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| author | Jing Liu | 2016-09-19 09:10:43 +0200 |
|---|---|---|
| committer | Cornelia Huck | 2017-05-04 10:34:37 +0200 |
| commit | 6c15e9bfb687f40cc92759536ef2a918fb04349b (patch) | |
| tree | d64cdf7abcede90f1a5709122e0886400a9c85ed /include/hw/s390x/css.h | |
| parent | chardev: Basic support for TN3270 (diff) | |
| download | qemu-6c15e9bfb687f40cc92759536ef2a918fb04349b.tar.gz qemu-6c15e9bfb687f40cc92759536ef2a918fb04349b.tar.xz qemu-6c15e9bfb687f40cc92759536ef2a918fb04349b.zip | |
s390x/css: Add an algorithm to find a free chpid
This introduces a function named css_find_free_chpid() to find a
free channel path. Because virtio-ccw device used zero as its
channel path number, it would be sensible to skip the reserved one
and search upwards.
Signed-off-by: Jing Liu <liujbjl@linux.vnet.ibm.com>
Reviewed-by: QingFeng Hao <haoqf@linux.vnet.ibm.com>
Reviewed-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Diffstat (limited to 'include/hw/s390x/css.h')
| -rw-r--r-- | include/hw/s390x/css.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/hw/s390x/css.h b/include/hw/s390x/css.h index f1f0d7f07a..e61fa74d9b 100644 --- a/include/hw/s390x/css.h +++ b/include/hw/s390x/css.h @@ -28,6 +28,7 @@ #define MAX_CIWS 62 #define VIRTUAL_CSSID 0xfe +#define VIRTIO_CCW_CHPID 0 /* used by convention */ typedef struct CIW { uint8_t type; @@ -115,6 +116,7 @@ bool css_devno_used(uint8_t cssid, uint8_t ssid, uint16_t devno); void css_subch_assign(uint8_t cssid, uint8_t ssid, uint16_t schid, uint16_t devno, SubchDev *sch); void css_sch_build_virtual_schib(SubchDev *sch, uint8_t chpid, uint8_t type); +unsigned int css_find_free_chpid(uint8_t cssid); uint16_t css_build_subchannel_id(SubchDev *sch); void css_reset(void); void css_reset_sch(SubchDev *sch); |