From: "Shreyas B. Prabhu" <shreyas@linux.vnet.ibm.com> To: mpe@ellerman.id.au Cc: benh@au1.ibm.com, paulus@ozlabs.org, mikey@neuling.org, ego@linux.vnet.ibm.com, maddy@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, "Shreyas B. Prabhu" <shreyas@linux.vnet.ibm.com>, "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>, Daniel Lezcano <daniel.lezcano@linaro.org>, linux-pm@vger.kernel.org, Rob Herring <robh+dt@kernel.org>, Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com> Subject: [PATCH v6 00/11] powerpc/powernv/cpuidle: Add support for POWER ISA v3 idle states Date: Wed, 8 Jun 2016 11:54:20 -0500 [thread overview] Message-ID: <1465404871-5406-1-git-send-email-shreyas@linux.vnet.ibm.com> (raw) POWER ISA v3 defines a new idle processor core mechanism. In summary, a) new instruction named stop is added. This instruction replaces instructions like nap, sleep, rvwinkle. b) new per thread SPR named PSSCR is added which controls the behavior of stop instruction. PSSCR has following key fields Bits 0:3 - Power-Saving Level Status. This field indicates the lowest power-saving state the thread entered since stop instruction was last executed. Bit 42 - Enable State Loss 0 - No state is lost irrespective of other fields 1 - Allows state loss Bits 44:47 - Power-Saving Level Limit This limits the power-saving level that can be entered into. Bits 60:63 - Requested Level Used to specify which power-saving level must be entered on executing stop instruction Stop idle states and their properties like name, latency, target residency, psscr value are exposed via device tree. This patch series adds support for this new mechanism. Patches 1-7 are cleanups and code movement. Patch 8 adds platform specific support for stop and psscr handling. Patch 9 is a minor cleanup in cpuidle driver. Patch 10 adds cpuidle driver support. Patch 11 makes offlined cpu use deepest stop state. Note: Documentation for the device tree bindings is posted here- http://patchwork.ozlabs.org/patch/629125/ Changes in v6 ============= - Restore new POWER ISA v3 SPRS when waking up from deep idle Changes in v5 ============= - Use generic cpuidle constant CPUIDLE_NAME_LEN - Fix return code handling for of_property_read_string_array - Use DT flags to determine if are using stop instruction, instead of cpu_has_feature - Removed uncessary cast with names - &stop_loop -> stop_loop - Added POWERNV_THRESHOLD_LATENCY_NS to filter out idle states with high latency Changes in v4 ============= - Added a patch to use PNV_THREAD_WINKLE macro while requesting for winkle - Moved power7_powersave_common rename to more appropriate patch - renaming power7_enter_nap_mode to pnv_enter_arch207_idle_mode - Added PSSCR layout to Patch 7's commit message - Improved / Fixed comments - Fixed whitespace error in paca.h - Using MAX_POSSIBLE_STOP_STATE macro instead of hardcoding 0xF has max possible stop state Changes in v3 ============= - Rebased on powerpc-next - Dropping patch 1 since we are not adding a new file for P9 idle support - Improved comments in multiple places - Moved GET_PACA from power7_restore_hyp_resource to System Reset - Instead of moving few functions from idle_power7 to idle_power_common, renaming idle_power7.S to idle_power_common.S - Moved HSTATE_HWTHREAD_STATE updation to power_powersave_common - Dropped earlier patch 5 which moved few macros from idle_power_common to asm/cpuidle.h. - Added a patch to rename reusable power7_* idle functions to pnv_* - Added new patch that creates abstraction for saving SPRs before entering deep idle states - Instead of introducing new file idle_power_stop.S, P9 idle support is added to idle_power_common.S using CPU_FTR sections. - Fixed r4 reg clobbering in power_stop0 Changes in v2 ============= - Rebased on v4.6-rc6 - Using CPU_FTR_ARCH_300 bit instead of CPU_FTR_STOP_INST Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: linux-pm@vger.kernel.org Cc: Benjamin Herrenschmidt <benh@au1.