[U-Boot] [PATCH v2 3/3] efi_loader: remove block device details from efi file

[AKASHI Takahiro <takahiro.akashi@linaro.org>]

Alex,

On Wed, Jan 09, 2019 at 10:18:16AM +0100, Alexander Graf wrote:
> 
> 
> On 15.11.18 05:58, AKASHI Takahiro wrote:
> > Logically, details on u-boot block device used to implement efi file
> > protocol are mostly unnecessary, as well as being duplicated, in
> > efi_file structure.
> > Moreover, a newly introduced flag, _EFI_DISK_FLAG_INVALID, should be
> > honored in any file operations via efi file protocol.
> > These observation suggests that those internal details be set behind
> > efi_disk object.
> > 
> > So rework in this patch addresses all those issues above although
> > there is little change in its functionality.
> > 
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
> > ---
> >  include/efi_loader.h      |  6 +++++-
> >  lib/efi_loader/efi_disk.c | 38 ++++++++++++++++++++++++++++++++++++--
> >  lib/efi_loader/efi_file.c | 21 ++++++++-------------
> >  3 files changed, 49 insertions(+), 16 deletions(-)
> > 
> > diff --git a/include/efi_loader.h b/include/efi_loader.h
> > index 3bae1844befb..108ef3fe52ee 100644
> > --- a/include/efi_loader.h
> > +++ b/include/efi_loader.h
> > @@ -264,6 +264,10 @@ efi_status_t efi_disk_register(void);
> >  bool efi_disk_is_valid(efi_handle_t handle);
> >  /* Called by bootefi to find and update disk storage information */
> >  efi_status_t efi_disk_update(void);
> > +/* Called by file protocol to set internal block io device */
> > +int efi_disk_set_blk_dev(efi_handle_t disk);
> > +/* Called by file protocol to get disk/partition information */
> > +int efi_disk_get_info(efi_handle_t disk, disk_partition_t *part);
> >  /* Create handles and protocols for the partitions of a block device */
> >  int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc,
> >  			       const char *if_typename, int diskid,
> > @@ -355,7 +359,7 @@ void efi_signal_event(struct efi_event *event, bool check_tpl);
> >  
> >  /* open file system: */
> >  struct efi_simple_file_system_protocol *efi_simple_file_system(
> > -		struct blk_desc *desc, int part, struct efi_device_path *dp);
> > +		efi_handle_t disk);
> >  
> >  /* open file from device-path: */
> >  struct efi_file_handle *efi_file_from_path(struct efi_device_path *fp);
> > diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c
> > index 0c4d79ee3fc9..180e8e10bb28 100644
> > --- a/lib/efi_loader/efi_disk.c
> > +++ b/lib/efi_loader/efi_disk.c
> > @@ -9,6 +9,7 @@
> >  #include <blk.h>
> >  #include <dm.h>
> >  #include <efi_loader.h>
> > +#include <fs.h>
> >  #include <part.h>
> >  #include <malloc.h>
> >  
> > @@ -254,6 +255,40 @@ efi_fs_from_path(struct efi_device_path *full_path)
> >  	return handler->protocol_interface;
> >  }
> >  
> > +/*
> > + * Set block device for later block io's from file system protocol
> > + *
> > + * @disk	handle to uefi disk device
> > + * @return	0 for success, -1 for failure
> > + */
> > +int efi_disk_set_blk_dev(efi_handle_t disk)
> > +{
> > +	struct efi_disk_obj *diskobj;
> > +
> > +	diskobj = container_of(disk, struct efi_disk_obj, header);
> > +
> > +	return fs_set_blk_dev_with_part(diskobj->desc, diskobj->part);
> > +}
> > +
> > +/*
> > + * Get disk/partition information
> > + *
> > + * @disk	handle to uefi disk device
> > + * @part	pointer to disk/partition information to be returned
> > + * @return	0 for success, -1 for failure
> > + */
> > +int efi_disk_get_info(efi_handle_t disk, disk_partition_t *part)
> > +{
> > +	struct efi_disk_obj *diskobj;
> > +
> > +	diskobj = container_of(disk, struct efi_disk_obj, header);
> > +
> > +	if (diskobj->part >= 1)
> > +		return part_get_info(diskobj->desc, diskobj->part, part);
> > +	else
> > +		return part_get_info_whole_disk(diskobj->desc, part);
> > +}
> > +
> >  /*
> >   * Create a handle for a partition or disk
> >   *
> > @@ -308,8 +343,7 @@ static efi_status_t efi_disk_add_dev(
> >  	if (ret != EFI_SUCCESS)
> >  		return ret;
> >  	if (part >= 1) {
> > -		diskobj->volume = efi_simple_file_system(desc, part,
> > -							 diskobj->dp);
> > +		diskobj->volume = efi_simple_file_system(&diskobj->header);
> >  		ret = efi_add_protocol(&diskobj->header,
> >  				       &efi_simple_file_system_protocol_guid,
> >  				       diskobj->volume);
> > diff --git a/lib/efi_loader/efi_file.c b/lib/efi_loader/efi_file.c
> > index beb4fba917d8..944383224f30 100644
> > --- a/lib/efi_loader/efi_file.c
> > +++ b/lib/efi_loader/efi_file.c
> > @@ -17,9 +17,7 @@ const efi_guid_t efi_file_system_info_guid = EFI_FILE_SYSTEM_INFO_GUID;
> >  
> >  struct file_system {
> >  	struct efi_simple_file_system_protocol base;
> > -	struct efi_device_path *dp;
> > -	struct blk_desc *desc;
> > -	int part;
> > +	efi_handle_t disk;
> 
> Is there a particular reason we can't just make this a struct
> efi_disk_obj *?

Just because efi_disk_obj is an internally-defined structure in efi_disk.c.

> Inside our own code base, we don't need to abstract things away to
> handles, right? We also want to have the compiler catch the fact early
> if people pass in non-disk-objects in as parameter.

If you don't mind efi_disk_obj definition being moved to, say, efi_loader.h,
I would follow your suggestion.

Thanks,
-Takahiro Akashi

> 
> Alex