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,
50 * The hypervisor tries both primary and secondary.
51 * If we are being called to insert in the secondary,
52 * it means we have already tried both primary and secondary,
53 * so we return failure immediately.
55 if (vflags & HPTE_V_SECONDARY)
58 iSeries_hlock(hpte_group);
60 slot = HvCallHpt_findValid(&lhpte, va >> PAGE_SHIFT);
61 BUG_ON(lhpte.v & HPTE_V_VALID);
63 if (slot == -1) { /* No available entry found in either group */
64 iSeries_hunlock(hpte_group);
68 if (slot < 0) { /* MSB set means secondary group */
69 vflags |= HPTE_V_VALID;
71 slot &= 0x7fffffffffffffff;
74 arpn = phys_to_abs(prpn << PAGE_SHIFT) >> PAGE_SHIFT;
76 lhpte.v = (va >> 23) << HPTE_V_AVPN_SHIFT | vflags | HPTE_V_VALID;
77 lhpte.r = (arpn << HPTE_R_RPN_SHIFT) | rflags;
79 /* Now fill in the actual HPTE */
80 HvCallHpt_addValidate(slot, secondary, &lhpte);
82 iSeries_hunlock(hpte_group);
84 return (secondary << 3) | (slot & 7);
87 long iSeries_hpte_bolt_or_insert(unsigned long hpte_group,
88 unsigned long va, unsigned long prpn, unsigned long vflags,
94 slot = HvCallHpt_findValid(&lhpte, va >> PAGE_SHIFT);
96 if (lhpte.v & HPTE_V_VALID) {
97 /* Bolt the existing HPTE */
98 HvCallHpt_setSwBits(slot, 0x10, 0);
99 HvCallHpt_setPp(slot, PP_RWXX);
103 return iSeries_hpte_insert(hpte_group, va, prpn, vflags, rflags);
106 static unsigned long iSeries_hpte_getword0(unsigned long slot)
110 HvCallHpt_get(&hpte, slot);
114 static long iSeries_hpte_remove(unsigned long hpte_group)
116 unsigned long slot_offset;
118 unsigned long hpte_v;
120 /* Pick a random slot to start at */
121 slot_offset = mftb() & 0x7;
123 iSeries_hlock(hpte_group);
125 for (i = 0; i < HPTES_PER_GROUP; i++) {
126 hpte_v = iSeries_hpte_getword0(hpte_group + slot_offset);
128 if (! (hpte_v & HPTE_V_BOLTED)) {
129 HvCallHpt_invalidateSetSwBitsGet(hpte_group +
131 iSeries_hunlock(hpte_group);
139 iSeries_hunlock(hpte_group);
145 * The HyperVisor expects the "flags" argument in this form:
146 * bits 0..59 : reserved
148 * bits 61..63 : PP2,PP1,PP0
150 static long iSeries_hpte_updatepp(unsigned long slot, unsigned long newpp,
151 unsigned long va, int large, int local)
154 unsigned long avpn = va >> 23;
158 HvCallHpt_get(&hpte, slot);
159 if ((HPTE_V_AVPN_VAL(hpte.v) == avpn) && (hpte.v & HPTE_V_VALID)) {
161 * Hypervisor expects bits as NPPP, which is
162 * different from how they are mapped in our PP.
164 HvCallHpt_setPp(slot, (newpp & 0x3) | ((newpp & 0x4) << 1));
165 iSeries_hunlock(slot);
168 iSeries_hunlock(slot);
174 * Functions used to find the PTE for a particular virtual address.
175 * Only used during boot when bolting pages.
177 * Input : vpn : virtual page number
178 * Output: PTE index within the page table of the entry
181 static long iSeries_hpte_find(unsigned long vpn)
187 * The HvCallHpt_findValid interface is as follows:
188 * 0xffffffffffffffff : No entry found.
189 * 0x00000000xxxxxxxx : Entry found in primary group, slot x
190 * 0x80000000xxxxxxxx : Entry found in secondary group, slot x
192 slot = HvCallHpt_findValid(&hpte, vpn);
193 if (hpte.v & HPTE_V_VALID) {
195 slot &= 0x7fffffffffffffff;
204 * Update the page protection bits. Intended to be used to create
205 * guard pages for kernel data structures on pages which are bolted
206 * in the HPT. Assumes pages being operated on will not be stolen.
207 * Does not work on large pages.
209 * No need to lock here because we should be the only user.
211 static void iSeries_hpte_updateboltedpp(unsigned long newpp, unsigned long ea)
213 unsigned long vsid,va,vpn;
216 vsid = get_kernel_vsid(ea);
217 va = (vsid << 28) | (ea & 0x0fffffff);
218 vpn = va >> PAGE_SHIFT;
219 slot = iSeries_hpte_find(vpn);
221 panic("updateboltedpp: Could not find page to bolt\n");
222 HvCallHpt_setPp(slot, newpp);
225 static void iSeries_hpte_invalidate(unsigned long slot, unsigned long va,
226 int large, int local)
228 unsigned long hpte_v;
229 unsigned long avpn = va >> 23;
232 local_irq_save(flags);
236 hpte_v = iSeries_hpte_getword0(slot);
238 if ((HPTE_V_AVPN_VAL(hpte_v) == avpn) && (hpte_v & HPTE_V_VALID))
239 HvCallHpt_invalidateSetSwBitsGet(slot, 0, 0);
241 iSeries_hunlock(slot);
243 local_irq_restore(flags);
246 void hpte_init_iSeries(void)
248 ppc_md.hpte_invalidate = iSeries_hpte_invalidate;
249 ppc_md.hpte_updatepp = iSeries_hpte_updatepp;
250 ppc_md.hpte_updateboltedpp = iSeries_hpte_updateboltedpp;
251 ppc_md.hpte_insert = iSeries_hpte_insert;
252 ppc_md.hpte_remove = iSeries_hpte_remove;