[linux-2.6-block.git] / drivers / iommu / io-pgtable.c

/*
 * Generic page table allocator for IOMMUs.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Copyright (C) 2014 ARM Limited
 *
 * Author: Will Deacon <will.deacon@arm.com>
 */

#include <linux/bug.h>
#include <linux/io-pgtable.h>
#include <linux/kernel.h>
#include <linux/types.h>

static const struct io_pgtable_init_fns *
io_pgtable_init_table[IO_PGTABLE_NUM_FMTS] = {
#ifdef CONFIG_IOMMU_IO_PGTABLE_LPAE
	[ARM_32_LPAE_S1] = &io_pgtable_arm_32_lpae_s1_init_fns,
	[ARM_32_LPAE_S2] = &io_pgtable_arm_32_lpae_s2_init_fns,
	[ARM_64_LPAE_S1] = &io_pgtable_arm_64_lpae_s1_init_fns,
	[ARM_64_LPAE_S2] = &io_pgtable_arm_64_lpae_s2_init_fns,
#endif
#ifdef CONFIG_IOMMU_IO_PGTABLE_ARMV7S
	[ARM_V7S] = &io_pgtable_arm_v7s_init_fns,
#endif
};

struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt,
					    struct io_pgtable_cfg *cfg,
					    void *cookie)
{
	struct io_pgtable *iop;
	const struct io_pgtable_init_fns *fns;

	if (fmt >= IO_PGTABLE_NUM_FMTS)
		return NULL;

	fns = io_pgtable_init_table[fmt];
	if (!fns)
		return NULL;

	iop = fns->alloc(cfg, cookie);
	if (!iop)
		return NULL;

	iop->fmt	= fmt;
	iop->cookie	= cookie;
	iop->cfg	= *cfg;

	return &iop->ops;
}
EXPORT_SYMBOL_GPL(alloc_io_pgtable_ops);

/*
 * It is the IOMMU driver's responsibility to ensure that the page table
 * is no longer accessible to the walker by this point.
 */
void free_io_pgtable_ops(struct io_pgtable_ops *ops)
{
	struct io_pgtable *iop;

	if (!ops)
		return;

	iop = container_of(ops, struct io_pgtable, ops);
	io_pgtable_tlb_flush_all(iop);
	io_pgtable_init_table[iop->fmt]->free(iop);
}
EXPORT_SYMBOL_GPL(free_io_pgtable_ops);
Commit	Line	Data
fdb1d7be WD	1	/*
	2	* Generic page table allocator for IOMMUs.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License
	14	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	15	*
	16	* Copyright (C) 2014 ARM Limited
	17	*
	18	* Author: Will Deacon <will.deacon@arm.com>
	19	*/
	20
	21	#include <linux/bug.h>
b77cf11f	22	#include <linux/io-pgtable.h>
fdb1d7be WD	23	#include <linux/kernel.h>
	24	#include <linux/types.h>
	25
fdb1d7be	26	static const struct io_pgtable_init_fns *
54c6d242	27	io_pgtable_init_table[IO_PGTABLE_NUM_FMTS] = {
e1d3c0fd WD	28	#ifdef CONFIG_IOMMU_IO_PGTABLE_LPAE
	29	[ARM_32_LPAE_S1] = &io_pgtable_arm_32_lpae_s1_init_fns,
	30	[ARM_32_LPAE_S2] = &io_pgtable_arm_32_lpae_s2_init_fns,
	31	[ARM_64_LPAE_S1] = &io_pgtable_arm_64_lpae_s1_init_fns,
	32	[ARM_64_LPAE_S2] = &io_pgtable_arm_64_lpae_s2_init_fns,
	33	#endif
e5fc9753 RM	34	#ifdef CONFIG_IOMMU_IO_PGTABLE_ARMV7S
	35	[ARM_V7S] = &io_pgtable_arm_v7s_init_fns,
	36	#endif
fdb1d7be WD	37	};
	38
	39	struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt,
	40	struct io_pgtable_cfg *cfg,
	41	void *cookie)
	42	{
	43	struct io_pgtable *iop;
	44	const struct io_pgtable_init_fns *fns;
	45
	46	if (fmt >= IO_PGTABLE_NUM_FMTS)
	47	return NULL;
	48
	49	fns = io_pgtable_init_table[fmt];
	50	if (!fns)
	51	return NULL;
	52
	53	iop = fns->alloc(cfg, cookie);
	54	if (!iop)
	55	return NULL;
	56
	57	iop->fmt = fmt;
	58	iop->cookie = cookie;
	59	iop->cfg = *cfg;
	60
	61	return &iop->ops;
	62	}
b77cf11f	63	EXPORT_SYMBOL_GPL(alloc_io_pgtable_ops);
fdb1d7be WD	64
	65	/*
	66	* It is the IOMMU driver's responsibility to ensure that the page table
	67	* is no longer accessible to the walker by this point.
	68	*/
	69	void free_io_pgtable_ops(struct io_pgtable_ops *ops)
	70	{
	71	struct io_pgtable *iop;
	72
	73	if (!ops)
	74	return;
	75
	76	iop = container_of(ops, struct io_pgtable, ops);
507e4c9d	77	io_pgtable_tlb_flush_all(iop);
fdb1d7be WD	78	io_pgtable_init_table[iop->fmt]->free(iop);
fdb1d7be WD	79	}
b77cf11f	80	EXPORT_SYMBOL_GPL(free_io_pgtable_ops);