[Qemu-devel] [PATCH v2 04/17] virtio: use standard-headers

[Michael S. Tsirkin]

Drop a bunch of code duplicated from virtio_config.h and virtio_ring.h.
This makes us rename event index accessors which conflict,
as reusing the ones from virtio_ring.h isn't trivial.

Signed-off-by: Michael S. Tsirkin <address@hidden>
---
 hw/9pfs/virtio-9p.h        |  1 +
 include/hw/virtio/virtio.h | 48 ++--------------------------------------------
 hw/virtio/virtio.c         | 23 +++++-----------------
 3 files changed, 8 insertions(+), 64 deletions(-)

diff --git a/hw/9pfs/virtio-9p.h b/hw/9pfs/virtio-9p.h
index 2c3603a..0776424 100644
--- a/hw/9pfs/virtio-9p.h
+++ b/hw/9pfs/virtio-9p.h
@@ -8,6 +8,7 @@
 #include <sys/resource.h>
 #include <glib.h>
 #include "hw/virtio/virtio.h"
+#include "hw/virtio/virtio-9p.h"
 #include "fsdev/file-op-9p.h"
 #include "fsdev/virtio-9p-marshal.h"
 #include "qemu/thread.h"
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index f24997d..88a9bc1 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -19,56 +19,12 @@
 #include "hw/qdev.h"
 #include "sysemu/sysemu.h"
 #include "qemu/event_notifier.h"
-#ifdef CONFIG_VIRTFS
-#include "hw/virtio/virtio-9p.h"
-#endif
+#include "standard-headers/sys/virtio_config.h"
+#include "standard-headers/sys/virtio_ring.h"
 
-/* from Linux's linux/virtio_config.h */
-
-/* Status byte for guest to report progress, and synchronize features. */
-/* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
-#define VIRTIO_CONFIG_S_ACKNOWLEDGE     1
-/* We have found a driver for the device. */
-#define VIRTIO_CONFIG_S_DRIVER          2
-/* Driver has used its parts of the config, and is happy */
-#define VIRTIO_CONFIG_S_DRIVER_OK       4
-/* We've given up on this device. */
-#define VIRTIO_CONFIG_S_FAILED          0x80
-
-/* Some virtio feature bits (currently bits 28 through 31) are reserved for the
- * transport being used (eg. virtio_ring), the rest are per-device feature 
bits. */
-#define VIRTIO_TRANSPORT_F_START        28
-#define VIRTIO_TRANSPORT_F_END          32
-
-/* We notify when the ring is completely used, even if the guest is suppressing
- * callbacks */
-#define VIRTIO_F_NOTIFY_ON_EMPTY        24
-/* Can the device handle any descriptor layout? */
-#define VIRTIO_F_ANY_LAYOUT             27
-/* We support indirect buffer descriptors */
-#define VIRTIO_RING_F_INDIRECT_DESC     28
-/* The Guest publishes the used index for which it expects an interrupt
- * at the end of the avail ring. Host should ignore the avail->flags field. */
-/* The Host publishes the avail index for which it expects a kick
- * at the end of the used ring. Guest should ignore the used->flags field. */
-#define VIRTIO_RING_F_EVENT_IDX         29
 /* A guest should never accept this.  It implies negotiation is broken. */
 #define VIRTIO_F_BAD_FEATURE           30
 
-/* from Linux's linux/virtio_ring.h */
-
-/* This marks a buffer as continuing via the next field. */
-#define VRING_DESC_F_NEXT       1
-/* This marks a buffer as write-only (otherwise read-only). */
-#define VRING_DESC_F_WRITE      2
-/* This means the buffer contains a list of buffer descriptors. */
-#define VRING_DESC_F_INDIRECT  4
-
-/* This means don't notify other side when buffer added. */
-#define VRING_USED_F_NO_NOTIFY  1
-/* This means don't interrupt guest when buffer consumed. */
-#define VRING_AVAIL_F_NO_INTERRUPT      1
-
 struct VirtQueue;
 
 static inline hwaddr vring_align(hwaddr addr,
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index d735343..f783f31 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -155,7 +155,7 @@ static inline uint16_t vring_avail_ring(VirtQueue *vq, int 
i)
     return virtio_lduw_phys(vq->vdev, pa);
 }
 
-static inline uint16_t vring_used_event(VirtQueue *vq)
+static inline uint16_t vring_get_used_event(VirtQueue *vq)
 {
     return vring_avail_ring(vq, vq->vring.num);
 }
@@ -204,7 +204,7 @@ static inline void vring_used_flags_unset_bit(VirtQueue 
*vq, int mask)
     virtio_stw_phys(vdev, pa, virtio_lduw_phys(vdev, pa) & ~mask);
 }
 
-static inline void vring_avail_event(VirtQueue *vq, uint16_t val)
+static inline void vring_set_avail_event(VirtQueue *vq, uint16_t val)
 {
     hwaddr pa;
     if (!vq->notification) {
@@ -218,7 +218,7 @@ void virtio_queue_set_notification(VirtQueue *vq, int 
enable)
 {
     vq->notification = enable;
     if (vq->vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX)) {
-        vring_avail_event(vq, vring_avail_idx(vq));
+        vring_set_avail_event(vq, vring_avail_idx(vq));
     } else if (enable) {
         vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY);
     } else {
@@ -469,7 +469,7 @@ int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem)
 
     i = head = virtqueue_get_head(vq, vq->last_avail_idx++);
     if (vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX)) {
-        vring_avail_event(vq, vq->last_avail_idx);
+        vring_set_avail_event(vq, vq->last_avail_idx);
     }
 
     if (vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_INDIRECT) {
@@ -819,19 +819,6 @@ void virtio_irq(VirtQueue *vq)
     virtio_notify_vector(vq->vdev, vq->vector);
 }
 
-/* Assuming a given event_idx value from the other size, if
- * we have just incremented index from old to new_idx,
- * should we trigger an event? */
-static inline int vring_need_event(uint16_t event, uint16_t new, uint16_t old)
-{
-       /* Note: Xen has similar logic for notification hold-off
-        * in include/xen/interface/io/ring.h with req_event and req_prod
-        * corresponding to event_idx + 1 and new respectively.
-        * Note also that req_event and req_prod in Xen start at 1,
-        * event indexes in virtio start at 0. */
-       return (uint16_t)(new - event - 1) < (uint16_t)(new - old);
-}
-
 static bool vring_notify(VirtIODevice *vdev, VirtQueue *vq)
 {
     uint16_t old, new;
@@ -852,7 +839,7 @@ static bool vring_notify(VirtIODevice *vdev, VirtQueue *vq)
     vq->signalled_used_valid = true;
     old = vq->signalled_used;
     new = vq->signalled_used = vring_used_idx(vq);
-    return !v || vring_need_event(vring_used_event(vq), new, old);
+    return !v || vring_need_event(vring_get_used_event(vq), new, old);
 }
 
 void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
-- 
MST