From: Pavel Herrmann <morpheus.ibis@gmail.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 01/11] DM: add block device core
Date: Fri, 21 Sep 2012 16:57:41 +0200 [thread overview]
Message-ID: <56183164.uZ3HcVocPu@bloomfield> (raw)
In-Reply-To: <201209211553.26375.marex@denx.de>
On Friday 21 of September 2012 15:53:26 Marek Vasut wrote:
> Dear Pavel Herrmann,
>
> > On Friday 21 of September 2012 14:39:14 Marek Vasut wrote:
> > > Dear Pavel Herrmann,
> > >
> > > > On Thursday 20 of September 2012 21:58:17 Marek Vasut wrote:
> > > > > Dear Pavel Herrmann,
> > > > >
> > > > > > This core will register all block devices (disk, cards, partitons)
> > > > > > and provide unfied access to them, instead of current method with
> > > > > > device + partition offset
> > > > > >
> > > > > > Signed-off-by: Pavel Herrmann <morpheus.ibis@gmail.com>
> > > > > > ---
> > > > > >
> > > > > > Makefile | 1 +
> > > > > > drivers/blockdev/Makefile | 42 ++++++++++++++++
> > > > > > include/dm/blockdev.h | 121
> > > > > >
> > > > > > ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed,
> > > > > > 164
> > > > > > insertions(+)
> > > > > >
> > > > > > create mode 100644 drivers/blockdev/Makefile
> > > > > > create mode 100644 include/dm/blockdev.h
> > > > >
> > > > > Why not use drivers/block/ ?
> > > >
> > > > Because the drivers in drivers/block have a different purpose than
> > > > blockdev.
> > >
> > > Different, ok. Can you elaborate how is it different?
> >
> > blockctrl is equivalent in purpose to drivers/block, just a new approach
> >
> > blockctrl = AHCI, PIIX... whichever chip you have between SATA and PCI (or
> > generally disk-bus and board-bus)
>
> So this is for sata ? Or will it also by used for SD/USB flash discs?
no, blockctrl will be used for SATA, PATA, SCSI, and anything of the sort
(device with several ports, block devices on said ports, ability to send
read/write/query commands to devices on ports - definitely not USB, possibly
also SD, but you probably want more operations from SD)
> > blockdev = disk, partition, SD card
>
> Uh, let's say I understand (even if I don't see the correlation between
> partition and SD card)
they are an ordered bunch of blocks with a "conventional" filesystem on them
> > - something that does basic checks
> > (range, possibility of operation) and submits operations to correct parent
> > (blockctrl, MMC controller, whatnot).
>
> Ascii art might help here greatly (how these pieces fall together). I think
> I do understand it though.
current code
user -> FS -> offset calculation from partition info -> drivers/disk
new code
user -> FS -> blockdev -> blockctrl (or USB or SD controller)
partition blockdev does all the offset calculation and range check that FSs do
now, and then submits the operation to the parent blockdev, which in turn
submits it to blockctrl (or an SD controller in case of a SD card, or USB
controller in case of a USB flash)
Pavel Herrmann
next prev parent reply other threads:[~2012-09-21 14:57 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-20 19:37 [U-Boot] [PATCH 00/11] Add DM blockdev subsystem Pavel Herrmann
2012-09-20 19:37 ` [U-Boot] [PATCH 01/11] DM: add block device core Pavel Herrmann
2012-09-20 19:58 ` Marek Vasut
2012-09-21 7:11 ` Pavel Herrmann
2012-09-21 12:39 ` Marek Vasut
2012-09-21 13:27 ` Pavel Herrmann
2012-09-21 13:53 ` Marek Vasut
2012-09-21 14:57 ` Pavel Herrmann [this message]
2012-09-21 15:34 ` Marek Vasut
2012-09-21 15:48 ` Pavel Herrmann
2012-09-21 15:55 ` Marek Vasut
2012-09-21 17:19 ` Pavel Herrmann
2012-09-21 18:00 ` Marek Vasut
2012-09-21 18:53 ` Pavel Herrmann
2012-09-21 19:17 ` Marek Vasut
2012-09-21 19:29 ` Pavel Herrmann
2012-09-21 21:11 ` Marek Vasut
2012-09-21 23:43 ` Pavel Herrmann
2012-09-22 0:09 ` Marek Vasut
2012-09-22 9:39 ` Pavel Herrmann
2012-09-22 13:33 ` Marek Vasut
2012-09-22 13:59 ` Pavel Herrmann
2012-09-24 12:23 ` Pavel Herrmann
2012-09-20 20:49 ` [U-Boot] [U-Boot-DM] " Vikram Narayanan
2012-09-21 7:09 ` Pavel Herrmann
2012-09-21 12:39 ` Marek Vasut
2012-09-20 19:37 ` [U-Boot] [PATCH 02/11] DM: add support for scanning DOS partitions to blockdev core Pavel Herrmann
2012-09-20 20:03 ` Marek Vasut
2012-09-21 7:22 ` Pavel Herrmann
2012-09-21 12:47 ` Marek Vasut
2012-09-21 13:18 ` Pavel Herrmann
2012-09-21 13:54 ` Marek Vasut
2012-09-20 19:37 ` [U-Boot] [PATCH 03/11] DM: add block controller core Pavel Herrmann
2012-09-20 20:05 ` Marek Vasut
2012-09-21 7:21 ` Pavel Herrmann
2012-09-21 12:51 ` Marek Vasut
2012-09-21 13:14 ` Pavel Herrmann
2012-09-21 13:56 ` Marek Vasut
2012-09-21 15:04 ` Pavel Herrmann
2012-09-21 13:33 ` Pavel Herrmann
2012-09-21 13:58 ` Marek Vasut
2012-09-21 15:09 ` Pavel Herrmann
2012-09-21 15:39 ` Marek Vasut
2012-09-21 15:46 ` Pavel Herrmann
2012-09-21 16:08 ` Marek Vasut
2012-09-21 17:22 ` Pavel Herrmann
2012-09-21 18:01 ` Marek Vasut
2012-09-21 19:15 ` Pavel Herrmann
2012-09-21 19:22 ` Marek Vasut
2012-09-20 19:37 ` [U-Boot] [PATCH 04/11] DM: add sata_legacy driver for blockctrl Pavel Herrmann
2012-09-20 19:37 ` [U-Boot] [PATCH 05/11] DM: add ata and partition blockdev drivers Pavel Herrmann
2012-09-20 19:37 ` [U-Boot] [PATCH 06/11] DM: add cmd_block command Pavel Herrmann
2012-09-20 19:37 ` [U-Boot] [PATCH 07/11] DM: use new blockdev API in FAT Pavel Herrmann
2012-09-20 19:37 ` [U-Boot] [PATCH 08/11] DM: use new blockdev API in ext2 Pavel Herrmann
2012-09-20 19:37 ` [U-Boot] [PATCH 09/11] DM: use new blockdev API in reiserfs Pavel Herrmann
2012-09-20 19:37 ` [U-Boot] [PATCH 10/11] DM: use new blockdev API in ZFS Pavel Herrmann
2012-09-20 19:37 ` [U-Boot] [PATCH 11/11] DM: switch sandbox to DM blockdev Pavel Herrmann
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