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Merge tag 'iio-for-3.20a_take2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / drivers / scsi / megaraid / megaraid_sas_fp.c
1 /*
2 * Linux MegaRAID driver for SAS based RAID controllers
3 *
4 * Copyright (c) 2009-2013 LSI Corporation
5 * Copyright (c) 2013-2014 Avago Technologies
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 *
20 * FILE: megaraid_sas_fp.c
21 *
22 * Authors: Avago Technologies
23 * Sumant Patro
24 * Varad Talamacki
25 * Manoj Jose
26 * Kashyap Desai <kashyap.desai@avagotech.com>
27 * Sumit Saxena <sumit.saxena@avagotech.com>
28 *
29 * Send feedback to: megaraidlinux.pdl@avagotech.com
30 *
31 * Mail to: Avago Technologies, 350 West Trimble Road, Building 90,
32 * San Jose, California 95131
33 */
34
35 #include <linux/kernel.h>
36 #include <linux/types.h>
37 #include <linux/pci.h>
38 #include <linux/list.h>
39 #include <linux/moduleparam.h>
40 #include <linux/module.h>
41 #include <linux/spinlock.h>
42 #include <linux/interrupt.h>
43 #include <linux/delay.h>
44 #include <linux/uio.h>
45 #include <linux/uaccess.h>
46 #include <linux/fs.h>
47 #include <linux/compat.h>
48 #include <linux/blkdev.h>
49 #include <linux/poll.h>
50
51 #include <scsi/scsi.h>
52 #include <scsi/scsi_cmnd.h>
53 #include <scsi/scsi_device.h>
54 #include <scsi/scsi_host.h>
55
56 #include "megaraid_sas_fusion.h"
57 #include "megaraid_sas.h"
58 #include <asm/div64.h>
59
60 #define LB_PENDING_CMDS_DEFAULT 4
61 static unsigned int lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
62 module_param(lb_pending_cmds, int, S_IRUGO);
63 MODULE_PARM_DESC(lb_pending_cmds, "Change raid-1 load balancing outstanding "
64 "threshold. Valid Values are 1-128. Default: 4");
65
66
67 #define ABS_DIFF(a, b) (((a) > (b)) ? ((a) - (b)) : ((b) - (a)))
68 #define MR_LD_STATE_OPTIMAL 3
69 #define FALSE 0
70 #define TRUE 1
71
72 #define SPAN_DEBUG 0
73 #define SPAN_ROW_SIZE(map, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowSize)
74 #define SPAN_ROW_DATA_SIZE(map_, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowDataSize)
75 #define SPAN_INVALID 0xff
76
77 /* Prototypes */
78 static void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
79 PLD_SPAN_INFO ldSpanInfo);
80 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
81 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
82 struct RAID_CONTEXT *pRAID_Context, struct MR_DRV_RAID_MAP_ALL *map);
83 static u64 get_row_from_strip(struct megasas_instance *instance, u32 ld,
84 u64 strip, struct MR_DRV_RAID_MAP_ALL *map);
85
86 u32 mega_mod64(u64 dividend, u32 divisor)
87 {
88 u64 d;
89 u32 remainder;
90
91 if (!divisor)
92 printk(KERN_ERR "megasas : DIVISOR is zero, in div fn\n");
93 d = dividend;
94 remainder = do_div(d, divisor);
95 return remainder;
96 }
97
98 /**
99 * @param dividend : Dividend
100 * @param divisor : Divisor
101 *
102 * @return quotient
103 **/
104 u64 mega_div64_32(uint64_t dividend, uint32_t divisor)
105 {
106 u32 remainder;
107 u64 d;
108
109 if (!divisor)
110 printk(KERN_ERR "megasas : DIVISOR is zero in mod fn\n");
111
112 d = dividend;
113 remainder = do_div(d, divisor);
114
115 return d;
116 }
117
118 struct MR_LD_RAID *MR_LdRaidGet(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
119 {
120 return &map->raidMap.ldSpanMap[ld].ldRaid;
121 }
122
123 static struct MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld,
124 struct MR_DRV_RAID_MAP_ALL
125 *map)
126 {
127 return &map->raidMap.ldSpanMap[ld].spanBlock[0];
128 }
129
130 static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, struct MR_DRV_RAID_MAP_ALL *map)
131 {
132 return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx];
133 }
134
135 u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_DRV_RAID_MAP_ALL *map)
136 {
137 return le16_to_cpu(map->raidMap.arMapInfo[ar].pd[arm]);
138 }
139
140 u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_DRV_RAID_MAP_ALL *map)
141 {
142 return le16_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef);
143 }
144
145 u16 MR_PdDevHandleGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
146 {
147 return map->raidMap.devHndlInfo[pd].curDevHdl;
148 }
149
150 u16 MR_GetLDTgtId(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
151 {
152 return le16_to_cpu(map->raidMap.ldSpanMap[ld].ldRaid.targetId);
153 }
154
155 u8 MR_TargetIdToLdGet(u32 ldTgtId, struct MR_DRV_RAID_MAP_ALL *map)
156 {
157 return map->raidMap.ldTgtIdToLd[ldTgtId];
158 }
159
160 static struct MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span,
161 struct MR_DRV_RAID_MAP_ALL *map)
162 {
163 return &map->raidMap.ldSpanMap[ld].spanBlock[span].span;
164 }
165
166 /*
167 * This function will Populate Driver Map using firmware raid map
168 */
169 void MR_PopulateDrvRaidMap(struct megasas_instance *instance)
170 {
171 struct fusion_context *fusion = instance->ctrl_context;
172 struct MR_FW_RAID_MAP_ALL *fw_map_old = NULL;
173 struct MR_FW_RAID_MAP *pFwRaidMap = NULL;
174 int i;
175
176
177 struct MR_DRV_RAID_MAP_ALL *drv_map =
178 fusion->ld_drv_map[(instance->map_id & 1)];
179 struct MR_DRV_RAID_MAP *pDrvRaidMap = &drv_map->raidMap;
