | |
238 | { | |
239 | return sizeof(struct nx842_workmem); | |
240 | } | |
241 | EXPORT_SYMBOL_GPL(nx842_get_workmem_size_aligned); | |
242 | ||
243 | static int nx842_validate_result(struct device *dev, | |
244 | struct cop_status_block *csb) | |
245 | { | |
246 | /* The csb must be valid after returning from vio_h_cop_sync */ | |
247 | if (!NX842_CSBCBP_VALID_CHK(csb->valid)) { | |
248 | dev_err(dev, "%s: cspcbp not valid upon completion.\n", | |
249 | __func__); | |
250 | dev_dbg(dev, "valid:0x%02x cs:0x%02x cc:0x%02x ce:0x%02x\n", | |
251 | csb->valid, | |
252 | csb->crb_seq_number, | |
253 | csb->completion_code, | |
254 | csb->completion_extension); | |
255 | dev_dbg(dev, "processed_bytes:%d address:0x%016lx\n", | |
256 | csb->processed_byte_count, | |
257 | (unsigned long)csb->address); | |
258 | return -EIO; | |
259 | } | |
260 | ||
261 | /* Check return values from the hardware in the CSB */ | |
262 | switch (csb->completion_code) { | |
263 | case 0: /* Completed without error */ | |
264 | break; | |
265 | case 64: /* Target bytes > Source bytes during compression */ | |
266 | case 13: /* Output buffer too small */ | |
267 | dev_dbg(dev, "%s: Compression output larger than input\n", | |
268 | __func__); | |
269 | return -ENOSPC; | |
270 | case 66: /* Input data contains an illegal template field */ | |
271 | case 67: /* Template indicates data past the end of the input stream */ | |
272 | dev_dbg(dev, "%s: Bad data for decompression (code:%d)\n", | |
273 | __func__, csb->completion_code); | |
274 | return -EINVAL; | |
275 | default: | |
276 | dev_dbg(dev, "%s: Unspecified error (code:%d)\n", | |
277 | __func__, csb->completion_code); | |
278 | return -EIO; | |
279 | } | |
280 | ||
281 | /* Hardware sanity check */ | |
282 | if (!NX842_CSBCPB_CE2(csb->completion_extension)) { | |
283 | dev_err(dev, "%s: No error returned by hardware, but " | |
284 | "data returned is unusable, contact support.\n" | |
285 | "(Additional info: csbcbp->processed bytes " | |
286 | "does not specify processed bytes for the " | |
287 | "target buffer.)\n", __func__); | |
288 | return -EIO; | |
289 | } | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
294 | /** | |
295 | * nx842_compress - Compress data using the 842 algorithm | |
296 | * | |
297 | * Compression provide by the NX842 coprocessor on IBM Power systems. | |
298 | * The input buffer is compressed and the result is stored in the | |
299 | * provided output buffer. | |
300 | * | |
301 | * Upon return from this function @outlen contains the length of the | |
302 | * compressed data. If there is an error then @outlen will be 0 and an | |
303 | * error will be specified by the return code from this function. | |
304 | * | |
305 | * @in: Pointer to input buffer, must be page aligned | |
306 | * @inlen: Length of input buffer, must be PAGE_SIZE | |
307 | * @out: Pointer to output buffer | |
308 | * @outlen: Length of output buffer | |
309 | * @wrkmem: ptr to buffer for working memory, size determined by | |
310 | * nx842_get_workmem_size() | |
311 | * | |
312 | * Returns: | |
313 | * 0 Success, output of length @outlen stored in the buffer at @out | |
314 | * -ENOMEM Unable to allocate internal buffers | |
315 | * -ENOSPC Output buffer is to small | |
316 | * -EMSGSIZE XXX Difficult to describe this limitation | |
317 | * -EIO Internal error | |
318 | * -ENODEV Hardware unavailable | |
319 | */ | |
320 | int nx842_compress(const unsigned char *in, unsigned int inlen, | |
321 | unsigned char *out, unsigned int *outlen, void *wmem) | |
322 | { | |
323 | struct nx842_header *hdr; | |
324 | struct nx842_devdata *local_devdata; | |
325 | struct device *dev = NULL; | |
326 | struct nx842_workmem *workmem; | |
327 | struct nx842_scatterlist slin, slout; | |
328 | struct nx_csbcpb *csbcpb; | |
329 | int ret = 0, max_sync_size, i, bytesleft, size, hdrsize; | |
330 | unsigned long inbuf, outbuf, padding; | |
331 | struct vio_pfo_op op = { | |
332 | .done = NULL, | |
333 | .handle = 0, | |
334 | .timeout = 0, | |
335 | }; | |
336 | unsigned long start_time = get_tb(); | |
337 | ||
338 | /* | |
339 | * Make sure input buffer is 64k page aligned. This is assumed since | |
340 | * this driver is designed for page compression only (for now). This | |
341 | * is very nice since we can now use direct DDE(s) for the input and | |
342 | * the alignment is guaranteed. | |
343 | */ | |
344 | inbuf = (unsigned long)in; | |
345 | if (!IS_ALIGNED(inbuf, PAGE_SIZE) || inlen != PAGE_SIZE) | |
346 | return -EINVAL; | |
347 | ||
348 | rcu_read_lock(); | |
349 | local_devdata = rcu_dereference(devdata); | |
350 | if (!local_devdata || !local_devdata->dev) { | |
351 | rcu_read_unlock(); | |
352 | return -ENODEV; | |
353 | } | |
354 | max_sync_size = local_devdata->max_sync_size; | |
355 | dev = local_devdata->dev; | |
356 | ||
357 | /* Create the header */ | |
358 | hdr = (struct nx842_header *)out; | |
359 | hdr->blocks_nr = PAGE_SIZE / max_sync_size; | |
360 | hdrsize = nx842_header_size(hdr); | |
361 | outbuf = (unsigned long)out + hdrsize; | |
362 | bytesleft = *outlen - hdrsize; | |
363 | ||
364 | /* Init scatterlist */ | |
365 | workmem = (struct nx842_workmem *)ALIGN((unsigned long)wmem, | |
366 | NX842_HW_PAGE_SIZE); | |
367 | slin.entries = (struct nx842_slentry *)workmem->slin; | |
368 | slout.entries = (struct nx842_slentry *)workmem->slout; | |
369 | ||
370 | /* Init operation */ | |
371 | op.flags = NX842_OP_COMPRESS; | |
372 | csbcpb = &workmem->csbcpb; | |
373 | memset(csbcpb, 0, sizeof(*csbcpb)); | |
33b58b01 ME |
374 | op.csbcpb = __pa(csbcpb); |
375 | op.out = __pa(slout.entries); | |
0e16aafb SJ |
376 | |
377 | for (i = 0; i < hdr->blocks_nr; i++) { | |
378 | /* | |
379 | * Aligning the output blocks to 128 bytes does waste space, | |
380 | * but it prevents the need for bounce buffers and memory | |
381 | * copies. It also simplifies the code a lot. In the worst | |
382 | * case (64k page, 4k max_sync_size), you lose up to | |
383 | * (128*16)/64k = ~3% the compression factor. For 64k | |
384 | * max_sync_size, the loss would be at most 128/64k = ~0.2%. | |
385 | */ | |
386 | padding = ALIGN(outbuf, IO_BUFFER_ALIGN) - outbuf; | |
387 | outbuf += padding; | |
388 | bytesleft -= padding; | |
389 | if (i == 0) | |
390 | /* save offset into first block in header */ | |
