Re: [PATCH 0/2] Automatically load the vmx_crypto module if supported

2016-07-12 Thread Alastair D'Silva
On Wed, 2016-07-13 at 15:47 +1000, alast...@au1.ibm.com wrote: > From: Alastair D'Silva <alast...@d-silva.org> > > This series allows the vmx_crypto module to be detected and > automatically > loaded via UDEV if the CPU supports the vector crypto feature. > > Alastair D'

[PATCH v3 3/7] powerpc: use task_pid_nr() for TID allocation

2018-05-08 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> The current implementation of TID allocation, using a global IDR, may result in an errant process starving the system of available TIDs. Instead, use task_pid_nr(), as mentioned by the original author. The scenario described which prevented it

[PATCH v3 0/7] ocxl: Implement Power9 as_notify/wait for OpenCAPI

2018-05-08 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> The Power 9 as_notify/wait feature provides a lower latency way to signal a thread that work is complete. This series enables the use of this feature from OpenCAPI adapters, as well as addressing a potential starvation issue when allocating thre

[PATCH v3 7/7] ocxl: Document new OCXL IOCTLs

2018-05-08 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- Documentation/accelerators/ocxl.rst | 11 +++ 1 file changed, 11 insertions(+) diff --git a/Documentation/accelerators/ocxl.rst b/Documentation/accelerators/oc

[PATCH v3 6/7] ocxl: Add an IOCTL so userspace knows what OCXL features are available

2018-05-08 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> In order for a userspace AFU driver to call the POWER9 specific OCXL_IOCTL_ENABLE_P9_WAIT, it needs to verify that it can actually make that call. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- drivers/misc/ocxl

[PATCH v3 5/7] ocxl: Expose the thread_id needed for wait on POWER9

2018-05-08 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> In order to successfully issue as_notify, an AFU needs to know the TID to notify, which in turn means that this information should be available in userspace so it can be communicated to the AFU. Signed-off-by: Alastair D'Silva <alast...@d-

[PATCH v3 2/7] powerpc: Use TIDR CPU feature to control TIDR allocation

2018-05-08 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> Switch the use of TIDR on it's CPU feature, rather than assuming it is available based on architecture. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- arch/powerpc/kernel/process.c | 6 +++--- 1 file changed, 3 insertions(+),

Re: [PATCH v2 3/7] powerpc: use task_pid_nr() for TID allocation

2018-05-07 Thread Alastair D'Silva
On Mon, 2018-05-07 at 19:37 +0200, Frederic Barrat wrote: > > Le 18/04/2018 à 03:08, Alastair D'Silva a écrit : > > From: Alastair D'Silva <alast...@d-silva.org> > > > > The current implementation of TID allocation, using a global IDR, > > may > > resul

Re: [PATCH v2 6/7] ocxl: Add an IOCTL so userspace knows what CPU features are available

2018-05-07 Thread Alastair D'Silva
On Mon, 2018-05-07 at 20:14 +0200, Frederic Barrat wrote: > > Le 18/04/2018 à 03:08, Alastair D'Silva a écrit : > > From: Alastair D'Silva <alast...@d-silva.org> > > > > In order for a userspace AFU driver to call the Power9 specific > > OCXL_IOCTL_ENABLE_P9_

Re: [PATCH v2 1/7] powerpc: Add TIDR CPU feature for Power9

2018-05-07 Thread Alastair D'Silva
On Mon, 2018-05-07 at 19:17 +0200, Frederic Barrat wrote: > > Le 18/04/2018 à 03:08, Alastair D'Silva a écrit : > > From: Alastair D'Silva <alast...@d-silva.org> > > > > This patch adds a CPU feature bit to show whether the CPU has > > the TIDR registe

Re: [PATCH v2 6/7] ocxl: Add an IOCTL so userspace knows what CPU features are available

