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9c915a8c AR |
1 | /* |
2 | * Linux MegaRAID driver for SAS based RAID controllers | |
3 | * | |
ae59057b | 4 | * Copyright (c) 2009-2012 LSI Corporation. |
9c915a8c AR |
5 | * |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version 2 | |
9 | * of the License, or (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | * FILE: megaraid_sas_fp.c | |
21 | * | |
22 | * Authors: LSI Corporation | |
23 | * Sumant Patro | |
24 | * Varad Talamacki | |
25 | * Manoj Jose | |
26 | * | |
27 | * Send feedback to: <megaraidlinux@lsi.com> | |
28 | * | |
29 | * Mail to: LSI Corporation, 1621 Barber Lane, Milpitas, CA 95035 | |
30 | * ATTN: Linuxraid | |
31 | */ | |
32 | ||
33 | #include <linux/kernel.h> | |
34 | #include <linux/types.h> | |
35 | #include <linux/pci.h> | |
36 | #include <linux/list.h> | |
37 | #include <linux/moduleparam.h> | |
38 | #include <linux/module.h> | |
39 | #include <linux/spinlock.h> | |
40 | #include <linux/interrupt.h> | |
41 | #include <linux/delay.h> | |
9c915a8c AR |
42 | #include <linux/uio.h> |
43 | #include <linux/uaccess.h> | |
44 | #include <linux/fs.h> | |
45 | #include <linux/compat.h> | |
46 | #include <linux/blkdev.h> | |
47 | #include <linux/poll.h> | |
48 | ||
49 | #include <scsi/scsi.h> | |
50 | #include <scsi/scsi_cmnd.h> | |
51 | #include <scsi/scsi_device.h> | |
52 | #include <scsi/scsi_host.h> | |
53 | ||
54 | #include "megaraid_sas_fusion.h" | |
36807e67 | 55 | #include "megaraid_sas.h" |
9c915a8c AR |
56 | #include <asm/div64.h> |
57 | ||
58 | #define ABS_DIFF(a, b) (((a) > (b)) ? ((a) - (b)) : ((b) - (a))) | |
59 | #define MR_LD_STATE_OPTIMAL 3 | |
60 | #define FALSE 0 | |
61 | #define TRUE 1 | |
62 | ||
63 | /* Prototypes */ | |
64 | void | |
65 | mr_update_load_balance_params(struct MR_FW_RAID_MAP_ALL *map, | |
66 | struct LD_LOAD_BALANCE_INFO *lbInfo); | |
67 | ||
68 | u32 mega_mod64(u64 dividend, u32 divisor) | |
69 | { | |
70 | u64 d; | |
71 | u32 remainder; | |
72 | ||
73 | if (!divisor) | |
74 | printk(KERN_ERR "megasas : DIVISOR is zero, in div fn\n"); | |
75 | d = dividend; | |
76 | remainder = do_div(d, divisor); | |
77 | return remainder; | |
78 | } | |
79 | ||
80 | /** | |
81 | * @param dividend : Dividend | |
82 | * @param divisor : Divisor | |
83 | * | |
84 | * @return quotient | |
85 | **/ | |
86 | u64 mega_div64_32(uint64_t dividend, uint32_t divisor) | |
87 | { | |
88 | u32 remainder; | |
89 | u64 d; | |
90 | ||
91 | if (!divisor) | |
92 | printk(KERN_ERR "megasas : DIVISOR is zero in mod fn\n"); | |
93 | ||
94 | d = dividend; | |
95 | remainder = do_div(d, divisor); | |
96 | ||
97 | return d; | |
98 | } | |
99 | ||
100 | struct MR_LD_RAID *MR_LdRaidGet(u32 ld, struct MR_FW_RAID_MAP_ALL *map) | |
101 | { | |
102 | return &map->raidMap.ldSpanMap[ld].ldRaid; | |
103 | } | |
104 | ||
105 | static struct MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld, | |
106 | struct MR_FW_RAID_MAP_ALL | |
107 | *map) | |
108 | { | |
109 | return &map->raidMap.ldSpanMap[ld].spanBlock[0]; | |
110 | } | |
111 | ||
112 | static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, struct MR_FW_RAID_MAP_ALL *map) | |
