Re: [PATCH 0/9] powerpc/powernv: Support for fastsleep and winkle
Hi Rafael, On Tuesday 30 September 2014 04:58 AM, Rafael J. Wysocki wrote: On Monday, September 29, 2014 03:53:06 PM Shreyas B Prabhu wrote: Hi, Any updates on this patch series? I have a couple of patches from there in my tree it seems. Please have a look at linux-pm.git/linux-next and please let me know if that's the case. I checked linux-pm.git/linux-net (Last commit 067c17382165). None of the patches in this series are present in the tree. On Thursday 18 September 2014 08:41 AM, Shreyas B Prabhu wrote: Hi, In this patch series we use winkle for offlined cores. I successfully tested the working of this with subcore functionality. Test scenario was as follows: 1. Set SMT mode to 1, Set subores-per-core to 1 2. Offline a core, in this case cpu 32 (sending it to winkle) 3. Set subcores-per-core to 4 4. Online the core 5. Start a guest (Topology 1 core 2 threads) on a subcore, in this case on cpu 36 This works without any glitch. Thanks, Shreyas On Monday 25 August 2014 11:31 PM, Shreyas B. Prabhu wrote: Fast sleep is an idle state, where the core and the L1 and L2 caches are brought down to a threshold voltage. This also means that the communication between L2 and L3 caches have to be fenced. However the current P8 chips have a bug wherein this fencing between L2 and L3 caches get delayed by a cpu cycle. This can delay L3 response to the other cpus if they request for data during this time. Thus they would fetch the same data from the memory which could lead to data corruption if L3 cache is not flushed. Patch 4 adds support to work around this. 'Deep Winkle' is a deeper idle state where core and private L2 are powered off. While it offers higher power savings, it is at the cost of losing hypervisor register state and higher latency. Patch 5-9 adds support for winkle and uses it for offline cpus. Patch 1 - Moves parameters required discover idle states to a location common to both cpuidle driver and powernv core code Patch 2 - Populates idle state details from device tree Patch 3 - Enables cpus to run guest after waking up from fastsleep/winkle Cc: Benjamin Herrenschmidt b...@kernel.crashing.org Cc: Paul Mackerras pau...@samba.org Cc: Michael Ellerman m...@ellerman.id.au Cc: Rafael J. Wysocki r...@rjwysocki.net Cc: Srivatsa S. Bhat sriva...@mit.edu Cc: Preeti U. Murthy pre...@linux.vnet.ibm.com Cc: Vaidyanathan Srinivasan sva...@linux.vnet.ibm.com Cc: Rob Herring robh...@kernel.org Cc: Grant Likely grant.lik...@linaro.org Cc: devicet...@vger.kernel.org Cc: linux...@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Preeti U Murthy (2): cpuidle/powernv: Populate cpuidle state details by querying the device-tree powerpc/powernv/cpuidle: Add workaround to enable fastsleep Shreyas B. Prabhu (6): powerpc/kvm/book3s_hv: Enable CPUs to run guest after waking up from fast-sleep powerpc/powernv: Add OPAL call to save and restore powerpc: Adding macro for accessing Thread Switch Control Register powerpc/powernv: Add winkle infrastructure powerpc/powernv: Discover and enable winkle powerpc/powernv: Enter deepest supported idle state in offline Srivatsa S. Bhat (1): powerpc/powernv: Enable Offline CPUs to enter deep idle states arch/powerpc/include/asm/machdep.h | 4 + arch/powerpc/include/asm/opal.h| 10 ++ arch/powerpc/include/asm/paca.h| 3 + arch/powerpc/include/asm/ppc-opcode.h | 2 + arch/powerpc/include/asm/processor.h | 6 +- arch/powerpc/include/asm/reg.h | 1 + arch/powerpc/kernel/asm-offsets.c | 1 + arch/powerpc/kernel/exceptions-64s.S | 37 ++--- arch/powerpc/kernel/idle.c | 30 arch/powerpc/kernel/idle_power7.S | 83 +- arch/powerpc/platforms/powernv/opal-wrappers.S | 2 + arch/powerpc/platforms/powernv/powernv.h | 8 + arch/powerpc/platforms/powernv/setup.c | 217 + arch/powerpc/platforms/powernv/smp.c | 13 +- arch/powerpc/platforms/powernv/subcore.c | 15 ++ drivers/cpuidle/cpuidle-powernv.c | 40 - 16 files changed, 439 insertions(+), 33 deletions(-) ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
