[PPC64] Enable phyp vty use as a GDB DBGPORT
This change makes it possible to use a POWER Hypervisor virtual terminal device (phyp vty) as a GDB debug port. Similar to the uart debug port, it has to be enabled by setting the hw.uart_phyp.dbgport variable to the vty node of the device tree. Reviewed by: jhibbits Differential Revision: https://reviews.freebsd.org/D22205
This commit is contained in:
Leandro Lupori
parent
4f4f3c8fdc
commit
4ceaf951fb
@ -262,6 +262,7 @@ powerpc/ps3/ps3-hvcall.S optional ps3
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powerpc/pseries/phyp-hvcall.S optional pseries powerpc64
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powerpc/pseries/mmu_phyp.c optional pseries powerpc64
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powerpc/pseries/phyp_console.c optional pseries powerpc64 uart
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powerpc/pseries/phyp_dbg.c optional pseries powerpc64 gdb
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powerpc/pseries/phyp_llan.c optional llan
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powerpc/pseries/phyp_vscsi.c optional pseries powerpc64 scbus
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powerpc/pseries/platform_chrp.c optional pseries
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163
sys/powerpc/pseries/phyp_dbg.c
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163
sys/powerpc/pseries/phyp_dbg.c
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@ -0,0 +1,163 @@
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (C) 2019 Leandro Lupori
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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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* 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 TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* 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/linker_set.h>
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#include <dev/ofw/openfirm.h>
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#include <gdb/gdb.h>
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#include "phyp-hvcall.h"
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static gdb_probe_f uart_phyp_dbg_probe;
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static gdb_init_f uart_phyp_dbg_init;
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static gdb_term_f uart_phyp_dbg_term;
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static gdb_getc_f uart_phyp_dbg_getc;
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static gdb_putc_f uart_phyp_dbg_putc;
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GDB_DBGPORT(uart_phyp, uart_phyp_dbg_probe,
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uart_phyp_dbg_init, uart_phyp_dbg_term,
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uart_phyp_dbg_getc, uart_phyp_dbg_putc);
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static struct uart_phyp_dbgport {
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cell_t vtermid;
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union {
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uint64_t u64[2];
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char str[16];
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} inbuf;
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uint64_t inbuflen;
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} dbgport;
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static int
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uart_phyp_dbg_probe(void)
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{
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char buf[64];
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cell_t reg;
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phandle_t vty;
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if (!getenv_string("hw.uart_phyp.dbgport", buf, sizeof(buf)))
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return (-1);
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if ((vty = OF_finddevice(buf)) == -1)
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return (-1);
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if (OF_getprop(vty, "name", buf, sizeof(buf)) <= 0)
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return (-1);
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if (strcmp(buf, "vty") != 0)
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return (-1);
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if (OF_getprop(vty, "device_type", buf, sizeof(buf)) == -1)
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return (-1);
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if (strcmp(buf, "serial") != 0)
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return (-1);
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if (OF_getprop(vty, "compatible", buf, sizeof(buf)) <= 0)
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return (-1);
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if (strcmp(buf, "hvterm1") != 0)
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return (-1);
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reg = ~0U;
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OF_getencprop(vty, "reg", ®, sizeof(reg));
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if (reg == ~0U)
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return (-1);
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dbgport.vtermid = reg;
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dbgport.inbuflen = 0;
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return (0);
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}
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static void
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uart_phyp_dbg_init(void)
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{
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}
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static void
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uart_phyp_dbg_term(void)
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{
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}
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static int
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uart_phyp_dbg_getc(void)
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{
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int c, err, next;
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if (dbgport.inbuflen == 0) {
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err = phyp_pft_hcall(H_GET_TERM_CHAR, dbgport.vtermid,
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0, 0, 0, &dbgport.inbuflen, &dbgport.inbuf.u64[0],
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&dbgport.inbuf.u64[1]);
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if (err != H_SUCCESS)
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return (-1);
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}
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if (dbgport.inbuflen == 0)
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return (-1);
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c = dbgport.inbuf.str[0];
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dbgport.inbuflen--;
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if (dbgport.inbuflen == 0)
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return (c);
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/*
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* Since version 2.11.0, QEMU became bug-compatible
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* with PowerVM's vty, by inserting a \0 after every \r.
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* Filter it here.
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*/
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next = 1;
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if (c == '\r' && dbgport.inbuf.str[next] == '\0') {
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next++;
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dbgport.inbuflen--;
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}
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if (dbgport.inbuflen > 0)
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memmove(&dbgport.inbuf.str[0], &dbgport.inbuf.str[next],
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dbgport.inbuflen);
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return (c);
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}
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static void
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uart_phyp_dbg_putc(int c)
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{
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int err;
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union {
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uint64_t u64;
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unsigned char bytes[8];
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} cbuf;
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cbuf.bytes[0] = (unsigned char)c;
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do {
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err = phyp_hcall(H_PUT_TERM_CHAR, dbgport.vtermid, 1,
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cbuf.u64, 0);
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DELAY(100);
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} while (err == H_BUSY);
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}
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