Commit | Line | Data |
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f6ce7f20 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
0e16aafb SJ |
2 | /* |
3 | * Driver for IBM Power 842 compression accelerator | |
4 | * | |
0e16aafb SJ |
5 | * Copyright (C) IBM Corporation, 2012 |
6 | * | |
7 | * Authors: Robert Jennings <rcj@linux.vnet.ibm.com> | |
8 | * Seth Jennings <sjenning@linux.vnet.ibm.com> | |
9 | */ | |
10 | ||
33b58b01 | 11 | #include <asm/vio.h> |
b4ba2211 HM |
12 | #include <asm/hvcall.h> |
13 | #include <asm/vas.h> | |
0e16aafb | 14 | |
7011a122 | 15 | #include "nx-842.h" |
0e16aafb SJ |
16 | #include "nx_csbcpb.h" /* struct nx_csbcpb */ |
17 | ||
0e16aafb SJ |
18 | MODULE_LICENSE("GPL"); |
19 | MODULE_AUTHOR("Robert Jennings <rcj@linux.vnet.ibm.com>"); | |
20 | MODULE_DESCRIPTION("842 H/W Compression driver for IBM Power processors"); | |
03952d98 DS |
21 | MODULE_ALIAS_CRYPTO("842"); |
22 | MODULE_ALIAS_CRYPTO("842-nx"); | |
0e16aafb | 23 | |
b4ba2211 HM |
24 | /* |
25 | * Coprocessor type specific capabilities from the hypervisor. | |
26 | */ | |
27 | struct hv_nx_cop_caps { | |
28 | __be64 descriptor; | |
29 | __be64 req_max_processed_len; /* Max bytes in one GZIP request */ | |
30 | __be64 min_compress_len; /* Min compression size in bytes */ | |
31 | __be64 min_decompress_len; /* Min decompression size in bytes */ | |
32 | } __packed __aligned(0x1000); | |
33 | ||
34 | /* | |
35 | * Coprocessor type specific capabilities. | |
36 | */ | |
37 | struct nx_cop_caps { | |
38 | u64 descriptor; | |
39 | u64 req_max_processed_len; /* Max bytes in one GZIP request */ | |
40 | u64 min_compress_len; /* Min compression in bytes */ | |
41 | u64 min_decompress_len; /* Min decompression in bytes */ | |
42 | }; | |
43 | ||
44 | static u64 caps_feat; | |
45 | static struct nx_cop_caps nx_cop_caps; | |
46 | ||
959e6659 | 47 | static struct nx842_constraints nx842_pseries_constraints = { |
3154de71 | 48 | .alignment = DDE_BUFFER_ALIGN, |
959e6659 | 49 | .multiple = DDE_BUFFER_LAST_MULT, |
3154de71 | 50 | .minimum = DDE_BUFFER_LAST_MULT, |
959e6659 DS |
51 | .maximum = PAGE_SIZE, /* dynamic, max_sync_size */ |
52 | }; | |
53 | ||
b8e04187 | 54 | static int check_constraints(unsigned long buf, unsigned int *len, bool in) |
0e16aafb | 55 | { |
b8e04187 DS |
56 | if (!IS_ALIGNED(buf, nx842_pseries_constraints.alignment)) { |
57 | pr_debug("%s buffer 0x%lx not aligned to 0x%x\n", | |
58 | in ? "input" : "output", buf, | |
59 | nx842_pseries_constraints.alignment); | |
60 | return -EINVAL; | |
61 | } | |
62 | if (*len % nx842_pseries_constraints.multiple) { | |
63 | pr_debug("%s buffer len 0x%x not multiple of 0x%x\n", | |
64 | in ? "input" : "output", *len, | |
65 | nx842_pseries_constraints.multiple); | |
66 | if (in) | |
67 | return -EINVAL; | |
68 | *len = round_down(*len, nx842_pseries_constraints.multiple); | |
69 | } | |
70 | if (*len < nx842_pseries_constraints.minimum) { | |
71 | pr_debug("%s buffer len 0x%x under minimum 0x%x\n", | |
72 | in ? "input" : "output", *len, | |
73 | nx842_pseries_constraints.minimum); | |
74 | return -EINVAL; | |
75 | } | |
76 | if (*len > nx842_pseries_constraints.maximum) { | |
77 | pr_debug("%s buffer len 0x%x over maximum 0x%x\n", | |
78 | in ? "input" : "output", *len, | |
79 | nx842_pseries_constraints.maximum); | |
80 | if (in) | |
81 | return -EINVAL; | |
82 | *len = nx842_pseries_constraints.maximum; | |
83 | } | |
84 | return 0; | |
0e16aafb SJ |
85 | } |
86 | ||
b8e04187 DS |
87 | /* I assume we need to align the CSB? */ |
88 | #define WORKMEM_ALIGN (256) | |
89 | ||
90 | struct nx842_workmem { | |
91 | /* scatterlist */ | |
92 | char slin[4096]; | |
93 | char slout[4096]; | |
94 | /* coprocessor status/parameter block */ | |
95 | struct nx_csbcpb csbcpb; | |
96 | ||
97 | char padding[WORKMEM_ALIGN]; | |
98 | } __aligned(WORKMEM_ALIGN); | |
99 | ||
0e16aafb SJ |
100 | /* Macros for fields within nx_csbcpb */ |
101 | /* Check the valid bit within the csbcpb valid field */ | |
102 | #define NX842_CSBCBP_VALID_CHK(x) (x & BIT_MASK(7)) | |
103 | ||
104 | /* CE macros operate on the completion_extension field bits in the csbcpb. | |
105 | * CE0 0=full completion, 1=partial completion | |
106 | * CE1 0=CE0 indicates completion, 1=termination (output may be modified) | |
107 | * CE2 0=processed_bytes is source bytes, 1=processed_bytes is target bytes */ | |
108 | #define NX842_CSBCPB_CE0(x) (x & BIT_MASK(7)) | |
109 | #define NX842_CSBCPB_CE1(x) (x & BIT_MASK(6)) | |
110 | #define NX842_CSBCPB_CE2(x) (x & BIT_MASK(5)) | |
111 | ||
112 | /* The NX unit accepts data only on 4K page boundaries */ | |
b8e04187 | 113 | #define NX842_HW_PAGE_SIZE (4096) |
0e16aafb SJ |
114 | #define NX842_HW_PAGE_MASK (~(NX842_HW_PAGE_SIZE-1)) |
115 | ||
0e16aafb SJ |
116 | struct ibm_nx842_counters { |
117 | atomic64_t comp_complete; | |
118 | atomic64_t comp_failed; | |
119 | atomic64_t decomp_complete; | |
120 | atomic64_t decomp_failed; | |
121 | atomic64_t swdecomp; | |
122 | atomic64_t comp_times[32]; | |
123 | atomic64_t decomp_times[32]; | |
124 | }; | |
125 | ||
6084466e | 126 | struct nx842_devdata { |
0e16aafb SJ |
127 | struct vio_dev *vdev; |
128 | struct device *dev; | |
129 | struct ibm_nx842_counters *counters; | |
130 | unsigned int max_sg_len; | |
131 | unsigned int max_sync_size; | |
132 | unsigned int max_sync_sg; | |
6084466e HX |
133 | }; |
134 | ||
135 | static struct nx842_devdata __rcu *devdata; | |
0e16aafb SJ |
136 | static DEFINE_SPINLOCK(devdata_mutex); |
137 | ||
138 | #define NX842_COUNTER_INC(_x) \ | |
139 | static inline void nx842_inc_##_x( \ | |
140 | const struct nx842_devdata *dev) { \ | |
141 | if (dev) \ | |
142 | atomic64_inc(&dev->counters->_x); \ | |
143 | } | |
144 | NX842_COUNTER_INC(comp_complete); | |
145 | NX842_COUNTER_INC(comp_failed); | |
146 | NX842_COUNTER_INC(decomp_complete); | |
147 | NX842_COUNTER_INC(decomp_failed); | |
148 | NX842_COUNTER_INC(swdecomp); | |
149 | ||
150 | #define NX842_HIST_SLOTS 16 | |
151 | ||
152 | static void ibm_nx842_incr_hist(atomic64_t *times, unsigned int time) | |
153 | { | |
154 | int bucket = fls(time); | |
155 | ||
156 | if (bucket) | |
157 | bucket = min((NX842_HIST_SLOTS - 1), bucket - 1); | |
158 | ||
159 | atomic64_inc(×[bucket]); | |
160 | } | |