Re: [PATCH 0/9] powerpc/powernv: Support for fastsleep and winkle
On Tuesday, September 30, 2014 01:42:05 PM Shreyas B Prabhu wrote: Hi Rafael, On Tuesday 30 September 2014 04:58 AM, Rafael J. Wysocki wrote: On Monday, September 29, 2014 03:53:06 PM Shreyas B Prabhu wrote: Hi, Any updates on this patch series? I have a couple of patches from there in my tree it seems. Please have a look at linux-pm.git/linux-next and please let me know if that's the case. I checked linux-pm.git/linux-net (Last commit 067c17382165). None of the patches in this series are present in the tree. OK, thanks for checking. Would you mind resending it with any ACKs or Reviewed-by tags received so far? On Thursday 18 September 2014 08:41 AM, Shreyas B Prabhu wrote: Hi, In this patch series we use winkle for offlined cores. I successfully tested the working of this with subcore functionality. Test scenario was as follows: 1. Set SMT mode to 1, Set subores-per-core to 1 2. Offline a core, in this case cpu 32 (sending it to winkle) 3. Set subcores-per-core to 4 4. Online the core 5. Start a guest (Topology 1 core 2 threads) on a subcore, in this case on cpu 36 This works without any glitch. Thanks, Shreyas On Monday 25 August 2014 11:31 PM, Shreyas B. Prabhu wrote: Fast sleep is an idle state, where the core and the L1 and L2 caches are brought down to a threshold voltage. This also means that the communication between L2 and L3 caches have to be fenced. However the current P8 chips have a bug wherein this fencing between L2 and L3 caches get delayed by a cpu cycle. This can delay L3 response to the other cpus if they request for data during this time. Thus they would fetch the same data from the memory which could lead to data corruption if L3 cache is not flushed. Patch 4 adds support to work around this. 'Deep Winkle' is a deeper idle state where core and private L2 are powered off. While it offers higher power savings, it is at the cost of losing hypervisor register state and higher latency. Patch 5-9 adds support for winkle and uses it for offline cpus. Patch 1 - Moves parameters required discover idle states to a location common to both cpuidle driver and powernv core code Patch 2 - Populates idle state details from device tree Patch 3 - Enables cpus to run guest after waking up from fastsleep/winkle Cc: Benjamin Herrenschmidt b...@kernel.crashing.org Cc: Paul Mackerras pau...@samba.org Cc: Michael Ellerman m...@ellerman.id.au Cc: Rafael J. Wysocki r...@rjwysocki.net Cc: Srivatsa S. Bhat sriva...@mit.edu Cc: Preeti U. Murthy pre...@linux.vnet.ibm.com Cc: Vaidyanathan Srinivasan sva...@linux.vnet.ibm.com Cc: Rob Herring robh...@kernel.org Cc: Grant Likely grant.lik...@linaro.org Cc: devicet...@vger.kernel.org Cc: linux...