[PATCH v8 3/4] Boot var automatic management for removable medias

[AKASHI Takahiro]

On Wed, Jun 07, 2023 at 09:38:30AM +0300, Ilias Apalodimas wrote:
> On Wed, 7 Jun 2023 at 03:41, AKASHI Takahiro <takahiro.akashi at linaro.org> wrote:
> >
> > On Tue, Jun 06, 2023 at 09:37:20AM -0700, Raymond Mao wrote:
> > > Changes for complying to EFI spec §3.5.1.1
> > > 'Removable Media Boot Behavior'.
> > > Boot variables can be automatically generated during a removable
> > > media is probed. At the same time, unused boot variables will be
> > > detected and removed.
> > > Please note that currently the function 'efi_disk_remove' is being
> > > invoked during exiting U-Boot and booting an OS - that is why we
> > > don't add the boot variables management inside 'efi_disk_remove'.
> >
> > It's not accurate.
> > For instance, a user may run "scsi scan" or "usb reset" to re-enumerate
> > devices added (or removed). They will invoke "remove" against pre-existing
> > devices before invoking a "probe" routine.
> >
> > So the text above doesn't justify not implementing "remove" hook.
> 
> I am not sure I am following you here.  Yes resetting the device will
> call the remove callback and it's a current problem of the existing
> implementation,

I think it is a design decision.

> but why is the commit message inaccurate?  Won't
> exiting u-boot to jump to the OS call all the _remove() functions?

Exiting U-Boot is irrelevant to maintaining boot options.

-Takahiro Akashi

> Thanks
> /Ilias
> >
> > -Takahiro Akashi
> >
> > > Signed-off-by: Raymond Mao <raymond.mao at linaro.org>
> > > Reviewed-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
> > > Reviewed-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
> > > ---
> > > Changes in v3
> > > - Split the patch into moving and renaming functions and
> > >   individual patches for each changed functionality
> > > Changes in v5
> > > - Move function call of efi_bootmgr_update_media_device_boot_option()
> > >   from efi_init_variables() to efi_init_obj_list()
> > > Changes in v6
> > > - Revert unrelated changes
> > > Changes in v7
> > > - adapt the return code of function
> > >   efi_bootmgr_update_media_device_boot_option()
> > > Changes in v8
> > > - add a note in the commit message for future reference
> > >
> > >  lib/efi_loader/efi_disk.c  | 7 +++++++
> > >  lib/efi_loader/efi_setup.c | 5 +++++
> > >  2 files changed, 12 insertions(+)
> > >
> > > diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c
> > > index d2256713a8..d9b48ecf64 100644
> > > --- a/lib/efi_loader/efi_disk.c
> > > +++ b/lib/efi_loader/efi_disk.c
> > > @@ -687,6 +687,13 @@ int efi_disk_probe(void *ctx, struct event *event)
> > >                       return -1;
> > >       }
> > >
> > > +     /* only do the boot option management when UEFI sub-system is initialized */
> > > +     if (efi_obj_list_initialized == EFI_SUCCESS) {
> > > +             ret = efi_bootmgr_update_media_device_boot_option();
> > > +             if (ret != EFI_SUCCESS)
> > > +                     return -1;
> > > +     }
> > > +
> > >       return 0;
> > >  }
> > >
> > > diff --git a/lib/efi_loader/efi_setup.c b/lib/efi_loader/efi_setup.c
> > > index 58d4e13402..877f3878d6 100644
> > > --- a/lib/efi_loader/efi_setup.c
> > > +++ b/lib/efi_loader/efi_setup.c
> > > @@ -245,6 +245,11 @@ efi_status_t efi_init_obj_list(void)
> > >       if (ret != EFI_SUCCESS)
> > >               goto out;
> > >
> > > +     /* update boot option after variable service initialized */
> > > +     ret = efi_bootmgr_update_media_device_boot_option();
> > > +     if (ret != EFI_SUCCESS)
> > > +             goto out;
> > > +
> > >       /* Define supported languages */
> > >       ret = efi_init_platform_lang();
> > >       if (ret != EFI_SUCCESS)
> > > --
> > > 2.25.1
> > >