161 | ||
162 | /* NX unit operation flags */ | |
163 | #define NX842_OP_COMPRESS 0x0 | |
164 | #define NX842_OP_CRC 0x1 | |
165 | #define NX842_OP_DECOMPRESS 0x2 | |
166 | #define NX842_OP_COMPRESS_CRC (NX842_OP_COMPRESS | NX842_OP_CRC) | |
167 | #define NX842_OP_DECOMPRESS_CRC (NX842_OP_DECOMPRESS | NX842_OP_CRC) | |
168 | #define NX842_OP_ASYNC (1<<23) | |
169 | #define NX842_OP_NOTIFY (1<<22) | |
170 | #define NX842_OP_NOTIFY_INT(x) ((x & 0xff)<<8) | |
171 | ||
172 | static unsigned long nx842_get_desired_dma(struct vio_dev *viodev) | |
173 | { | |
174 | /* No use of DMA mappings within the driver. */ | |
175 | return 0; | |
176 | } | |
177 | ||
178 | struct nx842_slentry { | |
c47d6302 DS |
179 | __be64 ptr; /* Real address (use __pa()) */ |
180 | __be64 len; | |
0e16aafb SJ |
181 | }; |
182 | ||
183 | /* pHyp scatterlist entry */ | |
184 | struct nx842_scatterlist { | |
185 | int entry_nr; /* number of slentries */ | |
186 | struct nx842_slentry *entries; /* ptr to array of slentries */ | |
187 | }; | |
188 | ||
189 | /* Does not include sizeof(entry_nr) in the size */ | |
190 | static inline unsigned long nx842_get_scatterlist_size( | |
191 | struct nx842_scatterlist *sl) | |
192 | { | |
193 | return sl->entry_nr * sizeof(struct nx842_slentry); | |
194 | } | |
195 | ||
196 | static int nx842_build_scatterlist(unsigned long buf, int len, | |
197 | struct nx842_scatterlist *sl) | |
198 | { | |
c47d6302 | 199 | unsigned long entrylen; |
0e16aafb SJ |
200 | struct nx842_slentry *entry; |
201 | ||
202 | sl->entry_nr = 0; | |
203 | ||
204 | entry = sl->entries; | |
205 | while (len) { | |
c47d6302 DS |
206 | entry->ptr = cpu_to_be64(nx842_get_pa((void *)buf)); |
207 | entrylen = min_t(int, len, | |
208 | LEN_ON_SIZE(buf, NX842_HW_PAGE_SIZE)); | |
209 | entry->len = cpu_to_be64(entrylen); | |
210 | ||
211 | len -= entrylen; | |
212 | buf += entrylen; | |
213 | ||
0e16aafb SJ |
214 | sl->entry_nr++; |
215 | entry++; | |
216 | } | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
0e16aafb SJ |
221 | static int nx842_validate_result(struct device *dev, |
222 | struct cop_status_block *csb) | |
223 | { | |
224 | /* The csb must be valid after returning from vio_h_cop_sync */ | |
225 | if (!NX842_CSBCBP_VALID_CHK(csb->valid)) { | |
226 | dev_err(dev, "%s: cspcbp not valid upon completion.\n", | |
227 | __func__); | |
228 | dev_dbg(dev, "valid:0x%02x cs:0x%02x cc:0x%02x ce:0x%02x\n", | |
229 | csb->valid, | |
230 | csb->crb_seq_number, | |
231 | csb->completion_code, | |
232 | csb->completion_extension); | |
233 | dev_dbg(dev, "processed_bytes:%d address:0x%016lx\n", | |
c47d6302 DS |
234 | be32_to_cpu(csb->processed_byte_count), |
235 | (unsigned long)be64_to_cpu(csb->address)); | |
0e16aafb SJ |
236 | return -EIO; |
237 | } | |
238 | ||
239 | /* Check return values from the hardware in the CSB */ | |
240 | switch (csb->completion_code) { | |
241 | case 0: /* Completed without error */ | |
242 | break; | |
7371c0a5 DS |
243 | case 64: /* Compression ok, but output larger than input */ |
244 | dev_dbg(dev, "%s: output size larger than input size\n", | |
245 | __func__); | |
246 | break; | |
0e16aafb | 247 | case 13: /* Output buffer too small */ |
7371c0a5 | 248 | dev_dbg(dev, "%s: Out of space in output buffer\n", |
0e16aafb SJ |
249 | __func__); |
250 | return -ENOSPC; | |
ea0b3984 HM |
251 | case 65: /* Calculated CRC doesn't match the passed value */ |
252 | dev_dbg(dev, "%s: CRC mismatch for decompression\n", | |
253 | __func__); | |
254 | return -EINVAL; | |
0e16aafb SJ |
255 | case 66: /* Input data contains an illegal template field */ |
256 | case 67: /* Template indicates data past the end of the input stream */ | |
257 | dev_dbg(dev, "%s: Bad data for decompression (code:%d)\n", | |
258 | __func__, csb->completion_code); | |
259 | return -EINVAL; | |
260 | default: | |
261 | dev_dbg(dev, "%s: Unspecified error (code:%d)\n", | |
262 | __func__, csb->completion_code); | |
263 | return -EIO; | |
264 | } | |
265 | ||
266 | /* Hardware sanity check */ | |
267 | if (!NX842_CSBCPB_CE2(csb->completion_extension)) { | |
268 | dev_err(dev, "%s: No error returned by hardware, but " | |
269 | "data returned is unusable, contact support.\n" | |
270 | "(Additional info: csbcbp->processed bytes " | |
271 | "does not specify processed bytes for the " | |
272 | "target buffer.)\n", __func__); | |
273 | return -EIO; | |
274 | } | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
279 | /** | |
7011a122 | 280 | * nx842_pseries_compress - Compress data using the 842 algorithm |
0e16aafb SJ |
281 | * |
282 | * Compression provide by the NX842 coprocessor on IBM Power systems. | |
283 | * The input buffer is compressed and the result is stored in the | |
284 | * provided output buffer. | |
285 | * | |
286 | * Upon return from this function @outlen contains the length of the | |
287 | * compressed data. If there is an error then @outlen will be 0 and an | |
288 | * error will be specified by the return code from this function. | |
289 | * | |
b8e04187 DS |
290 | * @in: Pointer to input buffer |
291 | * @inlen: Length of input buffer | |
0e16aafb SJ |
292 | * @out: Pointer to output buffer |
293 | * @outlen: Length of output buffer | |
c215b513 LJ |
294 | * @wmem: ptr to buffer for working memory, size determined by |
295 | * nx842_pseries_driver.workmem_size | |
0e16aafb SJ |
296 | * |
297 | * Returns: | |
298 | * 0 Success, output of length @outlen stored in the buffer at @out | |
299 | * -ENOMEM Unable to allocate internal buffers | |
300 | * -ENOSPC Output buffer is to small | |
0e16aafb SJ |
301 | * -EIO Internal error |
302 | * -ENODEV Hardware unavailable | |
303 | */ | |
7011a122 DS |
304 | static int nx842_pseries_compress(const unsigned char *in, unsigned int inlen, |
305 | unsigned char *out, unsigned int *outlen, | |
306 | void *wmem) | |
0e16aafb | 307 | { |
0e16aafb SJ |
308 | struct nx842_devdata *local_devdata; |
309 | struct device *dev = NULL; | |
310 | struct nx842_workmem *workmem; | |
311 | struct nx842_scatterlist slin, slout; | |
312 | struct nx_csbcpb *csbcpb; | |
f947d7fd | 313 | int ret = 0; |
b8e04187 | 314 | unsigned long inbuf, outbuf; |
0e16aafb SJ |
315 | struct vio_pfo_op op = { |
316 | .done = NULL, | |
317 | .handle = 0, | |
