From: Catalin Marinas <catalin.marinas@arm.com> To: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Oliver Neukum <oliver@neukum.org>, "Shilimkar, Santosh" <santosh.shilimkar@ti.com>, Matthew Dharm <mdharm-kernel@one-eyed-alien.net>, Russell King - ARM Linux <linux@arm.linux.org.uk>, Ming Lei <tom.leiming@gmail.com>, "Mankad, Maulik Ojas" <x0082077@ti.com>, Sergei Shtylyov <sshtylyov@ru.mvista.com>, Sebastian Siewior <bigeasy@linutronix.de>, "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>, linux-kernel <linux-kernel@vger.kernel.org>, Pavel Machek <pavel@ucw.cz>, Greg KH <greg@kroah.com>, linux-arm-kernel <linux-arm-kernel@lists.infradead.org> Subject: Re: USB mass storage and ARM cache coherency Date: Wed, 17 Feb 2010 15:27:55 +0000 [thread overview] Message-ID: <1266420475.16707.31.camel@e102109-lin.cambridge.arm.com> (raw) In-Reply-To: <1266397543.16346.264.camel@pasglop> On Wed, 2010-02-17 at 20:05 +1100, Benjamin Herrenschmidt wrote: > On Tue, 2010-02-16 at 09:22 +0100, Oliver Neukum wrote: > > 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? > > I missed part of this thread, so forgive me if I'm a bit off here, but > if the problem is indeed I$/D$ cache coherency vs. PIO transfers, then > this is a long solved issue on other archs such as ppc (and I _think_ > sparc). The thread I started was indeed regarding I/D cache coherency and PIO. But it diverged into DMA issues a few days ago (should have been a new thread). > The way we do it, at least on powerpc which is PIPT, is to keep track on > a per-page basis, whether a given page is clean for execution using > PG_arch1 bit. This bit is cleared when a new page is popped into the > page cache, and we clear it from flush_dcache_page() iirc (you may want > to dbl check I don't have the code at hand right now, or rather, I do > but I'm to lazy to look right now :-) We do the same on ARM. The problem with most (all) HCD drivers that do PIO is that they copy the data to the transfer buffer but there is no call in this driver to flush_dcache_page(). The upper mass storage or filesystem layers don't call this function either, so there isn't anything that would set the PG_arch1 bit. -- Catalin
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From: catalin.marinas@arm.com (Catalin Marinas) To: linux-arm-kernel@lists.infradead.org Subject: USB mass storage and ARM cache coherency Date: Wed, 17 Feb 2010 15:27:55 +0000 [thread overview] Message-ID: <1266420475.16707.31.camel@e102109-lin.cambridge.arm.com> (raw) In-Reply-To: <1266397543.16346.264.camel@pasglop> On Wed, 2010-02-17 at 20:05 +1100, Benjamin Herrenschmidt wrote: > On Tue, 2010-02-16 at 09:22 +0100, Oliver Neukum wrote: > > 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? > > I missed part of this thread, so forgive me if I'm a bit off here, but > if the problem is indeed I$/D$ cache coherency vs. PIO transfers, then > this is a long solved issue on other archs such as ppc (and I _think_ > sparc). The thread I started was indeed regarding I/D cache coherency and PIO. But it diverged