@@ -150,3 +150,67 @@ void vbus_driver_unregister(struct vbus_driver *drv)
}
EXPORT_SYMBOL_GPL(vbus_driver_unregister);
+/*
+ *---------------------------------
+ * driver-side IOQ helper
+ *---------------------------------
+ */
+static void
+vbus_driver_ioq_release(struct ioq *ioq)
+{
+ kfree(ioq->head_desc);
+ kfree(ioq);
+}
+
+static struct ioq_ops vbus_driver_ioq_ops = {
+ .release = vbus_driver_ioq_release,
+};
+
+
+int vbus_driver_ioq_alloc(struct vbus_device_proxy *dev, int id, int prio,
+ size_t count, struct ioq **ioq)
+{
+ struct ioq *_ioq;
+ struct ioq_ring_head *head = NULL;
+ struct shm_signal *signal = NULL;
+ size_t len = IOQ_HEAD_DESC_SIZE(count);
+ int ret = -ENOMEM;
+
+ _ioq = kzalloc(sizeof(*_ioq), GFP_KERNEL);
+ if (!_ioq)
+ goto error;
+
+ head = kzalloc(len, GFP_KERNEL | GFP_DMA);
+ if (!head)
+ goto error;
+
+ head->magic = IOQ_RING_MAGIC;
+ head->ver = IOQ_RING_VER;
+ head->count = count;
+
+ ret = dev->ops->shm(dev, id, prio, head, len,
+ &head->signal, &signal, 0);
+ if (ret < 0)
+ goto error;
+
+ ioq_init(_ioq,
+ &vbus_driver_ioq_ops,
+ ioq_locality_north,
+ head,
+ signal,
+ count);
+
+ *ioq = _ioq;
+
+ return 0;
+
+ error:
+ kfree(_ioq);
+ kfree(head);
+
+ if (signal)
+ shm_signal_put(signal);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vbus_driver_ioq_alloc);
@@ -26,6 +26,7 @@
#include <linux/device.h>
#include <linux/shm_signal.h>
+#include <linux/ioq.h>
struct vbus_device_proxy;
struct vbus_driver;
@@ -70,4 +71,10 @@ struct vbus_driver {
int vbus_driver_register(struct vbus_driver *drv);
void vbus_driver_unregister(struct vbus_driver *drv);
+/*
+ * driver-side IOQ helper - allocates device-shm and maps an IOQ on it
+ */
+int vbus_driver_ioq_alloc(struct vbus_device_proxy *dev, int id, int prio,
+ size_t ringsize, struct ioq **ioq);
+
#endif /* _LINUX_VBUS_DRIVER_H */
It will be a common pattern to map an IOQ over the VBUS shared-memory interfaces. Therefore, we provide a helper function to generalize the allocation and registration of an IOQ to make this use case simple and easy. Signed-off-by: Gregory Haskins <ghaskins@novell.com> --- drivers/vbus/bus-proxy.c | 64 +++++++++++++++++++++++++++++++++++++++++++ include/linux/vbus_driver.h | 7 +++++ 2 files changed, 71 insertions(+), 0 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html