Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 328 insertions, 0 deletions

diff --git a/drivers/perf/Kconfig b/drivers/perf/Kconfig
new file mode 100644
index 000000000..245e7bb76
--- /dev/null
+++ b/drivers/perf/Kconfig
@@ -0,0 +1,328 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Performance Monitor Drivers
+#
+
+menu "Performance monitor support"
+	depends on PERF_EVENTS
+
+config ARM_CCI_PMU
+	tristate "ARM CCI PMU driver"
+	depends on (ARM && CPU_V7) || ARM64
+	select ARM_CCI
+	help
+	  Support for PMU events monitoring on the ARM CCI (Cache Coherent
+	  Interconnect) family of products.
+
+	  If compiled as a module, it will be called arm-cci.
+
+config ARM_CCI400_PMU
+	bool "support CCI-400"
+	default y
+	depends on ARM_CCI_PMU
+	select ARM_CCI400_COMMON
+	help
+	  CCI-400 provides 4 independent event counters counting events related
+	  to the connected slave/master interfaces, plus a cycle counter.
+
+config ARM_CCI5xx_PMU
+	bool "support CCI-500/CCI-550"
+	default y
+	depends on ARM_CCI_PMU
+	help
+	  CCI-500/CCI-550 both provide 8 independent event counters, which can
+	  count events pertaining to the slave/master interfaces as well as the
+	  internal events to the CCI.
+
+config ARM_CCN
+	tristate "ARM CCN driver support"
+	depends on ARM || ARM64 || COMPILE_TEST
+	help
+	  PMU (perf) driver supporting the ARM CCN (Cache Coherent Network)
+	  interconnect.
+
+config ARM_CMN
+	tristate "Arm CMN-600 PMU support"
+	depends on ARM64 || COMPILE_TEST
+	help
+	  Support for PMU events monitoring on the Arm CMN-600 Coherent Mesh
+	  Network interconnect.
+
+config ARM_NI
+	tristate "Arm NI-700 PMU support"
+	depends on ARM64 || COMPILE_TEST
+	help
+	  Support for PMU events monitoring on the Arm NI-700 Network-on-Chip
+	  interconnect and family.
+
+config ARM_PMU
+	depends on ARM || ARM64
+	bool "ARM PMU framework"
+	default y
+	help
+	  Say y if you want to use CPU performance monitors on ARM-based
+	  systems.
+
+config ARM_V6_PMU
+	depends on ARM_PMU && (CPU_V6 || CPU_V6K)
+	def_bool y
+
+config ARM_V7_PMU
+	depends on ARM_PMU && CPU_V7
+	def_bool y
+
+config ARM_XSCALE_PMU
+	depends on ARM_PMU && CPU_XSCALE
+	def_bool y
+
+config RISCV_PMU
+	depends on RISCV
+	bool "RISC-V PMU framework"
+	default y
+	help
+	  Say y if you want to use CPU performance monitors on RISCV-based
+	  systems. This provides the core PMU framework that abstracts common
+	  PMU functionalities in a core library so that different PMU drivers
+	  can reuse it.
+
+config RISCV_PMU_LEGACY
+	depends on RISCV_PMU
+	bool "RISC-V legacy PMU implementation"
+	default y
+	help
+	  Say y if you want to use the legacy CPU performance monitor
+	  implementation on RISC-V based systems. This only allows counting
+	  of cycle/instruction counter and doesn't support counter overflow,
+	  or programmable counters. It will be removed in future.
+
+config RISCV_PMU_SBI
+	depends on RISCV_PMU && RISCV_SBI
+	bool "RISC-V PMU based on SBI PMU extension"
+	default y
+	help
+	  Say y if you want to use the CPU performance monitor
+	  using SBI PMU extension on RISC-V based systems. This option provides
+	  full perf feature support i.e. counter overflow, privilege mode
+	  filtering, counter configuration.
+
+config STARFIVE_STARLINK_PMU
+	depends on ARCH_STARFIVE || COMPILE_TEST
+	depends on 64BIT
+	bool "StarFive StarLink PMU"
+	help
+	   Provide support for StarLink Performance Monitor Unit.
+	   StarLink Performance Monitor Unit integrates one or more cores with
+	   an L3 memory system. The L3 cache events are added into perf event
+	   subsystem, allowing monitoring of various L3 cache perf events.
