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authorJack Steiner <steiner@sgi.com>2007-05-08 17:50:43 -0400
committerTony Luck <tony.luck@intel.com>2007-05-08 17:50:43 -0400
commit3be44b9cc33d26930cb3bb014f35f582c6522481 (patch)
tree09225c5f0fb4c6caa81bbdff216ec83a093e4d12 /arch/ia64/sn/kernel
parent8737d59579c5e61ea3d5da4bd63303159fd1cf7e (diff)
[IA64] Optional method to purge the TLB on SN systems
This patch adds an optional method for purging the TLB on SN IA64 systems. The change should not affect any non-SN system. Signed-off-by: Jack Steiner <steiner@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/sn/kernel')
-rw-r--r--arch/ia64/sn/kernel/sn2/sn2_smp.c65
1 files changed, 60 insertions, 5 deletions
diff --git a/arch/ia64/sn/kernel/sn2/sn2_smp.c b/arch/ia64/sn/kernel/sn2/sn2_smp.c
index 601747b1e22a..5d318b579fb1 100644
--- a/arch/ia64/sn/kernel/sn2/sn2_smp.c
+++ b/arch/ia64/sn/kernel/sn2/sn2_smp.c
@@ -46,6 +46,9 @@ DECLARE_PER_CPU(struct ptc_stats, ptcstats);
46 46
47static __cacheline_aligned DEFINE_SPINLOCK(sn2_global_ptc_lock); 47static __cacheline_aligned DEFINE_SPINLOCK(sn2_global_ptc_lock);
48 48
49/* 0 = old algorithm (no IPI flushes), 1 = ipi deadlock flush, 2 = ipi instead of SHUB ptc, >2 = always ipi */
50static int sn2_flush_opt = 0;
51
49extern unsigned long 52extern unsigned long
50sn2_ptc_deadlock_recovery_core(volatile unsigned long *, unsigned long, 53sn2_ptc_deadlock_recovery_core(volatile unsigned long *, unsigned long,
51 volatile unsigned long *, unsigned long, 54 volatile unsigned long *, unsigned long,
@@ -76,6 +79,8 @@ struct ptc_stats {
76 unsigned long shub_itc_clocks; 79 unsigned long shub_itc_clocks;
77 unsigned long shub_itc_clocks_max; 80 unsigned long shub_itc_clocks_max;
78 unsigned long shub_ptc_flushes_not_my_mm; 81 unsigned long shub_ptc_flushes_not_my_mm;
82 unsigned long shub_ipi_flushes;
83 unsigned long shub_ipi_flushes_itc_clocks;
79}; 84};
80 85
81#define sn2_ptctest 0 86#define sn2_ptctest 0
@@ -121,6 +126,18 @@ void sn_tlb_migrate_finish(struct mm_struct *mm)
121 flush_tlb_mm(mm); 126 flush_tlb_mm(mm);
122} 127}
123 128
129static void
130sn2_ipi_flush_all_tlb(struct mm_struct *mm)
131{
132 unsigned long itc;
133
134 itc = ia64_get_itc();
135 smp_flush_tlb_cpumask(mm->cpu_vm_mask);
136 itc = ia64_get_itc() - itc;
137 __get_cpu_var(ptcstats).shub_ipi_flushes_itc_clocks += itc;
138 __get_cpu_var(ptcstats).shub_ipi_flushes++;
139}
140
124/** 141/**
125 * sn2_global_tlb_purge - globally purge translation cache of virtual address range 142 * sn2_global_tlb_purge - globally purge translation cache of virtual address range
126 * @mm: mm_struct containing virtual address range 143 * @mm: mm_struct containing virtual address range
@@ -154,7 +171,12 @@ sn2_global_tlb_purge(struct mm_struct *mm, unsigned long start,
154 unsigned long itc, itc2, flags, data0 = 0, data1 = 0, rr_value, old_rr = 0; 171 unsigned long itc, itc2, flags, data0 = 0, data1 = 0, rr_value, old_rr = 0;
155 short nasids[MAX_NUMNODES], nix; 172 short nasids[MAX_NUMNODES], nix;
156 nodemask_t nodes_flushed; 173 nodemask_t nodes_flushed;
157 int active, max_active, deadlock; 174 int active, max_active, deadlock, flush_opt = sn2_flush_opt;
175
176 if (flush_opt > 2) {
177 sn2_ipi_flush_all_tlb(mm);
178 return;
179 }
158 180
159 nodes_clear(nodes_flushed); 181 nodes_clear(nodes_flushed);
160 i = 0; 182 i = 0;
@@ -189,6 +211,12 @@ sn2_global_tlb_purge(struct mm_struct *mm, unsigned long start,
189 return; 211 return;
190 } 212 }
191 213
214 if (flush_opt == 2) {
215 sn2_ipi_flush_all_tlb(mm);
216 preempt_enable();
217 return;
218 }
219
192 itc = ia64_get_itc(); 220 itc = ia64_get_itc();
193 nix = 0; 221 nix = 0;
194 for_each_node_mask(cnode, nodes_flushed) 222 for_each_node_mask(cnode, nodes_flushed)
@@ -256,6 +284,8 @@ sn2_global_tlb_purge(struct mm_struct *mm, unsigned long start,
256 } 284 }
257 if (active >= max_active || i == (nix - 1)) { 285 if (active >= max_active || i == (nix - 1)) {
258 if ((deadlock = wait_piowc())) { 286 if ((deadlock = wait_piowc())) {
287 if (flush_opt == 1)
288 goto done;