@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Preeti U Murthy (2): cpuidle/powernv: Populate cpuidle state details by querying the device-tree powerpc/powernv/cpuidle: Add workaround to enable fastsleep Shreyas B. Prabhu (6): powerpc/kvm/book3s_hv: Enable CPUs to run guest after waking up from fast-sleep powerpc/powernv: Add OPAL call to save and restore powerpc: Adding macro for accessing Thread Switch Control Register powerpc/powernv: Add winkle infrastructure powerpc/powernv: Discover and enable winkle powerpc/powernv: Enter deepest supported idle state in offline Srivatsa S. Bhat (1): powerpc/powernv: Enable Offline CPUs to enter deep idle states arch/powerpc/include/asm/machdep.h | 4 + arch/powerpc/include/asm/opal.h| 10 ++ arch/powerpc/include/asm/paca.h| 3 + arch/powerpc/include/asm/ppc-opcode.h | 2 + arch/powerpc/include/asm/processor.h | 6 +- arch/powerpc/include/asm/reg.h | 1 + arch/powerpc/kernel/asm-offsets.c | 1 + arch/powerpc/kernel/exceptions-64s.S | 37 ++--- arch/powerpc/kernel/idle.c | 30 arch/powerpc/kernel/idle_power7.S | 83 +- arch/powerpc/platforms/powernv/opal-wrappers.S | 2 + arch/powerpc/platforms/powernv/powernv.h | 8 + arch/powerpc/platforms/powernv/setup.c | 217 + arch/powerpc/platforms/powernv/smp.c | 13 +- arch/powerpc/platforms/powernv/subcore.c | 15 ++ drivers/cpuidle/cpuidle-powernv.c | 40 - 16 files changed, 439 insertions(+), 33 deletions(-) -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. ___ Linuxppc-dev mailing
Re: [PATCH 0/9] powerpc/powernv: Support for fastsleep and winkle
Hi, Any updates on this patch series? On Thursday 18 September 2014 08:41 AM, Shreyas B Prabhu wrote: Hi, In this patch series we use winkle for offlined cores. I successfully tested the working of this with subcore functionality. Test scenario was as follows: 1. Set SMT mode to 1, Set subores-per-core to 1 2. Offline a core, in this case cpu 32 (sending it to winkle) 3. Set subcores-per-core to 4 4. Online the core 5. Start a guest (Topology 1 core 2 threads) on a subcore, in this case on cpu 36 This works without any glitch. Thanks, Shreyas On Monday 25 August 2014 11:31 PM, Shreyas B. Prabhu wrote: Fast sleep is an idle state, where the core and the L1 and L2 caches are brought down to a threshold voltage. This also means that the communication between L2 and L3 caches have to be fenced. However the current P8 chips have a bug wherein this fencing between L2 and L3 caches get delayed by a cpu cycle. This can delay L3 response to the other cpus if they request for data during this time. Thus they would fetch the same data from the memory which could lead to data corruption if L3 cache is not flushed. Patch 4 adds support to work around this. 'Deep Winkle' is a deeper idle state where core and private L2 are powered off. While it offers higher power savings, it is at the cost of losing hypervisor register state and higher latency. Patch 5-9 adds support for winkle and uses it for offline cpus. Patch 1 - Moves parameters required discover idle states to a location common to both cpuidle driver and powernv core code Patch 2 - Populates idle state details from device tree Patch 3 - Enables cpus to run guest after waking up from fastsleep/winkle Cc: Benjamin Herrenschmidt b...@kernel.crashing.org Cc: Paul Mackerras pau...@samba.org Cc: Michael Ellerman m...@ellerman.id.au Cc: Rafael J. Wysocki r...@rjwysocki.net Cc: Srivatsa S. Bhat sriva...@mit.edu Cc: Preeti U. Murthy pre...@linux.vnet.ibm.com Cc: Vaidyanathan Srinivasan sva...@linux.vnet.ibm.com Cc: Rob Herring robh...@kernel.org Cc: Grant Likely grant.lik...@linaro.org Cc: devicet...@vger.kernel.org Cc: linux...