318 | .timeout = 0, | |
319 | }; | |
b8e04187 | 320 | unsigned long start = get_tb(); |
0e16aafb | 321 | |
0e16aafb | 322 | inbuf = (unsigned long)in; |
b8e04187 DS |
323 | if (check_constraints(inbuf, &inlen, true)) |
324 | return -EINVAL; | |
325 | ||
326 | outbuf = (unsigned long)out; | |
327 | if (check_constraints(outbuf, outlen, false)) | |
0e16aafb SJ |
328 | return -EINVAL; |
329 | ||
330 | rcu_read_lock(); | |
331 | local_devdata = rcu_dereference(devdata); | |
332 | if (!local_devdata || !local_devdata->dev) { | |
333 | rcu_read_unlock(); | |
334 | return -ENODEV; | |
335 | } | |
0e16aafb SJ |
336 | dev = local_devdata->dev; |
337 | ||
0e16aafb | 338 | /* Init scatterlist */ |
b8e04187 | 339 | workmem = PTR_ALIGN(wmem, WORKMEM_ALIGN); |
0e16aafb SJ |
340 | slin.entries = (struct nx842_slentry *)workmem->slin; |
341 | slout.entries = (struct nx842_slentry *)workmem->slout; | |
342 | ||
343 | /* Init operation */ | |
ea0b3984 | 344 | op.flags = NX842_OP_COMPRESS_CRC; |
0e16aafb SJ |
345 | csbcpb = &workmem->csbcpb; |
346 | memset(csbcpb, 0, sizeof(*csbcpb)); | |
0ba3e101 | 347 | op.csbcpb = nx842_get_pa(csbcpb); |
0e16aafb | 348 | |
b8e04187 DS |
349 | if ((inbuf & NX842_HW_PAGE_MASK) == |
350 | ((inbuf + inlen - 1) & NX842_HW_PAGE_MASK)) { | |
351 | /* Create direct DDE */ | |
352 | op.in = nx842_get_pa((void *)inbuf); | |
353 | op.inlen = inlen; | |
354 | } else { | |
355 | /* Create indirect DDE (scatterlist) */ | |
356 | nx842_build_scatterlist(inbuf, inlen, &slin); | |
357 | op.in = nx842_get_pa(slin.entries); | |
358 | op.inlen = -nx842_get_scatterlist_size(&slin); | |
359 | } | |
0e16aafb | 360 | |
b8e04187 DS |
361 | if ((outbuf & NX842_HW_PAGE_MASK) == |
362 | ((outbuf + *outlen - 1) & NX842_HW_PAGE_MASK)) { | |
363 | /* Create direct DDE */ | |
364 | op.out = nx842_get_pa((void *)outbuf); | |
365 | op.outlen = *outlen; | |
366 | } else { | |
367 | /* Create indirect DDE (scatterlist) */ | |
368 | nx842_build_scatterlist(outbuf, *outlen, &slout); | |
369 | op.out = nx842_get_pa(slout.entries); | |
0e16aafb | 370 | op.outlen = -nx842_get_scatterlist_size(&slout); |
b8e04187 | 371 | } |
0e16aafb | 372 | |
c47d6302 DS |
373 | dev_dbg(dev, "%s: op.in %lx op.inlen %ld op.out %lx op.outlen %ld\n", |
374 | __func__, (unsigned long)op.in, (long)op.inlen, | |
375 | (unsigned long)op.out, (long)op.outlen); | |
376 | ||
b8e04187 DS |
377 | /* Send request to pHyp */ |
378 | ret = vio_h_cop_sync(local_devdata->vdev, &op); | |
0e16aafb | 379 | |
b8e04187 DS |
380 | /* Check for pHyp error */ |
381 | if (ret) { | |
382 | dev_dbg(dev, "%s: vio_h_cop_sync error (ret=%d, hret=%ld)\n", | |
383 | __func__, ret, op.hcall_err); | |
384 | ret = -EIO; | |
385 | goto unlock; | |
0e16aafb SJ |
386 | } |
387 | ||
b8e04187 DS |
388 | /* Check for hardware error */ |
389 | ret = nx842_validate_result(dev, &csbcpb->csb); | |
390 | if (ret) | |
391 | goto unlock; | |
392 | ||
c47d6302 | 393 | *outlen = be32_to_cpu(csbcpb->csb.processed_byte_count); |
b8e04187 | 394 | dev_dbg(dev, "%s: processed_bytes=%d\n", __func__, *outlen); |
0e16aafb SJ |
395 | |
396 | unlock: | |
397 | if (ret) | |
398 | nx842_inc_comp_failed(local_devdata); | |
399 | else { | |
400 | nx842_inc_comp_complete(local_devdata); | |
401 | ibm_nx842_incr_hist(local_devdata->counters->comp_times, | |
b8e04187 | 402 | (get_tb() - start) / tb_ticks_per_usec); |
0e16aafb SJ |
403 | } |
404 | rcu_read_unlock(); | |
405 | return ret; | |
406 | } | |
0e16aafb | 407 | |
0e16aafb | 408 | /** |
7011a122 | 409 | * nx842_pseries_decompress - Decompress data using the 842 algorithm |
0e16aafb SJ |
410 | * |
411 | * Decompression provide by the NX842 coprocessor on IBM Power systems. | |
412 | * The input buffer is decompressed and the result is stored in the | |
413 | * provided output buffer. The size allocated to the output buffer is | |
414 | * provided by the caller of this function in @outlen. Upon return from | |
415 | * this function @outlen contains the length of the decompressed data. | |
416 | * If there is an error then @outlen will be 0 and an error will be | |
417 | * specified by the return code from this function. | |
418 | * | |
b8e04187 | 419 | * @in: Pointer to input buffer |
0e16aafb | 420 | * @inlen: Length of input buffer |
b8e04187 DS |
421 | * @out: Pointer to output buffer |
422 | * @outlen: Length of output buffer | |
c215b513 LJ |
423 | * @wmem: ptr to buffer for working memory, size determined by |
424 | * nx842_pseries_driver.workmem_size | |
0e16aafb SJ |
425 | * |
426 | * Returns: | |
427 | * 0 Success, output of length @outlen stored in the buffer at @out | |
428 | * -ENODEV Hardware decompression device is unavailable | |
429 | * -ENOMEM Unable to allocate internal buffers | |
430 | * -ENOSPC Output buffer is to small | |
431 | * -EINVAL Bad input data encountered when attempting decompress | |
432 | * -EIO Internal error | |
433 | */ | |
7011a122 DS |
434 | static int nx842_pseries_decompress(const unsigned char *in, unsigned int inlen, |
435 | unsigned char *out, unsigned int *outlen, | |
436 | void *wmem) | |
0e16aafb | 437 | { |
0e16aafb SJ |
438 | struct nx842_devdata *local_devdata; |
439 | struct device *dev = NULL; | |
440 | struct nx842_workmem *workmem; | |
441 | struct nx842_scatterlist slin, slout; | |
442 | struct nx_csbcpb *csbcpb; | |
f947d7fd | 443 | int ret = 0; |
0e16aafb SJ |
444 | unsigned long inbuf, outbuf; |
445 | struct vio_pfo_op op = { | |
446 | .done = NULL, | |
447 | .handle = 0, | |
448 | .timeout = 0, | |
449 | }; | |
b8e04187 | 450 | unsigned long start = get_tb(); |
0e16aafb SJ |
451 | |
452 | /* Ensure page alignment and size */ | |
b8e04187 DS |
453 | inbuf = (unsigned long)in; |
454 | if (check_constraints(inbuf, &inlen, true)) | |
455 | return -EINVAL; | |
456 | ||
0e16aafb | 457 | outbuf = (unsigned long)out; |
b8e04187 | 458 | if (check_constraints(outbuf, outlen, false)) |
0e16aafb SJ |
459 | return -EINVAL; |
460 | ||
461 | rcu_read_lock(); | |
462 | local_devdata = rcu_dereference(devdata); | |
b8e04187 DS |
463 | if (!local_devdata || !local_devdata->dev) { |
464 | rcu_read_unlock(); | |
465 | return -ENODEV; | |
0e16aafb | 466 | } |
b8e04187 DS |
467 | dev = local_devdata->dev; |
468 | ||
469 | workmem = PTR_ALIGN(wmem, WORKMEM_ALIGN); | |
0e16aafb SJ |
