1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Linux MegaRAID driver for SAS based RAID controllers
5 * Copyright (c) 2009-2013 LSI Corporation
6 * Copyright (c) 2013-2016 Avago Technologies
7 * Copyright (c) 2016-2018 Broadcom Inc.
9 * FILE: megaraid_sas_fp.c
11 * Authors: Broadcom Inc.
15 * Kashyap Desai <kashyap.desai@broadcom.com>
16 * Sumit Saxena <sumit.saxena@broadcom.com>
18 * Send feedback to: megaraidlinux.pdl@broadcom.com
21 #include <linux/kernel.h>
22 #include <linux/types.h>
23 #include <linux/pci.h>
24 #include <linux/list.h>
25 #include <linux/moduleparam.h>
26 #include <linux/module.h>
27 #include <linux/spinlock.h>
28 #include <linux/interrupt.h>
29 #include <linux/delay.h>
30 #include <linux/uio.h>
31 #include <linux/uaccess.h>
33 #include <linux/compat.h>
34 #include <linux/blkdev.h>
35 #include <linux/poll.h>
36 #include <linux/irq_poll.h>
38 #include <scsi/scsi.h>
39 #include <scsi/scsi_cmnd.h>
40 #include <scsi/scsi_device.h>
41 #include <scsi/scsi_host.h>
43 #include "megaraid_sas_fusion.h"
44 #include "megaraid_sas.h"
45 #include <asm/div64.h>
47 #define LB_PENDING_CMDS_DEFAULT 4
48 static unsigned int lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
49 module_param(lb_pending_cmds, int, 0444);
50 MODULE_PARM_DESC(lb_pending_cmds, "Change raid-1 load balancing outstanding "
51 "threshold. Valid Values are 1-128. Default: 4");
54 #define ABS_DIFF(a, b) (((a) > (b)) ? ((a) - (b)) : ((b) - (a)))
55 #define MR_LD_STATE_OPTIMAL 3
57 #define SPAN_ROW_SIZE(map, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowSize)
58 #define SPAN_ROW_DATA_SIZE(map_, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowDataSize)
59 #define SPAN_INVALID 0xff
62 static void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
63 PLD_SPAN_INFO ldSpanInfo);
64 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
65 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
66 struct RAID_CONTEXT *pRAID_Context, struct MR_DRV_RAID_MAP_ALL *map);
67 static u64 get_row_from_strip(struct megasas_instance *instance, u32 ld,
68 u64 strip, struct MR_DRV_RAID_MAP_ALL *map);
70 u32 mega_mod64(u64 dividend, u32 divisor)
76 printk(KERN_ERR "megasas : DIVISOR is zero, in div fn\n");
78 remainder = do_div(d, divisor);
83 * mega_div64_32 - Do a 64-bit division
89 static u64 mega_div64_32(uint64_t dividend, uint32_t divisor)
94 printk(KERN_ERR "megasas : DIVISOR is zero in mod fn\n");
101 struct MR_LD_RAID *MR_LdRaidGet(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
103 return &map->raidMap.ldSpanMap[ld].ldRaid;
106 static struct MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld,
107 struct MR_DRV_RAID_MAP_ALL
110 return &map->raidMap.ldSpanMap[ld].spanBlock[0];
113 static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, struct MR_DRV_RAID_MAP_ALL *map)
115 return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx];
118 u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_DRV_RAID_MAP_ALL *map)
120 return le16_to_cpu(map->raidMap.arMapInfo[ar].pd[arm]);
123 u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_DRV_RAID_MAP_ALL *map)
125 return le16_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef);
128 __le16 MR_PdDevHandleGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
130 return map->raidMap.devHndlInfo[pd].curDevHdl;
133 static u8 MR_PdInterfaceTypeGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
135 return map->raidMap.devHndlInfo[pd].interfaceType;
138 u16 MR_GetLDTgtId(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
140 return le16_to_cpu(map->raidMap.ldSpanMap[ld].ldRaid.targetId);
143 u16 MR_TargetIdToLdGet(u32 ldTgtId, struct MR_DRV_RAID_MAP_ALL *map)
145 return map->raidMap.ldTgtIdToLd[ldTgtId];
148 static struct MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span,
149 struct MR_DRV_RAID_MAP_ALL *map)
151 return &map->raidMap.ldSpanMap[ld].spanBlock[span].span;
155 * This function will Populate Driver Map using firmware raid map
157 static int MR_PopulateDrvRaidMap(struct megasas_instance *instance, u64 map_id)
159 struct fusion_context *fusion = instance->ctrl_context;
160 struct MR_FW_RAID_MAP_ALL *fw_map_old = NULL;
161 struct MR_FW_RAID_MAP *pFwRaidMap = NULL;
164 struct MR_FW_RAID_MAP_DYNAMIC *fw_map_dyn;
165 struct MR_FW_RAID_MAP_EXT *fw_map_ext;
166 struct MR_RAID_MAP_DESC_TABLE *desc_table;
169 struct MR_DRV_RAID_MAP_ALL *drv_map =
170 fusion->ld_drv_map[(map_id & 1)];
171 struct MR_DRV_RAID_MAP *pDrvRaidMap = &drv_map->raidMap;
172 void *raid_map_data = NULL;
174 memset(drv_map, 0, fusion->drv_map_sz);