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul Mackerras <paulus@ozlabs.org> Cc: Michael Neuling <mikey@neuling.org> Cc: linuxppc-dev@lists.ozlabs.org Cc: Rob Herring <robh+dt@kernel.org> Cc: Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com> Shreyas B. Prabhu (11): powerpc/powernv: Use PNV_THREAD_WINKLE macro while requesting for winkle powerpc/kvm: make hypervisor state restore a function powerpc/powernv: Rename idle_power7.S to idle_power_common.S powerpc/powernv: Rename reusable idle functions to hardware agnostic names powerpc/powernv: Make pnv_powersave_common more generic powerpc/powernv: abstraction for saving SPRs before entering deep idle states powerpc/powernv: set power_save func after the idle states are initialized powerpc/powernv: Add platform support for stop instruction cpuidle/powernv: Use CPUIDLE_STATE_MAX instead of MAX_POWERNV_IDLE_STATES cpuidle/powernv: Add support for POWER ISA v3 idle states powerpc/powernv: Use deepest stop state when cpu is offlined arch/powerpc/include/asm/cpuidle.h | 2 + arch/powerpc/include/asm/kvm_book3s_asm.h | 2 +- arch/powerpc/include/asm/machdep.h | 1 + arch/powerpc/include/asm/opal-api.h | 11 +- arch/powerpc/include/asm/paca.h | 2 + arch/powerpc/include/asm/ppc-opcode.h | 4 + arch/powerpc/include/asm/processor.h | 1 + arch/powerpc/include/asm/reg.h | 14 + arch/powerpc/kernel/Makefile | 2 +- arch/powerpc/kernel/asm-offsets.c | 2 + arch/powerpc/kernel/exceptions-64s.S | 30 +- arch/powerpc/kernel/idle_power7.S | 515 ---------------------- arch/powerpc/kernel/idle_power_common.S | 682 ++++++++++++++++++++++++++++++ arch/powerpc/kvm/book3s_hv_rmhandlers.S | 4 +- arch/powerpc/platforms/powernv/idle.c | 98 ++++- arch/powerpc/platforms/powernv/powernv.h | 1 + arch/powerpc/platforms/powernv/setup.c | 2 +- arch/powerpc/platforms/powernv/smp.c | 4 +- drivers/cpuidle/cpuidle-powernv.c | 73 +++- 19 files changed, 887 insertions(+), 563 deletions(-) delete mode 100644 arch/powerpc/kernel/idle_power7.S create mode 100644 arch/powerpc/kernel/idle_power_common.S -- 2.1.4
WARNING: multiple messages have this Message-ID (diff)
From: "Shreyas B. Prabhu" <shreyas@linux.vnet.ibm.com> To: mpe@ellerman.id.au Cc: benh@au1.ibm.com, paulus@ozlabs.org, mikey@neuling.org, ego@linux.vnet.ibm.com, maddy@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, "Shreyas B. Prabhu" <shreyas@linux.vnet.ibm.com>, "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>, Daniel Lezcano <daniel.lezcano@linaro.org>, linux-pm@vger.kernel.org, Rob Herring <robh+dt@kernel.org>, Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com> Subject: [PATCH v6 00/11] powerpc/powernv/cpuidle: Add support for POWER ISA v3 idle states Date: Wed, 8 Jun 2016 11:54:20 -0500 [thread overview] Message-ID: <1465404871-5406-1-git-send-email-shreyas@linux.vnet.ibm.com> (raw) POWER ISA v3 defines a new idle processor core mechanism. In summary, a) new instruction named stop is added. This instruction replaces instructions like nap, sleep, rvwinkle. b) new per thread SPR named PSSCR is added which controls the behavior of stop instruction. PSSCR has following key fields Bits 0:3 - Power-Saving Level Status. This field indicates the lowest power-saving state the thread entered since stop instruction was last executed. Bit 42 - Enable State Loss 0 - No