[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>

1 files changed, 277 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/ps3/htab.c b/arch/powerpc/platforms/ps3/htab.c
new file mode 100644
index 000000000000..8fe1769655a3
--- /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);
+}