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linux/arch/powerpc/platforms/pseries/lpar.c

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/*
* pSeries_lpar.c
* Copyright (C) 2001 Todd Inglett, IBM Corporation
*
* pSeries LPAR support.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#undef DEBUG_LOW
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/dma-mapping.h>
#include <linux/console.h>
#include <asm/processor.h>
#include <asm/mmu.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/machdep.h>
#include <asm/abs_addr.h>
#include <asm/mmu_context.h>
#include <asm/iommu.h>
#include <asm/tlbflush.h>
#include <asm/tlb.h>
#include <asm/prom.h>
#include <asm/abs_addr.h>
#include <asm/cputable.h>
#include <asm/udbg.h>
#include <asm/smp.h>
#include "plpar_wrappers.h"
#ifdef DEBUG_LOW
#define DBG_LOW(fmt...) do { udbg_printf(fmt); } while(0)
#else
#define DBG_LOW(fmt...) do { } while(0)
#endif
/* in pSeries_hvCall.S */
EXPORT_SYMBOL(plpar_hcall);
EXPORT_SYMBOL(plpar_hcall_4out);
EXPORT_SYMBOL(plpar_hcall_norets);
EXPORT_SYMBOL(plpar_hcall_8arg_2ret);
EXPORT_SYMBOL(plpar_hcall_7arg_7ret);
EXPORT_SYMBOL(plpar_hcall_9arg_9ret);
extern void pSeries_find_serial_port(void);
int vtermno; /* virtual terminal# for udbg */
#define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
static void udbg_hvsi_putc(char c)
{
/* packet's seqno isn't used anyways */
uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c };
int rc;
if (c == '\n')
udbg_hvsi_putc('\r');
do {
rc = plpar_put_term_char(vtermno, sizeof(packet), packet);
} while (rc == H_BUSY);
}
static long hvsi_udbg_buf_len;
static uint8_t hvsi_udbg_buf[256];
static int udbg_hvsi_getc_poll(void)
{
unsigned char ch;
int rc, i;
if (hvsi_udbg_buf_len == 0) {
rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf);
if (rc != H_SUCCESS || hvsi_udbg_buf[0] != 0xff) {
/* bad read or non-data packet */
hvsi_udbg_buf_len = 0;
} else {
/* remove the packet header */
for (i = 4; i < hvsi_udbg_buf_len; i++)
hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i];
hvsi_udbg_buf_len -= 4;
}
}
if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) {
/* no data ready */
hvsi_udbg_buf_len = 0;
return -1;
}
ch = hvsi_udbg_buf[0];
/* shift remaining data down */
for (i = 1; i < hvsi_udbg_buf_len; i++) {
hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i];
}
hvsi_udbg_buf_len--;
return ch;
}
static int udbg_hvsi_getc(void)
{
int ch;
for (;;) {
ch = udbg_hvsi_getc_poll();
if (ch == -1) {
/* This shouldn't be needed...but... */
volatile unsigned long delay;
for (delay=0; delay < 2000000; delay++)
;
} else {
return ch;
}
}
}
static void udbg_putcLP(char c)
{
char buf[16];
unsigned long rc;
if (c == '\n')
udbg_putcLP('\r');
buf[0] = c;
do {
rc = plpar_put_term_char(vtermno, 1, buf);
} while(rc == H_BUSY);
}
/* Buffered chars getc */
static long inbuflen;
static long inbuf[2]; /* must be 2 longs */
static int udbg_getc_pollLP(void)
{
/* The interface is tricky because it may return up to 16 chars.
* We save them statically for future calls to udbg_getc().