175 memset(pDrvRaidMap->ldTgtIdToLd,
176 0xff, (sizeof(u16) * MAX_LOGICAL_DRIVES_DYN));
178 if (instance->max_raid_mapsize) {
179 fw_map_dyn = fusion->ld_map[(map_id & 1)];
181 (struct MR_RAID_MAP_DESC_TABLE *)((void *)fw_map_dyn + le32_to_cpu(fw_map_dyn->desc_table_offset));
182 if (desc_table != fw_map_dyn->raid_map_desc_table)
183 dev_dbg(&instance->pdev->dev, "offsets of desc table are not matching desc %p original %p\n",
184 desc_table, fw_map_dyn->raid_map_desc_table);
186 ld_count = (u16)le16_to_cpu(fw_map_dyn->ld_count);
187 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
188 pDrvRaidMap->fpPdIoTimeoutSec =
189 fw_map_dyn->fp_pd_io_timeout_sec;
190 pDrvRaidMap->totalSize =
191 cpu_to_le32(sizeof(struct MR_DRV_RAID_MAP_ALL));
192 /* point to actual data starting point*/
193 raid_map_data = (void *)fw_map_dyn +
194 le32_to_cpu(fw_map_dyn->desc_table_offset) +
195 le32_to_cpu(fw_map_dyn->desc_table_size);
197 for (i = 0; i < le32_to_cpu(fw_map_dyn->desc_table_num_elements); ++i) {
198 switch (le32_to_cpu(desc_table->raid_map_desc_type)) {
199 case RAID_MAP_DESC_TYPE_DEVHDL_INFO:
200 fw_map_dyn->dev_hndl_info =
201 (struct MR_DEV_HANDLE_INFO *)(raid_map_data + le32_to_cpu(desc_table->raid_map_desc_offset));
202 memcpy(pDrvRaidMap->devHndlInfo,
203 fw_map_dyn->dev_hndl_info,
204 sizeof(struct MR_DEV_HANDLE_INFO) *
205 le32_to_cpu(desc_table->raid_map_desc_elements));
207 case RAID_MAP_DESC_TYPE_TGTID_INFO:
208 fw_map_dyn->ld_tgt_id_to_ld =
209 (u16 *)(raid_map_data +
210 le32_to_cpu(desc_table->raid_map_desc_offset));
211 for (j = 0; j < le32_to_cpu(desc_table->raid_map_desc_elements); j++) {
212 pDrvRaidMap->ldTgtIdToLd[j] =
213 le16_to_cpu(fw_map_dyn->ld_tgt_id_to_ld[j]);
216 case RAID_MAP_DESC_TYPE_ARRAY_INFO:
217 fw_map_dyn->ar_map_info =
218 (struct MR_ARRAY_INFO *)
219 (raid_map_data + le32_to_cpu(desc_table->raid_map_desc_offset));
220 memcpy(pDrvRaidMap->arMapInfo,
221 fw_map_dyn->ar_map_info,
222 sizeof(struct MR_ARRAY_INFO) *
223 le32_to_cpu(desc_table->raid_map_desc_elements));
225 case RAID_MAP_DESC_TYPE_SPAN_INFO:
226 fw_map_dyn->ld_span_map =
227 (struct MR_LD_SPAN_MAP *)
229 le32_to_cpu(desc_table->raid_map_desc_offset));
230 memcpy(pDrvRaidMap->ldSpanMap,
231 fw_map_dyn->ld_span_map,
232 sizeof(struct MR_LD_SPAN_MAP) *
233 le32_to_cpu(desc_table->raid_map_desc_elements));
236 dev_dbg(&instance->pdev->dev, "wrong number of desctableElements %d\n",
237 fw_map_dyn->desc_table_num_elements);
242 } else if (instance->supportmax256vd) {
244 (struct MR_FW_RAID_MAP_EXT *)fusion->ld_map[(map_id & 1)];
245 ld_count = (u16)le16_to_cpu(fw_map_ext->ldCount);
246 if (ld_count > MAX_LOGICAL_DRIVES_EXT) {
247 dev_dbg(&instance->pdev->dev, "megaraid_sas: LD count exposed in RAID map in not valid\n");
251 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
252 pDrvRaidMap->fpPdIoTimeoutSec = fw_map_ext->fpPdIoTimeoutSec;
253 for (i = 0; i < (MAX_LOGICAL_DRIVES_EXT); i++)
254 pDrvRaidMap->ldTgtIdToLd[i] =
255 (u16)fw_map_ext->ldTgtIdToLd[i];
256 memcpy(pDrvRaidMap->ldSpanMap, fw_map_ext->ldSpanMap,
257 sizeof(struct MR_LD_SPAN_MAP) * ld_count);
258 memcpy(pDrvRaidMap->arMapInfo, fw_map_ext->arMapInfo,
259 sizeof(struct MR_ARRAY_INFO) * MAX_API_ARRAYS_EXT);
260 memcpy(pDrvRaidMap->devHndlInfo, fw_map_ext->devHndlInfo,
261 sizeof(struct MR_DEV_HANDLE_INFO) *
262 MAX_RAIDMAP_PHYSICAL_DEVICES);
264 /* New Raid map will not set totalSize, so keep expected value
265 * for legacy code in ValidateMapInfo
267 pDrvRaidMap->totalSize =
268 cpu_to_le32(sizeof(struct MR_FW_RAID_MAP_EXT));
270 fw_map_old = (struct MR_FW_RAID_MAP_ALL *)
271 fusion->ld_map[(map_id & 1)];
272 pFwRaidMap = &fw_map_old->raidMap;
273 ld_count = (u16)le32_to_cpu(pFwRaidMap->ldCount);
274 if (ld_count > MAX_LOGICAL_DRIVES) {
275 dev_dbg(&instance->pdev->dev,
276 "LD count exposed in RAID map in not valid\n");
280 pDrvRaidMap->totalSize = pFwRaidMap->totalSize;
281 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
282 pDrvRaidMap->fpPdIoTimeoutSec = pFwRaidMap->fpPdIoTimeoutSec;
283 for (i = 0; i < MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS; i++)
284 pDrvRaidMap->ldTgtIdToLd[i] =
285 (u8)pFwRaidMap->ldTgtIdToLd[i];
286 for (i = 0; i < ld_count; i++) {
287 pDrvRaidMap->ldSpanMap[i] = pFwRaidMap->ldSpanMap[i];
289 memcpy(pDrvRaidMap->arMapInfo, pFwRaidMap->arMapInfo,
290 sizeof(struct MR_ARRAY_INFO) * MAX_RAIDMAP_ARRAYS);
291 memcpy(pDrvRaidMap->devHndlInfo, pFwRaidMap->devHndlInfo,
292 sizeof(struct MR_DEV_HANDLE_INFO) *
293 MAX_RAIDMAP_PHYSICAL_DEVICES);
300 * This function will validate Map info data provided by FW
