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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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0b05ac6e24
This is a significant rework of the XICS driver, too significant to conveniently break it up into a series of smaller patches to be honest. The driver is moved to a more generic location to allow new platforms to use it, and is broken up into separate ICP and ICS "backends". For now we have the native and "hypervisor" ICP backends and one common RTAS ICS backend. The driver supports one ICP backend instanciation, and many ICS ones, in order to accomodate future platforms with multiple possibly different interrupt "sources" mechanisms. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
/*
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* Copyright 2006 Michael Ellerman, IBM Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <asm/machdep.h>
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#include <asm/page.h>
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#include <asm/firmware.h>
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#include <asm/kexec.h>
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#include <asm/mpic.h>
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#include <asm/xics.h>
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#include <asm/smp.h>
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#include "pseries.h"
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#include "plpar_wrappers.h"
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static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
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{
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/* Don't risk a hypervisor call if we're crashing */
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if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
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unsigned long addr;
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addr = __pa(get_slb_shadow());
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if (unregister_slb_shadow(hard_smp_processor_id(), addr))
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printk("SLB shadow buffer deregistration of "
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"cpu %u (hw_cpu_id %d) failed\n",
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smp_processor_id(),
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hard_smp_processor_id());
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addr = __pa(get_lppaca());
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if (unregister_vpa(hard_smp_processor_id(), addr)) {
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printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
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"failed\n", smp_processor_id(),
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hard_smp_processor_id());
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}
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}
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}
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static void pseries_kexec_cpu_down_mpic(int crash_shutdown, int secondary)
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{
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pseries_kexec_cpu_down(crash_shutdown, secondary);
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mpic_teardown_this_cpu(secondary);
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}
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void __init setup_kexec_cpu_down_mpic(void)
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{
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ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_mpic;
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}
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static void pseries_kexec_cpu_down_xics(int crash_shutdown, int secondary)
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{
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pseries_kexec_cpu_down(crash_shutdown, secondary);
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xics_kexec_teardown_cpu(secondary);
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}
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void __init setup_kexec_cpu_down_xics(void)
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{
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ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_xics;
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}
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