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| author | Tiwei Bie <tiwei.bie@intel.com> | 2018-11-21 11:03:22 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-11-27 07:17:39 +0100 |
| commit | 4d6a105eb534b8f1a5ef9215deb1932cd8abacc2 (patch) | |
| tree | 235ca0925d81e83dee4e0bbdcd6e3ebab4cfd336 /drivers/virtio | |
| parent | virtio_ring: put split ring fields in a sub struct (diff) | |
| download | linux-4d6a105eb534b8f1a5ef9215deb1932cd8abacc2.tar.xz linux-4d6a105eb534b8f1a5ef9215deb1932cd8abacc2.zip | |
virtio_ring: introduce debug helpers
Introduce debug helpers for last_add_time update, check and
invalid. They will be used by packed ring too.
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/virtio_ring.c | 49 |
1 files changed, 27 insertions, 22 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 0b97e5c79654..10d407910aa2 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -44,6 +44,26 @@ } while (0) #define END_USE(_vq) \ do { BUG_ON(!(_vq)->in_use); (_vq)->in_use = 0; } while(0) +#define LAST_ADD_TIME_UPDATE(_vq) \ + do { \ + ktime_t now = ktime_get(); \ + \ + /* No kick or get, with .1 second between? Warn. */ \ + if ((_vq)->last_add_time_valid) \ + WARN_ON(ktime_to_ms(ktime_sub(now, \ + (_vq)->last_add_time)) > 100); \ + (_vq)->last_add_time = now; \ + (_vq)->last_add_time_valid = true; \ + } while (0) +#define LAST_ADD_TIME_CHECK(_vq) \ + do { \ + if ((_vq)->last_add_time_valid) { \ + WARN_ON(ktime_to_ms(ktime_sub(ktime_get(), \ + (_vq)->last_add_time)) > 100); \ + } \ + } while (0) +#define LAST_ADD_TIME_INVALID(_vq) \ + ((_vq)->last_add_time_valid = false) #else #define BAD_RING(_vq, fmt, args...) \ do { \ @@ -53,6 +73,9 @@ } while (0) #define START_USE(vq) #define END_USE(vq) +#define LAST_ADD_TIME_UPDATE(vq) +#define LAST_ADD_TIME_CHECK(vq) +#define LAST_ADD_TIME_INVALID(vq) #endif struct vring_desc_state { @@ -295,18 +318,7 @@ static inline int virtqueue_add_split(struct virtqueue *_vq, return -EIO; } -#ifdef DEBUG - { - ktime_t now = ktime_get(); - - /* No kick or get, with .1 second between? Warn. */ - if (vq->last_add_time_valid) - WARN_ON(ktime_to_ms(ktime_sub(now, vq->last_add_time)) - > 100); - vq->last_add_time = now; - vq->last_add_time_valid = true; - } -#endif + LAST_ADD_TIME_UPDATE(vq); BUG_ON(total_sg == 0); @@ -467,13 +479,8 @@ static bool virtqueue_kick_prepare_split(struct virtqueue *_vq) new = vq->split.avail_idx_shadow; vq->num_added = 0; -#ifdef DEBUG - if (vq->last_add_time_valid) { - WARN_ON(ktime_to_ms(ktime_sub(ktime_get(), - vq->last_add_time)) > 100); - } - vq->last_add_time_valid = false; -#endif + LAST_ADD_TIME_CHECK(vq); + LAST_ADD_TIME_INVALID(vq); if (vq->event) { needs_kick = vring_need_event(virtio16_to_cpu(_vq->vdev, @@ -597,9 +604,7 @@ static void *virtqueue_get_buf_ctx_split(struct virtqueue *_vq, &vring_used_event(&vq->split.vring), cpu_to_virtio16(_vq->vdev, vq->last_used_idx)); -#ifdef DEBUG - vq->last_add_time_valid = false; -#endif + LAST_ADD_TIME_INVALID(vq); END_USE(vq); return ret; |