391 | hdr->offset = padding + hdrsize; | |
392 | ||
393 | if (bytesleft <= 0) { | |
394 | ret = -ENOSPC; | |
395 | goto unlock; | |
396 | } | |
397 | ||
398 | /* | |
399 | * NOTE: If the default max_sync_size is changed from 4k | |
400 | * to 64k, remove the "likely" case below, since a | |
401 | * scatterlist will always be needed. | |
402 | */ | |
403 | if (likely(max_sync_size == NX842_HW_PAGE_SIZE)) { | |
404 | /* Create direct DDE */ | |
33b58b01 | 405 | op.in = __pa(inbuf); |
0e16aafb SJ |
406 | op.inlen = max_sync_size; |
407 | ||
408 | } else { | |
409 | /* Create indirect DDE (scatterlist) */ | |
410 | nx842_build_scatterlist(inbuf, max_sync_size, &slin); | |
33b58b01 | 411 | op.in = __pa(slin.entries); |
0e16aafb SJ |
412 | op.inlen = -nx842_get_scatterlist_size(&slin); |
413 | } | |
414 | ||
415 | /* | |
416 | * If max_sync_size != NX842_HW_PAGE_SIZE, an indirect | |
417 | * DDE is required for the outbuf. | |
418 | * If max_sync_size == NX842_HW_PAGE_SIZE, outbuf must | |
419 | * also be page aligned (1 in 128/4k=32 chance) in order | |
420 | * to use a direct DDE. | |
421 | * This is unlikely, just use an indirect DDE always. | |
422 | */ | |
423 | nx842_build_scatterlist(outbuf, | |
424 | min(bytesleft, max_sync_size), &slout); | |
425 | /* op.out set before loop */ | |
426 | op.outlen = -nx842_get_scatterlist_size(&slout); | |
427 | ||
428 | /* Send request to pHyp */ | |
429 | ret = vio_h_cop_sync(local_devdata->vdev, &op); | |
430 | ||
431 | /* Check for pHyp error */ | |
432 | if (ret) { | |
433 | dev_dbg(dev, "%s: vio_h_cop_sync error (ret=%d, hret=%ld)\n", | |
434 | __func__, ret, op.hcall_err); | |
435 | ret = -EIO; | |
436 | goto unlock; | |
437 | } | |
438 | ||
439 | /* Check for hardware error */ | |
440 | ret = nx842_validate_result(dev, &csbcpb->csb); | |
441 | if (ret && ret != -ENOSPC) | |
442 | goto unlock; | |
443 | ||
444 | /* Handle incompressible data */ | |
445 | if (unlikely(ret == -ENOSPC)) { | |
446 | if (bytesleft < max_sync_size) { | |
447 | /* | |
448 | * Not enough space left in the output buffer | |
449 | * to store uncompressed block | |
450 | */ | |
451 | goto unlock; | |
452 | } else { | |
453 | /* Store incompressible block */ | |
454 | memcpy((void *)outbuf, (void *)inbuf, | |
455 | max_sync_size); | |
456 | hdr->sizes[i] = -max_sync_size; | |
457 | outbuf += max_sync_size; | |
458 | bytesleft -= max_sync_size; | |
459 | /* Reset ret, incompressible data handled */ | |
460 | ret = 0; | |
461 | } | |
462 | } else { | |
463 | /* Normal case, compression was successful */ | |
464 | size = csbcpb->csb.processed_byte_count; | |
465 | dev_dbg(dev, "%s: processed_bytes=%d\n", | |
466 | __func__, size); | |
467 | hdr->sizes[i] = size; | |
468 | outbuf += size; | |
469 | bytesleft -= size; | |
470 | } | |
471 | ||
472 | inbuf += max_sync_size; | |
473 | } | |
474 | ||
475 | *outlen = (unsigned int)(outbuf - (unsigned long)out); | |
476 | ||
477 | unlock: | |
478 | if (ret) | |
479 | nx842_inc_comp_failed(local_devdata); | |
480 | else { | |
481 | nx842_inc_comp_complete(local_devdata); | |
482 | ibm_nx842_incr_hist(local_devdata->counters->comp_times, | |
483 | (get_tb() - start_time) / tb_ticks_per_usec); | |
484 | } | |
485 | rcu_read_unlock(); | |
486 | return ret; | |
487 | } | |
488 | EXPORT_SYMBOL_GPL(nx842_compress); | |
489 | ||
490 | static int sw842_decompress(const unsigned char *, int, unsigned char *, int *, | |
491 | const void *); | |
492 | ||
493 | /** | |
494 | * nx842_decompress - Decompress data using the 842 algorithm | |
495 | * | |
496 | * Decompression provide by the NX842 coprocessor on IBM Power systems. | |
497 | * The input buffer is decompressed and the result is stored in the | |
498 | * provided output buffer. The size allocated to the output buffer is | |
499 | * provided by the caller of this function in @outlen. Upon return from | |
500 | * this function @outlen contains the length of the decompressed data. | |
501 | * If there is an error then @outlen will be 0 and an error will be | |
502 | * specified by the return code from this function. | |
503 | * | |
504 | * @in: Pointer to input buffer, will use bounce buffer if not 128 byte | |
505 | * aligned | |
506 | * @inlen: Length of input buffer | |
507 | * @out: Pointer to output buffer, must be page aligned | |
508 | * @outlen: Length of output buffer, must be PAGE_SIZE | |
509 | * @wrkmem: ptr to buffer for working memory, size determined by | |
510 | * nx842_get_workmem_size() | |
511 | * | |
512 | * Returns: | |
513 | * 0 Success, output of length @outlen stored in the buffer at @out | |
514 | * -ENODEV Hardware decompression device is unavailable | |
515 | * -ENOMEM Unable to allocate internal buffers | |
516 | * -ENOSPC Output buffer is to small | |
517 | * -EINVAL Bad input data encountered when attempting decompress | |
518 | * -EIO Internal error | |
519 | */ | |
520 | int nx842_decompress(const unsigned char *in, unsigned int inlen, | |
521 | unsigned char *out, unsigned int *outlen, void *wmem) | |
522 | { | |
523 | struct nx842_header *hdr; | |
524 | struct nx842_devdata *local_devdata; | |
525 | struct device *dev = NULL; | |
526 | struct nx842_workmem *workmem; | |
527 | struct nx842_scatterlist slin, slout; | |
528 | struct nx_csbcpb *csbcpb; | |
529 | int ret = 0, i, size, max_sync_size; | |
530 | unsigned long inbuf, outbuf; | |
531 | struct vio_pfo_op op = { | |
532 | .done = NULL, | |
533 | .handle = 0, | |
534 | .timeout = 0, | |
535 | }; | |
536 | unsigned long start_time = get_tb(); | |
537 | ||
538 | /* Ensure page alignment and size */ | |
539 | outbuf = (unsigned long)out; | |
540 | if (!IS_ALIGNED(outbuf, PAGE_SIZE) || *outlen != PAGE_SIZE) | |
541 | return -EINVAL; | |
542 | ||
543 | rcu_read_lock(); | |
544 | local_devdata = rcu_dereference(devdata); | |
545 | if (local_devdata) | |
546 | dev = local_devdata->dev; | |
547 | ||
548 | /* Get header */ | |
549 | hdr = (struct nx842_header *)in; | |
550 | ||
551 | workmem = (struct nx842_workmem *)ALIGN((unsigned long)wmem, | |
552 | NX842_HW_PAGE_SIZE); | |
553 | ||
554 | inbuf = (unsigned long)in + hdr->offset; | |
555 | if (likely(!IS_ALIGNED(inbuf, IO_BUFFER_ALIGN))) { | |
556 | /* Copy block(s) into bounce buffer for alignment */ | |