@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Preeti U Murthy (2): cpuidle/powernv: Populate cpuidle state details by querying the device-tree powerpc/powernv/cpuidle: Add workaround to enable fastsleep Shreyas B. Prabhu (6): powerpc/kvm/book3s_hv: Enable CPUs to run guest after waking up from fast-sleep powerpc/powernv: Add OPAL call to save and restore powerpc: Adding macro for accessing Thread Switch Control Register powerpc/powernv: Add winkle infrastructure powerpc/powernv: Discover and enable winkle powerpc/powernv: Enter deepest supported idle state in offline Srivatsa S. Bhat (1): powerpc/powernv: Enable Offline CPUs to enter deep idle states arch/powerpc/include/asm/machdep.h | 4 + arch/powerpc/include/asm/opal.h| 10 ++ arch/powerpc/include/asm/paca.h| 3 + arch/powerpc/include/asm/ppc-opcode.h | 2 + arch/powerpc/include/asm/processor.h | 6 +- arch/powerpc/include/asm/reg.h | 1 + arch/powerpc/kernel/asm-offsets.c | 1 + arch/powerpc/kernel/exceptions-64s.S | 37 ++--- arch/powerpc/kernel/idle.c | 30 arch/powerpc/kernel/idle_power7.S | 83 +- arch/powerpc/platforms/powernv/opal-wrappers.S | 2 + arch/powerpc/platforms/powernv/powernv.h | 8 + arch/powerpc/platforms/powernv/setup.c | 217 + arch/powerpc/platforms/powernv/smp.c | 13 +- arch/powerpc/platforms/powernv/subcore.c | 15 ++ drivers/cpuidle/cpuidle-powernv.c | 40 - 16 files changed, 439 insertions(+), 33 deletions(-) ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
Re: [PATCH 0/9] powerpc/powernv: Support for fastsleep and winkle
On Monday, September 29, 2014 03:53:06 PM Shreyas B Prabhu wrote: Hi, Any updates on this patch series? I have a couple of patches from there in my tree it seems. Please have a look at linux-pm.git/linux-next and please let me know if that's the case. On Thursday 18 September 2014 08:41 AM, Shreyas B Prabhu wrote: Hi, In this patch series we use winkle for offlined cores. I successfully tested the working of this with subcore functionality. Test scenario was as follows: 1. Set SMT mode to 1, Set subores-per-core to 1 2. Offline a core, in this case cpu 32 (sending it to winkle) 3. Set subcores-per-core to 4 4. Online the core 5. Start a guest (Topology 1 core 2 threads) on a subcore, in this case on cpu 36 This works without any glitch. Thanks, Shreyas On Monday 25 August 2014 11:31 PM, Shreyas B. Prabhu wrote: Fast sleep is an idle state, where the core and the L1 and L2 caches are brought down to a threshold voltage. This also means that the communication between L2 and L3 caches have to be fenced. However the current P8 chips have a bug wherein this fencing between L2 and L3 caches get delayed by a cpu cycle. This can delay L3 response to the other cpus if they request for data during this time. Thus they would fetch the same data from the memory which could lead to data corruption if L3 cache is not flushed. Patch 4 adds support to work around this. 'Deep Winkle' is a deeper idle state where core and private L2 are powered off. While it offers higher power savings, it is at the cost of losing hypervisor register state and higher latency. Patch 5-9 adds support for winkle and uses it for offline cpus. Patch 1 - Moves parameters required discover idle states to a location common to both cpuidle driver and powernv core code Patch 2 - Populates idle state details from device tree Patch 3 - Enables cpus to run guest after waking up from fastsleep/winkle Cc: Benjamin Herrenschmidt b...@kernel.crashing.org Cc: Paul Mackerras pau...@samba.org Cc: Michael Ellerman m...@ellerman.id.au Cc: Rafael J. Wysocki r...@rjwysocki.net Cc: Srivatsa S. Bhat sriva...@mit.edu Cc: Preeti U. Murthy pre...@linux.vnet.ibm.com Cc: Vaidyanathan Srinivasan sva...@linux.vnet.ibm.com Cc: Rob Herring robh...@kernel.org Cc: Grant Likely grant.lik...