*/
char ch, *buf = (char *)inbuf;
int i;
long rc;
if (inbuflen == 0) {
/* get some more chars. */
inbuflen = 0;
rc = plpar_get_term_char(vtermno, &inbuflen, buf);
if (rc != H_SUCCESS)
inbuflen = 0; /* otherwise inbuflen is garbage */
}
if (inbuflen <= 0 || inbuflen > 16) {
/* Catch error case as well as other oddities (corruption) */
inbuflen = 0;
return -1;
}
ch = buf[0];
for (i = 1; i < inbuflen; i++) /* shuffle them down. */
buf[i-1] = buf[i];
inbuflen--;
return ch;
}
static int udbg_getcLP(void)
{
int ch;
for (;;) {
ch = udbg_getc_pollLP();
if (ch == -1) {
/* This shouldn't be needed...but... */
volatile unsigned long delay;
for (delay=0; delay < 2000000; delay++)
;
} else {
return ch;
}
}
}
/* call this from early_init() for a working debug console on
* vterm capable LPAR machines
*/
void __init udbg_init_debug_lpar(void)
{
vtermno = 0;
udbg_putc = udbg_putcLP;
udbg_getc = udbg_getcLP;
udbg_getc_poll = udbg_getc_pollLP;
}
/* returns 0 if couldn't find or use /chosen/stdout as console */
void __init find_udbg_vterm(void)
{
struct device_node *stdout_node;
u32 *termno;
char *name;
int add_console;
/* find the boot console from /chosen/stdout */
if (!of_chosen)
return;
name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
if (name == NULL)
return;
stdout_node = of_find_node_by_path(name);
if (!stdout_node)
return;
name = (char *)get_property(stdout_node, "name", NULL);
if (!name) {
printk(KERN_WARNING "stdout node missing 'name' property!\n");
goto out;
}
/* The user has requested a console so this is already set up. */
add_console = !strstr(cmd_line, "console=");
/* Check if it's a virtual terminal */
if (strncmp(name, "vty", 3) != 0)
goto out;
termno = (u32 *)get_property(stdout_node, "reg", NULL);
if (termno == NULL)
goto out;
vtermno = termno[0];
if (device_is_compatible(stdout_node, "hvterm1")) {
udbg_putc = udbg_putcLP;
udbg_getc = udbg_getcLP;
udbg_getc_poll = udbg_getc_pollLP;
if (add_console)
add_preferred_console("hvc", termno[0] & 0xff, NULL);
} else if (device_is_compatible(stdout_node, "hvterm-protocol")) {
vtermno = termno[0];
udbg_putc = udbg_hvsi_putc;
udbg_getc = udbg_hvsi_getc;
udbg_getc_poll = udbg_hvsi_getc_poll;
if (add_console)
add_preferred_console("hvsi", termno[0] & 0xff, NULL);
}
out:
of_node_put(stdout_node);
}
void vpa_init(int cpu)
{
int hwcpu = get_hard_smp_processor_id(cpu);
unsigned long vpa = __pa(&lppaca[cpu]);
long ret;
if (cpu_has_feature(CPU_FTR_ALTIVEC))
lppaca[cpu].vmxregs_in_use = 1;
ret = register_vpa(hwcpu, vpa);
if (ret)
printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
"cpu %d (hw %d) of area %lx returns %ld\n",
cpu, hwcpu, vpa, ret);
}
long pSeries_lpar_hpte_insert(unsigned long hpte_group,
unsigned long va, unsigned long pa,
unsigned long rflags, unsigned long vflags,
int psize)
{
unsigned long lpar_rc;
unsigned long flags;
unsigned long slot;
unsigned long hpte_v, hpte_r;
unsigned long dummy0, dummy1;
if (!(vflags & HPTE_V_BOLTED))
DBG_LOW("hpte_insert(group=%lx, va=%016lx, pa=%016lx, "
"rflags=%lx, vflags=%lx, psize=%d)\n",
hpte_group, va, pa, rflags, vflags, psize);
hpte_v = hpte_encode_v(va, psize) | vflags | HPTE_V_VALID;
hpte_r = hpte_encode_r(pa, psize) | rflags;
if (!(vflags & HPTE_V_BOLTED))
DBG_LOW(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r);
/* Now fill in the actual HPTE */
/* Set CEC cookie to 0 */
/* Zero page = 0 */
/* I-cache Invalidate = 0 */
/* I-cache synchronize = 0 */
/* Exact = 0 */
flags = 0;
/* Make pHyp happy */
if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
hpte_r &= ~_PAGE_COHERENT;
lpar_rc = plpar_hcall(H_ENTER, flags, hpte_group, hpte_v,
hpte_r, &slot, &dummy0, &dummy1);
if (unlikely(lpar_rc == H_PTEG_FULL)) {
if (!(vflags & HPTE_V_BOLTED))
DBG_LOW(" full\n");
return -1;
}
/*
* Since we try and ioremap PHBs we don't own, the pte insert
* will fail. However we must catch the failure in hash_page
* or we will loop forever, so return -2 in this case.
