9367fb301c
In IRC, sfs_ finally managed to get a good trace of a kernel panic that was happening when attempting to use webengine. As it turns out, we were using vtophys() from interrupt context on an idle thread in opal_hmi_handler2(). Since this involves locking the kernel pmap on PPC64 at the moment, this ended up tripping a KASSERT in mtx_lock(), which then caused a parallel panic stampede. So, avoid this by preallocating the flags variable and storing it in PCPU. Fixes "panic: mtx_lock() by idle thread 0x... on sleep mutex kernelpmap". Differential Revision: https://reviews.freebsd.org/D22962
147 lines
3.7 KiB
C
147 lines
3.7 KiB
C
/*-
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* Copyright (c) 2019 Justin Hibbits
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/eventhandler.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/endian.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/spr.h>
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#include <machine/trap.h>
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#include "opal.h"
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struct opal_hmi_event {
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uint8_t version;
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uint8_t severity;
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uint8_t type;
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uint8_t disposition;
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uint8_t rsvd_1[4];
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uint64_t hmer;
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uint64_t tfmr;
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union {
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struct {
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uint8_t xstop_type;
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uint8_t rsvd_2[3];
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uint32_t xstop_reason;
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union {
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uint32_t pir;
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uint32_t chip_id;
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};
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};
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};
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};
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#define HMI_DISP_RECOVERED 0
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#define HMI_DISP_NOT_RECOVERED 1
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static void
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opal_hmi_event_handler(void *unused, struct opal_msg *msg)
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{
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struct opal_hmi_event evt;
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memcpy(&evt, &msg->params, sizeof(evt));
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printf("Hypervisor Maintenance Event received"
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"(Severity %d, type %d, HMER: %016lx).\n",
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evt.severity, evt.type, evt.hmer);
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if (evt.disposition == HMI_DISP_NOT_RECOVERED)
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panic("Unrecoverable hypervisor maintenance exception on CPU %d",
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evt.pir);
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return;
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}
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static int
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opal_hmi_handler2(struct trapframe *frame)
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{
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/*
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* Use DMAP preallocated pcpu memory to handle
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* the phys flags pointer.
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*/
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uint64_t *flags = PCPU_PTR(aim.opal_hmi_flags);
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int err;
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*flags = 0;
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err = opal_call(OPAL_HANDLE_HMI2, DMAP_TO_PHYS((vm_offset_t)flags));
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if (*flags & OPAL_HMI_FLAGS_TOD_TB_FAIL)
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panic("TOD/TB recovery failure");
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if (err == OPAL_SUCCESS)
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return (0);
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printf("HMI handler failed! OPAL error code: %d\n", err);
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return (-1);
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}
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static int
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opal_hmi_handler(struct trapframe *frame)
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{
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int err;
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err = opal_call(OPAL_HANDLE_HMI);
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if (err == OPAL_SUCCESS)
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return (0);
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printf("HMI handler failed! OPAL error code: %d\n", err);
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return (-1);
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}
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static void
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opal_setup_hmi(void *data)
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{
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/* This only works for OPAL, so first make sure we have it. */
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if (opal_check() != 0)
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return;
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if (opal_call(OPAL_CHECK_TOKEN, OPAL_HANDLE_HMI2) == OPAL_TOKEN_PRESENT)
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hmi_handler = opal_hmi_handler2;
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else if (opal_call(OPAL_CHECK_TOKEN, OPAL_HANDLE_HMI) == OPAL_TOKEN_PRESENT)
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hmi_handler = opal_hmi_handler;
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else {
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printf("Warning: No OPAL HMI handler found.\n");
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return;
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}
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EVENTHANDLER_REGISTER(OPAL_HMI_EVT, opal_hmi_event_handler, NULL,
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EVENTHANDLER_PRI_ANY);
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if (bootverbose)
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printf("Installed OPAL HMI handler.\n");
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}
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SYSINIT(opal_setup_hmi, SI_SUB_CPU, SI_ORDER_ANY, opal_setup_hmi, NULL);
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