Uses a virtual device to trigger the hypertrace channel event.
Signed-off-by: Lluís Vilanova <vilan...@ac.upc.edu>
---
hypertrace/Makefile.objs | 4 +
hypertrace/softmmu.c | 237 ++++++++++++++++++++++++++++++++++++++++++++++
include/hw/pci/pci.h | 2
3 files changed, 243 insertions(+)
create mode 100644 hypertrace/softmmu.c
diff --git a/hypertrace/Makefile.objs b/hypertrace/Makefile.objs
index 2c27ad819a..1e5b8d0be2 100644
--- a/hypertrace/Makefile.objs
+++ b/hypertrace/Makefile.objs
@@ -1,10 +1,14 @@
# -*- mode: makefile -*-
target-obj-$(CONFIG_USER_ONLY) += user.o
+ifdef CONFIG_PCI
+target-obj-$(CONFIG_SOFTMMU) += softmmu.o
+endif
target-obj-y += common.o
$(obj)/user.o: $(obj)/emit.c
$(obj)/common.o: $(obj)/emit.c
+$(obj)/softmmu.o: $(obj)/emit.c
$(obj)/emit.c: $(obj)/emit.c-timestamp $(BUILD_DIR)/config-host.mak
@cmp $< $@ >/dev/null 2>&1 || cp $< $@
diff --git a/hypertrace/softmmu.c b/hypertrace/softmmu.c
new file mode 100644
index 0000000000..4048c7e0ef
--- /dev/null
+++ b/hypertrace/softmmu.c
@@ -0,0 +1,237 @@
+/*
+ * QEMU-side management of hypertrace in softmmu emulation.
+ *
+ * Copyright (C) 2016-2017 Lluís Vilanova <vilan...@ac.upc.edu>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+/*
+ * Implementation details
+ * ======================
+ *
+ * There are 3 channels, each a BAR of a virtual device that can be used
through
+ * MMIO.
+ *
+ *
+ * - Configuration channel: Exposes configuration parameters.
+ *
+ * - Data channel: Lets guests write argument values. Each guest client should
+ * use a different offset to avoid concurrency problems.
+ *
+ * - Control channel: Triggers the hypertrace event on a write, providing the
+ * first argument. Offset in the control channel sets the offset in the data
+ * channel.
+ */
+
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "hypertrace/common.h"
+#include "hypertrace/trace.h"
+#include "hw/pci/pci.h"
+#include "migration/blocker.h"
+#include "qapi/error.h"
+#include "qemu/error-report.h"
+
+
+typedef struct HypertraceState {
+ PCIDevice dev;
+
+ uint64_t max_clients;
+ struct hypertrace_config hconfig;
+
+ MemoryRegion config;
+ void *config_ptr;
+ MemoryRegion data;
+ void *data_ptr;
+ MemoryRegion control;
+ void *control_ptr;
+
+ Error *migration_blocker;
+} HypertraceState;
+
+
+static uint64_t hypertrace_control_io_read(void *opaque, hwaddr addr,
+ unsigned size)
+{
+ uint64_t res;
+ HypertraceState *s = opaque;
+ char *mem = &((char *)s->control_ptr)[addr];
+
+ switch (size) {
+ case 1:
+ {
+ res = ((uint8_t *)mem)[0];
+ break;
+ }
+ case 2:
+ {
+ res = ((uint16_t *)mem)[0];
+ break;
+ }
+ case 4:
+ {
+ res = ((uint32_t *)mem)[0];
+ break;
+ }
+ case 8:
+ {
+ res = ((uint64_t *)mem)[0];
+ break;
+ }
+ default:
+ error_report("error: hypertrace: Unexpected read of size %d", size);
+ abort();
+ }
+
+ return res;
+}
+
+static void hypertrace_control_io_write(void *opaque, hwaddr addr,
+ uint64_t data, unsigned size)
+{
+ HypertraceState *s = opaque;
+ char *mem = &((char *)s->control_ptr)[addr];
+
+ switch (size) {
+ case 1:
+ {
+ uint8_t *res = (uint8_t *)mem;
+ *res = (uint8_t)data;
+ break;
+ }
+ case 2:
+ {
+ uint16_t *res = (uint16_t *)mem;
+ *res = (uint16_t)data;
+ break;
+ }
+ case 4:
+ {
+ uint32_t *res = (uint32_t *)mem;
+ *res = (uint32_t)data;
+ break;
+ }
+ case 8:
+ {
+ uint64_t *res = (uint64_t *)mem;
+ *res = (uint64_t)data;
+ break;
+ }
+ default:
+ error_report("error: hypertrace: Unexpected write of size %d", size);
+ abort();
+ }
+
+ if ((addr + size) % sizeof(uint64_t) == 0) {
+ uint64_t client = addr / sizeof(uint64_t);
+ uint64_t vcontrol = ((uint64_t *)s->control_ptr)[client];
