提交 514087e7 编写于 作者: A Adrian Hunter 提交者: David Woodhouse

[MTD] nandsim: enhance nandsim to simulate flash errors

New module parameters have been added to nandsim to
simulate:

        bitflips        random bit flips
        badblocks       blocks that are initially marked bad
        weakblocks      blocks that fail to erase after a
                        small number of erase cycles
        weakpages       pages that fail to write after a
                        small number of successful writes
        gravepages      pages that fail to read after a
                        small number of successful reads
Signed-off-by: NAdrian Hunter <ext-adrian.hunter@nokia.com>
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: NDavid Woodhouse <dwmw2@infradead.org>
上级 2b77a0ed
...@@ -38,6 +38,7 @@ ...@@ -38,6 +38,7 @@
#include <linux/mtd/partitions.h> #include <linux/mtd/partitions.h>
#include <linux/delay.h> #include <linux/delay.h>
#include <linux/list.h> #include <linux/list.h>
#include <linux/random.h>
/* Default simulator parameters values */ /* Default simulator parameters values */
#if !defined(CONFIG_NANDSIM_FIRST_ID_BYTE) || \ #if !defined(CONFIG_NANDSIM_FIRST_ID_BYTE) || \
...@@ -93,6 +94,11 @@ static uint log = CONFIG_NANDSIM_LOG; ...@@ -93,6 +94,11 @@ static uint log = CONFIG_NANDSIM_LOG;
static uint dbg = CONFIG_NANDSIM_DBG; static uint dbg = CONFIG_NANDSIM_DBG;
static unsigned long parts[MAX_MTD_DEVICES]; static unsigned long parts[MAX_MTD_DEVICES];
static unsigned int parts_num; static unsigned int parts_num;
static char *badblocks = NULL;
static char *weakblocks = NULL;
static char *weakpages = NULL;
static unsigned int bitflips = 0;
static char *gravepages = NULL;
module_param(first_id_byte, uint, 0400); module_param(first_id_byte, uint, 0400);
module_param(second_id_byte, uint, 0400); module_param(second_id_byte, uint, 0400);
...@@ -108,6 +114,11 @@ module_param(do_delays, uint, 0400); ...@@ -108,6 +114,11 @@ module_param(do_delays, uint, 0400);
module_param(log, uint, 0400); module_param(log, uint, 0400);
module_param(dbg, uint, 0400); module_param(dbg, uint, 0400);
module_param_array(parts, ulong, &parts_num, 0400); module_param_array(parts, ulong, &parts_num, 0400);
module_param(badblocks, charp, 0400);
module_param(weakblocks, charp, 0400);
module_param(weakpages, charp, 0400);
module_param(bitflips, uint, 0400);
module_param(gravepages, charp, 0400);
MODULE_PARM_DESC(first_id_byte, "The fist byte returned by NAND Flash 'read ID' command (manufaturer ID)"); MODULE_PARM_DESC(first_id_byte, "The fist byte returned by NAND Flash 'read ID' command (manufaturer ID)");
MODULE_PARM_DESC(second_id_byte, "The second byte returned by NAND Flash 'read ID' command (chip ID)"); MODULE_PARM_DESC(second_id_byte, "The second byte returned by NAND Flash 'read ID' command (chip ID)");
...@@ -123,6 +134,18 @@ MODULE_PARM_DESC(do_delays, "Simulate NAND delays using busy-waits if not z ...@@ -123,6 +134,18 @@ MODULE_PARM_DESC(do_delays, "Simulate NAND delays using busy-waits if not z
MODULE_PARM_DESC(log, "Perform logging if not zero"); MODULE_PARM_DESC(log, "Perform logging if not zero");
MODULE_PARM_DESC(dbg, "Output debug information if not zero"); MODULE_PARM_DESC(dbg, "Output debug information if not zero");
MODULE_PARM_DESC(parts, "Partition sizes (in erase blocks) separated by commas"); MODULE_PARM_DESC(parts, "Partition sizes (in erase blocks) separated by commas");
/* Page and erase block positions for the following parameters are independent of any partitions */
MODULE_PARM_DESC(badblocks, "Erase blocks that are initially marked bad, separated by commas");
MODULE_PARM_DESC(weakblocks, "Weak erase blocks [: remaining erase cycles (defaults to 3)]"
