From: "Niklas Söderlund" <niklas.soderlund-1zkq55x86MTxsAP9Fp7wbw@public.gmane.org>
To: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Cc: linux-arch-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>,
geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org,
Vinod Koul <vinod.koul-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
Linus Walleij
<linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linux-renesas-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
Laurent Pinchart
<laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>,
"dmaengine-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<dmaengine-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Dan Williams
<dan.j.williams-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>
Subject: Re: [PATCH v5 3/9] dma-mapping: add dma_{map,unmap}_resource
Date: Wed, 13 Apr 2016 15:29:17 +0200 [thread overview]
Message-ID: <20160413132916.GC19650@bigcity.dyn.berto.se> (raw)
In-Reply-To: <20160321152601.GA11674-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Hi Christoph,
On 2016-03-21 08:26:01 -0700, Christoph Hellwig wrote:
> On Thu, Mar 17, 2016 at 01:33:51PM +0200, Laurent Pinchart wrote:
> > The good news is that, given that no code uses this new API at the moment,
> > there isn't much to audit. The patch series implements the resource mapping
> > for arch/arm only, and makes use of it in the rcar-dmac driver only. Would you
> > like anything audited else than the arch/arm dma mapping implementation, the
> > rcar-dmac driver and the code that then deals with the dma addresses (I'm
> > thinking about the IOMMU subsystem and the ipmmu-vmsa driver in particular) ?
>
> Yes, it would be good to do an audit of all the ARM dma_ops as well
> as generic code like drivers/base/dma-*.c, lib/dma-debug.c and
> include/linux/dma-*.h
I have now done an audit to the best of my abilities, thanks to Laurent
for pointing me in the right direction. And from what I can tell we are
good.
* drivers/dma/sh/rcar-dmac.c
Once the phys_addr_t is mapped to a dma_addr_t using
dma_map_resource() it is only used to check that the transfere do not
cross 4GB boundaries and then only directly written to HW registers.
* drivers/iommu/iommu.c
- iommu_map()
Check that it's align to min page size or return -EINVAL then calls
domain->ops->map()
* drivers/iommu/ipmmu-vmsa.c
- ipmmu_map()
No logic only calls domain->ops->map()
* drivers/iommu/io-pgtable-arm.c
- arm_lpae_map()
No logic only calls __arm_lpae_map()
- __arm_lpae_map()
No logic only calls arm_lpae_init_pte()
- arm_lpae_init_pte()
Used to get a pte:
pte |= pfn_to_iopte(paddr >> data->pg_shift, data);
* drivers/iommu/io-pgtable-arm-v7s.c
- arm_v7s_map()
No logic only calls __arm_v7s_map()
- __arm_v7s_map()
No logic only calls arm_v7s_init_pte()
- arm_v7s_init_pte
Used to get a pte:
pte |= paddr & ARM_V7S_LVL_MASK(lvl);
* ARM dma-mapping
- dma_unmap_*
Only valid unmap is dma_unmap_resource() all others are an invalid
use case.
