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/*********************license start************* * Author: Cavium Networks * * Contact: support@caviumnetworks.com * This file is part of the OCTEON SDK * * Copyright (c) 2003-2008 Cavium Networks * * This file is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License, Version 2, as * published by the Free Software Foundation. * * This file is distributed in the hope that it will be useful, but * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or * NONINFRINGEMENT. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License * along with this file; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * or visit http://www.gnu.org/licenses/. * * This file may also be available under a different license from Cavium. * Contact Cavium Networks for more information *********************license end**********************************/ / * Interface to the hardware Packet Order / Work unit. * * New, starting with SDK 1.7.0, cvmx-pow supports a number of * extended consistency checks. The define * CVMX_ENABLE_POW_CHECKS controls the runtime insertion of POW * internal state checks to find common programming errors. If * CVMX_ENABLE_POW_CHECKS is not defined, checks are by default * enabled. For example, cvmx-pow will check for the following * program errors or POW state inconsistency. * - Requesting a POW operation with an active tag switch in * progress. * - Waiting for a tag switch to complete for an excessively * long period. This is normally a sign of an error in locking * causing deadlock. * - Illegal tag switches from NULL_NULL. * - Illegal tag switches from NULL. * - Illegal deschedule request. * - WQE pointer not matching the one attached to the core by * the POW. * / #ifndef __CVMX_POW_H__ #define __CVMX_POW_H__ #include <asm/octeon/cvmx-pow-defs.h> #include <asm/octeon/cvmx-scratch.h> #include <asm/octeon/cvmx-wqe.h> / Default to having all POW constancy checks turned on / #ifndef CVMX_ENABLE_POW_CHECKS #define CVMX_ENABLE_POW_CHECKS 1 #endif enum cvmx_pow_tag_type { / Tag ordering is maintained / CVMX_POW_TAG_TYPE_ORDERED = 0L, / Tag ordering is maintained, and at most one PP has the tag / CVMX_POW_TAG_TYPE_ATOMIC = 1L, / * The work queue entry from the order - NEVER tag switch from * NULL to NULL / CVMX_POW_TAG_TYPE_NULL = 2L, / A tag switch to NULL, and there is no space reserved in POW * - NEVER tag switch to NULL_NULL * - NEVER tag switch from NULL_NULL * - NULL_NULL is entered at the beginning of time and on a deschedule. * - NULL_NULL can be exited by a new work request. A NULL_SWITCH * load can also switch the state to NULL / CVMX_POW_TAG_TYPE_NULL_NULL = 3L }; /* * Wait flag values for pow functions. / typedef enum { CVMX_POW_WAIT = 1, CVMX_POW_NO_WAIT = 0, } cvmx_pow_wait_t; /* * POW tag operations. These are used in the data stored to the POW. / typedef enum { / * switch the tag (only) for this PP * - the previous tag should be non-NULL in this case * - tag switch response required * - fields used: op, type, tag / CVMX_POW_TAG_OP_SWTAG = 0L, / * switch the tag for this PP, with full information * - this should be used when the previous tag is NULL * - tag switch response required * - fields used: address, op, grp, type, tag / CVMX_POW_TAG_OP_SWTAG_FULL = 1L, / * switch the tag (and/or group) for this PP and de-schedule * - OK to keep the tag the same and only change the group * - fields used: op, no_sched, grp, type, tag / CVMX_POW_TAG_OP_SWTAG_DESCH = 2L, / * just de-schedule * - fields used: op, no_sched / CVMX_POW_TAG_OP_DESCH = 3L, / * create an entirely new work queue entry * - fields used: address, op, qos, grp, type, tag / CVMX_POW_TAG_OP_ADDWQ = 4L, / * just update the work queue pointer and grp for this PP * - fields used: address, op, grp / CVMX_POW_TAG_OP_UPDATE_WQP_GRP = 5L, / * set the no_sched bit on the de-schedule list * * - does nothing if the selected entry is not on the * de-schedule list * * - does nothing if the stored work queue pointer does not * match the address field * * - fields used: address, index, op * * Before issuing a _NSCHED operation, SW must guarantee that all prior deschedules and set/clr NSCHED operations * are complete and all prior switches are complete. The * hardware provides the opsdone bit and swdone bit for SW * polling. After issuing a _NSCHED operation, SW must guarantee that the set/clr NSCHED is complete before any * subsequent operations. / CVMX_POW_TAG_OP_SET_NSCHED = 6L, / * clears the no_sched bit on the de-schedule list * * - does nothing if the selected entry is not on the * de-schedule list * * - does nothing if the stored work queue pointer does not * match the address field * * - fields used: address, index, op * * Before issuing a _NSCHED operation, SW must guarantee that all prior deschedules and set/clr NSCHED operations are * complete and all prior switches are complete. The hardware * provides the opsdone bit and swdone bit for SW * polling. After issuing a _NSCHED operation, SW must guarantee that the set/clr NSCHED is complete before any * subsequent operations. / CVMX_POW_TAG_OP_CLR_NSCHED = 7L, / do nothing / CVMX_POW_TAG_OP_NOP = 15L } cvmx_pow_tag_op_t; /* * This structure defines the store data on a store to POW / typedef union { uint64_t u64; struct { #ifdef __BIG_ENDIAN_BITFIELD / * Don't reschedule this entry. no_sched is used for * CVMX_POW_TAG_OP_SWTAG_DESCH and * CVMX_POW_TAG_OP_DESCH / uint64_t no_sched:1; uint64_t unused:2; / Tontains index of entry for a CVMX_POW_TAG_OP__NSCHED / uint64_t index:13; /* The operation to perform / cvmx_pow_tag_op_t op:4; uint64_t unused2:2; / * The QOS level for the packet. qos is only used for * CVMX_POW_TAG_OP_ADDWQ / uint64_t qos:3; / * The group that the work queue entry will be * scheduled to grp is used for CVMX_POW_TAG_OP_ADDWQ, * CVMX_POW_TAG_OP_SWTAG_FULL, * CVMX_POW_TAG_OP_SWTAG_DESCH, and * CVMX_POW_TAG_OP_UPDATE_WQP_GRP / uint64_t grp:4; / * The type of the tag. type is used for everything * except CVMX_POW_TAG_OP_DESCH, * CVMX_POW_TAG_OP_UPDATE_WQP_GRP, and * CVMX_POW_TAG_OP__NSCHED / uint64_t type:3; /* * The actual tag. tag is used for everything except * CVMX_POW_TAG_OP_DESCH, * CVMX_POW_TAG_OP_UPDATE_WQP_GRP, and * CVMX_POW_TAG_OP__NSCHED / uint64_t tag:32; #else uint64_t tag:32; uint64_t type:3; uint64_t grp:4; uint64_t qos:3; uint64_t unused2:2; cvmx_pow_tag_op_t op:4; uint64_t index:13; uint64_t unused:2; uint64_t no_sched:1; #endif } s; } cvmx_pow_tag_req_t; /** * This structure describes the address to load stuff from POW / typedef union { uint64_t u64; /* * Address for new work request loads (did<2:0> == 0) / struct { #ifdef __BIG_ENDIAN_BITFIELD / Mips64 address region. Should be CVMX_IO_SEG / uint64_t mem_region:2; / Must be zero / uint64_t reserved_49_61:13; / Must be one / uint64_t is_io:1; / the ID of POW -- did<2:0> == 0 in this case / uint64_t did:8; / Must be zero / uint64_t reserved_4_39:36; / * If set, don't return load response until work is * available. / uint64_t wait:1; / Must be zero / uint64_t reserved_0_2:3; #else uint64_t reserved_0_2:3; uint64_t wait:1; uint64_t reserved_4_39:36; uint64_t did:8; uint64_t is_io:1; uint64_t reserved_49_61:13; uint64_t mem_region:2; #endif } swork; /* * Address for loads to get POW internal status / struct { #ifdef __BIG_ENDIAN_BITFIELD / Mips64 address region. Should be CVMX_IO_SEG / uint64_t mem_region:2; / Must be zero / uint64_t reserved_49_61:13; / Must be one / uint64_t is_io:1; / the ID of POW -- did<2:0> == 1 in this case / uint64_t did:8; / Must be zero / uint64_t reserved_10_39:30; / The core id to get status for / uint64_t coreid:4; / * If set and get_cur is set, return reverse tag-list * pointer rather than forward tag-list pointer. / uint64_t get_rev:1; / * If set, return current status rather than pending * status. / uint64_t get_cur:1; / * If set, get the work-queue pointer rather than * tag/type. / uint64_t get_wqp:1; / Must be zero / uint64_t reserved_0_2:3; #else uint64_t reserved_0_2:3; uint64_t get_wqp:1; uint64_t get_cur:1; uint64_t get_rev:1; uint64_t coreid:4; uint64_t reserved_10_39:30; uint64_t did:8; uint64_t is_io:1; uint64_t reserved_49_61:13; uint64_t mem_region:2; #endif } sstatus; /* * Address for memory loads to get POW internal state / struct { #ifdef __BIG_ENDIAN_BITFIELD / Mips64 address region. Should be CVMX_IO_SEG / uint64_t mem_region:2; / Must be zero / uint64_t reserved_49_61:13; / Must be one / uint64_t is_io:1; / the ID of POW -- did<2:0> == 2 in this case / uint64_t did:8; / Must be zero / uint64_t reserved_16_39:24; / POW memory index / uint64_t index:11; / * If set, return deschedule information rather than * the standard response for work-queue index (invalid * if the work-queue entry is not on the deschedule * list). / uint64_t get_des:1; / * If set, get the work-queue pointer rather than * tag/type (no effect when get_des set). / uint64_t get_wqp:1; / Must be zero / uint64_t reserved_0_2:3; #else uint64_t reserved_0_2:3; uint64_t get_wqp:1; uint64_t get_des:1; uint64_t index:11; uint64_t reserved_16_39:24; uint64_t did:8; uint64_t is_io:1; uint64_t reserved_49_61:13; uint64_t mem_region:2; #endif } smemload; /* * Address for index/pointer loads / struct { #ifdef __BIG_ENDIAN_BITFIELD / Mips64 address region. Should be CVMX_IO_SEG / uint64_t mem_region:2; / Must be zero / uint64_t reserved_49_61:13; / Must be one / uint64_t is_io:1; / the ID of POW -- did<2:0> == 3 in this case / uint64_t did:8; / Must be zero / uint64_t reserved_9_39:31; / * when {get_rmt ==0 AND get_des_get_tail == 0}, this * field selects one of eight POW internal-input * queues (0-7), one per QOS level; values 8-15 are * illegal in this case; when {get_rmt ==0 AND * get_des_get_tail == 1}, this field selects one of * 16 deschedule lists (per group); when get_rmt ==1, * this field selects one of 16 memory-input queue * lists. The two memory-input queue lists associated * with each QOS level are: * * - qosgrp = 0, qosgrp = 8: QOS0 * - qosgrp = 1, qosgrp = 9: QOS1 * - qosgrp = 2, qosgrp = 10: QOS2 * - qosgrp = 3, qosgrp = 11: QOS3 * - qosgrp = 4, qosgrp = 12: QOS4 * - qosgrp = 5, qosgrp = 13: QOS5 * - qosgrp = 6, qosgrp = 14: QOS6 * - qosgrp = 7, qosgrp = 15: QOS7 / uint64_t qosgrp:4; / * If set and get_rmt is clear, return deschedule list * indexes rather than indexes for the specified qos * level; if set and get_rmt is set, return the tail * pointer rather than the head pointer for the * specified qos level. / uint64_t get_des_get_tail:1; / * If set, return remote pointers rather than the * local indexes for the specified qos level. / uint64_t get_rmt:1; / Must be zero / uint64_t reserved_0_2:3; #else uint64_t reserved_0_2:3; uint64_t get_rmt:1; uint64_t get_des_get_tail:1; uint64_t qosgrp:4; uint64_t reserved_9_39:31; uint64_t did:8; uint64_t is_io:1; uint64_t reserved_49_61:13; uint64_t mem_region:2; #endif } sindexload; /* * address for NULL_RD request (did<2:0> == 4) when this is read, * HW attempts to change the state to NULL if it is NULL_NULL (the * hardware cannot switch from NULL_NULL to NULL if a POW entry is * not available - software may need to recover by finishing * another piece of work before a POW entry can ever become * available.) / struct { #ifdef __BIG_ENDIAN_BITFIELD / Mips64 address region. Should be CVMX_IO_SEG / uint64_t mem_region:2; / Must be zero / uint64_t reserved_49_61:13; / Must be one / uint64_t is_io:1; / the ID of POW -- did<2:0> == 4 in this case / uint64_t did:8; / Must be zero / uint64_t reserved_0_39:40; #else uint64_t reserved_0_39:40; uint64_t did:8; uint64_t is_io:1; uint64_t reserved_49_61:13; uint64_t mem_region:2; #endif } snull_rd; } cvmx_pow_load_addr_t; /* * This structure defines the response to a load/SENDSINGLE to POW * (except CSR reads) / typedef union { uint64_t u64; /* * Response to new work request loads / struct { #ifdef __BIG_ENDIAN_BITFIELD / * Set when no new work queue entry was returned. * * If there was de-scheduled work, the HW will * definitely return it. When this bit is set, it * could mean either mean: * * - There was no work, or * * - There was no work that the HW could find. This * case can happen, regardless of the wait bit value * in the original request, when there is work in * the IQ's that is too deep down the list. / uint64_t no_work:1; / Must be zero / uint64_t reserved_40_62:23; / 36 in O1 -- the work queue pointer / uint64_t addr:40; #else uint64_t addr:40; uint64_t reserved_40_62:23; uint64_t no_work:1; #endif } s_work; /* * Result for a POW Status Load (when get_cur==0 and get_wqp==0) / struct { #ifdef __BIG_ENDIAN_BITFIELD uint64_t reserved_62_63:2; / Set when there is a pending non-NULL SWTAG or * SWTAG_FULL, and the POW entry has not left the list * for the original tag. / uint64_t pend_switch:1; / Set when SWTAG_FULL and pend_switch is set. / uint64_t pend_switch_full:1; / * Set when there is a pending NULL SWTAG, or an * implicit switch to NULL. / uint64_t pend_switch_null:1; / Set when there is a pending DESCHED or SWTAG_DESCHED. / uint64_t pend_desched:1; / * Set when there is a pending SWTAG_DESCHED and * pend_desched is set. / uint64_t pend_desched_switch:1; / Set when nosched is desired and pend_desched is set. / uint64_t pend_nosched:1; / Set when there is a pending GET_WORK. / uint64_t pend_new_work:1; / * When pend_new_work is set, this bit indicates that * the wait bit was set. / uint64_t pend_new_work_wait:1; / Set when there is a pending NULL_RD. / uint64_t pend_null_rd:1; / Set when there is a pending CLR_NSCHED. / uint64_t pend_nosched_clr:1; uint64_t reserved_51:1; / This is the index when pend_nosched_clr is set. / uint64_t pend_index:11; / * This is the new_grp when (pend_desched AND * pend_desched_switch) is set. / uint64_t pend_grp:4; uint64_t reserved_34_35:2; / * This is the tag type when pend_switch or * (pend_desched AND pend_desched_switch) are set. / uint64_t pend_type:2; / * - this is the tag when pend_switch or (pend_desched * AND pend_desched_switch) are set. / uint64_t pend_tag:32; #else uint64_t pend_tag:32; uint64_t pend_type:2; uint64_t reserved_34_35:2; uint64_t pend_grp:4; uint64_t pend_index:11; uint64_t reserved_51:1; uint64_t pend_nosched_clr:1; uint64_t pend_null_rd:1; uint64_t pend_new_work_wait:1; uint64_t pend_new_work:1; uint64_t pend_nosched:1; uint64_t pend_desched_switch:1; uint64_t pend_desched:1; uint64_t pend_switch_null:1; uint64_t pend_switch_full:1; uint64_t pend_switch:1; uint64_t reserved_62_63:2; #endif } s_sstatus0; /* * Result for a POW Status Load (when get_cur==0 and get_wqp==1) / struct { #ifdef __BIG_ENDIAN_BITFIELD uint64_t reserved_62_63:2; / * Set when there is a pending non-NULL SWTAG or * SWTAG_FULL, and the POW entry has not left the list * for the original tag. / uint64_t pend_switch:1; / Set when SWTAG_FULL and pend_switch is set. / uint64_t pend_switch_full:1; / * Set when there is a pending NULL SWTAG, or