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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * SN2 Platform specific SMP Support
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
Jack Steiner61a34a02006-01-26 15:03:41 -08008 * Copyright (C) 2000-2006 Silicon Graphics, Inc. All rights reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 */
10
11#include <linux/init.h>
12#include <linux/kernel.h>
13#include <linux/spinlock.h>
14#include <linux/threads.h>
15#include <linux/sched.h>
16#include <linux/smp.h>
17#include <linux/interrupt.h>
18#include <linux/irq.h>
19#include <linux/mmzone.h>
20#include <linux/module.h>
21#include <linux/bitops.h>
22#include <linux/nodemask.h>
Jack Steiner470ceb02005-08-11 10:28:00 -070023#include <linux/proc_fs.h>
24#include <linux/seq_file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
26#include <asm/processor.h>
27#include <asm/irq.h>
28#include <asm/sal.h>
29#include <asm/system.h>
30#include <asm/delay.h>
31#include <asm/io.h>
32#include <asm/smp.h>
33#include <asm/tlb.h>
34#include <asm/numa.h>
35#include <asm/hw_irq.h>
36#include <asm/current.h>
37#include <asm/sn/sn_cpuid.h>
38#include <asm/sn/sn_sal.h>
39#include <asm/sn/addrs.h>
40#include <asm/sn/shub_mmr.h>
41#include <asm/sn/nodepda.h>
42#include <asm/sn/rw_mmr.h>
John Keller6e9de182007-08-22 19:32:06 -050043#include <asm/sn/sn_feature_sets.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
Jack Steiner470ceb02005-08-11 10:28:00 -070045DEFINE_PER_CPU(struct ptc_stats, ptcstats);
46DECLARE_PER_CPU(struct ptc_stats, ptcstats);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48static __cacheline_aligned DEFINE_SPINLOCK(sn2_global_ptc_lock);
49
Jack Steiner3be44b92007-05-08 14:50:43 -070050/* 0 = old algorithm (no IPI flushes), 1 = ipi deadlock flush, 2 = ipi instead of SHUB ptc, >2 = always ipi */
51static int sn2_flush_opt = 0;
52
Jes Sorensen8ed9b2c2006-02-13 05:29:57 -050053extern unsigned long
54sn2_ptc_deadlock_recovery_core(volatile unsigned long *, unsigned long,
55 volatile unsigned long *, unsigned long,
56 volatile unsigned long *, unsigned long);
57void
58sn2_ptc_deadlock_recovery(short *, short, short, int,
59 volatile unsigned long *, unsigned long,
60 volatile unsigned long *, unsigned long);
Jack Steiner470ceb02005-08-11 10:28:00 -070061
Jack Steiner470ceb02005-08-11 10:28:00 -070062/*
Jack Steiner61a34a02006-01-26 15:03:41 -080063 * Note: some is the following is captured here to make degugging easier
64 * (the macros make more sense if you see the debug patch - not posted)
Jack Steiner470ceb02005-08-11 10:28:00 -070065 */
Jack Steiner470ceb02005-08-11 10:28:00 -070066#define sn2_ptctest 0
Jack Steiner61a34a02006-01-26 15:03:41 -080067#define local_node_uses_ptc_ga(sh1) ((sh1) ? 1 : 0)
68#define max_active_pio(sh1) ((sh1) ? 32 : 7)
69#define reset_max_active_on_deadlock() 1
70#define PTC_LOCK(sh1) ((sh1) ? &sn2_global_ptc_lock : &sn_nodepda->ptc_lock)
Jack Steiner470ceb02005-08-11 10:28:00 -070071
Jack Steiner470ceb02005-08-11 10:28:00 -070072struct ptc_stats {
73 unsigned long ptc_l;
74 unsigned long change_rid;
75 unsigned long shub_ptc_flushes;
76 unsigned long nodes_flushed;
77 unsigned long deadlocks;
Jack Steiner61a34a02006-01-26 15:03:41 -080078 unsigned long deadlocks2;
Jack Steiner470ceb02005-08-11 10:28:00 -070079 unsigned long lock_itc_clocks;
80 unsigned long shub_itc_clocks;
81 unsigned long shub_itc_clocks_max;
Jack Steiner61a34a02006-01-26 15:03:41 -080082 unsigned long shub_ptc_flushes_not_my_mm;
Jack Steiner3be44b92007-05-08 14:50:43 -070083 unsigned long shub_ipi_flushes;
84 unsigned long shub_ipi_flushes_itc_clocks;
Jack Steiner470ceb02005-08-11 10:28:00 -070085};
