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 =
22 { [0 ... 63] = SPIN_LOCK_UNLOCKED};
25 * Very primitive algorithm for picking up a lock
27 static inline void iSeries_hlock(unsigned long slot)
31 spin_lock(&iSeries_hlocks[(slot >> 4) & 0x3f]);
34 static inline void iSeries_hunlock(unsigned long slot)
38 spin_unlock(&iSeries_hlocks[(slot >> 4) & 0x3f]);
41 static long iSeries_hpte_insert(unsigned long hpte_group, unsigned long va,
42 unsigned long prpn, unsigned long vflags,
51 * The hypervisor tries both primary and secondary.
52 * If we are being called to insert in the secondary,
53 * it means we have already tried both primary and secondary,
54 * so we return failure immediately.
56 if (vflags & HPTE_V_SECONDARY)
59 iSeries_hlock(hpte_group);
61 slot = HvCallHpt_findValid(&lhpte, va >> PAGE_SHIFT);
62 BUG_ON(lhpte.v & HPTE_V_VALID);
64 if (slot == -1) { /* No available entry found in either group */
65 iSeries_hunlock(hpte_group);
69 if (slot < 0) { /* MSB set means secondary group */
70 vflags |= HPTE_V_VALID;
72 slot &= 0x7fffffffffffffff;
75 arpn = phys_to_abs(prpn << PAGE_SHIFT) >> PAGE_SHIFT;
77 lhpte.v = (va >> 23) << HPTE_V_AVPN_SHIFT | vflags | HPTE_V_VALID;
78 lhpte.r = (arpn << HPTE_R_RPN_SHIFT) | rflags;
80 /* Now fill in the actual HPTE */
81 HvCallHpt_addValidate(slot, secondary, &lhpte);
83 iSeries_hunlock(hpte_group);
85 return (secondary << 3) | (slot & 7);
88 long iSeries_hpte_bolt_or_insert(unsigned long hpte_group,
89 unsigned long va, unsigned long prpn, unsigned long vflags,
95 slot = HvCallHpt_findValid(&lhpte, va >> PAGE_SHIFT);
97 if (lhpte.v & HPTE_V_VALID) {
98 /* Bolt the existing HPTE */
99 HvCallHpt_setSwBits(slot, 0x10, 0);
100 HvCallHpt_setPp(slot, PP_RWXX);
104 return iSeries_hpte_insert(hpte_group, va, prpn, vflags, rflags);
107 static unsigned long iSeries_hpte_getword0(unsigned long slot)
111 HvCallHpt_get(&hpte, slot);
115 static long iSeries_hpte_remove(unsigned long hpte_group)
117 unsigned long slot_offset;
119 unsigned long hpte_v;
121 /* Pick a random slot to start at */
122 slot_offset = mftb() & 0x7;
124 iSeries_hlock(hpte_group);
126 for (i = 0; i < HPTES_PER_GROUP; i++) {
127 hpte_v = iSeries_hpte_getword0(hpte_group + slot_offset);
129 if (! (hpte_v & HPTE_V_BOLTED)) {
130 HvCallHpt_invalidateSetSwBitsGet(hpte_group +
132 iSeries_hunlock(hpte_group);
140 iSeries_hunlock(hpte_group);
146 * The HyperVisor expects the "flags" argument in this form:
147 * bits 0..59 : reserved
149 * bits 61..63 : PP2,PP1,PP0
151 static long iSeries_hpte_updatepp(unsigned long slot, unsigned long newpp,
152 unsigned long va, int large, int local)
155 unsigned long avpn = va >> 23;
159 HvCallHpt_get(&hpte, slot);
160 if ((HPTE_V_AVPN_VAL(hpte.v) == avpn) && (hpte.v & HPTE_V_VALID)) {
162 * Hypervisor expects bits as NPPP, which is
163 * different from how they are mapped in our PP.
165 HvCallHpt_setPp(slot, (newpp & 0x3) | ((newpp & 0x4) << 1));
166 iSeries_hunlock(slot);
169 iSeries_hunlock(slot);
175 * Functions used to find the PTE for a particular virtual address.
176 * Only used during boot when bolting pages.
178 * Input : vpn : virtual page number
179 * Output: PTE index within the page table of the entry
182 static long iSeries_hpte_find(unsigned long vpn)
188 * The HvCallHpt_findValid interface is as follows:
189 * 0xffffffffffffffff : No entry found.
190 * 0x00000000xxxxxxxx : Entry found in primary group, slot x
191 * 0x80000000xxxxxxxx : Entry found in secondary group, slot x
193 slot = HvCallHpt_findValid(&hpte, vpn);
194 if (hpte.v & HPTE_V_VALID) {
196 slot &= 0x7fffffffffffffff;
205 * Update the page protection bits. Intended to be used to create
206 * guard pages for kernel data structures on pages which are bolted
207 * in the HPT. Assumes pages being operated on will not be stolen.
208 * Does not work on large pages.
210 * No need to lock here because we should be the only user.
212 static void iSeries_hpte_updateboltedpp(unsigned long newpp, unsigned long ea)
214 unsigned long vsid,va,vpn;
217 vsid = get_kernel_vsid(ea);
218 va = (vsid << 28) | (ea & 0x0fffffff);
219 vpn = va >> PAGE_SHIFT;
220 slot = iSeries_hpte_find(vpn);
222 panic("updateboltedpp: Could not find page to bolt\n");
223 HvCallHpt_setPp(slot, newpp);
226 static void iSeries_hpte_invalidate(unsigned long slot, unsigned long va,
227 int large, int local)
229 unsigned long hpte_v;
230 unsigned long avpn = va >> 23;
233 local_irq_save(flags);
237 hpte_v = iSeries_hpte_getword0(slot);
239 if ((HPTE_V_AVPN_VAL(hpte_v) == avpn) && (hpte_v & HPTE_V_VALID))
240 HvCallHpt_invalidateSetSwBitsGet(slot, 0, 0);
242 iSeries_hunlock(slot);
244 local_irq_restore(flags);
247 void hpte_init_iSeries(void)
249 ppc_md.hpte_invalidate = iSeries_hpte_invalidate;
250 ppc_md.hpte_updatepp = iSeries_hpte_updatepp;
251 ppc_md.hpte_updateboltedpp = iSeries_hpte_updateboltedpp;
252 ppc_md.hpte_insert = iSeries_hpte_insert;
253 ppc_md.hpte_remove = iSeries_hpte_remove;