an * implicit switch to NULL. / uint64_t pend_switch_null:1; / * Set when there is a pending DESCHED or * SWTAG_DESCHED. / uint64_t pend_desched:1; / * Set when there is a pending SWTAG_DESCHED and * pend_desched is set. / uint64_t pend_desched_switch:1; / Set when nosched is desired and pend_desched is set. / uint64_t pend_nosched:1; / Set when there is a pending GET_WORK. / uint64_t pend_new_work:1; / * When pend_new_work is set, this bit indicates that * the wait bit was set. / uint64_t pend_new_work_wait:1; / Set when there is a pending NULL_RD. / uint64_t pend_null_rd:1; / Set when there is a pending CLR_NSCHED. / uint64_t pend_nosched_clr:1; uint64_t reserved_51:1; / This is the index when pend_nosched_clr is set. / uint64_t pend_index:11; / * This is the new_grp when (pend_desched AND * pend_desched_switch) is set. / uint64_t pend_grp:4; / This is the wqp when pend_nosched_clr is set. / uint64_t pend_wqp:36; #else uint64_t pend_wqp:36; uint64_t pend_grp:4; uint64_t pend_index:11; uint64_t reserved_51:1; uint64_t pend_nosched_clr:1; uint64_t pend_null_rd:1; uint64_t pend_new_work_wait:1; uint64_t pend_new_work:1; uint64_t pend_nosched:1; uint64_t pend_desched_switch:1; uint64_t pend_desched:1; uint64_t pend_switch_null:1; uint64_t pend_switch_full:1; uint64_t pend_switch:1; uint64_t reserved_62_63:2; #endif } s_sstatus1; /* * Result for a POW Status Load (when get_cur==1, get_wqp==0, and * get_rev==0) / struct { #ifdef __BIG_ENDIAN_BITFIELD uint64_t reserved_62_63:2; / * Points to the next POW entry in the tag list when * tail == 0 (and tag_type is not NULL or NULL_NULL). / uint64_t link_index:11; / The POW entry attached to the core. / uint64_t index:11; / * The group attached to the core (updated when new * tag list entered on SWTAG_FULL). / uint64_t grp:4; / * Set when this POW entry is at the head of its tag * list (also set when in the NULL or NULL_NULL * state). / uint64_t head:1; / * Set when this POW entry is at the tail of its tag * list (also set when in the NULL or NULL_NULL * state). / uint64_t tail:1; / * The tag type attached to the core (updated when new * tag list entered on SWTAG, SWTAG_FULL, or * SWTAG_DESCHED). / uint64_t tag_type:2; / * The tag attached to the core (updated when new tag * list entered on SWTAG, SWTAG_FULL, or * SWTAG_DESCHED). / uint64_t tag:32; #else uint64_t tag:32; uint64_t tag_type:2; uint64_t tail:1; uint64_t head:1; uint64_t grp:4; uint64_t index:11; uint64_t link_index:11; uint64_t reserved_62_63:2; #endif } s_sstatus2; /* * Result for a POW Status Load (when get_cur==1, get_wqp==0, and get_rev==1) / struct { #ifdef __BIG_ENDIAN_BITFIELD uint64_t reserved_62_63:2; / * Points to the prior POW entry in the tag list when * head == 0 (and tag_type is not NULL or * NULL_NULL). This field is unpredictable when the * core's state is NULL or NULL_NULL. / uint64_t revlink_index:11; / The POW entry attached to the core. / uint64_t index:11; / * The group attached to the core (updated when new * tag list entered on SWTAG_FULL). / uint64_t grp:4; / Set when this POW entry is at the head of its tag * list (also set when in the NULL or NULL_NULL * state). / uint64_t head:1; / * Set when this POW entry is at the tail of its tag * list (also set when in the NULL or NULL_NULL * state). / uint64_t tail:1; / * The tag type attached to the core (updated when new * tag list entered on SWTAG, SWTAG_FULL, or * SWTAG_DESCHED). / uint64_t tag_type:2; / * The tag attached to the core (updated when new tag * list entered on SWTAG, SWTAG_FULL, or * SWTAG_DESCHED). / uint64_t tag:32; #else uint64_t tag:32; uint64_t tag_type:2; uint64_t tail:1; uint64_t head:1; uint64_t grp:4; uint64_t index:11; uint64_t revlink_index:11; uint64_t reserved_62_63:2; #endif } s_sstatus3; /* * Result for a POW Status Load (when get_cur==1, get_wqp==1, and * get_rev==0) / struct { #ifdef __BIG_ENDIAN_BITFIELD uint64_t reserved_62_63:2; / * Points to the next POW entry in the tag list when * tail == 0 (and tag_type is not NULL or NULL_NULL). / uint64_t link_index:11; / The POW entry attached to the core. / uint64_t index:11; / * The group attached to the core (updated when new * tag list entered on SWTAG_FULL). / uint64_t grp:4; / * The wqp attached to the core (updated when new tag * list entered on SWTAG_FULL). / uint64_t wqp:36; #else uint64_t wqp:36; uint64_t grp:4; uint64_t index:11; uint64_t link_index:11; uint64_t reserved_62_63:2; #endif } s_sstatus4; /* * Result for a POW Status Load (when get_cur==1, get_wqp==1, and * get_rev==1) / struct { #ifdef __BIG_ENDIAN_BITFIELD uint64_t reserved_62_63:2; / * Points to the prior POW entry in the tag list when * head == 0 (and tag_type is not NULL or * NULL_NULL). This field is unpredictable when the * core's state is NULL or NULL_NULL. / uint64_t revlink_index:11; / The POW entry attached to the core. / uint64_t index:11; / * The group attached to the core (updated when new * tag list entered on SWTAG_FULL). / uint64_t grp:4; / * The wqp attached to the core (updated when new tag * list entered on SWTAG_FULL). / uint64_t wqp:36; #else uint64_t wqp:36; uint64_t grp:4; uint64_t index:11; uint64_t revlink_index:11; uint64_t reserved_62_63:2; #endif } s_sstatus5; /* * Result For POW Memory Load (get_des == 0 and get_wqp == 0) / struct { #ifdef __BIG_ENDIAN_BITFIELD uint64_t reserved_51_63:13; / * The next entry in the input, free, descheduled_head * list (unpredictable if entry is the tail of the * list). / uint64_t next_index:11; / The group of the POW entry. / uint64_t grp:4; uint64_t reserved_35:1; / * Set when this POW entry is at the tail of its tag * list (also set when in the NULL or NULL_NULL * state). / uint64_t tail:1; / The tag type of the POW entry. / uint64_t tag_type:2; / The tag of the POW entry. / uint64_t tag:32; #else uint64_t tag:32; uint64_t tag_type:2; uint64_t tail:1; uint64_t reserved_35:1; uint64_t grp:4; uint64_t next_index:11; uint64_t reserved_51_63:13; #endif } s_smemload0; /* * Result For POW Memory Load (get_des == 0 and get_wqp == 1) / struct { #ifdef __BIG_ENDIAN_BITFIELD uint64_t reserved_51_63:13; / * The next entry in the input, free, descheduled_head * list (unpredictable if entry is the tail of the * list). / uint64_t next_index:11; / The group of the POW entry. / uint64_t grp:4; / The WQP held in the POW entry. / uint64_t wqp:36; #else uint64_t wqp:36; uint64_t grp:4; uint64_t next_index:11; uint64_t reserved_51_63:13; #endif } s_smemload1; /* * Result For POW Memory Load (get_des == 1) / struct { #ifdef __BIG_ENDIAN_BITFIELD uint64_t reserved_51_63:13; / * The next entry in the tag list connected to the * descheduled head. / uint64_t fwd_index:11; / The group of the POW entry. / uint64_t grp:4; / The nosched bit for the POW entry. / uint64_t nosched:1; / There is a pending tag switch / uint64_t pend_switch:1; / * The next tag type for the new tag list when * pend_switch is set. / uint64_t pend_type:2; / * The next tag for the new tag list when pend_switch * is set. / uint64_t pend_tag:32; #else uint64_t pend_tag:32; uint64_t pend_type:2; uint64_t pend_switch:1; uint64_t nosched:1; uint64_t grp:4; uint64_t fwd_index:11; uint64_t reserved_51_63:13; #endif } s_smemload2; /* * Result For POW Index/Pointer Load (get_rmt == 0/get_des_get_tail == 0) / struct { #ifdef __BIG_ENDIAN_BITFIELD uint64_t reserved_52_63:12; / * set when there is one or more POW entries on the * free list. / uint64_t free_val:1; / * set when there is exactly one