302 u8 MR_ValidateMapInfo(struct megasas_instance *instance, u64 map_id)
304 struct fusion_context *fusion;
305 struct MR_DRV_RAID_MAP_ALL *drv_map;
306 struct MR_DRV_RAID_MAP *pDrvRaidMap;
307 struct LD_LOAD_BALANCE_INFO *lbInfo;
308 PLD_SPAN_INFO ldSpanInfo;
309 struct MR_LD_RAID *raid;
314 if (MR_PopulateDrvRaidMap(instance, map_id))
317 fusion = instance->ctrl_context;
318 drv_map = fusion->ld_drv_map[(map_id & 1)];
319 pDrvRaidMap = &drv_map->raidMap;
321 lbInfo = fusion->load_balance_info;
322 ldSpanInfo = fusion->log_to_span;
324 if (instance->max_raid_mapsize)
325 expected_size = sizeof(struct MR_DRV_RAID_MAP_ALL);
326 else if (instance->supportmax256vd)
327 expected_size = sizeof(struct MR_FW_RAID_MAP_EXT);
329 expected_size = struct_size_t(struct MR_FW_RAID_MAP,
331 le16_to_cpu(pDrvRaidMap->ldCount));
333 if (le32_to_cpu(pDrvRaidMap->totalSize) != expected_size) {
334 dev_dbg(&instance->pdev->dev, "megasas: map info structure size 0x%x",
335 le32_to_cpu(pDrvRaidMap->totalSize));
336 dev_dbg(&instance->pdev->dev, "is not matching expected size 0x%x\n",
337 (unsigned int)expected_size);
338 dev_err(&instance->pdev->dev, "megasas: span map %x, pDrvRaidMap->totalSize : %x\n",
339 (unsigned int)sizeof(struct MR_LD_SPAN_MAP),
340 le32_to_cpu(pDrvRaidMap->totalSize));
344 if (instance->UnevenSpanSupport)
345 mr_update_span_set(drv_map, ldSpanInfo);
348 mr_update_load_balance_params(drv_map, lbInfo);
350 num_lds = le16_to_cpu(drv_map->raidMap.ldCount);
352 memcpy(instance->ld_ids_prev,
353 instance->ld_ids_from_raidmap,
354 sizeof(instance->ld_ids_from_raidmap));
355 memset(instance->ld_ids_from_raidmap, 0xff, MEGASAS_MAX_LD_IDS);
356 /*Convert Raid capability values to CPU arch */
357 for (i = 0; (num_lds > 0) && (i < MAX_LOGICAL_DRIVES_EXT); i++) {
358 ld = MR_TargetIdToLdGet(i, drv_map);
360 /* For non existing VDs, iterate to next VD*/
361 if (ld >= MEGASAS_MAX_SUPPORTED_LD_IDS)
364 raid = MR_LdRaidGet(ld, drv_map);
365 le32_to_cpus((u32 *)&raid->capability);
366 instance->ld_ids_from_raidmap[i] = i;
373 static u32 MR_GetSpanBlock(u32 ld, u64 row, u64 *span_blk,
374 struct MR_DRV_RAID_MAP_ALL *map)
376 struct MR_SPAN_BLOCK_INFO *pSpanBlock = MR_LdSpanInfoGet(ld, map);
377 struct MR_QUAD_ELEMENT *quad;
378 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
381 for (span = 0; span < raid->spanDepth; span++, pSpanBlock++) {
383 for (j = 0; j < le32_to_cpu(pSpanBlock->block_span_info.noElements); j++) {
384 quad = &pSpanBlock->block_span_info.quad[j];
386 if (le32_to_cpu(quad->diff) == 0)
388 if (le64_to_cpu(quad->logStart) <= row && row <=
389 le64_to_cpu(quad->logEnd) && (mega_mod64(row - le64_to_cpu(quad->logStart),
390 le32_to_cpu(quad->diff))) == 0) {
391 if (span_blk != NULL) {
393 blk = mega_div64_32((row-le64_to_cpu(quad->logStart)), le32_to_cpu(quad->diff));
395 blk = (blk + le64_to_cpu(quad->offsetInSpan)) << raid->stripeShift;
406 ******************************************************************************
408 * This routine calculates the Span block for given row using spanset.
411 * instance - HBA instance
412 * ld - Logical drive number
419 * block - Absolute Block number in the physical disk
420 * div_error - Devide error code.
423 static u32 mr_spanset_get_span_block(struct megasas_instance *instance,
424 u32 ld, u64 row, u64 *span_blk, struct MR_DRV_RAID_MAP_ALL *map)
426 struct fusion_context *fusion = instance->ctrl_context;
427 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
428 LD_SPAN_SET *span_set;
429 struct MR_QUAD_ELEMENT *quad;
431 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
433 for (info = 0; info < MAX_QUAD_DEPTH; info++) {
434 span_set = &(ldSpanInfo[ld].span_set[info]);
436 if (span_set->span_row_data_width == 0)
439 if (row > span_set->data_row_end)
442 for (span = 0; span < raid->spanDepth; span++)
443 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
444 block_span_info.noElements) >= info+1) {
445 quad = &map->raidMap.ldSpanMap[ld].
447 block_span_info.quad[info];
448 if (le32_to_cpu(quad->diff) == 0)
450 if (le64_to_cpu(quad->logStart) <= row &&
451 row <= le64_to_cpu(quad->logEnd) &&
452 (mega_mod64(row - le64_to_cpu(quad->logStart),
453 le32_to_cpu(quad->diff))) == 0) {
454 if (span_blk != NULL) {
457 ((row - le64_to_cpu(quad->logStart)),
458 le32_to_cpu(quad->diff));
459 blk = (blk + le64_to_cpu(quad->offsetInSpan))
460 << raid->stripeShift;
471 ******************************************************************************
473 * This routine calculates the row for given strip using spanset.
