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Merge branches 'for-4.11/upstream-fixes', 'for-4.12/accutouch', 'for-4.12/cp2112...
[mirror_ubuntu-artful-kernel.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
70 #ifdef FALSE
71 #undef FALSE
72 #endif
73 #define FALSE 0
74
75 #ifdef TRUE
76 #undef TRUE
77 #endif
78 #define TRUE 1
79
80 #define SPAN_ROW_SIZE(map, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowSize)
81 #define SPAN_ROW_DATA_SIZE(map_, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowDataSize)
82 #define SPAN_INVALID 0xff
83
84 /* Prototypes */
85 static void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
86 PLD_SPAN_INFO ldSpanInfo);
87 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
88 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
89 struct RAID_CONTEXT *pRAID_Context, struct MR_DRV_RAID_MAP_ALL *map);
90 static u64 get_row_from_strip(struct megasas_instance *instance, u32 ld,
91 u64 strip, struct MR_DRV_RAID_MAP_ALL *map);
92
93 u32 mega_mod64(u64 dividend, u32 divisor)
94 {
95 u64 d;
96 u32 remainder;
97
98 if (!divisor)
99 printk(KERN_ERR "megasas : DIVISOR is zero, in div fn\n");
100 d = dividend;
101 remainder = do_div(d, divisor);
102 return remainder;
103 }
104
105 /**
106 * @param dividend : Dividend
107 * @param divisor : Divisor
108 *
109 * @return quotient
110 **/
111 u64 mega_div64_32(uint64_t dividend, uint32_t divisor)
112 {
113 u32 remainder;
114 u64 d;
115
116 if (!divisor)
117 printk(KERN_ERR "megasas : DIVISOR is zero in mod fn\n");
118
119 d = dividend;
120 remainder = do_div(d, divisor);
121
122 return d;
123 }
124
125 struct MR_LD_RAID *MR_LdRaidGet(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
126 {
127 return &map->raidMap.ldSpanMap[ld].ldRaid;
128 }
129
130 static struct MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld,
131 struct MR_DRV_RAID_MAP_ALL
132 *map)
133 {
134 return &map->raidMap.ldSpanMap[ld].spanBlock[0];
135 }
136
137 static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, struct MR_DRV_RAID_MAP_ALL *map)
138 {
139 return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx];
140 }
141
142 u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_DRV_RAID_MAP_ALL *map)
143 {
144 return le16_to_cpu(map->raidMap.arMapInfo[ar].pd[arm]);
145 }
146
147 u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_DRV_RAID_MAP_ALL *map)
148 {
149 return le16_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef);
150 }
151
152 __le16 MR_PdDevHandleGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
153 {
154 return map->raidMap.devHndlInfo[pd].curDevHdl;
155 }
156
157 static u8 MR_PdInterfaceTypeGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
158 {
159 return map->raidMap.devHndlInfo[pd].interfaceType;
160 }
161
162 u16 MR_GetLDTgtId(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
163 {
164 return le16_to_cpu(map->raidMap.ldSpanMap[ld].ldRaid.targetId);
165 }
166
167 u16 MR_TargetIdToLdGet(u32 ldTgtId, struct MR_DRV_RAID_MAP_ALL *map)
168 {
169 return map->raidMap.ldTgtIdToLd[ldTgtId];
170 }
171
172 static struct MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span,
173 struct MR_DRV_RAID_MAP_ALL *map)
174 {
175 return &map->raidMap.ldSpanMap[ld].spanBlock[span].span;
176 }
177
178 /*
179 * This function will Populate Driver Map using firmware raid map
180 */
181 void MR_PopulateDrvRaidMap(struct megasas_instance *instance)
182 {
183 struct fusion_context *fusion = instance->ctrl_context;
184 struct MR_FW_RAID_MAP_ALL *fw_map_old = NULL;
185 struct MR_FW_RAID_MAP *pFwRaidMap = NULL;
186 int i, j;
187 u16 ld_count;
188 struct MR_FW_RAID_MAP_DYNAMIC *fw_map_dyn;
189 struct MR_FW_RAID_MAP_EXT *fw_map_ext;
190 struct MR_RAID_MAP_DESC_TABLE *desc_table;
191
192
193 struct MR_DRV_RAID_MAP_ALL *drv_map =
194 fusion->ld_drv_map[(instance->map_id & 1)];
195 struct MR_DRV_RAID_MAP *pDrvRaidMap = &drv_map->raidMap;
196 void *raid_map_data = NULL;
197
198 memset(drv_map, 0, fusion->drv_map_sz);
199 memset(pDrvRaidMap->ldTgtIdToLd,
200 0xff, (sizeof(u16) * MAX_LOGICAL_DRIVES_DYN));
201
202 if (instance->max_raid_mapsize) {
203 fw_map_dyn = fusion->ld_map[(instance->map_id & 1)];
204 desc_table =
205 (struct MR_RAID_MAP_DESC_TABLE *)((void *)fw_map_dyn + le32_to_cpu(fw_map_dyn->desc_table_offset));
206 if (desc_table != fw_map_dyn->raid_map_desc_table)
207 dev_dbg(&instance->pdev->dev, "offsets of desc table are not matching desc %p original %p\n",
208 desc_table, fw_map_dyn->raid_map_desc_table);
209
210 ld_count = (u16)le16_to_cpu(fw_map_dyn->ld_count);
211 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
212 pDrvRaidMap->fpPdIoTimeoutSec =
213 fw_map_dyn->fp_pd_io_timeout_sec;
214 pDrvRaidMap->totalSize =
215 cpu_to_le32(sizeof(struct MR_DRV_RAID_MAP_ALL));
216 /* point to actual data starting point*/
217 raid_map_data = (void *)fw_map_dyn +
218 le32_to_cpu(fw_map_dyn->desc_table_offset) +
219 le32_to_cpu(fw_map_dyn->desc_table_size);
220
221 for (i = 0; i < le32_to_cpu(fw_map_dyn->desc_table_num_elements); ++i) {
222 switch (le32_to_cpu(desc_table->raid_map_desc_type)) {
223 case RAID_MAP_DESC_TYPE_DEVHDL_INFO:
224 fw_map_dyn->dev_hndl_info =
