664 lines
16 KiB
C
664 lines
16 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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/* Enables debugging of low-level hash table routines - careful! */
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#undef DEBUG
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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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#include "pseries.h"
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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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static 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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register_early_udbg_console();
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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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/* 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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/* 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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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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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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pr_devel("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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pr_devel(" 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_NO_CACHE) & !(rflags & _PAGE_WRITETHRU))
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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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pr_devel(" 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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pr_devel(" lpar err %lu\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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pr_devel(" -> slot: %lu\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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pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, 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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pr_devel("not found !\n");
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return -1;
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}
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pr_devel("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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|
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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);
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slot = pSeries_lpar_hpte_find(va, psize, ssize);
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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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|
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static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
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int psize, int ssize, 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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|
|
pr_devel(" inval : slot=%lx, va=%016lx, psize: %d, local: %d\n",
|
|
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);
|
|
}
|
|
|
|
static void pSeries_lpar_hpte_removebolted(unsigned long ea,
|
|
int psize, int ssize)
|
|
{
|
|
unsigned long slot, vsid, va;
|
|
|
|
vsid = get_kernel_vsid(ea, ssize);
|
|
va = hpt_va(ea, vsid, ssize);
|
|
|
|
slot = pSeries_lpar_hpte_find(va, psize, ssize);
|
|
BUG_ON(slot == -1);
|
|
|
|
pSeries_lpar_hpte_invalidate(slot, va, psize, ssize, 0);
|
|
}
|
|
|
|
/* 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.hpte_removebolted = pSeries_lpar_hpte_removebolted;
|
|
ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
|
|
ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear;
|
|
}
|
|
|
|
#ifdef CONFIG_PPC_SMLPAR
|
|
#define CMO_FREE_HINT_DEFAULT 1
|
|
static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT;
|
|
|
|
static int __init cmo_free_hint(char *str)
|
|
{
|
|
char *parm;
|
|
parm = strstrip(str);
|
|
|
|
if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) {
|
|
printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n");
|
|
cmo_free_hint_flag = 0;
|
|
return 1;
|
|
}
|
|
|
|
cmo_free_hint_flag = 1;
|
|
printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n");
|
|
|
|
if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
__setup("cmo_free_hint=", cmo_free_hint);
|
|
|
|
static void pSeries_set_page_state(struct page *page, int order,
|
|
unsigned long state)
|
|
{
|
|
int i, j;
|
|
unsigned long cmo_page_sz, addr;
|
|
|
|
cmo_page_sz = cmo_get_page_size();
|
|
addr = __pa((unsigned long)page_address(page));
|
|
|
|
for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) {
|
|
for (j = 0; j < PAGE_SIZE; j += cmo_page_sz)
|
|
plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0);
|
|
}
|
|
}
|
|
|
|
void arch_free_page(struct page *page, int order)
|
|
{
|
|
if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO))
|
|
return;
|
|
|
|
pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED);
|
|
}
|
|
EXPORT_SYMBOL(arch_free_page);
|
|
|
|
#endif
|