557 | memcpy(workmem->bounce, in + hdr->offset, inlen - hdr->offset); | |
558 | inbuf = (unsigned long)workmem->bounce; | |
559 | } | |
560 | ||
561 | /* Init scatterlist */ | |
562 | slin.entries = (struct nx842_slentry *)workmem->slin; | |
563 | slout.entries = (struct nx842_slentry *)workmem->slout; | |
564 | ||
565 | /* Init operation */ | |
566 | op.flags = NX842_OP_DECOMPRESS; | |
567 | csbcpb = &workmem->csbcpb; | |
568 | memset(csbcpb, 0, sizeof(*csbcpb)); | |
33b58b01 | 569 | op.csbcpb = __pa(csbcpb); |
0e16aafb SJ |
570 | |
571 | /* | |
572 | * max_sync_size may have changed since compression, | |
573 | * so we can't read it from the device info. We need | |
574 | * to derive it from hdr->blocks_nr. | |
575 | */ | |
576 | max_sync_size = PAGE_SIZE / hdr->blocks_nr; | |
577 | ||
578 | for (i = 0; i < hdr->blocks_nr; i++) { | |
579 | /* Skip padding */ | |
580 | inbuf = ALIGN(inbuf, IO_BUFFER_ALIGN); | |
581 | ||
582 | if (hdr->sizes[i] < 0) { | |
583 | /* Negative sizes indicate uncompressed data blocks */ | |
584 | size = abs(hdr->sizes[i]); | |
585 | memcpy((void *)outbuf, (void *)inbuf, size); | |
586 | outbuf += size; | |
587 | inbuf += size; | |
588 | continue; | |
589 | } | |
590 | ||
591 | if (!dev) | |
592 | goto sw; | |
593 | ||
594 | /* | |
595 | * The better the compression, the more likely the "likely" | |
596 | * case becomes. | |
597 | */ | |
598 | if (likely((inbuf & NX842_HW_PAGE_MASK) == | |
599 | ((inbuf + hdr->sizes[i] - 1) & NX842_HW_PAGE_MASK))) { | |
600 | /* Create direct DDE */ | |
33b58b01 | 601 | op.in = __pa(inbuf); |
0e16aafb SJ |
602 | op.inlen = hdr->sizes[i]; |
603 | } else { | |
604 | /* Create indirect DDE (scatterlist) */ | |
605 | nx842_build_scatterlist(inbuf, hdr->sizes[i] , &slin); | |
33b58b01 | 606 | op.in = __pa(slin.entries); |
0e16aafb SJ |
607 | op.inlen = -nx842_get_scatterlist_size(&slin); |
608 | } | |
609 | ||
610 | /* | |
611 | * NOTE: If the default max_sync_size is changed from 4k | |
612 | * to 64k, remove the "likely" case below, since a | |
613 | * scatterlist will always be needed. | |
614 | */ | |
615 | if (likely(max_sync_size == NX842_HW_PAGE_SIZE)) { | |
616 | /* Create direct DDE */ | |
33b58b01 | 617 | op.out = __pa(outbuf); |
0e16aafb SJ |
618 | op.outlen = max_sync_size; |
619 | } else { | |
620 | /* Create indirect DDE (scatterlist) */ | |
621 | nx842_build_scatterlist(outbuf, max_sync_size, &slout); | |
33b58b01 | 622 | op.out = __pa(slout.entries); |
0e16aafb SJ |
623 | op.outlen = -nx842_get_scatterlist_size(&slout); |
624 | } | |
625 | ||
626 | /* Send request to pHyp */ | |
627 | ret = vio_h_cop_sync(local_devdata->vdev, &op); | |
628 | ||
629 | /* Check for pHyp error */ | |
630 | if (ret) { | |
631 | dev_dbg(dev, "%s: vio_h_cop_sync error (ret=%d, hret=%ld)\n", | |
632 | __func__, ret, op.hcall_err); | |
633 | dev = NULL; | |
634 | goto sw; | |
635 | } | |
636 | ||
637 | /* Check for hardware error */ | |
638 | ret = nx842_validate_result(dev, &csbcpb->csb); | |
639 | if (ret) { | |
640 | dev = NULL; | |
641 | goto sw; | |
642 | } | |
643 | ||
644 | /* HW decompression success */ | |
645 | inbuf += hdr->sizes[i]; | |
646 | outbuf += csbcpb->csb.processed_byte_count; | |
647 | continue; | |
648 | ||
649 | sw: | |
650 | /* software decompression */ | |
651 | size = max_sync_size; | |
652 | ret = sw842_decompress( | |
653 | (unsigned char *)inbuf, hdr->sizes[i], | |
654 | (unsigned char *)outbuf, &size, wmem); | |
655 | if (ret) | |
656 | pr_debug("%s: sw842_decompress failed with %d\n", | |
657 | __func__, ret); | |
658 | ||
659 | if (ret) { | |
660 | if (ret != -ENOSPC && ret != -EINVAL && | |
661 | ret != -EMSGSIZE) | |
662 | ret = -EIO; | |
663 | goto unlock; | |
664 | } | |
665 | ||
666 | /* SW decompression success */ | |
667 | inbuf += hdr->sizes[i]; | |
668 | outbuf += size; | |
669 | } | |
670 | ||
671 | *outlen = (unsigned int)(outbuf - (unsigned long)out); | |
672 | ||
673 | unlock: | |
674 | if (ret) | |
675 | /* decompress fail */ | |
676 | nx842_inc_decomp_failed(local_devdata); | |
677 | else { | |
678 | if (!dev) | |
679 | /* software decompress */ | |
680 | nx842_inc_swdecomp(local_devdata); | |
681 | nx842_inc_decomp_complete(local_devdata); | |
682 | ibm_nx842_incr_hist(local_devdata->counters->decomp_times, | |
683 | (get_tb() - start_time) / tb_ticks_per_usec); | |
684 | } | |
685 | ||
686 | rcu_read_unlock(); | |
687 | return ret; | |
688 | } | |
689 | EXPORT_SYMBOL_GPL(nx842_decompress); | |
690 | ||
691 | /** | |
692 | * nx842_OF_set_defaults -- Set default (disabled) values for devdata | |
693 | * | |
694 | * @devdata - struct nx842_devdata to update | |
695 | * | |
696 | * Returns: | |
697 | * 0 on success | |
698 | * -ENOENT if @devdata ptr is NULL | |
699 | */ | |
700 | static int nx842_OF_set_defaults(struct nx842_devdata *devdata) | |
701 | { | |
702 | if (devdata) { | |
703 | devdata->max_sync_size = 0; | |
704 | devdata->max_sync_sg = 0; | |
705 | devdata->max_sg_len = 0; | |
706 | devdata->status = UNAVAILABLE; | |
707 | return 0; | |
708 | } else | |
709 | return -ENOENT; | |
710 | } | |
711 | ||
712 | /** | |
713 | * nx842_OF_upd_status -- Update the device info from OF status prop | |
714 | * | |
715 | * The status property indicates if the accelerator is enabled. If the | |
716 | * device is in the OF tree it indicates that the hardware is present. | |
717 | * The status field indicates if the device is enabled when the status | |
718 | * is 'okay'. Otherwise the device driver will be disabled. | |
719 | * | |
720 | * @devdata - struct nx842_devdata to update | |
721 | * @prop - struct property point containing the maxsyncop for the update | |
722 | * | |
723 | * Returns: | |
724 | * 0 - Device is available | |
725 | * -EINVAL - Device is not available | |
726 | */ | |
727 | static int nx842_OF_upd_status(struct nx842_devdata *devdata, | |
728 | struct property *prop) { | |
729 | int ret = 0; | |
730 | const char *status = (const char *)prop->value; | |
731 | ||
732 | if (!strncmp(status, "okay", (size_t)prop->length)) { | |
733 | devdata->status = AVAILABLE; | |
734 | } else { | |
735 | dev_info(devdata->dev, "%s: status '%s' is not 'okay'\n", | |
736 | __func__, status); | |
737 | devdata->status = UNAVAILABLE; | |
738 | } | |
739 | ||
740 | return ret; | |
741 | } | |
742 | ||