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
Jes Sorensen8ed9b2c2006-02-13 05:29:57 -050087#define sn2_ptctest 0
88
Linus Torvalds1da177e2005-04-16 15:20:36 -070089static inline unsigned long wait_piowc(void)
90{
Jack Steiner61a34a02006-01-26 15:03:41 -080091 volatile unsigned long *piows;
92 unsigned long zeroval, ws;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
94 piows = pda->pio_write_status_addr;
95 zeroval = pda->pio_write_status_val;
96 do {
97 cpu_relax();
98 } while (((ws = *piows) & SH_PIO_WRITE_STATUS_PENDING_WRITE_COUNT_MASK) != zeroval);
Jack Steiner61a34a02006-01-26 15:03:41 -080099 return (ws & SH_PIO_WRITE_STATUS_WRITE_DEADLOCK_MASK) != 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100}
101
Brent Casavante08e6c52006-01-26 15:55:52 -0800102/**
103 * sn_migrate - SN-specific task migration actions
104 * @task: Task being migrated to new CPU
105 *
106 * SN2 PIO writes from separate CPUs are not guaranteed to arrive in order.
107 * Context switching user threads which have memory-mapped MMIO may cause
Simon Arlott72fdbdc2007-05-11 14:55:43 -0700108 * PIOs to issue from separate CPUs, thus the PIO writes must be drained
Brent Casavante08e6c52006-01-26 15:55:52 -0800109 * from the previous CPU's Shub before execution resumes on the new CPU.
110 */
111void sn_migrate(struct task_struct *task)
112{
113 pda_t *last_pda = pdacpu(task_thread_info(task)->last_cpu);
114 volatile unsigned long *adr = last_pda->pio_write_status_addr;
115 unsigned long val = last_pda->pio_write_status_val;
116
117 /* Drain PIO writes from old CPU's Shub */
118 while (unlikely((*adr & SH_PIO_WRITE_STATUS_PENDING_WRITE_COUNT_MASK)
119 != val))
120 cpu_relax();
121}
122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123void sn_tlb_migrate_finish(struct mm_struct *mm)
124{
Jack Steiner61a34a02006-01-26 15:03:41 -0800125 /* flush_tlb_mm is inefficient if more than 1 users of mm */
126 if (mm == current->mm && mm && atomic_read(&mm->mm_users) == 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 flush_tlb_mm(mm);
128}
129
Jack Steiner3be44b92007-05-08 14:50:43 -0700130static void
131sn2_ipi_flush_all_tlb(struct mm_struct *mm)
132{
133 unsigned long itc;
134
135 itc = ia64_get_itc();
136 smp_flush_tlb_cpumask(mm->cpu_vm_mask);
137 itc = ia64_get_itc() - itc;
138 __get_cpu_var(ptcstats).shub_ipi_flushes_itc_clocks += itc;
139 __get_cpu_var(ptcstats).shub_ipi_flushes++;
140}
141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142/**
143 * sn2_global_tlb_purge - globally purge translation cache of virtual address range
Dean Roec1902aa2005-10-27 15:41:04 -0500144 * @mm: mm_struct containing virtual address range
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 * @start: start of virtual address range
146 * @end: end of virtual address range
147 * @nbits: specifies number of bytes to purge per instruction (num = 1<<(nbits & 0xfc))
148 *
149 * Purges the translation caches of all processors of the given virtual address
150 * range.
151 *
152 * Note:
153 * - cpu_vm_mask is a bit mask that indicates which cpus have loaded the context.
154 * - cpu_vm_mask is converted into a nodemask of the nodes containing the
155 * cpus in cpu_vm_mask.
Dean Roec1902aa2005-10-27 15:41:04 -0500156 * - if only one bit is set in cpu_vm_mask & it is the current cpu & the
157 * process is purging its own virtual address range, then only the
158 * local TLB needs to be flushed. This flushing can be done using
159 * ptc.l. This is the common case & avoids the global spinlock.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 * - if multiple cpus have loaded the context, then flushing has to be
161 * done with ptc.g/MMRs under protection of the global ptc_lock.