POW entry on the free * list. / uint64_t free_one:1; uint64_t reserved_49:1; / * when free_val is set, indicates the first entry on * the free list. / uint64_t free_head:11; uint64_t reserved_37:1; / * when free_val is set, indicates the last entry on * the free list. / uint64_t free_tail:11; / * set when there is one or more POW entries on the * input Q list selected by qosgrp. / uint64_t loc_val:1; / * set when there is exactly one POW entry on the * input Q list selected by qosgrp. / uint64_t loc_one:1; uint64_t reserved_23:1; / * when loc_val is set, indicates the first entry on * the input Q list selected by qosgrp. / uint64_t loc_head:11; uint64_t reserved_11:1; / * when loc_val is set, indicates the last entry on * the input Q list selected by qosgrp. / uint64_t loc_tail:11; #else uint64_t loc_tail:11; uint64_t reserved_11:1; uint64_t loc_head:11; uint64_t reserved_23:1; uint64_t loc_one:1; uint64_t loc_val:1; uint64_t free_tail:11; uint64_t reserved_37:1; uint64_t free_head:11; uint64_t reserved_49:1; uint64_t free_one:1; uint64_t free_val:1; uint64_t reserved_52_63:12; #endif } sindexload0; /* * Result For POW Index/Pointer Load (get_rmt == 0/get_des_get_tail == 1) / struct { #ifdef __BIG_ENDIAN_BITFIELD uint64_t reserved_52_63:12; / * set when there is one or more POW entries on the * nosched list. / uint64_t nosched_val:1; / * set when there is exactly one POW entry on the * nosched list. / uint64_t nosched_one:1; uint64_t reserved_49:1; / * when nosched_val is set, indicates the first entry * on the nosched list. / uint64_t nosched_head:11; uint64_t reserved_37:1; / * when nosched_val is set, indicates the last entry * on the nosched list. / uint64_t nosched_tail:11; / * set when there is one or more descheduled heads on * the descheduled list selected by qosgrp. / uint64_t des_val:1; / * set when there is exactly one descheduled head on * the descheduled list selected by qosgrp. / uint64_t des_one:1; uint64_t reserved_23:1; / * when des_val is set, indicates the first * descheduled head on the descheduled list selected * by qosgrp. / uint64_t des_head:11; uint64_t reserved_11:1; / * when des_val is set, indicates the last descheduled * head on the descheduled list selected by qosgrp. / uint64_t des_tail:11; #else uint64_t des_tail:11; uint64_t reserved_11:1; uint64_t des_head:11; uint64_t reserved_23:1; uint64_t des_one:1; uint64_t des_val:1; uint64_t nosched_tail:11; uint64_t reserved_37:1; uint64_t nosched_head:11; uint64_t reserved_49:1; uint64_t nosched_one:1; uint64_t nosched_val:1; uint64_t reserved_52_63:12; #endif } sindexload1; /* * Result For POW Index/Pointer Load (get_rmt == 1/get_des_get_tail == 0) / struct { #ifdef __BIG_ENDIAN_BITFIELD uint64_t reserved_39_63:25; / * Set when this DRAM list is the current head * (i.e. is the next to be reloaded when the POW * hardware reloads a POW entry from DRAM). The POW * hardware alternates between the two DRAM lists * associated with a QOS level when it reloads work * from DRAM into the POW unit. / uint64_t rmt_is_head:1; / * Set when the DRAM portion of the input Q list * selected by qosgrp contains one or more pieces of * work. / uint64_t rmt_val:1; / * Set when the DRAM portion of the input Q list * selected by qosgrp contains exactly one piece of * work. / uint64_t rmt_one:1; / * When rmt_val is set, indicates the first piece of * work on the DRAM input Q list selected by * qosgrp. / uint64_t rmt_head:36; #else uint64_t rmt_head:36; uint64_t rmt_one:1; uint64_t rmt_val:1; uint64_t rmt_is_head:1; uint64_t reserved_39_63:25; #endif } sindexload2; /* * Result For POW Index/Pointer Load (get_rmt == * 1/get_des_get_tail == 1) / struct { #ifdef __BIG_ENDIAN_BITFIELD uint64_t reserved_39_63:25; / * set when this DRAM list is the current head * (i.e. is the next to be reloaded when the POW * hardware reloads a POW entry from DRAM). The POW * hardware alternates between the two DRAM lists * associated with a QOS level when it reloads work * from DRAM into the POW unit. / uint64_t rmt_is_head:1; / * set when the DRAM portion of the input Q list * selected by qosgrp contains one or more pieces of * work. / uint64_t rmt_val:1; / * set when the DRAM portion of the input Q list * selected by qosgrp contains exactly one piece of * work. / uint64_t rmt_one:1; / * when rmt_val is set, indicates the last piece of * work on the DRAM input Q list selected by * qosgrp. / uint64_t rmt_tail:36; #else uint64_t rmt_tail:36; uint64_t rmt_one:1; uint64_t rmt_val:1; uint64_t rmt_is_head:1; uint64_t reserved_39_63:25; #endif } sindexload3; /* * Response to NULL_RD request loads / struct { #ifdef __BIG_ENDIAN_BITFIELD uint64_t unused:62; / of type cvmx_pow_tag_type_t. state is one of the * following: * * - CVMX_POW_TAG_TYPE_ORDERED * - CVMX_POW_TAG_TYPE_ATOMIC * - CVMX_POW_TAG_TYPE_NULL * - CVMX_POW_TAG_TYPE_NULL_NULL / uint64_t state:2; #else uint64_t state:2; uint64_t unused:62; #endif } s_null_rd; } cvmx_pow_tag_load_resp_t; /* * This structure describes the address used for stores to the POW. * The store address is meaningful on stores to the POW. The * hardware assumes that an aligned 64-bit store was used for all * these stores. Note the assumption that the work queue entry is * aligned on an 8-byte boundary (since the low-order 3 address bits * must be zero). Note that not all fields are used by all * operations. * * NOTE: The following is the behavior of the pending switch bit at the PP * for POW stores (i.e. when did<7:3> == 0xc) * - did<2:0> == 0 => pending switch bit is set * - did<2:0> == 1 => no affect on the pending switch bit * - did<2:0> == 3 => pending switch bit is cleared * - did<2:0> == 7 => no affect on the pending switch bit * - did<2:0> == others => must not be used * - No other loads/stores have an affect on the pending switch bit * - The switch bus from POW can clear the pending switch bit * * NOTE: did<2:0> == 2 is used by the HW for a special single-cycle * ADDWQ command that only contains the pointer). SW must never use * did<2:0> == 2. / typedef union { /* * Unsigned 64 bit integer representation of store address / uint64_t u64; struct { #ifdef __BIG_ENDIAN_BITFIELD / Memory region. Should be CVMX_IO_SEG in most cases / uint64_t mem_reg:2; uint64_t reserved_49_61:13; / Must be zero / uint64_t is_io:1; / Must be one / / Device ID of POW. Note that different sub-dids are used. / uint64_t did:8; uint64_t reserved_36_39:4; / Must be zero / / Address field. addr<2:0> must be zero / uint64_t addr:36; #else uint64_t addr:36; uint64_t reserved_36_39:4; uint64_t did:8; uint64_t is_io:1; uint64_t reserved_49_61:13; uint64_t mem_reg:2; #endif } stag; } cvmx_pow_tag_store_addr_t; /* * decode of the store data when an IOBDMA SENDSINGLE is sent to POW / typedef union { uint64_t u64; struct { #ifdef __BIG_ENDIAN_BITFIELD / * the (64-bit word) location in scratchpad to write * to (if len != 0) / uint64_t scraddr:8; / the number of words in the response (0 => no response) / uint64_t len:8; / the ID of the device on the non-coherent bus / uint64_t did:8; uint64_t unused:36; / if set, don't return load response until work is available / uint64_t wait:1; uint64_t unused2:3; #else uint64_t unused2:3; uint64_t wait:1; uint64_t unused:36; uint64_t did:8; uint64_t len:8; uint64_t scraddr:8; #endif } s; } cvmx_pow_iobdma_store_t; / CSR typedefs have been moved to cvmx-csr-.h / /** * Get the POW tag for this core. This returns the current * tag type, tag, group, and POW