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

[Sebastian Andrzej Siewior]

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

Install the callbacks via the state machine.

Cc: David Woodhouse <dw...@infradead.org>
Cc: Joerg Roedel <j...@8bytes.org>
Cc: io...@lists.linux-foundation.org
Signed-off-by: Anna-Maria Gleixner <anna-ma...@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bige...@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