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[PATCH v6 3/9] x86/topology: Define x86's arch_update_cpu_topology

From Tim Chen <tim.c.chen@linux.intel.com>
Newsgroups linux.kernel
Subject [PATCH v6 3/9] x86/topology: Define x86's arch_update_cpu_topology
Date 2016-10-21 00:10 +0200
Message-ID <sutHb-52m-13@gated-at.bofh.it> (permalink)
References <sutHb-52m-11@gated-at.bofh.it>
Organization linux.* mail to news gateway

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The scheduler calls arch_update_cpu_topology() to check whether the
scheduler domains have to be rebuilt.

So far x86 has no requirement for this, but the upcoming ITMT support
makes this necessary.

Request the rebuild when the x86 internal update flag is set.

Suggested-by: Morten Rasmussen <morten.rasmussen@arm.com>
Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
 arch/x86/include/asm/topology.h |  1 +
 arch/x86/kernel/smpboot.c       | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index 3e95dfc..323f61f 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -149,4 +149,5 @@ struct pci_bus;
 int x86_pci_root_bus_node(int bus);
 void x86_pci_root_bus_resources(int bus, struct list_head *resources);
 
+extern bool x86_topology_update;
 #endif /* _ASM_X86_TOPOLOGY_H */
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 4234e52..ebd2655 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -109,6 +109,17 @@ static bool logical_packages_frozen __read_mostly;
 /* Maximum number of SMT threads on any online core */
 int __max_smt_threads __read_mostly;
 
+/* Flag to indicate if a complete sched domain rebuild is required */
+bool x86_topology_update;
+
+int arch_update_cpu_topology(void)
+{
+	int retval = x86_topology_update;
+
+	x86_topology_update = false;
+	return retval;
+}
+
 static inline void smpboot_setup_warm_reset_vector(unsigned long start_eip)
 {
 	unsigned long flags;
-- 
2.5.5

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[PATCH v6 0/9] Support Intel® Turbo Boost Max Technology 3.0 Tim Chen <tim.c.chen@linux.intel.com> - 2016-10-21 00:10 +0200
  [PATCH v6 8/9] acpi: bus: Set _OSC for diverse core support Tim Chen <tim.c.chen@linux.intel.com> - 2016-10-21 00:10 +0200
  [PATCH v6 2/9] x86/topology: Provide topology_num_packages() Tim Chen <tim.c.chen@linux.intel.com> - 2016-10-21 00:10 +0200
  [PATCH v6 4/9] x86: Enable Intel Turbo Boost Max Technology 3.0 Tim Chen <tim.c.chen@linux.intel.com> - 2016-10-21 00:10 +0200
  [PATCH v6 3/9] x86/topology: Define x86's arch_update_cpu_topology Tim Chen <tim.c.chen@linux.intel.com> - 2016-10-21 00:10 +0200
  [PATCH v6 5/9] x86/sysctl: Add sysctl for ITMT scheduling feature Tim Chen <tim.c.chen@linux.intel.com> - 2016-10-21 00:10 +0200
    Re: [PATCH v6 5/9] x86/sysctl: Add sysctl for ITMT scheduling  feature Thomas Gleixner <tglx@linutronix.de> - 2016-10-26 13:00 +0200
      Re: [PATCH v6 5/9] x86/sysctl: Add sysctl for ITMT scheduling  feature Tim Chen <tim.c.chen@linux.intel.com> - 2016-10-26 20:10 +0200
        Re: [PATCH v6 5/9] x86/sysctl: Add sysctl for ITMT scheduling  feature Thomas Gleixner <tglx@linutronix.de> - 2016-10-26 20:20 +0200
          Re: [PATCH v6 5/9] x86/sysctl: Add sysctl for ITMT scheduling  feature Tim Chen <tim.c.chen@linux.intel.com> - 2016-10-26 21:40 +0200
    Re: [PATCH v6 5/9] x86/sysctl: Add sysctl for ITMT scheduling  feature Thomas Gleixner <tglx@linutronix.de> - 2016-10-26 13:00 +0200
      Re: [PATCH v6 5/9] x86/sysctl: Add sysctl for ITMT scheduling  feature Thomas Gleixner <tglx@linutronix.de> - 2016-10-26 13:30 +0200
        Re: [PATCH v6 5/9] x86/sysctl: Add sysctl for ITMT scheduling  feature Tim Chen <tim.c.chen@linux.intel.com> - 2016-10-26 19:30 +0200
          Re: [PATCH v6 5/9] x86/sysctl: Add sysctl for ITMT scheduling  feature Thomas Gleixner <tglx@linutronix.de> - 2016-10-26 20:20 +0200
      Re: [PATCH v6 5/9] x86/sysctl: Add sysctl for ITMT scheduling feature Peter Zijlstra <peterz@infradead.org> - 2016-10-26 13:30 +0200
      Re: [PATCH v6 5/9] x86/sysctl: Add sysctl for ITMT scheduling  feature Tim Chen <tim.c.chen@linux.intel.com> - 2016-10-26 20:10 +0200
  [PATCH v6 1/9] sched: Extend scheduler's asym packing Tim Chen <tim.c.chen@linux.intel.com> - 2016-10-21 00:10 +0200
    Re: [PATCH v6 1/9] sched: Extend scheduler's asym packing Thomas Gleixner <tglx@linutronix.de> - 2016-10-26 12:40 +0200
      Re: [PATCH v6 1/9] sched: Extend scheduler's asym packing Tim Chen <tim.c.chen@linux.intel.com> - 2016-10-26 20:20 +0200
        Re: [PATCH v6 1/9] sched: Extend scheduler's asym packing Thomas Gleixner <tglx@linutronix.de> - 2016-10-26 20:30 +0200
  [PATCH v6 7/9] acpi: bus: Enable HWP CPPC objects Tim Chen <tim.c.chen@linux.intel.com> - 2016-10-21 00:10 +0200
  [PATCH v6 9/9] cpufreq: intel_pstate: Use CPPC to get max performance Tim Chen <tim.c.chen@linux.intel.com> - 2016-10-21 00:10 +0200
  [PATCH v6 6/9] x86/sched: Add SD_ASYM_PACKING flags to x86 ITMT CPU Tim Chen <tim.c.chen@linux.intel.com> - 2016-10-21 00:10 +0200

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