Add qemu 2.4.0

[kvmfornfv.git] / qemu / hw / block / xen_blkif.h

diff --git a/qemu/hw/block/xen_blkif.h b/qemu/hw/block/xen_blkif.h
new file mode 100644 (file)
index 0000000..711b692
--- /dev/null
+++ b/qemu/hw/block/xen_blkif.h
@@ -0,0 +1,115 @@
+#ifndef __XEN_BLKIF_H__
+#define __XEN_BLKIF_H__
+
+#include <xen/io/ring.h>
+#include <xen/io/blkif.h>
+#include <xen/io/protocols.h>
+
+/* Not a real protocol.  Used to generate ring structs which contain
+ * the elements common to all protocols only.  This way we get a
+ * compiler-checkable way to use common struct elements, so we can
+ * avoid using switch(protocol) in a number of places.  */
+struct blkif_common_request {
+       char dummy;
+};
+struct blkif_common_response {
+       char dummy;
+};
+
+/* i386 protocol version */
+#pragma pack(push, 4)
+struct blkif_x86_32_request {
+       uint8_t        operation;    /* BLKIF_OP_???                         */
+       uint8_t        nr_segments;  /* number of segments                   */
+       blkif_vdev_t   handle;       /* only for read/write requests         */
+       uint64_t       id;           /* private guest value, echoed in resp  */
+       blkif_sector_t sector_number;/* start sector idx on disk (r/w only)  */
+       struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
+};
+struct blkif_x86_32_response {
+       uint64_t        id;              /* copied from request */
+       uint8_t         operation;       /* copied from request */
+       int16_t         status;          /* BLKIF_RSP_???       */
+};
+typedef struct blkif_x86_32_request blkif_x86_32_request_t;
+typedef struct blkif_x86_32_response blkif_x86_32_response_t;
+#pragma pack(pop)
+
+/* x86_64 protocol version */
+struct blkif_x86_64_request {
+       uint8_t        operation;    /* BLKIF_OP_???                         */
+       uint8_t        nr_segments;  /* number of segments                   */
+       blkif_vdev_t   handle;       /* only for read/write requests         */
+       uint64_t       __attribute__((__aligned__(8))) id;
+       blkif_sector_t sector_number;/* start sector idx on disk (r/w only)  */
+       struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
+};
+struct blkif_x86_64_response {
+       uint64_t       __attribute__((__aligned__(8))) id;
+       uint8_t         operation;       /* copied from request */
+       int16_t         status;          /* BLKIF_RSP_???       */
+};
+typedef struct blkif_x86_64_request blkif_x86_64_request_t;
+typedef struct blkif_x86_64_response blkif_x86_64_response_t;
+
+DEFINE_RING_TYPES(blkif_common, struct blkif_common_request, struct blkif_common_response);
+DEFINE_RING_TYPES(blkif_x86_32, struct blkif_x86_32_request, struct blkif_x86_32_response);
+DEFINE_RING_TYPES(blkif_x86_64, struct blkif_x86_64_request, struct blkif_x86_64_response);
+
+union blkif_back_rings {
+       blkif_back_ring_t        native;
+       blkif_common_back_ring_t common;
+        blkif_x86_32_back_ring_t x86_32_part;
+        blkif_x86_64_back_ring_t x86_64_part;
+};
+typedef union blkif_back_rings blkif_back_rings_t;
+
+enum blkif_protocol {
+       BLKIF_PROTOCOL_NATIVE = 1,
+       BLKIF_PROTOCOL_X86_32 = 2,
+       BLKIF_PROTOCOL_X86_64 = 3,
+};
+
+static inline void blkif_get_x86_32_req(blkif_request_t *dst, blkif_x86_32_request_t *src)
+{
+       int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;
+
+       dst->operation = src->operation;
+       dst->nr_segments = src->nr_segments;
+       dst->handle = src->handle;
+       dst->id = src->id;
+       dst->sector_number = src->sector_number;
+       if (src->operation == BLKIF_OP_DISCARD) {
+               struct blkif_request_discard *s = (void *)src;
+               struct blkif_request_discard *d = (void *)dst;
+               d->nr_sectors = s->nr_sectors;
+               return;
+       }
+       if (n > src->nr_segments)
+               n = src->nr_segments;
+       for (i = 0; i < n; i++)
+               dst->seg[i] = src->seg[i];
+}
+
+static inline void blkif_get_x86_64_req(blkif_request_t *dst, blkif_x86_64_request_t *src)
+{
+       int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;
+
+       dst->operation = src->operation;
+       dst->nr_segments = src->nr_segments;
+       dst->handle = src->handle;
+       dst->id = src->id;
+       dst->sector_number = src->sector_number;
+       if (src->operation == BLKIF_OP_DISCARD) {
+               struct blkif_request_discard *s = (void *)src;
+               struct blkif_request_discard *d = (void *)dst;
+               d->nr_sectors = s->nr_sectors;
+               return;
+       }
+       if (n > src->nr_segments)
+               n = src->nr_segments;
+       for (i = 0; i < n; i++)
+               dst->seg[i] = src->seg[i];
+}
+
+#endif /* __XEN_BLKIF_H__ */