" separated by commas e.g. 113:2 means eb 113"
" can be erased only twice before failing");
MODULE_PARM_DESC(weakpages, "Weak pages [: maximum writes (defaults to 3)]"
" separated by commas e.g. 1401:2 means page 1401"
" can be written only twice before failing");
MODULE_PARM_DESC(bitflips, "Maximum number of random bit flips per page (zero by default)");
MODULE_PARM_DESC(gravepages, "Pages that lose data [: maximum reads (defaults to 3)]"
" separated by commas e.g. 1401:2 means page 1401"
" can be read only twice before failing");
/* The largest possible page size */ /* The largest possible page size */
#define NS_LARGEST_PAGE_SIZE 2048 #define NS_LARGEST_PAGE_SIZE 2048
...@@ -344,6 +367,33 @@ static struct nandsim_operations { ...@@ -344,6 +367,33 @@ static struct nandsim_operations {
STATE_DATAOUT, STATE_READY}} STATE_DATAOUT, STATE_READY}}
}; };
struct weak_block {
struct list_head list;
unsigned int erase_block_no;
unsigned int max_erases;
unsigned int erases_done;
};
static LIST_HEAD(weak_blocks);
struct weak_page {
struct list_head list;
unsigned int page_no;
unsigned int max_writes;
unsigned int writes_done;
};
static LIST_HEAD(weak_pages);
struct grave_page {
struct list_head list;
unsigned int page_no;
unsigned int max_reads;
unsigned int reads_done;
};
static LIST_HEAD(grave_pages);
/* MTD structure for NAND controller */ /* MTD structure for NAND controller */
static struct mtd_info *nsmtd; static struct mtd_info *nsmtd;
...@@ -555,6 +605,204 @@ static void free_nandsim(struct nandsim *ns) ...@@ -555,6 +605,204 @@ static void free_nandsim(struct nandsim *ns)
return; return;
} }
static int parse_badblocks(struct nandsim *ns, struct mtd_info *mtd)
{
char *w;
int zero_ok;
unsigned int erase_block_no;
loff_t offset;
if (!badblocks)
return 0;
w = badblocks;
do {
zero_ok = (*w == '0' ? 1 : 0);
erase_block_no = simple_strtoul(w, &w, 0);
if (!zero_ok && !erase_block_no) {
NS_ERR("invalid badblocks.\n");
return -EINVAL;
}
offset = erase_block_no * ns->geom.secsz;
if (mtd->block_markbad(mtd, offset)) {
NS_ERR("invalid badblocks.\n");
return -EINVAL;
}
if (*w == ',')
w += 1;
} while (*w);
return 0;
}
static int parse_weakblocks(void)
{
char *w;
int zero_ok;
unsigned int erase_block_no;
unsigned int max_erases;
struct weak_block *wb;
if (!weakblocks)
return 0;
w = weakblocks;
do {
zero_ok = (*w == '0' ? 1 : 0);
erase_block_no = simple_strtoul(w, &w, 0);
if (!zero_ok && !erase_block_no) {
NS_ERR("invalid weakblocks.\n");
return -EINVAL;
}
max_erases = 3;
if (*w == ':') {
w += 1;
max_erases = simple_strtoul(w, &w, 0);
}
if (*w == ',')
w += 1;
wb = kzalloc(sizeof(*wb), GFP_KERNEL);
if (!wb) {
NS_ERR("unable to allocate memory.\n");
return -ENOMEM;
}
wb->erase_block_no = erase_block_no;
wb->max_erases = max_erases;
list_add(&wb->list, &weak_blocks);
} while (*w);
return 0;
}
static int erase_error(unsigned int erase_block_no)
{
struct weak_block *wb;
list_for_each_entry(wb, &weak_blocks, list)
if (wb->erase_block_no == erase_block_no) {
if (wb->erases_done >= wb->max_erases)
return 1;
wb->erases_done += 1;
return 0;
}
return 0;
}
static int parse_weakpages(void)
{
char *w;
int zero_ok;
unsigned int page_no;
unsigned int max_writes;
struct weak_page *wp;
if (!weakpages)
return 0;
w = weakpages;
do {
zero_ok = (*w == '0' ? 1 : 0);
page_no = simple_strtoul(w, &w, 0);
if (!zero_ok && !page_no) {
NS_ERR("invalid weakpagess.\n");
return -EINVAL;
}
max_writes = 3;
if (*w == ':') {
w += 1;
max_writes = simple_strtoul(w, &w, 0);
}
if (*w == ',')
w += 1;
wp = kzalloc(sizeof(*wp), GFP_KERNEL);
if (!wp) {
NS_ERR("unable to allocate memory.\n");
return -ENOMEM;
}
wp->page_no = page_no;
