[PATCH 0/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU API implementation.

[PATCH 0/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU API implementation.

[Varun Sethi]

This patchset provides the Freescale PAMU (Peripheral Access Management Unit) driver
and the corresponding IOMMU API implementation. PAMU is the IOMMU present on Freescale
QorIQ platforms. PAMU can authorize memory access, remap the memory address, and remap 
the I/O transaction type.

This set consists of the following patches:
1. Addition of new field in the device (powerpc) archdata structure for storing iommu domain information
   pointer. This pointer is stored when the device is attached to a particular iommu domain.
2. Store PCI controller platform device information in the PCI controller structure.
3. Add defines for FSL PCI controller BRR1 register.
4. Add window permission flags in the iommu_domain_window_enable API.
5. Add domain attributes for FSL PAMU driver.
6. PAMU driver and IOMMU API implementation.

This patch set is based on the next branch of the iommu git tree maintained by Joerg.

Varun Sethi (6):
  Store iommu domain information in the device structure.
  Store the platform device information corresponding to the pci
    controller.
  Added defines for the FSL PCI controller BRR1 register.
  Add window permission flags for iommu_domain_window_enable API.
  Add addtional attributes specific to the PAMU driver.
  FSL PAMU driver and IOMMU API implementation.

 arch/powerpc/include/asm/device.h     |    4 +
 arch/powerpc/include/asm/pci-bridge.h |    4 +
 arch/powerpc/sysdev/fsl_pci.c         |    9 +-
 arch/powerpc/sysdev/fsl_pci.h         |    2 +-
 drivers/iommu/Kconfig                 |    8 +
 drivers/iommu/Makefile                |    1 +
 drivers/iommu/fsl_pamu.c              | 1260 +++++++++++++++++++++++++++++++++
 drivers/iommu/fsl_pamu.h              |  398 +++++++++++
 drivers/iommu/fsl_pamu_domain.c       | 1135 +++++++++++++++++++++++++++++
 drivers/iommu/fsl_pamu_domain.h       |   89 +++
 drivers/iommu/iommu.c                 |    5 +-
 include/linux/iommu.h                 |   40 +-
 12 files changed, 2947 insertions(+), 8 deletions(-)
 create mode 100644 drivers/iommu/fsl_pamu.c
 create mode 100644 drivers/iommu/fsl_pamu.h
 create mode 100644 drivers/iommu/fsl_pamu_domain.c
 create mode 100644 drivers/iommu/fsl_pamu_domain.h

-- 
1.7.4.1

[PATCH 1/6 v8] iommu/fsl: Store iommu domain information pointer in archdata.

[Varun Sethi]

Add a new field in the device (powerpc) archdata structure for storing iommu domain
information pointer. This pointer is stored when the device is attached to a particular
domain.


Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
---
- no change.
 arch/powerpc/include/asm/device.h |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/include/asm/device.h b/arch/powerpc/include/asm/device.h
index 77e97dd..6dc79fe 100644
--- a/arch/powerpc/include/asm/device.h
+++ b/arch/powerpc/include/asm/device.h
@@ -28,6 +28,10 @@ struct dev_archdata {
 		void		*iommu_table_base;
 	} dma_data;
 
+	/* IOMMU domain information pointer. This would be set
+	 * when this device is attached to an iommu_domain.
+	 */
+	void			*iommu_domain;
 #ifdef CONFIG_SWIOTLB
 	dma_addr_t		max_direct_dma_addr;
 #endif
-- 
1.7.4.1

Re: [PATCH 1/6 v8] iommu/fsl: Store iommu domain information pointer in archdata.

[Joerg Roedel]

On Mon, Feb 18, 2013 at 06:22:14PM +0530, Varun Sethi wrote:
> Add a new field in the device (powerpc) archdata structure for storing iommu domain
> information pointer. This pointer is stored when the device is attached to a particular
> domain.
> 
> 
> Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
> ---
> - no change.
>  arch/powerpc/include/asm/device.h |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/device.h b/arch/powerpc/include/asm/device.h
> index 77e97dd..6dc79fe 100644
> --- a/arch/powerpc/include/asm/device.h
> +++ b/arch/powerpc/include/asm/device.h
> @@ -28,6 +28,10 @@ struct dev_archdata {
>  		void		*iommu_table_base;
>  	} dma_data;
>  
> +	/* IOMMU domain information pointer. This would be set
> +	 * when this device is attached to an iommu_domain.
> +	 */
> +	void			*iommu_domain;

Please Cc the PowerPC Maintainers on this, so that they can have a look
at it. This also must be put this into an #ifdef CONFIG_IOMMU_API.


	Joerg

RE: [PATCH 1/6 v8] iommu/fsl: Store iommu domain information pointer in archdata.

[Sethi Varun-B16395]

Hi Kumar,Ben,
I am implementing the Freescale PAMU (IOMMU) driver using the Linux IOMMU API. In this particular patch, I have added a new field to dev_archdata structure to store the dma domain information.
This field is updated whenever we attach a device to an iommu domain.

Regards
Varun

> -----Original Message-----
> From: Joerg Roedel [mailto:joro@8bytes.org]
> Sent: Wednesday, February 27, 2013 5:01 PM
> To: Sethi Varun-B16395
> Cc: iommu@lists.linux-foundation.org; linuxppc-dev@lists.ozlabs.org;
> linux-kernel@vger.kernel.org; Wood Scott-B07421; Yoder Stuart-B08248
> Subject: Re: [PATCH 1/6 v8] iommu/fsl: Store iommu domain information
> pointer in archdata.
> 
> On Mon, Feb 18, 2013 at 06:22:14PM +0530, Varun Sethi wrote:
> > Add a new field in the device (powerpc) archdata structure for storing
> > iommu domain information pointer. This pointer is stored when the
> > device is attached to a particular domain.
> >
> >
> > Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
> > ---
> > - no change.
> >  arch/powerpc/include/asm/device.h |    4 ++++
> >  1 files changed, 4 insertions(+), 0 deletions(-)
> >
> > diff --git a/arch/powerpc/include/asm/device.h
> > b/arch/powerpc/include/asm/device.h
> > index 77e97dd..6dc79fe 100644
> > --- a/arch/powerpc/include/asm/device.h
> > +++ b/arch/powerpc/include/asm/device.h
> > @@ -28,6 +28,10 @@ struct dev_archdata {
> >  		void		*iommu_table_base;
> >  	} dma_data;
> >
> > +	/* IOMMU domain information pointer. This would be set
> > +	 * when this device is attached to an iommu_domain.
> > +	 */
> > +	void			*iommu_domain;
> 
> Please Cc the PowerPC Maintainers on this, so that they can have a look
> at it. This also must be put this into an #ifdef CONFIG_IOMMU_API.
> 
> 
> 	Joerg
> 
> 

Re: [PATCH 1/6 v8] iommu/fsl: Store iommu domain information pointer in archdata.

[Kumar Gala]

On Feb 27, 2013, at 6:04 AM, Sethi Varun-B16395 wrote:

> Hi Kumar,Ben,
> I am implementing the Freescale PAMU (IOMMU) driver using the Linux IOMMU API. In this particular patch, I have added a new field to dev_archdata structure to store the dma domain information.
> This field is updated whenever we attach a device to an iommu domain.
> 
> Regards
> Varun

Would be good to see if this overlaps with Alexey's work for IOMMU driver for powernv.

- k

> 
>> -----Original Message-----
>> From: Joerg Roedel [mailto:joro@8bytes.org]
>> Sent: Wednesday, February 27, 2013 5:01 PM
>> To: Sethi Varun-B16395
>> Cc: iommu@lists.linux-foundation.org; linuxppc-dev@lists.ozlabs.org;
>> linux-kernel@vger.kernel.org; Wood Scott-B07421; Yoder Stuart-B08248
>> Subject: Re: [PATCH 1/6 v8] iommu/fsl: Store iommu domain information
>> pointer in archdata.
>> 
>> On Mon, Feb 18, 2013 at 06:22:14PM +0530, Varun Sethi wrote:
>>> Add a new field in the device (powerpc) archdata structure for storing
>>> iommu domain information pointer. This pointer is stored when the
>>> device is attached to a particular domain.
>>> 
>>> 
>>> Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
>>> ---
>>> - no change.
>>> arch/powerpc/include/asm/device.h |    4 ++++
>>> 1 files changed, 4 insertions(+), 0 deletions(-)
>>> 
>>> diff --git a/arch/powerpc/include/asm/device.h
>>> b/arch/powerpc/include/asm/device.h
>>> index 77e97dd..6dc79fe 100644
>>> --- a/arch/powerpc/include/asm/device.h
>>> +++ b/arch/powerpc/include/asm/device.h
>>> @@ -28,6 +28,10 @@ struct dev_archdata {
>>> 		void		*iommu_table_base;
>>> 	} dma_data;
>>> 
>>> +	/* IOMMU domain information pointer. This would be set
>>> +	 * when this device is attached to an iommu_domain.
>>> +	 */
>>> +	void			*iommu_domain;
>> 
>> Please Cc the PowerPC Maintainers on this, so that they can have a look
>> at it. This also must be put this into an #ifdef CONFIG_IOMMU_API.
>> 
>> 
>> 	Joerg
>> 
>> 
> 
> 
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Re: [PATCH 1/6 v8] iommu/fsl: Store iommu domain information pointer in archdata.

[Alexey Kardashevskiy]

Hi!

On POWERNV we use only the part of IOMMU API which handles devices and 
groups. We do not use IOMMU domains as VFIO containers do everything we 
need for VFIO and we do not implement iommu_ops as it is not very relevant 
to our architecture (does not give dma window properties, etc).

So your work does not overlap with my work :)


On 01/03/13 02:51, Kumar Gala wrote:
>
> On Feb 27, 2013, at 6:04 AM, Sethi Varun-B16395 wrote:
>
>> Hi Kumar,Ben,
>> I am implementing the Freescale PAMU (IOMMU) driver using the Linux IOMMU API. In this particular patch, I have added a new field to dev_archdata structure to store the dma domain information.
>> This field is updated whenever we attach a device to an iommu domain.
>>
>> Regards
>> Varun
>
> Would be good to see if this overlaps with Alexey's work for IOMMU driver for powernv.
>
> - k
>
>>
>>> -----Original Message-----
>>> From: Joerg Roedel [mailto:joro@8bytes.org]
>>> Sent: Wednesday, February 27, 2013 5:01 PM
>>> To: Sethi Varun-B16395
>>> Cc: iommu@lists.linux-foundation.org; linuxppc-dev@lists.ozlabs.org;
>>> linux-kernel@vger.kernel.org; Wood Scott-B07421; Yoder Stuart-B08248
>>> Subject: Re: [PATCH 1/6 v8] iommu/fsl: Store iommu domain information
>>> pointer in archdata.
>>>
>>> On Mon, Feb 18, 2013 at 06:22:14PM +0530, Varun Sethi wrote:
>>>> Add a new field in the device (powerpc) archdata structure for storing
>>>> iommu domain information pointer. This pointer is stored when the
>>>> device is attached to a particular domain.
>>>>
>>>>
>>>> Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
>>>> ---
>>>> - no change.
>>>> arch/powerpc/include/asm/device.h |    4 ++++
>>>> 1 files changed, 4 insertions(+), 0 deletions(-)
>>>>
>>>> diff --git a/arch/powerpc/include/asm/device.h
>>>> b/arch/powerpc/include/asm/device.h
>>>> index 77e97dd..6dc79fe 100644
>>>> --- a/arch/powerpc/include/asm/device.h
>>>> +++ b/arch/powerpc/include/asm/device.h
>>>> @@ -28,6 +28,10 @@ struct dev_archdata {
>>>> 		void		*iommu_table_base;
>>>> 	} dma_data;
>>>>
>>>> +	/* IOMMU domain information pointer. This would be set
>>>> +	 * when this device is attached to an iommu_domain.
>>>> +	 */
>>>> +	void			*iommu_domain;
>>>
>>> Please Cc the PowerPC Maintainers on this, so that they can have a look
>>> at it. This also must be put this into an #ifdef CONFIG_IOMMU_API.


-- 
Alexey	

RE: [PATCH 1/6 v8] iommu/fsl: Store iommu domain information pointer in archdata.

[Sethi Varun-B16395]

Thanks for the clarification Alexey.

Kumar,
We are using this new field (for PAMU) to store the iommu domain (for iommu API) information for a device.

Regards
Varun

> -----Original Message-----
> From: Alexey Kardashevskiy [mailto:aik@ozlabs.ru]
> Sent: Friday, March 01, 2013 6:55 AM
> To: Kumar Gala
> Cc: Sethi Varun-B16395; Benjamin Herrenschmidt; iommu@lists.linux-
> foundation.org; linuxppc-dev@lists.ozlabs.org list; linux-
> kernel@vger.kernel.org list; Wood Scott-B07421; Yoder Stuart-B08248;
> Joerg Roedel; Paul Mackerras; David Gibson; Alex Williamson
> Subject: Re: [PATCH 1/6 v8] iommu/fsl: Store iommu domain information
> pointer in archdata.
> 
> Hi!
> 
> On POWERNV we use only the part of IOMMU API which handles devices and
> groups. We do not use IOMMU domains as VFIO containers do everything we
> need for VFIO and we do not implement iommu_ops as it is not very
> relevant to our architecture (does not give dma window properties, etc).
> 
> So your work does not overlap with my work :)
> 
> 
> On 01/03/13 02:51, Kumar Gala wrote:
> >
> > On Feb 27, 2013, at 6:04 AM, Sethi Varun-B16395 wrote:
> >
> >> Hi Kumar,Ben,
> >> I am implementing the Freescale PAMU (IOMMU) driver using the Linux
> IOMMU API. In this particular patch, I have added a new field to
> dev_archdata structure to store the dma domain information.
> >> This field is updated whenever we attach a device to an iommu domain.
> >>
> >> Regards
> >> Varun
> >
> > Would be good to see if this overlaps with Alexey's work for IOMMU
> driver for powernv.
> >
> > - k
> >
> >>
> >>> -----Original Message-----
> >>> From: Joerg Roedel [mailto:joro@8bytes.org]
> >>> Sent: Wednesday, February 27, 2013 5:01 PM
> >>> To: Sethi Varun-B16395
> >>> Cc: iommu@lists.linux-foundation.org; linuxppc-dev@lists.ozlabs.org;
> >>> linux-kernel@vger.kernel.org; Wood Scott-B07421; Yoder Stuart-B08248
> >>> Subject: Re: [PATCH 1/6 v8] iommu/fsl: Store iommu domain
> >>> information pointer in archdata.
> >>>
> >>> On Mon, Feb 18, 2013 at 06:22:14PM +0530, Varun Sethi wrote:
> >>>> Add a new field in the device (powerpc) archdata structure for
> >>>> storing iommu domain information pointer. This pointer is stored
> >>>> when the device is attached to a particular domain.
> >>>>
> >>>>
> >>>> Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
> >>>> ---
> >>>> - no change.
> >>>> arch/powerpc/include/asm/device.h |    4 ++++
> >>>> 1 files changed, 4 insertions(+), 0 deletions(-)
> >>>>
> >>>> diff --git a/arch/powerpc/include/asm/device.h
> >>>> b/arch/powerpc/include/asm/device.h
> >>>> index 77e97dd..6dc79fe 100644
> >>>> --- a/arch/powerpc/include/asm/device.h
> >>>> +++ b/arch/powerpc/include/asm/device.h
> >>>> @@ -28,6 +28,10 @@ struct dev_archdata {
> >>>> 		void		*iommu_table_base;
> >>>> 	} dma_data;
> >>>>
> >>>> +	/* IOMMU domain information pointer. This would be set
> >>>> +	 * when this device is attached to an iommu_domain.
> >>>> +	 */
> >>>> +	void			*iommu_domain;
> >>>
> >>> Please Cc the PowerPC Maintainers on this, so that they can have a
> >>> look at it. This also must be put this into an #ifdef
> CONFIG_IOMMU_API.
> 
> 
> --
> Alexey

Re: [PATCH 1/6 v8] iommu/fsl: Store iommu domain information pointer in archdata.

[Alexey Kardashevskiy]

btw the device struct already has a pointer to its iommu_group, and the 
iommu_group struct itself has a pointer void *iommu_data which you could 
use for anything you want (iommu_group_get_iommudata(), 
iommu_group_set_iommudata()).

By design you are expected to add iommu groups to a domain but not devices 
so I am not so sure that you really need a pointer to domain in the device 
struct.


On 01/03/13 19:55, Sethi Varun-B16395 wrote:
> Thanks for the clarification Alexey.
>
> Kumar,
> We are using this new field (for PAMU) to store the iommu domain (for iommu API) information for a device.
>
> Regards
> Varun
>
>> -----Original Message-----
>> From: Alexey Kardashevskiy [mailto:aik@ozlabs.ru]
>> Sent: Friday, March 01, 2013 6:55 AM
>> To: Kumar Gala
>> Cc: Sethi Varun-B16395; Benjamin Herrenschmidt; iommu@lists.linux-
>> foundation.org; linuxppc-dev@lists.ozlabs.org list; linux-
>> kernel@vger.kernel.org list; Wood Scott-B07421; Yoder Stuart-B08248;
>> Joerg Roedel; Paul Mackerras; David Gibson; Alex Williamson
>> Subject: Re: [PATCH 1/6 v8] iommu/fsl: Store iommu domain information
>> pointer in archdata.
>>
>> Hi!
>>
>> On POWERNV we use only the part of IOMMU API which handles devices and
>> groups. We do not use IOMMU domains as VFIO containers do everything we
>> need for VFIO and we do not implement iommu_ops as it is not very
>> relevant to our architecture (does not give dma window properties, etc).
>>
>> So your work does not overlap with my work :)
>>
>>
>> On 01/03/13 02:51, Kumar Gala wrote:
>>>
>>> On Feb 27, 2013, at 6:04 AM, Sethi Varun-B16395 wrote:
>>>
>>>> Hi Kumar,Ben,
>>>> I am implementing the Freescale PAMU (IOMMU) driver using the Linux
>> IOMMU API. In this particular patch, I have added a new field to
>> dev_archdata structure to store the dma domain information.
>>>> This field is updated whenever we attach a device to an iommu domain.
>>>>
>>>> Regards
>>>> Varun
>>>
>>> Would be good to see if this overlaps with Alexey's work for IOMMU
>> driver for powernv.
>>>
>>> - k
>>>
>>>>
>>>>> -----Original Message-----
>>>>> From: Joerg Roedel [mailto:joro@8bytes.org]
>>>>> Sent: Wednesday, February 27, 2013 5:01 PM
>>>>> To: Sethi Varun-B16395
>>>>> Cc: iommu@lists.linux-foundation.org; linuxppc-dev@lists.ozlabs.org;
>>>>> linux-kernel@vger.kernel.org; Wood Scott-B07421; Yoder Stuart-B08248
>>>>> Subject: Re: [PATCH 1/6 v8] iommu/fsl: Store iommu domain
>>>>> information pointer in archdata.
>>>>>
>>>>> On Mon, Feb 18, 2013 at 06:22:14PM +0530, Varun Sethi wrote:
>>>>>> Add a new field in the device (powerpc) archdata structure for
>>>>>> storing iommu domain information pointer. This pointer is stored
>>>>>> when the device is attached to a particular domain.
>>>>>>
>>>>>>
>>>>>> Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
>>>>>> ---
>>>>>> - no change.
>>>>>> arch/powerpc/include/asm/device.h |    4 ++++
>>>>>> 1 files changed, 4 insertions(+), 0 deletions(-)
>>>>>>
>>>>>> diff --git a/arch/powerpc/include/asm/device.h
>>>>>> b/arch/powerpc/include/asm/device.h
>>>>>> index 77e97dd..6dc79fe 100644
>>>>>> --- a/arch/powerpc/include/asm/device.h
>>>>>> +++ b/arch/powerpc/include/asm/device.h
>>>>>> @@ -28,6 +28,10 @@ struct dev_archdata {
>>>>>> 		void		*iommu_table_base;
>>>>>> 	} dma_data;
>>>>>>
>>>>>> +	/* IOMMU domain information pointer. This would be set
>>>>>> +	 * when this device is attached to an iommu_domain.
>>>>>> +	 */
>>>>>> +	void			*iommu_domain;
>>>>>
>>>>> Please Cc the PowerPC Maintainers on this, so that they can have a
>>>>> look at it. This also must be put this into an #ifdef
>> CONFIG_IOMMU_API.


-- 
Alexey

RE: [PATCH 1/6 v8] iommu/fsl: Store iommu domain information pointer in archdata.

[Yoder Stuart-B08248]

> -----Original Message-----
> From: Alexey Kardashevskiy [mailto:aik@ozlabs.ru]
> Sent: Friday, March 01, 2013 4:07 AM
> To: Sethi Varun-B16395
> Cc: Kumar Gala; Benjamin Herrenschmidt; iommu@lists.linux-foundation.org; linuxppc-dev@lists.ozlabs.org
> list; linux-kernel@vger.kernel.org list; Wood Scott-B07421; Yoder Stuart-B08248; Joerg Roedel; Paul
> Mackerras; David Gibson; Alex Williamson
> Subject: Re: [PATCH 1/6 v8] iommu/fsl: Store iommu domain information pointer in archdata.
> 
> btw the device struct already has a pointer to its iommu_group, and the
> iommu_group struct itself has a pointer void *iommu_data which you could
> use for anything you want (iommu_group_get_iommudata(),
> iommu_group_set_iommudata()).
>
> By design you are expected to add iommu groups to a domain but not devices
> so I am not so sure that you really need a pointer to domain in the device
> struct.

Well, at the lowest level the IOMMU API does attach devices to domains-- i.e.
API attach_dev().  So, it seems to conceptually make sense to have a ptr
from the device to the associated domain.  When you implement attach_dev()
you need to be able to see whether the device is already attached to
a domain.   Adding a couple of levels of indirection...from device to
group to domain...doesn't seems to make things simpler or better IMHO.

x86 keeps a pointer to the domain in device archdata and since there is
a direct correlation between a device and domain I'd rather see it
where this patch has it.

Stuart

RE: [PATCH 1/6 v8] iommu/fsl: Store iommu domain information pointer in archdata.

[Sethi Varun-B16395]

> -----Original Message-----
> From: Yoder Stuart-B08248
> Sent: Friday, March 01, 2013 9:52 PM
> To: Alexey Kardashevskiy; Sethi Varun-B16395
> Cc: Kumar Gala; Benjamin Herrenschmidt; iommu@lists.linux-foundation.org;
> linuxppc-dev@lists.ozlabs.org list; linux-kernel@vger.kernel.org list;
> Wood Scott-B07421; Joerg Roedel; Paul Mackerras; David Gibson; Alex
> Williamson
> Subject: RE: [PATCH 1/6 v8] iommu/fsl: Store iommu domain information
> pointer in archdata.
> 
> 
> 
> > -----Original Message-----
> > From: Alexey Kardashevskiy [mailto:aik@ozlabs.ru]
> > Sent: Friday, March 01, 2013 4:07 AM
> > To: Sethi Varun-B16395
> > Cc: Kumar Gala; Benjamin Herrenschmidt;
> > iommu@lists.linux-foundation.org; linuxppc-dev@lists.ozlabs.org list;
> > linux-kernel@vger.kernel.org list; Wood Scott-B07421; Yoder
> > Stuart-B08248; Joerg Roedel; Paul Mackerras; David Gibson; Alex
> > Williamson
> > Subject: Re: [PATCH 1/6 v8] iommu/fsl: Store iommu domain information
> pointer in archdata.
> >
> > btw the device struct already has a pointer to its iommu_group, and
> > the iommu_group struct itself has a pointer void *iommu_data which you
> > could use for anything you want (iommu_group_get_iommudata(),
> > iommu_group_set_iommudata()).
> >
> > By design you are expected to add iommu groups to a domain but not
> > devices so I am not so sure that you really need a pointer to domain
> > in the device struct.
> 
> Well, at the lowest level the IOMMU API does attach devices to domains--
> i.e.
> API attach_dev().  So, it seems to conceptually make sense to have a ptr
> from the device to the associated domain.  When you implement
> attach_dev() you need to be able to see whether the device is already
> attached to
> a domain.   Adding a couple of levels of indirection...from device to
> group to domain...doesn't seems to make things simpler or better IMHO.
> 
> x86 keeps a pointer to the domain in device archdata and since there is a
> direct correlation between a device and domain I'd rather see it where
> this patch has it.
> 

As Stuart stated this allows us to maintain the device <-> domain relationship at the lowest level.

-Varun

[PATCH 2/6] powerpc/fsl_pci: Store the platform device information corresponding to the pci controller.

[Varun Sethi]

The pci controller structure has a provision to store the device strcuture
pointer of the corresponding platform device. Currently this information is
not stored during fsl pci controller initialization. This information is
required while dealing with iommu groups for pci devices connected to the fsl
pci controller. For the case where the pci devices can't be paritioned, they
would fall under the same device group as the pci controller.

This patch stores the platform device information in the pci controller
structure during initialization.

Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
---
 arch/powerpc/sysdev/fsl_pci.c |    9 +++++++--
 arch/powerpc/sysdev/fsl_pci.h |    2 +-
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index 92a5915..b393ae7 100644
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c
@@ -421,13 +421,16 @@ void fsl_pcibios_fixup_bus(struct pci_bus *bus)
 	}
 }
 
-int __init fsl_add_bridge(struct device_node *dev, int is_primary)
+int __init fsl_add_bridge(struct platform_device *pdev, int is_primary)
 {
 	int len;
 	struct pci_controller *hose;
 	struct resource rsrc;
 	const int *bus_range;
 	u8 hdr_type, progif;
+	struct device_node *dev;
+
+	dev = pdev->dev.of_node;
 
 	if (!of_device_is_available(dev)) {
 		pr_warning("%s: disabled\n", dev->full_name);
@@ -453,6 +456,8 @@ int __init fsl_add_bridge(struct device_node *dev, int is_primary)
 	if (!hose)
 		return -ENOMEM;
 
+	/* set platform device as the parent */
+	hose->parent = &pdev->dev;
 	hose->first_busno = bus_range ? bus_range[0] : 0x0;
 	hose->last_busno = bus_range ? bus_range[1] : 0xff;
 
@@ -880,7 +885,7 @@ static int fsl_pci_probe(struct platform_device *pdev)
 #endif
 
 	node = pdev->dev.of_node;
-	ret = fsl_add_bridge(node, fsl_pci_primary == node);
+	ret = fsl_add_bridge(pdev, fsl_pci_primary == node);
 
 #ifdef CONFIG_SWIOTLB
 	if (ret == 0) {
diff --git a/arch/powerpc/sysdev/fsl_pci.h b/arch/powerpc/sysdev/fsl_pci.h
index d078537..c495c00 100644
--- a/arch/powerpc/sysdev/fsl_pci.h
+++ b/arch/powerpc/sysdev/fsl_pci.h
@@ -91,7 +91,7 @@ struct ccsr_pci {
 	__be32	pex_err_cap_r3;		/* 0x.e34 - PCIE error capture register 0 */
 };
 
-extern int fsl_add_bridge(struct device_node *dev, int is_primary);
+extern int fsl_add_bridge(struct platform_device *pdev, int is_primary);
 extern void fsl_pcibios_fixup_bus(struct pci_bus *bus);
 extern int mpc83xx_add_bridge(struct device_node *dev);
 u64 fsl_pci_immrbar_base(struct pci_controller *hose);
-- 
1.7.4.1

Re: [PATCH 2/6] powerpc/fsl_pci: Store the platform device information corresponding to the pci controller.

