[PATCH 9/16] powerpc: add ps3 platform htab routines
Geoff Levand
geoffrey.levand at am.sony.com
Fri Nov 17 14:43:21 EST 2006
Pagetable management routines for ps3pf.
Signed-off-by: Geoff Levand <geoffrey.levand at am.sony.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann at de.ibm.com>
---
arch/powerpc/platforms/ps3pf/htab.c | 277 ++++++++++++++++++++++++++++++++++++
1 file changed, 277 insertions(+)
Index: cell--common--6/arch/powerpc/platforms/ps3pf/htab.c
===================================================================
--- /dev/null
+++ cell--common--6/arch/powerpc/platforms/ps3pf/htab.c
@@ -0,0 +1,277 @@
+/*
+ * PS3 Platform pagetable management.
+ *
+ * Copyright (C) 2006 Sony Computer Entertainment Inc.
+ * Copyright 2006 Sony Corp.
+ *
+ * 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; version 2 of the License.
+ *
+ * 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
+ */
+
+#include <linux/kernel.h>
+
+#include <asm/machdep.h>
+#include <asm/lmb.h>
+#include <asm/udbg.h>
+#include <asm/ps3pf.h>
+#include <asm/lv1call.h>
+
+#include "platform.h"
+
+#if defined(DEBUG)
+#define DBG(fmt...) udbg_printf(fmt)
+#else
+#define DBG(fmt...) do{if(0)printk(fmt);}while(0)
+#endif
+
+static hpte_t *htab;
+static unsigned long htab_addr;
+static unsigned char *bolttab;
+static unsigned char *inusetab;
+
+static spinlock_t ps3pf_bolttab_lock = SPIN_LOCK_UNLOCKED;
+
+#define debug_dump_hpte(_a, _b, _c, _d, _e, _f, _g) \
+ _debug_dump_hpte(_a, _b, _c, _d, _e, _f, _g, __func__, __LINE__)
+static void _debug_dump_hpte(unsigned long pa, unsigned long va,
+ unsigned long group, unsigned long bitmap, hpte_t lhpte, int psize,
+ unsigned long slot, const char* func, int line)
+{
+ DBG("%s:%d: pa = %lxh\n", func, line, pa);
+ DBG("%s:%d: lpar = %lxh\n", func, line,
+ ps3pf_mm_phys_to_lpar(pa));
+ DBG("%s:%d: va = %lxh\n", func, line, va);
+ DBG("%s:%d: group = %lxh\n", func, line, group);
+ DBG("%s:%d: bitmap = %lxh\n", func, line, bitmap);
+ DBG("%s:%d: hpte.v = %lxh\n", func, line, lhpte.v);
+ DBG("%s:%d: hpte.r = %lxh\n", func, line, lhpte.r);
+ DBG("%s:%d: psize = %xh\n", func, line, psize);
+ DBG("%s:%d: slot = %lxh\n", func, line, slot);
+}
+
+static long ps3pf_hpte_insert(unsigned long hpte_group, unsigned long va,
+ unsigned long pa, unsigned long rflags, unsigned long vflags, int psize)
+{
+ unsigned long slot;
+ hpte_t lhpte;
+ int secondary = 0;
+ unsigned long result;
+ unsigned long bitmap;
+ unsigned long flags;
+ unsigned long p_pteg, s_pteg, b_index, b_mask, cb, ci;
+
+ vflags &= ~HPTE_V_SECONDARY; /* this bit is ignored */
+
+ lhpte.v = hpte_encode_v(va, psize) | vflags | HPTE_V_VALID;
+ lhpte.r = hpte_encode_r(ps3pf_mm_phys_to_lpar(pa), psize) | rflags;
+
+ p_pteg = hpte_group / HPTES_PER_GROUP;
+ s_pteg = ~p_pteg & htab_hash_mask;
+
+ spin_lock_irqsave(&ps3pf_bolttab_lock, flags);
+
+ BUG_ON(bolttab[p_pteg] == 0xff && bolttab[s_pteg] == 0xff);
+
+ bitmap = (inusetab[p_pteg] << 8) | inusetab[s_pteg];
+
+ if (bitmap == 0xffff) {
+ /*
+ * PTEG is full. Search for victim.
+ */
+ bitmap &= ~((bolttab[p_pteg] << 8) | bolttab[s_pteg]);
+ do {
+ ci = mftb() & 15;
+ cb = 0x8000UL >> ci;
+ } while ((cb & bitmap) == 0);
+ } else {
+ /*
+ * search free slot in hardware order
+ * [primary] 0, 2, 4, 6, 1, 3, 5, 7
+ * [secondary] 0, 2, 4, 6, 1, 3, 5, 7
+ */
+ for (ci = 0; ci < HPTES_PER_GROUP; ci += 2) {
+ cb = 0x8000UL >> ci;
+ if ((cb & bitmap) == 0)
+ goto found;
+ }
+ for (ci = 1; ci < HPTES_PER_GROUP; ci += 2) {
+ cb = 0x8000UL >> ci;
+ if ((cb & bitmap) == 0)
+ goto found;
+ }
+ for (ci = HPTES_PER_GROUP; ci < HPTES_PER_GROUP*2; ci += 2) {
+ cb = 0x8000UL >> ci;
+ if ((cb & bitmap) == 0)
+ goto found;
+ }
+ for (ci = HPTES_PER_GROUP+1; ci < HPTES_PER_GROUP*2; ci += 2) {
+ cb = 0x8000UL >> ci;
+ if ((cb & bitmap) == 0)
+ goto found;
+ }
+ }
+
+found:
+ if (ci < HPTES_PER_GROUP) {
+ slot = p_pteg * HPTES_PER_GROUP + ci;
+ } else {
+ slot = s_pteg * HPTES_PER_GROUP + (ci & 7);
+ /* lhpte.dw0.dw0.h = 1; */
+ vflags |= HPTE_V_SECONDARY;
+ lhpte.v |= HPTE_V_SECONDARY;
+ }
+
+ result = lv1_write_htab_entry(0, slot, lhpte.v, lhpte.r);
+
+ if (result) {
+ debug_dump_hpte(pa, va, hpte_group, bitmap, lhpte, psize, slot);
+ BUG();
+ }
+
+ /*
+ * If used slot is not in primary HPTE group,
+ * the slot should be in secondary HPTE group.