225 (struct MR_DEV_HANDLE_INFO *)(raid_map_data + le32_to_cpu(desc_table->raid_map_desc_offset));
226 memcpy(pDrvRaidMap->devHndlInfo,
227 fw_map_dyn->dev_hndl_info,
228 sizeof(struct MR_DEV_HANDLE_INFO) *
229 le32_to_cpu(desc_table->raid_map_desc_elements));
230 break;
231 case RAID_MAP_DESC_TYPE_TGTID_INFO:
232 fw_map_dyn->ld_tgt_id_to_ld =
233 (u16 *)(raid_map_data +
234 le32_to_cpu(desc_table->raid_map_desc_offset));
235 for (j = 0; j < le32_to_cpu(desc_table->raid_map_desc_elements); j++) {
236 pDrvRaidMap->ldTgtIdToLd[j] =
237 le16_to_cpu(fw_map_dyn->ld_tgt_id_to_ld[j]);
238 }
239 break;
240 case RAID_MAP_DESC_TYPE_ARRAY_INFO:
241 fw_map_dyn->ar_map_info =
242 (struct MR_ARRAY_INFO *)
243 (raid_map_data + le32_to_cpu(desc_table->raid_map_desc_offset));
244 memcpy(pDrvRaidMap->arMapInfo,
245 fw_map_dyn->ar_map_info,
246 sizeof(struct MR_ARRAY_INFO) *
247 le32_to_cpu(desc_table->raid_map_desc_elements));
248 break;
249 case RAID_MAP_DESC_TYPE_SPAN_INFO:
250 fw_map_dyn->ld_span_map =
251 (struct MR_LD_SPAN_MAP *)
252 (raid_map_data +
253 le32_to_cpu(desc_table->raid_map_desc_offset));
254 memcpy(pDrvRaidMap->ldSpanMap,
255 fw_map_dyn->ld_span_map,
256 sizeof(struct MR_LD_SPAN_MAP) *
257 le32_to_cpu(desc_table->raid_map_desc_elements));
258 break;
259 default:
260 dev_dbg(&instance->pdev->dev, "wrong number of desctableElements %d\n",
261 fw_map_dyn->desc_table_num_elements);
262 }
263 ++desc_table;
264 }
265
266 } else if (instance->supportmax256vd) {
267 fw_map_ext =
268 (struct MR_FW_RAID_MAP_EXT *)fusion->ld_map[(instance->map_id & 1)];
269 ld_count = (u16)le16_to_cpu(fw_map_ext->ldCount);
270 if (ld_count > MAX_LOGICAL_DRIVES_EXT) {
271 dev_dbg(&instance->pdev->dev, "megaraid_sas: LD count exposed in RAID map in not valid\n");
272 return;
273 }
274
275 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
276 pDrvRaidMap->fpPdIoTimeoutSec = fw_map_ext->fpPdIoTimeoutSec;
277 for (i = 0; i < (MAX_LOGICAL_DRIVES_EXT); i++)
278 pDrvRaidMap->ldTgtIdToLd[i] =
279 (u16)fw_map_ext->ldTgtIdToLd[i];
280 memcpy(pDrvRaidMap->ldSpanMap, fw_map_ext->ldSpanMap,
281 sizeof(struct MR_LD_SPAN_MAP) * ld_count);
282 memcpy(pDrvRaidMap->arMapInfo, fw_map_ext->arMapInfo,
283 sizeof(struct MR_ARRAY_INFO) * MAX_API_ARRAYS_EXT);
284 memcpy(pDrvRaidMap->devHndlInfo, fw_map_ext->devHndlInfo,
285 sizeof(struct MR_DEV_HANDLE_INFO) *
286 MAX_RAIDMAP_PHYSICAL_DEVICES);
287
288 /* New Raid map will not set totalSize, so keep expected value
289 * for legacy code in ValidateMapInfo
290 */
291 pDrvRaidMap->totalSize =
292 cpu_to_le32(sizeof(struct MR_FW_RAID_MAP_EXT));
293 } else {
294 fw_map_old = (struct MR_FW_RAID_MAP_ALL *)
295 fusion->ld_map[(instance->map_id & 1)];
296 pFwRaidMap = &fw_map_old->raidMap;
297 ld_count = (u16)le32_to_cpu(pFwRaidMap->ldCount);
298 pDrvRaidMap->totalSize = pFwRaidMap->totalSize;
299 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
300 pDrvRaidMap->fpPdIoTimeoutSec = pFwRaidMap->fpPdIoTimeoutSec;
301 for (i = 0; i < MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS; i++)
302 pDrvRaidMap->ldTgtIdToLd[i] =
303 (u8)pFwRaidMap->ldTgtIdToLd[i];
304 for (i = 0; i < ld_count; i++) {
305 pDrvRaidMap->ldSpanMap[i] = pFwRaidMap->ldSpanMap[i];
306 }
307 memcpy(pDrvRaidMap->arMapInfo, pFwRaidMap->arMapInfo,
308 sizeof(struct MR_ARRAY_INFO) * MAX_RAIDMAP_ARRAYS);
309 memcpy(pDrvRaidMap->devHndlInfo, pFwRaidMap->devHndlInfo,
310 sizeof(struct MR_DEV_HANDLE_INFO) *
311 MAX_RAIDMAP_PHYSICAL_DEVICES);
312 }
313 }
314
315 /*
316 * This function will validate Map info data provided by FW
317 */
318 u8 MR_ValidateMapInfo(struct megasas_instance *instance)
319 {
320 struct fusion_context *fusion;
321 struct MR_DRV_RAID_MAP_ALL *drv_map;
322 struct MR_DRV_RAID_MAP *pDrvRaidMap;
323 struct LD_LOAD_BALANCE_INFO *lbInfo;
324 PLD_SPAN_INFO ldSpanInfo;
325 struct MR_LD_RAID *raid;
326 u16 num_lds, i;
327 u16 ld;
328 u32 expected_size;
329
330
331 MR_PopulateDrvRaidMap(instance);
332
333 fusion = instance->ctrl_context;
334 drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
335 pDrvRaidMap = &drv_map->raidMap;
336
337 lbInfo = fusion->load_balance_info;
338 ldSpanInfo = fusion->log_to_span;
339
340 if (instance->max_raid_mapsize)
341 expected_size = sizeof(struct MR_DRV_RAID_MAP_ALL);
342 else if (instance->supportmax256vd)
343 expected_size = sizeof(struct MR_FW_RAID_MAP_EXT);
344 else
345 expected_size =
346 (sizeof(struct MR_FW_RAID_MAP) - sizeof(struct MR_LD_SPAN_MAP) +
347 (sizeof(struct MR_LD_SPAN_MAP) * le16_to_cpu(pDrvRaidMap->ldCount)));
348
349 if (le32_to_cpu(pDrvRaidMap->totalSize) != expected_size) {
350 dev_dbg(&instance->pdev->dev, "megasas: map info structure size 0x%x",
351 le32_to_cpu(pDrvRaidMap->totalSize));
352 dev_dbg(&instance->pdev->dev, "is not matching expected size 0x%x\n",
353 (unsigned int)expected_size);
354 dev_err(&instance->pdev->dev, "megasas: span map %x, pDrvRaidMap->totalSize : %x\n",
355 (unsigned int)sizeof(struct MR_LD_SPAN_MAP),
356 le32_to_cpu(pDrvRaidMap->totalSize));
357 return 0;
358 }
359
360 if (instance->UnevenSpanSupport)
361 mr_update_span_set(drv_map, ldSpanInfo);
362
363 if (lbInfo)
364 mr_update_load_balance_params(drv_map, lbInfo);
365
366 num_lds = le16_to_cpu(drv_map->raidMap.ldCount);