[Stuart Yoder]

This patch was submitted separately to linuxppc-dev (and was already
applied).  You don't need it in this patch set, right?

Stuart

On Mon, Feb 18, 2013 at 6:52 AM, Varun Sethi <Varun.Sethi@freescale.com> wrote:
> The pci controller structure has a provision to store the device strcuture
> pointer of the corresponding platform device. Currently this information is
> not stored during fsl pci controller initialization. This information is
> required while dealing with iommu groups for pci devices connected to the fsl
> pci controller. For the case where the pci devices can't be paritioned, they
> would fall under the same device group as the pci controller.
>
> This patch stores the platform device information in the pci controller
> structure during initialization.
>
> Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
> ---
>  arch/powerpc/sysdev/fsl_pci.c |    9 +++++++--
>  arch/powerpc/sysdev/fsl_pci.h |    2 +-
>  2 files changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
> index 92a5915..b393ae7 100644
> --- a/arch/powerpc/sysdev/fsl_pci.c
> +++ b/arch/powerpc/sysdev/fsl_pci.c
> @@ -421,13 +421,16 @@ void fsl_pcibios_fixup_bus(struct pci_bus *bus)
>         }
>  }
>
> -int __init fsl_add_bridge(struct device_node *dev, int is_primary)
> +int __init fsl_add_bridge(struct platform_device *pdev, int is_primary)
>  {
>         int len;
>         struct pci_controller *hose;
>         struct resource rsrc;
>         const int *bus_range;
>         u8 hdr_type, progif;
> +       struct device_node *dev;
> +
> +       dev = pdev->dev.of_node;
>
>         if (!of_device_is_available(dev)) {
>                 pr_warning("%s: disabled\n", dev->full_name);
> @@ -453,6 +456,8 @@ int __init fsl_add_bridge(struct device_node *dev, int is_primary)
>         if (!hose)
>                 return -ENOMEM;
>
> +       /* set platform device as the parent */
> +       hose->parent = &pdev->dev;
>         hose->first_busno = bus_range ? bus_range[0] : 0x0;
>         hose->last_busno = bus_range ? bus_range[1] : 0xff;
>
> @@ -880,7 +885,7 @@ static int fsl_pci_probe(struct platform_device *pdev)
>  #endif
>
>         node = pdev->dev.of_node;
> -       ret = fsl_add_bridge(node, fsl_pci_primary == node);
> +       ret = fsl_add_bridge(pdev, fsl_pci_primary == node);
>
>  #ifdef CONFIG_SWIOTLB
>         if (ret == 0) {
> diff --git a/arch/powerpc/sysdev/fsl_pci.h b/arch/powerpc/sysdev/fsl_pci.h
> index d078537..c495c00 100644
> --- a/arch/powerpc/sysdev/fsl_pci.h
> +++ b/arch/powerpc/sysdev/fsl_pci.h
> @@ -91,7 +91,7 @@ struct ccsr_pci {
>         __be32  pex_err_cap_r3;         /* 0x.e34 - PCIE error capture register 0 */
>  };
>
> -extern int fsl_add_bridge(struct device_node *dev, int is_primary);
> +extern int fsl_add_bridge(struct platform_device *pdev, int is_primary);
>  extern void fsl_pcibios_fixup_bus(struct pci_bus *bus);
>  extern int mpc83xx_add_bridge(struct device_node *dev);
>  u64 fsl_pci_immrbar_base(struct pci_controller *hose);
> --
> 1.7.4.1
>
>
> _______________________________________________
> iommu mailing list
> iommu@lists.linux-foundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/iommu

RE: [PATCH 2/6] powerpc/fsl_pci: Store the platform device information corresponding to the pci controller.

[Sethi Varun-B16395]

This patch is not present in Joerg's tree and the add_device API in the PAMU driver requires this patch.

-Varun

> -----Original Message-----
> From: Stuart Yoder [mailto:b08248@gmail.com]
> Sent: Tuesday, February 26, 2013 5:39 AM
> To: Sethi Varun-B16395
> Cc: iommu@lists.linux-foundation.org; linuxppc-dev@lists.ozlabs.org;
> linux-kernel@vger.kernel.org; Wood Scott-B07421; Joerg Roedel; Yoder
> Stuart-B08248
> Subject: Re: [PATCH 2/6] powerpc/fsl_pci: Store the platform device
> information corresponding to the pci controller.
> 
> This patch was submitted separately to linuxppc-dev (and was already
> applied).  You don't need it in this patch set, right?
> 
> Stuart
> 
> On Mon, Feb 18, 2013 at 6:52 AM, Varun Sethi <Varun.Sethi@freescale.com>
> wrote:
> > The pci controller structure has a provision to store the device
> > strcuture pointer of the corresponding platform device. Currently this
> > information is not stored during fsl pci controller initialization.
> > This information is required while dealing with iommu groups for pci
> > devices connected to the fsl pci controller. For the case where the
> > pci devices can't be paritioned, they would fall under the same device
> group as the pci controller.
> >
> > This patch stores the platform device information in the pci
> > controller structure during initialization.
> >
> > Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
> > ---
> >  arch/powerpc/sysdev/fsl_pci.c |    9 +++++++--
> >  arch/powerpc/sysdev/fsl_pci.h |    2 +-
> >  2 files changed, 8 insertions(+), 3 deletions(-)
> >
> > diff --git a/arch/powerpc/sysdev/fsl_pci.c
> > b/arch/powerpc/sysdev/fsl_pci.c index 92a5915..b393ae7 100644
> > --- a/arch/powerpc/sysdev/fsl_pci.c
> > +++ b/arch/powerpc/sysdev/fsl_pci.c
> > @@ -421,13 +421,16 @@ void fsl_pcibios_fixup_bus(struct pci_bus *bus)
> >         }
> >  }
> >
> > -int __init fsl_add_bridge(struct device_node *dev, int is_primary)
> > +int __init fsl_add_bridge(struct platform_device *pdev, int
> > +is_primary)
> >  {
> >         int len;
> >         struct pci_controller *hose;
> >         struct resource rsrc;
> >         const int *bus_range;
> >         u8 hdr_type, progif;
> > +       struct device_node *dev;
> > +
> > +       dev = pdev->dev.of_node;
> >
> >         if (!of_device_is_available(dev)) {
> >                 pr_warning("%s: disabled\n", dev->full_name); @@
> > -453,6 +456,8 @@ int __init fsl_add_bridge(struct device_node *dev, int
> is_primary)
> >         if (!hose)
> >                 return -ENOMEM;
> >
> > +       /* set platform device as the parent */
> > +       hose->parent = &pdev->dev;
> >         hose->first_busno = bus_range ? bus_range[0] : 0x0;
> >         hose->last_busno = bus_range ? bus_range[1] : 0xff;
> >
> > @@ -880,7 +885,7 @@ static int fsl_pci_probe(struct platform_device
> > *pdev)  #endif
> >
> >         node = pdev->dev.of_node;
> > -       ret = fsl_add_bridge(node, fsl_pci_primary == node);
> > +       ret = fsl_add_bridge(pdev, fsl_pci_primary == node);
> >
> >  #ifdef CONFIG_SWIOTLB
> >         if (ret == 0) {
> > diff --git a/arch/powerpc/sysdev/fsl_pci.h
> > b/arch/powerpc/sysdev/fsl_pci.h index d078537..c495c00 100644
> > --- a/arch/powerpc/sysdev/fsl_pci.h
> > +++ b/arch/powerpc/sysdev/fsl_pci.h
> > @@ -91,7 +91,7 @@ struct ccsr_pci {
> >         __be32  pex_err_cap_r3;         /* 0x.e34 - PCIE error capture
> register 0 */
> >  };
> >
> > -extern int fsl_add_bridge(struct device_node *dev, int is_primary);
> > +extern int fsl_add_bridge(struct platform_device *pdev, int
> > +is_primary);
> >  extern void fsl_pcibios_fixup_bus(struct pci_bus *bus);  extern int
> > mpc83xx_add_bridge(struct device_node *dev);
> >  u64 fsl_pci_immrbar_base(struct pci_controller *hose);
> > --
> > 1.7.4.1
> >
> >
> > _______________________________________________
> > iommu mailing list
> > iommu@lists.linux-foundation.org
> > https://lists.linuxfoundation.org/mailman/listinfo/iommu

Re: [PATCH 2/6] powerpc/fsl_pci: Store the platform device information corresponding to the pci controller.

[Joerg Roedel]

On Tue, Feb 26, 2013 at 06:16:10AM +0000, Sethi Varun-B16395 wrote:
> This patch is not present in Joerg's tree and the add_device API in
> the PAMU driver requires this patch.

Will this patch be part of v3.9-rc1?


	Joerg

RE: [PATCH 2/6] powerpc/fsl_pci: Store the platform device information corresponding to the pci controller.

[Sethi Varun-B16395]

This patch is present in the "next branch" of linux ppc tree maintained by Kumar Gala.
Following is the commit id:
52c5affc545053d37c0b05224bbf70f5336caa20

I am not sure if this would be part of 3.9-rc1.

Regards
varun

> -----Original Message-----
> From: Joerg Roedel [mailto:joro@8bytes.org]
> Sent: Wednesday, February 27, 2013 4:15 PM
> To: Sethi Varun-B16395
> Cc: Stuart Yoder; iommu@lists.linux-foundation.org; linuxppc-
> dev@lists.ozlabs.org; linux-kernel@vger.kernel.org; Wood Scott-B07421;
> Yoder Stuart-B08248
> Subject: Re: [PATCH 2/6] powerpc/fsl_pci: Store the platform device
> information corresponding to the pci controller.
> 
> On Tue, Feb 26, 2013 at 06:16:10AM +0000, Sethi Varun-B16395 wrote:
> > This patch is not present in Joerg's tree and the add_device API in
> > the PAMU driver requires this patch.
> 
> Will this patch be part of v3.9-rc1?
> 
> 
> 	Joerg
> 
> 

Re: [PATCH 2/6] powerpc/fsl_pci: Store the platform device information corresponding to the pci controller.

[Kumar Gala]

On Feb 27, 2013, at 4:56 AM, Sethi Varun-B16395 wrote:

> This patch is present in the "next branch" of linux ppc tree maintained by Kumar Gala.
> Following is the commit id:
> 52c5affc545053d37c0b05224bbf70f5336caa20
> 
> I am not sure if this would be part of 3.9-rc1.
> 
> Regards
> varun

This is now in Linus's tree so will be in 3.9-rc1

- k

RE: [PATCH 2/6] powerpc/fsl_pci: Store the platform device information corresponding to the pci controller.

[Sethi Varun-B16395]

Hi Joerg,
I have to post the next version of my patchset, should I base it on top of 3.9-rc1?
By when would you move the iommu git tree to 3.9-rc1?

Regards
Varun

> -----Original Message-----
> From: Kumar Gala [mailto:galak@kernel.crashing.org]
> Sent: Thursday, February 28, 2013 9:15 PM
> To: Sethi Varun-B16395
> Cc: Joerg Roedel; Stuart Yoder; iommu@lists.linux-foundation.org;
> linuxppc-dev@lists.ozlabs.org; linux-kernel@vger.kernel.org; Wood Scott-
> B07421; Yoder Stuart-B08248
> Subject: Re: [PATCH 2/6] powerpc/fsl_pci: Store the platform device
> information corresponding to the pci controller.
> 
> 
> On Feb 27, 2013, at 4:56 AM, Sethi Varun-B16395 wrote:
> 
> > This patch is present in the "next branch" of linux ppc tree maintained
> by Kumar Gala.
> > Following is the commit id:
> > 52c5affc545053d37c0b05224bbf70f5336caa20
> >
> > I am not sure if this would be part of 3.9-rc1.
> >
> > Regards
> > varun
> 
> This is now in Linus's tree so will be in 3.9-rc1
> 
> - k
> 

Re: [PATCH 2/6] powerpc/fsl_pci: Store the platform device information corresponding to the pci controller.

[Joerg Roedel]

Yes, please base your patches on the latest upstream-tag. I will move my
tree to v3.9-rc1 soon, there are some fixes that need to go upstream.

On Thu, Mar 07, 2013 at 09:14:21AM +0000, Sethi Varun-B16395 wrote:
> Hi Joerg,
> I have to post the next version of my patchset, should I base it on top of 3.9-rc1?
> By when would you move the iommu git tree to 3.9-rc1?
> 
> Regards
> Varun
> 
> > -----Original Message-----
> > From: Kumar Gala [mailto:galak@kernel.crashing.org]
> > Sent: Thursday, February 28, 2013 9:15 PM
> > To: Sethi Varun-B16395
> > Cc: Joerg Roedel; Stuart Yoder; iommu@lists.linux-foundation.org;
> > linuxppc-dev@lists.ozlabs.org; linux-kernel@vger.kernel.org; Wood Scott-
> > B07421; Yoder Stuart-B08248
> > Subject: Re: [PATCH 2/6] powerpc/fsl_pci: Store the platform device
> > information corresponding to the pci controller.
> > 
> > 
> > On Feb 27, 2013, at 4:56 AM, Sethi Varun-B16395 wrote:
> > 
> > > This patch is present in the "next branch" of linux ppc tree maintained
> > by Kumar Gala.
> > > Following is the commit id:
> > > 52c5affc545053d37c0b05224bbf70f5336caa20
> > >
> > > I am not sure if this would be part of 3.9-rc1.
> > >
> > > Regards
> > > varun
> > 
> > This is now in Linus's tree so will be in 3.9-rc1
> > 
> > - k
> > 
> 
> 

[PATCH 3/6] powerpc/fsl_pci: Added defines for the FSL PCI controller BRR1 register.

[Varun Sethi]

Macros for checking FSL PCI controller version.

Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
---
 arch/powerpc/include/asm/pci-bridge.h |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/include/asm/pci-bridge.h b/arch/powerpc/include/asm/pci-bridge.h
index 025a130..c12ed78 100644
--- a/arch/powerpc/include/asm/pci-bridge.h
+++ b/arch/powerpc/include/asm/pci-bridge.h
@@ -14,6 +14,10 @@
 
 struct device_node;
 
+/* FSL PCI controller BRR1 register */
+#define PCI_FSL_BRR1      0xbf8
+#define PCI_FSL_BRR1_VER 0xffff
+
 /*
  * Structure of a PCI controller (host bridge)
  */
-- 
1.7.4.1

Re: [PATCH 3/6] powerpc/fsl_pci: Added defines for the FSL PCI controller BRR1 register.

[Joerg Roedel]

On Mon, Feb 18, 2013 at 06:22:16PM +0530, Varun Sethi wrote:
> Macros for checking FSL PCI controller version.
> 
> Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
> ---
>  arch/powerpc/include/asm/pci-bridge.h |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/pci-bridge.h b/arch/powerpc/include/asm/pci-bridge.h
> index 025a130..c12ed78 100644
> --- a/arch/powerpc/include/asm/pci-bridge.h
> +++ b/arch/powerpc/include/asm/pci-bridge.h
> @@ -14,6 +14,10 @@
>  
>  struct device_node;
>  
> +/* FSL PCI controller BRR1 register */
> +#define PCI_FSL_BRR1      0xbf8
> +#define PCI_FSL_BRR1_VER 0xffff
> +


Please merge this patch with the one where you actually make use of
these defines for the first time.


	Joerg

Re: [PATCH 3/6] powerpc/fsl_pci: Added defines for the FSL PCI controller BRR1 register.

[Kumar Gala]

On Feb 27, 2013, at 5:33 AM, Joerg Roedel wrote:

> On Mon, Feb 18, 2013 at 06:22:16PM +0530, Varun Sethi wrote:
>> Macros for checking FSL PCI controller version.
>> 
>> Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
>> ---
>> arch/powerpc/include/asm/pci-bridge.h |    4 ++++
>> 1 files changed, 4 insertions(+), 0 deletions(-)
>> 
>> diff --git a/arch/powerpc/include/asm/pci-bridge.h b/arch/powerpc/include/asm/pci-bridge.h
>> index 025a130..c12ed78 100644
>> --- a/arch/powerpc/include/asm/pci-bridge.h
>> +++ b/arch/powerpc/include/asm/pci-bridge.h
>> @@ -14,6 +14,10 @@
>> 
>> struct device_node;
>> 
>> +/* FSL PCI controller BRR1 register */
>> +#define PCI_FSL_BRR1      0xbf8
>> +#define PCI_FSL_BRR1_VER 0xffff
>> +
> 
> 
> Please merge this patch with the one where you actually make use of
> these defines for the first time.
> 
> 
> 	Joerg

This also seems an odd place for these defines.

- k

[PATCH 4/6] iommu/fsl: Add window permission flags for iommu_domain_window_enable API.

[Varun Sethi]

Each iommu window can have access permissions associated with it. Extended the
window_enable API to incorporate window access permissions.

Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
---
 drivers/iommu/iommu.c |    5 +++--
 include/linux/iommu.h |    7 ++++---
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index b972d43..1a2564d 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -854,12 +854,13 @@ EXPORT_SYMBOL_GPL(iommu_unmap);
 
 
 int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
-			       phys_addr_t paddr, u64 size)
+			       phys_addr_t paddr, u64 size, int iommu_prot)
 {
 	if (unlikely(domain->ops->domain_window_enable == NULL))
 		return -ENODEV;
 
-	return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size);
+	return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size,
+						 iommu_prot);
 }
 EXPORT_SYMBOL_GPL(iommu_domain_window_enable);
 
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index ba3b8a9..529987c 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -105,7 +105,7 @@ struct iommu_ops {
 
 	/* Window handling functions */
 	int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
-				    phys_addr_t paddr, u64 size);
+				    phys_addr_t paddr, u64 size, int iommu_prot);
 	void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
 	/* Set the numer of window per domain */
 	int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
@@ -171,7 +171,8 @@ extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
 
 /* Window handling function prototypes */
 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
-				      phys_addr_t offset, u64 size);
+				      phys_addr_t offset, u64 size,
+				      int iommu_prot);
 extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
 /**
  * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
@@ -257,7 +258,7 @@ static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 
 static inline int iommu_domain_window_enable(struct iommu_domain *domain,
 					     u32 wnd_nr, phys_addr_t paddr,
-					     u64 size)
+					     u64 size, int iommu_prot)
 {
 	return -ENODEV;
 }
-- 
1.7.4.1

[PATCH 5/6 v8] iommu/fsl: Add addtional attributes specific to the PAMU driver.

[Varun Sethi]

Added the following domain attributes for the FSL PAMU driver:
1. Added new iommu stash attribute, which allows setting of the
   LIODN specific stash id parameter through IOMMU API.
2. Added an attribute for enabling/disabling DMA to a particular
   memory window.
3. Added domain attribute to check for PAMUV1 specific constraints.


Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
---
 include/linux/iommu.h |   33 +++++++++++++++++++++++++++++++++
 1 files changed, 33 insertions(+), 0 deletions(-)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 529987c..c44e38b 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -40,6 +40,23 @@ struct notifier_block;
 typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
 			struct device *, unsigned long, int, void *);
 
+/* cache stash targets */
+#define IOMMU_ATTR_CACHE_L1 1
+#define IOMMU_ATTR_CACHE_L2 2
+#define IOMMU_ATTR_CACHE_L3 3
+
+/* This attribute corresponds to IOMMUs capable of generating
+ * a stash transaction. A stash transaction is typically a
+ * hardware initiated prefetch of data from memory to cache.
+ * This attribute allows configuring stashig specific parameters
+ * in the IOMMU hardware.
+ */
+
+struct iommu_stash_attribute {
+	u32 	cpu;	/* cpu number */
+	u32 	cache;	/* cache to stash to: L1,L2,L3 */
+};
+
 struct iommu_domain_geometry {
 	dma_addr_t aperture_start; /* First address that can be mapped    */
 	dma_addr_t aperture_end;   /* Last address that can be mapped     */
@@ -57,10 +74,26 @@ struct iommu_domain {
 #define IOMMU_CAP_CACHE_COHERENCY	0x1
 #define IOMMU_CAP_INTR_REMAP		0x2	/* isolates device intrs */
 
+/*
+ * Following constraints are specifc to PAMUV1:
+ *  -aperture must be power of 2, and naturally aligned
+ *  -number of windows must be power of 2, and address space size
+ *   of each window is determined by aperture size / # of windows
+ *  -the actual size of the mapped region of a window must be power
+ *   of 2 starting with 4KB and physical address must be naturally
+ *   aligned.
+ * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
+ * The caller can invoke iommu_domain_get_attr to check if the underlying
+ * iommu implementation supports these constraints.
+ */
+
 enum iommu_attr {
 	DOMAIN_ATTR_GEOMETRY,
 	DOMAIN_ATTR_PAGING,
 	DOMAIN_ATTR_WINDOWS,
+	DOMAIN_ATTR_PAMU_STASH,
+	DOMAIN_ATTR_PAMU_ENABLE,
+	DOMAIN_ATTR_FSL_PAMUV1,
 	DOMAIN_ATTR_MAX,
 };
 
-- 
1.7.4.1

Re: [PATCH 5/6 v8] iommu/fsl: Add addtional attributes specific to the PAMU driver.

[Joerg Roedel]

On Mon, Feb 18, 2013 at 06:22:18PM +0530, Varun Sethi wrote:
> Added the following domain attributes for the FSL PAMU driver:
> 1. Added new iommu stash attribute, which allows setting of the
>    LIODN specific stash id parameter through IOMMU API.
> 2. Added an attribute for enabling/disabling DMA to a particular
>    memory window.
> 3. Added domain attribute to check for PAMUV1 specific constraints.
> 
> 
> Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
> ---
>  include/linux/iommu.h |   33 +++++++++++++++++++++++++++++++++
>  1 files changed, 33 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 529987c..c44e38b 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -40,6 +40,23 @@ struct notifier_block;
>  typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
>  			struct device *, unsigned long, int, void *);
>  
> +/* cache stash targets */
> +#define IOMMU_ATTR_CACHE_L1 1
> +#define IOMMU_ATTR_CACHE_L2 2
> +#define IOMMU_ATTR_CACHE_L3 3
> +
> +/* This attribute corresponds to IOMMUs capable of generating
> + * a stash transaction. A stash transaction is typically a
> + * hardware initiated prefetch of data from memory to cache.
> + * This attribute allows configuring stashig specific parameters
> + * in the IOMMU hardware.
> + */
> +
> +struct iommu_stash_attribute {
> +	u32 	cpu;	/* cpu number */
> +	u32 	cache;	/* cache to stash to: L1,L2,L3 */
> +};

Please make the cache-attribute an enum instead of using defines.


	Joerg

[PATCH 6/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU API implementation.

[Varun Sethi]

Following is a brief description of the PAMU hardware:
PAMU determines what action to take and whether to authorize the action on
the basis of the memory address, a Logical IO Device Number (LIODN), and
PAACT table (logically) indexed by LIODN and address. Hardware devices which
need to access memory must provide an LIODN in addition to the memory address.

Peripheral Access Authorization and Control Tables (PAACTs) are the primary
data structures used by PAMU. A PAACT is a table of peripheral access
authorization and control entries (PAACE).Each PAACE defines the range of
I/O bus address space that is accessible by the LIOD and the associated access
capabilities.

There are two types of PAACTs: primary PAACT (PPAACT) and secondary PAACT 
(SPAACT).A given physical I/O device may be able to act as one or more
independent logical I/O devices (LIODs). Each such logical I/O device is
assigned an identifier called logical I/O device number (LIODN). A LIODN is
allocated a contiguous portion of the I/O bus address space called the DSA window
for performing DSA operations. The DSA window may optionally be divided into
multiple sub-windows, each of which may be used to map to a region in system
storage space. The first sub-window is referred to as the primary sub-window
and the remaining are called secondary sub-windows.

This patch provides the PAMU driver (fsl_pamu.c) and the corresponding IOMMU
API implementation (fsl_pamu_domain.c). The PAMU hardware driver (fsl_pamu.c)
has been derived from the work done by Ashish Kalra and Timur Tabi.


