drivers/s390/cio/vfio_ccw_cp.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * channel program interfaces
   4  *
   5  * Copyright IBM Corp. 2017
   6  *
   7  * Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
   8  *            Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
   9  */
  10
  11 #ifndef _VFIO_CCW_CP_H_
  12 #define _VFIO_CCW_CP_H_
  13
  14 #include <asm/cio.h>
  15 #include <asm/scsw.h>
  16
  17 #include "orb.h"
  18 #include "vfio_ccw_trace.h"
  19
  20 /*
  21  * Max length for ccw chain.
  22  * XXX: Limit to 256, need to check more?
  23  */
  24 #define CCWCHAIN_LEN_MAX        256
  25
  26 /**
  27  * struct channel_program - manage information for channel program
  28  * @ccwchain_list: list head of ccwchains
  29  * @orb: orb for the currently processed ssch request
  30  * @initialized: whether this instance is actually initialized
  31  *
  32  * @ccwchain_list is the head of a ccwchain list, that contents the
  33  * translated result of the guest channel program that pointed out by
  34  * the iova parameter when calling cp_init.
  35  */
  36 struct channel_program {
  37         struct list_head ccwchain_list;
  38         union orb orb;
  39         bool initialized;
  40         struct ccw1 *guest_cp;
  41 };
  42
  43 int cp_init(struct channel_program *cp, union orb *orb);
  44 void cp_free(struct channel_program *cp);
  45 int cp_prefetch(struct channel_program *cp);
  46 union orb *cp_get_orb(struct channel_program *cp, struct subchannel *sch);
  47 void cp_update_scsw(struct channel_program *cp, union scsw *scsw);
  48 bool cp_iova_pinned(struct channel_program *cp, u64 iova, u64 length);
  49
  50 #endif