113 | { | |
114 | return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx]; | |
115 | } | |
116 | ||
117 | static u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_FW_RAID_MAP_ALL *map) | |
118 | { | |
119 | return map->raidMap.arMapInfo[ar].pd[arm]; | |
120 | } | |
121 | ||
122 | static u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_FW_RAID_MAP_ALL *map) | |
123 | { | |
124 | return map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef; | |
125 | } | |
126 | ||
127 | static u16 MR_PdDevHandleGet(u32 pd, struct MR_FW_RAID_MAP_ALL *map) | |
128 | { | |
129 | return map->raidMap.devHndlInfo[pd].curDevHdl; | |
130 | } | |
131 | ||
132 | u16 MR_GetLDTgtId(u32 ld, struct MR_FW_RAID_MAP_ALL *map) | |
133 | { | |
134 | return map->raidMap.ldSpanMap[ld].ldRaid.targetId; | |
135 | } | |
136 | ||
137 | u16 MR_TargetIdToLdGet(u32 ldTgtId, struct MR_FW_RAID_MAP_ALL *map) | |
138 | { | |
139 | return map->raidMap.ldTgtIdToLd[ldTgtId]; | |
140 | } | |
141 | ||
142 | static struct MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span, | |
143 | struct MR_FW_RAID_MAP_ALL *map) | |
144 | { | |
145 | return &map->raidMap.ldSpanMap[ld].spanBlock[span].span; | |
146 | } | |
147 | ||
148 | /* | |
149 | * This function will validate Map info data provided by FW | |
150 | */ | |
151 | u8 MR_ValidateMapInfo(struct MR_FW_RAID_MAP_ALL *map, | |
152 | struct LD_LOAD_BALANCE_INFO *lbInfo) | |
153 | { | |
154 | struct MR_FW_RAID_MAP *pFwRaidMap = &map->raidMap; | |
155 | ||
156 | if (pFwRaidMap->totalSize != | |
157 | (sizeof(struct MR_FW_RAID_MAP) -sizeof(struct MR_LD_SPAN_MAP) + | |
158 | (sizeof(struct MR_LD_SPAN_MAP) *pFwRaidMap->ldCount))) { | |
159 | printk(KERN_ERR "megasas: map info structure size 0x%x is not matching with ld count\n", | |
160 | (unsigned int)((sizeof(struct MR_FW_RAID_MAP) - | |
161 | sizeof(struct MR_LD_SPAN_MAP)) + | |
162 | (sizeof(struct MR_LD_SPAN_MAP) * | |
163 | pFwRaidMap->ldCount))); | |
164 | printk(KERN_ERR "megasas: span map %x, pFwRaidMap->totalSize " | |
165 | ": %x\n", (unsigned int)sizeof(struct MR_LD_SPAN_MAP), | |
166 | pFwRaidMap->totalSize); | |
167 | return 0; | |
168 | } | |
169 | ||
170 | mr_update_load_balance_params(map, lbInfo); | |
171 | ||
172 | return 1; | |
173 | } | |
174 | ||
175 | u32 MR_GetSpanBlock(u32 ld, u64 row, u64 *span_blk, | |
176 | struct MR_FW_RAID_MAP_ALL *map, int *div_error) | |
177 | { | |
178 | struct MR_SPAN_BLOCK_INFO *pSpanBlock = MR_LdSpanInfoGet(ld, map); | |
179 | struct MR_QUAD_ELEMENT *quad; | |
180 | struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); | |
181 | u32 span, j; | |
182 | ||
183 | for (span = 0; span < raid->spanDepth; span++, pSpanBlock++) { | |
184 | ||
185 | for (j = 0; j < pSpanBlock->block_span_info.noElements; j++) { | |
186 | quad = &pSpanBlock->block_span_info.quad[j]; | |
187 | ||
188 | if (quad->diff == 0) { | |
189 | *div_error = 1; | |
190 | return span; | |
191 | } | |
192 | if (quad->logStart <= row && row <= quad->logEnd && | |
193 | (mega_mod64(row-quad->logStart, quad->diff)) == 0) { | |
194 | if (span_blk != NULL) { | |
195 | u64 blk, debugBlk; | |
196 | blk = | |
