[U-Boot] [PATCH 1/1] efi_driver: set block size for EFI block device

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

On Fri, Oct 25, 2019 at 08:37:11AM +0200, Heinrich Schuchardt wrote:
> On 10/25/19 6:34 AM, AKASHI Takahiro wrote:
> >On Thu, Oct 24, 2019 at 08:49:00PM +0000, Heinrich Schuchardt wrote:
> >>Copy the block size from the block IO protocol to the U-Boot block device
> >>descriptor. This information is used by the ext4 file system driver.
> >>
> >>Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
> >>---
> >>  lib/efi_driver/efi_block_device.c | 6 ++++++
> >>  1 file changed, 6 insertions(+)
> >>
> >>diff --git a/lib/efi_driver/efi_block_device.c b/lib/efi_driver/efi_block_device.c
> >>index cf02341931..9de526a95b 100644
> >>--- a/lib/efi_driver/efi_block_device.c
> >>+++ b/lib/efi_driver/efi_block_device.c
> >>@@ -137,6 +137,7 @@ static int efi_bl_bind(efi_handle_t handle, void *interface)
> >>  	struct efi_block_io *io = interface;
> >>  	int disks;
> >>  	struct efi_blk_platdata *platdata;
> >>+	struct blk_desc *desc;
> >>
> >>  	EFI_PRINT("%s: handle %p, interface %p\n", __func__, handle, io);
> >>
> >>@@ -174,6 +175,11 @@ static int efi_bl_bind(efi_handle_t handle, void *interface)
> >>  		return ret;
> >>  	EFI_PRINT("%s: block device '%s' created\n", __func__, bdev->name);
> >>
> >>+	/* Set block size */
> >>+	desc = dev_get_uclass_platdata(bdev);
> >>+	desc->blksz = io->media->block_size;
> >>+	desc->log2blksz = LOG2(desc->blksz);
> >
> >I don't think that this is the best place to put them.
> >Better to initialise log2blksz in blk_create_device().
> 
> desc->blksz can only be set in the EFI code because it is only here that
> we know the block size.
> 
> log2blksz is currently set in:
> 
> common/usb_storage.c:1491
> drivers/scsi/scsi.c:548
> drivers/mmc/mmc.c:2586
> drivers/block/ide.c:485
> drivers/block/ide.c:530
> drivers/block/ide.c:688
> drivers/ata/sata.c:100
> drivers/nvme/nvme.c:681
> disk/part.c:560
> disk/part.c:637
> 
> blk_create_device() is only called if a board uses the driver model
> which unfortunately isn't true for all boards.

?
efi_bl_bind() always calls blk_create_device().
Modifying blk_create_device() should work for EFI.

Yes, there are couple of places to set log2blksz in drivers.
But if any of them sets log2blksz to anything but LOG2(desc->blksz),
it is a bug.
You should clean them up before your patch.
(As in the case that you have suggested me before)
Don't increase local hacks.

-Takahiro Akashi


> Once all boards use CONFIG_DM and CONFIG_BLK we can clean up the code.
> 
> Best regards
> 
> Heinrich
> 
> >
> >-Takahiro Akashi
> >
> >
> >>  	/* Create handles for the partions of the block device */
> >>  	disks = efi_bl_bind_partitions(handle, bdev);
> >>  	EFI_PRINT("Found %d partitions\n", disks);
> >>--
> >>2.20.1
> >>
> >
>