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review.trustedfirmware.org / hafnium / third_party / linux / 157378f43faad830e4aa3815bde5fa9f9a9f5be6 / . / arch / powerpc / kernel / dbell.c
blob: 52680cf07c9dcac3619c823dd62895787b33daba [file] [log] [blame]
David Brazdil0f672f62019-12-10 10:32:29 +0000[diff] [blame]1// SPDX-License-Identifier: GPL-2.0-or-later
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]2/*
3 * Author: Kumar Gala <galak@kernel.crashing.org>
4 *
5 * Copyright 2009 Freescale Semiconductor Inc.
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]6 */
7
8#include <linux/stddef.h>
9#include <linux/kernel.h>
10#include <linux/smp.h>
11#include <linux/threads.h>
12#include <linux/hardirq.h>
13
14#include <asm/dbell.h>
15#include <asm/irq_regs.h>
16#include <asm/kvm_ppc.h>
David Brazdil0f672f62019-12-10 10:32:29 +0000[diff] [blame]17#include <asm/trace.h>
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]18
19#ifdef CONFIG_SMP
20
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]21void doorbell_exception(struct pt_regs *regs)
22{
23 struct pt_regs *old_regs = set_irq_regs(regs);
24
25 irq_enter();
David Brazdil0f672f62019-12-10 10:32:29 +0000[diff] [blame]26 trace_doorbell_entry(regs);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]27
28 ppc_msgsync();
29
30 may_hard_irq_enable();
31
David Brazdil0f672f62019-12-10 10:32:29 +0000[diff] [blame]32 kvmppc_clear_host_ipi(smp_processor_id());
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]33 __this_cpu_inc(irq_stat.doorbell_irqs);
34
35 smp_ipi_demux_relaxed(); /* already performed the barrier */
36
David Brazdil0f672f62019-12-10 10:32:29 +0000[diff] [blame]37 trace_doorbell_exit(regs);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]38 irq_exit();
39 set_irq_regs(old_regs);
40}
41#else /* CONFIG_SMP */
42void doorbell_exception(struct pt_regs *regs)
43{
44 printk(KERN_WARNING "Received doorbell on non-smp system\n");
45}
46#endif /* CONFIG_SMP */
47