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authorStephen Hemminger <stephen@networkplumber.org>2018-01-09 12:57:32 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-01-10 17:40:53 +0100
commitca3cda6fcf1e922213a0cc58e708ffb999151db3 (patch)
tree9c05b3efcc9058c9e26116711e034253996dea6b
parent06028d15177a1b406b7b075ea47c6a352732f23a (diff)
uio_hv_generic: add rescind support
When host rescinds the device, the UIO driver will clear the interrupt state and notify application. The read (or write) on the interrupt FD will then fail with -EIO. This is simpler than adding lots extra uevent stuff inside UIO. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--Documentation/driver-api/uio-howto.rst4
-rw-r--r--drivers/uio/uio_hv_generic.c19
2 files changed, 23 insertions, 0 deletions
diff --git a/Documentation/driver-api/uio-howto.rst b/Documentation/driver-api/uio-howto.rst
index 97e6435b3934..693e3bd84e79 100644
--- a/Documentation/driver-api/uio-howto.rst
+++ b/Documentation/driver-api/uio-howto.rst
@@ -698,6 +698,10 @@ prevents the device from generating further interrupts until the bit is
cleared. The userspace driver should clear this bit before blocking and
waiting for more interrupts.
+When host rescinds a device, the interrupt file descriptor is marked down
+and any reads of the interrupt file descriptor will return -EIO. Similar
+to a closed socket or disconnected serial device.
+
The vmbus device regions are mapped into uio device resources:
0) Channel ring buffers: guest to host and host to guest
1) Guest to host interrupt signalling pages
diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c
index ee6d862ef4bd..8c6b04a26c47 100644
--- a/drivers/uio/uio_hv_generic.c
+++ b/drivers/uio/uio_hv_generic.c
@@ -103,6 +103,23 @@ static void hv_uio_channel_cb(void *context)
uio_event_notify(&pdata->info);
}
+/*
+ * Callback from vmbus_event when channel is rescinded.
+ */
+static void hv_uio_rescind(struct vmbus_channel *channel)
+{
+ struct hv_device *hv_dev = channel->primary_channel->device_obj;
+ struct hv_uio_private_data *pdata = hv_get_drvdata(hv_dev);
+
+ /*
+ * Turn off the interrupt file handle
+ * Next read for event will return -EIO
+ */
+ pdata->info.irq = 0;
+
+ /* Wake up reader */
+ uio_event_notify(&pdata->info);
+}
static void
hv_uio_cleanup(struct hv_device *dev, struct hv_uio_private_data *pdata)
@@ -218,6 +235,8 @@ hv_uio_probe(struct hv_device *dev,
goto fail_close;
}
+ vmbus_set_chn_rescind_callback(dev->channel, hv_uio_rescind);
+
hv_set_drvdata(dev, pdata);
return 0;