- dma_sync_single_*
Invalid use case, memmory that is mapped is device memmory
- dma_common_mmap() and dma_mmap_attrs()
Invalid use case
- dma_common_get_sgtable() and dma_get_sgtable_attrs()
Invalid use case, only for dma_alloc_* allocated memory,
- dma_mapping_error()
OK
--
Regards,
Niklas Söderlund
WARNING: multiple messages have this Message-ID (diff)
From: "Niklas Söderlund" <niklas.soderlund@ragnatech.se>
To: Christoph Hellwig <hch@infradead.org>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Dan Williams <dan.j.williams@intel.com>,
Vinod Koul <vinod.koul@intel.com>,
linux-renesas-soc@vger.kernel.org,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"dmaengine@vger.kernel.org" <dmaengine@vger.kernel.org>,
iommu@lists.linux-foundation.org, robin.murphy@arm.com,
geert+renesas@glider.be, Linus Walleij <linus.walleij@linaro.org>,
Arnd Bergmann <arnd@arndb.de>,
linux-arch@vger.kernel.org
Subject: Re: [PATCH v5 3/9] dma-mapping: add dma_{map,unmap}_resource
Date: Wed, 13 Apr 2016 15:29:17 +0200 [thread overview]
Message-ID: <20160413132916.GC19650@bigcity.dyn.berto.se> (raw)
Message-ID: <20160413132917.PiK2qCAMd4vsveSGKioKVKtqvzX6GJSiaUWjJs3Fh-A@z> (raw)
In-Reply-To: <20160321152601.GA11674@infradead.org>
Hi Christoph,
On 2016-03-21 08:26:01 -0700, Christoph Hellwig wrote:
> On Thu, Mar 17, 2016 at 01:33:51PM +0200, Laurent Pinchart wrote:
> > The good news is that, given that no code uses this new API at the moment,
> > there isn't much to audit. The patch series implements the resource mapping
> > for arch/arm only, and makes use of it in the rcar-dmac driver only. Would you
> > like anything audited else than the arch/arm dma mapping implementation, the
> > rcar-dmac driver and the code that then deals with the dma addresses (I'm
> > thinking about the IOMMU subsystem and the ipmmu-vmsa driver in particular) ?
>
> Yes, it would be good to do an audit of all the ARM dma_ops as well
> as generic code like drivers/base/dma-*.c, lib/dma-debug.c and
> include/linux/dma-*.h
I have now done an audit to the best of my abilities, thanks to Laurent
for pointing me in the right direction. And from what I can tell we are
good.
* drivers/dma/sh/rcar-dmac.c
Once the phys_addr_t is mapped to a dma_addr_t using
dma_map_resource() it is only used to check that the transfere do not
cross 4GB boundaries and then only directly written to HW registers.
* drivers/iommu/iommu.c
- iommu_map()
Check that it's align to min page size or return -EINVAL then calls
domain->ops->map()
* drivers/iommu/ipmmu-vmsa.c
- ipmmu_map()
No logic only calls domain->ops->map()
* drivers/iommu/io-pgtable-arm.c
- arm_lpae_map()
No logic only calls __arm_lpae_map()
- __arm_lpae_map()
No logic only calls arm_lpae_init_pte()
- arm_lpae_init_pte()
Used to get a pte:
pte |= pfn_to_iopte(paddr >> data->pg_shift, data);
* drivers/iommu/io-pgtable-arm-v7s.c
- arm_v7s_map()
No logic only calls __arm_v7s_map()
- __arm_v7s_map()
No logic only calls arm_v7s_init_pte()
- arm_v7s_init_pte
Used to get a pte:
pte |= paddr & ARM_V7S_LVL_MASK(lvl);
* ARM dma-mapping
- dma_unmap_*
Only valid unmap is dma_unmap_resource() all others are an invalid
use case.
- dma_sync_single_*
Invalid use case, memmory that is mapped is device memmory
- dma_common_mmap() and dma_mmap_attrs()
Invalid use case
- dma_common_get_sgtable() and dma_get_sgtable_attrs()
Invalid use case, only for dma_alloc_* allocated memory,
- dma_mapping_error()
OK
--
Regards,
Niklas Söderlund