+
+config ANDES_CUSTOM_PMU
+	bool "Andes custom PMU support"
+	depends on ARCH_RENESAS && RISCV_ALTERNATIVE && RISCV_PMU_SBI
+	default y
+	help
+	  The Andes cores implement the PMU overflow extension very
+	  similar to the standard Sscofpmf and Smcntrpmf extension.
+
+	  This will patch the overflow and pending CSRs and handle the
+	  non-standard behaviour via the regular SBI PMU driver and
+	  interface.
+
+	  If you don't know what to do here, say "Y".
+
+config ARM_PMU_ACPI
+	depends on ARM_PMU && ACPI
+	def_bool y
+
+config ARM_SMMU_V3_PMU
+	 tristate "ARM SMMUv3 Performance Monitors Extension"
+	 depends on ARM64 || (COMPILE_TEST && 64BIT)
+	 depends on GENERIC_MSI_IRQ
+	   help
+	   Provides support for the ARM SMMUv3 Performance Monitor Counter
+	   Groups (PMCG), which provide monitoring of transactions passing
+	   through the SMMU and allow the resulting information to be filtered
+	   based on the Stream ID of the corresponding master.
+
+config ARM_PMUV3
+	depends on HW_PERF_EVENTS && ((ARM && CPU_V7) || ARM64)
+	bool "ARM PMUv3 support" if !ARM64
+	default ARM64
+	  help
+	  Say y if you want to use the ARM performance monitor unit (PMU)
+	  version 3. The PMUv3 is the CPU performance monitors on ARMv8
+	  (aarch32 and aarch64) systems that implement the PMUv3
+	  architecture.
+
+config ARM_DSU_PMU
+	tristate "ARM DynamIQ Shared Unit (DSU) PMU"
+	depends on ARM64
+	  help
+	  Provides support for performance monitor unit in ARM DynamIQ Shared
+	  Unit (DSU). The DSU integrates one or more cores with an L3 memory
+	  system, control logic. The PMU allows counting various events related
+	  to DSU.
+
+config FSL_IMX8_DDR_PMU
+	tristate "Freescale i.MX8 DDR perf monitor"
+	depends on ARCH_MXC || COMPILE_TEST
+	  help
+	  Provides support for the DDR performance monitor in i.MX8, which
+	  can give information about memory throughput and other related
+	  events.
+
+config FSL_IMX9_DDR_PMU
+	tristate "Freescale i.MX9 DDR perf monitor"
+	depends on ARCH_MXC
+	 help
+	 Provides support for the DDR performance monitor in i.MX9, which
+	 can give information about memory throughput and other related
+	 events.
+
+config FUJITSU_UNCORE_PMU
+	tristate "Fujitsu Uncore PMU"
+	depends on (ARM64 && ACPI) || (COMPILE_TEST && 64BIT)
+	 help
+	 Provides support for the Uncore performance monitor unit (PMU)
+	 in Fujitsu processors.
+	 Adds the Uncore PMU into the perf events subsystem for
+	 monitoring Uncore events.
+
+config QCOM_L2_PMU
+	bool "Qualcomm L2-cache PMU"
+	depends on ARCH_QCOM && ARM64 && ACPI
+	select QCOM_KRYO_L2_ACCESSORS
+	  help
+	  Provides support for the L2 cache performance monitor unit (PMU)
+	  in Qualcomm Technologies processors.
+	  Adds the L2 cache PMU into the perf events subsystem for
+	  monitoring L2 cache events.
+
+config QCOM_L3_PMU
+	bool "Qualcomm L3-cache PMU"
+	depends on ARCH_QCOM && ARM64 && ACPI
+	select QCOM_IRQ_COMBINER
+	help
+	   Provides support for the L3 cache performance monitor unit (PMU)
+	   in Qualcomm Technologies processors.
+	   Adds the L3 cache PMU into the perf events subsystem for
+	   monitoring L3 cache events.
+
+config THUNDERX2_PMU
+	tristate "Cavium ThunderX2 SoC PMU UNCORE"
+	depends on ARCH_THUNDER2 || COMPILE_TEST
+	depends on NUMA && ACPI
+	default m if ARCH_THUNDER2
+	help
+	   Provides support for ThunderX2 UNCORE events.
+	   The SoC has PMU support in its L3 cache controller (L3C) and
+	   in the DDR4 Memory Controller (DMC).
+
+config XGENE_PMU
+        depends on ARCH_XGENE || (COMPILE_TEST && 64BIT)
+        bool "APM X-Gene SoC PMU"
+        default n
+        help
+          Say y if you want to use APM X-Gene SoC performance monitors.