476 * instance - HBA instance
477 * ld - Logical drive number
483 * row - row associated with strip
486 static u64 get_row_from_strip(struct megasas_instance *instance,
487 u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
489 struct fusion_context *fusion = instance->ctrl_context;
490 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
491 LD_SPAN_SET *span_set;
492 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
493 u32 info, strip_offset, span, span_offset;
494 u64 span_set_Strip, span_set_Row, retval;
496 for (info = 0; info < MAX_QUAD_DEPTH; info++) {
497 span_set = &(ldSpanInfo[ld].span_set[info]);
499 if (span_set->span_row_data_width == 0)
501 if (strip > span_set->data_strip_end)
504 span_set_Strip = strip - span_set->data_strip_start;
505 strip_offset = mega_mod64(span_set_Strip,
506 span_set->span_row_data_width);
507 span_set_Row = mega_div64_32(span_set_Strip,
508 span_set->span_row_data_width) * span_set->diff;
509 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
510 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
511 block_span_info.noElements) >= info+1) {
513 span_set->strip_offset[span])
519 retval = (span_set->data_row_start + span_set_Row +
528 ******************************************************************************
530 * This routine calculates the Start Strip for given row using spanset.
533 * instance - HBA instance
534 * ld - Logical drive number
540 * Strip - Start strip associated with row
543 static u64 get_strip_from_row(struct megasas_instance *instance,
544 u32 ld, u64 row, struct MR_DRV_RAID_MAP_ALL *map)
546 struct fusion_context *fusion = instance->ctrl_context;
547 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
548 LD_SPAN_SET *span_set;
549 struct MR_QUAD_ELEMENT *quad;
550 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
554 for (info = 0; info < MAX_QUAD_DEPTH; info++) {
555 span_set = &(ldSpanInfo[ld].span_set[info]);
557 if (span_set->span_row_data_width == 0)
559 if (row > span_set->data_row_end)
562 for (span = 0; span < raid->spanDepth; span++)
563 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
564 block_span_info.noElements) >= info+1) {
565 quad = &map->raidMap.ldSpanMap[ld].
566 spanBlock[span].block_span_info.quad[info];
567 if (le64_to_cpu(quad->logStart) <= row &&
568 row <= le64_to_cpu(quad->logEnd) &&
569 mega_mod64((row - le64_to_cpu(quad->logStart)),
570 le32_to_cpu(quad->diff)) == 0) {
571 strip = mega_div64_32
572 (((row - span_set->data_row_start)
573 - le64_to_cpu(quad->logStart)),
574 le32_to_cpu(quad->diff));
575 strip *= span_set->span_row_data_width;
576 strip += span_set->data_strip_start;
577 strip += span_set->strip_offset[span];
582 dev_err(&instance->pdev->dev, "get_strip_from_row"
583 "returns invalid strip for ld=%x, row=%lx\n",
584 ld, (long unsigned int)row);
589 ******************************************************************************
591 * This routine calculates the Physical Arm for given strip using spanset.
594 * instance - HBA instance
595 * ld - Logical drive number
601 * Phys Arm - Phys Arm associated with strip
604 static u32 get_arm_from_strip(struct megasas_instance *instance,
605 u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
607 struct fusion_context *fusion = instance->ctrl_context;
608 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
609 LD_SPAN_SET *span_set;
610 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
611 u32 info, strip_offset, span, span_offset, retval;
613 for (info = 0 ; info < MAX_QUAD_DEPTH; info++) {
614 span_set = &(ldSpanInfo[ld].span_set[info]);
616 if (span_set->span_row_data_width == 0)
618 if (strip > span_set->data_strip_end)
621 strip_offset = (uint)mega_mod64
622 ((strip - span_set->data_strip_start),
623 span_set->span_row_data_width);
625 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
626 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
627 block_span_info.noElements) >= info+1) {
629 span_set->strip_offset[span])
631 span_set->strip_offset[span];
636 retval = (strip_offset - span_offset);
640 dev_err(&instance->pdev->dev, "get_arm_from_strip"
641 "returns invalid arm for ld=%x strip=%lx\n",
642 ld, (long unsigned int)strip);
647 /* This Function will return Phys arm */
648 static u8 get_arm(struct megasas_instance *instance, u32 ld, u8 span, u64 stripe,
649 struct MR_DRV_RAID_MAP_ALL *map)
651 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
652 /* Need to check correct default value */
655 switch (raid->level) {
659 arm = mega_mod64(stripe, SPAN_ROW_SIZE(map, ld, span));
662 /* start with logical arm */
663 arm = get_arm_from_strip(instance, ld, stripe, map);
674 ******************************************************************************
676 * This routine calculates the arm, span and block for the specified stripe and
677 * reference in stripe using spanset
681 * ld - Logical drive number
682 * stripRow - Stripe number
683 * stripRef - Reference in stripe
688 * block - Absolute Block number in the physical disk
690 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
691 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
692 struct RAID_CONTEXT *pRAID_Context,
693 struct MR_DRV_RAID_MAP_ALL *map)
695 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
696 u32 pd, arRef, r1_alt_pd;
700 u64 *pdBlock = &io_info->pdBlock;
701 __le16 *pDevHandle = &io_info->devHandle;
702 u8 *pPdInterface = &io_info->pd_interface;
703 u32 logArm, rowMod, armQ, arm;
705 *pDevHandle = cpu_to_le16(MR_DEVHANDLE_INVALID);
707 /*Get row and span from io_info for Uneven Span IO.*/
708 row = io_info->start_row;
709 span = io_info->start_span;
712 if (raid->level == 6) {
713 logArm = get_arm_from_strip(instance, ld, stripRow, map);
716 rowMod = mega_mod64(row, SPAN_ROW_SIZE(map, ld, span));
717 armQ = SPAN_ROW_SIZE(map, ld, span) - 1 - rowMod;
718 arm = armQ + 1 + logArm;
719 if (arm >= SPAN_ROW_SIZE(map, ld, span))
720 arm -= SPAN_ROW_SIZE(map, ld, span);
723 /* Calculate the arm */
724 physArm = get_arm(instance, ld, span, stripRow, map);
728 arRef = MR_LdSpanArrayGet(ld, span, map);
729 pd = MR_ArPdGet(arRef, physArm, map);
731 if (pd != MR_PD_INVALID) {
732 *pDevHandle = MR_PdDevHandleGet(pd, map);
733 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
734 /* get second pd also for raid 1/10 fast path writes*/
735 if ((instance->adapter_type >= VENTURA_SERIES) &&
736 (raid->level == 1) &&
738 r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map);
739 if (r1_alt_pd != MR_PD_INVALID)
740 io_info->r1_alt_dev_handle =
741 MR_PdDevHandleGet(r1_alt_pd, map);
744 if ((raid->level >= 5) &&
745 ((instance->adapter_type == THUNDERBOLT_SERIES) ||
746 ((instance->adapter_type == INVADER_SERIES) &&
747 (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
748 pRAID_Context->reg_lock_flags = REGION_TYPE_EXCLUSIVE;
749 else if (raid->level == 1) {
750 physArm = physArm + 1;
751 pd = MR_ArPdGet(arRef, physArm, map);
752 if (pd != MR_PD_INVALID) {
753 *pDevHandle = MR_PdDevHandleGet(pd, map);
754 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
759 *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
760 if (instance->adapter_type >= VENTURA_SERIES) {
761 ((struct RAID_CONTEXT_G35 *)pRAID_Context)->span_arm =
762 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
764 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
766 pRAID_Context->span_arm =
767 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
768 io_info->span_arm = pRAID_Context->span_arm;
770 io_info->pd_after_lb = pd;
775 ******************************************************************************
777 * This routine calculates the arm, span and block for the specified stripe and
778 * reference in stripe.