197 | mega_div64_32( | |
198 | (row-quad->logStart), | |
199 | quad->diff); | |
200 | debugBlk = blk; | |
201 | ||
202 | blk = (blk + quad->offsetInSpan) << | |
203 | raid->stripeShift; | |
204 | *span_blk = blk; | |
205 | } | |
206 | return span; | |
207 | } | |
208 | } | |
209 | } | |
210 | return span; | |
211 | } | |
212 | ||
213 | /* | |
214 | ****************************************************************************** | |
215 | * | |
216 | * This routine calculates the arm, span and block for the specified stripe and | |
217 | * reference in stripe. | |
218 | * | |
219 | * Inputs : | |
220 | * | |
221 | * ld - Logical drive number | |
222 | * stripRow - Stripe number | |
223 | * stripRef - Reference in stripe | |
224 | * | |
225 | * Outputs : | |
226 | * | |
227 | * span - Span number | |
228 | * block - Absolute Block number in the physical disk | |
229 | */ | |
36807e67 AR |
230 | u8 MR_GetPhyParams(struct megasas_instance *instance, u32 ld, u64 stripRow, |
231 | u16 stripRef, u64 *pdBlock, u16 *pDevHandle, | |
232 | struct RAID_CONTEXT *pRAID_Context, | |
9c915a8c AR |
233 | struct MR_FW_RAID_MAP_ALL *map) |
234 | { | |
235 | struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); | |
236 | u32 pd, arRef; | |
237 | u8 physArm, span; | |
238 | u64 row; | |
239 | u8 retval = TRUE; | |
240 | int error_code = 0; | |
21d3c710 SS |
241 | u8 do_invader = 0; |
242 | ||
243 | if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER || | |
244 | instance->pdev->device == PCI_DEVICE_ID_LSI_FURY)) | |
245 | do_invader = 1; | |
9c915a8c AR |
246 | |
247 | row = mega_div64_32(stripRow, raid->rowDataSize); | |
248 | ||
249 | if (raid->level == 6) { | |
250 | /* logical arm within row */ | |
251 | u32 logArm = mega_mod64(stripRow, raid->rowDataSize); | |
252 | u32 rowMod, armQ, arm; | |
253 | ||
254 | if (raid->rowSize == 0) | |
255 | return FALSE; | |
256 | /* get logical row mod */ | |
257 | rowMod = mega_mod64(row, raid->rowSize); | |
258 | armQ = raid->rowSize-1-rowMod; /* index of Q drive */ | |
259 | arm = armQ+1+logArm; /* data always logically follows Q */ | |
260 | if (arm >= raid->rowSize) /* handle wrap condition */ | |
261 | arm -= raid->rowSize; | |
262 | physArm = (u8)arm; | |
263 | } else { | |
264 | if (raid->modFactor == 0) | |
265 | return FALSE; | |
266 | physArm = MR_LdDataArmGet(ld, mega_mod64(stripRow, | |
267 | raid->modFactor), | |
268 | map); | |
269 | } | |
270 | ||
271 | if (raid->spanDepth == 1) { | |
272 | span = 0; | |
273 | *pdBlock = row << raid->stripeShift; | |
274 | } else { | |
275 | span = (u8)MR_GetSpanBlock(ld, row, pdBlock, map, &error_code); | |
276 | if (error_code == 1) | |
277 | return FALSE; | |
278 | } | |
279 | ||
280 | /* Get the array on which this span is present */ | |
281 | arRef = MR_LdSpanArrayGet(ld, span, map); | |
282 | pd = MR_ArPdGet(arRef, physArm, map); /* Get the pd */ | |
283 | ||
284 | if (pd != MR_PD_INVALID) | |
285 | /* Get dev handle from Pd. */ | |
286 | *pDevHandle = MR_PdDevHandleGet(pd, map); | |
287 | else { | |
288 | *pDevHandle = MR_PD_INVALID; /* set dev handle as invalid. */ | |
36807e67 | 289 | if ((raid->level >= 5) && |
21d3c710 SS |
