![Paul Mackerras](/assets/img/avatar_default.png)
Commit473980a993
added a call to clear the SLB shadow buffer before registering it. Unfortunately this means that we clear out the entries that slb_initialize has previously set in there. On POWER6, the hypervisor uses the SLB shadow buffer when doing partition switches, and that means that after the next partition switch, each non-boot CPU has no SLB entries to map the kernel text and data, which causes it to crash. This fixes it by reverting most of473980a9
and instead clearing the 3rd entry explicitly in slb_initialize. This fixes the problem that473980a9
was trying to solve, but without breaking POWER6. Signed-off-by: Paul Mackerras <paulus@samba.org>
603 lines
15 KiB
C
603 lines
15 KiB
C
/*
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* pSeries_lpar.c
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* Copyright (C) 2001 Todd Inglett, IBM Corporation
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*
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* pSeries LPAR support.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#undef DEBUG_LOW
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#include <linux/kernel.h>
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#include <linux/dma-mapping.h>
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#include <linux/console.h>
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#include <asm/processor.h>
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#include <asm/mmu.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/machdep.h>
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#include <asm/abs_addr.h>
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#include <asm/mmu_context.h>
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#include <asm/iommu.h>
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#include <asm/tlbflush.h>
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#include <asm/tlb.h>
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#include <asm/prom.h>
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#include <asm/cputable.h>
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#include <asm/udbg.h>
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#include <asm/smp.h>
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#include "plpar_wrappers.h"
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#ifdef DEBUG_LOW
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#define DBG_LOW(fmt...) do { udbg_printf(fmt); } while(0)
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#else
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#define DBG_LOW(fmt...) do { } while(0)
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#endif
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/* in hvCall.S */
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EXPORT_SYMBOL(plpar_hcall);
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EXPORT_SYMBOL(plpar_hcall9);
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EXPORT_SYMBOL(plpar_hcall_norets);
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extern void pSeries_find_serial_port(void);
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int vtermno; /* virtual terminal# for udbg */
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#define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
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static void udbg_hvsi_putc(char c)
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{
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/* packet's seqno isn't used anyways */
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uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c };
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int rc;
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if (c == '\n')
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udbg_hvsi_putc('\r');
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do {
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rc = plpar_put_term_char(vtermno, sizeof(packet), packet);
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} while (rc == H_BUSY);
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}
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static long hvsi_udbg_buf_len;
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static uint8_t hvsi_udbg_buf[256];
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static int udbg_hvsi_getc_poll(void)
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{
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unsigned char ch;
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int rc, i;
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if (hvsi_udbg_buf_len == 0) {
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rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf);
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if (rc != H_SUCCESS || hvsi_udbg_buf[0] != 0xff) {
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/* bad read or non-data packet */
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hvsi_udbg_buf_len = 0;
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} else {
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/* remove the packet header */
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for (i = 4; i < hvsi_udbg_buf_len; i++)
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hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i];
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hvsi_udbg_buf_len -= 4;
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}
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}
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if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) {
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/* no data ready */
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hvsi_udbg_buf_len = 0;
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return -1;
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}
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ch = hvsi_udbg_buf[0];
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/* shift remaining data down */
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for (i = 1; i < hvsi_udbg_buf_len; i++) {
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hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i];
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}
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hvsi_udbg_buf_len--;
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return ch;
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}
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static int udbg_hvsi_getc(void)
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{
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int ch;
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for (;;) {
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ch = udbg_hvsi_getc_poll();
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if (ch == -1) {
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/* This shouldn't be needed...but... */
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volatile unsigned long delay;
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for (delay=0; delay < 2000000; delay++)
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;
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} else {
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return ch;
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}
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}
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}
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static void udbg_putcLP(char c)
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{
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char buf[16];
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unsigned long rc;
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if (c == '\n')
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udbg_putcLP('\r');
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buf[0] = c;
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do {
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rc = plpar_put_term_char(vtermno, 1, buf);
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} while(rc == H_BUSY);
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}
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/* Buffered chars getc */
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static long inbuflen;
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static long inbuf[2]; /* must be 2 longs */
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static int udbg_getc_pollLP(void)
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{
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/* The interface is tricky because it may return up to 16 chars.
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* We save them statically for future calls to udbg_getc().