470 | |
471 | /* Init scatterlist */ | |
472 | slin.entries = (struct nx842_slentry *)workmem->slin; | |
473 | slout.entries = (struct nx842_slentry *)workmem->slout; | |
474 | ||
475 | /* Init operation */ | |
ea0b3984 | 476 | op.flags = NX842_OP_DECOMPRESS_CRC; |
0e16aafb SJ |
477 | csbcpb = &workmem->csbcpb; |
478 | memset(csbcpb, 0, sizeof(*csbcpb)); | |
0ba3e101 | 479 | op.csbcpb = nx842_get_pa(csbcpb); |
0e16aafb | 480 | |
b8e04187 DS |
481 | if ((inbuf & NX842_HW_PAGE_MASK) == |
482 | ((inbuf + inlen - 1) & NX842_HW_PAGE_MASK)) { | |
483 | /* Create direct DDE */ | |
484 | op.in = nx842_get_pa((void *)inbuf); | |
485 | op.inlen = inlen; | |
486 | } else { | |
487 | /* Create indirect DDE (scatterlist) */ | |
488 | nx842_build_scatterlist(inbuf, inlen, &slin); | |
489 | op.in = nx842_get_pa(slin.entries); | |
490 | op.inlen = -nx842_get_scatterlist_size(&slin); | |
491 | } | |
0e16aafb | 492 | |
b8e04187 DS |
493 | if ((outbuf & NX842_HW_PAGE_MASK) == |
494 | ((outbuf + *outlen - 1) & NX842_HW_PAGE_MASK)) { | |
495 | /* Create direct DDE */ | |
496 | op.out = nx842_get_pa((void *)outbuf); | |
497 | op.outlen = *outlen; | |
498 | } else { | |
499 | /* Create indirect DDE (scatterlist) */ | |
500 | nx842_build_scatterlist(outbuf, *outlen, &slout); | |
501 | op.out = nx842_get_pa(slout.entries); | |
502 | op.outlen = -nx842_get_scatterlist_size(&slout); | |
503 | } | |
0e16aafb | 504 | |
c47d6302 DS |
505 | dev_dbg(dev, "%s: op.in %lx op.inlen %ld op.out %lx op.outlen %ld\n", |
506 | __func__, (unsigned long)op.in, (long)op.inlen, | |
507 | (unsigned long)op.out, (long)op.outlen); | |
508 | ||
b8e04187 DS |
509 | /* Send request to pHyp */ |
510 | ret = vio_h_cop_sync(local_devdata->vdev, &op); | |
0e16aafb | 511 | |
b8e04187 DS |
512 | /* Check for pHyp error */ |
513 | if (ret) { | |
514 | dev_dbg(dev, "%s: vio_h_cop_sync error (ret=%d, hret=%ld)\n", | |
515 | __func__, ret, op.hcall_err); | |
516 | goto unlock; | |
0e16aafb SJ |
517 | } |
518 | ||
b8e04187 DS |
519 | /* Check for hardware error */ |
520 | ret = nx842_validate_result(dev, &csbcpb->csb); | |
521 | if (ret) | |
522 | goto unlock; | |
523 | ||
c47d6302 | 524 | *outlen = be32_to_cpu(csbcpb->csb.processed_byte_count); |
0e16aafb SJ |
525 | |
526 | unlock: | |
527 | if (ret) | |
528 | /* decompress fail */ | |
529 | nx842_inc_decomp_failed(local_devdata); | |
530 | else { | |
0e16aafb SJ |
531 | nx842_inc_decomp_complete(local_devdata); |
532 | ibm_nx842_incr_hist(local_devdata->counters->decomp_times, | |
b8e04187 | 533 | (get_tb() - start) / tb_ticks_per_usec); |
0e16aafb SJ |
534 | } |
535 | ||
536 | rcu_read_unlock(); | |
537 | return ret; | |
538 | } | |
0e16aafb SJ |
539 | |
540 | /** | |
541 | * nx842_OF_set_defaults -- Set default (disabled) values for devdata | |
542 | * | |
c215b513 | 543 | * @devdata: struct nx842_devdata to update |
0e16aafb SJ |
544 | * |
545 | * Returns: | |
546 | * 0 on success | |
547 | * -ENOENT if @devdata ptr is NULL | |
548 | */ | |
549 | static int nx842_OF_set_defaults(struct nx842_devdata *devdata) | |
550 | { | |
551 | if (devdata) { | |
552 | devdata->max_sync_size = 0; | |
553 | devdata->max_sync_sg = 0; | |
554 | devdata->max_sg_len = 0; | |
0e16aafb SJ |
555 | return 0; |
556 | } else | |
557 | return -ENOENT; | |
558 | } | |
559 | ||
560 | /** | |
90fd73f9 | 561 | * nx842_OF_upd_status -- Check the device info from OF status prop |
0e16aafb SJ |
562 | * |
563 | * The status property indicates if the accelerator is enabled. If the | |
564 | * device is in the OF tree it indicates that the hardware is present. | |
565 | * The status field indicates if the device is enabled when the status | |
566 | * is 'okay'. Otherwise the device driver will be disabled. | |
567 | * | |
2a96726b | 568 | * @devdata: struct nx842_devdata to use for dev_info |
c215b513 | 569 | * @prop: struct property point containing the maxsyncop for the update |
0e16aafb SJ |
570 | * |
571 | * Returns: | |
572 | * 0 - Device is available | |
fa9a9a08 | 573 | * -ENODEV - Device is not available |
0e16aafb | 574 | */ |
2a96726b HX |
575 | static int nx842_OF_upd_status(struct nx842_devdata *devdata, |
576 | struct property *prop) | |
90fd73f9 | 577 | { |
0e16aafb SJ |
578 | const char *status = (const char *)prop->value; |
579 | ||
90fd73f9 DS |
580 | if (!strncmp(status, "okay", (size_t)prop->length)) |
581 | return 0; | |
582 | if (!strncmp(status, "disabled", (size_t)prop->length)) | |
583 | return -ENODEV; | |
584 | dev_info(devdata->dev, "%s: unknown status '%s'\n", __func__, status); | |
0e16aafb | 585 | |
90fd73f9 | 586 | return -EINVAL; |
0e16aafb SJ |
587 | } |
588 | ||
589 | /** | |
590 | * nx842_OF_upd_maxsglen -- Update the device info from OF maxsglen prop | |
591 | * | |
592 | * Definition of the 'ibm,max-sg-len' OF property: | |
593 | * This field indicates the maximum byte length of a scatter list | |
594 | * for the platform facility. It is a single cell encoded as with encode-int. | |
595 | * | |
596 | * Example: | |
597 | * # od -x ibm,max-sg-len | |
598 | * 0000000 0000 0ff0 | |
599 | * | |
600 | * In this example, the maximum byte length of a scatter list is | |
601 | * 0x0ff0 (4,080). | |
602 | * | |
c215b513 LJ |
603 | * @devdata: struct nx842_devdata to update |
604 | * @prop: struct property point containing the maxsyncop for the update | |
0e16aafb SJ |
605 | * |
606 | * Returns: | |
607 | * 0 on success | |
608 | * -EINVAL on failure | |
609 | */ | |
610 | static int nx842_OF_upd_maxsglen(struct nx842_devdata *devdata, | |
611 | struct property *prop) { | |
612 | int ret = 0; | |
c47d6302 | 613 | const unsigned int maxsglen = of_read_number(prop->value, 1); |
0e16aafb | 614 | |
c47d6302 | 615 | if (prop->length != sizeof(maxsglen)) { |
0e16aafb SJ |
616 | dev_err(devdata->dev, "%s: unexpected format for ibm,max-sg-len property\n", __func__); |
617 | dev_dbg(devdata->dev, "%s: ibm,max-sg-len is %d bytes long, expected %lu bytes\n", __func__, | |
c47d6302 | 618 | prop->length, sizeof(maxsglen)); |
0e16aafb SJ |
619 | ret = -EINVAL; |
620 | } else { | |
c47d6302 DS |
621 | devdata->max_sg_len = min_t(unsigned int, |
622 | maxsglen, NX842_HW_PAGE_SIZE); | |
0e16aafb SJ |
623 | } |
624 | ||
625 | return ret; | |
626 | } | |
627 | ||
628 | /** | |