290 | (!do_invader || (do_invader && |
291 | (raid->regTypeReqOnRead != REGION_TYPE_UNUSED)))) | |
9c915a8c AR |
292 | pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE; |
293 | else if (raid->level == 1) { | |
294 | /* Get alternate Pd. */ | |
295 | pd = MR_ArPdGet(arRef, physArm + 1, map); | |
296 | if (pd != MR_PD_INVALID) | |
297 | /* Get dev handle from Pd */ | |
298 | *pDevHandle = MR_PdDevHandleGet(pd, map); | |
299 | } | |
9c915a8c AR |
300 | } |
301 | ||
302 | *pdBlock += stripRef + MR_LdSpanPtrGet(ld, span, map)->startBlk; | |
303 | pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) | | |
304 | physArm; | |
305 | return retval; | |
306 | } | |
307 | ||
308 | /* | |
309 | ****************************************************************************** | |
310 | * | |
311 | * MR_BuildRaidContext function | |
312 | * | |
313 | * This function will initiate command processing. The start/end row and strip | |
314 | * information is calculated then the lock is acquired. | |
315 | * This function will return 0 if region lock was acquired OR return num strips | |
316 | */ | |
317 | u8 | |
36807e67 AR |
318 | MR_BuildRaidContext(struct megasas_instance *instance, |
319 | struct IO_REQUEST_INFO *io_info, | |
9c915a8c AR |
320 | struct RAID_CONTEXT *pRAID_Context, |
321 | struct MR_FW_RAID_MAP_ALL *map) | |
322 | { | |
323 | struct MR_LD_RAID *raid; | |
324 | u32 ld, stripSize, stripe_mask; | |
325 | u64 endLba, endStrip, endRow, start_row, start_strip; | |
326 | u64 regStart; | |
327 | u32 regSize; | |
328 | u8 num_strips, numRows; | |
329 | u16 ref_in_start_stripe, ref_in_end_stripe; | |
330 | u64 ldStartBlock; | |
331 | u32 numBlocks, ldTgtId; | |
332 | u8 isRead; | |
333 | u8 retval = 0; | |
334 | ||
335 | ldStartBlock = io_info->ldStartBlock; | |
336 | numBlocks = io_info->numBlocks; | |
337 | ldTgtId = io_info->ldTgtId; | |
338 | isRead = io_info->isRead; | |
339 | ||
340 | ld = MR_TargetIdToLdGet(ldTgtId, map); | |
341 | raid = MR_LdRaidGet(ld, map); | |
342 | ||
343 | stripSize = 1 << raid->stripeShift; | |
344 | stripe_mask = stripSize-1; | |
345 | /* | |
346 | * calculate starting row and stripe, and number of strips and rows | |
347 | */ | |
348 | start_strip = ldStartBlock >> raid->stripeShift; | |
349 | ref_in_start_stripe = (u16)(ldStartBlock & stripe_mask); | |
350 | endLba = ldStartBlock + numBlocks - 1; | |
351 | ref_in_end_stripe = (u16)(endLba & stripe_mask); | |
352 | endStrip = endLba >> raid->stripeShift; | |
353 | num_strips = (u8)(endStrip - start_strip + 1); /* End strip */ | |
354 | if (raid->rowDataSize == 0) | |
355 | return FALSE; | |
356 | start_row = mega_div64_32(start_strip, raid->rowDataSize); | |
357 | endRow = mega_div64_32(endStrip, raid->rowDataSize); | |
358 | numRows = (u8)(endRow - start_row + 1); | |
359 | ||
360 | /* | |
361 | * calculate region info. | |
362 | */ | |
363 | ||
364 | /* assume region is at the start of the first row */ | |
365 | regStart = start_row << raid->stripeShift; | |
366 | /* assume this IO needs the full row - we'll adjust if not true */ | |
367 | regSize = stripSize; | |
368 | ||
c1529fa2 AR |
369 | /* Check if we can send this I/O via FastPath */ |