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*/
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char ch, *buf = (char *)inbuf;
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int i;
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long rc;
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if (inbuflen == 0) {
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/* get some more chars. */
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inbuflen = 0;
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rc = plpar_get_term_char(vtermno, &inbuflen, buf);
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if (rc != H_SUCCESS)
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inbuflen = 0; /* otherwise inbuflen is garbage */
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}
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if (inbuflen <= 0 || inbuflen > 16) {
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/* Catch error case as well as other oddities (corruption) */
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inbuflen = 0;
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return -1;
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}
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ch = buf[0];
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for (i = 1; i < inbuflen; i++) /* shuffle them down. */
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buf[i-1] = buf[i];
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inbuflen--;
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return ch;
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}
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static int udbg_getcLP(void)
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{
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int ch;
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for (;;) {
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ch = udbg_getc_pollLP();
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if (ch == -1) {
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/* This shouldn't be needed...but... */
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volatile unsigned long delay;
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for (delay=0; delay < 2000000; delay++)
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;
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} else {
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return ch;
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}
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}
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}
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/* call this from early_init() for a working debug console on
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* vterm capable LPAR machines
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*/
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void __init udbg_init_debug_lpar(void)
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{
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vtermno = 0;
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udbg_putc = udbg_putcLP;
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udbg_getc = udbg_getcLP;
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udbg_getc_poll = udbg_getc_pollLP;
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}
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/* returns 0 if couldn't find or use /chosen/stdout as console */
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void __init find_udbg_vterm(void)
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{
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struct device_node *stdout_node;
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const u32 *termno;
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const char *name;
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int add_console;
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/* find the boot console from /chosen/stdout */
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if (!of_chosen)
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return;
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name = of_get_property(of_chosen, "linux,stdout-path", NULL);
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if (name == NULL)
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return;
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stdout_node = of_find_node_by_path(name);
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if (!stdout_node)
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return;
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name = of_get_property(stdout_node, "name", NULL);
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if (!name) {
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printk(KERN_WARNING "stdout node missing 'name' property!\n");
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goto out;
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}
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/* The user has requested a console so this is already set up. */
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add_console = !strstr(cmd_line, "console=");
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/* Check if it's a virtual terminal */
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if (strncmp(name, "vty", 3) != 0)
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goto out;
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termno = of_get_property(stdout_node, "reg", NULL);
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if (termno == NULL)
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goto out;
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vtermno = termno[0];
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if (of_device_is_compatible(stdout_node, "hvterm1")) {
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udbg_putc = udbg_putcLP;
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udbg_getc = udbg_getcLP;
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udbg_getc_poll = udbg_getc_pollLP;
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if (add_console)
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add_preferred_console("hvc", termno[0] & 0xff, NULL);
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} else if (of_device_is_compatible(stdout_node, "hvterm-protocol")) {
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vtermno = termno[0];
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udbg_putc = udbg_hvsi_putc;
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udbg_getc = udbg_hvsi_getc;
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udbg_getc_poll = udbg_hvsi_getc_poll;
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if (add_console)
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add_preferred_console("hvsi", termno[0] & 0xff, NULL);
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}
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out:
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of_node_put(stdout_node);
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}
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void vpa_init(int cpu)
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{
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int hwcpu = get_hard_smp_processor_id(cpu);
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unsigned long addr;
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long ret;
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if (cpu_has_feature(CPU_FTR_ALTIVEC))
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lppaca[cpu].vmxregs_in_use = 1;
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addr = __pa(&lppaca[cpu]);
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ret = register_vpa(hwcpu, addr);
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if (ret) {
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printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
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"cpu %d (hw %d) of area %lx returns %ld\n",
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cpu, hwcpu, addr, ret);
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return;
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}
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/*
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* PAPR says this feature is SLB-Buffer but firmware never
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* reports that. All SPLPAR support SLB shadow buffer.
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*/
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addr = __pa(&slb_shadow[cpu]);
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if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
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ret = register_slb_shadow(hwcpu, addr);
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if (ret)
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printk(KERN_ERR
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"WARNING: vpa_init: SLB shadow buffer "
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"registration for cpu %d (hw %d) of area %lx "
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"returns %ld\n", cpu, hwcpu, addr, ret);
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}
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}
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static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
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unsigned long va, unsigned long pa,
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unsigned long rflags, unsigned long vflags,
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int psize, int ssize)
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{
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unsigned long lpar_rc;
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unsigned long flags;
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unsigned long slot;
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unsigned long hpte_v, hpte_r;
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if (!(vflags & HPTE_V_BOLTED))
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DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, "
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"rflags=%lx, vflags=%lx, psize=%d)\n",
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hpte_group, va, pa, rflags, vflags, psize);
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hpte_v = hpte_encode_v(va, psize, ssize) | vflags | HPTE_V_VALID;
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hpte_r = hpte_encode_r(pa, psize) | rflags;
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if (!(vflags & HPTE_V_BOLTED))
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DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
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/* Now fill in the actual HPTE */
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/* Set CEC cookie to 0 */
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/* Zero page = 0 */
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/* I-cache Invalidate = 0 */
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/* I-cache synchronize = 0 */
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/* Exact = 0 */
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flags = 0;
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/* Make pHyp happy */
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if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
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hpte_r &= ~_PAGE_COHERENT;
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lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
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if (unlikely(lpar_rc == H_PTEG_FULL)) {
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if (!(vflags & HPTE_V_BOLTED))
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DBG_LOW(" full\n");
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return -1;
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}
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/*
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* Since we try and ioremap PHBs we don't own, the pte insert
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* will fail. However we must catch the failure in hash_page
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* or we will loop forever, so return -2 in this case.