180
181 if (instance->supportmax256vd) {
182 memcpy(fusion->ld_drv_map[instance->map_id & 1],
183 fusion->ld_map[instance->map_id & 1],
184 fusion->current_map_sz);
185 /* New Raid map will not set totalSize, so keep expected value
186 * for legacy code in ValidateMapInfo
187 */
188 pDrvRaidMap->totalSize =
189 cpu_to_le32(sizeof(struct MR_FW_RAID_MAP_EXT));
190 } else {
191 fw_map_old = (struct MR_FW_RAID_MAP_ALL *)
192 fusion->ld_map[(instance->map_id & 1)];
193 pFwRaidMap = &fw_map_old->raidMap;
194
195 #if VD_EXT_DEBUG
196 for (i = 0; i < le16_to_cpu(pFwRaidMap->ldCount); i++) {
197 dev_dbg(&instance->pdev->dev, "(%d) :Index 0x%x "
198 "Target Id 0x%x Seq Num 0x%x Size 0/%llx\n",
199 instance->unique_id, i,
200 fw_map_old->raidMap.ldSpanMap[i].ldRaid.targetId,
201 fw_map_old->raidMap.ldSpanMap[i].ldRaid.seqNum,
202 fw_map_old->raidMap.ldSpanMap[i].ldRaid.size);
203 }
204 #endif
205
206 memset(drv_map, 0, fusion->drv_map_sz);
207 pDrvRaidMap->totalSize = pFwRaidMap->totalSize;
208 pDrvRaidMap->ldCount = (__le16)pFwRaidMap->ldCount;
209 pDrvRaidMap->fpPdIoTimeoutSec = pFwRaidMap->fpPdIoTimeoutSec;
210 for (i = 0; i < MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS; i++)
211 pDrvRaidMap->ldTgtIdToLd[i] =
212 (u8)pFwRaidMap->ldTgtIdToLd[i];
213 for (i = 0; i < le16_to_cpu(pDrvRaidMap->ldCount); i++) {
214 pDrvRaidMap->ldSpanMap[i] = pFwRaidMap->ldSpanMap[i];
215 #if VD_EXT_DEBUG
216 dev_dbg(&instance->pdev->dev,
217 "pFwRaidMap->ldSpanMap[%d].ldRaid.targetId 0x%x "
218 "pFwRaidMap->ldSpanMap[%d].ldRaid.seqNum 0x%x "
219 "size 0x%x\n", i, i,
220 pFwRaidMap->ldSpanMap[i].ldRaid.targetId,
221 pFwRaidMap->ldSpanMap[i].ldRaid.seqNum,
222 (u32)pFwRaidMap->ldSpanMap[i].ldRaid.rowSize);
223 dev_dbg(&instance->pdev->dev,
224 "pDrvRaidMap->ldSpanMap[%d].ldRaid.targetId 0x%x "
225 "pDrvRaidMap->ldSpanMap[%d].ldRaid.seqNum 0x%x "
226 "size 0x%x\n", i, i,
227 pDrvRaidMap->ldSpanMap[i].ldRaid.targetId,
228 pDrvRaidMap->ldSpanMap[i].ldRaid.seqNum,
229 (u32)pDrvRaidMap->ldSpanMap[i].ldRaid.rowSize);
230 dev_dbg(&instance->pdev->dev, "Driver raid map all %p "
231 "raid map %p LD RAID MAP %p/%p\n", drv_map,
232 pDrvRaidMap, &pFwRaidMap->ldSpanMap[i].ldRaid,
233 &pDrvRaidMap->ldSpanMap[i].ldRaid);
234 #endif
235 }
236 memcpy(pDrvRaidMap->arMapInfo, pFwRaidMap->arMapInfo,
237 sizeof(struct MR_ARRAY_INFO) * MAX_RAIDMAP_ARRAYS);
238 memcpy(pDrvRaidMap->devHndlInfo, pFwRaidMap->devHndlInfo,
239 sizeof(struct MR_DEV_HANDLE_INFO) *
240 MAX_RAIDMAP_PHYSICAL_DEVICES);
241 }
242 }
243
244 /*
245 * This function will validate Map info data provided by FW
246 */
247 u8 MR_ValidateMapInfo(struct megasas_instance *instance)
248 {
249 struct fusion_context *fusion;
250 struct MR_DRV_RAID_MAP_ALL *drv_map;
251 struct MR_DRV_RAID_MAP *pDrvRaidMap;
252 struct LD_LOAD_BALANCE_INFO *lbInfo;
253 PLD_SPAN_INFO ldSpanInfo;
254 struct MR_LD_RAID *raid;
255 int ldCount, num_lds;
256 u16 ld;
257 u32 expected_size;
258
259
260 MR_PopulateDrvRaidMap(instance);
261
262 fusion = instance->ctrl_context;
263 drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
264 pDrvRaidMap = &drv_map->raidMap;
265
266 lbInfo = fusion->load_balance_info;
267 ldSpanInfo = fusion->log_to_span;
268
269 if (instance->supportmax256vd)
270 expected_size = sizeof(struct MR_FW_RAID_MAP_EXT);
271 else
272 expected_size =
273 (sizeof(struct MR_FW_RAID_MAP) - sizeof(struct MR_LD_SPAN_MAP) +
274 (sizeof(struct MR_LD_SPAN_MAP) * le16_to_cpu(pDrvRaidMap->ldCount)));
275
276 if (le32_to_cpu(pDrvRaidMap->totalSize) != expected_size) {
277 dev_err(&instance->pdev->dev, "map info structure size 0x%x is not matching with ld count\n",
278 (unsigned int) expected_size);
279 dev_err(&instance->pdev->dev, "megasas: span map %x, pDrvRaidMap->totalSize : %x\n",
280 (unsigned int)sizeof(struct MR_LD_SPAN_MAP),
281 le32_to_cpu(pDrvRaidMap->totalSize));
282 return 0;
283 }
284
285 if (instance->UnevenSpanSupport)
286 mr_update_span_set(drv_map, ldSpanInfo);
287
288 mr_update_load_balance_params(drv_map, lbInfo);
289
290 num_lds = le16_to_cpu(drv_map->raidMap.ldCount);
291
292 /*Convert Raid capability values to CPU arch */
293 for (ldCount = 0; ldCount < num_lds; ldCount++) {
294 ld = MR_TargetIdToLdGet(ldCount, drv_map);
295 raid = MR_LdRaidGet(ld, drv_map);
296 le32_to_cpus((u32 *)&raid->capability);
297 }
298
299 return 1;
300 }
301
302 u32 MR_GetSpanBlock(u32 ld, u64 row, u64 *span_blk,
303 struct MR_DRV_RAID_MAP_ALL *map)
304 {
305 struct MR_SPAN_BLOCK_INFO *pSpanBlock = MR_LdSpanInfoGet(ld, map);
306 struct MR_QUAD_ELEMENT *quad;
307 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
308 u32 span, j;
309
310 for (span = 0; span < raid->spanDepth; span++, pSpanBlock++) {
311
312 for (j = 0; j < le32_to_cpu(pSpanBlock->block_span_info.noElements); j++) {
313 quad = &pSpanBlock->block_span_info.quad[j];
314
315 if (le32_to_cpu(quad->diff) == 0)
316 return SPAN_INVALID;
317 if (le64_to_cpu(quad->logStart) <= row && row <=
318 le64_to_cpu(quad->logEnd) && (mega_mod64(row - le64_to_cpu(quad->logStart),
319 le32_to_cpu(quad->diff))) == 0) {
320 if (span_blk != NULL) {
321 u64 blk, debugBlk;