162 */
163
164void
Dean Roec1902aa2005-10-27 15:41:04 -0500165sn2_global_tlb_purge(struct mm_struct *mm, unsigned long start,
166 unsigned long end, unsigned long nbits)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167{
Jack Steiner61a34a02006-01-26 15:03:41 -0800168 int i, ibegin, shub1, cnode, mynasid, cpu, lcpu = 0, nasid;
169 int mymm = (mm == current->active_mm && mm == current->mm);
170 int use_cpu_ptcga;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 volatile unsigned long *ptc0, *ptc1;
Jack Steiner61a34a02006-01-26 15:03:41 -0800172 unsigned long itc, itc2, flags, data0 = 0, data1 = 0, rr_value, old_rr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 short nasids[MAX_NUMNODES], nix;
174 nodemask_t nodes_flushed;
Jack Steiner3be44b92007-05-08 14:50:43 -0700175 int active, max_active, deadlock, flush_opt = sn2_flush_opt;
176
177 if (flush_opt > 2) {
178 sn2_ipi_flush_all_tlb(mm);
179 return;
180 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
182 nodes_clear(nodes_flushed);
183 i = 0;
184
185 for_each_cpu_mask(cpu, mm->cpu_vm_mask) {
186 cnode = cpu_to_node(cpu);
187 node_set(cnode, nodes_flushed);
188 lcpu = cpu;
189 i++;
190 }
191
Dean Roec1902aa2005-10-27 15:41:04 -0500192 if (i == 0)
193 return;
194
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 preempt_disable();
196
Dean Roec1902aa2005-10-27 15:41:04 -0500197 if (likely(i == 1 && lcpu == smp_processor_id() && mymm)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 do {
199 ia64_ptcl(start, nbits << 2);
200 start += (1UL << nbits);
201 } while (start < end);
202 ia64_srlz_i();
Jack Steiner470ceb02005-08-11 10:28:00 -0700203 __get_cpu_var(ptcstats).ptc_l++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 preempt_enable();
205 return;
206 }
207
Dean Roec1902aa2005-10-27 15:41:04 -0500208 if (atomic_read(&mm->mm_users) == 1 && mymm) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 flush_tlb_mm(mm);
Jack Steiner470ceb02005-08-11 10:28:00 -0700210 __get_cpu_var(ptcstats).change_rid++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 preempt_enable();
212 return;
213 }
214
Jack Steiner3be44b92007-05-08 14:50:43 -0700215 if (flush_opt == 2) {
216 sn2_ipi_flush_all_tlb(mm);
217 preempt_enable();
218 return;
219 }
220
Jack Steiner470ceb02005-08-11 10:28:00 -0700221 itc = ia64_get_itc();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 nix = 0;
223 for_each_node_mask(cnode, nodes_flushed)
224 nasids[nix++] = cnodeid_to_nasid(cnode);
225
Dean Roec1902aa2005-10-27 15:41:04 -0500226 rr_value = (mm->context << 3) | REGION_NUMBER(start);
227
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 shub1 = is_shub1();
229 if (shub1) {
230 data0 = (1UL << SH1_PTC_0_A_SHFT) |
231 (nbits << SH1_PTC_0_PS_SHFT) |
Dean Roec1902aa2005-10-27 15:41:04 -0500232 (rr_value << SH1_PTC_0_RID_SHFT) |
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 (1UL << SH1_PTC_0_START_SHFT);
234 ptc0 = (long *)GLOBAL_MMR_PHYS_ADDR(0, SH1_PTC_0);
235 ptc1 = (long *)GLOBAL_MMR_PHYS_ADDR(0, SH1_PTC_1);
236 } else {
237 data0 = (1UL << SH2_PTC_A_SHFT) |
238 (nbits << SH2_PTC_PS_SHFT) |
239 (1UL << SH2_PTC_START_SHFT);
240 ptc0 = (long *)GLOBAL_MMR_PHYS_ADDR(0, SH2_PTC +
Dean Roec1902aa2005-10-27 15:41:04 -0500241 (rr_value << SH2_PTC_RID_SHFT));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 ptc1 = NULL;
243 }
244
245
246 mynasid = get_nasid();
Jack Steiner61a34a02006-01-26 15:03:41 -0800247 use_cpu_ptcga = local_node_uses_ptc_ga(shub1);
