Currently, our overlay blob will grow to include the size of the complete
overlay blob we're applying. This doesn't scale very well with a lot of
overlays- they tend to include a lot of overhead, and they will generally
only add a fraction of their total size to the blob they're being applied
to.
To combat this, pack the blob as we apply new overlays and keep track of how
many overlays we've applied. Only ubldr has any fixups to be applied after
overlays, so we only need to re-pad the blob in ubldr. Presumably the
allocation won't fail since we just did a lot worse in trying to apply
overlays and succeeded.
I have no intention of removing the padding in make_dtb.sh. There might be
an argument to be had over whether it should be configurable, since ubldr
*is* the only loader that actually has fixups to be applied and we can do
this at runtime, but I'm not too concerned about this.
This diff has been sitting in Phabricator for a year and a half, but I've
decided to flush it as it does make sure that we're scaling the blob
appropriately and leave room at the end for fixups in case of some freak
circumstance where applying overlays leaves us with a blob of insufficient
size.
Reviewed by: gonzo (a long time ago)
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D14133
This adds some new commands to loader :
- pnpmatch
This takes a pnpinfo string as argument and tries to find a kernel module
associated with it. -v and -d option are available and are the same as in
devmatch (v is verbose, d dumps the hints).
- pnpload
This takes a pnpinfo string as argument and tries to load a kernel module
associated with it.
- pnpautoload
This will attempt to load every kernel module for each buses. Each buses are
probed, the probe function will generate pnpinfo string and load kernel module
associated with it if it exists.
Only simplebus for FDT system is implemented for now.
Since we need the dtb and overlays to be applied before searching the tree
fdt_devmatch_next will load and apply the dtb + overlays.
All the pnp parsing code comes from devmatch and is the same at 99%.
Reviewed by: imp, kevans
Differential Revision: https://reviews.freebsd.org/D19498
When efi_autoload is called it will call fdt_setup_fdtp which setup the
dtb and overlays. If a user already loaded at dtb or overlays or just
printed the efi provided dtb, this will re-setup everything and also
re-applying the overlays.
Test that everything is setup before doing it again.
Reviewed by: kevans
Differential Revision: https://reviews.freebsd.org/D20059
It was pointed out that manually loading a .dtb to be used rather than
relying on platform-specific method for loading .dtb will result in overlays
not being applied. This was true because overlay loading was hacked into
fdt_platform_load_dtb, rather than done in a way more independent from how
the .dtb is loaded.
Instead, push overlay loading (for now) out into an
fdt_platform_load_overlays. This method easily allows ubldr to pull in any
fdt_overlays specified in the ub env, and omits overlay-checking on
platforms where they're not tested and/or not desired (e.g. powerpc). If we
eventually stop caring about fdt_overlays from ubenv (if we ever cared),
this method should get chopped out in favor of just calling
fdt_load_dtb_overlays() directly.
Reported by: Manuel Stühn (freebsdnewbie freenet de)
This should have been done as part of r327350, but due to lack of foresight
it came later. In the different places we apply overlays, we duplicate the
bits that check for fdt_overlays in the environment and supplement that with
any other places we need to check for overlays to load. These "other places"
will be loader specific and are not candidates for consolidation.
Provide an fdt_load_dtb_overlays to capture the common logic, allow passing
in an additional list of overlays to be loaded. This additional list of
overlays is used in practice for ubldr to pull in any fdt_overlays passed to
it from U-Boot environment, but it can be used for any other source of
overlays.
These additional overlays supplement loader.conf(5) fdt_overlays, rather
than replace, so that we're not restricted to specifying overlays in only
one place. This is a change from previous behavior where loader.conf(5)
supplied fdt_overlays would cause us to ignore U-Boot environment, and this
seems nonsensical- user should have sufficient control over both of these
aspects, or lack of control for good reasons.
A knob could be considered in the future to ignore U-Boot supplied overlays,
but the supplemental treatment seems like a good start.
Reviewed by: imp (earlier version), gonzo (earlier version)
Differential Revision: https://reviews.freebsd.org/D13993
