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[PATCH 13/22] iommu/vt-d: Convert to hotplug state machine

From Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Newsgroups linux.kernel
Subject [PATCH 13/22] iommu/vt-d: Convert to hotplug state machine
Date 2016-11-27 00:20 +0100
Message-ID <sHUqe-4EY-37@gated-at.bofh.it> (permalink)
References <sHUqd-4EY-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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From: Anna-Maria Gleixner <anna-maria@linutronix.de>

Install the callbacks via the state machine.

Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: iommu@lists.linux-foundation.org
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/iommu/intel-iommu.c | 24 ++++++------------------
 include/linux/cpuhotplug.h  |  1 +
 2 files changed, 7 insertions(+), 18 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index a4407eabf0e6..fd7962560e56 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -4665,25 +4665,13 @@ static void free_all_cpu_cached_iovas(unsigned int cpu)
 	}
 }
 
-static int intel_iommu_cpu_notifier(struct notifier_block *nfb,
-				    unsigned long action, void *v)
+static int intel_iommu_cpu_dead(unsigned int cpu)
 {
-	unsigned int cpu = (unsigned long)v;
-
-	switch (action) {
-	case CPU_DEAD:
-	case CPU_DEAD_FROZEN:
-		free_all_cpu_cached_iovas(cpu);
-		flush_unmaps_timeout(cpu);
-		break;
-	}
-	return NOTIFY_OK;
+	free_all_cpu_cached_iovas(cpu);
+	flush_unmaps_timeout(cpu);
+	return 0;
 }
 
-static struct notifier_block intel_iommu_cpu_nb = {
-	.notifier_call = intel_iommu_cpu_notifier,
-};
-
 static ssize_t intel_iommu_show_version(struct device *dev,
 					struct device_attribute *attr,
 					char *buf)
@@ -4832,8 +4820,8 @@ int __init intel_iommu_init(void)
 	bus_register_notifier(&pci_bus_type, &device_nb);
 	if (si_domain && !hw_pass_through)
 		register_memory_notifier(&intel_iommu_memory_nb);
-	register_hotcpu_notifier(&intel_iommu_cpu_nb);
-
+	cpuhp_setup_state(CPUHP_IOMMU_INTEL_DEAD, "iommu/intel:dead", NULL,
+			  intel_iommu_cpu_dead);
 	intel_iommu_enabled = 1;
 
 	return 0;
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index c7d0d76ef0ee..853f8176594d 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -40,6 +40,7 @@ enum cpuhp_state {
 	CPUHP_PAGE_ALLOC_DEAD,
 	CPUHP_NET_DEV_DEAD,
 	CPUHP_PCI_XGENE_DEAD,
+	CPUHP_IOMMU_INTEL_DEAD,
 	CPUHP_WORKQUEUE_PREP,
 	CPUHP_POWER_NUMA_PREPARE,
 	CPUHP_HRTIMERS_PREPARE,
-- 
2.10.2

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Thread

cpu hotplug: convert more drivers (batch #6 and last) Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-27 00:20 +0100
  [PATCH 01/22] cpufreq/acpi-cpufreq: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-27 00:20 +0100
    Re: [PATCH 01/22] cpufreq/acpi-cpufreq: Convert to hotplug state  machine Viresh Kumar <viresh.kumar@linaro.org> - 2016-11-28 06:20 +0100
      Re: [PATCH 01/22] cpufreq/acpi-cpufreq: Convert to hotplug state  machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-28 10:50 +0100
        [PATCH 01/22 v2] cpufreq/acpi-cpufreq: Convert to hotplug state  machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-28 11:00 +0100
          Re: [PATCH 01/22 v2] cpufreq/acpi-cpufreq: Convert to hotplug state  machine Viresh Kumar <viresh.kumar@linaro.org> - 2016-11-28 11:00 +0100
          Re: [PATCH 01/22 v2] cpufreq/acpi-cpufreq: Convert to hotplug state machine "Rafael J. Wysocki" <rafael@kernel.org> - 2016-11-28 13:50 +0100
  [PATCH 13/22] iommu/vt-d: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-27 00:20 +0100
    [tip:smp/hotplug] iommu/vt-d: Convert to hotplug state machine tip-bot for Anna-Maria Gleixner <tipbot@zytor.com> - 2016-12-02 01:20 +0100
  [PATCH 11/22] mm/zswap: Convert dst-mem to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-27 00:20 +0100
    [tip:smp/hotplug] mm/zswap: Convert dst-mem to hotplug state  machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-12-02 01:20 +0100
  [PATCH 19/22] soc/fsl/qbman: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-27 00:20 +0100
    [tip:smp/hotplug] soc/fsl/qbman: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-12-02 01:20 +0100
  [PATCH 04/22] idle/intel: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-27 00:20 +0100
    Re: [PATCH 04/22] idle/intel: Convert to hotplug state machine Thomas Gleixner <tglx@linutronix.de> - 2016-11-28 18:40 +0100
      Re: [PATCH 04/22] idle/intel: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-29 10:50 +0100
        [PATCH 04/22 v2] idle/intel: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-29 11:00 +0100
  [PATCH 07/22] mm/vmstat: Drop get_online_cpus() from init_cpu_node_state/vmstat_cpu_dead() Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-27 00:20 +0100
    Re: [PATCH 07/22] mm/vmstat: Drop get_online_cpus() from  init_cpu_node_state/vmstat_cpu_dead() Michal Hocko <mhocko@kernel.org> - 2016-11-28 10:30 +0100
    [tip:smp/hotplug] mm/vmstat: Drop get_online_cpus() from  init_cpu_node_state/vmstat_cpu_dead() tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-12-02 01:20 +0100
  [PATCH 03/22] idle/intel: Remove superfluous SMP fuction call Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-27 00:20 +0100
  [PATCH 06/22] tracing/rb: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-27 00:20 +0100
    [tip:smp/hotplug] tracing/rb: Convert to hotplug state machine tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-12-02 01:20 +0100
      [linux-next] tracing/rb: NULL pointer dereference at  trace_rb_cpu_prepare() Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2016-12-07 12:20 +0100
        [PATCH] tracing/rb: init the CPU mask on allocation Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-12-07 14:40 +0100
          [tip:smp/hotplug] tracing/rb: Init the CPU mask on allocation tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-12-07 14:50 +0100
          Re: [PATCH] tracing/rb: init the CPU mask on allocation Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2016-12-07 15:40 +0100
  [PATCH 16/22] arm64/cpuinfo: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-27 00:20 +0100
    Re: [PATCH 16/22] arm64/cpuinfo: Convert to hotplug state machine Suzuki K Poulose <suzuki.poulose@arm.com> - 2016-11-29 18:30 +0100
    [tip:smp/hotplug] arm64/cpuinfo: Convert to hotplug state machine tip-bot for Anna-Maria Gleixner <tipbot@zytor.com> - 2016-12-02 01:20 +0100
  [PATCH 22/22] Remove obsolete cpu hotplug register / unregister functions Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-27 00:20 +0100
  [PATCH 18/22] zram: Convert to hotplug state machine Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-27 00:20 +0100
    [tip:smp/hotplug] zram: Convert to hotplug state machine tip-bot for Anna-Maria Gleixner <tipbot@zytor.com> - 2016-12-02 01:20 +0100

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