Signed-off-by: Timur Tabi

Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
---
changes in v8:
- implemented the new API for window based IOMMUs.
changes in v7:
- Set max_subwidows in the geometry attribute.
- Add checking for maximum supported LIODN value.
- Use upper_32_bits and lower_32_bits macros while
  intializing PAMU data structures.
changes in v6:
- Simplified complex conditional statements.
- Fixed indentation issues.
- Added comments for IOMMU API implementation.
changes in v5:
- Addressed comments from Timur.
changes in v4:
- Addressed comments from Timur and Scott.
changes in v3:
- Addressed comments by Kumar Gala
- dynamic fspi allocation
- fixed alignment check in map and unmap
 drivers/iommu/Kconfig           |    8 +
 drivers/iommu/Makefile          |    1 +
 drivers/iommu/fsl_pamu.c        | 1260 +++++++++++++++++++++++++++++++++++++++
 drivers/iommu/fsl_pamu.h        |  398 ++++++++++++
 drivers/iommu/fsl_pamu_domain.c | 1135 +++++++++++++++++++++++++++++++++++
 drivers/iommu/fsl_pamu_domain.h |   89 +++
 6 files changed, 2891 insertions(+), 0 deletions(-)
 create mode 100644 drivers/iommu/fsl_pamu.c
 create mode 100644 drivers/iommu/fsl_pamu.h
 create mode 100644 drivers/iommu/fsl_pamu_domain.c
 create mode 100644 drivers/iommu/fsl_pamu_domain.h

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index 3f0b15a1..a7dedcb 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -17,6 +17,14 @@ config OF_IOMMU
        def_bool y
        depends on OF
 
