arch/s390/include/asm/chpid.h

   1 /*
   2  *  drivers/s390/cio/chpid.h
   3  *
   4  *    Copyright IBM Corp. 2007
   5  *    Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
   6  */
   7
   8 #ifndef _ASM_S390_CHPID_H
   9 #define _ASM_S390_CHPID_H _ASM_S390_CHPID_H
  10
  11 #include <linux/string.h>
  12 #include <linux/types.h>
  13
  14 #define __MAX_CHPID 255
  15
  16 struct chp_id {
  17         u8 reserved1;
  18         u8 cssid;
  19         u8 reserved2;
  20         u8 id;
  21 } __attribute__((packed));
  22
  23 #ifdef __KERNEL__
  24 #include <asm/cio.h>
  25
  26 static inline void chp_id_init(struct chp_id *chpid)
  27 {
  28         memset(chpid, 0, sizeof(struct chp_id));
  29 }
  30
  31 static inline int chp_id_is_equal(struct chp_id *a, struct chp_id *b)
  32 {
  33         return (a->id == b->id) && (a->cssid == b->cssid);
  34 }
  35
  36 static inline void chp_id_next(struct chp_id *chpid)
  37 {
  38         if (chpid->id < __MAX_CHPID)
  39                 chpid->id++;
  40         else {
  41                 chpid->id = 0;
  42                 chpid->cssid++;
  43         }
  44 }
  45
  46 static inline int chp_id_is_valid(struct chp_id *chpid)
  47 {
  48         return (chpid->cssid <= __MAX_CSSID);
  49 }
  50
  51
  52 #define chp_id_for_each(c) \
  53         for (chp_id_init(c); chp_id_is_valid(c); chp_id_next(c))
  54 #endif /* __KERNEL */
  55
  56 #endif /* _ASM_S390_CHPID_H */