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Message-Id: <20160831072853.27822-16-dwalter@sigma-star.at>
Date: Wed, 31 Aug 2016 09:28:22 +0200
From: Daniel Walter <dwalter@...ma-star.at>
To: linux-mtd@...ts.infradead.org
Cc: Richard Weinberger <richard@....at>, linux-kernel@...r.kernel.org
Subject: [PATCH 15/46] mtd: nandsim: Introduce backend operations
From: Richard Weinberger <richard@....at>
...to untangle the ram based and cachefile based
code.
It will help us later supporting different backends.
Signed-off-by: Richard Weinberger <richard@....at>
---
drivers/mtd/nand/nandsim.c | 400 ++++++++++++++++++++++++++-------------------
1 file changed, 228 insertions(+), 172 deletions(-)
diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
index 2e02089..633872a 100644
--- a/drivers/mtd/nand/nandsim.c
+++ b/drivers/mtd/nand/nandsim.c
@@ -314,6 +314,7 @@ struct nandsim_params {
unsigned int bbt;
unsigned int bch;
unsigned char *id_bytes;
+ struct ns_backend_ops *bops;
};
struct nandsim_debug_info {
@@ -329,6 +330,22 @@ union ns_mem {
uint16_t *word; /* for 16-bit word access */
};
+struct ns_ram_data {
+ /* The simulated NAND flash pages array */
+ union ns_mem *pages;
+
+ /* Slab allocator for nand pages */
+ struct kmem_cache *nand_pages_slab;
+};
+
+struct ns_cachefile_data {
+ struct file *cfile; /* Open file */
+ unsigned long *pages_written; /* Which pages have been written */
+ void *file_buf;
+ struct page *held_pages[NS_MAX_HELD_PAGES];
+ int held_cnt;
+};
+
/*
* The structure which describes all the internal simulator data.
*/
@@ -348,12 +365,6 @@ struct nandsim {
uint16_t npstates; /* number of previous states saved */
uint16_t stateidx; /* current state index */
- /* The simulated NAND flash pages array */
- union ns_mem *pages;
-
- /* Slab allocator for nand pages */
- struct kmem_cache *nand_pages_slab;
-
/* Internal buffer of page + OOB size bytes */
union ns_mem buf;
@@ -394,12 +405,8 @@ struct nandsim {
int wp; /* write Protect */
} lines;
- /* Fields needed when using a cache file */
- struct file *cfile; /* Open file */
- unsigned long *pages_written; /* Which pages have been written */
- void *file_buf;
- struct page *held_pages[NS_MAX_HELD_PAGES];
- int held_cnt;
+ struct ns_backend_ops *bops;
+ void *backend_data;
struct list_head weak_blocks;
struct list_head weak_pages;
@@ -420,6 +427,17 @@ struct nandsim {
struct nandsim_debug_info dbg;
};
+struct ns_backend_ops {
+ void (*erase_sector)(struct nandsim *ns);
+ int (*prog_page)(struct nandsim *ns, int num);
+ void (*read_page)(struct nandsim *ns, int num);
+ int (*init)(struct nandsim *ns, struct nandsim_params *nsparam);
+ void (*destroy)(struct nandsim *ns);
+};
+
+static struct ns_backend_ops ns_ram_bops;
+static struct ns_backend_ops ns_cachefile_bops;
+
/*
* Operations array. To perform any operation the simulator must pass
* through the correspondent states chain.
@@ -641,95 +659,105 @@ static void nandsim_debugfs_remove(struct nandsim *ns)
debugfs_remove_recursive(ns->dbg.dfs_root);
}
-/*
- * Allocate array of page pointers, create slab allocation for an array
- * and initialize the array by NULL pointers.
- *
- * RETURNS: 0 if success, -ENOMEM if memory alloc fails.