248 max_active = max_active_pio(shub1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
Jack Steiner470ceb02005-08-11 10:28:00 -0700250 itc = ia64_get_itc();
Jes Sorensen8ed9b2c2006-02-13 05:29:57 -0500251 spin_lock_irqsave(PTC_LOCK(shub1), flags);
Jack Steiner470ceb02005-08-11 10:28:00 -0700252 itc2 = ia64_get_itc();
Jack Steiner61a34a02006-01-26 15:03:41 -0800253
Jack Steiner470ceb02005-08-11 10:28:00 -0700254 __get_cpu_var(ptcstats).lock_itc_clocks += itc2 - itc;
255 __get_cpu_var(ptcstats).shub_ptc_flushes++;
256 __get_cpu_var(ptcstats).nodes_flushed += nix;
Jack Steiner61a34a02006-01-26 15:03:41 -0800257 if (!mymm)
258 __get_cpu_var(ptcstats).shub_ptc_flushes_not_my_mm++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Jack Steiner61a34a02006-01-26 15:03:41 -0800260 if (use_cpu_ptcga && !mymm) {
261 old_rr = ia64_get_rr(start);
262 ia64_set_rr(start, (old_rr & 0xff) | (rr_value << 8));
263 ia64_srlz_d();
264 }
265
266 wait_piowc();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 do {
268 if (shub1)
269 data1 = start | (1UL << SH1_PTC_1_START_SHFT);
270 else
271 data0 = (data0 & ~SH2_PTC_ADDR_MASK) | (start & SH2_PTC_ADDR_MASK);
Jack Steiner61a34a02006-01-26 15:03:41 -0800272 deadlock = 0;
273 active = 0;
274 for (ibegin = 0, i = 0; i < nix; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 nasid = nasids[i];
Jack Steiner61a34a02006-01-26 15:03:41 -0800276 if (use_cpu_ptcga && unlikely(nasid == mynasid)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 ia64_ptcga(start, nbits << 2);
278 ia64_srlz_i();
279 } else {
280 ptc0 = CHANGE_NASID(nasid, ptc0);
281 if (ptc1)
282 ptc1 = CHANGE_NASID(nasid, ptc1);
Jack Steiner61a34a02006-01-26 15:03:41 -0800283 pio_atomic_phys_write_mmrs(ptc0, data0, ptc1, data1);
284 active++;
285 }
286 if (active >= max_active || i == (nix - 1)) {
287 if ((deadlock = wait_piowc())) {
Jack Steiner3be44b92007-05-08 14:50:43 -0700288 if (flush_opt == 1)
289 goto done;
Jack Steiner61a34a02006-01-26 15:03:41 -0800290 sn2_ptc_deadlock_recovery(nasids, ibegin, i, mynasid, ptc0, data0, ptc1, data1);
291 if (reset_max_active_on_deadlock())
292 max_active = 1;
293 }
294 active = 0;
295 ibegin = i + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 }
297 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 start += (1UL << nbits);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 } while (start < end);
300
Jack Steiner3be44b92007-05-08 14:50:43 -0700301done:
Jack Steiner470ceb02005-08-11 10:28:00 -0700302 itc2 = ia64_get_itc() - itc2;
303 __get_cpu_var(ptcstats).shub_itc_clocks += itc2;
304 if (itc2 > __get_cpu_var(ptcstats).shub_itc_clocks_max)
305 __get_cpu_var(ptcstats).shub_itc_clocks_max = itc2;
306
Jack Steiner61a34a02006-01-26 15:03:41 -0800307 if (old_rr) {
308 ia64_set_rr(start, old_rr);
309 ia64_srlz_d();
310 }
311
Jes Sorensen8ed9b2c2006-02-13 05:29:57 -0500312 spin_unlock_irqrestore(PTC_LOCK(shub1), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
Jack Steiner3be44b92007-05-08 14:50:43 -0700314 if (flush_opt == 1 && deadlock) {
315 __get_cpu_var(ptcstats).deadlocks++;
316 sn2_ipi_flush_all_tlb(mm);
317 }
318
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 preempt_enable();
320}
321
322/*
323 * sn2_ptc_deadlock_recovery
324 *
325 * Recover from PTC deadlocks conditions. Recovery requires stepping thru each
326 * TLB flush transaction. The recovery sequence is somewhat tricky & is
327 * coded in assembly language.
