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| author | Sascha Silbe <silbe@linux.vnet.ibm.com> | 2016-06-15 17:16:05 +0200 |
|---|---|---|
| committer | Cornelia Huck <cornelia.huck@de.ibm.com> | 2016-07-11 09:48:05 +0200 |
| commit | cf2499350aa4f2b6bdd30792cdf0b7f264fbcb36 (patch) | |
| tree | 6ec0ac8db8d6298389ad35af3cf354a40dc21c0d /include/hw/s390x | |
| parent | bb0995468a39f14077ceaa8ed5afdca849f00c7c (diff) | |
| download | qemu-cf2499350aa4f2b6bdd30792cdf0b7f264fbcb36.zip qemu-cf2499350aa4f2b6bdd30792cdf0b7f264fbcb36.tar.gz qemu-cf2499350aa4f2b6bdd30792cdf0b7f264fbcb36.tar.bz2 | |
s390x/css: factor out some generic code from virtio_ccw_device_realize()
A lot of what virtio_ccw_device_realize() does isn't specific to
virtio; it would apply to emulated CCW as well. Factor it out to make
it easier to implement emulated CCW devices later on.
Signed-off-by: Sascha Silbe <silbe@linux.vnet.ibm.com>
Reviewed-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Diffstat (limited to 'include/hw/s390x')
| -rw-r--r-- | include/hw/s390x/css.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/hw/s390x/css.h b/include/hw/s390x/css.h index 38f4d77..1da63e3 100644 --- a/include/hw/s390x/css.h +++ b/include/hw/s390x/css.h @@ -17,6 +17,7 @@ #include "hw/s390x/ioinst.h" /* Channel subsystem constants. */ +#define MAX_DEVNO 65535 #define MAX_SCHID 65535 #define MAX_SSID 3 #define MAX_CSSID 254 /* 255 is reserved */ @@ -24,6 +25,8 @@ #define MAX_CIWS 62 +#define VIRTUAL_CSSID 0xfe + typedef struct CIW { uint8_t type; uint8_t command; @@ -169,4 +172,19 @@ extern PropertyInfo css_devid_propinfo; #define DEFINE_PROP_CSS_DEV_ID(_n, _s, _f) \ DEFINE_PROP(_n, _s, _f, css_devid_propinfo, CssDevId) +/** + * Create a subchannel for the given bus id. + * + * If @p bus_id is valid, verify that it uses the virtual channel + * subsystem id and is not already in use, and find a free subchannel + * id for it. If @p bus_id is not valid, find a free subchannel id and + * device number across all subchannel sets. If either of the former + * actions succeed, allocate a subchannel structure, initialise it + * with the bus id, subchannel id and device number, register it with + * the CSS and return it. Otherwise return NULL. + * + * The caller becomes owner of the returned subchannel structure and + * is responsible for unregistering and freeing it. + */ +SubchDev *css_create_virtual_sch(CssDevId bus_id, Error **errp); #endif |