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5cd474e573
Interrupts are blocked in SDEI context, per the SDEI spec: "The client
interrupts cannot preempt the event handler." If we crashed in the SDEI
handler-running context (as with ACPI's AGDI) then we need to clean up the
SDEI state before proceeding to the crash kernel so that the crash kernel
can have working interrupts.
Track the active SDEI handler per-cpu so that we can COMPLETE_AND_RESUME
the handler, discarding the interrupted context.
Fixes: f5df269618 ("arm64: kernel: Add arch-specific SDEI entry code and CPU masking")
Signed-off-by: D Scott Phillips <scott@os.amperecomputing.com>
Cc: stable@vger.kernel.org
Reviewed-by: James Morse <james.morse@arm.com>
Tested-by: Mihai Carabas <mihai.carabas@oracle.com>
Link: https://lore.kernel.org/r/20230627002939.2758-1-scott@os.amperecomputing.com
Signed-off-by: Will Deacon <will@kernel.org>
54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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// Copyright (C) 2017 Arm Ltd.
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#ifndef __ASM_SDEI_H
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#define __ASM_SDEI_H
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/* Values for sdei_exit_mode */
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#define SDEI_EXIT_HVC 0
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#define SDEI_EXIT_SMC 1
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#define SDEI_STACK_SIZE IRQ_STACK_SIZE
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#ifndef __ASSEMBLY__
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#include <linux/linkage.h>
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#include <linux/preempt.h>
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#include <linux/types.h>
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#include <asm/virt.h>
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DECLARE_PER_CPU(struct sdei_registered_event *, sdei_active_normal_event);
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DECLARE_PER_CPU(struct sdei_registered_event *, sdei_active_critical_event);
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extern unsigned long sdei_exit_mode;
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/* Software Delegated Exception entry point from firmware*/
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asmlinkage void __sdei_asm_handler(unsigned long event_num, unsigned long arg,
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unsigned long pc, unsigned long pstate);
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/* and its CONFIG_UNMAP_KERNEL_AT_EL0 trampoline */
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asmlinkage void __sdei_asm_entry_trampoline(unsigned long event_num,
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unsigned long arg,
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unsigned long pc,
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unsigned long pstate);
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/* Abort a running handler. Context is discarded. */
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void __sdei_handler_abort(void);
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/*
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* The above entry point does the minimum to call C code. This function does
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* anything else, before calling the driver.
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*/
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struct sdei_registered_event;
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asmlinkage unsigned long __sdei_handler(struct pt_regs *regs,
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struct sdei_registered_event *arg);
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unsigned long do_sdei_event(struct pt_regs *regs,
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struct sdei_registered_event *arg);
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unsigned long sdei_arch_get_entry_point(int conduit);
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#define sdei_arch_get_entry_point(x) sdei_arch_get_entry_point(x)
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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_SDEI_H */
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