*/
if (unlikely(lpar_rc != H_SUCCESS)) {
if (!(vflags & HPTE_V_BOLTED))
DBG_LOW(" lpar err %d\n", lpar_rc);
return -2;
}
if (!(vflags & HPTE_V_BOLTED))
DBG_LOW(" -> slot: %d\n", slot & 7);
/* Because of iSeries, we have to pass down the secondary
* bucket bit here as well
*/
return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
}
static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
{
unsigned long slot_offset;
unsigned long lpar_rc;
int i;
unsigned long dummy1, dummy2;
/* pick a random slot to start at */
slot_offset = mftb() & 0x7;
for (i = 0; i < HPTES_PER_GROUP; i++) {
/* don't remove a bolted entry */
lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
(0x1UL << 4), &dummy1, &dummy2);
if (lpar_rc == H_SUCCESS)
return i;
BUG_ON(lpar_rc != H_NOT_FOUND);
slot_offset++;
slot_offset &= 0x7;
}
return -1;
}
static void pSeries_lpar_hptab_clear(void)
{
unsigned long size_bytes = 1UL << ppc64_pft_size;
unsigned long hpte_count = size_bytes >> 4;
unsigned long dummy1, dummy2;
int i;
/* TODO: Use bulk call */
for (i = 0; i < hpte_count; i++)
plpar_pte_remove(0, i, 0, &dummy1, &dummy2);
}
/*
* NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
* the low 3 bits of flags happen to line up. So no transform is needed.
* We can probably optimize here and assume the high bits of newpp are
* already zero. For now I am paranoid.
*/
static long pSeries_lpar_hpte_updatepp(unsigned long slot,
unsigned long newpp,
unsigned long va,
int psize, int local)
{
unsigned long lpar_rc;
unsigned long flags = (newpp & 7) | H_AVPN;
unsigned long want_v;
want_v = hpte_encode_v(va, psize);
DBG_LOW(" update: avpnv=%016lx, hash=%016lx, f=%x, psize: %d ... ",
want_v & HPTE_V_AVPN, slot, flags, psize);
lpar_rc = plpar_pte_protect(flags, slot, want_v & HPTE_V_AVPN);
if (lpar_rc == H_NOT_FOUND) {
DBG_LOW("not found !\n");
return -1;
}
DBG_LOW("ok\n");
BUG_ON(lpar_rc != H_SUCCESS);
return 0;
}
static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
{
unsigned long dword0;
unsigned long lpar_rc;
unsigned long dummy_word1;
unsigned long flags;
/* Read 1 pte at a time */
/* Do not need RPN to logical page translation */
/* No cross CEC PFT access */
flags = 0;
lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
BUG_ON(lpar_rc != H_SUCCESS);
return dword0;
}
static long pSeries_lpar_hpte_find(unsigned long va, int psize)
{
unsigned long hash;
unsigned long i, j;
long slot;
unsigned long want_v, hpte_v;
hash = hpt_hash(va, mmu_psize_defs[psize].shift);
want_v = hpte_encode_v(va, psize);
for (j = 0; j < 2; j++) {
slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
for (i = 0; i < HPTES_PER_GROUP; i++) {
hpte_v = pSeries_lpar_hpte_getword0(slot);
if (HPTE_V_COMPARE(hpte_v, want_v)
&& (hpte_v & HPTE_V_VALID)
&& (!!(hpte_v & HPTE_V_SECONDARY) == j)) {
/* HPTE matches */
if (j)
slot = -slot;
return slot;
}
++slot;
}
hash = ~hash;
}
return -1;
}
static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
unsigned long ea,
int psize)
{
unsigned long lpar_rc, slot, vsid, va, flags;
vsid = get_kernel_vsid(ea);
va = (vsid << 28) | (ea & 0x0fffffff);
slot = pSeries_lpar_hpte_find(va, psize);
BUG_ON(slot == -1);
flags = newpp & 7;
lpar_rc = plpar_pte_protect(flags, slot, 0);
BUG_ON(lpar_rc != H_SUCCESS);
}
static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
int psize, int local)
{
unsigned long want_v;
unsigned long lpar_rc;
unsigned long dummy1, dummy2;
DBG_LOW(" inval : slot=%lx, va=%016lx, psize: %d, local: %d",
slot, va, psize, local);
want_v = hpte_encode_v(va, psize);
lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v & HPTE_V_AVPN,
&dummy1, &dummy2);
if (lpar_rc == H_NOT_FOUND)
return;
BUG_ON(lpar_rc != H_SUCCESS);
}
/*
* Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
* lock.
*/
void pSeries_lpar_flush_hash_range(unsigned long number, int local)
{
int i;
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);
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();
}
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