next prev parent reply other threads:[~2016-04-13 13:29 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-08 2:42 [PATCH v5 0/9] dmaengine: rcar-dmac: add iommu support for slave transfers Niklas Söderlund
2016-03-08 2:42 ` Niklas Söderlund
2016-03-08 2:42 ` [PATCH v5 1/9] iommu: Add MMIO mapping type Niklas Söderlund
[not found] ` <1457404974-1800-2-git-send-email-niklas.soderlund+renesas-1zkq55x86MTxsAP9Fp7wbw@public.gmane.org>
2016-03-17 11:18 ` Laurent Pinchart
2016-03-17 11:18 ` Laurent Pinchart
2016-03-08 2:42 ` [PATCH v5 2/9] dma-mapping: add {map,unmap}_resource to dma_map_ops Niklas Söderlund
2016-03-08 2:42 ` Niklas Söderlund
[not found] ` <1457404974-1800-1-git-send-email-niklas.soderlund+renesas-1zkq55x86MTxsAP9Fp7wbw@public.gmane.org>
2016-03-08 2:42 ` [PATCH v5 3/9] dma-mapping: add dma_{map,unmap}_resource Niklas Söderlund
2016-03-08 2:42 ` Niklas Söderlund
2016-03-08 7:38 ` Christoph Hellwig
2016-03-10 16:05 ` Niklas S??derlund
2016-03-10 16:05 ` Niklas S??derlund
2016-03-11 6:19 ` Vinod Koul
2016-03-11 6:19 ` Vinod Koul
2016-03-11 6:47 ` Dan Williams
2016-03-11 6:47 ` Dan Williams
2016-03-11 11:15 ` Christoph Hellwig
2016-03-11 12:58 ` Niklas Söderlund
2016-03-11 12:58 ` Niklas Söderlund
2016-03-15 8:22 ` Christoph Hellwig
[not found] ` <20160315082254.GE9136-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2016-03-17 11:33 ` Laurent Pinchart
2016-03-17 11:33 ` Laurent Pinchart
2016-03-21 15:26 ` Christoph Hellwig
2016-03-21 15:26 ` Christoph Hellwig
[not found] ` <20160321152601.GA11674-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2016-04-13 13:29 ` Niklas Söderlund [this message]
2016-04-13 13:29 ` Niklas Söderlund
2016-04-21 9:48 ` Niklas Söderlund
2016-04-21 9:48 ` Niklas Söderlund
2016-04-21 13:49 ` Christoph Hellwig
2016-04-21 13:49 ` Christoph Hellwig
2016-04-25 14:26 ` Niklas Söderlund
2016-04-25 14:26 ` Niklas Söderlund
2016-04-25 19:10 ` Christoph Hellwig
2016-04-25 19:10 ` Christoph Hellwig
[not found] ` <20160425191004.GA13906-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2016-04-26 13:29 ` Niklas Söderlund
2016-04-26 13:29 ` Niklas Söderlund
[not found] ` <CAPcyv4gO4EZnBuVKXT8+gsMhbHJzuK7sfr0uRcjVdJP-nUUz4A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-03-11 13:46 ` Robin Murphy
2016-03-11 13:46 ` Robin Murphy
2016-03-11 17:51 ` Dan Williams
2016-03-08 2:42 ` [PATCH v5 4/9] arm: dma-mapping: add {map, unmap}_resource for iommu ops Niklas Söderlund
2016-03-08 2:42 ` [PATCH v5 4/9] arm: dma-mapping: add {map,unmap}_resource " Niklas Söderlund
2016-03-08 2:42 ` [PATCH v5 5/9] dmaengine: rcar-dmac: slave address are physical Niklas Söderlund
2016-03-08 2:42 ` Niklas Söderlund
[not found] ` <1457404974-1800-6-git-send-email-niklas.soderlund+renesas-1zkq55x86MTxsAP9Fp7wbw@public.gmane.org>
2016-03-17 11:30 ` Laurent Pinchart
2016-03-17 11:30 ` Laurent Pinchart
2016-03-08 2:42 ` [PATCH v5 6/9] dmaengine: rcar-dmac: group slave configuration Niklas Söderlund
2016-03-08 2:42 ` Niklas Söderlund
[not found] ` <1457404974-1800-7-git-send-email-niklas.soderlund+renesas-1zkq55x86MTxsAP9Fp7wbw@public.gmane.org>
2016-03-17 11:28 ` Laurent Pinchart
2016-03-17 11:28 ` Laurent Pinchart
2016-03-08 2:42 ` [PATCH v5 7/9] dmaengine: rcar-dmac: add iommu support for slave transfers Niklas Söderlund
2016-03-08 2:42 ` Niklas Söderlund
2016-03-08 2:42 ` [PATCH v5 8/9] ARM: dts: r8a7790: add iommus to dmac0 and dmac1 Niklas Söderlund
2016-03-08 2:42 ` Niklas Söderlund
2016-03-08 2:42 ` [PATCH v5 9/9] ARM: dts: r8a7791: " Niklas Söderlund
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