2018-05-07 Thread Alastair D'Silva
On Tue, 2018-05-08 at 13:50 +1000, Nicholas Piggin wrote: > On Tue, 08 May 2018 10:41:55 +1000 > "Alastair D'Silva" <alast...@au1.ibm.com> wrote: > > > On Mon, 2018-05-07 at 20:14 +0200, Frederic Barrat wrote: > > > > > > Le 18/04/2018 à 03:08, Al

[PATCH v4 5/7] ocxl: Expose the thread_id needed for wait on POWER9

2018-05-08 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> In order to successfully issue as_notify, an AFU needs to know the TID to notify, which in turn means that this information should be available in userspace so it can be communicated to the AFU. Signed-off-by: Alastair D'Silva <alast...@d-

[PATCH v4 1/7] powerpc: Add TIDR CPU feature for POWER9

2018-05-08 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> This patch adds a CPU feature bit to show whether the CPU has the TIDR register available, enabling as_notify/wait in userspace. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- arch/powerpc/include/asm/cputable.h | 3 ++-

[PATCH v4 7/7] ocxl: Document new OCXL IOCTLs

2018-05-08 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- Documentation/accelerators/ocxl.rst | 11 +++ 1 file changed, 11 insertions(+) diff --git a/Documentation/accelerators/ocxl.rst b/Documentation/accelerators/oc

[PATCH v4 4/7] ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action

2018-05-08 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> The function removes the process element from NPU cache. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- arch/powerpc/include/asm/pnv-ocxl.h | 2 +- arch/powerpc/platforms/powernv/ocxl.c | 4 ++-- drivers/misc

[PATCH v4 0/7] ocxl: Implement Power9 as_notify/wait for OpenCAPI

2018-05-08 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> The Power 9 as_notify/wait feature provides a lower latency way to signal a thread that work is complete. This series enables the use of this feature from OpenCAPI adapters, as well as addressing a potential starvation issue when allocating thre

[PATCH v3 1/7] powerpc: Add TIDR CPU feature for POWER9

2018-05-08 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> This patch adds a CPU feature bit to show whether the CPU has the TIDR register available, enabling as_notify/wait in userspace. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- arch/powerpc/include/asm/cputable.h | 3 ++-

[PATCH v3 4/7] ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action

2018-05-08 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> The function removes the process element from NPU cache. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- arch/powerpc/include/asm/pnv-ocxl.h | 2 +- arch/powerpc/platforms/powernv/ocxl.c | 4 ++-- drivers/misc

[PATCH v4 6/7] ocxl: Add an IOCTL so userspace knows what OCXL features are available

2018-05-08 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> In order for a userspace AFU driver to call the POWER9 specific OCXL_IOCTL_ENABLE_P9_WAIT, it needs to verify that it can actually make that call. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- drivers/misc/ocxl

[PATCH v4 3/7] powerpc: use task_pid_nr() for TID allocation

2018-05-08 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> The current implementation of TID allocation, using a global IDR, may result in an errant process starving the system of available TIDs. Instead, use task_pid_nr(), as mentioned by the original author. The scenario described which prevented it

[PATCH v4 2/7] powerpc: Use TIDR CPU feature to control TIDR allocation

2018-05-08 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> Switch the use of TIDR on it's CPU feature, rather than assuming it is available based on architecture. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- arch/powerpc/kernel/process.c | 6 +++--- 1 file changed, 3 insertions(+),

[PATCH v5 7/7] ocxl: Document new OCXL IOCTLs

2018-05-11 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- Documentation/accelerators/ocxl.rst | 11 +++ 1 file changed, 11 insertions(+) diff --git a/Documentation/accelerators/ocxl.rst b/Documentation/accelerators/oc

[PATCH v5 6/7] ocxl: Add an IOCTL so userspace knows what OCXL features are available

2018-05-11 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> In order for a userspace AFU driver to call the POWER9 specific OCXL_IOCTL_ENABLE_P9_WAIT, it needs to verify that it can actually make that call. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- drivers/misc/ocxl