370 | if (raid->capability.fpCapable) { | |
371 | if (isRead) | |
372 | io_info->fpOkForIo = (raid->capability.fpReadCapable && | |
373 | ((num_strips == 1) || | |
374 | raid->capability. | |
375 | fpReadAcrossStripe)); | |
376 | else | |
377 | io_info->fpOkForIo = (raid->capability.fpWriteCapable && | |
378 | ((num_strips == 1) || | |
379 | raid->capability. | |
380 | fpWriteAcrossStripe)); | |
381 | } else | |
9c915a8c | 382 | io_info->fpOkForIo = FALSE; |
9c915a8c AR |
383 | |
384 | if (numRows == 1) { | |
385 | /* single-strip IOs can always lock only the data needed */ | |
386 | if (num_strips == 1) { | |
387 | regStart += ref_in_start_stripe; | |
388 | regSize = numBlocks; | |
389 | } | |
390 | /* multi-strip IOs always need to full stripe locked */ | |
391 | } else { | |
392 | if (start_strip == (start_row + 1) * raid->rowDataSize - 1) { | |
393 | /* If the start strip is the last in the start row */ | |
394 | regStart += ref_in_start_stripe; | |
395 | regSize = stripSize - ref_in_start_stripe; | |
396 | /* initialize count to sectors from startref to end | |
397 | of strip */ | |
398 | } | |
399 | ||
400 | if (numRows > 2) | |
401 | /* Add complete rows in the middle of the transfer */ | |
402 | regSize += (numRows-2) << raid->stripeShift; | |
403 | ||
404 | /* if IO ends within first strip of last row */ | |
405 | if (endStrip == endRow*raid->rowDataSize) | |
406 | regSize += ref_in_end_stripe+1; | |
407 | else | |
408 | regSize += stripSize; | |
409 | } | |
410 | ||
411 | pRAID_Context->timeoutValue = map->raidMap.fpPdIoTimeoutSec; | |
21d3c710 SS |
412 | if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER) || |
413 | (instance->pdev->device == PCI_DEVICE_ID_LSI_FURY)) | |
36807e67 AR |
414 | pRAID_Context->regLockFlags = (isRead) ? |
415 | raid->regTypeReqOnRead : raid->regTypeReqOnWrite; | |
416 | else | |
417 | pRAID_Context->regLockFlags = (isRead) ? | |
418 | REGION_TYPE_SHARED_READ : raid->regTypeReqOnWrite; | |
9c915a8c AR |
419 | pRAID_Context->VirtualDiskTgtId = raid->targetId; |
420 | pRAID_Context->regLockRowLBA = regStart; | |
421 | pRAID_Context->regLockLength = regSize; | |
422 | pRAID_Context->configSeqNum = raid->seqNum; | |
423 | ||
424 | /*Get Phy Params only if FP capable, or else leave it to MR firmware | |
425 | to do the calculation.*/ | |
426 | if (io_info->fpOkForIo) { | |
36807e67 AR |
427 | retval = MR_GetPhyParams(instance, ld, start_strip, |
428 | ref_in_start_stripe, | |
9c915a8c AR |
429 | &io_info->pdBlock, |
430 | &io_info->devHandle, pRAID_Context, | |
431 | map); | |
432 | /* If IO on an invalid Pd, then FP i snot possible */ | |
433 | if (io_info->devHandle == MR_PD_INVALID) | |
434 | io_info->fpOkForIo = FALSE; | |
435 | return retval; | |
436 | } else if (isRead) { | |
437 | uint stripIdx; | |
438 | for (stripIdx = 0; stripIdx < num_strips; stripIdx++) { | |
36807e67 AR |
439 | if (!MR_GetPhyParams(instance, ld, |
440 | start_strip + stripIdx, | |
9c915a8c AR |
441 | ref_in_start_stripe, |
442 | &io_info->pdBlock, | |
443 | &io_info->devHandle, | |
444 | pRAID_Context, map)) | |
445 | return TRUE; | |
446 | } | |
447 | } | |
