pc-bios/s390-ccw: add virtio-scsi implementation

Add virtio-scsi.[ch] with primary implementation of virtio-scsi.

Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>

1 files changed, 72 insertions, 0 deletions

diff --git a/pc-bios/s390-ccw/virtio-scsi.h b/pc-bios/s390-ccw/virtio-scsi.h
new file mode 100644
index 0000000000..f50b38b18b
--- /dev/null
+++ b/pc-bios/s390-ccw/virtio-scsi.h
@@ -0,0 +1,72 @@
+/*
+ * Virtio-SCSI definitions for s390 machine loader for qemu
+ *
+ * Copyright 2015 IBM Corp.
+ * Author: Eugene "jno" Dvurechenski <jno@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at
+ * your option) any later version. See the COPYING file in the top-level
+ * directory.
+ */
+
+#ifndef VIRTIO_SCSI_H
+#define VIRTIO_SCSI_H
+
+#include "s390-ccw.h"
+#include "virtio.h"
+#include "scsi.h"
+
+#define VIRTIO_SCSI_CDB_SIZE   SCSI_DEFAULT_CDB_SIZE
+#define VIRTIO_SCSI_SENSE_SIZE SCSI_DEFAULT_SENSE_SIZE
+
+/* command-specific response values */
+#define VIRTIO_SCSI_S_OK                     0x00
+#define VIRTIO_SCSI_S_BAD_TARGET             0x03
+
+#define QEMU_CDROM_SIGNATURE "QEMU CD-ROM     "
+
+enum virtio_scsi_vq_id {
+    VR_CONTROL  = 0,
+    VR_EVENT    = 1,
+    VR_REQUEST  = 2,
+};
+
+struct VirtioScsiCmdReq {
+    ScsiLun lun;
+    uint64_t id;
+    uint8_t task_attr;   /* = 0 = VIRTIO_SCSI_S_SIMPLE */
+    uint8_t prio;
+    uint8_t crn;         /* = 0 */
+    uint8_t cdb[VIRTIO_SCSI_CDB_SIZE];
+} __attribute__((packed));
+typedef struct VirtioScsiCmdReq VirtioScsiCmdReq;
+
+struct VirtioScsiCmdResp {
+        uint32_t sense_len;
+        uint32_t residual;
+        uint16_t status_qualifier;
+        uint8_t status;      /* first check for .response    */
+        uint8_t response;    /* then for .status             */
+        uint8_t sense[VIRTIO_SCSI_SENSE_SIZE];
+} __attribute__((packed));
+typedef struct VirtioScsiCmdResp VirtioScsiCmdResp;
+
+static inline const char *virtio_scsi_response_msg(const VirtioScsiCmdResp *r)
+{
+    static char err_msg[] = "VS RESP=XX";
+    uint8_t v = r->response;
+
+    fill_hex_val(err_msg + 8, &v, 1);
+    return err_msg;
+}
+
+static inline bool virtio_scsi_response_ok(const VirtioScsiCmdResp *r)
+{
+        return r->response == VIRTIO_SCSI_S_OK && r->status == CDB_STATUS_GOOD;
+}
+
+void virtio_scsi_setup(VDev *vdev);
+int virtio_scsi_read_many(VDev *vdev,
+                          ulong sector, void *load_addr, int sec_num);
+
+#endif /* VIRTIO_SCSI_H */