[U-Boot] [RFC 2/3] efi_loader: associate BLK/PARTITION device to efi_disk
AKASHI Takahiro
takahiro.akashi at linaro.org
Wed Jan 30 05:48:52 UTC 2019
On Tue, Jan 29, 2019 at 11:33:31PM +0100, Heinrich Schuchardt wrote:
> On 1/29/19 3:59 AM, AKASHI Takahiro wrote:
> > efi_disk_create() will initialize efi_disk attributes for each device,
> > either UCLASS_BLK or UCLASS_PARTITION.
> >
> > Currently (temporarily), efi_disk_obj structure is embedded into
> > blk_desc to hold efi-specific attributes.
> >
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
> > ---
> > drivers/block/blk-uclass.c | 9 ++
> > drivers/core/device.c | 3 +
> > include/blk.h | 24 +++++
> > include/dm/device.h | 4 +
> > lib/efi_loader/efi_disk.c | 192 ++++++++++++++++++++++++++-----------
> > 5 files changed, 174 insertions(+), 58 deletions(-)
> >
> > diff --git a/drivers/block/blk-uclass.c b/drivers/block/blk-uclass.c
> > index d4ca30f23fc1..28c45d724113 100644
> > --- a/drivers/block/blk-uclass.c
> > +++ b/drivers/block/blk-uclass.c
> > @@ -657,6 +657,9 @@ UCLASS_DRIVER(blk) = {
> > .per_device_platdata_auto_alloc_size = sizeof(struct blk_desc),
> > };
> >
> > +/* FIXME */
> > +extern int efi_disk_create(struct udevice *dev);
> > +
> > U_BOOT_DRIVER(blk_partition) = {
> > .name = "blk_partition",
> > .id = UCLASS_PARTITION,
> > @@ -695,6 +698,12 @@ int blk_create_partitions(struct udevice *parent)
> > part_data->partnum = part;
> > part_data->gpt_part_info = info;
> >
> > + ret = efi_disk_create(dev);
> > + if (ret) {
> > + device_unbind(dev);
> > + return ret;
> > + }
> > +
> > disks++;
> > }
> >
> > diff --git a/drivers/core/device.c b/drivers/core/device.c
> > index 0d15e5062b66..8625fccb0dcb 100644
> > --- a/drivers/core/device.c
> > +++ b/drivers/core/device.c
> > @@ -67,6 +67,9 @@ static int device_bind_common(struct udevice *parent, const struct driver *drv,
> > dev->parent = parent;
> > dev->driver = drv;
> > dev->uclass = uc;
> > +#ifdef CONFIG_EFI_LOADER
> > + INIT_LIST_HEAD(&dev->efi_obj.protocols);
>
> This looks like an incomplete initialization of efi_obj. Why don't we
> use efi_create_handle.
I think that it is more or less a matter of implementation.
I will address this issue later if necessary.
> Why should a device be aware of struct efi_obj? We only need a handle to
> install protocols.
>
> > +#endif
> >
> > dev->seq = -1;
> > dev->req_seq = -1;
> > diff --git a/include/blk.h b/include/blk.h
> > index d0c033aece0f..405f6f790d66 100644
> > --- a/include/blk.h
> > +++ b/include/blk.h
> > @@ -8,6 +8,7 @@
> > #define BLK_H
> >
> > #include <efi.h>
> > +#include <efi_api.h>
> >
> > #ifdef CONFIG_SYS_64BIT_LBA
> > typedef uint64_t lbaint_t;
> > @@ -53,6 +54,26 @@ enum sig_type {
> > SIG_TYPE_COUNT /* Number of signature types */
> > };
> >
> > +/* FIXME */
>
> Fix what?
For simplicity, this data structure was copied from efi_disk.c
in this initial release.
As the implementation goes *sophisticated*, some members may go away
or move somewhere, say in blk_desc itself.
> > +/**
> > + * struct efi_disk_obj - EFI disk object
> > + *
> > + * @ops: EFI disk I/O protocol interface
> > + * @media: block I/O media information
> > + * @dp: device path to the block device
> > + * @part: partition
> > + * @volume: simple file system protocol of the partition
> > + * @offset: offset into disk for simple partition
> > + */
> > +struct efi_disk_obj {
> > + struct efi_block_io ops;
> > + struct efi_block_io_media media;
> > + struct efi_device_path *dp;
> > + unsigned int part;
> > + struct efi_simple_file_system_protocol *volume;
> > + lbaint_t offset;
> > +};
> > +
> > /*
> > * With driver model (CONFIG_BLK) this is uclass platform data, accessible
> > * with dev_get_uclass_platdata(dev)
> > @@ -92,6 +113,9 @@ struct blk_desc {
> > * device. Once these functions are removed we can drop this field.
> > */
> > struct udevice *bdev;
> > +#ifdef CONFIG_EFI_LOADER
> > + struct efi_disk_obj efi_disk;
>
> This must be a handle (i.e. a pointer). Otherwise when the last protocol
> is removed we try to free memory that was never malloc'ed.