[PATCH v5 5/7] ocxl: Expose the thread_id needed for wait on POWER9

2018-05-11 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> In order to successfully issue as_notify, an AFU needs to know the TID to notify, which in turn means that this information should be available in userspace so it can be communicated to the AFU. Signed-off-by: Alastair D'Silva <alast...@d-

[PATCH v5 1/7] powerpc: Add TIDR CPU feature for POWER9

2018-05-11 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> This patch adds a CPU feature bit to show whether the CPU has the TIDR register available, enabling as_notify/wait in userspace. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- arch/powerpc/include/asm/cputable.h | 3 ++-

[PATCH v5 2/7] powerpc: Use TIDR CPU feature to control TIDR allocation

2018-05-11 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> Switch the use of TIDR on it's CPU feature, rather than assuming it is available based on architecture. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- arch/powerpc/kernel/process.c | 6 +++--- 1 file changed, 3 insertions(+),

[PATCH v5 3/7] powerpc: use task_pid_nr() for TID allocation

2018-05-11 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> The current implementation of TID allocation, using a global IDR, may result in an errant process starving the system of available TIDs. Instead, use task_pid_nr(), as mentioned by the original author. The scenario described which prevented it

[PATCH v5 0/7] ocxl: Implement Power9 as_notify/wait for OpenCAPI

2018-05-11 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> The Power 9 as_notify/wait feature provides a lower latency way to signal a thread that work is complete. This series enables the use of this feature from OpenCAPI adapters, as well as addressing a potential starvation issue when allocating thre

[PATCH v5 4/7] ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action

2018-05-11 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> The function removes the process element from NPU cache. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- arch/powerpc/include/asm/pnv-ocxl.h | 2 +- arch/powerpc/platforms/powernv/ocxl.c | 4 ++-- drivers/misc

RE: [PATCH v5 5/7] ocxl: Expose the thread_id needed for wait on POWER9

2018-05-11 Thread Alastair D'Silva
> -Original Message- > From: Frederic Barrat <fbar...@linux.ibm.com> > Sent: Friday, 11 May 2018 7:25 PM > To: Alastair D'Silva <alast...@au1.ibm.com>; linuxppc-...@lists.ozlabs.org > Cc: linux-kernel@vger.kernel.org; linux-...@vger.kernel.org

[PATCH] ocxl: Add get_metadata IOCTL to share OCXL information to userspace

2018-02-20 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> Some required information is not exposed to userspace currently (eg. the PASID), pass this information back, along with other information which is currently communicated via sysfs, which saves some parsing effort in userspace. Signed-off-by: Al

Re: [PATCH] ocxl: Add get_metadata IOCTL to share OCXL information to userspace

2018-02-21 Thread Alastair D'Silva
On Wed, 2018-02-21 at 12:25 +0100, Frederic Barrat wrote: > > Le 21/02/2018 à 07:43, Balbir Singh a écrit : > > On Wed, Feb 21, 2018 at 3:57 PM, Alastair D'Silva <alast...@au1.ibm > > .com> wrote: > > > From: Alastair D'Silva <alast...@d-silva.org>

[PATCH v2 0/2] Add get_metadata IOCTL to share OCXL information to userspace

2018-02-21 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> This series adds a new IOCTL for OpenCAPI, which exposes adapter metadata to userspace. --- v1->v2: - Document the new IOCTL Alastair D'Silva (2): ocxl: Add get_metadata IOCTL to share OCXL information to userspace ocxl:

[PATCH v2 1/2] ocxl: Add get_metadata IOCTL to share OCXL information to userspace

2018-02-21 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> Some required information is not exposed to userspace currently (eg. the PASID), pass this information back, along with other information which is currently communicated via sysfs, which saves some parsing effort in userspace. Signed-off-by: Al

[PATCH v2 2/2] ocxl: Document the OCXL_IOCTL_GET_METADATA IOCTL

2018-02-21 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- Documentation/accelerators/ocxl.rst | 5 + 1 file changed, 5 insertions(+) diff --git a/Documentation/accelerators/ocxl.rst b/Documentation/accelerators/ocxl.rst index

