From f12482c9393da2c1f5cb3217f29aa79c653dd980 Mon Sep 17 00:00:00 2001 From: Mark Rutland Date: Wed, 22 Jun 2011 15:30:51 +0100 Subject: [PATCH] ARM: 6974/1: pmu: refactor reservation Currently, PMU platform_device reservation relies on some minor abuse of the platform_device::id field for determining the type of PMU. This is problematic for device tree based probing, where the ID cannot be controlled. This patch removes reliance on the id field, and depends on each PMU's platform driver to figure out which type it is. As all PMUs handled by the current platform_driver name "arm-pmu" are CPU PMUs, this convention is hardcoded. New PMU types can be supported through the use of {of,platform}_device_id tables Signed-off-by: Mark Rutland Acked-by: Jamie Iles Acked-by: Will Deacon Cc: Rob Herring Cc: Mathieu Desnoyers Signed-off-by: Russell King --- arch/arm/include/asm/pmu.h | 2 +- arch/arm/kernel/perf_event.c | 4 ++-- arch/arm/kernel/pmu.c | 33 +++++++++++++++++++-------------- 3 files changed, 22 insertions(+), 17 deletions(-) diff --git a/arch/arm/include/asm/pmu.h b/arch/arm/include/asm/pmu.h index 7544ce6b481a..67c70a31a1be 100644 --- a/arch/arm/include/asm/pmu.h +++ b/arch/arm/include/asm/pmu.h @@ -52,7 +52,7 @@ reserve_pmu(enum arm_pmu_type device); * a cookie. */ extern int -release_pmu(struct platform_device *pdev); +release_pmu(enum arm_pmu_type type); /** * init_pmu() - Initialise the PMU. diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c index d53c0abc4dd3..a6c643f2d2ca 100644 --- a/arch/arm/kernel/perf_event.c +++ b/arch/arm/kernel/perf_event.c @@ -435,7 +435,7 @@ armpmu_reserve_hardware(void) if (irq >= 0) free_irq(irq, NULL); } - release_pmu(pmu_device); + release_pmu(ARM_PMU_DEVICE_CPU); pmu_device = NULL; } @@ -454,7 +454,7 @@ armpmu_release_hardware(void) } armpmu->stop(); - release_pmu(pmu_device); + release_pmu(ARM_PMU_DEVICE_CPU); pmu_device = NULL; } diff --git a/arch/arm/kernel/pmu.c b/arch/arm/kernel/pmu.c index 2c79eec19262..87942b931c62 100644 --- a/arch/arm/kernel/pmu.c +++ b/arch/arm/kernel/pmu.c @@ -25,36 +25,41 @@ 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) +static int __devinit pmu_register(struct platform_device *pdev, + enum arm_pmu_type type) { - - if (pdev->id < 0 || pdev->id >= ARM_NUM_PMU_DEVICES) { + if (type < 0 || type >= ARM_NUM_PMU_DEVICES) { pr_warning("received registration request for unknown " - "device %d\n", pdev->id); + "device %d\n", type); return -EINVAL; } - if (pmu_devices[pdev->id]) + if (pmu_devices[type]) pr_warning("registering new PMU device type %d overwrites " - "previous registration!\n", pdev->id); + "previous registration!\n", type); else pr_info("registered new PMU device of type %d\n", - pdev->id); + type); - pmu_devices[pdev->id] = pdev; + pmu_devices[type] = pdev; return 0; } -static struct platform_driver pmu_driver = { +static int __devinit armpmu_device_probe(struct platform_device *pdev) +{ + return pmu_register(pdev, ARM_PMU_DEVICE_CPU); +} + +static struct platform_driver armpmu_driver = { .driver = { .name = "arm-pmu", }, - .probe = pmu_device_probe, + .probe = armpmu_device_probe, }; static int __init register_pmu_driver(void) { - return platform_driver_register(&pmu_driver); + return platform_driver_register(&armpmu_driver); } device_initcall(register_pmu_driver); @@ -77,11 +82,11 @@ reserve_pmu(enum arm_pmu_type device) EXPORT_SYMBOL_GPL(reserve_pmu); int -release_pmu(struct platform_device *pdev) +release_pmu(enum arm_pmu_type device) { - if (WARN_ON(pdev != pmu_devices[pdev->id])) + if (WARN_ON(!pmu_devices[device])) return -EINVAL; - clear_bit_unlock(pdev->id, &pmu_lock); + clear_bit_unlock(device, &pmu_lock); return 0; } EXPORT_SYMBOL_GPL(release_pmu); -- 2.20.1