532 lines
12 KiB
C
532 lines
12 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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#define DEBUG
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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/ppcdebug.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/plpar_wrappers.h>
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#ifdef DEBUG
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#define DBG(fmt...) udbg_printf(fmt)
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#else
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#define DBG(fmt...)
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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 fw_feature_init(void);
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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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ppc_md.udbg_putc = udbg_putcLP;
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ppc_md.udbg_getc = udbg_getcLP;
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ppc_md.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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ppc_md.udbg_putc = udbg_putcLP;
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ppc_md.udbg_getc = udbg_getcLP;
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ppc_md.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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ppc_md.udbg_putc = udbg_hvsi_putc;
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ppc_md.udbg_getc = udbg_hvsi_getc;
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ppc_md.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 = (unsigned long)&(paca[cpu].lppaca);
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long ret;
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unsigned long flags;
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/* Register the Virtual Processor Area (VPA) */
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flags = 1UL << (63 - 18);
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ret = register_vpa(flags, hwcpu, __pa(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, __pa(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 prpn,
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int secondary, unsigned long hpteflags,
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int bolted, int large)
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{
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unsigned long arpn = physRpn_to_absRpn(prpn);
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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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HPTE lhpte;
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unsigned long dummy0, dummy1;
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/* Fill in the local HPTE with absolute rpn, avpn and flags */
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lhpte.dw1.dword1 = 0;
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lhpte.dw1.dw1.rpn = arpn;
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lhpte.dw1.flags.flags = hpteflags;
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lhpte.dw0.dword0 = 0;
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lhpte.dw0.dw0.avpn = va >> 23;
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lhpte.dw0.dw0.h = secondary;
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lhpte.dw0.dw0.bolted = bolted;
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lhpte.dw0.dw0.v = 1;
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if (large) {
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lhpte.dw0.dw0.l = 1;
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lhpte.dw0.dw0.avpn &= ~0x1UL;
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}
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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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/* XXX why is this here? - Anton */
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if (hpteflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
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lhpte.dw1.flags.flags &= ~_PAGE_COHERENT;
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lpar_rc = plpar_hcall(H_ENTER, flags, hpte_group, lhpte.dw0.dword0,
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lhpte.dw1.dword1, &slot, &dummy0, &dummy1);
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if (unlikely(lpar_rc == H_PTEG_Full))
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return -1;
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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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return -2;
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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) | (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, unsigned long newpp,
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unsigned long va, int large, 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 avpn = va >> 23;
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if (large)
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avpn &= ~0x1UL;
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lpar_rc = plpar_pte_protect(flags, slot, (avpn << 7));
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if (lpar_rc == H_Not_Found)
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return -1;
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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 vpn)
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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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union {
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unsigned long dword0;
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Hpte_dword0 dw0;
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} hpte_dw0;
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Hpte_dword0 dw0;
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hash = hpt_hash(vpn, 0);
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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_dw0.dword0 = pSeries_lpar_hpte_getword0(slot);
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dw0 = hpte_dw0.dw0;
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if ((dw0.avpn == (vpn >> 11)) && dw0.v &&
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(dw0.h == 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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{
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unsigned long lpar_rc;
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unsigned long vsid, va, vpn, flags;
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long slot;
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vsid = get_kernel_vsid(ea);
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va = (vsid << 28) | (ea & 0x0fffffff);
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vpn = va >> PAGE_SHIFT;
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slot = pSeries_lpar_hpte_find(vpn);
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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 large, int local)
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{
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unsigned long avpn = va >> 23;
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unsigned long lpar_rc;
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unsigned long dummy1, dummy2;
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if (large)
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avpn &= ~0x1UL;
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lpar_rc = plpar_pte_remove(H_AVPN, slot, (avpn << 7), &dummy1,
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&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 context, unsigned long number,
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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)
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spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
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for (i = 0; i < number; i++)
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flush_hash_page(context, batch->addr[i], batch->pte[i], local);
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if (lock_tlbie)
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spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
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}
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void hpte_init_lpar(void)
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{
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ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate;
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ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp;
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ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
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ppc_md.hpte_insert = pSeries_lpar_hpte_insert;
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ppc_md.hpte_remove = pSeries_lpar_hpte_remove;
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ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
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ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear;
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htab_finish_init();
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}
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