Date: Fri, 27 Aug 2021 17:09:09 GMT
From: "Stephen J. Kiernan" <stevek@FreeBSD.org>
To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org
Subject: git: fd80208a5f92 - main - Add SDT probes virtqueue::enqueue_segments:{entry, return}
Message-ID: <202108271709.17RH99T3009617@gitrepo.freebsd.org>
next in thread | raw e-mail | index | archive | help
The branch main has been updated by stevek: URL: https://cgit.FreeBSD.org/src/commit/?id=fd80208a5f92a60381d7bb7b5225bcdc38ab6fd5 commit fd80208a5f92a60381d7bb7b5225bcdc38ab6fd5 Author: Stephen J. Kiernan <stevek@FreeBSD.org> AuthorDate: 2021-08-27 17:08:59 +0000 Commit: Stephen J. Kiernan <stevek@FreeBSD.org> CommitDate: 2021-08-27 17:08:59 +0000 Add SDT probes virtqueue::enqueue_segments:{entry,return} 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 --- sys/dev/virtio/virtqueue.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/sys/dev/virtio/virtqueue.c b/sys/dev/virtio/virtqueue.c index 14c2088b70a8..59aefb31d9ac 100644 --- a/sys/dev/virtio/virtqueue.c +++ b/sys/dev/virtio/virtqueue.c @@ -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); }
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?202108271709.17RH99T3009617>