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s390/cio: Provide Endpoint-Security Mode per CU 

Add an interface in the CIO layer to retrieve the information about the
Endpoint-Security Mode (ESM) of the specified CU. The ESM values are
defined as 0-None, 1-Authenticated or 2, 3-Encrypted.

[vneethv@linux.ibm.com: cleaned-up and modified description]

Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Acked-by: Vasily Gorbik <gor@linux.ibm.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Vineeth Vijayan 2020-10-08 15:13:28 +02:00 committed by Jens Axboe
parent 8b8b0915ba
commit 4cd6094d9d
2 changed files with 84 additions and 0 deletions
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1
arch/s390/include/asm/cio.h
View File

@ -373,5 +373,6 @@ int chsc_sstpc(void *page, unsigned int op, u16 ctrl, u64 *clock_delta);
int chsc_sstpi(void *page, void *result, size_t size);
int chsc_stzi(void *page, void *result, size_t size);
int chsc_sgib(u32 origin);
int chsc_scud(u16 cu, u64 *esm, u8 *esm_valid);
#endif

83
drivers/s390/cio/chsc.c
View File

@ -1428,3 +1428,86 @@ int chsc_sgib(u32 origin)
return ret;
}
EXPORT_SYMBOL_GPL(chsc_sgib);
#define SCUD_REQ_LEN 0x10 /* SCUD request block length */
#define SCUD_REQ_CMD 0x4b /* SCUD Command Code */
struct chse_cudb {
u16 flags:8;
u16 chp_valid:8;
u16 cu;
u32 esm_valid:8;
u32:24;
u8 chpid[8];
u32:32;
u32:32;
u8 esm[8];
u32 efla[8];
} __packed;
struct chsc_scud {
struct chsc_header request;
u16:4;
u16 fmt:4;
u16 cssid:8;
u16 first_cu;
u16:16;
u16 last_cu;
u32:32;
struct chsc_header response;
u16:4;
u16 fmt_resp:4;
u32:24;
struct chse_cudb cudb[];
} __packed;
/**
* chsc_scud() - Store control-unit description.
* @cu: number of the control-unit
* @esm: 8 1-byte endpoint security mode values
* @esm_valid: validity mask for @esm
*
* Interface to retrieve information about the endpoint security
* modes for up to 8 paths of a control unit.
*
* Returns 0 on success.
*/
int chsc_scud(u16 cu, u64 *esm, u8 *esm_valid)
{
struct chsc_scud *scud = chsc_page;
int ret;
spin_lock_irq(&chsc_page_lock);
memset(chsc_page, 0, PAGE_SIZE);
scud->request.length = SCUD_REQ_LEN;
scud->request.code = SCUD_REQ_CMD;
scud->fmt = 0;
scud->cssid = 0;
scud->first_cu = cu;
scud->last_cu = cu;
ret = chsc(scud);
if (!ret)
ret = chsc_error_from_response(scud->response.code);
if (!ret && (scud->response.length <= 8 || scud->fmt_resp != 0
|| !(scud->cudb[0].flags & 0x80)
|| scud->cudb[0].cu != cu)) {
CIO_MSG_EVENT(2, "chsc: scud failed rc=%04x, L2=%04x "
"FMT=%04x, cudb.flags=%02x, cudb.cu=%04x",
scud->response.code, scud->response.length,
scud->fmt_resp, scud->cudb[0].flags, scud->cudb[0].cu);
ret = -EINVAL;
}
if (ret)
goto out;
memcpy(esm, scud->cudb[0].esm, sizeof(*esm));
*esm_valid = scud->cudb[0].esm_valid;
out:
spin_unlock_irq(&chsc_page_lock);
return ret;
}
EXPORT_SYMBOL_GPL(chsc_scud);