535 lines
13 KiB
C
535 lines
13 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/config.h>
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#include <linux/kernel.h>
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#include <linux/dma-mapping.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/abs_addr.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 pSeries_hvCall.S */
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EXPORT_SYMBOL(plpar_hcall);
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EXPORT_SYMBOL(plpar_hcall_4out);
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EXPORT_SYMBOL(plpar_hcall_norets);
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EXPORT_SYMBOL(plpar_hcall_8arg_2ret);
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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(unsigned 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 unsigned char 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(unsigned 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 unsigned char 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 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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int find_udbg_vterm(void)
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{
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struct device_node *stdout_node;
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u32 *termno;
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char *name;
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int found = 0;
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/* find the boot console from /chosen/stdout */
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if (!of_chosen)
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return 0;
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name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
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if (name == NULL)
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return 0;
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stdout_node = of_find_node_by_path(name);
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if (!stdout_node)
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return 0;
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/* now we have the stdout node; figure out what type of device it is. */
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name = (char *)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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if (strncmp(name, "vty", 3) == 0) {
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if (device_is_compatible(stdout_node, "hvterm1")) {
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termno = (u32 *)get_property(stdout_node, "reg", NULL);
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if (termno) {
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vtermno = termno[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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found = 1;
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}
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} else if (device_is_compatible(stdout_node, "hvterm-protocol")) {
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termno = (u32 *)get_property(stdout_node, "reg", NULL);
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if (termno) {
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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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found = 1;
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}
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}
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} else if (strncmp(name, "serial", 6)) {
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/* XXX fix ISA serial console */
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printk(KERN_WARNING "serial stdout on LPAR ('%s')! "
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"can't print udbg messages\n",
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stdout_node->full_name);
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} else {
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printk(KERN_WARNING "don't know how to print to stdout '%s'\n",
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stdout_node->full_name);
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}
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out:
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of_node_put(stdout_node);
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return found;
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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 vpa = __pa(&paca[cpu].lppaca);
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long ret;
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if (cpu_has_feature(CPU_FTR_ALTIVEC))
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paca[cpu].lppaca.vmxregs_in_use = 1;
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ret = register_vpa(hwcpu, vpa);
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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, vpa, ret);
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}
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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)
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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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unsigned long dummy0, dummy1;
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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) | 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_hcall(H_ENTER, flags, hpte_group, hpte_v,
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hpte_r, &slot, &dummy0, &dummy1);
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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;
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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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plpar_pte_remove(0, i, 0, &dummy1, &dummy2);
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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 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_v(va, psize);
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DBG_LOW(" update: avpnv=%016lx, hash=%016lx, f=%x, psize: %d ... ",
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want_v & HPTE_V_AVPN, slot, flags, psize);
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lpar_rc = plpar_pte_protect(flags, slot, want_v & HPTE_V_AVPN);
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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)
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{
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unsigned long hash;
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unsigned long i, j;
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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);
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want_v = hpte_encode_v(va, psize);
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for (j = 0; j < 2; j++) {
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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)
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&& (hpte_v & HPTE_V_VALID)
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&& (!!(hpte_v & HPTE_V_SECONDARY) == j)) {
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/* HPTE matches */
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if (j)
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slot = -slot;
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return slot;
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}
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++slot;
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}
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hash = ~hash;
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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)
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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);
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va = (vsid << 28) | (ea & 0x0fffffff);
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slot = pSeries_lpar_hpte_find(va, psize);
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BUG_ON(slot == -1);
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flags = newpp & 7;
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lpar_rc = plpar_pte_protect(flags, slot, 0);
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BUG_ON(lpar_rc != H_Success);
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}
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static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
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int psize, int local)
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{
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unsigned long want_v;
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unsigned long lpar_rc;
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unsigned long dummy1, dummy2;
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DBG_LOW(" inval : slot=%lx, va=%016lx, psize: %d, local: %d",
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slot, va, psize, local);
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want_v = hpte_encode_v(va, psize);
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lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v & HPTE_V_AVPN,
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&dummy1, &dummy2);
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if (lpar_rc == H_Not_Found)
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return;
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BUG_ON(lpar_rc != H_Success);
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}
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/*
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* Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
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* lock.
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*/
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void pSeries_lpar_flush_hash_range(unsigned long number, int local)
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{
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int i;
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unsigned long flags = 0;
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struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
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int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
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if (lock_tlbie)
|
|
spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
|
|
|
|
for (i = 0; i < number; i++)
|
|
flush_hash_page(batch->vaddr[i], batch->pte[i],
|
|
batch->psize, local);
|
|
|
|
if (lock_tlbie)
|
|
spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
|
|
}
|
|
|
|
void 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;
|
|
|
|
htab_finish_init();
|
|
}
|