state is lost irrespective of other fields 1 - Allows state loss Bits 44:47 - Power-Saving Level Limit This limits the power-saving level that can be entered into. Bits 60:63 - Requested Level Used to specify which power-saving level must be entered on executing stop instruction Stop idle states and their properties like name, latency, target residency, psscr value are exposed via device tree. This patch series adds support for this new mechanism. Patches 1-7 are cleanups and code movement. Patch 8 adds platform specific support for stop and psscr handling. Patch 9 is a minor cleanup in cpuidle driver. Patch 10 adds cpuidle driver support. Patch 11 makes offlined cpu use deepest stop state. Note: Documentation for the device tree bindings is posted here- http://patchwork.ozlabs.org/patch/629125/ Changes in v6 ============= - Restore new POWER ISA v3 SPRS when waking up from deep idle Changes in v5 ============= - Use generic cpuidle constant CPUIDLE_NAME_LEN - Fix return code handling for of_property_read_string_array - Use DT flags to determine if are using stop instruction, instead of cpu_has_feature - Removed uncessary cast with names - &stop_loop -> stop_loop - Added POWERNV_THRESHOLD_LATENCY_NS to filter out idle states with high latency Changes in v4 ============= - Added a patch to use PNV_THREAD_WINKLE macro while requesting for winkle - Moved power7_powersave_common rename to more appropriate patch - renaming power7_enter_nap_mode to pnv_enter_arch207_idle_mode - Added PSSCR layout to Patch 7's commit message - Improved / Fixed comments - Fixed whitespace error in paca.h - Using MAX_POSSIBLE_STOP_STATE macro instead of hardcoding 0xF has max possible stop state Changes in v3 ============= - Rebased on powerpc-next - Dropping patch 1 since we are not adding a new file for P9 idle support - Improved comments in multiple places - Moved GET_PACA from power7_restore_hyp_resource to System Reset - Instead of moving few functions from idle_power7 to idle_power_common, renaming idle_power7.S to idle_power_common.S - Moved HSTATE_HWTHREAD_STATE updation to power_powersave_common - Dropped earlier patch 5 which moved few macros from idle_power_common to asm/cpuidle.h. - Added a patch to rename reusable power7_* idle functions to pnv_* - Added new patch that creates abstraction for saving SPRs before entering deep idle states - Instead of introducing new file idle_power_stop.S, P9 idle support is added to idle_power_common.S using CPU_FTR sections. - Fixed r4 reg clobbering in power_stop0 Changes in v2 ============= - Rebased on v4.6-rc6 - Using CPU_FTR_ARCH_300 bit instead of CPU_FTR_STOP_INST Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: linux-pm@vger.kernel.org Cc: Benjamin Herrenschmidt <benh@au1.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul Mackerras <paulus@ozlabs.org> Cc: Michael Neuling <mikey@neuling.org> Cc: linuxppc-dev@lists.ozlabs.org Cc: Rob Herring <robh+dt@kernel.org> Cc: Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com> Shreyas B. Prabhu (11): powerpc/powernv: Use PNV_THREAD_WINKLE macro while requesting for winkle powerpc/kvm: make hypervisor state restore a function powerpc/powernv: Rename idle_power7.S to idle_power_common.S powerpc/powernv: Rename reusable idle functions to hardware agnostic names powerpc/powernv: Make pnv_powersave_common more generic powerpc/powernv: abstraction for saving SPRs before entering deep idle states powerpc/powernv: set power_save func after the idle states are initialized powerpc/powernv: Add platform support for stop instruction cpuidle/powernv: Use CPUIDLE_STATE_MAX instead of MAX_POWERNV_IDLE_STATES