@linaro.org Cc: devicet...@vger.kernel.org Cc: linux...@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Preeti U Murthy (2): cpuidle/powernv: Populate cpuidle state details by querying the device-tree powerpc/powernv/cpuidle: Add workaround to enable fastsleep Shreyas B. Prabhu (6): powerpc/kvm/book3s_hv: Enable CPUs to run guest after waking up from fast-sleep powerpc/powernv: Add OPAL call to save and restore powerpc: Adding macro for accessing Thread Switch Control Register powerpc/powernv: Add winkle infrastructure powerpc/powernv: Discover and enable winkle powerpc/powernv: Enter deepest supported idle state in offline Srivatsa S. Bhat (1): powerpc/powernv: Enable Offline CPUs to enter deep idle states arch/powerpc/include/asm/machdep.h | 4 + arch/powerpc/include/asm/opal.h| 10 ++ arch/powerpc/include/asm/paca.h| 3 + arch/powerpc/include/asm/ppc-opcode.h | 2 + arch/powerpc/include/asm/processor.h | 6 +- arch/powerpc/include/asm/reg.h | 1 + arch/powerpc/kernel/asm-offsets.c | 1 + arch/powerpc/kernel/exceptions-64s.S | 37 ++--- arch/powerpc/kernel/idle.c | 30 arch/powerpc/kernel/idle_power7.S | 83 +- arch/powerpc/platforms/powernv/opal-wrappers.S | 2 + arch/powerpc/platforms/powernv/powernv.h | 8 + arch/powerpc/platforms/powernv/setup.c | 217 + arch/powerpc/platforms/powernv/smp.c | 13 +- arch/powerpc/platforms/powernv/subcore.c | 15 ++ drivers/cpuidle/cpuidle-powernv.c | 40 - 16 files changed, 439 insertions(+), 33 deletions(-) -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
Re: [PATCH 0/9] powerpc/powernv: Support for fastsleep and winkle
Hi, In this patch series we use winkle for offlined cores. I successfully tested the working of this with subcore functionality. Test scenario was as follows: 1. Set SMT mode to 1, Set subores-per-core to 1 2. Offline a core, in this case cpu 32 (sending it to winkle) 3. Set subcores-per-core to 4 4. Online the core 5. Start a guest (Topology 1 core 2 threads) on a subcore, in this case on cpu 36 This works without any glitch. Thanks, Shreyas On Monday 25 August 2014 11:31 PM, Shreyas B. Prabhu wrote: Fast sleep is an idle state, where the core and the L1 and L2 caches are brought down to a threshold voltage. This also means that the communication between L2 and L3 caches have to be fenced. However the current P8 chips have a bug wherein this fencing between L2 and L3 caches get delayed by a cpu cycle. This can delay L3 response to the other cpus if they request for data during this time. Thus they would fetch the same data from the memory which could lead to data corruption if L3 cache is not flushed. Patch 4 adds support to work around this. 'Deep Winkle' is a deeper idle state where core and private L2 are powered off. While it offers higher power savings, it is at the cost of losing hypervisor register state and higher latency. Patch 5-9 adds support for winkle and uses it for offline cpus. Patch 1 - Moves parameters required discover idle states to a location common to both cpuidle driver and powernv core code Patch 2 - Populates idle state details from device tree Patch 3 - Enables cpus to run guest after waking up from fastsleep/winkle Cc: Benjamin Herrenschmidt b...@kernel.crashing.org Cc: Paul Mackerras pau...@samba.org Cc: Michael Ellerman m...@ellerman.id.au Cc: Rafael J. Wysocki r...@rjwysocki.net Cc: Srivatsa S. Bhat sriva...@mit.edu Cc: Preeti U. Murthy pre...@linux.vnet.ibm.com Cc: Vaidyanathan Srinivasan sva...@linux.vnet.ibm.com Cc: Rob Herring robh...@kernel.org Cc: Grant Likely grant.lik...@linaro.org Cc: devicet...