782 * ld - Logical drive number
783 * stripRow - Stripe number
784 * stripRef - Reference in stripe
789 * block - Absolute Block number in the physical disk
791 static u8 MR_GetPhyParams(struct megasas_instance *instance, u32 ld, u64 stripRow,
792 u16 stripRef, struct IO_REQUEST_INFO *io_info,
793 struct RAID_CONTEXT *pRAID_Context,
794 struct MR_DRV_RAID_MAP_ALL *map)
796 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
797 u32 pd, arRef, r1_alt_pd;
801 u64 *pdBlock = &io_info->pdBlock;
802 __le16 *pDevHandle = &io_info->devHandle;
803 u8 *pPdInterface = &io_info->pd_interface;
805 *pDevHandle = cpu_to_le16(MR_DEVHANDLE_INVALID);
807 row = mega_div64_32(stripRow, raid->rowDataSize);
809 if (raid->level == 6) {
810 /* logical arm within row */
811 u32 logArm = mega_mod64(stripRow, raid->rowDataSize);
812 u32 rowMod, armQ, arm;
814 if (raid->rowSize == 0)
816 /* get logical row mod */
817 rowMod = mega_mod64(row, raid->rowSize);
818 armQ = raid->rowSize-1-rowMod; /* index of Q drive */
819 arm = armQ+1+logArm; /* data always logically follows Q */
820 if (arm >= raid->rowSize) /* handle wrap condition */
821 arm -= raid->rowSize;
824 if (raid->modFactor == 0)
826 physArm = MR_LdDataArmGet(ld, mega_mod64(stripRow,
831 if (raid->spanDepth == 1) {
833 *pdBlock = row << raid->stripeShift;
835 span = (u8)MR_GetSpanBlock(ld, row, pdBlock, map);
836 if (span == SPAN_INVALID)
840 /* Get the array on which this span is present */
841 arRef = MR_LdSpanArrayGet(ld, span, map);
842 pd = MR_ArPdGet(arRef, physArm, map); /* Get the pd */
844 if (pd != MR_PD_INVALID) {
845 /* Get dev handle from Pd. */
846 *pDevHandle = MR_PdDevHandleGet(pd, map);
847 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
848 /* get second pd also for raid 1/10 fast path writes*/
849 if ((instance->adapter_type >= VENTURA_SERIES) &&
850 (raid->level == 1) &&
852 r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map);
853 if (r1_alt_pd != MR_PD_INVALID)
854 io_info->r1_alt_dev_handle =
855 MR_PdDevHandleGet(r1_alt_pd, map);
858 if ((raid->level >= 5) &&
859 ((instance->adapter_type == THUNDERBOLT_SERIES) ||
860 ((instance->adapter_type == INVADER_SERIES) &&
861 (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
862 pRAID_Context->reg_lock_flags = REGION_TYPE_EXCLUSIVE;
863 else if (raid->level == 1) {
864 /* Get alternate Pd. */
865 physArm = physArm + 1;
866 pd = MR_ArPdGet(arRef, physArm, map);
867 if (pd != MR_PD_INVALID) {
868 /* Get dev handle from Pd */
869 *pDevHandle = MR_PdDevHandleGet(pd, map);
870 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
875 *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
876 if (instance->adapter_type >= VENTURA_SERIES) {
877 ((struct RAID_CONTEXT_G35 *)pRAID_Context)->span_arm =
878 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
880 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
882 pRAID_Context->span_arm =
883 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
884 io_info->span_arm = pRAID_Context->span_arm;
886 io_info->pd_after_lb = pd;
891 * mr_get_phy_params_r56_rmw - Calculate parameters for R56 CTIO write operation
892 * @instance: Adapter soft state
894 * @stripNo: Strip Number
895 * @io_info: IO info structure pointer
896 * pRAID_Context: RAID context pointer
897 * map: RAID map pointer
899 * This routine calculates the logical arm, data Arm, row number and parity arm
900 * for R56 CTIO write operation.