- */
-static int alloc_device(struct nandsim *ns, struct nandsim_params *nsparam)
+static int ns_ram_init(struct nandsim *ns, struct nandsim_params *nsparam)
{
- struct file *cfile;
- int i, err;
-
- if (nsparam->cache_file) {
- cfile = filp_open(nsparam->cache_file, O_CREAT | O_RDWR | O_LARGEFILE, 0600);
- if (IS_ERR(cfile))
- return PTR_ERR(cfile);
- if (!(cfile->f_mode & FMODE_CAN_READ)) {
- NS_ERR("alloc_device: cache file not readable\n");
- err = -EINVAL;
- goto err_close;
- }
- if (!(cfile->f_mode & FMODE_CAN_WRITE)) {
- NS_ERR("alloc_device: cache file not writeable\n");
- err = -EINVAL;
- goto err_close;
- }
- ns->pages_written = vzalloc(BITS_TO_LONGS(ns->geom.pgnum) *
- sizeof(unsigned long));
- if (!ns->pages_written) {
- NS_ERR("alloc_device: unable to allocate pages written array\n");
- err = -ENOMEM;
- goto err_close;
- }
- ns->file_buf = kmalloc(ns->geom.pgszoob, GFP_KERNEL);
- if (!ns->file_buf) {
- NS_ERR("alloc_device: unable to allocate file buf\n");
- err = -ENOMEM;
- goto err_free;
- }
- ns->cfile = cfile;
- return 0;
- }
+ int i;
+ struct ns_ram_data *data = kzalloc(sizeof(*data), GFP_KERNEL);
- ns->pages = vmalloc(ns->geom.pgnum * sizeof(union ns_mem));
- if (!ns->pages) {
+ if (!data)
+ return -ENOMEM;
+
+ data->pages = vmalloc(ns->geom.pgnum * sizeof(union ns_mem));
+ if (!data->pages) {
+ kfree(data);
NS_ERR("alloc_device: unable to allocate page array\n");
return -ENOMEM;
}
for (i = 0; i < ns->geom.pgnum; i++) {
- ns->pages[i].byte = NULL;
+ data->pages[i].byte = NULL;
}
- ns->nand_pages_slab = kmem_cache_create("nandsim",
+
+ data->nand_pages_slab = kmem_cache_create("nandsim",
ns->geom.pgszoob, 0, 0, NULL);
- if (!ns->nand_pages_slab) {
+ if (!data->nand_pages_slab) {
+ vfree(data->pages);
+ kfree(data);
NS_ERR("cache_create: unable to create kmem_cache\n");
return -ENOMEM;
}
+ ns->backend_data = data;
+
+ return 0;
+}
+
+static int ns_cachefile_init(struct nandsim *ns, struct nandsim_params *nsparam)
+{
+ struct file *cfile;
+ int err;
+ struct ns_cachefile_data *data = kzalloc(sizeof(*data), GFP_KERNEL);
+
+ cfile = filp_open(nsparam->cache_file, O_CREAT | O_RDWR | O_LARGEFILE, 0600);
+ if (IS_ERR(cfile))
+ return PTR_ERR(cfile);
+ if (!(cfile->f_mode & FMODE_CAN_READ)) {
+ NS_ERR("alloc_device: cache file not readable\n");
+ err = -EINVAL;
+ goto err_close;
+ }
+ if (!(cfile->f_mode & FMODE_CAN_WRITE)) {
+ NS_ERR("alloc_device: cache file not writeable\n");
+ err = -EINVAL;
+ goto err_close;
+ }
+ data->pages_written = vzalloc(BITS_TO_LONGS(ns->geom.pgnum) *
+ sizeof(unsigned long));
+ if (!data->pages_written) {
+ NS_ERR("alloc_device: unable to allocate pages written array\n");
+ err = -ENOMEM;
+ goto err_close;
+ }
+ data->file_buf = kmalloc(ns->geom.pgszoob, GFP_KERNEL);
+ if (!data->file_buf) {
+ NS_ERR("alloc_device: unable to allocate file buf\n");
+ err = -ENOMEM;
+ goto err_free;
+ }
+ data->cfile = cfile;
+
+ ns->backend_data = data;
+
return 0;
err_free:
- vfree(ns->pages_written);
+ vfree(data->pages_written);
err_close:
filp_close(cfile, NULL);
return err;
}
-/*
- * Free any allocated pages, and free the array of page pointers.
