diff options
Diffstat (limited to 'drivers/perf')
| -rw-r--r-- | drivers/perf/arm_cspmu/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/perf/arm_cspmu/Makefile | 6 | ||||
| -rw-r--r-- | drivers/perf/arm_cspmu/arm_cspmu.c | 168 | ||||
| -rw-r--r-- | drivers/perf/arm_cspmu/arm_cspmu.h | 25 | ||||
| -rw-r--r-- | drivers/perf/arm_cspmu/nvidia_cspmu.c | 34 | ||||
| -rw-r--r-- | drivers/perf/arm_cspmu/nvidia_cspmu.h | 17 |
6 files changed, 199 insertions, 60 deletions
diff --git a/drivers/perf/arm_cspmu/Kconfig b/drivers/perf/arm_cspmu/Kconfig index 25d25ded0983..d5f787d22234 100644 --- a/drivers/perf/arm_cspmu/Kconfig +++ b/drivers/perf/arm_cspmu/Kconfig @@ -1,6 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 # -# Copyright (c) 2022, NVIDIA CORPORATION & AFFILIATES. All rights reserved. +# Copyright (c) 2022-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved. config ARM_CORESIGHT_PMU_ARCH_SYSTEM_PMU tristate "ARM Coresight Architecture PMU" @@ -10,3 +10,10 @@ config ARM_CORESIGHT_PMU_ARCH_SYSTEM_PMU based on ARM CoreSight PMU architecture. Note that this PMU architecture does not have relationship with the ARM CoreSight Self-Hosted Tracing. + +config NVIDIA_CORESIGHT_PMU_ARCH_SYSTEM_PMU + tristate "NVIDIA Coresight Architecture PMU" + depends on ARM_CORESIGHT_PMU_ARCH_SYSTEM_PMU + help + Provides NVIDIA specific attributes for performance monitoring unit + (PMU) devices based on ARM CoreSight PMU architecture. diff --git a/drivers/perf/arm_cspmu/Makefile b/drivers/perf/arm_cspmu/Makefile index fedb17df982d..0309d2ff264a 100644 --- a/drivers/perf/arm_cspmu/Makefile +++ b/drivers/perf/arm_cspmu/Makefile @@ -1,6 +1,8 @@ -# Copyright (c) 2022, NVIDIA CORPORATION & AFFILIATES. All rights reserved. +# Copyright (c) 2022-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved. # # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_ARM_CORESIGHT_PMU_ARCH_SYSTEM_PMU) += arm_cspmu_module.o -arm_cspmu_module-y := arm_cspmu.o nvidia_cspmu.o +arm_cspmu_module-y := arm_cspmu.o + +obj-$(CONFIG_NVIDIA_CORESIGHT_PMU_ARCH_SYSTEM_PMU) += nvidia_cspmu.o diff --git a/drivers/perf/arm_cspmu/arm_cspmu.c b/drivers/perf/arm_cspmu/arm_cspmu.c index e2b7827c4563..c59f1e5a35a3 100644 --- a/drivers/perf/arm_cspmu/arm_cspmu.c +++ b/drivers/perf/arm_cspmu/arm_cspmu.c @@ -16,7 +16,7 @@ * The user should refer to the vendor technical documentation to get details * about the supported events. * - * Copyright (c) 2022, NVIDIA CORPORATION & AFFILIATES. All rights reserved. + * Copyright (c) 2022-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved. * */ @@ -26,11 +26,11 @@ #include <linux/interrupt.h> #include <linux/io-64-nonatomic-lo-hi.h> #include <linux/module.h> +#include <linux/mutex.h> #include <linux/perf_event.h> #include <linux/platform_device.h> #include "arm_cspmu.h" -#include "nvidia_cspmu.h" #define PMUNAME "arm_cspmu" #define DRVNAME "arm-cs-arch-pmu" @@ -112,11 +112,10 @@ */ #define HILOHI_MAX_POLL 1000 -/* JEDEC-assigned JEP106 identification code */ -#define ARM_CSPMU_IMPL_ID_NVIDIA 0x36B - static unsigned long arm_cspmu_cpuhp_state; +static DEFINE_MUTEX(arm_cspmu_lock); + static struct acpi_apmt_node *arm_cspmu_apmt_node(struct device *dev) { return *(struct acpi_apmt_node **)dev_get_platdata(dev); @@ -373,27 +372,37 @@ static struct attribute_group arm_cspmu_cpumask_attr_group = { .attrs = arm_cspmu_cpumask_attrs, }; -struct impl_match { - u32 pmiidr; - u32 mask; - int (*impl_init_ops)(struct arm_cspmu *cspmu); -}; - -static const struct impl_match impl_match[] = { +static struct arm_cspmu_impl_match impl_match[] = { { - .pmiidr = ARM_CSPMU_IMPL_ID_NVIDIA, - .mask = ARM_CSPMU_PMIIDR_IMPLEMENTER, - .impl_init_ops = nv_cspmu_init_ops + .module_name = "nvidia_cspmu", + .pmiidr_val = ARM_CSPMU_IMPL_ID_NVIDIA, + .pmiidr_mask = ARM_CSPMU_PMIIDR_IMPLEMENTER, + .module = NULL, + .impl_init_ops = NULL, }, - {} + {0} }; +static struct arm_cspmu_impl_match *arm_cspmu_impl_match_get(u32 pmiidr) +{ + struct arm_cspmu_impl_match *match = impl_match; + + for (; match->pmiidr_val; match++) { + u32 mask = match->pmiidr_mask; + + if ((match->pmiidr_val & mask) == (pmiidr & mask)) + return match; + } + + return NULL; +} + static int arm_cspmu_init_impl_ops(struct arm_cspmu *cspmu) { - int ret; + int ret = 0; struct arm_cspmu_impl_ops *impl_ops = &cspmu->impl.ops; struct acpi_apmt_node *apmt_node = arm_cspmu_apmt_node(cspmu->dev); - const struct impl_match *match = impl_match; + struct arm_cspmu_impl_match *match; /* * Get PMU implementer and product id from APMT node. @@ -405,17 +414,36 @@ static int arm_cspmu_init_impl_ops(struct arm_cspmu *cspmu) readl(cspmu->base0 + PMIIDR); /* Find implementer specific attribute ops. */ - for (; match->pmiidr; match++) { - const u32 mask = match->mask; + match = arm_cspmu_impl_match_get(cspmu->impl.pmiidr); + + /* Load implementer module and initialize the callbacks. */ + if (match) { + mutex_lock(&arm_cspmu_lock); + + if (match->impl_init_ops) { + /* Prevent unload until PMU registration is done. */ + if (try_module_get(match->module)) { + cspmu->impl.module = match->module; + cspmu->impl.match = match; + ret = match->impl_init_ops(cspmu); + if (ret) + module_put(match->module); + } else { + WARN(1, "arm_cspmu failed to get module: %s\n", + match->module_name); + ret = -EINVAL; + } + } else { + request_module_nowait(match->module_name); + ret = -EPROBE_DEFER; + } - if ((match->pmiidr & mask) == (cspmu->impl.pmiidr & mask)) { - ret = match->impl_init_ops(cspmu); - if (ret) - return ret; + mutex_unlock(&arm_cspmu_lock); - break; - } - } + if (ret) + return ret; + } else + cspmu->impl.module = THIS_MODULE; /* Use default callbacks if implementer doesn't provide one. */ CHECK_DEFAULT_IMPL_OPS(impl_ops, get_event_attrs); @@ -478,11 +506,6 @@ arm_cspmu_alloc_attr_group(struct arm_cspmu *cspmu) struct attribute_group **attr_groups = NULL; struct device *dev = cspmu->dev; const struct arm_cspmu_impl_ops *impl_ops = &cspmu->impl.ops; - int ret; - - ret = arm_cspmu_init_impl_ops(cspmu); - if (ret) - return NULL; cspmu->identifier = impl_ops->get_identifier(cspmu); cspmu->name = impl_ops->get_name(cspmu); @@ -1149,7 +1172,7 @@ static int arm_cspmu_register_pmu(struct arm_cspmu *cspmu) cspmu->pmu = (struct pmu){ .task_ctx_nr = perf_invalid_context, - .module = THIS_MODULE, + .module = cspmu->impl.module, .pmu_enable = arm_cspmu_enable, .pmu_disable = arm_cspmu_disable, .event_init = arm_cspmu_event_init, @@ -1196,11 +1219,17 @@ static int arm_cspmu_device_probe(struct platform_device *pdev) if (ret) return ret; - ret = arm_cspmu_register_pmu(cspmu); + ret = arm_cspmu_init_impl_ops(cspmu); if (ret) return ret; - return 0; + ret = arm_cspmu_register_pmu(cspmu); + + /* Matches arm_cspmu_init_impl_ops() above. */ + if (cspmu->impl.module != THIS_MODULE) + module_put(cspmu->impl.module); + + return ret; } static int arm_cspmu_device_remove(struct platform_device *pdev) @@ -1300,6 +1329,75 @@ static void __exit arm_cspmu_exit(void) cpuhp_remove_multi_state(arm_cspmu_cpuhp_state); } +int arm_cspmu_impl_register(const struct arm_cspmu_impl_match *impl_match) +{ + struct arm_cspmu_impl_match *match; + int ret = 0; + + match = arm_cspmu_impl_match_get(impl_match->pmiidr_val); + + if (match) { + mutex_lock(&arm_cspmu_lock); + + if (!match->impl_init_ops) { + match->module = impl_match->module; + match->impl_init_ops = impl_match->impl_init_ops; + } else { + /* Broken match table may contain non-unique entries */ + WARN(1, "arm_cspmu backend already registered for module: %s, pmiidr: 0x%x, mask: 0x%x\n", + match->module_name, + match->pmiidr_val, + match->pmiidr_mask); + + ret = -EINVAL; + } + + mutex_unlock(&arm_cspmu_lock); + + if (!ret) + ret = driver_attach(&arm_cspmu_driver.driver); + } else { + pr_err("arm_cspmu reg failed, unable to find a match for pmiidr: 0x%x\n", + impl_match->pmiidr_val); + + ret = -EINVAL; + } + + return ret; +} +EXPORT_SYMBOL_GPL(arm_cspmu_impl_register); + +static int arm_cspmu_match_device(struct device *dev, const void *match) +{ + struct arm_cspmu *cspmu = platform_get_drvdata(to_platform_device(dev)); + + return (cspmu && cspmu->impl.match == match) ? 1 : 0; +} + +void arm_cspmu_impl_unregister(const struct arm_cspmu_impl_match *impl_match) +{ + struct device *dev; + struct arm_cspmu_impl_match *match; + + match = arm_cspmu_impl_match_get(impl_match->pmiidr_val); + + if (WARN_ON(!match)) + return; + + /* Unbind the driver from all matching backend devices. */ + while ((dev = driver_find_device(&arm_cspmu_driver.driver, NULL, + match, arm_cspmu_match_device))) + device_release_driver(dev); + + mutex_lock(&arm_cspmu_lock); + + match->module = NULL; + match->impl_init_ops = NULL; + + mutex_unlock(&arm_cspmu_lock); +} +EXPORT_SYMBOL_GPL(arm_cspmu_impl_unregister); + module_init(arm_cspmu_init); module_exit(arm_cspmu_exit); diff --git a/drivers/perf/arm_cspmu/arm_cspmu.h b/drivers/perf/arm_cspmu/arm_cspmu.h index 83df53d1c132..7936a90ded7f 100644 --- a/drivers/perf/arm_cspmu/arm_cspmu.h +++ b/drivers/perf/arm_cspmu/arm_cspmu.h @@ -1,7 +1,7 @@ /* SPDX-License-Identifier: GPL-2.0 * * ARM CoreSight Architecture PMU driver. - * Copyright (c) 2022, NVIDIA CORPORATION & AFFILIATES. All rights reserved. + * Copyright (c) 2022-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved. * */ @@ -69,6 +69,9 @@ #define ARM_CSPMU_PMIIDR_IMPLEMENTER GENMASK(11, 0) #define ARM_CSPMU_PMIIDR_PRODUCTID GENMASK(31, 20) +/* JEDEC-assigned JEP106 identification code */ +#define ARM_CSPMU_IMPL_ID_NVIDIA 0x36B + struct arm_cspmu; /* This tracks the events assigned to each counter in the PMU. */ @@ -106,9 +109,23 @@ struct arm_cspmu_impl_ops { struct