into DMA issues a few days ago (should have been a new thread). > The way we do it, at least on powerpc which is PIPT, is to keep track on > a per-page basis, whether a given page is clean for execution using > PG_arch1 bit. This bit is cleared when a new page is popped into the > page cache, and we clear it from flush_dcache_page() iirc (you may want > to dbl check I don't have the code at hand right now, or rather, I do > but I'm to lazy to look right now :-) We do the same on ARM. The problem with most (all) HCD drivers that do PIO is that they copy the data to the transfer buffer but there is no call in this driver to flush_dcache_page(). The upper mass storage or filesystem layers don't call this function either, so there isn't anything that would set the PG_arch1 bit. -- Catalin
next prev parent reply other threads:[~2010-02-17 15:28 UTC|newest] Thread overview: 352+ messages / expand[flat|nested] mbox.gz Atom feed top 2010-01-29 14:34 USB mass storage and ARM cache coherency 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 6:55 ` Pavel Machek 2010-02-08 7:33 ` Andreas Mohr 2010-02-08 7:33 ` Andreas Mohr 2010-02-08 10:19 ` Catalin Marinas 2010-02-08 10:19 ` Catalin Marinas 2010-02-08 9:51 ` Catalin Marinas 2010-02-08 9:51 ` Catalin Marinas 2010-02-08 10:03 ` Andy Green 2010-02-08 10:03 ` Andy Green 2010-02-17 9:50 ` Sascha Hauer 2010-02-17 9:50 ` Sascha Hauer 2010-02-17 9:57 ` Andy Green 2010-02-17 9:57 ` Andy Green 2010-02-08 10:52 ` Pavel Machek 2010-02-08 10:52 ` Pavel Machek 2010-02-08 11:28 ` Catalin Marinas 2010-02-08 11:28 ` Catalin Marinas 2010-02-16 7:57 ` Shilimkar, Santosh 2010-02-16 7:57 ` Shilimkar, Santosh 2010-02-16 8:22 ` Oliver Neukum 2010-02-16 8:22 ` Oliver Neukum 2010-02-16 8:55 ` Shilimkar, Santosh 2010-02-16 8:55 ` Shilimkar, Santosh 2010-02-16 9:07 ` Oliver Neukum 2010-02-16 9:07 ` Oliver Neukum 2010-02-16 9:39 ` Russell King - ARM Linux 2010-02-16 9:39 ` Russell King - ARM Linux 2010-02-16 13:32 ` Oliver Neukum 2010-02-16 13:32 ` Oliver Neukum 2010-02-16 13:40 ` Shilimkar, Santosh 2010-02-16 13:40 ` Shilimkar, Santosh 2010-02-16 13:46 ` Oliver Neukum 2010-02-16 13:46 ` Oliver Neukum 2010-02-16 14:12 ` Shilimkar, Santosh 2010-02-16 14:12 ` Shilimkar, Santosh 2010-02-16 14:22 ` Oliver Neukum 2010-02-16 14:22 ` Oliver Neukum 2010-02-16 14:45 ` Shilimkar, Santosh 2010-02-16 14:45 ` Shilimkar, Santosh 2010-02-16 15:44 ` Alan Stern 2010-02-16 15:44 ` Alan Stern 2010-02-17 8:55 ` Shilimkar, Santosh 2010-02-17 8:55 ` Shilimkar, Santosh 2010-02-17 9:10 ` Oliver Neukum 2010-02-17 9:10 ` Oliver Neukum 2010-02-17 9:17 ` Shilimkar, Santosh 2010-02-17 9:17 ` Shilimkar, Santosh 2010-02-17 17:02 ` Alan Stern 2010-02-17 17:02 ` Alan Stern 2010-02-17 20:26 ` Russell King - ARM Linux 2010-02-17 20:26 ` Russell King - ARM Linux 2010-02-17 20:30 ` Gadiyar, Anand 2010-02-17 20:30 ` Gadiyar, Anand 2010-02-18 6:56 ` Oliver Neukum 2010-02-18 6:56 ` Oliver Neukum 2010-02-18 7:14 ` Gadiyar, Anand 2010-02-18 7:14 ` Gadiyar, Anand 2010-02-17 12:29 ` Jamie Lokier 2010-02-17 12:29 ` Jamie Lokier 2010-02-17 