+config FSL_PAMU
+	bool "Freescale IOMMU support"
+	depends on PPC_E500MC
+	select IOMMU_API
+	select GENERIC_ALLOCATOR
+	help
+	  Freescale PAMU support.
+
 # MSM IOMMU support
 config MSM_IOMMU
 	bool "MSM IOMMU Support"
diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index f66b816..4bc664e 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -13,3 +13,4 @@ obj-$(CONFIG_OMAP_IOMMU_DEBUG) += omap-iommu-debug.o
 obj-$(CONFIG_TEGRA_IOMMU_GART) += tegra-gart.o
 obj-$(CONFIG_TEGRA_IOMMU_SMMU) += tegra-smmu.o
 obj-$(CONFIG_EXYNOS_IOMMU) += exynos-iommu.o
+obj-$(CONFIG_FSL_PAMU) += fsl_pamu.o fsl_pamu_domain.o
diff --git a/drivers/iommu/fsl_pamu.c b/drivers/iommu/fsl_pamu.c
new file mode 100644
index 0000000..55f90d1
--- /dev/null
+++ b/drivers/iommu/fsl_pamu.c
@@ -0,0 +1,1260 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * Copyright (C) 2012 Freescale Semiconductor, Inc.
+ *
+ */
+
+#define pr_fmt(fmt)    "fsl-pamu: %s: " fmt, __func__
+
+#include <linux/init.h>
+#include <linux/iommu.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/of_platform.h>
+#include <linux/bootmem.h>
+#include <linux/genalloc.h>
+#include <asm/io.h>
+#include <asm/bitops.h>
+#include <asm/fsl_guts.h>
+
+#include "fsl_pamu.h"
+
+/* define indexes for each operation mapping scenario */
+#define OMI_QMAN        0x00
+#define OMI_FMAN        0x01
+#define OMI_QMAN_PRIV   0x02
+#define OMI_CAAM        0x03
+
+/* Handling access violations */
+#define make64(high, low) (((u64)(high) << 32) | (low))
+
+struct pamu_isr_data {
+	void __iomem *pamu_reg_base;	/* Base address of PAMU regs*/
+	unsigned int count;		/* The number of PAMUs */
+};
+
+static struct paace *ppaact;
+static struct paace *spaact;
+static struct ome *omt;
+
+/* maximum subwindows permitted per liodn */
+unsigned int max_subwindow_count;
+/* Number of SPAACT entries */
+unsigned long max_subwins;
+
+/* Pool for fspi allocation */
+struct gen_pool *spaace_pool;
+
+static unsigned long get_spaact_size(void)
+{
+	return max_subwins * sizeof(struct paace);
+}
+
+/** 
+ * pamu_get_ppaace() - Return the primary PACCE
+ * @liodn: liodn PAACT index for desired PAACE
+ *
+ * Returns the ppace pointer upon success else return
+ * null.
+ */
+static struct paace *pamu_get_ppaace(int liodn)
+{
+	if (!ppaact || liodn > PAACE_NUMBER_ENTRIES) {
+		pr_err("PPAACT doesn't exist\n");
+		return NULL;
+	}
+
+	return &ppaact[liodn];
+}
+
+/** 
+ * pamu_enable_liodn() - Set valid bit of PACCE
+ * @liodn: liodn PAACT index for desired PAACE
+ *
+ * Returns 0 upon success else error code < 0 returned
+ */
+int pamu_enable_liodn(int liodn)
+{
+	struct paace *ppaace;
+
+	ppaace = pamu_get_ppaace(liodn);
+	if (!ppaace) {
+		pr_err("Invalid primary paace entry\n");
+		return -ENOENT;
+	}
+
+	if (!get_bf(ppaace->addr_bitfields, PPAACE_AF_WSE)) {
+		pr_err("liodn %d not configured\n", liodn);
+		return -EINVAL;
+	}
+
+	/* Ensure that all other stores to the ppaace complete first */
+	mb();
+
+	ppaace->addr_bitfields |= PAACE_V_VALID;
+	mb();
+
+	return 0;
+}
+
+/** 
+ * pamu_disable_liodn() - Clears valid bit of PACCE
+ * @liodn: liodn PAACT index for desired PAACE
+ *
+ * Returns 0 upon success else error code < 0 returned
+ */
+int pamu_disable_liodn(int liodn)
+{
+	struct paace *ppaace;
+
+	ppaace = pamu_get_ppaace(liodn);
+	if (!ppaace) {
+		pr_err("Invalid primary paace entry\n");
+		return -ENOENT;
+	}
+
+	set_bf(ppaace->addr_bitfields, PAACE_AF_V, PAACE_V_INVALID);
+	mb();
+
+	return 0;
+}
+
+/* Derive the window size encoding for a particular PAACE entry */
+static unsigned int map_addrspace_size_to_wse(phys_addr_t addrspace_size)
+{
+	/* Bug if not a power of 2 */
+	BUG_ON((addrspace_size & (addrspace_size - 1)));
+
+	/* window size is 2^(WSE+1) bytes */
+	return __ffs(addrspace_size >> PAMU_PAGE_SHIFT) + PAMU_PAGE_SHIFT - 1;
+}
+
+/* Derive the PAACE window count encoding for the subwindow count */
+static unsigned int map_subwindow_cnt_to_wce(u32 subwindow_cnt)
+{
+       /* window count is 2^(WCE+1) bytes */
+       return __ffs(subwindow_cnt) - 1;
+}
+
+/* 
+ * Set the PAACE type as primary and set the coherency required domain
+ * attribute
+ */
+static void pamu_setup_default_xfer_to_host_ppaace(struct paace *ppaace)
+{
+	set_bf(ppaace->addr_bitfields, PAACE_AF_PT, PAACE_PT_PRIMARY);
+
+	set_bf(ppaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
+	       PAACE_M_COHERENCE_REQ);
+}
+
+/*
+ * Set the PAACE type as secondary and set the coherency required domain
+ * attribute.
+ */
+static void pamu_setup_default_xfer_to_host_spaace(struct paace *spaace)
+{
+	set_bf(spaace->addr_bitfields, PAACE_AF_PT, PAACE_PT_SECONDARY);
+	set_bf(spaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
+	       PAACE_M_COHERENCE_REQ);
+}
+
+/*
+ * Return the spaace (corresponding to the secondary window index)
+ * for a particular ppaace.
+ */
+static struct paace *pamu_get_spaace(struct paace *paace, u32 wnum)
+{
+	u32 subwin_cnt;
+	struct paace *spaace = NULL;
+
+	subwin_cnt = 1UL << (get_bf(paace->impl_attr, PAACE_IA_WCE) + 1);
+
+	if (wnum < subwin_cnt)
+		spaace = &spaact[paace->fspi + wnum];
+	else
+		pr_err("secondary paace out of bounds\n");
+
+	return spaace;
+}
+
+/**
+ * pamu_get_fspi_and_allocate() - Allocates fspi index and reserves subwindows
+ *                                required for primary PAACE in the secondary
+ *                                PAACE table.
+ * @subwin_cnt: Number of subwindows to be reserved.
+ *
+ * A PPAACE entry may have a number of associated subwindows. A subwindow
+ * corresponds to a SPAACE entry in the SPAACT table. Each PAACE entry stores
+ * the index (fspi) of the first SPAACE entry in the SPAACT table. This
+ * function returns the index of the first SPAACE entry. The remaining
+ * SPAACE entries are reserved contiguously from that index.
+ *
+ * Returns a valid fspi index in the range of 0 - max_subwins on success.
+ * If no SPAACE entry is available or the allocator can not reserve the required
+ * number of contiguous entries function returns ULONG_MAX indicating a failure.
+ *
+*/
+static unsigned long pamu_get_fspi_and_allocate(u32 subwin_cnt)
+{
+	unsigned long spaace_addr;
+
+	spaace_addr = gen_pool_alloc(spaace_pool, subwin_cnt * sizeof(struct paace));
+	if (!spaace_addr)
+		return ULONG_MAX;
+
+	return (spaace_addr - (unsigned long)spaact) / (sizeof(struct paace));
+}
+
+/* Release the subwindows reserved for a particular LIODN */
+void pamu_free_subwins(int liodn)
+{
+	struct paace *ppaace;
+	u32 subwin_cnt, size;
+
+	ppaace = pamu_get_ppaace(liodn);
+	if (!ppaace) {
+		pr_err("Invalid liodn entry\n");
+		return;
+	}
+
+	if (get_bf(ppaace->addr_bitfields, PPAACE_AF_MW)) {
+		subwin_cnt = 1UL << (get_bf(ppaace->impl_attr, PAACE_IA_WCE) + 1);
+		size = (subwin_cnt - 1) * sizeof(struct paace);
+		gen_pool_free(spaace_pool, (unsigned long)&spaact[ppaace->fspi], size);
+		set_bf(ppaace->addr_bitfields, PPAACE_AF_MW, 0);
+	}
+}
+
+/* 
+ * Function used for updating stash destination for the coressponding
+ * LIODN.
+ */
+int  pamu_update_paace_stash(int liodn, u32 subwin, u32 value)
+{
+	struct paace *paace;
+
+	paace = pamu_get_ppaace(liodn);
+	if (!paace) {
+		pr_err("Invalid liodn entry\n");
+		return -ENOENT;
+	}
+	if (subwin) {
+		paace = pamu_get_spaace(paace, subwin - 1);
+		if (!paace) {
+			return -ENOENT;
+		}
+	}
+	set_bf(paace->impl_attr, PAACE_IA_CID, value);
+
+	mb();
+
+	return 0;
+}
+
+/* Disable a subwindow corresponding to the LIODN */
+int pamu_disable_spaace(int liodn, u32 subwin)
+{
+	struct paace *paace;
+
+	paace = pamu_get_ppaace(liodn);
+	if (!paace) {
+		pr_err("Invalid liodn entry\n");
+		return -ENOENT;
+	}
+	if (subwin) {
+		paace = pamu_get_spaace(paace, subwin - 1);
+		if (!paace) {
+			return -ENOENT;
+		}
+		set_bf(paace->addr_bitfields, PAACE_AF_V,
+			 PAACE_V_INVALID);
+	} else {
+		set_bf(paace->addr_bitfields, PAACE_AF_AP,
+			 PAACE_AP_PERMS_DENIED);
+	}
+
+	mb();
+
+	return 0;
+}
+
+
+/** 
+ * pamu_config_paace() - Sets up PPAACE entry for specified liodn
+ *
+ * @liodn: Logical IO device number
+ * @win_addr: starting address of DSA window
+ * @win-size: size of DSA window
+ * @omi: Operation mapping index -- if ~omi == 0 then omi not defined
+ * @rpn: real (true physical) page number
+ * @stashid: cache stash id for associated cpu -- if ~stashid == 0 then
+ *	     stashid not defined
+ * @snoopid: snoop id for hardware coherency -- if ~snoopid == 0 then
+ *	     snoopid not defined
+ * @subwin_cnt: number of sub-windows
+ * @prot: window permissions
+ *
+ * Returns 0 upon success else error code < 0 returned
+ */
+int pamu_config_ppaace(int liodn, phys_addr_t win_addr, phys_addr_t win_size,
+		       u32 omi, unsigned long rpn, u32 snoopid, u32 stashid,
+		       u32 subwin_cnt, int prot)
+{
+	struct paace *ppaace;
+	unsigned long fspi;
+
+	if ((win_size & (win_size - 1)) || win_size < PAMU_PAGE_SIZE) {
+		pr_err("window size too small or not a power of two %llx\n", win_size);
+		return -EINVAL;
+	}
+
+	if (win_addr & (win_size - 1)) {
+		pr_err("window address is not aligned with window size\n");
+		return -EINVAL;
+	}
+
+	ppaace = pamu_get_ppaace(liodn);
+	if (!ppaace) {
+		return -ENOENT;
+	}
+
+	/* window size is 2^(WSE+1) bytes */
+	set_bf(ppaace->addr_bitfields, PPAACE_AF_WSE,
+           map_addrspace_size_to_wse(win_size));
+
+	pamu_setup_default_xfer_to_host_ppaace(ppaace);
+
+	ppaace->wbah = win_addr >> (PAMU_PAGE_SHIFT + 20);
+	set_bf(ppaace->addr_bitfields, PPAACE_AF_WBAL,
+	       (win_addr >> PAMU_PAGE_SHIFT));
+
+	/* set up operation mapping if it's configured */
+	if (omi < OME_NUMBER_ENTRIES) {
+		set_bf(ppaace->impl_attr, PAACE_IA_OTM, PAACE_OTM_INDEXED);
+		ppaace->op_encode.index_ot.omi = omi;
+	} else if (~omi != 0) {
+		pr_err("bad operation mapping index: %d\n", omi);
+		return -EINVAL;
+	}
+
+	/* configure stash id */
+	if (~stashid != 0)
+		set_bf(ppaace->impl_attr, PAACE_IA_CID, stashid);
+
+	/* configure snoop id */
+	if (~snoopid != 0)
+		ppaace->domain_attr.to_host.snpid = snoopid;
+
+	if (subwin_cnt) {
+		/* The first entry is in the primary PAACE instead */
+		fspi = pamu_get_fspi_and_allocate(subwin_cnt - 1);
+		if (fspi == ULONG_MAX) {
+			pr_err("spaace indexes exhausted\n");
+			return -EINVAL;
+		}
+
+		/* window count is 2^(WCE+1) bytes */
+		set_bf(ppaace->impl_attr, PAACE_IA_WCE,
+		       map_subwindow_cnt_to_wce(subwin_cnt));
+		set_bf(ppaace->addr_bitfields, PPAACE_AF_MW, 0x1);
+		ppaace->fspi = fspi;
+	} else {
+		set_bf(ppaace->impl_attr, PAACE_IA_ATM, PAACE_ATM_WINDOW_XLATE);
+		ppaace->twbah = rpn >> 20;
+		set_bf(ppaace->win_bitfields, PAACE_WIN_TWBAL, rpn);
+		set_bf(ppaace->addr_bitfields, PAACE_AF_AP, prot);
+		set_bf(ppaace->impl_attr, PAACE_IA_WCE, 0);
+		set_bf(ppaace->addr_bitfields, PPAACE_AF_MW, 0);
+	}
+	mb();
+
+	return 0;
+}
+
+/**
+ * pamu_config_spaace() - Sets up SPAACE entry for specified subwindow
+ *
+ * @liodn:  Logical IO device number
+ * @subwin_cnt:  number of sub-windows associated with dma-window
+ * @subwin_addr: starting address of subwindow
+ * @subwin_size: size of subwindow
+ * @omi: Operation mapping index
+ * @rpn: real (true physical) page number
+ * @snoopid: snoop id for hardware coherency -- if ~snoopid == 0 then
+ *			  snoopid not defined
+ * @stashid: cache stash id for associated cpu
+ * @enable: enable/disable subwindow after reconfiguration
+ * @prot: sub window permissions
+ *
+ * Returns 0 upon success else error code < 0 returned
+ */
+int pamu_config_spaace(int liodn, u32 subwin_cnt, u32 subwin_addr,
+		       phys_addr_t subwin_size, u32 omi, unsigned long rpn,
+		       u32 snoopid, u32 stashid, int enable, int prot)
+{
+	struct paace *paace;
+
+	/* setup sub-windows */
+	if (!subwin_cnt) {
+		pr_err("Invalid subwindow count\n");
+		return -EINVAL;
+	}
+
+	paace = pamu_get_ppaace(liodn);
+	if (subwin_addr > 0 && subwin_addr < subwin_cnt && paace) {
+		paace = pamu_get_spaace(paace, subwin_addr - 1);
+
+		if (paace && !(paace->addr_bitfields & PAACE_V_VALID)) {
+			pamu_setup_default_xfer_to_host_spaace(paace);
+			set_bf(paace->addr_bitfields, SPAACE_AF_LIODN, liodn);
+		}
+	}
+
+	if (!paace) {
+		pr_err("Invalid liodn entry\n");
+		return -ENOENT;
+	}
+
+	if (!enable && prot == PAACE_AP_PERMS_DENIED) {
+		if (subwin_addr > 0)
+			set_bf(paace->addr_bitfields, PAACE_AF_V,
+				 PAACE_V_INVALID);
+		else
+			set_bf(paace->addr_bitfields, PAACE_AF_AP,
+				 prot);
+		mb();
+		return 0;
+	}
+
+	if (subwin_size & (subwin_size - 1) || subwin_size < PAMU_PAGE_SIZE) {
+		pr_err("subwindow size out of range, or not a power of 2\n");
+		return -EINVAL;
+	}
+
+	if (rpn == ULONG_MAX) {
+		pr_err("real page number out of range\n");
+		return -EINVAL;
+	}
+
+	/* window size is 2^(WSE+1) bytes */
+	set_bf(paace->win_bitfields, PAACE_WIN_SWSE,
+	       map_addrspace_size_to_wse(subwin_size));
+
+	set_bf(paace->impl_attr, PAACE_IA_ATM, PAACE_ATM_WINDOW_XLATE);
+	paace->twbah = rpn >> 20;
+	set_bf(paace->win_bitfields, PAACE_WIN_TWBAL, rpn);
+	set_bf(paace->addr_bitfields, PAACE_AF_AP, prot);
+
+	/* configure snoop id */
+	if (~snoopid != 0)
+		paace->domain_attr.to_host.snpid = snoopid;
+
+	/* set up operation mapping if it's configured */
+	if (omi < OME_NUMBER_ENTRIES) {
+		set_bf(paace->impl_attr, PAACE_IA_OTM, PAACE_OTM_INDEXED);
+		paace->op_encode.index_ot.omi = omi;
+	} else if (~omi != 0) {
+		pr_err("bad operation mapping index: %d\n", omi);
+		return -EINVAL;
+	}
+
+	if (~stashid != 0)
+		set_bf(paace->impl_attr, PAACE_IA_CID, stashid);
+
+	smp_wmb();
+
+	if (enable)
+		paace->addr_bitfields |= PAACE_V_VALID;
+
+	mb();
+
+	return 0;
+}
+
+/**
+* get_ome_index() - Returns the index in the operation mapping table
+*                   for device.
+* @*omi_index: pointer for storing the index value
+*
+*/
+void get_ome_index(u32 *omi_index, struct device *dev)
+{
+	if (of_device_is_compatible(dev->of_node, "fsl,qman-portal"))
+		*omi_index = OMI_QMAN;
+	if (of_device_is_compatible(dev->of_node, "fsl,qman"))
+		*omi_index = OMI_QMAN_PRIV;
+}
+
+/**
+ * get_stash_id - Returns stash destination id corresponding to a
+ *                cache type and vcpu.
+ * @stash_dest_hint: L1, L2 or L3
+ * @vcpu: vpcu target for a particular cache type.  
+ *
+ * Returs stash on success or ~(u32)0 on failure.
+ *
+ */
+u32 get_stash_id(u32 stash_dest_hint, u32 vcpu)
+{
+	const u32 *prop;
+	struct device_node *node;
+	u32 cache_level;
+	int len;
+
+	/* Fastpath, exit early if L3/CPC cache is target for stashing */
+	if (stash_dest_hint == IOMMU_ATTR_CACHE_L3) {
+		node = of_find_compatible_node(NULL, NULL,
+				"fsl,p4080-l3-cache-controller");
+		if (node) {
+			prop = of_get_property(node, "cache-stash-id", 0);
+			if (!prop) {
+				pr_err("missing cache-stash-id at %s\n", node->full_name);
+				of_node_put(node);
+				return ~(u32)0;
+			}
+			of_node_put(node);
+			return be32_to_cpup(prop);
+		}
+		return ~(u32)0;
+	}
+
+	for_each_node_by_type(node, "cpu") {
+		prop = of_get_property(node, "reg", &len);
+		if (be32_to_cpup(prop) == vcpu)
+			break;
+	}
+
+	/* find the hwnode that represents the cache */
+	for (cache_level = IOMMU_ATTR_CACHE_L1; cache_level < IOMMU_ATTR_CACHE_L3; cache_level++) {
+		if (stash_dest_hint == cache_level) {
+			prop = of_get_property(node, "cache-stash-id", 0);
+			if (!prop) {
+				pr_err("missing cache-stash-id at %s\n", node->full_name);
+				of_node_put(node);
+				return ~(u32)0;
+			}
+			of_node_put(node);
+			return be32_to_cpup(prop);
+		}
+
+		prop = of_get_property(node, "next-level-cache", 0);
+		if (!prop) {
+			pr_err("can't find next-level-cache at %s\n",
+			          node->full_name);
+			of_node_put(node);
+			return ~(u32)0;  /* can't traverse any further */
+		}
+		of_node_put(node);
+
+		/* advance to next node in cache hierarchy */
+		node = of_find_node_by_phandle(*prop);
+		if (!node) {
+			pr_err("Invalid node for cache hierarchy %s\n",
+				node->full_name);
+			return ~(u32)0;
+		}
+	}
+
+	pr_err("stash dest not found for %d on vcpu %d\n",
+	          stash_dest_hint, vcpu);
+	return ~(u32)0;
+}
+
+/* Identify if the PAACT table entry belongs to QMAN, BMAN or QMAN Portal */
+#define QMAN_PAACE 1
+#define QMAN_PORTAL_PAACE 2
+#define BMAN_PAACE 3
+
+/**
+ * Setup operation mapping and stash destinations for QMAN and QMAN portal.
+ * Memory accesses to QMAN and BMAN private memory need not be coherent, so
+ * clear the PAACE entry coherency attribute for them.
+ */
+static void setup_qbman_paace(struct paace *ppaace, int  paace_type)
+{
+	switch(paace_type) {
+		case QMAN_PAACE:
+			set_bf(ppaace->impl_attr, PAACE_IA_OTM, PAACE_OTM_INDEXED);
+			ppaace->op_encode.index_ot.omi = OMI_QMAN_PRIV;
+			/* setup QMAN Private data stashing for the L3 cache */
+			set_bf(ppaace->impl_attr, PAACE_IA_CID, get_stash_id(IOMMU_ATTR_CACHE_L3, 0));
+			set_bf(ppaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
+			       0);
+			break;
+		case QMAN_PORTAL_PAACE:
+			set_bf(ppaace->impl_attr, PAACE_IA_OTM, PAACE_OTM_INDEXED);
+			ppaace->op_encode.index_ot.omi = OMI_QMAN;
+			/*Set DQRR and Frame stashing for the L3 cache */
+			set_bf(ppaace->impl_attr, PAACE_IA_CID, get_stash_id(IOMMU_ATTR_CACHE_L3, 0));
+			break;
+		case BMAN_PAACE:
+			set_bf(ppaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
+			       0);
+			break;
+	}
+}
+
+/**
+ * Setup the operation mapping table for various devices. This is a static
+ * table where each table index corresponds to a particular device. PAMU uses
+ * this table to translate device transaction to appropriate corenet
+ * transaction.
+ */
+static void __init setup_omt(struct ome *omt)
+{
+	struct ome *ome;
+
+	/* Configure OMI_QMAN */
+	ome = &omt[OMI_QMAN];
+
+	ome->moe[IOE_READ_IDX] = EOE_VALID | EOE_READ;
+	ome->moe[IOE_EREAD0_IDX] = EOE_VALID | EOE_RSA;
+	ome->moe[IOE_WRITE_IDX] = EOE_VALID | EOE_WRITE;
+	ome->moe[IOE_EWRITE0_IDX] = EOE_VALID | EOE_WWSAO;
+
+	ome->moe[IOE_DIRECT0_IDX] = EOE_VALID | EOE_LDEC;
+	ome->moe[IOE_DIRECT1_IDX] = EOE_VALID | EOE_LDECPE;
+
+	/* Configure OMI_FMAN */
+	ome = &omt[OMI_FMAN];
+	ome->moe[IOE_READ_IDX]  = EOE_VALID | EOE_READI;
+	ome->moe[IOE_WRITE_IDX] = EOE_VALID | EOE_WRITE;
+
+	/* Configure OMI_QMAN private */
+	ome = &omt[OMI_QMAN_PRIV];
+	ome->moe[IOE_READ_IDX]  = EOE_VALID | EOE_READ;
+	ome->moe[IOE_WRITE_IDX] = EOE_VALID | EOE_WRITE;
+	ome->moe[IOE_EREAD0_IDX] = EOE_VALID | EOE_RSA;
+	ome->moe[IOE_EWRITE0_IDX] = EOE_VALID | EOE_WWSA;
+
+	/* Configure OMI_CAAM */
+	ome = &omt[OMI_CAAM];
+	ome->moe[IOE_READ_IDX]  = EOE_VALID | EOE_READI;
+	ome->moe[IOE_WRITE_IDX] = EOE_VALID | EOE_WRITE;
+}
+
+/*
+ * Get the maximum number of PAACT table entries
+ * and subwindows supported by PAMU
+ */
+static void get_pamu_cap_values(unsigned long pamu_reg_base)
+{
+	u32 pc_val;
+
+	pc_val = in_be32((u32 *)(pamu_reg_base + PAMU_PC3));
+	/* Maximum number of subwindows per liodn */
+	max_subwindow_count = 1 << (1 + PAMU_PC3_MWCE(pc_val));
+	/* Total number of SPACCT entries */
+	max_subwins = PAACE_NUMBER_ENTRIES * max_subwindow_count;
+}
+
+/* Setup PAMU registers pointing to PAACT, SPAACT and OMT */
+int setup_one_pamu(unsigned long pamu_reg_base, unsigned long pamu_reg_size,
+	           phys_addr_t ppaact_phys, phys_addr_t spaact_phys,
+		   phys_addr_t omt_phys)
+{
+	u32 *pc;
+	struct pamu_mmap_regs *pamu_regs;
+
+	pc = (u32 *) (pamu_reg_base + PAMU_PC);
+	pamu_regs = (struct pamu_mmap_regs *)
+		(pamu_reg_base + PAMU_MMAP_REGS_BASE);
+
+	/* set up pointers to corenet control blocks */
+
+	out_be32(&pamu_regs->ppbah, upper_32_bits(ppaact_phys));
+	out_be32(&pamu_regs->ppbal, lower_32_bits(ppaact_phys));
+	ppaact_phys = ppaact_phys + PAACT_SIZE;
+	out_be32(&pamu_regs->pplah, upper_32_bits(ppaact_phys));
+	out_be32(&pamu_regs->pplal, lower_32_bits(ppaact_phys));
+
+	out_be32(&pamu_regs->spbah, upper_32_bits(spaact_phys));
+	out_be32(&pamu_regs->spbal, lower_32_bits(spaact_phys));
+	spaact_phys = spaact_phys + get_spaact_size();
+	out_be32(&pamu_regs->splah, upper_32_bits(spaact_phys));
+	out_be32(&pamu_regs->splal, lower_32_bits(spaact_phys));
+
+	out_be32(&pamu_regs->obah, upper_32_bits(omt_phys));
+	out_be32(&pamu_regs->obal, lower_32_bits(omt_phys));
+	omt_phys = omt_phys + OMT_SIZE;
+	out_be32(&pamu_regs->olah, upper_32_bits(omt_phys));
+	out_be32(&pamu_regs->olal, lower_32_bits(omt_phys));
+
+	/*
+	 * set PAMU enable bit,
+	 * allow ppaact & omt to be cached
+	 * & enable PAMU access violation interrupts.
+	 */
+
+	out_be32((u32 *)(pamu_reg_base + PAMU_PICS),
+			PAMU_ACCESS_VIOLATION_ENABLE);
+	out_be32(pc, PAMU_PC_PE | PAMU_PC_OCE | PAMU_PC_SPCC | PAMU_PC_PPCC);
+	return 0;
+}
+
+/* Enable all device LIODNS */
+static void __init setup_liodns(void)
+{
+	int i, len;
+	struct paace *ppaace;
+	struct device_node *node = NULL;
+	const u32 *prop;
+
+	for_each_node_with_property(node, "fsl,liodn") {
+		prop = of_get_property(node, "fsl,liodn", &len);
+		for (i = 0; i < len / sizeof(u32); i++) {
+			int liodn;
+
+			liodn = be32_to_cpup(&prop[i]);
+			if (liodn > PAACE_NUMBER_ENTRIES) {
+				pr_err("Invalid LIODN value %d\n", liodn);
+				continue;
+			}
+			ppaace = pamu_get_ppaace(liodn);
+			pamu_setup_default_xfer_to_host_ppaace(ppaace);
+			/* window size is 2^(WSE+1) bytes */
+			set_bf(ppaace->addr_bitfields, PPAACE_AF_WSE, 35);
+			ppaace->wbah = 0;
+			set_bf(ppaace->addr_bitfields, PPAACE_AF_WBAL, 0);
+			set_bf(ppaace->impl_attr, PAACE_IA_ATM,
+				PAACE_ATM_NO_XLATE);
+			set_bf(ppaace->addr_bitfields, PAACE_AF_AP, 
+				PAACE_AP_PERMS_ALL);
+			if (of_device_is_compatible(node, "fsl,qman-portal"))
+				setup_qbman_paace(ppaace, QMAN_PORTAL_PAACE);
+			if (of_device_is_compatible(node, "fsl,qman"))
+				setup_qbman_paace(ppaace, QMAN_PAACE);
+			if (of_device_is_compatible(node, "fsl,bman"))
+				setup_qbman_paace(ppaace, BMAN_PAACE);
+			mb();
+			pamu_enable_liodn(liodn);
+		}
+	}
+}
+
+/* TBD: PAMU access violation interrupt handler */
+irqreturn_t pamu_av_isr(int irq, void *arg)
+{
+	struct pamu_isr_data *data = arg;
+	phys_addr_t phys;
+	unsigned int i, j;
+
+	pr_emerg("fsl-pamu: access violation interrupt\n");
+
+	for (i = 0; i < data->count; i++) {
+		void __iomem *p = data->pamu_reg_base + i * PAMU_OFFSET;
+		u32 pics = in_be32(p + PAMU_PICS);
+
+		if (pics & PAMU_ACCESS_VIOLATION_STAT) {
+			pr_emerg("POES1=%08x\n", in_be32(p + PAMU_POES1));
+			pr_emerg("POES2=%08x\n", in_be32(p + PAMU_POES2));
+			pr_emerg("AVS1=%08x\n", in_be32(p + PAMU_AVS1));
+			pr_emerg("AVS2=%08x\n", in_be32(p + PAMU_AVS2));
+			pr_emerg("AVA=%016llx\n", make64(in_be32(p + PAMU_AVAH),
+				in_be32(p + PAMU_AVAL)));
+			pr_emerg("UDAD=%08x\n", in_be32(p + PAMU_UDAD));
+			pr_emerg("POEA=%016llx\n", make64(in_be32(p + PAMU_POEAH),
+				in_be32(p + PAMU_POEAL)));
+
+			phys = make64(in_be32(p + PAMU_POEAH),
+				in_be32(p + PAMU_POEAL));
+
+			/* Assume that POEA points to a PAACE */
+			if (phys) {
+				u32 *paace = phys_to_virt(phys);
+
+				/* Only the first four words are relevant */
+				for (j = 0; j < 4; j++)
+					pr_emerg("PAACE[%u]=%08x\n", j, in_be32(paace + j));
+			}
+		}
+	}
+
+	panic("\n");
+	/* NOTREACHED */
+
+	return IRQ_HANDLED;
+}
+
+#define LAWAR_EN		0x80000000
+#define LAWAR_TARGET_MASK	0x0FF00000
+#define LAWAR_TARGET_SHIFT	20
+#define LAWAR_SIZE_MASK		0x0000003F
+#define LAWAR_CSDID_MASK	0x000FF000
+#define LAWAR_CSDID_SHIFT	12
+
+#define LAW_SIZE_4K		0xb
+
+struct ccsr_law {
+	u32	lawbarh;	/* LAWn base address high */
+	u32	lawbarl;	/* LAWn base address low */
+	u32	lawar;		/* LAWn attributes */
+	u32	reserved;
+};
+
+#define make64(high, low) (((u64)(high) << 32) | (low))
+
+/*
+ * Create a coherence subdomain for a given memory block.
+ */
+static int __init create_csd(phys_addr_t phys, size_t size, u32 csd_port_id)
+{
+	struct device_node *np;
+	const __be32 *iprop;
+	void __iomem *lac = NULL;	/* Local Access Control registers */
+	struct ccsr_law __iomem *law;
+	void __iomem *ccm = NULL;
+	u32 __iomem *csdids;
+	unsigned int i, num_laws, num_csds;
+	u32 law_target = 0;
+	u32 csd_id = 0;
+	int ret = 0;
+
+	np = of_find_compatible_node(NULL, NULL, "fsl,corenet-law");
+	if (!np)
+		return -ENODEV;
+
+	iprop = of_get_property(np, "fsl,num-laws", NULL);
+	if (!iprop) {
+		ret = -ENODEV;
+		goto error;
+	}
+
+	num_laws = be32_to_cpup(iprop);
+	if (!num_laws) {
+		ret = -ENODEV;
+		goto error;
+	}
+
+	lac = of_iomap(np, 0);
+	if (!lac) {
+		ret = -ENODEV;
+		goto error;
+	}
+
+	/* LAW registers are at offset 0xC00 */
+	law = lac + 0xC00;
+
+	of_node_put(np);
+
+	np = of_find_compatible_node(NULL, NULL, "fsl,corenet-cf");
+	if (!np) {
+		ret = -ENODEV;
+		goto error;
+	}
+
+	iprop = of_get_property(np, "fsl,ccf-num-csdids", NULL);
+	if (!iprop) {
+		ret = -ENODEV;
+		goto error;
+	}
+
+	num_csds = be32_to_cpup(iprop);
+	if (!num_csds) {
+		ret = -ENODEV;
+		goto error;
+	}
+
+	ccm = of_iomap(np, 0);
+	if (!ccm) {
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	/* The undocumented CSDID registers are at offset 0x600 */
+	csdids = ccm + 0x600;
+
+	of_node_put(np);
+	np = NULL;
+
+	/* Find an unused coherence subdomain ID */
+	for (csd_id = 0; csd_id < num_csds; csd_id++) {
+		if (!csdids[csd_id])
+			break;
+	}
+
+	/* Store the Port ID in the (undocumented) proper CIDMRxx register */
+	csdids[csd_id] = csd_port_id;
+
+	/* Find the DDR LAW that maps to our buffer. */
+	for (i = 0; i < num_laws; i++) {
+		if (law[i].lawar & LAWAR_EN) {
+			phys_addr_t law_start, law_end;
+
+			law_start = make64(law[i].lawbarh, law[i].lawbarl);
+			law_end = law_start +
+				(2ULL << (law[i].lawar & LAWAR_SIZE_MASK));
+
+			if (law_start <= phys && phys < law_end) {
+				law_target = law[i].lawar & LAWAR_TARGET_MASK;
+				break;
+			}
+		}
+	}
+
+	if (i == 0 || i == num_laws) {
+		/* This should never happen*/
+		ret = -ENOENT;
+		goto error;
+	}
+
+	/* Find a free LAW entry */
+	while (law[--i].lawar & LAWAR_EN) {
+		if (i == 0) {
+			/* No higher priority LAW slots available */
+			ret = -ENOENT;
+			goto error;
+		}
+	}
+
+	law[i].lawbarh = upper_32_bits(phys);
+	law[i].lawbarl = lower_32_bits(phys);
+	wmb();
+	law[i].lawar = LAWAR_EN | law_target | (csd_id << LAWAR_CSDID_SHIFT) |
+		(LAW_SIZE_4K + get_order(size));
+	wmb();
+
+error:
+	if (ccm)
+		iounmap(ccm);
+
+	if (lac)
+		iounmap(lac);
+
+	if (np)
+		of_node_put(np);
+
+	return ret;
+}
+
+/*
+ * Table of SVRs and the corresponding PORT_ID values.
+ *
+ * All future CoreNet-enabled SOCs will have this erratum fixed, so this table
+ * should never need to be updated.  SVRs are guaranteed to be unique, so
+ * there is no worry that a future SOC will inadvertently have one of these
+ * values.
+ */
+static const struct {
+	u32 svr;
+	u32 port_id;
+} port_id_map[] = {
+	{0x82100010, 0xFF000000},	/* P2040 1.0 */
+	{0x82100011, 0xFF000000},	/* P2040 1.1 */
+	{0x82100110, 0xFF000000},	/* P2041 1.0 */
+	{0x82100111, 0xFF000000},	/* P2041 1.1 */
+	{0x82110310, 0xFF000000},	/* P3041 1.0 */
+	{0x82110311, 0xFF000000},	/* P3041 1.1 */
+	{0x82010020, 0xFFF80000},	/* P4040 2.0 */
+	{0x82000020, 0xFFF80000},	/* P4080 2.0 */
+	{0x82210010, 0xFC000000},       /* P5010 1.0 */
+	{0x82210020, 0xFC000000},       /* P5010 2.0 */
+	{0x82200010, 0xFC000000},	/* P5020 1.0 */
+	{0x82050010, 0xFF800000},	/* P5021 1.0 */
+	{0x82040010, 0xFF800000},	/* P5040 1.0 */
+};
+
+#define SVR_SECURITY	0x80000	/* The Security (E) bit */
+
+static int __init fsl_pamu_probe(struct platform_device *pdev)
+{
+	void __iomem *pamu_regs = NULL;
+	struct ccsr_guts __iomem *guts_regs = NULL;
+	u32 pamubypenr, pamu_counter;
+	unsigned long pamu_reg_off;
+	unsigned long pamu_reg_base;
+	struct pamu_isr_data *data;
+	struct device_node *guts_node;
+	u64 size;
+	struct page *p;
+	int ret = 0;
+	int irq;
+	phys_addr_t ppaact_phys;
+	phys_addr_t spaact_phys;
+	phys_addr_t omt_phys;
+	size_t mem_size = 0;
+	unsigned int order = 0;
+	u32 csd_port_id = 0;
+	unsigned i;
+	/*
+	 * enumerate all PAMUs and allocate and setup PAMU tables
+	 * for each of them,
+	 * NOTE : All PAMUs share the same LIODN tables.
+	 */
+
+	pamu_regs = of_iomap(pdev->dev.of_node, 0);
+	if (!pamu_regs) {
+		dev_err(&pdev->dev, "ioremap of PAMU node failed\n");
+		return -ENOMEM;
+	}
+	of_get_address(pdev->dev.of_node, 0, &size, NULL);
+
+	irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
+	if (irq == NO_IRQ) {
+		dev_warn(&pdev->dev, "no interrupts listed in PAMU node\n");
+		goto error;
+	}
+
+	data = kzalloc(sizeof(struct pamu_isr_data), GFP_KERNEL);
+	if (!data) {
+		iounmap(pamu_regs);
+		return -ENOMEM;
+	}
+	data->pamu_reg_base = pamu_regs;
+	data->count = size / PAMU_OFFSET;
+
+	/* The ISR needs access to the regs, so we won't iounmap them */
+	ret = request_irq(irq, pamu_av_isr, 0, "pamu", data);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "error %i installing ISR for irq %i\n",
+			ret, irq);
+		goto error;
+	}
+
+	guts_node = of_find_compatible_node(NULL, NULL,
+			"fsl,qoriq-device-config-1.0");
+	if (!guts_node) {
+		dev_err(&pdev->dev, "could not find GUTS node %s\n",
+			pdev->dev.of_node->full_name);
+		ret = -ENODEV;
+		goto error;
+	}
+
+	guts_regs = of_iomap(guts_node, 0);
+	of_node_put(guts_node);
+	if (!guts_regs) {
+		dev_err(&pdev->dev, "ioremap of GUTS node failed\n");
+		ret = -ENODEV;
+		goto error;
+	}
+
+	/* read in the PAMU capability registers */
+	get_pamu_cap_values((unsigned long)pamu_regs);
+	/*
+	 * To simplify the allocation of a coherency domain, we allocate the
+	 * PAACT and the OMT in the same memory buffer.  Unfortunately, this
+	 * wastes more memory compared to allocating the buffers separately.
+	 */
+	/* Determine how much memory we need */
+	mem_size = (PAGE_SIZE << get_order(PAACT_SIZE)) +
+		(PAGE_SIZE << get_order(get_spaact_size())) +
+		(PAGE_SIZE << get_order(OMT_SIZE));
+	order = get_order(mem_size);
+
+	p = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
+	if (!p) {
+		dev_err(&pdev->dev, "unable to allocate PAACT/SPAACT/OMT block\n");
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	ppaact = page_address(p);
+	ppaact_phys = page_to_phys(p);
+
+	/* Make sure the memory is naturally aligned */
+	if (ppaact_phys & ((PAGE_SIZE << order) - 1)) {
+		dev_err(&pdev->dev, "PAACT/OMT block is unaligned\n");
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	spaact = (void *)ppaact + (PAGE_SIZE << get_order(PAACT_SIZE));
+	omt = (void *)spaact + (PAGE_SIZE << get_order(get_spaact_size()));
+
+	dev_dbg(&pdev->dev, "ppaact virt=%p phys=0x%llx\n", ppaact,
+		(unsigned long long) ppaact_phys);
+
+	/* Check to see if we need to implement the work-around on this SOC */
+
+	/* Determine the Port ID for our coherence subdomain */
+	for (i = 0; i < ARRAY_SIZE(port_id_map); i++) {
+		if (port_id_map[i].svr == (mfspr(SPRN_SVR) & ~SVR_SECURITY)) {
+			csd_port_id = port_id_map[i].port_id;
+			dev_dbg(&pdev->dev, "found matching SVR %08x\n",
+				port_id_map[i].svr);
+			break;
+		}
+	}
+
+	if (csd_port_id) {
+		dev_dbg(&pdev->dev, "creating coherency subdomain at address "
+			"0x%llx, size %zu, port id 0x%08x", ppaact_phys,
+			mem_size, csd_port_id);
+
+		ret = create_csd(ppaact_phys, mem_size, csd_port_id);
+		if (ret) {
+			dev_err(&pdev->dev, "could not create coherence "
+				"subdomain\n");
+			return ret;
+		}
+	}
+
+	spaact_phys = virt_to_phys(spaact);
+	omt_phys = virt_to_phys(omt);
+
+	spaace_pool = gen_pool_create(ilog2(sizeof(struct paace)), -1);
+	if (!spaace_pool) {
+		ret = -ENOMEM;
+		dev_err(&pdev->dev, "PAMU : failed to allocate spaace gen pool\n");
+		goto error;
+	}
+
+	ret = gen_pool_add(spaace_pool, (unsigned long)spaact, get_spaact_size(), -1);
+	if (ret)
+		goto error_genpool;
+
+	pamubypenr = in_be32(&guts_regs->pamubypenr);
+
+	for (pamu_reg_off = 0, pamu_counter = 0x80000000; pamu_reg_off < size;
+	     pamu_reg_off += PAMU_OFFSET, pamu_counter >>= 1) {
+
+		pamu_reg_base = (unsigned long) pamu_regs + pamu_reg_off;
+		setup_one_pamu(pamu_reg_base, pamu_reg_off, ppaact_phys,
+				 spaact_phys, omt_phys);
+		/* Disable PAMU bypass for this PAMU */
+		pamubypenr &= ~pamu_counter;
+	}
+
+	setup_omt(omt);
+
+	/* Enable all relevant PAMU(s) */
+	out_be32(&guts_regs->pamubypenr, pamubypenr);
+
+	iounmap(guts_regs);
+
+	/* Enable DMA for the LIODNs in the device tree*/
+
+	setup_liodns();
+
+	return 0;
+
+error_genpool:
+	gen_pool_destroy(spaace_pool);
+
+error:
+	if (irq != NO_IRQ)
+		free_irq(irq, 0);
+
+	if (pamu_regs)
+		iounmap(pamu_regs);
+
+	if (guts_regs)
+		iounmap(guts_regs);
+
+	if (ppaact)
+		free_pages((unsigned long)ppaact, order);
+
+	ppaact = NULL;
+
+	return ret;
+}
+
+static const struct of_device_id fsl_of_pamu_ids[] = {
+	{
+		.compatible = "fsl,p4080-pamu",
+	},
+	{
+		.compatible = "fsl,pamu",
+	},
+	{},
+};
+
+static struct platform_driver fsl_of_pamu_driver = {
+	.driver = {
+		.name = "fsl-of-pamu",
+		.owner = THIS_MODULE,
+	},
+	.probe = fsl_pamu_probe,
+};
+
+static __init int fsl_pamu_init(void)
+{
+	struct platform_device *pdev = NULL;
+	struct device_node *np;
+	int ret;
+
+	/*
+	 * The normal OF process calls the probe function at some
+	 * indeterminate later time, after most drivers have loaded.  This is
+	 * too late for us, because PAMU clients (like the Qman driver)
+	 * depend on PAMU being initialized early.
+	 *
+	 * So instead, we "manually" call our probe function by creating the
+	 * platform devices ourselves.
+	 */
+
+	/*
+	 * We assume that there is only one PAMU node in the device tree.  A
+	 * single PAMU node represents all of the PAMU devices in the SOC
+	 * already.   Everything else already makes that assumption, and the
+	 * binding for the PAMU nodes doesn't allow for any parent-child
+	 * relationships anyway.  In other words, support for more than one
+	 * PAMU node would require significant changes to a lot of code.
+	 */
+
+	np = of_find_compatible_node(NULL, NULL, "fsl,pamu");
+	if (!np) {
+		pr_err("fsl-pamu: could not find a PAMU node\n");
+		return -ENODEV;
+	}
+
+	ret = platform_driver_register(&fsl_of_pamu_driver);
+	if (ret) {
+		pr_err("fsl-pamu: could not register driver (err=%i)\n", ret);
+		goto error_driver_register;
+	}
+
+	pdev = platform_device_alloc("fsl-of-pamu", 0);
+	if (!pdev) {
+		pr_err("fsl-pamu: could not allocate device %s\n",
+		       np->full_name);
+		ret = -ENOMEM;
+		goto error_device_alloc;
+	}
+	pdev->dev.of_node = of_node_get(np);
+
+	ret = pamu_domain_init();
+	if (ret)
+		goto error_device_add;
+
+	ret = platform_device_add(pdev);
+	if (ret) {
+		pr_err("fsl-pamu: could not add device %s (err=%i)\n",
+		       np->full_name, ret);
+		goto error_device_add;
+	}
+
+	return 0;
+
+error_device_add:
+	of_node_put(pdev->dev.of_node);
+	pdev->dev.of_node = NULL;
+
+	platform_device_put(pdev);
+
+error_device_alloc:
+	platform_driver_unregister(&fsl_of_pamu_driver);
+
+error_driver_register:
+	of_node_put(np);
+
+	return ret;
+}
+subsys_initcall(fsl_pamu_init);
diff --git a/drivers/iommu/fsl_pamu.h b/drivers/iommu/fsl_pamu.h
new file mode 100644
index 0000000..c54bc62
--- /dev/null
+++ b/drivers/iommu/fsl_pamu.h
@@ -0,0 +1,398 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * Copyright (C) 2012 Freescale Semiconductor, Inc.
+ *
+ */
+
+#ifndef __FSL_PAMU_H
+#define __FSL_PAMU_H
+
+/* Bit Field macros
+ * 	v = bit field variable; m = mask, m##_SHIFT = shift, x = value to load
+ */
+#define set_bf(v, m, x)		(v = ((v) & ~(m)) | (((x) << (m##_SHIFT)) & (m)))
+#define get_bf(v, m)		(((v) & (m)) >> (m##_SHIFT))
+
+/* PAMU CCSR space */
+#define PAMU_PGC 0x00000000     /* Allows all peripheral accesses */
+#define PAMU_PE 0x40000000      /* enable PAMU                    */
+
+/* PAMU_OFFSET to the next pamu space in ccsr */
+#define PAMU_OFFSET 0x1000
+
+#define PAMU_MMAP_REGS_BASE 0
+
+struct pamu_mmap_regs {
+	u32 ppbah;
+	u32 ppbal;
+	u32 pplah;
+	u32 pplal;
+	u32 spbah;
+	u32 spbal;
+	u32 splah;
+	u32 splal;
+	u32 obah;
+	u32 obal;
+	u32 olah;
+	u32 olal;
+};
+
+/* PAMU Error Registers */
+#define PAMU_POES1 0x0040
+#define PAMU_POES2 0x0044
+#define PAMU_POEAH 0x0048
+#define PAMU_POEAL 0x004C
+#define PAMU_AVS1  0x0050
+#define PAMU_AVS1_AV    0x1
+#define PAMU_AVS1_OTV   0x6
+#define PAMU_AVS1_APV   0x78
+#define PAMU_AVS1_WAV   0x380
+#define PAMU_AVS1_LAV   0x1c00
+#define PAMU_AVS1_GCV   0x2000
+#define PAMU_AVS1_PDV   0x4000
+#define PAMU_AV_MASK    (PAMU_AVS1_AV | PAMU_AVS1_OTV | PAMU_AVS1_APV | PAMU_AVS1_WAV \
+			| PAMU_AVS1_LAV | PAMU_AVS1_GCV | PAMU_AVS1_PDV)
+#define PAMU_AVS1_LIODN_SHIFT 16
+#define PAMU_LAV_LIODN_NOT_IN_PPAACT 0x400
+
+#define PAMU_AVS2  0x0054
+#define PAMU_AVAH  0x0058
+#define PAMU_AVAL  0x005C
+#define PAMU_EECTL 0x0060
+#define PAMU_EEDIS 0x0064
+#define PAMU_EEINTEN 0x0068
+#define PAMU_EEDET 0x006C
+#define PAMU_EEATTR 0x0070
+#define PAMU_EEAHI 0x0074
+#define PAMU_EEALO 0x0078
+#define PAMU_EEDHI 0X007C
+#define PAMU_EEDLO 0x0080
+#define PAMU_EECC  0x0084
+#define PAMU_UDAD  0x0090
+
+/* PAMU Revision Registers */
+#define PAMU_PR1 0x0BF8
+#define PAMU_PR2 0x0BFC
+
+/* PAMU Capabilities Registers */
+#define PAMU_PC1 0x0C00
+#define PAMU_PC2 0x0C04
+#define PAMU_PC3 0x0C08
+#define PAMU_PC4 0x0C0C
+
+/* PAMU Control Register */
+#define PAMU_PC 0x0C10
+
+/* PAMU control defs */
+#define PAMU_CONTROL 0x0C10
+#define PAMU_PC_PGC 0x80000000  /* PAMU gate closed bit */
+#define PAMU_PC_PE   0x40000000 /* PAMU enable bit */
+#define PAMU_PC_SPCC 0x00000010 /* sPAACE cache enable */
+#define PAMU_PC_PPCC 0x00000001 /* pPAACE cache enable */
+#define PAMU_PC_OCE  0x00001000 /* OMT cache enable */
+
+#define PAMU_PFA1 0x0C14
+#define PAMU_PFA2 0x0C18
+
+#define PAMU_PC2_MLIODN(X) ((X) >> 16)
+#define PAMU_PC3_MWCE(X) (((X) >> 21) & 0xf)
+
+/* PAMU Interrupt control and Status Register */
+#define PAMU_PICS 0x0C1C
+#define PAMU_ACCESS_VIOLATION_STAT   0x8
+#define PAMU_ACCESS_VIOLATION_ENABLE 0x4
+
+/* PAMU Debug Registers */
+#define PAMU_PD1 0x0F00
+#define PAMU_PD2 0x0F04
+#define PAMU_PD3 0x0F08
+#define PAMU_PD4 0x0F0C
+
+#define PAACE_AP_PERMS_DENIED  0x0
+#define PAACE_AP_PERMS_QUERY   0x1
+#define PAACE_AP_PERMS_UPDATE  0x2
+#define PAACE_AP_PERMS_ALL     0x3
+
+#define PAACE_DD_TO_HOST       0x0
+#define PAACE_DD_TO_IO         0x1
+#define PAACE_PT_PRIMARY       0x0
+#define PAACE_PT_SECONDARY     0x1
+#define PAACE_V_INVALID        0x0
+#define PAACE_V_VALID          0x1
+#define PAACE_MW_SUBWINDOWS    0x1
+
+#define PAACE_WSE_4K           0xB
+#define PAACE_WSE_8K           0xC
+#define PAACE_WSE_16K          0xD
+#define PAACE_WSE_32K          0xE
+#define PAACE_WSE_64K          0xF
+#define PAACE_WSE_128K         0x10
+#define PAACE_WSE_256K         0x11
+#define PAACE_WSE_512K         0x12
+#define PAACE_WSE_1M           0x13
+#define PAACE_WSE_2M           0x14
+#define PAACE_WSE_4M           0x15
+#define PAACE_WSE_8M           0x16
+#define PAACE_WSE_16M          0x17
+#define PAACE_WSE_32M          0x18
+#define PAACE_WSE_64M          0x19
+#define PAACE_WSE_128M         0x1A
+#define PAACE_WSE_256M         0x1B
+#define PAACE_WSE_512M         0x1C
+#define PAACE_WSE_1G           0x1D
+#define PAACE_WSE_2G           0x1E
+#define PAACE_WSE_4G           0x1F
+
+#define PAACE_DID_PCI_EXPRESS_1 0x00
+#define PAACE_DID_PCI_EXPRESS_2 0x01
+#define PAACE_DID_PCI_EXPRESS_3 0x02
+#define PAACE_DID_PCI_EXPRESS_4 0x03
+#define PAACE_DID_LOCAL_BUS     0x04
+#define PAACE_DID_SRIO          0x0C
+#define PAACE_DID_MEM_1         0x10
+#define PAACE_DID_MEM_2         0x11
+#define PAACE_DID_MEM_3         0x12
+#define PAACE_DID_MEM_4         0x13
+#define PAACE_DID_MEM_1_2       0x14
+#define PAACE_DID_MEM_3_4       0x15
+#define PAACE_DID_MEM_1_4       0x16
+#define PAACE_DID_BM_SW_PORTAL  0x18
+#define PAACE_DID_PAMU          0x1C
+#define PAACE_DID_CAAM          0x21
+#define PAACE_DID_QM_SW_PORTAL  0x3C
+#define PAACE_DID_CORE0_INST    0x80
+#define PAACE_DID_CORE0_DATA    0x81
+#define PAACE_DID_CORE1_INST    0x82
+#define PAACE_DID_CORE1_DATA    0x83
+#define PAACE_DID_CORE2_INST    0x84
+#define PAACE_DID_CORE2_DATA    0x85
+#define PAACE_DID_CORE3_INST    0x86
+#define PAACE_DID_CORE3_DATA    0x87
+#define PAACE_DID_CORE4_INST    0x88
+#define PAACE_DID_CORE4_DATA    0x89
+#define PAACE_DID_CORE5_INST    0x8A