entry index associated with * this core. Index is only valid if the tag type isn't NULL_NULL. * If a tag switch is pending this routine returns the tag before * the tag switch, not after. * * Returns Current tag / static inline cvmx_pow_tag_req_t cvmx_pow_get_current_tag(void) { cvmx_pow_load_addr_t load_addr; cvmx_pow_tag_load_resp_t load_resp; cvmx_pow_tag_req_t result; load_addr.u64 = 0; load_addr.sstatus.mem_region = CVMX_IO_SEG; load_addr.sstatus.is_io = 1; load_addr.sstatus.did = CVMX_OCT_DID_TAG_TAG1; load_addr.sstatus.coreid = cvmx_get_core_num(); load_addr.sstatus.get_cur = 1; load_resp.u64 = cvmx_read_csr(load_addr.u64); result.u64 = 0; result.s.grp = load_resp.s_sstatus2.grp; result.s.index = load_resp.s_sstatus2.index; result.s.type = load_resp.s_sstatus2.tag_type; result.s.tag = load_resp.s_sstatus2.tag; return result; } /* * Get the POW WQE for this core. This returns the work queue * entry currently associated with this core. * * Returns WQE pointer / static inline cvmx_wqe_t cvmx_pow_get_current_wqp(void) { cvmx_pow_load_addr_t load_addr; cvmx_pow_tag_load_resp_t load_resp; load_addr.u64 = 0; load_addr.sstatus.mem_region = CVMX_IO_SEG; load_addr.sstatus.is_io = 1; load_addr.sstatus.did = CVMX_OCT_DID_TAG_TAG1; load_addr.sstatus.coreid = cvmx_get_core_num(); load_addr.sstatus.get_cur = 1; load_addr.sstatus.get_wqp = 1; load_resp.u64 = cvmx_read_csr(load_addr.u64); return (cvmx_wqe_t ) cvmx_phys_to_ptr(load_resp.s_sstatus4.wqp); } #ifndef CVMX_MF_CHORD #define CVMX_MF_CHORD(dest) CVMX_RDHWR(dest, 30) #endif /* * Print a warning if a tag switch is pending for this core * * @function: Function name checking for a pending tag switch / static inline void __cvmx_pow_warn_if_pending_switch(const char function) { uint64_t switch_complete; CVMX_MF_CHORD(switch_complete); if (!switch_complete) pr_warn("%s called with tag switch in progress\n", function); } /** * Waits for a tag switch to complete by polling the completion bit. * Note that switches to NULL complete immediately and do not need * to be waited for. / static inline void cvmx_pow_tag_sw_wait(void) { const uint64_t MAX_CYCLES = 1ull << 31; uint64_t switch_complete; uint64_t start_cycle = cvmx_get_cycle(); while (1) { CVMX_MF_CHORD(switch_complete); if (unlikely(switch_complete)) break; if (unlikely(cvmx_get_cycle() > start_cycle + MAX_CYCLES)) { pr_warn("Tag switch is taking a long time, possible deadlock\n"); start_cycle = -MAX_CYCLES - 1; } } } /* * Synchronous work request. Requests work from the POW. * This function does NOT wait for previous tag switches to complete, * so the caller must ensure that there is not a pending tag switch. * * @wait: When set, call stalls until work becomes avaiable, or times out. * If not set, returns immediately. * * Returns Returns the WQE pointer from POW. Returns NULL if no work * was available. / static inline cvmx_wqe_t cvmx_pow_work_request_sync_nocheck(cvmx_pow_wait_t wait) { cvmx_pow_load_addr_t ptr; cvmx_pow_tag_load_resp_t result; if (CVMX_ENABLE_POW_CHECKS) __cvmx_pow_warn_if_pending_switch(__func__); ptr.u64 = 0; ptr.swork.mem_region = CVMX_IO_SEG; ptr.swork.is_io = 1; ptr.swork.did = CVMX_OCT_DID_TAG_SWTAG; ptr.swork.wait = wait; result.u64 = cvmx_read_csr(ptr.u64); if (result.s_work.no_work) return NULL; else return (cvmx_wqe_t ) cvmx_phys_to_ptr(result.s_work.addr); } /* * Synchronous work request. Requests work from the POW. * This function waits for any previous tag switch to complete before * requesting the new work. * * @wait: When set, call stalls until work becomes avaiable, or times out. * If not set, returns immediately. * * Returns Returns the WQE pointer from POW. Returns NULL if no work * was available. / static inline cvmx_wqe_t cvmx_pow_work_request_sync(cvmx_pow_wait_t wait) { if (CVMX_ENABLE_POW_CHECKS) __cvmx_pow_warn_if_pending_switch(__func__); /* Must not have a switch pending when requesting work / cvmx_pow_tag_sw_wait(); return cvmx_pow_work_request_sync_nocheck(wait); } /* * Synchronous null_rd request. Requests a switch out of NULL_NULL POW state. * This function waits for any previous tag switch to complete before * requesting the null_rd. * * Returns Returns the POW state of type cvmx_pow_tag_type_t. / static inline enum cvmx_pow_tag_type cvmx_pow_work_request_null_rd(void) { cvmx_pow_load_addr_t ptr; cvmx_pow_tag_load_resp_t result; if (CVMX_ENABLE_POW_CHECKS) __cvmx_pow_warn_if_pending_switch(__func__); / Must not have a switch pending when requesting work / cvmx_pow_tag_sw_wait(); ptr.u64 = 0; ptr.snull_rd.mem_region = CVMX_IO_SEG; ptr.snull_rd.is_io = 1; ptr.snull_rd.did = CVMX_OCT_DID_TAG_NULL_RD; result.u64 = cvmx_read_csr(ptr.u64); return (enum cvmx_pow_tag_type) result.s_null_rd.state; } /* * Asynchronous work request. Work is requested from the POW unit, * and should later be checked with function * cvmx_pow_work_response_async. This function does NOT wait for * previous tag switches to complete, so the caller must ensure that * there is not a pending tag switch. * * @scr_addr: Scratch memory address that response will be returned * to, which is either a valid WQE, or a response with the * invalid bit set. Byte address, must be 8 byte aligned. * * @wait: 1 to cause response to wait for work to become available (or * timeout), 0 to cause response to return immediately / static inline void cvmx_pow_work_request_async_nocheck(int scr_addr, cvmx_pow_wait_t wait) { cvmx_pow_iobdma_store_t data; if (CVMX_ENABLE_POW_CHECKS) __cvmx_pow_warn_if_pending_switch(__func__); / scr_addr must be 8 byte aligned / data.s.scraddr = scr_addr >> 3; data.s.len = 1; data.s.did = CVMX_OCT_DID_TAG_SWTAG; data.s.wait = wait; cvmx_send_single(data.u64); } /* * Asynchronous work request. Work is requested from the POW unit, * and should later be checked with function * cvmx_pow_work_response_async. This function waits for any previous * tag switch to complete before requesting the new work. * * @scr_addr: Scratch memory address that response will be returned * to, which is either a valid WQE, or a response with the * invalid bit set. Byte address, must be 8 byte aligned. * * @wait: 1 to cause response to wait for work to become available (or * timeout), 0 to cause response to return immediately / static inline void cvmx_pow_work_request_async(int scr_addr, cvmx_pow_wait_t wait) { if (CVMX_ENABLE_POW_CHECKS) __cvmx_pow_warn_if_pending_switch(__func__); / Must not have a switch pending when requesting work / cvmx_pow_tag_sw_wait(); cvmx_pow_work_request_async_nocheck(scr_addr, wait); } /* * Gets result of asynchronous work request. Performs a IOBDMA sync * to wait for the response. * * @scr_addr: Scratch memory address to get result from Byte address, * must be 8 byte aligned. * * Returns Returns the WQE from the scratch register, or NULL if no * work was available. / static inline cvmx_wqe_t cvmx_pow_work_response_async(int scr_addr) { cvmx_pow_tag_load_resp_t result; CVMX_SYNCIOBDMA; result.u64 = cvmx_scratch_read64(scr_addr); if (result.s_work.no_work) return NULL; else return (cvmx_wqe_t ) cvmx_phys_to_ptr(result.s_work.addr); } /* * Checks if a work queue entry pointer returned by a work * request is valid. It may be invalid due to no work * being available or due to a timeout. * * @wqe_ptr: pointer to a work queue entry returned by the POW * * Returns 0 if pointer is valid * 1 if invalid (no work was returned) / static inline uint64_t cvmx_pow_work_invalid(cvmx_wqe_t wqe_ptr) { return wqe_ptr == NULL; } /** * Starts a tag switch to the provided tag value and tag type. * Completion for the tag switch must be checked for separately. This * function does NOT update the work queue entry in dram to match tag * value and type, so the application must keep track of these if they * are important to the application. This tag switch command must not * be used for switches to NULL, as the tag switch pending bit will be * set by the switch request, but never cleared by the hardware. * * NOTE: This should not be used when switching from a NULL tag. Use * cvmx_pow_tag_sw_full() instead. * * This function does no checks, so the caller must ensure that any * previous tag switch has completed. * * @tag: new tag value * @tag_type: new tag type (ordered or atomic) / static inline void cvmx_pow_tag_sw_nocheck(uint32_t tag, enum cvmx_pow_tag_type tag_type) { cvmx_addr_t ptr; cvmx_pow_tag_req_t tag_req; if (CVMX_ENABLE_POW_CHECKS) { cvmx_pow_tag_req_t current_tag; __cvmx_pow_warn_if_pending_switch(__func__); current_tag = cvmx_pow_get_current_tag(); if (current_tag.s.type == CVMX_POW_TAG_TYPE_NULL_NULL) pr_warn("%s called with NULL_NULL tag\n", __func__); if (current_tag.s.type == CVMX_POW_TAG_TYPE_NULL) pr_warn("%s called with NULL tag\n", __func__); if ((current_tag.s.type == tag_type) && (current_tag.s.tag == tag)) pr_warn("%s called to perform a tag switch to the same tag\n", __func__); if (tag_type == CVMX_POW_TAG_TYPE_NULL) pr_warn("%s called to perform a tag switch to NULL. Use cvmx_pow_tag_sw_null() instead\n", __func__); } / * Note that WQE in DRAM is not updated here, as the POW does * not read from DRAM once the WQE is in flight. See hardware * manual for complete details. It is the application's * responsibility to keep track of the current tag value if * that is important. / tag_req.u64 = 0; tag_req.s.op = CVMX_POW_TAG_OP_SWTAG; tag_req.s.tag = tag; tag_req.s.type = tag_type; ptr.u64 = 0; ptr.sio.mem_region = CVMX_IO_SEG; ptr.sio.is_io = 1; ptr.sio.did = CVMX_OCT_DID_TAG_SWTAG; / once this store arrives at POW, it will attempt the switch software must wait for the switch to complete separately / cvmx_write_io(ptr.u64, tag_req.u64); } /* * Starts a tag switch to the provided tag value and tag type. * Completion for the tag switch must be checked for separately. This * function does NOT update the work queue entry in dram to match tag * value and type, so the application must keep track of these if they * are important to the application. This tag switch command must not * be used for switches to NULL, as the tag switch pending bit will be * set by the switch request, but never cleared by the hardware. * * NOTE: This should not be used when switching from a NULL tag. Use * cvmx_pow_tag_sw_full() instead. * * This function waits for any previous tag switch to complete, and also * displays an error on tag switches to NULL. * * @tag: new tag value * @tag_type: new tag type (ordered or atomic) / static inline void cvmx_pow_tag_sw(uint32_t tag, enum cvmx_pow_tag_type tag_type) { if (CVMX_ENABLE_POW_CHECKS) __cvmx_pow_warn_if_pending_switch(__func__); / * Note that WQE in DRAM is not updated here, as the POW does * not read from DRAM once the WQE is in flight. See hardware * manual for complete details. It is the application's * responsibility to keep track of the current tag value if * that is important. / / * Ensure that there is not a pending tag switch, as a tag * switch cannot be started if a previous switch is still * pending. / cvmx_pow_tag_sw_wait(); cvmx_pow_tag_sw_nocheck(tag, tag_type); } /* * Starts a tag switch to the provided tag value and tag type. * Completion for the tag switch must be checked for separately. This * function does NOT update the work queue entry in dram to match tag * value and type, so the application must keep track of these if they * are important to the application. This tag switch command must not * be used for switches to NULL, as the tag switch pending bit will be * set by the switch request, but never cleared by the hardware. * * This function must be used for tag switches from NULL. * * This function does no checks, so the caller must ensure that any * previous tag switch has completed. * * @wqp: pointer to work queue entry to submit. This entry is * updated to match the other parameters * @tag: tag value to be assigned to work queue entry * @tag_type: type of tag * @group: group value for the work queue entry. / static inline void cvmx_pow_tag_sw_full_nocheck(cvmx_wqe_t wqp, uint32_t tag, enum cvmx_pow_tag_type tag_type, uint64_t group) { cvmx_addr_t ptr; cvmx_pow_tag_req_t tag_req; if (CVMX_ENABLE_POW_CHECKS) { cvmx_pow_tag_req_t current_tag; __cvmx_pow_warn_if_pending_switch(__func__); current_tag = cvmx_pow_get_current_tag(); if (current_tag.s.type == CVMX_POW_TAG_TYPE_NULL_NULL) pr_warn("%s called with NULL_NULL tag\n", __func__); if ((current_tag.s.type == tag_type) && (current_tag.s.tag == tag)) pr_warn("%s called to perform a tag switch to the same tag\n", __func__); if (tag_type == CVMX_POW_TAG_TYPE_NULL) pr_warn("%s called to perform a tag switch to NULL. Use cvmx_pow_tag_sw_null() instead\n", __func__); if (wqp != cvmx_phys_to_ptr(0x80)) if (wqp != cvmx_pow_get_current_wqp()) pr_warn("%s passed WQE(%p) doesn't match the address in the POW(%p)\n", __func__, wqp, cvmx_pow_get_current_wqp()); } /* * Note that WQE in DRAM is not updated here, as the POW does * not read from DRAM once the WQE is in flight. See hardware * manual for complete details. It is the application's * responsibility to keep track of the current tag value if * that is important. / tag_req.u64 = 0; tag_req.s.op = CVMX_POW_TAG_OP_SWTAG_FULL; tag_req.s.tag = tag; tag_req.s.type = tag_type; tag_req.s.grp = group; ptr.u64 = 0; ptr.sio.mem_region = CVMX_IO_SEG; ptr.sio.is_io = 1; ptr.sio.did = CVMX_OCT_DID_TAG_SWTAG; ptr.sio.offset = CAST64(wqp); / * once this store arrives at POW, it will attempt the switch * software must wait for the switch to complete separately. / cvmx_write_io(ptr.u64, tag_req.u64); } /* * Starts a tag switch to the provided tag value and tag type. * Completion for the tag switch must be checked for separately. This * function does NOT update the work queue entry in dram to match tag * value and type, so the application must keep track of these if they * are important to the application. This tag switch command must not * be used for switches to NULL, as the tag switch pending bit will be * set by the switch request, but never cleared by the hardware. * * This function must be used for tag switches from NULL. * * This function waits for any pending tag switches to complete * before requesting the tag switch. * * @wqp: pointer to work queue entry to submit. This entry is updated * to match the other parameters * @tag: tag value to be assigned to work queue entry * @tag_type: type of tag * @group: group value for the work queue entry. / static inline void cvmx_pow_tag_sw_full(cvmx_wqe_t wqp, uint32_t tag, enum cvmx_pow_tag_type tag_type, uint64_t group) { if (CVMX_ENABLE_POW_CHECKS) __cvmx_pow_warn_if_pending_switch(__func__); /* * Ensure that there is not a pending tag switch, as a tag * switch cannot be started if a previous switch is still * pending. / cvmx_pow_tag_sw_wait(); cvmx_pow_tag_sw_full_nocheck(wqp, tag, tag_type, group); } /* * Switch to a NULL tag, which ends any ordering or * synchronization provided by the POW for the current * work queue entry. This operation