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*/
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if (unlikely(lpar_rc != H_SUCCESS)) {
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if (!(vflags & HPTE_V_BOLTED))
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DBG_LOW(" lpar err %d\n", lpar_rc);
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return -2;
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}
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if (!(vflags & HPTE_V_BOLTED))
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DBG_LOW(" -> slot: %d\n", slot & 7);
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/* Because of iSeries, we have to pass down the secondary
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* bucket bit here as well
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*/
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return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
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}
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static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
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static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
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{
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unsigned long slot_offset;
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unsigned long lpar_rc;
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int i;
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unsigned long dummy1, dummy2;
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/* pick a random slot to start at */
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slot_offset = mftb() & 0x7;
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for (i = 0; i < HPTES_PER_GROUP; i++) {
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/* don't remove a bolted entry */
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lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
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(0x1UL << 4), &dummy1, &dummy2);
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if (lpar_rc == H_SUCCESS)
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return i;
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BUG_ON(lpar_rc != H_NOT_FOUND);
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slot_offset++;
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slot_offset &= 0x7;
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}
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return -1;
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}
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static void pSeries_lpar_hptab_clear(void)
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{
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unsigned long size_bytes = 1UL << ppc64_pft_size;
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unsigned long hpte_count = size_bytes >> 4;
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unsigned long dummy1, dummy2, dword0;
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long lpar_rc;
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int i;
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/* TODO: Use bulk call */
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for (i = 0; i < hpte_count; i++) {
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/* dont remove HPTEs with VRMA mappings */
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lpar_rc = plpar_pte_remove_raw(H_ANDCOND, i, HPTE_V_1TB_SEG,
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&dummy1, &dummy2);
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if (lpar_rc == H_NOT_FOUND) {
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lpar_rc = plpar_pte_read_raw(0, i, &dword0, &dummy1);
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if (!lpar_rc && ((dword0 & HPTE_V_VRMA_MASK)
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!= HPTE_V_VRMA_MASK))
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/* Can be hpte for 1TB Seg. So remove it */
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plpar_pte_remove_raw(0, i, 0, &dummy1, &dummy2);
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}
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}
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}
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/*
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* This computes the AVPN and B fields of the first dword of a HPTE,
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* for use when we want to match an existing PTE. The bottom 7 bits
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* of the returned value are zero.
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*/
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static inline unsigned long hpte_encode_avpn(unsigned long va, int psize,
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int ssize)
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{
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unsigned long v;
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v = (va >> 23) & ~(mmu_psize_defs[psize].avpnm);
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v <<= HPTE_V_AVPN_SHIFT;
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v |= ((unsigned long) ssize) << HPTE_V_SSIZE_SHIFT;
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return v;
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}
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/*
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* NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
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* the low 3 bits of flags happen to line up. So no transform is needed.
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* We can probably optimize here and assume the high bits of newpp are
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* already zero. For now I am paranoid.