- */
-static void free_device(struct nandsim *ns)
+static void ns_ram_destroy(struct nandsim *ns)
{
+ struct ns_ram_data *data = ns->backend_data;
int i;
- if (ns->cfile) {
- kfree(ns->file_buf);
- vfree(ns->pages_written);
- filp_close(ns->cfile, NULL);
- return;
+ for (i = 0; i < ns->geom.pgnum; i++) {
+ if (data->pages[i].byte)
+ kmem_cache_free(data->nand_pages_slab,
+ data->pages[i].byte);
}
+ kmem_cache_destroy(data->nand_pages_slab);
+ vfree(data->pages);
+ kfree(data);
+}
- if (ns->pages) {
- for (i = 0; i < ns->geom.pgnum; i++) {
- if (ns->pages[i].byte)
- kmem_cache_free(ns->nand_pages_slab,
- ns->pages[i].byte);
- }
- kmem_cache_destroy(ns->nand_pages_slab);
- vfree(ns->pages);
- }
+static void ns_cachefile_destroy(struct nandsim *ns)
+{
+ struct ns_cachefile_data *data = ns->backend_data;
+
+ kfree(data->file_buf);
+ vfree(data->pages_written);
+ filp_close(data->cfile, NULL);
}
static char *get_partition_name(struct nandsim *ns, int i)
@@ -864,7 +892,9 @@ static int init_nandsim(struct mtd_info *mtd, struct nandsim_params *nsparam)
printk("sector address bytes: %u\n", ns->geom.secaddrbytes);
printk("options: %#x\n", ns->options);
- if ((ret = alloc_device(ns, nsparam)) != 0)
+ ns->bops = nsparam->bops;
+
+ if ((ret = ns->bops->init(ns, nsparam)) != 0)
return ret;
/* Allocate / initialize the internal buffer */
@@ -885,9 +915,7 @@ static int init_nandsim(struct mtd_info *mtd, struct nandsim_params *nsparam)
static void free_nandsim(struct nandsim *ns)
{
kfree(ns->buf.byte);
- free_device(ns);
-
- return;
+ ns->bops->destroy(ns);
}
static int parse_badblocks(struct nandsim *ns, struct mtd_info *mtd,
@@ -1418,9 +1446,10 @@ static int find_operation(struct nandsim *ns, uint32_t flag)
static void put_pages(struct nandsim *ns)
{
int i;
+ struct ns_cachefile_data *data = ns->backend_data;
- for (i = 0; i < ns->held_cnt; i++)
- put_page(ns->held_pages[i]);
+ for (i = 0; i < data->held_cnt; i++)
+ put_page(data->held_pages[i]);
}
/* Get page cache pages in advance to provide NOFS memory allocation */
@@ -1429,12 +1458,13 @@ static int get_pages(struct nandsim *ns, struct file *file, size_t count, loff_t
pgoff_t index, start_index, end_index;
struct page *page;
struct address_space *mapping = file->f_mapping;
+ struct ns_cachefile_data *data = ns->backend_data;
start_index = pos >> PAGE_SHIFT;
end_index = (pos + count - 1) >> PAGE_SHIFT;
if (end_index - start_index + 1 > NS_MAX_HELD_PAGES)
return -EINVAL;
- ns->held_cnt = 0;
+ data->held_cnt = 0;
for (index = start_index; index <= end_index; index++) {
page = find_get_page(mapping, index);
if (page == NULL) {
@@ -1449,7 +1479,7 @@ static int get_pages(struct nandsim *ns, struct file *file, size_t count, loff_t
}
unlock_page(page);
}
- ns->held_pages[ns->held_cnt++] = page;
+ data->held_pages[data->held_cnt++] = page;
}
return 0;
}
@@ -1503,7 +1533,9 @@ static ssize_t write_file(struct nandsim *ns, struct file *file, void *buf, size
*/
static inline union ns_mem *NS_GET_PAGE(struct nandsim *ns)
{
- return &(ns->pages[ns->regs.row]);
+ struct ns_ram_data *data = ns->backend_data;
+
+ return &(data->pages[ns->regs.row]);
}
/*
@@ -1545,36 +1577,10 @@ static void do_bit_flips(struct nandsim *ns, int num)
}
}
-/*
- * Fill the NAND buffer with data read from the specified page.
- */
-static void read_page(struct nandsim *ns, int num)
+static void ns_ram_read_page(struct nandsim *ns, int num)
{
union ns_mem *mypage;
- if (ns->cfile) {
- if (!test_bit(ns->regs.row, ns->pages_written)) {
- NS_DBG("read_page: page %d not written\n", ns->regs.row);
- memset(ns->buf.byte, 0xFF, num);
- } else {
- loff_t pos;
- ssize_t tx;
-
- NS_DBG("read_page: page %d written, reading from %d\n",
- ns->regs.row, ns->regs.column + ns->regs.off);
- if (do_read_error(ns, num))
- return;
- pos = (loff_t)NS_RAW_OFFSET(ns) + ns->regs.off;
- tx = read_file(ns, ns->cfile, ns->buf.byte, num, pos);
- if (tx != num) {
- NS_ERR("read_page: read error for page %d ret %ld\n", ns->regs.row, (long)tx);
- return;
- }
- do_bit_flips(ns, num);
- }
- return;
- }
-
mypage = NS_GET_PAGE(ns);
if (mypage->byte == NULL) {
NS_DBG("read_page: page %d not allocated\n", ns->regs.row);
@@ -1589,81 +1595,67 @@ static void read_page(struct nandsim *ns, int num)
}
}
-/*
- * Erase all pages in the specified sector.
