hw/intc/arm_gicv3_its_common.c

   1 /*
   2  * ITS base class for a GICv3-based system
   3  *
   4  * Copyright (c) 2015 Samsung Electronics Co., Ltd.
   5  * Written by Pavel Fedin
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "hw/pci/msi.h"
  23 #include "hw/intc/arm_gicv3_its_common.h"
  24 #include "qemu/log.h"
  25
  26 static int gicv3_its_pre_save(void *opaque)
  27 {
  28     GICv3ITSState *s = (GICv3ITSState *)opaque;
  29     GICv3ITSCommonClass *c = ARM_GICV3_ITS_COMMON_GET_CLASS(s);
  30
  31     if (c->pre_save) {
  32         c->pre_save(s);
  33     }
  34
  35     return 0;
  36 }
  37
  38 static int gicv3_its_post_load(void *opaque, int version_id)
  39 {
  40     GICv3ITSState *s = (GICv3ITSState *)opaque;
  41     GICv3ITSCommonClass *c = ARM_GICV3_ITS_COMMON_GET_CLASS(s);
  42
  43     if (c->post_load) {
  44         c->post_load(s);
  45     }
  46     return 0;
  47 }
  48
  49 static const VMStateDescription vmstate_its = {
  50     .name = "arm_gicv3_its",
  51     .pre_save = gicv3_its_pre_save,
  52     .post_load = gicv3_its_post_load,
  53     .priority = MIG_PRI_GICV3_ITS,
  54     .fields = (VMStateField[]) {
  55         VMSTATE_UINT32(ctlr, GICv3ITSState),
  56         VMSTATE_UINT32(iidr, GICv3ITSState),
  57         VMSTATE_UINT64(cbaser, GICv3ITSState),
  58         VMSTATE_UINT64(cwriter, GICv3ITSState),
  59         VMSTATE_UINT64(creadr, GICv3ITSState),
  60         VMSTATE_UINT64_ARRAY(baser, GICv3ITSState, 8),
  61         VMSTATE_END_OF_LIST()
  62     },
  63 };
  64
  65 static MemTxResult gicv3_its_trans_read(void *opaque, hwaddr offset,
  66                                         uint64_t *data, unsigned size,
  67                                         MemTxAttrs attrs)
  68 {
  69     qemu_log_mask(LOG_GUEST_ERROR, "ITS read at offset 0x%"PRIx64"\n", offset);
  70     *data = 0;
  71     return MEMTX_OK;
  72 }
  73
  74 static MemTxResult gicv3_its_trans_write(void *opaque, hwaddr offset,
  75                                          uint64_t value, unsigned size,
  76                                          MemTxAttrs attrs)
  77 {
  78     if (offset == 0x0040 && ((size == 2) || (size == 4))) {
  79         GICv3ITSState *s = ARM_GICV3_ITS_COMMON(opaque);
  80         GICv3ITSCommonClass *c = ARM_GICV3_ITS_COMMON_GET_CLASS(s);
  81         int ret = c->send_msi(s, le64_to_cpu(value), attrs.requester_id);
  82
  83         if (ret <= 0) {
  84             qemu_log_mask(LOG_GUEST_ERROR,
  85                           "ITS: Error sending MSI: %s\n", strerror(-ret));
  86         }
  87     } else {
  88         qemu_log_mask(LOG_GUEST_ERROR,
  89                       "ITS write at bad offset 0x%"PRIx64"\n", offset);
  90     }
  91     return MEMTX_OK;
  92 }
  93
  94 static const MemoryRegionOps gicv3_its_trans_ops = {
  95     .read_with_attrs = gicv3_its_trans_read,
  96     .write_with_attrs = gicv3_its_trans_write,
  97     .endianness = DEVICE_NATIVE_ENDIAN,
  98 };
  99
 100 void gicv3_its_init_mmio(GICv3ITSState *s, const MemoryRegionOps *ops)
 101 {
 102     SysBusDevice *sbd = SYS_BUS_DEVICE(s);
 103
 104     memory_region_init_io(&s->iomem_its_cntrl, OBJECT(s), ops, s,
 105                           "control", ITS_CONTROL_SIZE);
 106     memory_region_init_io(&s->iomem_its_translation, OBJECT(s),
 107                           &gicv3_its_trans_ops, s,
 108                           "translation", ITS_TRANS_SIZE);
 109
 110     /* Our two regions are always adjacent, therefore we now combine them
 111      * into a single one in order to make our users' life easier.
 112      */
 113     memory_region_init(&s->iomem_main, OBJECT(s), "gicv3_its", ITS_SIZE);
 114     memory_region_add_subregion(&s->iomem_main, 0, &s->iomem_its_cntrl);
 115     memory_region_add_subregion(&s->iomem_main, ITS_CONTROL_SIZE,
 116                                 &s->iomem_its_translation);
 117     sysbus_init_mmio(sbd, &s->iomem_main);
 118
 119     msi_nonbroken = true;
 120 }
 121
 122 static void gicv3_its_common_reset(DeviceState *dev)
 123 {
 124     GICv3ITSState *s = ARM_GICV3_ITS_COMMON(dev);
 125
 126     s->ctlr = 0;
 127     s->cbaser = 0;
 128     s->cwriter = 0;
 129     s->creadr = 0;
 130     s->iidr = 0;
 131     memset(&s->baser, 0, sizeof(s->baser));
 132 }
 133
 134 static void gicv3_its_common_class_init(ObjectClass *klass, void *data)
 135 {
 136     DeviceClass *dc = DEVICE_CLASS(klass);
 137
 138     dc->reset = gicv3_its_common_reset;
 139     dc->vmsd = &vmstate_its;
 140 }
 141
 142 static const TypeInfo gicv3_its_common_info = {
 143     .name = TYPE_ARM_GICV3_ITS_COMMON,
 144     .parent = TYPE_SYS_BUS_DEVICE,
 145     .instance_size = sizeof(GICv3ITSState),
 146     .class_size = sizeof(GICv3ITSCommonClass),
 147     .class_init = gicv3_its_common_class_init,
 148     .abstract = true,
 149 };
 150
 151 static void gicv3_its_common_register_types(void)
 152 {
 153     type_register_static(&gicv3_its_common_info);
 154 }
 155
 156 type_init(gicv3_its_common_register_types)