1 /*
   2  * CDDL HEADER START



   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
  24  * Copyright 2012 Alexey Zaytsev <alexey.zaytsev@gmail.com>
  25  * Copyright (c) 2016 by Delphix. All rights reserved.

  26  */
  27 
  28 /* Based on the NetBSD virtio driver by Minoura Makoto. */
  29 /*
  30  * Copyright (c) 2010 Minoura Makoto.
  31  * All rights reserved.
  32  *
  33  * Redistribution and use in source and binary forms, with or without
  34  * modification, are permitted provided that the following conditions
  35  * are met:
  36  * 1. Redistributions of source code must retain the above copyright
  37  *    notice, this list of conditions and the following disclaimer.
  38  * 2. Redistributions in binary form must reproduce the above copyright
  39  *    notice, this list of conditions and the following disclaimer in the
  40  *    documentation and/or other materials provided with the distribution.
  41  *
  42  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  43  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  44  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  45  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 967 
 968         /* Notify all handlers */
 969         for (i = 0; i < vhc->nhandlers; i++) {
 970                 vhc->vq_handlers[i].vh_func((void *)sc,
 971                     vhc->vq_handlers[i].vh_priv);
 972         }
 973 
 974         return (DDI_INTR_CLAIMED);
 975 }
 976 
 977 /*
 978  * config_handler and vq_handlers may be allocated on stack.
 979  * Take precautions not to loose them.
 980  */
 981 static int
 982 virtio_register_intx(struct virtio_softc *sc,
 983     struct virtio_int_handler *config_handler,
 984     struct virtio_int_handler vq_handlers[])
 985 {
 986         int vq_handler_count;
 987         int config_handler_count = 0;
 988         int actual;
 989         struct virtio_handler_container *vhc;

 990         int ret = DDI_FAILURE;
 991 
 992         /* Walk the handler table to get the number of handlers. */
 993         for (vq_handler_count = 0;
 994             vq_handlers && vq_handlers[vq_handler_count].vh_func;
 995             vq_handler_count++)
 996                 ;
 997 
 998         if (config_handler != NULL)
 999                 config_handler_count = 1;

1000 
1001         vhc = kmem_zalloc(sizeof (struct virtio_handler_container) +
1002             sizeof (struct virtio_int_handler) * vq_handler_count, KM_SLEEP);
1003 
1004         vhc->nhandlers = vq_handler_count;
1005         (void) memcpy(vhc->vq_handlers, vq_handlers,
1006             sizeof (struct virtio_int_handler) * vq_handler_count);
1007 
1008         if (config_handler != NULL) {
1009                 (void) memcpy(&vhc->config_handler, config_handler,
1010                     sizeof (struct virtio_int_handler));
1011         }
1012 
1013         /* Just a single entry for a single interrupt. */
1014         sc->sc_intr_htable = kmem_zalloc(sizeof (ddi_intr_handle_t), KM_SLEEP);
1015 
1016         ret = ddi_intr_alloc(sc->sc_dev, sc->sc_intr_htable,
1017             DDI_INTR_TYPE_FIXED, 0, 1, &actual, DDI_INTR_ALLOC_NORMAL);
1018         if (ret != DDI_SUCCESS) {
1019                 dev_err(sc->sc_dev, CE_WARN,
1020                     "Failed to allocate a fixed interrupt: %d", ret);
1021                 goto out_int_alloc;
1022         }
1023 

1029                 dev_err(sc->sc_dev, CE_WARN, "ddi_intr_get_pri failed");
1030                 goto out_prio;
1031         }
1032 
1033         ret = ddi_intr_add_handler(sc->sc_intr_htable[0],
1034             virtio_intx_dispatch, sc, vhc);
1035         if (ret != DDI_SUCCESS) {
1036                 dev_err(sc->sc_dev, CE_WARN, "ddi_intr_add_handler failed");
1037                 goto out_add_handlers;
1038         }
1039 
1040         sc->sc_int_type = DDI_INTR_TYPE_FIXED;
1041 
1042         return (DDI_SUCCESS);
1043 
1044 out_add_handlers:
1045 out_prio:
1046         (void) ddi_intr_free(sc->sc_intr_htable[0]);
1047 out_int_alloc:
1048         kmem_free(sc->sc_intr_htable, sizeof (ddi_intr_handle_t));
1049         kmem_free(vhc, sizeof (struct virtio_int_handler) *
1050             (vq_handler_count + config_handler_count));
1051         return (ret);
1052 }
1053 
1054 /*
1055  * We find out if we support MSI during this, and the register layout
1056  * depends on the MSI (doh). Don't acces the device specific bits in
1057  * BAR 0 before calling it!
1058  */
1059 int
1060 virtio_register_ints(struct virtio_softc *sc,
1061     struct virtio_int_handler *config_handler,
1062     struct virtio_int_handler vq_handlers[])
1063 {
1064         int ret;
1065         int intr_types;
1066 
1067         /* Default offset until MSI-X is enabled, if ever. */
1068         sc->sc_config_offset = VIRTIO_CONFIG_DEVICE_CONFIG_NOMSIX;
1069 
1070         /* Determine which types of interrupts are supported */

   1 /*
   2  * This file and its contents are supplied under the terms of the
   3  * Common Development and Distribution License ("CDDL"), version 1.0.
   4  * You may only use this file in accordance with the terms of version
   5  * 1.0 of the CDDL.
   6  *
   7  * A full copy of the text of the CDDL should have accompanied this
   8  * source.  A copy of the CDDL is also available via the Internet at
   9  * http://www.illumos.org/license/CDDL.













