e1d3c0fd70
A number of IOMMUs found in ARM SoCs can walk architecture-compatible page tables. This patch adds a generic allocator for Stage-1 and Stage-2 v7/v8 long-descriptor page tables. 4k, 16k and 64k pages are supported, with up to 4-levels of walk to cover a 48-bit address space. Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
82 lines
2.2 KiB
C
82 lines
2.2 KiB
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/kernel.h>
|
|
#include <linux/types.h>
|
|
|
|
#include "io-pgtable.h"
|
|
|
|
extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns;
|
|
extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns;
|
|
extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns;
|
|
extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns;
|
|
|
|
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
|
|
};
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
iop->cfg.tlb->tlb_flush_all(iop->cookie);
|
|
io_pgtable_init_table[iop->fmt]->free(iop);
|
|
}
|