ec249dd860
This moves the current include file from cxl.h -> cxl-base.h. This current include file is used only to pass information between the base driver that needs to be built into the kernel and the cxl module. This is to make way for a new include/misc/cxl.h which will contain just the kernel API for other driver to use Signed-off-by: Michael Neuling <mikey@neuling.org> Acked-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
87 lines
1.7 KiB
C
87 lines
1.7 KiB
C
/*
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* Copyright 2014 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/rcupdate.h>
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#include <asm/errno.h>
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#include <misc/cxl-base.h>
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#include "cxl.h"
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/* protected by rcu */
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static struct cxl_calls *cxl_calls;
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atomic_t cxl_use_count = ATOMIC_INIT(0);
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EXPORT_SYMBOL(cxl_use_count);
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#ifdef CONFIG_CXL_MODULE
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static inline struct cxl_calls *cxl_calls_get(void)
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{
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struct cxl_calls *calls = NULL;
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rcu_read_lock();
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calls = rcu_dereference(cxl_calls);
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if (calls && !try_module_get(calls->owner))
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calls = NULL;
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rcu_read_unlock();
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return calls;
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}
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static inline void cxl_calls_put(struct cxl_calls *calls)
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{
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BUG_ON(calls != cxl_calls);
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/* we don't need to rcu this, as we hold a reference to the module */
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module_put(cxl_calls->owner);
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}
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#else /* !defined CONFIG_CXL_MODULE */
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static inline struct cxl_calls *cxl_calls_get(void)
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{
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return cxl_calls;
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}
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static inline void cxl_calls_put(struct cxl_calls *calls) { }
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#endif /* CONFIG_CXL_MODULE */
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void cxl_slbia(struct mm_struct *mm)
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{
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struct cxl_calls *calls;
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calls = cxl_calls_get();
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if (!calls)
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return;
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if (cxl_ctx_in_use())
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calls->cxl_slbia(mm);
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cxl_calls_put(calls);
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}
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int register_cxl_calls(struct cxl_calls *calls)
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{
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if (cxl_calls)
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return -EBUSY;
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rcu_assign_pointer(cxl_calls, calls);
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return 0;
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}
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EXPORT_SYMBOL_GPL(register_cxl_calls);
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void unregister_cxl_calls(struct cxl_calls *calls)
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{
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BUG_ON(cxl_calls->owner != calls->owner);
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RCU_INIT_POINTER(cxl_calls, NULL);
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synchronize_rcu();
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}
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EXPORT_SYMBOL_GPL(unregister_cxl_calls);
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