@vger.kernel.org Cc: linux...@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Preeti U Murthy (2): cpuidle/powernv: Populate cpuidle state details by querying the device-tree powerpc/powernv/cpuidle: Add workaround to enable fastsleep Shreyas B. Prabhu (6): powerpc/kvm/book3s_hv: Enable CPUs to run guest after waking up from fast-sleep powerpc/powernv: Add OPAL call to save and restore powerpc: Adding macro for accessing Thread Switch Control Register powerpc/powernv: Add winkle infrastructure powerpc/powernv: Discover and enable winkle powerpc/powernv: Enter deepest supported idle state in offline Srivatsa S. Bhat (1): powerpc/powernv: Enable Offline CPUs to enter deep idle states arch/powerpc/include/asm/machdep.h | 4 + arch/powerpc/include/asm/opal.h| 10 ++ arch/powerpc/include/asm/paca.h| 3 + arch/powerpc/include/asm/ppc-opcode.h | 2 + arch/powerpc/include/asm/processor.h | 6 +- arch/powerpc/include/asm/reg.h | 1 + arch/powerpc/kernel/asm-offsets.c | 1 + arch/powerpc/kernel/exceptions-64s.S | 37 ++--- arch/powerpc/kernel/idle.c | 30 arch/powerpc/kernel/idle_power7.S | 83 +- arch/powerpc/platforms/powernv/opal-wrappers.S | 2 + arch/powerpc/platforms/powernv/powernv.h | 8 + arch/powerpc/platforms/powernv/setup.c | 217 + arch/powerpc/platforms/powernv/smp.c | 13 +- arch/powerpc/platforms/powernv/subcore.c | 15 ++ drivers/cpuidle/cpuidle-powernv.c | 40 - 16 files changed, 439 insertions(+), 33 deletions(-) ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
Re: [PATCH 0/9] powerpc/powernv: Support for fastsleep and winkle
Hi, Any updates on this patch series? On Monday 25 August 2014 11:31 PM, Shreyas B. Prabhu wrote: Fast sleep is an idle state, where the core and the L1 and L2 caches are brought down to a threshold voltage. This also means that the communication between L2 and L3 caches have to be fenced. However the current P8 chips have a bug wherein this fencing between L2 and L3 caches get delayed by a cpu cycle. This can delay L3 response to the other cpus if they request for data during this time. Thus they would fetch the same data from the memory which could lead to data corruption if L3 cache is not flushed. Patch 4 adds support to work around this. 'Deep Winkle' is a deeper idle state where core and private L2 are powered off. While it offers higher power savings, it is at the cost of losing hypervisor register state and higher latency. Patch 5-9 adds support for winkle and uses it for offline cpus. Patch 1 - Moves parameters required discover idle states to a location common to both cpuidle driver and powernv core code Patch 2 - Populates idle state details from device tree Patch 3 - Enables cpus to run guest after waking up from fastsleep/winkle Cc: Benjamin Herrenschmidt b...@kernel.crashing.org Cc: Paul Mackerras pau...@samba.org Cc: Michael Ellerman m...@ellerman.id.au Cc: Rafael J. Wysocki r...@rjwysocki.net Cc: Srivatsa S. Bhat sriva...@mit.edu Cc: Preeti U. Murthy pre...@linux.vnet.ibm.com Cc: Vaidyanathan Srinivasan sva...@linux.vnet.ibm.com Cc: Rob Herring robh...@kernel.org Cc: Grant Likely grant.lik...@linaro.org Cc: devicet...@vger.kernel.org Cc: linux...