Who actually frees?
> > +#endif
> > #else
> > unsigned long (*block_read)(struct blk_desc *block_dev,
> > lbaint_t start,
> > diff --git a/include/dm/device.h b/include/dm/device.h
> > index 27a6d7b9fdb0..121bfb46b1a0 100644
> > --- a/include/dm/device.h
> > +++ b/include/dm/device.h
> > @@ -12,6 +12,7 @@
> >
> > #include <dm/ofnode.h>
> > #include <dm/uclass-id.h>
> > +#include <efi_loader.h>
> > #include <fdtdec.h>
> > #include <linker_lists.h>
> > #include <linux/compat.h>
> > @@ -146,6 +147,9 @@ struct udevice {
> > #ifdef CONFIG_DEVRES
> > struct list_head devres_head;
> > #endif
> > +#ifdef CONFIG_EFI_LOADER
> > + struct efi_object efi_obj;
> > +#endif
> > };
> >
> > /* Maximum sequence number supported */
> > diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c
> > index c037526ad2d0..84fa0ddfba14 100644
> > --- a/lib/efi_loader/efi_disk.c
> > +++ b/lib/efi_loader/efi_disk.c
> > @@ -14,33 +14,6 @@
> >
> > const efi_guid_t efi_block_io_guid = BLOCK_IO_GUID;
> >
> > -/**
> > - * struct efi_disk_obj - EFI disk object
> > - *
> > - * @header: EFI object header
> > - * @ops: EFI disk I/O protocol interface
> > - * @ifname: interface name for block device
> > - * @dev_index: device index of block device
> > - * @media: block I/O media information
> > - * @dp: device path to the block device
> > - * @part: partition
> > - * @volume: simple file system protocol of the partition
> > - * @offset: offset into disk for simple partition
> > - * @desc: internal block device descriptor
> > - */
> > -struct efi_disk_obj {
> > - struct efi_object header;
> > - struct efi_block_io ops;
> > - const char *ifname;
> > - int dev_index;
> > - struct efi_block_io_media media;
> > - struct efi_device_path *dp;
> > - unsigned int part;
> > - struct efi_simple_file_system_protocol *volume;
> > - lbaint_t offset;
> > - struct blk_desc *desc;
> > -};
> > -
> > static efi_status_t EFIAPI efi_disk_reset(struct efi_block_io *this,
> > char extended_verification)
> > {
> > @@ -64,7 +37,7 @@ static efi_status_t efi_disk_rw_blocks(struct efi_block_io *this,
> > unsigned long n;
> >
> > diskobj = container_of(this, struct efi_disk_obj, ops);
> > - desc = (struct blk_desc *) diskobj->desc;
> > + desc = container_of(diskobj, struct blk_desc, efi_disk);
> > blksz = desc->blksz;
> > blocks = buffer_size / blksz;
> > lba += diskobj->offset;
> > @@ -217,6 +190,7 @@ efi_fs_from_path(struct efi_device_path *full_path)
> > return handler->protocol_interface;
> > }
> >
> > +#ifndef CONFIG_BLK
> > /*
> > * Create a handle for a partition or disk
> > *
> > @@ -343,6 +317,136 @@ int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc,
> >
> > return disks;
> > }
> > +#else
> > +static int efi_disk_create_common(efi_handle_t handle,
> > + struct efi_disk_obj *disk,
> > + struct blk_desc *desc)
> > +{
> > + efi_status_t ret;
> > +
> > + /* Hook up to the device list */
> > + efi_add_handle(handle);
> > +
> > + /* Fill in EFI IO Media info (for read/write callbacks) */
> > + disk->media.removable_media = desc->removable;
> > + disk->media.media_present = 1;
> > + disk->media.block_size = desc->blksz;
> > + disk->media.io_align = desc->blksz;
> > + disk->media.last_block = desc->lba - disk->offset;
> > + disk->ops.media = &disk->media;
> > +
> > + /* add protocols */
> > + disk->ops = block_io_disk_template;
> > + ret = efi_add_protocol(handle, &efi_block_io_guid, &disk->ops);
> > + if (ret != EFI_SUCCESS)
> > + goto err;
> > +
> > + ret = efi_add_protocol(handle, &efi_guid_device_path, disk->dp);
> > + if (ret != EFI_SUCCESS)
> > + goto err;
> > +
> > + return 0;
> > +
> > +err:
> > + /* FIXME: undo adding protocols */
> > + return -1;
> > +}
> > +
> > +/*
> > + * Create a handle for a raw disk
> > + *
> > + * @dev uclass device
> > + * @return 0 on success, -1 otherwise
> > + */
> > +int efi_disk_create_raw(struct udevice *dev)
> > +{
> > + struct blk_desc *desc = dev_get_uclass_platdata(dev);
> > + struct efi_disk_obj *disk = &desc->efi_disk;
> > +
> > + /* Don't add empty devices */