902 static void mr_get_phy_params_r56_rmw(struct megasas_instance *instance,
904 struct IO_REQUEST_INFO *io_info,
905 struct RAID_CONTEXT_G35 *pRAID_Context,
906 struct MR_DRV_RAID_MAP_ALL *map)
908 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
909 u8 span, dataArms, arms, dataArm, logArm;
910 s8 rightmostParityArm, PParityArm;
912 u64 *pdBlock = &io_info->pdBlock;
914 dataArms = raid->rowDataSize;
915 arms = raid->rowSize;
917 rowNum = mega_div64_32(stripNo, dataArms);
918 /* parity disk arm, first arm is 0 */
919 rightmostParityArm = (arms - 1) - mega_mod64(rowNum, arms);
921 /* logical arm within row */
922 logArm = mega_mod64(stripNo, dataArms);
923 /* physical arm for data */
924 dataArm = mega_mod64((rightmostParityArm + 1 + logArm), arms);
926 if (raid->spanDepth == 1) {
929 span = (u8)MR_GetSpanBlock(ld, rowNum, pdBlock, map);
930 if (span == SPAN_INVALID)
934 if (raid->level == 6) {
935 /* P Parity arm, note this can go negative adjust if negative */
936 PParityArm = (arms - 2) - mega_mod64(rowNum, arms);
941 /* rightmostParityArm is P-Parity for RAID 5 and Q-Parity for RAID */
942 pRAID_Context->flow_specific.r56_arm_map = rightmostParityArm;
943 pRAID_Context->flow_specific.r56_arm_map |=
944 (u16)(PParityArm << RAID_CTX_R56_P_ARM_SHIFT);
946 pRAID_Context->flow_specific.r56_arm_map |=
947 (u16)(rightmostParityArm << RAID_CTX_R56_P_ARM_SHIFT);
950 pRAID_Context->reg_lock_row_lba = cpu_to_le64(rowNum);
951 pRAID_Context->flow_specific.r56_arm_map |=
952 (u16)(logArm << RAID_CTX_R56_LOG_ARM_SHIFT);
953 cpu_to_le16s(&pRAID_Context->flow_specific.r56_arm_map);
954 pRAID_Context->span_arm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) | dataArm;
955 pRAID_Context->raid_flags = (MR_RAID_FLAGS_IO_SUB_TYPE_R56_DIV_OFFLOAD <<
956 MR_RAID_CTX_RAID_FLAGS_IO_SUB_TYPE_SHIFT);
962 ******************************************************************************
964 * MR_BuildRaidContext function
966 * This function will initiate command processing. The start/end row and strip
967 * information is calculated then the lock is acquired.
968 * This function will return 0 if region lock was acquired OR return num strips
971 MR_BuildRaidContext(struct megasas_instance *instance,
972 struct IO_REQUEST_INFO *io_info,
973 struct RAID_CONTEXT *pRAID_Context,
974 struct MR_DRV_RAID_MAP_ALL *map, u8 **raidLUN)
976 struct fusion_context *fusion;
977 struct MR_LD_RAID *raid;
978 u32 stripSize, stripe_mask;
979 u64 endLba, endStrip, endRow, start_row, start_strip;
982 u8 num_strips, numRows;
983 u16 ref_in_start_stripe, ref_in_end_stripe;
985 u32 numBlocks, ldTgtId;
988 u8 startlba_span = SPAN_INVALID;
989 u64 *pdBlock = &io_info->pdBlock;
992 ldStartBlock = io_info->ldStartBlock;
993 numBlocks = io_info->numBlocks;
994 ldTgtId = io_info->ldTgtId;
995 isRead = io_info->isRead;
996 io_info->IoforUnevenSpan = 0;
997 io_info->start_span = SPAN_INVALID;
998 fusion = instance->ctrl_context;
1000 ld = MR_TargetIdToLdGet(ldTgtId, map);
1001 raid = MR_LdRaidGet(ld, map);
1002 /*check read ahead bit*/
1003 io_info->ra_capable = raid->capability.ra_capable;
1006 * if rowDataSize @RAID map and spanRowDataSize @SPAN INFO are zero
1009 if (raid->rowDataSize == 0) {
1010 if (MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize == 0)
1012 else if (instance->UnevenSpanSupport) {
1013 io_info->IoforUnevenSpan = 1;
1015 dev_info(&instance->pdev->dev,
1016 "raid->rowDataSize is 0, but has SPAN[0]"
1017 "rowDataSize = 0x%0x,"
1018 "but there is _NO_ UnevenSpanSupport\n",
1019 MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize);
1024 stripSize = 1 << raid->stripeShift;
1025 stripe_mask = stripSize-1;
1027 io_info->data_arms = raid->rowDataSize;
1030 * calculate starting row and stripe, and number of strips and rows
1032 start_strip = ldStartBlock >> raid->stripeShift;
1033 ref_in_start_stripe = (u16)(ldStartBlock & stripe_mask);
1034 endLba = ldStartBlock + numBlocks - 1;
1035 ref_in_end_stripe = (u16)(endLba & stripe_mask);
1036 endStrip = endLba >> raid->stripeShift;
1037 num_strips = (u8)(endStrip - start_strip + 1); /* End strip */
1039 if (io_info->IoforUnevenSpan) {
1040 start_row = get_row_from_strip(instance, ld, start_strip, map);
1041 endRow = get_row_from_strip(instance, ld, endStrip, map);
1042 if (start_row == -1ULL || endRow == -1ULL) {
1043 dev_info(&instance->pdev->dev, "return from %s %d."
1044 "Send IO w/o region lock.\n",
1045 __func__, __LINE__);
1049 if (raid->spanDepth == 1) {
1051 *pdBlock = start_row << raid->stripeShift;
1053 startlba_span = (u8)mr_spanset_get_span_block(instance,
1054 ld, start_row, pdBlock, map);
1055 if (startlba_span == SPAN_INVALID) {
1056 dev_info(&instance->pdev->dev, "return from %s %d"
1057 "for row 0x%llx,start strip %llx"
1058 "endSrip %llx\n", __func__, __LINE__,
1059 (unsigned long long)start_row,
1060 (unsigned long long)start_strip,
1061 (unsigned long long)endStrip);
1064 io_info->start_span = startlba_span;
1065 io_info->start_row = start_row;
1067 start_row = mega_div64_32(start_strip, raid->rowDataSize);
1068 endRow = mega_div64_32(endStrip, raid->rowDataSize);
1070 numRows = (u8)(endRow - start_row + 1);
1073 * calculate region info.
