linux-toradex.git/arch/powerpc/kernel/vio.c, branch v2.6.19.2

[POWERPC] Use 4kB iommu pages even on 64kB-page systems

2006-11-01T03:52:48+00:00

The 10Gigabit ethernet device drivers appear to be able to chew
up all 256MB of TCE mappings on pSeries systems, as evidenced by
numerous error messages:

 iommu_alloc failed, tbl c0000000010d5c48 vaddr c0000000d875eff0 npages 1

Some experimentation indicates that this is essentially because
one 1500 byte ethernet MTU gets mapped as a 64K DMA region when
the large 64K pages are enabled. Thus, it doesn't take much to
exhaust all of the available DMA mappings for a high-speed card.

This patch changes the iommu allocator to work with its own
unique, distinct page size. Although the patch is long, its
actually quite simple: it just #defines a distinct IOMMU_PAGE_SIZE
and then uses this in all the places that matter.

As a side effect, it also dramatically improves network performance
on platforms with H-calls on iommu translation inserts/removes (since
we no longer call it 16 times for a 1500 bytes packet when the iommu HW
is still 4k).

In the future, we might want to make the IOMMU_PAGE_SIZE a variable
in the iommu_table instance, thus allowing support for different HW
page sizes in the iommu itself.

Signed-off-by: Linas Vepstas 
Signed-off-by: Benjamin Herrenschmidt 
Acked-by: Olof Johansson 
Acked-by: Stephen Rothwell 
Signed-off-by: Paul Mackerras

[POWERPC] Constify & voidify get_property()

2006-07-31T05:55:04+00:00

Now that get_property() returns a void *, there's no need to cast its
return value. Also, treat the return value as const, so we can
constify get_property later.

powerpc core changes.

Signed-off-by: Jeremy Kerr 
Signed-off-by: Paul Mackerras

[POWERPC] Add new interrupt mapping core and change platforms to use it

2006-07-03T11:36:01+00:00

This adds the new irq remapper core and removes the old one.  Because
there are some fundamental conflicts with the old code, like the value
of NO_IRQ which I'm now setting to 0 (as per discussions with Linus),
etc..., this commit also changes the relevant platform and driver code
over to use the new remapper (so as not to cause difficulties later
in bisecting).

This patch removes the old pre-parsing of the open firmware interrupt
tree along with all the bogus assumptions it made to try to renumber
interrupts according to the platform. This is all to be handled by the
new code now.

For the pSeries XICS interrupt controller, a single remapper host is
created for the whole machine regardless of how many interrupt
presentation and source controllers are found, and it's set to match
any device node that isn't a 8259.  That works fine on pSeries and
avoids having to deal with some of the complexities of split source
controllers vs. presentation controllers in the pSeries device trees.

The powerpc i8259 PIC driver now always requests the legacy interrupt
range. It also has the feature of being able to match any device node
(including NULL) if passed no device node as an input. That will help
porting over platforms with broken device-trees like Pegasos who don't
have a proper interrupt tree.

Signed-off-by: Benjamin Herrenschmidt 
Signed-off-by: Paul Mackerras

[POWERPC] node local IOMMU tables

2006-06-15T09:31:26+00:00

Allocate IOMMU tables local to the relevant node.

Signed-off-by: Anton Blanchard 
Acked-by: Olof Johansson 
Signed-off-by: Paul Mackerras

[PATCH] powerpc: node-aware dma allocations

2006-06-09T11:24:01+00:00

Make sure dma_alloc_coherent allocates memory from the local node.  This
is important on Cell where we avoid going through the slow cpu
interconnect.

Note:  I could only test this patch on Cell, it should be verified on
some pseries machine by those that have the hardware.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Paul Mackerras

[PATCH] powerpc: the iSeries vio lan driver changed device type

2006-05-19T05:02:24+00:00

So the IOMMU table building code needs to match.

Signed-off-by: Stephen Rothwell 
Signed-off-by: Paul Mackerras

[PATCH] powerpc: pseries: Use generic dma-window parsing function

2006-05-19T05:02:23+00:00

Change the pseries iommu init code to use the new of_parse_dma_window()
to parse the ibm,dma-window and ibm,my-dma-window properties of pci and
virtual device nodes.

Also, clean up vio_build_iommu_table() a little.

Tested on pseries, with both vio and pci devices.

Signed-off-by: Jeremy Kerr 
Acked-by: Olof Johansson 
Signed-off-by: Paul Mackerras

[PATCH] powerpc: merge the rest of the vio code

2006-04-29T08:02:02+00:00

Signed-off-by: Stephen Rothwell 
Signed-off-by: Paul Mackerras

[PATCH] powerpc: use a common vio_match_device routine

2006-04-29T08:02:01+00:00

This requires the compatible properties having vaules that are empty
strings instead of just being empty properties.

Signed-off-by: Stephen Rothwell 
Signed-off-by: Paul Mackerras

[PATCH] powerpc: use the device tree for the iSeries vio bus probe

2006-04-29T08:02:00+00:00

As an added bonus, since every vio_dev now has a device_node
associated with it, hotplug now works.

Signed-off-by: Stephen Rothwell 
Signed-off-by: Paul Mackerras