743 | /** | |
744 | * nx842_OF_upd_maxsglen -- Update the device info from OF maxsglen prop | |
745 | * | |
746 | * Definition of the 'ibm,max-sg-len' OF property: | |
747 | * This field indicates the maximum byte length of a scatter list | |
748 | * for the platform facility. It is a single cell encoded as with encode-int. | |
749 | * | |
750 | * Example: | |
751 | * # od -x ibm,max-sg-len | |
752 | * 0000000 0000 0ff0 | |
753 | * | |
754 | * In this example, the maximum byte length of a scatter list is | |
755 | * 0x0ff0 (4,080). | |
756 | * | |
757 | * @devdata - struct nx842_devdata to update | |
758 | * @prop - struct property point containing the maxsyncop for the update | |
759 | * | |
760 | * Returns: | |
761 | * 0 on success | |
762 | * -EINVAL on failure | |
763 | */ | |
764 | static int nx842_OF_upd_maxsglen(struct nx842_devdata *devdata, | |
765 | struct property *prop) { | |
766 | int ret = 0; | |
767 | const int *maxsglen = prop->value; | |
768 | ||
769 | if (prop->length != sizeof(*maxsglen)) { | |
770 | dev_err(devdata->dev, "%s: unexpected format for ibm,max-sg-len property\n", __func__); | |
771 | dev_dbg(devdata->dev, "%s: ibm,max-sg-len is %d bytes long, expected %lu bytes\n", __func__, | |
772 | prop->length, sizeof(*maxsglen)); | |
773 | ret = -EINVAL; | |
774 | } else { | |
775 | devdata->max_sg_len = (unsigned int)min(*maxsglen, | |
776 | (int)NX842_HW_PAGE_SIZE); | |
777 | } | |
778 | ||
779 | return ret; | |
780 | } | |
781 | ||
782 | /** | |
783 | * nx842_OF_upd_maxsyncop -- Update the device info from OF maxsyncop prop | |
784 | * | |
785 | * Definition of the 'ibm,max-sync-cop' OF property: | |
786 | * Two series of cells. The first series of cells represents the maximums | |
787 | * that can be synchronously compressed. The second series of cells | |
788 | * represents the maximums that can be synchronously decompressed. | |
789 | * 1. The first cell in each series contains the count of the number of | |
790 | * data length, scatter list elements pairs that follow – each being | |
791 | * of the form | |
792 | * a. One cell data byte length | |
793 | * b. One cell total number of scatter list elements | |
794 | * | |
795 | * Example: | |
796 | * # od -x ibm,max-sync-cop | |
797 | * 0000000 0000 0001 0000 1000 0000 01fe 0000 0001 | |
798 | * 0000020 0000 1000 0000 01fe | |
799 | * | |
800 | * In this example, compression supports 0x1000 (4,096) data byte length | |
801 | * and 0x1fe (510) total scatter list elements. Decompression supports | |
802 | * 0x1000 (4,096) data byte length and 0x1f3 (510) total scatter list | |
803 | * elements. | |
804 | * | |
805 | * @devdata - struct nx842_devdata to update | |
806 | * @prop - struct property point containing the maxsyncop for the update | |
807 | * | |
808 | * Returns: | |
809 | * 0 on success | |
810 | * -EINVAL on failure | |
811 | */ | |
812 | static int nx842_OF_upd_maxsyncop(struct nx842_devdata *devdata, | |
813 | struct property *prop) { | |
814 | int ret = 0; | |
815 | const struct maxsynccop_t { | |
816 | int comp_elements; | |
817 | int comp_data_limit; | |
818 | int comp_sg_limit; | |
819 | int decomp_elements; | |
820 | int decomp_data_limit; | |
821 | int decomp_sg_limit; | |
822 | } *maxsynccop; | |
823 | ||
824 | if (prop->length != sizeof(*maxsynccop)) { | |
825 | dev_err(devdata->dev, "%s: unexpected format for ibm,max-sync-cop property\n", __func__); | |
826 | dev_dbg(devdata->dev, "%s: ibm,max-sync-cop is %d bytes long, expected %lu bytes\n", __func__, prop->length, | |
827 | sizeof(*maxsynccop)); | |
828 | ret = -EINVAL; | |
829 | goto out; | |
830 | } | |
831 | ||
832 | maxsynccop = (const struct maxsynccop_t *)prop->value; | |
833 | ||
834 | /* Use one limit rather than separate limits for compression and | |
835 | * decompression. Set a maximum for this so as not to exceed the | |
836 | * size that the header can support and round the value down to | |
837 | * the hardware page size (4K) */ | |
838 | devdata->max_sync_size = | |
839 | (unsigned int)min(maxsynccop->comp_data_limit, | |
840 | maxsynccop->decomp_data_limit); | |
841 | ||
842 | devdata->max_sync_size = min_t(unsigned int, devdata->max_sync_size, | |
843 | SIZE_64K); | |
844 | ||
845 | if (devdata->max_sync_size < SIZE_4K) { | |
846 | dev_err(devdata->dev, "%s: hardware max data size (%u) is " | |
847 | "less than the driver minimum, unable to use " | |
848 | "the hardware device\n", | |
849 | __func__, devdata->max_sync_size); | |
850 | ret = -EINVAL; | |
851 | goto out; | |
852 | } | |
853 | ||
854 | devdata->max_sync_sg = (unsigned int)min(maxsynccop->comp_sg_limit, | |
855 | maxsynccop->decomp_sg_limit); | |
856 | if (devdata->max_sync_sg < 1) { | |
857 | dev_err(devdata->dev, "%s: hardware max sg size (%u) is " | |
858 | "less than the driver minimum, unable to use " | |
859 | "the hardware device\n", | |
860 | __func__, devdata->max_sync_sg); | |
861 | ret = -EINVAL; | |
862 | goto out; | |
863 | } | |
864 | ||
865 | out: | |
866 | return ret; | |
867 | } | |
868 | ||
869 | /** | |
870 | * | |
871 | * nx842_OF_upd -- Handle OF properties updates for the device. | |
872 | * | |
873 | * Set all properties from the OF tree. Optionally, a new property | |
874 | * can be provided by the @new_prop pointer to overwrite an existing value. | |
875 | * The device will remain disabled until all values are valid, this function | |
876 | * will return an error for updates unless all values are valid. | |
877 | * | |
878 | * @new_prop: If not NULL, this property is being updated. If NULL, update | |
879 | * all properties from the current values in the OF tree. | |
880 | * | |
881 | * Returns: | |
882 | * 0 - Success | |
883 | * -ENOMEM - Could not allocate memory for new devdata structure | |
884 | * -EINVAL - property value not found, new_prop is not a recognized | |
885 | * property for the device or property value is not valid. | |
886 | * -ENODEV - Device is not available | |
887 | */ | |
888 | static int nx842_OF_upd(struct property *new_prop) | |
889 | { | |
890 | struct nx842_devdata *old_devdata = NULL; | |
891 | struct nx842_devdata *new_devdata = NULL; | |
892 | struct device_node *of_node = NULL; | |
893 | struct property *status = NULL; | |
894 | struct property *maxsglen = NULL; | |
895 | struct property *maxsyncop = NULL; | |
