mtd: nand: ecc-bch: Create the software BCH engine
Let's continue introducing the generic ECC engine abstraction in the NAND subsystem by instantiating a first ECC engine: the software BCH one. While at it, make a very tidy ecc_sw_bch_init() function and move all the sanity checks and user input management in nand_ecc_sw_bch_init_ctx(). This second helper will be called from the raw RAND core. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20200929230124.31491-10-miquel.raynal@bootlin.com
This commit is contained in:
Miquel Raynal
parent
80fe603160
commit
9994bb3f36
@ -75,6 +75,19 @@ int nand_ecc_sw_bch_correct(struct nand_device *nand, unsigned char *buf,
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}
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EXPORT_SYMBOL(nand_ecc_sw_bch_correct);
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/**
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* nand_ecc_sw_bch_cleanup - Cleanup software BCH ECC resources
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* @nand: NAND device
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*/
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static void nand_ecc_sw_bch_cleanup(struct nand_device *nand)
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{
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struct nand_ecc_sw_bch_conf *engine_conf = nand->ecc.ctx.priv;
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bch_free(engine_conf->bch);
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kfree(engine_conf->errloc);
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kfree(engine_conf->eccmask);
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}
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/**
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* nand_ecc_sw_bch_init - Initialize software BCH ECC engine
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* @nand: NAND device
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@ -92,71 +105,36 @@ EXPORT_SYMBOL(nand_ecc_sw_bch_correct);
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* step_size = 512 (thus, m = 13 is the smallest integer such that 2^m - 1 > 512 * 8)
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* bytes = 7 (7 bytes are required to store m * t = 13 * 4 = 52 bits)
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*/
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int nand_ecc_sw_bch_init(struct nand_device *nand)
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static int nand_ecc_sw_bch_init(struct nand_device *nand)
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{
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struct mtd_info *mtd = nanddev_to_mtd(nand);
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unsigned int m, t, eccsteps, i;
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struct nand_ecc_sw_bch_conf *engine_conf = nand->ecc.ctx.priv;
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unsigned char *erased_page;
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unsigned int eccsize = nand->ecc.ctx.conf.step_size;
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unsigned int eccbytes = engine_conf->code_size;
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unsigned int eccstrength = nand->ecc.ctx.conf.strength;
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unsigned int m, t, i;
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unsigned char *erased_page;
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int ret;
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if (!eccbytes && eccstrength) {
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eccbytes = DIV_ROUND_UP(eccstrength * fls(8 * eccsize), 8);
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engine_conf->code_size = eccbytes;
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}
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if (!eccsize || !eccbytes) {
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pr_warn("ecc parameters not supplied\n");
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return -EINVAL;
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}
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m = fls(1+8*eccsize);
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t = (eccbytes*8)/m;
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m = fls(1 + (8 * eccsize));
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t = (eccbytes * 8) / m;
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engine_conf->bch = bch_init(m, t, 0, false);
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if (!engine_conf->bch)
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return -EINVAL;
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/* verify that eccbytes has the expected value */
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if (engine_conf->bch->ecc_bytes != eccbytes) {
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pr_warn("invalid eccbytes %u, should be %u\n",
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eccbytes, engine_conf->bch->ecc_bytes);
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goto fail;
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}
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eccsteps = mtd->writesize/eccsize;
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/* Check that we have an oob layout description. */
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if (!mtd->ooblayout) {
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pr_warn("missing oob scheme");
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goto fail;
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}
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/* sanity checks */
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if (8*(eccsize+eccbytes) >= (1 << m)) {
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pr_warn("eccsize %u is too large\n", eccsize);
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goto fail;
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}
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if (mtd_ooblayout_count_eccbytes(mtd) != (eccsteps*eccbytes)) {
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pr_warn("invalid ecc layout\n");
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goto fail;
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}
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engine_conf->eccmask = kzalloc(eccbytes, GFP_KERNEL);
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engine_conf->errloc = kmalloc_array(t, sizeof(*engine_conf->errloc),
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GFP_KERNEL);
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if (!engine_conf->eccmask || !engine_conf->errloc)
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goto fail;
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if (!engine_conf->eccmask || !engine_conf->errloc) {
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ret = -ENOMEM;
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goto cleanup;
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}
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/*
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* compute and store the inverted ecc of an erased ecc block
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*/
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/* Compute and store the inverted ECC of an erased step */
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erased_page = kmalloc(eccsize, GFP_KERNEL);
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if (!erased_page)
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goto fail;
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if (!erased_page) {