3:21 ` Ming Lei 2010-02-17 3:21 ` Ming Lei 2010-02-17 9:05 ` Benjamin Herrenschmidt 2010-02-17 9:05 ` Benjamin Herrenschmidt 2010-02-17 9:15 ` Oliver Neukum 2010-02-17 9:15 ` Oliver Neukum 2010-02-17 9:40 ` Benjamin Herrenschmidt 2010-02-17 9:40 ` Benjamin Herrenschmidt 2010-02-17 10:09 ` Oliver Neukum 2010-02-17 10:09 ` Oliver Neukum 2010-02-17 10:18 ` Benjamin Herrenschmidt 2010-02-17 10:18 ` Benjamin Herrenschmidt 2010-02-17 10:23 ` Oliver Neukum 2010-02-17 10:23 ` Oliver Neukum 2010-02-17 12:15 ` Benjamin Herrenschmidt 2010-02-17 12:15 ` Benjamin Herrenschmidt 2010-02-17 9:55 ` Russell King - ARM Linux 2010-02-17 9:55 ` Russell King - ARM Linux 2010-02-17 10:05 ` Benjamin Herrenschmidt 2010-02-17 10:05 ` Benjamin Herrenschmidt 2010-02-17 15:27 ` Catalin Marinas [this message] 2010-02-17 15:27 ` Catalin Marinas 2010-02-17 20:37 ` Benjamin Herrenschmidt 2010-02-17 20:37 ` Benjamin Herrenschmidt 2010-02-17 20:44 ` Russell King - ARM Linux 2010-02-17 20:44 ` Russell King - ARM Linux 2010-02-17 22:31 ` Benjamin Herrenschmidt 2010-02-17 22:31 ` Benjamin Herrenschmidt 2010-02-19 17:15 ` Catalin Marinas 2010-02-19 17:15 ` Catalin Marinas 2010-02-19 17:36 ` Catalin Marinas 2010-02-19 17:36 ` Catalin Marinas 2010-02-19 20:53 ` Oliver Neukum 2010-02-19 20:53 ` Oliver Neukum 2010-02-24 2:48 ` Benjamin Herrenschmidt 2010-02-24 2:48 ` Benjamin Herrenschmidt 2010-02-24 7:16 ` Oliver Neukum 2010-02-24 7:16 ` Oliver Neukum 2010-02-24 21:12 ` Benjamin Herrenschmidt 2010-02-24 21:12 ` Benjamin Herrenschmidt 2010-02-25 3:48 ` Oliver Neukum 2010-02-25 3:48 ` Oliver Neukum 2010-02-26 0:22 ` Benjamin Herrenschmidt 2010-02-26 0:22 ` Benjamin Herrenschmidt 2010-02-25 12:36 ` James Bottomley 2010-02-25 12:36 ` James Bottomley 2010-02-24 2:47 ` Benjamin Herrenschmidt 2010-02-24 2:47 ` Benjamin Herrenschmidt 2010-02-24 16:19 ` Alan Stern 2010-02-24 16:19 ` Alan Stern 2010-02-24 21:13 ` Benjamin Herrenschmidt 2010-02-24 21:13 ` Benjamin Herrenschmidt 2010-02-24 21:50 ` Alan Stern 2010-02-24 21:50 ` Alan Stern 2010-02-25 20:52 ` Benjamin Herrenschmidt 2010-02-25 20:52 ` Benjamin Herrenschmidt 2010-02-26 16:00 ` Catalin Marinas 2010-02-26 16:00 ` Catalin Marinas 2010-02-26 21:36 ` Benjamin Herrenschmidt 2010-02-26 21:36 ` Benjamin Herrenschmidt 2010-02-26 16:25 ` Catalin Marinas 2010-02-26 16:25 ` Catalin Marinas 2010-02-26 16:52 ` Alan Stern 2010-02-26 16:52 ` Alan Stern 2010-02-26 21:51 ` Benjamin Herrenschmidt 2010-02-26 21:51 ` Benjamin Herrenschmidt 2010-02-26 21:00 ` Russell King - ARM Linux 2010-02-26 21:00 ` Russell King - ARM Linux 2010-02-28 0:14 ` Benjamin Herrenschmidt 2010-02-28 0:14 ` Benjamin Herrenschmidt 2010-02-28 5:01 ` James Bottomley 2010-02-28 5:01 ` James Bottomley 2010-03-01 10:39 ` Catalin Marinas 2010-03-01 10:39 ` Catalin Marinas 2010-03-01 11:06 ` Russell King - ARM Linux 2010-03-01 11:06 ` Russell King - ARM Linux 2010-03-02 12:11 ` FUJITA Tomonori 2010-03-02 12:11 ` FUJITA Tomonori 2010-03-02 17:05 ` Catalin Marinas 2010-03-02 17:05 ` Catalin Marinas 2010-03-02 17:47 ` Catalin Marinas 2010-03-02 17:47 ` Catalin Marinas 2010-03-02 23:33 ` Benjamin Herrenschmidt 2010-03-02 23:33 ` Benjamin Herrenschmidt 2010-03-03 10:21 ` Catalin Marinas 2010-03-03 10:21 ` Catalin Marinas 2010-03-02 23:29 ` Benjamin Herrenschmidt 2010-03-02 23:29 ` Benjamin Herrenschmidt 2010-03-03 3:47 ` FUJITA Tomonori 2010-03-03 3:47 ` FUJITA Tomonori 2010-03-03 5:10 ` Benjamin Herrenschmidt 2010-03-03 5:10 ` Benjamin Herrenschmidt 2010-03-03 5:40 ` James Bottomley 2010-03-03 5:40 ` James Bottomley 2010-03-03 9:36 ` Russell King - ARM Linux 2010-03-03 9:36 ` Russell King - ARM Linux 2010-03-03 10:24 ` James Bottomley 2010-03-03 10:24 ` James Bottomley 2010-03-03 19:41 ` Russell King - ARM Linux 2010-03-03 19:41 ` Russell King - ARM Linux 2010-03-04 2:00 ` Benjamin Herrenschmidt 2010-03-04 2:00 ` Benjamin Herrenschmidt 2010-03-04 8:26 ` James Bottomley 2010-03-04 8:26 ` James Bottomley 2010-03-04 21:25 ` Benjamin Herrenschmidt 2010-03-04 21:25 ` Benjamin Herrenschmidt 2010-03-03 6:35 ` FUJITA Tomonori 2010-03-03 6:35 ` FUJITA Tomonori 2010-03-03 10:43 ` Catalin Marinas 2010-03-03 10:43 ` Catalin Marinas 2010-03-03 10:40 ` Catalin Marinas 2010-03-03 10:40 ` Catalin Marinas 2010-03-03 21:54 ` Pavel Machek 2010-03-03 21:54 ` Pavel Machek 2010-03-04 6:54 ` Wolfgang Mües 2010-03-04 9:31 ` Russell King - ARM Linux 2010-03-06 10:56 ` Wolfgang Mües 2010-03-06 11:05 ` Oliver Neukum 2010-03-06 19:44 ` Russell King - ARM Linux 2010-03-04 13:47 ` Catalin Marinas 2010-03-04 13:35 ` Catalin Marinas 2010-03-04 13:35 ` Catalin Marinas 2010-03-04 13:51 ` Pavel Machek 2010-03-04 13:51 ` Pavel Machek 2010-03-04 14:21 ` James Bottomley 2010-03-04 14:21 ` James Bottomley 2010-03-04 14:27 ` Russell King - ARM Linux 2010-03-04 14:27 ` Russell King - ARM Linux 2010-03-04 15:25 ` Catalin Marinas 2010-03-04 15:25 ` Catalin Marinas 2010-03-04 15:34 ` Russell King - ARM Linux 2010-03-04 15:34 ` Russell King - ARM Linux 2010-03-04 21:31 ` Benjamin Herrenschmidt 2010-03-04 21:31 ` Benjamin Herrenschmidt 2010-03-06 10:47 ` James Bottomley 2010-03-06 10:47 ` James Bottomley 2010-03-06 19:36 ` Russell King - ARM Linux 2010-03-06 19:36 ` Russell King - ARM Linux 2010-03-06 21:07 ` Benjamin Herrenschmidt 2010-03-06 21:07 ` Benjamin Herrenschmidt 2010-03-07 5:54 ` James Bottomley 2010-03-07 5:54 ` James Bottomley 2010-03-08 11:17 ` Catalin Marinas 2010-03-08 11:17 ` Catalin Marinas 2010-03-06 21:03 ` Benjamin Herrenschmidt 2010-03-06 21:03 ` Benjamin Herrenschmidt 2010-03-07 3:37 ` James Bottomley 2010-03-07 3:37 ` James Bottomley 2010-03-08 8:46 ` FUJITA Tomonori 2010-03-08 8:46 ` FUJITA Tomonori 2010-03-09 2:25 ` Benjamin Herrenschmidt 2010-03-09 2:25 ` Benjamin Herrenschmidt 2010-03-04 15:29 ` Catalin Marinas 2010-03-04 15:29 ` Catalin Marinas 2010-03-04 15:41 ` Paul Mundt 2010-03-04 15:41 ` Paul Mundt 2010-03-04 16:30 ` Russell King - ARM Linux 2010-03-04 16:30 ` Russell King - ARM Linux 2010-03-04 17:34 ` Catalin Marinas 2010-03-04 17:34 ` Catalin Marinas 2010-03-04 17:54 ` Russell King - ARM Linux 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 18:07 ` Catalin Marinas 