322 blk = mega_div64_32((row-le64_to_cpu(quad->logStart)), le32_to_cpu(quad->diff));
323 debugBlk = blk;
324
325 blk = (blk + le64_to_cpu(quad->offsetInSpan)) << raid->stripeShift;
326 *span_blk = blk;
327 }
328 return span;
329 }
330 }
331 }
332 return SPAN_INVALID;
333 }
334
335 /*
336 ******************************************************************************
337 *
338 * Function to print info about span set created in driver from FW raid map
339 *
340 * Inputs :
341 * map - LD map
342 * ldSpanInfo - ldSpanInfo per HBA instance
343 */
344 #if SPAN_DEBUG
345 static int getSpanInfo(struct MR_DRV_RAID_MAP_ALL *map,
346 PLD_SPAN_INFO ldSpanInfo)
347 {
348
349 u8 span;
350 u32 element;
351 struct MR_LD_RAID *raid;
352 LD_SPAN_SET *span_set;
353 struct MR_QUAD_ELEMENT *quad;
354 int ldCount;
355 u16 ld;
356
357 for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
358 ld = MR_TargetIdToLdGet(ldCount, map);
359 if (ld >= MAX_LOGICAL_DRIVES_EXT)
360 continue;
361 raid = MR_LdRaidGet(ld, map);
362 dev_dbg(&instance->pdev->dev, "LD %x: span_depth=%x\n",
363 ld, raid->spanDepth);
364 for (span = 0; span < raid->spanDepth; span++)
365 dev_dbg(&instance->pdev->dev, "Span=%x,"
366 " number of quads=%x\n", span,
367 le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
368 block_span_info.noElements));
369 for (element = 0; element < MAX_QUAD_DEPTH; element++) {
370 span_set = &(ldSpanInfo[ld].span_set[element]);
371 if (span_set->span_row_data_width == 0)
372 break;
373
374 dev_dbg(&instance->pdev->dev, "Span Set %x:"
375 "width=%x, diff=%x\n", element,
376 (unsigned int)span_set->span_row_data_width,
377 (unsigned int)span_set->diff);
378 dev_dbg(&instance->pdev->dev, "logical LBA"
379 "start=0x%08lx, end=0x%08lx\n",
380 (long unsigned int)span_set->log_start_lba,
381 (long unsigned int)span_set->log_end_lba);
382 dev_dbg(&instance->pdev->dev, "span row start=0x%08lx,"
383 " end=0x%08lx\n",
384 (long unsigned int)span_set->span_row_start,
385 (long unsigned int)span_set->span_row_end);
386 dev_dbg(&instance->pdev->dev, "data row start=0x%08lx,"
387 " end=0x%08lx\n",
388 (long unsigned int)span_set->data_row_start,
389 (long unsigned int)span_set->data_row_end);
390 dev_dbg(&instance->pdev->dev, "data strip start=0x%08lx,"
391 " end=0x%08lx\n",
392 (long unsigned int)span_set->data_strip_start,
393 (long unsigned int)span_set->data_strip_end);
394
395 for (span = 0; span < raid->spanDepth; span++) {
396 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
397 block_span_info.noElements) >=
398 element + 1) {
399 quad = &map->raidMap.ldSpanMap[ld].
400 spanBlock[span].block_span_info.
401 quad[element];
402 dev_dbg(&instance->pdev->dev, "Span=%x,"
403 "Quad=%x, diff=%x\n", span,
404 element, le32_to_cpu(quad->diff));
405 dev_dbg(&instance->pdev->dev,
406 "offset_in_span=0x%08lx\n",
407 (long unsigned int)le64_to_cpu(quad->offsetInSpan));
408 dev_dbg(&instance->pdev->dev,
409 "logical start=0x%08lx, end=0x%08lx\n",
410 (long unsigned int)le64_to_cpu(quad->logStart),
411 (long unsigned int)le64_to_cpu(quad->logEnd));
412 }
413 }
414 }
415 }
416 return 0;
417 }
418 #endif
419
420 /*
421 ******************************************************************************
422 *
423 * This routine calculates the Span block for given row using spanset.
424 *
425 * Inputs :
426 * instance - HBA instance
427 * ld - Logical drive number
428 * row - Row number
429 * map - LD map
430 *
431 * Outputs :
432 *
433 * span - Span number
434 * block - Absolute Block number in the physical disk
435 * div_error - Devide error code.
436 */
437
438 u32 mr_spanset_get_span_block(struct megasas_instance *instance,
439 u32 ld, u64 row, u64 *span_blk, struct MR_DRV_RAID_MAP_ALL *map)
440 {
441 struct fusion_context *fusion = instance->ctrl_context;
442 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
443 LD_SPAN_SET *span_set;
444 struct MR_QUAD_ELEMENT *quad;
445 u32 span, info;
446 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
447
448 for (info = 0; info < MAX_QUAD_DEPTH; info++) {
449 span_set = &(ldSpanInfo[ld].span_set[info]);
450
451 if (span_set->span_row_data_width == 0)
452 break;
453
454 if (row > span_set->data_row_end)
455 continue;
456
457 for (span = 0; span < raid->spanDepth; span++)
458 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
459 block_span_info.noElements) >= info+1) {
460 quad = &map->raidMap.ldSpanMap[ld].
461 spanBlock[span].
462 block_span_info.quad[info];
463 if (le32_to_cpu(quad->diff) == 0)
464 return SPAN_INVALID;
465 if (le64_to_cpu(quad->logStart) <= row &&
466 row <= le64_to_cpu(quad->logEnd) &&
467 (mega_mod64(row - le64_to_cpu(quad->logStart),
468 le32_to_cpu(quad->diff))) == 0) {
469 if (span_blk != NULL) {
470 u64 blk;
471 blk = mega_div64_32
472 ((row - le64_to_cpu(quad->logStart)),
473 le32_to_cpu(quad->diff));
474 blk = (blk + le64_to_cpu(quad->offsetInSpan))
475 << raid->stripeShift;
476 *span_blk = blk;
477 }
478 return span;
479 }
480 }
481 }
482 return SPAN_INVALID;
483 }
484
485 /*
486 ******************************************************************************
487 *
488 * This routine calculates the row for given strip using spanset.
