Author: jhibbits Date: Sat Mar 23 03:23:20 2019 New Revision: 345435 URL: https://svnweb.freebsd.org/changeset/base/345435
Log: powernv: Add Hypervisor Maintenance Interrupt handler Attempting to build www/firefox on POWER9 resulted in a HMI exception being thrown, a fatal trap currently. This is typically caused by timer facility errors, but examination of the Hypervisor Maintenance Exception Register (HMER) yielded only that an exception had recovered, with no information of the actual exception cause. When an HMI occurs, OPAL_HANDLE_HMI or OPAL_HANDLE_HMI2 must be called to handle the exception at the firmware level. If the exception is handled, we can continue. This adds only the preliminary handler, enough to prevent package building from panicking. An enhancement in the future is to use the flags returned by OPAL_HANDLE_HMI2 to print more useful error messages, and log maintenance events. Reviewed by: luporl MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D19634 Added: head/sys/powerpc/powernv/opal_hmi.c (contents, props changed) Modified: head/sys/conf/files.powerpc head/sys/powerpc/include/spr.h head/sys/powerpc/include/trap.h head/sys/powerpc/powernv/opal.h head/sys/powerpc/powerpc/interrupt.c Modified: head/sys/conf/files.powerpc ============================================================================== --- head/sys/conf/files.powerpc Sat Mar 23 03:10:23 2019 (r345434) +++ head/sys/conf/files.powerpc Sat Mar 23 03:23:20 2019 (r345435) @@ -192,6 +192,7 @@ powerpc/powernv/opal_async.c optional powernv powerpc/powernv/opal_console.c optional powernv powerpc/powernv/opal_dev.c optional powernv powerpc/powernv/opal_flash.c optional powernv +powerpc/powernv/opal_hmi.c optional powernv powerpc/powernv/opal_i2c.c optional iicbus fdt powernv powerpc/powernv/opal_i2cm.c optional iicbus fdt powernv powerpc/powernv/opal_pci.c optional powernv pci Modified: head/sys/powerpc/include/spr.h ============================================================================== --- head/sys/powerpc/include/spr.h Sat Mar 23 03:10:23 2019 (r345434) +++ head/sys/powerpc/include/spr.h Sat Mar 23 03:23:20 2019 (r345435) @@ -242,6 +242,8 @@ #define LPCR_PECE_ME (1ULL << 12) /* Machine Check and Hypervisor */ /* Maintenance exceptions */ #define SPR_LPID 0x13f /* Logical Partitioning Control */ +#define SPR_HMER 0x150 /* Hypervisor Maintenance Exception Register */ +#define SPR_HMEER 0x151 /* Hypervisor Maintenance Exception Enable Register */ #define SPR_PTCR 0x1d0 /* Partition Table Control Register */ #define SPR_SPEFSCR 0x200 /* ..8 Signal Processing Engine FSCR. */ Modified: head/sys/powerpc/include/trap.h ============================================================================== --- head/sys/powerpc/include/trap.h Sat Mar 23 03:10:23 2019 (r345434) +++ head/sys/powerpc/include/trap.h Sat Mar 23 03:23:20 2019 (r345435) @@ -153,6 +153,7 @@ #ifndef LOCORE struct trapframe; struct pcb; +extern int (*hmi_handler)(struct trapframe *); void trap(struct trapframe *); int ppc_instr_emulate(struct trapframe *, struct pcb *); #endif Modified: head/sys/powerpc/powernv/opal.h ============================================================================== --- head/sys/powerpc/powernv/opal.h Sat Mar 23 03:10:23 2019 (r345434) +++ head/sys/powerpc/powernv/opal.h Sat Mar 23 03:23:20 2019 (r345435) @@ -71,8 +71,10 @@ int opal_call(uint64_t token, ...); #define OPAL_PCI_MAP_PE_DMA_WINDOW_REAL 45 #define OPAL_RETURN_CPU 69 #define OPAL_REINIT_CPUS 70 +#define OPAL_CHECK_TOKEN 80 #define OPAL_CHECK_ASYNC_COMPLETION 86 #define