@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Preeti U Murthy (2): cpuidle/powernv: Populate cpuidle state details by querying the device-tree powerpc/powernv/cpuidle: Add workaround to enable fastsleep Shreyas B. Prabhu (6): powerpc/kvm/book3s_hv: Enable CPUs to run guest after waking up from fast-sleep powerpc/powernv: Add OPAL call to save and restore powerpc: Adding macro for accessing Thread Switch Control Register powerpc/powernv: Add winkle infrastructure powerpc/powernv: Discover and enable winkle powerpc/powernv: Enter deepest supported idle state in offline Srivatsa S. Bhat (1): powerpc/powernv: Enable Offline CPUs to enter deep idle states arch/powerpc/include/asm/machdep.h | 4 + arch/powerpc/include/asm/opal.h| 10 ++ arch/powerpc/include/asm/paca.h| 3 + arch/powerpc/include/asm/ppc-opcode.h | 2 + arch/powerpc/include/asm/processor.h | 6 +- arch/powerpc/include/asm/reg.h | 1 + arch/powerpc/kernel/asm-offsets.c | 1 + arch/powerpc/kernel/exceptions-64s.S | 37 ++--- arch/powerpc/kernel/idle.c | 30 arch/powerpc/kernel/idle_power7.S | 83 +- arch/powerpc/platforms/powernv/opal-wrappers.S | 2 + arch/powerpc/platforms/powernv/powernv.h | 8 + arch/powerpc/platforms/powernv/setup.c | 217 + arch/powerpc/platforms/powernv/smp.c | 13 +- arch/powerpc/platforms/powernv/subcore.c | 15 ++ drivers/cpuidle/cpuidle-powernv.c | 40 - 16 files changed, 439 insertions(+), 33 deletions(-) ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
[PATCH 0/9] powerpc/powernv: Support for fastsleep and winkle
Fast sleep is an idle state, where the core and the L1 and L2 caches are brought down to a threshold voltage. This also means that the communication between L2 and L3 caches have to be fenced. However the current P8 chips have a bug wherein this fencing between L2 and L3 caches get delayed by a cpu cycle. This can delay L3 response to the other cpus if they request for data during this time. Thus they would fetch the same data from the memory which could lead to data corruption if L3 cache is not flushed. Patch 4 adds support to work around this. 'Deep Winkle' is a deeper idle state where core and private L2 are powered off. While it offers higher power savings, it is at the cost of losing hypervisor register state and higher latency. Patch 5-9 adds support for winkle and uses it for offline cpus. Patch 1 - Moves parameters required discover idle states to a location common to both cpuidle driver and powernv core code Patch 2 - Populates idle state details from device tree Patch 3 - Enables cpus to run guest after waking up from fastsleep/winkle Cc: Benjamin Herrenschmidt b...@kernel.crashing.org Cc: Paul Mackerras pau...@samba.org Cc: Michael Ellerman m...@ellerman.id.au Cc: Rafael J. Wysocki r...@rjwysocki.net Cc: Srivatsa S. Bhat sriva...@mit.edu Cc: Preeti U. Murthy pre...@linux.vnet.ibm.com Cc: Vaidyanathan Srinivasan sva...@linux.vnet.ibm.com Cc: Rob Herring robh...@kernel.org Cc: Grant Likely grant.lik...@linaro.org Cc: devicet...@vger.kernel.org Cc: linux...@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Preeti U Murthy (2): cpuidle/powernv: Populate cpuidle state details by querying the device-tree powerpc/powernv/cpuidle: Add workaround to enable fastsleep Shreyas B. Prabhu (6): powerpc/kvm/book3s_hv: Enable CPUs to run guest after waking up from fast-sleep powerpc/powernv: Add OPAL call to save and restore powerpc: Adding macro for accessing Thread Switch Control Register powerpc/powernv: Add winkle infrastructure powerpc/powernv: Discover and enable winkle powerpc/powernv: Enter deepest supported idle state in offline Srivatsa S. Bhat (1): powerpc/powernv: Enable Offline CPUs to enter deep idle states arch/powerpc/include/asm/machdep.h | 4 + arch/powerpc/include/asm/opal.h| 10 ++ arch/powerpc/include/asm/paca.h| 3 + arch/powerpc/include/asm/ppc-opcode.h | 2 + arch/powerpc/include/asm/processor.h | 6 +- arch/powerpc/include/asm/reg.h | 1 + arch/powerpc/kernel/asm-offsets.c | 1 + arch/powerpc/kernel/exceptions-64s.S | 37 ++--- arch/powerpc/kernel/idle.c | 30 arch/powerpc/kernel/idle_power7.S | 83 +- arch/powerpc/platforms/powernv/opal-wrappers.S | 2 + arch/powerpc/platforms/powernv/powernv.h | 8 + arch/powerpc/platforms/powernv/setup.c | 217 + arch/powerpc/platforms/powernv/smp.c | 13 +- arch/powerpc/platforms/powernv/subcore.c | 15 ++ drivers/cpuidle/cpuidle-powernv.c | 40 - 16 files changed, 439 insertions(+), 33 deletions(-) -- 1.9.0 ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
