From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Cc: aik@au1.ibm.com, anton@au1.ibm.com, paulus@samba.org,
sparclinux@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
davem@davemloft.net
Subject: Re: [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and l
Date: Thu, 02 Apr 2015 22:01:37 +0000 [thread overview]
Message-ID: <1428012097.20500.279.camel@kernel.crashing.org> (raw)
In-Reply-To: <1428011820.20500.277.camel@kernel.crashing.org>
On Fri, 2015-04-03 at 08:57 +1100, Benjamin Herrenschmidt wrote:
> No, the last argument to iommu_area_alloc() which is passed from the
> callers when doing consistent allocs. Basically, the DMA api mandates
> that consistent allocs are naturally aligned (to their own size), we
> implement that on powerpc by passing that alignment argument down.
Talking of this ... I notice this is not documented in DMA-API.txt...
however many drivers make that assumption, and the DMA pool allocator
in mm/dmapool.c as well.
Maybe somebody should update DMA-API.txt...
Cheers,
Ben.
WARNING: multiple messages have this Message-ID (diff)
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Cc: aik@au1.ibm.com, anton@au1.ibm.com, paulus@samba.org,
sparclinux@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
davem@davemloft.net
Subject: Re: [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and lock
Date: Fri, 03 Apr 2015 09:01:37 +1100 [thread overview]
Message-ID: <1428012097.20500.279.camel@kernel.crashing.org> (raw)
In-Reply-To: <1428011820.20500.277.camel@kernel.crashing.org>
On Fri, 2015-04-03 at 08:57 +1100, Benjamin Herrenschmidt wrote:
> No, the last argument to iommu_area_alloc() which is passed from the
> callers when doing consistent allocs. Basically, the DMA api mandates
> that consistent allocs are naturally aligned (to their own size), we
> implement that on powerpc by passing that alignment argument down.
Talking of this ... I notice this is not documented in DMA-API.txt...
however many drivers make that assumption, and the DMA pool allocator
in mm/dmapool.c as well.
Maybe somebody should update DMA-API.txt...
Cheers,
Ben.
next prev parent reply other threads:[~2015-04-02 22:01 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-31 14:40 [PATCH v8 RFC 0/3] Generic IOMMU pooled allocator Sowmini Varadhan
2015-03-31 14:40 ` Sowmini Varadhan
2015-03-31 14:40 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and lock Sowmini Varadhan
2015-03-31 14:40 ` Sowmini Varadhan
2015-03-31 15:15 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and l David Laight
2015-03-31 15:15 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and lock David Laight
2015-03-31 15:25 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and l Sowmini Varadhan
2015-03-31 15:25 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and lock Sowmini Varadhan
2015-04-02 20:54 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and l Benjamin Herrenschmidt
2015-04-02 20:54 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and lock Benjamin Herrenschmidt
2015-04-02 21:43 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and l Sowmini Varadhan
2015-04-02 21:43 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and lock Sowmini Varadhan
2015-04-02 21:57 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and l Benjamin Herrenschmidt
2015-04-02 21:57 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and lock Benjamin Herrenschmidt
2015-04-02 22:01 ` Benjamin Herrenschmidt [this message]
2015-04-02 22:01 ` Benjamin Herrenschmidt
2015-04-02 22:02 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and l Benjamin Herrenschmidt
2015-04-02 22:02 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and lock Benjamin Herrenschmidt
2015-04-02 22:15 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and l Sowmini Varadhan
2015-04-02 22:15 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and lock Sowmini Varadhan
2015-04-02 22:19 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and l Benjamin Herrenschmidt
2015-04-02 22:19 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and lock Benjamin Herrenschmidt
2015-04-02 21:54 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and l Sowmini Varadhan
2015-04-02 21:54 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and lock Sowmini Varadhan
2015-04-02 22:08 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and l Benjamin Herrenschmidt
2015-04-02 22:08 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and lock Benjamin Herrenschmidt
2015-04-03 0:42 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and l David Miller
2015-04-03 0:42 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and lock David Miller
2015-04-03 18:28 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and l Sowmini Varadhan
2015-04-03 18:28 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and lock Sowmini Varadhan
2015-04-03 21:06 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and l Benjamin Herrenschmidt
2015-04-03 21:06 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and lock Benjamin Herrenschmidt
2015-04-03 21:51 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and l Sowmini Varadhan
2015-04-03 21:51 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and lock Sowmini Varadhan
2015-04-04 11:27 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and l Sowmini Varadhan
2015-04-04 11:27 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and lock Sowmini Varadhan
2015-04-04 13:33 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and l Benjamin Herrenschmidt
2015-04-04 13:33 ` [PATCH v8 RFC 1/3] sparc: Break up monolithic iommu table/lock into finer graularity pools and lock Benjamin Herrenschmidt
2015-03-31 14:40 ` [PATCH v8 RFC 2/3] sparc: Make sparc64 use scalable lib/iommu-common.c functions Sowmini Varadhan
2015-03-31 14:40 ` Sowmini Varadhan
2015-03-31 14:40 ` [PATCH v8 RFC 3/3] sparc: Make LDC use common iommu poll management functions Sowmini Varadhan
2015-03-31 14:40 ` Sowmini Varadhan
2015-03-31 18:06 ` [PATCH v8 RFC 0/3] Generic IOMMU pooled allocator Sowmini Varadhan
2015-03-31 18:06 ` Sowmini Varadhan
2015-03-31 18:08 ` David Miller
2015-03-31 18:08 ` David Miller
2015-04-01 1:01 ` Benjamin Herrenschmidt
2015-04-01 1:01 ` Benjamin Herrenschmidt
2015-04-01 1:08 ` Sowmini Varadhan
2015-04-01 1:08 ` Sowmini Varadhan
2015-04-01 3:12 ` David Miller
2015-04-01 3:12 ` David Miller
2015-04-02 12:51 ` Sowmini Varadhan
2015-04-02 12:51 ` Sowmini Varadhan
2015-04-02 16:21 ` David Miller
2015-04-02 16:21 ` David Miller
2015-04-02 20:22 ` Benjamin Herrenschmidt
2015-04-02 20:22 ` Benjamin Herrenschmidt
2015-04-02 20:52 ` Benjamin Herrenschmidt
2015-04-02 20:52 ` Benjamin Herrenschmidt
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