328 */
Jes Sorensen8ed9b2c2006-02-13 05:29:57 -0500329
330void
331sn2_ptc_deadlock_recovery(short *nasids, short ib, short ie, int mynasid,
332 volatile unsigned long *ptc0, unsigned long data0,
333 volatile unsigned long *ptc1, unsigned long data1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334{
Jack Steiner470ceb02005-08-11 10:28:00 -0700335 short nasid, i;
Jack Steiner61a34a02006-01-26 15:03:41 -0800336 unsigned long *piows, zeroval, n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
Jack Steiner470ceb02005-08-11 10:28:00 -0700338 __get_cpu_var(ptcstats).deadlocks++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
Jack Steiner470ceb02005-08-11 10:28:00 -0700340 piows = (unsigned long *) pda->pio_write_status_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 zeroval = pda->pio_write_status_val;
342
Jack Steiner61a34a02006-01-26 15:03:41 -0800343
344 for (i=ib; i <= ie; i++) {
Jack Steiner470ceb02005-08-11 10:28:00 -0700345 nasid = nasids[i];
Jack Steiner61a34a02006-01-26 15:03:41 -0800346 if (local_node_uses_ptc_ga(is_shub1()) && nasid == mynasid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 ptc0 = CHANGE_NASID(nasid, ptc0);
349 if (ptc1)
350 ptc1 = CHANGE_NASID(nasid, ptc1);
Jack Steiner61a34a02006-01-26 15:03:41 -0800351
352 n = sn2_ptc_deadlock_recovery_core(ptc0, data0, ptc1, data1, piows, zeroval);
353 __get_cpu_var(ptcstats).deadlocks2 += n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 }
Jack Steiner470ceb02005-08-11 10:28:00 -0700355
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356}
357
358/**
359 * sn_send_IPI_phys - send an IPI to a Nasid and slice
360 * @nasid: nasid to receive the interrupt (may be outside partition)
361 * @physid: physical cpuid to receive the interrupt.
362 * @vector: command to send
363 * @delivery_mode: delivery mechanism
364 *
365 * Sends an IPI (interprocessor interrupt) to the processor specified by
366 * @physid
367 *
368 * @delivery_mode can be one of the following
369 *
370 * %IA64_IPI_DM_INT - pend an interrupt
371 * %IA64_IPI_DM_PMI - pend a PMI
372 * %IA64_IPI_DM_NMI - pend an NMI
373 * %IA64_IPI_DM_INIT - pend an INIT interrupt
374 */
375void sn_send_IPI_phys(int nasid, long physid, int vector, int delivery_mode)
376{
377 long val;
378 unsigned long flags = 0;
379 volatile long *p;
380
381 p = (long *)GLOBAL_MMR_PHYS_ADDR(nasid, SH_IPI_INT);
382 val = (1UL << SH_IPI_INT_SEND_SHFT) |
383 (physid << SH_IPI_INT_PID_SHFT) |
384 ((long)delivery_mode << SH_IPI_INT_TYPE_SHFT) |
385 ((long)vector << SH_IPI_INT_IDX_SHFT) |
386 (0x000feeUL << SH_IPI_INT_BASE_SHFT);
387
388 mb();
389 if (enable_shub_wars_1_1()) {
390 spin_lock_irqsave(&sn2_global_ptc_lock, flags);
391 }
392 pio_phys_write_mmr(p, val);
393 if (enable_shub_wars_1_1()) {
394 wait_piowc();
395 spin_unlock_irqrestore(&sn2_global_ptc_lock, flags);
396 }
397
398}
399
400EXPORT_SYMBOL(sn_send_IPI_phys);
401
402/**
403 * sn2_send_IPI - send an IPI to a processor
404 * @cpuid: target of the IPI
405 * @vector: command to send
406 * @delivery_mode: delivery mechanism
407 * @redirect: redirect the IPI?