489 *
490 * Inputs :
491 * instance - HBA instance
492 * ld - Logical drive number
493 * Strip - Strip
494 * map - LD map
495 *
496 * Outputs :
497 *
498 * row - row associated with strip
499 */
500
501 static u64 get_row_from_strip(struct megasas_instance *instance,
502 u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
503 {
504 struct fusion_context *fusion = instance->ctrl_context;
505 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
506 LD_SPAN_SET *span_set;
507 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
508 u32 info, strip_offset, span, span_offset;
509 u64 span_set_Strip, span_set_Row, retval;
510
511 for (info = 0; info < MAX_QUAD_DEPTH; info++) {
512 span_set = &(ldSpanInfo[ld].span_set[info]);
513
514 if (span_set->span_row_data_width == 0)
515 break;
516 if (strip > span_set->data_strip_end)
517 continue;
518
519 span_set_Strip = strip - span_set->data_strip_start;
520 strip_offset = mega_mod64(span_set_Strip,
521 span_set->span_row_data_width);
522 span_set_Row = mega_div64_32(span_set_Strip,
523 span_set->span_row_data_width) * span_set->diff;
524 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
525 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
526 block_span_info.noElements) >= info+1) {
527 if (strip_offset >=
528 span_set->strip_offset[span])
529 span_offset++;
530 else
531 break;
532 }
533 #if SPAN_DEBUG
534 dev_info(&instance->pdev->dev, "Strip 0x%llx,"
535 "span_set_Strip 0x%llx, span_set_Row 0x%llx"
536 "data width 0x%llx span offset 0x%x\n", strip,
537 (unsigned long long)span_set_Strip,
538 (unsigned long long)span_set_Row,
539 (unsigned long long)span_set->span_row_data_width,
540 span_offset);
541 dev_info(&instance->pdev->dev, "For strip 0x%llx"
542 "row is 0x%llx\n", strip,
543 (unsigned long long) span_set->data_row_start +
544 (unsigned long long) span_set_Row + (span_offset - 1));
545 #endif
546 retval = (span_set->data_row_start + span_set_Row +
547 (span_offset - 1));
548 return retval;
549 }
550 return -1LLU;
551 }
552
553
554 /*
555 ******************************************************************************
556 *
557 * This routine calculates the Start Strip for given row using spanset.
558 *
559 * Inputs :
560 * instance - HBA instance
561 * ld - Logical drive number
562 * row - Row number
563 * map - LD map
564 *
565 * Outputs :
566 *
567 * Strip - Start strip associated with row
568 */
569
570 static u64 get_strip_from_row(struct megasas_instance *instance,
571 u32 ld, u64 row, struct MR_DRV_RAID_MAP_ALL *map)
572 {
573 struct fusion_context *fusion = instance->ctrl_context;
574 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
575 LD_SPAN_SET *span_set;
576 struct MR_QUAD_ELEMENT *quad;
577 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
578 u32 span, info;
579 u64 strip;
580
581 for (info = 0; info < MAX_QUAD_DEPTH; info++) {
582 span_set = &(ldSpanInfo[ld].span_set[info]);
583
584 if (span_set->span_row_data_width == 0)
585 break;
586 if (row > span_set->data_row_end)
587 continue;
588
589 for (span = 0; span < raid->spanDepth; span++)
590 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
591 block_span_info.noElements) >= info+1) {
592 quad = &map->raidMap.ldSpanMap[ld].
593 spanBlock[span].block_span_info.quad[info];
594 if (le64_to_cpu(quad->logStart) <= row &&
595 row <= le64_to_cpu(quad->logEnd) &&
596 mega_mod64((row - le64_to_cpu(quad->logStart)),
597 le32_to_cpu(quad->diff)) == 0) {
598 strip = mega_div64_32
599 (((row - span_set->data_row_start)
600 - le64_to_cpu(quad->logStart)),
601 le32_to_cpu(quad->diff));
602 strip *= span_set->span_row_data_width;
603 strip += span_set->data_strip_start;
604 strip += span_set->strip_offset[span];
605 return strip;
606 }
607 }
608 }
609 dev_err(&instance->pdev->dev, "get_strip_from_row"
610 "returns invalid strip for ld=%x, row=%lx\n",
611 ld, (long unsigned int)row);
612 return -1;
613 }
614
615 /*
616 ******************************************************************************
617 *
618 * This routine calculates the Physical Arm for given strip using spanset.
619 *
620 * Inputs :
621 * instance - HBA instance
622 * ld - Logical drive number
623 * strip - Strip
624 * map - LD map
625 *
626 * Outputs :
627 *
628 * Phys Arm - Phys Arm associated with strip
629 */
630
631 static u32 get_arm_from_strip(struct megasas_instance *instance,
632 u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
633 {
634 struct fusion_context *fusion = instance->ctrl_context;
635 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
636 LD_SPAN_SET *span_set;
637 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
638 u32 info, strip_offset, span, span_offset, retval;
639
640 for (info = 0 ; info < MAX_QUAD_DEPTH; info++) {
641 span_set = &(ldSpanInfo[ld].span_set[info]);
642
643 if (span_set->span_row_data_width == 0)
644 break;
645 if (strip > span_set->data_strip_end)
646 continue;
647
648 strip_offset = (uint)mega_mod64
649 ((strip - span_set->data_strip_start),
650 span_set->span_row_data_width);
651
652 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
653 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
654 block_span_info.noElements) >= info+1) {
655 if (strip_offset >=
656 span_set->strip_offset[span])
657 span_offset =
658 span_set->strip_offset[span];
659 else
660 break;
661 }
662 #if SPAN_DEBUG
663 dev_info(&instance->pdev->dev, "get_arm_from_strip:"
664 "for ld=0x%x strip=0x%lx arm is 0x%x\n", ld,
665 (long unsigned int)strip, (strip_offset - span_offset));
666 #endif
667 retval = (strip_offset - span_offset);
668 return retval;
669 }
670
671 dev_err(&instance->pdev->dev, "get_arm_from_strip"
672 "returns invalid arm for ld=%x strip=%lx\n",
673 ld, (long unsigned int)strip);
674
675 return -1;
676 }
677
678 /* This Function will return Phys arm */
679 u8 get_arm(struct megasas_instance *instance, u32 ld, u8 span, u64 stripe,
680 struct MR_DRV_RAID_MAP_ALL *map)
681 {
682 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
683 /* Need to check correct default value */
684 u32 arm = 0;
685
