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![Michał Kępień](/assets/img/avatar_default.png)
As the 'stats' field in struct mtd_oob_ops is used in conditional expressions, ensure it is always zero-initialized in all such structures to prevent random stack garbage from being interpreted as a pointer. Strictly speaking, this problem currently only needs to be fixed for struct mtd_oob_ops structures subsequently passed to mtd_read_oob(). However, this commit goes a step further and makes all instances of struct mtd_oob_ops in the tree zero-initialized, in hope of preventing future problems, e.g. if struct mtd_req_stats gets extended with write statistics at some point. Signed-off-by: Michał Kępień <kernel@kempniu.pl> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20220629125737.14418-3-kernel@kempniu.pl
1299 lines
30 KiB
C
1299 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright © 2009 - Maxim Levitsky
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* SmartMedia/xD translation layer
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/hdreg.h>
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#include <linux/kthread.h>
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#include <linux/freezer.h>
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#include <linux/sysfs.h>
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#include <linux/bitops.h>
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#include <linux/slab.h>
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#include <linux/mtd/nand-ecc-sw-hamming.h>
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#include "nand/raw/sm_common.h"
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#include "sm_ftl.h"
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static struct workqueue_struct *cache_flush_workqueue;
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static int cache_timeout = 1000;
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module_param(cache_timeout, int, S_IRUGO);
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MODULE_PARM_DESC(cache_timeout,
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"Timeout (in ms) for cache flush (1000 ms default");
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static int debug;
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module_param(debug, int, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug, "Debug level (0-2)");
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/* ------------------- sysfs attributes ---------------------------------- */
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struct sm_sysfs_attribute {
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struct device_attribute dev_attr;
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char *data;
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int len;
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};
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static ssize_t sm_attr_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct sm_sysfs_attribute *sm_attr =
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container_of(attr, struct sm_sysfs_attribute, dev_attr);
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strncpy(buf, sm_attr->data, sm_attr->len);
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return sm_attr->len;
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}
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#define NUM_ATTRIBUTES 1
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#define SM_CIS_VENDOR_OFFSET 0x59
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static struct attribute_group *sm_create_sysfs_attributes(struct sm_ftl *ftl)
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{
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struct attribute_group *attr_group;
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struct attribute **attributes;
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struct sm_sysfs_attribute *vendor_attribute;
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char *vendor;
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vendor = kstrndup(ftl->cis_buffer + SM_CIS_VENDOR_OFFSET,
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SM_SMALL_PAGE - SM_CIS_VENDOR_OFFSET, GFP_KERNEL);
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if (!vendor)
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goto error1;
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/* Initialize sysfs attributes */
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vendor_attribute =
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kzalloc(sizeof(struct sm_sysfs_attribute), GFP_KERNEL);
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if (!vendor_attribute)
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goto error2;
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sysfs_attr_init(&vendor_attribute->dev_attr.attr);
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vendor_attribute->data = vendor;
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vendor_attribute->len = strlen(vendor);
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vendor_attribute->dev_attr.attr.name = "vendor";
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vendor_attribute->dev_attr.attr.mode = S_IRUGO;
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vendor_attribute->dev_attr.show = sm_attr_show;
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/* Create array of pointers to the attributes */
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attributes = kcalloc(NUM_ATTRIBUTES + 1, sizeof(struct attribute *),
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GFP_KERNEL);
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if (!attributes)
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goto error3;
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attributes[0] = &vendor_attribute->dev_attr.attr;
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/* Finally create the attribute group */
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attr_group = kzalloc(sizeof(struct attribute_group), GFP_KERNEL);
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if (!attr_group)
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goto error4;
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attr_group->attrs = attributes;
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return attr_group;
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error4:
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kfree(attributes);
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error3:
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kfree(vendor_attribute);
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error2:
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kfree(vendor);
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error1:
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return NULL;
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}
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static void sm_delete_sysfs_attributes(struct sm_ftl *ftl)
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{
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struct attribute **attributes = ftl->disk_attributes->attrs;
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int i;
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for (i = 0; attributes[i] ; i++) {
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struct device_attribute *dev_attr = container_of(attributes[i],
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struct device_attribute, attr);
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struct sm_sysfs_attribute *sm_attr =
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container_of(dev_attr,
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struct sm_sysfs_attribute, dev_attr);
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kfree(sm_attr->data);
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kfree(sm_attr);
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}
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kfree(ftl->disk_attributes->attrs);
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kfree(ftl->disk_attributes);
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}
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/* ----------------------- oob helpers -------------------------------------- */
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static int sm_get_lba(uint8_t *lba)
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{
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/* check fixed bits */
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if ((lba[0] & 0xF8) != 0x10)
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return -2;
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/* check parity - endianness doesn't matter */
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if (hweight16(*(uint16_t *)lba) & 1)
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return -2;
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return (lba[1] >> 1) | ((lba[0] & 0x07) << 7);
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}
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/*
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* Read LBA associated with block
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* returns -1, if block is erased
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* returns -2 if error happens
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*/
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static int sm_read_lba(struct sm_oob *oob)
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{
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static const uint32_t erased_pattern[4] = {
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0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF };
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uint16_t lba_test;
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int lba;
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/* First test for erased block */
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if (!memcmp(oob, erased_pattern, SM_OOB_SIZE))
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return -1;
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/* Now check is both copies of the LBA differ too much */
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lba_test = *(uint16_t *)oob->lba_copy1 ^ *(uint16_t*)oob->lba_copy2;
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if (lba_test && !is_power_of_2(lba_test))
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return -2;
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/* And read it */
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lba = sm_get_lba(oob->lba_copy1);
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if (lba == -2)
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lba = sm_get_lba(oob->lba_copy2);
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return lba;