629 | * nx842_OF_upd_maxsyncop -- Update the device info from OF maxsyncop prop | |
630 | * | |
631 | * Definition of the 'ibm,max-sync-cop' OF property: | |
632 | * Two series of cells. The first series of cells represents the maximums | |
633 | * that can be synchronously compressed. The second series of cells | |
634 | * represents the maximums that can be synchronously decompressed. | |
635 | * 1. The first cell in each series contains the count of the number of | |
636 | * data length, scatter list elements pairs that follow – each being | |
637 | * of the form | |
638 | * a. One cell data byte length | |
639 | * b. One cell total number of scatter list elements | |
640 | * | |
641 | * Example: | |
642 | * # od -x ibm,max-sync-cop | |
643 | * 0000000 0000 0001 0000 1000 0000 01fe 0000 0001 | |
644 | * 0000020 0000 1000 0000 01fe | |
645 | * | |
646 | * In this example, compression supports 0x1000 (4,096) data byte length | |
647 | * and 0x1fe (510) total scatter list elements. Decompression supports | |
648 | * 0x1000 (4,096) data byte length and 0x1f3 (510) total scatter list | |
649 | * elements. | |
650 | * | |
c215b513 LJ |
651 | * @devdata: struct nx842_devdata to update |
652 | * @prop: struct property point containing the maxsyncop for the update | |
0e16aafb SJ |
653 | * |
654 | * Returns: | |
655 | * 0 on success | |
656 | * -EINVAL on failure | |
657 | */ | |
658 | static int nx842_OF_upd_maxsyncop(struct nx842_devdata *devdata, | |
659 | struct property *prop) { | |
660 | int ret = 0; | |
c47d6302 DS |
661 | unsigned int comp_data_limit, decomp_data_limit; |
662 | unsigned int comp_sg_limit, decomp_sg_limit; | |
0e16aafb | 663 | const struct maxsynccop_t { |
c47d6302 DS |
664 | __be32 comp_elements; |
665 | __be32 comp_data_limit; | |
666 | __be32 comp_sg_limit; | |
667 | __be32 decomp_elements; | |
668 | __be32 decomp_data_limit; | |
669 | __be32 decomp_sg_limit; | |
0e16aafb SJ |
670 | } *maxsynccop; |
671 | ||
672 | if (prop->length != sizeof(*maxsynccop)) { | |
673 | dev_err(devdata->dev, "%s: unexpected format for ibm,max-sync-cop property\n", __func__); | |
674 | dev_dbg(devdata->dev, "%s: ibm,max-sync-cop is %d bytes long, expected %lu bytes\n", __func__, prop->length, | |
675 | sizeof(*maxsynccop)); | |
676 | ret = -EINVAL; | |
677 | goto out; | |
678 | } | |
679 | ||
680 | maxsynccop = (const struct maxsynccop_t *)prop->value; | |
c47d6302 DS |
681 | comp_data_limit = be32_to_cpu(maxsynccop->comp_data_limit); |
682 | comp_sg_limit = be32_to_cpu(maxsynccop->comp_sg_limit); | |
683 | decomp_data_limit = be32_to_cpu(maxsynccop->decomp_data_limit); | |
684 | decomp_sg_limit = be32_to_cpu(maxsynccop->decomp_sg_limit); | |
0e16aafb SJ |
685 | |
686 | /* Use one limit rather than separate limits for compression and | |
687 | * decompression. Set a maximum for this so as not to exceed the | |
688 | * size that the header can support and round the value down to | |
689 | * the hardware page size (4K) */ | |
c47d6302 | 690 | devdata->max_sync_size = min(comp_data_limit, decomp_data_limit); |
0e16aafb SJ |
691 | |
692 | devdata->max_sync_size = min_t(unsigned int, devdata->max_sync_size, | |
b8e04187 | 693 | 65536); |
0e16aafb | 694 | |
b8e04187 | 695 | if (devdata->max_sync_size < 4096) { |
0e16aafb SJ |
696 | dev_err(devdata->dev, "%s: hardware max data size (%u) is " |
697 | "less than the driver minimum, unable to use " | |
698 | "the hardware device\n", | |
699 | __func__, devdata->max_sync_size); | |
700 | ret = -EINVAL; | |
701 | goto out; | |
702 | } | |
703 | ||
959e6659 DS |
704 | nx842_pseries_constraints.maximum = devdata->max_sync_size; |
705 | ||
c47d6302 | 706 | devdata->max_sync_sg = min(comp_sg_limit, decomp_sg_limit); |
0e16aafb SJ |
707 | if (devdata->max_sync_sg < 1) { |
708 | dev_err(devdata->dev, "%s: hardware max sg size (%u) is " | |
709 | "less than the driver minimum, unable to use " | |
710 | "the hardware device\n", | |
711 | __func__, devdata->max_sync_sg); | |
712 | ret = -EINVAL; | |
713 | goto out; | |
714 | } | |
715 | ||
716 | out: | |
717 | return ret; | |
718 | } | |
719 | ||
720 | /** | |
0e16aafb SJ |
721 | * nx842_OF_upd -- Handle OF properties updates for the device. |
722 | * | |
723 | * Set all properties from the OF tree. Optionally, a new property | |
724 | * can be provided by the @new_prop pointer to overwrite an existing value. | |
725 | * The device will remain disabled until all values are valid, this function | |
726 | * will return an error for updates unless all values are valid. | |
727 | * | |
728 | * @new_prop: If not NULL, this property is being updated. If NULL, update | |
729 | * all properties from the current values in the OF tree. | |
730 | * | |
731 | * Returns: | |
732 | * 0 - Success | |
733 | * -ENOMEM - Could not allocate memory for new devdata structure | |
734 | * -EINVAL - property value not found, new_prop is not a recognized | |
735 | * property for the device or property value is not valid. | |
736 | * -ENODEV - Device is not available | |
737 | */ | |
738 | static int nx842_OF_upd(struct property *new_prop) | |
739 | { | |
740 | struct nx842_devdata *old_devdata = NULL; | |
741 | struct nx842_devdata *new_devdata = NULL; | |
742 | struct device_node *of_node = NULL; | |
743 | struct property *status = NULL; | |
744 | struct property *maxsglen = NULL; | |
745 | struct property *maxsyncop = NULL; | |
746 | int ret = 0; | |
747 | unsigned long flags; | |
748 | ||
7f6e3aad DS |
749 | new_devdata = kzalloc(sizeof(*new_devdata), GFP_NOFS); |
750 | if (!new_devdata) | |
751 | return -ENOMEM; | |
752 | ||
0e16aafb SJ |
753 | spin_lock_irqsave(&devdata_mutex, flags); |
754 | old_devdata = rcu_dereference_check(devdata, | |
755 | lockdep_is_held(&devdata_mutex)); | |
756 | if (old_devdata) | |
757 | of_node = old_devdata->dev->of_node; | |
758 | ||
759 | if (!old_devdata || !of_node) { | |
760 | pr_err("%s: device is not available\n", __func__); | |
761 | spin_unlock_irqrestore(&devdata_mutex, flags); | |
7f6e3aad | 762 | kfree(new_devdata); |
0e16aafb SJ |
763 | return -ENODEV; |
764 | } | |
765 | ||
0e16aafb SJ |
766 | memcpy(new_devdata, old_devdata, sizeof(*old_devdata)); |
767 | new_devdata->counters = old_devdata->counters; | |
768 | ||
769 | /* Set ptrs for existing properties */ | |