> > + if (!desc->lba)
> > + return -1;
> > +
> > + /* raw block device */
> > + disk->offset = 0;
> > + disk->part = 0;
> > + disk->dp = efi_dp_from_part(desc, 0);
> > +
> > + /* efi IO media */
> > + disk->media.logical_partition = 0;
> > +
> > + return efi_disk_create_common(&dev->efi_obj, disk, desc);
> > +}
> > +
> > +/*
> > + * Create a handle for a partition
> > + *
> > + * @dev uclass device
> > + * @return 0 on success, -1 otherwise
> > + */
> > +int efi_disk_create_part(struct udevice *dev)
> > +{
> > + struct udevice *parent = dev->parent;
> > + struct blk_desc *desc = dev_get_uclass_platdata(parent);
> > + struct blk_desc *this;
> > + struct disk_part *pdata = dev_get_uclass_platdata(dev);
> > + struct efi_disk_obj *disk;
> > + struct efi_device_path *node;
> > +
> > + int ret;
> > +
> > + /* dummy block device */
> > + this = malloc(sizeof(*this));
> > + if (!this)
> > + return -1;
> > + disk = &this->efi_disk;
> > +
> > + /* logical disk partition */
> > + disk->offset = pdata->gpt_part_info.start;
> > + disk->part = pdata->partnum;
> > +
> > + node = efi_dp_part_node(desc, disk->part);
> > + disk->dp = efi_dp_append_node(desc->efi_disk.dp, node);
> > + efi_free_pool(node);
> > +
> > + /* efi IO media */
> > + disk->media.logical_partition = 1;
> > +
> > + ret = efi_disk_create_common(&dev->efi_obj, disk, desc);
> > + if (ret)
> > + goto err;
> > +
> > + /* partition may support file system access */
> > + disk->volume = efi_simple_file_system(desc, disk->part, disk->dp);
> > + ret = efi_add_protocol(&dev->efi_obj,
> > + &efi_simple_file_system_protocol_guid,
> > + disk->volume);
> > + if (ret != EFI_SUCCESS)
> > + goto err;
> > +
> > + return 0;
> > +
> > +err:
> > + free(this);
> > + /* FIXME: undo create */
> > +
> > + return -1;
> > +}
> > +
> > +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);
> > + else if (id == UCLASS_PARTITION)
> > + return efi_disk_create_part(dev);
> > + else
> > + return -1;
> > +}
> > +#endif /* CONFIG_BLK */
> >
> > /*
> > * U-Boot doesn't have a list of all online disk devices. So when running our
> > @@ -357,38 +461,10 @@ int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc,
> > */
> > efi_status_t efi_disk_register(void)
> > {
> > +#ifndef CONFIG_BLK
> > struct efi_disk_obj *disk;
> > int disks = 0;
> > efi_status_t ret;
> > -#ifdef CONFIG_BLK
> > - struct udevice *dev;
> > -
> > - for (uclass_first_device_check(UCLASS_BLK, &dev); dev;
> > - uclass_next_device_check(&dev)) {
> > - struct blk_desc *desc = dev_get_uclass_platdata(dev);
> > - const char *if_typename = blk_get_if_type_name(desc->if_type);
> > -
> > - /* Add block device for the full device */
> > - printf("Scanning disk %s...\n", dev->name);
>
> Who cares for this output? If really needed make it debug().
Please note that this is a line to be deleted.
> > - ret = efi_disk_add_dev(NULL, NULL, if_typename,
> > - desc, desc->devnum, 0, 0, &disk);
> > - if (ret == EFI_NOT_READY) {
> > - printf("Disk %s not ready\n", dev->name);
>
> Who minds if it is a CD-ROM drive with no disk inserted? Debug() might
> be adequate here.
Ditto
> > - continue;
> > - }
> > - if (ret) {
> > - printf("ERROR: failure to add disk device %s, r = %lu\n",
> > - dev->name, ret & ~EFI_ERROR_MASK);
> > - return ret;
> > - }
> > - disks++;
> > -
> > - /* Partitions show up as block devices in EFI */
> > - disks += efi_disk_create_partitions(
> > - &disk->header, desc, if_typename,
> > - desc->devnum, dev->name);
> > - }
> > -#else
> > int i, if_type;
> >
> > /* Search for all available disk devices */
> > @@ -435,8 +511,8 @@ efi_status_t efi_disk_register(void)
> > if_typename, i, devname);
> > }
> > }
> > -#endif
> > printf("Found %d disks\n", disks);
>
> I would prefer this to be debug() or eliminated.
I didn't change anything on this line and the function, efi_disk_register(),
will eventually go away.
Thanks,
-Takahiro Akashi
> Best regards
>
> Heinrich
>
> > +#endif
> >
> > return EFI_SUCCESS;
> > }
> >
>
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