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}
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static void sm_write_lba(struct sm_oob *oob, uint16_t lba)
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{
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uint8_t tmp[2];
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WARN_ON(lba >= 1000);
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tmp[0] = 0x10 | ((lba >> 7) & 0x07);
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tmp[1] = (lba << 1) & 0xFF;
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if (hweight16(*(uint16_t *)tmp) & 0x01)
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tmp[1] |= 1;
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oob->lba_copy1[0] = oob->lba_copy2[0] = tmp[0];
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oob->lba_copy1[1] = oob->lba_copy2[1] = tmp[1];
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}
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/* Make offset from parts */
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static loff_t sm_mkoffset(struct sm_ftl *ftl, int zone, int block, int boffset)
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{
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WARN_ON(boffset & (SM_SECTOR_SIZE - 1));
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WARN_ON(zone < 0 || zone >= ftl->zone_count);
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WARN_ON(block >= ftl->zone_size);
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WARN_ON(boffset >= ftl->block_size);
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if (block == -1)
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return -1;
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return (zone * SM_MAX_ZONE_SIZE + block) * ftl->block_size + boffset;
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}
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/* Breaks offset into parts */
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static void sm_break_offset(struct sm_ftl *ftl, loff_t loffset,
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int *zone, int *block, int *boffset)
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{
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u64 offset = loffset;
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*boffset = do_div(offset, ftl->block_size);
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*block = do_div(offset, ftl->max_lba);
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*zone = offset >= ftl->zone_count ? -1 : offset;
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}
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/* ---------------------- low level IO ------------------------------------- */
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static int sm_correct_sector(uint8_t *buffer, struct sm_oob *oob)
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{
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bool sm_order = IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_HAMMING_SMC);
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uint8_t ecc[3];
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ecc_sw_hamming_calculate(buffer, SM_SMALL_PAGE, ecc, sm_order);
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if (ecc_sw_hamming_correct(buffer, ecc, oob->ecc1, SM_SMALL_PAGE,
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sm_order) < 0)
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return -EIO;
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buffer += SM_SMALL_PAGE;
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ecc_sw_hamming_calculate(buffer, SM_SMALL_PAGE, ecc, sm_order);
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if (ecc_sw_hamming_correct(buffer, ecc, oob->ecc2, SM_SMALL_PAGE,
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sm_order) < 0)
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return -EIO;
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return 0;
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}
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/* Reads a sector + oob*/
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static int sm_read_sector(struct sm_ftl *ftl,
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int zone, int block, int boffset,
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uint8_t *buffer, struct sm_oob *oob)
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{
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struct mtd_info *mtd = ftl->trans->mtd;
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struct mtd_oob_ops ops = { };
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struct sm_oob tmp_oob;
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int ret = -EIO;
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int try = 0;
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/* FTL can contain -1 entries that are by default filled with bits */
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if (block == -1) {
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if (buffer)
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memset(buffer, 0xFF, SM_SECTOR_SIZE);
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return 0;
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}
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/* User might not need the oob, but we do for data verification */
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if (!oob)
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oob = &tmp_oob;
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ops.mode = ftl->smallpagenand ? MTD_OPS_RAW : MTD_OPS_PLACE_OOB;
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ops.ooboffs = 0;
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ops.ooblen = SM_OOB_SIZE;
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ops.oobbuf = (void *)oob;
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ops.len = SM_SECTOR_SIZE;
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ops.datbuf = buffer;
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again:
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if (try++) {
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/* Avoid infinite recursion on CIS reads, sm_recheck_media
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* won't help anyway
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*/
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if (zone == 0 && block == ftl->cis_block && boffset ==
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ftl->cis_boffset)
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return ret;
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/* Test if media is stable */
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if (try == 3 || sm_recheck_media(ftl))
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return ret;
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}
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/* Unfortunately, oob read will _always_ succeed,
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* despite card removal.....
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*/
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ret = mtd_read_oob(mtd, sm_mkoffset(ftl, zone, block, boffset), &ops);
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/* Test for unknown errors */
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if (ret != 0 && !mtd_is_bitflip_or_eccerr(ret)) {
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dbg("read of block %d at zone %d, failed due to error (%d)",
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block, zone, ret);
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goto again;
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}
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/* Do a basic test on the oob, to guard against returned garbage */
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if (oob->reserved != 0xFFFFFFFF && !is_power_of_2(~oob->reserved))
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goto again;
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/* This should never happen, unless there is a bug in the mtd driver */
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WARN_ON(ops.oobretlen != SM_OOB_SIZE);
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WARN_ON(buffer && ops.retlen != SM_SECTOR_SIZE);
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if (!buffer)
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return 0;
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/* Test if sector marked as bad */
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if (!sm_sector_valid(oob)) {
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dbg("read of block %d at zone %d, failed because it is marked"
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" as bad" , block, zone);
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goto again;
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}
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/* Test ECC*/
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if (mtd_is_eccerr(ret) ||
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(ftl->smallpagenand && sm_correct_sector(buffer, oob))) {
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dbg("read of block %d at zone %d, failed due to ECC error",
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block, zone);
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goto again;
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}
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return 0;
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}
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/* Writes a sector to media */
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static int sm_write_sector(struct sm_ftl *ftl,
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int zone, int block, int boffset,
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uint8_t *buffer, struct sm_oob *oob)
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{
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struct mtd_oob_ops ops = { };
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struct mtd_info *mtd = ftl->trans->mtd;
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int ret;
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BUG_ON(ftl->readonly);
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if (zone == 0 && (block == ftl->cis_block || block == 0)) {
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dbg("attempted to write the CIS!");
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return -EIO;
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}
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if (ftl->unstable)
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return -EIO;
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ops.mode = ftl->smallpagenand ? MTD_OPS_RAW : MTD_OPS_PLACE_OOB;