770 | status = of_find_property(of_node, "status", NULL); | |
771 | maxsglen = of_find_property(of_node, "ibm,max-sg-len", NULL); | |
772 | maxsyncop = of_find_property(of_node, "ibm,max-sync-cop", NULL); | |
773 | if (!status || !maxsglen || !maxsyncop) { | |
774 | dev_err(old_devdata->dev, "%s: Could not locate device properties\n", __func__); | |
775 | ret = -EINVAL; | |
776 | goto error_out; | |
777 | } | |
778 | ||
259092a3 GL |
779 | /* |
780 | * If this is a property update, there are only certain properties that | |
781 | * we care about. Bail if it isn't in the below list | |
782 | */ | |
783 | if (new_prop && (strncmp(new_prop->name, "status", new_prop->length) || | |
784 | strncmp(new_prop->name, "ibm,max-sg-len", new_prop->length) || | |
785 | strncmp(new_prop->name, "ibm,max-sync-cop", new_prop->length))) | |
786 | goto out; | |
0e16aafb SJ |
787 | |
788 | /* Perform property updates */ | |
2a96726b | 789 | ret = nx842_OF_upd_status(new_devdata, status); |
0e16aafb SJ |
790 | if (ret) |
791 | goto error_out; | |
792 | ||
793 | ret = nx842_OF_upd_maxsglen(new_devdata, maxsglen); | |
794 | if (ret) | |
795 | goto error_out; | |
796 | ||
797 | ret = nx842_OF_upd_maxsyncop(new_devdata, maxsyncop); | |
798 | if (ret) | |
799 | goto error_out; | |
800 | ||
801 | out: | |
802 | dev_info(old_devdata->dev, "%s: max_sync_size new:%u old:%u\n", | |
803 | __func__, new_devdata->max_sync_size, | |
804 | old_devdata->max_sync_size); | |
805 | dev_info(old_devdata->dev, "%s: max_sync_sg new:%u old:%u\n", | |
806 | __func__, new_devdata->max_sync_sg, | |
807 | old_devdata->max_sync_sg); | |
808 | dev_info(old_devdata->dev, "%s: max_sg_len new:%u old:%u\n", | |
809 | __func__, new_devdata->max_sg_len, | |
810 | old_devdata->max_sg_len); | |
811 | ||
812 | rcu_assign_pointer(devdata, new_devdata); | |
813 | spin_unlock_irqrestore(&devdata_mutex, flags); | |
814 | synchronize_rcu(); | |
815 | dev_set_drvdata(new_devdata->dev, new_devdata); | |
816 | kfree(old_devdata); | |
817 | return 0; | |
818 | ||
819 | error_out: | |
820 | if (new_devdata) { | |
821 | dev_info(old_devdata->dev, "%s: device disabled\n", __func__); | |
822 | nx842_OF_set_defaults(new_devdata); | |
823 | rcu_assign_pointer(devdata, new_devdata); | |
824 | spin_unlock_irqrestore(&devdata_mutex, flags); | |
825 | synchronize_rcu(); | |
826 | dev_set_drvdata(new_devdata->dev, new_devdata); | |
827 | kfree(old_devdata); | |
828 | } else { | |
829 | dev_err(old_devdata->dev, "%s: could not update driver from hardware\n", __func__); | |
830 | spin_unlock_irqrestore(&devdata_mutex, flags); | |
831 | } | |
832 | ||
833 | if (!ret) | |
834 | ret = -EINVAL; | |
835 | return ret; | |
836 | } | |
837 | ||
838 | /** | |
839 | * nx842_OF_notifier - Process updates to OF properties for the device | |
840 | * | |
841 | * @np: notifier block | |
842 | * @action: notifier action | |
c215b513 | 843 | * @data: struct of_reconfig_data pointer |
0e16aafb SJ |
844 | * |
845 | * Returns: | |
846 | * NOTIFY_OK on success | |
847 | * NOTIFY_BAD encoded with error number on failure, use | |
848 | * notifier_to_errno() to decode this value | |
849 | */ | |
1cf3d8b3 | 850 | static int nx842_OF_notifier(struct notifier_block *np, unsigned long action, |
f5242e5a | 851 | void *data) |
0e16aafb | 852 | { |
f5242e5a | 853 | struct of_reconfig_data *upd = data; |
0e16aafb SJ |
854 | struct nx842_devdata *local_devdata; |
855 | struct device_node *node = NULL; | |
856 | ||
0e16aafb SJ |
857 | rcu_read_lock(); |
858 | local_devdata = rcu_dereference(devdata); | |
859 | if (local_devdata) | |
860 | node = local_devdata->dev->of_node; | |
861 | ||
862 | if (local_devdata && | |
1cf3d8b3 NF |
863 | action == OF_RECONFIG_UPDATE_PROPERTY && |
864 | !strcmp(upd->dn->name, node->name)) { | |
0e16aafb | 865 | rcu_read_unlock(); |
1cf3d8b3 | 866 | nx842_OF_upd(upd->prop); |
0e16aafb SJ |
867 | } else |
868 | rcu_read_unlock(); | |
869 | ||
870 | return NOTIFY_OK; | |
871 | } | |
872 | ||
873 | static struct notifier_block nx842_of_nb = { | |
874 | .notifier_call = nx842_OF_notifier, | |
875 | }; | |
876 | ||
877 | #define nx842_counter_read(_name) \ | |
878 | static ssize_t nx842_##_name##_show(struct device *dev, \ | |
879 | struct device_attribute *attr, \ | |
880 | char *buf) { \ | |
881 | struct nx842_devdata *local_devdata; \ | |
882 | int p = 0; \ | |
883 | rcu_read_lock(); \ | |
884 | local_devdata = rcu_dereference(devdata); \ | |
885 | if (local_devdata) \ | |
90fde663 | 886 | p = snprintf(buf, PAGE_SIZE, "%lld\n", \ |
2af7a0f9 | 887 | atomic64_read(&local_devdata->counters->_name)); \ |
0e16aafb SJ |
888 | rcu_read_unlock(); \ |
889 | return p; \ | |
890 | } | |
891 | ||
892 | #define NX842DEV_COUNTER_ATTR_RO(_name) \ | |
893 | nx842_counter_read(_name); \ | |
894 | static struct device_attribute dev_attr_##_name = __ATTR(_name, \ | |
895 | 0444, \ | |
896 | nx842_##_name##_show,\ | |
897 | NULL); | |
898 | ||
899 | NX842DEV_COUNTER_ATTR_RO(comp_complete); | |
900 | NX842DEV_COUNTER_ATTR_RO(comp_failed); | |
901 | NX842DEV_COUNTER_ATTR_RO(decomp_complete); | |
902 | NX842DEV_COUNTER_ATTR_RO(decomp_failed); | |
903 | NX842DEV_COUNTER_ATTR_RO(swdecomp); | |
904 | ||
905 | static ssize_t nx842_timehist_show(struct device *, | |
906 | struct device_attribute *, char *); | |
907 | ||
908 | static struct device_attribute dev_attr_comp_times = __ATTR(comp_times, 0444, | |
909 | nx842_timehist_show, NULL); | |
910 | static struct device_attribute dev_attr_decomp_times = __ATTR(decomp_times, | |
911 | 0444, nx842_timehist_show, NULL); | |
912 | ||
913 | static ssize_t nx842_timehist_show(struct device *dev, | |
914 | struct device_attribute *attr, char *buf) { | |
915 | char *p = buf; | |
916 | struct nx842_devdata *local_devdata; | |
917 | atomic64_t *times; | |
918 | int bytes_remain = PAGE_SIZE; | |
919 | int bytes; | |
920 | int i; | |
921 | ||
922 | rcu_read_lock(); | |
923 | local_devdata = rcu_dereference(devdata); | |
924 | if (!local_devdata) { | |
925 | rcu_read_unlock(); | |
926 | return 0; | |
927 | } | |
928 | ||
929 | if (attr == &dev_attr_comp_times) | |
930 | times = local_devdata->counters->comp_times; | |
931 | else if (attr == &dev_attr_decomp_times) | |
932 | times = local_devdata->counters->decomp_times; | |
