freebsd-dev/sys/dev/nand/nandsim_swap.c

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/*-
* Copyright (C) 2009-2012 Semihalf
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/fcntl.h>
#include <sys/proc.h>
#include <sys/namei.h>
#include <sys/lock.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <dev/nand/nandsim_chip.h>
#include <dev/nand/nandsim_swap.h>
static int init_block_state(struct chip_swap *);
static void destroy_block_state(struct chip_swap *);
static int create_buffers(struct chip_swap *);
static void destroy_buffers(struct chip_swap *);
static int swap_file_open(struct chip_swap *, const char *);
static void swap_file_close(struct chip_swap *);
static int swap_file_write(struct chip_swap *, struct block_state *);
static int swap_file_read(struct chip_swap *, struct block_state *);
#define CHIP_SWAP_CMODE 0600
#define CHIP_SWAP_BLOCKSPACES 2
static int
init_block_state(struct chip_swap *swap)
{
struct block_state *blk_state;
int i;
if (swap == NULL)
return (-1);
blk_state = malloc(swap->nof_blks * sizeof(struct block_state),
M_NANDSIM, M_WAITOK | M_ZERO);
for (i = 0; i < swap->nof_blks; i++)
blk_state[i].offset = 0xffffffff;
swap->blk_state = blk_state;
return (0);
}
static void
destroy_block_state(struct chip_swap *swap)
{
if (swap == NULL)
return;
if (swap->blk_state != NULL)
free(swap->blk_state, M_NANDSIM);
}
static int
create_buffers(struct chip_swap *swap)
{
struct block_space *block_space;
void *block;
int i;
for (i = 0; i < CHIP_SWAP_BLOCKSPACES; i++) {
block_space = malloc(sizeof(*block_space), M_NANDSIM, M_WAITOK);
block = malloc(swap->blk_size, M_NANDSIM, M_WAITOK);
block_space->blk_ptr = block;
SLIST_INSERT_HEAD(&swap->free_bs, block_space, free_link);
nand_debug(NDBG_SIM,"created blk_space %p[%p]\n", block_space,
block);
}
if (i == 0)
return (-1);
return (0);
}
static void
destroy_buffers(struct chip_swap *swap)
{
struct block_space *blk_space;
if (swap == NULL)
return;
blk_space = SLIST_FIRST(&swap->free_bs);
while (blk_space) {
SLIST_REMOVE_HEAD(&swap->free_bs, free_link);
nand_debug(NDBG_SIM,"destroyed blk_space %p[%p]\n",
blk_space, blk_space->blk_ptr);
free(blk_space->blk_ptr, M_NANDSIM);
free(blk_space, M_NANDSIM);
blk_space = SLIST_FIRST(&swap->free_bs);
}
blk_space = STAILQ_FIRST(&swap->used_bs);
while (blk_space) {
STAILQ_REMOVE_HEAD(&swap->used_bs, used_link);
nand_debug(NDBG_SIM,"destroyed blk_space %p[%p]\n",
blk_space, blk_space->blk_ptr);
free(blk_space->blk_ptr, M_NANDSIM);
free(blk_space, M_NANDSIM);
blk_space = STAILQ_FIRST(&swap->used_bs);
}
}
static int
swap_file_open(struct chip_swap *swap, const char *swap_file)
{
struct nameidata nd;
int flags, error;
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, swap_file,
curthread);
flags = FWRITE | FREAD | O_NOFOLLOW | O_CREAT | O_TRUNC;
error = vn_open(&nd, &flags, CHIP_SWAP_CMODE, NULL);
if (error) {
nand_debug(NDBG_SIM,"Cannot create swap file %s", swap_file);
NDFREE(&nd, NDF_ONLY_PNBUF);
return (error);
}
swap->swap_cred = crhold(curthread->td_ucred);
NDFREE(&nd, NDF_ONLY_PNBUF);
/* We just unlock so we hold a reference */
VOP_UNLOCK(nd.ni_vp, 0);
swap->swap_vp = nd.ni_vp;
return (0);
}
static void
swap_file_close(struct chip_swap *swap)
{
if (swap == NULL)
return;
if (swap->swap_vp == NULL)
return;
vn_close(swap->swap_vp, FWRITE, swap->swap_cred, curthread);
crfree(swap->swap_cred);
}
static int
swap_file_write(struct chip_swap *swap, struct block_state *blk_state)
{
struct block_space *blk_space;
struct thread *td;
struct mount *mp;
struct vnode *vp;
struct uio auio;
struct iovec aiov;
if (swap == NULL || blk_state == NULL)
return (-1);
blk_space = blk_state->blk_sp;
if (blk_state->offset == -1) {
blk_state->offset = swap->swap_offset;
swap->swap_offset += swap->blk_size;
}
nand_debug(NDBG_SIM,"saving %p[%p] at %x\n",