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ops.len = SM_SECTOR_SIZE;
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ops.datbuf = buffer;
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ops.ooboffs = 0;
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ops.ooblen = SM_OOB_SIZE;
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ops.oobbuf = (void *)oob;
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ret = mtd_write_oob(mtd, sm_mkoffset(ftl, zone, block, boffset), &ops);
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/* Now we assume that hardware will catch write bitflip errors */
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if (ret) {
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dbg("write to block %d at zone %d, failed with error %d",
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block, zone, ret);
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sm_recheck_media(ftl);
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return ret;
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}
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/* This should never happen, unless there is a bug in the driver */
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WARN_ON(ops.oobretlen != SM_OOB_SIZE);
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WARN_ON(buffer && ops.retlen != SM_SECTOR_SIZE);
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return 0;
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}
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/* ------------------------ block IO ------------------------------------- */
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/* Write a block using data and lba, and invalid sector bitmap */
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static int sm_write_block(struct sm_ftl *ftl, uint8_t *buf,
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int zone, int block, int lba,
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unsigned long invalid_bitmap)
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{
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bool sm_order = IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_HAMMING_SMC);
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struct sm_oob oob;
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int boffset;
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int retry = 0;
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/* Initialize the oob with requested values */
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memset(&oob, 0xFF, SM_OOB_SIZE);
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sm_write_lba(&oob, lba);
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restart:
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if (ftl->unstable)
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return -EIO;
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for (boffset = 0; boffset < ftl->block_size;
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boffset += SM_SECTOR_SIZE) {
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oob.data_status = 0xFF;
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if (test_bit(boffset / SM_SECTOR_SIZE, &invalid_bitmap)) {
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sm_printk("sector %d of block at LBA %d of zone %d"
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" couldn't be read, marking it as invalid",
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boffset / SM_SECTOR_SIZE, lba, zone);
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oob.data_status = 0;
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}
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if (ftl->smallpagenand) {
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ecc_sw_hamming_calculate(buf + boffset,
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SM_SMALL_PAGE, oob.ecc1,
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sm_order);
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ecc_sw_hamming_calculate(buf + boffset + SM_SMALL_PAGE,
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SM_SMALL_PAGE, oob.ecc2,
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sm_order);
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}
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if (!sm_write_sector(ftl, zone, block, boffset,
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buf + boffset, &oob))
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continue;
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if (!retry) {
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/* If write fails. try to erase the block */
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/* This is safe, because we never write in blocks
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* that contain valuable data.
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* This is intended to repair block that are marked
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* as erased, but that isn't fully erased
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*/
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if (sm_erase_block(ftl, zone, block, 0))
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return -EIO;
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retry = 1;
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goto restart;
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} else {
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sm_mark_block_bad(ftl, zone, block);
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return -EIO;
|
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}
|
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}
|
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return 0;
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}
|
|
|
|
|
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/* Mark whole block at offset 'offs' as bad. */
|
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static void sm_mark_block_bad(struct sm_ftl *ftl, int zone, int block)
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{
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struct sm_oob oob;
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int boffset;
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|
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memset(&oob, 0xFF, SM_OOB_SIZE);
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oob.block_status = 0xF0;
|
|
|
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if (ftl->unstable)
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return;
|
|
|
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if (sm_recheck_media(ftl))
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return;
|
|
|
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sm_printk("marking block %d of zone %d as bad", block, zone);
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|
|
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/* We aren't checking the return value, because we don't care */
|
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/* This also fails on fake xD cards, but I guess these won't expose
|
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* any bad blocks till fail completely
|
|
*/
|
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for (boffset = 0; boffset < ftl->block_size; boffset += SM_SECTOR_SIZE)
|
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sm_write_sector(ftl, zone, block, boffset, NULL, &oob);
|
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}
|
|
|
|
/*
|
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* Erase a block within a zone
|
|
* If erase succeeds, it updates free block fifo, otherwise marks block as bad
|
|
*/
|
|
static int sm_erase_block(struct sm_ftl *ftl, int zone_num, uint16_t block,
|
|
int put_free)
|
|
{
|
|
struct ftl_zone *zone = &ftl->zones[zone_num];
|
|
struct mtd_info *mtd = ftl->trans->mtd;
|
|
struct erase_info erase;
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|
|
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erase.addr = sm_mkoffset(ftl, zone_num, block, 0);
|
|
erase.len = ftl->block_size;
|
|
|
|
if (ftl->unstable)
|
|
return -EIO;
|
|
|
|
BUG_ON(ftl->readonly);
|
|
|
|
if (zone_num == 0 && (block == ftl->cis_block || block == 0)) {
|
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sm_printk("attempted to erase the CIS!");
|
|
return -EIO;
|
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}
|
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|
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if (mtd_erase(mtd, &erase)) {
|
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sm_printk("erase of block %d in zone %d failed",
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block, zone_num);
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goto error;
|
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}
|
|
|
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if (put_free)
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kfifo_in(&zone->free_sectors,
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(const unsigned char *)&block, sizeof(block));
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|
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return 0;
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|
error:
|
|
sm_mark_block_bad(ftl, zone_num, block);
|
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return -EIO;
|
|
}
|
|
|
|
/* Thoroughly test that block is valid. */
|
|
static int sm_check_block(struct sm_ftl *ftl, int zone, int block)
|
|
{
|
|
int boffset;
|
|
struct sm_oob oob;
|
|
int lbas[] = { -3, 0, 0, 0 };
|
|
int i = 0;
|
|
int test_lba;
|
|
|
|
|
|
/* First just check that block doesn't look fishy */
|
|
/* Only blocks that are valid or are sliced in two parts, are
|
|
* accepted
|
|
*/
|
|
for (boffset = 0; boffset < ftl->block_size;
|
|
boffset += SM_SECTOR_SIZE) {
|
|
|
|
/* This shouldn't happen anyway */
|
|
if (sm_read_sector(ftl, zone, block, boffset, NULL, &oob))
|
|
return -2;
|
|
|
|
test_lba = sm_read_lba(&oob);
|
|
|
|
if (lbas[i] != test_lba)
|
|
lbas[++i] = test_lba;
|
|
|
|
/* If we found three different LBAs, something is fishy */
|
|
if (i == 3)
|
|
return -EIO;
|
|
}
|
|
|
|
/* If the block is sliced (partially erased usually) erase it */
|
|
if (i == 2) {
|
|
sm_erase_block(ftl, zone, block, 1);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* ----------------- media scanning --------------------------------- */
|
|
static const struct chs_entry chs_table[] = {
|
|
{ 1, 125, 4, 4 },
|
|
{ 2, 125, 4, 8 },
|
|
{ 4, 250, 4, 8 },
|
|
{ 8, 250, 4, 16 },
|
|
{ 16, 500, 4, 16 },
|
|
{ 32, 500, 8, 16 },
|
|
{ 64, 500, 8, 32 },
|
|
{ 128, 500, 16, 32 },
|
|
{ 256, 1000, 16, 32 },
|
|
{ 512, 1015, 32, 63 },
|
|
{ 1024, 985, 33, 63 },
|
|
{ 2048, 985, 33, 63 },
|
|
{ 0 },
|
|
};
|
|
|
|
|
|
static const uint8_t cis_signature[] = {
|
|
0x01, 0x03, 0xD9, 0x01, 0xFF, 0x18, 0x02, 0xDF, 0x01, 0x20
|
|
};
|
|
/* Find out media parameters.