+#define PAACE_DID_CORE5_DATA    0x8B
+#define PAACE_DID_CORE6_INST    0x8C
+#define PAACE_DID_CORE6_DATA    0x8D
+#define PAACE_DID_CORE7_INST    0x8E
+#define PAACE_DID_CORE7_DATA    0x8F
+#define PAACE_DID_BROADCAST     0xFF
+
+#define PAACE_ATM_NO_XLATE      0x00
+#define PAACE_ATM_WINDOW_XLATE  0x01
+#define PAACE_ATM_PAGE_XLATE    0x02
+#define PAACE_ATM_WIN_PG_XLATE  \
+                ( PAACE_ATM_WINDOW_XLATE | PAACE_ATM_PAGE_XLATE )
+#define PAACE_OTM_NO_XLATE      0x00
+#define PAACE_OTM_IMMEDIATE     0x01
+#define PAACE_OTM_INDEXED       0x02
+#define PAACE_OTM_RESERVED      0x03
+
+#define PAACE_M_COHERENCE_REQ   0x01
+
+#define PAACE_PID_0             0x0
+#define PAACE_PID_1             0x1
+#define PAACE_PID_2             0x2
+#define PAACE_PID_3             0x3
+#define PAACE_PID_4             0x4
+#define PAACE_PID_5             0x5
+#define PAACE_PID_6             0x6
+#define PAACE_PID_7             0x7
+
+#define PAACE_TCEF_FORMAT0_8B   0x00
+#define PAACE_TCEF_FORMAT1_RSVD 0x01
+
+#define PAACE_NUMBER_ENTRIES    0x1FF
+
+#define	OME_NUMBER_ENTRIES      16
+
+/* PAACE Bit Field Defines */
+#define PPAACE_AF_WBAL			0xfffff000
+#define PPAACE_AF_WBAL_SHIFT		12
+#define PPAACE_AF_WSE			0x00000fc0
+#define PPAACE_AF_WSE_SHIFT		6
+#define PPAACE_AF_MW			0x00000020
+#define PPAACE_AF_MW_SHIFT		5
+
+#define SPAACE_AF_LIODN			0xffff0000
+#define SPAACE_AF_LIODN_SHIFT		16
+
+#define PAACE_AF_AP			0x00000018
+#define PAACE_AF_AP_SHIFT		3
+#define PAACE_AF_DD			0x00000004
+#define PAACE_AF_DD_SHIFT		2
+#define PAACE_AF_PT			0x00000002
+#define PAACE_AF_PT_SHIFT		1
+#define PAACE_AF_V			0x00000001
+#define PAACE_AF_V_SHIFT		0
+
+#define PAACE_DA_HOST_CR		0x80
+#define PAACE_DA_HOST_CR_SHIFT		7
+
+#define PAACE_IA_CID			0x00FF0000
+#define PAACE_IA_CID_SHIFT		16
+#define PAACE_IA_WCE			0x000000F0
+#define PAACE_IA_WCE_SHIFT		4
+#define PAACE_IA_ATM			0x0000000C
+#define PAACE_IA_ATM_SHIFT		2
+#define PAACE_IA_OTM			0x00000003
+#define PAACE_IA_OTM_SHIFT		0
+
+#define PAACE_WIN_TWBAL			0xfffff000
+#define PAACE_WIN_TWBAL_SHIFT		12
+#define PAACE_WIN_SWSE			0x00000fc0
+#define PAACE_WIN_SWSE_SHIFT		6
+
+/* PAMU Data Structures */
+/* primary / secondary paact structure */
+struct paace {
+	/* PAACE Offset 0x00 */
+	u32 wbah;				/* only valid for Primary PAACE */
+	u32 addr_bitfields;		/* See P/S PAACE_AF_* */
+
+	/* PAACE Offset 0x08 */
+	/* Interpretation of first 32 bits dependent on DD above */
+	union {
+		struct {
+			/* Destination ID, see PAACE_DID_* defines */
+			u8 did;
+			/* Partition ID */
+			u8 pid;
+			/* Snoop ID */
+			u8 snpid;
+			/* coherency_required : 1 reserved : 7 */
+			u8 coherency_required; /* See PAACE_DA_* */
+		} to_host;
+		struct {
+			/* Destination ID, see PAACE_DID_* defines */
+			u8  did;
+			u8  reserved1;
+			u16 reserved2;
+		} to_io;
+	} domain_attr;
+
+	/* Implementation attributes + window count + address & operation translation modes */
+	u32 impl_attr;			/* See PAACE_IA_* */
+
+	/* PAACE Offset 0x10 */
+	/* Translated window base address */
+	u32 twbah;
+	u32 win_bitfields;			/* See PAACE_WIN_* */
+
+	/* PAACE Offset 0x18 */
+	/* first secondary paace entry */
+	u32 fspi;				/* only valid for Primary PAACE */
+	union {
+		struct {
+			u8 ioea;
+			u8 moea;
+			u8 ioeb;
+			u8 moeb;
+		} immed_ot;
+		struct {
+			u16 reserved;
+			u16 omi;
+		} index_ot;
+	} op_encode;
+
+	/* PAACE Offsets 0x20-0x38 */
+	u32 reserved[8];			/* not currently implemented */
+};
+
+/* OME : Operation mapping entry
+ * MOE : Mapped Operation Encodings
+ * The operation mapping table is table containing operation mapping entries (OME).
+ * The index of a particular OME is programmed in the PAACE entry for translation
+ * in bound I/O operations corresponding to an LIODN. The OMT is used for translation
+ * specifically in case of the indexed translation mode. Each OME contains a 128
+ * byte mapped operation encoding (MOE), where each byte represents an MOE. 
+ */
+#define NUM_MOE 128
+struct ome {
+	u8 moe[NUM_MOE];
+} __attribute__((packed));
+
+#define PAACT_SIZE              (sizeof(struct paace) * PAACE_NUMBER_ENTRIES)
+#define OMT_SIZE                (sizeof(struct ome) * OME_NUMBER_ENTRIES)
+
+#define PAMU_PAGE_SHIFT 12
+#define PAMU_PAGE_SIZE  4096ULL
+
+#define IOE_READ        0x00
+#define IOE_READ_IDX    0x00
+#define IOE_WRITE       0x81
+#define IOE_WRITE_IDX   0x01
+#define IOE_EREAD0      0x82    /* Enhanced read type 0 */
+#define IOE_EREAD0_IDX  0x02    /* Enhanced read type 0 */
+#define IOE_EWRITE0     0x83    /* Enhanced write type 0 */
+#define IOE_EWRITE0_IDX 0x03    /* Enhanced write type 0 */
+#define IOE_DIRECT0     0x84    /* Directive type 0 */
+#define IOE_DIRECT0_IDX 0x04    /* Directive type 0 */
+#define IOE_EREAD1      0x85    /* Enhanced read type 1 */
+#define IOE_EREAD1_IDX  0x05    /* Enhanced read type 1 */
+#define IOE_EWRITE1     0x86    /* Enhanced write type 1 */
+#define IOE_EWRITE1_IDX 0x06    /* Enhanced write type 1 */
+#define IOE_DIRECT1     0x87    /* Directive type 1 */
+#define IOE_DIRECT1_IDX 0x07    /* Directive type 1 */
+#define IOE_RAC         0x8c    /* Read with Atomic clear */
+#define IOE_RAC_IDX     0x0c    /* Read with Atomic clear */
+#define IOE_RAS         0x8d    /* Read with Atomic set */
+#define IOE_RAS_IDX     0x0d    /* Read with Atomic set */
+#define IOE_RAD         0x8e    /* Read with Atomic decrement */
+#define IOE_RAD_IDX     0x0e    /* Read with Atomic decrement */
+#define IOE_RAI         0x8f    /* Read with Atomic increment */
+#define IOE_RAI_IDX     0x0f    /* Read with Atomic increment */
+
+#define EOE_READ        0x00
+#define EOE_WRITE       0x01
+#define EOE_RAC         0x0c    /* Read with Atomic clear */
+#define EOE_RAS         0x0d    /* Read with Atomic set */
+#define EOE_RAD         0x0e    /* Read with Atomic decrement */
+#define EOE_RAI         0x0f    /* Read with Atomic increment */
+#define EOE_LDEC        0x10    /* Load external cache */
+#define EOE_LDECL       0x11    /* Load external cache with stash lock */
+#define EOE_LDECPE      0x12    /* Load external cache with preferred exclusive */
+#define EOE_LDECPEL     0x13    /* Load external cache with preferred exclusive and lock */
+#define EOE_LDECFE      0x14    /* Load external cache with forced exclusive */
+#define EOE_LDECFEL     0x15    /* Load external cache with forced exclusive and lock */
+#define EOE_RSA         0x16    /* Read with stash allocate */
+#define EOE_RSAU        0x17    /* Read with stash allocate and unlock */
+#define EOE_READI       0x18    /* Read with invalidate */
+#define EOE_RWNITC      0x19    /* Read with no intention to cache */
+#define EOE_WCI         0x1a    /* Write cache inhibited */
+#define EOE_WWSA        0x1b    /* Write with stash allocate */
+#define EOE_WWSAL       0x1c    /* Write with stash allocate and lock */
+#define EOE_WWSAO       0x1d    /* Write with stash allocate only */
+#define EOE_WWSAOL      0x1e    /* Write with stash allocate only and lock */
+#define EOE_VALID       0x80
+
+/* Function prototypes */
+int pamu_domain_init(void);
+int pamu_enable_liodn(int liodn);
+int pamu_disable_liodn(int liodn);
+void pamu_free_subwins(int liodn);
+int pamu_config_ppaace(int liodn, phys_addr_t win_addr, phys_addr_t win_size,
+		       u32 omi, unsigned long rpn, u32 snoopid, uint32_t stashid,
+		       u32 subwin_cnt, int prot);
+int pamu_config_spaace(int liodn, u32 subwin_cnt, u32 subwin_addr,
+		       phys_addr_t subwin_size, u32 omi, unsigned long rpn,
+		       uint32_t snoopid, u32 stashid, int enable, int prot);
+
+u32 get_stash_id(u32 stash_dest_hint, u32 vcpu);
+void get_ome_index(u32 *omi_index, struct device *dev);
+int  pamu_update_paace_stash(int liodn, u32 subwin, u32 value);
+int pamu_disable_spaace(int liodn, u32 subwin);
+
+#endif  /* __FSL_PAMU_H */
diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
new file mode 100644
index 0000000..15b9909
--- /dev/null
+++ b/drivers/iommu/fsl_pamu_domain.c
@@ -0,0 +1,1135 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * Copyright (C) 2012 Freescale Semiconductor, Inc.
+ * Author: Varun Sethi <varun.sethi@freescale.com>
+ *
+ */
+
+#define pr_fmt(fmt)    "fsl-pamu-domain: %s: " fmt, __func__
+
+#include <linux/init.h>
+#include <linux/iommu.h>
+#include <linux/notifier.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/of_platform.h>
+#include <linux/bootmem.h>
+#include <linux/err.h>
+#include <asm/io.h>
+#include <asm/bitops.h>
+
+#include <asm/pci-bridge.h>
+
+#include "fsl_pamu_domain.h"
+
+/* 
+ * Global spinlock that needs to be held while
+ * configuring PAMU.
+ */
+static DEFINE_SPINLOCK(iommu_lock);
+
+static struct kmem_cache *fsl_pamu_domain_cache;
+static struct kmem_cache *iommu_devinfo_cache;
+static DEFINE_SPINLOCK(device_domain_lock);
+
+int __init iommu_init_mempool(void)
+{
+
+	fsl_pamu_domain_cache = kmem_cache_create("fsl_pamu_domain",
+					 sizeof(struct fsl_dma_domain),
+					 0,
+					 SLAB_HWCACHE_ALIGN,
+
+					 NULL);
+	if (!fsl_pamu_domain_cache) {
+		pr_err("Couldn't create fsl iommu_domain cache\n");
+		return -ENOMEM;
+	}
+
+	iommu_devinfo_cache = kmem_cache_create("iommu_devinfo",
+					 sizeof(struct device_domain_info),
+					 0,
+					 SLAB_HWCACHE_ALIGN,
+					 NULL);
+	if (!iommu_devinfo_cache) {
+		pr_err("Couldn't create devinfo cache\n");
+		kmem_cache_destroy(fsl_pamu_domain_cache);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static phys_addr_t get_phys_addr(struct fsl_dma_domain *dma_domain, unsigned long iova)
+{
+	u32 win_cnt = dma_domain->win_cnt;
+	struct dma_window *win_ptr =
+				&dma_domain->win_arr[0];
+	struct iommu_domain_geometry *geom;
+
+	geom = &dma_domain->iommu_domain->geometry;
+
+	if (!win_cnt || !dma_domain->geom_size) {
+		pr_err("Number of windows/geometry not configured for the domain\n");
+		return 0;
+	}
+
+	if (win_cnt > 1) {
+		u64 subwin_size;
+		unsigned long subwin_iova;
+		u32 wnd;
+
+		subwin_size = dma_domain->geom_size >> ilog2(win_cnt);
+		subwin_iova = iova & ~(subwin_size - 1);
+		wnd = (subwin_iova - geom->aperture_start) >> ilog2(subwin_size);
+		win_ptr = &dma_domain->win_arr[wnd];
+	}
+
+	if (win_ptr->valid)
+		return (win_ptr->paddr + (iova & (win_ptr->size - 1)));
+
+	return 0;
+}
+
+static int map_liodn_subwins(int liodn, struct fsl_dma_domain *dma_domain)
+{
+	struct dma_window *sub_win_ptr = 
+				&dma_domain->win_arr[0];
+	int i, ret;
+	unsigned long rpn;
+
+	for (i = 0; i < dma_domain->win_cnt; i++) {
+		if (sub_win_ptr[i].valid) {
+			rpn = sub_win_ptr[i].paddr >>
+				 PAMU_PAGE_SHIFT;
+			spin_lock(&iommu_lock);
+			ret = pamu_config_spaace(liodn, dma_domain->win_cnt, i,
+						 sub_win_ptr[i].size,
+						 ~(u32)0,
+						 rpn,
+						 dma_domain->snoop_id,
+						 dma_domain->stash_id,
+						 (i > 0) ? 1 : 0,
+						 sub_win_ptr[i].prot);
+			spin_unlock(&iommu_lock);
+			if (ret) {
+				pr_err("PAMU SPAACE configuration failed for liodn %d\n",
+					 liodn);
+				return ret;
+			}
+		}
+	}
+
+	return ret;
+}
+
+static int map_liodn_win(int liodn, struct fsl_dma_domain *dma_domain)
+{
+	int ret;
+	struct dma_window *wnd = &dma_domain->win_arr[0];
+	phys_addr_t wnd_addr = dma_domain->iommu_domain->geometry.aperture_start;
+
+	spin_lock(&iommu_lock);
+	ret = pamu_config_ppaace(liodn, wnd_addr,
+				 wnd->size,
+				 ~(u32)0,
+				 wnd->paddr >> PAMU_PAGE_SHIFT,
+				 dma_domain->snoop_id, dma_domain->stash_id,
+				 0, wnd->prot);
+	spin_unlock(&iommu_lock);
+	if (ret)
+		pr_err("PAMU PAACE configuration failed for liodn %d\n",
+			liodn);
+
+	return ret;
+}
+
+/* Map the DMA window corresponding to the LIODN */
+static int map_liodn(int liodn, struct fsl_dma_domain *dma_domain)
+{
+	if (dma_domain->win_cnt > 1)
+		return map_liodn_subwins(liodn, dma_domain);
+	else
+		return map_liodn_win(liodn, dma_domain);
+
+}
+
+/* Update window/subwindow mapping for the LIODN */
+static int update_liodn(int liodn, struct fsl_dma_domain *dma_domain, u32 wnd_nr)
+{
+	int ret;
+	struct dma_window *wnd = &dma_domain->win_arr[wnd_nr];
+
+	spin_lock(&iommu_lock);
+	if (dma_domain->win_cnt > 1) {
+		ret = pamu_config_spaace(liodn, dma_domain->win_cnt, wnd_nr,
+					 wnd->size,
+					 ~(u32)0,
+					 wnd->paddr >> PAMU_PAGE_SHIFT,
+					 dma_domain->snoop_id,
+					 dma_domain->stash_id,
+					 (wnd_nr > 0) ? 1 : 0,
+					 wnd->prot);
+		if (ret)
+			pr_err("Subwindow reconfiguration failed for liodn %d\n", liodn);
+	} else {
+		phys_addr_t wnd_addr;
+
+		wnd_addr = dma_domain->iommu_domain->geometry.aperture_start;
+
+		ret = pamu_config_ppaace(liodn, wnd_addr,
+					 wnd->size,
+					 ~(u32)0,
+					 wnd->paddr >> PAMU_PAGE_SHIFT,
+				 	dma_domain->snoop_id, dma_domain->stash_id,
+				 	0, wnd->prot);
+		if (ret)
+			pr_err("Window reconfiguration failed for liodn %d\n", liodn);
+	}
+
+	spin_unlock(&iommu_lock);
+
+	return ret;
+}
+
+static int update_liodn_stash(int liodn, struct fsl_dma_domain *dma_domain,
+				 u32 val)
+{
+	int ret = 0, i;
+
+	spin_lock(&iommu_lock);
+	if (!dma_domain->win_cnt) {
+		ret = pamu_update_paace_stash(liodn, 0, val);
+		if (ret) {
+			pr_err("Failed to update PAACE field for liodn %d\n ", liodn);
+			spin_unlock(&iommu_lock);
+			return ret;
+		}
+	} else {
+		for (i = 0; i < dma_domain->win_cnt; i++) {
+			ret = pamu_update_paace_stash(liodn, i, val);
+			if (ret) {
+				pr_err("Failed to update SPAACE %d field for liodn %d\n ", i, liodn);
+				spin_unlock(&iommu_lock);
+				return ret;
+			}
+		}
+	}
+	spin_unlock(&iommu_lock);
+
+	return ret;
+}
+
+/* Set the geometry parameters for a LIODN */
+static int configure_liodn(int liodn, struct device *dev,
+			   struct fsl_dma_domain *dma_domain,
+			   struct iommu_domain_geometry *geom_attr,
+			   u32 win_cnt)
+{
+	phys_addr_t window_addr, window_size;
+	phys_addr_t subwin_size;
+	int ret = 0, i;
+	u32 omi_index = ~(u32)0;
+
+	/* 
+	 * Configure the omi_index at the geometry setup time.
+	 * This is a static value which depends on the type of
+	 * device and would not change thereafter.
+	 */
+	get_ome_index(&omi_index, dev);
+
+	window_addr = geom_attr->aperture_start;
+	window_size = dma_domain->geom_size;
+
+	spin_lock(&iommu_lock);
+	ret = pamu_disable_liodn(liodn);
+	if (!ret)
+		ret = pamu_config_ppaace(liodn, window_addr, window_size, omi_index,
+					 0, dma_domain->snoop_id,
+					 dma_domain->stash_id, win_cnt, 0);
+	spin_unlock(&iommu_lock);
+	if (ret) {
+		pr_err("PAMU PAACE configuration failed for liodn %d, win_cnt =%d\n", liodn, win_cnt);
+		return ret;
+	}
+
+	if (win_cnt > 1) {
+		subwin_size = window_size >> ilog2(win_cnt);
+		for (i = 0; i < win_cnt; i++) {
+			spin_lock(&iommu_lock);
+			ret = pamu_config_spaace(liodn, win_cnt, i, subwin_size,
+						 omi_index, 0,
+						 dma_domain->snoop_id,
+						 dma_domain->stash_id, 0, 0);
+			spin_unlock(&iommu_lock);
+			if (ret) {
+				pr_err("PAMU SPAACE configuration failed for liodn %d\n", liodn);
+				return ret;
+			}
+		}
+	}
+
+	return ret;
+}
+
+static int check_size(u64 size, unsigned long iova)
+{
+	/*
+	 * Size must be a power of two and at least be equal
+	 * to PAMU page size.
+	 */
+	if ((size & (size - 1)) || size < PAMU_PAGE_SIZE) {
+		pr_err("%s: size too small or not a power of two\n", __func__);
+		return -EINVAL;
+	}
+
+	/* iova must be page size aligned*/
+	if (iova & (size - 1)) {
+		pr_err("%s: address is not aligned with window size\n", __func__);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static struct fsl_dma_domain *iommu_alloc_dma_domain(void)
+{
+	struct fsl_dma_domain *domain;
+
+	domain = kmem_cache_zalloc(fsl_pamu_domain_cache, GFP_KERNEL);
+	if (!domain)
+		return NULL;
+
+	domain->stash_id = ~(u32)0;
+	domain->snoop_id = ~(u32)0;
+	domain->win_cnt = max_subwindow_count;
+	domain->geom_size = 0;
+
+	INIT_LIST_HEAD(&domain->devices);
+
+	spin_lock_init(&domain->domain_lock);
+
+	return domain;
+}
+
+static inline struct device_domain_info *find_domain(struct device *dev)
+{
+	return dev->archdata.iommu_domain;
+}
+
+static void remove_domain_ref(struct device_domain_info *info, u32 win_cnt)
+{
+		list_del(&info->link);
+		spin_lock(&iommu_lock);
+		if (win_cnt)
+			pamu_free_subwins(info->liodn);
+		pamu_disable_liodn(info->liodn);
+		spin_unlock(&iommu_lock);
+		spin_lock(&device_domain_lock);
+		info->dev->archdata.iommu_domain = NULL;
+		kmem_cache_free(iommu_devinfo_cache, info);
+		spin_unlock(&device_domain_lock);
+}
+
+static void destroy_domain(struct fsl_dma_domain *dma_domain)
+{
+	struct device_domain_info *info;
+
+	/* Dissociate all the devices from this domain */
+	while (!list_empty(&dma_domain->devices)) {
+		info = list_entry(dma_domain->devices.next,
+			struct device_domain_info, link);
+		remove_domain_ref(info, dma_domain->win_cnt);
+	}
+}
+
+static void detach_domain(struct device *dev, struct fsl_dma_domain *dma_domain)
+{
+	struct device_domain_info *info;
+	struct list_head *entry, *tmp;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dma_domain->domain_lock, flags);
+	/* Remove the device from the domain device list */
+	if (!list_empty(&dma_domain->devices)) {
+		list_for_each_safe(entry, tmp, &dma_domain->devices) {
+			info = list_entry(entry, struct device_domain_info, link);
+			if (info->dev == dev)
+				remove_domain_ref(info, dma_domain->win_cnt);
+		}
+	}
+	spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+}
+
+static void attach_domain(struct fsl_dma_domain *dma_domain, int liodn, struct device *dev)
+{
+	struct device_domain_info *info, *old_domain_info;
+
+	spin_lock(&device_domain_lock);
+	/* 
+	 * Check here if the device is already attached to domain or not.
+	 * If the device is already attached to a domain detach it.
+	 */
+	old_domain_info = find_domain(dev);
+	if (old_domain_info && old_domain_info->domain != dma_domain) {
+		spin_unlock(&device_domain_lock);
+		detach_domain(dev, old_domain_info->domain);
+		spin_lock(&device_domain_lock);
+	}
+
+	info = kmem_cache_zalloc(iommu_devinfo_cache, GFP_KERNEL);
+
+	info->dev = dev;
+	info->liodn = liodn;
+	info->domain = dma_domain;
+
+	list_add(&info->link, &dma_domain->devices);
+	/* 
+	 * In case of devices with multiple LIODNs just store
+	 * the info for the first LIODN as all
+	 * LIODNs share the same domain
+	 */
+	if (!old_domain_info)
+		dev->archdata.iommu_domain = info;
+	spin_unlock(&device_domain_lock);
+
+}
+
+static phys_addr_t fsl_pamu_iova_to_phys(struct iommu_domain *domain,
+					    unsigned long iova)
+{
+	struct fsl_dma_domain *dma_domain = domain->priv;
+
+	if ((iova < domain->geometry.aperture_start) ||
+		iova > (domain->geometry.aperture_end))
+		return 0;
+
+	return get_phys_addr(dma_domain, iova);
+}
+
+static int fsl_pamu_domain_has_cap(struct iommu_domain *domain,
+				      unsigned long cap)
+{
+	return cap == IOMMU_CAP_CACHE_COHERENCY;
+}
+
+static void fsl_pamu_domain_destroy(struct iommu_domain *domain)
+{
+	struct fsl_dma_domain *dma_domain = domain->priv;
+
+	domain->priv = NULL;
+
+	destroy_domain(dma_domain);
+
+	dma_domain->enabled = 0;
+	dma_domain->mapped = 0;
+
+	kmem_cache_free(fsl_pamu_domain_cache, dma_domain);
+}
+
+static int fsl_pamu_domain_init(struct iommu_domain *domain)
+{
+	struct fsl_dma_domain *dma_domain;
+
+	dma_domain = iommu_alloc_dma_domain();
+	if (!dma_domain) {
+		pr_err("dma_domain allocation failed\n");
+		return -ENOMEM;
+	}
+	domain->priv = dma_domain;
+	dma_domain->iommu_domain = domain;
+	/* defaul geometry 64 GB i.e. maximum system address */
+	domain->geometry.aperture_start = 0;
+	domain->geometry.aperture_end = 1ULL << 36; 
+	domain->geometry.force_aperture = true;
+
+	return 0;
+}
+
+/* Configure geometry settings for all LIODNs associated with domain */
+static int configure_domain(struct fsl_dma_domain *dma_domain,
+			    struct iommu_domain_geometry *geom_attr,
+			    u32 win_cnt)
+{
+	struct device_domain_info *info;
+	int ret = 0;
+
+	if (!list_empty(&dma_domain->devices)) {
+		list_for_each_entry(info, &dma_domain->devices, link) {
+			ret = configure_liodn(info->liodn, info->dev, dma_domain,
+					      geom_attr, win_cnt);
+			if (ret)
+				break;
+		}
+	}
+
+	return ret;
+}
+
+/* Update stash destination for all LIODNs associated with the domain */
+static int update_domain_stash(struct fsl_dma_domain *dma_domain, u32 val)
+{
+	struct device_domain_info *info;
+	int ret = 0;
+
+	if (!list_empty(&dma_domain->devices)) {
+		list_for_each_entry(info, &dma_domain->devices, link) {
+			ret = update_liodn_stash(info->liodn, dma_domain, val);
+			if (ret)
+				break;
+		}
+	}
+
+	return ret;
+}
+
+/* Update domain mappings for all LIODNs associated with the domain */
+static int update_domain_mapping(struct fsl_dma_domain *dma_domain, u32 wnd_nr)
+{
+	struct device_domain_info *info;
+	int ret = 0;
+
+	if (!list_empty(&dma_domain->devices)) {
+		list_for_each_entry(info, &dma_domain->devices, link) {
+			ret = update_liodn(info->liodn, dma_domain, wnd_nr);
+			if (ret)
+				break;
+		}
+	}
+	return ret;
+}
+
+static int disable_domain_win(struct fsl_dma_domain *dma_domain, u32 wnd_nr)
+{
+	struct device_domain_info *info;
+	int ret = 0;
+
+	if (!list_empty(&dma_domain->devices)) {
+		list_for_each_entry(info, &dma_domain->devices, link) {
+			if (dma_domain->win_cnt == 1 && dma_domain->enabled) {
+				ret = pamu_disable_liodn(info->liodn);
+				if (!ret)
+					dma_domain->enabled = 0;
+			} else {
+				ret = pamu_disable_spaace(info->liodn, wnd_nr);
+			}
+		}
+	}
+
+	return ret;
+}
+
+static void fsl_pamu_window_disable(struct iommu_domain *domain, u32 wnd_nr)
+{
+	struct fsl_dma_domain *dma_domain = domain->priv;
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&dma_domain->domain_lock, flags);
+	if (!dma_domain->win_arr) {
+		pr_err("Number of windows not configured\n");
+		spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+		return;
+	}
+
+	if (wnd_nr >= dma_domain->win_cnt) {
+		pr_err("Invalid window index\n");
+		spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+		return;
+	}
+
+	if (dma_domain->win_arr[wnd_nr].valid) {
+		ret = disable_domain_win(dma_domain, wnd_nr);
+		if (!ret) {
+			dma_domain->win_arr[wnd_nr].valid = 0;
+			dma_domain->mapped--;
+		}
+	}
+
+	spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+
+}
+
+static int fsl_pamu_window_enable(struct iommu_domain *domain, u32 wnd_nr,
+				  phys_addr_t paddr, u64 size, int iommu_prot)
+{
+	struct fsl_dma_domain *dma_domain = domain->priv;
+	struct dma_window *wnd;
+	int prot = 0;
+	int ret;
+	unsigned long flags;
+	u64 win_size;
+
+	if (iommu_prot & IOMMU_READ)
+		prot |= PAACE_AP_PERMS_QUERY;
+	if (iommu_prot & IOMMU_WRITE)
+		prot |= PAACE_AP_PERMS_UPDATE;
+
+	spin_lock_irqsave(&dma_domain->domain_lock, flags);
+	if (!dma_domain->win_arr) {
+		pr_err("Number of windows not configured\n");
+		spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+		return -ENODEV;
+	}
+
+	if (wnd_nr >= dma_domain->win_cnt) {
+		pr_err("Invalid window index\n");
+		spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+		return -EINVAL;
+	}
+
+	win_size = dma_domain->geom_size >> ilog2(dma_domain->win_cnt);
+	if (size > win_size) {
+		pr_err("Invalid window size \n");
+		spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+		return -EINVAL;
+	}
+
+	if (dma_domain->win_cnt == 1) {
+		if (dma_domain->enabled) {
+			pr_err("Disable the window before updating the mapping\n");
+			spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+			return -EBUSY;
+		}
+
+		ret = check_size(size, domain->geometry.aperture_start);
+		if (ret) {
+			pr_err("Aperture start not aligned to the size\n");
+			spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+			return -EINVAL;
+		}
+	}
+
+	wnd = &dma_domain->win_arr[wnd_nr];
+	if (!wnd->valid) {
+		wnd->paddr = paddr;
+		wnd->size = size;
+		wnd->prot = prot;
+
+		ret = update_domain_mapping(dma_domain, wnd_nr);
+		if (!ret) {
+			wnd->valid = 1;
+			dma_domain->mapped++;
+		}
+	} else {
+		pr_err("Disable the window before updating the mapping\n");
+		ret = -EBUSY;
+	}
+
+	spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+
+	return ret;
+}
+
+/*
+ * Attach the LIODN to the DMA domain and configure the geometry
+ * and window mappings.
+ */
+static int handle_attach_device(struct fsl_dma_domain *dma_domain,
+				 struct device *dev, const u32 *liodn,
+				 int num)
+{
+	unsigned long flags;
+	struct iommu_domain *domain = dma_domain->iommu_domain;
+	int ret = 0;
+	int i;
+
+	spin_lock_irqsave(&dma_domain->domain_lock, flags);
+	for (i = 0; i < num; i++) {
+
+		/* Ensure that LIODN value is valid */
+		if (liodn[i] > PAACE_NUMBER_ENTRIES) {
+			pr_err("Invalid liodn %d, attach device failed for %s\n",
+		          	liodn[i], dev->of_node->full_name);
+			ret = -EINVAL;
+			break;
+		} 
+
+		attach_domain(dma_domain, liodn[i], dev);
+		/*
+		 * Check if geometry has already been configured
+		 * for the domain. If yes, set the geometry for
+		 * the LIODN.
+		 */
+		if (dma_domain->win_cnt) {
+			u32 win_cnt = dma_domain->win_cnt > 1 ? dma_domain->win_cnt : 0;
+			ret = configure_liodn(liodn[i], dev, dma_domain,
+					      &domain->geometry,
+					      win_cnt);
+			if (ret)
+				break;
+			if (dma_domain->mapped) {
+				/*
+				 * Create window/subwindow mapping for
+				 * the LIODN.
+				 */
+				ret = map_liodn(liodn[i], dma_domain);
+				if (ret)
+					break;
+			}
+		}
+	}
+	spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+
+	return ret;
+}
+
+static int fsl_pamu_attach_device(struct iommu_domain *domain,
+				  struct device *dev)
+{
+	struct fsl_dma_domain *dma_domain = domain->priv;
+	const u32 *prop;
+	u32 prop_cnt;
+	int len, ret = 0;
+	struct pci_dev *pdev = NULL;
+	struct pci_controller *pci_ctl;
+
+	/*
+	 * Hack to make attach device work for the PCI devices. Simply assign the
+	 * the LIODN for the PCI controller to the PCI device.
+	 */
+	if (dev->bus == &pci_bus_type) {
+		pdev = to_pci_dev(dev);
+		pci_ctl = pci_bus_to_host(pdev->bus);
+		/*
+		 * make dev point to pci controller device
+		 * so we can get the LIODN programmed by
+		 * u-boot;
+		 */
+		dev = pci_ctl->parent;
+	}
+
+	prop = of_get_property(dev->of_node, "fsl,liodn", &len);
+	if (prop) {
+		prop_cnt = len / sizeof(u32);
+		ret = handle_attach_device(dma_domain, dev,
+					 prop, prop_cnt);
+	} else {
+		pr_err("missing fsl,liodn property at %s\n",
+		          dev->of_node->full_name);
+			ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static void fsl_pamu_detach_device(struct iommu_domain *domain,
+				      struct device *dev)
+{
+	struct fsl_dma_domain *dma_domain = domain->priv;
+	const u32 *prop;
+	int len;
+	struct pci_dev *pdev = NULL;
+	struct pci_controller *pci_ctl;
+
+	/*
+	 * Hack to make detach device work for the PCI devices. Simply assign the
+	 * the LIODN for the PCI controller to the PCI device.
+	 */
+	if (dev->bus == &pci_bus_type) {
+		pdev = to_pci_dev(dev);
+		pci_ctl = pci_bus_to_host(pdev->bus);
+		/*
+		 * make dev point to pci controller device
+		 * so we can get the LIODN programmed by
+		 * u-boot;
+		 */
+		dev = pci_ctl->parent;
+	}
+
+	prop = of_get_property(dev->of_node, "fsl,liodn", &len);
+	if (prop)
+		detach_domain(dev, dma_domain);
+	else
+		pr_err("missing fsl,liodn property at %s\n",
+		          dev->of_node->full_name);
+}
+
+static  int configure_domain_geometry(struct iommu_domain *domain, void *data)
+{
+	struct iommu_domain_geometry *geom_attr = data;
+	struct fsl_dma_domain *dma_domain = domain->priv;
+	dma_addr_t geom_size;
+	unsigned long flags;
+
+	geom_size = geom_attr->aperture_end - geom_attr->aperture_start;
+	/*
+	 * Sanity check the geometry size. Also, we do not support
+	 * DMA outside of the geometry.
+	 */
+	if (check_size(geom_size, geom_attr->aperture_start) ||
+		!geom_attr->force_aperture) {
+			pr_err("Invalid PAMU geometry attributes\n");
+			return -EINVAL;
+		}
+
+	spin_lock_irqsave(&dma_domain->domain_lock, flags);
+	if (dma_domain->enabled) {
+		pr_err("Can't set geometry attributes as domain is active\n");
+		spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+		return  -EBUSY;
+	}
+
+	/* Copy the domain geometry information */
+	memcpy(&domain->geometry, geom_attr,
+	       sizeof(struct iommu_domain_geometry));
+	dma_domain->geom_size = geom_size;
+
+	spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+
+	return 0;
+}
+
+/* Set the domain stash attribute */
+static int configure_domain_stash(struct fsl_dma_domain *dma_domain, void *data)
+{
+	struct iommu_stash_attribute *stash_attr = data;
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&dma_domain->domain_lock, flags);
+
+	memcpy(&dma_domain->dma_stash, stash_attr,
+		 sizeof(struct iommu_stash_attribute));
+
+	dma_domain->stash_id = get_stash_id(stash_attr->cache,
+					    stash_attr->cpu);
+	if (dma_domain->stash_id == ~(u32)0) {
+		pr_err("Invalid stash attributes\n");
+		spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+		return -EINVAL;
+	}
+
+	ret = update_domain_stash(dma_domain, dma_domain->stash_id);
+
+	spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+
+	return ret;
+}
+
+/* Configure domain dma state i.e. enable/disable DMA*/
+static int configure_domain_dma_state(struct fsl_dma_domain *dma_domain, bool enable)
+{
+	struct device_domain_info *info;
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&dma_domain->domain_lock, flags);
+
+	if (enable && !dma_domain->mapped) {
+		pr_err("Can't enable DMA domain without valid mapping\n");
+		spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+		return -ENODEV;
+	}
+
+	dma_domain->enabled = enable;
+	if (!list_empty(&dma_domain->devices)) {
+		list_for_each_entry(info, &dma_domain->devices,
+					 link) {
+			ret = (enable) ? pamu_enable_liodn(info->liodn):
+				pamu_disable_liodn(info->liodn);
+			if (ret)
+				pr_err("Unable to set dma state for liodn %d",
+					 info->liodn);
+		}
+	}
+	spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+
+	return 0;
+}
+
+int fsl_pamu_set_domain_attr(struct iommu_domain *domain,
+				 enum iommu_attr attr_type, void *data)
+{
+	struct fsl_dma_domain *dma_domain = domain->priv;
+	int ret = 0;
+
+
+	switch(attr_type) {
+	case DOMAIN_ATTR_GEOMETRY:
+		ret = configure_domain_geometry(domain, data);
+		break;
+	case DOMAIN_ATTR_PAMU_STASH:
+		ret = configure_domain_stash(dma_domain, data);
+		break;
+	case DOMAIN_ATTR_PAMU_ENABLE:
+		ret = configure_domain_dma_state(dma_domain, *(int *)data);
+		break;
+	default:
+		pr_err("Unsupported attribute type\n");
+		ret = -EINVAL;
+		break;
+	};
+
+	return ret;
+}
+
+int fsl_pamu_get_domain_attr(struct iommu_domain *domain,
+				 enum iommu_attr attr_type, void *data)
+{
+	struct fsl_dma_domain *dma_domain = domain->priv;
+	int ret = 0;
+
+
+	switch(attr_type) {
+	case DOMAIN_ATTR_PAMU_STASH:
+		memcpy((struct iommu_stash_attribute *) data, &dma_domain->dma_stash,
+				 sizeof(struct iommu_stash_attribute));
+		break;
+	case DOMAIN_ATTR_PAMU_ENABLE:
+		*(int *)data = dma_domain->enabled;
+		break;
+	case DOMAIN_ATTR_FSL_PAMUV1:
+		*(int *)data = DOMAIN_ATTR_FSL_PAMUV1;
+		break;
+	default:
+		pr_err("Unsupported attribute type\n");
+		ret = -EINVAL;
+		break;
+	};
+
+	return ret;
+}
+
+static void swap_pci_ref(struct pci_dev **from, struct pci_dev *to)
+{
+	pci_dev_put(*from);
+	*from = to;
+}
+
+static struct iommu_group *get_device_iommu_group(struct device *dev)
+{
+	struct iommu_group *group;
+
+	group = iommu_group_get(dev);
+	if (!group)
+		group = iommu_group_alloc();
+
+	return group;
+}
+
+static  bool check_pci_ctl_endpt_part(struct pci_controller *pci_ctl)
+{
+	u32 version;
+
+	/* Check the PCI controller version number by readding BRR1 register */
+	version = in_be32(pci_ctl->cfg_addr + (PCI_FSL_BRR1 >> 2));
+	version &= PCI_FSL_BRR1_VER;
+	/* If PCI controller version is >= 0x204 we can partition endpoints*/
+	if (version >= 0x204)
+		return 1;
+
+	return 0;
+}
+
+static int fsl_pamu_add_device(struct device *dev)
+{
+	struct iommu_group *group = NULL;
+	struct pci_dev *pdev;
+	struct pci_dev *bridge, *dma_pdev = NULL;
+	struct pci_controller *pci_ctl;
+	int ret;
+
+	/*
+	 * For platform devices we allocate a separate group for
+	 * each of the devices.
+	 */
+	if (dev->bus == &pci_bus_type) {
+		bool pci_endpt_part;
+
+		pdev = to_pci_dev(dev);
+		/* Don't create device groups for virtual PCI bridges */
+		if (pdev->subordinate)
+			return 0;
+
+		pci_ctl = pci_bus_to_host(pdev->bus);
+		pci_endpt_part = check_pci_ctl_endpt_part(pci_ctl);
+		/* We can partition PCIe devices so assign device group to the device */
+		if (pci_endpt_part) {
+			bridge = pci_find_upstream_pcie_bridge(pdev);
+			if (bridge) {
+				if (pci_is_pcie(bridge))
+					dma_pdev = pci_get_domain_bus_and_slot(
+								pci_domain_nr(pdev->bus),
+								bridge->subordinate->number, 0);
+				if (!dma_pdev)
+					dma_pdev = pci_dev_get(bridge);
+			} else
+				dma_pdev = pci_dev_get(pdev);
+			/* Account for quirked devices */
+			swap_pci_ref(&dma_pdev, pci_get_dma_source(dma_pdev));
+			group = get_device_iommu_group(&pdev->dev);
+			pci_dev_put(pdev);
+			/*
+			 * PCIe controller is not a paritionable entity 
+			 * free the controller device iommu_group.
+			 */
+			if (pci_ctl->parent->iommu_group)
+				iommu_group_remove_device(pci_ctl->parent);
+		} else {
+			/*
+			 * All devices connected to the controller will share the
+			 * PCI controllers device group. If this is the first
+			 * device to be probed for the pci controller, copy the 
+			 * device group information from the PCI controller device
+			 * node and remove the PCI controller iommu group.
+			 * For subsequent devices, the iommu group information can
+			 * be obtained from sibling devices (i.e. from the bus_devices
+			 * link list).
+			 */
+			if (pci_ctl->parent->iommu_group) {
+				group = get_device_iommu_group(pci_ctl->parent);
+				iommu_group_remove_device(pci_ctl->parent);
+			} else {
+				/* check if this is the first device on the bus*/
+				if (pdev->bus_list.next == pdev->bus_list.prev) {
+					struct pci_bus *bus = pdev->bus->parent;
+					int found = 0;
+					/* Traverese the parent bus list to get
+					 * pdev & dev for the sibling device.
+					 */
+					while (bus) {
+						if (!list_empty(&bus->devices)) {
+							pdev = container_of(bus->devices.next,
+								 struct pci_dev, bus_list);
+							group = iommu_group_get(&pdev->dev);
+							/* 
+							 * All devices should be associated with
+							 * a group.
+							 */
+							if (group)
+								found = 1;
+							break;
+						} else
+							bus = bus->parent;
+					}
+					if (!found)
+						dev_err(&pdev->dev, "Failed to allocate group for the device\n");
+				} else {
+					/*
+					 * Get the pdev & dev for the sibling device
+					 */
+					pdev = container_of(pdev->bus_list.prev, struct pci_dev, bus_list);
+					group = iommu_group_get(&pdev->dev);
+				}
+			}
+		}
+	} else
+		group = get_device_iommu_group(dev);
+
+	if (IS_ERR(group))
+		return PTR_ERR(group);
+
+	ret = iommu_group_add_device(group, dev);
+
+	iommu_group_put(group);
+	return ret;
+}
+
+static void fsl_pamu_remove_device(struct device *dev)
+{
+	iommu_group_remove_device(dev);
+}
+
+static int fsl_pamu_set_windows(struct iommu_domain *domain, u32 w_count)
+{
+	struct fsl_dma_domain *dma_domain = domain->priv;
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&dma_domain->domain_lock, flags);
+	/* Ensure domain is inactive i.e. DMA should be disabled for the domain */
+	if (dma_domain->enabled) {
+		pr_err("Can't set geometry attributes as domain is active\n");
+		spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+		return  -EBUSY;
+	}
+
+	/* Ensure that the geometry has been set for the domain */
+	if (!dma_domain->geom_size) {
+		pr_err("Please configure geometry before setting the number of windows\n");
+		spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+		return -EINVAL;
+	}
+
+	/* 
+	 * Ensure we have valid window count i.e. it should be less than
+	 * maximum permissible limit and should be a power of two.
+	 */
+	if (w_count > max_subwindow_count || (w_count & (w_count - 1))) {
+		pr_err("Invalid window count\n");
+		spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+		return -EINVAL;
+	}
+
+	ret = configure_domain(dma_domain, &domain->geometry, 
+				((w_count > 1) ? w_count : 0));
+	if (!ret) {
+		if (dma_domain->win_arr)
+			kfree(dma_domain->win_arr);
+		dma_domain->win_arr = kzalloc(sizeof(struct dma_window) *
+							  w_count, GFP_KERNEL);
+		if (!dma_domain->win_arr) {
+			spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+			return -ENOMEM;
+		}
+		dma_domain->win_cnt = w_count;
+	}
+	spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
+	
+	return ret;
+}
+
+static u32 fsl_pamu_get_windows(struct iommu_domain *domain)
+{
+	struct fsl_dma_domain *dma_domain = domain->priv;
+
+	return dma_domain->win_cnt;
+}
+
+static struct iommu_ops fsl_pamu_ops = {
+	.domain_init	= fsl_pamu_domain_init,
+	.domain_destroy = fsl_pamu_domain_destroy,
+	.attach_dev	= fsl_pamu_attach_device,
+	.detach_dev	= fsl_pamu_detach_device,
+	.domain_window_enable = fsl_pamu_window_enable,
+	.domain_window_disable = fsl_pamu_window_disable,
+	.domain_get_windows = fsl_pamu_get_windows,
+	.domain_set_windows = fsl_pamu_set_windows,
+	.iova_to_phys	= fsl_pamu_iova_to_phys,
+	.domain_has_cap = fsl_pamu_domain_has_cap,
+	.domain_set_attr = fsl_pamu_set_domain_attr,
+	.domain_get_attr = fsl_pamu_get_domain_attr,
+	.add_device	= fsl_pamu_add_device,
+	.remove_device	= fsl_pamu_remove_device,
+};
+
+int pamu_domain_init()
+{
+	int ret = 0;
+
+	ret = iommu_init_mempool();
+	if (ret)
+		return ret;
+
+	bus_set_iommu(&platform_bus_type, &fsl_pamu_ops);
+	bus_set_iommu(&pci_bus_type, &fsl_pamu_ops);
+
+	return ret;
+}
diff --git a/drivers/iommu/fsl_pamu_domain.h b/drivers/iommu/fsl_pamu_domain.h
new file mode 100644
index 0000000..658ffc9
--- /dev/null
+++ b/drivers/iommu/fsl_pamu_domain.h
@@ -0,0 +1,89 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * Copyright (C) 2012 Freescale Semiconductor, Inc.
+ *
+ */
+
+#ifndef __FSL_PAMU_DOMAIN_H
+#define __FSL_PAMU_DOMAIN_H
+
+#include "fsl_pamu.h"
+
+struct dma_window {
+	phys_addr_t paddr;
+	u64 size;
+	int valid;
+	int prot;
+};
+
+struct fsl_dma_domain {
+	/* 
+	 * Indicates the geometry size for the domain.
+	 * This would be set when the geometry is
+	 * configured for the domain.
+	 */
+	dma_addr_t			geom_size;
+	/* 
+	 * Number of windows assocaited with this domain.
+	 * During domain initialization, it is set to the
+	 * the maximum number of subwindows allowed for a LIODN.
+	 * Minimum value for this is 1 indicating a single PAMU
+	 * window, without any sub windows. Value can be set/
+	 * queried by set_attr/get_attr API for DOMAIN_ATTR_WINDOWS.
+	 * Value can only be set once the geometry has been configured.
+	 */
+	u32				win_cnt;
+	/*
+	 * win_arr contains information of the configured
+	 * windows for a domain. This is allocated only
+	 * when the number of windows for the domain are
+	 * set. 
+	 */
+	struct dma_window		*win_arr;
+	/* list of devices associated with the domain */
+	struct list_head 		devices;
+	/* dma_domain states:
+	 * mapped - A particular mapping has been created
+	 * within the configured geometry.
+	 * enabled - DMA has been enabled for the given
+	 * domain. This translates to setting of the
+	 * valid bit for the primary PAACE in the PAMU
+	 * PAACT table. Domain geometry should be set and
+	 * it must have a valid mapping before DMA can be
+	 * enabled for it.
+	 *
+	 */
+	int				mapped;
+	int				enabled;
+	/* stash_id obtained from the stash attribute details */
+	u32				stash_id;
+	struct iommu_stash_attribute	dma_stash;
+	u32				snoop_id;
+	struct iommu_domain		*iommu_domain;
+	spinlock_t			domain_lock;
+};
+
+/* domain-device relationship */
+struct device_domain_info {
+	struct list_head link;	/* link to domain siblings */
+	struct device *dev;
+	u32 liodn;
+	struct fsl_dma_domain *domain; /* pointer to domain */
+};
+
+extern unsigned int max_liodn;
+extern unsigned int max_subwindow_count;
+
+#endif  /* __FSL_PAMU_DOMAIN_H */
-- 
1.7.4.1