OPAL_SENSOR_READ 88 +#define OPAL_HANDLE_HMI 98 #define OPAL_IPMI_SEND 107 #define OPAL_IPMI_RECV 108 #define OPAL_I2C_REQUEST 109 @@ -102,6 +104,7 @@ int opal_call(uint64_t token, ...); #define OPAL_SENSOR_GROUP_CLEAR 156 #define OPAL_SENSOR_READ_U64 162 #define OPAL_SENSOR_GROUP_ENABLE 163 +#define OPAL_HANDLE_HMI2 166 /* For OPAL_PCI_SET_PE */ #define OPAL_UNMAP_PE 0 @@ -133,6 +136,15 @@ int opal_call(uint64_t token, ...); #define OPAL_EMPTY -16 #define OPAL_XIVE_PROVISIONING -31 #define OPAL_XIVE_FREE_ACTIVE -32 + +#define OPAL_TOKEN_ABSENT 0 +#define OPAL_TOKEN_PRESENT 1 + +#define OPAL_HMI_FLAGS_TB_RESYNC (1ull << 0) +#define OPAL_HMI_FLAGS_DEC_LOST (1ull << 1) +#define OPAL_HMI_FLAGS_HDEC_LOST (1ull << 2) +#define OPAL_HMI_FLAGS_TOD_TB_FAIL (1ull << 3) +#define OPAL_HMI_FLAGS_NEW_EVENT (1ull << 63) #define OPAL_XIVE_XICS_MODE_EMU 0 #define OPAL_XIVE_XICS_MODE_EXP 1 Added: head/sys/powerpc/powernv/opal_hmi.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/powerpc/powernv/opal_hmi.c Sat Mar 23 03:23:20 2019 (r345435) @@ -0,0 +1,97 @@ +/*- + * Copyright (c) 2019 Justin Hibbits + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/types.h> +#include <sys/kernel.h> +#include <sys/systm.h> + +#include <vm/vm.h> +#include <vm/pmap.h> + +#include <machine/spr.h> +#include <machine/trap.h> +#include "opal.h" + +static int +opal_hmi_handler2(struct trapframe *frame) +{ + int64_t flags; + int err; + + err = opal_call(OPAL_HANDLE_HMI2, vtophys(&flags)); + + /* XXX: At some point, handle the flags outvar. */ + if (err == OPAL_SUCCESS) { + mtspr(SPR_HMER, 0); + return (0); + } + + printf("HMI handler failed! OPAL error code: %d\n", err); + + return (-1); +} + +static int +opal_hmi_handler(struct trapframe *frame) +{ + int err; + + err = opal_call(OPAL_HANDLE_HMI); + + if (err == OPAL_SUCCESS) { + mtspr(SPR_HMER, 0); + return (0); + } + + printf("HMI handler failed! OPAL error code: %d\n", err); + + return (-1); +} + +static void +opal_setup_hmi(void *data) +{ + /* This only works for OPAL, so first make sure we have it. */ + if (opal_check() != 0) + return; + + if (opal_call(OPAL_CHECK_TOKEN, OPAL_HANDLE_HMI2) == OPAL_TOKEN_PRESENT) + hmi_handler = opal_hmi_handler2; + else if (opal_call(OPAL_CHECK_TOKEN, OPAL_HANDLE_HMI) == OPAL_TOKEN_PRESENT) + hmi_handler = opal_hmi_handler; + else { + printf("Warning: No OPAL HMI handler found.\n"); + return; + } + + if (bootverbose) + printf("Installed OPAL HMI handler.\n"); +} + +SYSINIT(opal_setup_hmi, SI_SUB_HYPERVISOR, SI_ORDER_ANY, opal_setup_hmi, NULL); Modified: head/sys/powerpc/powerpc/interrupt.c ============================================================================== --- head/sys/powerpc/powerpc/interrupt.c Sat Mar 23 03:10:23 2019 (r345434) +++ head/sys/powerpc/powerpc/interrupt.c Sat Mar 23 03:23:20 2019 (r345435) @@ -32,6 +32,7 @@ */ #include "opt_hwpmc_hooks.h" +#include "opt_platform.h" #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ @@ -68,6 +69,10 @@ #include "pic_if.h" +#ifdef POWERNV +int (*hmi_handler)(struct trapframe *); +#endif + /* * A very short dispatch, to try and maximise assembler code use * between all exception types. Maybe 'true' interrupts should go @@ -117,6 +122,13 @@ powerpc_interrupt(struct trapframe *framep) pmc_hook(PCPU_GET(curthread), PMC_FN_USER_CALLCHAIN, framep); critical_exit(); break; +#endif + +#ifdef POWERNV + case EXC_HMI: + if (hmi_handler != 0 && hmi_handler(framep) == 0) + break; + /* If no handler, or failure to handle, just drop to trap. */ #endif default: _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