|
|
* This ideally has to be based on nand id, but for now device size is enough
|
|
*/
|
|
static int sm_get_media_info(struct sm_ftl *ftl, struct mtd_info *mtd)
|
|
{
|
|
int i;
|
|
int size_in_megs = mtd->size / (1024 * 1024);
|
|
|
|
ftl->readonly = mtd->type == MTD_ROM;
|
|
|
|
/* Manual settings for very old devices */
|
|
ftl->zone_count = 1;
|
|
ftl->smallpagenand = 0;
|
|
|
|
switch (size_in_megs) {
|
|
case 1:
|
|
/* 1 MiB flash/rom SmartMedia card (256 byte pages)*/
|
|
ftl->zone_size = 256;
|
|
ftl->max_lba = 250;
|
|
ftl->block_size = 8 * SM_SECTOR_SIZE;
|
|
ftl->smallpagenand = 1;
|
|
|
|
break;
|
|
case 2:
|
|
/* 2 MiB flash SmartMedia (256 byte pages)*/
|
|
if (mtd->writesize == SM_SMALL_PAGE) {
|
|
ftl->zone_size = 512;
|
|
ftl->max_lba = 500;
|
|
ftl->block_size = 8 * SM_SECTOR_SIZE;
|
|
ftl->smallpagenand = 1;
|
|
/* 2 MiB rom SmartMedia */
|
|
} else {
|
|
|
|
if (!ftl->readonly)
|
|
return -ENODEV;
|
|
|
|
ftl->zone_size = 256;
|
|
ftl->max_lba = 250;
|
|
ftl->block_size = 16 * SM_SECTOR_SIZE;
|
|
}
|
|
break;
|
|
case 4:
|
|
/* 4 MiB flash/rom SmartMedia device */
|
|
ftl->zone_size = 512;
|
|
ftl->max_lba = 500;
|
|
ftl->block_size = 16 * SM_SECTOR_SIZE;
|
|
break;
|
|
case 8:
|
|
/* 8 MiB flash/rom SmartMedia device */
|
|
ftl->zone_size = 1024;
|
|
ftl->max_lba = 1000;
|
|
ftl->block_size = 16 * SM_SECTOR_SIZE;
|
|
}
|
|
|
|
/* Minimum xD size is 16MiB. Also, all xD cards have standard zone
|
|
* sizes. SmartMedia cards exist up to 128 MiB and have same layout
|
|
*/
|
|
if (size_in_megs >= 16) {
|
|
ftl->zone_count = size_in_megs / 16;
|
|
ftl->zone_size = 1024;
|
|
ftl->max_lba = 1000;
|
|
ftl->block_size = 32 * SM_SECTOR_SIZE;
|
|
}
|
|
|
|
/* Test for proper write,erase and oob sizes */
|
|
if (mtd->erasesize > ftl->block_size)
|
|
return -ENODEV;
|
|
|
|
if (mtd->writesize > SM_SECTOR_SIZE)
|
|
return -ENODEV;
|
|
|
|
if (ftl->smallpagenand && mtd->oobsize < SM_SMALL_OOB_SIZE)
|
|
return -ENODEV;
|
|
|
|
if (!ftl->smallpagenand && mtd->oobsize < SM_OOB_SIZE)
|
|
return -ENODEV;
|
|
|
|
/* We use OOB */
|
|
if (!mtd_has_oob(mtd))
|
|
return -ENODEV;
|
|
|
|
/* Find geometry information */
|
|
for (i = 0 ; i < ARRAY_SIZE(chs_table) ; i++) {
|
|
if (chs_table[i].size == size_in_megs) {
|
|
ftl->cylinders = chs_table[i].cyl;
|
|
ftl->heads = chs_table[i].head;
|
|
ftl->sectors = chs_table[i].sec;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
sm_printk("media has unknown size : %dMiB", size_in_megs);
|
|
ftl->cylinders = 985;
|
|
ftl->heads = 33;
|
|
ftl->sectors = 63;
|
|
return 0;
|
|
}
|
|
|
|
/* Validate the CIS */
|
|
static int sm_read_cis(struct sm_ftl *ftl)
|
|
{
|
|
struct sm_oob oob;
|
|
|
|
if (sm_read_sector(ftl,
|
|
0, ftl->cis_block, ftl->cis_boffset, ftl->cis_buffer, &oob))
|
|
return -EIO;
|
|
|
|
if (!sm_sector_valid(&oob) || !sm_block_valid(&oob))
|
|
return -EIO;
|
|
|
|
if (!memcmp(ftl->cis_buffer + ftl->cis_page_offset,
|
|
cis_signature, sizeof(cis_signature))) {
|
|
return 0;
|
|
}
|
|
|
|
return -EIO;
|
|
}
|
|
|
|
/* Scan the media for the CIS */
|
|
static int sm_find_cis(struct sm_ftl *ftl)
|
|
{
|
|
struct sm_oob oob;
|
|
int block, boffset;
|
|
int block_found = 0;
|
|
int cis_found = 0;
|
|
|
|
/* Search for first valid block */
|
|
for (block = 0 ; block < ftl->zone_size - ftl->max_lba ; block++) {
|
|
|
|
if (sm_read_sector(ftl, 0, block, 0, NULL, &oob))
|
|
continue;
|
|
|
|
if (!sm_block_valid(&oob))
|
|
continue;
|
|
block_found = 1;
|
|
break;
|
|
}
|
|
|
|
if (!block_found)
|
|
return -EIO;
|
|
|
|
/* Search for first valid sector in this block */
|
|
for (boffset = 0 ; boffset < ftl->block_size;
|
|
boffset += SM_SECTOR_SIZE) {
|
|
|
|
if (sm_read_sector(ftl, 0, block, boffset, NULL, &oob))
|
|
continue;
|
|
|
|
if (!sm_sector_valid(&oob))
|
|
continue;
|
|
break;
|
|
}
|
|
|
|
if (boffset == ftl->block_size)
