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 "migration/vmstate.h"
  24 #include "hw/intc/arm_gicv3_its_common.h"
  25 #include "qemu/log.h"
  26 #include "qemu/module.h"
  27 #include "sysemu/kvm.h"
  28
  29 static int gicv3_its_pre_save(void *opaque)
  30 {
  31     GICv3ITSState *s = (GICv3ITSState *)opaque;
  32     GICv3ITSCommonClass *c = ARM_GICV3_ITS_COMMON_GET_CLASS(s);
  33
  34     if (c->pre_save) {
  35         c->pre_save(s);
  36     }
  37
  38     return 0;
  39 }
  40
  41 static int gicv3_its_post_load(void *opaque, int version_id)
  42 {
  43     GICv3ITSState *s = (GICv3ITSState *)opaque;
  44     GICv3ITSCommonClass *c = ARM_GICV3_ITS_COMMON_GET_CLASS(s);
  45
  46     if (c->post_load) {
  47         c->post_load(s);
  48     }
  49     return 0;
  50 }
  51
  52 static const VMStateDescription vmstate_its = {
  53     .name = "arm_gicv3_its",
  54     .pre_save = gicv3_its_pre_save,
  55     .post_load = gicv3_its_post_load,
  56     .priority = MIG_PRI_GICV3_ITS,
  57     .fields = (VMStateField[]) {
  58         VMSTATE_UINT32(ctlr, GICv3ITSState),
  59         VMSTATE_UINT32(iidr, GICv3ITSState),
  60         VMSTATE_UINT64(cbaser, GICv3ITSState),
  61         VMSTATE_UINT64(cwriter, GICv3ITSState),
  62         VMSTATE_UINT64(creadr, GICv3ITSState),
  63         VMSTATE_UINT64_ARRAY(baser, GICv3ITSState, 8),
  64         VMSTATE_END_OF_LIST()
  65     },
  66 };
  67
  68 static MemTxResult gicv3_its_trans_read(void *opaque, hwaddr offset,
  69                                         uint64_t *data, unsigned size,
  70                                         MemTxAttrs attrs)
  71 {
  72     qemu_log_mask(LOG_GUEST_ERROR, "ITS read at offset 0x%"PRIx64"\n", offset);
  73     *data = 0;
  74     return MEMTX_OK;
  75 }
  76
  77 static MemTxResult gicv3_its_trans_write(void *opaque, hwaddr offset,
  78                                          uint64_t value, unsigned size,
  79                                          MemTxAttrs attrs)
  80 {
  81     if (offset == 0x0040 && ((size == 2) || (size == 4))) {
  82         GICv3ITSState *s = ARM_GICV3_ITS_COMMON(opaque);
  83         GICv3ITSCommonClass *c = ARM_GICV3_ITS_COMMON_GET_CLASS(s);
  84         int ret = c->send_msi(s, le64_to_cpu(value), attrs.requester_id);
  85
  86         if (ret <= 0) {
  87             qemu_log_mask(LOG_GUEST_ERROR,
  88                           "ITS: Error sending MSI: %s\n", strerror(-ret));
  89         }
  90     } else {
  91         qemu_log_mask(LOG_GUEST_ERROR,
  92                       "ITS write at bad offset 0x%"PRIx64"\n", offset);
  93     }
  94     return MEMTX_OK;
  95 }
  96
  97 static const MemoryRegionOps gicv3_its_trans_ops = {
  98     .read_with_attrs = gicv3_its_trans_read,
  99     .write_with_attrs = gicv3_its_trans_write,
 100     .endianness = DEVICE_NATIVE_ENDIAN,
 101 };
 102
 103 void gicv3_its_init_mmio(GICv3ITSState *s, const MemoryRegionOps *ops,
 104                          const MemoryRegionOps *tops)
 105 {
 106     SysBusDevice *sbd = SYS_BUS_DEVICE(s);
 107
 108     memory_region_init_io(&s->iomem_its_cntrl, OBJECT(s), ops, s,
 109                           "control", ITS_CONTROL_SIZE);
 110     memory_region_init_io(&s->iomem_its_translation, OBJECT(s),
 111                           tops ? tops : &gicv3_its_trans_ops, s,
 112                           "translation", ITS_TRANS_SIZE);
 113
 114     /* Our two regions are always adjacent, therefore we now combine them
 115      * into a single one in order to make our users' life easier.
 116      */
 117     memory_region_init(&s->iomem_main, OBJECT(s), "gicv3_its", ITS_SIZE);
 118     memory_region_add_subregion(&s->iomem_main, 0, &s->iomem_its_cntrl);
 119     memory_region_add_subregion(&s->iomem_main, ITS_CONTROL_SIZE,
 120                                 &s->iomem_its_translation);
 121     sysbus_init_mmio(sbd, &s->iomem_main);
 122
 123     msi_nonbroken = true;
 124 }
 125
 126 static void gicv3_its_common_reset_hold(Object *obj)
 127 {
 128     GICv3ITSState *s = ARM_GICV3_ITS_COMMON(obj);
 129
 130     s->ctlr = 0;
 131     s->cbaser = 0;
 132     s->cwriter = 0;
 133     s->creadr = 0;
 134     s->iidr = 0;
 135     memset(&s->baser, 0, sizeof(s->baser));
 136 }
 137
 138 static void gicv3_its_common_class_init(ObjectClass *klass, void *data)
 139 {
 140     DeviceClass *dc = DEVICE_CLASS(klass);
 141     ResettableClass *rc = RESETTABLE_CLASS(klass);
 142
 143     rc->phases.hold = gicv3_its_common_reset_hold;
 144     dc->vmsd = &vmstate_its;
 145 }
 146
 147 static const TypeInfo gicv3_its_common_info = {
 148     .name = TYPE_ARM_GICV3_ITS_COMMON,
 149     .parent = TYPE_SYS_BUS_DEVICE,
 150     .instance_size = sizeof(GICv3ITSState),
 151     .class_size = sizeof(GICv3ITSCommonClass),
 152     .class_init = gicv3_its_common_class_init,
 153     .abstract = true,
 154 };
 155
 156 static void gicv3_its_common_register_types(void)
 157 {
 158     type_register_static(&gicv3_its_common_info);
 159 }
 160
 161 type_init(gicv3_its_common_register_types)
 162
 163 const char *its_class_name(void)
 164 {
 165     if (kvm_irqchip_in_kernel()) {
 166         /* KVM implementation requires this capability */
 167         return kvm_direct_msi_enabled() ? "arm-its-kvm" : NULL;
 168     } else {
 169         /* Software emulation based model */
 170         return "arm-gicv3-its";
 171     }
 172 }