From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- arch/mips/econet/Kconfig | 48 +++++++++++++++++++ arch/mips/econet/Makefile | 2 + arch/mips/econet/Platform | 5 ++ arch/mips/econet/init.c | 118 ++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 173 insertions(+) create mode 100644 arch/mips/econet/Kconfig create mode 100644 arch/mips/econet/Makefile create mode 100644 arch/mips/econet/Platform create mode 100644 arch/mips/econet/init.c (limited to 'arch/mips/econet') diff --git a/arch/mips/econet/Kconfig b/arch/mips/econet/Kconfig new file mode 100644 index 000000000..579fb5b01 --- /dev/null +++ b/arch/mips/econet/Kconfig @@ -0,0 +1,48 @@ +# SPDX-License-Identifier: GPL-2.0 +if ECONET + +choice + prompt "EcoNet SoC selection" + default SOC_ECONET_EN751221 + help + Select EcoNet MIPS SoC type. Individual SoCs within a family are + very similar, so is it enough to select the right family, and + then customize to the specific SoC using the device tree only. + + config SOC_ECONET_EN751221 + bool "EN751221 family" + select COMMON_CLK + select ECONET_EN751221_INTC + select HAVE_PCI + select IRQ_MIPS_CPU + select PCI_DRIVERS_GENERIC + select SYS_SUPPORTS_MULTITHREADING + help + The EN751221 family includes EN7512, RN7513, EN7521, EN7526. + They are based on single core MIPS 34Kc processors. To boot + this kernel, you will need a device tree such as + MIPS_RAW_APPENDED_DTB=y, and a root filesystem. +endchoice + +choice + prompt "Devicetree selection" + default DTB_ECONET_NONE + help + Select the devicetree. + + config DTB_ECONET_NONE + bool "None" + + config DTB_ECONET_SMARTFIBER_XP8421_B + bool "EN751221 SmartFiber XP8421-B" + depends on SOC_ECONET_EN751221 + select BUILTIN_DTB + help + The SmartFiber XP8421-B is a device based on the EN751221 SoC. + It has 512MB of memory and 256MB of NAND flash. This kernel + needs only an appended initramfs to boot. It can be loaded + through XMODEM and booted from memory in the bootloader, or + it can be packed in tclinux.trx format and written to flash. +endchoice + +endif diff --git a/arch/mips/econet/Makefile b/arch/mips/econet/Makefile new file mode 100644 index 000000000..7e4529e7d --- /dev/null +++ b/arch/mips/econet/Makefile @@ -0,0 +1,2 @@ + +obj-y := init.o diff --git a/arch/mips/econet/Platform b/arch/mips/econet/Platform new file mode 100644 index 000000000..ea5616447 --- /dev/null +++ b/arch/mips/econet/Platform @@ -0,0 +1,5 @@ +# To address a 7.2MB kernel size limit in the EcoNet SDK bootloader, +# we put the load address well above where the bootloader loads and then use +# zboot. So please set CONFIG_ZBOOT_LOAD_ADDRESS to the address where your +# bootloader actually places the kernel. +load-$(CONFIG_ECONET) += 0xffffffff81000000 diff --git a/arch/mips/econet/init.c b/arch/mips/econet/init.c new file mode 100644 index 000000000..ae45b8788 --- /dev/null +++ b/arch/mips/econet/init.c @@ -0,0 +1,118 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * EcoNet setup code + * + * Copyright (C) 2025 Caleb James DeLisle + */ + +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#define CR_AHB_RSTCR ((void __iomem *)CKSEG1ADDR(0x1fb00040)) +#define RESET BIT(31) + +#define UART_BASE CKSEG1ADDR(0x1fbf0003) +#define UART_REG_SHIFT 2 + +static void hw_reset(char *command) +{ + iowrite32(RESET, CR_AHB_RSTCR); +} + +/* + * vsmp_init_secondary expects either GIC or cascading interrupt configuration. + * The EN751221 is a 34Kc with VEIC, but not GIC compatible. The cascading + * configuration enables lines 6 and 7 for performance counters, but when this + * is done on the EN751221 intc with VEIC enabled, it causes the whole intc to + * stop sending interrupts. + * Only unmask lines 0 and 1 (software interrupts) in init_secondary. + */ +#ifdef CONFIG_MIPS_MT_SMP +extern const struct plat_smp_ops vsmp_smp_ops; +static struct plat_smp_ops en75_smp_ops __ro_after_init; + +static void en751221_init_secondary(void) +{ + write_c0_status((read_c0_status() & ~ST0_IM) | + (STATUSF_IP0 | STATUSF_IP1)); +} + +static int __init en751221_register_vsmp_smp_ops(void) +{ + if (!cpu_has_mipsmt) + return -ENODEV; + + en75_smp_ops = vsmp_smp_ops; + en75_smp_ops.init_secondary = en751221_init_secondary; + register_smp_ops(&en75_smp_ops); + return 0; +} +#else +static int __init en751221_register_vsmp_smp_ops(void) +{ + return -ENODEV; +} +#endif /* CONFIG_MIPS_MT_SMP */ + +/* 1. Bring up early printk. */ +void __init prom_init(void) +{ + setup_8250_early_printk_port(UART_BASE, UART_REG_SHIFT, 0); + _machine_restart = hw_reset; +} + +/* 2. Parse the DT and find memory */ +void __init plat_mem_setup(void) +{ + void *dtb; + + set_io_port_base(KSEG1); + + dtb = get_fdt(); + if (!dtb) + panic("no dtb found"); + + __dt_setup_arch(dtb); + + early_init_dt_scan_memory(); +} + +/* 3. Overload __weak device_tree_init(), add SMP ops */ +void __init device_tree_init(void) +{ + unflatten_and_copy_device_tree(); + + /* EN751221 dual-vpe */ + if (!en751221_register_vsmp_smp_ops()) + return; + + /* EN751221 with MT_SMP disabled */ + register_up_smp_ops(); +} + +const char *get_system_type(void) +{ + return "EcoNet-EN75xx"; +} + +/* 4. Initialize the IRQ subsystem */ +void __init arch_init_irq(void) +{ + irqchip_init(); +} + +/* 5. Timers */ +void __init plat_time_init(void) +{ + of_clk_init(NULL); + timer_probe(); +} -- cgit v1.3.1