blk_space, blk_space->blk_ptr, blk_state->offset);
bzero(&aiov, sizeof(aiov));
bzero(&auio, sizeof(auio));
aiov.iov_base = blk_space->blk_ptr;
aiov.iov_len = swap->blk_size;
td = curthread;
vp = swap->swap_vp;
auio.uio_iov = &aiov;
auio.uio_offset = blk_state->offset;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_WRITE;
auio.uio_iovcnt = 1;
auio.uio_resid = swap->blk_size;
auio.uio_td = td;
vn_start_write(vp, &mp, V_WAIT);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
VOP_WRITE(vp, &auio, IO_UNIT, swap->swap_cred);
VOP_UNLOCK(vp, 0);
vn_finished_write(mp);
return (0);
}
static int
swap_file_read(struct chip_swap *swap, struct block_state *blk_state)
{
struct block_space *blk_space;
struct thread *td;
struct vnode *vp;
struct uio auio;
struct iovec aiov;
if (swap == NULL || blk_state == NULL)
return (-1);
blk_space = blk_state->blk_sp;
nand_debug(NDBG_SIM,"restore %p[%p] at %x\n",
blk_space, blk_space->blk_ptr, blk_state->offset);
bzero(&aiov, sizeof(aiov));
bzero(&auio, sizeof(auio));
aiov.iov_base = blk_space->blk_ptr;
aiov.iov_len = swap->blk_size;
td = curthread;
vp = swap->swap_vp;
auio.uio_iov = &aiov;
auio.uio_offset = blk_state->offset;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_READ;
auio.uio_iovcnt = 1;
auio.uio_resid = swap->blk_size;
auio.uio_td = td;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
VOP_READ(vp, &auio, 0, swap->swap_cred);
VOP_UNLOCK(vp, 0);
return (0);
}
struct chip_swap *
nandsim_swap_init(const char *swap_file, uint32_t nof_blks, uint32_t blk_size)
{
struct chip_swap *swap;
int err = 0;
if ((swap_file == NULL) || (nof_blks == 0) || (blk_size == 0))
return (NULL);
swap = malloc(sizeof(*swap), M_NANDSIM, M_WAITOK | M_ZERO);
SLIST_INIT(&swap->free_bs);
STAILQ_INIT(&swap->used_bs);
swap->blk_size = blk_size;
swap->nof_blks = nof_blks;
err = init_block_state(swap);
if (err) {
nandsim_swap_destroy(swap);
return (NULL);
}
err = create_buffers(swap);
if (err) {
nandsim_swap_destroy(swap);
return (NULL);
}
err = swap_file_open(swap, swap_file);
if (err) {
nandsim_swap_destroy(swap);
return (NULL);
}
return (swap);
}
void
nandsim_swap_destroy(struct chip_swap *swap)
{
if (swap == NULL)
return;
destroy_block_state(swap);
destroy_buffers(swap);
swap_file_close(swap);
free(swap, M_NANDSIM);
}
struct block_space *
get_bs(struct chip_swap *swap, uint32_t block, uint8_t writing)
{
struct block_state *blk_state, *old_blk_state = NULL;
struct block_space *blk_space;
if (swap == NULL || (block >= swap->nof_blks))
return (NULL);
blk_state = &swap->blk_state[block];
nand_debug(NDBG_SIM,"blk_state %x\n", blk_state->status);
if (blk_state->status & BLOCK_ALLOCATED) {
blk_space = blk_state->blk_sp;
} else {
blk_space = SLIST_FIRST(&swap->free_bs);
if (blk_space) {
SLIST_REMOVE_HEAD(&swap->free_bs, free_link);
STAILQ_INSERT_TAIL(&swap->used_bs, blk_space,
used_link);
} else {
blk_space = STAILQ_FIRST(&swap->used_bs);
old_blk_state = blk_space->blk_state;
STAILQ_REMOVE_HEAD(&swap->used_bs, used_link);
STAILQ_INSERT_TAIL(&swap->used_bs, blk_space,
used_link);
if (old_blk_state->status & BLOCK_DIRTY) {
swap_file_write(swap, old_blk_state);
old_blk_state->status &= ~BLOCK_DIRTY;
old_blk_state->status |= BLOCK_SWAPPED;
}
}
}
if (blk_space == NULL)
return (NULL);
if (old_blk_state != NULL) {
old_blk_state->status &= ~BLOCK_ALLOCATED;
old_blk_state->blk_sp = NULL;
}
blk_state->blk_sp = blk_space;
blk_space->blk_state = blk_state;
if (!(blk_state->status & BLOCK_ALLOCATED)) {
if (blk_state->status & BLOCK_SWAPPED)
swap_file_read(swap, blk_state);
else
memset(blk_space->blk_ptr, 0xff, swap->blk_size);
blk_state->status |= BLOCK_ALLOCATED;
}
if (writing)
blk_state->status |= BLOCK_DIRTY;
nand_debug(NDBG_SIM,"get_bs returned %p[%p] state %x\n", blk_space,
blk_space->blk_ptr, blk_state->status);
return (blk_space);
}