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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-06-18 11:16:55 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-06-18 11:16:55 +1000
commit4b337c5f245b6587ba844ac7bb13c313a2912f7b (patch)
tree999c6a6580b76a083c8efb9dabff709d1c49fcd0 /drivers/staging/octeon/cvmx-pow.h
parent492b057c426e4aa747484958e18e9da29003985d (diff)
parent3fe0344faf7fdcb158bd5c1a9aec960a8d70c8e8 (diff)
Merge commit 'origin/master' into next
Diffstat (limited to 'drivers/staging/octeon/cvmx-pow.h')
-rw-r--r--drivers/staging/octeon/cvmx-pow.h1982
1 files changed, 1982 insertions, 0 deletions
diff --git a/drivers/staging/octeon/cvmx-pow.h b/drivers/staging/octeon/cvmx-pow.h
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+++ b/drivers/staging/octeon/cvmx-pow.h
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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 "cvmx-scratch.h"
+#include "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 {
+ /*
+ * 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;
+ } 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 {
+ /* 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;
+ } swork;
+
+ /**
+ * Address for loads to get POW internal status
+ */
+ struct {
+ /* 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;
+ } sstatus;
+
+ /**
+ * Address for memory loads to get POW internal state
+ */
+ struct {
+ /* 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;
+ } smemload;
+
+ /**
+ * Address for index/pointer loads
+ */
+ struct {
+ /* 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;
+ } 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 {
+ /* 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;
+ } 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 {
+ /*
+ * 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;
+ } s_work;
+
+ /**
+ * Result for a POW Status Load (when get_cur==0 and get_wqp==0)
+ */
+ struct {
+ 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;
+ } s_sstatus0;
+
+ /**
+ * Result for a POW Status Load (when get_cur==0 and get_wqp==1)
+ */
+ struct {
+ 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;
+ } s_sstatus1;
+
+ /**
+ * Result for a POW Status Load (when get_cur==1, get_wqp==0, and
+ * get_rev==0)
+ */
+ struct {
+ 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;
+ } s_sstatus2;
+
+ /**
+ * Result for a POW Status Load (when get_cur==1, get_wqp==0, and get_rev==1)
+ */
+ struct {
+ 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;
+ } s_sstatus3;
+
+ /**
+ * Result for a POW Status Load (when get_cur==1, get_wqp==1, and
+ * get_rev==0)
+ */
+ struct {
+ 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;
+ } s_sstatus4;
+
+ /**
+ * Result for a POW Status Load (when get_cur==1, get_wqp==1, and
+ * get_rev==1)
+ */
+ struct {
+ 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;
+ } s_sstatus5;
+
+ /**
+ * Result For POW Memory Load (get_des == 0 and get_wqp == 0)
+ */
+ struct {
+ 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;
+ } s_smemload0;
+
+ /**
+ * Result For POW Memory Load (get_des == 0 and get_wqp == 1)
+ */
+ struct {
+ 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;
+ } s_smemload1;
+
+ /**
+ * Result For POW Memory Load (get_des == 1)
+ */
+ struct {
+ 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;
+ } s_smemload2;
+
+ /**
+ * Result For POW Index/Pointer Load (get_rmt == 0/get_des_get_tail == 0)
+ */
+ struct {
+ 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;
+ } sindexload0;
+
+ /**
+ * Result For POW Index/Pointer Load (get_rmt == 0/get_des_get_tail == 1)
+ */
+ struct {
+ 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;
+ } sindexload1;
+
+ /**
+ * Result For POW Index/Pointer Load (get_rmt == 1/get_des_get_tail == 0)
+ */
+ struct {
+ 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;
+ } sindexload2;
+
+ /**
+ * Result For POW Index/Pointer Load (get_rmt ==
+ * 1/get_des_get_tail == 1)
+ */
+ struct {
+ 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;
+ } sindexload3;
+
+ /**
+ * Response to NULL_RD request loads
+ */
+ struct {
+ 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;
+ } 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 {
+ /* 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;
+ } 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 {
+ /*
+ * 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;
+ } 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_warning("%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_warning("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_warning("%s called with NULL_NULL tag\n",
+ __func__);
+ if (current_tag.s.type == CVMX_POW_TAG_TYPE_NULL)
+ pr_warning("%s called with NULL tag\n", __func__);
+ if ((current_tag.s.type == tag_type)
+ && (current_tag.s.tag == tag))
+ pr_warning("%s called to perform a tag switch to the "
+ "same tag\n",
+ __func__);
+ if (tag_type == CVMX_POW_TAG_TYPE_NULL)
+ pr_warning("%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_warning("%s called with NULL_NULL tag\n",
+ __func__);
+ if ((current_tag.s.type == tag_type)
+ && (current_tag.s.tag == tag))
+ pr_warning("%s called to perform a tag switch to "
+ "the same tag\n",
+ __func__);
+ if (tag_type == CVMX_POW_TAG_TYPE_NULL)
+ pr_warning("%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_warning("%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 immediatly,
+ * so completetion 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_warning("%s called with NULL_NULL tag\n",
+ __func__);
+ if (current_tag.s.type == CVMX_POW_TAG_TYPE_NULL)
+ pr_warning("%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 immediatly,
+ * so completetion 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->qos = qos;
+ wqp->tag = tag;
+ wqp->tag_type = tag_type;
+ wqp->grp = 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
+ * immediatly, 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_warning("%s called with NULL_NULL tag\n",
+ __func__);
+ if (current_tag.s.type == CVMX_POW_TAG_TYPE_NULL)
+ pr_warning("%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_warning("%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
+ * immediatly, 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);
+}
+
+/**
+ * Descchedules 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_warning("%s called with NULL_NULL tag\n",
+ __func__);
+ if (current_tag.s.type == CVMX_POW_TAG_TYPE_NULL)
+ pr_warning("%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 sucess, 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__ */