linux-kernel - [tip:smp/hotplug] x86/pci/amd-bus: Convert to hotplug state machine

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Message-ID: <tip-57b85d6eb29b289722d2c85c0ff025618c7fe700@git.kernel.org>
Date:   Mon, 21 Nov 2016 07:55:33 -0800
From:   tip-bot for Sebastian Andrzej Siewior <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     bigeasy@...utronix.de, hpa@...or.com, bhelgaas@...gle.com,
        linux-kernel@...r.kernel.org, mingo@...nel.org, tglx@...utronix.de
Subject: [tip:smp/hotplug] x86/pci/amd-bus: Convert to hotplug state machine

Commit-ID:  57b85d6eb29b289722d2c85c0ff025618c7fe700
Gitweb:     http://git.kernel.org/tip/57b85d6eb29b289722d2c85c0ff025618c7fe700
Author:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
AuthorDate: Thu, 17 Nov 2016 19:35:41 +0100
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Mon, 21 Nov 2016 16:37:09 +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;