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Date: Tue, 22 Nov 2016 14:47:41 -0800 From: tip-bot for Sebastian Andrzej Siewior <tipbot@...or.com> To: linux-tip-commits@...r.kernel.org Cc: mingo@...nel.org, linux-kernel@...r.kernel.org, tglx@...utronix.de, bhelgaas@...gle.com, bigeasy@...utronix.de, hpa@...or.com Subject: [tip:smp/hotplug] x86/pci/amd-bus: Convert to hotplug state machine Commit-ID: c8b877a5e58a132c5efb05f0c404585b9789fe5c Gitweb: http://git.kernel.org/tip/c8b877a5e58a132c5efb05f0c404585b9789fe5c Author: Sebastian Andrzej Siewior <bigeasy@...utronix.de> AuthorDate: Thu, 17 Nov 2016 19:35:41 +0100 Committer: Thomas Gleixner <tglx@...utronix.de> CommitDate: Tue, 22 Nov 2016 23:34:43 +0100 x86/pci/amd-bus: Convert to hotplug state machine Install the callbacks via the state machine and let the core invoke the callbacks on the already online CPUs. The smp_call_function_single() is dropped because the ONLINE callback is invoked on the target CPU since commit 1cf4f629d9d2 ("cpu/hotplug: Move online calls to hotplugged cpu"). smp_call_function_single() invokes the invoked function with interrupts disabled, but this calling convention is not preserved as the MSR is not modified by anything else than this code. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de> Cc: Bjorn Helgaas <bhelgaas@...gle.com> Cc: linux-pci@...r.kernel.org Cc: rt@...uxtronix.de Link: http://lkml.kernel.org/r/20161117183541.8588-21-bigeasy@linutronix.de Signed-off-by: Thomas Gleixner <tglx@...utronix.de> --- arch/x86/pci/amd_bus.c | 34 +++++++--------------------------- 1 file changed, 7 insertions(+), 27 deletions(-) diff --git a/arch/x86/pci/amd_bus.c b/arch/x86/pci/amd_bus.c index c20d2cc..ae387e5 100644 --- a/arch/x86/pci/amd_bus.c +++ b/arch/x86/pci/amd_bus.c @@ -327,35 +327,18 @@ static int __init early_root_info_init(void) #define ENABLE_CF8_EXT_CFG (1ULL << 46) -static void enable_pci_io_ecs(void *unused) +static int amd_bus_cpu_online(unsigned int cpu) { u64 reg; + rdmsrl(MSR_AMD64_NB_CFG, reg); if (!(reg & ENABLE_CF8_EXT_CFG)) { reg |= ENABLE_CF8_EXT_CFG; wrmsrl(MSR_AMD64_NB_CFG, reg); } + return 0; } -static int amd_cpu_notify(struct notifier_block *self, unsigned long action, - void *hcpu) -{ - int cpu = (long)hcpu; - switch (action) { - case CPU_ONLINE: - case CPU_ONLINE_FROZEN: - smp_call_function_single(cpu, enable_pci_io_ecs, NULL, 0); - break; - default: - break; - } - return NOTIFY_OK; -} - -static struct notifier_block amd_cpu_notifier = { - .notifier_call = amd_cpu_notify, -}; - static void __init pci_enable_pci_io_ecs(void) { #ifdef CONFIG_AMD_NB @@ -385,7 +368,7 @@ static void __init pci_enable_pci_io_ecs(void) static int __init pci_io_ecs_init(void) { - int cpu; + int ret; /* assume all cpus from fam10h have IO ECS */ if (boot_cpu_data.x86 < 0x10) @@ -395,12 +378,9 @@ static int __init pci_io_ecs_init(void) if (early_pci_allowed()) pci_enable_pci_io_ecs(); - cpu_notifier_register_begin(); - for_each_online_cpu(cpu) - amd_cpu_notify(&amd_cpu_notifier, (unsigned long)CPU_ONLINE, - (void *)(long)cpu); - __register_cpu_notifier(&amd_cpu_notifier); - cpu_notifier_register_done(); + ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "pci/amd_bus:online", + amd_bus_cpu_online, NULL); + WARN_ON(ret < 0); pci_probe |= PCI_HAS_IO_ECS;
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