+ uint64_t *data_ptr = (uint64_t *)s->data_ptr;
+ data_ptr = &data_ptr[client * s->hconfig.client_data_size];
+ hypertrace_emit(current_cpu, vcontrol, data_ptr);
+ }
+}
+
+static const MemoryRegionOps hypertrace_control_ops = {
+ .read = &hypertrace_control_io_read,
+ .write = &hypertrace_control_io_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+ .impl = {
+ .min_access_size = 1,
+ .max_access_size = 8,
+ },
+};
+
+
+static void hypertrace_realize(PCIDevice *dev, Error **errp)
+{
+ Error *local_err = NULL;
+ struct hypertrace_config *config;
+ HypertraceState *s = DO_UPCAST(HypertraceState, dev, dev);
+ Error *err = NULL;
+
+ if (s->max_clients < 1) {
+ error_setg(errp, "hypertrace: must have at least one client");
+ return;
+ }
+
+ hypertrace_init_config(&s->hconfig, s->max_clients);
+
+ error_setg(&s->migration_blocker,
+ "The 'hypertrace' device cannot be migrated");
+ migrate_add_blocker(s->migration_blocker, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ error_free(s->migration_blocker);
+ return;
+ }
+
+ pci_set_word(s->dev.config + PCI_COMMAND,
+ PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
+
+ /* config channel */
+ memory_region_init_ram(&s->config, OBJECT(s), "hypertrace.config",
+ TARGET_PAGE_SIZE, &err);
+ if (err) {
+ error_propagate(errp, err);
+ return;
+ }
+ pci_register_bar(&s->dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->config);
+ s->config_ptr = qemu_map_ram_ptr(s->config.ram_block, 0);
+ config = s->config_ptr;
+ config->max_clients = tswap64(s->hconfig.max_clients);
+ config->client_args = tswap64(s->hconfig.client_args);
+ config->client_data_size = tswap64(s->hconfig.client_data_size);
+ config->control_size = tswap64(s->hconfig.control_size);
+ config->data_size = tswap64(s->hconfig.data_size);
+
+ /* data channel */
+ memory_region_init_ram(&s->data, OBJECT(s), "hypertrace.data",
+ s->hconfig.data_size, &err);
+ if (err) {
+ error_propagate(errp, err);
+ return;
+ }
+ pci_register_bar(&s->dev, 1, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->data);
+ s->data_ptr = qemu_map_ram_ptr(s->data.ram_block, 0);
+
+ /* control channel */
+ memory_region_init_io(&s->control, OBJECT(s), &hypertrace_control_ops, s,
+ "hypertrace.control", s->hconfig.control_size);
+ pci_register_bar(&s->dev, 2, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->control);
+ s->control_ptr = qemu_map_ram_ptr(s->control.ram_block, 0);
+}
+
+
+static Property hypertrace_properties[] = {
+ DEFINE_PROP_UINT64("max-clients", HypertraceState, max_clients, 1),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void hypertrace_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+
+ k->realize = hypertrace_realize;
+ k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
+ k->device_id = PCI_DEVICE_ID_HYPERTRACE;
+ k->class_id = PCI_CLASS_MEMORY_RAM;
+ dc->desc = "Hypertrace communication channel",
+ dc->props = hypertrace_properties;
+}
+
+static TypeInfo hypertrace_info = {
+ .name = "hypertrace",
+ .parent = TYPE_PCI_DEVICE,
+ .instance_size = sizeof(HypertraceState),
+ .class_init = hypertrace_class_init,
+};
+
+static void hypertrace_register_types(void)
+{
+ type_register_static(&hypertrace_info);
+}
+
+type_init(hypertrace_register_types)
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index e598b095eb..3910a9b89f 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -84,6 +84,8 @@
#define PCI_DEVICE_ID_VIRTIO_9P 0x1009
#define PCI_DEVICE_ID_VIRTIO_VSOCK 0x1012
+#define PCI_DEVICE_ID_HYPERTRACE 0x10f0
+
#define PCI_VENDOR_ID_REDHAT 0x1b36
#define PCI_DEVICE_ID_REDHAT_BRIDGE 0x0001
#define PCI_DEVICE_ID_REDHAT_SERIAL 0x0002