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ret = -ENOMEM;
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goto cleanup;
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}
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memset(erased_page, 0xff, eccsize);
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bch_encode(engine_conf->bch, erased_page, eccsize,
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@ -166,33 +144,262 @@ int nand_ecc_sw_bch_init(struct nand_device *nand)
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for (i = 0; i < eccbytes; i++)
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engine_conf->eccmask[i] ^= 0xff;
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if (!eccstrength)
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nand->ecc.ctx.conf.strength = (eccbytes * 8) / fls(8 * eccsize);
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/* Verify that the number of code bytes has the expected value */
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if (engine_conf->bch->ecc_bytes != eccbytes) {
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pr_err("Invalid number of ECC bytes: %u, expected: %u\n",
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eccbytes, engine_conf->bch->ecc_bytes);
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ret = -EINVAL;
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goto cleanup;
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}
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/* Sanity checks */
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if (8 * (eccsize + eccbytes) >= (1 << m)) {
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pr_err("ECC step size is too large (%u)\n", eccsize);
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ret = -EINVAL;
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goto cleanup;
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}
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return 0;
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fail:
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cleanup:
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nand_ecc_sw_bch_cleanup(nand);
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return -EINVAL;
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return ret;
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}
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EXPORT_SYMBOL(nand_ecc_sw_bch_init);
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/**
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* nand_ecc_sw_bch_cleanup - Cleanup software BCH ECC resources
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* @nand: NAND device
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*/
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void nand_ecc_sw_bch_cleanup(struct nand_device *nand)
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int nand_ecc_sw_bch_init_ctx(struct nand_device *nand)
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{
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struct nand_ecc_props *conf = &nand->ecc.ctx.conf;
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struct mtd_info *mtd = nanddev_to_mtd(nand);
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struct nand_ecc_sw_bch_conf *engine_conf;
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unsigned int code_size = 0, nsteps;
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int ret;
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/* Only large page NAND chips may use BCH */
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if (mtd->oobsize < 64) {
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pr_err("BCH cannot be used with small page NAND chips\n");
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return -EINVAL;
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}
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if (!mtd->ooblayout)
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mtd_set_ooblayout(mtd, nand_get_large_page_ooblayout());
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conf->engine_type = NAND_ECC_ENGINE_TYPE_SOFT;
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conf->algo = NAND_ECC_ALGO_BCH;
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conf->step_size = nand->ecc.user_conf.step_size;
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conf->strength = nand->ecc.user_conf.strength;
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/*
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* Board driver should supply ECC size and ECC strength
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* values to select how many bits are correctable.
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* Otherwise, default to 512 bytes for large page devices and 256 for
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* small page devices.
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*/
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if (!conf->step_size) {
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if (mtd->oobsize >= 64)
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conf->step_size = 512;
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else
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conf->step_size = 256;
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conf->strength = 4;
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}
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nsteps = mtd->writesize / conf->step_size;
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/* Maximize */
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if (nand->ecc.user_conf.flags & NAND_ECC_MAXIMIZE_STRENGTH) {
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conf->step_size = 1024;
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nsteps = mtd->writesize / conf->step_size;
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/* Reserve 2 bytes for the BBM */
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code_size = (mtd->oobsize - 2) / nsteps;
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conf->strength = code_size * 8 / fls(8 * conf->step_size);
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}
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if (!code_size)
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code_size = DIV_ROUND_UP(conf->strength *
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fls(8 * conf->step_size), 8);
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if (!conf->strength)
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conf->strength = (code_size * 8) / fls(8 * conf->step_size);
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if (!code_size && !conf->strength) {
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pr_err("Missing ECC parameters\n");
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return -EINVAL;
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}
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engine_conf = kzalloc(sizeof(*engine_conf), GFP_KERNEL);
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if (!engine_conf)
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return -ENOMEM;
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ret = nand_ecc_init_req_tweaking(&engine_conf->req_ctx, nand);
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if (ret)
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goto free_engine_conf;
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engine_conf->code_size = code_size;
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engine_conf->nsteps = nsteps;
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engine_conf->calc_buf = kzalloc(mtd->oobsize, GFP_KERNEL);