408 *
409 * Sends an IPI (InterProcessor Interrupt) to the processor specified by
410 * @cpuid. @vector specifies the command to send, while @delivery_mode can
411 * be one of the following
412 *
413 * %IA64_IPI_DM_INT - pend an interrupt
414 * %IA64_IPI_DM_PMI - pend a PMI
415 * %IA64_IPI_DM_NMI - pend an NMI
416 * %IA64_IPI_DM_INIT - pend an INIT interrupt
417 */
418void sn2_send_IPI(int cpuid, int vector, int delivery_mode, int redirect)
419{
420 long physid;
421 int nasid;
422
423 physid = cpu_physical_id(cpuid);
424 nasid = cpuid_to_nasid(cpuid);
425
426 /* the following is used only when starting cpus at boot time */
427 if (unlikely(nasid == -1))
428 ia64_sn_get_sapic_info(physid, &nasid, NULL, NULL);
429
430 sn_send_IPI_phys(nasid, physid, vector, delivery_mode);
431}
Jack Steiner470ceb02005-08-11 10:28:00 -0700432
John Keller6e9de182007-08-22 19:32:06 -0500433#ifdef CONFIG_HOTPLUG_CPU
434/**
435 * sn_cpu_disable_allowed - Determine if a CPU can be disabled.
436 * @cpu - CPU that is requested to be disabled.
437 *
438 * CPU disable is only allowed on SHub2 systems running with a PROM
439 * that supports CPU disable. It is not permitted to disable the boot processor.
440 */
441bool sn_cpu_disable_allowed(int cpu)
442{
443 if (is_shub2() && sn_prom_feature_available(PRF_CPU_DISABLE_SUPPORT)) {
444 if (cpu != 0)
445 return true;
446 else
447 printk(KERN_WARNING
448 "Disabling the boot processor is not allowed.\n");
449
450 } else
451 printk(KERN_WARNING
452 "CPU disable is not supported on this system.\n");
453
454 return false;
455}
456#endif /* CONFIG_HOTPLUG_CPU */
457
Jack Steiner470ceb02005-08-11 10:28:00 -0700458#ifdef CONFIG_PROC_FS
459
460#define PTC_BASENAME "sgi_sn/ptc_statistics"
461
462static void *sn2_ptc_seq_start(struct seq_file *file, loff_t * offset)
463{
464 if (*offset < NR_CPUS)
465 return offset;
466 return NULL;
467}
468
469static void *sn2_ptc_seq_next(struct seq_file *file, void *data, loff_t * offset)
470{
471 (*offset)++;
472 if (*offset < NR_CPUS)
473 return offset;
474 return NULL;
475}
476
477static void sn2_ptc_seq_stop(struct seq_file *file, void *data)
478{
479}
480
481static int sn2_ptc_seq_show(struct seq_file *file, void *data)
482{
483 struct ptc_stats *stat;
484 int cpu;
485
486 cpu = *(loff_t *) data;
487
488 if (!cpu) {
Jack Steiner61a34a02006-01-26 15:03:41 -0800489 seq_printf(file,
Jack Steiner3be44b92007-05-08 14:50:43 -0700490 "# cpu ptc_l newrid ptc_flushes nodes_flushed deadlocks lock_nsec shub_nsec shub_nsec_max not_my_mm deadlock2 ipi_fluches ipi_nsec\n");
491 seq_printf(file, "# ptctest %d, flushopt %d\n", sn2_ptctest, sn2_flush_opt);
Jack Steiner470ceb02005-08-11 10:28:00 -0700492 }
493
494 if (cpu < NR_CPUS && cpu_online(cpu)) {
495 stat = &per_cpu(ptcstats, cpu);
Jack Steiner3be44b92007-05-08 14:50:43 -0700496 seq_printf(file, "cpu %d %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld\n", cpu, stat->ptc_l,
Jack Steiner470ceb02005-08-11 10:28:00 -0700497 stat->change_rid, stat->shub_ptc_flushes, stat->nodes_flushed,
498 stat->deadlocks,