+
+config ARM_SPE_PMU
+	tristate "Enable support for the ARMv8.2 Statistical Profiling Extension"
+	depends on ARM64
+	help
+	  Enable perf support for the ARMv8.2 Statistical Profiling
+	  Extension, which provides periodic sampling of operations in
+	  the CPU pipeline and reports this via the perf AUX interface.
+
+config ARM64_BRBE
+	bool "Enable support for branch stack sampling using FEAT_BRBE"
+	depends on ARM_PMUV3 && ARM64
+	default y
+	help
+	  Enable perf support for Branch Record Buffer Extension (BRBE) which
+	  records all branches taken in an execution path. This supports some
+	  branch types and privilege based filtering. It captures additional
+	  relevant information such as cycle count, misprediction and branch
+	  type, branch privilege level etc.
+
+config ARM_DMC620_PMU
+	tristate "Enable PMU support for the ARM DMC-620 memory controller"
+	depends on (ARM64 && ACPI) || COMPILE_TEST
+	help
+	  Support for PMU events monitoring on the ARM DMC-620 memory
+	  controller.
+
+config MARVELL_CN10K_TAD_PMU
+	tristate "Marvell CN10K LLC-TAD PMU"
+	depends on ARCH_THUNDER || (COMPILE_TEST && 64BIT)
+	help
+	  Provides support for Last-Level cache Tag-and-data Units (LLC-TAD)
+	  performance monitors on CN10K family silicons.
+
+config APPLE_M1_CPU_PMU
+	bool "Apple M1 CPU PMU support"
+	depends on ARM_PMU && ARCH_APPLE
+	help
+	  Provides support for the non-architectural CPU PMUs present on
+	  the Apple M1 SoCs and derivatives.
+
+config ALIBABA_UNCORE_DRW_PMU
+	tristate "Alibaba T-Head Yitian 710 DDR Sub-system Driveway PMU driver"
+	depends on (ARM64 && ACPI) || COMPILE_TEST
+	help
+	  Support for Driveway PMU events monitoring on Yitian 710 DDR
+	  Sub-system.
+
+source "drivers/perf/hisilicon/Kconfig"
+
+config MARVELL_CN10K_DDR_PMU
+	tristate "Enable MARVELL CN10K DRAM Subsystem(DSS) PMU Support"
+	depends on ARCH_THUNDER || (COMPILE_TEST && 64BIT)
+	help
+	  Enable perf support for Marvell DDR Performance monitoring
+	  event on CN10K platform.
+
+config DWC_PCIE_PMU
+	tristate "Synopsys DesignWare PCIe PMU"
+	depends on PCI
+	help
+	  Enable perf support for Synopsys DesignWare PCIe PMU Performance
+	  monitoring event on platform including the Alibaba Yitian 710.
+
+source "drivers/perf/arm_cspmu/Kconfig"
+
+source "drivers/perf/amlogic/Kconfig"
+
+config CXL_PMU
+	tristate "CXL Performance Monitoring Unit"
+	depends on CXL_BUS
+	help
+	  Support performance monitoring as defined in CXL rev 3.0
+	  section 13.2: Performance Monitoring. CXL components may have
+	  one or more CXL Performance Monitoring Units (CPMUs).
+
+	  Say 'y/m' to enable a driver that will attach to performance
+	  monitoring units and provide standard perf based interfaces.
+
+	  If unsure say 'm'.
+
+config MARVELL_PEM_PMU
+	tristate "MARVELL PEM PMU Support"
+	depends on ARCH_THUNDER || (COMPILE_TEST && 64BIT)
+	help
+	  Enable support for PCIe Interface performance monitoring
+	  on Marvell platform.
+
+config NVIDIA_TEGRA410_CMEM_LATENCY_PMU
+	tristate "NVIDIA Tegra410 CPU Memory Latency PMU"
+	depends on ARM64 && ACPI
+	help
+	  Enable perf support for CPU memory latency counters monitoring on
+	  NVIDIA Tegra410 SoC.
+
+config NVIDIA_TEGRA410_C2C_PMU
+	tristate "NVIDIA Tegra410 C2C PMU"
+	depends on ARM64 && ACPI
+	help
+	  Enable perf support for counters in NVIDIA C2C interface of NVIDIA
+	  Tegra410 SoC.
+
+endmenu