2010-03-04 21:37 ` Benjamin Herrenschmidt 2010-03-04 21:37 ` Benjamin Herrenschmidt 2010-03-04 22:11 ` Catalin Marinas 2010-03-04 22:11 ` Catalin Marinas 2010-03-05 4:34 ` Benjamin Herrenschmidt 2010-03-05 4:34 ` Benjamin Herrenschmidt 2010-03-05 9:27 ` Catalin Marinas 2010-03-05 9:27 ` Catalin Marinas 2010-03-05 1:17 ` Paul Mundt 2010-03-05 1:17 ` Paul Mundt 2010-03-05 1:17 ` Paul Mundt 2010-03-05 4:44 ` Benjamin Herrenschmidt 2010-03-05 4:44 ` Benjamin Herrenschmidt 2010-03-05 4:44 ` Benjamin Herrenschmidt 2010-03-10 3:52 ` Paul Mundt 2010-03-10 3:52 ` Paul Mundt 2010-03-10 3:52 ` Paul Mundt 2010-03-11 21:44 ` Benjamin Herrenschmidt 2010-03-11 21:44 ` Benjamin Herrenschmidt 2010-03-11 21:44 ` Benjamin Herrenschmidt 2010-03-04 21:34 ` Benjamin Herrenschmidt 2010-03-04 21:34 ` Benjamin Herrenschmidt 2010-03-04 21:28 ` Benjamin Herrenschmidt 2010-03-04 21:28 ` Benjamin Herrenschmidt 2010-03-04 21:40 ` Russell King - ARM Linux 2010-03-04 21:40 ` Russell King - ARM Linux 2010-03-05 4:31 ` Benjamin Herrenschmidt 2010-03-05 4:31 ` Benjamin Herrenschmidt 2010-03-04 15:35 ` Catalin Marinas 2010-03-04 15:35 ` Catalin Marinas 2010-03-07 8:23 ` Pavel Machek 2010-03-07 8:23 ` Pavel Machek 2010-03-08 10:57 ` Catalin Marinas 2010-03-08 10:57 ` Catalin Marinas 2010-03-02 23:26 ` Benjamin Herrenschmidt 2010-03-02 23:26 ` Benjamin Herrenschmidt 2010-03-01 10:42 ` Catalin Marinas 2010-03-01 10:42 ` Catalin Marinas 2010-03-03 20:24 ` Jamie Lokier 2010-03-03 20:24 ` Jamie Lokier 2010-02-26 21:40 ` Benjamin Herrenschmidt 2010-02-26 21:40 ` Benjamin Herrenschmidt 2010-02-26 21:49 ` Russell King - ARM Linux 2010-02-26 21:49 ` Russell King - ARM Linux 2010-02-28 0:24 ` Benjamin Herrenschmidt 2010-02-28 0:24 ` Benjamin Herrenschmidt 2010-02-28 19:17 ` Pavel Machek 2010-02-28 19:17 ` Pavel Machek 2010-03-01 11:10 ` Catalin Marinas 2010-03-01 11:10 ` Catalin Marinas 2010-03-02 4:11 ` Benjamin Herrenschmidt 2010-03-02 4:11 ` Benjamin Herrenschmidt 2010-02-24 2:39 ` Benjamin Herrenschmidt 2010-02-24 2:39 ` Benjamin Herrenschmidt 2010-02-26 16:44 ` Catalin Marinas 2010-02-26 16:44 ` Catalin Marinas 2010-02-26 21:49 ` Benjamin Herrenschmidt 2010-02-26 21:49 ` Benjamin Herrenschmidt 2010-02-26 22:03 ` Russell King - ARM Linux 2010-02-26 22:03 ` Russell King - ARM Linux 2010-02-28 0:29 ` Benjamin Herrenschmidt 2010-02-28 0:29 ` Benjamin Herrenschmidt 2010-02-28 23:20 ` Catalin Marinas 2010-02-28 23:20 ` Catalin Marinas 2010-02-28 23:17 ` Catalin Marinas 2010-02-28 23:17 ` Catalin Marinas 2010-02-17 15:27 ` Catalin Marinas 2010-02-17 15:27 ` Catalin Marinas 2010-02-17 15:39 ` 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 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 2010-02-17 16:19 ` Re: " Catalin Marinas 2010-02-17 16:19 ` Catalin Marinas 2010-02-16 8:44 ` Russell King - ARM Linux 2010-02-16 8:44 ` Russell King - ARM Linux 2010-02-16 8:51 ` Gadiyar, Anand 2010-02-16 8:51 ` Gadiyar, Anand 2010-02-20 7:21 ` Pete Zaitcev 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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