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engine_conf->code_buf = kzalloc(mtd->oobsize, GFP_KERNEL);
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if (!engine_conf->calc_buf || !engine_conf->code_buf) {
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ret = -ENOMEM;
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goto free_bufs;
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}
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nand->ecc.ctx.priv = engine_conf;
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nand->ecc.ctx.total = nsteps * code_size;
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ret = nand_ecc_sw_bch_init(nand);
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if (ret)
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goto free_bufs;
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/* Verify the layout validity */
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if (mtd_ooblayout_count_eccbytes(mtd) !=
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engine_conf->nsteps * engine_conf->code_size) {
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pr_err("Invalid ECC layout\n");
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ret = -EINVAL;
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goto cleanup_bch_ctx;
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}
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return 0;
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cleanup_bch_ctx:
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nand_ecc_sw_bch_cleanup(nand);
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free_bufs:
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nand_ecc_cleanup_req_tweaking(&engine_conf->req_ctx);
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kfree(engine_conf->calc_buf);
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kfree(engine_conf->code_buf);
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free_engine_conf:
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kfree(engine_conf);
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return ret;
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}
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EXPORT_SYMBOL(nand_ecc_sw_bch_init_ctx);
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void nand_ecc_sw_bch_cleanup_ctx(struct nand_device *nand)
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{
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struct nand_ecc_sw_bch_conf *engine_conf = nand->ecc.ctx.priv;
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if (engine_conf) {
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bch_free(engine_conf->bch);
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kfree(engine_conf->errloc);
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kfree(engine_conf->eccmask);
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nand_ecc_sw_bch_cleanup(nand);
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nand_ecc_cleanup_req_tweaking(&engine_conf->req_ctx);
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kfree(engine_conf->calc_buf);
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kfree(engine_conf->code_buf);
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kfree(engine_conf);
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}
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}
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EXPORT_SYMBOL(nand_ecc_sw_bch_cleanup);
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EXPORT_SYMBOL(nand_ecc_sw_bch_cleanup_ctx);
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static int nand_ecc_sw_bch_prepare_io_req(struct nand_device *nand,
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struct nand_page_io_req *req)
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{
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struct nand_ecc_sw_bch_conf *engine_conf = nand->ecc.ctx.priv;
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struct mtd_info *mtd = nanddev_to_mtd(nand);
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int eccsize = nand->ecc.ctx.conf.step_size;
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int eccbytes = engine_conf->code_size;
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int eccsteps = engine_conf->nsteps;
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int total = nand->ecc.ctx.total;
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u8 *ecccalc = engine_conf->calc_buf;
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const u8 *data;
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int i;
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/* Nothing to do for a raw operation */
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if (req->mode == MTD_OPS_RAW)
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return 0;
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/* This engine does not provide BBM/free OOB bytes protection */
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if (!req->datalen)
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return 0;
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nand_ecc_tweak_req(&engine_conf->req_ctx, req);
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/* No more preparation for page read */
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if (req->type == NAND_PAGE_READ)
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return 0;
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/* Preparation for page write: derive the ECC bytes and place them */
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for (i = 0, data = req->databuf.out;
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eccsteps;
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eccsteps--, i += eccbytes, data += eccsize)
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nand_ecc_sw_bch_calculate(nand, data, &ecccalc[i]);
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return mtd_ooblayout_set_eccbytes(mtd, ecccalc, (void *)req->oobbuf.out,
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0, total);
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}
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static int nand_ecc_sw_bch_finish_io_req(struct nand_device *nand,
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struct nand_page_io_req *req)
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{
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struct nand_ecc_sw_bch_conf *engine_conf = nand->ecc.ctx.priv;
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struct mtd_info *mtd = nanddev_to_mtd(nand);
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int eccsize = nand->ecc.ctx.conf.step_size;
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int total = nand->ecc.ctx.total;
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int eccbytes = engine_conf->code_size;
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int eccsteps = engine_conf->nsteps;
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u8 *ecccalc = engine_conf->calc_buf;
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u8 *ecccode = engine_conf->code_buf;
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unsigned int max_bitflips = 0;
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u8 *data = req->databuf.in;
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int i, ret;
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/* Nothing to do for a raw operation */
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if (req->mode == MTD_OPS_RAW)
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return 0;
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/* This engine does not provide BBM/free OOB bytes protection */
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if (!req->datalen)
