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d95675349a
THIS_MODULE is used to differentiate modules on Linux. We currently completely stub out any Linux struct module usage, but THIS_MODULE is still used to populate the "owner" fields of various drivers. Even though we don't actually dereference these "owner" fields they are still used by drivers to check if devices/dmabufs/etc come from different modules. For example, during DRM GEM import some drivers check if the dmabuf's owner matches the dev's owner. If they match because they are both NULL drivers may incorrectly think two resources come from the same module. This adds a general purpose __this_linker_file which will point to the linker file of the module that uses it. We can then use that pointer to have a valid value for THIS_MODULE. Reviewed by: bz, jhb Differential Revision: https://reviews.freebsd.org/D44306 (cherry picked from commit 28a59100b54ff245a45fbd328266266f1c14eb8c)
128 lines
4.3 KiB
C
128 lines
4.3 KiB
C
/*-
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* Copyright (c) 2010 Isilon Systems, Inc.
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* Copyright (c) 2010 iX Systems, Inc.
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* Copyright (c) 2010 Panasas, Inc.
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* Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LINUXKPI_LINUX_MODULE_H_
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#define _LINUXKPI_LINUX_MODULE_H_
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/module.h>
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#include <sys/queue.h>
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#include <sys/linker.h>
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#include <linux/list.h>
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#include <linux/compiler.h>
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#include <linux/stringify.h>
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#include <linux/kmod.h>
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#include <linux/kobject.h>
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#include <linux/sysfs.h>
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#include <linux/moduleparam.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#define MODULE_AUTHOR(name)
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#define MODULE_DESCRIPTION(name)
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#define MODULE_LICENSE(name)
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#define MODULE_INFO(tag, info)
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#define MODULE_FIRMWARE(firmware)
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#define MODULE_SUPPORTED_DEVICE(name)
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#define MODULE_IMPORT_NS(_name)
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/*
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* THIS_MODULE is used to differentiate modules on Linux. We currently
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* completely stub out any Linux struct module usage, but THIS_MODULE is still
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* used to populate the "owner" fields of various drivers. Even though we
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* don't actually dereference these "owner" fields they are still used by
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* drivers to check if devices/dmabufs/etc come from different modules. For
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* example, during DRM GEM import some drivers check if the dmabuf's owner
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* matches the dev's owner. If they match because they are both NULL drivers
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* may incorrectly think two resources come from the same module.
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*
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* To handle this we specify an undefined symbol __this_linker_file, which
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* will get special treatment from the linker when resolving. This will
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* populate the usages of __this_linker_file with the linker_file_t of the
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* module.
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*/
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#ifdef KLD_MODULE
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#define THIS_MODULE ((struct module *)&__this_linker_file)
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#else
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#define THIS_MODULE ((struct module *)0)
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#endif
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#define __MODULE_STRING(x) __stringify(x)
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/* OFED pre-module initialization */
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#define SI_SUB_OFED_PREINIT (SI_SUB_ROOT_CONF - 2)
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/* OFED default module initialization */
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#define SI_SUB_OFED_MODINIT (SI_SUB_ROOT_CONF - 1)
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#include <sys/linker.h>
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static inline void
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_module_run(void *arg)
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{
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void (*fn)(void);
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#ifdef OFED_DEBUG_INIT
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char name[1024];
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caddr_t pc;
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long offset;
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pc = (caddr_t)arg;
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if (linker_search_symbol_name(pc, name, sizeof(name), &offset) != 0)
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printf("Running ??? (%p)\n", pc);
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else
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printf("Running %s (%p)\n", name, pc);
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#endif
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fn = arg;
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fn();
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}
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#define module_init(fn) \
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SYSINIT(fn, SI_SUB_OFED_MODINIT, SI_ORDER_FIRST, _module_run, (fn))
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#define module_exit(fn) \
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SYSUNINIT(fn, SI_SUB_OFED_MODINIT, SI_ORDER_SECOND, _module_run, (fn))
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/*
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* The following two macros are a workaround for not having a module
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* load and unload order resolver:
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*/
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#define module_init_order(fn, order) \
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SYSINIT(fn, SI_SUB_OFED_MODINIT, (order), _module_run, (fn))
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#define module_exit_order(fn, order) \
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SYSUNINIT(fn, SI_SUB_OFED_MODINIT, (order), _module_run, (fn))
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#define module_get(module)
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#define module_put(module)
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#define try_module_get(module) 1
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#define postcore_initcall(fn) module_init(fn)
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#endif /* _LINUXKPI_LINUX_MODULE_H_ */
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