259 sn2_ptc_deadlock_recovery(nasids, ibegin, i, mynasid, ptc0, data0, ptc1, data1); 289 sn2_ptc_deadlock_recovery(nasids, ibegin, i, mynasid, ptc0, data0, ptc1, data1);
260 if (reset_max_active_on_deadlock()) 290 if (reset_max_active_on_deadlock())
261 max_active = 1; 291 max_active = 1;
@@ -267,6 +297,7 @@ sn2_global_tlb_purge(struct mm_struct *mm, unsigned long start,
267 start += (1UL << nbits); 297 start += (1UL << nbits);
268 } while (start < end); 298 } while (start < end);
269 299
300done:
270 itc2 = ia64_get_itc() - itc2; 301 itc2 = ia64_get_itc() - itc2;
271 __get_cpu_var(ptcstats).shub_itc_clocks += itc2; 302 __get_cpu_var(ptcstats).shub_itc_clocks += itc2;
272 if (itc2 > __get_cpu_var(ptcstats).shub_itc_clocks_max) 303 if (itc2 > __get_cpu_var(ptcstats).shub_itc_clocks_max)
@@ -279,6 +310,11 @@ sn2_global_tlb_purge(struct mm_struct *mm, unsigned long start,
279 310
280 spin_unlock_irqrestore(PTC_LOCK(shub1), flags); 311 spin_unlock_irqrestore(PTC_LOCK(shub1), flags);
281 312
313 if (flush_opt == 1 && deadlock) {
314 __get_cpu_var(ptcstats).deadlocks++;
315 sn2_ipi_flush_all_tlb(mm);
316 }
317
282 preempt_enable(); 318 preempt_enable();
283} 319}
284 320
@@ -425,24 +461,42 @@ static int sn2_ptc_seq_show(struct seq_file *file, void *data)
425 461
426 if (!cpu) { 462 if (!cpu) {
427 seq_printf(file, 463 seq_printf(file,
428 "# cpu ptc_l newrid ptc_flushes nodes_flushed deadlocks lock_nsec shub_nsec shub_nsec_max not_my_mm deadlock2\n"); 464 "# 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");
429 seq_printf(file, "# ptctest %d\n", sn2_ptctest); 465 seq_printf(file, "# ptctest %d, flushopt %d\n", sn2_ptctest, sn2_flush_opt);
430 } 466 }
431 467
432 if (cpu < NR_CPUS && cpu_online(cpu)) { 468 if (cpu < NR_CPUS && cpu_online(cpu)) {
433 stat = &per_cpu(ptcstats, cpu); 469 stat = &per_cpu(ptcstats, cpu);
434 seq_printf(file, "cpu %d %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld\n", cpu, stat->ptc_l, 470 seq_printf(file, "cpu %d %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld\n", cpu, stat->ptc_l,
435 stat->change_rid, stat->shub_ptc_flushes, stat->nodes_flushed, 471 stat->change_rid, stat->shub_ptc_flushes, stat->nodes_flushed,
436 stat->deadlocks, 472 stat->deadlocks,
437 1000 * stat->lock_itc_clocks / per_cpu(cpu_info, cpu).cyc_per_usec, 473 1000 * stat->lock_itc_clocks / per_cpu(cpu_info, cpu).cyc_per_usec,
438 1000 * stat->shub_itc_clocks / per_cpu(cpu_info, cpu).cyc_per_usec, 474 1000 * stat->shub_itc_clocks / per_cpu(cpu_info, cpu).cyc_per_usec,
439 1000 * stat->shub_itc_clocks_max / per_cpu(cpu_info, cpu).cyc_per_usec, 475 1000 * stat->shub_itc_clocks_max / per_cpu(cpu_info, cpu).cyc_per_usec,
440 stat->shub_ptc_flushes_not_my_mm, 476 stat->shub_ptc_flushes_not_my_mm,
441 stat->deadlocks2); 477 stat->deadlocks2,
478 stat->shub_ipi_flushes,
479 1000 * stat->shub_ipi_flushes_itc_clocks / per_cpu(cpu_info, cpu).cyc_per_usec);
442 } 480 }
443 return 0; 481 return 0;
444} 482}
445 483
484static ssize_t sn2_ptc_proc_write(struct file *file, const char __user *user, size_t count, loff_t *data)
485{
486 int cpu;
487 char optstr[64];
488
489 if (copy_from_user(optstr, user, count))
490 return -EFAULT;
491 optstr[count - 1] = '\0';
492 sn2_flush_opt = simple_strtoul(optstr, NULL, 0);
493
494 for_each_online_cpu(cpu)
495 memset(&per_cpu(ptcstats, cpu), 0, sizeof(struct ptc_stats));
496
497 return count;
498}
499
446static struct seq_operations sn2_ptc_seq_ops = { 500static struct seq_operations sn2_ptc_seq_ops = {
447 .start = sn2_ptc_seq_start, 501 .start = sn2_ptc_seq_start,
448 .next = sn2_ptc_seq_next, 502 .next = sn2_ptc_seq_next,
@@ -458,6 +512,7 @@ static int sn2_ptc_proc_open(struct inode *inode, struct file *file)
458static const struct file_operations proc_sn2_ptc_operations = { 512static const struct file_operations proc_sn2_ptc_operations = {
459 .open = sn2_ptc_proc_open, 513 .open = sn2_ptc_proc_open,
460 .read = seq_read, 514 .read = seq_read,
515 .write = sn2_ptc_proc_write,
461 .llseek = seq_lseek, 516 .llseek = seq_lseek,
462 .release = seq_release, 517 .release = seq_release,
463}; 518};