--- /dev/null
+/*
+ * GICv2m extension for MSI/MSI-x support with a GICv2-based system
+ *
+ * Copyright (C) 2015 Linaro, All rights reserved.
+ *
+ * Author: Christoffer Dall <christoffer.dall@linaro.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* This file implements an emulated GICv2m widget as described in the ARM
+ * Server Base System Architecture (SBSA) specification Version 2.2
+ * (ARM-DEN-0029 v2.2) pages 35-39 without any optional implementation defined
+ * identification registers and with a single non-secure MSI register frame.
+ */
+
+#include "hw/sysbus.h"
+#include "hw/pci/msi.h"
+
+#define TYPE_ARM_GICV2M "arm-gicv2m"
+#define ARM_GICV2M(obj) OBJECT_CHECK(ARMGICv2mState, (obj), TYPE_ARM_GICV2M)
+
+#define GICV2M_NUM_SPI_MAX 128
+
+#define V2M_MSI_TYPER 0x008
+#define V2M_MSI_SETSPI_NS 0x040
+#define V2M_MSI_IIDR 0xFCC
+#define V2M_IIDR0 0xFD0
+#define V2M_IIDR11 0xFFC
+
+#define PRODUCT_ID_QEMU 0x51 /* ASCII code Q */
+
+typedef struct ARMGICv2mState {
+ SysBusDevice parent_obj;
+
+ MemoryRegion iomem;
+ qemu_irq spi[GICV2M_NUM_SPI_MAX];
+
+ uint32_t base_spi;
+ uint32_t num_spi;
+} ARMGICv2mState;
+
+static void gicv2m_set_irq(void *opaque, int irq)
+{
+ ARMGICv2mState *s = (ARMGICv2mState *)opaque;
+
+ qemu_irq_pulse(s->spi[irq]);
+}
+
+static uint64_t gicv2m_read(void *opaque, hwaddr offset,
+ unsigned size)
+{
+ ARMGICv2mState *s = (ARMGICv2mState *)opaque;
+ uint32_t val;
+
+ if (size != 4) {
+ qemu_log_mask(LOG_GUEST_ERROR, "gicv2m_read: bad size %u\n", size);
+ return 0;
+ }
+
+ switch (offset) {
+ case V2M_MSI_TYPER:
+ val = (s->base_spi + 32) << 16;
+ val |= s->num_spi;
+ return val;
+ case V2M_MSI_IIDR:
+ /* We don't have any valid implementor so we leave that field as zero
+ * and we return 0 in the arch revision as per the spec.
+ */
+ return (PRODUCT_ID_QEMU << 20);
+ case V2M_IIDR0 ... V2M_IIDR11:
+ /* We do not implement any optional identification registers and the
+ * mandatory MSI_PIDR2 register reads as 0x0, so we capture all
+ * implementation defined registers here.
+ */
+ return 0;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "gicv2m_read: Bad offset %x\n", (int)offset);
+ return 0;
+ }
+}
+
+static void gicv2m_write(void *opaque, hwaddr offset,
+ uint64_t value, unsigned size)
+{
+ ARMGICv2mState *s = (ARMGICv2mState *)opaque;
+
+ if (size != 2 && size != 4) {
+ qemu_log_mask(LOG_GUEST_ERROR, "gicv2m_write: bad size %u\n", size);
+ return;
+ }
+
+ switch (offset) {
+ case V2M_MSI_SETSPI_NS: {
+ int spi;
+
+ spi = (value & 0x3ff) - (s->base_spi + 32);
+ if (spi >= 0 && spi < s->num_spi) {
+ gicv2m_set_irq(s, spi);
+ }
+ return;
+ }
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "gicv2m_write: Bad offset %x\n", (int)offset);
+ }
+}
+
+static const MemoryRegionOps gicv2m_ops = {
+ .read = gicv2m_read,
+ .write = gicv2m_write,
+ .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static void gicv2m_realize(DeviceState *dev, Error **errp)
+{
+ ARMGICv2mState *s = ARM_GICV2M(dev);
+ int i;
+
+ if (s->num_spi > GICV2M_NUM_SPI_MAX) {
+ error_setg(errp,
+ "requested %u SPIs exceeds GICv2m frame maximum %d",
+ s->num_spi, GICV2M_NUM_SPI_MAX);
+ return;
+ }
+
+ if (s->base_spi + 32 > 1020 - s->num_spi) {
+ error_setg(errp,
+ "requested base SPI %u+%u exceeds max. number 1020",
+ s->base_spi + 32, s->num_spi);
+ return;
+ }
+
+ for (i = 0; i < s->num_spi; i++) {
+ sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->spi[i]);
+ }
+
+ msi_supported = true;
+ kvm_gsi_direct_mapping = true;
+ kvm_msi_via_irqfd_allowed = kvm_irqfds_enabled();
+}
+
+static void gicv2m_init(Object *obj)
+{
+ SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
+ ARMGICv2mState *s = ARM_GICV2M(obj);
+
+ memory_region_init_io(&s->iomem, OBJECT(s), &gicv2m_ops, s,
+ "gicv2m", 0x1000);
+ sysbus_init_mmio(sbd, &s->iomem);
+}
+
+static Property gicv2m_properties[] = {
+ DEFINE_PROP_UINT32("base-spi", ARMGICv2mState, base_spi, 0),
+ DEFINE_PROP_UINT32("num-spi", ARMGICv2mState, num_spi, 64),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void gicv2m_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->props = gicv2m_properties;
+ dc->realize = gicv2m_realize;
+}
+
+static const TypeInfo gicv2m_info = {
+ .name = TYPE_ARM_GICV2M,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(ARMGICv2mState),
+ .instance_init = gicv2m_init,
+ .class_init = gicv2m_class_init,
+};
+
+static void gicv2m_register_types(void)
+{
+ type_register_static(&gicv2m_info);
+}
+
+type_init(gicv2m_register_types)
Code Review / kvmfornfv.git / blobdiff