search for: ppc_md

...t cpu) > +{ > + /* > + ?* pSeries and powerNV can be built into same kernel image. In > + ?* principle we need return false directly if we are running as > + ?* powerNV. However the yield_count is always zero on powerNV, So > + ?* skip such machine type check Or you could use the ppc_md interface callbacks if required, but your solution works as well > + ?*/ > + return !!(be32_to_cpu(lppaca_of(cpu).yield_count) & 1); > +} > +#endif > + > ?static __always_inline int arch_spin_value_unlocked(arch_spinlock_t lock) > ?{ > ? return lock.slock == 0; Balbir...

...t cpu) > +{ > + /* > + ?* pSeries and powerNV can be built into same kernel image. In > + ?* principle we need return false directly if we are running as > + ?* powerNV. However the yield_count is always zero on powerNV, So > + ?* skip such machine type check Or you could use the ppc_md interface callbacks if required, but your solution works as well > + ?*/ > + return !!(be32_to_cpu(lppaca_of(cpu).yield_count) & 1); > +} > +#endif > + > ?static __always_inline int arch_spin_value_unlocked(arch_spinlock_t lock) > ?{ > ? return lock.slock == 0; Balbir...

...etup_arch(void) if (firmware_has_feature(FW_FEATURE_LPAR)) { vpa_init(boot_cpuid); - if (lppaca_shared_proc(get_lppaca())) + if (lppaca_shared_proc(get_lppaca())) { static_branch_enable(&shared_processor); +#ifdef CONFIG_PARAVIRT_SPINLOCKS + pv_spinlocks_init(); +#endif + } ppc_md.power_save = pseries_lpar_idle; ppc_md.enable_pmcs = pseries_lpar_enable_pmcs; diff --git a/include/asm-generic/qspinlock.h b/include/asm-generic/qspinlock.h index fb0a814d4395..38ca14e79a86 100644 --- a/include/asm-generic/qspinlock.h +++ b/include/asm-generic/qspinlock.h @@ -69,6 +69,7 @@ stat...

...etup_arch(void) if (firmware_has_feature(FW_FEATURE_LPAR)) { vpa_init(boot_cpuid); - if (lppaca_shared_proc(get_lppaca())) + if (lppaca_shared_proc(get_lppaca())) { static_branch_enable(&shared_processor); +#ifdef CONFIG_PARAVIRT_SPINLOCKS + pv_spinlocks_init(); +#endif + } ppc_md.power_save = pseries_lpar_idle; ppc_md.enable_pmcs = pseries_lpar_enable_pmcs; diff --git a/include/asm-generic/qspinlock.h b/include/asm-generic/qspinlock.h index fb0a814d4395..38ca14e79a86 100644 --- a/include/asm-generic/qspinlock.h +++ b/include/asm-generic/qspinlock.h @@ -69,6 +69,7 @@ stat...

...etup_arch(void) if (firmware_has_feature(FW_FEATURE_LPAR)) { vpa_init(boot_cpuid); - if (lppaca_shared_proc(get_lppaca())) + if (lppaca_shared_proc(get_lppaca())) { static_branch_enable(&shared_processor); +#ifdef CONFIG_PARAVIRT_SPINLOCKS + pv_spinlocks_init(); +#endif + } ppc_md.power_save = pseries_lpar_idle; ppc_md.enable_pmcs = pseries_lpar_enable_pmcs; diff --git a/include/asm-generic/qspinlock.h b/include/asm-generic/qspinlock.h index fb0a814d4395..38ca14e79a86 100644 --- a/include/asm-generic/qspinlock.h +++ b/include/asm-generic/qspinlock.h @@ -69,6 +69,7 @@ stat...

...first two patches are the fundamentals, stolen mainly from the VMI patches: removing assumptions about the kernel running in ring 0, and macro-izing all the obvious para-virtualize-needing insns. The third patch is more ambitious: it introduces a "paravirt_ops" structure (a-la PPC's ppc_md) through which all these ops are indirected. This should allow Xen, VMI and other variants to build on a common base. These patches also live at http://kernel.org/pub/linux/kernel/people/rusty/Paravirt Feedback welcome! Rusty. Name: Kernel Ring Cleanups Status: Booted on 2.6.16-rc2-git7 Signed...

