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s390/ism: Introduce struct ism_dmb

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Conceptually, a DMB is a structure that belongs to ISM devices. However,
SMC currently 'owns' this structure. So future exploiters of ISM devices
would be forced to include SMC headers to work - which is just weird.
Therefore, we switch ISM to struct ism_dmb, introduce a new public header
with the definition (will be populated with further API calls later on),
and, add a thin wrapper to please SMC. Since structs smcd_dmb and ism_dmb
are identical, we can simply convert between the two for now.

Signed-off-by: Stefan Raspl <raspl@linux.ibm.com>
Signed-off-by: Jan Karcher <jaka@linux.ibm.com>
Signed-off-by: Wenjia Zhang <wenjia@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefan Raspl
2023-01-23 19:17:47 +01:00
committed by David S. Miller
parent 462502ff9a
commit 1baedb13f1
3 changed files with 40 additions and 6 deletions
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23
include/linux/ism.h Normal file
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@@ -0,0 +1,23 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Internal Shared Memory
*
* Definitions for the ISM module
*
* Copyright IBM Corp. 2022
*/
#ifndef _ISM_H
#define _ISM_H
struct ism_dmb {
u64 dmb_tok;
u64 rgid;
u32 dmb_len;
u32 sba_idx;
u32 vlan_valid;
u32 vlan_id;
void *cpu_addr;
dma_addr_t dma_addr;
};
#endif /* _ISM_H */