1 files changed, 10 insertions, 123 deletions

diff --git a/arch/arm/kernel/pmu.c b/arch/arm/kernel/pmu.c
index 2c79eec..2c3407e 100644
--- a/arch/arm/kernel/pmu.c
+++ b/arch/arm/kernel/pmu.c
@@ -10,139 +10,26 @@
  *
  */
 
-#define pr_fmt(fmt) "PMU: " fmt
-
-#include <linux/cpumask.h>
 #include <linux/err.h>
-#include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/platform_device.h>
 
 #include <asm/pmu.h>
 
-static volatile long pmu_lock;
-
-static struct platform_device *pmu_devices[ARM_NUM_PMU_DEVICES];
-
-static int __devinit pmu_device_probe(struct platform_device *pdev)
-{
-
-	if (pdev->id < 0 || pdev->id >= ARM_NUM_PMU_DEVICES) {
-		pr_warning("received registration request for unknown "
-				"device %d\n", pdev->id);
-		return -EINVAL;
-	}
-
-	if (pmu_devices[pdev->id])
-		pr_warning("registering new PMU device type %d overwrites "
-				"previous registration!\n", pdev->id);
-	else
-		pr_info("registered new PMU device of type %d\n",
-				pdev->id);
-
-	pmu_devices[pdev->id] = pdev;
-	return 0;
-}
-
-static struct platform_driver pmu_driver = {
-	.driver		= {
-		.name	= "arm-pmu",
-	},
-	.probe		= pmu_device_probe,
-};
-
-static int __init register_pmu_driver(void)
-{
-	return platform_driver_register(&pmu_driver);
-}
-device_initcall(register_pmu_driver);
-
-struct platform_device *
-reserve_pmu(enum arm_pmu_type device)
-{
-	struct platform_device *pdev;
-
-	if (test_and_set_bit_lock(device, &pmu_lock)) {
-		pdev = ERR_PTR(-EBUSY);
-	} else if (pmu_devices[device] == NULL) {
-		clear_bit_unlock(device, &pmu_lock);
-		pdev = ERR_PTR(-ENODEV);
-	} else {
-		pdev = pmu_devices[device];
-	}
-
-	return pdev;
-}
-EXPORT_SYMBOL_GPL(reserve_pmu);
+/*
+ * PMU locking to ensure mutual exclusion between different subsystems.
+ */
+static unsigned long pmu_lock[BITS_TO_LONGS(ARM_NUM_PMU_DEVICES)];
 
 int
-release_pmu(struct platform_device *pdev)
-{
-	if (WARN_ON(pdev != pmu_devices[pdev->id]))
-		return -EINVAL;
-	clear_bit_unlock(pdev->id, &pmu_lock);
-	return 0;
-}
-EXPORT_SYMBOL_GPL(release_pmu);
-
-static int
-set_irq_affinity(int irq,
-		 unsigned int cpu)
+reserve_pmu(enum arm_pmu_type type)
 {
-#ifdef CONFIG_SMP
-	int err = irq_set_affinity(irq, cpumask_of(cpu));
-	if (err)
-		pr_warning("unable to set irq affinity (irq=%d, cpu=%u)\n",
-			   irq, cpu);
-	return err;
-#else
-	return -EINVAL;
-#endif
-}
-
-static int
-init_cpu_pmu(void)
-{
-	int i, irqs, err = 0;
-	struct platform_device *pdev = pmu_devices[ARM_PMU_DEVICE_CPU];
-
-	if (!pdev)
-		return -ENODEV;
-
-	irqs = pdev->num_resources;
-
-	/*
-	 * If we have a single PMU interrupt that we can't shift, assume that
-	 * we're running on a uniprocessor machine and continue.
-	 */
-	if (irqs == 1 && !irq_can_set_affinity(platform_get_irq(pdev, 0)))
-		return 0;
-
-	for (i = 0; i < irqs; ++i) {
-		err = set_irq_affinity(platform_get_irq(pdev, i), i);
-		if (err)
-			break;
-	}
-
-	return err;
+	return test_and_set_bit_lock(type, pmu_lock) ? -EBUSY : 0;
 }
+EXPORT_SYMBOL_GPL(reserve_pmu);
 
-int
-init_pmu(enum arm_pmu_type device)
+void
+release_pmu(enum arm_pmu_type type)
 {
-	int err = 0;
-
-	switch (device) {
-	case ARM_PMU_DEVICE_CPU:
-		err = init_cpu_pmu();
-		break;
-	default:
-		pr_warning("attempt to initialise unknown device %d\n",
-				device);
-		err = -EINVAL;
-	}
-
-	return err;
+	clear_bit_unlock(type, pmu_lock);
 }
-EXPORT_SYMBOL_GPL(init_pmu);