367
368 /*Convert Raid capability values to CPU arch */
369 for (i = 0; (num_lds > 0) && (i < MAX_LOGICAL_DRIVES_EXT); i++) {
370 ld = MR_TargetIdToLdGet(i, drv_map);
371
372 /* For non existing VDs, iterate to next VD*/
373 if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
374 continue;
375
376 raid = MR_LdRaidGet(ld, drv_map);
377 le32_to_cpus((u32 *)&raid->capability);
378
379 num_lds--;
380 }
381
382 return 1;
383 }
384
385 u32 MR_GetSpanBlock(u32 ld, u64 row, u64 *span_blk,
386 struct MR_DRV_RAID_MAP_ALL *map)
387 {
388 struct MR_SPAN_BLOCK_INFO *pSpanBlock = MR_LdSpanInfoGet(ld, map);
389 struct MR_QUAD_ELEMENT *quad;
390 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
391 u32 span, j;
392
393 for (span = 0; span < raid->spanDepth; span++, pSpanBlock++) {
394
395 for (j = 0; j < le32_to_cpu(pSpanBlock->block_span_info.noElements); j++) {
396 quad = &pSpanBlock->block_span_info.quad[j];
397
398 if (le32_to_cpu(quad->diff) == 0)
399 return SPAN_INVALID;
400 if (le64_to_cpu(quad->logStart) <= row && row <=
401 le64_to_cpu(quad->logEnd) && (mega_mod64(row - le64_to_cpu(quad->logStart),
402 le32_to_cpu(quad->diff))) == 0) {
403 if (span_blk != NULL) {
404 u64 blk, debugBlk;
405 blk = mega_div64_32((row-le64_to_cpu(quad->logStart)), le32_to_cpu(quad->diff));
406 debugBlk = blk;
407
408 blk = (blk + le64_to_cpu(quad->offsetInSpan)) << raid->stripeShift;
409 *span_blk = blk;
410 }
411 return span;
412 }
413 }
414 }
415 return SPAN_INVALID;
416 }
417
418 /*
419 ******************************************************************************
420 *
421 * This routine calculates the Span block for given row using spanset.
422 *
423 * Inputs :
424 * instance - HBA instance
425 * ld - Logical drive number
426 * row - Row number
427 * map - LD map
428 *
429 * Outputs :
430 *
431 * span - Span number
432 * block - Absolute Block number in the physical disk
433 * div_error - Devide error code.
434 */
435
436 u32 mr_spanset_get_span_block(struct megasas_instance *instance,
437 u32 ld, u64 row, u64 *span_blk, struct MR_DRV_RAID_MAP_ALL *map)
438 {
439 struct fusion_context *fusion = instance->ctrl_context;
440 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
441 LD_SPAN_SET *span_set;
442 struct MR_QUAD_ELEMENT *quad;
443 u32 span, info;
444 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
445
446 for (info = 0; info < MAX_QUAD_DEPTH; info++) {
447 span_set = &(ldSpanInfo[ld].span_set[info]);
448
449 if (span_set->span_row_data_width == 0)
450 break;
451
452 if (row > span_set->data_row_end)
453 continue;
454
455 for (span = 0; span < raid->spanDepth; span++)
456 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
457 block_span_info.noElements) >= info+1) {
458 quad = &map->raidMap.ldSpanMap[ld].
459 spanBlock[span].
460 block_span_info.quad[info];
461 if (le32_to_cpu(quad->diff) == 0)
462 return SPAN_INVALID;
463 if (le64_to_cpu(quad->logStart) <= row &&
464 row <= le64_to_cpu(quad->logEnd) &&
465 (mega_mod64(row - le64_to_cpu(quad->logStart),
466 le32_to_cpu(quad->diff))) == 0) {
467 if (span_blk != NULL) {
468 u64 blk;
469 blk = mega_div64_32
470 ((row - le64_to_cpu(quad->logStart)),
471 le32_to_cpu(quad->diff));
472 blk = (blk + le64_to_cpu(quad->offsetInSpan))
473 << raid->stripeShift;
474 *span_blk = blk;
475 }
476 return span;
477 }
478 }
479 }
480 return SPAN_INVALID;
481 }
482
483 /*
484 ******************************************************************************
485 *
486 * This routine calculates the row for given strip using spanset.
487 *
488 * Inputs :
489 * instance - HBA instance
490 * ld - Logical drive number
491 * Strip - Strip
492 * map - LD map
493 *
494 * Outputs :
495 *
496 * row - row associated with strip
497 */
498
499 static u64 get_row_from_strip(struct megasas_instance *instance,
500 u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
501 {
502 struct fusion_context *fusion = instance->ctrl_context;
503 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
504 LD_SPAN_SET *span_set;
505 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
506 u32 info, strip_offset, span, span_offset;
507 u64 span_set_Strip, span_set_Row, retval;
508
509 for (info = 0; info < MAX_QUAD_DEPTH; info++) {
510 span_set = &(ldSpanInfo[ld].span_set[info]);
511
512 if (span_set->span_row_data_width == 0)
513 break;
514 if (strip > span_set->data_strip_end)
515 continue;
516
517 span_set_Strip = strip - span_set->data_strip_start;
518 strip_offset = mega_mod64(span_set_Strip,
519 span_set->span_row_data_width);
520 span_set_Row = mega_div64_32(span_set_Strip,
521 span_set->span_row_data_width) * span_set->diff;
522 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
523 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
524 block_span_info.noElements) >= info+1) {
525 if (strip_offset >=
526 span_set->strip_offset[span])
527 span_offset++;
528 else
529 break;
530 }
531
532 retval = (span_set->data_row_start + span_set_Row +
533 (span_offset - 1));
534 return retval;
535 }
536 return -1LLU;
537 }
538
539
540 /*
541 ******************************************************************************
542 *
543 * This routine calculates the Start Strip for given row using spanset.