686 switch (raid->level) {
687 case 0:
688 case 5:
689 case 6:
690 arm = mega_mod64(stripe, SPAN_ROW_SIZE(map, ld, span));
691 break;
692 case 1:
693 /* start with logical arm */
694 arm = get_arm_from_strip(instance, ld, stripe, map);
695 if (arm != -1U)
696 arm *= 2;
697 break;
698 }
699
700 return arm;
701 }
702
703
704 /*
705 ******************************************************************************
706 *
707 * This routine calculates the arm, span and block for the specified stripe and
708 * reference in stripe using spanset
709 *
710 * Inputs :
711 *
712 * ld - Logical drive number
713 * stripRow - Stripe number
714 * stripRef - Reference in stripe
715 *
716 * Outputs :
717 *
718 * span - Span number
719 * block - Absolute Block number in the physical disk
720 */
721 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
722 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
723 struct RAID_CONTEXT *pRAID_Context,
724 struct MR_DRV_RAID_MAP_ALL *map)
725 {
726 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
727 u32 pd, arRef;
728 u8 physArm, span;
729 u64 row;
730 u8 retval = TRUE;
731 u8 do_invader = 0;
732 u64 *pdBlock = &io_info->pdBlock;
733 u16 *pDevHandle = &io_info->devHandle;
734 u32 logArm, rowMod, armQ, arm;
735
736 if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER ||
737 instance->pdev->device == PCI_DEVICE_ID_LSI_FURY))
738 do_invader = 1;
739
740 /*Get row and span from io_info for Uneven Span IO.*/
741 row = io_info->start_row;
742 span = io_info->start_span;
743
744
745 if (raid->level == 6) {
746 logArm = get_arm_from_strip(instance, ld, stripRow, map);
747 if (logArm == -1U)
748 return FALSE;
749 rowMod = mega_mod64(row, SPAN_ROW_SIZE(map, ld, span));
750 armQ = SPAN_ROW_SIZE(map, ld, span) - 1 - rowMod;
751 arm = armQ + 1 + logArm;
752 if (arm >= SPAN_ROW_SIZE(map, ld, span))
753 arm -= SPAN_ROW_SIZE(map, ld, span);
754 physArm = (u8)arm;
755 } else
756 /* Calculate the arm */
757 physArm = get_arm(instance, ld, span, stripRow, map);
758 if (physArm == 0xFF)
759 return FALSE;
760
761 arRef = MR_LdSpanArrayGet(ld, span, map);
762 pd = MR_ArPdGet(arRef, physArm, map);
763
764 if (pd != MR_PD_INVALID)
765 *pDevHandle = MR_PdDevHandleGet(pd, map);
766 else {
767 *pDevHandle = MR_PD_INVALID;
768 if ((raid->level >= 5) &&
769 (!do_invader || (do_invader &&
770 (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
771 pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE;
772 else if (raid->level == 1) {
773 pd = MR_ArPdGet(arRef, physArm + 1, map);
774 if (pd != MR_PD_INVALID)
775 *pDevHandle = MR_PdDevHandleGet(pd, map);
776 }
777 }
778
779 *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
780 pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) |
781 physArm;
782 io_info->span_arm = pRAID_Context->spanArm;
783 return retval;
784 }
785
786 /*
787 ******************************************************************************
788 *
789 * This routine calculates the arm, span and block for the specified stripe and
790 * reference in stripe.
791 *
792 * Inputs :
793 *
794 * ld - Logical drive number
795 * stripRow - Stripe number
796 * stripRef - Reference in stripe
797 *
798 * Outputs :
799 *
800 * span - Span number
801 * block - Absolute Block number in the physical disk
802 */
803 u8 MR_GetPhyParams(struct megasas_instance *instance, u32 ld, u64 stripRow,
804 u16 stripRef, struct IO_REQUEST_INFO *io_info,
805 struct RAID_CONTEXT *pRAID_Context,
806 struct MR_DRV_RAID_MAP_ALL *map)
807 {
808 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
809 u32 pd, arRef;
810 u8 physArm, span;
811 u64 row;
812 u8 retval = TRUE;
813 u8 do_invader = 0;
814 u64 *pdBlock = &io_info->pdBlock;
815 u16 *pDevHandle = &io_info->devHandle;
816
817 if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER ||
818 instance->pdev->device == PCI_DEVICE_ID_LSI_FURY))
819 do_invader = 1;
820
821 row = mega_div64_32(stripRow, raid->rowDataSize);
822
823 if (raid->level == 6) {
824 /* logical arm within row */
825 u32 logArm = mega_mod64(stripRow, raid->rowDataSize);
826 u32 rowMod, armQ, arm;
827
828 if (raid->rowSize == 0)
829 return FALSE;
830 /* get logical row mod */
831 rowMod = mega_mod64(row, raid->rowSize);
832 armQ = raid->rowSize-1-rowMod; /* index of Q drive */
833 arm = armQ+1+logArm; /* data always logically follows Q */
834 if (arm >= raid->rowSize) /* handle wrap condition */
835 arm -= raid->rowSize;
836 physArm = (u8)arm;
837 } else {
838 if (raid->modFactor == 0)
839 return FALSE;
840 physArm = MR_LdDataArmGet(ld, mega_mod64(stripRow,
841 raid->modFactor),
842 map);
843 }
844
845 if (raid->spanDepth == 1) {
846 span = 0;
847 *pdBlock = row << raid->stripeShift;
848 } else {
849 span = (u8)MR_GetSpanBlock(ld, row, pdBlock, map);
850 if (span == SPAN_INVALID)
851 return FALSE;
852 }
853
854 /* Get the array on which this span is present */
855 arRef = MR_LdSpanArrayGet(ld, span, map);
856 pd = MR_ArPdGet(arRef, physArm, map); /* Get the pd */
857
858 if (pd != MR_PD_INVALID)
859 /* Get dev handle from Pd. */
860 *pDevHandle = MR_PdDevHandleGet(pd, map);
861 else {
862 *pDevHandle = MR_PD_INVALID; /* set dev handle as invalid. */
863 if ((raid->level >= 5) &&
864 (!do_invader || (do_invader &&
865 (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
866 pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE;
867 else if (raid->level == 1) {
868 /* Get alternate Pd. */
869 pd = MR_ArPdGet(arRef, physArm + 1, map);
870 if (pd != MR_PD_INVALID)
871 /* Get dev handle from Pd */
872 *pDevHandle = MR_PdDevHandleGet(pd, map);
873 }
874 }
875
876 *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
877 pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) |
878 physArm;
879 io_info->span_arm = pRAID_Context->spanArm;
880 return retval;
881 }
882
883 /*
884 ******************************************************************************
885 *
886 * MR_BuildRaidContext function
887 *
888 * This function will initiate command processing. The start/end row and strip
889 * information is calculated then the lock is acquired.
