[PATCH v2 19/19] virtio-mem: Add trace events

David Hildenbrand
2020-05-20T12:33:34Z

Let's add some trace events that might come in handy later.

Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
hw/virtio/trace-events | 10 ++++++++++
hw/virtio/virtio-mem.c | 10 +++++++++-
2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events
index e83500bee9..c40ad5ea27 100644
--- a/hw/virtio/trace-events
+++ b/hw/virtio/trace-events
@@ -73,3 +73,13 @@ virtio_iommu_get_domain(uint32_t domain_id) "Alloc domain=%d"
virtio_iommu_put_domain(uint32_t domain_id) "Free domain=%d"
virtio_iommu_translate_out(uint64_t virt_addr, uint64_t phys_addr, uint32_t sid) "0x%"PRIx64" -> 0x%"PRIx64 " for sid=%d"
virtio_iommu_report_fault(uint8_t reason, uint32_t flags, uint32_t endpoint, uint64_t addr) "FAULT reason=%d flags=%d endpoint=%d address =0x%"PRIx64
+
+# virtio-mem.c
+virtio_mem_send_response(uint16_t type) "type=%" PRIu16
+virtio_mem_plug_request(uint64_t addr, uint16_t nb_blocks) "addr=0x%" PRIx64 " nb_blocks=%" PRIu16
+virtio_mem_unplug_request(uint64_t addr, uint16_t nb_blocks) "addr=0x%" PRIx64 " nb_blocks=%" PRIu16
+virtio_mem_unplugged_all(void) ""
+virtio_mem_unplug_all_request(void) ""
+virtio_mem_resized_usable_region(uint64_t old_size, uint64_t new_size) "old_size=0x%" PRIx64 "new_size=0x%" PRIx64
+virtio_mem_state_request(uint64_t addr, uint16_t nb_blocks) "addr=0x%" PRIx64 " nb_blocks=%" PRIu16
+virtio_mem_state_response(uint16_t state) "state=%" PRIu16
diff --git a/hw/virtio/virtio-mem.c b/hw/virtio/virtio-mem.c
index d863f336e8..87502b9989 100644
--- a/hw/virtio/virtio-mem.c
+++ b/hw/virtio/virtio-mem.c
@@ -30,6 +30,7 @@
#include "hw/boards.h"
#include "hw/qdev-properties.h"
#include "config-devices.h"
+#include "trace.h"

/*
* Use QEMU_VMALLOC_ALIGN, so no THP will have to be split when unplugging
@@ -94,6 +95,7 @@ static void virtio_mem_send_response(VirtIOMEM *vmem, VirtQueueElement *elem,
VirtIODevice *vdev = VIRTIO_DEVICE(vmem);
VirtQueue *vq = vmem->vq;

+ trace_virtio_mem_send_response(le16_to_cpu(resp->type));
iov_from_buf(elem->in_sg, elem->in_num, 0, resp, sizeof(*resp));

virtqueue_push(vq, elem, sizeof(*resp));
@@ -188,6 +190,7 @@ static void virtio_mem_plug_request(VirtIOMEM *vmem, VirtQueueElement *elem,
const uint16_t nb_blocks = le16_to_cpu(req->u.plug.nb_blocks);
uint16_t type;

+ trace_virtio_mem_plug_request(gpa, nb_blocks);
type = virtio_mem_state_change_request(vmem, gpa, nb_blocks, true);
virtio_mem_send_response_simple(vmem, elem, type);
}
@@ -199,6 +202,7 @@ static void virtio_mem_unplug_request(VirtIOMEM *vmem, VirtQueueElement *elem,
const uint16_t nb_blocks = le16_to_cpu(req->u.unplug.nb_blocks);
uint16_t type;

+ trace_virtio_mem_unplug_request(gpa, nb_blocks);
type = virtio_mem_state_change_request(vmem, gpa, nb_blocks, false);
virtio_mem_send_response_simple(vmem, elem, type);
}
@@ -215,6 +219,7 @@ static void virtio_mem_resize_usable_region(VirtIOMEM *vmem,
return;
}

+ trace_virtio_mem_resized_usable_region(vmem->usable_region_size, newsize);
vmem->usable_region_size = newsize;
}

@@ -237,7 +242,7 @@ static int virtio_mem_unplug_all(VirtIOMEM *vmem)
vmem->size = 0;
notifier_list_notify(&vmem->size_change_notifiers, &vmem->size);
}
-
+ trace_virtio_mem_unplugged_all();
virtio_mem_resize_usable_region(vmem, vmem->requested_size, true);
return 0;
}
@@ -245,6 +250,7 @@ static int virtio_mem_unplug_all(VirtIOMEM *vmem)
static void virtio_mem_unplug_all_request(VirtIOMEM *vmem,
VirtQueueElement *elem)
{
+ trace_virtio_mem_unplug_all_request();
if (virtio_mem_unplug_all(vmem)) {
virtio_mem_send_response_simple(vmem, elem, VIRTIO_MEM_RESP_BUSY);
} else {
@@ -262,6 +268,7 @@ static void virtio_mem_state_request(VirtIOMEM *vmem, VirtQueueElement *elem,
.type = cpu_to_le16(VIRTIO_MEM_RESP_ACK),
};

+ trace_virtio_mem_state_request(gpa, nb_blocks);
if (!virtio_mem_valid_range(vmem, gpa, size)) {
virtio_mem_send_response_simple(vmem, elem, VIRTIO_MEM_RESP_ERROR);
return;
@@ -274,6 +281,7 @@ static void virtio_mem_state_request(VirtIOMEM *vmem, VirtQueueElement *elem,
} else {
resp.u.state.state = cpu_to_le16(VIRTIO_MEM_STATE_MIXED);
}
+ trace_virtio_mem_state_response(le16_to_cpu(resp.u.state.state));
virtio_mem_send_response(vmem, elem, &resp);
}

--
2.25.4