544 *
545 * Inputs :
546 * instance - HBA instance
547 * ld - Logical drive number
548 * row - Row number
549 * map - LD map
550 *
551 * Outputs :
552 *
553 * Strip - Start strip associated with row
554 */
555
556 static u64 get_strip_from_row(struct megasas_instance *instance,
557 u32 ld, u64 row, struct MR_DRV_RAID_MAP_ALL *map)
558 {
559 struct fusion_context *fusion = instance->ctrl_context;
560 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
561 LD_SPAN_SET *span_set;
562 struct MR_QUAD_ELEMENT *quad;
563 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
564 u32 span, info;
565 u64 strip;
566
567 for (info = 0; info < MAX_QUAD_DEPTH; info++) {
568 span_set = &(ldSpanInfo[ld].span_set[info]);
569
570 if (span_set->span_row_data_width == 0)
571 break;
572 if (row > span_set->data_row_end)
573 continue;
574
575 for (span = 0; span < raid->spanDepth; span++)
576 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
577 block_span_info.noElements) >= info+1) {
578 quad = &map->raidMap.ldSpanMap[ld].
579 spanBlock[span].block_span_info.quad[info];
580 if (le64_to_cpu(quad->logStart) <= row &&
581 row <= le64_to_cpu(quad->logEnd) &&
582 mega_mod64((row - le64_to_cpu(quad->logStart)),
583 le32_to_cpu(quad->diff)) == 0) {
584 strip = mega_div64_32
585 (((row - span_set->data_row_start)
586 - le64_to_cpu(quad->logStart)),
587 le32_to_cpu(quad->diff));
588 strip *= span_set->span_row_data_width;
589 strip += span_set->data_strip_start;
590 strip += span_set->strip_offset[span];
591 return strip;
592 }
593 }
594 }
595 dev_err(&instance->pdev->dev, "get_strip_from_row"
596 "returns invalid strip for ld=%x, row=%lx\n",
597 ld, (long unsigned int)row);
598 return -1;
599 }
600
601 /*
602 ******************************************************************************
603 *
604 * This routine calculates the Physical Arm for given strip using spanset.
605 *
606 * Inputs :
607 * instance - HBA instance
608 * ld - Logical drive number
609 * strip - Strip
610 * map - LD map
611 *
612 * Outputs :
613 *
614 * Phys Arm - Phys Arm associated with strip
615 */
616
617 static u32 get_arm_from_strip(struct megasas_instance *instance,
618 u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
619 {
620 struct fusion_context *fusion = instance->ctrl_context;
621 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
622 LD_SPAN_SET *span_set;
623 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
624 u32 info, strip_offset, span, span_offset, retval;
625
626 for (info = 0 ; info < MAX_QUAD_DEPTH; info++) {
627 span_set = &(ldSpanInfo[ld].span_set[info]);
628
629 if (span_set->span_row_data_width == 0)
630 break;
631 if (strip > span_set->data_strip_end)
632 continue;
633
634 strip_offset = (uint)mega_mod64
635 ((strip - span_set->data_strip_start),
636 span_set->span_row_data_width);
637
638 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
639 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
640 block_span_info.noElements) >= info+1) {
641 if (strip_offset >=
642 span_set->strip_offset[span])
643 span_offset =
644 span_set->strip_offset[span];
645 else
646 break;
647 }
648
649 retval = (strip_offset - span_offset);
650 return retval;
651 }
652
653 dev_err(&instance->pdev->dev, "get_arm_from_strip"
654 "returns invalid arm for ld=%x strip=%lx\n",
655 ld, (long unsigned int)strip);
656
657 return -1;
658 }
659
660 /* This Function will return Phys arm */
661 u8 get_arm(struct megasas_instance *instance, u32 ld, u8 span, u64 stripe,
662 struct MR_DRV_RAID_MAP_ALL *map)
663 {
664 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
665 /* Need to check correct default value */
666 u32 arm = 0;
667
668 switch (raid->level) {
669 case 0:
670 case 5:
671 case 6:
672 arm = mega_mod64(stripe, SPAN_ROW_SIZE(map, ld, span));
673 break;
674 case 1:
675 /* start with logical arm */
676 arm = get_arm_from_strip(instance, ld, stripe, map);
677 if (arm != -1U)
678 arm *= 2;
679 break;
680 }
681
682 return arm;
683 }
684
685
686 /*
687 ******************************************************************************
688 *
689 * This routine calculates the arm, span and block for the specified stripe and
690 * reference in stripe using spanset
691 *
692 * Inputs :
693 *
694 * ld - Logical drive number
695 * stripRow - Stripe number
696 * stripRef - Reference in stripe
697 *
698 * Outputs :
699 *
700 * span - Span number
701 * block - Absolute Block number in the physical disk
702 */
703 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
704 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
705 struct RAID_CONTEXT *pRAID_Context,
706 struct MR_DRV_RAID_MAP_ALL *map)
707 {
708 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
709 u32 pd, arRef, r1_alt_pd;
710 u8 physArm, span;
711 u64 row;
712 u8 retval = TRUE;
713 u64 *pdBlock = &io_info->pdBlock;
714 __le16 *pDevHandle = &io_info->devHandle;
715 u8 *pPdInterface = &io_info->pd_interface;
716 u32 logArm, rowMod, armQ, arm;
717 struct fusion_context *fusion;
718
719 fusion = instance->ctrl_context;
720 *pDevHandle = cpu_to_le16(MR_DEVHANDLE_INVALID);
721
722 /*Get row and span from io_info for Uneven Span IO.*/
723 row = io_info->start_row;
724 span = io_info->start_span;
725
726
727 if (raid->level == 6) {
728 logArm = get_arm_from_strip(instance, ld, stripRow, map);
729 if (logArm == -1U)
730 return FALSE;
731 rowMod = mega_mod64(row, SPAN_ROW_SIZE(map, ld, span));
732 armQ = SPAN_ROW_SIZE(map, ld, span) - 1 - rowMod;
733 arm = armQ + 1 + logArm;
734 if (arm >= SPAN_ROW_SIZE(map, ld, span))
735 arm -= SPAN_ROW_SIZE(map, ld, span);
736 physArm = (u8)arm;
737 } else
738 /* Calculate the arm */
739 physArm = get_arm(instance, ld, span, stripRow, map);