Re: [PATCH 6/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU API implementation.

[Diana Craciun]

On 02/18/2013 02:52 PM, Varun Sethi wrote:
> +
> +#define PAACE_TCEF_FORMAT0_8B   0x00
> +#define PAACE_TCEF_FORMAT1_RSVD 0x01
> +
> +#define PAACE_NUMBER_ENTRIES    0x1FF

Where is this number coming from?

Diana

RE: [PATCH 6/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU API implementation.

[Sethi Varun-B16395]

> -----Original Message-----
> From: Craciun Diana Madalina-STFD002
> Sent: Tuesday, February 19, 2013 3:34 PM
> To: Sethi Varun-B16395
> Cc: iommu@lists.linux-foundation.org; linuxppc-dev@lists.ozlabs.org;
> linux-kernel@vger.kernel.org; Wood Scott-B07421; joro@8bytes.org; Yoder
> Stuart-B08248
> Subject: Re: [PATCH 6/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU
> API implementation.
> 
> On 02/18/2013 02:52 PM, Varun Sethi wrote:
> > +
> > +#define PAACE_TCEF_FORMAT0_8B   0x00
> > +#define PAACE_TCEF_FORMAT1_RSVD 0x01
> > +
> > +#define PAACE_NUMBER_ENTRIES    0x1FF
> 
> Where is this number coming from?
> 
This is currently hard coded. We will not require these many entries once we implement the LIODN allocation scheme.

-Varun

Re: [PATCH 6/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU API implementation.

[Diana Craciun]

On 02/18/2013 02:52 PM, Varun Sethi wrote:
> +/**
> + * pamu_get_ppaace() - Return the primary PACCE
> + * @liodn: liodn PAACT index for desired PAACE
> + *
> + * Returns the ppace pointer upon success else return
> + * null.
> + */
> +static struct paace *pamu_get_ppaace(int liodn)
> +{
> +	if (!ppaact || liodn > PAACE_NUMBER_ENTRIES) {

Shouldn't be "liodn >= PAACE_NUMBER_ENTRIES" ?

> +		pr_err("PPAACT doesn't exist\n");
> +		return NULL;
> +	}
> +
> +	return &ppaact[liodn];
> +}
> +

Diana

RE: [PATCH 6/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU API implementation.

[Sethi Varun-B16395]

> -----Original Message-----
> From: Craciun Diana Madalina-STFD002
> Sent: Tuesday, February 19, 2013 9:30 PM
> To: Sethi Varun-B16395
> Cc: iommu@lists.linux-foundation.org; linuxppc-dev@lists.ozlabs.org;
> linux-kernel@vger.kernel.org; Wood Scott-B07421; joro@8bytes.org; Yoder
> Stuart-B08248
> Subject: Re: [PATCH 6/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU
> API implementation.
> 
> On 02/18/2013 02:52 PM, Varun Sethi wrote:
> > +/**
> > + * pamu_get_ppaace() - Return the primary PACCE
> > + * @liodn: liodn PAACT index for desired PAACE
> > + *
> > + * Returns the ppace pointer upon success else return
> > + * null.
> > + */
> > +static struct paace *pamu_get_ppaace(int liodn) {
> > +	if (!ppaact || liodn > PAACE_NUMBER_ENTRIES) {
> 
> Shouldn't be "liodn >= PAACE_NUMBER_ENTRIES" ?
Yes, will fix this.

-Varun

Re: [PATCH 6/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU API implementation.

[Stuart Yoder]

Have not got through the entire file, but have a few comments...

+/*
+ * Set the PAACE type as primary and set the coherency required domain
+ * attribute
+ */
+static void pamu_setup_default_xfer_to_host_ppaace(struct paace *ppaace)
+{
+       set_bf(ppaace->addr_bitfields, PAACE_AF_PT, PAACE_PT_PRIMARY);
+
+       set_bf(ppaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
+              PAACE_M_COHERENCE_REQ);
+}
+
+/*
+ * Set the PAACE type as secondary and set the coherency required domain
+ * attribute.
+ */
+static void pamu_setup_default_xfer_to_host_spaace(struct paace *spaace)
+{
+       set_bf(spaace->addr_bitfields, PAACE_AF_PT, PAACE_PT_SECONDARY);
+       set_bf(spaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
+              PAACE_M_COHERENCE_REQ);
+}

Can we change the names of the above functions...   I know there is some history
with the name, but "xfer_to_host" is confusing.

Maybe just call them:

pamu_init_paace()
pamu_init_spaace()

> +/**
> + * pamu_config_spaace() - Sets up SPAACE entry for specified subwindow
> + *
> + * @liodn:  Logical IO device number
> + * @subwin_cnt:  number of sub-windows associated with dma-window
> + * @subwin_addr: starting address of subwindow
> + * @subwin_size: size of subwindow
> + * @omi: Operation mapping index
> + * @rpn: real (true physical) page number
> + * @snoopid: snoop id for hardware coherency -- if ~snoopid == 0 then
> + *                       snoopid not defined
> + * @stashid: cache stash id for associated cpu
> + * @enable: enable/disable subwindow after reconfiguration
> + * @prot: sub window permissions
> + *
> + * Returns 0 upon success else error code < 0 returned
> + */
> +int pamu_config_spaace(int liodn, u32 subwin_cnt, u32 subwin_addr,
> +                      phys_addr_t subwin_size, u32 omi, unsigned long rpn,
> +                      u32 snoopid, u32 stashid, int enable, int prot)
> +{
> +       struct paace *paace;
> +
> +       /* setup sub-windows */
> +       if (!subwin_cnt) {
> +               pr_err("Invalid subwindow count\n");
> +               return -EINVAL;
> +       }
> +
> +       paace = pamu_get_ppaace(liodn);
> +       if (subwin_addr > 0 && subwin_addr < subwin_cnt && paace) {

Why is the comparison subwin_addr < subwin_cnt?   Seems wrong...

> +               paace = pamu_get_spaace(paace, subwin_addr - 1);
> +
> +               if (paace && !(paace->addr_bitfields & PAACE_V_VALID)) {
> +                       pamu_setup_default_xfer_to_host_spaace(paace);
> +                       set_bf(paace->addr_bitfields, SPAACE_AF_LIODN, liodn);
> +               }
> +       }
> +
> +       if (!paace) {
> +               pr_err("Invalid liodn entry\n");
> +               return -ENOENT;
> +       }
> +
> +       if (!enable && prot == PAACE_AP_PERMS_DENIED) {
> +               if (subwin_addr > 0)
> +                       set_bf(paace->addr_bitfields, PAACE_AF_V,
> +                                PAACE_V_INVALID);
> +               else
> +                       set_bf(paace->addr_bitfields, PAACE_AF_AP,
> +                                prot);
> +               mb();
> +               return 0;
> +       }

Can you add a comment to the above if statement...when is this function called
with PAACE_AP_PERMS_DENIED?


> +       if (subwin_size & (subwin_size - 1) || subwin_size < PAMU_PAGE_SIZE) {
> +               pr_err("subwindow size out of range, or not a power of 2\n");
> +               return -EINVAL;
> +       }
> +
> +       if (rpn == ULONG_MAX) {
> +               pr_err("real page number out of range\n");
> +               return -EINVAL;
> +       }
> +
> +       /* window size is 2^(WSE+1) bytes */
> +       set_bf(paace->win_bitfields, PAACE_WIN_SWSE,
> +              map_addrspace_size_to_wse(subwin_size));
> +
> +       set_bf(paace->impl_attr, PAACE_IA_ATM, PAACE_ATM_WINDOW_XLATE);
> +       paace->twbah = rpn >> 20;
> +       set_bf(paace->win_bitfields, PAACE_WIN_TWBAL, rpn);
> +       set_bf(paace->addr_bitfields, PAACE_AF_AP, prot);
> +
> +       /* configure snoop id */
> +       if (~snoopid != 0)
> +               paace->domain_attr.to_host.snpid = snoopid;
> +
> +       /* set up operation mapping if it's configured */
> +       if (omi < OME_NUMBER_ENTRIES) {
> +               set_bf(paace->impl_attr, PAACE_IA_OTM, PAACE_OTM_INDEXED);
> +               paace->op_encode.index_ot.omi = omi;
> +       } else if (~omi != 0) {
> +               pr_err("bad operation mapping index: %d\n", omi);
> +               return -EINVAL;
> +       }
> +
> +       if (~stashid != 0)
> +               set_bf(paace->impl_attr, PAACE_IA_CID, stashid);
> +
> +       smp_wmb();
> +
> +       if (enable)
> +               paace->addr_bitfields |= PAACE_V_VALID;
> +
> +       mb();
> +
> +       return 0;
> +}

RE: [PATCH 6/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU API implementation.

