[POWERPC] ps3: add htab routines

Adds pagetable management routines for the PS3.

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

diff --git a/arch/powerpc/platforms/ps3/htab.c b/arch/powerpc/platforms/ps3/htab.c
new file mode 100644 (file)
index 0000000..8fe1769
--- /dev/null
+++ b/arch/powerpc/platforms/ps3/htab.c
@@ -0,0 +1,277 @@
+/*
+ *  PS3 pagetable management routines.
+ *
+ *  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/ps3.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 ps3_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,
+               ps3_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 ps3_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(ps3_mm_phys_to_lpar(pa), psize) | rflags;
+
+       p_pteg = hpte_group / HPTES_PER_GROUP;
+       s_pteg = ~p_pteg & htab_hash_mask;
+
+       spin_lock_irqsave(&ps3_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(&ps3_bolttab_lock, flags);
+
+       return (slot & 7) | (secondary << 3);
+}
+
+static long ps3_hpte_remove(unsigned long hpte_group)
+{
+       panic("ps3_hpte_remove() not implemented");
+       return 0;
+}
+
+static long ps3_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(&ps3_bolttab_lock, flags);
+
+       hpte_v = htab[slot].v;
+       if (!HPTE_V_COMPARE(hpte_v, want_v) || !(hpte_v & HPTE_V_VALID)) {
+               spin_unlock_irqrestore(&ps3_bolttab_lock, flags);
+
+               /* ps3_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(&ps3_bolttab_lock, flags);
+
+       /* ps3_hpte_insert() will be used to update PTE */
+       return -1;
+}
+
+static void ps3_hpte_updateboltedpp(unsigned long newpp, unsigned long ea,
+       int psize)
+{
+       panic("ps3_hpte_updateboltedpp() not implemented");
+}
+
+static void ps3_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(&ps3_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(&ps3_bolttab_lock, flags);
+}
+
+static void ps3_hpte_clear(void)
+{
+       lv1_unmap_htab(htab_addr);
+}
+
+void __init ps3_hpte_init(unsigned long htab_size)
+{
+       long bitmap_size;
+
+       DBG(" -> %s:%d\n", __func__, __LINE__);
+
+       ppc_md.hpte_invalidate = ps3_hpte_invalidate;
+       ppc_md.hpte_updatepp = ps3_hpte_updatepp;
+       ppc_md.hpte_updateboltedpp = ps3_hpte_updateboltedpp;
+       ppc_md.hpte_insert = ps3_hpte_insert;
+       ppc_md.hpte_remove = ps3_hpte_remove;
+       ppc_md.hpte_clear_all = ps3_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 ps3_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);
+}