499 1000 * stat->lock_itc_clocks / per_cpu(cpu_info, cpu).cyc_per_usec,
500 1000 * stat->shub_itc_clocks / per_cpu(cpu_info, cpu).cyc_per_usec,
Jack Steiner61a34a02006-01-26 15:03:41 -0800501 1000 * stat->shub_itc_clocks_max / per_cpu(cpu_info, cpu).cyc_per_usec,
502 stat->shub_ptc_flushes_not_my_mm,
Jack Steiner3be44b92007-05-08 14:50:43 -0700503 stat->deadlocks2,
504 stat->shub_ipi_flushes,
505 1000 * stat->shub_ipi_flushes_itc_clocks / per_cpu(cpu_info, cpu).cyc_per_usec);
Jack Steiner470ceb02005-08-11 10:28:00 -0700506 }
Jack Steiner470ceb02005-08-11 10:28:00 -0700507 return 0;
508}
509
Jack Steiner3be44b92007-05-08 14:50:43 -0700510static ssize_t sn2_ptc_proc_write(struct file *file, const char __user *user, size_t count, loff_t *data)
511{
512 int cpu;
513 char optstr[64];
514
Cliff Wickman80971102008-06-24 10:20:06 -0700515 if (count == 0 || count > sizeof(optstr))
Cliff Wickmane0c6d972008-06-20 12:02:00 -0700516 return -EINVAL;
Jack Steiner3be44b92007-05-08 14:50:43 -0700517 if (copy_from_user(optstr, user, count))
518 return -EFAULT;
519 optstr[count - 1] = '\0';
520 sn2_flush_opt = simple_strtoul(optstr, NULL, 0);
521
522 for_each_online_cpu(cpu)
523 memset(&per_cpu(ptcstats, cpu), 0, sizeof(struct ptc_stats));
524
525 return count;
526}
527
Jan Engelhardta23fe552008-01-22 20:42:07 +0100528static const struct seq_operations sn2_ptc_seq_ops = {
Jack Steiner470ceb02005-08-11 10:28:00 -0700529 .start = sn2_ptc_seq_start,
530 .next = sn2_ptc_seq_next,
531 .stop = sn2_ptc_seq_stop,
532 .show = sn2_ptc_seq_show
533};
534
Jack Steiner61a34a02006-01-26 15:03:41 -0800535static int sn2_ptc_proc_open(struct inode *inode, struct file *file)
Jack Steiner470ceb02005-08-11 10:28:00 -0700536{
537 return seq_open(file, &sn2_ptc_seq_ops);
538}
539
Arjan van de Ven5dfe4c92007-02-12 00:55:31 -0800540static const struct file_operations proc_sn2_ptc_operations = {
Jack Steiner470ceb02005-08-11 10:28:00 -0700541 .open = sn2_ptc_proc_open,
542 .read = seq_read,
Jack Steiner3be44b92007-05-08 14:50:43 -0700543 .write = sn2_ptc_proc_write,
Jack Steiner470ceb02005-08-11 10:28:00 -0700544 .llseek = seq_lseek,
545 .release = seq_release,
546};
547
548static struct proc_dir_entry *proc_sn2_ptc;
549
550static int __init sn2_ptc_init(void)
551{
Prarit Bhargava9ad4f922005-11-21 13:00:38 -0500552 if (!ia64_platform_is("sn2"))
Bjorn Helgaas6c5e6212006-03-03 15:33:47 -0700553 return 0;
Prarit Bhargava9ad4f922005-11-21 13:00:38 -0500554
Denis V. Luneve2363762008-04-29 01:02:25 -0700555 proc_sn2_ptc = proc_create(PTC_BASENAME, 0444,
556 NULL, &proc_sn2_ptc_operations);
557 if (!&proc_sn2_ptc_operations) {
Jack Steiner470ceb02005-08-11 10:28:00 -0700558 printk(KERN_ERR "unable to create %s proc entry", PTC_BASENAME);
559 return -EINVAL;
560 }
Jack Steiner470ceb02005-08-11 10:28:00 -0700561 spin_lock_init(&sn2_global_ptc_lock);
562 return 0;
563}
564
565static void __exit sn2_ptc_exit(void)
566{
567 remove_proc_entry(PTC_BASENAME, NULL);
568}
569
570module_init(sn2_ptc_init);
571module_exit(sn2_ptc_exit);
572#endif /* CONFIG_PROC_FS */
573