scsi/megaraid/megaraid_sas_fp.c

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]);
641 		"returns invalid arm for ld=%x strip=%lx\n",
647 /* This Function will return Phys arm */
653 	u32    arm = 0;
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);
664 		if (arm != -1U)
665 			arm *= 2;
669 	return arm;
676 * This routine calculates the arm, span and block for the specified stripe and
703 	u32	logArm, rowMod, armQ, arm;
718 		arm = armQ + 1 + logArm;
719 		if (arm >= SPAN_ROW_SIZE(map, ld, span))
720 			arm -= SPAN_ROW_SIZE(map, ld, span);
721 		physArm = (u8)arm;
723 		/* Calculate the arm */
777 * This routine calculates the arm, span and block for the specified stripe and
810 		/* logical arm within row */
812 		u32 rowMod, armQ, arm;
819 		arm = armQ+1+logArm; /* data always logically follows Q */
820 		if (arm >= raid->rowSize) /* handle wrap condition */
821 			arm -= raid->rowSize;
822 		physArm = (u8)arm;
899  * This routine calculates the logical arm, data Arm, row number and parity arm
918 	/* parity disk arm, first arm is 0 */
921 	/* logical arm within row */
923 	/* physical arm for data */
935 		/* P Parity arm, note this can go negative adjust if negative */
1357 	u8      bestArm, pd0, pd1, span, arm;
1365 	arm = (io_info->span_arm & RAID_CTX_SPANARM_ARM_MASK);
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);
1382 		bestArm = arm;
1391 		bestArm = (diff0 <= diff1 ? arm : arm ^ 1);
1396 		if ((bestArm == arm && pend0 > pend1 + lb_pending_cmds)  ||
1397 		    (bestArm != arm && pend1 > pend0 + lb_pending_cmds))
1403 		io_info->pd_after_lb = (bestArm == arm) ? pd0 : pd1;
1418 	/* get best new arm (PD ID) */