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authorStephen Rothwell <sfr@canb.auug.org.au>2005-09-27 12:28:45 -0400
committerStephen Rothwell <sfr@canb.auug.org.au>2005-09-27 12:28:45 -0400
commite508f438e0c152dcd1fbec5104e9c0ee28f352d4 (patch)
treebf67e0848e8ec5c5c255a8223550e9970cbdc29d /arch/ppc64/kernel/iSeries_htab.c
parentcb5c7980ab16c461a883ec7899675be57798d285 (diff)
powerpc: Move iSeries_htab.c to powerpc/platforms/iseries
And rename it to htab.c Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Diffstat (limited to 'arch/ppc64/kernel/iSeries_htab.c')
-rw-r--r--arch/ppc64/kernel/iSeries_htab.c255
1 files changed, 0 insertions, 255 deletions
diff --git a/arch/ppc64/kernel/iSeries_htab.c b/arch/ppc64/kernel/iSeries_htab.c
deleted file mode 100644
index 9a2be3abf349..000000000000
--- a/arch/ppc64/kernel/iSeries_htab.c
+++ /dev/null
@@ -1,255 +0,0 @@
1/*
2 * iSeries hashtable management.
3 * Derived from pSeries_htab.c
4 *
5 * SMP scalability work:
6 * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
7 *
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.
12 */
13#include <asm/machdep.h>
14#include <asm/pgtable.h>
15#include <asm/mmu.h>
16#include <asm/mmu_context.h>
17#include <asm/iSeries/HvCallHpt.h>
18#include <asm/abs_addr.h>
19#include <linux/spinlock.h>
20
21static spinlock_t iSeries_hlocks[64] __cacheline_aligned_in_smp = { [0 ... 63] = SPIN_LOCK_UNLOCKED};
22
23/*
24 * Very primitive algorithm for picking up a lock
25 */
26static inline void iSeries_hlock(unsigned long slot)
27{
28 if (slot & 0x8)
29 slot = ~slot;
30 spin_lock(&iSeries_hlocks[(slot >> 4) & 0x3f]);
31}
32
33static inline void iSeries_hunlock(unsigned long slot)
34{
35 if (slot & 0x8)
36 slot = ~slot;
37 spin_unlock(&iSeries_hlocks[(slot >> 4) & 0x3f]);
38}
39
40static long iSeries_hpte_insert(unsigned long hpte_group, unsigned long va,
41 unsigned long prpn, unsigned long vflags,
42 unsigned long rflags)
43{
44 unsigned long arpn;
45 long slot;
46 hpte_t lhpte;
47 int secondary = 0;
48
49 /*
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.
54 */
55 if (vflags & HPTE_V_SECONDARY)
56 return -1;
57
58 iSeries_hlock(hpte_group);
59
60 slot = HvCallHpt_findValid(&lhpte, va >> PAGE_SHIFT);
61 BUG_ON(lhpte.v & HPTE_V_VALID);
62
63 if (slot == -1) { /* No available entry found in either group */
64 iSeries_hunlock(hpte_group);
65 return -1;
66 }
67
68 if (slot < 0) { /* MSB set means secondary group */
69 vflags |= HPTE_V_VALID;
70 secondary = 1;
71 slot &= 0x7fffffffffffffff;
72 }
73
74 arpn = phys_to_abs(prpn << PAGE_SHIFT) >> PAGE_SHIFT;
75
76 lhpte.v = (va >> 23) << HPTE_V_AVPN_SHIFT | vflags | HPTE_V_VALID;
77 lhpte.r = (arpn << HPTE_R_RPN_SHIFT) | rflags;
78
79 /* Now fill in the actual HPTE */
80 HvCallHpt_addValidate(slot, secondary, &lhpte);
81
82 iSeries_hunlock(hpte_group);
83
84 return (secondary << 3) | (slot & 7);
85}
86
87long iSeries_hpte_bolt_or_insert(unsigned long hpte_group,
88 unsigned long va, unsigned long prpn, unsigned long vflags,
89 unsigned long rflags)
90{
91 long slot;
92 hpte_t lhpte;
93
94 slot = HvCallHpt_findValid(&lhpte, va >> PAGE_SHIFT);
95
96 if (lhpte.v & HPTE_V_VALID) {
97 /* Bolt the existing HPTE */
98 HvCallHpt_setSwBits(slot, 0x10, 0);
99 HvCallHpt_setPp(slot, PP_RWXX);
100 return 0;
101 }
102
103 return iSeries_hpte_insert(hpte_group, va, prpn, vflags, rflags);
104}
105
