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Date: Mon, 28 Sep 2015 11:40:08 +0200
From: Boris Brezillon <boris.brezillon@...e-electrons.com>
To: "Bean Huo 霍斌斌 (beanhuo)" <beanhuo@...ron.com>
Cc: "dedekind1@...il.com" <dedekind1@...il.com>,
"adrian.hunter@...el.com" <adrian.hunter@...el.com>,
"computersforpeace@...il.com" <computersforpeace@...il.com>,
"baruch@...s.co.il" <baruch@...s.co.il>,
"asierra@...-inc.com" <asierra@...-inc.com>,
"guz.fnst@...fujitsu.com" <guz.fnst@...fujitsu.com>,
"gsi@...x.de" <gsi@...x.de>, "richard@....at" <richard@....at>,
David Woodhouse <dwmw2@...radead.org>,
"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
"Frank Liu 刘群 (frankliu)" <frankliu@...ron.com>,
Andrea Scian <rnd4@...e-tech.it>,
"Peter Pan 潘柏宏 (peterpan)" <peterpan@...ron.com>,
"Karl Zhang 张双锣 (karlzhang)"
<karlzhang@...ron.com>,
Iwo Mergler <Iwo.Mergler@...commwireless.com>,
"Jeff Lauruhn (jlauruhn)" <jlauruhn@...ron.com>,
Stefan Roese <sr@...x.de>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/9] drivers:nand:mtd: add support for UBI bakvol in mtd
layer
Hi Bean,
On Mon, 28 Sep 2015 07:02:37 +0000
Bean Huo 霍斌斌 (beanhuo) <beanhuo@...ron.com> wrote:
> Add support for UBI bakvol in mtd layer.
>
> This solution based on MLC NAND dual plane program.
> so add hook in mtd layer.
I know you don't have any other choices to expose "two-plane page
program" to the UBI layer, but I keep thinking that exposing that to
the MTD users is not a good idea (I might be wrong ;-)).
>
> Signed-off-by: Bean Huo <beanhuo@...ron.com>
> ---
> include/linux/mtd/mtd.h | 19 +++++++++++++++++++
> include/linux/mtd/nand.h | 4 ++++
> include/linux/mtd/ubi.h | 9 +++++++++
> 3 files changed, 32 insertions(+)
>
> diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
> index f17fa75..cfcb3a68 100644
> --- a/include/linux/mtd/mtd.h
> +++ b/include/linux/mtd/mtd.h
> @@ -204,6 +204,9 @@ struct mtd_info {
> struct mtd_oob_ops *ops);
> int (*_write_oob) (struct mtd_info *mtd, loff_t to,
> struct mtd_oob_ops *ops);
> + int (*_dual_plane_write_oob) (struct mtd_info *mtd, loff_t to_plane0,
> + struct mtd_oob_ops *ops_plane0, loff_t to_plane1,
> + struct mtd_oob_ops *ops_plane1);
IMHO, if we were about to allow parallel write operations this should
be exposed as a more generic API, something like:
struct mtd_write_op {
loff_t to;
struct mtd_oob_ops ops;
};
struct mtd_multi_write_ops {
struct list_head writes;
};
int (*_multi_write)(struct mtd_info *mtd,
struct mtd_multi_write_ops *ops);
Then the NAND layer could optimize that if the NAND chip supports
"two-plane page program", and if 2 pages in the write list are
fulfilling the requirements.
> int (*_get_fact_prot_info) (struct mtd_info *mtd, size_t len,
> size_t *retlen, struct otp_info *buf);
> int (*_read_fact_prot_reg) (struct mtd_info *mtd, loff_t from,
> @@ -280,6 +283,22 @@ static inline int mtd_write_oob(struct mtd_info *mtd, loff_t to,
> return mtd->_write_oob(mtd, to, ops);
> }
>
> +static inline int mtd_write_dual_plane_oob(struct mtd_info *mtd,
> + loff_t to_plane0, struct mtd_oob_ops *ops0, loff_t to_plane1,
> + struct mtd_oob_ops *ops1)
> +{
> + ops0->retlen = ops0->oobretlen = 0;
> + ops1->retlen = ops1->oobretlen = 0;
> +
> + if (!mtd->_dual_plane_write_oob)
> + return -EOPNOTSUPP;
> + if (!(mtd->flags & MTD_WRITEABLE))
> + return -EROFS;
> +
> + return mtd->_dual_plane_write_oob(mtd, to_plane0, ops0,
> + to_plane1, ops1);
> +}
> +
> int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
> struct otp_info *buf);
> int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
> diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
> index 272f429..4c5be01 100644
> --- a/include/linux/mtd/nand.h
> +++ b/include/linux/mtd/nand.h
> @@ -77,6 +77,7 @@ extern int nand_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
> #define NAND_CMD_READ1 1
> #define NAND_CMD_RNDOUT 5
> #define NAND_CMD_PAGEPROG 0x10
> +#define NAND_CMD_MULTI_PAGEPROG 0x11
> #define NAND_CMD_READOOB 0x50
> #define NAND_CMD_ERASE1 0x60
> #define NAND_CMD_STATUS 0x70
> @@ -671,6 +672,9 @@ struct nand_chip {
> int (*write_page)(struct mtd_info *mtd, struct nand_chip *chip,
> uint32_t offset, int data_len, const uint8_t *buf,
> int oob_required, int page, int cached, int raw);
> + int (*write_plane_page)(struct mtd_info *mtd, struct nand_chip *chip,
> + uint32_t offset, int data_len, const uint8_t *buf,
> + int oob_required, int page, int plane, int raw);
> int (*onfi_set_features)(struct mtd_info *mtd, struct nand_chip *chip,
> int feature_addr, uint8_t *subfeature_para);
> int (*onfi_get_features)(struct mtd_info *mtd, struct nand_chip *chip,
> diff --git a/include/linux/mtd/ubi.h b/include/linux/mtd/ubi.h
> index 1e271cb..1da3418 100644
> --- a/include/linux/mtd/ubi.h
> +++ b/include/linux/mtd/ubi.h
> @@ -35,6 +35,15 @@
> */
> #define UBI_MAX_SG_COUNT 64
>
> +enum {
> + UBI_BAKVOL_UNONE,
> + UBI_BAKVOL_INIT_INFO,
> + UBI_BAKVOL_INIT_INFO_DONE,
> + UBI_BAKVOL_INIT_VOLUME,
> + UBI_BAKVOL_INIT_VOLUME_DONE,
> + UBI_BAKVOL_RUN
> +};
> +
Are those changes related to this patch?
Best Regards,
Boris
--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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