From: Oliver Neukum <oliver@neukum.org>
To: "Shilimkar, Santosh" <santosh.shilimkar@ti.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Pavel Machek <pavel@ucw.cz>, Greg KH <greg@kroah.com>,
"Russell King - ARM Linux" <linux@arm.linux.org.uk>,
Matthew Dharm <mdharm-kernel@one-eyed-alien.net>,
Sergei Shtylyov <sshtylyov@ru.mvista.com>,
Ming Lei <tom.leiming@gmail.com>,
Sebastian Siewior <bigeasy@linutronix.de>,
"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
"linux-kernel" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel" <linux-arm-kernel@lists.infradead.org>,
"Mankad, Maulik Ojas" <x0082077@ti.com>
Subject: Re: USB mass storage and ARM cache coherency
Date: Tue, 16 Feb 2010 09:22:47 +0100 [thread overview]
Message-ID: <201002160922.47072.oliver@neukum.org> (raw)
In-Reply-To: <EAF47CD23C76F840A9E7FCE10091EFAB02C3CF7D50@dbde02.ent.ti.com>
Am Dienstag, 16. Februar 2010 08:57:53 schrieb Shilimkar, Santosh:
> Continuing on the USB issue w.r.t cache coherency, the usb host
> code is violating the buffer ownership rules of streaming APIs from
> dma and non-dma transfers point if view.
>
> We have a below temporary patch to get around the issue and probably it
> needs to be fixed in the right way in the stack because some controllers
> may not have PIO option even for control transfers. (e.g. Synopsis EHCI
> controller)
This seems wrong to me. Buffers for control transfers may be transfered
by DMA, so the caches must be flushed on architectures whose caches
are not coherent with respect to DMA.
Would you care to elaborate on the exact nature of the bug you are fixing?
Regards
Oliver
next prev parent reply other threads:[~2010-02-16 8:22 UTC|newest]
Thread overview: 193+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-29 14:34 Catalin Marinas
2010-01-29 16:10 ` Oliver Neukum
2010-01-29 16:23 ` Ming Lei
2010-01-29 16:34 ` Catalin Marinas
2010-01-29 16:41 ` Oliver Neukum
2010-01-29 17:14 ` Catalin Marinas
2010-01-29 17:51 ` Sergei Shtylyov
2010-01-29 18:54 ` Matthew Dharm
2010-01-29 19:35 ` Greg KH
2010-02-01 13:49 ` Catalin Marinas
2010-02-01 17:29 ` Catalin Marinas
2010-02-01 20:14 ` Alan Stern
2010-02-02 4:24 ` Paul Mundt
2010-02-02 9:58 ` Catalin Marinas
2010-02-01 22:30 ` Andreas Mohr
2010-02-02 6:58 ` Oliver Neukum
2010-02-02 9:31 ` Florian Fainelli
2010-02-02 6:39 ` Paul Mundt
2010-02-02 11:05 ` Catalin Marinas
2010-02-02 11:15 ` Paul Mundt
2010-02-02 9:11 ` Sebastian Andrzej Siewior
2010-02-02 11:09 ` Catalin Marinas
2010-02-02 11:48 ` Oliver Neukum
2010-02-02 12:01 ` Catalin Marinas
2010-02-02 12:07 ` Oliver Neukum
2010-02-02 12:11 ` Andreas Mohr
2010-02-02 14:42 ` Clemens Ladisch
2010-02-02 14:52 ` Oliver Neukum
2010-02-02 15:10 ` Andreas Mohr
2010-02-02 15:34 ` Catalin Marinas
2010-02-02 20:38 ` Andreas Mohr
2010-02-02 12:39 ` Catalin Marinas
2010-02-02 13:08 ` Oliver Neukum
2010-02-02 14:34 ` Catalin Marinas
2010-02-02 17:11 ` Alan Stern