Re: [PATCH] ocxl: Add get_metadata IOCTL to share OCXL information to userspace

2018-02-21 Thread Alastair D'Silva
On Wed, 2018-02-21 at 17:43 +1100, Balbir Singh wrote: > On Wed, Feb 21, 2018 at 3:57 PM, Alastair D'Silva <alast...@au1.ibm.c > om> wrote: > > From: Alastair D'Silva <alast...@d-silva.org> > > > > Some required information is not exposed to userspace cur

Re: [PATCH] ocxl: Add get_metadata IOCTL to share OCXL information to userspace

2018-02-21 Thread Alastair D'Silva
On Thu, 2018-02-22 at 14:41 +1100, Balbir Singh wrote: > On Thu, Feb 22, 2018 at 10:32 AM, Alastair D'Silva <alast...@au1.ibm. > com> wrote: > > > > On Wed, 2018-02-21 at 17:43 +1100, Balbir Singh wrote: > > > On Wed, Feb 21, 2018 at 3:57 PM, Alastair D'Silva &l

Re: [PATCH] ocxl: Add get_metadata IOCTL to share OCXL information to userspace

2018-02-21 Thread Alastair D'Silva
t; there are a few ways around it, if we care about this combination. > > Balbir Singh. > We have a number of reserved members at the end of the struct which can be re-purposed for future information (with a corresponding bump of the version number). -- Alastair D'Silva Open Source Developer Linux Technology Centre, IBM Australia mob: 0423 762 819

[PATCH v3 0/2] Add get_metadata IOCTL to share OCXL information to userspace

2018-02-21 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> This series adds a new IOCTL for OpenCAPI, which exposes adapter metadata to userspace. --- v1->v2: - Document the new IOCTL v2->v3: - Rename metadata struct - Document a couple of struct members that are not immediately obvio

[PATCH v3 2/2] ocxl: Document the OCXL_IOCTL_GET_METADATA IOCTL

2018-02-21 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- Documentation/accelerators/ocxl.rst | 5 + 1 file changed, 5 insertions(+) diff --git a/Documentation/accelerators/ocxl.rst b/Documentation/accelerators/ocxl.rst index

[PATCH v3 1/2] ocxl: Add get_metadata IOCTL to share OCXL information to userspace

2018-02-21 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> Some required information is not exposed to userspace currently (eg. the PASID), pass this information back, along with other information which is currently communicated via sysfs, which saves some parsing effort in userspace. Signed-off-by: Al

Re: [PATCH 2/7] powerpc: Use TIDR CPU feature to control TIDR allocation

2018-04-16 Thread Alastair D'Silva
On Tue, 2018-04-17 at 14:21 +1000, Andrew Donnellan wrote: > On 17/04/18 12:09, Alastair D'Silva wrote: > > From: Alastair D'Silva <alast...@d-silva.org> > > > > Switch the use of TIDR on it's CPU feature, rather than assuming it > > is available based on

[PATCH 6/7] ocxl: Add an IOCTL so userspace knows which platform the kernel requires

2018-04-16 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> In order for a userspace AFU driver to call the Power9 specific OCXL_IOCTL_ENABLE_P9_WAIT, it needs to verify that it can actually make that call. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- drivers/misc/ocxl

[PATCH 1/7] powerpc: Add TIDR CPU feature for Power9

2018-04-16 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> This patch adds a CPU feature bit to show whether the CPU has the TIDR register available, enabling as_notify/wait in userspace. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- arch/powerpc/include/asm/cputable.h | 3 ++-

[PATCH 2/7] powerpc: Use TIDR CPU feature to control TIDR allocation

2018-04-16 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> Switch the use of TIDR on it's CPU feature, rather than assuming it is available based on architecture. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- arch/powerpc/kernel/process.c | 4 ++-- 1 file changed, 2 insertions(+),