448 | return TRUE; | |
449 | } | |
450 | ||
451 | void | |
452 | mr_update_load_balance_params(struct MR_FW_RAID_MAP_ALL *map, | |
453 | struct LD_LOAD_BALANCE_INFO *lbInfo) | |
454 | { | |
455 | int ldCount; | |
456 | u16 ld; | |
457 | struct MR_LD_RAID *raid; | |
458 | ||
459 | for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES; ldCount++) { | |
460 | ld = MR_TargetIdToLdGet(ldCount, map); | |
461 | if (ld >= MAX_LOGICAL_DRIVES) { | |
462 | lbInfo[ldCount].loadBalanceFlag = 0; | |
463 | continue; | |
464 | } | |
465 | ||
466 | raid = MR_LdRaidGet(ld, map); | |
467 | ||
468 | /* Two drive Optimal RAID 1 */ | |
469 | if ((raid->level == 1) && (raid->rowSize == 2) && | |
470 | (raid->spanDepth == 1) && raid->ldState == | |
471 | MR_LD_STATE_OPTIMAL) { | |
472 | u32 pd, arRef; | |
473 | ||
474 | lbInfo[ldCount].loadBalanceFlag = 1; | |
475 | ||
476 | /* Get the array on which this span is present */ | |
477 | arRef = MR_LdSpanArrayGet(ld, 0, map); | |
478 | ||
479 | /* Get the Pd */ | |
480 | pd = MR_ArPdGet(arRef, 0, map); | |
481 | /* Get dev handle from Pd */ | |
482 | lbInfo[ldCount].raid1DevHandle[0] = | |
483 | MR_PdDevHandleGet(pd, map); | |
484 | /* Get the Pd */ | |
485 | pd = MR_ArPdGet(arRef, 1, map); | |
486 | ||
487 | /* Get the dev handle from Pd */ | |
488 | lbInfo[ldCount].raid1DevHandle[1] = | |
489 | MR_PdDevHandleGet(pd, map); | |
490 | } else | |
491 | lbInfo[ldCount].loadBalanceFlag = 0; | |
492 | } | |
493 | } | |
494 | ||
495 | u8 megasas_get_best_arm(struct LD_LOAD_BALANCE_INFO *lbInfo, u8 arm, u64 block, | |
496 | u32 count) | |
497 | { | |
498 | u16 pend0, pend1; | |
499 | u64 diff0, diff1; | |
500 | u8 bestArm; | |
501 | ||
502 | /* get the pending cmds for the data and mirror arms */ | |
503 | pend0 = atomic_read(&lbInfo->scsi_pending_cmds[0]); | |
504 | pend1 = atomic_read(&lbInfo->scsi_pending_cmds[1]); | |
505 | ||
506 | /* Determine the disk whose head is nearer to the req. block */ | |
507 | diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[0]); | |
508 | diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[1]); | |
509 | bestArm = (diff0 <= diff1 ? 0 : 1); | |
510 | ||
70b47b88 SS |
511 | /*Make balance count from 16 to 4 to keep driver in sync with Firmware*/ |
512 | if ((bestArm == arm && pend0 > pend1 + 4) || | |
513 | (bestArm != arm && pend1 > pend0 + 4)) | |
9c915a8c AR |
514 | bestArm ^= 1; |
515 | ||
516 | /* Update the last accessed block on the correct pd */ | |
517 | lbInfo->last_accessed_block[bestArm] = block + count - 1; | |
518 | ||
519 | return bestArm; | |
520 | } | |
521 | ||
522 | u16 get_updated_dev_handle(struct LD_LOAD_BALANCE_INFO *lbInfo, | |
523 | struct IO_REQUEST_INFO *io_info) | |
524 | { | |
525 | u8 arm, old_arm; | |
526 | u16 devHandle; | |
527 | ||
528 | old_arm = lbInfo->raid1DevHandle[0] == io_info->devHandle ? 0 : 1; | |
529 | ||
530 | /* get best new arm */ | |
531 | arm = megasas_get_best_arm(lbInfo, old_arm, io_info->ldStartBlock, | |
532 | io_info->numBlocks); | |
533 | devHandle = lbInfo->raid1DevHandle[arm]; | |
534 | atomic_inc(&lbInfo->scsi_pending_cmds[arm]); | |
535 | ||
536 | return devHandle; | |
537 | } |