  10  */
  11 
  12 /*
  13  * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
  14  * Copyright 2012 Alexey Zaytsev <alexey.zaytsev@gmail.com>
  15  * Copyright (c) 2016 by Delphix. All rights reserved.
  16  * Copyright 2017 Joyent, Inc.
  17  */
  18 
  19 /* Based on the NetBSD virtio driver by Minoura Makoto. */
  20 /*
  21  * Copyright (c) 2010 Minoura Makoto.
  22  * All rights reserved.
  23  *
  24  * Redistribution and use in source and binary forms, with or without
  25  * modification, are permitted provided that the following conditions
  26  * are met:
  27  * 1. Redistributions of source code must retain the above copyright
  28  *    notice, this list of conditions and the following disclaimer.
  29  * 2. Redistributions in binary form must reproduce the above copyright
  30  *    notice, this list of conditions and the following disclaimer in the
  31  *    documentation and/or other materials provided with the distribution.
  32  *
  33  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  34  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  35  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  36  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 958 
 959         /* Notify all handlers */
 960         for (i = 0; i < vhc->nhandlers; i++) {
 961                 vhc->vq_handlers[i].vh_func((void *)sc,
 962                     vhc->vq_handlers[i].vh_priv);
 963         }
 964 
 965         return (DDI_INTR_CLAIMED);
 966 }
 967 
 968 /*
 969  * config_handler and vq_handlers may be allocated on stack.
 970  * Take precautions not to loose them.
 971  */
 972 static int
 973 virtio_register_intx(struct virtio_softc *sc,
 974     struct virtio_int_handler *config_handler,
 975     struct virtio_int_handler vq_handlers[])
 976 {
 977         int vq_handler_count;

 978         int actual;
 979         struct virtio_handler_container *vhc;
 980         size_t vhc_sz;
 981         int ret = DDI_FAILURE;
 982 
 983         /* Walk the handler table to get the number of handlers. */
 984         for (vq_handler_count = 0;
 985             vq_handlers && vq_handlers[vq_handler_count].vh_func;
 986             vq_handler_count++)
 987                 ;
 988 
 989         vhc_sz = sizeof (struct virtio_handler_container) +
 990             sizeof (struct virtio_int_handler) * vq_handler_count;
 991         vhc = kmem_zalloc(vhc_sz, KM_SLEEP);
 992 



 993         vhc->nhandlers = vq_handler_count;
 994         (void) memcpy(vhc->vq_handlers, vq_handlers,
 995             sizeof (struct virtio_int_handler) * vq_handler_count);
 996 
 997         if (config_handler != NULL) {
 998                 (void) memcpy(&vhc->config_handler, config_handler,
 999                     sizeof (struct virtio_int_handler));
1000         }
1001 
1002         /* Just a single entry for a single interrupt. */
1003         sc->sc_intr_htable = kmem_zalloc(sizeof (ddi_intr_handle_t), KM_SLEEP);
1004 
1005         ret = ddi_intr_alloc(sc->sc_dev, sc->sc_intr_htable,
1006             DDI_INTR_TYPE_FIXED, 0, 1, &actual, DDI_INTR_ALLOC_NORMAL);
1007         if (ret != DDI_SUCCESS) {
1008                 dev_err(sc->sc_dev, CE_WARN,
1009                     "Failed to allocate a fixed interrupt: %d", ret);
1010                 goto out_int_alloc;
1011         }
1012 

1018                 dev_err(sc->sc_dev, CE_WARN, "ddi_intr_get_pri failed");
1019                 goto out_prio;
1020         }
1021 
1022         ret = ddi_intr_add_handler(sc->sc_intr_htable[0],
1023             virtio_intx_dispatch, sc, vhc);
1024         if (ret != DDI_SUCCESS) {
1025                 dev_err(sc->sc_dev, CE_WARN, "ddi_intr_add_handler failed");
1026                 goto out_add_handlers;
1027         }
1028 
1029         sc->sc_int_type = DDI_INTR_TYPE_FIXED;
1030 
1031         return (DDI_SUCCESS);
1032 
1033 out_add_handlers:
1034 out_prio:
1035         (void) ddi_intr_free(sc->sc_intr_htable[0]);
1036 out_int_alloc:
1037         kmem_free(sc->sc_intr_htable, sizeof (ddi_intr_handle_t));
1038         kmem_free(vhc, vhc_sz);

1039         return (ret);
1040 }
1041 
1042 /*
1043  * We find out if we support MSI during this, and the register layout
1044  * depends on the MSI (doh). Don't acces the device specific bits in
1045  * BAR 0 before calling it!
1046  */
1047 int
1048 virtio_register_ints(struct virtio_softc *sc,
1049     struct virtio_int_handler *config_handler,
1050     struct virtio_int_handler vq_handlers[])
1051 {
1052         int ret;
1053         int intr_types;
1054 
1055         /* Default offset until MSI-X is enabled, if ever. */
1056         sc->sc_config_offset = VIRTIO_CONFIG_DEVICE_CONFIG_NOMSIX;
1057 
1058         /* Determine which types of interrupts are supported */