Commit 4cd6094d authored by Vineeth Vijayan's avatar Vineeth Vijayan Committed by Jens Axboe
Browse files

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: default avatarSebastian Ott <sebott@linux.ibm.com>
Signed-off-by: default avatarVineeth Vijayan <vneethv@linux.ibm.com>
Signed-off-by: default avatarStefan Haberland <sth@linux.ibm.com>
Reviewed-by: default avatarPeter Oberparleiter <oberpar@linux.ibm.com>
Acked-by: default avatarVasily Gorbik <gor@linux.ibm.com>
Acked-by: default avatarCornelia Huck <cohuck@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 8b8b0915

arch/s390/include/asm/cio.h

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/s390/cio/chsc.c

+83 −0
Original line number Diff line number Diff line
@@ -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);