On Fri, Nov 17, 2017 at 03:40:51PM +0100, Lukasz Majewski wrote: > Hi Maxime, > > > Hi Lukasz, Tom, > > > > On Fri, Nov 17, 2017 at 03:00:15PM +0100, Lukasz Majewski wrote: > > > On Fri, 17 Nov 2017 08:41:05 -0500 > > > Tom Rini <tr...@konsulko.com> wrote: > > > > > > > On Fri, Nov 17, 2017 at 10:24:37AM +0100, Lukasz Majewski wrote: > > > > > Hi Maxime, > > > > > > > > > > > Now that we have everything in place to support multiple > > > > > > environment, let's make sure the current code can use it. > > > > > > > > > > > > The priority used between the various environment is the same > > > > > > one that was used in the code previously. > > > > > > > > > > > > At read / init times, the highest priority environment is > > > > > > going to be detected, and we'll use the same one without > > > > > > lookup during writes. This should implement the same > > > > > > behaviour than we currently have. > > > > > > > > > > > > Signed-off-by: Maxime Ripard > > > > > > <maxime.rip...@free-electrons.com> --- > > > > > > env/env.c | 75 > > > > > > ++++++++++++++++++++++++++++++++++++++++++--------------------- > > > > > > 1 file changed, 50 insertions(+), 25 deletions(-) > > > > > > > > > > > > diff --git a/env/env.c b/env/env.c > > > > > > index 1d13220aa79b..6af9f897b0ae 100644 > > > > > > --- a/env/env.c > > > > > > +++ b/env/env.c > > > > > > @@ -26,33 +26,58 @@ static struct env_driver > > > > > > *_env_driver_lookup(enum env_location loc) return NULL; > > > > > > } > > > > > > > > > > > > +static enum env_location env_locations[] = { > > > > > > +#ifdef CONFIG_ENV_IS_IN_EEPROM > > > > > > + ENVL_EEPROM, > > > > > > +#endif > > > > > > +#ifdef CONFIG_ENV_IS_IN_FAT > > > > > > + ENVL_FAT, > > > > > > +#endif > > > > > > +#ifdef CONFIG_ENV_IS_IN_FLASH > > > > > > + ENVL_FLASH, > > > > > > +#endif > > > > > > +#ifdef CONFIG_ENV_IS_IN_MMC > > > > > > + ENVL_MMC, > > > > > > +#endif > > > > > > +#ifdef CONFIG_ENV_IS_IN_NAND > > > > > > + ENVL_NAND, > > > > > > +#endif > > > > > > +#ifdef CONFIG_ENV_IS_IN_NVRAM > > > > > > + ENVL_NVRAM, > > > > > > +#endif > > > > > > +#ifdef CONFIG_ENV_IS_IN_REMOTE > > > > > > + ENVL_REMOTE, > > > > > > +#endif > > > > > > +#ifdef CONFIG_ENV_IS_IN_SPI_FLASH > > > > > > + ENVL_SPI_FLASH, > > > > > > +#endif > > > > > > +#ifdef CONFIG_ENV_IS_IN_UBI > > > > > > + ENVL_UBI, > > > > > > +#endif > > > > > > +#ifdef CONFIG_ENV_IS_NOWHERE > > > > > > + ENVL_NOWHERE, > > > > > > +#endif > > > > > > + ENVL_UNKNOWN, > > > > > > +}; > > > > > > + > > > > > > +static enum env_location env_load_location; > > > > > > + > > > > > > static enum env_location env_get_location(enum env_operation > > > > > > op, int prio) { > > > > > > - if (prio >= 1) > > > > > > - return ENVL_UNKNOWN; > > > > > > - > > > > > > - if IS_ENABLED(CONFIG_ENV_IS_IN_EEPROM) > > > > > > - return ENVL_EEPROM; > > > > > > - else if IS_ENABLED(CONFIG_ENV_IS_IN_FAT) > > > > > > - return ENVL_FAT; > > > > > > - else if IS_ENABLED(CONFIG_ENV_IS_IN_FLASH) > > > > > > - return ENVL_FLASH; > > > > > > - else if IS_ENABLED(CONFIG_ENV_IS_IN_MMC) > > > > > > - return ENVL_MMC; > > > > > > - else if IS_ENABLED(CONFIG_ENV_IS_IN_NAND) > > > > > > - return ENVL_NAND; > > > > > > - else if IS_ENABLED(CONFIG_ENV_IS_IN_NVRAM) > > > > > > - return ENVL_NVRAM; > > > > > > - else if IS_ENABLED(CONFIG_ENV_IS_IN_REMOTE) > > > > > > - return ENVL_REMOTE; > > > > > > - else if IS_ENABLED(CONFIG_ENV_IS_IN_SPI_FLASH) > > > > > > - return ENVL_SPI_FLASH; > > > > > > - else if IS_ENABLED(CONFIG_ENV_IS_IN_UBI) > > > > > > - return ENVL_UBI; > > > > > > - else if IS_ENABLED(CONFIG_ENV_IS_NOWHERE) > > > > > > - return ENVL_NOWHERE; > > > > > > - else > > > > > > - return ENVL_UNKNOWN; > > > > > > + switch (op) { > > > > > > + case ENVO_GET_CHAR: > > > > > > + case ENVO_INIT: > > > > > > + case ENVO_LOAD: > > > > > > + if (prio >= ARRAY_SIZE(env_locations)) > > > > > > + return -ENODEV; > > > > > > + > > > > > > + return env_load_location = > > > > > > env_locations[prio]; + > > > > > > + case ENVO_SAVE: > > > > > > + return env_load_location; > > > > > > + } > > > > > > + > > > > > > + return ENVL_UNKNOWN; > > > > > > } > > > > > > > > > > > > static struct env_driver *env_driver_lookup(enum > > > > > > env_operation op, int prio) > > > > > > > > > > I'm just wondering... > > > > > > > > > > Do you think that it may be helpful to have a way to force > > > > > particular environment to be used (despite of the priority)? > > > > > > > > That's one of the hard parts of this, yes. I think I had > > > > suggested before that we handle that in a follow up series? > > > > > > > > > > I don't want to say that this must be done now. I just can imagine > > > that we may need such feature in some point. > > > > So I guess this question is also part of the comment Lukasz had on the > > other patch. > > > > The current implementation is effectively hardcoding the environment > > by doing two things: > > - Rejecting any priority other than 0, which is the highest. It > > basically says to the code that there is no further alternative > > and that its loop should stop there. > > - Returning the first environment in the array. > > > > If one wanted to hardcode the environment to something else than the > > default behaviour, you can always implement env_get_location in your > > board by doing something like: > > > > enum env_location env_get_location (enum env_operation op, int prio) > > { > > if (prio) > > return ENVL_UNKNOWN; > > > > return ENVL_MMC; /* Or whatever you want */ > > } > > The env_get_location defined per board would work for me. > > > > > Like I was saying, the default implementation already kind of does > > that. Or maybe we want the default one to not hardcode it and just > > deal with alternatives? > > I think that having the code hardcoded (as it is now) is acceptable for > making the feature way to main line. I suppose that > you would add the priorities handling in further patches?
Just adding the same priorities than right now is quite easy. What I'm a bit afraid is how exactly that priority handling could be done in a generic way, because I guess everyone is going to want something a bit different. And if we just decide to put it in the boards, then it's already supported. Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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