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s390/cio: use cssid for pgid generation

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Obtain the real channel subsystem id and use that for the generation
of a unique path group id. Note that this change does not affect the
channel subsystem id as used in the user-visible naming of subchannels
and friends.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Dong Jia Shi <bjsdjshik@linux.vnet.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott
2016-06-17 19:45:23 +02:00
committed by Martin Schwidefsky
parent 98cc43ab6b
commit e2e0de9b57
4 changed files with 53 additions and 3 deletions
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46
drivers/s390/cio/chsc.c
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@@ -1131,6 +1131,52 @@ int chsc_enable_facility(int operation_code)
return ret;
}
int __init chsc_get_cssid(int idx)
{
struct {
struct chsc_header request;
u8 atype;
u32 : 24;
u32 reserved1[6];
struct chsc_header response;
u32 reserved2[3];
struct {
u8 cssid;
u32 : 24;
} list[0];
} __packed *sdcal_area;
int ret;
spin_lock_irq(&chsc_page_lock);
memset(chsc_page, 0, PAGE_SIZE);
sdcal_area = chsc_page;
sdcal_area->request.length = 0x0020;
sdcal_area->request.code = 0x0034;
sdcal_area->atype = 4;
ret = chsc(sdcal_area);
if (ret) {
ret = (ret == 3) ? -ENODEV : -EBUSY;
goto exit;
}
ret = chsc_error_from_response(sdcal_area->response.code);
if (ret) {
CIO_CRW_EVENT(2, "chsc: sdcal failed (rc=%04x)\n",
sdcal_area->response.code);
goto exit;
}
if ((addr_t) &sdcal_area->list[idx] <
(addr_t) &sdcal_area->response + sdcal_area->response.length)
ret = sdcal_area->list[idx].cssid;
else
ret = -ENODEV;
exit:
spin_unlock_irq(&chsc_page_lock);
return ret;
}
struct css_general_char css_general_characteristics;
struct css_chsc_char css_chsc_characteristics;