933 | else { | |
934 | rcu_read_unlock(); | |
935 | return 0; | |
936 | } | |
937 | ||
938 | for (i = 0; i < (NX842_HIST_SLOTS - 2); i++) { | |
90fde663 | 939 | bytes = snprintf(p, bytes_remain, "%u-%uus:\t%lld\n", |
0e16aafb | 940 | i ? (2<<(i-1)) : 0, (2<<i)-1, |
2af7a0f9 | 941 | atomic64_read(×[i])); |
0e16aafb SJ |
942 | bytes_remain -= bytes; |
943 | p += bytes; | |
944 | } | |
945 | /* The last bucket holds everything over | |
946 | * 2<<(NX842_HIST_SLOTS - 2) us */ | |
90fde663 | 947 | bytes = snprintf(p, bytes_remain, "%uus - :\t%lld\n", |
0e16aafb | 948 | 2<<(NX842_HIST_SLOTS - 2), |
2af7a0f9 | 949 | atomic64_read(×[(NX842_HIST_SLOTS - 1)])); |
0e16aafb SJ |
950 | p += bytes; |
951 | ||
952 | rcu_read_unlock(); | |
953 | return p - buf; | |
954 | } | |
955 | ||
956 | static struct attribute *nx842_sysfs_entries[] = { | |
957 | &dev_attr_comp_complete.attr, | |
958 | &dev_attr_comp_failed.attr, | |
959 | &dev_attr_decomp_complete.attr, | |
960 | &dev_attr_decomp_failed.attr, | |
961 | &dev_attr_swdecomp.attr, | |
962 | &dev_attr_comp_times.attr, | |
963 | &dev_attr_decomp_times.attr, | |
964 | NULL, | |
965 | }; | |
966 | ||
bd75b4ef | 967 | static const struct attribute_group nx842_attribute_group = { |
0e16aafb SJ |
968 | .name = NULL, /* put in device directory */ |
969 | .attrs = nx842_sysfs_entries, | |
970 | }; | |
971 | ||
8c099490 HM |
972 | #define nxcop_caps_read(_name) \ |
973 | static ssize_t nxcop_##_name##_show(struct device *dev, \ | |
974 | struct device_attribute *attr, char *buf) \ | |
975 | { \ | |
976 | return sprintf(buf, "%lld\n", nx_cop_caps._name); \ | |
977 | } | |
978 | ||
979 | #define NXCT_ATTR_RO(_name) \ | |
980 | nxcop_caps_read(_name); \ | |
981 | static struct device_attribute dev_attr_##_name = __ATTR(_name, \ | |
982 | 0444, \ | |
983 | nxcop_##_name##_show, \ | |
984 | NULL); | |
985 | ||
986 | NXCT_ATTR_RO(req_max_processed_len); | |
987 | NXCT_ATTR_RO(min_compress_len); | |
988 | NXCT_ATTR_RO(min_decompress_len); | |
989 | ||
990 | static struct attribute *nxcop_caps_sysfs_entries[] = { | |
991 | &dev_attr_req_max_processed_len.attr, | |
992 | &dev_attr_min_compress_len.attr, | |
993 | &dev_attr_min_decompress_len.attr, | |
994 | NULL, | |
995 | }; | |
996 | ||
bd75b4ef | 997 | static const struct attribute_group nxcop_caps_attr_group = { |
8c099490 HM |
998 | .name = "nx_gzip_caps", |
999 | .attrs = nxcop_caps_sysfs_entries, | |
1000 | }; | |
1001 | ||
7011a122 | 1002 | static struct nx842_driver nx842_pseries_driver = { |
3e648cbe | 1003 | .name = KBUILD_MODNAME, |
7011a122 | 1004 | .owner = THIS_MODULE, |
2c6f6eab | 1005 | .workmem_size = sizeof(struct nx842_workmem), |
959e6659 | 1006 | .constraints = &nx842_pseries_constraints, |
7011a122 DS |
1007 | .compress = nx842_pseries_compress, |
1008 | .decompress = nx842_pseries_decompress, | |
1009 | }; | |
1010 | ||
03952d98 DS |
1011 | static int nx842_pseries_crypto_init(struct crypto_tfm *tfm) |
1012 | { | |
1013 | return nx842_crypto_init(tfm, &nx842_pseries_driver); | |
1014 | } | |
1015 | ||
1016 | static struct crypto_alg nx842_pseries_alg = { | |
1017 | .cra_name = "842", | |
1018 | .cra_driver_name = "842-nx", | |
1019 | .cra_priority = 300, | |
1020 | .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, | |
1021 | .cra_ctxsize = sizeof(struct nx842_crypto_ctx), | |
1022 | .cra_module = THIS_MODULE, | |
1023 | .cra_init = nx842_pseries_crypto_init, | |
1024 | .cra_exit = nx842_crypto_exit, | |
1025 | .cra_u = { .compress = { | |
1026 | .coa_compress = nx842_crypto_compress, | |
1027 | .coa_decompress = nx842_crypto_decompress } } | |
1028 | }; | |
1029 | ||
039af967 DS |
1030 | static int nx842_probe(struct vio_dev *viodev, |
1031 | const struct vio_device_id *id) | |
0e16aafb SJ |
1032 | { |
1033 | struct nx842_devdata *old_devdata, *new_devdata = NULL; | |
1034 | unsigned long flags; | |
1035 | int ret = 0; | |
1036 | ||
7f6e3aad DS |
1037 | new_devdata = kzalloc(sizeof(*new_devdata), GFP_NOFS); |
1038 | if (!new_devdata) | |
1039 | return -ENOMEM; | |
1040 | ||
1041 | new_devdata->counters = kzalloc(sizeof(*new_devdata->counters), | |
1042 | GFP_NOFS); | |
1043 | if (!new_devdata->counters) { | |
1044 | kfree(new_devdata); | |
1045 | return -ENOMEM; | |
1046 | } | |
1047 | ||
0e16aafb SJ |
1048 | spin_lock_irqsave(&devdata_mutex, flags); |
1049 | old_devdata = rcu_dereference_check(devdata, | |
1050 | lockdep_is_held(&devdata_mutex)); | |
1051 | ||
1052 | if (old_devdata && old_devdata->vdev != NULL) { | |
1053 | dev_err(&viodev->dev, "%s: Attempt to register more than one instance of the hardware\n", __func__); | |
1054 | ret = -1; | |
1055 | goto error_unlock; | |
1056 | } | |
1057 | ||
1058 | dev_set_drvdata(&viodev->dev, NULL); | |
1059 | ||
0e16aafb SJ |
1060 | new_devdata->vdev = viodev; |
1061 | new_devdata->dev = &viodev->dev; | |
1062 | nx842_OF_set_defaults(new_devdata); | |
1063 | ||
1064 | rcu_assign_pointer(devdata, new_devdata); | |
1065 | spin_unlock_irqrestore(&devdata_mutex, flags); | |
1066 | synchronize_rcu(); | |
1067 | kfree(old_devdata); | |
1068 | ||
1cf3d8b3 | 1069 | of_reconfig_notifier_register(&nx842_of_nb); |
0e16aafb SJ |
1070 | |
1071 | ret = nx842_OF_upd(NULL); | |
ee781b7f | 1072 | if (ret) |
0e16aafb | 1073 | goto error; |
0e16aafb | 1074 | |
03952d98 DS |
1075 | ret = crypto_register_alg(&nx842_pseries_alg); |
1076 | if (ret) { | |
1077 | dev_err(&viodev->dev, "could not register comp alg: %d\n", ret); | |
1078 | goto error; | |
1079 | } | |
1080 | ||
0e16aafb | 1081 | rcu_read_lock(); |
cda43576 | 1082 | dev_set_drvdata(&viodev->dev, rcu_dereference(devdata)); |
0e16aafb SJ |
1083 | rcu_read_unlock(); |
1084 | ||
1085 | if (sysfs_create_group(&viodev->dev.kobj, &nx842_attribute_group)) { | |
1086 | dev_err(&viodev->dev, "could not create sysfs device attributes\n"); | |
1087 | ret = -1; | |
1088 | goto error; | |
1089 | } | |
1090 | ||
8c099490 HM |
1091 | if (caps_feat) { |
1092 | if (sysfs_create_group(&viodev->dev.kobj, | |
1093 | &nxcop_caps_attr_group)) { | |
1094 | dev_err(&viodev->dev, | |
1095 | "Could not create sysfs NX capability entries\n"); | |
1096 | ret = -1; | |
1097 | goto error; | |
1098 | } | |
1099 | } | |
1100 | ||
0e16aafb SJ |
1101 | return 0; |
1102 | ||
1103 | error_unlock: | |