[PATCH 3/7] powerpc: use task_pid_nr() for TID allocation

2018-04-16 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> The current implementation of TID allocation, using a global IDR, may result in an errant process starving the system of available TIDs. Instead, use task_pid_nr(), as mentioned by the original author. The scenario described which prevented it

[PATCH 7/7] ocxl: Document new OCXL IOCTLs

2018-04-16 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- Documentation/accelerators/ocxl.rst | 10 ++ 1 file changed, 10 insertions(+) diff --git a/Documentation/accelerators/ocxl.rst b/Documentation/accelerators/oc

[PATCH 5/7] ocxl: Expose the thread_id needed for wait on p9

2018-04-16 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> In order to successfully issue as_notify, an AFU needs to know the TID to notify, which in turn means that this information should be available in userspace so it can be communicated to the AFU. Signed-off-by: Alastair D'Silva <alast...@d-

[PATCH 0/7] ocxl: Implement Power9 as_notify/wait for OpenCAPI

2018-04-16 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> The Power 9 as_notify/wait feature provides a lower latency way to signal a thread that work is complete. This series enables the use of this feature from OpenCAPI adapters, as well as addressing a potential starvation issue when allocating thre

[PATCH 4/7] ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action

2018-04-16 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> The function removes the process element from NPU cache. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- arch/powerpc/include/asm/pnv-ocxl.h | 2 +- arch/powerpc/platforms/powernv/ocxl.c | 4 ++-- drivers/misc

[PATCH v2 3/7] powerpc: use task_pid_nr() for TID allocation

2018-04-17 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> The current implementation of TID allocation, using a global IDR, may result in an errant process starving the system of available TIDs. Instead, use task_pid_nr(), as mentioned by the original author. The scenario described which prevented it

[PATCH v2 5/7] ocxl: Expose the thread_id needed for wait on p9

2018-04-17 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> In order to successfully issue as_notify, an AFU needs to know the TID to notify, which in turn means that this information should be available in userspace so it can be communicated to the AFU. Signed-off-by: Alastair D'Silva <alast...@d-

[PATCH v2 2/7] powerpc: Use TIDR CPU feature to control TIDR allocation

2018-04-17 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> Switch the use of TIDR on it's CPU feature, rather than assuming it is available based on architecture. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- arch/powerpc/kernel/process.c | 6 +++--- 1 file changed, 3 insertions(+),

[PATCH v2 7/7] ocxl: Document new OCXL IOCTLs

2018-04-17 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- Documentation/accelerators/ocxl.rst | 11 +++ 1 file changed, 11 insertions(+) diff --git a/Documentation/accelerators/ocxl.rst b/Documentation/accelerators/oc

[PATCH v2 0/7] ocxl: Implement Power9 as_notify/wait for OpenCAPI

2018-04-17 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> The Power 9 as_notify/wait feature provides a lower latency way to signal a thread that work is complete. This series enables the use of this feature from OpenCAPI adapters, as well as addressing a potential starvation issue when allocating thre

[PATCH v2 4/7] ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action

2018-04-17 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> The function removes the process element from NPU cache. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- arch/powerpc/include/asm/pnv-ocxl.h | 2 +- arch/powerpc/platforms/powernv/ocxl.c | 4 ++-- drivers/misc

[PATCH v2 6/7] ocxl: Add an IOCTL so userspace knows what CPU features are available

2018-04-17 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> In order for a userspace AFU driver to call the Power9 specific OCXL_IOCTL_ENABLE_P9_WAIT, it needs to verify that it can actually make that call. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- Documentation/accelerators/o

[PATCH v2 1/7] powerpc: Add TIDR CPU feature for Power9

2018-04-17 Thread Alastair D'Silva
From: Alastair D'Silva <alast...@d-silva.org> This patch adds a CPU feature bit to show whether the CPU has the TIDR register available, enabling as_notify/wait in userspace. Signed-off-by: Alastair D'Silva <alast...@d-silva.org> --- arch/powerpc/include/asm/cputable.h | 3 ++-