890 * This function will return 0 if region lock was acquired OR return num strips
891 */
892 u8
893 MR_BuildRaidContext(struct megasas_instance *instance,
894 struct IO_REQUEST_INFO *io_info,
895 struct RAID_CONTEXT *pRAID_Context,
896 struct MR_DRV_RAID_MAP_ALL *map, u8 **raidLUN)
897 {
898 struct MR_LD_RAID *raid;
899 u32 ld, stripSize, stripe_mask;
900 u64 endLba, endStrip, endRow, start_row, start_strip;
901 u64 regStart;
902 u32 regSize;
903 u8 num_strips, numRows;
904 u16 ref_in_start_stripe, ref_in_end_stripe;
905 u64 ldStartBlock;
906 u32 numBlocks, ldTgtId;
907 u8 isRead;
908 u8 retval = 0;
909 u8 startlba_span = SPAN_INVALID;
910 u64 *pdBlock = &io_info->pdBlock;
911
912 ldStartBlock = io_info->ldStartBlock;
913 numBlocks = io_info->numBlocks;
914 ldTgtId = io_info->ldTgtId;
915 isRead = io_info->isRead;
916 io_info->IoforUnevenSpan = 0;
917 io_info->start_span = SPAN_INVALID;
918
919 ld = MR_TargetIdToLdGet(ldTgtId, map);
920 raid = MR_LdRaidGet(ld, map);
921
922 /*
923 * if rowDataSize @RAID map and spanRowDataSize @SPAN INFO are zero
924 * return FALSE
925 */
926 if (raid->rowDataSize == 0) {
927 if (MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize == 0)
928 return FALSE;
929 else if (instance->UnevenSpanSupport) {
930 io_info->IoforUnevenSpan = 1;
931 } else {
932 dev_info(&instance->pdev->dev,
933 "raid->rowDataSize is 0, but has SPAN[0]"
934 "rowDataSize = 0x%0x,"
935 "but there is _NO_ UnevenSpanSupport\n",
936 MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize);
937 return FALSE;
938 }
939 }
940
941 stripSize = 1 << raid->stripeShift;
942 stripe_mask = stripSize-1;
943
944
945 /*
946 * calculate starting row and stripe, and number of strips and rows
947 */
948 start_strip = ldStartBlock >> raid->stripeShift;
949 ref_in_start_stripe = (u16)(ldStartBlock & stripe_mask);
950 endLba = ldStartBlock + numBlocks - 1;
951 ref_in_end_stripe = (u16)(endLba & stripe_mask);
952 endStrip = endLba >> raid->stripeShift;
953 num_strips = (u8)(endStrip - start_strip + 1); /* End strip */
954
955 if (io_info->IoforUnevenSpan) {
956 start_row = get_row_from_strip(instance, ld, start_strip, map);
957 endRow = get_row_from_strip(instance, ld, endStrip, map);
958 if (start_row == -1ULL || endRow == -1ULL) {
959 dev_info(&instance->pdev->dev, "return from %s %d."
960 "Send IO w/o region lock.\n",
961 __func__, __LINE__);
962 return FALSE;
963 }
964
965 if (raid->spanDepth == 1) {
966 startlba_span = 0;
967 *pdBlock = start_row << raid->stripeShift;
968 } else
969 startlba_span = (u8)mr_spanset_get_span_block(instance,
970 ld, start_row, pdBlock, map);
971 if (startlba_span == SPAN_INVALID) {
972 dev_info(&instance->pdev->dev, "return from %s %d"
973 "for row 0x%llx,start strip %llx"
974 "endSrip %llx\n", __func__, __LINE__,
975 (unsigned long long)start_row,
976 (unsigned long long)start_strip,
977 (unsigned long long)endStrip);
978 return FALSE;
979 }
980 io_info->start_span = startlba_span;
981 io_info->start_row = start_row;
982 #if SPAN_DEBUG
983 dev_dbg(&instance->pdev->dev, "Check Span number from %s %d"
984 "for row 0x%llx, start strip 0x%llx end strip 0x%llx"
985 " span 0x%x\n", __func__, __LINE__,
986 (unsigned long long)start_row,
987 (unsigned long long)start_strip,
988 (unsigned long long)endStrip, startlba_span);
989 dev_dbg(&instance->pdev->dev, "start_row 0x%llx endRow 0x%llx"
990 "Start span 0x%x\n", (unsigned long long)start_row,
991 (unsigned long long)endRow, startlba_span);
992 #endif
993 } else {
994 start_row = mega_div64_32(start_strip, raid->rowDataSize);
995 endRow = mega_div64_32(endStrip, raid->rowDataSize);
996 }
997 numRows = (u8)(endRow - start_row + 1);
998
999 /*
1000 * calculate region info.
1001 */
1002
1003 /* assume region is at the start of the first row */
1004 regStart = start_row << raid->stripeShift;
1005 /* assume this IO needs the full row - we'll adjust if not true */
1006 regSize = stripSize;
1007
1008 /* Check if we can send this I/O via FastPath */
1009 if (raid->capability.fpCapable) {
1010 if (isRead)
1011 io_info->fpOkForIo = (raid->capability.fpReadCapable &&
1012 ((num_strips == 1) ||
1013 raid->capability.
1014 fpReadAcrossStripe));
1015 else
1016 io_info->fpOkForIo = (raid->capability.fpWriteCapable &&
1017 ((num_strips == 1) ||
1018 raid->capability.
1019 fpWriteAcrossStripe));
1020 } else
1021 io_info->fpOkForIo = FALSE;
1022
1023 if (numRows == 1) {
1024 /* single-strip IOs can always lock only the data needed */
1025 if (num_strips == 1) {
1026 regStart += ref_in_start_stripe;
1027 regSize = numBlocks;
1028 }
1029 /* multi-strip IOs always need to full stripe locked */
1030 } else if (io_info->IoforUnevenSpan == 0) {
1031 /*
1032 * For Even span region lock optimization.
1033 * If the start strip is the last in the start row
1034 */
1035 if (start_strip == (start_row + 1) * raid->rowDataSize - 1) {
1036 regStart += ref_in_start_stripe;
1037 /* initialize count to sectors from startref to end
1038 of strip */
1039 regSize = stripSize - ref_in_start_stripe;
1040 }
1041
1042 /* add complete rows in the middle of the transfer */
1043 if (numRows > 2)
1044 regSize += (numRows-2) << raid->stripeShift;
1045
1046 /* if IO ends within first strip of last row*/
1047 if (endStrip == endRow*raid->rowDataSize)
1048 regSize += ref_in_end_stripe+1;
1049 else
1050 regSize += stripSize;
1051 } else {
1052 /*
1053 * For Uneven span region lock optimization.
