Simply redirect everything via the byte-at-a-time accessor. Slow, but simple
and this is config reading, which mostly only happens at probe time.
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
---
drivers/virtio/virtio.c | 69 +++++++++++++++++++++++++++++++++++++++++
include/linux/virtio_config.h | 19 ++++++++++++
2 files changed, 88 insertions(+)
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index ee59b74..2b154f3 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -219,6 +219,75 @@ out:
}
EXPORT_SYMBOL_GPL(register_virtio_device);
+static void noconv_get(struct virtio_device *vdev, unsigned offset,
+ size_t len, void *p)
+{
+ u8 *buf = p;
+ while (len) {
+ *buf = vdev->config->get8(vdev, offset);
+ buf++;
+ offset++;
+ len--;
+ }
+}
+
+u16 virtio_config_get_noconv16(struct virtio_device *vdev, unsigned offset)
+{
+ u16 v;
+ noconv_get(vdev, offset, sizeof(v), &v);
+ return v;
+}
+EXPORT_SYMBOL_GPL(virtio_config_get_noconv16);
+
+u32 virtio_config_get_noconv32(struct virtio_device *vdev, unsigned offset)
+{
+ u32 v;
+ noconv_get(vdev, offset, sizeof(v), &v);
+ return v;
+}
+EXPORT_SYMBOL_GPL(virtio_config_get_noconv32);
+
+u64 virtio_config_get_noconv64(struct virtio_device *vdev, unsigned offset)
+{
+ u64 v;
+ noconv_get(vdev, offset, sizeof(v), &v);
+ return v;
+}
+EXPORT_SYMBOL_GPL(virtio_config_get_noconv64);
+
+static void noconv_set(struct virtio_device *vdev, unsigned offset,
+ size_t len, const void *p)
+{
+ const u8 *buf = p;
+ while (len) {
+ vdev->config->set8(vdev, offset, *buf);
+ buf++;
+ offset++;
+ len--;
+ }
+}
+
+void virtio_config_set_noconv16(struct virtio_device *vdev,
+ unsigned offset, u16 v)
+{
+ noconv_set(vdev, offset, sizeof(v), &v);
+}
+EXPORT_SYMBOL_GPL(virtio_config_set_noconv16);
+
+void virtio_config_set_noconv32(struct virtio_device *vdev,
+ unsigned offset, u32 v)
+{
+ noconv_set(vdev, offset, sizeof(v), &v);
+}
+EXPORT_SYMBOL_GPL(virtio_config_set_noconv32);
+
+void virtio_config_set_noconv64(struct virtio_device *vdev,
+ unsigned offset, u64 v)
+{
+ noconv_set(vdev, offset, sizeof(v), &v);
+}
+EXPORT_SYMBOL_GPL(virtio_config_set_noconv64);
+
void unregister_virtio_device(struct virtio_device *dev)
{
int index = dev->index; /* save for after device release */
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index e8f8f71..12a777f 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -270,4 +270,23 @@ static inline void virtio_cwrite64(struct virtio_device *vdev,
_r; \
})
+/* Helpers for non-endian converting transports. */
+u16 virtio_config_get_noconv16(struct virtio_device *vdev, unsigned offset);
+u32 virtio_config_get_noconv32(struct virtio_device *vdev, unsigned offset);
+u64 virtio_config_get_noconv64(struct virtio_device *vdev, unsigned offset);
+void virtio_config_set_noconv16(struct virtio_device *vdev,
+ unsigned offset, u16 v);
+void virtio_config_set_noconv32(struct virtio_device *vdev,
+ unsigned offset, u32 v);
+void virtio_config_set_noconv64(struct virtio_device *vdev,
+ unsigned offset, u64 v);
+
+#define VIRTIO_CONFIG_OPS_NOCONV \
+ .get16 = virtio_config_get_noconv16, \
+ .set16 = virtio_config_set_noconv16, \
+ .get32 = virtio_config_get_noconv32, \
+ .set32 = virtio_config_set_noconv32, \
+ .get64 = virtio_config_get_noconv64, \
+ .set64 = virtio_config_set_noconv64
+
#endif /* _LINUX_VIRTIO_CONFIG_H */
--
1.7.10.4
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