wp->max_writes = max_writes;
list_add(&wp->list, &weak_pages);
} while (*w);
return 0;
}
static int write_error(unsigned int page_no)
{
struct weak_page *wp;
list_for_each_entry(wp, &weak_pages, list)
if (wp->page_no == page_no) {
if (wp->writes_done >= wp->max_writes)
return 1;
wp->writes_done += 1;
return 0;
}
return 0;
}
static int parse_gravepages(void)
{
char *g;
int zero_ok;
unsigned int page_no;
unsigned int max_reads;
struct grave_page *gp;
if (!gravepages)
return 0;
g = gravepages;
do {
zero_ok = (*g == '0' ? 1 : 0);
page_no = simple_strtoul(g, &g, 0);
if (!zero_ok && !page_no) {
NS_ERR("invalid gravepagess.\n");
return -EINVAL;
}
max_reads = 3;
if (*g == ':') {
g += 1;
max_reads = simple_strtoul(g, &g, 0);
}
if (*g == ',')
g += 1;
gp = kzalloc(sizeof(*gp), GFP_KERNEL);
if (!gp) {
NS_ERR("unable to allocate memory.\n");
return -ENOMEM;
}
gp->page_no = page_no;
gp->max_reads = max_reads;
list_add(&gp->list, &grave_pages);
} while (*g);
return 0;
}
static int read_error(unsigned int page_no)
{
struct grave_page *gp;
list_for_each_entry(gp, &grave_pages, list)
if (gp->page_no == page_no) {
if (gp->reads_done >= gp->max_reads)
return 1;
gp->reads_done += 1;
return 0;
}
return 0;
}
static void free_lists(void)
{
struct list_head *pos, *n;
list_for_each_safe(pos, n, &weak_blocks) {
list_del(pos);
kfree(list_entry(pos, struct weak_block, list));
}
list_for_each_safe(pos, n, &weak_pages) {
list_del(pos);
kfree(list_entry(pos, struct weak_page, list));
}
list_for_each_safe(pos, n, &grave_pages) {
list_del(pos);
kfree(list_entry(pos, struct grave_page, list));
}
}
/* /*
* Returns the string representation of 'state' state. * Returns the string representation of 'state' state.
*/ */
...@@ -867,9 +1115,31 @@ static void read_page(struct nandsim *ns, int num) ...@@ -867,9 +1115,31 @@ static void read_page(struct nandsim *ns, int num)
NS_DBG("read_page: page %d not allocated\n", ns->regs.row); NS_DBG("read_page: page %d not allocated\n", ns->regs.row);
memset(ns->buf.byte, 0xFF, num); memset(ns->buf.byte, 0xFF, num);
} else { } else {
unsigned int page_no = ns->regs.row;
NS_DBG("read_page: page %d allocated, reading from %d\n", NS_DBG("read_page: page %d allocated, reading from %d\n",
ns->regs.row, ns->regs.column + ns->regs.off); ns->regs.row, ns->regs.column + ns->regs.off);
if (read_error(page_no)) {
int i;
memset(ns->buf.byte, 0xFF, num);
for (i = 0; i < num; ++i)
ns->buf.byte[i] = random32();
NS_WARN("simulating read error in page %u\n", page_no);
return;
}
memcpy(ns->buf.byte, NS_PAGE_BYTE_OFF(ns), num); memcpy(ns->buf.byte, NS_PAGE_BYTE_OFF(ns), num);
if (bitflips && random32() < (1 << 22)) {
int flips = 1;
if (bitflips > 1)
flips = (random32() % (int) bitflips) + 1;
while (flips--) {
int pos = random32() % (num * 8);
ns->buf.byte[pos / 8] ^= (1 << (pos % 8));
NS_WARN("read_page: flipping bit %d in page %d "
"reading from %d ecc: corrected=%u failed=%u\n",
pos, ns->regs.row, ns->regs.column + ns->regs.off,
nsmtd->ecc_stats.corrected, nsmtd->ecc_stats.failed);
}
}
} }
} }
...@@ -928,6 +1198,7 @@ static int do_state_action(struct nandsim *ns, uint32_t action) ...@@ -928,6 +1198,7 @@ static int do_state_action(struct nandsim *ns, uint32_t action)
{ {
int num; int num;
int busdiv = ns->busw == 8 ? 1 : 2; int busdiv = ns->busw == 8 ? 1 : 2;
unsigned int erase_block_no, page_no;
action &= ACTION_MASK; action &= ACTION_MASK;
...@@ -987,14 +1258,21 @@ static int do_state_action(struct nandsim *ns, uint32_t action) ...@@ -987,14 +1258,21 @@ static int do_state_action(struct nandsim *ns, uint32_t action)
8 * (ns->geom.pgaddrbytes - ns->geom.secaddrbytes)) | ns->regs.column; 8 * (ns->geom.pgaddrbytes - ns->geom.secaddrbytes)) | ns->regs.column;
