--- /dev/null
+/*
+ * 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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