1104 | spin_unlock_irqrestore(&devdata_mutex, flags); | |
1105 | if (new_devdata) | |
1106 | kfree(new_devdata->counters); | |
1107 | kfree(new_devdata); | |
1108 | error: | |
1109 | return ret; | |
1110 | } | |
1111 | ||
386a966f | 1112 | static void nx842_remove(struct vio_dev *viodev) |
0e16aafb SJ |
1113 | { |
1114 | struct nx842_devdata *old_devdata; | |
1115 | unsigned long flags; | |
1116 | ||
1117 | pr_info("Removing IBM Power 842 compression device\n"); | |
1118 | sysfs_remove_group(&viodev->dev.kobj, &nx842_attribute_group); | |
1119 | ||
8c099490 HM |
1120 | if (caps_feat) |
1121 | sysfs_remove_group(&viodev->dev.kobj, &nxcop_caps_attr_group); | |
1122 | ||
03952d98 DS |
1123 | crypto_unregister_alg(&nx842_pseries_alg); |
1124 | ||
0e16aafb SJ |
1125 | spin_lock_irqsave(&devdata_mutex, flags); |
1126 | old_devdata = rcu_dereference_check(devdata, | |
1127 | lockdep_is_held(&devdata_mutex)); | |
1cf3d8b3 | 1128 | of_reconfig_notifier_unregister(&nx842_of_nb); |
7ded6e3d | 1129 | RCU_INIT_POINTER(devdata, NULL); |
0e16aafb SJ |
1130 | spin_unlock_irqrestore(&devdata_mutex, flags); |
1131 | synchronize_rcu(); | |
1132 | dev_set_drvdata(&viodev->dev, NULL); | |
1133 | if (old_devdata) | |
1134 | kfree(old_devdata->counters); | |
1135 | kfree(old_devdata); | |
0e16aafb SJ |
1136 | } |
1137 | ||
b4ba2211 HM |
1138 | /* |
1139 | * Get NX capabilities from the hypervisor. | |
1140 | * Only NXGZIP capabilities are provided by the hypersvisor right | |
1141 | * now and these values are available to user space with sysfs. | |
1142 | */ | |
1143 | static void __init nxcop_get_capabilities(void) | |
1144 | { | |
1145 | struct hv_vas_all_caps *hv_caps; | |
1146 | struct hv_nx_cop_caps *hv_nxc; | |
1147 | int rc; | |
1148 | ||
1149 | hv_caps = kmalloc(sizeof(*hv_caps), GFP_KERNEL); | |
1150 | if (!hv_caps) | |
1151 | return; | |
1152 | /* | |
1153 | * Get NX overall capabilities with feature type=0 | |
1154 | */ | |
1155 | rc = h_query_vas_capabilities(H_QUERY_NX_CAPABILITIES, 0, | |
1156 | (u64)virt_to_phys(hv_caps)); | |
1157 | if (rc) | |
1158 | goto out; | |
1159 | ||
1160 | caps_feat = be64_to_cpu(hv_caps->feat_type); | |
1161 | /* | |
1162 | * NX-GZIP feature available | |
1163 | */ | |
1164 | if (caps_feat & VAS_NX_GZIP_FEAT_BIT) { | |
1165 | hv_nxc = kmalloc(sizeof(*hv_nxc), GFP_KERNEL); | |
1166 | if (!hv_nxc) | |
1167 | goto out; | |
1168 | /* | |
1169 | * Get capabilities for NX-GZIP feature | |
1170 | */ | |
1171 | rc = h_query_vas_capabilities(H_QUERY_NX_CAPABILITIES, | |
1172 | VAS_NX_GZIP_FEAT, | |
1173 | (u64)virt_to_phys(hv_nxc)); | |
1174 | } else { | |
1175 | pr_err("NX-GZIP feature is not available\n"); | |
1176 | rc = -EINVAL; | |
1177 | } | |
1178 | ||
1179 | if (!rc) { | |
1180 | nx_cop_caps.descriptor = be64_to_cpu(hv_nxc->descriptor); | |
1181 | nx_cop_caps.req_max_processed_len = | |
1182 | be64_to_cpu(hv_nxc->req_max_processed_len); | |
1183 | nx_cop_caps.min_compress_len = | |
1184 | be64_to_cpu(hv_nxc->min_compress_len); | |
1185 | nx_cop_caps.min_decompress_len = | |
1186 | be64_to_cpu(hv_nxc->min_decompress_len); | |
1187 | } else { | |
1188 | caps_feat = 0; | |
1189 | } | |
1190 | ||
1191 | kfree(hv_nxc); | |
1192 | out: | |
1193 | kfree(hv_caps); | |
1194 | } | |
1195 | ||
f096ced9 | 1196 | static const struct vio_device_id nx842_vio_driver_ids[] = { |
3e648cbe | 1197 | {"ibm,compression-v1", "ibm,compression"}, |
0e16aafb SJ |
1198 | {"", ""}, |
1199 | }; | |
06676aa1 | 1200 | MODULE_DEVICE_TABLE(vio, nx842_vio_driver_ids); |
0e16aafb | 1201 | |
b8e04187 | 1202 | static struct vio_driver nx842_vio_driver = { |
3e648cbe | 1203 | .name = KBUILD_MODNAME, |
0e16aafb | 1204 | .probe = nx842_probe, |
039af967 | 1205 | .remove = nx842_remove, |
0e16aafb | 1206 | .get_desired_dma = nx842_get_desired_dma, |
b8e04187 | 1207 | .id_table = nx842_vio_driver_ids, |
0e16aafb SJ |
1208 | }; |
1209 | ||
ec13bcbe | 1210 | static int __init nx842_pseries_init(void) |
0e16aafb SJ |
1211 | { |
1212 | struct nx842_devdata *new_devdata; | |
8ccc9cc4 | 1213 | struct device_node *np; |
3e648cbe DS |
1214 | int ret; |
1215 | ||
8ccc9cc4 LH |
1216 | np = of_find_compatible_node(NULL, NULL, "ibm,compression"); |
1217 | if (!np) | |
3e648cbe | 1218 | return -ENODEV; |
8ccc9cc4 | 1219 | of_node_put(np); |
3e648cbe | 1220 | |
0e16aafb SJ |
1221 | RCU_INIT_POINTER(devdata, NULL); |
1222 | new_devdata = kzalloc(sizeof(*new_devdata), GFP_KERNEL); | |
8c48db9a | 1223 | if (!new_devdata) |
0e16aafb | 1224 | return -ENOMEM; |
8c48db9a | 1225 | |
0e16aafb | 1226 | RCU_INIT_POINTER(devdata, new_devdata); |
b4ba2211 HM |
1227 | /* |
1228 | * Get NX capabilities from the hypervisor. | |
1229 | */ | |
1230 | nxcop_get_capabilities(); | |
0e16aafb | 1231 | |
3e648cbe DS |
1232 | ret = vio_register_driver(&nx842_vio_driver); |
1233 | if (ret) { | |
1234 | pr_err("Could not register VIO driver %d\n", ret); | |
1235 | ||
1236 | kfree(new_devdata); | |
1237 | return ret; | |
1238 | } | |
1239 | ||
99cd49bb HM |
1240 | ret = vas_register_api_pseries(THIS_MODULE, VAS_COP_TYPE_GZIP, |
1241 | "nx-gzip"); | |
1242 | ||
1243 | if (ret) | |
1244 | pr_err("NX-GZIP is not supported. Returned=%d\n", ret); | |
1245 | ||
3e648cbe | 1246 | return 0; |
0e16aafb SJ |
1247 | } |
1248 | ||
ec13bcbe | 1249 | module_init(nx842_pseries_init); |
0e16aafb | 1250 | |
ec13bcbe | 1251 | static void __exit nx842_pseries_exit(void) |
0e16aafb SJ |
1252 | { |
1253 | struct nx842_devdata *old_devdata; | |
1254 | unsigned long flags; | |
1255 | ||
99cd49bb HM |
1256 | vas_unregister_api_pseries(); |
1257 | ||
03952d98 DS |
1258 | crypto_unregister_alg(&nx842_pseries_alg); |
1259 | ||
0e16aafb SJ |
1260 | spin_lock_irqsave(&devdata_mutex, flags); |
1261 | old_devdata = rcu_dereference_check(devdata, | |
1262 | lockdep_is_held(&devdata_mutex)); | |
7ded6e3d | 1263 | RCU_INIT_POINTER(devdata, NULL); |
0e16aafb SJ |
1264 | spin_unlock_irqrestore(&devdata_mutex, flags); |
1265 | synchronize_rcu(); | |
b8e04187 | 1266 | if (old_devdata && old_devdata->dev) |
0e16aafb SJ |
1267 | dev_set_drvdata(old_devdata->dev, NULL); |
1268 | kfree(old_devdata); | |
b8e04187 | 1269 | vio_unregister_driver(&nx842_vio_driver); |
0e16aafb SJ |
1270 | } |
1271 | ||
ec13bcbe | 1272 | module_exit(nx842_pseries_exit); |
0e16aafb | 1273 |