completes immediately, * so completion should not be waited for. * This function does NOT wait for previous tag switches to complete, * so the caller must ensure that any previous tag switches have completed. / static inline void cvmx_pow_tag_sw_null_nocheck(void) { cvmx_addr_t ptr; cvmx_pow_tag_req_t tag_req; if (CVMX_ENABLE_POW_CHECKS) { cvmx_pow_tag_req_t current_tag; __cvmx_pow_warn_if_pending_switch(__func__); current_tag = cvmx_pow_get_current_tag(); if (current_tag.s.type == CVMX_POW_TAG_TYPE_NULL_NULL) pr_warn("%s called with NULL_NULL tag\n", __func__); if (current_tag.s.type == CVMX_POW_TAG_TYPE_NULL) pr_warn("%s called when we already have a NULL tag\n", __func__); } tag_req.u64 = 0; tag_req.s.op = CVMX_POW_TAG_OP_SWTAG; tag_req.s.type = CVMX_POW_TAG_TYPE_NULL; ptr.u64 = 0; ptr.sio.mem_region = CVMX_IO_SEG; ptr.sio.is_io = 1; ptr.sio.did = CVMX_OCT_DID_TAG_TAG1; cvmx_write_io(ptr.u64, tag_req.u64); / switch to NULL completes immediately / } /* * Switch to a NULL tag, which ends any ordering or * synchronization provided by the POW for the current * work queue entry. This operation completes immediately, * so completion should not be waited for. * This function waits for any pending tag switches to complete * before requesting the switch to NULL. / static inline void cvmx_pow_tag_sw_null(void) { if (CVMX_ENABLE_POW_CHECKS) __cvmx_pow_warn_if_pending_switch(__func__); / * Ensure that there is not a pending tag switch, as a tag * switch cannot be started if a previous switch is still * pending. / cvmx_pow_tag_sw_wait(); cvmx_pow_tag_sw_null_nocheck(); / switch to NULL completes immediately / } /* * Submits work to an input queue. This function updates the work * queue entry in DRAM to match the arguments given. Note that the * tag provided is for the work queue entry submitted, and is * unrelated to the tag that the core currently holds. * * @wqp: pointer to work queue entry to submit. This entry is * updated to match the other parameters * @tag: tag value to be assigned to work queue entry * @tag_type: type of tag * @qos: Input queue to add to. * @grp: group value for the work queue entry. / static inline void cvmx_pow_work_submit(cvmx_wqe_t wqp, uint32_t tag, enum cvmx_pow_tag_type tag_type, uint64_t qos, uint64_t grp) { cvmx_addr_t ptr; cvmx_pow_tag_req_t tag_req; wqp->word1.tag = tag; wqp->word1.tag_type = tag_type; cvmx_wqe_set_qos(wqp, qos); cvmx_wqe_set_grp(wqp, grp); tag_req.u64 = 0; tag_req.s.op = CVMX_POW_TAG_OP_ADDWQ; tag_req.s.type = tag_type; tag_req.s.tag = tag; tag_req.s.qos = qos; tag_req.s.grp = grp; ptr.u64 = 0; ptr.sio.mem_region = CVMX_IO_SEG; ptr.sio.is_io = 1; ptr.sio.did = CVMX_OCT_DID_TAG_TAG1; ptr.sio.offset = cvmx_ptr_to_phys(wqp); /* * SYNC write to memory before the work submit. This is * necessary as POW may read values from DRAM at this time. / CVMX_SYNCWS; cvmx_write_io(ptr.u64, tag_req.u64); } /* * This function sets the group mask for a core. The group mask * indicates which groups each core will accept work from. There are * 16 groups. * * @core_num: core to apply mask to * @mask: Group mask. There are 16 groups, so only bits 0-15 are valid, * representing groups 0-15. * Each 1 bit in the mask enables the core to accept work from * the corresponding group. / static inline void cvmx_pow_set_group_mask(uint64_t core_num, uint64_t mask) { union cvmx_pow_pp_grp_mskx grp_msk; grp_msk.u64 = cvmx_read_csr(CVMX_POW_PP_GRP_MSKX(core_num)); grp_msk.s.grp_msk = mask; cvmx_write_csr(CVMX_POW_PP_GRP_MSKX(core_num), grp_msk.u64); } /* * This function sets POW static priorities for a core. Each input queue has * an associated priority value. * * @core_num: core to apply priorities to * @priority: Vector of 8 priorities, one per POW Input Queue (0-7). * Highest priority is 0 and lowest is 7. A priority value * of 0xF instructs POW to skip the Input Queue when * scheduling to this specific core. * NOTE: priorities should not have gaps in values, meaning * {0,1,1,1,1,1,1,1} is a valid configuration while * {0,2,2,2,2,2,2,2} is not. / static inline void cvmx_pow_set_priority(uint64_t core_num, const uint8_t priority[]) { / POW priorities are supported on CN5xxx and later / if (!OCTEON_IS_MODEL(OCTEON_CN3XXX)) { union cvmx_pow_pp_grp_mskx grp_msk; grp_msk.u64 = cvmx_read_csr(CVMX_POW_PP_GRP_MSKX(core_num)); grp_msk.s.qos0_pri = priority[0]; grp_msk.s.qos1_pri = priority[1]; grp_msk.s.qos2_pri = priority[2]; grp_msk.s.qos3_pri = priority[3]; grp_msk.s.qos4_pri = priority[4]; grp_msk.s.qos5_pri = priority[5]; grp_msk.s.qos6_pri = priority[6]; grp_msk.s.qos7_pri = priority[7]; / Detect gaps between priorities and flag error / { int i; uint32_t prio_mask = 0; for (i = 0; i < 8; i++) if (priority[i] != 0xF) prio_mask \|= 1 << priority[i]; if (prio_mask ^ ((1 << cvmx_pop(prio_mask)) - 1)) { pr_err("POW static priorities should be " "contiguous (0x%llx)\n", (unsigned long long)prio_mask); return; } } cvmx_write_csr(CVMX_POW_PP_GRP_MSKX(core_num), grp_msk.u64); } } /* * Performs a tag switch and then an immediate deschedule. This completes * immediately, so completion must not be waited for. This function does NOT * update the wqe in DRAM to match arguments. * * This function does NOT wait for any prior tag switches to complete, so the * calling code must do this. * * Note the following CAVEAT of the Octeon HW behavior when * re-scheduling DE-SCHEDULEd items whose (next) state is * ORDERED: * - If there are no switches pending at the time that the * HW executes the de-schedule, the HW will only re-schedule * the head of the FIFO associated with the given tag. This * means that in many respects, the HW treats this ORDERED * tag as an ATOMIC tag. Note that in the SWTAG_DESCH * case (to an ORDERED tag), the HW will do the switch * before the deschedule whenever it is possible to do * the switch immediately, so it may often look like * this case. * - If there is a pending switch to ORDERED at the time * the HW executes the de-schedule, the HW will perform * the switch at the time it re-schedules, and will be * able to reschedule any/all of the entries with the * same tag. * Due to this behavior, the RECOMMENDATION to software is * that they have a (next) state of ATOMIC when they * DE-SCHEDULE. If an ORDERED tag is what was really desired, * SW can choose to immediately switch to an ORDERED tag * after the work (that has an ATOMIC tag) is re-scheduled. * Note that since there are never any tag switches pending * when the HW re-schedules, this switch can be IMMEDIATE upon * the reception of the pointer during the re-schedule. * * @tag: New tag value * @tag_type: New tag type * @group: New group value * @no_sched: Control whether this work queue entry will be rescheduled. * - 1 : don't schedule this work * - 0 : allow this work to be scheduled. / static inline void cvmx_pow_tag_sw_desched_nocheck( uint32_t tag, enum cvmx_pow_tag_type tag_type, uint64_t group, uint64_t no_sched) { cvmx_addr_t ptr; cvmx_pow_tag_req_t tag_req; if (CVMX_ENABLE_POW_CHECKS) { cvmx_pow_tag_req_t current_tag; __cvmx_pow_warn_if_pending_switch(__func__); current_tag = cvmx_pow_get_current_tag(); if (current_tag.s.type == CVMX_POW_TAG_TYPE_NULL_NULL) pr_warn("%s called with NULL_NULL tag\n", __func__); if (current_tag.s.type == CVMX_POW_TAG_TYPE_NULL) pr_warn("%s called with NULL tag. Deschedule not allowed from NULL state\n", __func__); if ((current_tag.s.type != CVMX_POW_TAG_TYPE_ATOMIC) && (tag_type != CVMX_POW_TAG_TYPE_ATOMIC)) pr_warn("%s