ns->regs.column = 0; ns->regs.column = 0;
erase_block_no = ns->regs.row >> (ns->geom.secshift - ns->geom.pgshift);
NS_DBG("do_state_action: erase sector at address %#x, off = %d\n", NS_DBG("do_state_action: erase sector at address %#x, off = %d\n",
ns->regs.row, NS_RAW_OFFSET(ns)); ns->regs.row, NS_RAW_OFFSET(ns));
NS_LOG("erase sector %d\n", ns->regs.row >> (ns->geom.secshift - ns->geom.pgshift)); NS_LOG("erase sector %u\n", erase_block_no);
erase_sector(ns); erase_sector(ns);
NS_MDELAY(erase_delay); NS_MDELAY(erase_delay);
if (erase_error(erase_block_no)) {
NS_WARN("simulating erase failure in erase block %u\n", erase_block_no);
return -1;
}
break; break;
case ACTION_PRGPAGE: case ACTION_PRGPAGE:
...@@ -1017,6 +1295,8 @@ static int do_state_action(struct nandsim *ns, uint32_t action) ...@@ -1017,6 +1295,8 @@ static int do_state_action(struct nandsim *ns, uint32_t action)
if (prog_page(ns, num) == -1) if (prog_page(ns, num) == -1)
return -1; return -1;
page_no = ns->regs.row;
NS_DBG("do_state_action: copy %d bytes from int buf to (%#x, %#x), raw off = %d\n", NS_DBG("do_state_action: copy %d bytes from int buf to (%#x, %#x), raw off = %d\n",
num, ns->regs.row, ns->regs.column, NS_RAW_OFFSET(ns) + ns->regs.off); num, ns->regs.row, ns->regs.column, NS_RAW_OFFSET(ns) + ns->regs.off);
NS_LOG("programm page %d\n", ns->regs.row); NS_LOG("programm page %d\n", ns->regs.row);
...@@ -1024,6 +1304,11 @@ static int do_state_action(struct nandsim *ns, uint32_t action) ...@@ -1024,6 +1304,11 @@ static int do_state_action(struct nandsim *ns, uint32_t action)
NS_UDELAY(programm_delay); NS_UDELAY(programm_delay);
NS_UDELAY(output_cycle * ns->geom.pgsz / 1000 / busdiv); NS_UDELAY(output_cycle * ns->geom.pgsz / 1000 / busdiv);
if (write_error(page_no)) {
NS_WARN("simulating write failure in page %u\n", page_no);
return -1;
}
break; break;
case ACTION_ZEROOFF: case ACTION_ZEROOFF:
...@@ -1602,6 +1887,15 @@ static int __init ns_init_module(void) ...@@ -1602,6 +1887,15 @@ static int __init ns_init_module(void)
nsmtd->owner = THIS_MODULE; nsmtd->owner = THIS_MODULE;
if ((retval = parse_weakblocks()) != 0)
goto error;
if ((retval = parse_weakpages()) != 0)
goto error;
if ((retval = parse_gravepages()) != 0)
goto error;
if ((retval = nand_scan(nsmtd, 1)) != 0) { if ((retval = nand_scan(nsmtd, 1)) != 0) {
NS_ERR("can't register NAND Simulator\n"); NS_ERR("can't register NAND Simulator\n");
if (retval > 0) if (retval > 0)
...@@ -1612,6 +1906,9 @@ static int __init ns_init_module(void) ...@@ -1612,6 +1906,9 @@ static int __init ns_init_module(void)
if ((retval = init_nandsim(nsmtd)) != 0) if ((retval = init_nandsim(nsmtd)) != 0)
goto err_exit; goto err_exit;
if ((retval = parse_badblocks(nand, nsmtd)) != 0)
goto err_exit;
if ((retval = nand_default_bbt(nsmtd)) != 0) if ((retval = nand_default_bbt(nsmtd)) != 0)
goto err_exit; goto err_exit;
...@@ -1628,6 +1925,7 @@ static int __init ns_init_module(void) ...@@ -1628,6 +1925,7 @@ static int __init ns_init_module(void)
kfree(nand->partitions[i].name); kfree(nand->partitions[i].name);
error: error:
kfree(nsmtd); kfree(nsmtd);
free_lists();
return retval; return retval;
} }
...@@ -1647,6 +1945,7 @@ static void __exit ns_cleanup_module(void) ...@@ -1647,6 +1945,7 @@ static void __exit ns_cleanup_module(void)
for (i = 0;i < ARRAY_SIZE(ns->partitions); ++i) for (i = 0;i < ARRAY_SIZE(ns->partitions); ++i)
kfree(ns->partitions[i].name); kfree(ns->partitions[i].name);
kfree(nsmtd); /* Free other structures */ kfree(nsmtd); /* Free other structures */
free_lists();
} }
module_exit(ns_cleanup_module); module_exit(ns_cleanup_module);
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册