ccp_lsb.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2017 Conrad Meyer <cem@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/types.h>
   33 #include <sys/bus.h>
   34 #include <sys/malloc.h>
   35 #include <sys/sysctl.h>
   36 
   37 #include <opencrypto/xform.h>
   38 
   39 #include "ccp.h"
   40 #include "ccp_lsb.h"
   41 
   42 void
   43 ccp_queue_decode_lsb_regions(struct ccp_softc *sc, uint64_t lsbmask,
   44     unsigned queue)
   45 {
   46         struct ccp_queue *qp;
   47         unsigned i;
   48 
   49         qp = &sc->queues[queue];
   50 
   51         qp->lsb_mask = 0;
   52 
   53         for (i = 0; i < MAX_LSB_REGIONS; i++) {
   54                 if (((1 << queue) & lsbmask) != 0)
   55                         qp->lsb_mask |= (1 << i);
   56                 lsbmask >>= MAX_HW_QUEUES;
   57         }
   58 
   59         /*
   60          * Ignore region 0, which has special entries that cannot be used
   61          * generally.
   62          */
   63         qp->lsb_mask &= ~(1 << 0);
   64 }
   65 
   66 /*
   67  * Look for a private LSB for each queue.  There are 7 general purpose LSBs
   68  * total and 5 queues.  PSP will reserve some of both.  Firmware limits some
   69  * queues' access to some LSBs; we hope it is fairly sane and just use a dumb
   70  * greedy algorithm to assign LSBs to queues.
   71  */
   72 void
   73 ccp_assign_lsb_regions(struct ccp_softc *sc, uint64_t lsbmask)
   74 {
   75         unsigned q, i;
   76 
   77         for (q = 0; q < nitems(sc->queues); q++) {
   78                 if (((1 << q) & sc->valid_queues) == 0)
   79                         continue;
   80 
   81                 sc->queues[q].private_lsb = -1;
   82 
   83                 /* Intentionally skip specialized 0th LSB */
   84                 for (i = 1; i < MAX_LSB_REGIONS; i++) {
   85                         if ((lsbmask &
   86                             (1ull << (q + (MAX_HW_QUEUES * i)))) != 0) {
   87                                 sc->queues[q].private_lsb = i;
   88                                 lsbmask &= ~(0x1Full << (MAX_HW_QUEUES * i));
   89                                 break;
   90                         }
   91                 }
   92 
   93                 if (i == MAX_LSB_REGIONS) {
   94                         device_printf(sc->dev,
   95                             "Ignoring queue %u with no private LSB\n", q);
   96                         sc->valid_queues &= ~(1 << q);
   97                 }
   98         }
   99 }

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FreeBSD/Linux Kernel Cross Reference sys/crypto/ccp/ccp_lsb.c

FreeBSD/Linux Kernel Cross Reference
sys/crypto/ccp/ccp_lsb.c