740 if (physArm == 0xFF)
741 return FALSE;
742
743 arRef = MR_LdSpanArrayGet(ld, span, map);
744 pd = MR_ArPdGet(arRef, physArm, map);
745
746 if (pd != MR_PD_INVALID) {
747 *pDevHandle = MR_PdDevHandleGet(pd, map);
748 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
749 /* get second pd also for raid 1/10 fast path writes*/
750 if (instance->is_ventura &&
751 (raid->level == 1) &&
752 !io_info->isRead) {
753 r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map);
754 if (r1_alt_pd != MR_PD_INVALID)
755 io_info->r1_alt_dev_handle =
756 MR_PdDevHandleGet(r1_alt_pd, map);
757 }
758 } else {
759 if ((raid->level >= 5) &&
760 ((fusion->adapter_type == THUNDERBOLT_SERIES) ||
761 ((fusion->adapter_type == INVADER_SERIES) &&
762 (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
763 pRAID_Context->reg_lock_flags = REGION_TYPE_EXCLUSIVE;
764 else if (raid->level == 1) {
765 physArm = physArm + 1;
766 pd = MR_ArPdGet(arRef, physArm, map);
767 if (pd != MR_PD_INVALID) {
768 *pDevHandle = MR_PdDevHandleGet(pd, map);
769 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
770 }
771 }
772 }
773
774 *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
775 if (instance->is_ventura) {
776 ((struct RAID_CONTEXT_G35 *)pRAID_Context)->span_arm =
777 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
778 io_info->span_arm =
779 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
780 } else {
781 pRAID_Context->span_arm =
782 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
783 io_info->span_arm = pRAID_Context->span_arm;
784 }
785 io_info->pd_after_lb = pd;
786 return retval;
787 }
788
789 /*
790 ******************************************************************************
791 *
792 * This routine calculates the arm, span and block for the specified stripe and
793 * reference in stripe.
794 *
795 * Inputs :
796 *
797 * ld - Logical drive number
798 * stripRow - Stripe number
799 * stripRef - Reference in stripe
800 *
801 * Outputs :
802 *
803 * span - Span number
804 * block - Absolute Block number in the physical disk
805 */
806 u8 MR_GetPhyParams(struct megasas_instance *instance, u32 ld, u64 stripRow,
807 u16 stripRef, struct IO_REQUEST_INFO *io_info,
808 struct RAID_CONTEXT *pRAID_Context,
809 struct MR_DRV_RAID_MAP_ALL *map)
810 {
811 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
812 u32 pd, arRef, r1_alt_pd;
813 u8 physArm, span;
814 u64 row;
815 u8 retval = TRUE;
816 u64 *pdBlock = &io_info->pdBlock;
817 __le16 *pDevHandle = &io_info->devHandle;
818 u8 *pPdInterface = &io_info->pd_interface;
819 struct fusion_context *fusion;
820
821 fusion = instance->ctrl_context;
822 *pDevHandle = cpu_to_le16(MR_DEVHANDLE_INVALID);
823
824 row = mega_div64_32(stripRow, raid->rowDataSize);
825
826 if (raid->level == 6) {
827 /* logical arm within row */
828 u32 logArm = mega_mod64(stripRow, raid->rowDataSize);
829 u32 rowMod, armQ, arm;
830
831 if (raid->rowSize == 0)
832 return FALSE;
833 /* get logical row mod */
834 rowMod = mega_mod64(row, raid->rowSize);
835 armQ = raid->rowSize-1-rowMod; /* index of Q drive */
836 arm = armQ+1+logArm; /* data always logically follows Q */
837 if (arm >= raid->rowSize) /* handle wrap condition */
838 arm -= raid->rowSize;
839 physArm = (u8)arm;
840 } else {
841 if (raid->modFactor == 0)
842 return FALSE;
843 physArm = MR_LdDataArmGet(ld, mega_mod64(stripRow,
844 raid->modFactor),
845 map);
846 }
847
848 if (raid->spanDepth == 1) {
849 span = 0;
850 *pdBlock = row << raid->stripeShift;
851 } else {
852 span = (u8)MR_GetSpanBlock(ld, row, pdBlock, map);
853 if (span == SPAN_INVALID)
854 return FALSE;
855 }
856
857 /* Get the array on which this span is present */
858 arRef = MR_LdSpanArrayGet(ld, span, map);
859 pd = MR_ArPdGet(arRef, physArm, map); /* Get the pd */
860
861 if (pd != MR_PD_INVALID) {
862 /* Get dev handle from Pd. */
863 *pDevHandle = MR_PdDevHandleGet(pd, map);
864 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
865 /* get second pd also for raid 1/10 fast path writes*/
866 if (instance->is_ventura &&
867 (raid->level == 1) &&
868 !io_info->isRead) {
869 r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map);
870 if (r1_alt_pd != MR_PD_INVALID)
871 io_info->r1_alt_dev_handle =
872 MR_PdDevHandleGet(r1_alt_pd, map);
873 }
874 } else {
875 if ((raid->level >= 5) &&
876 ((fusion->adapter_type == THUNDERBOLT_SERIES) ||
877 ((fusion->adapter_type == INVADER_SERIES) &&
878 (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
879 pRAID_Context->reg_lock_flags = REGION_TYPE_EXCLUSIVE;
880 else if (raid->level == 1) {
881 /* Get alternate Pd. */
882 physArm = physArm + 1;
883 pd = MR_ArPdGet(arRef, physArm, map);
884 if (pd != MR_PD_INVALID) {
885 /* Get dev handle from Pd */
886 *pDevHandle = MR_PdDevHandleGet(pd, map);
887 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
888 }
889 }
890 }
891
892 *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
893 if (instance->is_ventura) {
894 ((struct RAID_CONTEXT_G35 *)pRAID_Context)->span_arm =
895 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
896 io_info->span_arm =
897 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
898 } else {
899 pRAID_Context->span_arm =
900 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
901 io_info->span_arm = pRAID_Context->span_arm;
902 }
903 io_info->pd_after_lb = pd;
904 return retval;
905 }
906
907 /*
908 ******************************************************************************
909 *
910 * MR_BuildRaidContext function
911 *
912 * This function will initiate command processing. The start/end row and strip
913 * information is calculated then the lock is acquired.