1076 /* assume region is at the start of the first row */
1077 regStart = start_row << raid->stripeShift;
1078 /* assume this IO needs the full row - we'll adjust if not true */
1079 regSize = stripSize;
1081 io_info->do_fp_rlbypass = raid->capability.fpBypassRegionLock;
1083 /* Check if we can send this I/O via FastPath */
1084 if (raid->capability.fpCapable) {
1086 io_info->fpOkForIo = (raid->capability.fpReadCapable &&
1087 ((num_strips == 1) ||
1089 fpReadAcrossStripe));
1091 io_info->fpOkForIo = (raid->capability.fpWriteCapable &&
1092 ((num_strips == 1) ||
1094 fpWriteAcrossStripe));
1096 io_info->fpOkForIo = false;
1099 /* single-strip IOs can always lock only the data needed */
1100 if (num_strips == 1) {
1101 regStart += ref_in_start_stripe;
1102 regSize = numBlocks;
1104 /* multi-strip IOs always need to full stripe locked */
1105 } else if (io_info->IoforUnevenSpan == 0) {
1107 * For Even span region lock optimization.
1108 * If the start strip is the last in the start row
1110 if (start_strip == (start_row + 1) * raid->rowDataSize - 1) {
1111 regStart += ref_in_start_stripe;
1112 /* initialize count to sectors from startref to end
1114 regSize = stripSize - ref_in_start_stripe;
1117 /* add complete rows in the middle of the transfer */
1119 regSize += (numRows-2) << raid->stripeShift;
1121 /* if IO ends within first strip of last row*/
1122 if (endStrip == endRow*raid->rowDataSize)
1123 regSize += ref_in_end_stripe+1;
1125 regSize += stripSize;
1128 * For Uneven span region lock optimization.
1129 * If the start strip is the last in the start row
1131 if (start_strip == (get_strip_from_row(instance, ld, start_row, map) +
1132 SPAN_ROW_DATA_SIZE(map, ld, startlba_span) - 1)) {
1133 regStart += ref_in_start_stripe;
1134 /* initialize count to sectors from
1135 * startRef to end of strip
1137 regSize = stripSize - ref_in_start_stripe;
1139 /* Add complete rows in the middle of the transfer*/
1142 /* Add complete rows in the middle of the transfer*/
1143 regSize += (numRows-2) << raid->stripeShift;
1145 /* if IO ends within first strip of last row */
1146 if (endStrip == get_strip_from_row(instance, ld, endRow, map))
1147 regSize += ref_in_end_stripe + 1;
1149 regSize += stripSize;
1152 pRAID_Context->timeout_value =
1153 cpu_to_le16(raid->fpIoTimeoutForLd ?
1154 raid->fpIoTimeoutForLd :
1155 map->raidMap.fpPdIoTimeoutSec);
1156 if (instance->adapter_type == INVADER_SERIES)
1157 pRAID_Context->reg_lock_flags = (isRead) ?
1158 raid->regTypeReqOnRead : raid->regTypeReqOnWrite;
1159 else if (instance->adapter_type == THUNDERBOLT_SERIES)
1160 pRAID_Context->reg_lock_flags = (isRead) ?
1161 REGION_TYPE_SHARED_READ : raid->regTypeReqOnWrite;
1162 pRAID_Context->virtual_disk_tgt_id = raid->targetId;
1163 pRAID_Context->reg_lock_row_lba = cpu_to_le64(regStart);
1164 pRAID_Context->reg_lock_length = cpu_to_le32(regSize);
1165 pRAID_Context->config_seq_num = raid->seqNum;
1166 /* save pointer to raid->LUN array */
1167 *raidLUN = raid->LUN;
1169 /* Aero R5/6 Division Offload for WRITE */
1170 if (fusion->r56_div_offload && (raid->level >= 5) && !isRead) {
1171 mr_get_phy_params_r56_rmw(instance, ld, start_strip, io_info,
1172 (struct RAID_CONTEXT_G35 *)pRAID_Context,
1177 /*Get Phy Params only if FP capable, or else leave it to MR firmware
1178 to do the calculation.*/
1179 if (io_info->fpOkForIo) {
1180 retval = io_info->IoforUnevenSpan ?
1181 mr_spanset_get_phy_params(instance, ld,
1182 start_strip, ref_in_start_stripe,
1183 io_info, pRAID_Context, map) :
1184 MR_GetPhyParams(instance, ld, start_strip,
1185 ref_in_start_stripe, io_info,
1186 pRAID_Context, map);
1187 /* If IO on an invalid Pd, then FP is not possible.*/
1188 if (io_info->devHandle == MR_DEVHANDLE_INVALID)
1189 io_info->fpOkForIo = false;
1191 } else if (isRead) {
1193 for (stripIdx = 0; stripIdx < num_strips; stripIdx++) {
1194 retval = io_info->IoforUnevenSpan ?
1195 mr_spanset_get_phy_params(instance, ld,
1196 start_strip + stripIdx,
1197 ref_in_start_stripe, io_info,
1198 pRAID_Context, map) :
1199 MR_GetPhyParams(instance, ld,
1200 start_strip + stripIdx, ref_in_start_stripe,
1201 io_info, pRAID_Context, map);
1210 ******************************************************************************
1212 * This routine pepare spanset info from Valid Raid map and store it into
1213 * local copy of ldSpanInfo per instance data structure.
1217 * ldSpanInfo - ldSpanInfo per HBA instance
1220 void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
1221 PLD_SPAN_INFO ldSpanInfo)
1224 u32 element, span_row_width;
1226 struct MR_LD_RAID *raid;
1227 LD_SPAN_SET *span_set, *span_set_prev;
1228 struct MR_QUAD_ELEMENT *quad;
1233 for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1234 ld = MR_TargetIdToLdGet(ldCount, map);
1235 if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
1237 raid = MR_LdRaidGet(ld, map);
1238 for (element = 0; element < MAX_QUAD_DEPTH; element++) {
1239 for (span = 0; span < raid->spanDepth; span++) {
1240 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
1241 block_span_info.noElements) <
1244 span_set = &(ldSpanInfo[ld].span_set[element]);
1245 quad = &map->raidMap.ldSpanMap[ld].
1246 spanBlock[span].block_span_info.
1249 span_set->diff = le32_to_cpu(quad->diff);
1251 for (count = 0, span_row_width = 0;
1252 count < raid->spanDepth; count++) {
1253 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].
