Re: [PATCH v2 10/36] mtd: nand: Introduce the ECC engine abstraction

[Miquel Raynal <miquel.raynal@xxxxxxxxxxx>]

Hi Boris,

Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx> wrote on Sun, 31 Mar
2019 14:10:25 +0200:

> On Mon,  4 Mar 2019 23:28:15 +0100
> Miquel Raynal <miquel.raynal@xxxxxxxxxxx> wrote:
> 
> > Create a generic ECC engine object.
> > 
> > Later the ecc/engine.c file will receive more generic code coming from
> > the raw NAND specific part. This is a base to instantiate ECC engine
> > objects.
> > 
> > Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
> > ---
> >  drivers/mtd/nand/Kconfig                     |   1 +
> >  drivers/mtd/nand/Makefile                    |   1 +
> >  drivers/mtd/nand/ecc/Kconfig                 |   6 +
> >  drivers/mtd/nand/ecc/Makefile                |   3 +
> >  drivers/mtd/nand/ecc/engine.c                | 138 +++++++++++++++++++
> >  drivers/mtd/nand/raw/atmel/nand-controller.c |   9 +-
> >  drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c   |  12 +-
> >  drivers/mtd/nand/raw/marvell_nand.c          |   7 +-
> >  drivers/mtd/nand/raw/mtk_nand.c              |   4 +-
> >  drivers/mtd/nand/raw/nand_base.c             |  17 +--
> >  drivers/mtd/nand/raw/nand_esmt.c             |  11 +-
> >  drivers/mtd/nand/raw/nand_hynix.c            |  41 +++---
> >  drivers/mtd/nand/raw/nand_jedec.c            |   4 +-
> >  drivers/mtd/nand/raw/nand_micron.c           |  14 +-
> >  drivers/mtd/nand/raw/nand_onfi.c             |   8 +-
> >  drivers/mtd/nand/raw/nand_samsung.c          |  19 +--
> >  drivers/mtd/nand/raw/nand_toshiba.c          |  11 +-
> >  drivers/mtd/nand/raw/sunxi_nand.c            |   5 +-
> >  drivers/mtd/nand/raw/tegra_nand.c            |   9 +-
> >  drivers/mtd/nand/spi/core.c                  |   4 +-
> >  drivers/mtd/nand/spi/macronix.c              |   6 +-
> >  drivers/mtd/nand/spi/toshiba.c               |   6 +-  
> 
> Can we please split that in 3 patches:
> 
> 1/ introduce the ECC framework
> 2/ convert spi nand
> 3/ convert raw nand

Split in 2 patches:
1/ Introduce the ECC framework
2/ Change the eccreq parameter of the nand_device structure which
impacts both raw and SPI NAND frameworks.

> 
> >  include/linux/mtd/nand.h                     |  82 ++++++++++-
> >  include/linux/mtd/spinand.h                  |   2 +-
> >  24 files changed, 327 insertions(+), 93 deletions(-)
> >  create mode 100644 drivers/mtd/nand/ecc/Kconfig
> >  create mode 100644 drivers/mtd/nand/ecc/Makefile
> >  create mode 100644 drivers/mtd/nand/ecc/engine.c
> > 
> > diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
> > index d2ef8b89568e..75d0bd18b818 100644
> > --- a/drivers/mtd/nand/Kconfig
> > +++ b/drivers/mtd/nand/Kconfig
> > @@ -6,5 +6,6 @@ config MTD_NAND_CORE
> >  source "drivers/mtd/nand/onenand/Kconfig"
> >  source "drivers/mtd/nand/raw/Kconfig"
> >  source "drivers/mtd/nand/spi/Kconfig"
> > +source "drivers/mtd/nand/ecc/Kconfig"
> >  
> >  endmenu
> > diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
> > index 7ecd80c0a66e..9772e781534d 100644
> > --- a/drivers/mtd/nand/Makefile
> > +++ b/drivers/mtd/nand/Makefile
> > @@ -6,3 +6,4 @@ obj-$(CONFIG_MTD_NAND_CORE) += nandcore.o
> >  obj-y	+= onenand/
> >  obj-y	+= raw/
> >  obj-y	+= spi/
> > +obj-y	+= ecc/
> > diff --git a/drivers/mtd/nand/ecc/Kconfig b/drivers/mtd/nand/ecc/Kconfig
> > new file mode 100644
> > index 000000000000..01439f66ecbf
> > --- /dev/null
> > +++ b/drivers/mtd/nand/ecc/Kconfig
> > @@ -0,0 +1,6 @@
> > +menu "ECC engine support"
> > +
> > +config MTD_NAND_ECC
> > +	tristate
> > +  
> 
> There's already an MTD_NAND_ECC symbol defined in
> drivers/mtd/nand/raw/Kconfig,

Didn't find any?

> plus I don't think we want ecc/engine.c
> to be compiled as a module, but instead be embedded in nand-core.ko.

How would you do that? I don't find the right way to embed
nand_ecc_engine.o directly in nandcore.o. The only solution I found was
to add nandcore-$(<cond>) += ecc/thing.o directly in
drivers/mtd/nand/Makefile but I don't think it is acceptable?

> Not to mention that the name, engine.ko, is probably too generic.

Renamed it nand_ecc_engine.ko for now.

Thanks,
Miquèl

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