|
|
return -EIO;
|
|
|
|
ftl->cis_block = block;
|
|
ftl->cis_boffset = boffset;
|
|
ftl->cis_page_offset = 0;
|
|
|
|
cis_found = !sm_read_cis(ftl);
|
|
|
|
if (!cis_found) {
|
|
ftl->cis_page_offset = SM_SMALL_PAGE;
|
|
cis_found = !sm_read_cis(ftl);
|
|
}
|
|
|
|
if (cis_found) {
|
|
dbg("CIS block found at offset %x",
|
|
block * ftl->block_size +
|
|
boffset + ftl->cis_page_offset);
|
|
return 0;
|
|
}
|
|
return -EIO;
|
|
}
|
|
|
|
/* Basic test to determine if underlying mtd device if functional */
|
|
static int sm_recheck_media(struct sm_ftl *ftl)
|
|
{
|
|
if (sm_read_cis(ftl)) {
|
|
|
|
if (!ftl->unstable) {
|
|
sm_printk("media unstable, not allowing writes");
|
|
ftl->unstable = 1;
|
|
}
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Initialize a FTL zone */
|
|
static int sm_init_zone(struct sm_ftl *ftl, int zone_num)
|
|
{
|
|
struct ftl_zone *zone = &ftl->zones[zone_num];
|
|
struct sm_oob oob;
|
|
uint16_t block;
|
|
int lba;
|
|
int i = 0;
|
|
int len;
|
|
|
|
dbg("initializing zone %d", zone_num);
|
|
|
|
/* Allocate memory for FTL table */
|
|
zone->lba_to_phys_table = kmalloc_array(ftl->max_lba, 2, GFP_KERNEL);
|
|
|
|
if (!zone->lba_to_phys_table)
|
|
return -ENOMEM;
|
|
memset(zone->lba_to_phys_table, -1, ftl->max_lba * 2);
|
|
|
|
|
|
/* Allocate memory for free sectors FIFO */
|
|
if (kfifo_alloc(&zone->free_sectors, ftl->zone_size * 2, GFP_KERNEL)) {
|
|
kfree(zone->lba_to_phys_table);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Now scan the zone */
|
|
for (block = 0 ; block < ftl->zone_size ; block++) {
|
|
|
|
/* Skip blocks till the CIS (including) */
|
|
if (zone_num == 0 && block <= ftl->cis_block)
|
|
continue;
|
|
|
|
/* Read the oob of first sector */
|
|
if (sm_read_sector(ftl, zone_num, block, 0, NULL, &oob)) {
|
|
kfifo_free(&zone->free_sectors);
|
|
kfree(zone->lba_to_phys_table);
|
|
return -EIO;
|
|
}
|
|
|
|
/* Test to see if block is erased. It is enough to test
|
|
* first sector, because erase happens in one shot
|
|
*/
|
|
if (sm_block_erased(&oob)) {
|
|
kfifo_in(&zone->free_sectors,
|
|
(unsigned char *)&block, 2);
|
|
continue;
|
|
}
|
|
|
|
/* If block is marked as bad, skip it */
|
|
/* This assumes we can trust first sector*/
|
|
/* However the way the block valid status is defined, ensures
|
|
* very low probability of failure here
|
|
*/
|
|
if (!sm_block_valid(&oob)) {
|
|
dbg("PH %04d <-> <marked bad>", block);
|
|
continue;
|
|
}
|
|
|
|
|
|
lba = sm_read_lba(&oob);
|
|
|
|
/* Invalid LBA means that block is damaged. */
|
|
/* We can try to erase it, or mark it as bad, but
|
|
* lets leave that to recovery application
|
|
*/
|
|
if (lba == -2 || lba >= ftl->max_lba) {
|
|
dbg("PH %04d <-> LBA %04d(bad)", block, lba);
|
|
continue;
|
|
}
|
|
|
|
|
|
/* If there is no collision,
|
|
* just put the sector in the FTL table
|
|
*/
|
|
if (zone->lba_to_phys_table[lba] < 0) {
|
|
dbg_verbose("PH %04d <-> LBA %04d", block, lba);
|
|
zone->lba_to_phys_table[lba] = block;
|
|
continue;
|
|
}
|
|
|
|
sm_printk("collision"
|
|
" of LBA %d between blocks %d and %d in zone %d",
|
|
lba, zone->lba_to_phys_table[lba], block, zone_num);
|
|
|
|
/* Test that this block is valid*/
|
|
if (sm_check_block(ftl, zone_num, block))
|
|
continue;
|
|
|
|
/* Test now the old block */
|
|
if (sm_check_block(ftl, zone_num,
|
|
zone->lba_to_phys_table[lba])) {
|
|
zone->lba_to_phys_table[lba] = block;
|
|
continue;
|
|
}
|
|
|
|
/* If both blocks are valid and share same LBA, it means that
|
|
* they hold different versions of same data. It not
|
|
* known which is more recent, thus just erase one of them
|
|
*/
|
|
sm_printk("both blocks are valid, erasing the later");
|
|
sm_erase_block(ftl, zone_num, block, 1);
|
|
}
|
|
|
|
dbg("zone initialized");
|
|
zone->initialized = 1;
|
|
|
|