[PATCH 0/9] powerpc/powernv: Support for fastsleep and winkle
Fast sleep is an idle state, where the core and the L1 and L2 caches are brought down to a threshold voltage. This also means that the communication between L2 and L3 caches have to be fenced. However the current P8 chips have a bug wherein this fencing between L2 and L3 caches get delayed by a cpu cycle. This can delay L3 response to the other cpus if they request for data during this time. Thus they would fetch the same data from the memory which could lead to data corruption if L3 cache is not flushed. Patch 4 adds support to work around this. 'Deep Winkle' is a deeper idle state where core and private L2 are powered off. While it offers higher power savings, it is at the cost of losing hypervisor register state and higher latency. Patch 5-9 adds support for winkle and uses it for offline cpus. Patch 1 - Moves parameters required discover idle states to a location common to both cpuidle driver and powernv core code Patch 2 - Populates idle state details from device tree Patch 3 - Enables cpus to run guest after waking up from fastsleep/winkle Cc: Benjamin Herrenschmidt b...@kernel.crashing.org Cc: Paul Mackerras pau...@samba.org Cc: Michael Ellerman m...@ellerman.id.au Cc: Rafael J. Wysocki r...@rjwysocki.net Cc: Srivatsa S. Bhat sriva...@mit.edu Cc: Preeti U. Murthy pre...@linux.vnet.ibm.com Cc: Vaidyanathan Srinivasan sva...@linux.vnet.ibm.com Cc: Rob Herring robh...@kernel.org Cc: Grant Likely grant.lik...@linaro.org Cc: devicet...@vger.kernel.org Cc: linux...@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Preeti U Murthy (2): cpuidle/powernv: Populate cpuidle state details by querying the device-tree powerpc/powernv/cpuidle: Add workaround to enable fastsleep Shreyas B. Prabhu (6): powerpc/kvm/book3s_hv: Enable CPUs to run guest after waking up from fast-sleep powerpc/powernv: Add OPAL call to save and restore powerpc: Adding macro for accessing Thread Switch Control Register powerpc/powernv: Add winkle infrastructure powerpc/powernv: Discover and enable winkle powerpc/powernv: Enter deepest supported idle state in offline Srivatsa S. Bhat (1): powerpc/powernv: Enable Offline CPUs to enter deep idle states arch/powerpc/include/asm/machdep.h | 4 + arch/powerpc/include/asm/opal.h| 10 ++ arch/powerpc/include/asm/paca.h| 3 + arch/powerpc/include/asm/ppc-opcode.h | 2 + arch/powerpc/include/asm/processor.h | 6 +- arch/powerpc/include/asm/reg.h | 1 + arch/powerpc/kernel/asm-offsets.c | 1 + arch/powerpc/kernel/exceptions-64s.S | 37 ++--- arch/powerpc/kernel/idle.c | 30 arch/powerpc/kernel/idle_power7.S | 83 +- arch/powerpc/platforms/powernv/opal-wrappers.S | 2 + arch/powerpc/platforms/powernv/powernv.h | 8 + arch/powerpc/platforms/powernv/setup.c | 217 + arch/powerpc/platforms/powernv/smp.c | 13 +- arch/powerpc/platforms/powernv/subcore.c | 15 ++ drivers/cpuidle/cpuidle-powernv.c | 40 - 16 files changed, 439 insertions(+), 33 deletions(-) -- 1.9.0 ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