[Sethi Varun-B16395]

> -----Original Message-----
> From: Stuart Yoder [mailto:b08248@gmail.com]
> Sent: Wednesday, February 27, 2013 4:03 AM
> To: Sethi Varun-B16395
> Cc: iommu@lists.linux-foundation.org; linuxppc-dev@lists.ozlabs.org;
> linux-kernel@vger.kernel.org; Wood Scott-B07421; Joerg Roedel; Yoder
> Stuart-B08248
> Subject: Re: [PATCH 6/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU
> API implementation.
> 
> Have not got through the entire file, but have a few comments...
> 
> +/*
> + * Set the PAACE type as primary and set the coherency required domain
> + * attribute
> + */
> +static void pamu_setup_default_xfer_to_host_ppaace(struct paace
> +*ppaace) {
> +       set_bf(ppaace->addr_bitfields, PAACE_AF_PT, PAACE_PT_PRIMARY);
> +
> +       set_bf(ppaace->domain_attr.to_host.coherency_required,
> PAACE_DA_HOST_CR,
> +              PAACE_M_COHERENCE_REQ);
> +}
> +
> +/*
> + * Set the PAACE type as secondary and set the coherency required
> +domain
> + * attribute.
> + */
> +static void pamu_setup_default_xfer_to_host_spaace(struct paace
> +*spaace) {
> +       set_bf(spaace->addr_bitfields, PAACE_AF_PT, PAACE_PT_SECONDARY);
> +       set_bf(spaace->domain_attr.to_host.coherency_required,
> PAACE_DA_HOST_CR,
> +              PAACE_M_COHERENCE_REQ);
> +}
> 
> Can we change the names of the above functions...   I know there is some
> history
> with the name, but "xfer_to_host" is confusing.
> 
> Maybe just call them:
> 
> pamu_init_paace()
> pamu_init_spaace()
> 
[Sethi Varun-B16395] ok, will change the function names.

> > +/**
> > + * pamu_config_spaace() - Sets up SPAACE entry for specified
> > +subwindow
> > + *
> > + * @liodn:  Logical IO device number
> > + * @subwin_cnt:  number of sub-windows associated with dma-window
> > + * @subwin_addr: starting address of subwindow
> > + * @subwin_size: size of subwindow
> > + * @omi: Operation mapping index
> > + * @rpn: real (true physical) page number
> > + * @snoopid: snoop id for hardware coherency -- if ~snoopid == 0 then
> > + *                       snoopid not defined
> > + * @stashid: cache stash id for associated cpu
> > + * @enable: enable/disable subwindow after reconfiguration
> > + * @prot: sub window permissions
> > + *
> > + * Returns 0 upon success else error code < 0 returned  */ int
> > +pamu_config_spaace(int liodn, u32 subwin_cnt, u32 subwin_addr,
> > +                      phys_addr_t subwin_size, u32 omi, unsigned long
> rpn,
> > +                      u32 snoopid, u32 stashid, int enable, int prot)
> > +{
> > +       struct paace *paace;
> > +
> > +       /* setup sub-windows */
> > +       if (!subwin_cnt) {
> > +               pr_err("Invalid subwindow count\n");
> > +               return -EINVAL;
> > +       }
> > +
> > +       paace = pamu_get_ppaace(liodn);
> > +       if (subwin_addr > 0 && subwin_addr < subwin_cnt && paace) {
> 
> Why is the comparison subwin_addr < subwin_cnt?   Seems wrong...
> 
[Sethi Varun-B16395] It's actually the subwindow index. I will rename the variable.

> > +               paace = pamu_get_spaace(paace, subwin_addr - 1);
> > +
> > +               if (paace && !(paace->addr_bitfields & PAACE_V_VALID))
> {
> > +                       pamu_setup_default_xfer_to_host_spaace(paace);
> > +                       set_bf(paace->addr_bitfields, SPAACE_AF_LIODN,
> liodn);
> > +               }
> > +       }
> > +
> > +       if (!paace) {
> > +               pr_err("Invalid liodn entry\n");
> > +               return -ENOENT;
> > +       }
> > +
> > +       if (!enable && prot == PAACE_AP_PERMS_DENIED) {
> > +               if (subwin_addr > 0)
> > +                       set_bf(paace->addr_bitfields, PAACE_AF_V,
> > +                                PAACE_V_INVALID);
> > +               else
> > +                       set_bf(paace->addr_bitfields, PAACE_AF_AP,
> > +                                prot);
> > +               mb();
> > +               return 0;
> > +       }
> 
> Can you add a comment to the above if statement...when is this function
> called with PAACE_AP_PERMS_DENIED?
> 
[Sethi Varun-B16395] Actually, this piece of code is redundant in case of the window based API. I will remove this. PAACE_AP_PERMS_DENIED is primarily used for disabling the primary subwindow.

-Varun

Re: [PATCH 6/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU API implementation.

[Stuart Yoder]

Some more comments...

On Mon, Feb 18, 2013 at 6:52 AM, Varun Sethi <Varun.Sethi@freescale.com> wrote:
> +/* Handling access violations */
> +#define make64(high, low) (((u64)(high) << 32) | (low))
> +
> +struct pamu_isr_data {
> +       void __iomem *pamu_reg_base;    /* Base address of PAMU regs*/
> +       unsigned int count;             /* The number of PAMUs */
> +};
> +
> +static struct paace *ppaact;
> +static struct paace *spaact;
> +static struct ome *omt;
> +
> +/* maximum subwindows permitted per liodn */
> +unsigned int max_subwindow_count;
> +/* Number of SPAACT entries */
> +unsigned long max_subwins;

I don't like that these variables are not static... and they are
referenced directly
from code in fsl_pamu_domain.c.  It would be better if fsl_pamu_domain.c
called an accessor function-- like pamu_get_max_subwins.

> +/* Pool for fspi allocation */
> +struct gen_pool *spaace_pool;

spaace_pool should be static?

I'm wondering if you should change pamu_isr_data into a more
general struct analagous to struct intel_iommu.   You could
put in there the max # of subwins, etc.   You could then
provide an accessor to get at that data.

[cut]
> +/**
> + * pamu_get_fspi_and_allocate() - Allocates fspi index and reserves subwindows
> + *                                required for primary PAACE in the secondary
> + *                                PAACE table.
> + * @subwin_cnt: Number of subwindows to be reserved.
> + *
> + * A PPAACE entry may have a number of associated subwindows. A subwindow
> + * corresponds to a SPAACE entry in the SPAACT table. Each PAACE entry stores
> + * the index (fspi) of the first SPAACE entry in the SPAACT table. This
> + * function returns the index of the first SPAACE entry. The remaining
> + * SPAACE entries are reserved contiguously from that index.
> + *
> + * Returns a valid fspi index in the range of 0 - max_subwins on success.
> + * If no SPAACE entry is available or the allocator can not reserve the required
> + * number of contiguous entries function returns ULONG_MAX indicating a failure.
> + *
> +*/
> +static unsigned long pamu_get_fspi_and_allocate(u32 subwin_cnt)
> +{
> +       unsigned long spaace_addr;
> +
> +       spaace_addr = gen_pool_alloc(spaace_pool, subwin_cnt * sizeof(struct paace));
> +       if (!spaace_addr)
> +               return ULONG_MAX;
> +
> +       return (spaace_addr - (unsigned long)spaact) / (sizeof(struct paace));
> +}

In order to keep things symmetric (with the free function) can we just
call the above
function:

   pamu_alloc_subwins()

> +/* Release the subwindows reserved for a particular LIODN */
> +void pamu_free_subwins(int liodn)
> +{
> +       struct paace *ppaace;
> +       u32 subwin_cnt, size;
> +
> +       ppaace = pamu_get_ppaace(liodn);
> +       if (!ppaace) {
> +               pr_err("Invalid liodn entry\n");
> +               return;
> +       }
> +
> +       if (get_bf(ppaace->addr_bitfields, PPAACE_AF_MW)) {
> +               subwin_cnt = 1UL << (get_bf(ppaace->impl_attr, PAACE_IA_WCE) + 1);
> +               size = (subwin_cnt - 1) * sizeof(struct paace);
> +               gen_pool_free(spaace_pool, (unsigned long)&spaact[ppaace->fspi], size);
> +               set_bf(ppaace->addr_bitfields, PPAACE_AF_MW, 0);
> +       }
> +}

[cut]

> +/**
> + * get_stash_id - Returns stash destination id corresponding to a
> + *                cache type and vcpu.
> + * @stash_dest_hint: L1, L2 or L3
> + * @vcpu: vpcu target for a particular cache type.
> + *
> + * Returs stash on success or ~(u32)0 on failure.
> + *
> + */
> +u32 get_stash_id(u32 stash_dest_hint, u32 vcpu)
> +{

The stash dest is really not a hint, right?  It's the requested stash
destination.  So maybe just drop 'hint' from the name.

The CPU here is really a physical CPU number and has nothing to do
with vcpus I think.  vcpu implies the index is inside a virtual machine...but
this API is generic and may or may not be used with KVM.

> +
> +/*
> + * Get the maximum number of PAACT table entries
> + * and subwindows supported by PAMU
> + */
> +static void get_pamu_cap_values(unsigned long pamu_reg_base)
> +{
> +       u32 pc_val;
> +
> +       pc_val = in_be32((u32 *)(pamu_reg_base + PAMU_PC3));
> +       /* Maximum number of subwindows per liodn */
> +       max_subwindow_count = 1 << (1 + PAMU_PC3_MWCE(pc_val));
> +       /* Total number of SPACCT entries */
> +       max_subwins = PAACE_NUMBER_ENTRIES * max_subwindow_count;
> +}

If you follow the suggestion at the top of this file, this function
would become something like--  init_pamu_capabilities().   And then
create an accessor function to access max subwins, etc.

Also, BTW, I don't see any support for the DOMAIN_ATTR_WINDOWS
attribute in your patch.  Was that coming in a later patch?

[cut

> +static int __init fsl_pamu_probe(struct platform_device *pdev)
> +{
> +       void __iomem *pamu_regs = NULL;
> +       struct ccsr_guts __iomem *guts_regs = NULL;
> +       u32 pamubypenr, pamu_counter;
> +       unsigned long pamu_reg_off;
> +       unsigned long pamu_reg_base;
> +       struct pamu_isr_data *data;
> +       struct device_node *guts_node;
> +       u64 size;
> +       struct page *p;
> +       int ret = 0;
> +       int irq;
> +       phys_addr_t ppaact_phys;
> +       phys_addr_t spaact_phys;
> +       phys_addr_t omt_phys;
> +       size_t mem_size = 0;
> +       unsigned int order = 0;
> +       u32 csd_port_id = 0;
> +       unsigned i;
> +       /*
> +        * enumerate all PAMUs and allocate and setup PAMU tables
> +        * for each of them,
> +        * NOTE : All PAMUs share the same LIODN tables.
> +        */
> +
> +       pamu_regs = of_iomap(pdev->dev.of_node, 0);
> +       if (!pamu_regs) {
> +               dev_err(&pdev->dev, "ioremap of PAMU node failed\n");
> +               return -ENOMEM;

Any reason not to be consistent with the other error handling-- set ret and
goto error"?

> +       }
> +       of_get_address(pdev->dev.of_node, 0, &size, NULL);
> +
> +       irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
> +       if (irq == NO_IRQ) {
> +               dev_warn(&pdev->dev, "no interrupts listed in PAMU node\n");
> +               goto error;
> +       }
> +
> +       data = kzalloc(sizeof(struct pamu_isr_data), GFP_KERNEL);
> +       if (!data) {
> +               iounmap(pamu_regs);
> +               return -ENOMEM;

Any reason not to be consistent with the other error handling-- set ret and
goto error"?


Stuart

Re: [PATCH 6/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU API implementation.

[Stuart Yoder]

On Mon, Feb 18, 2013 at 6:52 AM, Varun Sethi <Varun.Sethi@freescale.com> wrote:
[cut]
> +static phys_addr_t get_phys_addr(struct fsl_dma_domain *dma_domain, unsigned long iova)
> +{
> +       u32 win_cnt = dma_domain->win_cnt;
> +       struct dma_window *win_ptr =
> +                               &dma_domain->win_arr[0];
> +       struct iommu_domain_geometry *geom;
> +
> +       geom = &dma_domain->iommu_domain->geometry;
> +
> +       if (!win_cnt || !dma_domain->geom_size) {
> +               pr_err("Number of windows/geometry not configured for the domain\n");
> +               return 0;
> +       }
> +
> +       if (win_cnt > 1) {
> +               u64 subwin_size;
> +               unsigned long subwin_iova;
> +               u32 wnd;
> +
> +               subwin_size = dma_domain->geom_size >> ilog2(win_cnt);

Could it be just geom_size / win_cnt ??

> +               subwin_iova = iova & ~(subwin_size - 1);
> +               wnd = (subwin_iova - geom->aperture_start) >> ilog2(subwin_size);
> +               win_ptr = &dma_domain->win_arr[wnd];
> +       }
> +
> +       if (win_ptr->valid)
> +               return (win_ptr->paddr + (iova & (win_ptr->size - 1)));
> +
> +       return 0;
> +}
> +
> +static int map_liodn_subwins(int liodn, struct fsl_dma_domain *dma_domain)

Just call it map_subwins().  They are just sub windows, not "liodn sub windows".

[cut]

> +static int map_liodn_win(int liodn, struct fsl_dma_domain *dma_domain)

Call it map_win().

[cut]
> +static struct fsl_dma_domain *iommu_alloc_dma_domain(void)
> +{
> +       struct fsl_dma_domain *domain;
> +
> +       domain = kmem_cache_zalloc(fsl_pamu_domain_cache, GFP_KERNEL);
> +       if (!domain)
> +               return NULL;
> +
> +       domain->stash_id = ~(u32)0;
> +       domain->snoop_id = ~(u32)0;
> +       domain->win_cnt = max_subwindow_count;

To align with my previous comments on fsl_pamu.c, I think instead of referencing
a global variable (in fsl_pamu.c) you should be making an accessor API
call here to get
the max subwindow _count.

> +       domain->geom_size = 0;
> +
> +       INIT_LIST_HEAD(&domain->devices);
> +
> +       spin_lock_init(&domain->domain_lock);
> +
> +       return domain;
> +}
> +
> +static inline struct device_domain_info *find_domain(struct device *dev)
> +{
> +       return dev->archdata.iommu_domain;
> +}
> +
> +static void remove_domain_ref(struct device_domain_info *info, u32 win_cnt)
> +{
> +               list_del(&info->link);
> +               spin_lock(&iommu_lock);
> +               if (win_cnt)
> +                       pamu_free_subwins(info->liodn);
> +               pamu_disable_liodn(info->liodn);
> +               spin_unlock(&iommu_lock);
> +               spin_lock(&device_domain_lock);
> +               info->dev->archdata.iommu_domain = NULL;
> +               kmem_cache_free(iommu_devinfo_cache, info);
> +               spin_unlock(&device_domain_lock);
> +}

The above function is literally removing the _device_ reference from the domain.
The name implies that it is removing a "domain reference".   Suggestion is
to call it "remove_device_ref".

Also, the whitespace is messed up there.  You have 2 tabs instead of 1.

> +static void destroy_domain(struct fsl_dma_domain *dma_domain)
> +{
> +       struct device_domain_info *info;
> +
> +       /* Dissociate all the devices from this domain */
> +       while (!list_empty(&dma_domain->devices)) {
> +               info = list_entry(dma_domain->devices.next,
> +                       struct device_domain_info, link);
> +               remove_domain_ref(info, dma_domain->win_cnt);
> +       }
> +}

This function is removing all devices from a domain...maybe to be
consistent with my
suggestion below on detach_domain(), call this detach_all_devices().
 We have 2 functions
doing almost the same thing....one detaches a single device, one
detaches all devices.
The current names "destroy_domain" and "detach_domain" are not as clear to me.

> +static void detach_domain(struct device *dev, struct fsl_dma_domain *dma_domain)
> +{
> +       struct device_domain_info *info;
> +       struct list_head *entry, *tmp;
> +       unsigned long flags;
> +
> +       spin_lock_irqsave(&dma_domain->domain_lock, flags);
> +       /* Remove the device from the domain device list */
> +       if (!list_empty(&dma_domain->devices)) {
> +               list_for_each_safe(entry, tmp, &dma_domain->devices) {
> +                       info = list_entry(entry, struct device_domain_info, link);
> +                       if (info->dev == dev)
> +                               remove_domain_ref(info, dma_domain->win_cnt);
> +               }
> +       }
> +       spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
> +}

This function is not "detaching a domain", but is detaching a device.
 Call it detach_device().

> +static void attach_domain(struct fsl_dma_domain *dma_domain, int liodn, struct device *dev)
> +{

Same thing here.   This is not attaching a domain, but attaching a
device.  Call it attach_device.

> +       struct device_domain_info *info, *old_domain_info;
> +
> +       spin_lock(&device_domain_lock);
> +       /*
> +        * Check here if the device is already attached to domain or not.
> +        * If the device is already attached to a domain detach it.
> +        */
> +       old_domain_info = find_domain(dev);
> +       if (old_domain_info && old_domain_info->domain != dma_domain) {
> +               spin_unlock(&device_domain_lock);
> +               detach_domain(dev, old_domain_info->domain);
> +               spin_lock(&device_domain_lock);
> +       }
> +
> +       info = kmem_cache_zalloc(iommu_devinfo_cache, GFP_KERNEL);
> +
> +       info->dev = dev;
> +       info->liodn = liodn;
> +       info->domain = dma_domain;
> +
> +       list_add(&info->link, &dma_domain->devices);
> +       /*
> +        * In case of devices with multiple LIODNs just store
> +        * the info for the first LIODN as all
> +        * LIODNs share the same domain
> +        */
> +       if (!old_domain_info)
> +               dev->archdata.iommu_domain = info;
> +       spin_unlock(&device_domain_lock);
> +
> +}
> +

[cut]
> +/* Configure geometry settings for all LIODNs associated with domain */
> +static int configure_domain(struct fsl_dma_domain *dma_domain,
> +                           struct iommu_domain_geometry *geom_attr,
> +                           u32 win_cnt)

This function is not configuring the iommu domain...which is a concept
in the Linux driver, it is taking the domain geometry and setting
up the PAMU tables for all LIODNs currently in the domain.

Maybe it would help if you used a prefix like "pamu" or "paact" to
identify functions that operate on the actual PAMU tables.

maybe:  pamu_set_domain_geometry()

> +{
> +       struct device_domain_info *info;
> +       int ret = 0;
> +
> +       if (!list_empty(&dma_domain->devices)) {
> +               list_for_each_entry(info, &dma_domain->devices, link) {
> +                       ret = configure_liodn(info->liodn, info->dev, dma_domain,
> +                                             geom_attr, win_cnt);

...and following the above naming convention, call this (?): pamu_set_liodn

> +                       if (ret)
> +                               break;
> +               }
> +       }
> +
> +       return ret;
> +}
> +

[cut]
> +static int fsl_pamu_window_enable(struct iommu_domain *domain, u32 wnd_nr,
> +                                 phys_addr_t paddr, u64 size, int iommu_prot)
> +{
> +       struct fsl_dma_domain *dma_domain = domain->priv;
> +       struct dma_window *wnd;
> +       int prot = 0;
> +       int ret;
> +       unsigned long flags;
> +       u64 win_size;
> +
> +       if (iommu_prot & IOMMU_READ)
> +               prot |= PAACE_AP_PERMS_QUERY;
> +       if (iommu_prot & IOMMU_WRITE)
> +               prot |= PAACE_AP_PERMS_UPDATE;
> +
> +       spin_lock_irqsave(&dma_domain->domain_lock, flags);
> +       if (!dma_domain->win_arr) {
> +               pr_err("Number of windows not configured\n");
> +               spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
> +               return -ENODEV;
> +       }
> +
> +       if (wnd_nr >= dma_domain->win_cnt) {
> +               pr_err("Invalid window index\n");
> +               spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
> +               return -EINVAL;
> +       }
> +
> +       win_size = dma_domain->geom_size >> ilog2(dma_domain->win_cnt);

Isn't size just geom_size / win_cnt.   Not sure why you do the ilog2()
and right shift...
We already validated that  win_cnt is power of 2 when it was set.

> +       if (size > win_size) {
> +               pr_err("Invalid window size \n");
> +               spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
> +               return -EINVAL;
> +       }
> +
> +       if (dma_domain->win_cnt == 1) {
> +               if (dma_domain->enabled) {
> +                       pr_err("Disable the window before updating the mapping\n");
> +                       spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
> +                       return -EBUSY;
> +               }
> +
> +               ret = check_size(size, domain->geometry.aperture_start);
> +               if (ret) {
> +                       pr_err("Aperture start not aligned to the size\n");
> +                       spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
> +                       return -EINVAL;
> +               }
> +       }

Why is win_cnt==1 a special case?    Would the geometry not have been verified
when it was originally set up?

Also, do you need a check here to verify if the geometry has been set.  Is it a
requirement to set the geometry prior to window enable?

> +       wnd = &dma_domain->win_arr[wnd_nr];
> +       if (!wnd->valid) {
> +               wnd->paddr = paddr;
> +               wnd->size = size;
> +               wnd->prot = prot;
> +
> +               ret = update_domain_mapping(dma_domain, wnd_nr);
> +               if (!ret) {
> +                       wnd->valid = 1;
> +                       dma_domain->mapped++;
> +               }
> +       } else {
> +               pr_err("Disable the window before updating the mapping\n");
> +               ret = -EBUSY;
> +       }
> +
> +       spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
> +
> +       return ret;
> +}
> +
> +/*

[cut]
> +static int fsl_pamu_attach_device(struct iommu_domain *domain,
> +                                 struct device *dev)
> +{
> +       struct fsl_dma_domain *dma_domain = domain->priv;
> +       const u32 *prop;
> +       u32 prop_cnt;
> +       int len, ret = 0;
> +       struct pci_dev *pdev = NULL;
> +       struct pci_controller *pci_ctl;
> +
> +       /*
> +        * Hack to make attach device work for the PCI devices. Simply assign the
> +        * the LIODN for the PCI controller to the PCI device.
> +        */

Instead of "Simply assign...", perhaps say instead:  Use the LIODN for the
PCI controller when attaching a PCI device.

> +       if (dev->bus == &pci_bus_type) {
> +               pdev = to_pci_dev(dev);
> +               pci_ctl = pci_bus_to_host(pdev->bus);
> +               /*
> +                * make dev point to pci controller device
> +                * so we can get the LIODN programmed by
> +                * u-boot;
> +                */
> +               dev = pci_ctl->parent;
> +       }
> +
> +       prop = of_get_property(dev->of_node, "fsl,liodn", &len);

suggestion: name "prop" to be "liodn" and "prop_cnt" to be "liodn_cnt".  That
will be more clear.

> +       if (prop) {
> +               prop_cnt = len / sizeof(u32);
> +               ret = handle_attach_device(dma_domain, dev,
> +                                        prop, prop_cnt);
> +       } else {
> +               pr_err("missing fsl,liodn property at %s\n",
> +                         dev->of_node->full_name);
> +                       ret = -EINVAL;
> +       }
> +
> +       return ret;
> +}
> +
> +static void fsl_pamu_detach_device(struct iommu_domain *domain,
> +                                     struct device *dev)
> +{
> +       struct fsl_dma_domain *dma_domain = domain->priv;
> +       const u32 *prop;
> +       int len;
> +       struct pci_dev *pdev = NULL;
> +       struct pci_controller *pci_ctl;
> +
> +       /*
> +        * Hack to make detach device work for the PCI devices. Simply assign the
> +        * the LIODN for the PCI controller to the PCI device.
> +        */
> +       if (dev->bus == &pci_bus_type) {
> +               pdev = to_pci_dev(dev);
> +               pci_ctl = pci_bus_to_host(pdev->bus);
> +               /*
> +                * make dev point to pci controller device
> +                * so we can get the LIODN programmed by
> +                * u-boot;
> +                */
> +               dev = pci_ctl->parent;
> +       }
> +
> +       prop = of_get_property(dev->of_node, "fsl,liodn", &len);
> +       if (prop)
> +               detach_domain(dev, dma_domain);
> +       else
> +               pr_err("missing fsl,liodn property at %s\n",
> +                         dev->of_node->full_name);
> +}

I understand why you need the LIODN when attaching, but why do you get it
in the detatch function.   You are not using "prop" here.

[cut]
> +static  bool check_pci_ctl_endpt_part(struct pci_controller *pci_ctl)
> +{
> +       u32 version;
> +
> +       /* Check the PCI controller version number by readding BRR1 register */
> +       version = in_be32(pci_ctl->cfg_addr + (PCI_FSL_BRR1 >> 2));
> +       version &= PCI_FSL_BRR1_VER;
> +       /* If PCI controller version is >= 0x204 we can partition endpoints*/
> +       if (version >= 0x204)
> +               return 1;
> +
> +       return 0;
> +}

Can we just use the compatible string here to identify the different
kinds of PCI
controllers?   Reading the actual device registers is ugly right now because
you are #defining the BRR1 stuff in a generic powerpc header.

> +static int fsl_pamu_add_device(struct device *dev)
> +{
> +       struct iommu_group *group = NULL;
> +       struct pci_dev *pdev;
> +       struct pci_dev *bridge, *dma_pdev = NULL;
> +       struct pci_controller *pci_ctl;
> +       int ret;
> +
> +       /*
> +        * For platform devices we allocate a separate group for
> +        * each of the devices.
> +        */
> +       if (dev->bus == &pci_bus_type) {
> +               bool pci_endpt_part;

That variable name is not clear, the abbreviations are not natural.  I
would just
call it pci_endpoint_partitioning.