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*/
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static long pSeries_lpar_hpte_updatepp(unsigned long slot,
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unsigned long newpp,
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unsigned long va,
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int psize, int ssize, int local)
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{
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unsigned long lpar_rc;
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unsigned long flags = (newpp & 7) | H_AVPN;
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unsigned long want_v;
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want_v = hpte_encode_avpn(va, psize, ssize);
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DBG_LOW(" update: avpnv=%016lx, hash=%016lx, f=%x, psize: %d ... ",
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want_v, slot, flags, psize);
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lpar_rc = plpar_pte_protect(flags, slot, want_v);
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if (lpar_rc == H_NOT_FOUND) {
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DBG_LOW("not found !\n");
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return -1;
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}
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DBG_LOW("ok\n");
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BUG_ON(lpar_rc != H_SUCCESS);
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return 0;
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}
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static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
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{
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unsigned long dword0;
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unsigned long lpar_rc;
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unsigned long dummy_word1;
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unsigned long flags;
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/* Read 1 pte at a time */
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/* Do not need RPN to logical page translation */
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/* No cross CEC PFT access */
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flags = 0;
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lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
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BUG_ON(lpar_rc != H_SUCCESS);
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return dword0;
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}
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static long pSeries_lpar_hpte_find(unsigned long va, int psize, int ssize)
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{
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unsigned long hash;
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unsigned long i;
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long slot;
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unsigned long want_v, hpte_v;
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hash = hpt_hash(va, mmu_psize_defs[psize].shift, ssize);
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want_v = hpte_encode_avpn(va, psize, ssize);
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/* Bolted entries are always in the primary group */
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slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
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for (i = 0; i < HPTES_PER_GROUP; i++) {
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hpte_v = pSeries_lpar_hpte_getword0(slot);
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if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID))
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/* HPTE matches */
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return slot;
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++slot;
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}
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return -1;
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}
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static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
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unsigned long ea,
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int psize, int ssize)
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{
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unsigned long lpar_rc, slot, vsid, va, flags;
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vsid = get_kernel_vsid(ea, ssize);
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va = hpt_va(ea, vsid, ssize);
|
|
|
|
slot = pSeries_lpar_hpte_find(va, psize, ssize);
|
|
BUG_ON(slot == -1);
|
|
|
|
flags = newpp & 7;
|
|
lpar_rc = plpar_pte_protect(flags, slot, 0);
|
|
|
|
BUG_ON(lpar_rc != H_SUCCESS);
|
|
}
|
|
|
|
static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
|
|
int psize, int ssize, int local)
|
|
{
|
|
unsigned long want_v;
|
|
unsigned long lpar_rc;
|
|
unsigned long dummy1, dummy2;
|
|
|
|
DBG_LOW(" inval : slot=%lx, va=%016lx, psize: %d, local: %d",
|
|
slot, va, psize, local);
|
|
|
|
want_v = hpte_encode_avpn(va, psize, ssize);
|
|
lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
|
|
if (lpar_rc == H_NOT_FOUND)
|
|
return;
|
|
|
|
BUG_ON(lpar_rc != H_SUCCESS);
|
|
}
|
|
|
|
/* Flag bits for H_BULK_REMOVE */
|
|
#define HBR_REQUEST 0x4000000000000000UL
|
|
#define HBR_RESPONSE 0x8000000000000000UL
|
|
#define HBR_END 0xc000000000000000UL
|
|
#define HBR_AVPN 0x0200000000000000UL
|
|
#define HBR_ANDCOND 0x0100000000000000UL
|
|
|
|
/*
|
|
* Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
|
|
* lock.
|
|
*/
|
|
static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
|
|
{
|
|
unsigned long i, pix, rc;
|
|
unsigned long flags = 0;
|
|
struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
|
|
int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
|
|
unsigned long param[9];
|
|
unsigned long va;
|
|
unsigned long hash, index, shift, hidx, slot;
|
|
real_pte_t pte;
|
|
int psize, ssize;
|
|
|
|
if (lock_tlbie)
|
|
spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
|
|
|
|
psize = batch->psize;
|
|
ssize = batch->ssize;
|
|
pix = 0;
|
|
for (i = 0; i < number; i++) {
|
|
va = batch->vaddr[i];
|
|
pte = batch->pte[i];
|
|
pte_iterate_hashed_subpages(pte, psize, va, index, shift) {
|
|
hash = hpt_hash(va, shift, ssize);
|
|
hidx = __rpte_to_hidx(pte, index);
|
|
if (hidx & _PTEIDX_SECONDARY)
|
|
hash = ~hash;
|
|
slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
|
|
slot += hidx & _PTEIDX_GROUP_IX;
|
|
if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
|
|
pSeries_lpar_hpte_invalidate(slot, va, psize,
|
|
ssize, local);
|
|
} else {
|
|
param[pix] = HBR_REQUEST | HBR_AVPN | slot;
|
|
param[pix+1] = hpte_encode_avpn(va, psize,
|
|
ssize);
|
|
pix += 2;
|
|
if (pix == 8) {
|
|
rc = plpar_hcall9(H_BULK_REMOVE, param,
|
|
param[0], param[1], param[2],
|
|
param[3], param[4], param[5],
|
|
param[6], param[7]);
|
|
BUG_ON(rc != H_SUCCESS);
|
|
pix = 0;
|
|
}
|
|
}
|
|
} pte_iterate_hashed_end();
|
|
}
|
|
if (pix) {
|
|
param[pix] = HBR_END;
|
|
rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1],
|
|
param[2], param[3], param[4], param[5],
|
|
param[6], param[7]);
|
|
BUG_ON(rc != H_SUCCESS);
|
|
}
|
|
|
|
if (lock_tlbie)
|
|
spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
|
|
}
|
|
|
|
void __init hpte_init_lpar(void)
|
|
{
|
|
ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate;
|
|
ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp;
|
|
ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
|
|
ppc_md.hpte_insert = pSeries_lpar_hpte_insert;
|
|
ppc_md.hpte_remove = pSeries_lpar_hpte_remove;
|
|
ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
|
|
ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear;
|
|
}
|