896 | int ret = 0; | |
897 | unsigned long flags; | |
898 | ||
899 | spin_lock_irqsave(&devdata_mutex, flags); | |
900 | old_devdata = rcu_dereference_check(devdata, | |
901 | lockdep_is_held(&devdata_mutex)); | |
902 | if (old_devdata) | |
903 | of_node = old_devdata->dev->of_node; | |
904 | ||
905 | if (!old_devdata || !of_node) { | |
906 | pr_err("%s: device is not available\n", __func__); | |
907 | spin_unlock_irqrestore(&devdata_mutex, flags); | |
908 | return -ENODEV; | |
909 | } | |
910 | ||
911 | new_devdata = kzalloc(sizeof(*new_devdata), GFP_NOFS); | |
912 | if (!new_devdata) { | |
913 | dev_err(old_devdata->dev, "%s: Could not allocate memory for device data\n", __func__); | |
914 | ret = -ENOMEM; | |
915 | goto error_out; | |
916 | } | |
917 | ||
918 | memcpy(new_devdata, old_devdata, sizeof(*old_devdata)); | |
919 | new_devdata->counters = old_devdata->counters; | |
920 | ||
921 | /* Set ptrs for existing properties */ | |
922 | status = of_find_property(of_node, "status", NULL); | |
923 | maxsglen = of_find_property(of_node, "ibm,max-sg-len", NULL); | |
924 | maxsyncop = of_find_property(of_node, "ibm,max-sync-cop", NULL); | |
925 | if (!status || !maxsglen || !maxsyncop) { | |
926 | dev_err(old_devdata->dev, "%s: Could not locate device properties\n", __func__); | |
927 | ret = -EINVAL; | |
928 | goto error_out; | |
929 | } | |
930 | ||
931 | /* Set ptr to new property if provided */ | |
932 | if (new_prop) { | |
933 | /* Single property */ | |
934 | if (!strncmp(new_prop->name, "status", new_prop->length)) { | |
935 | status = new_prop; | |
936 | ||
937 | } else if (!strncmp(new_prop->name, "ibm,max-sg-len", | |
938 | new_prop->length)) { | |
939 | maxsglen = new_prop; | |
940 | ||
941 | } else if (!strncmp(new_prop->name, "ibm,max-sync-cop", | |
942 | new_prop->length)) { | |
943 | maxsyncop = new_prop; | |
944 | ||
945 | } else { | |
946 | /* | |
947 | * Skip the update, the property being updated | |
948 | * has no impact. | |
949 | */ | |
950 | goto out; | |
951 | } | |
952 | } | |
953 | ||
954 | /* Perform property updates */ | |
955 | ret = nx842_OF_upd_status(new_devdata, status); | |
956 | if (ret) | |
957 | goto error_out; | |
958 | ||
959 | ret = nx842_OF_upd_maxsglen(new_devdata, maxsglen); | |
960 | if (ret) | |
961 | goto error_out; | |
962 | ||
963 | ret = nx842_OF_upd_maxsyncop(new_devdata, maxsyncop); | |
964 | if (ret) | |
965 | goto error_out; | |
966 | ||
967 | out: | |
968 | dev_info(old_devdata->dev, "%s: max_sync_size new:%u old:%u\n", | |
969 | __func__, new_devdata->max_sync_size, | |
970 | old_devdata->max_sync_size); | |
971 | dev_info(old_devdata->dev, "%s: max_sync_sg new:%u old:%u\n", | |
972 | __func__, new_devdata->max_sync_sg, | |
973 | old_devdata->max_sync_sg); | |
974 | dev_info(old_devdata->dev, "%s: max_sg_len new:%u old:%u\n", | |
975 | __func__, new_devdata->max_sg_len, | |
976 | old_devdata->max_sg_len); | |
977 | ||
978 | rcu_assign_pointer(devdata, new_devdata); | |
979 | spin_unlock_irqrestore(&devdata_mutex, flags); | |
980 | synchronize_rcu(); | |
981 | dev_set_drvdata(new_devdata->dev, new_devdata); | |
982 | kfree(old_devdata); | |
983 | return 0; | |
984 | ||
985 | error_out: | |
986 | if (new_devdata) { | |
987 | dev_info(old_devdata->dev, "%s: device disabled\n", __func__); | |
988 | nx842_OF_set_defaults(new_devdata); | |
989 | rcu_assign_pointer(devdata, new_devdata); | |
990 | spin_unlock_irqrestore(&devdata_mutex, flags); | |
991 | synchronize_rcu(); | |
992 | dev_set_drvdata(new_devdata->dev, new_devdata); | |
993 | kfree(old_devdata); | |
994 | } else { | |
995 | dev_err(old_devdata->dev, "%s: could not update driver from hardware\n", __func__); | |
996 | spin_unlock_irqrestore(&devdata_mutex, flags); | |
997 | } | |
998 | ||
999 | if (!ret) | |
1000 | ret = -EINVAL; | |
1001 | return ret; | |
1002 | } | |
1003 | ||
1004 | /** | |
1005 | * nx842_OF_notifier - Process updates to OF properties for the device | |
1006 | * | |
1007 | * @np: notifier block | |
1008 | * @action: notifier action | |
1009 | * @update: struct pSeries_reconfig_prop_update pointer if action is | |
1010 | * PSERIES_UPDATE_PROPERTY | |
1011 | * | |
1012 | * Returns: | |
1013 | * NOTIFY_OK on success | |
1014 | * NOTIFY_BAD encoded with error number on failure, use | |
1015 | * notifier_to_errno() to decode this value | |
1016 | */ | |
1017 | static int nx842_OF_notifier(struct notifier_block *np, | |
1018 | unsigned long action, | |
1019 | void *update) | |
1020 | { | |
1021 | struct pSeries_reconfig_prop_update *upd; | |
1022 | struct nx842_devdata *local_devdata; | |
1023 | struct device_node *node = NULL; | |
1024 | ||
1025 | upd = (struct pSeries_reconfig_prop_update *)update; | |
1026 | ||
1027 | rcu_read_lock(); | |
1028 | local_devdata = rcu_dereference(devdata); | |
1029 | if (local_devdata) | |
1030 | node = local_devdata->dev->of_node; | |
1031 | ||
1032 | if (local_devdata && | |
1033 | action == PSERIES_UPDATE_PROPERTY && | |
1034 | !strcmp(upd->node->name, node->name)) { | |
1035 | rcu_read_unlock(); | |
1036 | nx842_OF_upd(upd->property); | |
1037 | } else | |
1038 | rcu_read_unlock(); | |
1039 | ||
1040 | return NOTIFY_OK; | |
1041 | } | |
1042 | ||
1043 | static struct notifier_block nx842_of_nb = { | |
1044 | .notifier_call = nx842_OF_notifier, | |
1045 | }; | |
1046 | ||
1047 | #define nx842_counter_read(_name) \ | |
1048 | static ssize_t nx842_##_name##_show(struct device *dev, \ | |
1049 | struct device_attribute *attr, \ | |
1050 | char *buf) { \ | |
1051 | struct nx842_devdata *local_devdata; \ | |
1052 | int p = 0; \ | |
1053 | rcu_read_lock(); \ | |
1054 | local_devdata = rcu_dereference(devdata); \ | |
1055 | if (local_devdata) \ | |
1056 | p = snprintf(buf, PAGE_SIZE, "%ld\n", \ | |
1057 | atomic64_read(&local_devdata->counters->_name)); \ | |
1058 | rcu_read_unlock(); \ | |
1059 | return p; \ | |
1060 | } | |
1061 | ||
1062 | #define NX842DEV_COUNTER_ATTR_RO(_name) \ | |
1063 | nx842_counter_read(_name); \ | |
1064 | static struct device_attribute dev_attr_##_name = __ATTR(_name, \ | |
1065 | 0444, \ | |
1066 | nx842_##_name##_show,\ | |
1067 | NULL); | |
1068 | ||
1069 | NX842DEV_COUNTER_ATTR_RO(comp_complete); | |
1070 | NX842DEV_COUNTER_ATTR_RO(comp_failed); | |