106static unsigned long iSeries_hpte_getword0(unsigned long slot)
107{
108 hpte_t hpte;
109
110 HvCallHpt_get(&hpte, slot);
111 return hpte.v;
112}
113
114static long iSeries_hpte_remove(unsigned long hpte_group)
115{
116 unsigned long slot_offset;
117 int i;
118 unsigned long hpte_v;
119
120 /* Pick a random slot to start at */
121 slot_offset = mftb() & 0x7;
122
123 iSeries_hlock(hpte_group);
124
125 for (i = 0; i < HPTES_PER_GROUP; i++) {
126 hpte_v = iSeries_hpte_getword0(hpte_group + slot_offset);
127
128 if (! (hpte_v & HPTE_V_BOLTED)) {
129 HvCallHpt_invalidateSetSwBitsGet(hpte_group +
130 slot_offset, 0, 0);
131 iSeries_hunlock(hpte_group);
132 return i;
133 }
134
135 slot_offset++;
136 slot_offset &= 0x7;
137 }
138
139 iSeries_hunlock(hpte_group);
140
141 return -1;
142}
143
144/*
145 * The HyperVisor expects the "flags" argument in this form:
146 * bits 0..59 : reserved
147 * bit 60 : N
148 * bits 61..63 : PP2,PP1,PP0
149 */
150static long iSeries_hpte_updatepp(unsigned long slot, unsigned long newpp,
151 unsigned long va, int large, int local)
152{
153 hpte_t hpte;
154 unsigned long avpn = va >> 23;
155
156 iSeries_hlock(slot);
157
158 HvCallHpt_get(&hpte, slot);
159 if ((HPTE_V_AVPN_VAL(hpte.v) == avpn) && (hpte.v & HPTE_V_VALID)) {
160 /*
161 * Hypervisor expects bits as NPPP, which is
162 * different from how they are mapped in our PP.
163 */
164 HvCallHpt_setPp(slot, (newpp & 0x3) | ((newpp & 0x4) << 1));
165 iSeries_hunlock(slot);
166 return 0;
167 }
168 iSeries_hunlock(slot);
169
170 return -1;
171}
172
173/*
174 * Functions used to find the PTE for a particular virtual address.
175 * Only used during boot when bolting pages.
176 *
177 * Input : vpn : virtual page number
178 * Output: PTE index within the page table of the entry
179 * -1 on failure
180 */
181static long iSeries_hpte_find(unsigned long vpn)
182{
183 hpte_t hpte;
184 long slot;
185
186 /*
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
191 */
192 slot = HvCallHpt_findValid(&hpte, vpn);
193 if (hpte.v & HPTE_V_VALID) {
194 if (slot < 0) {
195 slot &= 0x7fffffffffffffff;
196 slot = -slot;
197 }
198 } else
199 slot = -1;
200 return slot;
201}
202
203/*
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.
208 *
209 * No need to lock here because we should be the only user.
210 */
211static void iSeries_hpte_updateboltedpp(unsigned long newpp, unsigned long ea)
212{
213 unsigned long vsid,va,vpn;
214 long slot;
215
216 vsid = get_kernel_vsid(ea);
217 va = (vsid << 28) | (ea & 0x0fffffff);
218 vpn = va >> PAGE_SHIFT;
219 slot = iSeries_hpte_find(vpn);
220 if (slot == -1)
221 panic("updateboltedpp: Could not find page to bolt\n");
222 HvCallHpt_setPp(slot, newpp);
223}
224
225static void iSeries_hpte_invalidate(unsigned long slot, unsigned long va,
226 int large, int local)
227{
228 unsigned long hpte_v;
229 unsigned long avpn = va >> 23;
230 unsigned long flags;
231
232 local_irq_save(flags);
233
234 iSeries_hlock(slot);
235
236 hpte_v = iSeries_hpte_getword0(slot);
237
238 if ((HPTE_V_AVPN_VAL(hpte_v) == avpn) && (hpte_v & HPTE_V_VALID))
239 HvCallHpt_invalidateSetSwBitsGet(slot, 0, 0);
240
241 iSeries_hunlock(slot);
242
243 local_irq_restore(flags);
244}
245
246void hpte_init_iSeries(void)
247{
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;
253
254 htab_finish_init();
255}
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-30 01:41:18 -0500