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return 0;
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/* No more preparation for page write */
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if (req->type == NAND_PAGE_WRITE) {
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nand_ecc_restore_req(&engine_conf->req_ctx, req);
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return 0;
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}
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/* Finish a page read: retrieve the (raw) ECC bytes*/
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ret = mtd_ooblayout_get_eccbytes(mtd, ecccode, req->oobbuf.in, 0,
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total);
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if (ret)
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return ret;
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/* Calculate the ECC bytes */
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for (i = 0; eccsteps; eccsteps--, i += eccbytes, data += eccsize)
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nand_ecc_sw_bch_calculate(nand, data, &ecccalc[i]);
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/* Finish a page read: compare and correct */
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for (eccsteps = engine_conf->nsteps, i = 0, data = req->databuf.in;
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eccsteps;
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eccsteps--, i += eccbytes, data += eccsize) {
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int stat = nand_ecc_sw_bch_correct(nand, data,
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&ecccode[i],
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&ecccalc[i]);
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if (stat < 0) {
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mtd->ecc_stats.failed++;
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} else {
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mtd->ecc_stats.corrected += stat;
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max_bitflips = max_t(unsigned int, max_bitflips, stat);
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}
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}
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nand_ecc_restore_req(&engine_conf->req_ctx, req);
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return max_bitflips;
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}
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static struct nand_ecc_engine_ops nand_ecc_sw_bch_engine_ops = {
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.init_ctx = nand_ecc_sw_bch_init_ctx,
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.cleanup_ctx = nand_ecc_sw_bch_cleanup_ctx,
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.prepare_io_req = nand_ecc_sw_bch_prepare_io_req,
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.finish_io_req = nand_ecc_sw_bch_finish_io_req,
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};
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static struct nand_ecc_engine nand_ecc_sw_bch_engine = {
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.ops = &nand_ecc_sw_bch_engine_ops,
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};
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struct nand_ecc_engine *nand_ecc_sw_bch_get_engine(void)
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{
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return &nand_ecc_sw_bch_engine;
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}
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EXPORT_SYMBOL(nand_ecc_sw_bch_get_engine);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Ivan Djelic <ivan.djelic@parrot.com>");
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@ -5150,17 +5150,11 @@ int rawnand_sw_bch_init(struct nand_chip *chip)
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base->ecc.user_conf.step_size = chip->ecc.size;
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base->ecc.user_conf.strength = chip->ecc.strength;
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engine_conf = kzalloc(sizeof(*engine_conf), GFP_KERNEL);
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if (!engine_conf)
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return -ENOMEM;
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engine_conf->code_size = chip->ecc.bytes;
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base->ecc.ctx.priv = engine_conf;
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ret = nand_ecc_sw_bch_init(base);
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ret = nand_ecc_sw_bch_init_ctx(base);
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if (ret)
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kfree(base->ecc.ctx.priv);
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return ret;
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engine_conf = base->ecc.ctx.priv;
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chip->ecc.size = base->ecc.ctx.conf.step_size;
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chip->ecc.strength = base->ecc.ctx.conf.strength;
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@ -5168,7 +5162,7 @@ int rawnand_sw_bch_init(struct nand_chip *chip)
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chip->ecc.steps = engine_conf->nsteps;
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chip->ecc.bytes = engine_conf->code_size;
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return ret;
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return 0;
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}
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EXPORT_SYMBOL(rawnand_sw_bch_init);
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@ -5194,9 +5188,7 @@ void rawnand_sw_bch_cleanup(struct nand_chip *chip)
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{
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struct nand_device *base = &chip->base;
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nand_ecc_sw_bch_cleanup(base);
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kfree(base->ecc.ctx.priv);
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nand_ecc_sw_bch_cleanup_ctx(base);
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}
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EXPORT_SYMBOL(rawnand_sw_bch_cleanup);
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@ -5308,51 +5300,15 @@ static int nand_set_ecc_soft_ops(struct nand_chip *chip)
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ecc->read_oob = nand_read_oob_std;
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ecc->write_oob = nand_write_oob_std;
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/*
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* Board driver should supply ecc.size and ecc.strength
|
||||
* values to select how many bits are correctable.
|
||||
* Otherwise, default to 4 bits for large page devices.
|
||||
*/
|
||||
if (!ecc->size && (mtd->oobsize >= 64)) {
|
||||
ecc->size = 512;
|
||||
ecc->strength = 4;
|
||||
}
|
||||
|
||||
/*
|
||||
* if no ecc placement scheme was provided pickup the default
|
||||
* large page one.
|
||||
*/
|
||||
if (!mtd->ooblayout) {
|
||||
/* handle large page devices only */
|
||||
if (mtd->oobsize < 64) {
|
||||
WARN(1, "OOB layout is required when using software BCH on small pages\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
mtd_set_ooblayout(mtd, nand_get_large_page_ooblayout());
|
||||
|
||||
}
|
||||
|
||||
/*
|
||||
* We can only maximize ECC config when the default layout is
|
||||
* used, otherwise we don't know how many bytes can really be
|
||||
* used.