1256 noElements) >= element + 1) {
1257 span_set->strip_offset[count] =
1261 (ld, count, map)->spanRowDataSize;
1265 span_set->span_row_data_width = span_row_width;
1266 span_row = mega_div64_32(((le64_to_cpu(quad->logEnd) -
1267 le64_to_cpu(quad->logStart)) + le32_to_cpu(quad->diff)),
1268 le32_to_cpu(quad->diff));
1271 span_set->log_start_lba = 0;
1272 span_set->log_end_lba =
1273 ((span_row << raid->stripeShift)
1274 * span_row_width) - 1;
1276 span_set->span_row_start = 0;
1277 span_set->span_row_end = span_row - 1;
1279 span_set->data_strip_start = 0;
1280 span_set->data_strip_end =
1281 (span_row * span_row_width) - 1;
1283 span_set->data_row_start = 0;
1284 span_set->data_row_end =
1285 (span_row * le32_to_cpu(quad->diff)) - 1;
1287 span_set_prev = &(ldSpanInfo[ld].
1288 span_set[element - 1]);
1289 span_set->log_start_lba =
1290 span_set_prev->log_end_lba + 1;
1291 span_set->log_end_lba =
1292 span_set->log_start_lba +
1293 ((span_row << raid->stripeShift)
1294 * span_row_width) - 1;
1296 span_set->span_row_start =
1297 span_set_prev->span_row_end + 1;
1298 span_set->span_row_end =
1299 span_set->span_row_start + span_row - 1;
1301 span_set->data_strip_start =
1302 span_set_prev->data_strip_end + 1;
1303 span_set->data_strip_end =
1304 span_set->data_strip_start +
1305 (span_row * span_row_width) - 1;
1307 span_set->data_row_start =
1308 span_set_prev->data_row_end + 1;
1309 span_set->data_row_end =
1310 span_set->data_row_start +
1311 (span_row * le32_to_cpu(quad->diff)) - 1;
1315 if (span == raid->spanDepth)
1321 void mr_update_load_balance_params(struct MR_DRV_RAID_MAP_ALL *drv_map,
1322 struct LD_LOAD_BALANCE_INFO *lbInfo)
1326 struct MR_LD_RAID *raid;
1328 if (lb_pending_cmds > 128 || lb_pending_cmds < 1)
1329 lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
1331 for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1332 ld = MR_TargetIdToLdGet(ldCount, drv_map);
1333 if (ld >= MAX_LOGICAL_DRIVES_EXT - 1) {
1334 lbInfo[ldCount].loadBalanceFlag = 0;
1338 raid = MR_LdRaidGet(ld, drv_map);
1339 if ((raid->level != 1) ||
1340 (raid->ldState != MR_LD_STATE_OPTIMAL)) {
1341 lbInfo[ldCount].loadBalanceFlag = 0;
1344 lbInfo[ldCount].loadBalanceFlag = 1;
1348 static u8 megasas_get_best_arm_pd(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)
1353 struct MR_LD_RAID *raid;
1355 u16 pend0, pend1, ld;
1357 u8 bestArm, pd0, pd1, span, arm;
1358 u32 arRef, span_row_size;
1360 u64 block = io_info->ldStartBlock;
1361 u32 count = io_info->numBlocks;
1363 span = ((io_info->span_arm & RAID_CTX_SPANARM_SPAN_MASK)
1364 >> RAID_CTX_SPANARM_SPAN_SHIFT);
1365 arm = (io_info->span_arm & RAID_CTX_SPANARM_ARM_MASK);
1367 ld = MR_TargetIdToLdGet(io_info->ldTgtId, drv_map);
1368 raid = MR_LdRaidGet(ld, drv_map);
1369 span_row_size = instance->UnevenSpanSupport ?
1370 SPAN_ROW_SIZE(drv_map, ld, span) : raid->rowSize;
1372 arRef = MR_LdSpanArrayGet(ld, span, drv_map);
1373 pd0 = MR_ArPdGet(arRef, arm, drv_map);
1374 pd1 = MR_ArPdGet(arRef, (arm + 1) >= span_row_size ?
1375 (arm + 1 - span_row_size) : arm + 1, drv_map);
1377 /* Get PD1 Dev Handle */
1379 pd1_dev_handle = MR_PdDevHandleGet(pd1, drv_map);
1381 if (pd1_dev_handle == MR_DEVHANDLE_INVALID) {
1384 /* get the pending cmds for the data and mirror arms */
1385 pend0 = atomic_read(&lbInfo->scsi_pending_cmds[pd0]);
1386 pend1 = atomic_read(&lbInfo->scsi_pending_cmds[pd1]);
1388 /* Determine the disk whose head is nearer to the req. block */
1389 diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[pd0]);
1390 diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[pd1]);
1391 bestArm = (diff0 <= diff1 ? arm : arm ^ 1);
1393 /* Make balance count from 16 to 4 to
1394 * keep driver in sync with Firmware
1396 if ((bestArm == arm && pend0 > pend1 + lb_pending_cmds) ||
1397 (bestArm != arm && pend1 > pend0 + lb_pending_cmds))
1400 /* Update the last accessed block on the correct pd */
1402 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | bestArm;
1403 io_info->pd_after_lb = (bestArm == arm) ? pd0 : pd1;
1406 lbInfo->last_accessed_block[io_info->pd_after_lb] = block + count - 1;
1407 return io_info->pd_after_lb;
1410 __le16 get_updated_dev_handle(struct megasas_instance *instance,
1411 struct LD_LOAD_BALANCE_INFO *lbInfo,
1412 struct IO_REQUEST_INFO *io_info,
1413 struct MR_DRV_RAID_MAP_ALL *drv_map)
1418 /* get best new arm (PD ID) */
1419 arm_pd = megasas_get_best_arm_pd(instance, lbInfo, io_info, drv_map);
1420 devHandle = MR_PdDevHandleGet(arm_pd, drv_map);
1421 io_info->pd_interface = MR_PdInterfaceTypeGet(arm_pd, drv_map);
1422 atomic_inc(&lbInfo->scsi_pending_cmds[arm_pd]);