1071 | NX842DEV_COUNTER_ATTR_RO(decomp_complete); | |
1072 | NX842DEV_COUNTER_ATTR_RO(decomp_failed); | |
1073 | NX842DEV_COUNTER_ATTR_RO(swdecomp); | |
1074 | ||
1075 | static ssize_t nx842_timehist_show(struct device *, | |
1076 | struct device_attribute *, char *); | |
1077 | ||
1078 | static struct device_attribute dev_attr_comp_times = __ATTR(comp_times, 0444, | |
1079 | nx842_timehist_show, NULL); | |
1080 | static struct device_attribute dev_attr_decomp_times = __ATTR(decomp_times, | |
1081 | 0444, nx842_timehist_show, NULL); | |
1082 | ||
1083 | static ssize_t nx842_timehist_show(struct device *dev, | |
1084 | struct device_attribute *attr, char *buf) { | |
1085 | char *p = buf; | |
1086 | struct nx842_devdata *local_devdata; | |
1087 | atomic64_t *times; | |
1088 | int bytes_remain = PAGE_SIZE; | |
1089 | int bytes; | |
1090 | int i; | |
1091 | ||
1092 | rcu_read_lock(); | |
1093 | local_devdata = rcu_dereference(devdata); | |
1094 | if (!local_devdata) { | |
1095 | rcu_read_unlock(); | |
1096 | return 0; | |
1097 | } | |
1098 | ||
1099 | if (attr == &dev_attr_comp_times) | |
1100 | times = local_devdata->counters->comp_times; | |
1101 | else if (attr == &dev_attr_decomp_times) | |
1102 | times = local_devdata->counters->decomp_times; | |
1103 | else { | |
1104 | rcu_read_unlock(); | |
1105 | return 0; | |
1106 | } | |
1107 | ||
1108 | for (i = 0; i < (NX842_HIST_SLOTS - 2); i++) { | |
1109 | bytes = snprintf(p, bytes_remain, "%u-%uus:\t%ld\n", | |
1110 | i ? (2<<(i-1)) : 0, (2<<i)-1, | |
1111 | atomic64_read(×[i])); | |
1112 | bytes_remain -= bytes; | |
1113 | p += bytes; | |
1114 | } | |
1115 | /* The last bucket holds everything over | |
1116 | * 2<<(NX842_HIST_SLOTS - 2) us */ | |
1117 | bytes = snprintf(p, bytes_remain, "%uus - :\t%ld\n", | |
1118 | 2<<(NX842_HIST_SLOTS - 2), | |
1119 | atomic64_read(×[(NX842_HIST_SLOTS - 1)])); | |
1120 | p += bytes; | |
1121 | ||
1122 | rcu_read_unlock(); | |
1123 | return p - buf; | |
1124 | } | |
1125 | ||
1126 | static struct attribute *nx842_sysfs_entries[] = { | |
1127 | &dev_attr_comp_complete.attr, | |
1128 | &dev_attr_comp_failed.attr, | |
1129 | &dev_attr_decomp_complete.attr, | |
1130 | &dev_attr_decomp_failed.attr, | |
1131 | &dev_attr_swdecomp.attr, | |
1132 | &dev_attr_comp_times.attr, | |
1133 | &dev_attr_decomp_times.attr, | |
1134 | NULL, | |
1135 | }; | |
1136 | ||
1137 | static struct attribute_group nx842_attribute_group = { | |
1138 | .name = NULL, /* put in device directory */ | |
1139 | .attrs = nx842_sysfs_entries, | |
1140 | }; | |
1141 | ||
1142 | static int __init nx842_probe(struct vio_dev *viodev, | |
1143 | const struct vio_device_id *id) | |
1144 | { | |
1145 | struct nx842_devdata *old_devdata, *new_devdata = NULL; | |
1146 | unsigned long flags; | |
1147 | int ret = 0; | |
1148 | ||
1149 | spin_lock_irqsave(&devdata_mutex, flags); | |
1150 | old_devdata = rcu_dereference_check(devdata, | |
1151 | lockdep_is_held(&devdata_mutex)); | |
1152 | ||
1153 | if (old_devdata && old_devdata->vdev != NULL) { | |
1154 | dev_err(&viodev->dev, "%s: Attempt to register more than one instance of the hardware\n", __func__); | |
1155 | ret = -1; | |
1156 | goto error_unlock; | |
1157 | } | |
1158 | ||
1159 | dev_set_drvdata(&viodev->dev, NULL); | |
1160 | ||
1161 | new_devdata = kzalloc(sizeof(*new_devdata), GFP_NOFS); | |
1162 | if (!new_devdata) { | |
1163 | dev_err(&viodev->dev, "%s: Could not allocate memory for device data\n", __func__); | |
1164 | ret = -ENOMEM; | |
1165 | goto error_unlock; | |
1166 | } | |
1167 | ||
1168 | new_devdata->counters = kzalloc(sizeof(*new_devdata->counters), | |
1169 | GFP_NOFS); | |
1170 | if (!new_devdata->counters) { | |
1171 | dev_err(&viodev->dev, "%s: Could not allocate memory for performance counters\n", __func__); | |
1172 | ret = -ENOMEM; | |
1173 | goto error_unlock; | |
1174 | } | |
1175 | ||
1176 | new_devdata->vdev = viodev; | |
1177 | new_devdata->dev = &viodev->dev; | |
1178 | nx842_OF_set_defaults(new_devdata); | |
1179 | ||
1180 | rcu_assign_pointer(devdata, new_devdata); | |
1181 | spin_unlock_irqrestore(&devdata_mutex, flags); | |
1182 | synchronize_rcu(); | |
1183 | kfree(old_devdata); | |
1184 | ||
1185 | pSeries_reconfig_notifier_register(&nx842_of_nb); | |
1186 | ||
1187 | ret = nx842_OF_upd(NULL); | |
1188 | if (ret && ret != -ENODEV) { | |
1189 | dev_err(&viodev->dev, "could not parse device tree. %d\n", ret); | |
1190 | ret = -1; | |
1191 | goto error; | |
1192 | } | |
1193 | ||
1194 | rcu_read_lock(); | |
1195 | if (dev_set_drvdata(&viodev->dev, rcu_dereference(devdata))) { | |
1196 | rcu_read_unlock(); | |
1197 | dev_err(&viodev->dev, "failed to set driver data for device\n"); | |
1198 | ret = -1; | |
1199 | goto error; | |
1200 | } | |
1201 | rcu_read_unlock(); | |
1202 | ||
1203 | if (sysfs_create_group(&viodev->dev.kobj, &nx842_attribute_group)) { | |
1204 | dev_err(&viodev->dev, "could not create sysfs device attributes\n"); | |
1205 | ret = -1; | |
1206 | goto error; | |
1207 | } | |
1208 | ||
1209 | return 0; | |
1210 | ||
1211 | error_unlock: | |
1212 | spin_unlock_irqrestore(&devdata_mutex, flags); | |
1213 | if (new_devdata) | |
1214 | kfree(new_devdata->counters); | |
1215 | kfree(new_devdata); | |
1216 | error: | |
1217 | return ret; | |
1218 | } | |
1219 | ||
1220 | static int __exit nx842_remove(struct vio_dev *viodev) | |
1221 | { | |
1222 | struct nx842_devdata *old_devdata; | |
1223 | unsigned long flags; | |
1224 | ||
1225 | pr_info("Removing IBM Power 842 compression device\n"); | |
1226 | sysfs_remove_group(&viodev->dev.kobj, &nx842_attribute_group); | |
1227 | ||
1228 | spin_lock_irqsave(&devdata_mutex, flags); | |
1229 | old_devdata = rcu_dereference_check(devdata, | |
1230 | lockdep_is_held(&devdata_mutex)); | |
1231 | pSeries_reconfig_notifier_unregister(&nx842_of_nb); | |
1232 | rcu_assign_pointer(devdata, NULL); | |
1233 | spin_unlock_irqrestore(&devdata_mutex, flags); | |
1234 | synchronize_rcu(); | |
1235 | dev_set_drvdata(&viodev->dev, NULL); | |
1236 | if (old_devdata) | |
1237 | kfree(old_devdata->counters); | |
1238 | kfree(old_devdata); | |
1239 | return 0; | |
1240 | } | |
1241 | ||
1242 | static struct vio_device_id nx842_driver_ids[] = { | |
1243 | {"ibm,compression-v1", "ibm,compression"}, | |
1244 | {"", ""}, | |
1245 | }; | |
1246 | ||