/* No free sectors, means that the zone is heavily damaged, write won't
|
|
* work, but it can still can be (partially) read
|
|
*/
|
|
if (!kfifo_len(&zone->free_sectors)) {
|
|
sm_printk("no free blocks in zone %d", zone_num);
|
|
return 0;
|
|
}
|
|
|
|
/* Randomize first block we write to */
|
|
get_random_bytes(&i, 2);
|
|
i %= (kfifo_len(&zone->free_sectors) / 2);
|
|
|
|
while (i--) {
|
|
len = kfifo_out(&zone->free_sectors,
|
|
(unsigned char *)&block, 2);
|
|
WARN_ON(len != 2);
|
|
kfifo_in(&zone->free_sectors, (const unsigned char *)&block, 2);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Get and automatically initialize an FTL mapping for one zone */
|
|
static struct ftl_zone *sm_get_zone(struct sm_ftl *ftl, int zone_num)
|
|
{
|
|
struct ftl_zone *zone;
|
|
int error;
|
|
|
|
BUG_ON(zone_num >= ftl->zone_count);
|
|
zone = &ftl->zones[zone_num];
|
|
|
|
if (!zone->initialized) {
|
|
error = sm_init_zone(ftl, zone_num);
|
|
|
|
if (error)
|
|
return ERR_PTR(error);
|
|
}
|
|
return zone;
|
|
}
|
|
|
|
|
|
/* ----------------- cache handling ------------------------------------------*/
|
|
|
|
/* Initialize the one block cache */
|
|
static void sm_cache_init(struct sm_ftl *ftl)
|
|
{
|
|
ftl->cache_data_invalid_bitmap = 0xFFFFFFFF;
|
|
ftl->cache_clean = 1;
|
|
ftl->cache_zone = -1;
|
|
ftl->cache_block = -1;
|
|
/*memset(ftl->cache_data, 0xAA, ftl->block_size);*/
|
|
}
|
|
|
|
/* Put sector in one block cache */
|
|
static void sm_cache_put(struct sm_ftl *ftl, char *buffer, int boffset)
|
|
{
|
|
memcpy(ftl->cache_data + boffset, buffer, SM_SECTOR_SIZE);
|
|
clear_bit(boffset / SM_SECTOR_SIZE, &ftl->cache_data_invalid_bitmap);
|
|
ftl->cache_clean = 0;
|
|
}
|
|
|
|
/* Read a sector from the cache */
|
|
static int sm_cache_get(struct sm_ftl *ftl, char *buffer, int boffset)
|
|
{
|
|
if (test_bit(boffset / SM_SECTOR_SIZE,
|
|
&ftl->cache_data_invalid_bitmap))
|
|
return -1;
|
|
|
|
memcpy(buffer, ftl->cache_data + boffset, SM_SECTOR_SIZE);
|
|
return 0;
|
|
}
|
|
|
|
/* Write the cache to hardware */
|
|
static int sm_cache_flush(struct sm_ftl *ftl)
|
|
{
|
|
struct ftl_zone *zone;
|
|
|
|
int sector_num;
|
|
uint16_t write_sector;
|
|
int zone_num = ftl->cache_zone;
|
|
int block_num;
|
|
|
|
if (ftl->cache_clean)
|
|
return 0;
|
|
|
|
if (ftl->unstable)
|
|
return -EIO;
|
|
|
|
BUG_ON(zone_num < 0);
|
|
zone = &ftl->zones[zone_num];
|
|
block_num = zone->lba_to_phys_table[ftl->cache_block];
|
|
|
|
|
|
/* Try to read all unread areas of the cache block*/
|
|
for_each_set_bit(sector_num, &ftl->cache_data_invalid_bitmap,
|
|
ftl->block_size / SM_SECTOR_SIZE) {
|
|
|
|
if (!sm_read_sector(ftl,
|
|
zone_num, block_num, sector_num * SM_SECTOR_SIZE,
|
|
ftl->cache_data + sector_num * SM_SECTOR_SIZE, NULL))
|
|
clear_bit(sector_num,
|
|
&ftl->cache_data_invalid_bitmap);
|
|
}
|
|
restart:
|
|
|
|
if (ftl->unstable)
|
|
return -EIO;
|
|
|
|
/* If there are no spare blocks, */
|
|
/* we could still continue by erasing/writing the current block,
|
|
* but for such worn out media it doesn't worth the trouble,
|
|
* and the dangers
|
|
*/
|
|
if (kfifo_out(&zone->free_sectors,
|
|
(unsigned char *)&write_sector, 2) != 2) {
|
|
dbg("no free sectors for write!");
|
|
return -EIO;
|
|
}
|
|
|
|
|
|
if (sm_write_block(ftl, ftl->cache_data, zone_num, write_sector,
|
|
ftl->cache_block, ftl->cache_data_invalid_bitmap))
|
|
goto restart;
|
|
|
|
/* Update the FTL table */
|
|
zone->lba_to_phys_table[ftl->cache_block] = write_sector;
|
|
|
|
/* Write succesfull, so erase and free the old block */
|
|
if (block_num > 0)
|
|
sm_erase_block(ftl, zone_num, block_num, 1);
|
|
|
|
sm_cache_init(ftl);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* flush timer, runs a second after last write */
|
|
static void sm_cache_flush_timer(struct timer_list *t)
|
|
{
|
|