1054 * If the start strip is the last in the start row
1055 */
1056 if (start_strip == (get_strip_from_row(instance, ld, start_row, map) +
1057 SPAN_ROW_DATA_SIZE(map, ld, startlba_span) - 1)) {
1058 regStart += ref_in_start_stripe;
1059 /* initialize count to sectors from
1060 * startRef to end of strip
1061 */
1062 regSize = stripSize - ref_in_start_stripe;
1063 }
1064 /* Add complete rows in the middle of the transfer*/
1065
1066 if (numRows > 2)
1067 /* Add complete rows in the middle of the transfer*/
1068 regSize += (numRows-2) << raid->stripeShift;
1069
1070 /* if IO ends within first strip of last row */
1071 if (endStrip == get_strip_from_row(instance, ld, endRow, map))
1072 regSize += ref_in_end_stripe + 1;
1073 else
1074 regSize += stripSize;
1075 }
1076
1077 pRAID_Context->timeoutValue =
1078 cpu_to_le16(raid->fpIoTimeoutForLd ?
1079 raid->fpIoTimeoutForLd :
1080 map->raidMap.fpPdIoTimeoutSec);
1081 if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER) ||
1082 (instance->pdev->device == PCI_DEVICE_ID_LSI_FURY))
1083 pRAID_Context->regLockFlags = (isRead) ?
1084 raid->regTypeReqOnRead : raid->regTypeReqOnWrite;
1085 else
1086 pRAID_Context->regLockFlags = (isRead) ?
1087 REGION_TYPE_SHARED_READ : raid->regTypeReqOnWrite;
1088 pRAID_Context->VirtualDiskTgtId = raid->targetId;
1089 pRAID_Context->regLockRowLBA = cpu_to_le64(regStart);
1090 pRAID_Context->regLockLength = cpu_to_le32(regSize);
1091 pRAID_Context->configSeqNum = raid->seqNum;
1092 /* save pointer to raid->LUN array */
1093 *raidLUN = raid->LUN;
1094
1095
1096 /*Get Phy Params only if FP capable, or else leave it to MR firmware
1097 to do the calculation.*/
1098 if (io_info->fpOkForIo) {
1099 retval = io_info->IoforUnevenSpan ?
1100 mr_spanset_get_phy_params(instance, ld,
1101 start_strip, ref_in_start_stripe,
1102 io_info, pRAID_Context, map) :
1103 MR_GetPhyParams(instance, ld, start_strip,
1104 ref_in_start_stripe, io_info,
1105 pRAID_Context, map);
1106 /* If IO on an invalid Pd, then FP is not possible.*/
1107 if (io_info->devHandle == MR_PD_INVALID)
1108 io_info->fpOkForIo = FALSE;
1109 return retval;
1110 } else if (isRead) {
1111 uint stripIdx;
1112 for (stripIdx = 0; stripIdx < num_strips; stripIdx++) {
1113 retval = io_info->IoforUnevenSpan ?
1114 mr_spanset_get_phy_params(instance, ld,
1115 start_strip + stripIdx,
1116 ref_in_start_stripe, io_info,
1117 pRAID_Context, map) :
1118 MR_GetPhyParams(instance, ld,
1119 start_strip + stripIdx, ref_in_start_stripe,
1120 io_info, pRAID_Context, map);
1121 if (!retval)
1122 return TRUE;
1123 }
1124 }
1125
1126 #if SPAN_DEBUG
1127 /* Just for testing what arm we get for strip.*/
1128 if (io_info->IoforUnevenSpan)
1129 get_arm_from_strip(instance, ld, start_strip, map);
1130 #endif
1131 return TRUE;
1132 }
1133
1134 /*
1135 ******************************************************************************
1136 *
1137 * This routine pepare spanset info from Valid Raid map and store it into
1138 * local copy of ldSpanInfo per instance data structure.
1139 *
1140 * Inputs :
1141 * map - LD map
1142 * ldSpanInfo - ldSpanInfo per HBA instance
1143 *
1144 */
1145 void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
1146 PLD_SPAN_INFO ldSpanInfo)
1147 {
1148 u8 span, count;
1149 u32 element, span_row_width;
1150 u64 span_row;
1151 struct MR_LD_RAID *raid;
1152 LD_SPAN_SET *span_set, *span_set_prev;
1153 struct MR_QUAD_ELEMENT *quad;
1154 int ldCount;
1155 u16 ld;
1156
1157
1158 for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1159 ld = MR_TargetIdToLdGet(ldCount, map);
1160 if (ld >= MAX_LOGICAL_DRIVES_EXT)
1161 continue;
1162 raid = MR_LdRaidGet(ld, map);
1163 for (element = 0; element < MAX_QUAD_DEPTH; element++) {
1164 for (span = 0; span < raid->spanDepth; span++) {
1165 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
1166 block_span_info.noElements) <
1167 element + 1)
1168 continue;
1169 span_set = &(ldSpanInfo[ld].span_set[element]);
1170 quad = &map->raidMap.ldSpanMap[ld].
1171 spanBlock[span].block_span_info.
1172 quad[element];
1173
1174 span_set->diff = le32_to_cpu(quad->diff);
1175
1176 for (count = 0, span_row_width = 0;
1177 count < raid->spanDepth; count++) {
1178 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].
1179 spanBlock[count].
1180 block_span_info.
1181 noElements) >= element + 1) {
1182 span_set->strip_offset[count] =
1183 span_row_width;
1184 span_row_width +=
1185 MR_LdSpanPtrGet
1186 (ld, count, map)->spanRowDataSize;
1187 printk(KERN_INFO "megasas:"
1188 "span %x rowDataSize %x\n",
1189 count, MR_LdSpanPtrGet
1190 (ld, count, map)->spanRowDataSize);
1191 }
1192 }
1193
1194 span_set->span_row_data_width = span_row_width;
1195 span_row = mega_div64_32(((le64_to_cpu(quad->logEnd) -
1196 le64_to_cpu(quad->logStart)) + le32_to_cpu(quad->diff)),
1197 le32_to_cpu(quad->diff));
1198
1199 if (element == 0) {
1200 span_set->log_start_lba = 0;
1201 span_set->log_end_lba =
1202 ((span_row << raid->stripeShift)
1203 * span_row_width) - 1;
1204
1205 span_set->span_row_start = 0;
1206 span_set->span_row_end = span_row - 1;
1207
1208 span_set->data_strip_start = 0;
1209 span_set->data_strip_end =
1210 (span_row * span_row_width) - 1;
1211
1212 span_set->data_row_start = 0;
1213 span_set->data_row_end =
1214 (span_row * le32_to_cpu(quad->diff)) - 1;
1215 } else {
1216 span_set_prev = &(ldSpanInfo[ld].