2010-02-02 17:20 ` Catalin Marinas
2010-02-02 21:52 ` Andreas Mohr
2010-02-03 15:15 ` Alan Stern
2010-02-08 6:55 ` Pavel Machek
2010-02-02 13:36 ` Ming Lei
2010-02-02 14:35 ` Catalin Marinas
2010-02-08 6:55 ` Pavel Machek
2010-02-08 7:33 ` Andreas Mohr
2010-02-08 10:19 ` Catalin Marinas
2010-02-08 9:51 ` Catalin Marinas
2010-02-08 10:03 ` Andy Green
2010-02-17 9:50 ` Sascha Hauer
2010-02-17 9:57 ` Andy Green
2010-02-08 10:52 ` Pavel Machek
2010-02-08 11:28 ` Catalin Marinas
2010-02-16 7:57 ` Shilimkar, Santosh
2010-02-16 8:22 ` Oliver Neukum [this message]
2010-02-16 8:55 ` Shilimkar, Santosh
2010-02-16 9:07 ` Oliver Neukum
2010-02-16 9:39 ` Russell King - ARM Linux
2010-02-16 13:32 ` Oliver Neukum
2010-02-16 13:40 ` Shilimkar, Santosh
2010-02-16 13:46 ` Oliver Neukum
2010-02-16 14:12 ` Shilimkar, Santosh
2010-02-16 14:22 ` Oliver Neukum
2010-02-16 14:45 ` Shilimkar, Santosh
2010-02-16 15:44 ` Alan Stern
2010-02-17 8:55 ` Shilimkar, Santosh
2010-02-17 9:10 ` Oliver Neukum
2010-02-17 9:17 ` Shilimkar, Santosh
2010-02-17 17:02 ` Alan Stern
2010-02-17 20:26 ` Russell King - ARM Linux
2010-02-17 20:30 ` Gadiyar, Anand
2010-02-18 6:56 ` Oliver Neukum
2010-02-18 7:14 ` Gadiyar, Anand
2010-02-17 12:29 ` Jamie Lokier
2010-02-17 3:21 ` Ming Lei
2010-02-17 9:05 ` Benjamin Herrenschmidt
2010-02-17 9:15 ` Oliver Neukum
2010-02-17 9:40 ` Benjamin Herrenschmidt
2010-02-17 10:09 ` Oliver Neukum
2010-02-17 10:18 ` Benjamin Herrenschmidt
2010-02-17 10:23 ` Oliver Neukum
2010-02-17 12:15 ` Benjamin Herrenschmidt
2010-02-17 9:55 ` Russell King - ARM Linux
2010-02-17 10:05 ` Benjamin Herrenschmidt
2010-02-17 15:27 ` Catalin Marinas
2010-02-17 20:37 ` Benjamin Herrenschmidt
2010-02-17 20:44 ` Russell King - ARM Linux
2010-02-17 22:31 ` Benjamin Herrenschmidt
2010-02-19 17:15 ` Catalin Marinas
2010-02-19 17:36 ` Catalin Marinas
2010-02-19 20:53 ` Oliver Neukum
2010-02-24 2:48 ` Benjamin Herrenschmidt
2010-02-24 7:16 ` Oliver Neukum
2010-02-24 21:12 ` Benjamin Herrenschmidt
2010-02-25 3:48 ` Oliver Neukum
2010-02-26 0:22 ` Benjamin Herrenschmidt
2010-02-25 12:36 ` James Bottomley
2010-02-24 2:47 ` Benjamin Herrenschmidt
2010-02-24 16:19 ` Alan Stern
2010-02-24 21:13 ` Benjamin Herrenschmidt
2010-02-24 21:50 ` Alan Stern
2010-02-25 20:52 ` Benjamin Herrenschmidt
2010-02-26 16:00 ` Catalin Marinas
2010-02-26 21:36 ` Benjamin Herrenschmidt
2010-02-26 16:25 ` Catalin Marinas
2010-02-26 16:52 ` Alan Stern
2010-02-26 21:51 ` Benjamin Herrenschmidt
2010-02-26 21:00 ` Russell King - ARM Linux
2010-02-28 0:14 ` Benjamin Herrenschmidt
2010-02-28 5:01 ` James Bottomley
2010-03-01 10:39 ` Catalin Marinas
2010-03-01 11:06 ` Russell King - ARM Linux
2010-03-02 12:11 ` FUJITA Tomonori
2010-03-02 17:05 ` Catalin Marinas
2010-03-02 17:47 ` Catalin Marinas
2010-03-02 23:33 ` Benjamin Herrenschmidt
2010-03-03 10:21 ` Catalin Marinas
2010-03-02 23:29 ` Benjamin Herrenschmidt
2010-03-03 3:47 ` FUJITA Tomonori
