Commit 10542ca0 authored by Ian Munsie's avatar Ian Munsie Committed by Michael Ellerman
Browse files

cxl: Add base builtin support 



This adds the base cxl support that cannot be built as a module. Specifically
it adds the cxl callbacks that are called from the core powerpc mm code which
must always exist irrespective of if the cxl module is loaded or not. This is
similar to how cell works with CONFIG_SPU_BASE.

This adds a cxl_slbia() call (similar to spu_flush_all_slbs()) which checks if
the cxl module is loaded and in use, returning immediately if it is not. If it
is in use it calls into the cxl SLB invalidation code.

Signed-off-by: default avatarIan Munsie <imunsie@au1.ibm.com>
Signed-off-by: default avatarMichael Neuling <mikey@neuling.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 4c6d9acc

drivers/misc/Kconfig

+1 −0
Original line number Original line Diff line number Diff line
@@ -527,4 +527,5 @@ source "drivers/misc/vmw_vmci/Kconfig" 
source "drivers/misc/mic/Kconfig"

source "drivers/misc/mic/Kconfig"

source "drivers/misc/genwqe/Kconfig"

source "drivers/misc/genwqe/Kconfig"

source "drivers/misc/echo/Kconfig"

source "drivers/misc/echo/Kconfig"

source "drivers/misc/cxl/Kconfig"

endmenu
 
endmenu

drivers/misc/Makefile

+1 −0
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@@ -55,3 +55,4 @@ obj-y += mic/ 
obj-$(CONFIG_GENWQE)		+= genwqe/

obj-$(CONFIG_GENWQE)		+= genwqe/

obj-$(CONFIG_ECHO)		+= echo/

obj-$(CONFIG_ECHO)		+= echo/

obj-$(CONFIG_VEXPRESS_SYSCFG)	+= vexpress-syscfg.o

obj-$(CONFIG_VEXPRESS_SYSCFG)	+= vexpress-syscfg.o

obj-$(CONFIG_CXL_BASE)		+= cxl/

drivers/misc/cxl/Kconfig

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+8 −0
Original line number Original line Diff line number Diff line 
#

# IBM Coherent Accelerator (CXL) compatible devices

#



config CXL_BASE

	bool

	default n

	select PPC_COPRO_BASE

drivers/misc/cxl/Makefile

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obj-$(CONFIG_CXL_BASE)		+= base.o

drivers/misc/cxl/base.c

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/*

 * Copyright 2014 IBM Corp.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version

 * 2 of the License, or (at your option) any later version.

 */



#include <linux/module.h>

#include <linux/rcupdate.h>

#include <asm/errno.h>

#include <misc/cxl.h>

#include "cxl.h"



/* protected by rcu */

static struct cxl_calls *cxl_calls;



atomic_t cxl_use_count = ATOMIC_INIT(0);

EXPORT_SYMBOL(cxl_use_count);



#ifdef CONFIG_CXL_MODULE



static inline struct cxl_calls *cxl_calls_get(void)

{

	struct cxl_calls *calls = NULL;



	rcu_read_lock();

	calls = rcu_dereference(cxl_calls);

	if (calls && !try_module_get(calls->owner))

		calls = NULL;

	rcu_read_unlock();



	return calls;

}



static inline void cxl_calls_put(struct cxl_calls *calls)

{

	BUG_ON(calls != cxl_calls);



	/* we don't need to rcu this, as we hold a reference to the module */

	module_put(cxl_calls->owner);

}



#else /* !defined CONFIG_CXL_MODULE */



static inline struct cxl_calls *cxl_calls_get(void)

{

	return cxl_calls;

}



static inline void cxl_calls_put(struct cxl_calls *calls) { }



#endif /* CONFIG_CXL_MODULE */



void cxl_slbia(struct mm_struct *mm)

{

	struct cxl_calls *calls;



	calls = cxl_calls_get();

	if (!calls)

		return;



	if (cxl_ctx_in_use())

	    calls->cxl_slbia(mm);



	cxl_calls_put(calls);

}



int register_cxl_calls(struct cxl_calls *calls)

{

	if (cxl_calls)

		return -EBUSY;



	rcu_assign_pointer(cxl_calls, calls);

	return 0;

}

EXPORT_SYMBOL_GPL(register_cxl_calls);



void unregister_cxl_calls(struct cxl_calls *calls)

{

	BUG_ON(cxl_calls->owner != calls->owner);

	RCU_INIT_POINTER(cxl_calls, NULL);

	synchronize_rcu();

}

EXPORT_SYMBOL_GPL(unregister_cxl_calls);

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