struct sm_ftl *ftl = from_timer(ftl, t, timer);
|
|
queue_work(cache_flush_workqueue, &ftl->flush_work);
|
|
}
|
|
|
|
/* cache flush work, kicked by timer */
|
|
static void sm_cache_flush_work(struct work_struct *work)
|
|
{
|
|
struct sm_ftl *ftl = container_of(work, struct sm_ftl, flush_work);
|
|
mutex_lock(&ftl->mutex);
|
|
sm_cache_flush(ftl);
|
|
mutex_unlock(&ftl->mutex);
|
|
return;
|
|
}
|
|
|
|
/* ---------------- outside interface -------------------------------------- */
|
|
|
|
/* outside interface: read a sector */
|
|
static int sm_read(struct mtd_blktrans_dev *dev,
|
|
unsigned long sect_no, char *buf)
|
|
{
|
|
struct sm_ftl *ftl = dev->priv;
|
|
struct ftl_zone *zone;
|
|
int error = 0, in_cache = 0;
|
|
int zone_num, block, boffset;
|
|
|
|
sm_break_offset(ftl, sect_no << 9, &zone_num, &block, &boffset);
|
|
mutex_lock(&ftl->mutex);
|
|
|
|
|
|
zone = sm_get_zone(ftl, zone_num);
|
|
if (IS_ERR(zone)) {
|
|
error = PTR_ERR(zone);
|
|
goto unlock;
|
|
}
|
|
|
|
/* Have to look at cache first */
|
|
if (ftl->cache_zone == zone_num && ftl->cache_block == block) {
|
|
in_cache = 1;
|
|
if (!sm_cache_get(ftl, buf, boffset))
|
|
goto unlock;
|
|
}
|
|
|
|
/* Translate the block and return if doesn't exist in the table */
|
|
block = zone->lba_to_phys_table[block];
|
|
|
|
if (block == -1) {
|
|
memset(buf, 0xFF, SM_SECTOR_SIZE);
|
|
goto unlock;
|
|
}
|
|
|
|
if (sm_read_sector(ftl, zone_num, block, boffset, buf, NULL)) {
|
|
error = -EIO;
|
|
goto unlock;
|
|
}
|
|
|
|
if (in_cache)
|
|
sm_cache_put(ftl, buf, boffset);
|
|
unlock:
|
|
mutex_unlock(&ftl->mutex);
|
|
return error;
|
|
}
|
|
|
|
/* outside interface: write a sector */
|
|
static int sm_write(struct mtd_blktrans_dev *dev,
|
|
unsigned long sec_no, char *buf)
|
|
{
|
|
struct sm_ftl *ftl = dev->priv;
|
|
struct ftl_zone *zone;
|
|
int error = 0, zone_num, block, boffset;
|
|
|
|
BUG_ON(ftl->readonly);
|
|
sm_break_offset(ftl, sec_no << 9, &zone_num, &block, &boffset);
|
|
|
|
/* No need in flush thread running now */
|
|
del_timer(&ftl->timer);
|
|
mutex_lock(&ftl->mutex);
|
|
|
|
zone = sm_get_zone(ftl, zone_num);
|
|
if (IS_ERR(zone)) {
|
|
error = PTR_ERR(zone);
|
|
goto unlock;
|
|
}
|
|
|
|
/* If entry is not in cache, flush it */
|
|
if (ftl->cache_block != block || ftl->cache_zone != zone_num) {
|
|
|
|
error = sm_cache_flush(ftl);
|
|
if (error)
|
|
goto unlock;
|
|
|
|
ftl->cache_block = block;
|
|
ftl->cache_zone = zone_num;
|
|
}
|
|
|
|
sm_cache_put(ftl, buf, boffset);
|
|
unlock:
|
|
mod_timer(&ftl->timer, jiffies + msecs_to_jiffies(cache_timeout));
|
|
mutex_unlock(&ftl->mutex);
|
|
return error;
|
|
}
|
|
|
|
/* outside interface: flush everything */
|
|
static int sm_flush(struct mtd_blktrans_dev *dev)
|
|
{
|
|
struct sm_ftl *ftl = dev->priv;
|
|
int retval;
|
|
|
|
mutex_lock(&ftl->mutex);
|
|
retval = sm_cache_flush(ftl);
|
|
mutex_unlock(&ftl->mutex);
|
|
return retval;
|
|
}
|
|
|
|
/* outside interface: device is released */
|
|
static void sm_release(struct mtd_blktrans_dev *dev)
|
|
{
|
|
struct sm_ftl *ftl = dev->priv;
|
|
|
|
del_timer_sync(&ftl->timer);
|
|
cancel_work_sync(&ftl->flush_work);
|
|
mutex_lock(&ftl->mutex);
|
|
sm_cache_flush(ftl);
|
|
mutex_unlock(&ftl->mutex);
|
|
}
|
|
|
|
/* outside interface: get geometry */
|
|
static int sm_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo)
|
|
{
|
|
struct sm_ftl *ftl = dev->priv;
|
|
geo->heads = ftl->heads;
|
|
geo->sectors = ftl->sectors;
|
|
geo->cylinders = ftl->cylinders;
|
|
return 0;
|
|
}
|
|
|
|
/* external interface: main initialization function */
|
|
static void sm_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
|
|
{
|
|
struct mtd_blktrans_dev *trans;
|
|
struct sm_ftl *ftl;
|
|
|
|
/* Allocate & initialize our private structure */
|
|
ftl = kzalloc(sizeof(struct sm_ftl), GFP_KERNEL);
|
|
if (!ftl)