1247 | static struct vio_driver nx842_driver = { | |
1248 | .name = MODULE_NAME, | |
1249 | .probe = nx842_probe, | |
1250 | .remove = nx842_remove, | |
1251 | .get_desired_dma = nx842_get_desired_dma, | |
1252 | .id_table = nx842_driver_ids, | |
1253 | }; | |
1254 | ||
1255 | static int __init nx842_init(void) | |
1256 | { | |
1257 | struct nx842_devdata *new_devdata; | |
1258 | pr_info("Registering IBM Power 842 compression driver\n"); | |
1259 | ||
1260 | RCU_INIT_POINTER(devdata, NULL); | |
1261 | new_devdata = kzalloc(sizeof(*new_devdata), GFP_KERNEL); | |
1262 | if (!new_devdata) { | |
1263 | pr_err("Could not allocate memory for device data\n"); | |
1264 | return -ENOMEM; | |
1265 | } | |
1266 | new_devdata->status = UNAVAILABLE; | |
1267 | RCU_INIT_POINTER(devdata, new_devdata); | |
1268 | ||
1269 | return vio_register_driver(&nx842_driver); | |
1270 | } | |
1271 | ||
1272 | module_init(nx842_init); | |
1273 | ||
1274 | static void __exit nx842_exit(void) | |
1275 | { | |
1276 | struct nx842_devdata *old_devdata; | |
1277 | unsigned long flags; | |
1278 | ||
1279 | pr_info("Exiting IBM Power 842 compression driver\n"); | |
1280 | spin_lock_irqsave(&devdata_mutex, flags); | |
1281 | old_devdata = rcu_dereference_check(devdata, | |
1282 | lockdep_is_held(&devdata_mutex)); | |
1283 | rcu_assign_pointer(devdata, NULL); | |
1284 | spin_unlock_irqrestore(&devdata_mutex, flags); | |
1285 | synchronize_rcu(); | |
1286 | if (old_devdata) | |
1287 | dev_set_drvdata(old_devdata->dev, NULL); | |
1288 | kfree(old_devdata); | |
1289 | vio_unregister_driver(&nx842_driver); | |
1290 | } | |
1291 | ||
1292 | module_exit(nx842_exit); | |
1293 | ||
1294 | /********************************* | |
1295 | * 842 software decompressor | |
1296 | *********************************/ | |
1297 | typedef int (*sw842_template_op)(const char **, int *, unsigned char **, | |
1298 | struct sw842_fifo *); | |
1299 | ||
1300 | static int sw842_data8(const char **, int *, unsigned char **, | |
1301 | struct sw842_fifo *); | |
1302 | static int sw842_data4(const char **, int *, unsigned char **, | |
1303 | struct sw842_fifo *); | |
1304 | static int sw842_data2(const char **, int *, unsigned char **, | |
1305 | struct sw842_fifo *); | |
1306 | static int sw842_ptr8(const char **, int *, unsigned char **, | |
1307 | struct sw842_fifo *); | |
1308 | static int sw842_ptr4(const char **, int *, unsigned char **, | |
1309 | struct sw842_fifo *); | |
1310 | static int sw842_ptr2(const char **, int *, unsigned char **, | |
1311 | struct sw842_fifo *); | |
1312 | ||
1313 | /* special templates */ | |
1314 | #define SW842_TMPL_REPEAT 0x1B | |
1315 | #define SW842_TMPL_ZEROS 0x1C | |
1316 | #define SW842_TMPL_EOF 0x1E | |
1317 | ||
1318 | static sw842_template_op sw842_tmpl_ops[26][4] = { | |
1319 | { sw842_data8, NULL}, /* 0 (00000) */ | |
1320 | { sw842_data4, sw842_data2, sw842_ptr2, NULL}, | |
1321 | { sw842_data4, sw842_ptr2, sw842_data2, NULL}, | |
1322 | { sw842_data4, sw842_ptr2, sw842_ptr2, NULL}, | |
1323 | { sw842_data4, sw842_ptr4, NULL}, | |
1324 | { sw842_data2, sw842_ptr2, sw842_data4, NULL}, | |
1325 | { sw842_data2, sw842_ptr2, sw842_data2, sw842_ptr2}, | |
1326 | { sw842_data2, sw842_ptr2, sw842_ptr2, sw842_data2}, | |
1327 | { sw842_data2, sw842_ptr2, sw842_ptr2, sw842_ptr2,}, | |
1328 | { sw842_data2, sw842_ptr2, sw842_ptr4, NULL}, | |
1329 | { sw842_ptr2, sw842_data2, sw842_data4, NULL}, /* 10 (01010) */ | |
1330 | { sw842_ptr2, sw842_data4, sw842_ptr2, NULL}, | |
1331 | { sw842_ptr2, sw842_data2, sw842_ptr2, sw842_data2}, | |
1332 | { sw842_ptr2, sw842_data2, sw842_ptr2, sw842_ptr2}, | |
1333 | { sw842_ptr2, sw842_data2, sw842_ptr4, NULL}, | |
1334 | { sw842_ptr2, sw842_ptr2, sw842_data4, NULL}, | |
1335 | { sw842_ptr2, sw842_ptr2, sw842_data2, sw842_ptr2}, | |
1336 | { sw842_ptr2, sw842_ptr2, sw842_ptr2, sw842_data2}, | |
1337 | { sw842_ptr2, sw842_ptr2, sw842_ptr2, sw842_ptr2}, | |
1338 | { sw842_ptr2, sw842_ptr2, sw842_ptr4, NULL}, | |
1339 | { sw842_ptr4, sw842_data4, NULL}, /* 20 (10100) */ | |
1340 | { sw842_ptr4, sw842_data2, sw842_ptr2, NULL}, | |
1341 | { sw842_ptr4, sw842_ptr2, sw842_data2, NULL}, | |
1342 | { sw842_ptr4, sw842_ptr2, sw842_ptr2, NULL}, | |
1343 | { sw842_ptr4, sw842_ptr4, NULL}, | |
1344 | { sw842_ptr8, NULL} | |
1345 | }; | |
1346 | ||
1347 | /* Software decompress helpers */ | |
1348 | ||
1349 | static uint8_t sw842_get_byte(const char *buf, int bit) | |
1350 | { | |
1351 | uint8_t tmpl; | |
1352 | uint16_t tmp; | |
1353 | tmp = htons(*(uint16_t *)(buf)); | |
1354 | tmp = (uint16_t)(tmp << bit); | |
1355 | tmp = ntohs(tmp); | |
1356 | memcpy(&tmpl, &tmp, 1); | |
1357 | return tmpl; | |
1358 | } | |
1359 | ||
1360 | static uint8_t sw842_get_template(const char **buf, int *bit) | |
1361 | { | |
1362 | uint8_t byte; | |
1363 | byte = sw842_get_byte(*buf, *bit); | |
1364 | byte = byte >> 3; | |
1365 | byte &= 0x1F; | |
1366 | *buf += (*bit + 5) / 8; | |
1367 | *bit = (*bit + 5) % 8; | |
1368 | return byte; | |
1369 | } | |
1370 | ||
1371 | /* repeat_count happens to be 5-bit too (like the template) */ | |
1372 | static uint8_t sw842_get_repeat_count(const char **buf, int *bit) | |
1373 | { | |
1374 | uint8_t byte; | |
1375 | byte = sw842_get_byte(*buf, *bit); | |
1376 | byte = byte >> 2; | |
1377 | byte &= 0x3F; | |
1378 | *buf += (*bit + 6) / 8; | |
1379 | *bit = (*bit + 6) % 8; | |
1380 | return byte; | |
1381 | } | |
1382 | ||
1383 | static uint8_t sw842_get_ptr2(const char **buf, int *bit) | |
1384 | { | |
1385 | uint8_t ptr; | |
1386 | ptr = sw842_get_byte(*buf, *bit); | |
1387 | (*buf)++; | |
1388 | return ptr; | |
1389 | } | |
1390 | ||
1391 | static uint16_t sw842_get_ptr4(const char **buf, int *bit, | |
1392 | struct sw842_fifo *fifo) | |
1393 | { | |
1394 | uint16_t ptr; | |
1395 | ptr = htons(*(uint16_t *)(*buf)); | |
1396 | ptr = (uint16_t)(ptr << *bit); | |
1397 | ptr = ptr >> 7; | |
1398 | ptr &= 0x01FF; | |
1399 | *buf += (*bit + 9) / 8; | |
1400 | *bit = (*bit + 9) % 8; | |
1401 | return ptr; | |
1402 | } | |
1403 | ||
1404 | static uint8_t sw842_get_ptr8(const char **buf, int *bit, | |
1405 | struct sw842_fifo *fifo) | |
1406 | { | |
1407 | return sw842_get_ptr2(buf, bit); | |
1408 | } | |
1409 | ||
1410 | /* Software decompress template ops */ | |
1411 | ||