+ */
+
+ if ((hpte_group ^ slot) & ~(HPTES_PER_GROUP - 1)) {
+ secondary = 1;
+ b_index = s_pteg;
+ } else {
+ secondary = 0;
+ b_index = p_pteg;
+ }
+
+ b_mask = (lhpte.v & HPTE_V_BOLTED) ? 1 << 7 : 0 << 7;
+ bolttab[b_index] |= b_mask >> (slot & 7);
+ b_mask = 1 << 7;
+ inusetab[b_index] |= b_mask >> (slot & 7);
+ spin_unlock_irqrestore(&ps3pf_bolttab_lock, flags);
+
+ return (slot & 7) | (secondary << 3);
+}
+
+static long ps3pf_hpte_remove(unsigned long hpte_group)
+{
+ panic("ps3pf_hpte_remove() not implemented");
+ return 0;
+}
+
+static long ps3pf_hpte_updatepp(unsigned long slot, unsigned long newpp,
+ unsigned long va, int psize, int local)
+{
+ unsigned long flags;
+ unsigned long result;
+ unsigned long pteg, bit;
+ unsigned long hpte_v, want_v;
+
+ want_v = hpte_encode_v(va, psize);
+
+ spin_lock_irqsave(&ps3pf_bolttab_lock, flags);
+
+ hpte_v = htab[slot].v;
+ if (!HPTE_V_COMPARE(hpte_v, want_v) || !(hpte_v & HPTE_V_VALID)) {
+ spin_unlock_irqrestore(&ps3pf_bolttab_lock, flags);
+
+ /* ps3pf_hpte_insert() will be used to update PTE */
+ return -1;
+ }
+
+ result = lv1_write_htab_entry(0, slot, 0, 0);
+
+ if (result) {
+ DBG("%s: va=%lx slot=%lx psize=%d result = %ld (0x%lx)\n",
+ __func__, va, slot, psize, result, result);
+ BUG();
+ }
+
+ pteg = slot / HPTES_PER_GROUP;
+ bit = slot % HPTES_PER_GROUP;
+ inusetab[pteg] &= ~(0x80 >> bit);
+
+ spin_unlock_irqrestore(&ps3pf_bolttab_lock, flags);
+
+ /* ps3pf_hpte_insert() will be used to update PTE */
+ return -1;
+}
+
+static void ps3pf_hpte_updateboltedpp(unsigned long newpp, unsigned long ea,
+ int psize)
+{
+ panic("ps3pf_hpte_updateboltedpp() not implemented");
+}
+
+static void ps3pf_hpte_invalidate(unsigned long slot, unsigned long va,
+ int psize, int local)
+{
+ unsigned long flags;
+ unsigned long result;
+ unsigned long pteg, bit;
+
+ spin_lock_irqsave(&ps3pf_bolttab_lock, flags);
+ result = lv1_write_htab_entry(0, slot, 0, 0);
+
+ if (result) {
+ DBG("%s: va=%lx slot=%lx psize=%d result = %ld (0x%lx)\n",
+ __func__, va, slot, psize, result, result);
+ BUG();
+ }
+
+ pteg = slot / HPTES_PER_GROUP;
+ bit = slot % HPTES_PER_GROUP;
+ inusetab[pteg] &= ~(0x80 >> bit);
+ spin_unlock_irqrestore(&ps3pf_bolttab_lock, flags);
+}
+
+static void ps3pf_hpte_clear(void)
+{
+ lv1_unmap_htab(htab_addr);
+}
+
+void __init ps3pf_hpte_init(unsigned long htab_size)
+{
+ long bitmap_size;
+
+ DBG(" -> %s:%d\n", __func__, __LINE__);
+
+ ppc_md.hpte_invalidate = ps3pf_hpte_invalidate;
+ ppc_md.hpte_updatepp = ps3pf_hpte_updatepp;
+ ppc_md.hpte_updateboltedpp = ps3pf_hpte_updateboltedpp;
+ ppc_md.hpte_insert = ps3pf_hpte_insert;
+ ppc_md.hpte_remove = ps3pf_hpte_remove;
+ ppc_md.hpte_clear_all = ps3pf_hpte_clear;
+
+ ppc64_pft_size = __ilog2(htab_size);
+
+ bitmap_size = htab_size / sizeof(hpte_t) / 8;
+
+ bolttab = __va(lmb_alloc(bitmap_size, 1));
+ inusetab = __va(lmb_alloc(bitmap_size, 1));
+
+ memset(bolttab, 0, bitmap_size);
+ memset(inusetab, 0, bitmap_size);
+
+ DBG(" <- %s:%d\n", __func__, __LINE__);
+}
+
+void __init ps3pf_map_htab(void)
+{
+ long result;
+ unsigned long htab_size = (1UL << ppc64_pft_size);
+
+ result = lv1_map_htab(0, &htab_addr);
+
+ htab = (hpte_t *)__ioremap(htab_addr, htab_size, PAGE_READONLY_X);
+
+ DBG("%s:%d: lpar %016lxh, virt %016lxh\n", __func__, __LINE__,
+ htab_addr, (unsigned long)htab);
+}
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