- */
-static void erase_sector(struct nandsim *ns)
+static void ns_cachefile_read_page(struct nandsim *ns, int num)
{
- union ns_mem *mypage;
- int i;
+ struct ns_cachefile_data *data = ns->backend_data;
- if (ns->cfile) {
- for (i = 0; i < ns->geom.pgsec; i++)
- if (__test_and_clear_bit(ns->regs.row + i,
- ns->pages_written)) {
- NS_DBG("erase_sector: freeing page %d\n", ns->regs.row + i);
- }
- return;
+ if (!test_bit(ns->regs.row, data->pages_written)) {
+ NS_DBG("read_page: page %d not written\n", ns->regs.row);
+ memset(ns->buf.byte, 0xFF, num);
+ } else {
+ loff_t pos;
+ ssize_t tx;
+
+ NS_DBG("read_page: page %d written, reading from %d\n",
+ ns->regs.row, ns->regs.column + ns->regs.off);
+ if (do_read_error(ns, num))
+ return;
+ pos = (loff_t)NS_RAW_OFFSET(ns) + ns->regs.off;
+ tx = read_file(ns, data->cfile, ns->buf.byte, num, pos);
+ if (tx != num) {
+ NS_ERR("read_page: read error for page %d ret %ld\n", ns->regs.row, (long)tx);
+ return;
+ }
+ do_bit_flips(ns, num);
}
+}
+
+static void ns_ram_erase_sector(struct nandsim *ns)
+{
+ union ns_mem *mypage;
+ int i;
+ struct ns_ram_data *data = ns->backend_data;
mypage = NS_GET_PAGE(ns);
for (i = 0; i < ns->geom.pgsec; i++) {
if (mypage->byte != NULL) {
NS_DBG("erase_sector: freeing page %d\n", ns->regs.row+i);
- kmem_cache_free(ns->nand_pages_slab, mypage->byte);
+ kmem_cache_free(data->nand_pages_slab, mypage->byte);
mypage->byte = NULL;
}
mypage++;
}
}
-/*
- * Program the specified page with the contents from the NAND buffer.
- */
-static int prog_page(struct nandsim *ns, int num)
+static void ns_cachefile_erase_sector(struct nandsim *ns)
{
int i;
- union ns_mem *mypage;
- u_char *pg_off;
+ struct ns_cachefile_data *data = ns->backend_data;
- if (ns->cfile) {
- loff_t off;
- ssize_t tx;
- int all;
-
- NS_DBG("prog_page: writing page %d\n", ns->regs.row);
- pg_off = ns->file_buf + ns->regs.column + ns->regs.off;
- off = (loff_t)NS_RAW_OFFSET(ns) + ns->regs.off;
- if (!test_bit(ns->regs.row, ns->pages_written)) {
- all = 1;
- memset(ns->file_buf, 0xff, ns->geom.pgszoob);
- } else {
- all = 0;
- tx = read_file(ns, ns->cfile, pg_off, num, off);
- if (tx != num) {
- NS_ERR("prog_page: read error for page %d ret %ld\n", ns->regs.row, (long)tx);
- return -1;
- }
- }
- for (i = 0; i < num; i++)
- pg_off[i] &= ns->buf.byte[i];
- if (all) {
- loff_t pos = (loff_t)ns->regs.row * ns->geom.pgszoob;
- tx = write_file(ns, ns->cfile, ns->file_buf, ns->geom.pgszoob, pos);
- if (tx != ns->geom.pgszoob) {
- NS_ERR("prog_page: write error for page %d ret %ld\n", ns->regs.row, (long)tx);
- return -1;
- }
- __set_bit(ns->regs.row, ns->pages_written);
- } else {
- tx = write_file(ns, ns->cfile, pg_off, num, off);
- if (tx != num) {
- NS_ERR("prog_page: write error for page %d ret %ld\n", ns->regs.row, (long)tx);
- return -1;
- }
+ for (i = 0; i < ns->geom.pgsec; i++) {
+ if (__test_and_clear_bit(ns->regs.row + i,
+ data->pages_written)) {
+ NS_DBG("erase_sector: freeing page %d\n", ns->regs.row + i);
}
- return 0;
}
+}
+
+static int ns_ram_prog_page(struct nandsim *ns, int num)
+{
+ int i;
+ union ns_mem *mypage;
+ u_char *pg_off;
+ struct ns_ram_data *data = ns->backend_data;
mypage = NS_GET_PAGE(ns);
if (mypage->byte == NULL) {
@@ -1674,7 +1666,7 @@ static int prog_page(struct nandsim *ns, int num)
* then kernel memory alloc runs writeback which goes to the FS
* again and deadlocks. This was seen in practice.