attribute *attr, int unused); }; +/* Vendor/implementer registration parameter. */ +struct arm_cspmu_impl_match { + /* Backend module. */ + struct module *module; + const char *module_name; + /* PMIIDR value/mask. */ + u32 pmiidr_val; + u32 pmiidr_mask; + /* Callback to vendor backend to init arm_cspmu_impl::ops. */ + int (*impl_init_ops)(struct arm_cspmu *cspmu); +}; + /* Vendor/implementer descriptor. */ struct arm_cspmu_impl { u32 pmiidr; + struct module *module; + struct arm_cspmu_impl_match *match; struct arm_cspmu_impl_ops ops; void *ctx; }; @@ -147,4 +164,10 @@ ssize_t arm_cspmu_sysfs_format_show(struct device *dev, struct device_attribute *attr, char *buf); +/* Register vendor backend. */ +int arm_cspmu_impl_register(const struct arm_cspmu_impl_match *impl_match); + +/* Unregister vendor backend. */ +void arm_cspmu_impl_unregister(const struct arm_cspmu_impl_match *impl_match); + #endif /* __ARM_CSPMU_H__ */ diff --git a/drivers/perf/arm_cspmu/nvidia_cspmu.c b/drivers/perf/arm_cspmu/nvidia_cspmu.c index 72ef80caa3c8..0382b702f092 100644 --- a/drivers/perf/arm_cspmu/nvidia_cspmu.c +++ b/drivers/perf/arm_cspmu/nvidia_cspmu.c @@ -1,14 +1,15 @@ // SPDX-License-Identifier: GPL-2.0 /* - * Copyright (c) 2022, NVIDIA CORPORATION & AFFILIATES. All rights reserved. + * Copyright (c) 2022-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved. * */ /* Support for NVIDIA specific attributes. */ +#include <linux/module.h> #include <linux/topology.h> -#include "nvidia_cspmu.h" +#include "arm_cspmu.h" #define NV_PCIE_PORT_COUNT 10ULL #define NV_PCIE_FILTER_ID_MASK GENMASK_ULL(NV_PCIE_PORT_COUNT - 1, 0) @@ -351,7 +352,7 @@ static char *nv_cspmu_format_name(const struct arm_cspmu *cspmu, return name; } -int nv_cspmu_init_ops(struct arm_cspmu *cspmu) +static int nv_cspmu_init_ops(struct arm_cspmu *cspmu) { u32 prodid; struct nv_cspmu_ctx *ctx; @@ -395,6 +396,31 @@ int nv_cspmu_init_ops(struct arm_cspmu *cspmu) return 0; } -EXPORT_SYMBOL_GPL(nv_cspmu_init_ops); + +/* Match all NVIDIA Coresight PMU devices */ +static const struct arm_cspmu_impl_match nv_cspmu_param = { + .pmiidr_val = ARM_CSPMU_IMPL_ID_NVIDIA, + .module = THIS_MODULE, + .impl_init_ops = nv_cspmu_init_ops +}; + +static int __init nvidia_cspmu_init(void) +{ + int ret; + + ret = arm_cspmu_impl_register(&nv_cspmu_param); + if (ret) + pr_err("nvidia_cspmu backend registration error: %d\n", ret); + + return ret; +} + +static void __exit nvidia_cspmu_exit(void) +{ + arm_cspmu_impl_unregister(&nv_cspmu_param); +} + +module_init(nvidia_cspmu_init); +module_exit(nvidia_cspmu_exit); MODULE_LICENSE("GPL v2"); diff --git a/drivers/perf/arm_cspmu/nvidia_cspmu.h b/drivers/perf/arm_cspmu/nvidia_cspmu.h deleted file mode 100644 index 71e18f0dc50b..000000000000 --- a/drivers/perf/arm_cspmu/nvidia_cspmu.h +++ /dev/null @@ -1,17 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 - * - * Copyright (c) 2022, NVIDIA CORPORATION & AFFILIATES. All rights reserved. - * - */ - -/* Support for NVIDIA specific attributes. */ - -#ifndef __NVIDIA_CSPMU_H__ -#define __NVIDIA_CSPMU_H__ - -#include "arm_cspmu.h" - -/* Allocate NVIDIA descriptor. */ -int nv_cspmu_init_ops(struct arm_cspmu *cspmu); - -#endif /* __NVIDIA_CSPMU_H__ */ |