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ebc9cb03b2
The independent softirq stack uses s0 to save & restore sp, but s0 would
be corrupted when CONFIG_FRAME_POINTER=n. So add s0 in the clobber list
to fix the problem.
Fixes: dd69d07a5a ("riscv: stack: Support HAVE_SOFTIRQ_ON_OWN_STACK")
Cc: stable@vger.kernel.org
Reported-by: Zhangjin Wu <falcon@tinylab.org>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Tested-by: Drew Fustini <dfustini@baylibre.com>
Link: https://lore.kernel.org/r/20230716001506.3506041-3-guoren@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
115 lines
2.5 KiB
C
115 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2012 Regents of the University of California
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* Copyright (C) 2017 SiFive
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* Copyright (C) 2018 Christoph Hellwig
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*/
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#include <linux/interrupt.h>
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#include <linux/irqchip.h>
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#include <linux/irqdomain.h>
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#include <linux/module.h>
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#include <linux/seq_file.h>
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#include <asm/sbi.h>
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#include <asm/smp.h>
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#include <asm/softirq_stack.h>
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#include <asm/stacktrace.h>
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static struct fwnode_handle *(*__get_intc_node)(void);
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void riscv_set_intc_hwnode_fn(struct fwnode_handle *(*fn)(void))
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{
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__get_intc_node = fn;
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}
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struct fwnode_handle *riscv_get_intc_hwnode(void)
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{
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if (__get_intc_node)
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return __get_intc_node();
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return NULL;
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}
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EXPORT_SYMBOL_GPL(riscv_get_intc_hwnode);
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#ifdef CONFIG_IRQ_STACKS
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#include <asm/irq_stack.h>
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DEFINE_PER_CPU(ulong *, irq_stack_ptr);
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#ifdef CONFIG_VMAP_STACK
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static void init_irq_stacks(void)
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{
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int cpu;
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ulong *p;
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for_each_possible_cpu(cpu) {
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p = arch_alloc_vmap_stack(IRQ_STACK_SIZE, cpu_to_node(cpu));
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per_cpu(irq_stack_ptr, cpu) = p;
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}
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}
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#else
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/* irq stack only needs to be 16 byte aligned - not IRQ_STACK_SIZE aligned. */
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DEFINE_PER_CPU_ALIGNED(ulong [IRQ_STACK_SIZE/sizeof(ulong)], irq_stack);
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static void init_irq_stacks(void)
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{
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int cpu;
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for_each_possible_cpu(cpu)
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per_cpu(irq_stack_ptr, cpu) = per_cpu(irq_stack, cpu);
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}
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#endif /* CONFIG_VMAP_STACK */
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#ifdef CONFIG_HAVE_SOFTIRQ_ON_OWN_STACK
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void do_softirq_own_stack(void)
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{
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#ifdef CONFIG_IRQ_STACKS
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if (on_thread_stack()) {
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ulong *sp = per_cpu(irq_stack_ptr, smp_processor_id())
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+ IRQ_STACK_SIZE/sizeof(ulong);
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__asm__ __volatile(
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"addi sp, sp, -"RISCV_SZPTR "\n"
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REG_S" ra, (sp) \n"
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"addi sp, sp, -"RISCV_SZPTR "\n"
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REG_S" s0, (sp) \n"
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"addi s0, sp, 2*"RISCV_SZPTR "\n"
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"move sp, %[sp] \n"
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"call __do_softirq \n"
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"addi sp, s0, -2*"RISCV_SZPTR"\n"
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REG_L" s0, (sp) \n"
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"addi sp, sp, "RISCV_SZPTR "\n"
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REG_L" ra, (sp) \n"
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"addi sp, sp, "RISCV_SZPTR "\n"
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:
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: [sp] "r" (sp)
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: "a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7",
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"t0", "t1", "t2", "t3", "t4", "t5", "t6",
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#ifndef CONFIG_FRAME_POINTER
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"s0",
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#endif
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"memory");
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} else
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#endif
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__do_softirq();
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}
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#endif /* CONFIG_HAVE_SOFTIRQ_ON_OWN_STACK */
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#else
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static void init_irq_stacks(void) {}
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#endif /* CONFIG_IRQ_STACKS */
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int arch_show_interrupts(struct seq_file *p, int prec)
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{
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show_ipi_stats(p, prec);
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return 0;
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}
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void __init init_IRQ(void)
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{
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init_irq_stacks();
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irqchip_init();
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if (!handle_arch_irq)
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panic("No interrupt controller found.");
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sbi_ipi_init();
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}
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