Seth Jennings | 0e16aaf | 2012-07-19 09:42:40 -0500 | [diff] [blame] | 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 | |
Seth Jennings | 0e16aaf | 2012-07-19 09:42:40 -0500 | [diff] [blame] | 24 | #include <linux/kernel.h> |
Michael Ellerman | 33b58b01 | 2012-08-03 12:23:15 +1000 | [diff] [blame] | 25 | #include <linux/module.h> |
| 26 | #include <linux/nx842.h> |
| 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> |
Seth Jennings | 0e16aaf | 2012-07-19 09:42:40 -0500 | [diff] [blame] | 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 { |
Michael Ellerman | 33b58b01 | 2012-08-03 12:23:15 +1000 | [diff] [blame] | 145 | unsigned long ptr; /* Real address (use __pa()) */ |
Seth Jennings | 0e16aaf | 2012-07-19 09:42:40 -0500 | [diff] [blame] | 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) { |
Michael Ellerman | 33b58b01 | 2012-08-03 12:23:15 +1000 | [diff] [blame] | 172 | entry->ptr = __pa(buf); |
Seth Jennings | 0e16aaf | 2012-07-19 09:42:40 -0500 | [diff] [blame] | 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)); |
Michael Ellerman | 33b58b01 | 2012-08-03 12:23:15 +1000 | [diff] [blame] | 374 | op.csbcpb = __pa(csbcpb); |
| 375 | op.out = __pa(slout.entries); |
Seth Jennings | 0e16aaf | 2012-07-19 09:42:40 -0500 | [diff] [blame] | 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 */ |
Michael Ellerman | 33b58b01 | 2012-08-03 12:23:15 +1000 | [diff] [blame] | 405 | op.in = __pa(inbuf); |
Seth Jennings | 0e16aaf | 2012-07-19 09:42:40 -0500 | [diff] [blame] | 406 | op.inlen = max_sync_size; |
| 407 | |
| 408 | } else { |
| 409 | /* Create indirect DDE (scatterlist) */ |
| 410 | nx842_build_scatterlist(inbuf, max_sync_size, &slin); |
Michael Ellerman | 33b58b01 | 2012-08-03 12:23:15 +1000 | [diff] [blame] | 411 | op.in = __pa(slin.entries); |
Seth Jennings | 0e16aaf | 2012-07-19 09:42:40 -0500 | [diff] [blame] | 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)); |
Michael Ellerman | 33b58b01 | 2012-08-03 12:23:15 +1000 | [diff] [blame] | 569 | op.csbcpb = __pa(csbcpb); |
Seth Jennings | 0e16aaf | 2012-07-19 09:42:40 -0500 | [diff] [blame] | 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 */ |
Michael Ellerman | 33b58b01 | 2012-08-03 12:23:15 +1000 | [diff] [blame] | 601 | op.in = __pa(inbuf); |
Seth Jennings | 0e16aaf | 2012-07-19 09:42:40 -0500 | [diff] [blame] | 602 | op.inlen = hdr->sizes[i]; |
| 603 | } else { |
| 604 | /* Create indirect DDE (scatterlist) */ |
| 605 | nx842_build_scatterlist(inbuf, hdr->sizes[i] , &slin); |
Michael Ellerman | 33b58b01 | 2012-08-03 12:23:15 +1000 | [diff] [blame] | 606 | op.in = __pa(slin.entries); |
Seth Jennings | 0e16aaf | 2012-07-19 09:42:40 -0500 | [diff] [blame] | 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 */ |
Michael Ellerman | 33b58b01 | 2012-08-03 12:23:15 +1000 | [diff] [blame] | 617 | op.out = __pa(outbuf); |
Seth Jennings | 0e16aaf | 2012-07-19 09:42:40 -0500 | [diff] [blame] | 618 | op.outlen = max_sync_size; |
| 619 | } else { |
| 620 | /* Create indirect DDE (scatterlist) */ |
| 621 | nx842_build_scatterlist(outbuf, max_sync_size, &slout); |
Michael Ellerman | 33b58b01 | 2012-08-03 12:23:15 +1000 | [diff] [blame] | 622 | op.out = __pa(slout.entries); |
Seth Jennings | 0e16aaf | 2012-07-19 09:42:40 -0500 | [diff] [blame] | 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 | } |