|
||||
*/
|
||||
if (mtd->ooblayout == nand_get_large_page_ooblayout() &&
|
||||
nanddev->ecc.user_conf.flags & NAND_ECC_MAXIMIZE_STRENGTH) {
|
||||
int steps, bytes;
|
||||
if (nanddev->ecc.user_conf.flags & NAND_ECC_MAXIMIZE_STRENGTH &&
|
||||
mtd->ooblayout != nand_get_large_page_ooblayout())
|
||||
nanddev->ecc.user_conf.flags &= ~NAND_ECC_MAXIMIZE_STRENGTH;
|
||||
|
||||
/* Always prefer 1k blocks over 512bytes ones */
|
||||
ecc->size = 1024;
|
||||
steps = mtd->writesize / ecc->size;
|
||||
|
||||
/* Reserve 2 bytes for the BBM */
|
||||
bytes = (mtd->oobsize - 2) / steps;
|
||||
ecc->strength = bytes * 8 / fls(8 * ecc->size);
|
||||
}
|
||||
|
||||
/* See the software BCH ECC initialization for details */
|
||||
ecc->bytes = 0;
|
||||
ret = rawnand_sw_bch_init(chip);
|
||||
if (ret) {
|
||||
WARN(1, "BCH ECC initialization failed!\n");
|
||||
|
||||
@ -13,8 +13,8 @@
|
||||
|
||||
/**
|
||||
* struct nand_ecc_sw_bch_conf - private software BCH ECC engine structure
|
||||
* @reqooblen: Save the actual user OOB length requested before overwriting it
|
||||
* @spare_oobbuf: Spare OOB buffer if none is provided
|
||||
* @req_ctx: Save request context and tweak the original request to fit the
|
||||
* engine needs
|
||||
* @code_size: Number of bytes needed to store a code (one code per step)
|
||||
* @nsteps: Number of steps
|
||||
* @calc_buf: Buffer to use when calculating ECC bytes
|
||||
@ -24,8 +24,7 @@
|
||||
* @eccmask: XOR ecc mask, allows erased pages to be decoded as valid
|
||||
*/
|
||||
struct nand_ecc_sw_bch_conf {
|
||||
unsigned int reqooblen;
|
||||
void *spare_oobbuf;
|
||||
struct nand_ecc_req_tweak_ctx req_ctx;
|
||||
unsigned int code_size;
|
||||
unsigned int nsteps;
|
||||
u8 *calc_buf;
|
||||
@ -41,8 +40,9 @@ int nand_ecc_sw_bch_calculate(struct nand_device *nand,
|
||||
const unsigned char *buf, unsigned char *code);
|
||||
int nand_ecc_sw_bch_correct(struct nand_device *nand, unsigned char *buf,
|
||||
unsigned char *read_ecc, unsigned char *calc_ecc);
|
||||
int nand_ecc_sw_bch_init(struct nand_device *nand);
|
||||
void nand_ecc_sw_bch_cleanup(struct nand_device *nand);
|
||||
int nand_ecc_sw_bch_init_ctx(struct nand_device *nand);
|
||||
void nand_ecc_sw_bch_cleanup_ctx(struct nand_device *nand);
|
||||
struct nand_ecc_engine *nand_ecc_sw_bch_get_engine(void);
|
||||
|
||||
#else /* !CONFIG_MTD_NAND_ECC_SW_BCH */
|
||||
|
||||
@ -61,12 +61,12 @@ static inline int nand_ecc_sw_bch_correct(struct nand_device *nand,
|
||||
return -ENOTSUPP;
|
||||
}
|
||||
|
||||
static inline int nand_ecc_sw_bch_init(struct nand_device *nand)
|
||||
static inline int nand_ecc_sw_bch_init_ctx(struct nand_device *nand)
|
||||
{
|
||||
return -ENOTSUPP;
|
||||
}
|
||||
|
||||
static inline void nand_ecc_sw_bch_cleanup(struct nand_device *nand) {}
|
||||
static inline void nand_ecc_sw_bch_cleanup_ctx(struct nand_device *nand) {}
|
||||
|
||||
#endif /* CONFIG_MTD_NAND_ECC_SW_BCH */
|
||||
|
||||
|
||||
@ -278,6 +278,15 @@ int nand_ecc_finish_io_req(struct nand_device *nand,
|
||||
struct nand_page_io_req *req);
|
||||
bool nand_ecc_is_strong_enough(struct nand_device *nand);
|
||||
|
||||
#if IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_BCH)
|
||||
struct nand_ecc_engine *nand_ecc_sw_bch_get_engine(void);
|
||||
#else
|
||||
static inline struct nand_ecc_engine *nand_ecc_sw_bch_get_engine(void)
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
#endif /* CONFIG_MTD_NAND_ECC_SW_BCH */
|
||||
|
||||
/**
|
||||
* struct nand_ecc_req_tweak_ctx - Help for automatically tweaking requests
|
||||
* @orig_req: Pointer to the original IO request
|
||||
|
||||
Loading…
Reference in New Issue
Block a user