Commit 35758b00 authored by Alexandra Winter's avatar Alexandra Winter Committed by Paolo Abeni
Browse files

dibs: Create drivers/dibs 



Create the file structure for a 'DIBS - Direct Internal Buffer Sharing'
shim layer that will provide generic functionality and declarations for
dibs device drivers and dibs clients.

Following patches will add functionality.

Signed-off-by: default avatarAlexandra Winter <wintera@linux.ibm.com>
Link: https://patch.msgid.link/20250918110500.1731261-4-wintera@linux.ibm.com


Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
parent a4997e17

MAINTAINERS

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@@ -7132,6 +7132,13 @@ L: linux-gpio@vger.kernel.org 
S:	Maintained

F:	drivers/gpio/gpio-gpio-mm.c









DIBS (DIRECT INTERNAL BUFFER SHARING)









M:	Alexandra Winter <wintera@linux.ibm.com>









L:	netdev@vger.kernel.org









S:	Supported









F:	drivers/dibs/









F:	include/linux/dibs.h

















DIGITEQ AUTOMOTIVE MGB4 V4L2 DRIVER









M:	Martin Tuma <martin.tuma@digiteqautomotive.com>









L:	linux-media@vger.kernel.org
































drivers/Makefile



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@@ -195,4 +195,5 @@ obj-$(CONFIG_DRM_ACCEL)		+= accel/







obj-$(CONFIG_CDX_BUS)		+= cdx/









obj-$(CONFIG_DPLL)		+= dpll/



















obj-$(CONFIG_DIBS)		+= dibs/









obj-$(CONFIG_S390)		+= s390/
























drivers/dibs/Kconfig
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# SPDX-License-Identifier: GPL-2.0









config DIBS









	tristate "DIBS support"









	default n









	help









	  Direct Internal Buffer Sharing (DIBS)









	  A communication method that uses common physical (internal) memory









	  for synchronous direct access into a remote buffer.



















	  Select this option to provide the abstraction layer between









	  dibs devices and dibs clients like the SMC protocol.









	  The module name is dibs.
























drivers/dibs/Makefile
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# SPDX-License-Identifier: GPL-2.0









#









# DIBS class module









#



















dibs-y += dibs_main.o









obj-$(CONFIG_DIBS) += dibs.o
























drivers/dibs/dibs_main.c
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// SPDX-License-Identifier: GPL-2.0









/*









 *  DIBS - Direct Internal Buffer Sharing









 *









 *  Implementation of the DIBS class module









 *









 *  Copyright IBM Corp. 2025









 */









#define KMSG_COMPONENT "dibs"









#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt



















#include <linux/module.h>









#include <linux/types.h>









#include <linux/err.h>









#include <linux/dibs.h>



















MODULE_DESCRIPTION("Direct Internal Buffer Sharing class");









MODULE_LICENSE("GPL");



















/* use an array rather a list for fast mapping: */









static struct dibs_client *clients[MAX_DIBS_CLIENTS];









static u8 max_client;



















static int __init dibs_init(void)









{









	memset(clients, 0, sizeof(clients));









	max_client = 0;



















	return 0;









}



















static void __exit dibs_exit(void)









{









}



















module_init(dibs_init);









module_exit(dibs_exit);