cpuidle/powernv: Add support for POWER ISA v3 idle states powerpc/powernv: Use deepest stop state when cpu is offlined arch/powerpc/include/asm/cpuidle.h | 2 + arch/powerpc/include/asm/kvm_book3s_asm.h | 2 +- arch/powerpc/include/asm/machdep.h | 1 + arch/powerpc/include/asm/opal-api.h | 11 +- arch/powerpc/include/asm/paca.h | 2 + arch/powerpc/include/asm/ppc-opcode.h | 4 + arch/powerpc/include/asm/processor.h | 1 + arch/powerpc/include/asm/reg.h | 14 + arch/powerpc/kernel/Makefile | 2 +- arch/powerpc/kernel/asm-offsets.c | 2 + arch/powerpc/kernel/exceptions-64s.S | 30 +- arch/powerpc/kernel/idle_power7.S | 515 ---------------------- arch/powerpc/kernel/idle_power_common.S | 682 ++++++++++++++++++++++++++++++ arch/powerpc/kvm/book3s_hv_rmhandlers.S | 4 +- arch/powerpc/platforms/powernv/idle.c | 98 ++++- arch/powerpc/platforms/powernv/powernv.h | 1 + arch/powerpc/platforms/powernv/setup.c | 2 +- arch/powerpc/platforms/powernv/smp.c | 4 +- drivers/cpuidle/cpuidle-powernv.c | 73 +++- 19 files changed, 887 insertions(+), 563 deletions(-) delete mode 100644 arch/powerpc/kernel/idle_power7.S create mode 100644 arch/powerpc/kernel/idle_power_common.S -- 2.1.4
next reply other threads:[~2016-06-08 16:55 UTC|newest] Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-06-08 16:54 Shreyas B. Prabhu [this message] 2016-06-08 16:54 ` [PATCH v6 00/11] powerpc/powernv/cpuidle: Add support for POWER ISA v3 idle states Shreyas B. Prabhu 2016-06-08 16:54 ` [PATCH v6 01/11] powerpc/powernv: Use PNV_THREAD_WINKLE macro while requesting for winkle Shreyas B. Prabhu 2016-06-08 16:54 ` [PATCH v6 02/11] powerpc/kvm: make hypervisor state restore a function Shreyas B. Prabhu 2016-06-08 16:54 ` [PATCH v6 03/11] powerpc/powernv: Rename idle_power7.S to idle_power_common.S Shreyas B. Prabhu 2016-06-15 5:31 ` [v6, " Michael Ellerman 2016-06-08 16:54 ` [PATCH v6 04/11] powerpc/powernv: Rename reusable idle functions to hardware agnostic names Shreyas B. Prabhu 2016-06-08 16:54 ` [PATCH v6 05/11] powerpc/powernv: Make pnv_powersave_common more generic Shreyas B. Prabhu 2016-06-08 16:54 ` [PATCH v6 06/11] powerpc/powernv: abstraction for saving SPRs before entering deep idle states Shreyas B. Prabhu 2016-06-08 16:54 ` [PATCH v6 07/11] powerpc/powernv: set power_save func after the idle states are initialized Shreyas B. Prabhu 2016-06-15 5:41 ` [v6, " Michael Ellerman 2016-06-15 6:11 ` Shreyas B Prabhu 2016-06-22 1:54 ` [PATCH v6 " Benjamin Herrenschmidt 2016-06-22 5:11 ` Michael Neuling 2016-06-22 5:11 ` Michael Neuling 2016-06-28 12:10 ` [v6, " Michael Ellerman 2016-06-08 16:54 ` [PATCH v6 08/11] powerpc/powernv: Add platform support for stop instruction Shreyas B. Prabhu 2016-06-15 11:14 ` [v6, " Michael Ellerman 2016-06-15 13:00 ` Shreyas B Prabhu 2016-06-21 6:14 ` Michael Neuling 2016-06-21 6:14 ` Michael Neuling 2016-06-08 16:54 ` [PATCH v6 09/11] cpuidle/powernv: Use CPUIDLE_STATE_MAX instead of MAX_POWERNV_IDLE_STATES Shreyas B. Prabhu 2016-06-13 15:01 ` Daniel Lezcano 2016-06-13 20:58 ` Rafael J. Wysocki 2016-06-08 16:54 ` [PATCH v6 10/11] cpuidle/powernv: Add support for POWER ISA v3 idle states Shreyas B. Prabhu 2016-06-13 15:34 ` Daniel Lezcano 2016-06-14 10:47 ` Shreyas B Prabhu 2016-06-14 11:29 ` Benjamin Herrenschmidt 2016-06-15 4:57 ` Shreyas B Prabhu 2016-06-13 21:48 ` Benjamin Herrenschmidt 2016-06-14 11:11 ` Shreyas B Prabhu 2016-06-14 11:31 ` Benjamin Herrenschmidt 2016-06-14 11:31 ` Benjamin Herrenschmidt 2016-06-08 16:54 ` [PATCH v6 11/11] powerpc/powernv: Use deepest stop state when cpu is offlined Shreyas B. Prabhu
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