1217 span_set[element - 1]);
1218 span_set->log_start_lba =
1219 span_set_prev->log_end_lba + 1;
1220 span_set->log_end_lba =
1221 span_set->log_start_lba +
1222 ((span_row << raid->stripeShift)
1223 * span_row_width) - 1;
1224
1225 span_set->span_row_start =
1226 span_set_prev->span_row_end + 1;
1227 span_set->span_row_end =
1228 span_set->span_row_start + span_row - 1;
1229
1230 span_set->data_strip_start =
1231 span_set_prev->data_strip_end + 1;
1232 span_set->data_strip_end =
1233 span_set->data_strip_start +
1234 (span_row * span_row_width) - 1;
1235
1236 span_set->data_row_start =
1237 span_set_prev->data_row_end + 1;
1238 span_set->data_row_end =
1239 span_set->data_row_start +
1240 (span_row * le32_to_cpu(quad->diff)) - 1;
1241 }
1242 break;
1243 }
1244 if (span == raid->spanDepth)
1245 break;
1246 }
1247 }
1248 #if SPAN_DEBUG
1249 getSpanInfo(map, ldSpanInfo);
1250 #endif
1251
1252 }
1253
1254 void mr_update_load_balance_params(struct MR_DRV_RAID_MAP_ALL *drv_map,
1255 struct LD_LOAD_BALANCE_INFO *lbInfo)
1256 {
1257 int ldCount;
1258 u16 ld;
1259 struct MR_LD_RAID *raid;
1260
1261 if (lb_pending_cmds > 128 || lb_pending_cmds < 1)
1262 lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
1263
1264 for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1265 ld = MR_TargetIdToLdGet(ldCount, drv_map);
1266 if (ld >= MAX_LOGICAL_DRIVES_EXT) {
1267 lbInfo[ldCount].loadBalanceFlag = 0;
1268 continue;
1269 }
1270
1271 raid = MR_LdRaidGet(ld, drv_map);
1272 if ((raid->level != 1) ||
1273 (raid->ldState != MR_LD_STATE_OPTIMAL)) {
1274 lbInfo[ldCount].loadBalanceFlag = 0;
1275 continue;
1276 }
1277 lbInfo[ldCount].loadBalanceFlag = 1;
1278 }
1279 }
1280
1281 u8 megasas_get_best_arm_pd(struct megasas_instance *instance,
1282 struct LD_LOAD_BALANCE_INFO *lbInfo, struct IO_REQUEST_INFO *io_info)
1283 {
1284 struct fusion_context *fusion;
1285 struct MR_LD_RAID *raid;
1286 struct MR_DRV_RAID_MAP_ALL *drv_map;
1287 u16 pend0, pend1, ld;
1288 u64 diff0, diff1;
1289 u8 bestArm, pd0, pd1, span, arm;
1290 u32 arRef, span_row_size;
1291
1292 u64 block = io_info->ldStartBlock;
1293 u32 count = io_info->numBlocks;
1294
1295 span = ((io_info->span_arm & RAID_CTX_SPANARM_SPAN_MASK)
1296 >> RAID_CTX_SPANARM_SPAN_SHIFT);
1297 arm = (io_info->span_arm & RAID_CTX_SPANARM_ARM_MASK);
1298
1299
1300 fusion = instance->ctrl_context;
1301 drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
1302 ld = MR_TargetIdToLdGet(io_info->ldTgtId, drv_map);
1303 raid = MR_LdRaidGet(ld, drv_map);
1304 span_row_size = instance->UnevenSpanSupport ?
1305 SPAN_ROW_SIZE(drv_map, ld, span) : raid->rowSize;
1306
1307 arRef = MR_LdSpanArrayGet(ld, span, drv_map);
1308 pd0 = MR_ArPdGet(arRef, arm, drv_map);
1309 pd1 = MR_ArPdGet(arRef, (arm + 1) >= span_row_size ?
1310 (arm + 1 - span_row_size) : arm + 1, drv_map);
1311
1312 /* get the pending cmds for the data and mirror arms */
1313 pend0 = atomic_read(&lbInfo->scsi_pending_cmds[pd0]);
1314 pend1 = atomic_read(&lbInfo->scsi_pending_cmds[pd1]);
1315
1316 /* Determine the disk whose head is nearer to the req. block */
1317 diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[pd0]);
1318 diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[pd1]);
1319 bestArm = (diff0 <= diff1 ? arm : arm ^ 1);
1320
1321 if ((bestArm == arm && pend0 > pend1 + lb_pending_cmds) ||
1322 (bestArm != arm && pend1 > pend0 + lb_pending_cmds))
1323 bestArm ^= 1;
1324
1325 /* Update the last accessed block on the correct pd */
1326 io_info->pd_after_lb = (bestArm == arm) ? pd0 : pd1;
1327 lbInfo->last_accessed_block[io_info->pd_after_lb] = block + count - 1;
1328 io_info->span_arm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) | bestArm;
1329 #if SPAN_DEBUG
1330 if (arm != bestArm)
1331 dev_dbg(&instance->pdev->dev, "LSI Debug R1 Load balance "
1332 "occur - span 0x%x arm 0x%x bestArm 0x%x "
1333 "io_info->span_arm 0x%x\n",
1334 span, arm, bestArm, io_info->span_arm);
1335 #endif
1336 return io_info->pd_after_lb;
1337 }
1338
1339 u16 get_updated_dev_handle(struct megasas_instance *instance,
1340 struct LD_LOAD_BALANCE_INFO *lbInfo, struct IO_REQUEST_INFO *io_info)
1341 {
1342 u8 arm_pd;
1343 u16 devHandle;
1344 struct fusion_context *fusion;
1345 struct MR_DRV_RAID_MAP_ALL *drv_map;
1346
1347 fusion = instance->ctrl_context;
1348 drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
1349
1350 /* get best new arm (PD ID) */
1351 arm_pd = megasas_get_best_arm_pd(instance, lbInfo, io_info);
1352 devHandle = MR_PdDevHandleGet(arm_pd, drv_map);
1353 atomic_inc(&lbInfo->scsi_pending_cmds[arm_pd]);
1354 return devHandle;
1355 }
Linux kernel - Deliverables
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