*/
- mypage->byte = kmem_cache_alloc(ns->nand_pages_slab, GFP_NOFS);
+ mypage->byte = kmem_cache_alloc(data->nand_pages_slab, GFP_NOFS);
if (mypage->byte == NULL) {
NS_ERR("prog_page: error allocating memory for page %d\n", ns->regs.row);
return -1;
@@ -1689,6 +1681,65 @@ static int prog_page(struct nandsim *ns, int num)
return 0;
}
+static int ns_cachefile_prog_page(struct nandsim *ns, int num)
+{
+ int i, all;
+ loff_t off;
+ ssize_t tx;
+ u_char *pg_off;
+ struct ns_cachefile_data *data = ns->backend_data;
+
+ NS_DBG("prog_page: writing page %d\n", ns->regs.row);
+ pg_off = data->file_buf + ns->regs.column + ns->regs.off;
+ off = (loff_t)NS_RAW_OFFSET(ns) + ns->regs.off;
+ if (!test_bit(ns->regs.row, data->pages_written)) {
+ all = 1;
+ memset(data->file_buf, 0xff, ns->geom.pgszoob);
+ } else {
+ all = 0;
+ tx = read_file(ns, data->cfile, pg_off, num, off);
+ if (tx != num) {
+ NS_ERR("prog_page: read error for page %d ret %ld\n", ns->regs.row, (long)tx);
+ return -1;
+ }
+ }
+ for (i = 0; i < num; i++)
+ pg_off[i] &= ns->buf.byte[i];
+ if (all) {
+ loff_t pos = (loff_t)ns->regs.row * ns->geom.pgszoob;
+ tx = write_file(ns, data->cfile, data->file_buf, ns->geom.pgszoob, pos);
+ if (tx != ns->geom.pgszoob) {
+ NS_ERR("prog_page: write error for page %d ret %ld\n", ns->regs.row, (long)tx);
+ return -1;
+ }
+ __set_bit(ns->regs.row, data->pages_written);
+ } else {
+ tx = write_file(ns, data->cfile, pg_off, num, off);
+ if (tx != num) {
+ NS_ERR("prog_page: write error for page %d ret %ld\n", ns->regs.row, (long)tx);
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static struct ns_backend_ops ns_ram_bops = {
+ .erase_sector = ns_ram_erase_sector,
+ .prog_page = ns_ram_prog_page,
+ .read_page = ns_ram_read_page,
+ .init = ns_ram_init,
+ .destroy = ns_ram_destroy,
+};
+
+static struct ns_backend_ops ns_cachefile_bops = {
+ .erase_sector = ns_cachefile_erase_sector,
+ .prog_page = ns_cachefile_prog_page,
+ .read_page = ns_cachefile_read_page,
+ .init = ns_cachefile_init,
+ .destroy = ns_cachefile_destroy,
+};
+
+
/*
* If state has any action bit, perform this action.
*
@@ -1721,7 +1772,7 @@ static int do_state_action(struct nandsim *ns, uint32_t action)
break;
}
num = ns->geom.pgszoob - ns->regs.off - ns->regs.column;
- read_page(ns, num);
+ ns->bops->read_page(ns, num);
NS_DBG("do_state_action: (ACTION_CPY:) copy %d bytes to int buf, raw offset %d\n",
num, NS_RAW_OFFSET(ns) + ns->regs.off);
@@ -1764,7 +1815,7 @@ static int do_state_action(struct nandsim *ns, uint32_t action)
ns->regs.row, NS_RAW_OFFSET(ns));
NS_LOG("erase sector %u\n", erase_block_no);
- erase_sector(ns);
+ ns->bops->erase_sector(ns);
NS_MDELAY(ns, ns->erase_delay);
@@ -1795,7 +1846,7 @@ static int do_state_action(struct nandsim *ns, uint32_t action)
return -1;
}
- if (prog_page(ns, num) == -1)
+ if (ns->bops->prog_page(ns, num) == -1)
return -1;
page_no = ns->regs.row;
@@ -2603,6 +2654,11 @@ static int __init ns_init_default(void)
nsparam->bch = bch;
nsparam->id_bytes = id_bytes;
+ if (!nsparam->cache_file)
+ nsparam->bops = &ns_ram_bops;
+ else
+ nsparam->bops = &ns_cachefile_bops;
+
ret = ns_new_instance(nsparam);
kfree(nsparam);
--
2.8.3
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