914 * This function will return 0 if region lock was acquired OR return num strips
915 */
916 u8
917 MR_BuildRaidContext(struct megasas_instance *instance,
918 struct IO_REQUEST_INFO *io_info,
919 struct RAID_CONTEXT *pRAID_Context,
920 struct MR_DRV_RAID_MAP_ALL *map, u8 **raidLUN)
921 {
922 struct fusion_context *fusion;
923 struct MR_LD_RAID *raid;
924 u32 stripSize, stripe_mask;
925 u64 endLba, endStrip, endRow, start_row, start_strip;
926 u64 regStart;
927 u32 regSize;
928 u8 num_strips, numRows;
929 u16 ref_in_start_stripe, ref_in_end_stripe;
930 u64 ldStartBlock;
931 u32 numBlocks, ldTgtId;
932 u8 isRead;
933 u8 retval = 0;
934 u8 startlba_span = SPAN_INVALID;
935 u64 *pdBlock = &io_info->pdBlock;
936 u16 ld;
937
938 ldStartBlock = io_info->ldStartBlock;
939 numBlocks = io_info->numBlocks;
940 ldTgtId = io_info->ldTgtId;
941 isRead = io_info->isRead;
942 io_info->IoforUnevenSpan = 0;
943 io_info->start_span = SPAN_INVALID;
944 fusion = instance->ctrl_context;
945
946 ld = MR_TargetIdToLdGet(ldTgtId, map);
947 raid = MR_LdRaidGet(ld, map);
948 /*check read ahead bit*/
949 io_info->ra_capable = raid->capability.ra_capable;
950
951 /*
952 * if rowDataSize @RAID map and spanRowDataSize @SPAN INFO are zero
953 * return FALSE
954 */
955 if (raid->rowDataSize == 0) {
956 if (MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize == 0)
957 return FALSE;
958 else if (instance->UnevenSpanSupport) {
959 io_info->IoforUnevenSpan = 1;
960 } else {
961 dev_info(&instance->pdev->dev,
962 "raid->rowDataSize is 0, but has SPAN[0]"
963 "rowDataSize = 0x%0x,"
964 "but there is _NO_ UnevenSpanSupport\n",
965 MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize);
966 return FALSE;
967 }
968 }
969
970 stripSize = 1 << raid->stripeShift;
971 stripe_mask = stripSize-1;
972
973
974 /*
975 * calculate starting row and stripe, and number of strips and rows
976 */
977 start_strip = ldStartBlock >> raid->stripeShift;
978 ref_in_start_stripe = (u16)(ldStartBlock & stripe_mask);
979 endLba = ldStartBlock + numBlocks - 1;
980 ref_in_end_stripe = (u16)(endLba & stripe_mask);
981 endStrip = endLba >> raid->stripeShift;
982 num_strips = (u8)(endStrip - start_strip + 1); /* End strip */
983
984 if (io_info->IoforUnevenSpan) {
985 start_row = get_row_from_strip(instance, ld, start_strip, map);
986 endRow = get_row_from_strip(instance, ld, endStrip, map);
987 if (start_row == -1ULL || endRow == -1ULL) {
988 dev_info(&instance->pdev->dev, "return from %s %d."
989 "Send IO w/o region lock.\n",
990 __func__, __LINE__);
991 return FALSE;
992 }
993
994 if (raid->spanDepth == 1) {
995 startlba_span = 0;
996 *pdBlock = start_row << raid->stripeShift;
997 } else
998 startlba_span = (u8)mr_spanset_get_span_block(instance,
999 ld, start_row, pdBlock, map);
1000 if (startlba_span == SPAN_INVALID) {
1001 dev_info(&instance->pdev->dev, "return from %s %d"
1002 "for row 0x%llx,start strip %llx"
1003 "endSrip %llx\n", __func__, __LINE__,
1004 (unsigned long long)start_row,
1005 (unsigned long long)start_strip,
1006 (unsigned long long)endStrip);
1007 return FALSE;
1008 }
1009 io_info->start_span = startlba_span;
1010 io_info->start_row = start_row;
1011 } else {
1012 start_row = mega_div64_32(start_strip, raid->rowDataSize);
1013 endRow = mega_div64_32(endStrip, raid->rowDataSize);
1014 }
1015 numRows = (u8)(endRow - start_row + 1);
1016
1017 /*
1018 * calculate region info.
1019 */
1020
1021 /* assume region is at the start of the first row */
1022 regStart = start_row << raid->stripeShift;
1023 /* assume this IO needs the full row - we'll adjust if not true */
1024 regSize = stripSize;
1025
1026 io_info->do_fp_rlbypass = raid->capability.fpBypassRegionLock;
1027
1028 /* Check if we can send this I/O via FastPath */
1029 if (raid->capability.fpCapable) {
1030 if (isRead)
1031 io_info->fpOkForIo = (raid->capability.fpReadCapable &&
1032 ((num_strips == 1) ||
1033 raid->capability.
1034 fpReadAcrossStripe));
1035 else
1036 io_info->fpOkForIo = (raid->capability.fpWriteCapable &&
1037 ((num_strips == 1) ||
1038 raid->capability.
1039 fpWriteAcrossStripe));
1040 } else
1041 io_info->fpOkForIo = FALSE;
1042
1043 if (numRows == 1) {
1044 /* single-strip IOs can always lock only the data needed */
1045 if (num_strips == 1) {
1046 regStart += ref_in_start_stripe;
1047 regSize = numBlocks;
1048 }
1049 /* multi-strip IOs always need to full stripe locked */
1050 } else if (io_info->IoforUnevenSpan == 0) {
1051 /*
1052 * For Even span region lock optimization.