1412 | static int sw842_data8(const char **inbuf, int *inbit, | |
1413 | unsigned char **outbuf, struct sw842_fifo *fifo) | |
1414 | { | |
1415 | int ret; | |
1416 | ||
1417 | ret = sw842_data4(inbuf, inbit, outbuf, fifo); | |
1418 | if (ret) | |
1419 | return ret; | |
1420 | ret = sw842_data4(inbuf, inbit, outbuf, fifo); | |
1421 | return ret; | |
1422 | } | |
1423 | ||
1424 | static int sw842_data4(const char **inbuf, int *inbit, | |
1425 | unsigned char **outbuf, struct sw842_fifo *fifo) | |
1426 | { | |
1427 | int ret; | |
1428 | ||
1429 | ret = sw842_data2(inbuf, inbit, outbuf, fifo); | |
1430 | if (ret) | |
1431 | return ret; | |
1432 | ret = sw842_data2(inbuf, inbit, outbuf, fifo); | |
1433 | return ret; | |
1434 | } | |
1435 | ||
1436 | static int sw842_data2(const char **inbuf, int *inbit, | |
1437 | unsigned char **outbuf, struct sw842_fifo *fifo) | |
1438 | { | |
1439 | **outbuf = sw842_get_byte(*inbuf, *inbit); | |
1440 | (*inbuf)++; | |
1441 | (*outbuf)++; | |
1442 | **outbuf = sw842_get_byte(*inbuf, *inbit); | |
1443 | (*inbuf)++; | |
1444 | (*outbuf)++; | |
1445 | return 0; | |
1446 | } | |
1447 | ||
1448 | static int sw842_ptr8(const char **inbuf, int *inbit, | |
1449 | unsigned char **outbuf, struct sw842_fifo *fifo) | |
1450 | { | |
1451 | uint8_t ptr; | |
1452 | ptr = sw842_get_ptr8(inbuf, inbit, fifo); | |
1453 | if (!fifo->f84_full && (ptr >= fifo->f8_count)) | |
1454 | return 1; | |
1455 | memcpy(*outbuf, fifo->f8[ptr], 8); | |
1456 | *outbuf += 8; | |
1457 | return 0; | |
1458 | } | |
1459 | ||
1460 | static int sw842_ptr4(const char **inbuf, int *inbit, | |
1461 | unsigned char **outbuf, struct sw842_fifo *fifo) | |
1462 | { | |
1463 | uint16_t ptr; | |
1464 | ptr = sw842_get_ptr4(inbuf, inbit, fifo); | |
1465 | if (!fifo->f84_full && (ptr >= fifo->f4_count)) | |
1466 | return 1; | |
1467 | memcpy(*outbuf, fifo->f4[ptr], 4); | |
1468 | *outbuf += 4; | |
1469 | return 0; | |
1470 | } | |
1471 | ||
1472 | static int sw842_ptr2(const char **inbuf, int *inbit, | |
1473 | unsigned char **outbuf, struct sw842_fifo *fifo) | |
1474 | { | |
1475 | uint8_t ptr; | |
1476 | ptr = sw842_get_ptr2(inbuf, inbit); | |
1477 | if (!fifo->f2_full && (ptr >= fifo->f2_count)) | |
1478 | return 1; | |
1479 | memcpy(*outbuf, fifo->f2[ptr], 2); | |
1480 | *outbuf += 2; | |
1481 | return 0; | |
1482 | } | |
1483 | ||
1484 | static void sw842_copy_to_fifo(const char *buf, struct sw842_fifo *fifo) | |
1485 | { | |
1486 | unsigned char initial_f2count = fifo->f2_count; | |
1487 | ||
1488 | memcpy(fifo->f8[fifo->f8_count], buf, 8); | |
1489 | fifo->f4_count += 2; | |
1490 | fifo->f8_count += 1; | |
1491 | ||
1492 | if (!fifo->f84_full && fifo->f4_count >= 512) { | |
1493 | fifo->f84_full = 1; | |
1494 | fifo->f4_count /= 512; | |
1495 | } | |
1496 | ||
1497 | memcpy(fifo->f2[fifo->f2_count++], buf, 2); | |
1498 | memcpy(fifo->f2[fifo->f2_count++], buf + 2, 2); | |
1499 | memcpy(fifo->f2[fifo->f2_count++], buf + 4, 2); | |
1500 | memcpy(fifo->f2[fifo->f2_count++], buf + 6, 2); | |
1501 | if (fifo->f2_count < initial_f2count) | |
1502 | fifo->f2_full = 1; | |
1503 | } | |
1504 | ||
1505 | static int sw842_decompress(const unsigned char *src, int srclen, | |
1506 | unsigned char *dst, int *destlen, | |
1507 | const void *wrkmem) | |
1508 | { | |
1509 | uint8_t tmpl; | |
1510 | const char *inbuf; | |
1511 | int inbit = 0; | |
1512 | unsigned char *outbuf, *outbuf_end, *origbuf, *prevbuf; | |
1513 | const char *inbuf_end; | |
1514 | sw842_template_op op; | |
1515 | int opindex; | |
1516 | int i, repeat_count; | |
1517 | struct sw842_fifo *fifo; | |
1518 | int ret = 0; | |
1519 | ||
1520 | fifo = &((struct nx842_workmem *)(wrkmem))->swfifo; | |
1521 | memset(fifo, 0, sizeof(*fifo)); | |
1522 | ||
1523 | origbuf = NULL; | |
1524 | inbuf = src; | |
1525 | inbuf_end = src + srclen; | |
1526 | outbuf = dst; | |
1527 | outbuf_end = dst + *destlen; | |
1528 | ||
1529 | while ((tmpl = sw842_get_template(&inbuf, &inbit)) != SW842_TMPL_EOF) { | |
1530 | if (inbuf >= inbuf_end) { | |
1531 | ret = -EINVAL; | |
1532 | goto out; | |
1533 | } | |
1534 | ||
1535 | opindex = 0; | |
1536 | prevbuf = origbuf; | |
1537 | origbuf = outbuf; | |
1538 | switch (tmpl) { | |
1539 | case SW842_TMPL_REPEAT: | |
1540 | if (prevbuf == NULL) { | |
1541 | ret = -EINVAL; | |
1542 | goto out; | |
1543 | } | |
1544 | ||
1545 | repeat_count = sw842_get_repeat_count(&inbuf, | |
1546 | &inbit) + 1; | |
1547 | ||
1548 | /* Did the repeat count advance past the end of input */ | |
1549 | if (inbuf > inbuf_end) { | |
1550 | ret = -EINVAL; | |
1551 | goto out; | |
1552 | } | |
1553 | ||
1554 | for (i = 0; i < repeat_count; i++) { | |
1555 | /* Would this overflow the output buffer */ | |
1556 | if ((outbuf + 8) > outbuf_end) { | |
1557 | ret = -ENOSPC; | |
1558 | goto out; | |
1559 | } | |
1560 | ||
1561 | memcpy(outbuf, prevbuf, 8); | |
1562 | sw842_copy_to_fifo(outbuf, fifo); | |
1563 | outbuf += 8; | |
1564 | } | |
1565 | break; | |
1566 | ||
1567 | case SW842_TMPL_ZEROS: | |
1568 | /* Would this overflow the output buffer */ | |
1569 | if ((outbuf + 8) > outbuf_end) { | |
1570 | ret = -ENOSPC; | |
1571 | goto out; | |
1572 | } | |
1573 | ||
1574 | memset(outbuf, 0, 8); | |
1575 | sw842_copy_to_fifo(outbuf, fifo); | |
1576 | outbuf += 8; | |
1577 | break; | |
1578 | ||
1579 | default: | |
1580 | if (tmpl > 25) { | |
1581 | ret = -EINVAL; | |
1582 | goto out; | |
1583 | } | |
1584 | ||
1585 | /* Does this go past the end of the input buffer */ | |
1586 | if ((inbuf + 2) > inbuf_end) { | |
1587 | ret = -EINVAL; | |
1588 | goto out; | |
1589 | } | |
1590 | ||
1591 | /* Would this overflow the output buffer */ | |
1592 | if ((outbuf + 8) > outbuf_end) { | |
1593 | ret = -ENOSPC; | |
1594 | goto out; | |
1595 | } | |
1596 | ||
1597 | while (opindex < 4 && | |
1598 | (op = sw842_tmpl_ops[tmpl][opindex++]) | |
1599 | != NULL) { | |
1600 | ret = (*op)(&inbuf, &inbit, &outbuf, fifo); | |
1601 | if (ret) { | |
1602 | ret = -EINVAL; | |
1603 | goto out; | |
1604 | } | |
1605 | sw842_copy_to_fifo(origbuf, fifo); | |
1606 | } | |
1607 | } | |
1608 | } | |
1609 | ||
1610 | out: | |
1611 | if (!ret) | |
1612 | *destlen = (unsigned int)(outbuf - dst); | |
1613 | else | |
1614 | *destlen = 0; | |
1615 | ||
1616 | return ret; | |
1617 | } |