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Add SDT probes virtqueue::enqueue_segments:{entry,return}

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This allows one to be able to map the sglist entries passed into the
vq_ring_enqueue_segments() function to the segment indexes used in
the virtqueue.

This function normally gets inlined and may not available via FBT
probes.

Differential Revision: https://reviews.freebsd.org/D31620
This commit is contained in:
Stephen J. Kiernan 2021-08-27 13:08:59 -04:00
parent b54eec8366
commit fd80208a5f
1 changed files with 10 additions and 0 deletions
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10
sys/dev/virtio/virtqueue.c
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@ -38,6 +38,7 @@ __FBSDID("$FreeBSD$");
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/sdt.h>
#include <sys/sglist.h>
#include <vm/vm.h>
#include <vm/pmap.h>
@ -137,6 +138,11 @@ static int vq_ring_must_notify_host(struct virtqueue *);
static void vq_ring_notify_host(struct virtqueue *);
static void vq_ring_free_chain(struct virtqueue *, uint16_t);
SDT_PROVIDER_DEFINE(virtqueue);
SDT_PROBE_DEFINE6(virtqueue, , enqueue_segments, entry, "struct virtqueue *",
"struct vring_desc *", "uint16_t", "struct sglist *", "int", "int");
SDT_PROBE_DEFINE1(virtqueue, , enqueue_segments, return, "uint16_t");
#define vq_modern(_vq) (((_vq)->vq_flags & VIRTQUEUE_FLAG_MODERN) != 0)
#define vq_htog16(_vq, _val) virtio_htog16(vq_modern(_vq), _val)
#define vq_htog32(_vq, _val) virtio_htog32(vq_modern(_vq), _val)
@ -703,6 +709,9 @@ vq_ring_enqueue_segments(struct virtqueue *vq, struct vring_desc *desc,
int i, needed;
uint16_t idx;
SDT_PROBE6(virtqueue, , enqueue_segments, entry, vq, desc, head_idx,
sg, readable, writable);
needed = readable + writable;
for (i = 0, idx = head_idx, seg = sg->sg_segs;
@ -722,6 +731,7 @@ vq_ring_enqueue_segments(struct virtqueue *vq, struct vring_desc *desc,
dp->flags |= vq_gtoh16(vq, VRING_DESC_F_WRITE);
}
SDT_PROBE1(virtqueue, , enqueue_segments, return, idx);
return (idx);
}