1053 * If the start strip is the last in the start row
1054 */
1055 if (start_strip == (start_row + 1) * raid->rowDataSize - 1) {
1056 regStart += ref_in_start_stripe;
1057 /* initialize count to sectors from startref to end
1058 of strip */
1059 regSize = stripSize - ref_in_start_stripe;
1060 }
1061
1062 /* add complete rows in the middle of the transfer */
1063 if (numRows > 2)
1064 regSize += (numRows-2) << raid->stripeShift;
1065
1066 /* if IO ends within first strip of last row*/
1067 if (endStrip == endRow*raid->rowDataSize)
1068 regSize += ref_in_end_stripe+1;
1069 else
1070 regSize += stripSize;
1071 } else {
1072 /*
1073 * For Uneven span region lock optimization.
1074 * If the start strip is the last in the start row
1075 */
1076 if (start_strip == (get_strip_from_row(instance, ld, start_row, map) +
1077 SPAN_ROW_DATA_SIZE(map, ld, startlba_span) - 1)) {
1078 regStart += ref_in_start_stripe;
1079 /* initialize count to sectors from
1080 * startRef to end of strip
1081 */
1082 regSize = stripSize - ref_in_start_stripe;
1083 }
1084 /* Add complete rows in the middle of the transfer*/
1085
1086 if (numRows > 2)
1087 /* Add complete rows in the middle of the transfer*/
1088 regSize += (numRows-2) << raid->stripeShift;
1089
1090 /* if IO ends within first strip of last row */
1091 if (endStrip == get_strip_from_row(instance, ld, endRow, map))
1092 regSize += ref_in_end_stripe + 1;
1093 else
1094 regSize += stripSize;
1095 }
1096
1097 pRAID_Context->timeout_value =
1098 cpu_to_le16(raid->fpIoTimeoutForLd ?
1099 raid->fpIoTimeoutForLd :
1100 map->raidMap.fpPdIoTimeoutSec);
1101 if (fusion->adapter_type == INVADER_SERIES)
1102 pRAID_Context->reg_lock_flags = (isRead) ?
1103 raid->regTypeReqOnRead : raid->regTypeReqOnWrite;
1104 else if (!instance->is_ventura)
1105 pRAID_Context->reg_lock_flags = (isRead) ?
1106 REGION_TYPE_SHARED_READ : raid->regTypeReqOnWrite;
1107 pRAID_Context->virtual_disk_tgt_id = raid->targetId;
1108 pRAID_Context->reg_lock_row_lba = cpu_to_le64(regStart);
1109 pRAID_Context->reg_lock_length = cpu_to_le32(regSize);
1110 pRAID_Context->config_seq_num = raid->seqNum;
1111 /* save pointer to raid->LUN array */
1112 *raidLUN = raid->LUN;
1113
1114
1115 /*Get Phy Params only if FP capable, or else leave it to MR firmware
1116 to do the calculation.*/
1117 if (io_info->fpOkForIo) {
1118 retval = io_info->IoforUnevenSpan ?
1119 mr_spanset_get_phy_params(instance, ld,
1120 start_strip, ref_in_start_stripe,
1121 io_info, pRAID_Context, map) :
1122 MR_GetPhyParams(instance, ld, start_strip,
1123 ref_in_start_stripe, io_info,
1124 pRAID_Context, map);
1125 /* If IO on an invalid Pd, then FP is not possible.*/
1126 if (io_info->devHandle == MR_DEVHANDLE_INVALID)
1127 io_info->fpOkForIo = FALSE;
1128 return retval;
1129 } else if (isRead) {
1130 uint stripIdx;
1131 for (stripIdx = 0; stripIdx < num_strips; stripIdx++) {
1132 retval = io_info->IoforUnevenSpan ?
1133 mr_spanset_get_phy_params(instance, ld,
1134 start_strip + stripIdx,
1135 ref_in_start_stripe, io_info,
1136 pRAID_Context, map) :
1137 MR_GetPhyParams(instance, ld,
1138 start_strip + stripIdx, ref_in_start_stripe,
1139 io_info, pRAID_Context, map);
1140 if (!retval)
1141 return TRUE;
1142 }
1143 }
1144 return TRUE;
1145 }
1146
1147 /*
1148 ******************************************************************************
1149 *
1150 * This routine pepare spanset info from Valid Raid map and store it into
1151 * local copy of ldSpanInfo per instance data structure.
1152 *
1153 * Inputs :
1154 * map - LD map
1155 * ldSpanInfo - ldSpanInfo per HBA instance
1156 *
1157 */
1158 void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
1159 PLD_SPAN_INFO ldSpanInfo)
1160 {
1161 u8 span, count;
1162 u32 element, span_row_width;
1163 u64 span_row;
1164 struct MR_LD_RAID *raid;
1165 LD_SPAN_SET *span_set, *span_set_prev;
1166 struct MR_QUAD_ELEMENT *quad;
1167 int ldCount;
1168 u16 ld;
1169
1170
1171 for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1172 ld = MR_TargetIdToLdGet(ldCount, map);
1173 if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
1174 continue;
1175 raid = MR_LdRaidGet(ld, map);
1176 for (element = 0; element < MAX_QUAD_DEPTH; element++) {
1177 for (span = 0; span < raid->spanDepth; span++) {
1178 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
1179 block_span_info.noElements) <
1180 element + 1)
1181 continue;
1182 span_set = &(ldSpanInfo[ld].span_set[element]);
1183 quad = &map->raidMap.ldSpanMap[ld].
1184 spanBlock[span].block_span_info.
1185 quad[element];
1186
1187 span_set->diff = le32_to_cpu(quad->diff);
1188
1189 for (count = 0, span_row_width = 0;
1190 count < raid->spanDepth; count++) {
1191 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].
1192 spanBlock[count].
1193 block_span_info.
1194 noElements) >= element + 1) {
1195 span_set->strip_offset[count] =
1196 span_row_width;
1197 span_row_width +=
1198 MR_LdSpanPtrGet
1199 (ld, count, map)->spanRowDataSize;
1200 }
1201 }
1202
1203 span_set->span_row_data_width = span_row_width;
1204 span_row = mega_div64_32(((le64_to_cpu(quad->logEnd) -
1205 le64_to_cpu(quad->logStart)) + le32_to_cpu(quad->diff)),
1206 le32_to_cpu(quad->diff));
1207
1208 if (element == 0) {
1209 span_set->log_start_lba = 0;
1210 span_set->log_end_lba =
1211 ((span_row << raid->stripeShift)
1212 * span_row_width) - 1;
1213
1214 span_set->span_row_start = 0;
1215 span_set->span_row_end = span_row - 1;
1216
1217 span_set->data_strip_start = 0;
1218 span_set->data_strip_end =
1219 (span_row * span_row_width) - 1;
1220
1221 span_set->data_row_start = 0;
1222 span_set->data_row_end =
1223 (span_row * le32_to_cpu(quad->diff)) - 1;
1224 } else {
1225 span_set_prev = &(ldSpanInfo[ld].
