[resent RFC 14/22] efi_loader: disk: a helper function to create efi_disk objects from udevice

[AKASHI Takahiro]

On Mon, Oct 04, 2021 at 09:50:02PM +0300, Ilias Apalodimas wrote:
> On Mon, Oct 04, 2021 at 12:44:22PM +0900, AKASHI Takahiro wrote:
> > Add efi_disk_create() function.
> > 
> > Any UEFI handle created by efi_disk_create() can be treated as a efi_disk
> > object, the udevice is either a UCLASS_BLK (a whole raw disk) or
> > UCLASS_PARTITION (a disk partition).
> > 
> > So this function is expected to be called every time such an udevice
> > is detected and activated through a device model's "probe" interface.
> > 
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
> > ---
> >  include/efi_loader.h      |  2 +
> >  lib/efi_loader/efi_disk.c | 92 +++++++++++++++++++++++++++++++++++++++
> >  2 files changed, 94 insertions(+)
> > 
> > diff --git a/include/efi_loader.h b/include/efi_loader.h
> > index c440962fe522..751fde7fb153 100644
> > --- a/include/efi_loader.h
> > +++ b/include/efi_loader.h
> > @@ -517,6 +517,8 @@ efi_status_t EFIAPI efi_convert_pointer(efi_uintn_t debug_disposition,
> >  void efi_carve_out_dt_rsv(void *fdt);
> >  /* Called by bootefi to make console interface available */
> >  efi_status_t efi_console_register(void);
> > +/* Called when a block devices has been probed */
> > +int efi_disk_create(struct udevice *dev);
> >  /* Called by bootefi to make all disk storage accessible as EFI objects */
> >  efi_status_t efi_disk_register(void);
> >  /* Called by efi_init_obj_list() to install EFI_RNG_PROTOCOL */
> > diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c
> > index cd5528046251..3fae40e034fb 100644
> > --- a/lib/efi_loader/efi_disk.c
> > +++ b/lib/efi_loader/efi_disk.c
> > @@ -10,6 +10,7 @@
> >  #include <common.h>
> >  #include <blk.h>
> >  #include <dm.h>
> > +#include <dm/device-internal.h>
> >  #include <efi_loader.h>
> >  #include <fs.h>
> >  #include <log.h>
> > @@ -484,6 +485,7 @@ error:
> >  	return ret;
> >  }
> >  
> > +#ifndef CONFIG_BLK
> >  /**
> >   * efi_disk_create_partitions() - create handles and protocols for partitions
> >   *
> > @@ -531,6 +533,96 @@ int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc,
> >  
> >  	return disks;
> >  }
> > +#endif /* CONFIG_BLK */
> > +
> > +/*
> > + * Create a handle for a whole raw disk
> > + *
> > + * @dev		uclass device
> > + * @return	0 on success, -1 otherwise
> > + */
> > +static int efi_disk_create_raw(struct udevice *dev)
> > +{
> > +	struct efi_disk_obj *disk;
> > +	struct blk_desc *desc;
> > +	const char *if_typename;
> > +	int diskid;
> > +	efi_status_t ret;
> > +
> > +	desc = dev_get_uclass_plat(dev);
> > +	if_typename = blk_get_if_type_name(desc->if_type);
> > +	diskid = desc->devnum;
> > +
> > +	ret = efi_disk_add_dev(NULL, NULL, if_typename, desc,
> > +			       diskid, NULL, 0, &disk);
> > +	if (ret != EFI_SUCCESS) {
> > +		log_err("Adding disk %s%d failed\n", if_typename, diskid);
> > +		return -1;
> > +	}
> > +	disk->dev = dev;
> > +	dev->efi_obj = &disk->header;
> > +
> > +	return 0;
> > +}
> > +
> > +/*
> > + * Create a handle for a disk partition
> > + *
> > + * @dev		uclass device
> > + * @return	0 on success, -1 otherwise
> > + */
> > +static int efi_disk_create_part(struct udevice *dev)
> > +{
> > +	efi_handle_t parent;
> > +	struct blk_desc *desc;
> > +	const char *if_typename;
> > +	struct disk_part *part_data;
> > +	struct disk_partition *info;
> > +	unsigned int part;
> > +	int diskid;
> > +	struct efi_device_path *dp = NULL;
> > +	struct efi_disk_obj *disk;
> > +	efi_status_t ret;
> > +
> > +	parent = dev->parent->efi_obj;
> > +	desc = dev_get_uclass_plat(dev->parent);
> > +	if_typename = blk_get_if_type_name(desc->if_type);
> > +	diskid = desc->devnum;
> > +
> > +	part_data = dev_get_uclass_plat(dev);
> > +	part = part_data->partnum;
> > +	info = &part_data->gpt_part_info;
> > +
> > +	/* TODO: should not use desc? */
> > +	dp = efi_dp_from_part(desc, 0);
> > +
> > +	ret = efi_disk_add_dev(parent, dp, if_typename, desc, diskid,
> > +			       info, part, &disk);
> > +	if (ret != EFI_SUCCESS) {
> > +		log_err("Adding partition %s%d:%x failed\n",
> > +			if_typename, diskid, part);
> > +		return -1;
> > +	}
> > +	disk->dev = dev;
> > +	dev->efi_obj = &disk->header;
> > +
> > +	return 0;
> > +}
> 
> Can't we add a 'bool part' on this one and have a single function?

Yes, but I would like to first discuss how partitions should be treated
in the driver model. Then I will think of unifying related functions.

-Takahiro Akashi

> > +
> > +int efi_disk_create(struct udevice *dev)
> > +{
> > +	enum uclass_id id;
> > +
> > +	id = device_get_uclass_id(dev);
> > +
> > +	if (id == UCLASS_BLK)
> > +		return efi_disk_create_raw(dev);
> > +
> > +	if (id == UCLASS_PARTITION)
> > +		return efi_disk_create_part(dev);
> > +
> > +	return -1;
> > +}
> >  
> >  /**
> >   * efi_disk_register() - register block devices
> > -- 
> > 2.33.0
> > 
> 
> Regards
> /Ilias