called where neither the before or after tag is ATOMIC\n", __func__); } tag_req.u64 = 0; tag_req.s.op = CVMX_POW_TAG_OP_SWTAG_DESCH; tag_req.s.tag = tag; tag_req.s.type = tag_type; tag_req.s.grp = group; tag_req.s.no_sched = no_sched; ptr.u64 = 0; ptr.sio.mem_region = CVMX_IO_SEG; ptr.sio.is_io = 1; ptr.sio.did = CVMX_OCT_DID_TAG_TAG3; / * since TAG3 is used, this store will clear the local pending * switch bit. / cvmx_write_io(ptr.u64, tag_req.u64); } /* * Performs a tag switch and then an immediate deschedule. This completes * immediately, so completion must not be waited for. This function does NOT * update the wqe in DRAM to match arguments. * * This function waits for any prior tag switches to complete, so the * calling code may call this function with a pending tag switch. * * Note the following CAVEAT of the Octeon HW behavior when * re-scheduling DE-SCHEDULEd items whose (next) state is * ORDERED: * - If there are no switches pending at the time that the * HW executes the de-schedule, the HW will only re-schedule * the head of the FIFO associated with the given tag. This * means that in many respects, the HW treats this ORDERED * tag as an ATOMIC tag. Note that in the SWTAG_DESCH * case (to an ORDERED tag), the HW will do the switch * before the deschedule whenever it is possible to do * the switch immediately, so it may often look like * this case. * - If there is a pending switch to ORDERED at the time * the HW executes the de-schedule, the HW will perform * the switch at the time it re-schedules, and will be * able to reschedule any/all of the entries with the * same tag. * Due to this behavior, the RECOMMENDATION to software is * that they have a (next) state of ATOMIC when they * DE-SCHEDULE. If an ORDERED tag is what was really desired, * SW can choose to immediately switch to an ORDERED tag * after the work (that has an ATOMIC tag) is re-scheduled. * Note that since there are never any tag switches pending * when the HW re-schedules, this switch can be IMMEDIATE upon * the reception of the pointer during the re-schedule. * * @tag: New tag value * @tag_type: New tag type * @group: New group value * @no_sched: Control whether this work queue entry will be rescheduled. * - 1 : don't schedule this work * - 0 : allow this work to be scheduled. / static inline void cvmx_pow_tag_sw_desched(uint32_t tag, enum cvmx_pow_tag_type tag_type, uint64_t group, uint64_t no_sched) { if (CVMX_ENABLE_POW_CHECKS) __cvmx_pow_warn_if_pending_switch(__func__); / Need to make sure any writes to the work queue entry are complete / CVMX_SYNCWS; / * Ensure that there is not a pending tag switch, as a tag * switch cannot be started if a previous switch is still * pending. / cvmx_pow_tag_sw_wait(); cvmx_pow_tag_sw_desched_nocheck(tag, tag_type, group, no_sched); } /* * Deschedules the current work queue entry. * * @no_sched: no schedule flag value to be set on the work queue * entry. If this is set the entry will not be * rescheduled. / static inline void cvmx_pow_desched(uint64_t no_sched) { cvmx_addr_t ptr; cvmx_pow_tag_req_t tag_req; if (CVMX_ENABLE_POW_CHECKS) { cvmx_pow_tag_req_t current_tag; __cvmx_pow_warn_if_pending_switch(__func__); current_tag = cvmx_pow_get_current_tag(); if (current_tag.s.type == CVMX_POW_TAG_TYPE_NULL_NULL) pr_warn("%s called with NULL_NULL tag\n", __func__); if (current_tag.s.type == CVMX_POW_TAG_TYPE_NULL) pr_warn("%s called with NULL tag. Deschedule not expected from NULL state\n", __func__); } / Need to make sure any writes to the work queue entry are complete / CVMX_SYNCWS; tag_req.u64 = 0; tag_req.s.op = CVMX_POW_TAG_OP_DESCH; tag_req.s.no_sched = no_sched; ptr.u64 = 0; ptr.sio.mem_region = CVMX_IO_SEG; ptr.sio.is_io = 1; ptr.sio.did = CVMX_OCT_DID_TAG_TAG3; / * since TAG3 is used, this store will clear the local pending * switch bit. / cvmx_write_io(ptr.u64, tag_req.u64); } /*************************************************** * Define usage of bits within the 32 bit tag values. ****************************************************/ / * Number of bits of the tag used by software. The SW bits are always * a contiguous block of the high starting at bit 31. The hardware * bits are always the low bits. By default, the top 8 bits of the * tag are reserved for software, and the low 24 are set by the IPD * unit. / #define CVMX_TAG_SW_BITS (8) #define CVMX_TAG_SW_SHIFT (32 - CVMX_TAG_SW_BITS) / Below is the list of values for the top 8 bits of the tag. / / * Tag values with top byte of this value are reserved for internal * executive uses. / #define CVMX_TAG_SW_BITS_INTERNAL 0x1 / The executive divides the remaining 24 bits as follows: * - the upper 8 bits (bits 23 - 16 of the tag) define a subgroup * * - the lower 16 bits (bits 15 - 0 of the tag) define are the value * with the subgroup * * Note that this section describes the format of tags generated by * software - refer to the hardware documentation for a description of * the tags values generated by the packet input hardware. Subgroups * are defined here. / / Mask for the value portion of the tag / #define CVMX_TAG_SUBGROUP_MASK 0xFFFF #define CVMX_TAG_SUBGROUP_SHIFT 16 #define CVMX_TAG_SUBGROUP_PKO 0x1 / End of executive tag subgroup definitions / / * The remaining values software bit values 0x2 - 0xff are available * for application use. / /* * This function creates a 32 bit tag value from the two values provided. * * @sw_bits: The upper bits (number depends on configuration) are set * to this value. The remainder of bits are set by the * hw_bits parameter. * * @hw_bits: The lower bits (number depends on configuration) are set * to this value. The remainder of bits are set by the * sw_bits parameter. * * Returns 32 bit value of the combined hw and sw bits. / static inline uint32_t cvmx_pow_tag_compose(uint64_t sw_bits, uint64_t hw_bits) { return ((sw_bits & cvmx_build_mask(CVMX_TAG_SW_BITS)) << CVMX_TAG_SW_SHIFT) \| (hw_bits & cvmx_build_mask(32 - CVMX_TAG_SW_BITS)); } /* * Extracts the bits allocated for software use from the tag * * @tag: 32 bit tag value * * Returns N bit software tag value, where N is configurable with the * CVMX_TAG_SW_BITS define / static inline uint32_t cvmx_pow_tag_get_sw_bits(uint64_t tag) { return (tag >> (32 - CVMX_TAG_SW_BITS)) & cvmx_build_mask(CVMX_TAG_SW_BITS); } /* * * Extracts the bits allocated for hardware use from the tag * * @tag: 32 bit tag value * * Returns (32 - N) bit software tag value, where N is configurable * with the CVMX_TAG_SW_BITS define / static inline uint32_t cvmx_pow_tag_get_hw_bits(uint64_t tag) { return tag & cvmx_build_mask(32 - CVMX_TAG_SW_BITS); } /* * Store the current POW internal state into the supplied * buffer. It is recommended that you pass a buffer of at least * 128KB. The format of the capture may change based on SDK * version and Octeon chip. * * @buffer: Buffer to store capture into * @buffer_size: * The size of the supplied buffer * * Returns Zero on success, negative on failure / extern int cvmx_pow_capture(void buffer, int buffer_size); /** * Dump a POW capture to the console in a human readable format. * * @buffer: POW capture from cvmx_pow_capture() * @buffer_size: * Size of the buffer / extern void cvmx_pow_display(void buffer, int buffer_size); /** * Return the number of POW entries supported by this chip * * Returns Number of POW entries / extern int cvmx_pow_get_num_entries(void); #endif / __CVMX_POW_H__ */

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