2 * iSeries hashtable management.
3 * Derived from pSeries_htab.c
5 * SMP scalability work:
6 * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
13 #include <asm/machdep.h>
14 #include <asm/pgtable.h>
16 #include <asm/mmu_context.h>
17 #include <asm/iSeries/HvCallHpt.h>
18 #include <asm/abs_addr.h>
19 #include <linux/spinlock.h>
21 static spinlock_t iSeries_hlocks[64] __cacheline_aligned_in_smp = { [0 ... 63] = SPIN_LOCK_UNLOCKED};
24 * Very primitive algorithm for picking up a lock
26 static inline void iSeries_hlock(unsigned long slot)
30 spin_lock(&iSeries_hlocks[(slot >> 4) & 0x3f]);
33 static inline void iSeries_hunlock(unsigned long slot)
37 spin_unlock(&iSeries_hlocks[(slot >> 4) & 0x3f]);
40 static long iSeries_hpte_insert(unsigned long hpte_group, unsigned long va,
41 unsigned long prpn, unsigned long vflags,
49 * The hypervisor tries both primary and secondary.
50 * If we are being called to insert in the secondary,
51 * it means we have already tried both primary and secondary,
52 * so we return failure immediately.
54 if (vflags & HPTE_V_SECONDARY)
57 iSeries_hlock(hpte_group);
59 slot = HvCallHpt_findValid(&lhpte, va >> PAGE_SHIFT);
60 BUG_ON(lhpte.v & HPTE_V_VALID);
62 if (slot == -1) { /* No available entry found in either group */
63 iSeries_hunlock(hpte_group);
67 if (slot < 0) { /* MSB set means secondary group */
68 vflags |= HPTE_V_VALID;
70 slot &= 0x7fffffffffffffff;
73 lhpte.v = (va >> 23) << HPTE_V_AVPN_SHIFT | vflags | HPTE_V_VALID;
74 lhpte.r = (physRpn_to_absRpn(prpn) << HPTE_R_RPN_SHIFT) | rflags;
76 /* Now fill in the actual HPTE */
77 HvCallHpt_addValidate(slot, secondary, &lhpte);
79 iSeries_hunlock(hpte_group);
81 return (secondary << 3) | (slot & 7);
84 static unsigned long iSeries_hpte_getword0(unsigned long slot)
88 HvCallHpt_get(&hpte, slot);
92 static long iSeries_hpte_remove(unsigned long hpte_group)
94 unsigned long slot_offset;
98 /* Pick a random slot to start at */
99 slot_offset = mftb() & 0x7;
101 iSeries_hlock(hpte_group);
103 for (i = 0; i < HPTES_PER_GROUP; i++) {
104 hpte_v = iSeries_hpte_getword0(hpte_group + slot_offset);
106 if (! (hpte_v & HPTE_V_BOLTED)) {
107 HvCallHpt_invalidateSetSwBitsGet(hpte_group +
109 iSeries_hunlock(hpte_group);
117 iSeries_hunlock(hpte_group);
123 * The HyperVisor expects the "flags" argument in this form:
124 * bits 0..59 : reserved
126 * bits 61..63 : PP2,PP1,PP0
128 static long iSeries_hpte_updatepp(unsigned long slot, unsigned long newpp,
129 unsigned long va, int large, int local)
132 unsigned long avpn = va >> 23;
136 HvCallHpt_get(&hpte, slot);
137 if ((HPTE_V_AVPN_VAL(hpte.v) == avpn) && (hpte.v & HPTE_V_VALID)) {
139 * Hypervisor expects bits as NPPP, which is
140 * different from how they are mapped in our PP.
142 HvCallHpt_setPp(slot, (newpp & 0x3) | ((newpp & 0x4) << 1));
143 iSeries_hunlock(slot);
146 iSeries_hunlock(slot);
152 * Functions used to find the PTE for a particular virtual address.
153 * Only used during boot when bolting pages.
155 * Input : vpn : virtual page number
156 * Output: PTE index within the page table of the entry
159 static long iSeries_hpte_find(unsigned long vpn)
165 * The HvCallHpt_findValid interface is as follows:
166 * 0xffffffffffffffff : No entry found.
167 * 0x00000000xxxxxxxx : Entry found in primary group, slot x
168 * 0x80000000xxxxxxxx : Entry found in secondary group, slot x
170 slot = HvCallHpt_findValid(&hpte, vpn);
171 if (hpte.v & HPTE_V_VALID) {
173 slot &= 0x7fffffffffffffff;
182 * Update the page protection bits. Intended to be used to create
183 * guard pages for kernel data structures on pages which are bolted
184 * in the HPT. Assumes pages being operated on will not be stolen.
185 * Does not work on large pages.
187 * No need to lock here because we should be the only user.
189 static void iSeries_hpte_updateboltedpp(unsigned long newpp, unsigned long ea)
191 unsigned long vsid,va,vpn;
194 vsid = get_kernel_vsid(ea);
195 va = (vsid << 28) | (ea & 0x0fffffff);
196 vpn = va >> PAGE_SHIFT;
197 slot = iSeries_hpte_find(vpn);
199 panic("updateboltedpp: Could not find page to bolt\n");
200 HvCallHpt_setPp(slot, newpp);
203 static void iSeries_hpte_invalidate(unsigned long slot, unsigned long va,
204 int large, int local)
206 unsigned long hpte_v;
207 unsigned long avpn = va >> 23;
210 local_irq_save(flags);
214 hpte_v = iSeries_hpte_getword0(slot);
216 if ((HPTE_V_AVPN_VAL(hpte_v) == avpn) && (hpte_v & HPTE_V_VALID))
217 HvCallHpt_invalidateSetSwBitsGet(slot, 0, 0);
219 iSeries_hunlock(slot);
221 local_irq_restore(flags);
224 void hpte_init_iSeries(void)
226 ppc_md.hpte_invalidate = iSeries_hpte_invalidate;
227 ppc_md.hpte_updatepp = iSeries_hpte_updatepp;
228 ppc_md.hpte_updateboltedpp = iSeries_hpte_updateboltedpp;
229 ppc_md.hpte_insert = iSeries_hpte_insert;
230 ppc_md.hpte_remove = iSeries_hpte_remove;