From: Michael Schmitz <schmitzmic@gmail.com>
To: Arnd Bergmann <arnd@kernel.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
scsi <linux-scsi@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Arnd Bergmann <arnd@arndb.de>, Jakub Kicinski <kuba@kernel.org>,
Christoph Hellwig <hch@infradead.org>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Robin Murphy <robin.murphy@arm.com>,
Linux IOMMU <iommu@lists.linux-foundation.org>,
Khalid Aziz <khalid@gonehiking.org>,
"Maciej W . Rozycki" <macro@orcam.me.uk>,
Matt Wang <wwentao@vmware.com>,
Miquel van Smoorenburg <mikevs@xs4all.net>,
Mark Salyzyn <salyzyn@android.com>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
Linux-Arch <linux-arch@vger.kernel.org>,
alpha <linux-alpha@vger.kernel.org>,
linux-m68k <linux-m68k@lists.linux-m68k.org>,
Parisc List <linux-parisc@vger.kernel.org>,
Denis Efremov <efremov@linux.com>,
Michael Ellerman <mpe@ellerman.id.au>,
John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Subject: Re: [PATCH v2 3/3] arch/*/: remove CONFIG_VIRT_TO_BUS
Date: Wed, 29 Jun 2022 11:43:55 +1200 [thread overview]
Message-ID: <9334bac7-c9d3-b17b-f6d6-12c4bec3d138@gmail.com> (raw)
In-Reply-To: <CAK8P3a2jvFQBvKfdR5ivDBECN5tEej6Ja4=7Loze646hrQ5wzg@mail.gmail.com>
Hi Arnd,
On 29/06/22 09:55, Arnd Bergmann wrote:
> On Tue, Jun 28, 2022 at 11:38 PM Michael Schmitz <schmitzmic@gmail.com> wrote:
>> On 28/06/22 19:08, Arnd Bergmann wrote:
>>> I see two other problems with your patch though:
>>>
>>> a) you still duplicate the cache handling: the cache_clear()/cache_push()
>>> is supposed to already be done by dma_map_single() when the device
>>> is not cache-coherent.
>> That's one of the 'liberties' I alluded to. The reason I left these in
>> is that I'm none too certain what device feature the DMA API uses to
>> decide a device isn't cache-coherent. If it's dev->coherent_dma_mask,
>> the way I set up the device in the a3000 driver should leave the
>> coherent mask unchanged. For the Zorro drivers, devices are set up to
>> use the same storage to store normal and coherent masks - something we
>> most likely want to change. I need to think about the ramifications of
>> that.
>>
>> Note that zorro_esp.c uses dma_sync_single_for_device() and uses a 32
>> bit coherent DMA mask which does work OK. I might ask Adrian to test a
>> change to only set dev->dma_mask, and drop the
>> dma_sync_single_for_device() calls if there's any doubt on this aspect.
> The "coherent_mask" is independent of the cache flushing. On some
> architectures, a device can indicate whether it needs cache management
> or not to guarantee coherency, but on m68k it appears that we always
> assume it does, see arch/m68k/kernel/dma.c
Thanks - what I see there indicates that on the relevant platforms,
pages mapped for DMA have their page table cache bits modified to make
them non-cacheable (and I suppose unmapping restores the default cache
bits). That means I should use dma_set_mask_and_coherent() here to take
advantage of this, and no need to mess around with
dma_sync_single_for_device() in the drivers' dma_setup() functions.
>>> b) The bounce buffer is never mapped here, instead you have the
>>> virt_to_phys() here, which is not the same. I think you need to map
>>> the pointer that actually gets passed down to the device after deciding
>>> to use a bouce buffer or not.
>> I hadn't realized that I can map the bounce buffer just as it's done for
>> the SCp data buffer. Should have been obvious, but I'm still learning
>> about the DMA API.
>>
>> I've updated the patch now, will re-send as part of a complete series
>> once done.
> I suppose you can just drop the bounce buffer if this just comes
> from kmalloc().
That's only true for a3000 and mvme147 though.
Cheers,
Michael
>
> Arnd
next prev parent reply other threads:[~2022-06-28 23:44 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-17 12:57 [PATCH v2 0/3] phase out CONFIG_VIRT_TO_BUS Arnd Bergmann
2022-06-17 12:57 ` [PATCH v2 1/3] scsi: dpt_i2o: drop stale VIRT_TO_BUS dependency Arnd Bergmann
2022-06-21 8:43 ` Hannes Reinecke
2022-06-17 12:57 ` [PATCH v2 2/3] scsi: BusLogic remove bus_to_virt Arnd Bergmann
2022-06-17 14:02 ` Robin Murphy
2022-06-21 8:45 ` Hannes Reinecke
2022-06-21 21:56 ` Khalid Aziz
2022-06-23 14:47 ` Arnd Bergmann
2022-06-24 15:38 ` Khalid Aziz
2022-06-24 15:43 ` Arnd Bergmann
2022-06-17 12:57 ` [PATCH v2 3/3] arch/*/: remove CONFIG_VIRT_TO_BUS Arnd Bergmann
2022-06-18 1:06 ` Michael Schmitz
2022-06-24 9:10 ` Arnd Bergmann
2022-06-26 5:21 ` Michael Schmitz
2022-06-26 8:36 ` Arnd Bergmann
2022-06-27 8:09 ` Michael Schmitz
2022-06-27 8:26 ` Geert Uytterhoeven
2022-06-27 21:12 ` Michael Schmitz
2022-06-28 3:25 ` Michael Schmitz
2022-06-28 7:03 ` Geert Uytterhoeven
2022-06-28 21:03 ` Michael Schmitz
2022-06-28 21:50 ` Arnd Bergmann
2022-06-28 23:09 ` Michael Schmitz
2022-06-28 23:50 ` Bart Van Assche
2022-06-29 0:01 ` Michael Schmitz
2022-06-29 0:14 ` Michael Schmitz
2022-06-29 6:21 ` Christoph Hellwig
2022-06-30 19:21 ` Michael Schmitz
2022-06-30 8:04 ` David Laight
2022-06-30 9:40 ` Christophe Leroy
2022-06-30 10:32 ` David Laight
2022-06-28 7:08 ` Arnd Bergmann
2022-06-28 21:38 ` Michael Schmitz
2022-06-28 21:55 ` Arnd Bergmann
2022-06-28 23:43 ` Michael Schmitz [this message]
2022-06-29 6:25 ` Christoph Hellwig
2022-06-30 19:26 ` Michael Schmitz
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