1226 span_set[element - 1]);
1227 span_set->log_start_lba =
1228 span_set_prev->log_end_lba + 1;
1229 span_set->log_end_lba =
1230 span_set->log_start_lba +
1231 ((span_row << raid->stripeShift)
1232 * span_row_width) - 1;
1233
1234 span_set->span_row_start =
1235 span_set_prev->span_row_end + 1;
1236 span_set->span_row_end =
1237 span_set->span_row_start + span_row - 1;
1238
1239 span_set->data_strip_start =
1240 span_set_prev->data_strip_end + 1;
1241 span_set->data_strip_end =
1242 span_set->data_strip_start +
1243 (span_row * span_row_width) - 1;
1244
1245 span_set->data_row_start =
1246 span_set_prev->data_row_end + 1;
1247 span_set->data_row_end =
1248 span_set->data_row_start +
1249 (span_row * le32_to_cpu(quad->diff)) - 1;
1250 }
1251 break;
1252 }
1253 if (span == raid->spanDepth)
1254 break;
1255 }
1256 }
1257 }
1258
1259 void mr_update_load_balance_params(struct MR_DRV_RAID_MAP_ALL *drv_map,
1260 struct LD_LOAD_BALANCE_INFO *lbInfo)
1261 {
1262 int ldCount;
1263 u16 ld;
1264 struct MR_LD_RAID *raid;
1265
1266 if (lb_pending_cmds > 128 || lb_pending_cmds < 1)
1267 lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
1268
1269 for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1270 ld = MR_TargetIdToLdGet(ldCount, drv_map);
1271 if (ld >= MAX_LOGICAL_DRIVES_EXT) {
1272 lbInfo[ldCount].loadBalanceFlag = 0;
1273 continue;
1274 }
1275
1276 raid = MR_LdRaidGet(ld, drv_map);
1277 if ((raid->level != 1) ||
1278 (raid->ldState != MR_LD_STATE_OPTIMAL)) {
1279 lbInfo[ldCount].loadBalanceFlag = 0;
1280 continue;
1281 }
1282 lbInfo[ldCount].loadBalanceFlag = 1;
1283 }
1284 }
1285
1286 u8 megasas_get_best_arm_pd(struct megasas_instance *instance,
1287 struct LD_LOAD_BALANCE_INFO *lbInfo,
1288 struct IO_REQUEST_INFO *io_info,
1289 struct MR_DRV_RAID_MAP_ALL *drv_map)
1290 {
1291 struct MR_LD_RAID *raid;
1292 u16 pd1_dev_handle;
1293 u16 pend0, pend1, ld;
1294 u64 diff0, diff1;
1295 u8 bestArm, pd0, pd1, span, arm;
1296 u32 arRef, span_row_size;
1297
1298 u64 block = io_info->ldStartBlock;
1299 u32 count = io_info->numBlocks;
1300
1301 span = ((io_info->span_arm & RAID_CTX_SPANARM_SPAN_MASK)
1302 >> RAID_CTX_SPANARM_SPAN_SHIFT);
1303 arm = (io_info->span_arm & RAID_CTX_SPANARM_ARM_MASK);
1304
1305 ld = MR_TargetIdToLdGet(io_info->ldTgtId, drv_map);
1306 raid = MR_LdRaidGet(ld, drv_map);
1307 span_row_size = instance->UnevenSpanSupport ?
1308 SPAN_ROW_SIZE(drv_map, ld, span) : raid->rowSize;
1309
1310 arRef = MR_LdSpanArrayGet(ld, span, drv_map);
1311 pd0 = MR_ArPdGet(arRef, arm, drv_map);
1312 pd1 = MR_ArPdGet(arRef, (arm + 1) >= span_row_size ?
1313 (arm + 1 - span_row_size) : arm + 1, drv_map);
1314
1315 /* Get PD1 Dev Handle */
1316
1317 pd1_dev_handle = MR_PdDevHandleGet(pd1, drv_map);
1318
1319 if (pd1_dev_handle == MR_DEVHANDLE_INVALID) {
1320 bestArm = arm;
1321 } else {
1322 /* get the pending cmds for the data and mirror arms */
1323 pend0 = atomic_read(&lbInfo->scsi_pending_cmds[pd0]);
1324 pend1 = atomic_read(&lbInfo->scsi_pending_cmds[pd1]);
1325
1326 /* Determine the disk whose head is nearer to the req. block */
1327 diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[pd0]);
1328 diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[pd1]);
1329 bestArm = (diff0 <= diff1 ? arm : arm ^ 1);
1330
1331 /* Make balance count from 16 to 4 to
1332 * keep driver in sync with Firmware
1333 */
1334 if ((bestArm == arm && pend0 > pend1 + lb_pending_cmds) ||
1335 (bestArm != arm && pend1 > pend0 + lb_pending_cmds))
1336 bestArm ^= 1;
1337
1338 /* Update the last accessed block on the correct pd */
1339 io_info->span_arm =
1340 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | bestArm;
1341 io_info->pd_after_lb = (bestArm == arm) ? pd0 : pd1;
1342 }
1343
1344 lbInfo->last_accessed_block[io_info->pd_after_lb] = block + count - 1;
1345 return io_info->pd_after_lb;
1346 }
1347
1348 __le16 get_updated_dev_handle(struct megasas_instance *instance,
1349 struct LD_LOAD_BALANCE_INFO *lbInfo,
1350 struct IO_REQUEST_INFO *io_info,
1351 struct MR_DRV_RAID_MAP_ALL *drv_map)
1352 {
1353 u8 arm_pd;
1354 __le16 devHandle;
1355
1356 /* get best new arm (PD ID) */
1357 arm_pd = megasas_get_best_arm_pd(instance, lbInfo, io_info, drv_map);
1358 devHandle = MR_PdDevHandleGet(arm_pd, drv_map);
1359 io_info->pd_interface = MR_PdInterfaceTypeGet(arm_pd, drv_map);
1360 atomic_inc(&lbInfo->scsi_pending_cmds[arm_pd]);
1361
1362 return devHandle;
1363 }
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