2010-03-03 5:10 ` Benjamin Herrenschmidt
2010-03-03 5:40 ` James Bottomley
2010-03-03 9:36 ` Russell King - ARM Linux
2010-03-03 10:24 ` James Bottomley
2010-03-03 19:41 ` Russell King - ARM Linux
2010-03-04 2:00 ` Benjamin Herrenschmidt
2010-03-04 8:26 ` James Bottomley
2010-03-04 21:25 ` Benjamin Herrenschmidt
2010-03-03 6:35 ` FUJITA Tomonori
2010-03-03 10:43 ` Catalin Marinas
2010-03-03 10:40 ` Catalin Marinas
2010-03-03 21:54 ` Pavel Machek
2010-03-04 13:35 ` Catalin Marinas
2010-03-04 13:51 ` Pavel Machek
2010-03-04 14:21 ` James Bottomley
2010-03-04 14:27 ` Russell King - ARM Linux
2010-03-04 15:25 ` Catalin Marinas
2010-03-04 15:34 ` Russell King - ARM Linux
2010-03-04 21:31 ` Benjamin Herrenschmidt
2010-03-06 10:47 ` James Bottomley
2010-03-06 19:36 ` Russell King - ARM Linux
2010-03-06 21:07 ` Benjamin Herrenschmidt
2010-03-07 5:54 ` James Bottomley
2010-03-08 11:17 ` Catalin Marinas
2010-03-06 21:03 ` Benjamin Herrenschmidt
2010-03-07 3:37 ` James Bottomley
2010-03-08 8:46 ` FUJITA Tomonori
2010-03-09 2:25 ` Benjamin Herrenschmidt
2010-03-04 15:29 ` Catalin Marinas
2010-03-04 15:41 ` Paul Mundt
2010-03-04 16:30 ` Russell King - ARM Linux
2010-03-04 17:34 ` Catalin Marinas
2010-03-04 17:54 ` Russell King - ARM Linux
2010-03-04 22:27 ` Andreas Mohr
2010-03-04 18:07 ` Catalin Marinas
2010-03-04 21:37 ` Benjamin Herrenschmidt
2010-03-04 22:11 ` Catalin Marinas
2010-03-05 4:34 ` Benjamin Herrenschmidt
2010-03-05 9:27 ` Catalin Marinas
2010-03-05 1:17 ` Paul Mundt
2010-03-05 4:44 ` Benjamin Herrenschmidt
2010-03-10 3:52 ` Paul Mundt
2010-03-11 21:44 ` Benjamin Herrenschmidt
2010-03-04 21:34 ` Benjamin Herrenschmidt
2010-03-04 21:28 ` Benjamin Herrenschmidt
2010-03-04 21:40 ` Russell King - ARM Linux
2010-03-05 4:31 ` Benjamin Herrenschmidt
2010-03-04 15:35 ` Catalin Marinas
2010-03-07 8:23 ` Pavel Machek
2010-03-08 10:57 ` Catalin Marinas
2010-03-02 23:26 ` Benjamin Herrenschmidt
2010-03-01 10:42 ` Catalin Marinas
2010-03-03 20:24 ` Jamie Lokier
2010-02-26 21:40 ` Benjamin Herrenschmidt
2010-02-26 21:49 ` Russell King - ARM Linux
2010-02-28 0:24 ` Benjamin Herrenschmidt
2010-02-28 19:17 ` Pavel Machek
2010-03-01 11:10 ` Catalin Marinas
2010-03-02 4:11 ` Benjamin Herrenschmidt
2010-02-24 2:39 ` Benjamin Herrenschmidt
2010-02-26 16:44 ` Catalin Marinas
2010-02-26 21:49 ` Benjamin Herrenschmidt
2010-02-26 22:03 ` Russell King - ARM Linux
2010-02-28 0:29 ` Benjamin Herrenschmidt
2010-02-28 23:20 ` Catalin Marinas
2010-02-28 23:17 ` Catalin Marinas
2010-02-17 15:27 ` Catalin Marinas
2010-02-17 15:39 ` Catalin Marinas
2010-02-17 15:40 ` Catalin Marinas
2010-02-17 15:40 ` Catalin Marinas
2010-02-17 16:19 ` Catalin Marinas
2010-02-17 16:19 ` Catalin Marinas
2010-02-16 8:44 ` Russell King - ARM Linux
2010-02-16 8:51 ` Gadiyar, Anand
2010-02-20 7:21 ` Pete Zaitcev
2010-02-03 23:56 George Spelvin
2010-02-04 4:39 ` Paul Mundt
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