On Thu, 2015-04-02 at 16:39 +1100, Benjamin Herrenschmidt wrote:
> On Thu, 2015-02-19 at 21:45 -0800, James Bottomley wrote:
>
> > Ben, this is legal by design. It was specifically designed for the
> > aic79xx SCSI card, but can be used for a variety of other reasons. The
> > aic79xx hardware
On Thu, 2015-04-02 at 16:39 +1100, Benjamin Herrenschmidt wrote:
On Thu, 2015-02-19 at 21:45 -0800, James Bottomley wrote:
Ben, this is legal by design. It was specifically designed for the
aic79xx SCSI card, but can be used for a variety of other reasons. The
aic79xx hardware problem
On Thu, 2015-02-19 at 21:45 -0800, James Bottomley wrote:
> Ben, this is legal by design. It was specifically designed for the
> aic79xx SCSI card, but can be used for a variety of other reasons. The
> aic79xx hardware problem was that the DMA engine could address the whole
> of memory (it had
On Thu, 2015-02-19 at 21:45 -0800, James Bottomley wrote:
Ben, this is legal by design. It was specifically designed for the
aic79xx SCSI card, but can be used for a variety of other reasons. The
aic79xx hardware problem was that the DMA engine could address the whole
of memory (it had two
On Thu, 2015-02-19 at 21:45 -0800, James Bottomley wrote:
> Ben, this is legal by design. It was specifically designed for the
> aic79xx SCSI card, but can be used for a variety of other reasons. The
> aic79xx hardware problem was that the DMA engine could address the whole
> of memory (it had
On Fri, 2015-02-20 at 16:22 +1100, Benjamin Herrenschmidt wrote:
> Looking a bit more closely, you basically do
>
> - set_dma_mask(64-bit)
> - set_consistent_dma_mask(32-bit)
>
> Now, I don't know how x86 will react to the conflicting masks, but on
> ppc64, I'm pretty sure the second one will
On Fri, 2015-02-20 at 16:22 +1100, Benjamin Herrenschmidt wrote:
> On Fri, 2015-02-20 at 16:06 +1100, Benjamin Herrenschmidt wrote:
>
> > Note that even on powerpc platforms where it would work because we
> > maintain both 32-bit and 64-bit bypass windows in the device address
> > space
On Fri, 2015-02-20 at 16:06 +1100, Benjamin Herrenschmidt wrote:
> Note that even on powerpc platforms where it would work because we
> maintain both 32-bit and 64-bit bypass windows in the device address
> space simultaneously, you will leak iommu entries unless you also switch
> back to 32-bit
On Fri, 2015-02-20 at 16:01 +1100, Benjamin Herrenschmidt wrote:
> Hi Sreekanth !
>
> While looking at some (unrelated) issue where mtp2sas seems to be using
> 32-bit DMA instead of 64-bit DMA on some POWER platforms, I noticed this
> patch which was merged as
Hi Sreekanth !
While looking at some (unrelated) issue where mtp2sas seems to be using
32-bit DMA instead of 64-bit DMA on some POWER platforms, I noticed this
patch which was merged as 5fb1bf8aaa832e1e9ca3198de7bbecb8eff7db9c.
Can you confirm my understanding that you are:
- Setting the DMA
On Fri, 2015-02-20 at 16:01 +1100, Benjamin Herrenschmidt wrote:
Hi Sreekanth !
While looking at some (unrelated) issue where mtp2sas seems to be using
32-bit DMA instead of 64-bit DMA on some POWER platforms, I noticed this
patch which was merged as 5fb1bf8aaa832e1e9ca3198de7bbecb8eff7db9c.
On Fri, 2015-02-20 at 16:22 +1100, Benjamin Herrenschmidt wrote:
Looking a bit more closely, you basically do
- set_dma_mask(64-bit)
- set_consistent_dma_mask(32-bit)
Now, I don't know how x86 will react to the conflicting masks, but on
ppc64, I'm pretty sure the second one will barf.
On Thu, 2015-02-19 at 21:45 -0800, James Bottomley wrote:
Ben, this is legal by design. It was specifically designed for the
aic79xx SCSI card, but can be used for a variety of other reasons. The
aic79xx hardware problem was that the DMA engine could address the whole
of memory (it had two
Hi Sreekanth !
While looking at some (unrelated) issue where mtp2sas seems to be using
32-bit DMA instead of 64-bit DMA on some POWER platforms, I noticed this
patch which was merged as 5fb1bf8aaa832e1e9ca3198de7bbecb8eff7db9c.
Can you confirm my understanding that you are:
- Setting the DMA
On Fri, 2015-02-20 at 16:06 +1100, Benjamin Herrenschmidt wrote:
Note that even on powerpc platforms where it would work because we
maintain both 32-bit and 64-bit bypass windows in the device address
space simultaneously, you will leak iommu entries unless you also switch
back to 32-bit when
On Fri, 2015-02-20 at 16:22 +1100, Benjamin Herrenschmidt wrote:
On Fri, 2015-02-20 at 16:06 +1100, Benjamin Herrenschmidt wrote:
Note that even on powerpc platforms where it would work because we
maintain both 32-bit and 64-bit bypass windows in the device address
space simultaneously,
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