|
|
goto error1;
|
|
|
|
|
|
mutex_init(&ftl->mutex);
|
|
timer_setup(&ftl->timer, sm_cache_flush_timer, 0);
|
|
INIT_WORK(&ftl->flush_work, sm_cache_flush_work);
|
|
|
|
/* Read media information */
|
|
if (sm_get_media_info(ftl, mtd)) {
|
|
dbg("found unsupported mtd device, aborting");
|
|
goto error2;
|
|
}
|
|
|
|
|
|
/* Allocate temporary CIS buffer for read retry support */
|
|
ftl->cis_buffer = kzalloc(SM_SECTOR_SIZE, GFP_KERNEL);
|
|
if (!ftl->cis_buffer)
|
|
goto error2;
|
|
|
|
/* Allocate zone array, it will be initialized on demand */
|
|
ftl->zones = kcalloc(ftl->zone_count, sizeof(struct ftl_zone),
|
|
GFP_KERNEL);
|
|
if (!ftl->zones)
|
|
goto error3;
|
|
|
|
/* Allocate the cache*/
|
|
ftl->cache_data = kzalloc(ftl->block_size, GFP_KERNEL);
|
|
|
|
if (!ftl->cache_data)
|
|
goto error4;
|
|
|
|
sm_cache_init(ftl);
|
|
|
|
|
|
/* Allocate upper layer structure and initialize it */
|
|
trans = kzalloc(sizeof(struct mtd_blktrans_dev), GFP_KERNEL);
|
|
if (!trans)
|
|
goto error5;
|
|
|
|
ftl->trans = trans;
|
|
trans->priv = ftl;
|
|
|
|
trans->tr = tr;
|
|
trans->mtd = mtd;
|
|
trans->devnum = -1;
|
|
trans->size = (ftl->block_size * ftl->max_lba * ftl->zone_count) >> 9;
|
|
trans->readonly = ftl->readonly;
|
|
|
|
if (sm_find_cis(ftl)) {
|
|
dbg("CIS not found on mtd device, aborting");
|
|
goto error6;
|
|
}
|
|
|
|
ftl->disk_attributes = sm_create_sysfs_attributes(ftl);
|
|
if (!ftl->disk_attributes)
|
|
goto error6;
|
|
trans->disk_attributes = ftl->disk_attributes;
|
|
|
|
sm_printk("Found %d MiB xD/SmartMedia FTL on mtd%d",
|
|
(int)(mtd->size / (1024 * 1024)), mtd->index);
|
|
|
|
dbg("FTL layout:");
|
|
dbg("%d zone(s), each consists of %d blocks (+%d spares)",
|
|
ftl->zone_count, ftl->max_lba,
|
|
ftl->zone_size - ftl->max_lba);
|
|
dbg("each block consists of %d bytes",
|
|
ftl->block_size);
|
|
|
|
|
|
/* Register device*/
|
|
if (add_mtd_blktrans_dev(trans)) {
|
|
dbg("error in mtdblktrans layer");
|
|
goto error6;
|
|
}
|
|
return;
|
|
error6:
|
|
kfree(trans);
|
|
error5:
|
|
kfree(ftl->cache_data);
|
|
error4:
|
|
kfree(ftl->zones);
|
|
error3:
|
|
kfree(ftl->cis_buffer);
|
|
error2:
|
|
kfree(ftl);
|
|
error1:
|
|
return;
|
|
}
|
|
|
|
/* main interface: device {surprise,} removal */
|
|
static void sm_remove_dev(struct mtd_blktrans_dev *dev)
|
|
{
|
|
struct sm_ftl *ftl = dev->priv;
|
|
int i;
|
|
|
|
del_mtd_blktrans_dev(dev);
|
|
ftl->trans = NULL;
|
|
|
|
for (i = 0 ; i < ftl->zone_count; i++) {
|
|
|
|
if (!ftl->zones[i].initialized)
|
|
continue;
|
|
|
|
kfree(ftl->zones[i].lba_to_phys_table);
|
|
kfifo_free(&ftl->zones[i].free_sectors);
|
|
}
|
|
|
|
sm_delete_sysfs_attributes(ftl);
|
|
kfree(ftl->cis_buffer);
|
|
kfree(ftl->zones);
|
|
kfree(ftl->cache_data);
|
|
kfree(ftl);
|
|
}
|
|
|
|
static struct mtd_blktrans_ops sm_ftl_ops = {
|
|
.name = "smblk",
|
|
.major = 0,
|
|
.part_bits = SM_FTL_PARTN_BITS,
|
|
.blksize = SM_SECTOR_SIZE,
|
|
.getgeo = sm_getgeo,
|
|
|
|
.add_mtd = sm_add_mtd,
|
|
.remove_dev = sm_remove_dev,
|
|
|
|
.readsect = sm_read,
|
|
.writesect = sm_write,
|
|
|
|
.flush = sm_flush,
|
|
.release = sm_release,
|
|
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static __init int sm_module_init(void)
|
|
{
|
|
int error = 0;
|
|
|
|
cache_flush_workqueue = create_freezable_workqueue("smflush");
|
|
if (!cache_flush_workqueue)
|
|
return -ENOMEM;
|
|
|
|
error = register_mtd_blktrans(&sm_ftl_ops);
|
|
if (error)
|
|
destroy_workqueue(cache_flush_workqueue);
|
|
return error;
|
|
|
|
}
|
|
|
|
static void __exit sm_module_exit(void)
|
|
{
|
|
destroy_workqueue(cache_flush_workqueue);
|
|
deregister_mtd_blktrans(&sm_ftl_ops);
|
|
}
|
|
|
|
module_init(sm_module_init);
|
|
module_exit(sm_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
|
|
MODULE_DESCRIPTION("Smartmedia/xD mtd translation layer");
|