> +               pdev = to_pci_dev(dev);
> +               /* Don't create device groups for virtual PCI bridges */
> +               if (pdev->subordinate)
> +                       return 0;
> +
> +               pci_ctl = pci_bus_to_host(pdev->bus);
> +               pci_endpt_part = check_pci_ctl_endpt_part(pci_ctl);
> +               /* We can partition PCIe devices so assign device group to the device */
> +               if (pci_endpt_part) {
> +                       bridge = pci_find_upstream_pcie_bridge(pdev);
> +                       if (bridge) {
> +                               if (pci_is_pcie(bridge))
> +                                       dma_pdev = pci_get_domain_bus_and_slot(
> +                                                               pci_domain_nr(pdev->bus),
> +                                                               bridge->subordinate->number, 0);
> +                               if (!dma_pdev)
> +                                       dma_pdev = pci_dev_get(bridge);
> +                       } else
> +                               dma_pdev = pci_dev_get(pdev);
> +                       /* Account for quirked devices */
> +                       swap_pci_ref(&dma_pdev, pci_get_dma_source(dma_pdev));
> +                       group = get_device_iommu_group(&pdev->dev);
> +                       pci_dev_put(pdev);
> +                       /*
> +                        * PCIe controller is not a paritionable entity
> +                        * free the controller device iommu_group.
> +                        */
> +                       if (pci_ctl->parent->iommu_group)
> +                               iommu_group_remove_device(pci_ctl->parent);
> +               } else {
> +                       /*
> +                        * All devices connected to the controller will share the
> +                        * PCI controllers device group. If this is the first
> +                        * device to be probed for the pci controller, copy the
> +                        * device group information from the PCI controller device
> +                        * node and remove the PCI controller iommu group.
> +                        * For subsequent devices, the iommu group information can
> +                        * be obtained from sibling devices (i.e. from the bus_devices
> +                        * link list).
> +                        */
> +                       if (pci_ctl->parent->iommu_group) {
> +                               group = get_device_iommu_group(pci_ctl->parent);
> +                               iommu_group_remove_device(pci_ctl->parent);
> +                       } else {
> +                               /* check if this is the first device on the bus*/
> +                               if (pdev->bus_list.next == pdev->bus_list.prev) {
> +                                       struct pci_bus *bus = pdev->bus->parent;
> +                                       int found = 0;
> +                                       /* Traverese the parent bus list to get
> +                                        * pdev & dev for the sibling device.
> +                                        */
> +                                       while (bus) {
> +                                               if (!list_empty(&bus->devices)) {
> +                                                       pdev = container_of(bus->devices.next,
> +                                                                struct pci_dev, bus_list);
> +                                                       group = iommu_group_get(&pdev->dev);
> +                                                       /*
> +                                                        * All devices should be associated with
> +                                                        * a group.
> +                                                        */
> +                                                       if (group)
> +                                                               found = 1;
> +                                                       break;
> +                                               } else
> +                                                       bus = bus->parent;
> +                                       }
> +                                       if (!found)
> +                                               dev_err(&pdev->dev, "Failed to allocate group for the device\n");
> +                               } else {
> +                                       /*
> +                                        * Get the pdev & dev for the sibling device
> +                                        */
> +                                       pdev = container_of(pdev->bus_list.prev, struct pci_dev, bus_list);
> +                                       group = iommu_group_get(&pdev->dev);
> +                               }
> +                       }
> +               }
> +       } else
> +               group = get_device_iommu_group(dev);
> +
> +       if (IS_ERR(group))
> +               return PTR_ERR(group);
> +
> +       ret = iommu_group_add_device(group, dev);
> +
> +       iommu_group_put(group);
> +       return ret;
> +}
> +

Regards,
Stuart

RE: [PATCH 6/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU API implementation.

[Sethi Varun-B16395]

> -----Original Message-----
> From: Stuart Yoder [mailto:b08248@gmail.com]
> Sent: Saturday, March 02, 2013 4:58 AM
> To: Sethi Varun-B16395
> Cc: iommu@lists.linux-foundation.org; linuxppc-dev@lists.ozlabs.org;
> linux-kernel@vger.kernel.org; Wood Scott-B07421; Joerg Roedel; Yoder
> Stuart-B08248
> Subject: Re: [PATCH 6/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU
> API implementation.
> 
> On Mon, Feb 18, 2013 at 6:52 AM, Varun Sethi <Varun.Sethi@freescale.com>
> wrote:
> [cut]
> > +static phys_addr_t get_phys_addr(struct fsl_dma_domain *dma_domain,
> > +unsigned long iova) {
> > +       u32 win_cnt = dma_domain->win_cnt;
> > +       struct dma_window *win_ptr =
> > +                               &dma_domain->win_arr[0];
> > +       struct iommu_domain_geometry *geom;
> > +
> > +       geom = &dma_domain->iommu_domain->geometry;
> > +
> > +       if (!win_cnt || !dma_domain->geom_size) {
> > +               pr_err("Number of windows/geometry not configured for
> the domain\n");
> > +               return 0;
> > +       }
> > +
> > +       if (win_cnt > 1) {
> > +               u64 subwin_size;
> > +               unsigned long subwin_iova;
> > +               u32 wnd;
> > +
> > +               subwin_size = dma_domain->geom_size >> ilog2(win_cnt);
> 
> Could it be just geom_size / win_cnt ??
[Sethi Varun-B16395] You would run in to linking issues with respect to u64 division on 32 bit kernels.

> 
> > +               subwin_iova = iova & ~(subwin_size - 1);
> > +               wnd = (subwin_iova - geom->aperture_start) >>
> ilog2(subwin_size);
> > +               win_ptr = &dma_domain->win_arr[wnd];
> > +       }
> > +
> > +       if (win_ptr->valid)
> > +               return (win_ptr->paddr + (iova & (win_ptr->size -
> > + 1)));
> > +
> > +       return 0;
> > +}
> > +
> > +static int map_liodn_subwins(int liodn, struct fsl_dma_domain
> > +*dma_domain)
> 
> Just call it map_subwins().  They are just sub windows, not "liodn sub
> windows".
> 
[Sethi Varun-B16395] This would be called per liodn.

> [cut]
> 
> > +static int map_liodn_win(int liodn, struct fsl_dma_domain
> > +*dma_domain)
> 
> Call it map_win().
[Sethi Varun-B16395] This would again be called per liodn.

> 
> [cut]
> > +static struct fsl_dma_domain *iommu_alloc_dma_domain(void) {
> > +       struct fsl_dma_domain *domain;
> > +
> > +       domain = kmem_cache_zalloc(fsl_pamu_domain_cache, GFP_KERNEL);
> > +       if (!domain)
> > +               return NULL;
> > +
> > +       domain->stash_id = ~(u32)0;
> > +       domain->snoop_id = ~(u32)0;
> > +       domain->win_cnt = max_subwindow_count;
> 
> To align with my previous comments on fsl_pamu.c, I think instead of
> referencing a global variable (in fsl_pamu.c) you should be making an
> accessor API call here to get the max subwindow _count.
> 
[Sethi Varun-B16395] ok, I will make a accessor API call.

> > +       domain->geom_size = 0;
> > +
> > +       INIT_LIST_HEAD(&domain->devices);
> > +
> > +       spin_lock_init(&domain->domain_lock);
> > +
> > +       return domain;
> > +}
> > +
> > +static inline struct device_domain_info *find_domain(struct device
> > +*dev) {
> > +       return dev->archdata.iommu_domain; }
> > +
> > +static void remove_domain_ref(struct device_domain_info *info, u32
> > +win_cnt) {
> > +               list_del(&info->link);
> > +               spin_lock(&iommu_lock);
> > +               if (win_cnt)
> > +                       pamu_free_subwins(info->liodn);
> > +               pamu_disable_liodn(info->liodn);
> > +               spin_unlock(&iommu_lock);
> > +               spin_lock(&device_domain_lock);
> > +               info->dev->archdata.iommu_domain = NULL;
> > +               kmem_cache_free(iommu_devinfo_cache, info);
> > +               spin_unlock(&device_domain_lock); }
> 
> The above function is literally removing the _device_ reference from the
> domain.
> The name implies that it is removing a "domain reference".   Suggestion
> is
> to call it "remove_device_ref".
> 
> Also, the whitespace is messed up there.  You have 2 tabs instead of 1.
[Sethi Varun-B16395]  ok will make the change.
> 
> > +static void destroy_domain(struct fsl_dma_domain *dma_domain) {
> > +       struct device_domain_info *info;
> > +
> > +       /* Dissociate all the devices from this domain */
> > +       while (!list_empty(&dma_domain->devices)) {
> > +               info = list_entry(dma_domain->devices.next,
> > +                       struct device_domain_info, link);
> > +               remove_domain_ref(info, dma_domain->win_cnt);
> > +       }
> > +}
> 
> This function is removing all devices from a domain...maybe to be
> consistent with my suggestion below on detach_domain(), call this
> detach_all_devices().
>  We have 2 functions
> doing almost the same thing....one detaches a single device, one detaches
> all devices.
> The current names "destroy_domain" and "detach_domain" are not as clear
> to me.
> 
[Sethi Varun-B16395]ok 

> > +static void detach_domain(struct device *dev, struct fsl_dma_domain
> > +*dma_domain) {
> > +       struct device_domain_info *info;
> > +       struct list_head *entry, *tmp;
> > +       unsigned long flags;
> > +
> > +       spin_lock_irqsave(&dma_domain->domain_lock, flags);
> > +       /* Remove the device from the domain device list */
> > +       if (!list_empty(&dma_domain->devices)) {
> > +               list_for_each_safe(entry, tmp, &dma_domain->devices) {
> > +                       info = list_entry(entry, struct
> device_domain_info, link);
> > +                       if (info->dev == dev)
> > +                               remove_domain_ref(info, dma_domain-
> >win_cnt);
> > +               }
> > +       }
> > +       spin_unlock_irqrestore(&dma_domain->domain_lock, flags); }
> 
> This function is not "detaching a domain", but is detaching a device.
>  Call it detach_device().
> 
[Sethi Varun-B16395] ok, will address this.

> > +static void attach_domain(struct fsl_dma_domain *dma_domain, int
> > +liodn, struct device *dev) {
> 
> Same thing here.   This is not attaching a domain, but attaching a
> device.  Call it attach_device.
> 
[Sethi Varun-B16395] ok.

> > +       struct device_domain_info *info, *old_domain_info;
> > +
> > +       spin_lock(&device_domain_lock);
> > +       /*
> > +        * Check here if the device is already attached to domain or
> not.
> > +        * If the device is already attached to a domain detach it.
> > +        */
> > +       old_domain_info = find_domain(dev);
> > +       if (old_domain_info && old_domain_info->domain != dma_domain) {
> > +               spin_unlock(&device_domain_lock);
> > +               detach_domain(dev, old_domain_info->domain);
> > +               spin_lock(&device_domain_lock);
> > +       }
> > +
> > +       info = kmem_cache_zalloc(iommu_devinfo_cache, GFP_KERNEL);
> > +
> > +       info->dev = dev;
> > +       info->liodn = liodn;
> > +       info->domain = dma_domain;
> > +
> > +       list_add(&info->link, &dma_domain->devices);
> > +       /*
> > +        * In case of devices with multiple LIODNs just store
> > +        * the info for the first LIODN as all
> > +        * LIODNs share the same domain
> > +        */
> > +       if (!old_domain_info)
> > +               dev->archdata.iommu_domain = info;
> > +       spin_unlock(&device_domain_lock);
> > +
> > +}
> > +
> 
> [cut]
> > +/* Configure geometry settings for all LIODNs associated with domain
> > +*/ static int configure_domain(struct fsl_dma_domain *dma_domain,
> > +                           struct iommu_domain_geometry *geom_attr,
> > +                           u32 win_cnt)
> 
> This function is not configuring the iommu domain...which is a concept in
> the Linux driver, it is taking the domain geometry and setting up the
> PAMU tables for all LIODNs currently in the domain.
> 
> Maybe it would help if you used a prefix like "pamu" or "paact" to
> identify functions that operate on the actual PAMU tables.
> 
> maybe:  pamu_set_domain_geometry()
> 
[Sethi Varun-B16395] ok.
> > +{
> > +       struct device_domain_info *info;
> > +       int ret = 0;
> > +
> > +       if (!list_empty(&dma_domain->devices)) {
> > +               list_for_each_entry(info, &dma_domain->devices, link) {
> > +                       ret = configure_liodn(info->liodn, info->dev,
> dma_domain,
> > +                                             geom_attr, win_cnt);
> 
> ...and following the above naming convention, call this (?):
> pamu_set_liodn
[Sethi Varun-B16395] ok.

> 
> > +                       if (ret)
> > +                               break;
> > +               }
> > +       }
> > +
> > +       return ret;
> > +}
> > +
> 
> [cut]
> > +static int fsl_pamu_window_enable(struct iommu_domain *domain, u32
> wnd_nr,
> > +                                 phys_addr_t paddr, u64 size, int
> > +iommu_prot) {
> > +       struct fsl_dma_domain *dma_domain = domain->priv;
> > +       struct dma_window *wnd;
> > +       int prot = 0;
> > +       int ret;
> > +       unsigned long flags;
> > +       u64 win_size;
> > +
> > +       if (iommu_prot & IOMMU_READ)
> > +               prot |= PAACE_AP_PERMS_QUERY;
> > +       if (iommu_prot & IOMMU_WRITE)
> > +               prot |= PAACE_AP_PERMS_UPDATE;
> > +
> > +       spin_lock_irqsave(&dma_domain->domain_lock, flags);
> > +       if (!dma_domain->win_arr) {
> > +               pr_err("Number of windows not configured\n");
> > +               spin_unlock_irqrestore(&dma_domain->domain_lock,
> flags);
> > +               return -ENODEV;
> > +       }
> > +
> > +       if (wnd_nr >= dma_domain->win_cnt) {
> > +               pr_err("Invalid window index\n");
> > +               spin_unlock_irqrestore(&dma_domain->domain_lock,
> flags);
> > +               return -EINVAL;
> > +       }
> > +
> > +       win_size = dma_domain->geom_size >>
> > + ilog2(dma_domain->win_cnt);
> 
> Isn't size just geom_size / win_cnt.   Not sure why you do the ilog2()
> and right shift...
> We already validated that  win_cnt is power of 2 when it was set.
> 
[Sethi Varun-B16395] problem with u64 division.

> > +       if (size > win_size) {
> > +               pr_err("Invalid window size \n");
> > +               spin_unlock_irqrestore(&dma_domain->domain_lock,
> flags);
> > +               return -EINVAL;
> > +       }
> > +
> > +       if (dma_domain->win_cnt == 1) {
> > +               if (dma_domain->enabled) {
> > +                       pr_err("Disable the window before updating the
> mapping\n");
> > +                       spin_unlock_irqrestore(&dma_domain-
> >domain_lock, flags);
> > +                       return -EBUSY;
> > +               }
> > +
> > +               ret = check_size(size, domain-
> >geometry.aperture_start);
> > +               if (ret) {
> > +                       pr_err("Aperture start not aligned to the
> size\n");
> > +                       spin_unlock_irqrestore(&dma_domain-
> >domain_lock, flags);
> > +                       return -EINVAL;
> > +               }
> > +       }
> 
> Why is win_cnt==1 a special case?    Would the geometry not have been
> verified
> when it was originally set up?
> 
[Sethi Varun-B16395] Yes, but in case of a single window you can still have the flexibility of specifying a different size range. But the start address should still be aligned to the new size.
> Also, do you need a check here to verify if the geometry has been set.
> Is it a requirement to set the geometry prior to window enable?
[Sethi Varun-B16395] That is already checked with the subwindow array check.

> 
> > +       wnd = &dma_domain->win_arr[wnd_nr];
> > +       if (!wnd->valid) {
> > +               wnd->paddr = paddr;
> > +               wnd->size = size;
> > +               wnd->prot = prot;
> > +
> > +               ret = update_domain_mapping(dma_domain, wnd_nr);
> > +               if (!ret) {
> > +                       wnd->valid = 1;
> > +                       dma_domain->mapped++;
> > +               }
> > +       } else {
> > +               pr_err("Disable the window before updating the
> mapping\n");
> > +               ret = -EBUSY;
> > +       }
> > +
> > +       spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
> > +
> > +       return ret;
> > +}
> > +
> > +/*
> 
> [cut]
> > +static int fsl_pamu_attach_device(struct iommu_domain *domain,
> > +                                 struct device *dev) {
> > +       struct fsl_dma_domain *dma_domain = domain->priv;
> > +       const u32 *prop;
> > +       u32 prop_cnt;
> > +       int len, ret = 0;
> > +       struct pci_dev *pdev = NULL;
> > +       struct pci_controller *pci_ctl;
> > +
> > +       /*
> > +        * Hack to make attach device work for the PCI devices. Simply
> assign the
> > +        * the LIODN for the PCI controller to the PCI device.
> > +        */
> 
> Instead of "Simply assign...", perhaps say instead:  Use the LIODN for
> the PCI controller when attaching a PCI device.
[Sethi Varun-B16395] ok.

> 
> > +       if (dev->bus == &pci_bus_type) {
> > +               pdev = to_pci_dev(dev);
> > +               pci_ctl = pci_bus_to_host(pdev->bus);
> > +               /*
> > +                * make dev point to pci controller device
> > +                * so we can get the LIODN programmed by
> > +                * u-boot;
> > +                */
> > +               dev = pci_ctl->parent;
> > +       }
> > +
> > +       prop = of_get_property(dev->of_node, "fsl,liodn", &len);
> 
> suggestion: name "prop" to be "liodn" and "prop_cnt" to be "liodn_cnt".
> That will be more clear.
[Sethi Varun-B16395] ok.

> 
> > +       if (prop) {
> > +               prop_cnt = len / sizeof(u32);
> > +               ret = handle_attach_device(dma_domain, dev,
> > +                                        prop, prop_cnt);
> > +       } else {
> > +               pr_err("missing fsl,liodn property at %s\n",
> > +                         dev->of_node->full_name);
> > +                       ret = -EINVAL;
> > +       }
> > +
> > +       return ret;
> > +}
> > +
> > +static void fsl_pamu_detach_device(struct iommu_domain *domain,
> > +                                     struct device *dev) {
> > +       struct fsl_dma_domain *dma_domain = domain->priv;
> > +       const u32 *prop;
> > +       int len;
> > +       struct pci_dev *pdev = NULL;
> > +       struct pci_controller *pci_ctl;
> > +
> > +       /*
> > +        * Hack to make detach device work for the PCI devices. Simply
> assign the
> > +        * the LIODN for the PCI controller to the PCI device.
> > +        */
> > +       if (dev->bus == &pci_bus_type) {
> > +               pdev = to_pci_dev(dev);
> > +               pci_ctl = pci_bus_to_host(pdev->bus);
> > +               /*
> > +                * make dev point to pci controller device
> > +                * so we can get the LIODN programmed by
> > +                * u-boot;
> > +                */
> > +               dev = pci_ctl->parent;
> > +       }
> > +
> > +       prop = of_get_property(dev->of_node, "fsl,liodn", &len);
> > +       if (prop)
> > +               detach_domain(dev, dma_domain);
> > +       else
> > +               pr_err("missing fsl,liodn property at %s\n",
> > +                         dev->of_node->full_name); }
> 
> I understand why you need the LIODN when attaching, but why do you get it
> in the detatch function.   You are not using "prop" here.
[Sethi Varun-B16395] Just a sanity check.

> 
> [cut]
> > +static  bool check_pci_ctl_endpt_part(struct pci_controller *pci_ctl)
> > +{
> > +       u32 version;
> > +
> > +       /* Check the PCI controller version number by readding BRR1
> register */
> > +       version = in_be32(pci_ctl->cfg_addr + (PCI_FSL_BRR1 >> 2));
> > +       version &= PCI_FSL_BRR1_VER;
> > +       /* If PCI controller version is >= 0x204 we can partition
> endpoints*/
> > +       if (version >= 0x204)
> > +               return 1;
> > +
> > +       return 0;
> > +}
> 
> Can we just use the compatible string here to identify the different
> kinds of PCI
> controllers?   Reading the actual device registers is ugly right now
> because
> you are #defining the BRR1 stuff in a generic powerpc header.
> 
[Sethi Varun-B16395] hmmm......, I would have to check for various different compatible strings in that case. May be I can move the defines to a different file. What if I move them to some other header?

> > +static int fsl_pamu_add_device(struct device *dev) {
> > +       struct iommu_group *group = NULL;
> > +       struct pci_dev *pdev;
> > +       struct pci_dev *bridge, *dma_pdev = NULL;
> > +       struct pci_controller *pci_ctl;
> > +       int ret;
> > +
> > +       /*
> > +        * For platform devices we allocate a separate group for
> > +        * each of the devices.
> > +        */
> > +       if (dev->bus == &pci_bus_type) {
> > +               bool pci_endpt_part;
> 
> That variable name is not clear, the abbreviations are not natural.  I
> would just call it pci_endpoint_partitioning.
[Sethi Varun-B16395] ok.

-Varun

RE: [PATCH 6/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU API implementation.

[Yoder Stuart-B08248]

> -----Original Message-----
> From: Sethi Varun-B16395
> Sent: Monday, March 04, 2013 5:31 AM
> To: Stuart Yoder
> Cc: iommu@lists.linux-foundation.org; linuxppc-dev@lists.ozlabs.org; linux-kernel@vger.kernel.org; Wood
> Scott-B07421; Joerg Roedel; Yoder Stuart-B08248
> Subject: RE: [PATCH 6/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU API implementation.
> 
> 
> 
> > -----Original Message-----
> > From: Stuart Yoder [mailto:b08248@gmail.com]
> > Sent: Saturday, March 02, 2013 4:58 AM
> > To: Sethi Varun-B16395
> > Cc: iommu@lists.linux-foundation.org; linuxppc-dev@lists.ozlabs.org;
> > linux-kernel@vger.kernel.org; Wood Scott-B07421; Joerg Roedel; Yoder
> > Stuart-B08248
> > Subject: Re: [PATCH 6/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU
> > API implementation.
> >
> > On Mon, Feb 18, 2013 at 6:52 AM, Varun Sethi <Varun.Sethi@freescale.com>
> > wrote:
> > [cut]
> > > +static phys_addr_t get_phys_addr(struct fsl_dma_domain *dma_domain,
> > > +unsigned long iova) {
> > > +       u32 win_cnt = dma_domain->win_cnt;
> > > +       struct dma_window *win_ptr =
> > > +                               &dma_domain->win_arr[0];
> > > +       struct iommu_domain_geometry *geom;
> > > +
> > > +       geom = &dma_domain->iommu_domain->geometry;
> > > +
> > > +       if (!win_cnt || !dma_domain->geom_size) {
> > > +               pr_err("Number of windows/geometry not configured for
> > the domain\n");
> > > +               return 0;
> > > +       }
> > > +
> > > +       if (win_cnt > 1) {
> > > +               u64 subwin_size;
> > > +               unsigned long subwin_iova;
> > > +               u32 wnd;
> > > +
> > > +               subwin_size = dma_domain->geom_size >> ilog2(win_cnt);
> >
> > Could it be just geom_size / win_cnt ??
> [Sethi Varun-B16395] You would run in to linking issues with respect to u64 division on 32 bit kernels.
> 
> >
> > > +               subwin_iova = iova & ~(subwin_size - 1);
> > > +               wnd = (subwin_iova - geom->aperture_start) >>
> > ilog2(subwin_size);
> > > +               win_ptr = &dma_domain->win_arr[wnd];
> > > +       }
> > > +
> > > +       if (win_ptr->valid)
> > > +               return (win_ptr->paddr + (iova & (win_ptr->size -
> > > + 1)));
> > > +
> > > +       return 0;
> > > +}
> > > +
> > > +static int map_liodn_subwins(int liodn, struct fsl_dma_domain
> > > +*dma_domain)
> >
> > Just call it map_subwins().  They are just sub windows, not "liodn sub
> > windows".
> >
> [Sethi Varun-B16395] This would be called per liodn.
>
> > [cut]
> >
> > > +static int map_liodn_win(int liodn, struct fsl_dma_domain
> > > +*dma_domain)
> >
> > Call it map_win().
> [Sethi Varun-B16395] This would again be called per liodn.

On the function names-- function names are typically named
with a noun describing some object and a verb describing
the action...and sometimes a subsystem identifier:
    kmem_cache + zalloc
    spin + lock

I don't think inserting liodn in the function name to indicates that it 
operates per liodn makes it more clear and reads a little awkward to me:

    map + liodn_win

...it's almost like there is a "liodn_win" object.

I think plain map_win() is more clear and the function prototype makes
it pretty clear that you are operating on an liodn.
 
> > [cut]
> > > +static  bool check_pci_ctl_endpt_part(struct pci_controller *pci_ctl)
> > > +{
> > > +       u32 version;
> > > +
> > > +       /* Check the PCI controller version number by readding BRR1
> > register */
> > > +       version = in_be32(pci_ctl->cfg_addr + (PCI_FSL_BRR1 >> 2));
> > > +       version &= PCI_FSL_BRR1_VER;
> > > +       /* If PCI controller version is >= 0x204 we can partition
> > endpoints*/
> > > +       if (version >= 0x204)
> > > +               return 1;
> > > +
> > > +       return 0;
> > > +}
> >
> > Can we just use the compatible string here to identify the different
> > kinds of PCI
> > controllers?   Reading the actual device registers is ugly right now
> > because
> > you are #defining the BRR1 stuff in a generic powerpc header.
> >
> [Sethi Varun-B16395] hmmm......, I would have to check for various different compatible strings in that
> case. May be I can move the defines to a different file. What if I move them to some other header?

Don't personally feel too strongly about version register or header...but it should be some fsl
PCI header that you define those regs.

You'll either need to check for a hardware version number or a compatible,
so a compatible check may be just as easy...look for "fsl,qoriq-pcie-v2.4"?

Stuart

RE: [PATCH 0/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU API implementation.

[Sethi Varun-B16395]

Hi Joerg,
Do you have any comments on the patch set.

Regards
Varun

> -----Original Message-----
> From: Sethi Varun-B16395
> Sent: Monday, February 18, 2013 6:22 PM
> To: iommu@lists.linux-foundation.org; linuxppc-dev@lists.ozlabs.org;
> linux-kernel@vger.kernel.org; Wood Scott-B07421; joro@8bytes.org; Yoder
> Stuart-B08248
> Cc: Sethi Varun-B16395
> Subject: [PATCH 0/6 v8] iommu/fsl: Freescale PAMU driver and IOMMU API
> implementation.
> 
> This patchset provides the Freescale PAMU (Peripheral Access Management
> Unit) driver and the corresponding IOMMU API implementation. PAMU is the
> IOMMU present on Freescale QorIQ platforms. PAMU can authorize memory
> access, remap the memory address, and remap the I/O transaction type.
> 
> This set consists of the following patches:
> 1. Addition of new field in the device (powerpc) archdata structure for
> storing iommu domain information
>    pointer. This pointer is stored when the device is attached to a
> particular iommu domain.
> 2. Store PCI controller platform device information in the PCI controller
> structure.
> 3. Add defines for FSL PCI controller BRR1 register.
> 4. Add window permission flags in the iommu_domain_window_enable API.
> 5. Add domain attributes for FSL PAMU driver.
> 6. PAMU driver and IOMMU API implementation.
> 
> This patch set is based on the next branch of the iommu git tree
> maintained by Joerg.
> 
> Varun Sethi (6):
>   Store iommu domain information in the device structure.
>   Store the platform device information corresponding to the pci
>     controller.
>   Added defines for the FSL PCI controller BRR1 register.
>   Add window permission flags for iommu_domain_window_enable API.
>   Add addtional attributes specific to the PAMU driver.
>   FSL PAMU driver and IOMMU API implementation.
> 
>  arch/powerpc/include/asm/device.h     |    4 +
>  arch/powerpc/include/asm/pci-bridge.h |    4 +
>  arch/powerpc/sysdev/fsl_pci.c         |    9 +-
>  arch/powerpc/sysdev/fsl_pci.h         |    2 +-
>  drivers/iommu/Kconfig                 |    8 +
>  drivers/iommu/Makefile                |    1 +
>  drivers/iommu/fsl_pamu.c              | 1260
> +++++++++++++++++++++++++++++++++
>  drivers/iommu/fsl_pamu.h              |  398 +++++++++++
>  drivers/iommu/fsl_pamu_domain.c       | 1135
> +++++++++++++++++++++++++++++
>  drivers/iommu/fsl_pamu_domain.h       |   89 +++
>  drivers/iommu/iommu.c                 |    5 +-
>  include/linux/iommu.h                 |   40 +-
>  12 files changed, 2947 insertions(+), 8 deletions(-)  create mode 100644
> drivers/iommu/fsl_pamu.c  create mode 100644 drivers/iommu/fsl_pamu.h
> create mode 100644 drivers/iommu/fsl_pamu_domain.c  create mode 100644
> drivers/iommu/fsl_pamu_domain.h
> 
> --
> 1.7.4.1