...first two patches are the fundamentals, stolen mainly from the VMI patches: removing assumptions about the kernel running in ring 0, and macro-izing all the obvious para-virtualize-needing insns. The third patch is more ambitious: it introduces a "paravirt_ops" structure (a-la PPC's ppc_md) through which all these ops are indirected. This should allow Xen, VMI and other variants to build on a common base. These patches also live at http://kernel.org/pub/linux/kernel/people/rusty/Paravirt Feedback welcome! Rusty. Name: Kernel Ring Cleanups Status: Booted on 2.6.16-rc2-git7 Signed...

v2 is updated to account for feedback from Will, Peter, and Waiman (thank you), and trims off a couple of RFC and unrelated patches. Thanks, Nick Nicholas Piggin (6): powerpc/powernv: must include hvcall.h to get PAPR defines powerpc/pseries: move some PAPR paravirt functions to their own file powerpc: move spinlock implementation to simple_spinlock powerpc/64s: implement queued

Updated with everybody's feedback (thanks all), and more performance results. What I've found is I might have been measuring the worst load point for the paravirt case, and by looking at a range of loads it's clear that queued spinlocks are overall better even on PV, doubly so when you look at the generally much improved worst case latencies. I have defaulted it to N even though

This series adds an option to use queued spinlocks for powerpc, and makes it the default for the Book3S-64 subarch. This effort starts with the generic code so it's very simple but still very performant. There are optimisations that can be made to slowpaths, but I think it's better to attack those incrementally if/when we find things, and try to add the improvements to generic code as

v3 is updated to use __pv_queued_spin_unlock, noticed by Waiman (thank you). Thanks, Nick Nicholas Piggin (6): powerpc/powernv: must include hvcall.h to get PAPR defines powerpc/pseries: move some PAPR paravirt functions to their own file powerpc: move spinlock implementation to simple_spinlock powerpc/64s: implement queued spinlocks and rwlocks powerpc/pseries: implement paravirt

v3 is updated to use __pv_queued_spin_unlock, noticed by Waiman (thank you). Thanks, Nick Nicholas Piggin (6): powerpc/powernv: must include hvcall.h to get PAPR defines powerpc/pseries: move some PAPR paravirt functions to their own file powerpc: move spinlock implementation to simple_spinlock powerpc/64s: implement queued spinlocks and rwlocks powerpc/pseries: implement paravirt

change fomr v1: a simplier definition of default vcpu_is_preempted skip mahcine type check on ppc, and add config. remove dedicated macro. add one patch to drop overload of rwsem_spin_on_owner and mutex_spin_on_owner. add more comments thanks boqun and Peter's suggestion. This patch set aims to fix lock holder preemption issues. test-case: perf record -a perf bench sched messaging -g

change fomr v1: a simplier definition of default vcpu_is_preempted skip mahcine type check on ppc, and add config. remove dedicated macro. add one patch to drop overload of rwsem_spin_on_owner and mutex_spin_on_owner. add more comments thanks boqun and Peter's suggestion. This patch set aims to fix lock holder preemption issues. test-case: perf record -a perf bench sched messaging -g

Hi All, this is the fairlock patchset. You can apply them and build successfully. patches are based on linux-next qspinlock can avoid waiter starved issue. It has about the same speed in single-thread and it can be much faster in high contention situations especially when the spinlock is embedded within the data structure to be protected. v8 -> v9: mv qspinlocm config entry to

Hi All, this is the fairlock patchset. You can apply them and build successfully. patches are based on linux-next qspinlock can avoid waiter starved issue. It has about the same speed in single-thread and it can be much faster in high contention situations especially when the spinlock is embedded within the data structure to be protected. v8 -> v9: mv qspinlocm config entry to

Hi All, this is the fairlock patchset. You can apply them and build successfully. patches are based on linux-next qspinlock can avoid waiter starved issue. It has about the same speed in single-thread and it can be much faster in high contention situations especially when the spinlock is embedded within the data structure to be protected. v7 -> v8: add one patch to drop a function call

Hi All, this is the fairlock patchset. You can apply them and build successfully. patches are based on linux-next qspinlock can avoid waiter starved issue. It has about the same speed in single-thread and it can be much faster in high contention situations especially when the spinlock is embedded within the data structure to be protected. v7 -> v8: add one patch to drop a function call

...0_setup.c --- a/arch/ppc/platforms/ev64260_setup.c Thu May 22 15:40:37 2003 +++ b/arch/ppc/platforms/ev64260_setup.c Thu May 22 15:40:37 2003 @@ -197,11 +197,7 @@ ROOT_DEV = Root_RAM0; else #endif -#ifdef CONFIG_ROOT_NFS - ROOT_DEV = Root_NFS; -#else ROOT_DEV = Root_SDA2; -#endif if ( ppc_md.progress ) ppc_md.progress("ev64260_setup_arch: find_bridges", 0); diff -Nru a/arch/ppc/platforms/k2_setup.c b/arch/ppc/platforms/k2_setup.c --- a/arch/ppc/platforms/k2_setup.c Thu May 22 15:40:37 2003 +++ b/arch/ppc/platforms/k2_setup.c Thu May 22 15:40:37 2003 @@ -180,11 +180,7 @@...

Hi all, The series is a draft of generic MSI driver that supports PCI and Non-PCI device which have MSI capability. If you're not interested it, sorry for the noise. The series is based on Linux-3.16-rc1. MSI was introduced in PCI Spec 2.2. Currently, kernel MSI driver codes are bonding with PCI device. Because MSI has a lot advantages in design. More and more non-PCI devices want to use